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WO2016147578A1 - Projecteur - Google Patents

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Publication number
WO2016147578A1
WO2016147578A1 PCT/JP2016/001077 JP2016001077W WO2016147578A1 WO 2016147578 A1 WO2016147578 A1 WO 2016147578A1 JP 2016001077 W JP2016001077 W JP 2016001077W WO 2016147578 A1 WO2016147578 A1 WO 2016147578A1
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WO
WIPO (PCT)
Prior art keywords
light
color
separation layer
color separation
incident
Prior art date
Application number
PCT/JP2016/001077
Other languages
English (en)
Japanese (ja)
Inventor
洋一 宍戸
成松　修司
Original Assignee
セイコーエプソン株式会社
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Filing date
Publication date
Application filed by セイコーエプソン株式会社 filed Critical セイコーエプソン株式会社
Publication of WO2016147578A1 publication Critical patent/WO2016147578A1/fr

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    • 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
    • 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
    • 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]

Definitions

  • the present invention relates to a projector.
  • a light source a light modulation device that modulates light emitted from the light source to form an image according to image information
  • a projection optical device that enlarges and projects the formed image onto a projection surface such as a screen
  • a projector one trichromaticity which separates red, green and blue color lights from light emitted from a light source and synthesizes modulated light of each color light by a light modulation device provided according to each color light.
  • One having a prism assembly is known (for example, see Patent Document 1).
  • the projector (projection apparatus) described in Patent Document 1 includes a light source, a PBS that transmits p-polarized light and reflects s-polarized light out of the light emitted from the light source, three prisms, and two dichroic properties.
  • a prism assembly having a coating, three reflective light valves as light modulation devices, and a projection optical device are provided.
  • each dichroic film of the prism assembly separates red, green, and blue color light from the s-polarized light reflected by the PBS, and these color lights are respectively incident on the corresponding reflective light valves. Modulated.
  • each color light that has been modulated by the reflective light valve to become p-polarized light is incident again on the prism assembly, is synthesized by the prism assembly, and is incident on the PBS.
  • These colored lights pass through the PBS, enter the projection optical apparatus, and are projected by the projection optical apparatus.
  • the difference between the color separation characteristic for p-polarized light and the color separation characteristic for s-polarized light is large.
  • the threshold value of the wavelength at which transmission and reflection are switched is substantially the same for p-polarized light and s-polarized light.
  • the incident angle of light is small
  • the difference in the threshold value of the wavelength between p-polarized light and s-polarized light becomes large.
  • a projector includes a light source device, three light modulation devices that are provided according to each of the three color lights included in the emitted light emitted from the light source device, and modulate the corresponding color lights, respectively.
  • the three color lights are separated from the outgoing light incident on the inside through the incident / exit surface and are incident on the three light modulators, and are modulated by the three light modulators and incident on the third color light.
  • a first color separation layer that separates the third color light; and the second color light and the third color light that are located on the light incident side of the third prism and separated by the first color separation layer.
  • a second color separation layer that reflects two-color light and transmits the third color light, and includes incident angles of the three color lights with respect to the first color separation layer and the second color separation layer with respect to the second color separation layer.
  • the incident angles of the color light and the third color light are different from each other, and the color light separated by the first color separation layer and the second color separation layer is the same as that of the three color lights incident on the first color separation layer.
  • the color light separated by the first color separation layer and the second color separation layer is incident on the color light incident angle on the first color separation layer and on the second color separation layer. It is set based on the incident angle of the color light and the wavelength distribution of the emitted light from the light source device. That is, among the first color light, the second color light, and the third color light having different wavelengths, the color light reflected by the first color separation layer and the color light reflected by the second color separation layer are the first color. It is set based on the incident angle of the colored light with respect to the separation layer and the second color separation layer and the wavelength distribution of the emitted light from the light source device.
  • the color separation characteristics for each polarized light of the first color separation layer and the second color separation layer can be grasped, Based on the color separation characteristics and the wavelength distribution of the emitted light from the light source device, the color light is separated from the emitted light, and the loss of light when the modulated colored lights are combined is reduced. Color light separated by the first color separation layer and the second color separation layer can be set. Therefore, the utilization efficiency of the light emitted from the light source device and projected as an image can be improved, and the brightness of the projected image can be increased.
  • the first color separation layer reflects the first color light and transmits the second color light and the third color light. According to the above aspect, since the first color separation layer transmits the second color light and the third color light, the first color separation layer passes along the central axis of the light emitted from the light source device and incident through the incident / exit surface.
  • the one color separation layer and the second color separation layer can be arranged in series, whereby the first prism, the second prism, and the third prism can be arranged in series along the central axis.
  • the second prism is disposed on the traveling direction side of the first color light transmitted through the first color separation layer, and the second color light and the third color light reflected on the first color separation layer are arranged on the traveling direction side.
  • the dichroic prism can be made more compact than when the second prism and the third prism are arranged apart from each other. Therefore, a small dichroic prism can be adopted, and the projector can be downsized.
  • the first color light, the second color light, and the third color light are blue light, green light, and red light, and the incident light out of the first color separation layer and the second color separation layer. It is preferable that the color separation layer having a small angle separates one of two color lights having a small interval between peak wavelengths of blue light, green light, and green light and red light.
  • the color separation characteristic in the p-polarized light and the color separation characteristic in the s-polarized light are large. If one of the two color lights having a small interval is separated, one of the p-polarized light and the s-polarized light (for example, p-polarized light) is incident on the dichroic prism as the emitted light, and is modulated by the light modulation device. When the other polarized light (for example, s-polarized light) is synthesized by the dichroic prism and emitted, at least one of the two colored lights is lost. The lost light is not incident on the projection optical device, and the light use efficiency is reduced.
  • the color separation layer of the first color separation layer and the second color separation layer has a small incident angle of colored light and a small difference in color separation characteristics between p-polarized light and s-polarized light.
  • the light source device includes: a solid-state light source that emits the blue light; and a phosphor that emits fluorescence including the green light and the red light when the blue light is incident thereon, and the dichroic prism.
  • the blue light and the fluorescence are incident, and among the first color separation layer and the second color separation layer, the color separation layer having a small incident angle is one of the green light and the red light. Is preferably reflected, and the other is preferably transmitted.
  • the wavelength width of the blue light emitted from the solid-state light source is relatively narrow, but the wavelength widths of the green light and the red light included in the fluorescence emitted when the blue light is incident and emitted are relatively wide. For this reason, when one of green light and red light is separated (reflected) by the color separation layer having a large incident angle of the light (color separation layer having a large difference in color separation characteristics between p-polarized light and s-polarized light). The loss of color light of at least one of these green light and red light becomes large.
  • one of green light and red light is separated by a color separation layer having a small incident angle of light (a color separation layer having a small difference in color separation characteristics between p-polarized light and s-polarized light).
  • a color separation layer having a small difference in color separation characteristics between p-polarized light and s-polarized light By making (reflection), the loss of these green light and red light can be reduced. Therefore, the light utilization efficiency can be improved reliably, and the brightness of the projected image can be reliably increased.
  • the light source device includes a solid light source that emits the blue light, the green light, and the red light, respectively, and the dichroic prism includes the blue light and the green light emitted from the solid light source.
  • the color separation layer having a small incident angle among the first color separation layer and the second color separation layer reflects one of the blue light and the green light, It is preferable to transmit the other.
  • Each color light of blue, green, and red emitted from the solid light source is light having a relatively narrow wavelength width.
  • the peak wavelength of each color light emitted from the solid state light source may deviate depending on the temperature when the solid state light source is turned on.
  • interval is smaller than green light and red light by the color separation layer (color separation layer with a small difference of color separation characteristics with p polarization
  • One of blue light and green light is separated (reflected).
  • the polarization conversion element disposed between the light source device and the dichroic prism and aligning the polarization direction of incident light, and disposed between the polarization conversion element and the dichroic prism, the polarization conversion element A polarization separation device that transmits the light incident through the dichroic prism and reflects the light that is modulated by the three light modulation devices and incident through the dichroic prism toward the projection optical device. preferable.
  • the emitted light whose polarization direction is aligned by the polarization conversion element can be incident on the dichroic prism, and thus on each light modulation device, when randomly polarized light is incident on each of them.
  • the light utilization efficiency can be further increased.
  • the emitted light whose polarization direction is aligned by the polarization conversion element is transmitted through the polarization separation device and incident on the dichroic prism, and the modulated light of each light modulation device emitted from the dichroic prism is the polarization separation device. Is reflected toward the projection optical device.
  • the projector can be reduced in size.
  • the dichroic prism emits the first color light, and the first emission surface facing the light modulation device that modulates the first color light among the three light modulation devices, and the second Color light is emitted, and among the three light modulation devices, a second emission surface facing the light modulation device that modulates the second color light, the third color light is emitted, and the three light modulation devices It is preferable that each of the three light modulation devices is a reflection type light modulation device.
  • An example of the reflective light modulation device is a reflective light valve.
  • each of the three light modulation devices is a reflection-type light modulation device, the optical path until the light emitted from the first to third emission surfaces is modulated and incident is shortened. it can. Therefore, the projector can be further downsized.
  • a gap is provided between the first color separation layer and the second prism, and the second prism and the second prism are provided between the first prism and the first color separation layer.
  • the incident angles of the three color lights to the first color separation layer are It is preferable that the incident angle of the second color light and the third color light to the two-color separation layer is larger.
  • the light reflected by the first color separation layer is totally reflected by the top entry exit surface of the first prism and guided to the corresponding light modulation device.
  • the light reflected by the second color separation layer is totally reflected inside the second prism at the surface of the second prism where a gap is formed between the first color separation layer and the second color separation layer.
  • the light guided to the corresponding light modulation device and transmitted through the second color separation layer passes through the third prism and is guided to the corresponding light modulation device.
  • a gap formed between the first color separation layer and the second prism which is difficult to control, is necessary.
  • each of the first color separation layer and the second color separation layer is compared with a case where a dichroic prism in which each color separation layer and each prism are combined with no gap is adopted. The incident angle can be reduced. Therefore, the color separation characteristics of each color separation layer can be improved.
  • the incident angles of the three color lights to the first color separation layer are the same as the incident angles to the second color separation layer. It is preferable that the incident angle is smaller than the incident angles of the second color light and the third color light.
  • the light reflected by the first color separation layer is totally reflected by the upper writing exit surface of the first prism and guided to the corresponding light modulation device as described above.
  • the light reflected by the second color separation layer passes through the second prism and is guided to the corresponding light modulation device, and the light transmitted through the second color separation layer is the same as described above.
  • the light passes through the third prism and is guided to the corresponding light modulation device.
  • Such a dichroic prism can be easily manufactured without the need for providing the gap.
  • FIG. 1 is a schematic diagram showing a schematic configuration of a projector according to a first embodiment of the invention.
  • adopted according to an illuminating device The figure which shows the wavelength distribution of the emitted light from the illuminating device which the projector concerning 3rd Embodiment of this invention has, and the color separation characteristic of the dichroic prism employ
  • FIG. 1 is a schematic diagram illustrating a schematic configuration of a projector 1 according to the present embodiment.
  • the projector 1 according to the present embodiment modulates the light beam emitted from the light source device 31A provided therein to form an image according to image information, and enlarges and projects the image on a projection surface such as a screen. It is a display device.
  • the projector 1 includes an exterior housing 2 that forms an exterior, and an optical unit 3 that is housed in the exterior housing 2.
  • a cooling device that cools the components of the projector 1
  • a power supply device that supplies power to the components of the projector 1
  • the operation of the projector 1 are controlled in the exterior housing 2.
  • a control device and the like are provided.
  • the optical unit 3 is an optical device that forms and projects an image according to image information input from the control device.
  • the optical unit 3 includes an illumination device 31, a relay device 32, a dichroic prism 34, a light modulation device 35, and a projection optical device 36.
  • the illumination device 31 includes a light source device 31 ⁇ / b> A and a uniformizing device 31 ⁇ / b> B, and emits uniform illumination light having a uniform polarization direction to the relay device 32.
  • the light source device 31 ⁇ / b> A includes a solid light source device 311 having at least one solid light source, a condensing optical device 312, a rotating fluorescent plate 313, and a motor 314.
  • the solid-state light source device 311 is a laser light source that emits blue laser light (emission intensity peak: approximately 455 nm) as excitation light.
  • the solid light source device 311 may have one laser light source (LD: Laser Diode) or may have a plurality of laser light sources. Alternatively, a light source device that emits blue light having a wavelength other than 455 nm with a peak of emission intensity can be used.
  • the condensing optical device 312 includes a first lens 3121 and a second lens 3122.
  • the condensing optical device 312 is disposed in the optical path from the solid light source device 311 to the rotating fluorescent plate 313, and substantially collects the excitation light and makes it incident on the rotating fluorescent plate 313.
  • the first lens 3121 and the second lens 3122 are convex lenses.
  • the rotating fluorescent plate 313 is formed by forming a phosphor layer 3132 (phosphor) for converting the wavelength of incident light on a disc 3131 rotated by a motor 314 along the circumferential direction of the disc 3131. is there.
  • the rotating fluorescent plate 313 emits red light and green light toward the side opposite to the side on which blue light is incident.
  • the disc 3131 is made of a material that transmits blue light.
  • quartz glass, crystal, sapphire, optical glass, and transparent resin can be used as the material of the disk 3131.
  • Blue light emitted from the solid state light source device 311 enters the phosphor layer 3132 from the disk 3131 side.
  • a dichroic film 3133 that transmits blue light and reflects green light and red light is provided between the disk 3131 and the phosphor layer 3132.
  • the phosphor layer 3132 is excited by the excitation light and emits yellow light including green light and red light. In the present embodiment, the phosphor layer 3132 is excited by blue light having a wavelength of approximately 445 nm.
  • the phosphor layer 3132 converts part of the excitation light from the solid-state light source device 311 into light including green light and red light, and passes the remaining part without conversion.
  • the phosphor layer 3132 is, for example, a layer containing (Y, Gd) 3 (Al, Ga) 5 O 12 : Ce that is a YAG phosphor.
  • the homogenizer 31B homogenizes the in-plane intensity distribution (illuminance distribution) perpendicular to the central axis of the light incident from the light source device 31A.
  • the homogenizer 31B includes a collimator lens 315, a first lens array 316, a second lens array 317, a polarization conversion element 318, and a superimposing lens 319.
  • the collimating lens 315 is a convex lens, and substantially collimates the light incident from the light source device 31A.
  • the first lens array 316 includes a plurality of first small lenses that divide the light incident from the collimating lens 315 into a plurality of partial light beams.
  • first small lenses are arranged in a matrix in a plane perpendicular to the illumination optical axis Ax (designed optical axis, the central axis of the light emitted from the light source device 31A).
  • the second lens array 317 has a plurality of second small lenses corresponding to the plurality of first small lenses.
  • the second lens array 317 together with the superimposing lens 319, forms an image of each first small lens incident from the first lens array 316 in the vicinity of the image forming area of each light modulation device 35R, 35G, 35B, Thus, the plurality of partial light beams are superimposed on each image forming area.
  • Each second small lens is also arranged in a matrix in a plane orthogonal to the illumination optical axis Ax.
  • the polarization conversion element 318 has a function of aligning the polarization directions of the partial light beams divided by the first lens array 316. Specifically, the polarization conversion element 318 transmits one linearly polarized light component (linearly polarized light component having one polarization direction) of the polarized light components included in the light from the rotating fluorescent plate 313 as it is and the other linearly polarized light component.
  • a polarization separation layer that reflects (linear polarization component having the other polarization direction) in a direction perpendicular to the illumination optical axis Ax, and the other linear polarization component reflected by the polarization separation layer in a direction parallel to the illumination optical axis Ax
  • the polarization conversion element 318 is configured to emit p-polarized light, but may be configured to emit s-polarized light.
  • the relay device 32 has a function of guiding the emitted light emitted from the illumination device 31 to the dichroic prism 34.
  • the relay device 32 includes a total reflection mirror 321, a collimating lens 322, and a polarization separation device 323.
  • the total reflection mirror 321 reflects the light incident from the illumination device 31 toward the parallelizing lens 322.
  • the collimating lens 322 collimates light incident from the total reflection mirror 321.
  • the polarization separation device 323 is a so-called plate-type polarization beam splitter (PBS), and allows one of p-polarized light and s-polarized light to pass therethrough and reflects the other polarized light.
  • the polarization separation device 323 transmits p-polarized light and reflects s-polarized light. For this reason, the light incident through the total reflection mirror 321 and the collimating lens 322, that is, the light aligned to the p-polarized light by the polarization conversion element 318 passes through the polarization separation device 323 and is emitted to the dichroic prism 34. Is done.
  • the modulated light that is modulated by a light modulation device 35 to be described later and incident through the dichroic prism 34 is reflected by the polarization separation device 323 and incident on the projection optical device 36.
  • the dichroic prism 34 separates the three color lights of blue, green, and red from the outgoing light (p-polarized light including blue light and the above-described fluorescence) of the illumination device 31 that is incident via the relay device 32. It has a function to enter the corresponding light modulator 35 (35B, 35G, 35R). In addition, the dichroic prism 34 has a function of emitting combined light obtained by combining light of each color (s-polarized light) that is modulated and incident by the light modulation device 35.
  • the dichroic prism 34 is a so-called gapless prism, and a first color separation layer 344 located between the first prism 341, the second prism 342, and the third prism 343, and the first prism 341 and the second prism 342. And a second color separation layer 345 positioned between the second prism 342 and the third prism 343, and the prisms 341 to 343 are combined.
  • the first prism 341 is formed in a triangular prism shape, and is arranged at a position closest to the polarization beam splitter 323 among the prisms 341 to 343.
  • the first prism 341 has an incident / exit surface 3411 on which the light that has passed through the polarization separation device 323 is incident and the combined light is emitted.
  • the incident / exit surface 3411 is disposed so as to be orthogonal to the central axis of the light incident from the relay device 32.
  • the first prism 341 is joined to the second prism 342.
  • the first color separation layer 344 that reflects red light and transmits green light and blue light among light incident through the incident / exit surface 3411. Is arranged.
  • the first color separation layer 344 is disposed so as to be inclined with respect to the central axis of the light incident on the first prism 341 via the incident / exit surface 3411.
  • the red light R reflected by the first color separation layer 344 is incident on the incident / exit surface 3411 from the inside of the first prism 341 at an angle equal to or greater than the critical angle and is totally reflected, and the output surface 3412 of the first prism 341.
  • the light is emitted from the (first emission surface) toward the light modulation device 35R.
  • the blue light B and the green light G transmitted through the first color separation layer 344 are incident on the second prism 342.
  • the second prism 342 has a substantially trapezoidal quadrangular prism shape and is joined to the first prism 341 and the third prism 343. Between the second prism 342 and the third prism 343, the second color separation layer 345 that reflects the blue light B and transmits the green light G is disposed.
  • the second color separation layer 345 is disposed so as to be inclined with respect to the central axes of the blue light B and the green light G transmitted through the first color separation layer 344. That is, the second color separation layer 345 and the first color separation layer 344 have different angles with respect to the illumination optical axis Ax that substantially coincides with the central axis of the light incident on the incident / exit surface 3411 from the polarization separation device 323. It is inclined at.
  • the first color separation layer 344 has a crossing angle with respect to the central axis of the color light of the first color separation layer 344 and the second color separation layer 345 that is smaller than that of the second color separation layer 345.
  • the incident angle of light with respect to the first color separation layer 344 is smaller than the incident angle of light with respect to the second color separation layer 345.
  • the first color separation layer 344 and the second color separation layer 345 are arranged so that the inclination with respect to the central axis is reversed.
  • the incident angle of light (blue, green, and red color light B, G, R) to the first color separation layer 344 is +25 degrees, whereas light to the second color separation layer 345 ( The incident angles of the blue and green color lights B and G) are ⁇ 40 degrees.
  • the blue light B is reflected by the second color separation layer 345.
  • the blue light B travels through the second prism 342 and is emitted from the emission surface 3421 (second emission surface) of the second prism 342 toward the light modulation device 35B.
  • the green light G passes through the second color separation layer 345 and enters the third prism 343.
  • the third prism 343 is formed in a quadrangular prism shape with a substantially trapezoidal cross section, and is joined to the second prism 342 as described above.
  • the green light G incident on the third prism 343 via the second color separation layer 345 is located in the traveling direction of the green light G and is an output surface 3431 substantially parallel to the incident / exit surface 3411. That is, the light is emitted from the emission surface 3431 (third emission surface) orthogonal to the illumination optical axis Ax toward the light modulation device 35G.
  • the color lights B, G, R modulated by the light modulation devices 35R, 35G, 35B follow the incident paths of the color lights B, G, R to the light modulation devices 35R, 35G, 35B in reverse. And is emitted from the incident / exiting surface 3411 toward the polarization separation device 323 as synthesized light.
  • the light modulation device 35 (light modulation devices for blue, green, and red color lights are respectively 35B, 35G, and 35R) modulate the incident blue, green, and red color lights B, G, and R, respectively.
  • each light modulation device 35 is a reflection type light modulation device that modulates each color light B, G, R in the process of reflecting.
  • these light modulators 35B, 35G, and 35R are configured by reflective liquid crystal light valves.
  • Each of the light modulation devices 35B, 35G, and 35R is arranged so as to be orthogonal to the central axes of the blue, green, and red color lights B, G, and R incident from the corresponding emission surfaces 3421, 3431, and 3412, respectively. Opposed to the surfaces 3421, 3431, and 3412. Then, each of the light modulation devices 35B, 35G, and 35R causes the modulated light obtained by modulating each incident color light to enter the corresponding emission surfaces 3421, 3431, and 3412.
  • the projection optical device 36 directs the combined light (the combined light of red, green and blue modulated light) modulated by the light modulators 35 and combined by the dichroic prism 34 toward the projection surface. Project.
  • the projection optical device 36 is disposed at a position where the combined light reflected by the polarization separation device 323 is incident.
  • the projection optical device 36 is configured as a combined lens having a lens barrel and a plurality of lenses housed and arranged in the lens barrel.
  • FIG. 2 is a diagram showing the color separation characteristics of the color separation layers 344 and 345 for each type of polarized light when the first color separation layer 344 separates red light and the second color separation layer 345 separates blue light. It is.
  • the transmittances of the p-polarized light and the s-polarized light of the first color separation layer 344 are indicated by fine dotted lines (Tp) and two-dot chain lines (Ts), respectively, and the p-polarized light and s of the second color separation layer 345 are shown.
  • the transmittance of polarized light is indicated by a solid line (Tp) and a large dotted line (Ts), respectively.
  • Tp solid line
  • Ts large dotted line
  • the color separation characteristics of the color separation layer that reflects light that is greater than or equal to a predetermined threshold from incident light and transmits other light varies depending on the incident angle of the incident light and the polarization direction of the light.
  • the threshold value of the wavelength at which transmission and reflection are switched is shown in FIG.
  • the threshold is approximately 610 nm when the incident light is p-polarized light, and is approximately 605 nm when the incident light is s-polarized light.
  • the threshold value of the wavelength at which transmission and reflection are switched is that the incident light is p-polarized light. It differs greatly depending on whether it is s-polarized light. Specifically, the threshold is approximately 480 nm when the incident light is p-polarized light, and is approximately 505 nm when the incident light is s-polarized light.
  • the light incident on the first color separation layer 344 and the second color separation layer 345 from the polarization separation device 323 is p-polarized light, and the modulated light that is modulated and incident by each light modulation device 35 is s-polarized light. .
  • the threshold value when the incident light is p-polarized light from the threshold value when the incident light is s-polarized light (approximately 605 nm). Red light in the wavelength range up to approximately 610 nm) and blue light in the wavelength range from the threshold value (approximately 480 nm) when the incident light is p-polarized light to the threshold value (approximately 505 nm) when the incident light is s-polarized light are polarized It does not return to the separation device 323 and is lost.
  • the dichroic prism 34 When such a dichroic prism 34 is employed and the light incident on the dichroic prism 34 from the polarization separation device 323 contains a lot of blue light in the above wavelength range, the color in the projection image There is a possibility that the balance is not appropriate, and there is a possibility that the brightness of the projection image is lowered.
  • FIG. 3 is a diagram showing the color separation characteristics of the color separation layers 344 and 345 for each type of polarized light when the first color separation layer 344 separates blue light and the second color separation layer 345 separates red light. It is.
  • the transmittances of the p-polarized light and the s-polarized light of the second color separation layer 345 are indicated by fine dotted lines (Tp) and two-dot chain lines (Ts), respectively, and the p-polarized light and s of the first color separation layer 344 are shown.
  • the transmittance of polarized light is indicated by a solid line (Tp) and a large dotted line (Ts), respectively.
  • the threshold difference is small. Specifically, the threshold is approximately 480 nm when the incident light is p-polarized light, and is approximately 495 nm when the incident light is s-polarized light.
  • the second color separation layer 345 having an incident angle of incident light of approximately 40 degrees separates red light
  • the incident light is p-polarized light and s-polarized light
  • the difference between the threshold values becomes large.
  • the threshold is approximately 610 nm when the incident light is p-polarized light, and is approximately 565 nm when the incident light is s-polarized light.
  • the light incident on the color separation layers 344 and 345 from the polarization separation device 323 is p-polarized light
  • the modulated light incident from each light modulation device 35 is s-polarized light.
  • the threshold value when the incident light is p-polarized light from the threshold value when the incident light is s-polarized light (approximately 565 nm) Red light in the wavelength range up to approximately 610 nm) and blue light in the wavelength range from the threshold value (approximately 480 nm) when the incident light is p-polarized light to the threshold value (approximately 495 nm) when the incident light is s-polarized light are polarized It does not return to the separation device 323 and is lost.
  • the light incident on the dichroic prism 34 from the polarization separation device 323 contains a lot of red light in the above wavelength range, the color in the projection image There is a possibility that the balance is not appropriate, and there is a possibility that the brightness of the projection image is lowered.
  • FIG. 4 is a diagram illustrating the wavelength distribution of the emitted light emitted from the illumination device 31.
  • the light emitted from the illumination device 31, that is, the light incident on the dichroic prism 34 is the blue light B and the fluorescence Y including the green light G and the red light R as described above.
  • the blue light B has a peak at about 455 nm as shown by a thick solid line in FIG. 4, and the fluorescence Y is broad from about 475 nm to 700 nm or more as shown by a one-dot chain line in FIG. 4.
  • FIG. 5 shows the wavelength distribution of the emitted light and the color separation characteristics when the first color separation layer 344 separates the blue light and the second color separation layer 345 separates the red light.
  • FIG. 4 When the light having the wavelength distribution shown in FIG. 4 is separated and synthesized by the dichroic prism 34 having the color separation characteristics shown in FIG. 3, blue light having a peak at about 455 nm as shown in FIG. B is separated (reflected) by the first color separation layer 344 without loss.
  • the modulated light (s-polarized light) modulated by the light modulation device 35B is reflected by the second color separation layer 345, the wavelength range from about 565 nm to about 610 nm is reflected.
  • the colored light in the wavelength range does not return to the incident / exit surface 3411 but is emitted toward the polarization separation device 323.
  • the green light G included in the projection image is limited to light having a wavelength range from approximately 490 nm to approximately 565 nm
  • the red light R is limited to light having a wavelength range of approximately 610 nm or more.
  • the blue light B is separated (reflected) by the first color separation layer 344 having a small incident angle of light
  • the red light R is separated (reflected) by the second color separation layer 345 having a large incident angle of light.
  • the dichroic prism 34 to be used when the illuminating device 31 that emits light having the above-described wavelength distribution is adopted, there is a possibility that the loss of light is large, the brightness of the projected image is low, and the color balance of the projected image is not appropriate. is there.
  • FIG. 6 shows the wavelength distribution of the emitted light and the color separation characteristics when the first color separation layer 344 separates red light and the second color separation layer 345 uses a dichroic prism 34 that separates blue light.
  • FIG. 4 when the light having the wavelength distribution shown in FIG. 4 is separated and synthesized by the dichroic prism 34 having the color separation characteristics shown in FIG. 2, a peak appears at about 455 nm as shown in FIG. The blue light B is separated (reflected) by the second color separation layer 345 without loss.
  • the wavelength range in which the loss occurs in the first color separation layer 344 (wavelength range from about 605 nm to about 610 nm) is relatively narrow.
  • the light loss is small.
  • the first color separation layer 344 having a small incident angle of light
  • the second color separation layer 345 having a large incident angle of light.
  • the illumination device 31 that emits light with the above-described wavelength distribution
  • red light is separated (reflected) by the first color separation layer 344 and blue by the second color separation layer 345.
  • the dichroic prism 34 from which light is separated (reflected), the effect can be suitably achieved.
  • the projector 1 according to the present embodiment described above has the following effects.
  • the color lights separated by the first color separation layer 344 and the second color separation layer 345 having different light incident angles are incident on the first color separation layer 344 and incident light on the second color separation layer 345. It is set based on the incident angle and the wavelength distribution of the light emitted from the light source device 31A. According to this, based on the incident angle of the light with respect to each color separation layer 344,345, the color separation characteristic for every polarized light of each said color separation layer 344,345 can be grasped
  • the color light separated by the first color separation layer 344 and the second color separation layer 345 is separated from the emitted light of the light source device 31A. Then, it can be set so that the loss of light when the modulated color lights are combined is reduced. Therefore, the utilization efficiency of the light emitted from the light source device 31A and projected as an image can be improved, and the brightness of the projected image can be increased.
  • the first color separation layer 344 is configured to separate the color light from the light emitted from the illumination device 31 by reflecting the red light R and transmitting the blue light B and the green light G. According to this, the first color separation layer 344 and the second color separation layer 344 and the second color separation layer 344 are arranged along the central axis (illumination optical axis Ax) of light emitted from the illumination device 31 (light source device 31A) and incident through the incident / exit surface 3411.
  • the color separation layer 345 can be arranged in series, whereby the first prism 341, the second prism 342, and the third prism 343 can be arranged in series along the central axis.
  • the second prism 342 is arranged on the traveling direction side of the first color light transmitted through the first color separation layer 344, and the second color light and the third color light reflected by the first color separation layer 344 are arranged.
  • the dichroic prism 34 can be made more compact than when the second prism 342 and the third prism 343 are arranged apart from each other. Can be configured. Therefore, the small dichroic prism 34 can be adopted, and the projector 1 can be downsized.
  • the red light R of the green light G and the red light R having a small peak wavelength interval is separated by the second color separation layer 345 having a large incident angle of light, as described above, of the p-polarized light and the s-polarized light
  • the p-polarized light aligned by the polarization conversion element 318 is incident on the dichroic prism 34, and the s-polarized light that is modulated light modulated by each light modulator 35 is combined and emitted by the dichroic prism 34, green light is emitted.
  • At least one color light of the light G and the red light R is lost. This lost light is not incident on the projection optical device 36, and the utilization efficiency of the light is reduced.
  • the first color separation layer 344 having a small incident angle of light (the first color separation layer 344 having a small difference in color separation characteristics between p-polarized light and s-polarized light) has a small interval between the peak wavelengths.
  • the red light R out of the red light R it is possible to reduce light loss when separating and synthesizing each color light B, G, R. Therefore, the light use efficiency can be improved reliably, and the brightness of the projected image can be increased.
  • the wavelength widths of the green light G and the red light R included in the fluorescence Y that is emitted when the blue light B, which is excitation light, enters the phosphor layer 3132 is relatively wide, and the luminance between peak wavelengths is also high. Therefore, when the red light R is separated (reflected) by the second color separation layer 345 having a large incident angle of light (the second color separation layer 345 having a large difference in color separation characteristics between p-polarized light and s-polarized light), The loss of at least one of the green light G and the red light R increases.
  • the red light R is reflected and separated by the first color separation layer 344 having a small incident angle of light (the first color separation layer 344 having a small difference in color separation characteristics between p-polarized light and s-polarized light).
  • the loss of green light G and red light R can be reduced. Therefore, the light utilization efficiency can be improved reliably, and the brightness of the projected image can be reliably increased.
  • the emitted light whose polarization direction is aligned by the polarization conversion element 318 can be made incident on the dichroic prism 34 and thus on each light modulation device 35 (35R, 35G, 35B), the light use efficiency is further enhanced. Can do.
  • the emitted light whose polarization direction is aligned by the polarization conversion element 318 passes through the polarization separation device 323 and enters the dichroic prism 34, and the modulated light of each light modulation device 35 emitted from the dichroic prism 34 is The polarized light separation device 323 reflects the light toward the projection optical device 36.
  • the projector 1 can be reduced in size.
  • each light modulation device 35 is a reflection type light modulation device, the light emitted from each emission surface 3412, 3421, 3431 is modulated by each light modulation device 35, and again each emission surface 3412, 3421, The optical path to be incident on 3431 can be shortened. Therefore, the projector 1 can be further downsized.
  • the dichroic prism 34 is constituted by a so-called gapless prism, and the red light R reflected by the first color separation layer 344 is totally reflected by the incident / exit surface 3411 of the first prism 341 and corresponding light modulation device 35R. Led to. Further, the blue light B reflected by the second color separation layer 345 passes through the second prism 342, is guided to the corresponding light modulation device 35B, and is transmitted through the second color separation layer 345. G passes through the third prism 343 and is guided to the corresponding light modulation device 35G.
  • the dichroic prism 34 does not require a gap that is difficult to control that is required when the dichroic prism 34 is configured by a so-called Philips prism.
  • the projector according to the present embodiment has a configuration similar to that of the projector 1, and the configuration of the illumination device is different from the color light separated by the first color separation layer 344 and the second color separation layer 345. In these respects, the projector according to the present embodiment is different from the projector 1 described above. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.
  • FIG. 7 is a diagram illustrating the wavelength distribution of the emitted light from the illumination device 31 included in the projector according to the present embodiment.
  • the projector according to the present embodiment has the same configuration and function as the projector 1 except that the configurations of the illumination device 31 and the dichroic prism 34 are different.
  • the illumination device 31 is not configured to include the light source device 31A that converts the wavelength of the blue light as the excitation light emitted from the solid light source device 311 into green light and red light, but each color of red, green, and blue
  • a light source device having three types of LDs (Laser Diodes) that emit light is provided. Specifically, as shown in FIG.
  • these three types of LDs include blue light B having a peak at about 445 nm, green light G having a peak at about 525 nm, and red light R having a peak at about 638 nm, , Is emitted. Then, these three colored lights B, G, R are incident on the relay device 32 via the homogenizing device 31B.
  • the dichroic prism 34 having the color separation characteristics shown in FIG. 2 and the color separation characteristics shown in FIG. Regardless of which of the dichroic prisms 34 is employed, the respective color lights B, G, and R can be separated. However, since the wavelength of light emitted by the LD varies depending on the temperature, it is preferable that the peak wavelength of each color light is separated from the threshold values of the first color separation layer 344 and the second color separation layer 345.
  • the dichroic prism 34 having the color separation characteristics shown in FIG. 3 is employed. That is, in this case, the first color separation layer 344 having a small incident angle of light reflects and separates the blue light B, and the second color separation layer 345 having a large incident angle of light reflects the red light R. A separating dichroic prism 34 is employed.
  • FIG. 8 is a diagram showing the wavelength distribution of the emitted light of the illumination device 31 and the color separation characteristics of the dichroic prism 34 employed according to the illumination device 31 in the present embodiment.
  • the peak wavelength of each color light B, G, R is set to the first color separation layer as compared with the case where the dichroic prism 34 having the color separation characteristics shown in FIG. 344 and the second color separation layer 345 can be separated from the threshold values. Therefore, when the three color lights are separated from the light emitted from the illumination device 31 and the modulated lights of the respective color lights are combined, the light loss can be reduced, and the decrease in the brightness of the projected image can be suppressed.
  • blue light B and green light G having a smaller peak interval than G and red light R, blue light B is reflected and separated. According to this, even when the peak wavelengths of the respective color lights are shifted, the loss of the blue light B and the green light G can be reduced. Therefore, the light utilization efficiency can be improved reliably, and the brightness of the projected image can be reliably increased.
  • the projector according to this embodiment has the same configuration as the projector 1 described above.
  • a light source device having an LD having a relatively narrow wavelength range of the peak of emitted light is employed.
  • a light source device having an LED (Light Emitting Diode) having a slightly wider wavelength range of the peak of emitted light is employed.
  • the projector according to the present embodiment is different from the projector 1 described above.
  • parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.
  • FIG. 9 is a diagram illustrating the wavelength distribution of light emitted from the illumination device 31 included in the projector according to the present embodiment and the color separation characteristics of the dichroic prism 34 employed according to the illumination device 31.
  • the projector according to the present embodiment has the same configuration and function as the projector 1 except that the configurations of the illumination device 31 and the dichroic prism 34 are different.
  • the illuminating device 31 includes a light source device having three color solid-state light sources, like the illuminating device 31 in the second embodiment, and the three-color solid light sources are light beams of red, green and blue. Are LEDs that respectively emit light. As shown in FIG.
  • these three colors of LED are blue light B having a peak wavelength at about 460 nm, green light G having a peak wavelength at about 525 nm, and red light having peak wavelengths at about 613 nm and about 623 nm.
  • R R1, R2 is emitted.
  • these three colored lights B, G, R are incident on the relay device 32 via the homogenizing device 31B.
  • the red, green, and blue color lights B, G, and R have a wider wavelength width than the red, green, and blue color lights B, G, and R emitted from the LD.
  • the dichroic prism 34 having the color separation characteristics shown in FIG. 2 As in the case where the illuminating device 31 having the three color LDs is employed, and Each of the color lights B, G, and R can be separated by any of the dichroic prisms 34 having the color separation characteristics shown in FIG.
  • the peak wavelengths of the color lights B, G, R are determined by the first color separation layer 344 and the second color separation. It is preferable to move away from the threshold of layer 345.
  • the width between the peak wavelength of the blue light B (approximately 460 nm) and the peak wavelength of the green light G (approximately 525 nm) is greater than that of the green light G. Since it is narrower than the width between the peak and the peak wavelength (approximately 613 nm and approximately 623 nm) of the red light R (R1, R2), the dichroic prism 34 having the color separation characteristics shown in FIG. 3 is employed. That is, in this case, the first color separation layer 344 having a small incident angle of light reflects and separates the blue light B, and the second color separation layer 345 having a large incident angle of light reflects the red light R. A separating dichroic prism 34 is employed.
  • the peak wavelength of each color light B, G, R is set to the first color separation layer as compared with the case where the dichroic prism 34 having the color separation characteristics shown in FIG. 344 and the second color separation layer 345 can be separated from the threshold values. Therefore, similarly to the above, it is possible to separate the three color lights B, G, R from the light emitted from the illumination device 31 and reduce the light loss when combining the modulated lights of the respective color lights B, G, R, A decrease in the brightness of the projected image can be suppressed. According to the projector according to the present embodiment described above, the same effect as that of the projector shown in the second embodiment can be obtained. In addition, you may employ
  • the dichroic prism 34 as the color separation / combination device is a so-called gapless prism.
  • the present invention is not limited to this.
  • the dichroic prism 34 may be a dichroic prism having another shape, or may be a so-called Philips prism.
  • FIG. 10 is a schematic diagram showing a dichroic prism 37 composed of a Philips prism.
  • the dichroic prism 37 composed of the Philips prism is similar to the dichroic prism 34 composed of the gapless prism, as shown in FIG. 10, and the first color 371, the second prism 372, the third prism 373, and the first color.
  • a separation layer 374 and a second color separation layer 375, and the prisms 371 to 373 are combined.
  • the first prism 371 is formed in a substantially triangular prism shape, and is disposed at a position closest to the polarization separation device 323 among the first to third prisms 371 to 373.
  • the first prism 371 has an incident / exit surface 3711 orthogonal to the illumination optical axis Ax, and the light that has passed through the polarization separation device 323 enters the first prism 371 through the incident / exit surface 3711.
  • a first color separation layer 374 is disposed between the first prism 371 and the second prism 372 joined to the first prism 371 so as to be inclined with respect to the illumination optical axis Ax. Yes. Specifically, the first color separation layer 374 is formed on the surface of the first prism 371 opposite to the incident / exit surface 3711.
  • the first color separation layer 374 reflects light of a predetermined threshold value or more and transmits light of other wavelengths. For example, when the first color separation layer 374 is configured to reflect the blue light B and transmit the green light G and the red light R out of the incident light, the first color separation layer 374 reflects the first light.
  • the blue light B is incident on the incident / exit surface 3711 from the inside of the first prism 371 at an angle greater than the critical angle. Then, the blue light B is incident from the emission surface 3712 (first emission surface) of the first prism 371 to the blue light light modulation device 35B (not shown) facing the emission surface 3712.
  • the green light G and the red light R incident on the first color separation layer 374 pass through the first color separation layer 374 and are further formed between the first prism 371 and the second prism 372. It passes through the gap GP and enters the second prism 372.
  • the second prism 372 is formed in a substantially triangular prism shape, and is disposed between the first prism 371 and a gap GP of about several ⁇ m.
  • a second color separation layer 375 is disposed between the second prism 372 and the third prism 373 so as to be inclined to the opposite side of the first color separation layer 374 with respect to the illumination optical axis Ax. ing. Similar to the second color separation layer 345, the second color separation layer 375 has a threshold value different from or different from that of the first color separation layer 374 out of light incident from the first prism 371 through the gap GP. Reflects light and transmits light of other wavelengths.
  • the second color separation layer 375 when the second color separation layer 375 is configured to reflect the red light R and transmit the green light G out of the incident green light G and red light R, the second color separation layer 375.
  • the red light R reflected by the light enters the end surface 3721 facing the first prism 371 from the inside of the second prism 372 at an angle greater than the critical angle.
  • the red light R enters the light modulation device 35R (not shown) for red light facing the emission surface 3722 from the emission surface 3722 (second emission surface) of the second prism 372.
  • the green light G that has passed through the second color separation layer 375 enters the third prism 373 that is joined to the second prism 372 without any gap.
  • the third prism 373 is formed in a quadrangular prism shape with a substantially trapezoidal cross section.
  • the third prism 373 has an exit surface 3731 parallel to the incident / exit surface 3711, that is, an exit surface 3731 orthogonal to the illumination optical axis Ax, on the side opposite to the surface on which light is incident from the second prism 372. .
  • the green light G incident on the third prism 373 enters the light modulating device 35G (not shown) for green light opposed to the emission surface 3731 from the emission surface 3731 (third emission surface).
  • the color lights B, G, R modulated by the light modulation devices 35B, 35G, 35R follow the incident paths of the color lights B, G, R to the light modulation devices 35B, 35G, 35R in reverse.
  • the incident / exit surface 3711 toward the polarization beam splitter 323 are combined and output from the incident / exit surface 3711 toward the polarization beam splitter 323 as combined light.
  • the first color separation layer 374 and the second color separation layer 375 intersect the illumination optical axis Ax at different angles, respectively, and light of each color separation layer 374, 375 is transmitted.
  • the incident angles are also different.
  • the first color separation layer 374 is inclined so that the incident angle of light incident along the illumination optical axis Ax is ⁇ 28 degrees
  • the second color separation layer 375 It is inclined so that the incident angle of light incident along the optical axis Ax is +11 degrees.
  • the first color separation layer 374 and the second color separation layer are formed as in the case where the dichroic prism 34 composed of a gapless prism is employed.
  • 375 has different color separation characteristics for each type of incident linearly polarized light.
  • the incident angle of light to each of the color separation layers 374 and 375 and the illumination device 31 (specifically, a light source device) used in the projector.
  • the same effect as the projector 1 can be obtained. .
  • the dichroic prism 37 constituted by the Philips prism, it is necessary to dispose the gap GP of about several ⁇ m, but the light reflected by the second color separation layer 375 is reflected by the second prism 372.
  • the dichroic prism 34 constituted by the gapless prism the light having a large incident angle with respect to the color separation layer is reflected on the inner surface by the surface facing the first prism 371 and guided to the corresponding light modulation device 35.
  • the incident angle of light with respect to the two-color separation layer 345 can be reduced. Therefore, the dichroic prism 37 has better color separation characteristics for each type of linearly polarized light than the dichroic prism 34.
  • the dichroic prism 34 can be easily manufactured because the gap GP required by the dichroic prism 37 is unnecessary as described above.
  • a first prism having an incident / exit surface on which light emitted from the illumination device 31 is incident and a first prism disposed opposite to the first prism are arranged. 2 prisms and a third prism that also faces the first prism, the first color separation layer is located between the first prism and the second prism, and between the first prism and the third prism. And a dichroic prism in which the second color separation layer is located.
  • the first color light is relative to the central axis of the illumination light.
  • the first color separation layer that is inclined can be transmitted, and the second color light and the third color light can be reflected by the first color separation layer.
  • the first color light transmitted through the first color separation layer is incident on the second prism, and is internally reflected in the second prism as necessary, and then the emission surface (second emission surface) of the second prism. ) To the corresponding light modulation device.
  • the second color light and the third color light reflected by the first color separation layer are internally reflected in the first prism as necessary (for example, after being internally reflected on the incident / exit surface), It can be made to enter into the 2nd color separation layer (the 2nd color separation layer located in the entrance side of the 2nd color light and the 3rd color light in the 3rd prism) inclined with respect to the central axis of the 2nd color light and the 3rd color light .
  • One of the second color light and the third color light incident on the second color separation layer is reflected by the second color separation layer, and further, if necessary, after being internally reflected in the first prism.
  • the light is emitted from the emission surface (first emission surface) of the first prism to the corresponding light modulation device, and the other light is transmitted through the second color separation layer and incident on the third prism.
  • it can be configured to be emitted from the emission surface (third emission surface) of the third prism to the corresponding light modulation device.
  • each color light modulated in the process of being reflected by each light modulation device is synthesized by tracing back the optical path incident on each light modulation device and emitted from the incident / exit surface of the first prism.
  • the projector can adopt a configuration in which the first color separation layer transmits the first color light and reflects the second color light and the third color light.
  • each color separation layer inclined with respect to the central axis of the incident light that is, the color light separated by each color separation layer having a different incident angle of light
  • the light modulation device 35 is a reflection type light modulation device.
  • the light modulation device 35 may be a transmission light modulation device such as a transmission light valve.
  • any configuration may be used as long as modulated light from each light modulation device is incident on the emission surface of the dichroic prism from which each color light of blue, green, and red is emitted.
  • the light modulation device is not limited to a liquid crystal light valve, and a light modulation device other than liquid crystal may be used.
  • the optical unit 3 has a configuration having the optical components shown in FIG.
  • the light source device causes a first light source unit that emits blue light from a solid light source such as an LD or LED, and excitation light emitted from a solid light source that is different from the first light source unit to be incident on the phosphor.
  • the second light source unit that emits fluorescence and the light emitted from the first light source unit and the second light source unit may be combined and incident on the uniformizing device 31B.
  • the phosphor layer 3132 is not limited to the configuration formed on the disk 3131 rotated by the motor 314, and may be formed on a fixed substrate.
  • the wavelengths of the blue light, green light, and red light emitted from the light source device 31A shown in each of the above embodiments are examples, and a light source device that emits blue light, green light, and red light of other wavelengths is employed. Also good.
  • the incident angles of light to the first color separation layers 344 and 374 and the second color separation layers 345 and 375 in the dichroic prisms 34 and 37 are not limited to the above, and may be other angles.
  • the polarization conversion element 318 has a configuration in which incident light is aligned with p-polarized light, and the polarization separation device 323 transmits p-polarized light and reflects s-polarized light.
  • the present invention is not limited to this.
  • the polarization conversion element 318 may be configured to align incident light with s-polarized light, and the polarization separation device 323 may transmit s-polarized light and reflect p-polarized light.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

L'invention concerne un projecteur susceptible d'améliorer l'efficacité d'utilisation de lumière. L'invention comprend : un dispositif de source de lumière (31A) ; trois dispositifs de modulation de lumière (35) ; un prisme dichroïque (34) qui sépare trois lumières colorées de la lumière incidente sur l'intérieur par l'intermédiaire d'une surface d'émission/entrée (3411), amène les trois lumières colorées à devenir incidentes sur les dispositifs de modulation de lumière (35) respectifs, synthétise chacune des lumières colorées incidentes dessus à partir des dispositifs de modulation de lumière (35) respectifs et émet la lumière synthétisée à partir de la surface d'émission/entrée (3411) ; et un dispositif optique de projection (36) qui projette la lumière synthétisée. Le prisme dichroïque (34) comprend : des premier à troisième prismes (341 à 343) ; une première couche de séparation de couleurs (344) positionnée entre les premier et deuxième prismes (341, 342) ; et une seconde couche de séparation de couleurs (345) positionnée entre les deuxième et troisième prismes (342, 343). Les angles d'incidence de la lumière sur les couches de séparation de couleurs (344, 345) respectives sont différents l'un de l'autre. Les lumières colorées séparées par les couches de séparation de couleurs (344, 345) respectives sont réglées sur la base des angles d'incidence de la lumière sur les couches de séparation de couleurs (344, 345) respectives et la distribution de longueurs d'onde de la lumière émise par le dispositif de source de lumière (31A).
PCT/JP2016/001077 2015-03-13 2016-02-29 Projecteur WO2016147578A1 (fr)

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US11348981B2 (en) 2019-09-30 2022-05-31 Seiko Epson Corporation Image light generation device and image display device

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JPH10319344A (ja) * 1997-05-19 1998-12-04 Matsushita Electric Ind Co Ltd 投写型表示装置
JP2002162613A (ja) * 2000-11-28 2002-06-07 Seiko Epson Corp プロジェクタ
JP2005208256A (ja) * 2004-01-21 2005-08-04 Fujinon Corp トリミングフィルタ、色分解光学系、色合成光学系、撮像装置および投影装置
WO2007015389A1 (fr) * 2005-08-04 2007-02-08 Matsushita Electric Industrial Co., Ltd. Éclairage et dispositif d'affichage de projection l’employant
JP2012155004A (ja) * 2011-01-24 2012-08-16 Seiko Epson Corp 照明装置およびプロジェクター
JP2013511066A (ja) * 2009-11-11 2013-03-28 イーストマン コダック カンパニー 位相補償型薄膜ビームコンバイナ
JP2014044291A (ja) * 2012-08-27 2014-03-13 Konica Minolta Inc 投射型表示装置
JP2014048392A (ja) * 2012-08-30 2014-03-17 Konica Minolta Inc 色分解合成プリズム

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Publication number Priority date Publication date Assignee Title
JPH10319344A (ja) * 1997-05-19 1998-12-04 Matsushita Electric Ind Co Ltd 投写型表示装置
JP2002162613A (ja) * 2000-11-28 2002-06-07 Seiko Epson Corp プロジェクタ
JP2005208256A (ja) * 2004-01-21 2005-08-04 Fujinon Corp トリミングフィルタ、色分解光学系、色合成光学系、撮像装置および投影装置
WO2007015389A1 (fr) * 2005-08-04 2007-02-08 Matsushita Electric Industrial Co., Ltd. Éclairage et dispositif d'affichage de projection l’employant
JP2013511066A (ja) * 2009-11-11 2013-03-28 イーストマン コダック カンパニー 位相補償型薄膜ビームコンバイナ
JP2012155004A (ja) * 2011-01-24 2012-08-16 Seiko Epson Corp 照明装置およびプロジェクター
JP2014044291A (ja) * 2012-08-27 2014-03-13 Konica Minolta Inc 投射型表示装置
JP2014048392A (ja) * 2012-08-30 2014-03-17 Konica Minolta Inc 色分解合成プリズム

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11348981B2 (en) 2019-09-30 2022-05-31 Seiko Epson Corporation Image light generation device and image display device

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