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WO2013046329A1 - Dispositif de correction de décalage d'axe optique, procédé de commande et dispositif d'affichage tête haute - Google Patents

Dispositif de correction de décalage d'axe optique, procédé de commande et dispositif d'affichage tête haute Download PDF

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Publication number
WO2013046329A1
WO2013046329A1 PCT/JP2011/072052 JP2011072052W WO2013046329A1 WO 2013046329 A1 WO2013046329 A1 WO 2013046329A1 JP 2011072052 W JP2011072052 W JP 2011072052W WO 2013046329 A1 WO2013046329 A1 WO 2013046329A1
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WO
WIPO (PCT)
Prior art keywords
scanning
optical axis
light receiving
receiving element
light
Prior art date
Application number
PCT/JP2011/072052
Other languages
English (en)
Japanese (ja)
Inventor
雄一 吉田
和弥 笹森
福田　雅文
英昭 鶴見
純也 村田
Original Assignee
パイオニア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パイオニア株式会社 filed Critical パイオニア株式会社
Priority to PCT/JP2011/072052 priority Critical patent/WO2013046329A1/fr
Priority to JP2013535685A priority patent/JP5731660B2/ja
Publication of WO2013046329A1 publication Critical patent/WO2013046329A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G02B27/104—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with scanning systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/317—Convergence or focusing systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3185—Geometric adjustment, e.g. keystone or convergence
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/014—Head-up displays characterised by optical features comprising information/image processing systems
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/002—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT

Definitions

  • the present invention relates to a technical field for correcting an optical axis shift of laser light.
  • a technique for detecting the deviation of the optical axis of each color light source used for drawing an image is known.
  • the first light source is turned on and off and the second light source is turned on and off, and the first light source in the light receiving region of the light receiver is controlled.
  • a technique for detecting a deviation between the optical axis of the first light source and the optical axis of the second light source is proposed based on the reception timing of the light and the reception timing of the second light in the light receiving region of the light receiver. Yes.
  • the speed at which the laser beam passes over the light receiving element is high. Is required.
  • the main object of the present invention is to provide an optical axis deviation correction apparatus, a control method, and a head-up display capable of detecting and correcting an optical axis deviation without requiring high detection accuracy of a light receiving element.
  • an optical axis misalignment correction apparatus that corrects an optical axis misalignment between the first beam emitted from the first light source and the second beam emitted from the second light source.
  • Scanning means for scanning the scanning region with the beam and the second beam, a light receiving element disposed at a position capable of receiving the first beam and the second beam scanned on the scanning region, and the first Control means for changing a position at which the beam and the second beam are irradiated in the scanning region in a main scanning direction or a sub-scanning direction for each scanning period of each scanning repeated a plurality of times with respect to the scanning region;
  • the detecting means for detecting the optical axis deviation of the first beam and the second beam, and the optical axis deviation of the first beam or the second
  • an optical axis misalignment correction apparatus that corrects an optical axis misalignment between a first beam emitted from a first light source and a second beam emitted from a second light source, Scanning means for scanning the scanning region with the beam and the second beam, a light receiving element disposed at a position capable of receiving the first beam and the second beam scanned on the scanning region, and the first Control that draws a predetermined pattern on the scanning region by the beam and the second beam, and changes the drawing position of the pattern in the main scanning direction or the sub-scanning direction for each scanning period of each scan repeated a plurality of times.
  • Detecting means for detecting a deviation of the optical axes of the first beam and the second beam in accordance with a difference in timing of receiving the first beam and the second beam based on the deviation detected by the detecting means.
  • correction means for correcting the optical axis deviation of the two beams.
  • the optical axis offset of the 1st beam irradiated from a 1st light source and the 2nd beam irradiated from a 2nd light source is correct
  • the position at which the first beam and the second beam are irradiated in the scanning region is set in the main scanning direction or sub-scanning for each scanning period of each scanning repeated a plurality of times with respect to the scanning region.
  • a correction step of correcting an optical axis shift of the second beam
  • a head having an optical axis deviation correction device for correcting an optical axis deviation between the first beam emitted from the first light source and the second beam emitted from the second light source in the light source unit.
  • the optical axis deviation correcting device includes a scanning unit that scans the scanning region with respect to the first beam and the second beam over a predetermined scanning period, and the first beam that has scanned the scanning region.
  • a light receiving element disposed at a position capable of receiving one beam and the second beam, and a position at which the first beam and the second beam are irradiated in the scanning region with respect to the scanning region.
  • Control means for changing in the main scanning direction or the sub-scanning direction for each scanning period of each scanning repeated a plurality of times every time, and scanning the first beam and the second beam for the scanning region.
  • the optical axis of the first beam and the second beam is shifted according to the difference between the timing at which the light receiving element receives the first beam and the timing at which the second beam is received during the unit time.
  • detecting means for detecting the optical axis deviation of the first beam or the second beam based on the deviation detected by the detecting means.
  • FIG. 1 shows a configuration of an image drawing apparatus according to the present embodiment.
  • positioning of a micro lens array and a light receiving element is shown.
  • the structural example of a head-up display is shown.
  • an optical axis deviation correction apparatus that corrects an optical axis deviation between a first beam emitted from a first light source and a second beam emitted from a second light source, Scanning means for scanning the first beam and the second beam with respect to a scanning region; a light receiving element disposed at a position capable of receiving the first beam and the second beam scanned in the scanning region; Control means for changing a position at which the first beam and the second beam are irradiated in the scanning region in a main scanning direction or a sub-scanning direction for each scanning period of each scan repeated a plurality of times with respect to the scanning region; When the control unit scans the first beam and the second beam with respect to the scanning region, the timing at which the light receiving element receives the first beam and the timing at which the second beam is received. Detecting means for detecting a deviation of the optical axes of the first beam and the second beam according to the difference between the first beam and the second beam, based on the deviation
  • the optical axis deviation correction device corrects an optical axis deviation between the first beam emitted from the first light source and the second beam emitted from the second light source, and includes a scanning unit, a light receiving element, and a control unit. And detecting means and correcting means.
  • the scanning unit scans the scanning region with the first beam and the second beam.
  • the control means changes the position at which the first beam and the second beam are irradiated in the scanning region in the main scanning direction or the sub-scanning direction for each scanning period of each scan repeated a plurality of times with respect to the scanning region.
  • the detecting means detects the first beam according to the difference between the timing at which the light receiving element receives the first beam and the timing at which the second beam is received when the first beam and the second beam are scanned in the scanning region. And a deviation of the optical axis of the second beam is detected.
  • the correction unit corrects the optical axis shift of the first beam or the second beam based on the shift detected by the detection unit.
  • the optical axis deviation correcting device scans the scanning region by changing the irradiation position in the main scanning direction or the sub-scanning direction for each scanning period of each scanning repeated a plurality of times with respect to the scanning region.
  • the optical axis deviation is corrected based on the light reception timing of the beam and the light reception timing of the second beam.
  • the optical axis deviation correction device can easily measure the light reception timing and correct the optical axis deviation without depending on the detection accuracy of the light receiving element, even when the laser beam passes through the light receiving element at high speed. Can be performed.
  • the scanning unit scans the scanning region with the first beam and the second beam over a predetermined scanning period
  • the control unit includes the first beam and the second beam.
  • the position irradiated with the second beam is changed in the main scanning direction or the sub-scanning direction for each scan repeated a plurality of times every predetermined unit time at a frame rate
  • the detection means is configured to change the position in the unit time.
  • the optical axis shift is detected according to the difference between the timing at which the light receiving element receives the first beam and the second beam.
  • the unit time described above indicates, for example, 1 second when scanning is performed every 60 FPS (Frames Per Second).
  • the optical axis deviation correction device can easily measure the light reception timing and correct the optical axis deviation without depending on the detection accuracy of the light receiving element, even when the laser beam passes through the light receiving element at high speed. Can be performed.
  • the control unit determines a position at which the first beam and the second beam are irradiated on the scanning region in the scanning period. And change in the main scanning direction for each scanning period.
  • the optical axis deviation correction device suitably corrects the optical axis deviation in the main scanning direction even when the light receiving element is arranged at the boundary portion of each pixel or when the width in the main scanning direction is large. It can be corrected.
  • the number of the plurality of consecutive rows to be irradiated is set in the main scanning direction of the irradiation region during the unit time on the scanning surface on which the light receiving element is disposed. Is set to be larger than that of the light receiving element.
  • the control unit sets the amount of change of the irradiation region for each scanning period to a value smaller than the size of the light receiving element in the main scanning direction.
  • control unit may determine a position at which the first beam and the second beam are applied to the scanning region in the scanning period for one column in the scanning region. And change in the sub-scanning direction for each scanning period. By doing so, the optical axis deviation correction apparatus can correct the optical axis deviation in the sub-scanning direction quickly and with high accuracy.
  • the control unit determines a position at which the first beam and the second beam are irradiated on the scanning region in the scanning period in a sub-scanning direction in the scanning region. Are set to consecutive pixels.
  • the optical axis deviation correction device can suitably correct the optical axis deviation in the sub-scanning direction.
  • the control unit may determine a position at which the first beam and the second beam are irradiated in the scanning region in a main scanning direction or a sub-scan for each scanning period. In the direction, the light receiving element is changed according to the movement width corresponding to the width in the main scanning direction or the sub-scanning direction. According to this aspect, the optical axis deviation correction apparatus can perform optical axis deviation correction more quickly.
  • the control unit continuously determines positions at which the first beam and the second beam are irradiated in the scanning region in the scanning direction for each scanning period. Or, it is changed toward the sub-scanning direction.
  • the optical axis deviation correction apparatus can preferably scan the entire scanning region and measure the light reception timing of the light receiving element.
  • the control unit scans the scanning region with the first beam and the second beam separately.
  • the optical axis deviation correction apparatus can preferably measure the light reception timing of the first beam and the second beam.
  • the light correction element is configured such that the light receiving element in the unit time is scanned when the first beam and the second beam are scanned over the scanning region.
  • the light emission timing of the first light source or the second light source is controlled so that the timing of receiving the first beam matches the timing of receiving the second beam.
  • the optical axis deviation correction apparatus can suitably correct the optical axis deviation.
  • an optical axis deviation correction device that corrects an optical axis deviation between a first beam emitted from a first light source and a second beam emitted from a second light source, Scanning means for scanning the first beam and the second beam with respect to a scanning region; a light receiving element disposed at a position capable of receiving the first beam and the second beam scanned in the scanning region; A predetermined pattern is drawn on the scanning area by the first beam and the second beam, and the drawing position of the pattern is changed in the main scanning direction or the sub-scanning direction for each scanning period of each scan repeated a plurality of times.
  • Control means for causing the light receiving element to receive the first beam and the second beam when the control means scans the first beam and the second beam with respect to the scanning region.
  • Detection means for detecting a deviation of the optical axes of the first beam and the second beam in accordance with a difference in timing of receiving the beam, and based on the deviation detected by the detection means, the first beam or Correction means for correcting an optical axis shift of the second beam.
  • the optical axis misalignment correction apparatus can easily measure the light reception timing without depending on the detection accuracy of the light receiving element, even when the laser beam passes through the light receiving element at high speed, and the optical axis. Deviation correction can be performed.
  • the optical axis shift between the first beam emitted from the first light source and the second beam emitted from the second light source is corrected, and the first beam and the second beam are corrected.
  • An optical axis misalignment correction apparatus comprising: scanning means for scanning a scanning region with respect to a scanning region; and a light receiving element arranged at a position where the first beam and the second beam scanned on the scanning region can be received.
  • a control step of changing in the sub-scanning direction, and a timing at which the light receiving element receives the first beam when the first beam and the second beam are scanned on the scanning region by the control step. And detecting the shift of the optical axes of the first beam and the second beam according to the difference between the timing of receiving the second beam and the second beam, and based on the shift detected by the detection step, And a correction step of correcting an optical axis shift of the first beam or the second beam.
  • the optical axis misalignment correction device can easily measure the light reception timing without depending on the detection accuracy of the light receiving element, even when the laser light passes through the light receiving element at high speed. It becomes possible to correct the optical axis deviation.
  • an optical axis deviation correction device that corrects an optical axis deviation between a first beam emitted from a first light source and a second beam emitted from a second light source is provided as a light source unit.
  • the optical axis deviation correcting device includes: scanning means for scanning the scanning region with the first beam and the second beam over a predetermined scanning period; and scanning the scanning region.
  • a light receiving element disposed at a position capable of receiving the first beam and the second beam, and a position at which the first beam and the second beam are irradiated in the scanning region, with respect to the scanning region, Control means for changing in the main scanning direction or sub-scanning direction for each scanning period of each scanning repeated a plurality of times every predetermined unit time, and the first beam and the second beam targeting the scanning region When scanned, the light of the first beam and the second beam according to the difference between the timing at which the light receiving element receives the first beam and the timing at which the second beam is received during the unit time.
  • the head-up display is equipped with the above-mentioned optical axis deviation correction device in the light source unit, so that even when laser light passes through the light receiving element at high speed, the light receiving timing does not depend on the detection accuracy of the light receiving element. Can be easily measured and the optical axis deviation can be corrected.
  • FIG. 1 shows a configuration of an image drawing apparatus 1 to which an optical axis deviation correction apparatus according to the present invention is applied.
  • the image drawing apparatus 1 includes an image signal input unit 2, a video ASIC 3, a frame memory 4, a ROM 5, a RAM 6, a laser driver ASIC 7, a MEMS control unit 8, and a laser light source unit 9. And comprising.
  • the image drawing apparatus 1 is used as a light source for a head-up display, for example, and emits light constituting a display image to an optical element such as a combiner.
  • the image signal input unit 2 receives an image signal input from the outside and outputs it to the video ASIC 3.
  • the video ASIC 3 is a block that controls the laser driver ASIC 7 and the MEMS control unit 8 based on the image signal input from the image signal input unit 2 and the scanning position information “Sc” input from the MEMS mirror 10, and the ASIC (Application) It is configured as Specific Integrated Circuit).
  • the video ASIC 3 includes a synchronization / image separation unit 31, a bit data conversion unit 32, a light emission pattern conversion unit 33, and a timing controller 34.
  • the synchronization / image separation unit 31 separates the image data displayed on the image display unit and the synchronization signal from the image signal input from the image signal input unit 2 and writes the image data to the frame memory 4.
  • the bit data conversion unit 32 reads the image data written in the frame memory 4 and converts it into bit data.
  • the light emission pattern conversion unit 33 converts the bit data converted by the bit data conversion unit 32 into a signal representing the light emission pattern of each laser.
  • the timing controller 34 controls the operation timing of the synchronization / image separation unit 31 and the bit data conversion unit 32.
  • the timing controller 34 also controls the operation timing of the MEMS control unit 8 described later.
  • the image data separated by the synchronization / image separation unit 31 is written.
  • the ROM 5 stores a control program and data for operating the video ASIC 3. Various data are sequentially read from and written into the RAM 6 as a work memory when the video ASIC 3 operates.
  • the laser driver ASIC 7 is a block that generates a signal for driving a laser diode provided in a laser light source unit 9 described later, and is configured as an ASIC.
  • the laser driver ASIC 7 includes a red laser driving circuit 71, a blue laser driving circuit 72, and a green laser driving circuit 73.
  • the red laser driving circuit 71 drives the red laser “LD1” based on the signal output from the light emission pattern conversion unit 33.
  • the blue laser driving circuit 72 drives the blue laser “LD2” based on the signal output from the light emission pattern conversion unit 33.
  • the green laser driving circuit 73 drives the green laser “LD3” based on the signal output from the light emission pattern conversion unit 33.
  • the MEMS control unit 8 controls the MEMS mirror 10 based on a signal output from the timing controller 34.
  • the MEMS control unit 8 includes a servo circuit 81 and a driver circuit 82.
  • the MEMS control unit 8 and the laser driver ASIC 7 function as “control means”.
  • the servo circuit 81 controls the operation of the MEMS mirror 10 based on a signal from the timing controller.
  • the driver circuit 82 amplifies the control signal of the MEMS mirror 10 output from the servo circuit 81 to a predetermined level and outputs the amplified signal.
  • the laser light source unit 9 emits laser light based on the drive signal output from the laser driver ASIC 7.
  • the laser light source unit 9 mainly includes a red laser LD1, a blue laser LD2, a green laser LD3, collimator lenses 91a to 91c, reflection mirrors 92a to 92c, a microlens array 94, and a lens. 95 and the light receiving element 100.
  • the red laser LD1 emits red laser light (also referred to as “red laser light LR”)
  • the blue laser LD2 emits blue laser light (also referred to as “blue laser light LB”)
  • Green laser light also referred to as “green laser light LG” is emitted.
  • the collimator lenses 91a to 91c convert the red, blue, and green laser beams LR, LB, and LG into parallel beams and emit the parallel beams to the reflection mirrors 92a to 92c.
  • the reflection mirror 92b reflects the blue laser light LB
  • the reflection mirror 92c transmits the blue laser light LB and reflects the green laser light LG.
  • the reflection mirror 92a transmits only the red laser beam LR and reflects the blue and green laser beams LB and LG.
  • the red laser light LR transmitted through the reflection mirror 92 a and the blue and green laser beams LB and LG reflected by the reflection mirror 92 a are incident on the MEMS mirror 10.
  • the arbitrary two laser beams of the lasers LD1, LD2, and LD3 are examples of the “first light source” and the “second light source” in the present invention, and the arbitrary two laser beams of the laser beams LR, LB, and LG. Are examples of the “first beam” and the “second beam” in the present invention.
  • the MEMS mirror 10 functions as “scanning means” in the present invention, and reflects the laser light incident from the reflection mirror 92a toward a microlens array 94 which is an example of EPE (Exit Pupil Expander).
  • the MEMS mirror 10 basically moves so as to scan the microlens array 94 as a screen under the control of the MEMS control unit 8 in order to display the image input to the image signal input unit 2.
  • the scanning position information at that time (for example, information such as the angle of the mirror) is output to the video ASIC 3.
  • the microlens array 94 a plurality of microlenses are arranged, and the laser beam reflected by the MEMS mirror 10 is incident thereon.
  • the lens 95 enlarges an image formed on the radiation surface of the microlens array 94.
  • the light receiving element 100 is provided in the vicinity of the microlens array 94. Specifically, the microlens array 94 is provided at a position including a drawing area “RR” (corresponding to an area for displaying an image (video) to be presented to the user; the same shall apply hereinafter). On the other hand, the light receiving element 100 is provided at a position corresponding to a predetermined area outside the drawing area RR. A specific arrangement of the light receiving element 100 will be described later with reference to FIG.
  • the light receiving element 100 is configured by a photoelectric conversion element such as a photodetector, and supplies a detection signal “Sd”, which is an electrical signal corresponding to the amount of incident laser light, to the video ASIC 3.
  • the video ASIC 3 detects the optical axis shift of the red laser light LR, the blue laser light LB, and the green laser light LG based on the detection signal Sd from the light receiving element 100. Further, the video ASIC 3 performs processing for correcting the optical axis deviation based on the detected optical axis deviation. Specifically, the video ASIC 3 corrects the optical axis deviation by changing the light emission timing of the red laser LD1, the blue laser LD2, and / or the green laser LD3. At this time, the video ASIC 3 changes the above-described adjustment amount of the light emission timing based on whether the optical axis shift direction is the main scanning direction or the sub-scanning direction. Thus, the video ASIC 3 functions as “detection means” and “correction means” in the present invention.
  • FIG. 2 is a diagram illustrating an arrangement example of the microlens array 94 and the light receiving element 100.
  • FIG. 2 shows a diagram in which the microlens array 94 and the light receiving element 100 are observed from the direction along the traveling direction of the laser light (the arrow “Z” direction in FIG. 1).
  • a scannable region “SR” represented by a broken line is a region corresponding to a range where scanning by the MEMS mirror 10 is possible, that is, a range where drawing is possible.
  • a microlens array 94 is disposed in the scannable region SR.
  • a region represented by a one-dot chain line in the microlens array 94 indicates a drawing region RR.
  • the light receiving element 100 is an area in the scannable area SR and is provided below the microlens array 94. That is, the light receiving element 100 is provided at a position corresponding to a region outside the drawing region RR so as not to disturb the display. In this example, the position of the light receiving element 100 is on the arrangement surface of the microlens array 94, but is not limited thereto, and may be anywhere within the scannable region SR.
  • the MEMS mirror 10 draws an image (video) to be displayed in the drawing region RR by scanning the laser beam a plurality of times (that is, performing a raster scan) as indicated by an arrow in FIG.
  • the sub-scanning direction of the laser light is also referred to as “left-right direction”
  • the main scanning direction perpendicular to the sub-scanning direction is also referred to as “up-down direction”.
  • the MEMS mirror 10 scans a laser beam for a predetermined scanning region “Rtag” including the position of the light receiving element 100 within the scanable region SR and outside the drawing region RR when correcting the optical axis deviation. .
  • a specific scanning method will be described later.
  • the position where the light receiving element 100 is arranged is not limited to that shown in FIG.
  • the light receiving element 100 can be arranged at various positions as long as it is located in the scannable area SR and corresponds to an area outside the drawing area RR.
  • FIG. 3A shows an example of the red laser light LR, the blue laser light LB, and the green laser light LG emitted from the image drawing device 1.
  • FIG. 3B corresponds to each of the red laser light LR, the blue laser light LB, and the green laser light LG irradiated on the microlens array 94 disposed at the position “P” in FIG. An example of a spot to be performed is shown.
  • FIG. 3B corresponds to each of the red laser light LR, the blue laser light LB, and the green laser light LG irradiated on the microlens array 94 disposed at the position “P” in FIG.
  • the circles with the letters “R”, “B”, and “G” written therein indicate the spots of the red laser beam LR, the blue laser beam LB, and the green laser beam LG, respectively.
  • the optical axis of the blue laser light LB is shifted upward by 2 pixels (dots) relative to the optical axis of the red laser light LR
  • the optical axis of the green laser light LG is the red laser light.
  • the image drawing apparatus 1 controls the light emission timings of the lasers LD1 to LD3 so that the optical axes of the laser beams LR, LB, and LG coincide when such an optical axis shift occurs. .
  • the image drawing apparatus 1 performs optical axis deviation correction at a predetermined timing such as when a predetermined input is received from the user or when the image drawing apparatus 1 is activated.
  • the image drawing apparatus 1 first performs a correction process for the optical axis deviation in the main scanning direction, and then executes a correction process for the optical axis deviation in the sub-scanning direction.
  • Each of these correction processes will be specifically described below.
  • (1) Optical axis deviation correction process in the main scanning direction First, an optical axis deviation correction method in the main scanning direction will be described.
  • the image drawing apparatus 1 sequentially scans one line per frame from the top row of the scanning region Rtag by each laser beam, and the light receiving element 100 detects the received light at each frame for each laser beam. Based on whether or not, the optical axis deviation is detected and corrected. Note that the image drawing apparatus 1 draws each frame for each scanning period of each scan repeated a plurality of times per unit time. For example, in the case of 60 FPS, the image drawing apparatus 1 draws each frame for each scanning period of each scan repeated 60 times per second.
  • the number indicating the frame number when counting from the frame in which the uppermost row of the scanning region Rtag is scanned is referred to as “frame number Nf”, and the light receiving element 100 detects the highest light receiving level.
  • This frame number is also referred to as “detection frame number Nfd”.
  • a row (scanning line) in the scanning region Rtag to be scanned for each frame is also referred to as a “scanning target row Ltag”.
  • FIG. 4 is a diagram showing a change in the position of the scan target row Ltag in a time series and a change in the light reception level detected by the light receiving element 100 when the scanning region Rtag is scanned one row per frame by the green laser beam LG. It is. Specifically, FIGS. 4A to 4E show the positions of the scanning target row Ltag corresponding to the frames having the frame numbers Nf of “1” to “5”, respectively, and FIGS. j) shows the change in the light receiving level detected by the light receiving element 100 during the scanning shown in FIGS. 4 (a) to 4 (e), respectively. Similarly, FIG.
  • FIG. 5 shows a change in the position of the scan target row Ltag and a change in the received light level detected by the light receiving element 100 in time series when scanning is performed on the blue laser beam LB
  • FIG. It is a figure which shows the change of the position of the scanning object line Ltag and the change of the light reception level which the light receiving element 100 detects in the time series at the time of performing a scan for the red laser beam LR.
  • the blue laser beam LB has an optical axis shift of one pixel downward with respect to the green laser beam LG, and the red laser beam LR is upward.
  • An optical axis shift for one pixel occurs. Therefore, in this case, the detection frame number Nfd of each laser beam differs depending on the direction and width of the optical axis deviation. Specifically, the frame number Nfd when detecting the green laser beam LG is “3” (see FIGS. 4C and 4H), whereas the frame number Nfd when detecting the blue laser beam LB is “2”. (See FIGS. 5B and 5G), and the frame number Nfd at the time of detection of the red laser beam LR is “4” (see FIGS. 6D and 6I).
  • the image drawing apparatus 1 sets the optical axis of the predetermined laser beam as a reference (fixed) and uses the reference laser beam (“reference laser beam”). Also, the optical axis of the other laser beam is moved based on the difference between the detection frame number Nfd and the other laser beam detection frame number Nfd. More specifically, the image drawing device 1 sets the optical axis of the laser beam having the detection frame number Nfd smaller than the detection frame number Nfd of the reference laser beam Lst to the difference between the detection frame numbers Nfd. The optical axis of the laser beam having a detection frame number Nfd that is larger than the detection frame number Nfd when the reference laser beam Lst is detected is equivalent to the difference between the detection frame numbers Nfd. Move down by the number of pixels you want.
  • the image drawing apparatus 1 detects the blue laser beam LB at the detection time frame number Nfd at the detection time of the green laser light LG. Since the number Nfd is smaller by “1”, the optical axis of the blue laser beam LB is moved upward by one pixel. Further, the image drawing apparatus 1 has the detection time frame number Nfd of the red laser light LR larger by “1” than the detection time frame number Nfd of the green laser light LG, so that the optical axis of the red laser light LR is directed downward. Move one pixel.
  • the image drawing apparatus 1 scans each row of laser light by one row per frame, so that the light in the vertical direction for each pixel is compared with the case of scanning all rows in one frame. Axial misalignment can be detected with high accuracy and optical axis misalignment can be corrected.
  • the scan target row Ltag is an example of the “pattern” in the present invention.
  • FIG. 7 is an example of a flowchart showing a processing procedure for correcting the optical axis deviation in the main scanning direction.
  • the image drawing apparatus 1 repeatedly executes the processing of the flowchart shown in FIG. 7 according to a predetermined cycle.
  • the image drawing apparatus 1 turns on the reference laser beam Lst, and scans the scanning region Rtag one by one for each frame in order from the top (step S101).
  • the image drawing apparatus 1 selects the green laser beam LG as the reference laser beam Lst.
  • the image drawing apparatus 1 determines whether or not the light receiving element 100 detects laser light for each frame (step S102).
  • the image drawing apparatus 1 advances the process to step S103.
  • the image drawing apparatus 1 specifies the detection frame number Nfd when the light receiving element 100 detects the green laser light LG.
  • the image drawing device 1 shifts the scanning target row Ltag downward by one row and continues scanning one row per frame (step). S101).
  • step S103 the image drawing apparatus 1 turns on a predetermined laser beam (in this case, the blue laser beam LB) other than the reference laser beam Lst, and targets 1 per frame for the scanning region Rtag. Scanning is performed for each row in order from the top (step S103). Then, for each frame, the image drawing apparatus 1 determines whether or not the light receiving element 100 has detected laser light (step S104). When the light receiving element 100 has detected laser light (step S104; Yes), The process proceeds to step S105. At this time, the image drawing apparatus 1 specifies the detection frame number Nfd when the light receiving element 100 detects the blue laser beam LB. On the other hand, when the light receiving element 100 does not detect the laser beam (step S104; No), the image drawing apparatus 1 continues scanning by shifting the scanning target row Ltag by one row downward (step S103).
  • a predetermined laser beam in this case, the blue laser beam LB
  • step S105 the image drawing apparatus 1 determines whether the detection frame number Nfd when the light receiving element 100 detects the blue laser beam LB in step S104 is the same as the detection frame number Nfd of the reference laser beam Lst. It is determined whether or not (step S105). As a result, the image drawing apparatus 1 determines whether or not there is an optical axis shift in the main scanning direction between the green laser light LG that is the reference laser light Lst and the blue laser light LB that has been scanned. If the reference laser beam Lst and the detection frame number Nfd are the same (step S105; Yes), the image drawing apparatus 1 determines that these laser beams have no optical axis misalignment in the main scanning direction, The process proceeds to step S107.
  • the image drawing apparatus 1 mainly sets the optical axis of the blue laser beam LB in accordance with the deviation of the detection frame number Nfd. Move in the scanning direction (step S106). As a result, the image drawing apparatus 1 matches the optical axis of the green laser light LG, which is the reference laser light Lst, with the optical axis of the blue laser light LB in the main scanning direction.
  • step S107 the image drawing apparatus 1 turns on the unscanned red laser light LR, and scans the scanning region Rtag one by one for each frame in order from the top (step S107). Then, the image drawing apparatus 1 determines whether or not the light receiving element 100 has detected laser light (step S108). When the light receiving element 100 has detected laser light (step S108; Yes), the image drawing apparatus 1 The process proceeds to step S109. At this time, the image drawing apparatus 1 specifies the detection frame number Nfd when the light receiving element 100 detects the red laser light LR. On the other hand, when the light receiving element 100 does not detect the laser beam (step S108; No), the image drawing apparatus 1 continues scanning by shifting the scanning target row Ltag by one row downward (step S107).
  • step S109 the image drawing apparatus 1 determines whether or not the detection time frame number Nfd of the red laser light LR is the same as the detection time frame number Nfd of the reference laser light Lst (step S109).
  • step S109 the hour frame numbers Nfd are the same (step S109; Yes)
  • step S109 the image drawing apparatus 1 mainly sets the optical axis of the red laser beam LR according to the deviation of the detection frame number Nfd. Move in the scanning direction (step S110).
  • the image drawing apparatus 1 matches the optical axis of the green laser light LG, which is the reference laser light Lst, with the optical axis of the red laser light LR in the main scanning direction.
  • the image drawing apparatus 1 preferably moves each optical beam of the laser light other than the reference laser light Lst according to the difference in timing at which the light receiving element 100 receives each laser light.
  • the optical axes can be matched.
  • the image drawing apparatus 1 scans each laser beam by detecting the frame number at the time of detection for each laser beam by sequentially scanning from the pixel in the top row of the scanning region Rtag by one pixel (dot) per frame. Nfd is calculated, and the optical axis deviation is detected and corrected so that the detected frame numbers Nfd coincide.
  • the image drawing apparatus 1 performs the optical axis deviation correction process in the sub-scanning direction after executing the optical axis deviation correction process in the main scanning direction.
  • the pixel (pixel) of the scanning region Rtag to be scanned for each frame is also referred to as “scanning target pixel Ptag”.
  • FIG. 8 shows the position of the scan target row Ltag in time series when the green laser beam LG, which is the reference laser beam Lst, is sequentially scanned from the pixel in the uppermost row of the scan region Rtag by one pixel per frame. It is a figure which shows the change of this, and the change of the light reception level which the light receiving element 100 detects.
  • FIGS. 8A to 8E show the positions of the scan target pixels Ptag corresponding to the frames having the frame numbers Nf of “1”, “19” to “21”, and “40”, respectively.
  • FIGS. 8F to 8J show changes in the received light level during scanning shown in FIGS. 8A to 8E, respectively.
  • FIG. 9 shows a change in the position of the scanning target row Ltag and a change in the light receiving level detected by the light receiving element 100 when scanning is performed on the blue laser light LB
  • FIG. 10 shows the red laser light LR.
  • FIG. 6 is a diagram illustrating a change in a position of a scan target row Ltag and a change in a light receiving level detected by the light receiving element 100 when scanning is performed on the target.
  • the blue laser beam LB is shifted by one pixel in the right direction with respect to the green laser beam LG which is the reference laser beam Lst, and the red laser The optical axis of the light LR is shifted by one pixel in the left direction. Therefore, in this case, the detection frame number Nfd of each laser beam differs depending on the direction and width of the optical axis deviation. Specifically, the frame number Nfd when detecting the green laser beam LG is “20” (see FIGS. 8C and 8H), whereas the frame number Nfd when detecting the blue laser beam LB is “19”. (See FIGS. 9B and 9G), and the frame number Nfd at the time of detection of the red laser beam LR is “21” (see FIGS. 10D and 10I).
  • the image drawing apparatus 1 causes a shift between the frame numbers Nfd at the time of detection of the reference laser beam Lst and the frame numbers Nfd at the time of detection of other laser beams. Based on this, the moving direction and moving width of the optical axis of the other laser light are determined. More specifically, the image drawing device 1 sets the optical axis of the laser beam having the detection frame number Nfd smaller than the detection frame number Nfd of the reference laser beam Lst to the difference between the detection frame numbers Nfd.
  • the optical axis of the laser beam having the detection frame number Nfd that is larger than the detection frame number Nfd when the reference laser beam Lst is detected corresponds to the difference between the detection frame numbers Nfd. Move to the right by the number of pixels you want.
  • the image drawing apparatus 1 uses the blue laser because the frame number Nfd when detecting the blue laser light LB is smaller by “1” than the frame number Nfd when detecting the green laser light LG.
  • the optical axis of the light LB is moved leftward by one pixel.
  • the image drawing apparatus 1 has the detection time frame number Nfd of the red laser light LR larger by “1” than the detection time frame number Nfd of the green laser light LG, so that the optical axis of the red laser light LR is directed rightward. Move one pixel.
  • the image drawing apparatus 1 scans each laser beam by one pixel per frame, so that the laser beam on the light receiving element 100 is compared with the case where the entire scanning region Rtag is scanned in one frame. Without being affected by the speed at which the light passes, the optical axis deviation in the horizontal direction for each pixel can be detected with high accuracy, and the optical axis deviation can be corrected.
  • the scanning target pixel Ptag is an example of the “pattern” in the present invention.
  • FIG. 11 is an example of a flowchart showing a processing procedure for correcting the optical axis deviation in the sub-scanning direction.
  • the image drawing apparatus 1 executes the process of the flowchart shown in FIG. 11 after the execution of the flowchart shown in FIG.
  • the image drawing apparatus 1 turns on the reference laser beam Lst, and scans one pixel at a time from the pixel in the upper left corner in order for the scanning region Rtag (step S201).
  • the image drawing apparatus 1 selects the green laser beam LG as the reference laser beam Lst.
  • the image drawing apparatus 1 determines whether or not the light receiving element 100 detects laser light for each frame (step S202).
  • the image drawing apparatus 1 advances the process to step S203.
  • the image drawing apparatus 1 specifies the detection frame number Nfd when the light receiving element 100 detects the green laser light LG.
  • the image drawing apparatus 1 adjoins the scanning target pixel Ptag in the downward direction when the pixel adjacent to the right or the scanning target pixel Ptag is at the right end.
  • the scanning is continued by setting the pixel at the left end of the row to be performed (step S201).
  • step S203 the image drawing apparatus 1 turns on a predetermined laser beam (in this case, the blue laser beam LB) other than the reference laser beam Lst, and targets 1 per frame for the scanning region Rtag. Scanning is performed in order from the upper left corner pixel by pixel (step S203). Then, the image drawing apparatus 1 determines whether or not the light receiving element 100 detects the laser beam for each frame (step S204), and when the light receiving element 100 detects the laser light (step S204; Yes), The process proceeds to step S205. At this time, the image drawing apparatus 1 specifies the detection frame number Nfd when the light receiving element 100 detects the blue laser beam LB.
  • a predetermined laser beam in this case, the blue laser beam LB
  • step S204 when the light receiving element 100 does not detect the laser beam (step S204; No), the image drawing apparatus 1 moves downward when the pixel to be scanned Ptag is adjacent to the right or when the pixel to be scanned Ptag is at the right end. Next, scanning is performed by setting the pixel at the left end of the row adjacent to (step S203).
  • step S205 the image drawing apparatus 1 determines whether the detection frame number Nfd when the light receiving element 100 detects the blue laser light LB in step S204 is the same as the detection frame number Nfd of the reference laser light Lst. It is determined whether or not (step S205). Thereby, the image drawing apparatus 1 determines whether or not there is an optical axis shift in the sub-scanning direction between the green laser light LG that is the reference laser light Lst and the blue laser light LB that has been scanned. If the reference laser beam Lst and the detection frame number Nfd are the same (step S205; Yes), the image drawing apparatus 1 determines that these laser beams have no optical axis deviation in the sub-scanning direction, The process proceeds to step S207.
  • the image drawing apparatus 1 changes the optical axis of the blue laser beam LB according to the deviation of the detection frame number Nfd. Move in the scanning direction (step S206). As a result, the image drawing apparatus 1 matches the optical axis of the green laser light LG, which is the reference laser light Lst, with the optical axis of the blue laser light LB in the sub-scanning direction.
  • step S207 the image drawing apparatus 1 turns on the unscanned red laser light LR, and scans the scanning region Rtag one by one from the pixel in the upper left corner in order (step S207). S207). Then, the image drawing apparatus 1 determines whether or not the light receiving element 100 has detected laser light (step S208). When the light receiving element 100 has detected laser light (step S208; Yes), the image drawing apparatus 1 The process proceeds to step S209. At this time, the image drawing apparatus 1 specifies the detection frame number Nfd when the light receiving element 100 detects the red laser light LR.
  • step S208 when the light receiving element 100 does not detect the laser light (step S208; No), the image drawing apparatus 1 moves downward when the pixel to be scanned Ptag is adjacent to the right side or when the pixel to be scanned Ptag is at the right end. Next, scanning is continued by setting the pixel at the left end of the row adjacent to (step S207).
  • step S209 the image drawing apparatus 1 determines whether or not the detection time frame number Nfd of the red laser light LR is the same as the detection time frame number Nfd of the reference laser light Lst (step S209). If the hour frame numbers Nfd are the same (step S209; Yes), the process of the flowchart is terminated. On the other hand, when the reference laser beam Lst and the detection frame number Nfd are not the same (step S209; No), the image drawing apparatus 1 changes the optical axis of the red laser beam LR according to the deviation of the detection frame number Nfd. Move in the scanning direction (step S210). As a result, the image drawing apparatus 1 matches the optical axis of the green laser light LG, which is the reference laser light Lst, with the optical axis of the red laser light LR in the sub-scanning direction.
  • the image drawing apparatus 1 preferably moves each optical beam of the laser light other than the reference laser light Lst according to the difference in timing at which the light receiving element 100 receives each laser light.
  • the optical axes can be matched.
  • the light receiving element 100 has a size of one pixel and is arranged at a position that overlaps with only one predetermined pixel.
  • the configuration to which the present invention is applicable is not limited to this. Instead of this, the light receiving element 100 may have a size of one pixel or more, and may be arranged at a position overlapping a plurality of pixels.
  • the size of the light receiving element 100 is 2 pixels or more will be specifically described with reference to FIG. 12 by taking an optical axis deviation correction process in the sub-scanning direction as an example.
  • FIG. 12 shows changes in the position of the scanning target pixel Ptag and the light receiving level detected by the light receiving element 100 when the scanning target pixel Ptag is on the light receiving element 100 when the light receiving element 100 has a size of 4 pixels.
  • FIG. 12A to 12D the positions of the scan target pixels Ptag corresponding to the frames having the frame numbers Nf of “12”, “13”, “20”, and “21”, respectively. Show.
  • the image drawing apparatus 1 sets the frame number Nfd at the time of detection to, for example, the median value (in this case, “13” or “20”) of the frame number Nf when light reception is detected, or the light reception level is the highest. It is set to the frame number Nf corresponding to the time of high scanning or the frame number Nf for scanning having the longest detection period. In these cases, the image drawing apparatus 1 needs to scan all the pixels in the scanning region Rtag. Therefore, the image drawing apparatus 1 does not determine whether or not the light receiving element 100 detects light reception in steps S104 and S108 in FIG. 7 and steps S204 and S208 in FIG. Determine if a row or pixel has been scanned.
  • the image drawing apparatus 1 uses the detection frame number Nfd when detecting light reception. It is set to the median value of the frame number Nf, or the frame number Nf corresponding to the scanning with the highest light reception level, or the average value of the frame numbers Nf at which light reception is detected. Then, the image drawing apparatus 1 moves the optical axis of the laser light other than the reference laser light Lst according to the difference in the detection frame number Nfd, as in the description of the embodiment.
  • FIG. 13 shows the detection of the position of the scanning target row Ltag and the light receiving device 100 when the scanning target row Ltag is on the light receiving device 100 when the light receiving device 100 is arranged so as to partially overlap a plurality of pixels. It is a figure which shows the change of the received light level. Specifically, FIGS. 13A and 13B show the position of the scan target row Ltag in the third frame and the fourth frame, respectively, and FIGS. 13C and 13D show the positions of 3 and 4, respectively. The change of the light reception level at the time of scanning in the frame and the fourth frame is shown.
  • the light receiving element 100 receives light when scanning two frames corresponding to the case where the scanning target row Ltag is the third row and the fourth row, respectively. Detect.
  • the area in which the pixels in the third row overlap with the light receiving element 100 is larger than the pixels in the fourth row. Therefore, as shown in FIGS. 13C and 13D, the light reception level corresponding to the scanning of the frame having the frame number Nf “3” corresponds to the scanning of the frame having the frame number Nf of “4”. It is higher than the light reception level. Therefore, in this case, the image drawing device 1 sets the frame number Nf (here “3”) having the highest light reception level as the frame number Nfd at the time of detection.
  • the image drawing apparatus 1 performs scanning with the highest light receiving level.
  • the frame number Nf corresponding to the time is set to the detection frame number Nfd.
  • the image drawing apparatus 1 moves the optical axis of the laser light other than the reference laser light Lst according to the difference in the detection frame number Nfd, as in the description of the embodiment.
  • the image drawing device 1 when the light receiving element 100 has a size of one pixel or more, or / and is disposed at a position that partially overlaps a plurality of pixels, the image drawing device 1 includes a modification 2 and a later-described modification. By executing the processing according to the third modification, the optical axis deviation can be corrected with higher accuracy.
  • the image drawing apparatus 1 sets the scanning target row Ltag to one row of pixels, but the method to which the present invention is applicable is not limited to this. Instead of this, the image drawing apparatus 1 may set a plurality of rows of pixels as the scan target row Ltag. This will be specifically described with reference to FIG.
  • FIG. 14 is a diagram showing the position of the scanning target row Ltag in the scanning region Rtag when two adjacent pixels in the main scanning direction are set as the scanning target row Ltag. Specifically, FIG. 14A shows the position of the scan target row Ltag in the frame with the frame number “2”, and FIG. 14B shows the scan target in the frame with the frame number “3”. The position of the row Ltag is shown, and FIG. 14C shows the position of the scan target row Ltag in the frame whose frame number is “4”.
  • the image drawing apparatus 1 scans all the rows in the scanning region Rtag by shifting the scanning target row Ltag downward by one row for each frame. Then, the image drawing apparatus 1 calculates the average value of the light reception level for each frame, and sets the frame number having the highest average value as the detection frame number Nfd. In FIG. 14, since the area of the light receiving element 100 that overlaps the scanning target row Ltag becomes the largest during the scanning of the third frame, the image drawing apparatus 1 sets the detection frame number Nfd to “3”.
  • the image drawing device 1 accurately specifies the frame number Nfd at the time of detection of each laser beam even when a plurality of adjacent rows are set as the scan target row Ltag, and the frame number Nfd at the time of detection is determined. Based on the difference, the optical axis deviation can be corrected appropriately.
  • the image drawing apparatus 1 appropriately determines the frame number Nfd at the time of detection of each laser beam even when the light receiving elements 100 are arranged in an overlapping manner over a plurality of rows as in the example shown in FIG. Therefore, the optical axis shift can be corrected more accurately.
  • the image drawing apparatus 1 may determine the number of rows designated as the scan target row Ltag based on the width of the light receiving element 100 in the main scanning direction. For example, the image drawing apparatus 1 designates the number of rows (“2” in the example of FIG. 14) at the position overlapping with the light receiving element 100 as the number of rows to be scanned Ltag. By doing in this way, the image drawing device 1 can uniquely determine the detection frame number Nfd corresponding to the position of the light receiving element 100 even when the area where the light receiving element 100 is arranged is large, Optical axis deviation can be corrected with higher accuracy.
  • the image drawing apparatus 1 sets the scanning target pixel Ptag to one pixel when correcting the optical axis deviation in the sub-scanning direction. It is not limited. Instead of this, the image drawing apparatus 1 may set a plurality of pixels as the scanning target pixel Ptag. This will be described with reference to two specific examples of the first example and the second example.
  • FIG. 15 is a diagram illustrating the position of the scan target pixel Ptag according to the first example of the present modification. Specifically, FIGS. 15A to 15C show the positions of the scan target pixels Ptag corresponding to the frames having the frame numbers Nf of 3 to 5, respectively.
  • the image drawing device 1 designates one column of pixels as the scanning target pixel Ptag, and puts it to the leftmost in the scanning region Rtag for each column per frame. Scanning is performed in order from the position of the line to the rightmost line. Then, the image drawing apparatus 1 sets the frame number Nfd at the time of detection to the number of the frame in which the light receiving element 100 detects the received light. In addition, when there are a plurality of frames in which the light receiving element 100 detects light reception, the image drawing apparatus 1 sets the frame number Nf at the time of detecting the highest light reception level, for example, as the detection frame number Nfd.
  • the image drawing apparatus 1 since scanning is performed for each column per frame, the image drawing apparatus 1 can shorten the time required for the optical axis deviation correction processing in the sub-scanning direction. Further, according to the first example, the image drawing apparatus 1 may execute the optical axis deviation correction process in the sub-scanning direction before executing the optical axis deviation correction process in the main scanning direction.
  • the image drawing apparatus 1 scans a plurality of consecutive columns per frame and shifts the column to be scanned one column at a time. Good.
  • the image drawing apparatus 1 can uniquely set the detection frame number Nfd and correct the optical axis deviation.
  • FIG. 16 is a diagram illustrating the position of the scanning target pixel Ptag according to the second example of the present modification and the change in the received light level corresponding thereto.
  • FIGS. 16A to 16E show the positions of the scanning target pixels Ptag at the time of scanning in the respective frames whose frame numbers Nf are “13” to “17”.
  • FIG. (J) to (j) show changes in the received light level detected during the scanning shown in FIGS. 16 (a) to (e), respectively.
  • the image drawing apparatus 1 designates three pixels adjacent in the left-right direction as scanning target pixels Ptag, and moves one pixel to the right by one frame.
  • the scanning target pixel Ptag is moved and all the pixels in the row being scanned are scanned, the three pixels at the left end of the lower adjacent row are scanned as the scanning target pixel Ptag.
  • the light receiving element 100 detects light reception in the 14th to 16th frames.
  • the image drawing apparatus 1 sets the frame number Nf (“15” in the example of FIG.
  • the image drawing apparatus 1 can more reliably suppress the detection omission of received light and the like and increase the accuracy of the optical axis deviation correction by designating a plurality of pixels as the scanning target pixel Ptag.
  • the image drawing apparatus 1 moves the scanning target row Ltag downward by one row for each frame in the optical axis deviation correction processing in the main scanning direction.
  • the image drawing apparatus 1 may determine the movement width of the scan target row Ltag according to the width of the light receiving element 100 in the main scanning direction. For example, the image drawing apparatus 1 sets the movement width of the scan target row Ltag to be equal to or smaller than the width of the light receiving element 100 in the main scanning direction. Specifically, when the width of the light receiving element 100 in the main scanning direction is 2 pixels or more and less than 3 pixels, the image drawing apparatus 1 sets the movement width of the scanning target row Ltag to 2 rows (pixels). Also by this, the image drawing apparatus 1 can cause the light receiving element 100 to detect the laser beam and can quickly complete the optical axis deviation correction process in the main scanning direction.
  • the image drawing apparatus 1 performs scanning according to the width of the light receiving element 100 in the sub-scanning direction instead of moving the scanning target pixel Ptag by one pixel per frame in the optical axis deviation correction processing in the sub-scanning direction.
  • the movement width of the target pixel Ptag may be determined.
  • the image drawing apparatus 1 sets the movement width of the scanning target pixel Ptag to be equal to or smaller than the width of the light receiving element 100 in the sub scanning direction.
  • the image drawing apparatus 1 can cause the light receiving element 100 to detect the laser light and can quickly complete the optical axis deviation correction process in the sub-scanning direction.
  • FIG. 17 shows a configuration example of a head-up display according to the present invention.
  • the head-up display shown in FIG. 17 causes the driver to visually recognize the virtual image “Iv” via the combiner 26.
  • the light source unit 1A functions as the image drawing device 1 of the above-described embodiment.
  • the light source section 1A is attached to the ceiling section 22 in the passenger compartment via the support members 11a and 11b, and includes map information including the current location, route guidance information, traveling speed, and other information for assisting driving (hereinafter referred to as “driving assistance”).
  • driving assistance information for assisting driving
  • Light constituting a display image indicating “information” is emitted toward the combiner 26.
  • the light source unit 1A generates an original image (real image) of the display image in the light source unit 1, and emits light constituting the image to the combiner 26, thereby allowing the driver to visually recognize the virtual image Iv. .
  • the combiner 26 projects the display image emitted from the light source unit 1 and reflects the display image to the driver's viewpoint (eye point) “Pe” to display the display image as a virtual image Iv. And the combiner 26 has the support shaft part 27 installed in the ceiling part 22, and rotates the support shaft part 27 as a spindle.
  • the support shaft portion 27 is installed, for example, in the vicinity of the ceiling portion 22 near the upper end of the front window 20, in other words, in the vicinity of a position where a sun visor (not shown) for the driver is installed.
  • the configuration of the head-up display to which the present invention is applicable is not limited to this.
  • the head-up display does not include the combiner 26, and the light source unit 1A may reflect the display image on the front window 20 to the driver's eye point Pe by projecting the light onto the front window 20.
  • the position of the light source unit 1 ⁇ / b> A is not limited to being installed on the ceiling unit 22, and may be installed inside the dashboard 24.
  • the dashboard 24 is provided with an opening for allowing light to pass through the combiner 26 or the front window 20.
  • the present invention can be used for various video devices using RGB lasers, such as laser projectors, head-up displays, and head-mounted displays.
  • Image drawing device 3 Video ASIC 7 Laser driver ASIC 8 MEMS control unit 9 Laser light source unit 100 Light receiving element

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  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L'invention porte sur un dispositif de correction de décalage d'axe optique qui comprend un moyen de balayage (10), un élément récepteur de lumière (100), un moyen de commande, un moyen de détection et un moyen de correction pour corriger un décalage d'axe optique d'un premier faisceau émis par une première source de lumière et d'un second faisceau émis par une seconde source de lumière. Le moyen de balayage (10) fait balayer une zone de balayage par le premier faisceau et le second faisceau. Le moyen de commande change la position de l'exposition au premier faisceau et au second faisceau dans la zone de balayage pour une direction de balayage principale ou une direction de balayage secondaire pour la zone de balayage dans chaque période de balayage d'une pluralité de périodes de balayage répétées pour chaque balayage. Le moyen de détection détecte le décalage des axes optiques du premier faisceau et du second faisceau en fonction de différences entre l'instant de réception de lumière du premier faisceau et l'instant de réception de lumière du second faisceau par l'élément récepteur de lumière (100). Le moyen de correction corrige le décalage d'axe optique pour le premier faisceau et le second faisceau sur la base du décalage détecté par le moyen de détection.
PCT/JP2011/072052 2011-09-27 2011-09-27 Dispositif de correction de décalage d'axe optique, procédé de commande et dispositif d'affichage tête haute WO2013046329A1 (fr)

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PCT/JP2011/072052 WO2013046329A1 (fr) 2011-09-27 2011-09-27 Dispositif de correction de décalage d'axe optique, procédé de commande et dispositif d'affichage tête haute
JP2013535685A JP5731660B2 (ja) 2011-09-27 2011-09-27 投影装置、制御方法及びプログラム

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PCT/JP2011/072052 WO2013046329A1 (fr) 2011-09-27 2011-09-27 Dispositif de correction de décalage d'axe optique, procédé de commande et dispositif d'affichage tête haute

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014197053A (ja) * 2013-03-29 2014-10-16 船井電機株式会社 プロジェクタ装置およびヘッドアップディスプレイ装置
JP2016177006A (ja) * 2015-03-18 2016-10-06 アルプス電気株式会社 画像表示装置
JP2017021131A (ja) * 2015-07-09 2017-01-26 株式会社リコー 光走査装置、画像表示装置、物体装置及び光走査方法

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US4684996A (en) * 1986-08-25 1987-08-04 Eastman Kodak Company Video projector with optical feedback
JP2001264660A (ja) * 2000-03-23 2001-09-26 Matsushita Electric Ind Co Ltd 映像表示装置
JP2007121383A (ja) * 2005-10-25 2007-05-17 Fujifilm Corp 変調信号発生装置及び画像形成装置
JP2008026590A (ja) * 2006-07-21 2008-02-07 Mitsubishi Electric Corp 画像表示装置及び画像表示方法
JP2010020087A (ja) * 2008-07-10 2010-01-28 Funai Electric Co Ltd 画像表示装置
JP2011154324A (ja) * 2010-01-28 2011-08-11 Pioneer Electronic Corp 画像表示装置
JP2011180541A (ja) * 2010-03-04 2011-09-15 Nippon Seiki Co Ltd 表示装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4684996A (en) * 1986-08-25 1987-08-04 Eastman Kodak Company Video projector with optical feedback
JP2001264660A (ja) * 2000-03-23 2001-09-26 Matsushita Electric Ind Co Ltd 映像表示装置
JP2007121383A (ja) * 2005-10-25 2007-05-17 Fujifilm Corp 変調信号発生装置及び画像形成装置
JP2008026590A (ja) * 2006-07-21 2008-02-07 Mitsubishi Electric Corp 画像表示装置及び画像表示方法
JP2010020087A (ja) * 2008-07-10 2010-01-28 Funai Electric Co Ltd 画像表示装置
JP2011154324A (ja) * 2010-01-28 2011-08-11 Pioneer Electronic Corp 画像表示装置
JP2011180541A (ja) * 2010-03-04 2011-09-15 Nippon Seiki Co Ltd 表示装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014197053A (ja) * 2013-03-29 2014-10-16 船井電機株式会社 プロジェクタ装置およびヘッドアップディスプレイ装置
JP2016177006A (ja) * 2015-03-18 2016-10-06 アルプス電気株式会社 画像表示装置
JP2017021131A (ja) * 2015-07-09 2017-01-26 株式会社リコー 光走査装置、画像表示装置、物体装置及び光走査方法

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JP5731660B2 (ja) 2015-06-10

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