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WO2018120667A1 - 像素电路及其驱动方法、显示面板 - Google Patents

像素电路及其驱动方法、显示面板 Download PDF

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Publication number
WO2018120667A1
WO2018120667A1 PCT/CN2017/088267 CN2017088267W WO2018120667A1 WO 2018120667 A1 WO2018120667 A1 WO 2018120667A1 CN 2017088267 W CN2017088267 W CN 2017088267W WO 2018120667 A1 WO2018120667 A1 WO 2018120667A1
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Prior art keywords
circuit
signal
transistor
control
short
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Application number
PCT/CN2017/088267
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English (en)
French (fr)
Inventor
岳晗
陈小川
杨盛际
刘冬妮
王磊
付杰
卢鹏程
肖丽
Original Assignee
京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US15/744,476 priority Critical patent/US10643536B2/en
Publication of WO2018120667A1 publication Critical patent/WO2018120667A1/zh

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    • 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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G09G3/3241—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • 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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/10—Dealing with defective pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof

Definitions

  • Embodiments of the present invention relate to a pixel circuit, a driving method thereof, and a display panel.
  • OLED Organic Light-Emitting Diode
  • the OLED device microdisplay structure including the cathode, the anode, and the functional structure film layer between the cathode and the anode, since each film layer of the functional structure film layer is thin, a short circuit between the cathode and the anode is easily caused.
  • the manufacturing process the fabrication process of OLED devices is complicated.
  • the functional structure film layer is thinner, resulting in the cathode and anode of the OLED device. The resistance is small and a short circuit occurs between the anode and the cathode.
  • the defective pixel needs to be removed to suppress a large current formed due to a short circuit between the cathode and the anode of the OLED device.
  • the short-circuit processing method between the cathode and the anode of the OLED device is as follows: first, the pixel of the dead pixel is found by query, and then the laser is ablated to destroy the pixel of the dead pixel. This processing method is not only complicated, but also difficult to remedy if new dead pixels are generated.
  • At least one embodiment of the present disclosure provides a pixel circuit and a driving method thereof, and a display panel capable of at least automatically detecting an input signal of a light emitting device and solving a pixel abnormality caused by a short circuit between a cathode and an anode of the light emitting device. The problem.
  • At least one embodiment of the present disclosure provides a pixel circuit including a driving circuit, a lighting circuit, and a short circuit protection circuit, the short circuit protection circuit being disposed in series between the driving circuit and the lighting circuit, and configured to acquire An input signal of the illumination circuit is described, and an input signal branch of the illumination circuit is cut or turned on according to the obtained input signal of the illumination circuit.
  • the short circuit protection circuit includes a short circuit protection transistor and a signal control circuit.
  • the signal control circuit has an input end connected to an input end of the light emitting circuit, an output end connected to a control electrode of the short circuit protection transistor, and configured to acquire an input end signal of the light emitting circuit, and output a short circuit a control signal;
  • the short circuit protection transistor having a first pole coupled to an output of the driver circuit, a second pole coupled to an input of the lighting circuit, and configured to be responsive to said signal control circuit output Shorting the control signal to cut or turn on the input signal branch of the lighting circuit.
  • the signal control circuit includes a determination control circuit having an input end connected to an input end of the light emitting circuit and an output end connected to a control electrode of the short circuit protection transistor. And configured to acquire an input signal of the light emitting circuit and output the short circuit control signal when the light emitting circuit is in a working phase.
  • the signal control circuit further includes a precharge path.
  • the precharge path is connected in series between the control circuit and the control electrode of the short circuit protection transistor, and is configured to control the short circuit protection transistor to be in an on state when the light emitting circuit is in a non-operating phase, and is further configured to be in the light emitting circuit While in the working phase, the short circuit control signal is transmitted to the gate of the short circuit protection transistor.
  • the determination control circuit includes a first determination transistor and a second determination transistor.
  • a control electrode of the first determining transistor is connected to an input end of the light emitting circuit, a first pole is connected to the first level signal, and a second pole is connected to the second pole of the second determining transistor;
  • the control electrode of the determining transistor is further connected to the input end of the light emitting circuit, the first pole is connected to the second level signal, and the second pole is connected to the control pole of the short circuit protection transistor; the first determining transistor and the The second type of transistor is opposite.
  • the precharge path includes a first precharge transistor, a second precharge transistor, a third precharge transistor, and a precharge capacitor.
  • a control electrode of the first pre-charge transistor is connected to the first control signal terminal, a first electrode is connected to the third level signal, and a second electrode is connected to the control electrode of the short-circuit protection transistor;
  • the second pre-charge transistor The control electrode is connected to the second control signal terminal, the first pole is connected to the fourth level signal, the second pole is connected to the second pole of the third precharge transistor, and the control pole of the third precharge transistor is The third control signal end is connected, the first pole is connected to the output end of the determining control circuit; the first end of the pre-charging capacitor is connected to the control pole of the short-circuit protection transistor, and the second end is opposite to the third pre- The second pole of the charging transistor is connected.
  • a pixel circuit provided by an example of the present disclosure further includes a switching circuit configured to be turned on, The data signal is transmitted to the control terminal of the drive circuit.
  • the light emitting circuit is an organic electroluminescent device having an anode connected to an input end of the short circuit protection circuit and a cathode connected to the ground.
  • At least one embodiment of the present disclosure further provides a driving method of a pixel circuit, comprising: inputting a data signal to a control end of the driving circuit, and outputting the same to the lighting circuit through the driving circuit a illuminating signal corresponding to the data signal, wherein the illuminating signal is an input signal of the illuminating circuit; wherein the working phase comprises a short circuit detecting phase, and in the short circuit detecting phase, the illuminating circuit is obtained by the short circuit protection circuit And input signal of the light-emitting circuit is cut off or turned on according to an input signal of the light-emitting circuit.
  • the signal control circuit acquires an input signal of the light-emitting circuit, and outputs the short-circuit control signal, and the short-circuit protection transistor is according to the The short circuit control signal output by the signal control circuit cuts off or turns on an input signal branch of the light emitting circuit.
  • the driving method of the pixel circuit further includes: in a non-working phase, outputting a signal through a precharge path to turn on the short circuit protection transistor; and in the short circuit detection phase, acquiring the Inputting a signal of the input end of the light emitting circuit, and outputting the short circuit control signal, and transmitting the short circuit control signal to the control electrode of the short circuit protection transistor through the precharge path, thereby cutting off or turning on the input signal of the light emitting circuit Branch road.
  • At least one embodiment of the present disclosure further provides a display panel comprising the pixel circuit of any of the above.
  • FIG. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of a pixel circuit according to another embodiment of the present disclosure.
  • FIG. 3 is a schematic structural diagram of a pixel circuit according to another embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a pixel circuit according to still another embodiment of the present disclosure.
  • FIG. 5 is a timing diagram of the pixel circuit shown in FIG. 4 of the present disclosure.
  • the embodiment provides a pixel circuit, which can perform automatic short circuit protection.
  • a short circuit occurs between the cathode and the anode of the light emitting device
  • the closed loop that controls the light emitting of the driving light emitting device is disconnected to provide short circuit protection.
  • the function is to avoid the problem of pixel abnormality caused by a short circuit between the cathode and the anode of the light-emitting device.
  • the structure of the pixel circuit is simple and stable, and the driving method of the pixel circuit is simple and easy.
  • the pixel circuit may include a driving circuit 2, a light emitting circuit 3, and a short circuit protection circuit 4.
  • the short circuit protection circuit 4 is disposed in series between the driving circuit 2 and the light emitting circuit 3, and is configured to acquire an input signal of the light emitting circuit 3, and cause the short circuit protection circuit 4 to be disconnected according to the input signal of the obtained light emitting circuit 3 or Turning on, thereby cutting or turning on the input signal branch of the light-emitting circuit 3 to prevent a short circuit between the anode and the cathode inside the light-emitting circuit 3 from affecting the light-emitting state of the light-emitting circuit 3.
  • the drive circuit 2 is configured to drive the light-emitting circuit 3 to emit light, which can transmit a light-emitting signal corresponding to the data signal to the light-emitting circuit 3, thereby driving the light-emitting circuit 3 to emit light.
  • the illuminating signal can be, for example, a current signal.
  • the pixel circuit further includes a switching circuit 1 configured to transmit a data signal to a control terminal of the driving circuit 2 to control a current flowing through the driving circuit 2 when turned on. size.
  • the short circuit protection circuit 4 may include a short circuit protection transistor Q3 and a signal control circuit 41.
  • the signal control circuit 41 has an input end connected to the input end of the light-emitting circuit 3, an output end connected to the control electrode of the short-circuit protection transistor Q3, and configured to acquire an input signal of the light-emitting circuit 3 and output a short-circuit control signal to the short circuit.
  • the control electrode of the protection transistor Q3; the short-circuit protection transistor Q3 has a first pole connected to the output end of the driving circuit 2, a second pole connected to the input end of the light-emitting circuit 3, and configured to be short according to the output of the signal control circuit 41
  • the circuit control signal cuts off or turns on the input signal branch of the light-emitting circuit 3 to provide short-circuit protection.
  • the signal control circuit 41 includes a judgment control circuit 411.
  • the input end of the judgment control circuit 411 is connected to the input end of the light-emitting circuit 3, the output end is connected to the control pole of the short-circuit protection transistor Q3, and is configured to acquire the input end signal of the light-emitting circuit 3 when the light-emitting circuit 3 is in the working stage, According to the input signal of the light-emitting circuit 3, it is judged whether a short-circuit phenomenon occurs between the anode and the cathode when the light-emitting circuit 3 is in the working phase, and different short-circuit control signals are output according to the judgment result.
  • the first short-circuit control signal is output to control the short-circuit protection transistor Q3 to be turned off, thereby cutting off the input signal branch of the light-emitting circuit 3; when it is judged that the short-circuit phenomenon has not occurred in the light-emitting circuit 3, the output is The short-circuit control signal is controlled to control the short-circuit protection transistor Q3 to be turned on, so that the input signal branch of the light-emitting circuit 3 is maintained in an on state.
  • the signal control circuit 41 also includes a pre-charge path 412.
  • the precharge path 412 is connected in series between the determination control circuit 411 and the short circuit protection transistor Q3, and is configured to transmit an on signal to the gate of the short circuit protection transistor Q3 to turn on the short circuit protection transistor when the light emitting circuit 3 is in an inactive phase.
  • Q3 is also configured to transmit a short circuit control signal to the gate of the short circuit protection transistor Q3 when the light emitting circuit 3 is in the active phase.
  • the pre-charging circuit 412 controls the short-circuit protection transistor Q3 to be in an on state when the lighting circuit 3 is in a non-operating phase, thereby ensuring that the input signal branch is in an on state when the lighting circuit 3 is in an initial working phase, so that the illuminating signal can be transmitted.
  • the light-emitting circuit 3 is driven to emit light to prevent erroneous determination by the determination control circuit 411.
  • the light emitting circuit 3 may include an organic electroluminescent device (ie, an OLED device).
  • the anode of the OLED device is connected to the short circuit protection circuit 4, and the cathode is connected to the ground terminal VSS.
  • the input signal terminal of the light-emitting circuit 3 receives the light-emitting signal and emits light corresponding to the light-emitting signal.
  • the switching circuit 1 includes a first transistor Q1.
  • the first transistor Q1 may also be referred to as a switching transistor Q1.
  • the control electrode of the first transistor Q1 is connected to the switch signal end (the switch signal end, that is, the scan signal input end Gate), and the first pole is connected with the data signal end (the data signal end, that is, the data signal input end Data), and the second pole and the drive circuit 2 The input is connected.
  • the switch signal terminal applies a scan signal to the control electrode of the first transistor Q1 to turn on the first transistor Q1
  • the data signal transmitted by the data signal terminal can be written to the control terminal of the drive circuit 2 via the first transistor Q1, thereby controlling
  • the drive circuit 2 (for example, the second transistor Q2) is turned on or off.
  • the drive circuit 2 includes a second transistor Q2 and a storage capacitor C1.
  • the second transistor Q2 may also be referred to as a drive transistor Q2.
  • the first end and the second crystal of the storage capacitor C1 The control electrode of the body tube Q2 is connected, the second end is connected to the first pole of the second transistor Q2, the control electrode of the second transistor Q2 is connected to the output end of the switch circuit 1, the first pole is connected to the working voltage VDD, and the second pole is connected. Connected to the input of the short circuit protection circuit 4.
  • the control electrode of the second transistor Q2 can be used, for example, as the control terminal of the driving circuit 2, that is, the data signal transmitted by the switching circuit 1 can be written to the control electrode of the second transistor Q2, and the storage capacitor C1 is configured to store the data signal and Maintained in control of the second transistor Q2, the data signal can control the degree of conduction of the second transistor Q2, thereby controlling the magnitude of the current flowing through the second transistor Q2.
  • the current flowing through the second transistor Q2 can be transmitted to the lighting circuit 3 to drive its illumination, and the current flowing through the second transistor Q2 can determine the gray scale of the pixel illumination.
  • the driving circuit 2 may further include a transfer transistor, a detection transistor, a reset transistor, and the like as needed, and the embodiment of the present disclosure does not limit the specific structure of the driving circuit 2.
  • the judgment control circuit 411 includes a first determination transistor Q4 and a second determination transistor Q5.
  • the control electrode of the first determining transistor Q4 is connected to the input end of the light-emitting circuit 3, the first pole is connected to the first level signal V1, the second pole is connected to the second pole of the second determining transistor Q5, and the second determining transistor Q5 is The control electrode is connected to the input terminal of the light-emitting circuit 3, the first electrode is connected to the second level signal V2, and the second electrode is connected to the control electrode of the short-circuit protection transistor Q3.
  • the types of the first determining transistor and the second determining transistor are opposite, that is, if the first determining transistor is an N-type transistor, the second determining transistor is a P-type transistor; or, if the first determining transistor is a P-type transistor, then The second determining transistor is an N-type transistor.
  • the precharge path 412 includes a first precharge transistor Q6, a second precharge transistor Q7, a third precharge transistor Q8, and a precharge capacitor C2.
  • the control electrode of the first pre-charge transistor Q6 is connected to the first control signal terminal S1, the first electrode is connected to the third level signal V3, the second electrode is connected to the control electrode of the short-circuit protection transistor Q3, and the second pre-charge transistor Q7 is The control electrode is connected to the second control signal terminal S2, the first pole is connected to the fourth level signal V4, the second pole is connected to the second pole of the third pre-charge transistor Q8, and the control pole of the third pre-charge transistor Q8 is The third control signal terminal S3 is connected, the first pole is connected to the output end of the judgment control circuit 411; the first end of the precharge capacitor C2 is connected to the control pole of the short circuit protection transistor Q3, and the second end is connected to the third precharge transistor Q8. Two pole connection.
  • the control electrode of the transistor corresponds to the gate of the thin film transistor
  • the first and second poles are the source and the drain of the thin film transistor, respectively. (or drain and source).
  • the first pole and the second pole are interchangeable as needed, that is, the first pole may be a source or a drain, and correspondingly, the second pole may be The drain can also be the source.
  • the first transistor Q1, the second transistor Q2, the first determining transistor Q4, the first pre-charging transistor Q6, the second pre-charging transistor Q7, and the third pre-charging transistor Q8 are P-type thin film transistors.
  • the second determining transistor Q5 and the short-circuit protecting transistor Q3 are N-type thin film transistors.
  • the thin film transistors Q1 - Q8 in the pixel circuit can be mixed with an N-type thin film transistor and a P-type thin film transistor, and the control electrodes of the selected types of thin film transistors Q1 - Q8 need only be adjusted accordingly.
  • the level of the control voltage can be.
  • the N-type transistor is in an on state when the control voltage of the gate is at a high level; and a P-type transistor is in a P-type transistor when the control voltage of the gate is at a low level Open state.
  • the types of the transistors Q1 - Q8 in the pixel circuit of the present embodiment are not limited to thin film transistors, and any transistor having voltage control capability having the same process as that in the pixel circuit is employed to make the present disclosure work as described above.
  • the working pixel circuits should all be included in the protection scope of the present disclosure.
  • the transistors Q1 - Q8 may be Field Effect Transistors (FETs), and more specifically may be metal oxide semiconductor field effect transistors (Metal Oxide).
  • FETs Field Effect Transistors
  • Metal Oxide metal oxide semiconductor field effect transistors
  • MOS FET semiconductor field effect Transistor
  • transistors Q1, Q3, Q4, Q5, Q6, Q7, and Q8 are switching transistors, and transistor Q2 is a driving transistor.
  • the pixel circuit in this embodiment uses a 2T1C circuit to implement the basic function of driving the illumination circuit 3 (for example, an OLED device).
  • the pixel circuit can also have an electrical compensation function to enhance The display uniformity of the display panel including the pixel circuit.
  • the compensation function can be implemented by voltage compensation, current compensation or hybrid compensation, and the pixel circuit with compensation function can be implemented, for example, as 4T1C, 4T2C, 6T1C, and other circuits with electrical compensation functions.
  • FIG. 5 is a timing chart of the pixel circuit shown in FIG.
  • one frame can be divided into two phases A and B, the A phase is the non-working phase of the lighting circuit 3, and B is the working phase of the lighting circuit 3.
  • the first control signal terminal S1 and the second control signal terminal S2 When the lighting circuit 3 is in the non-working phase A, the first control signal terminal S1 and the second control signal terminal S2 output an active level signal before the valid signal of the switching signal terminal Gate comes, thereby causing the first pre-charging transistor Q6 and The second pre-charge transistor Q7 is turned on, and the third control signal terminal S3 outputs an inactive level signal, thereby causing the third pre-charge transistor Q8 to be turned off, the third level signal V3 and the The four-level signal V4 is respectively transmitted to both ends of the pre-charging capacitor C2, and the level value of the third-level signal V3 can turn on the short-circuit protection transistor Q3, and the voltage difference across the pre-charging capacitor C2 is V3-V4.
  • the effective signal of the switch signal terminal Gate comes, the light-emitting signal is transmitted to the light-emitting circuit 3 through the short-circuit protection transistor Q3, and the light-emitting circuit 3 operates, and at the same time, the first control signal terminal S1 and the second control The signal terminal S2 outputs an invalid level signal such that the first pre-charge transistor Q6 and the second pre-charge transistor Q7 are turned off, and the third control signal terminal S3 outputs an active level signal, thereby causing the third pre-charge transistor Q8 to be turned on.
  • the anode signal of the OLED device is a high level signal
  • the first determining transistor Q4 is turned off
  • the second determining transistor Q5 is turned on
  • the second level signal V2 is transmitted to The second end of the pre-charging capacitor C2, through the capacitor bootstrap action, the level signal value of the first end of the pre-charging capacitor C2 becomes V3-V4+V2, and the level signal is used as the control electrode of the short-circuit protection transistor Q3.
  • the signal can ensure that the short-circuit protection transistor Q3 is turned on, so that when the light-emitting circuit 3 is in a normal operating state, the short-circuit protection transistor Q3 is turned on, so that the input signal branch of the light-emitting circuit 3 is turned on.
  • the anode signal of the OLED device is a low level signal
  • the first determining transistor Q4 is turned on
  • the second determining transistor Q5 is turned off
  • the first level signal V1 is transmitted to the pre The second end of the charging capacitor C2, through the capacitor bootstrap action, the level signal value of the first end of the pre-charging capacitor C2 becomes V3-V4+V1, and the level signal serves as a control signal for the gate of the short-circuit protection transistor Q3.
  • the short-circuit protection transistor Q3 can be turned off, so that when the light-emitting circuit 3 is in a short-circuit state, the input signal branch of the light-emitting circuit 3 is cut off.
  • the first level signal V1, the second level signal V2, the third level signal V3, and the fourth level signal V4 take values. Meet the following relationship:
  • Vth3 is the threshold voltage of the short-circuit protection transistor Q3
  • Vanode1 is the input signal when the light-emitting circuit 3 is in the non-operating phase, that is, the anode signal is approximately the voltage value close to VSS
  • Vanode2 is normal when the light-emitting circuit 3 is in the working phase.
  • the input signal of the working state that is, the anode signal is a high level signal at this time
  • Vanode3 is an input signal of the short circuit state of the lighting circuit 3 during the working phase, that is, the anode signal is VSS at this time.
  • the effective level signal outputted by the first control signal terminal S1 satisfies the first pre-charge transistor Q6, and the active-level signal outputted by the second control signal terminal S2 satisfies the second pre-charge transistor Q7, and the third control signal
  • the active level signal outputted by terminal S3 is satisfied to turn on the third pre-charge transistor Q8.
  • the short circuit protection circuit 4 is added to perform automatic short circuit protection on the OLED device.
  • the anode voltage of the OLED device is at a high level, and if a short circuit occurs between the cathode and the anode of the OLED device, the anode voltage becomes a low level.
  • the OLED device is connected in series as an ohm-ohm resistor in the illuminating branch (VDD-VSS branch). If a short circuit occurs between the cathode and the anode, the resistance of the OLED device is reduced or even reduced to 0 ohm.
  • the NMOS device that is short-circuited has a significantly lower anode voltage than an OLED device that has not been short-circuited.
  • the anode voltage of the OLED device is monitored by the switching transistor in the short circuit protection circuit 4, and the anode voltage is obtained in real time. Once the anode voltage is changed to a low level, the closed loop of the OLED device is controlled to be turned off (for example, short circuit protection is controlled). Transistor Q3 is turned off, thereby providing automatic short circuit protection.
  • the pixel circuit controls the closed loop of the light emitting device to be turned off by the short circuit protection circuit, avoiding the problem of pixel abnormality caused by the short circuit between the cathode and the anode of the light emitting device, and the structure for preventing short circuit in the pixel circuit is more reliable and stable, and the method Simple and easy to use, and no need to add laser ablation equipment.
  • the embodiment further provides a driving method of a pixel circuit.
  • the driving method includes: acquiring an input end signal of the light emitting circuit 3 through the short circuit protection circuit 4, and causing the short circuit protection circuit 4 to be turned off or on according to the input signal of the obtained light emitting circuit 3, thereby cutting off or conducting the light.
  • the step of the input signal branch of the circuit 3 prevents the short-circuit between the anode and the cathode inside the light-emitting circuit 3 from affecting the light-emitting state of the light-emitting circuit 3.
  • the driving method automatically controls the closed loop of the light emitting device to be turned off by the short circuit protection circuit 4, thereby functioning as an automatic short circuit.
  • the driving method of the pixel circuit includes the following steps:
  • the working phase inputting the data signal to the control end of the driving circuit, and outputting the illuminating signal corresponding to the data signal to the illuminating circuit through the driving circuit, the illuminating signal is the input end signal of the illuminating circuit; wherein the working phase includes the short circuit detecting phase, and the short circuit In the detecting phase, the input end signal of the light emitting circuit is obtained by the short circuit protection circuit, and the input signal branch of the light emitting circuit is cut off or turned on according to the input end signal of the light emitting circuit.
  • the short-circuit protection circuit 4 can disconnect the driving circuit 2 from the light-emitting circuit 3 to prevent a short circuit between the anode and the cathode inside the light-emitting circuit 3 to the light-emitting circuit. The effect of the illuminating state of 3.
  • the short circuit protection circuit of the pixel circuit includes a signal control circuit and a short circuit protection transistor.
  • the driving method further includes: in the short-circuit detecting phase, the signal control circuit acquires an input signal of the light-emitting circuit, and outputs a short-circuit control signal, and the short-circuit protection transistor cuts off or turns on the input signal branch of the light-emitting circuit according to the short-circuit control signal output by the signal control circuit. road.
  • the signal control circuit of the pixel circuit includes a decision control circuit and a precharge path.
  • the driving method further includes: in a non-working phase, outputting a signal through the pre-charging circuit to turn on the short-circuit protection transistor; in the short-circuit detecting phase, obtaining a signal of the input end of the light-emitting circuit by determining the control circuit, and outputting the short-circuit control signal, and pre-charging
  • the circuit transmits a short circuit control signal to the gate of the short circuit protection transistor to cut or turn on the input signal branch of the light emitting circuit.
  • the corresponding driving method controls the closed loop of the driving of the light emitting device to be turned off by the short circuit protection circuit, thereby functioning as a short circuit protection.
  • This embodiment provides a display panel having better display performance and display quality.
  • the display panel includes a plurality of pixel circuits arranged in an array, and at least one of the plurality of pixel circuits is the pixel circuit according to any one of the first embodiments.
  • the display panel can be any product or component having an display function such as an electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the pixel circuit in the display panel can perform automatic short-circuit protection to avoid the problem of pixel abnormality caused by a short circuit between the cathode and the anode of the light-emitting device, so the display panel has better display quality.

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Abstract

一种像素电路及其驱动方法、显示面板。该像素电路包括驱动电路(2)、发光电路(3)以及短路保护电路(4)，短路保护电路(4)串联设置于驱动电路(2)与发光电路(3)之间，且被配置为获取发光电路(3)的输入端信号，并根据获取的发光电路(3)的输入端信号切断或导通发光电路(3)的输入信号支路。

Description

像素电路及其驱动方法、显示面板 技术领域
本发明实施例涉及一种像素电路及其驱动方法、显示面板。
背景技术
随着显示技术的发展，OLED(Organic Light-Emitting Diode，有机发光二极管)作为新型显示器件，得到了越来越广泛的应用。
在OLED器件微显示结构中，包括阴极、阳极以及位于阴极和阳极之间的功能结构膜层，由于功能结构膜层的各膜层较薄，容易导致阴极与阳极之间产生短路。在制作过程中，OLED器件的制作工艺复杂，当功能结构膜层存在异物，或挖孔、爬坡等工艺没有控制好时，会造成功能结构膜层较薄，导致OLED器件的阴极与阳极之间电阻较小，从而阳极与阴极之间产生短路。如果一个像素电路中OLED器件的阴极与阳极之间产生短路，不仅该坏点像素不会发光，在坏点像素处出现黑点；同时，在坏点像素处会产生一个较大的电流，该大电流还会影响坏点像素周边的像素的发光状态。因此，OLED器件的阴极与阳极之间产生短路会严重影响显示质量。
为保证显示质量，需要将该坏点像素去掉，以抑制由于OLED器件的阴极与阳极之间产生短路而形成的大电流。目前，在像素电路中，OLED器件的阴极与阳极之间产生短路的处理方法为：先通过查询方式将坏点像素找到，然后采用激光烧蚀将坏点像素破坏掉。该处理方法不仅过程复杂，而且若产生新的坏点像素则难以补救。
发明内容
本公开至少一实施例提供一种像素电路及其驱动方法、显示面板，其能至少实现自动检测发光器件的输入端信号，并解决因发光器件的阴极与阳极之间产生短路而导致的像素异常的问题。
本公开至少一实施例提供一种像素电路，其包括驱动电路、发光电路以及短路保护电路，所述短路保护电路串联设置于所述驱动电路与所述发光电路之间，且被配置为获取所述发光电路的输入端信号，并根据得到的所述发光电路的输入端信号切断或导通所述发光电路的输入信号支路。
例如，在本公开一示例提供的像素电路中，所述短路保护电路包括短路保护晶体管和信号控制电路。所述信号控制电路，其输入端与所述发光电路的输入端连接，其输出端与所述短路保护晶体管的控制极连接，且被配置为获取所述发光电路的输入端信号，并输出短路控制信号；所述短路保护晶体管，其第一极与所述驱动电路的输出端连接，第二极与所述发光电路的输入端连接，且被配置为根据所述信号控制电路输出的所述短路控制信号，切断或导通所述发光电路的输入信号支路。
例如，在本公开一示例提供的像素电路中，所述信号控制电路包括判断控制电路，其输入端与所述发光电路的输入端连接，其输出端与所述短路保护晶体管的控制极连接，且被配置为在所述发光电路处于工作阶段时，获取所述发光电路的输入端信号，并输出所述短路控制信号。
例如，在本公开一示例提供的像素电路中，所述信号控制电路还包括预充电路。所述预充电路串联在判断控制电路和短路保护晶体管的控制极之间，且被配置为在发光电路处于非工作阶段时，控制所述短路保护晶体管处于开启状态，还被配置为在发光电路处于工作阶段时，将所述短路控制信号传输至所述短路保护晶体管的控制极。
例如，在本公开一示例提供的像素电路中，所述判断控制电路包括第一判断晶体管和第二判断晶体管。所述第一判断晶体管的控制极与所述发光电路的输入端连接，第一极与第一电平信号连接，第二极与所述第二判断晶体管的第二极连接；所述第二判断晶体管的控制极还与所述发光电路的输入端连接，第一极与第二电平信号连接，第二极与所述短路保护晶体管的控制极连接；所述第一判断晶体管和所述第二判断晶体管的类型相反。
例如，在本公开一示例提供的像素电路中，所述预充电路包括第一预充电晶体管、第二预充电晶体管、第三预充电晶体管和预充电电容。所述第一预充电晶体管的控制极与第一控制信号端连接，第一极与第三电平信号连接，第二极与所述短路保护晶体管的控制极连接；所述第二预充电晶体管的控制极与第二控制信号端连接，第一极与第四电平信号连接，第二极与所述第三预充电晶体管的第二极连接；所述第三预充电晶体管的控制极与第三控制信号端连接，第一极与所述判断控制电路的输出端连接；所述预充电电容的第一端与所述短路保护晶体管的控制极连接，第二端与所述第三预充电晶体管的第二极连接。
例如，本公开一示例提供的像素电路还包括开关电路，被配置为在导通时， 将数据信号传输到所述驱动电路的控制端。
例如，在本公开一示例提供的像素电路中，所述发光电路为有机电致发光器件，其阳极与所述短路保护电路的输入端连接，阴极与接地端连接。
本公开至少一实施例还提供一种像素电路的驱动方法，包括如下操作：在工作阶段，输入数据信号至所述驱动电路的控制端，通过所述驱动电路向所述发光电路输出与所述数据信号对应的发光信号，所述发光信号为所述发光电路的输入端信号；其中，所述工作阶段包括短路检测阶段，在所述短路检测阶段，通过所述短路保护电路获取所述发光电路的输入端信号，并根据所述发光电路的输入端信号切断或导通所述发光电路的输入信号支路。
例如，在本公开一示例提供的像素电路的驱动方法中，在所述短路检测阶段，信号控制电路获取所述发光电路的输入端信号，并输出所述短路控制信号，短路保护晶体管根据所述信号控制电路输出的所述短路控制信号，切断或导通所述发光电路的输入信号支路。
例如，本公开一示例提供的像素电路的驱动方法还包括：在非工作阶段，通过预充电路输出信号以导通所述短路保护晶体管；在所述短路检测阶段，通过判断控制电路获取所述发光电路的输入端信号，并输出所述短路控制信号，通过所述预充电路将所述短路控制信号传输至所述短路保护晶体管的控制极，从而切断或导通所述发光电路的输入信号支路。
本公开至少一实施例还提供一种显示面板，包括上述任一项所述的像素电路。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例或相关技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，并非对本公开的限制。
图1为本公开一实施例提供的一种像素电路的结构示意图；
图2为本公开另一实施例提供的一种像素电路的结构示意图；
图3为本公开又一实施例提供的一种像素电路的结构示意图；
图4为本公开再一实施例提供的一种像素电路的结构示意图；
图5为本公开图4所示的像素电路的时序图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例的附图，对本发明实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于所描述的本发明的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例一
本实施例提供一种像素电路，该像素电路可进行自动短路保护，一旦出现发光器件的阴极与阳极之间产生短路的情况，则将控制驱动发光器件发光的闭合回路断开，起到短路保护作用，避免发光器件因阴极与阳极之间产生短路而导致的像素异常的问题。而且该像素电路的结构简单稳定，像素电路的驱动方法简单易行。
例如，如图1所示，该像素电路可以包括驱动电路2、发光电路3以及短路保护电路4。短路保护电路4串联设置于驱动电路2与发光电路3之间，且被配置为获取发光电路3的输入端信号，并根据获取的发光电路3的输入端信号使得短路保护电路4自身断开或导通，从而切断或导通发光电路3的输入信号支路，以防止发光电路3内部的阳极与阴极之间产生短路而对发光电路3的发光状态造成的影响。
例如，驱动电路2被配置为驱动发光电路3发光，其可以向发光电路3传输与数据信号相对应的发光信号，从而驱动发光电路3发光。该发光信号例如可以为电流信号。
例如，如图1所示，该像素电路还包括开关电路1，该开关电路1被配置为在导通时，将数据信号传输至驱动电路2的控制端以控制流过驱动电路2的电流的大小。
例如，如图2所示，在本实施例提供的像素电路中，短路保护电路4可以包括短路保护晶体管Q3和信号控制电路41。信号控制电路41，其输入端与发光电路3的输入端连接，其输出端与短路保护晶体管Q3的控制极连接，且被配置为获取发光电路3的输入端信号，并输出短路控制信号至短路保护晶体管Q3的控制极；短路保护晶体管Q3，其第一极与驱动电路2的输出端连接，第二极与发光电路3的输入端连接，且被配置为根据信号控制电路41输出的短 路控制信号，切断或导通发光电路3的输入信号支路，从而起到短路保护作用。
进一步地，如图3所示，信号控制电路41包括判断控制电路411。判断控制电路411的输入端与发光电路3的输入端连接，输出端与短路保护晶体管Q3的控制极连接，且被配置为在发光电路3处于工作阶段时，获取发光电路3的输入端信号，并根据发光电路3的输入端信号，判断发光电路3处于工作阶段时其阳极和阴极之间是否发生短路现象，根据判断结果输出不同的短路控制信号。当判断发光电路3发生了短路现象，则输出第一短路控制信号以控制短路保护晶体管Q3断开，从而切断发光电路3的输入信号支路；当判断发光电路3未发生短路现象，则输出第二短路控制信号，以控制短路保护晶体管Q3导通，从而使得发光电路3的输入信号支路保持在导通状态。
例如，如图3所示，信号控制电路41还包括预充电路412。预充电路412串联在判断控制电路411和短路保护晶体管Q3之间，且被配置为在发光电路3处于非工作阶段时，将开启信号传输至短路保护晶体管Q3的控制极以导通短路保护晶体管Q3，还被配置为在发光电路3处于工作阶段时，将短路控制信号传输至短路保护晶体管Q3的控制极。
预充电路412通过在发光电路3处于非工作阶段时，控制短路保护晶体管Q3处于开启状态，从而保证发光电路3在初始工作阶段时，其输入信号支路处于导通状态，使得发光信号能传输至发光电路3以驱动其发光，防止判断控制电路411的误判。
例如，如图4所示，发光电路3可以包括有机电致发光器件(即OLED器件)。OLED器件的阳极与短路保护电路4连接，阴极与接地端VSS连接。发光电路3的输入信号端接收发光信号，并发出与该发光信号相对应的光。
例如，如图4所示，开关电路1包括第一晶体管Q1。例如，第一晶体管Q1也可以被称为开关晶体管Q1。第一晶体管Q1控制极与开关信号端(开关信号端即扫描信号输入端Gate)连接，第一极与数据信号端(数据信号端即数据信号输入端Data)连接，第二极与驱动电路2的输入端连接。当开关信号端将扫描信号施加到第一晶体管Q1的控制极，以导通第一晶体管Q1，则数据信号端传输的数据信号可经由第一晶体管Q1写入驱动电路2的控制端，从而控制驱动电路2(例如，第二晶体管Q2)导通或关闭。
例如，如图4所示，驱动电路2包括第二晶体管Q2和存储电容C1。例如，第二晶体管Q2也可以被称为驱动晶体管Q2。存储电容C1的第一端与第二晶 体管Q2的控制极连接，第二端与第二晶体管Q2的第一极连接；第二晶体管Q2的控制极与开关电路1的输出端连接，第一极与工作电压VDD连接，第二极与短路保护电路4的输入端连接。第二晶体管Q2的控制极例如可以作为驱动电路2的控制端，即，开关电路1传输的数据信号可以被写入第二晶体管Q2的控制极，存储电容C1被配置为存储数据信号并将其保持在第二晶体管Q2的控制，该数据信号可以控制第二晶体管Q2的导通程度，由此控制流过第二晶体管Q2的电流的大小。流过第二晶体管Q2的电流可以传输至发光电路3以驱动其发光，此流过第二晶体管Q2的电流可以决定像素发光的灰阶。
需要说明的是，根据需要该驱动电路2还可以包括传输晶体管、检测晶体管和复位晶体管等，本公开的实施例不限制驱动电路2的具体结构。
例如，如图4所示，判断控制电路411包括第一判断晶体管Q4和第二判断晶体管Q5。第一判断晶体管Q4的控制极与发光电路3的输入端连接，第一极与第一电平信号V1连接，第二极与第二判断晶体管Q5的第二极连接；第二判断晶体管Q5的控制极与发光电路3的输入端连接，第一极与第二电平信号V2连接，第二极用于与短路保护晶体管Q3的控制极连接。
例如，第一判断晶体管和第二判断晶体管的类型相反，即若第一判断晶体管为N型晶体管，则第二判断晶体管为P型晶体管；或者，若第一判断晶体管为P型晶体管，则第二判断晶体管为N型晶体管。
例如，如图4所示，预充电路412包括第一预充电晶体管Q6、第二预充电晶体管Q7、第三预充电晶体管Q8和预充电电容C2。第一预充电晶体管Q6的控制极与第一控制信号端S1连接，第一极与第三电平信号V3连接，第二极与短路保护晶体管Q3的控制极连接；第二预充电晶体管Q7的控制极与第二控制信号端S2连接，第一极与第四电平信号V4连接，第二极与第三预充电晶体管Q8的第二极连接；第三预充电晶体管Q8的控制极与第三控制信号端S3连接，第一极与判断控制电路411的输出端连接；预充电电容C2的第一端与短路保护晶体管Q3的控制极连接，第二端与第三预充电晶体管Q8的第二极连接。
这里应该理解的是，当晶体管为薄膜晶体管(Thin Film Transistor，简称TFT)时，晶体管的控制极对应为薄膜晶体管的栅极，第一极和第二极分别为薄膜晶体管的源极和漏极(或漏极和源极)。第一极和第二极根据需要是可以互换的，也就是说，第一极可以是源极也可以是漏极，对应地，第二极可以是 漏极也可以是源极。
在本实施例的像素电路中，第一晶体管Q1、第二晶体管Q2、第一判断晶体管Q4、第一预充电晶体管Q6、第二预充电晶体管Q7、第三预充电晶体管Q8为P型薄膜晶体管，第二判断晶体管Q5和短路保护晶体管Q3为N型薄膜晶体管。同样，应该理解的是，在具体应用中，像素电路中的薄膜晶体管Q1—Q8可混合选用N型薄膜晶体管和P型薄膜晶体管，只需相应调整选定类型的薄膜晶体管Q1—Q8的控制极的控制电压的电平即可。例如，对于N型薄膜晶体管，在控制极的控制电压为高电平时，该N型晶体管处于开启状态；对于P型晶体管时，在控制极的控制电压为低电平时，该P型晶体管会处于开启状态。同时应该理解的是，本实施例的像素电路中的晶体管Q1—Q8的类型并不限于薄膜晶体管，任何采用与像素电路中具有相同制程的具有电压控制能力的晶体管以使得本公开按照上述工作方式工作的像素电路均应包含在本公开的保护范围内，例如，晶体管Q1—Q8可以为场效应晶体管(Field Effect Transistor，简称FET)，更具体的可以为金属氧化物半导体场效应晶体管(Metal Oxide Semiconductor Field Effect Transistor，简称MOS FET)，本领域技术人员能够根据实际需要进行改变，此处不再附图赘述。
在本实施例的像素电路中，晶体管Q1、Q3、Q4、Q5、Q6、Q7、Q8均为开关型晶体管，晶体管Q2为驱动型晶体管。
需要说明的是，本实施例中的像素电路采用2T1C的电路来实现驱动发光电路3(例如，OLED器件)发光的基本功能，根据实际应用需求，该像素电路还可以具备电学补偿功能，以提升包含该像素电路的显示面板的显示均匀度。例如，补偿功能可以通过电压补偿、电流补偿或混合补偿来实现，具有补偿功能的像素电路例如可以实现为4T1C、4T2C、6T1C以及其它具有电学补偿功能的电路。
图5为图4所示的像素电路的时序图。
例如，可以将一帧分为A和B两个阶段，A阶段为发光电路3的非工作阶段，B为发光电路3的工作阶段。
当发光电路3处于非工作阶段A时，在开关信号端Gate的有效信号到来之前，第一控制信号端S1和第二控制信号端S2输出有效电平信号，从而使得第一预充电晶体管Q6和第二预充电晶体管Q7导通，第三控制信号端S3输出无效电平信号，从而使得第三预充电晶体管Q8截止，第三电平信号V3和第 四电平信号V4分别传输至预充电电容C2的两端，第三电平信号V3的电平值可以将短路保护晶体管Q3导通，预充电电容C2两端的电压差为V3-V4。
当发光电路3处于工作阶段B时，开关信号端Gate的有效信号到来，发光信号经过短路保护晶体管Q3传输至发光电路3，发光电路3进行工作，同时，第一控制信号端S1和第二控制信号端S2输出无效电平信号，从而使得第一预充电晶体管Q6和第二预充电晶体管Q7截止，第三控制信号端S3输出有效电平信号，从而使得第三预充电晶体管Q8导通。
例如，当发光电路3的OLED器件处于正常工作状态下时，OLED器件的阳极信号为高电平信号，第一判断晶体管Q4截止，第二判断晶体管Q5导通，第二电平信号V2传输至预充电电容C2的第二端，通过电容自举作用，预充电电容C2的第一端的电平信号值变为V3-V4+V2，该电平信号作为短路保护晶体管Q3的控制极的控制信号，可以保证短路保护晶体管Q3导通，使得当发光电路3在正常工作状态下时，短路保护晶体管Q3导通，从而发光电路3的输入信号支路导通。
例如，当发光电路3的OLED器件处于短路状态下时，OLED器件的阳极信号为低电平信号，第一判断晶体管Q4导通，第二判断晶体管Q5截止，第一电平信号V1传输至预充电电容C2的第二端，通过电容自举作用，预充电电容C2的第一端的电平信号值变为V3-V4+V1，该电平信号作为短路保护晶体管Q3的控制极的控制信号，可以使得短路保护晶体管Q3截止，从而使得当发光电路3在短路状态下，发光电路3的输入信号支路被切断。
在本实施例中，为保证短路保护晶体管Q3按预设条件导通和截至，第一电平信号V1、第二电平信号V2、第三电平信号V3、第4电平信号V4取值满足如下关系式：
V3-Vanode1>Vth3；
V3-V4+V2-Vanode2>Vth3；
V3-V4+V1-Vanode3<Vth3；
其中，Vth3为短路保护晶体管Q3的阈值电压，Vanode1为发光电路3处于非工作阶段时的输入端信号，即阳极信号，约为接近VSS的电压值，Vanode2为发光电路3在工作阶段时处于正常工作状态的输入端信号，即此时阳极信号为高电平信号，Vanode3为发光电路3在工作阶段时处于短路状态的输入端信号，即此时阳极信号为VSS。
第一控制信号端S1输出的有效电平信号满足使第一预充电晶体管Q6导通，第二控制信号端S2输出的有效电平信号满足使第二预充电晶体管Q7导通，第三控制信号端S3输出的有效电平信号满足使第三预充电晶体管Q8导通。
可见，在该像素电路中，加入短路保护电路4可以对OLED器件进行自动短路保护。在正常工作时，OLED器件的阳极电压为高电平，若OLED器件的阴极与阳极之间产生短路，其阳极电压变为为低电平。在像素电路中，OLED器件作为一个兆欧级电阻的电子元件串联在发光支路(VDD-VSS支路)中，如果阴极与阳极之间产生短路，OLED器件的电阻降低，甚至降低为0欧，则发生短路的OLED器件与未发生短路的OLED器件相比，其阳极电压会大幅降低。通过短路保护电路4中的开关晶体管对OLED器件的阳极电压进行监测，实时获取其阳极电压，一旦阳极电压变为低电平，则控制驱动OLED器件发光的闭合回路断开(例如，控制短路保护晶体管Q3断开)，从而起到自动短路保护作用。
该像素电路通过短路保护电路控制驱动发光器件发光的闭合回路断开，避免发光器件因阴极与阳极之间产生短路导致的像素异常的问题，且该像素电路中防止短路的结构更可靠稳定、方法简单易行，而且无需再增加激光烧蚀设备。
例如，本实施例还提供一种像素电路的驱动方法。
例如，该驱动方法包括：通过短路保护电路4获取发光电路3的输入端信号，并根据得到的发光电路3的输入端信号使得短路保护电路4自身断开或导通，从而切断或导通发光电路3的输入信号支路的步骤，以防止发光电路3内部的阳极与阴极之间产生短路而对发光电路3的发光状态造成的影响。该驱动方法通过短路保护电路4自动控制驱动发光器件发光的闭合回路断开，从而起到自动短路保护作用。
例如，该像素电路的驱动方法包括以下步骤：
在工作阶段：输入数据信号至驱动电路的控制端，通过驱动电路向发光电路输出与数据信号对应的发光信号，发光信号为发光电路的输入端信号；其中，工作阶段包括短路检测阶段，在短路检测阶段，通过短路保护电路获取发光电路的输入端信号，并根据发光电路的输入端信号切断或导通发光电路的输入信号支路。
若发光电路3中的OLED器件的阴极与阳极之间产生短路，在短路检测阶段，若向发光电路3的阳极输入的电压为高电平时，则在发生阴极与阳极短路 的情况下，发光电路3的阳极的电压下降为低电平，短路保护电路4可以使得驱动电路2与发光电路3断开，以防止发光电路3内部的阳极与阴极之间产生短路对发光电路3的发光状态造成的影响。
例如，该像素电路的短路保护电路包括信号控制电路和短路保护晶体管。驱动方法还包括：在短路检测阶段，信号控制电路获取发光电路的输入端信号，并输出短路控制信号，短路保护晶体管根据信号控制电路输出的短路控制信号，切断或导通发光电路的输入信号支路。
例如，该像素电路的信号控制电路包括判断控制电路和预充电路。该驱动方法还包括：在非工作阶段，通过预充电路输出信号以导通短路保护晶体管；在短路检测阶段，通过判断控制电路获取发光电路的输入端信号，并输出短路控制信号，通过预充电路将短路控制信号传输至短路保护晶体管的控制极，以切断或导通发光电路的输入信号支路。
由此可见，基于本实施例提供的像素电路，其相应的驱动方法通过短路保护电路控制驱动发光器件发光的闭合回路断开，从而起到短路保护作用。
实施例二
本实施例提供一种显示面板，该显示面板具有较佳的显示性能和显示品质。
例如，该显示面板包括多个呈阵列排列的像素电路，该多个像素电路中的至少一个像素电路为实施例一中任一所述的像素电路。该显示面板可以为电子纸、OLED面板、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
该显示面板中的像素电路可以进行自动短路保护，避免发光器件因阴极与阳极之间产生短路而导致的像素异常的问题，因此该显示面板具有更好的显示品质。
可以理解的是，以上实施方式仅仅是为了说明本公开的原理而采用的示例性实施方式，然而本公开并不局限于此。对于本领域内的普通技术人员而言，在不脱离本公开的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本公开的保护范围。
本专利申请要求于2016年12月29日递交的中国专利申请第201611251335.6号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (12)

  1. 一种像素电路，包括：驱动电路、发光电路和短路保护电路，其中，所述短路保护电路串联设置于所述驱动电路与所述发光电路之间，被配置为获取所述发光电路的输入端信号，并根据所述发光电路的输入端信号切断或导通所述发光电路的输入信号支路。
  2. 根据权利要求1所述的像素电路，其中，所述短路保护电路包括：短路保护晶体管和信号控制电路，
    所述信号控制电路，其输入端与所述发光电路的输入端连接，其输出端与所述短路保护晶体管的控制极连接，且被配置为获取所述发光电路的输入端信号，并输出短路控制信号；
    所述短路保护晶体管，其第一极与所述驱动电路的输出端连接，第二极与所述发光电路的输入端连接，且被配置为根据所述信号控制电路输出的所述短路控制信号，切断或导通所述发光电路的输入信号支路。
  3. 根据权利要求2所述的像素电路，其中，所述信号控制电路包括：判断控制电路，其输入端与所述发光电路的输入端连接，其输出端与所述短路保护晶体管的控制极连接，且被配置为在所述发光电路处于工作阶段时，获取所述发光电路的输入端信号，并输出所述短路控制信号。
  4. 根据权利要求2或3所述的像素电路，其中，所述信号控制电路还包括：预充电路，所述预充电路串联在所述判断控制电路和所述短路保护晶体管的控制极之间，且被配置为在所述发光电路处于非工作阶段时，控制所述短路保护晶体管处于开启状态，还被配置为在所述发光电路处于工作阶段时，将所述短路控制信号传输至所述短路保护晶体管的控制极。
  5. 根据权利要求3或4所述的像素电路，其中，所述判断控制电路包括：第一判断晶体管和第二判断晶体管，
    所述第一判断晶体管的控制极与所述发光电路的输入端连接，第一极与第一电平信号连接，第二极与所述第二判断晶体管的第二极连接；
    所述第二判断晶体管的控制极与所述发光电路的输入端连接，第一极与第二电平信号连接，第二极与所述短路保护晶体管的控制极连接；
    所述第一判断晶体管和所述第二判断晶体管的类型相反。
  6. 根据权利要求4所述的像素电路，其中，所述预充电路包括：第一预 充电晶体管、第二预充电晶体管、第二预充电晶体管和预充电电容，
    所述第一预充电晶体管的控制极与第一控制信号端连接，第一极与第三电平信号连接，第二极与所述短路保护晶体管的控制极连接；
    所述第二预充电晶体管的控制极与第二控制信号端连接，第一极与第四电平信号连接，第二极与所述第三预充电晶体管的第二极连接；
    所述第三预充电晶体管的控制极与第三控制信号端连接，第一极与所述判断控制电路的输出端连接；
    所述预充电电容的第一端与所述短路保护晶体管的控制极连接，第二端与所述第三预充电晶体管的第二极连接。
  7. 根据权利要求1-6任一项所述的像素电路，还包括开关电路，被配置为在导通时，将数据信号传输到所述驱动电路的控制端。
  8. 根据权利要求1-7任一项所述的像素电路，其中，所述发光电路为有机电致发光器件，其阳极与所述短路保护电路的输入端连接，阴极与接地端连接。
  9. 一种用于权利要求1-8任一项所述像素电路的驱动方法，包括：
    在工作阶段，输入数据信号至所述驱动电路的控制端，通过所述驱动电路向所述发光电路输出与所述数据信号对应的发光信号，所述发光信号为所述发光电路的输入端信号；
    其中，所述工作阶段包括短路检测阶段，在所述短路检测阶段，通过所述短路保护电路获取所述发光电路的输入端信号，并根据所述发光电路的输入端信号切断或导通所述发光电路的输入信号支路。
  10. 根据权利要求9所述的像素电路的驱动方法，其中，
    在所述短路检测阶段，信号控制电路获取所述发光电路的输入端信号，并输出短路控制信号，短路保护晶体管根据所述信号控制电路输出的所述短路控制信号，切断或导通所述发光电路的输入信号支路。
  11. 根据权利要求9或10所述的像素电路的驱动方法，还包括：
    在非工作阶段，通过预充电路输出信号以导通所述短路保护晶体管；
    在所述短路检测阶段，通过判断控制电路获取所述发光电路的输入端信号，并输出所述短路控制信号，通过所述预充电路将所述短路控制信号传输至所述短路保护晶体管的控制极，从而切断或导通所述发光电路的输入信号支路。
  12. 一种显示面板，包括权利要求1-8任一项所述的像素电路。
PCT/CN2017/088267 2016-12-29 2017-06-14 像素电路及其驱动方法、显示面板 WO2018120667A1 (zh)

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