WO2015014147A1 - 像素电路、有机电致发光显示面板及显示装置 - Google Patents

像素电路、有机电致发光显示面板及显示装置 Download PDF

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Publication number
WO2015014147A1
WO2015014147A1 PCT/CN2014/077616 CN2014077616W WO2015014147A1 WO 2015014147 A1 WO2015014147 A1 WO 2015014147A1 CN 2014077616 W CN2014077616 W CN 2014077616W WO 2015014147 A1 WO2015014147 A1 WO 2015014147A1
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Prior art keywords
module
sub
terminal
switching transistor
voltage
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Ceased
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PCT/CN2014/077616
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English (en)
French (fr)
Inventor
周全国
祁小敬
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Priority to US14/418,620 priority Critical patent/US9495908B2/en
Publication of WO2015014147A1 publication Critical patent/WO2015014147A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
    • 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]
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • 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
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • 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
    • G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
    • 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
    • G09G2354/00—Aspects of interface with display user
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
    • 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Definitions

  • Pixel circuit organic electroluminescence display panel and display device
  • Embodiments of the present invention relate to a pixel circuit, an organic electroluminescence display panel, and a display device. Background technique
  • OLED Organic Light Emitting Diode
  • the circuits generally used for implementing the display driving and the touch driving are separately designed, that is, one set of circuits is used to implement the touch function, and another set of circuits is used to implement the OLED.
  • the display driving function, and separately setting the display driving circuit and the touch circuit have the disadvantages of high manufacturing cost, heavy display, and relatively thick display. Summary of the invention
  • the embodiment of the invention provides a pixel circuit, comprising: a driving sub-module, a data writing sub-module, a touch detection sub-module having a photosensitive device, and an illumination control sub-module having a light-emitting device;
  • the first end of the driving sub-module is connected to the first end of the data writing sub-module and the first end of the touch detection sub-module, and the second end of the driving sub-module is respectively The second end of the data writing sub-module, the second end of the touch detection sub-module is connected to the first reference signal end, and the third end of the driving sub-module is respectively associated with the data writing sub-module
  • the third end of the touch detection submodule is connected to the first end of the illumination control submodule;
  • the fourth end of the data writing sub-module is connected to the reset signal end, the fifth end of the data writing sub-module is connected to the scanning signal end, and the sixth end of the data writing sub-module is connected to the data signal end.
  • the data writing submodule transmits a data signal to the first end of the driving submodule;
  • the fourth end of the touch detection sub-module is connected to the touch control signal end, and the fifth end of the touch detection sub-module is connected to the touch signal read end; the control at the touch control signal end
  • the touch detection sub-module controls the driving sub-module to output a touch detection signal to the touch signal reading end, and the touch detection signal is irradiated to the light intensity of the photosensitive device. Increase and decrease;
  • the second end of the illumination control sub-module is connected to the second reference signal end, and the third end of the illumination control sub-module is connected to the illumination control signal end; under the control of the illumination control signal end, the illumination control sub-controller
  • the module controls the driving sub-module to drive the light emitting device to emit light.
  • the pixel circuit provided by the embodiment of the present invention, under the control of the reset signal end, the scan signal end and the data signal end, the data writing submodule transmits a data signal to the first end of the driving submodule; Under the control of the signal end, the touch detection sub-module controls the driving sub-module to output a touch detection signal to the touch signal reading end, and the touch detection signal decreases as the light intensity of the photosensitive device is increased. Touch detection function; Under the control of the illumination control signal end, the illumination control sub-module controls the driving sub-module to drive the illumination device to emit light, thereby realizing the display driving function.
  • the pixel circuit integrates the touch and display functions, which can save the manufacturing cost of separately setting the display driving circuit and the touch circuit, and can also reduce the thickness of the display panel.
  • the first end and the second end of the driving submodule are signal input ends, and the third end of the driving submodule is a signal output end;
  • the first end of the data writing sub-module is a signal output end, and the second end, the third end, the fourth end, the fifth end and the sixth end of the data writing sub-module are signal input ends;
  • One of the first end and the second end of the touch detection sub-module is a signal input end, and the other of the first end and the second end of the touch detection sub-module is a signal output end;
  • the third end and the fourth end of the control detection sub-module are signal input ends, and the fifth end of the touch detection sub-module is a signal output end;
  • the first end and the second end of the illumination control sub-module One is a signal input end, and the other of the first end and the second end of the illumination control sub-module is a signal output end;
  • the third end of the illumination control sub-module is a signal input end.
  • the driving submodule includes: a driving transistor; wherein
  • a gate of the driving transistor is a first end of the driving submodule, a source of the driving transistor is a second end of the driving submodule, and a drain of the driving transistor is a third end of the driving submodule .
  • the driving transistor is an N-type transistor, a voltage of the first reference signal terminal is a negative voltage or a zero voltage, a voltage of the second reference signal terminal is a positive voltage; and the driving transistor is a P
  • the voltage of the first reference signal terminal is a positive voltage
  • the voltage of the second reference signal terminal is a negative voltage or a zero voltage.
  • the data writing submodule includes: a first switching transistor, a second switching transistor, a first capacitor, and a second capacitor; wherein
  • a gate of the first switching transistor is connected to the reset signal end, a source of the first switching transistor is connected to a third end of the driving submodule, and a drain of the first switching transistor is respectively The first end of the driving submodule, the first end of the first capacitor, and the first end of the second capacitor are connected;
  • a gate of the second switching transistor is connected to the scan signal end, a source of the second switching transistor is connected to the data signal end, a drain of the second switching transistor is opposite to the first capacitor The second end is connected;
  • the second end of the second capacitor is connected to the first reference signal end, the second end of the driving submodule, and the second end of the touch detection submodule.
  • the first switching transistor is an N-type transistor or a P-type transistor
  • the second switching transistor is an N-type transistor or a P-type transistor.
  • the touch detection sub-module includes: a third switching transistor and a fourth switching transistor; wherein
  • a gate of the third switching transistor is connected to the touch control signal end, and a drain of the third switching transistor is connected to a first end of the photosensitive device;
  • One of a source of the third switching transistor and a second end of the photosensor is coupled to a first end of the driving submodule, a source of the third switching transistor, and a second end of the photosensor The other is connected to the first reference signal end;
  • a gate of the fourth switching transistor is connected to the touch control signal end, a source of the fourth switching transistor is connected to a third end of the driving submodule, and a drain of the fourth switching transistor is The touch signal reading ends are connected.
  • the third switching transistor and the fourth switching transistor are N-type transistors; or, the third switching transistor and the fourth switching transistor are P-type transistors.
  • the illumination control sub-module includes: a fifth switching transistor; wherein a gate of the fifth switching transistor is connected to the light emission control signal end, and a drain of the fifth switching transistor is connected to a first end of the light emitting device;
  • One of a source of the fifth switching transistor and a second end of the light emitting device is connected to a third end of the driving submodule, a source of the fifth switching transistor and a second end of the light emitting device The other is connected to the second reference signal terminal.
  • the fifth switching transistor is an N-type transistor or a P-type transistor.
  • An organic electroluminescent display panel includes a pixel circuit provided by an embodiment of the invention.
  • a display device includes the organic electroluminescent display panel provided by the embodiment of the invention.
  • FIG. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention.
  • FIG. 2a is a schematic diagram of a specific structure of a pixel circuit according to an embodiment of the present invention
  • FIG. 2b is a second schematic structural diagram of a pixel circuit according to an embodiment of the present invention
  • FIG. 2c is a circuit sequence diagram of a pixel circuit according to an embodiment of the present invention.
  • 3a is a third schematic structural diagram of a pixel circuit according to an embodiment of the present invention.
  • 3b is a fourth schematic diagram of a specific structure of a pixel circuit according to an embodiment of the present invention.
  • 3c is a circuit timing diagram of a pixel circuit according to an embodiment of the present invention.
  • FIG. 4a is a fifth schematic diagram of a specific structure of a pixel circuit according to an embodiment of the present invention.
  • FIG. 4b is a sixth schematic diagram of a specific structure of a pixel circuit according to an embodiment of the present disclosure.
  • 4c is a circuit timing diagram of a pixel circuit according to an embodiment of the present invention.
  • FIG. 5 is a seventh schematic diagram of a specific structure of a pixel circuit according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram of a specific structure of a pixel circuit according to an embodiment of the present invention
  • FIG. 5 is a circuit timing diagram of a pixel circuit according to an embodiment of the present invention.
  • a pixel circuit according to an embodiment of the present invention includes: a driving sub-module 1, a data writing sub-module 2, a touch detection sub-module 3 having a photosensitive device, and an illumination control device having a light-emitting device Sub-module 4 (photosensitive device and light-emitting device are not shown in Fig. 1).
  • the first end 1a of the driving sub-module 1 is connected to the first end 2a of the data writing sub-module 2 and the first end 3a of the touch detection sub-module 3, respectively, and the second end lb of the driving sub-module 1 is respectively written with data.
  • the second end 2b of the input sub-module 2 and the second end 3b of the touch detection sub-module 3 are connected to the first reference signal end Ref1, and the third end lc of the driving sub-module 1 is respectively associated with the data writing sub-module 2.
  • the third end 2c and the third end 3c of the touch detection sub-module 3 are connected to the first end 4a of the illumination control sub-module 4.
  • the fourth end 2d of the data writing sub-module 2 is connected to the reset signal end Reset, the fifth end 2e of the data writing sub-module 2 is connected to the scanning signal end Scan, and the sixth end 2f of the data writing sub-module 2 and the data signal
  • the data connection is connected; the data writing sub-module 2 transmits a data signal to the first end 1a of the driving sub-module 1 under the control of the reset signal end Reset, the scanning signal terminal Scan and the data signal terminal Data.
  • the fourth end 3d of the touch detection sub-module 3 is connected to the touch control signal terminal Select, and the fifth end 3e of the touch detection sub-module 3 is connected to the touch signal read end Sensor; Under the control, the touch detection sub-module 3 controls the driving sub-module 1 to output a touch detection signal to the touch signal reading end sensor, and the touch detection signal is reduced as the light intensity of the photosensitive device is increased. small.
  • the second end 4b of the illumination control sub-module 4 is connected to the second reference signal terminal Ref2, and the third end 4c of the illumination control sub-module 4 is connected to the illumination control signal terminal EM; under the control of the illumination control signal terminal EM, the illumination control sub-controller
  • the module 4 controls the driving sub-module 1 to drive the light-emitting device to emit light.
  • the data writing sub-module 2 transmits a data signal to the first end 1a of the driving sub-module 1;
  • the touch detection sub-module 3 controls the driving sub-module 1 to output a touch detection signal to the touch signal reading end sensor, and the touch detection signal is irradiated to the photosensitive device light. Strongly increase and decrease, realize touch detection function;
  • the illumination control sub-module 4 controls the driving sub-module 1 to drive the illumination device to emit light, thereby realizing the display driving function.
  • the pixel circuit integrates the touch and display functions, which can save the manufacturing cost of separately setting the display driving circuit and the touch circuit, and can also reduce the thickness of the display panel.
  • the first end la and the second end lb of the driving submodule 1 are signal input ends, and the third end lc of the driving submodule 1 is a signal output end;
  • the first end 2a of the data writing sub-module 2 is a signal output end, and the second end 2b, the third end 2c, the fourth end 2d, the fifth end 2e and the sixth end 2f of the data writing sub-module 2 are signal inputs.
  • the first end 3a of the touch detection sub-module 3 is a signal input end, and the second end 3b is a signal output end.
  • the first end 3a of the touch detection sub-module 3 is a signal output end, and the second end 3b is a signal output end.
  • the third end 3c and the fourth end 3d of the touch detection sub-module 3 are signal input ends, and the fifth end 3e of the touch detection sub-module 3 is a signal output end;
  • the first end 4a of the illuminating control sub-module 4 is a signal input end
  • the second end 4b is a signal output end
  • the first end 4a of the illuminating control sub-module 4 is a signal output end
  • the second end 4b is a signal input end
  • the third end 4c of the illumination control sub-module 4 is a signal input.
  • the signal of the first reference signal end Ref1 is generally a DC signal, that is, the first reference signal end Ref1 is connected to the DC signal source;
  • the signal of the second reference signal end Ref2 is also generally The DC signal, that is, the second reference signal terminal Ref2 is connected to the DC signal source.
  • the driving control sub-module 1 in the above pixel circuit provided by the embodiment of the present invention may include a driving transistor ⁇ as shown in FIG.
  • the gate of the driving transistor TO is the first terminal la of the driving sub-module 1, and the source of the driving transistor TO drives the second terminal lb of the sub-module 1, and the drain of the driving transistor TO is the third terminal lc of the driving sub-module 1.
  • the driving sub-module 1 may also be other structures capable of implementing its driving control function, which is not limited herein.
  • the driving transistor TO may be an N-type transistor or a P-type transistor, which is not limited herein.
  • the threshold voltage ⁇ ⁇ is a positive value
  • the voltage of the first reference signal terminal Ref1 is a negative voltage or a zero voltage
  • the second reference signal terminal The voltage of Ref2 is a positive voltage
  • the driving transistor T0 is a P-type transistor
  • the threshold voltage ⁇ ⁇ is a negative value
  • the first reference signal The voltage of the terminal Refl is a positive voltage
  • the voltage of the second reference signal terminal Ref2 is a negative voltage or a zero voltage.
  • the operation of the above pixel circuit provided by the embodiment of the present invention is divided into two stages of touch and display.
  • the above-mentioned pixel circuit can perform the work of the touch phase first, and then perform the work of the display phase; or perform the work of the display phase first, and then perform the work of the touch phase, which is not limited herein.
  • the above pixel circuit is divided into three phases:
  • the first stage the initialization phase, in which the pixel circuit implements the initialization of the data write sub-module 2.
  • the touch detection sub-module 3 and the illumination control sub-module 4 are in a closed state, and the data writing sub-module 2 is reset under the control of the reset signal end Reset, the scan signal end Scan and the data signal end Data to make data
  • the first end 2a of the write sub-module 2 inputs an initial voltage value to the gate of the drive transistor TO.
  • the second stage the data writing phase, in which the pixel circuit implements data writing to the gate of the driving transistor TO.
  • the touch detection sub-module 3 and the illumination control sub-module 4 are in a closed state
  • the data writing sub-module 2 is in an on state under the control of the scanning signal terminal Scan
  • the data writing sub-module 2 is driven to the sub-module 1
  • the first end of the la transmits data signals.
  • the third stage the touch detection phase, in which the data writing sub-module 2 and the illumination control sub-module 4 are in the off state, the touch detection sub-module 3 is in the on state, and the touch detection sub-module 3 is turned on.
  • the control driving transistor TO outputs a touch detection signal to the touch signal reading end sensor, and the touch detection signal is reduced as the light intensity of the photosensitive device is increased, thereby realizing the detection of the touch.
  • the first stage the initialization phase, in which the pixel circuit implements the initialization of the data write sub-module 2.
  • the touch detection sub-module 3 and the illumination control sub-module 4 are in a closed state, and the data writing sub-module 2 is reset under the control of the reset signal end Reset, so that the data is written into the first end 2a of the sub-module 2
  • An initial voltage value is input to the gate of the drive transistor TO.
  • Second stage Data writing phase, in which the pixel circuit implements data writing to the gate of the drive transistor TO.
  • the touch detection sub-module 3 and the illumination control sub-module 4 are in a closed state
  • the data writing sub-module 2 is in an on state under the control of the scanning signal terminal Scan
  • the data writing sub-module 2 is driven to the sub-module 1
  • the first end of the la transmits data signals.
  • the third stage the illuminating driving stage, in which the data writing sub-module 2 and the touch detection sub-module 3 are in a closed state, the illuminating control sub-module 4 is in an on state, and the illuminating control sub-module 4 having the illuminating device
  • the drain of the driving transistor TO is connected, and the light-emitting control sub-module 4 controls the driving transistor TO to drive the light-emitting device to emit light, thereby realizing the display function.
  • the data writing sub-module 2 may include The first switching transistor T1, the second switching transistor ⁇ 2, the first capacitor Cstl, and the second capacitor Cst2.
  • the gate of the first switching transistor T1 is connected to the reset signal terminal Reset, the first switching transistor
  • the source of T1 is connected to the third end lc of the driving sub-module 1, and the drain of the first switching transistor T1 is respectively connected to the first end la of the driving sub-module, the first end x1 of the first capacitor Cstl, and the second capacitor Cst2
  • the first end yl is connected;
  • the gate of the second switching transistor T2 is connected to the scanning signal terminal Scan, the source of the second switching transistor T2 is connected to the data signal terminal Data, and the drain of the second switching transistor T2 is connected to the second terminal ⁇ 2 of the first capacitor Cstl;
  • the second end y2 of the second capacitor Cst2 is respectively connected to the first reference signal end Refl, the second end lb of the driving submodule 1, and the second end 3b of the touch detecting submodule 3.
  • the first switching transistor T1 may be an N-type transistor, as shown in FIG. 2a, FIG. 2b, FIG. 5a and FIG. 5b; the first switching transistor T1 may also be a P-type transistor, as shown in FIG. 3a, FIG. 3b, FIG. 4a and As shown in FIG. 4b, it is not limited herein.
  • the first switching transistor T1 is an N-type transistor, when the signal of the reset signal terminal Reset is high level, the first switching transistor T1 is in an on state; when the first switching transistor T1 is a P-type transistor, at the reset signal end Reset When the signal is low, the first switching transistor T1 is in an on state.
  • the second switching transistor T2 can be an N-type transistor, as shown in FIG. 2a, FIG. 2b, FIG. 5a and FIG. 5b; the second switching transistor T2 can also be a P-type transistor, as shown in FIG. 3a, FIG. 3b, FIG. 4a and As shown in FIG. 4b, it is not limited herein.
  • the second switching transistor T2 is an N-type transistor, when the signal of the scanning signal terminal Scan is at a high level, the second switching transistor T2 is in an on state; when the second switching transistor T2 is a P-type transistor, at the scanning signal end Scan When the signal is low, the second switching transistor T2 is in an on state.
  • the signal of the data signal end Data in the data writing phase should be a high level signal.
  • the signal of the data signal terminal Data in the data writing phase should be a low level signal.
  • the touch detection sub-module 3 is as shown in FIG. 2a, FIG. 2b, FIG. 3a, FIG. 3b, FIG. 4a, FIG. 4b, FIG. 5a and FIG.
  • the method may include: a third switching transistor T3 and a fourth switching transistor T4.
  • the gate of the third switching transistor ⁇ 3 is connected to the touch control signal terminal Select, and the drain of the third switching transistor T3 is connected to the first end pi of the photosensitive device;
  • the source of the third switching transistor T3 is connected to the first end la of the driving sub-module 1, and the second end p2 of the photosensor is connected to the first reference signal end Ref1, as shown in FIG. 2a, FIG. 3a, FIG. 4a and FIG. 5a.
  • the source of the third switching transistor T3 is connected to the first reference signal end Refl, and the second end p2 of the photosensitive device is connected to the first end la of the driving sub-module 1, as shown in FIG. 2b, FIG. 3b, FIG. 4b and FIG. As shown in 5b;
  • the gate of the fourth switching transistor T4 is connected to the touch control signal terminal Select, the source of the fourth switching transistor T4 is connected to the third terminal lc of the driving sub-module 1, and the drain of the fourth switching transistor T4 is read with the touch signal.
  • the terminal is connected to the Sensor.
  • the photosensitive device may specifically be a photodiode PD (Photo) Diode), the device used is simple, easy to implement and low in cost.
  • PD Photodiode
  • the positions of the photodiode PD and the third transistor T3 are interchangeable.
  • the cathode of the photodiode PD is connected to the drain of the third switching transistor T3, and the anode of the photodiode PD and the first reference
  • the signal terminal Refl is connected, as shown in FIG. 2a and FIG. 3a; or, the photodiode PD and the third transistor T3 are interchanged, as shown in FIG. 2b and FIG. 3b, the anode of the photodiode PD and the drain of the third switching transistor T3.
  • the poles of the photodiode PD are connected to the gate of the driving transistor TO.
  • the driving transistor TO is a P-type transistor
  • the anode of the photodiode PD is connected to the drain of the third switching transistor T3, and the cathode of the photodiode PD is connected to the first reference signal terminal Refl, as shown in FIG. 4a and FIG. 5a;
  • the photodiode PD and the third transistor T3 are interchanged, as shown in FIG. 4b and FIG. 5b, the photodiode
  • the cathode of the PD is connected to the drain of the third switching transistor T3, and the anode of the photodiode PD is connected to the gate of the driving transistor TO.
  • the photodiode PD is turned on when it is reverse biased and illuminated.
  • the working principle of the photodiode PD is as follows: When the photodiode PD in reverse bias is in the light, that is, when there is no touch, the photodiode PD generates photo-generated carriers under the action of the photoelectric effect, and a large reverse current is formed. The greater the intensity of the light that strikes the photodiode PD, the greater the reverse current generated by the photodiode PD.
  • the third switching transistor T3 and the fourth switching transistor T4 may be N-type transistors as shown in FIGS. 2a, 2b, 5a, and 5b; the third switching transistor T3 and the fourth switching transistor T4 may also be P-type The transistor, as shown in FIG. 3a, FIG. 3b, FIG. 4a and FIG. 4b, is not limited herein.
  • the third switching transistor T3 and the fourth switching transistor T4 are N-type transistors
  • the third switching transistor T3 and the fourth switching transistor T4 are in an on state
  • the third switching transistor T3 and the fourth switching transistor T4 are P-type transistors
  • the signal of the touch control signal terminal Select is low
  • the third switching transistor T3 and the fourth switching transistor T4 are in an on state.
  • the illumination control sub-module 4 as shown in FIG. 2a, FIG. 2b, FIG. 3a, FIG. 3b, FIG. 4a, FIG. 4b, FIG. 5a and FIG.
  • the method includes: a fifth switching transistor T5.
  • the gate of the fifth switching transistor ⁇ 5 is connected to the light-emitting control signal terminal ,, the drain of the fifth switching transistor ⁇ 5 is connected to the first terminal z1 of the light-emitting device; the source of the fifth switching transistor T5 and the third of the driving sub-module 1 End lc connected;
  • the second end z2 of the light emitting device is connected to the second reference signal end Ref2, as shown in FIG. 2a, FIG. 3a, FIG. 4a and FIG. 5a, or the source of the fifth switching transistor T5 is connected to the second reference signal end Ref2;
  • the second end z2 of the light emitting device is connected to the third end lc of the driving submodule 1, as shown in Figures 2b, 3b, 4b and 5b.
  • the light-emitting device in the pixel circuit provided by the embodiment of the present invention is generally an organic light-emitting diode (OLED), and the light-emitting device realizes light-emitting display under the action of the driving transistor TO on-state current.
  • OLED organic light-emitting diode
  • the positions of the OLED and the fifth switching transistor T5 can be interchanged.
  • the driving transistor TO is N-type.
  • the cathode of the OLED is connected to the drain of the fifth switching transistor T5, and the anode of the OLED is connected to the second reference signal terminal Ref2, as shown in FIG. 2a and FIG. 3a; or, the OLED and the fifth switching transistor T5 are interchanged.
  • the anode of the OLED is connected to the drain of the fifth switching transistor T5, and the cathode of the OLED is connected to the third end lc of the driving sub-module 1.
  • the driving transistor TO is a P-type transistor
  • the anode of the OLED is connected to the drain of the fifth switching transistor T5, and the cathode of the OLED is connected to the second reference signal terminal Ref2, as shown in FIG. 4a and FIG. 5a; or, OLED and The five-switch transistor T5 is interchanged.
  • the cathode of the OLED is connected to the drain of the fifth switching transistor T5, and the anode of the OLED is connected to the third terminal 1 of the driving sub-module 1.
  • the fifth switching transistor T5 can be an N-type transistor, as shown in FIG. 2a, FIG. 2b, FIG. 5a and FIG. 5b; the fifth switching transistor T5 can also be a P-type transistor, as shown in FIG. 3a, FIG. 3b, FIG. 4a and As shown in FIG. 4b, it is not limited herein.
  • the fifth switching transistor T5 is an N-type transistor, when the signal outputted by the light-emission control signal terminal EM is at a high level, the fifth switching transistor T5 is in an on state; when the fifth switching transistor T5 is a P-type transistor, in the light-emission control When the signal output from the signal terminal EM is low, the fifth switching transistor T5 is in an on state.
  • the driving transistor and the switching transistor may be a thin film transistor (TFT) or a metal oxide semiconductor field effect transistor (MOS, Metal). Oxide Semiconductor ), is not limited here. And the source and drain of these transistors can be interchanged without specific distinction. The principle is explained in detail.
  • the driving transistor TO is an N-type transistor
  • the voltage value Vss 0 of the first reference signal terminal Refi the voltage value V DD of the second reference signal terminal Ref2 is >0
  • the driving transistor TO is a P-type transistor
  • the driving transistor TO is an N-type transistor
  • the first transistor T1, the second switching transistor ⁇ 2, the third switching transistor ⁇ 3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are also ⁇ -type transistors.
  • . 2c is a circuit timing diagram of FIG. 2a and FIG.
  • the voltage of the scanning signal terminal Scan is V Sean
  • the voltage of the data signal end Data is V Data
  • the voltage of the reset signal end Reset is V Reset
  • the touch control signal end Select voltage is V Seleet
  • illumination control signal The voltage of the terminal EM is V EM
  • the voltage of the gate of the driving transistor TO is V A1 when there is a touch
  • the voltage of the gate of the driving transistor TO is VA2 when there is no touch.
  • the voltage V Reset of the reset signal terminal Reset is at a high level
  • the voltage V Select of the touch control signal terminal Select and the light control signal terminal EM
  • the voltage V EM is at a low level
  • the first switching transistor T1 is in an on state
  • the third switching transistor T3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the turned-on first switching transistor T1 changes the driving transistor TO into a diode.
  • the voltage V Scan of the scanning signal terminal Scan changes from a short high level to a low level, and the voltage V Data of the data signal terminal Data is synchronized with the voltage of the scanning signal terminal to change from a short high level to a low level.
  • the driving transistor TO of the diode connection mode is turned on.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Refl, and the voltage of the second terminal y2 of the second capacitor Cst2 is V ss .
  • the voltage V ss of the first reference signal terminal Ref1 starts to charge the second capacitor Cst2 via the driving transistor TO and the first switching transistor T1, and the voltage value V A of the first terminal yl charged to the second capacitor Cst2 is ⁇ ⁇ +
  • the driving transistor TO is turned off, wherein the threshold voltage of the driving transistor TO is ⁇ ⁇ , and at this time, the voltage difference on the second capacitor Cst2 is ⁇ ⁇ , and the driving at the first end yl of the second capacitor Cst2 is realized.
  • the storage of the threshold voltage of the transistor TO causes the data write sub-module 2 to be in an initialized state.
  • the photodiode PD is in an OFF state, regardless of whether or touch the photodiode PD, the gate voltage of the driving transistor ⁇ v A1 and v A2 are ⁇ ⁇ + ⁇ ⁇ .
  • the voltage V S of the scan signal terminal Scan (;an and the voltage V Data of the data signal terminal Data is at a high level, the reset signal terminal Reset Reset voltage V, the touch control signal Select terminal voltage V Selec; t and a light emission control signal EM terminal voltage V EM at a low level
  • the second switching transistor T2 is turned on, the first switching transistor Tl, the third The switching transistor ⁇ 3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Ref1, and the voltage of the second terminal y2 of the second capacitor Cst2 is V ss. source of the second switching transistor T2 by the data signal the data signal V data data output terminal by writing its drain electrode connected to a first capacitor and a second end Cstl x2, the second terminal of the first capacitor Cstl x2 The voltage of the voltage becomes V Data .
  • the coupling voltage of the first capacitor Cstl and the second capacitor Cst2 at the junction thereof, that is, the first terminal y 1 of the second capacitor Cst2 is V Data [Cl / ( C1 + C2 ) ] + V ss + Vth, where C1 and C2 are A capacitor Cstl And the capacitance value of the second capacitor Cst2.
  • the first terminal yl of the second capacitor C2 is connected to the gate of the driving transistor TO, and the voltage of the gate of the driving transistor TO is also V Data [Cl / ( C1 + C2 ) ] + ⁇ ⁇ ⁇ + ⁇ ⁇ , that is, in the driving transistor
  • the gate of TO implements data writing.
  • the photodiode PD is in an OFF state, regardless of whether or touch the photodiode PD, the gate voltage of the driving transistor TO ⁇ and V A2 are V Data [Cl / (C1 + C2)] + ⁇ ⁇ + ⁇ ⁇ .
  • the voltage of the touch control signal terminal Select V Selec; t is at a high level, and the voltage of the reset signal terminal Reset V Reset is scanned.
  • Scan signal terminal voltage V S (; an, the data signal data voltage terminal V data voltage V and the light emission control signal EM EM terminal at a low level, the third switching transistor T3 and the fourth switching transistor T4 is turned on, the first A switching transistor T1, a second switching transistor ⁇ 2, and a fifth switching transistor ⁇ 5 are in a closed state.
  • the photodiode PD has no light, there is a touch, the photodiode PD is in an off state, and the gate voltage V A of the driving transistor TO is maintained as V Data [Cl / ( C1 + C2 ) ] + ⁇ ⁇ ⁇ + ⁇ ⁇ ,
  • the driving transistor TO is turned on, the voltage V ss of the first reference signal terminal Ref1 is input to the source of the driving transistor TO, and the touch detection signal is output through the drain of the driving transistor TO, and the touch detection signal is turned on again.
  • the fourth switching transistor T4 is output to the touch signal reading terminal Sensor.
  • the photodiode PD At this time, if the photodiode PD is under illumination, that is, no touch, the photodiode PD generates photo-generated carriers under the action of the photoelectric effect, and the reverse current formed reduces the charge on the first capacitor Cstl and the second capacitor Cst2, resulting in The gate voltage input to the driving transistor TO decreases, and the touch detection signal outputted by the driving transistor TO and outputted to the touch signal reading terminal Sensor by the fourth switching transistor T4 becomes small.
  • the size of the touch detection signal is related to the intensity of the light that is incident on the photodiode PD. The greater the light intensity, the smaller the touch detection signal.
  • the first phase 1 of the display phase is displayed.
  • the voltage V Reset of the reset signal terminal Reset is at a high level
  • the voltage V Select of the touch control signal terminal Select and the voltage V of the light emission control signal terminal EM.
  • EM is at a low level
  • the first switching transistor T1 is in an on state
  • the third switching transistor T3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the turned-on first switching transistor T1 changes the driving transistor TO into a diode.
  • the voltage V ss of the first reference signal terminal Ref1 starts to charge the second capacitor Cst2 via the driving transistor TO and the first switching transistor T1, and the voltage value V A of the first terminal yl charged to the second capacitor Cst2 is ⁇ ⁇ +
  • the driving transistor TO is turned off, wherein the threshold voltage of the driving transistor TO is ⁇ ⁇ , and at this time, the voltage difference on the second capacitor Cst2 is ⁇ ⁇ , and the driving at the first end yl of the second capacitor Cst2 is realized.
  • the storage of the threshold voltage of the transistor TO causes the data write sub-module 2 to be in an initialized state.
  • the second phase 2 of the display phase is displayed.
  • the voltage V S of the scanning signal terminal Scan (;an and the voltage V Data of the data signal terminal Data is at a high level
  • the reset signal terminal is reset.
  • the voltage V Reset , the voltage V Selec;t of the touch control signal terminal Select, and the voltage V EM of the light-emitting control signal terminal EM are at a low level
  • the second switching transistor T2 is in an on state
  • the first switching transistor T1
  • the third switching transistor ⁇ 4 and the fifth switching transistor ⁇ 5 are in a closed state.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Ref1, and the voltage of the second terminal y2 of the second capacitor Cst2 is changed to V. ss. x2 second terminal T2 is written to source its drain terminal of the second capacitor Cstl x2 first switching transistor connected to a second data signal from the data signal V data data output terminal through the first capacitor of Cstl The voltage becomes V Data .
  • the coupling voltage of the first capacitor Cstl and the second capacitor Cst2 at the junction thereof, that is, the first terminal y 1 of the second capacitor Cst2 is V Data [Cl / ( C1 + C2 ) ] + V ss + Vth, where C1 and C2 Cstl first capacitor and the capacitance of the second capacitor Cst2.
  • the first end is connected to the gate of the driving transistor TO yl second capacitor C2, the driving voltage of the gate of the transistor TO is also v Data [ci / (ci + C2 )]+ ⁇ ⁇ + ⁇ ⁇ , that is, data writing is realized at the gate of the driving transistor TO.
  • the voltage V EM of the illumination control signal terminal EM is at a high level
  • the voltage V Reset of the reset signal terminal Reset is at a low level
  • the voltage V of the scan signal terminal Scan S (;an , the voltage V Data of the data signal terminal Data and the voltage V Selec; t of the touch control signal terminal Select are at a low level
  • the fourth switching transistor ⁇ 4 is in a closed state
  • the fifth switching transistor ⁇ 5 is in an on state
  • the OLED is turned on.
  • the gate voltage of the driving transistor TO remains V Data [Cl/( C1+C2 ) ]+ ⁇ ⁇ + ⁇ ⁇ ,
  • the touch sensing signal output by the touch signal reading end sensor is smaller than the touch output of the touch signal reading end sensor when there is no touch.
  • the sensing signal is large.
  • the pixel circuit in a display phase by the threshold voltage of the driving transistor TO ⁇ ⁇ stored on the second capacitor Cst2, to ensure that the voltage V DATA OLED driving voltage and light emission data signal related to the driving of the threshold voltage of the transistor TO ⁇ ⁇ has nothing to do, avoiding the influence of the threshold voltage ⁇ ⁇ on the OLED, that is, when the same data signal is loaded into different pixel units, an image with the same brightness can be obtained, and the uniformity of the brightness of the image in the display area of the display device is improved.
  • the driving transistor TO is an N-type transistor
  • the first transistor T1, the second switching transistor ⁇ 2, the third switching transistor ⁇ 3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are ⁇ -type transistors.
  • . 3c is a circuit timing diagram of FIG. 3a and FIG.
  • the voltage of the scanning signal terminal Scan is V Sean
  • the voltage of the data signal end Data is V Data
  • the voltage of the reset signal end Reset is V Reset
  • the touch control signal end The voltage of Select is V Selec;t
  • the voltage of the light-emitting control signal terminal EM is V EM
  • the voltage of the gate of the driving transistor TO is V A1 when there is a touch
  • the voltage of the gate of the driving transistor TO is VA2 when there is no touch.
  • the voltage V Reset of the reset signal terminal Reset is at a low level
  • the voltage V Select of the touch control signal terminal Select and the light control signal terminal EM
  • the voltage V EM is at a high level
  • the first switching transistor T1 is in an on state
  • the third switching transistor T3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the turned-on first switching transistor T1 changes the driving transistor ⁇ 0 into a diode connection.
  • the voltage V Scan of the scanning signal terminal Scan changes from a short low level to a high level, and the voltage V Data of the data signal terminal Data is synchronized with the voltage of the scanning signal terminal to change from a short high level to a low level.
  • the driving transistor TO of the diode connection mode is turned on.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Refl, and the voltage of the second terminal y2 of the second capacitor Cst2 is V ss .
  • the voltage V ss of the first reference signal terminal Ref1 starts to charge the second capacitor Cst2 via the driving transistor TO and the first switching transistor T1, and the voltage value V A of the first terminal yl charged to the second capacitor Cst2 is ⁇ ⁇ +
  • the driving transistor TO is turned off, wherein the threshold voltage of the driving transistor TO is ⁇ ⁇ , and at this time, the voltage difference on the second capacitor Cst2 is ⁇ ⁇ , and the driving at the first end yl of the second capacitor Cst2 is realized.
  • the storage of the threshold voltage of the transistor TO causes the data write sub-module 2 to be in an initialized state.
  • the photodiode PD is in an off state, and the gate voltages V A1 and V A2 of the driving transistor TO are both V ss +Vth regardless of whether or not the photodiode PD is touched.
  • the voltage of the scanning signal terminal Scan V S (; an is at a low level, the voltage of the data signal terminal Data V Data , the reset signal terminal Reset voltage V Reset , touch control signal terminal Select voltage V Selec; t and light emission control signal terminal EM voltage V EM are at a high level, second switching transistor T2 is in an on state, first switching transistor Tl, third The switching transistor ⁇ 3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Refl, and the voltage of the second terminal y2 of the second capacitor Cst2 is changed. to V ss. writes its drain electrode of the first capacitor second terminal x2 Cstl connected by a data signal the data signal V data data outputted through the source terminal of the second switching transistor T2, the second terminal of the first capacitor Cstl
  • the voltage of x2 becomes V Data
  • the coupling voltage of the first capacitor Cstl and the second capacitor Cst2 at the junction thereof, that is, the first terminal y 1 of the second capacitor Cst2 is V Data [Cl / ( C1 + C2 ) ] + V ss + Vth, where CI and C2 Capacitance of the first capacitor and the second capacitor Cst2 Cstl a.
  • the driving voltage of the gate of the transistor TO is also V Data [Cl / (C1 + C2 ) + ⁇ ⁇ + ⁇ ⁇ , that is, data writing is realized at the gate of the driving transistor TO.
  • the photodiode PD is in an off state, regardless of whether the photodiode PD has a touch or not, the gate voltage V of the driving transistor TO Both A1 and V A2 are V Data [Cl / ( C1 + C2 ) ] + ⁇ ⁇ + ⁇ ⁇ .
  • the voltage V Data of the data signal terminal Data and the voltage V Selec; t of the touch control signal terminal Select are at a low level, resetting The voltage of the signal terminal Reset V Reset , the voltage of the scanning signal terminal Scan V S (;an , and the illumination control signal
  • the voltage V EM of the terminal EM is at a high level, the third switching transistor T3 and the fourth switching transistor T4 are in an on state, and the first switching transistor T1, the second switching transistor ⁇ 2, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the photodiode PD has no light, there is a touch, the photodiode PD is in an off state, and the gate voltage of the driving transistor TO remains at V Data [Cl / ( C1 + C2 ) ] + V ss + Vth , so that tO driving transistor is turned on, a first reference signal voltage V ss terminal Refl drive transistor tO is input to the source, the drain of the driving transistor tO touch detection signal is output, but also by the touch detection signal to open The fourth switching transistor T4 is output to the touch signal reading terminal Sensor.
  • the photodiode PD At this time, if the photodiode PD is under illumination, that is, no touch, the photodiode PD generates photo-generated carriers under the action of the photoelectric effect, and the reverse current formed reduces the charge on the first capacitor Cstl and the second capacitor Cst2, resulting in The gate voltage VA2 input to the driving transistor TO drops, and the touch detection signal outputted by the driving transistor TO and outputted to the touch signal reading terminal Sensor by the fourth switching transistor T4 becomes small.
  • the size of the touch detection signal is related to the intensity of the light that is incident on the photodiode PD. The greater the light intensity, the smaller the touch detection signal.
  • Reset Reset voltage V is low, the touch control signal terminal voltage V Select Select terminal and the light emission control signal EM EM voltage V at a high level, the first switching transistor T1 is turned on, the third switching transistor T3, The fourth switching transistor ⁇ 4 and the fifth switching transistor ⁇ 5 are in a closed state.
  • the turned-on first switching transistor T1 changes the driving transistor TO into a diode.
  • the voltage V Scan of the scanning signal terminal Scan changes from a short low level to a high level, and the voltage V Data of the data signal terminal Data is synchronized with the voltage of the scanning signal terminal to change from a short high level to a low level.
  • the driving transistor TO of the diode connection mode is turned on.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Refl, and the voltage of the second terminal y2 of the second capacitor Cst2 is V ss .
  • the voltage V ss of the first reference signal terminal Ref1 starts to charge the second capacitor Cst2 via the driving transistor TO and the first switching transistor T1
  • the voltage value V A of the first terminal yl charged to the second capacitor Cst2 is ⁇ ⁇ +
  • the driving transistor TO is turned off, wherein the threshold voltage of the driving transistor TO is ⁇ ⁇ , and at this time, the voltage difference on the second capacitor Cst2 is ⁇ ⁇ , and the driving at the first end yl of the second capacitor Cst2 is realized.
  • the storage of the threshold voltage of the transistor TO causes the data write sub-module 2 to be in an initialized state.
  • the second phase 2 of the display phase In the data writing phase of the display phase, the second phase 2 of the display phase, at this time, the voltage of the scanning signal terminal Scan V S (; an is at a low level, the voltage of the data signal terminal Data V Data , the reset signal terminal Reset voltage V Reset , touch control signal terminal Select voltage V Selec; t and light emission control signal terminal EM voltage V EM are at a high level, second switching transistor T2 is in an on state, first switching transistor Tl, third The switching transistor ⁇ 3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • a second terminal of the second capacitor Cst2 y2 is connected directly to the first terminal the reference signal Refl, a second terminal voltage of the second capacitor Cst2 and y2 becomes V ss.
  • Its drain electrode voltage is written x2 second end connected to a first capacitor Cstl data signal from the data signal terminal V Data Data outputted by the source of the second switching transistor T2, the first end of the second capacitor Cstl becomes x2
  • the coupling voltage of the first capacitor Cstl and the second capacitor Cst2 at the junction thereof, that is, the first terminal y 1 of the second capacitor Cst2 is V Data [Cl / ( C1 + C2 ) ] + V ss +Vth, where CI and C2 are capacitance values of the first capacitor Cstl and the second capacitor Cst2, respectively.
  • the first terminal yl of the second capacitor C2 is connected to the gate of the driving transistor TO, and the voltage of the gate of the driving transistor TO is also V Data [Cl / ( C1 + C2 ) ] + ⁇ ⁇ ⁇ + ⁇ ⁇ , that is, in the driving transistor
  • the gate of TO implements data writing.
  • Phase 3 of the third stage show, at this time, the data signal Data voltage terminal V Data voltage V and the emission control signal EM EM terminal voltage V Reset is at low level, the reset signal terminal Reset
  • the voltage V S of the scan signal terminal Scan (S) and the voltage V Selec of the touch control signal terminal Selsct ; t are at a high level, the first switching transistor T1, the second switching transistor T2, the third switching transistor ⁇ 3, and The fourth switching transistor ⁇ 4 is in the off state, the fifth switching transistor ⁇ 5 is in the on state, and the OLED is turned on.
  • the gate voltage of the driving transistor TO remains v Data [ci/( C1+C2 ) ]+ ⁇ ⁇ + ⁇ ⁇ ,
  • the on-state current i d of the driving transistor TO satisfies the formula:
  • the on-state current i d is used to drive the light-emitting device to emit light, and the current flowing through the OLEDs is relatively uniform, and the current flowing through the OLEDs is not caused by the unevenness of the threshold voltage ⁇ ⁇ due to the manufacturing process of the back-plate. Causes uneven brightness.
  • the pixel circuit is in the touch phase, when the photodiode PD is in touch, the touch
  • the touch sensing signal output by the signal reading end sensor is larger than the touch sensing signal outputted by the touch signal reading end when no touch is applied.
  • the threshold voltage ⁇ ⁇ of the driving transistor TO is stored on the second capacitor Cst2 during the display phase, thereby ensuring that the driving voltage of the OLED emitting light is related to the voltage V DATA of the data signal, and the threshold value of the driving transistor TO
  • the voltage ⁇ ⁇ has nothing to do, avoiding the influence of the threshold voltage ⁇ ⁇ on the OLED, that is, when the same data signal is loaded into different pixel units, the image with the same brightness can be obtained, and the uniformity of the brightness of the image in the display area of the display device is improved.
  • the driving transistor TO is a P-type transistor
  • the first transistor T1, the second switching transistor ⁇ 2, the third switching transistor ⁇ 3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are also ⁇ -type transistors.
  • . 4c is a circuit timing diagram of FIG. 4a and FIG.
  • the voltage of the scanning signal end Scan is V Sean
  • the voltage of the data signal end Data is V Data
  • the voltage of the reset signal end Reset is V Reset
  • the touch control signal end The voltage of Select is V Selec;t
  • the voltage of the light-emitting control signal terminal EM is V EM
  • the voltage of the gate of the driving transistor TO is V A1 when there is a touch
  • the voltage of the gate of the driving transistor TO is VA when there is no touch.
  • the voltage V Reset of the reset signal terminal Reset is at a low level
  • the voltage V Select of the touch control signal terminal Select and the light control signal terminal EM
  • the voltage V EM is at a high level
  • the first switching transistor T1 is in an on state
  • the third switching transistor T3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the turned-on first switching transistor T1 changes the driving transistor TO into a diode.
  • the voltage V Scan of the scanning signal terminal Scan changes from a short low level to a high level, and the voltage V Data of the data signal end is synchronized with the voltage of the scanning signal terminal to change from a short low level to a high level.
  • the driving transistor TO of the diode connection mode is turned on.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Refl, and the voltage of the second terminal y2 of the second capacitor Cst2 is V DD .
  • the voltage V DD of the first reference signal terminal Ref1 starts to charge the second capacitor Cst2 via the driving transistor TO and the first switching transistor T1, and the voltage value V A of the first terminal yl charged to the second capacitor Cst2 is ⁇ ⁇ +
  • the driving transistor TO is turned off, wherein the threshold voltage of the driving transistor TO is ⁇ ⁇ , and at this time, the voltage difference on the second capacitor Cst2 is ⁇ ⁇ , and the first end yl of the second capacitor Cst2 is realized.
  • the storage of the threshold voltage of the drive transistor TO causes the data write sub-module 2 to be in an initialized state.
  • the photodiode PD is in an off state, and the gate voltages V A1 and V A2 of the driving transistor TO are both ⁇ ⁇ + ⁇ ⁇ regardless of whether or not the photodiode PD is touched.
  • the voltage V S of the scan signal terminal Scan (;an and the voltage V Data of the data signal terminal Data is at a low level, the reset signal terminal Reset voltage V Reset , touch control signal terminal Select voltage V Selec; t and light emission control signal terminal EM voltage V EM are at a high level, second switching transistor T2 is in an on state, first switching transistor T1, third The switching transistor ⁇ 3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Ref1, and the voltage of the second terminal y2 of the second capacitor Cst2 is V DD.
  • the coupling voltage of the first capacitor Cstl and the second capacitor Cst2 at the junction thereof, that is, the first terminal y 1 of the second capacitor Cst2 is V Data [Cl / ( C1 + C2 ) ] +V DD +Vth, where C1 and C2 are respectively The capacitance of a capacitor Cstl and a second capacitor Cst2.
  • the first terminal yl of the second capacitor C2 is connected to the gate of the driving transistor TO, and the voltage of the gate of the driving transistor ⁇ is also v Data [ci/ ( ci+C2 ) ]+ ⁇ ⁇ + ⁇ ⁇ , that is, data writing is realized at the gate of the driving transistor TO.
  • the photodiode PD is in an off state, regardless of whether the photodiode PD has a touch or not, the gate voltage of the driving transistor TO and V A2 is V Data [Cl/ ( C1+C2 ) ]+ ⁇ ⁇ + ⁇ ⁇ .
  • the voltage of the touch control signal terminal Select V Selec; t is at a low level, and the voltage of the reset signal terminal Reset V Reset , scan Scan signal terminal voltage V S (; an, the data signal data voltage terminal V data voltage V and the light emission control signal EM EM terminal at a high level, the third switching transistor T3 and the fourth switching transistor T4 is turned on, the first A switching transistor T1, a second switching transistor ⁇ 2, and a fifth switching transistor ⁇ 5 are in a closed state.
  • the photodiode PD has no light, there is a touch, the photodiode PD is in an off state, and the gate voltage V A of the driving transistor TO is maintained as V Data [Cl / ( C1 + C2 ) ] + ⁇ 00 + ⁇ ⁇ ,
  • the driving transistor TO is turned on, the voltage V DD of the first reference signal terminal Ref1 is input to the source of the driving transistor TO, and the touch detection signal is output through the drain of the driving transistor TO, and the touch detection signal is turned on again.
  • the fourth switching transistor T4 is output to the touch signal reading terminal Sensor.
  • the photodiode PD At this time, if the photodiode PD is under illumination, that is, there is no touch, the photodiode PD generates photo-generated carriers under the action of the photoelectric effect, and the reverse current formed increases the charge on the first capacitor Cstl and the second capacitor Cst2, resulting in The gate voltage VA2 input to the driving transistor TO rises, and the touch detection signal outputted by the driving transistor TO and outputted to the touch signal reading terminal Sensor by the fourth switching transistor T4 becomes small.
  • the size of the touch detection signal is related to the intensity of the light that is incident on the photodiode PD. The greater the light intensity, the smaller the touch detection signal.
  • the first phase 1 of the display phase is displayed.
  • the voltage V Reset of the reset signal terminal Reset is at a low level
  • the voltage V Select of the touch control signal terminal Select and the voltage V of the light emission control signal terminal EM.
  • EM is at a high level
  • the first switching transistor T1 is in an on state
  • the third switching transistor T3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the turned-on first switching transistor T1 changes the driving transistor TO into a diode.
  • the voltage V Scan of the scanning signal terminal Scan changes from a short low level to a high level, and the voltage V Data of the data signal end is synchronized with the voltage of the scanning signal terminal to change from a short low level to a high level.
  • the driving transistor TO of the diode connection mode is turned on.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Refl, and the voltage of the second terminal y2 of the second capacitor Cst2 is V DD .
  • the voltage V DD of the first reference signal terminal Ref1 starts to charge the second capacitor Cst2 via the driving transistor TO and the first switching transistor T1, and the voltage value V A of the first terminal yl charged to the second capacitor Cst2 is ⁇ ⁇ +
  • the driving transistor TO is turned off, wherein the threshold voltage of the driving transistor TO is ⁇ ⁇ , and at this time, the voltage difference on the second capacitor Cst2 is ⁇ ⁇ , and the driving at the first end yl of the second capacitor Cst2 is realized.
  • the storage of the threshold voltage of the transistor TO causes the data write sub-module 2 to be in an initialized state.
  • the second phase 2 of the display phase In the data writing phase of the display phase, the second phase 2 of the display phase, at this time, the voltage V S of the scanning signal terminal Scan (;an and the voltage V Data of the data signal terminal Data is at a low level, and the reset signal terminal is reset.
  • the voltage V Reset , the voltage V Selec;t of the touch control signal terminal Select, and the voltage V EM of the light emission control signal terminal EM are at a high level
  • the second switching transistor T2 is in an on state
  • the first switching transistor T1 the third switching transistor
  • the third switching transistor ⁇ 4 and the fifth switching transistor ⁇ 5 are in a closed state.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Ref1, and the voltage of the second terminal y2 of the second capacitor Cst2 is changed to V. DD.
  • the voltage becomes V Data , at which time the first capacitor Cstl and the second capacitor Cst2 are at their junction, ie at the first end y 1 of the second capacitor Cst2
  • the coupling voltage is V Data [Cl / ( C1 + C2 ) ] + V DD + Vth, where CI and C2 are capacitance values of the first capacitor Cstl and the second capacitor Cst2, respectively.
  • the first terminal yl of the second capacitor C2 is connected to the gate of the driving transistor TO, and the voltage of the gate of the driving transistor TO is also V Data [Cl / ( C1 + C2 )] + ⁇ ⁇ + ⁇ ⁇ , that is, in the driving transistor
  • the gate of TO implements data writing.
  • the voltage V EM of the illumination control signal terminal EM is at a low level
  • the voltage V Reset of the reset signal terminal Reset is at a high level
  • the voltage V of the scan signal terminal Scan S (;an , the voltage V Data of the data signal terminal Data and the voltage V Selec; t of the touch control signal terminal Select are at a high level
  • the fourth switching transistor ⁇ 4 is in the off state
  • the fifth switching transistor ⁇ 5 is in the on state
  • the OLED is turned on.
  • the gate voltage of the driving transistor TO remains as V Data [Cl/ ( C1+C2 ) ]+V DD +Vth,
  • the on-state current i d is used to drive the light-emitting device to emit light, and the current flowing through the OLEDs is relatively uniform, and the current flowing through the OLEDs is not caused by the unevenness of the threshold voltage ⁇ ⁇ due to the manufacturing process of the back-plate. Causes uneven brightness.
  • the touch sensing signal output by the touch signal reading end sensor is smaller than the touch output of the touch signal reading end sensor when there is no touch.
  • the sensing signal is large.
  • the pixel circuit in a display phase by the threshold voltage of the driving transistor TO ⁇ ⁇ stored on the second capacitor Cst2, to ensure that the voltage V DATA OLED driving voltage and light emission data signal related to the driving of the threshold voltage of the transistor TO ⁇ ⁇ has nothing to do, avoiding the influence of the threshold voltage ⁇ ⁇ on the OLED, that is, when the same data signal is loaded into different pixel units, an image with the same brightness can be obtained, and the uniformity of the brightness of the image in the display area of the display device is improved.
  • Example four As shown in FIGS. 5a and 5b, the driving transistor TO is a P-type transistor, and the first transistor T1, the second switching transistor ⁇ 2, the third switching transistor ⁇ 3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are ⁇ -type transistors.
  • 5c is a circuit timing diagram of FIG. 5a and FIG.
  • the voltage of the scanning signal terminal Scan is V Sean
  • the voltage of the data signal end Data is V Data
  • the voltage of the reset signal end Reset is V Reset
  • the touch control signal end The voltage of Select is V Seleet
  • the voltage of the light-emitting control signal terminal EM is V EM
  • the voltage of the gate of the driving transistor TO is V A1 when there is a touch
  • the voltage of the gate of the driving transistor TO is VA2 when there is no touch.
  • the voltage V Reset of the reset signal terminal Reset is at a high level
  • the voltage V Select of the touch control signal terminal Select and the light control signal terminal EM
  • the voltage V EM is at a low level
  • the first switching transistor T1 is in an on state
  • the third switching transistor T3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the turned-on first switching transistor T1 changes the driving transistor TO into a diode.
  • the voltage V Scan of the scanning signal terminal Scan changes from a short high level to a low level, and the voltage V Data of the data signal terminal Data is synchronized with the voltage of the scanning signal terminal to change from a short low level to a high level.
  • the driving transistor TO of the diode connection mode is turned on.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Ref1, and the voltage of the second terminal y2 of the second capacitor Cst2 becomes V DD .
  • the voltage V DD of the first reference signal terminal Ref1 starts to charge the second capacitor Cst2 via the driving transistor TO and the first switching transistor T1, and the voltage value V A of the first terminal yl charged to the second capacitor Cst2 is V DD +
  • the driving transistor TO is turned off, wherein the threshold voltage of the driving transistor TO is ⁇ ⁇ , and at this time, the voltage difference on the second capacitor Cst2 is ⁇ ⁇ , and the driving transistor is implemented at the first end yl of the second capacitor Cst2
  • the storage of the threshold voltage of TO causes the data write sub-module 2 to be in an initialized state.
  • the photodiode PD is in an off state, and the gate voltage V A ⁇ o V A2 of the driving transistor TO is ⁇ ⁇ + ⁇ ⁇ regardless of whether or not the photodiode PD is touched.
  • the scan signal Scan terminal voltage V S (; an at a high level, the data signal Data voltage V Data terminal, the reset signal terminal Reset voltage V Reset , touch control signal terminal Select voltage V Selec; t and light emission control signal terminal EM voltage V EM are at a low level
  • second switching transistor T2 is in an on state
  • first switching transistor Tl third
  • the switching transistor ⁇ 3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Ref1.
  • the voltage of the second terminal y2 of the second capacitor Cst2 becomes V DD .
  • the first terminal yl of the second capacitor C2 is connected to the gate of the driving transistor TO, and the voltage of the gate of the driving transistor TO is also V Data [Cl / ( C1 + C2 ) ] + ⁇ ⁇ + ⁇ ⁇ , that is , at the driving transistor
  • the gate of TO implements data writing.
  • the photodiode PD is in an off state, and the gate voltages V A1 and V A2 of the driving transistor TO are v Data [ci/ ( ci+C2 ) ]+ ⁇ ⁇ + ⁇ ⁇ regardless of whether the photodiode PD is touched or not. .
  • the voltage V Data of the data signal terminal Data and the voltage V Selec; t of the touch control signal terminal Select are at a high level, reset.
  • the voltage V Reset of the signal terminal Reset , the voltage V S of the scanning signal terminal Scan (;an , and the voltage V EM of the light-emission control signal terminal EM are at a low level, and the third switching transistor T3 and the fourth switching transistor T4 are turned on,
  • the first switching transistor T1, the second switching transistor ⁇ 2, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the photodiode PD has no light, there is a touch, the photodiode PD is in an off state, and the gate voltage of the driving transistor ⁇ remains v Data [ci/( ci+C2 ) ]+ ⁇ ⁇ + ⁇ ⁇ ,
  • the driving transistor TO is turned on, the voltage V DD of the first reference signal terminal Ref1 is input to the source of the driving transistor TO, and the touch detection signal is output through the drain of the driving transistor TO, and the touch detection signal is turned on again.
  • the fourth switching transistor T4 is output to the touch signal reading terminal Sensor.
  • the photodiode PD is under illumination, there is no touch, and the photodiode PD generates photo-generated carriers under the action of the photoelectric effect, and the reverse current is formed to make the first capacitor Cstl and the second capacitor.
  • the charge on Cst2 increases, causing the gate voltage VA2 input to the driving transistor TO to rise, thereby causing the touch detection signal outputted by the driving transistor TO and outputted to the touch signal reading terminal Sensor via the fourth switching transistor T4. Become smaller.
  • the size of the touch detection signal is related to the intensity of the light that is incident on the photodiode PD. The greater the light intensity, the smaller the touch detection signal.
  • Reset Reset is at high level voltage V, the touch control signal terminal voltage V Select Select voltage V and the emission control signal EM EM terminal at a low level, the first switching transistor T1 is turned on, The third switching transistor T3, the fourth switching transistor ⁇ 4, and the fifth switching transistor ⁇ 5 are in a closed state.
  • the turned-on first switching transistor T1 changes the driving transistor TO into a diode.
  • the voltage V Scan of the scanning signal terminal Scan changes from a short high level to a low level, and the voltage V Data of the data signal terminal Data is synchronized with the voltage of the scanning signal terminal to change from a short low level to a high level.
  • the driving transistor TO of the diode connection mode is turned on.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Refl, and the voltage of the second terminal y2 of the second capacitor Cst2 is V DD .
  • the voltage V DD of the first reference signal terminal Ref1 starts to charge the second capacitor Cst2 via the driving transistor TO and the first switching transistor T1
  • the voltage value V A of the first terminal yl charged to the second capacitor Cst2 is ⁇ ⁇ +
  • the driving transistor TO is turned off, wherein the threshold voltage of the driving transistor TO is ⁇ ⁇ , and at this time, the voltage difference on the second capacitor Cst2 is ⁇ ⁇ , and the driving at the first end yl of the second capacitor Cst2 is realized.
  • the storage of the threshold voltage of the transistor TO causes the data write sub-module 2 to be in an initialized state.
  • the second phase 2 of the display phase In the data writing phase of the display phase, the second phase 2 of the display phase, at this time, the voltage V S of the scanning signal terminal Scan (;an is at a high level, the voltage of the data signal terminal Data V Data , the reset signal end Reset The voltage V Reset , the voltage V Selec;t of the touch control signal terminal Select, and the voltage V EM of the light emission control signal terminal EM are at a low level, the second switching transistor T2 is in an on state, the first switching transistor T1, the third switching transistor ⁇ 3, the fourth switching transistor ⁇ 4 and the fifth switching transistor ⁇ 5 are in a closed state.
  • the second terminal y2 of the second capacitor Cst2 is directly connected to the first reference signal terminal Refl, and the voltage of the second terminal y2 of the second capacitor Cst2 becomes V DD.
  • the source of the second switching transistor T2 by the data signal V data data output terminal of the data signal written thereto through the drain electrode of the first capacitor second terminal Cstl x2 connected to the second terminal of the first capacitor x2 of Cstl The voltage becomes V Data .
  • the coupling voltage of the first capacitor Cstl and the second capacitor Cst2 at the junction thereof, that is, the first terminal y 1 of the second capacitor Cst2 is V Data [Cl / ( C1 + C2 ) ] + V DD + Vth, where C1 and C2 are Cstl a capacitor Cst2 and a second capacitance value of the capacitance.
  • the first end is connected to the gate of the driving transistor TO yl second capacitor C2, the driving voltage of the gate of the transistor TO is also V Data [Cl / (C1 + C2) ]+ ⁇ ⁇ + ⁇ ⁇ , that is, data writing is realized at the gate of the driving transistor TO.
  • phase stage 3 show the third stage, this time, the data signal Data voltage terminal V Data voltage V and the emission control signal EM EM terminal at a high level, the reset signal Reset terminal voltage V Reset , the voltage V Sean of the scanning signal terminal Scan, and the voltage V Selec; t of the touch control signal terminal Selsct are at a low level, the first switching transistor T1, the second switching transistor ⁇ 2, the third switching transistor ⁇ 3, and the fourth Switching transistor ⁇ 4 is in the off state, the fifth switch Transistor T5 is in an on state and the OLED is on.
  • the on-state current i d is used to drive the light-emitting device to emit light, and the current flowing through the OLEDs is relatively uniform, and the current flowing through the OLEDs is not caused by the unevenness of the threshold voltage ⁇ ⁇ due to the manufacturing process of the back-plate. Causes uneven brightness.
  • the touch sensing signal output by the touch signal reading end sensor is greater than the touch sensing output of the touch signal reading end when there is no touch.
  • the measurement signal is large.
  • the threshold voltage ⁇ ⁇ of the driving transistor TO is stored on the second capacitor Cst2 during the display phase, thereby ensuring that the driving voltage of the OLED emitting light is related to the voltage V DATA of the data signal, and the threshold value of the driving transistor TO
  • the voltage ⁇ ⁇ has nothing to do, avoiding the influence of the threshold voltage ⁇ ⁇ on the OLED, that is, when the same data signal is loaded into different pixel units, the image with the same brightness can be obtained, and the uniformity of the brightness of the image in the display area of the display device is improved.
  • an embodiment of the present invention further provides an organic electroluminescence display panel, including the above pixel circuit provided by the embodiment of the present invention, and the principle of solving the problem by the organic electroluminescence display panel and the foregoing pixel circuit
  • the implementation of the organic electroluminescent display panel can be referred to the implementation of the pixel circuit, and the repeated description is omitted.
  • an embodiment of the present invention further provides a display device, which includes the above-mentioned organic electroluminescent display panel provided by the embodiment of the present invention, and the display device may be a display, a mobile phone, a television, a notebook, an all-in-one, etc.
  • the display device may be a display, a mobile phone, a television, a notebook, an all-in-one, etc.
  • Other indispensable components of the display device are understood by those of ordinary skill in the art, and are not to be construed as limiting or limiting the invention.
  • a pixel circuit, an organic electroluminescence display panel and a display device are provided by embodiments of the present invention,
  • the pixel circuit comprises: a driving sub-module, a data writing sub-module, a touch detection sub-module having a photosensitive device, and an illumination control sub-module having a light-emitting device; wherein, at the reset signal end, the scan signal end, and the data signal end Under control, the data writing sub-module transmits a data signal to the first end of the driving sub-module; under the control of the touch control signal end, the touch detection sub-module controls the driving sub-module to output a touch detection to the touch signal reading end.
  • the measurement signal, the touch detection signal decreases as the light intensity of the photosensitive device increases, and the touch detection function is realized; under the control of the illumination control signal end, the illumination control sub-module controls the driving sub-module to drive the illumination device to emit light. , to achieve display driver function.
  • the pixel circuit integrates the touch and display functions, which can save the manufacturing cost of separately setting the display driving circuit and the touch circuit, and can also reduce the thickness of the display panel.

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Abstract

一种像素电路、有机电致发光显示面板及显示装置。该像素电路包括：驱动子模块（1），数据写入子模块（2），具有光敏器件的触控侦测子模块（3），和具有发光器件的发光控制子模块（4）。在复位信号端（Reset）、扫描信号端（Scan）和数据信号端（Data）的控制下，数据写入子模块（2）向驱动子模块（1）的第一端（1a）传输数据信号。在触控控制信号端（Select）的控制下，触控侦测子模块（3）控制驱动子模块（1）输出触控侦测信号，触控侦测信号随照射到光敏器件光强的增大而减小，以实现触控功能。在发光控制信号端（EM）的控制下，发光控制子模块（4）控制驱动子模块（1）驱动发光器件发光，以实现显示功能。该像素电路集成了触控与显示功能，可以节省分别设置显示驱动电路和触控电路的制作成本。

Description

像素电路、 有机电致发光显示面板及显示装置 技术领域
本发明的实施例涉及一种像素电路、有机电致发光显示面板及显示装置。 背景技术
随着显示器件正朝着轻薄化、 高解析化、 智能化、 节能化的发展， 触摸 屏（ Touch Screen Panel )的使用越来越广。 目前，内嵌式触摸屏 ( In Cell Touch Panel )由于将触控部件内嵌在显示屏内部， 可以减薄模组整体的厚度， 又可 以大大降低触摸屏的制作成本， 受到各大面板厂家的青睐。 而有机发光二极 管 （ Organic Light Emitting Diode, OLED )显示面板则因具有功耗低、 亮度 高、 成本低、 视角广， 以及响应速度快等优点， 而备受关注。
在现有的内嵌式触摸屏 OLED显示面板中， 一般用以实现其显示驱动和 触控驱动的电路是分别设计的， 即一套电路用以实现触控功能， 另一套电路 用以实现 OLED的显示驱动功能， 而分别设置显示驱动电路和触控电路， 会 存在制作成本较高， 显示屏较重， 且比较厚的缺点。 发明内容
本发明实施例提供了一种像素电路， 包括： 驱动子模块， 数据写入子模 块，具有光敏器件的触控侦测子模块，以及具有发光器件的发光控制子模块； 其中，
所述驱动子模块的第一端分别与所述数据写入子模块的第一端和所述触 控侦测子模块的第一端相连， 所述驱动子模块的第二端分别与所述数据写入 子模块的第二端、 所述触控侦测子模块的第二端和第一参考信号端相连， 所 述驱动子模块的第三端分别与所述数据写入子模块的第三端、 所述触控侦测 子模块的第三端和所述发光控制子模块的第一端相连；
所述数据写入子模块的第四端与复位信号端相连， 所述数据写入子模块 的第五端与扫描信号端相连， 所述数据写入子模块的第六端与数据信号端相 连； 在所述复位信号端、 所述扫描信号端和所述数据信号端的控制下， 所述 数据写入子模块向所述驱动子模块的第一端传输数据信号；
所述触控侦测子模块的第四端与触控控制信号端相连， 所述触控侦测子 模块的第五端与触控信号读取端相连； 在所述触控控制信号端的控制下， 所 述触控侦测子模块控制所述驱动子模块向所述触控信号读取端输出触控侦测 信号， 所述触控侦测信号随着照射到所述光敏器件光强的增大而减小；
所述发光控制子模块的第二端与第二参考信号端相连， 所述发光控制子 模块的第三端与发光控制信号端相连； 在所述发光控制信号端的控制下， 所 述发光控制子模块控制所述驱动子模块驱动所述发光器件发光。
本发明实施例提供的一种像素电路， 该像素电路在复位信号端、 扫描信 号端和数据信号端的控制下， 数据写入子模块向驱动子模块的第一端传输数 据信号； 在触控控制信号端的控制下， 触控侦测子模块控制驱动子模块向触 控信号读取端输出触控侦测信号， 触控侦测信号随着照射到光敏器件光强的 增大而减小， 实现触控侦测功能； 在发光控制信号端的控制下， 发光控制子 模块控制驱动子模块驱动发光器件发光， 实现显示驱动功能。 该像素电路集 成了触控与显示功能， 这样可以节省分别设置显示驱动电路和触控电路的制 作成本， 还可以减薄显示面板的厚度。
在一个示例中， 所述驱动子模块的第一端和第二端为信号输入端， 所述 驱动子模块的第三端为信号输出端；
所述数据写入子模块的第一端为信号输出端， 所述数据写入子模块的第 二端、 第三端、 第四端、 第五端和第六端为信号输入端；
所述触控侦测子模块的第一端和第二端之一为信号输入端， 所述触控侦 测子模块的第一端和第二端的另一者为信号输出端； 所述触控侦测子模块的 第三端和第四端为信号输入端，所述触控侦测子模块的第五端为信号输出端； 所述发光控制子模块的第一端和第二端之一为信号输入端， 所述发光控 制子模块的第一端和第二端的另一者为信号输出端； 所述发光控制子模块的 第三端为信号输入端。
在一个示例中， 所述驱动子模块包括： 驱动晶体管； 其中，
所述驱动晶体管的栅极为所述驱动子模块的第一端， 所述驱动晶体管的 源极为所述驱动子模块的第二端， 所述驱动晶体管的漏极为所述驱动子模块 的第三端。 在一个示例中， 在所述驱动晶体管为 N型晶体管时， 所述第一参考信号 端的电压为负电压或零电压， 所述第二参考信号端的电压为正电压； 在所述 驱动晶体管为 P型晶体管时， 所述第一参考信号端的电压为正电压， 所述第 二参考信号端的电压为负电压或零电压。
在一个示例中， 所述数据写入子模块包括： 第一开关晶体管、 第二开关 晶体管、 第一电容和第二电容； 其中，
所述第一开关晶体管的栅极与所述复位信号端相连， 所述第一开关晶体 管的源极与所述驱动子模块的第三端相连， 所述第一开关晶体管的漏极分别 与所述驱动子模块的第一端、 所述第一电容的第一端和所述第二电容的第一 端相连；
所述第二开关晶体管的栅极与所述扫描信号端相连， 所述第二开关晶体 管的源极与所述数据信号端相连， 所述第二开关晶体管的漏极与所述第一电 容的第二端相连；
所述第二电容的第二端分别与所述第一参考信号端、 所述驱动子模块的 第二端相连和所述触控侦测子模块的第二端相连。
在一个示例中， 所述第一开关晶体管为 N型晶体管或 P型晶体管； 所述 第二开关晶体管为 N型晶体管或 P型晶体管。
在一个示例中， 所述触控侦测子模块包括： 第三开关晶体管和第四开关 晶体管； 其中，
所述第三开关晶体管的栅极与所述触控控制信号端相连， 所述第三开关 晶体管的漏极与所述光敏器件的第一端相连；
所述第三开关晶体管的源极和所述光敏器件的第二端之一与所述驱动子 模块的第一端相连， 所述第三开关晶体管的源极和所述光敏器件的第二端的 另一者与所述第一参考信号端相连；
所述第四开关晶体管的栅极与所述触控控制信号端相连， 所述第四开关 晶体管的源极与所述驱动子模块的第三端相连， 所述第四开关晶体管的漏极 与所述触控信号读取端相连。
在一个示例中，所述第三开关晶体管和所述第四开关晶体管为 N型晶体 管； 或， 所述第三开关晶体管和所述第四开关晶体管为 P型晶体管。
在一个示例中， 所述发光控制子模块包括： 第五开关晶体管； 其中， 所述第五开关晶体管的栅极与所述发光控制信号端相连， 所述第五开关 晶体管的漏极与所述发光器件的第一端相连；
所述第五开关晶体管的源极和所述发光器件的第二端之一与所述驱动子 模块的第三端相连， 所述第五开关晶体管的源极和所述发光器件的第二端的 另一者与所述第二参考信号端相连。
在一个示例中， 所述第五开关晶体管为 N型晶体管或 P型晶体管。
本发明实施例提供的一种有机电致发光显示面板， 包括本发明实施例提 供的像素电路。
本发明实施例提供的一种显示装置， 包括本发明实施例提供的有机电致 发光显示面板。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例的附图作 简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例， 而非对本发明的限制。
图 1为本发明实施例提供的像素电路的结构示意图；
图 2a为本发明实施例提供的像素电路的具体结构示意图之一； 图 2b为本发明实施例提供的像素电路的具体结构示意图之二； 图 2c为本发明实施例提供的像素电路的电路时序图之一；
图 3a为本发明实施例提供的像素电路的具体结构示意图之三；
图 3b为本发明实施例提供的像素电路的具体结构示意图之四；
图 3c为本发明实施例提供的像素电路的电路时序图之二；
图 4a为本发明实施例提供的像素电路的具体结构示意图之五；
图 4b为本发明实施例提供的像素电路的具体结构示意图之六；
图 4c为本发明实施例提供的像素电路的电路时序图之三；
图 5a为本发明实施例提供的像素电路的具体结构示意图之七；
图 5b为本发明实施例提供的像素电路的具体结构示意图之八； 图 5c为本发明实施例提供的像素电路的电路时序图之四。 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。
本发明实施例提供的一种像素电路， 如图 1所示， 包括： 驱动子模块 1、 数据写入子模块 2、具有光敏器件的触控侦测子模块 3，以及具有发光器件的 发光控制子模块 4 (图 1中未示出光敏器件和发光器件） 。
驱动子模块 1的第一端 la分别与数据写入子模块 2的第一端 2a和触控 侦测子模块 3的第一端 3a相连， 驱动子模块 1的第二端 lb分别与数据写入 子模块 2的第二端 2b、触控侦测子模块 3的第二端 3b和第一参考信号端 Ref 1 相连， 驱动子模块 1的第三端 lc分别与数据写入子模块 2的第三端 2c、 触 控侦测子模块 3的第三端 3c和发光控制子模块 4的第一端 4a相连。
数据写入子模块 2的第四端 2d与复位信号端 Reset相连，数据写入子模 块 2的第五端 2e与扫描信号端 Scan相连，数据写入子模块 2的第六端 2f与 数据信号端 Data相连； 在复位信号端 Reset、扫描信号端 Scan和数据信号端 Data的控制下， 数据写入子模块 2向驱动子模块 1的第一端 la传输数据信 号。
触控侦测子模块 3的第四端 3d与触控控制信号端 Select相连，触控侦测 子模块 3的第五端 3e与触控信号读取端 Sensor相连；在触控控制信号端 Select 的控制下，触控侦测子模块 3控制驱动子模块 1向触控信号读取端 Sensor输 出触控侦测信号， 该触控侦测信号随着照射到光敏器件光强的增大而减小。
发光控制子模块 4的第二端 4b与第二参考信号端 Ref2相连， 发光控制 子模块 4的第三端 4c与发光控制信号端 EM相连；在发光控制信号端 EM的 控制下， 发光控制子模块 4控制驱动子模块 1驱动发光器件发光。
本发明实施例提供的上述像素电路， 在复位信号端 Reset、 扫描信号端 Scan和数据信号端 Data的控制下， 数据写入子模块 2向驱动子模块 1的第 一端 la传输数据信号； 在触控控制信号端 Select的控制下，触控侦测子模块 3控制驱动子模块 1向触控信号读取端 Sensor输出触控侦测信号， 该触控侦 测信号随着照射到光敏器件光强的增大而减小， 实现触控侦测功能； 在发光 控制信号端 EM的控制下， 发光控制子模块 4控制驱动子模块 1驱动发光器 件发光， 实现显示驱动功能。 该像素电路集成了触控与显示功能， 这样可以 节省分别设置显示驱动电路和触控电路的制作成本， 还可以减薄显示面板的 厚度。
例如， 本发明实施例提供的上述像素电路中， 驱动子模块 1的第一端 la 和第二端 lb为信号输入端， 驱动子模块 1的第三端 lc为信号输出端；
数据写入子模块 2的第一端 2a为信号输出端，数据写入子模块 2的第二 端 2b、 第三端 2c、 第四端 2d、 第五端 2e和第六端 2f为信号输入端；
触控侦测子模块 3的第一端 3a为信号输入端，第二端 3b为信号输出端， 或，触控侦测子模块 3的第一端 3a为信号输出端，第二端 3b为信号输入端； 触控侦测子模块 3的第三端 3c和第四端 3d为信号输入端， 触控侦测子模块 3的第五端 3e为信号输出端；
发光控制子模块 4的第一端 4a为信号输入端，第二端 4b为信号输出端， 或，发光控制子模块 4的第一端 4a为信号输出端，第二端 4b为信号输入端； 发光控制子模块 4的第三端 4c为信号输入端。
例如，本发明实施例提供的上述像素电路中，第一参考信号端 Refl的信 号一般为直流信号， 即第一参考信号端 Refl与直流信号源相连； 第二参考信 号端 Ref2的信号一般也为直流信号， 即第二参考信号端 Ref2与直流信号源 相连。
本发明实施例提供的上述像素电路中的驱动控制子模块 1，如图 1所示， 可以包括驱动晶体管 το。
驱动晶体管 TO的栅极为驱动子模块 1的第一端 la，驱动晶体管 TO的源 极为驱动子模块 1的第二端 lb， 驱动晶体管 TO的漏极为驱动子模块 1的第 三端 lc。当然，驱动子模块 1也可以是能够实现其驱动控制功能的其它结构， 在此不做限定。
需要说明的是， 在具体实施时， 驱动晶体管 TO可以为 N型晶体管， 也 可以为 P型晶体管， 在此不做限定。 为了保证驱动晶体管 TO能正常工作， 当驱动晶体管 TO为 N型晶体管时，其阔值电压 νΛ为正值，且第一参考信号 端 Refl的电压为负电压或零电压， 第二参考信号端 Ref2的电压为正电压； 当驱动晶体管 T0为 P型晶体管时， 其阔值电压 νΛ为负值， 且第一参考信号 端 Refl的电压为正电压， 第二参考信号端 Ref2的电压为负电压或零电压。 例如， 本发明实施例提供的上述像素电路的工作分为触控和显示两个阶 段。 上述像素电路在工作时可以先执行触控阶段的工作， 然后执行显示阶段 的工作； 也可以先执行显示阶段的工作， 然后执行触控阶段的工作， 在此不 做限定。
下面对本发明实施例提供的上述像素电路在触控阶段和显示阶段的工作 原理进行简要介绍。
在触控阶段， 上述像素电路的工作具体分为三个阶段：
第一阶段： 初始化阶段， 在此阶段中像素电路实现了数据写入子模块 2 的初始化。在此阶段中触控侦测子模块 3和发光控制子模块 4处于关闭状态， 数据写入子模块 2在复位信号端 Reset、 扫描信号端 Scan和数据信号端 Data 的控制下进行复位， 使数据写入子模块 2的第一端 2a向驱动晶体管 TO的栅 极输入初始电压值。
第二阶段： 数据写入阶段，在此阶段中像素电路实现了对驱动晶体管 TO 栅极的数据写入。 在此阶段， 触控侦测子模块 3和发光控制子模块 4处于关 闭状态，数据写入子模块 2在扫描信号端 Scan的控制下处于开启状态，数据 写入子模块 2向驱动子模块 1的第一端 la传输数据信号。
第三阶段： 触控侦测阶段， 在此阶段中数据写入子模块 2和发光控制子 模块 4处于关闭状态， 触控侦测子模块 3处于开启状态， 开启的触控侦测子 模块 3控制驱动晶体管 TO向触控信号读取端 Sensor输出触控侦测信号， 该 触控侦测信号随着照射到光敏器件的光强的增大而减小， 实现触控的侦测。
在显示阶段， 上述像素电路的工作具体也分为三个阶段：
第一阶段： 初始化阶段， 在此阶段中像素电路实现了数据写入子模块 2 的初始化。在此阶段中触控侦测子模块 3和发光控制子模块 4处于关闭状态， 数据写入子模块 2在复位信号端 Reset的控制下进行复位， 使数据写入子模 块 2的第一端 2a向驱动晶体管 TO的栅极输入初始电压值。
第二阶段： 数据写入阶段，在此阶段中像素电路实现了对驱动晶体管 TO 栅极的数据写入。 在此阶段， 触控侦测子模块 3和发光控制子模块 4处于关 闭状态，数据写入子模块 2在扫描信号端 Scan的控制下处于开启状态，数据 写入子模块 2向驱动子模块 1的第一端 la传输数据信号。 第三阶段： 发光驱动阶段， 在此阶段中数据写入子模块 2和触控侦测子 模块 3处于关闭状态， 发光控制子模块 4处于导通状态， 具有发光器件的发 光控制子模块 4与驱动晶体管 TO的漏极相连， 发光控制子模块 4控制驱动 晶体管 TO驱动发光器件发光， 实现了显示功能。
下面对本发明实施例提供的上述像素电路中的数据写入子模块 2、 触摸 侦测子模块 3和发光控制子模块 4的具体结构和工作原理进行详细说明。
例如， 在本发明实施例提供的上述像素电路中， 数据写入子模块 2， 如 图 2a、 图 2b、 图 3a、 图 3b、 图 4a、 图 4b、 图 5a和图 5b所示， 可以包括： 第一开关晶体管 Tl、 第二开关晶体管 Τ2、 第一电容 Cstl和第二电容 Cst2。
第一开关晶体管 T1 的栅极与复位信号端 Reset相连， 第一开关晶体管
T1的源极与驱动子模块 1的第三端 lc相连，第一开关晶体管 T1的漏极分别 与驱动子模块的第一端 la、第一电容 Cstl的第一端 xl和第二电容 Cst2的第 一端 yl相连；
第二开关晶体管 T2的栅极与扫描信号端 Scan相连，第二开关晶体管 T2 的源极与数据信号端 Data相连， 第二开关晶体管 T2的漏极与第一电容 Cstl 的第二端 χ2相连；
第二电容 Cst2的第二端 y2分别与第一参考信号端 Refl、 驱动子模块 1 的第二端 lb和触控侦测子模块 3的第二端 3b相连。
例如， 第一开关晶体管 T1可以为 N型晶体管， 如图 2a、 图 2b、 图 5a 和图 5b所示； 第一开关晶体管 T1也可以为 P型晶体管， 如图 3a、 图 3b、 图 4a和图 4b所示， 在此不做限定。 当第一开关晶体管 T1为 N型晶体管时， 在复位信号端 Reset的信号为高电平时， 第一开关晶体管 T1处于开启状态； 当第一开关晶体管 T1为 P型晶体管时，在复位信号端 Reset的信号为低电平 时， 第一开关晶体管 T1处于开启状态。
例如， 第二开关晶体管 T2可以为 N型晶体管， 如图 2a、 图 2b、 图 5a 和图 5b所示； 第二开关晶体管 T2也可以为 P型晶体管， 如图 3a、 图 3b、 图 4a和图 4b所示， 在此不做限定。 当第二开关晶体管 T2为 N型晶体管时， 在扫描信号端 Scan的信号为高电平时， 第二开关晶体管 T2处于开启状态； 当第二开关晶体管 T2为 P型晶体管时， 在扫描信号端 Scan的信号为低电平 时， 第二开关晶体管 T2处于开启状态。 例如，在本发明实施例提供的上述像素电路中， 为了保证驱动晶体管 TO 能够正常工作， 当驱动晶体管 TO为 N型晶体管时， 数据信号端 Data在数据 写入阶段的信号应该为高电平信号； 当驱动晶体管 TO为 P型晶体管时， 数 据信号端 Data在数据写入阶段的信号应该为低电平信号。
例如， 在本发明实施例提供的上述像素电路中， 触控侦测子模块 3， 如 图 2a、 图 2b、 图 3a、 图 3b、 图 4a、 图 4b、 图 5a和图 5b所示， 还可以包括： 第三开关晶体管 T3和第四开关晶体管 T4。
第三开关晶体管 Τ3的栅极与触控控制信号端 Select相连， 第三开关晶 体管 T3的漏极与光敏器件的第一端 pi相连；
第三开关晶体管 T3的源极与驱动子模块 1的第一端 la相连， 光敏器件 的第二端 p2与第一参考信号端 Refl相连， 如图 2a、 图 3a、 图 4a和图 5a所 示； 或， 第三开关晶体管 T3的源极与第一参考信号端 Refl相连， 光敏器件 的第二端 p2与驱动子模块 1的第一端 la相连， 如图 2b、 图 3b、 图 4b和图 5b所示；
第四开关晶体管 T4的栅极与触控控制信号端 Select相连， 第四开关晶 体管 T4的源极与驱动子模块 1的第三端 lc相连， 第四开关晶体管 T4的漏 极与触控信号读取端 Sensor相连。
例如， 本发明实施例提供的上述像素电路中， 如图 2a、 图 2b、 图 3a、 图 3b、 图 4a、 图 4b、 图 5a和图 5b所示， 光敏器件具体可以为光电二极管 PD ( Photo Diode ) ， 所用器件简单， 实现方便且成本低。
在上述触控侦测子模块 3中，光电二极管 PD和第三晶体管 T3的位置是 可以互换的。 为了保证光电二极管 PD工作时处于反向偏压的状态， 在驱动 晶体管 TO为 N型晶体管时，光电二极管 PD的阴极与第三开关晶体管 T3的 漏极相连， 光电二极管 PD的阳极与第一参考信号端 Refl相连， 如图 2a和 图 3a所示； 或者， 光电二极管 PD和第三晶体管 T3互换位置， 如图 2b和图 3b所示， 光电二极管 PD的阳极与第三开关晶体管 T3的漏极相连， 光电二 极管 PD的阴极与驱动晶体管 TO的栅极相连。 在驱动晶体管 TO为 P型晶体 管时， 光电二极管 PD的阳极与第三开关晶体管 T3的漏极相连， 光电二极管 PD的阴极与第一参考信号端 Refl相连， 如图 4a和图 5a所示； 或者， 光电 二极管 PD和第三晶体管 T3互换位置， 如图 4b和图 5b所示， 光电二极管 PD的阴极与第三开关晶体管 T3的漏极相连， 光电二极管 PD的阳极与驱动 晶体管 TO的栅极相连。
需要说明的是， 光电二极管 PD在反向偏压且有光照时才会开启。 光电 二极管 PD的工作原理为： 处于反向偏压的光电二极管 PD在有光照时， 即 无触摸时， 在光电效应的作用下光电二极管 PD产生光生载流子， 形成较大 的反向电流， 照射到光电二极管 PD的光强越大， 光电二极管 PD产生的反 向电流越大。
例如，第三开关晶体管 T3和第四开关晶体管 T4可以为 N型晶体管，如 图 2a、 图 2b、 图 5a和图 5b所示； 第三开关晶体管 T3和第四开关晶体管 T4 也可以为 P型晶体管， 如图 3a、 图 3b、 图 4a和图 4b所示， 在此不做限定。
例如， 当第三开关晶体管 T3和第四开关晶体管 T4为 N型晶体管时，在 触控控制信号端 Select的信号为高电平时， 第三开关晶体管 T3和第四开关 晶体管 T4处于开启状态； 当第三开关晶体管 T3和第四开关晶体管 T4为 P 型晶体管时， 在触控控制信号端 Select的信号为低电平时， 第三开关晶体管 T3和第四开关晶体管 T4处于开启状态。
例如， 在本发明实施例提供的上述像素电路中， 发光控制子模块 4， 如 图 2a、 图 2b、 图 3a、 图 3b、 图 4a、 图 4b、 图 5a和图 5b所示， 还可以具体 包括： 第五开关晶体管 T5。
第五开关晶体管 Τ5的栅极与发光控制信号端 ΕΜ相连， 第五开关晶体 管 Τ5的漏极与发光器件的第一端 zl相连； 第五开关晶体管 T5的源极与驱 动子模块 1的第三端 lc相连；
发光器件的第二端 z2与第二参考信号端 Ref2相连， 如图 2a、 图 3a、 图 4a和图 5a所示， 或， 第五开关晶体管 T5的源极与第二参考信号端 Ref2相 连；发光器件的第二端 z2与驱动子模块 1的第三端 lc相连，如图 2b、图 3b、 图 4b和图 5b所示。
例如， 本发明实施例提供的上述像素电路中的发光器件一般为有机发光 二极管（OLED )， 发光器件在驱动晶体管 TO开态电流的作用下实现发光显 示。
例如， 在上述发光控制子模块 4中， OLED和第五开关晶体管 T5的位 置时可以互换的， 为了保证 OLED能够正常发光， 在驱动晶体管 TO为 N型 晶体管时， OLED的阴极与第五开关晶体管 T5的漏极相连， OLED的阳极与 第二参考信号端 Ref2相连， 如图 2a和图 3a所示； 或者， OLED和第五开关 晶体管 T5互换位置， 如图 2b和图 3b所示， OLED的阳极与第五开关晶体 管 T5的漏极相连， OLED的阴极与驱动子模块 1的第三端 lc相连。 在驱动 晶体管 TO为 P型晶体管时， OLED的阳极与第五开关晶体管 T5的漏极相连， OLED的阴极与第二参考信号端 Ref2相连，如图 4a和图 5a所示；或者， OLED 和第五开关晶体管 T5互换位置， 如图 4b和图 5b所示， OLED的阴极与第 五开关晶体管 T5的漏极相连， OLED的阳极与驱动子模块 1的第三端 1相 连。
例如， 第五开关晶体管 T5可以为 N型晶体管， 如图 2a、 图 2b、 图 5a 和图 5b所示； 第五开关晶体管 T5也可以为 P型晶体管， 如图 3a、 图 3b、 图 4a和图 4b所示， 在此不做限定。 当第五开关晶体管 T5为 N型晶体管时， 在发光控制信号端 EM输出的信号为高电平时， 第五开关晶体管 T5处于开 启状态； 当第五开关晶体管 T5为 P型晶体管时， 在发光控制信号端 EM输 出的信号为低电平时， 第五开关晶体管 T5处于开启状态。
需要说明的是在本发明实施例提供的上述像素电路中， 提到的驱动晶体 管和开关晶体管可以是薄膜晶体管（TFT， Thin Film Transistor ) ， 也可以是 金属氧化物半导体场效应管（MOS， Metal Oxide Semiconductor )， 在此不做 限定。 并且这些晶体管的源极和漏极可以互换， 不做具体区分。 原理进行详细的说明。 在以下实例中， 当驱动晶体管 TO为 N型晶体管时， 第一参考信号端 Refi 的电压值 Vss 0， 第二参考信号端 Ref2 的电压值 VDD>0; 当驱动晶体管 TO为 P型晶体管时， 第一参考信号端 Refl的电压值 VDD>0, 第二参考信号端 Ref2的电压值 Vss 0。
实例一：
如图 2a和图 2b所示， 驱动晶体管 TO为 N型晶体管， 第一晶体管 Tl、 第二开关晶体管 Τ2、 第三开关晶体管 Τ3、 第四开关晶体管 Τ4和第五开关晶 体管 Τ5也为 Ν型晶体管。 图 2c为图 2a和图 2b的电路时序图， 其中， 扫描 信号端 Scan的电压为 VSean， 数据信号端 Data的电压为 VData， 复位信号端 Reset的电压为 VReset， 触控控制信号端 Select的电压为 VSeleet， 发光控制信号 端 EM的电压为 VEM， 驱动晶体管 TO的栅极在有触摸时电压为 VA1， 驱动晶 体管 TO的栅极在无触摸时电压为 VA2。
像素电路的工作原理如下：
在触控阶段的初始化阶段即触控阶段的第一阶段 1， 此时， 复位信号端 Reset的电压 VReset处于高电平， 触控控制信号端 Select的电压 VSelect和发光 控制信号端 EM的电压 VEM处于低电平，第一开关晶体管 T1处于开启状态， 第三开关晶体管 T3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5处于关闭 状态。 开启的第一开关晶体管 T1使驱动晶体管 TO变为二极管的连接方式。 扫描信号端 Scan的电压 VScan由短暂的高电平变为低电平， 同时数据信号端 Data的电压 VData与扫描信号端的电压同步的由短暂的高电平变为低电平，使 变为二极管连接方式的驱动晶体管 TO导通。 这时， 第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连，第二电容 Cst2第二端 y2的电压为 Vss。 同时， 第一参考信号端 Refl的电压 Vss经驱动晶体管 TO和第一开关晶体管 T1开始对第二电容 Cst2充电， 充至第二电容 Cst2的第一端 yl的电压值 VA 为 νδδ+νΛ时驱动晶体管 TO关闭， 其中， 驱动晶体管 TO的阔值电压为 νώ， 此时， 第二电容 Cst2上的电压差为 νΛ， 实现了在第二电容 Cst2的第一端 yl 处驱动晶体管 TO的阔值电压的存储， 使数据写入子模块 2处于初始化状态。 此时， 光电二极管 PD处于断开状态， 无论光电二极管 PD有无触摸， 驱动 晶体管 το的栅极电压 vA1和 vA2都为 νδδ+νΛ。
在触控阶段的数据写入阶段即触控阶段的第二阶段 2, 此时， 扫描信号 端 Scan的电压 VS(;an和数据信号端 Data的电压 VData处于高电平， 复位信号 端 Reset的电压 VReset， 触控控制信号端 Select的电压 VSelec;t以及发光控制信 号端 EM的电压 VEM处于低电平， 第二开关晶体管 T2处于开启状态， 第一 开关晶体管 Tl、 第三开关晶体管 Τ3、第四开关晶体管 Τ4以及第五开关晶体 管 Τ5处于关闭状态。第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl 相连， 第二电容 Cst2的第二端 y2的电压为 Vss。 由数据信号端 Data输出的 数据信号 VData通过第二开关晶体管 T2的源极写入与其漏极连接的第一电容 Cstl的第二端 x2， 使第一电容 Cstl的第二端 x2的电压变为 VData， 此时， 第 一电容 Cstl和第二电容 Cst2在其连接处即第二电容 Cst2的第一端 y 1处的耦 合电压为 VData[Cl/ ( C1+C2 ) ]+Vss+Vth， 其中 C1和 C2分别为第一电容 Cstl 和第二电容 Cst2的电容值。 第二电容 C2的第一端 yl与驱动晶体管 TO的栅 极相连， 驱动晶体管 TO的栅极的电压也为 VData[Cl/ ( C1+C2 ) ]+νδδ+νΛ， 即在驱动晶体管 TO的栅极实现了数据写入。此阶段， 光电二极管 PD处于断 开状态， 无论光电二极管 PD有无触摸， 驱动晶体管 TO的栅极电压 ^和 VA2都为 VData[Cl/ ( C1+C2 ) ]+νδδ+νΛ。
在触控阶段的触控侦测阶段即触控阶段的第三阶段 3， 此时， 触控控制 信号端 Select的电压 VSelec;t处于高电平， 复位信号端 Reset的电压 VReset， 扫 描信号端 Scan的电压 VS(;an，数据信号端 Data的电压 VData以及发光控制信号 端 EM的电压 VEM处于低电平，第三开关晶体管 T3和第四开关晶体管 T4处 于开启状态， 第一开关晶体管 Tl、 第二开关晶体管 Τ2、 以及第五开关晶体 管 Τ5处于关闭状态。
此时， 若光电二极管 PD无光照即有触摸， 光电二极管 PD处于断开状 态， 驱动晶体管 TO的栅极电压 VA 保持为 VData[Cl/ ( C1+C2 ) ]+νδδ+νΛ， 使驱动晶体管 TO处于开启状态， 第一参考信号端 Refl的电压 Vss输入到驱 动晶体管 TO的源极， 经驱动晶体管 TO的漏极输出触控侦测信号， 该触控侦 测信号又经开启的第四开关晶体管 T4输出到触控信号读取端 Sensor。
此时， 若光电二极管 PD处于光照下即无触摸， 在光电效应的作用下光 电二极管 PD产生光生载流子， 形成的反向电流使第一电容 Cstl和第二电容 Cst2上的电荷减少， 导致输入到驱动晶体管 TO的栅极电压 下降， 进而 导致由驱动晶体管 TO输出的、且经第四开关晶体管 T4输出到触控信号读取 端 Sensor的触控侦测信号变小。该触控侦测信号的大小与照射到该光电二极 管 PD的光强有关， 光强越大， 触控侦测信号越小。
在显示阶段的初始化阶段即显示阶段的第一阶段 1， 此时， 复位信号端 Reset的电压 VReset处于高电平， 触控控制信号端 Select的电压 VSelect和发光 控制信号端 EM的电压 VEM处于低电平，第一开关晶体管 T1处于开启状态， 第三开关晶体管 T3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5处于关闭 状态。 开启的第一开关晶体管 T1使驱动晶体管 TO变为二极管的连接方式。 扫描信号端 Scan的电压 VS(;an由短暂的高电平变为低电平， 同时数据信号端 Data的电压 VData与扫描信号端的电压同步的由短暂的高电平变为低电平，使 变为二极管连接方式的驱动晶体管 T0导通。 这时， 第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连，第二电容 Cst2第二端 y2的电压为 Vss。 同时， 第一参考信号端 Refl的电压 Vss经驱动晶体管 TO和第一开关晶体管 T1开始对第二电容 Cst2充电， 充至第二电容 Cst2的第一端 yl的电压值 VA 为 νδδ+νΛ时驱动晶体管 TO关闭， 其中， 驱动晶体管 TO的阔值电压为 νώ， 此时， 第二电容 Cst2上的电压差为 νΛ， 实现了在第二电容 Cst2的第一端 yl 处驱动晶体管 TO的阔值电压的存储， 使数据写入子模块 2处于初始化状态。
在显示阶段的数据写入阶段即显示阶段的第二阶段 2, 此时， 扫描信号 端 Scan的电压 VS(;an和数据信号端 Data的电压 VData处于高电平， 复位信号 端 Reset的电压 VReset， 触控控制信号端 Select的电压 VSelec;t以及发光控制信 号端 EM的电压 VEM处于低电平， 第二开关晶体管 T2处于开启状态， 第一 开关晶体管 Tl、 第三开关晶体管 Τ3、第四开关晶体管 Τ4以及第五开关晶体 管 Τ5处于关闭状态。第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl 相连， 第二电容 Cst2的第二端 y2的电压变为 Vss。 由数据信号端 Data输出 的数据信号 VData通过第二开关晶体管 T2的源极写入与其漏极连接的第一电 容 Cstl的第二端 x2， 使第一电容 Cstl的第二端 x2的电压变为 VData， 此时， 第一电容 Cstl和第二电容 Cst2在其连接处即第二电容 Cst2的第一端 y 1处的 耦合电压为 VData[Cl/ ( C1+C2 ) ]+Vss+Vth， 其中 C1和 C2分别为第一电容 Cstl和第二电容 Cst2的电容值。 第二电容 C2的第一端 yl与驱动晶体管 TO 的栅极相连，驱动晶体管 TO的栅极的电压也为 vData[ci/( ci+C2 )]+νδδ+νΛ， 即在驱动晶体管 TO的栅极实现了数据写入。
在显示阶段的的发光驱动阶段即显示阶段的第三阶段 3， 此时， 发光控 制信号端 EM的电压 VEM处于高电平， 复位信号端 Reset的电压 VReset， 扫描 信号端 Scan的电压 VS(;an，数据信号端 Data的电压 VData以及触控控制信号端 Select的电压 VSelec;t处于低电平， 第一开关晶体管 Tl、 第二开关晶体管 Τ2、 第三开关晶体管 Τ3、 以及第四开关晶体管 Τ4处于关闭状态， 第五开关晶体 管 Τ5 处于开启状态， OLED 导通。 驱动晶体管 TO 的栅极电压仍保持为 VData[Cl/ ( C1+C2 ) ]+νδδ+νΛ， 此时， 驱动晶体管 TO的栅极和源极之间的电 压为 Vgs=Vg-Vs=VData[Cl/ ( C1+C2 ) ]+νΛ+νδδ-νδδ=ν0αΐί1[ϋ1/ ( C1+C2 ) ]+νΛ。
由于驱动晶体管 TO工作处于饱和状态， 根据饱和状态电流特性可知， 驱动晶体管 T0 的开态电流 id 满足公式： id=K(Vgs-Vth)2=K{ VData[Cl/ ( C1+C2 ) ]+νΛ-νΛ}2=Κ{ν0αΐί1[ϋ1/ ( C1+C2 ) ]}2, 其中 K为结构参数， 相同 结构中此数值相对稳定， 可以算作常量。 从公式推导可知， 流经驱动晶体管 TO的漏电流仅与数据信号端的电压 VData以及第一电容 Cstl和第二电容 Cst2 的电容值有关， 与驱动晶体管 TO的阔值电压 νΛ无关。 因此， 用该开态电流 id驱动发光器件发光， 流经各 OLED的电流相对均匀， 不会因背板制造工艺 的原因导致阔值电压 νΛ不均匀而引起流经各 OLED的电流不同， 造成亮度 不均匀。
综上， 上述像素电路在触控阶段， 当光电二极管 PD在有触摸时， 触控 信号读取端 Sensor输出的触控感测信号比在无触摸时触控信号读取端 Sensor 输出的触控感测信号大， 通过分析像素电路输出的触控感测信号大小可以确 定触摸屏有无触摸， 进而确定出触点的位置， 实现了触控侦测功能。 上述像 素电路在显示阶段， 通过将驱动晶体管 TO 的阔值电压 νΛ存储于第二电容 Cst2上， 保证了 OLED发光的驱动电压与数据信号的电压 VDATA有关， 与驱 动晶体管 TO的阔值电压 νΛ无关， 避免了阔值电压 νΛ对 OLED的影响， 即 在使用相同的数据信号加载到不同的像素单元时，能够得到亮度相同的图像， 提高了显示装置显示区域图像亮度的均匀性。
实例二：
如图 3a和图 3b所示， 驱动晶体管 TO为 N型晶体管， 第一晶体管 Tl、 第二开关晶体管 Τ2、 第三开关晶体管 Τ3、 第四开关晶体管 Τ4和第五开关晶 体管 Τ5、 为 Ρ型晶体管。 图 3c为图 3a和图 3b的电路时序图， 其中， 扫描 信号端 Scan的电压为 VSean， 数据信号端 Data的电压为 VData， 复位信号端 Reset的电压为 VReset， 触控控制信号端 Select的电压为 VSelec;t， 发光控制信号 端 EM的电压为 VEM， 驱动晶体管 TO的栅极在有触摸时电压为 VA1， 驱动晶 体管 TO的栅极在无触摸时电压为 VA2。
像素电路的工作原理如下：
在触控阶段的初始化阶段即触控阶段的第一阶段 1， 此时， 复位信号端 Reset的电压 VReset处于低电平， 触控控制信号端 Select的电压 VSelect和发光 控制信号端 EM的电压 VEM处于高电平，第一开关晶体管 T1处于开启状态， 第三开关晶体管 T3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5处于关闭 状态。 开启的第一开关晶体管 T1使驱动晶体管 Τ0变为二极管的连接方式。 扫描信号端 Scan的电压 VScan由短暂的低电平变为高电平， 同时数据信号端 Data的电压 VData与扫描信号端的电压同步的由短暂的高电平变为低电平，使 变为二极管连接方式的驱动晶体管 TO导通。 这时， 第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连，第二电容 Cst2第二端 y2的电压为 Vss。 同时， 第一参考信号端 Refl的电压 Vss经驱动晶体管 TO和第一开关晶体管 T1开始对第二电容 Cst2充电， 充至第二电容 Cst2的第一端 yl的电压值 VA 为 νδδ+νΛ时驱动晶体管 TO关闭， 其中， 驱动晶体管 TO的阔值电压为 νώ， 此时， 第二电容 Cst2上的电压差为 νΛ， 实现了在第二电容 Cst2的第一端 yl 处驱动晶体管 TO的阔值电压的存储， 使数据写入子模块 2处于初始化状态。 此时， 光电二极管 PD处于断开状态， 无论光电二极管 PD有无触摸， 驱动 晶体管 TO的栅极电压 VA1和 VA2都为 Vss+Vth。
在触控阶段的数据写入阶段即触控阶段的第二阶段 2, 此时， 扫描信号 端 Scan的电压 VS(;an处于低电平，数据信号端 Data的电压 VData， 复位信号端 Reset的电压 VReset，触控控制信号端 Select的电压 VSelec;t以及发光控制信号端 EM的电压 VEM处于高电平，第二开关晶体管 T2处于开启状态，第一开关晶 体管 Tl、 第三开关晶体管 Τ3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5 处于关闭状态。第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连， 第二电容 Cst2的第二端 y2的电压变为 Vss。 由数据信号端 Data输出的数据 信号 VData通过第二开关晶体管 T2的源极写入与其漏极连接的第一电容 Cstl 的第二端 x2， 使第一电容 Cstl的第二端 x2的电压变为 VData， 此时， 第一电 容 Cstl和第二电容 Cst2在其连接处即第二电容 Cst2的第一端 y 1处的耦合电 压为 VData[Cl/ ( C1+C2 ) ]+Vss+Vth， 其中 CI和 C2分别为第一电容 Cstl和 第二电容 Cst2的电容值。 第二电容 C2的第一端 yl与驱动晶体管 TO的栅极 相连， 驱动晶体管 TO的栅极的电压也为 VData[Cl/ ( C1+C2 ) ]+νδδ+νΛ， 即 在驱动晶体管 TO的栅极实现了数据写入。此阶段， 光电二极管 PD处于断开 状态， 无论光电二极管 PD有无触摸， 驱动晶体管 TO的栅极电压 VA1和 VA2 都为 VData[Cl/ ( C1+C2 ) ]+νδδ+νΛ。
在触控阶段的触控侦测阶段即触控阶段的第三阶段 3， 此时， 数据信号 端 Data的电压 VData和触控控制信号端 Select的电压 VSelec;t处于低电平，复位 信号端 Reset的电压 VReset， 扫描信号端 Scan的电压 VS(;an， 以及发光控制信 号端 EM的电压 VEM处于高电平， 第三开关晶体管 T3和第四开关晶体管 T4 处于开启状态， 第一开关晶体管 Tl、 第二开关晶体管 Τ2、 以及第五开关晶 体管 Τ5处于关闭状态。
此时， 若光电二极管 PD无光照即有触摸， 光电二极管 PD处于断开状 态， 驱动晶体管 TO的栅极电压 ^仍保持为 VData[Cl/ ( C1+C2 ) ]+Vss+Vth， 使驱动晶体管 TO处于开启状态， 第一参考信号端 Refl的电压 Vss输入到驱 动晶体管 TO的源极， 经驱动晶体管 TO的漏极输出触控侦测信号， 该触控侦 测信号又经开启的第四开关晶体管 T4输出到触控信号读取端 Sensor。
此时， 若光电二极管 PD处于光照下即无触摸， 在光电效应的作用下光 电二极管 PD产生光生载流子， 形成的反向电流使第一电容 Cstl和第二电容 Cst2上的电荷减少， 导致输入到驱动晶体管 TO的栅极电压 VA2下降， 进而 导致由驱动晶体管 TO输出的、且经第四开关晶体管 T4输出到触控信号读取 端 Sensor的触控侦测信号变小。该触控侦测信号的大小与照射到该光电二极 管 PD的光强有关， 光强越大， 触控侦测信号越小。
在显示阶段的初始化阶段即显示阶段的第一阶段 1， 此时， 复位信号端
Reset的电压 VReset处于低电平， 触控控制信号端 Select的电压 VSelect和发光 控制信号端 EM的电压 VEM处于高电平，第一开关晶体管 T1处于开启状态， 第三开关晶体管 T3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5处于关闭 状态。 开启的第一开关晶体管 T1使驱动晶体管 TO变为二极管的连接方式。 扫描信号端 Scan的电压 VScan由短暂的低电平变为高电平， 同时数据信号端 Data的电压 VData与扫描信号端的电压同步的由短暂的高电平变为低电平，使 变为二极管连接方式的驱动晶体管 TO导通。 这时， 第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连，第二电容 Cst2第二端 y2的电压为 Vss。 同时， 第一参考信号端 Refl的电压 Vss经驱动晶体管 TO和第一开关晶体管 T1开始对第二电容 Cst2充电， 充至第二电容 Cst2的第一端 yl的电压值 VA 为 νδδ+νΛ时驱动晶体管 TO关闭， 其中， 驱动晶体管 TO的阔值电压为 νώ， 此时， 第二电容 Cst2上的电压差为 νΛ， 实现了在第二电容 Cst2的第一端 yl 处驱动晶体管 TO的阔值电压的存储， 使数据写入子模块 2处于初始化状态。
在显示阶段的数据写入阶段即显示阶段的第二阶段 2, 此时， 扫描信号 端 Scan的电压 VS(;an处于低电平，数据信号端 Data的电压 VData， 复位信号端 Reset的电压 VReset，触控控制信号端 Select的电压 VSelec;t以及发光控制信号端 EM的电压 VEM处于高电平，第二开关晶体管 T2处于开启状态，第一开关晶 体管 Tl、 第三开关晶体管 Τ3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5 处于关闭状态。第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连， 第二电容 Cst2的第二端 y2的电压变为 Vss。 由数据信号端 Data输出的数据 信号 VData通过第二开关晶体管 T2的源极写入与其漏极连接的第一电容 Cstl 的第二端 x2， 使第一电容 Cstl的第二端 x2的电压变为 VData， 此时， 第一电 容 Cstl和第二电容 Cst2在其连接处即第二电容 Cst2的第一端 y 1处的耦合电 压为 VData[Cl/ ( C1+C2 ) ]+Vss+Vth， 其中 CI和 C2分别为第一电容 Cstl和 第二电容 Cst2的电容值。 第二电容 C2的第一端 yl与驱动晶体管 TO的栅极 相连， 驱动晶体管 TO的栅极的电压也为 VData[Cl/ ( C1+C2 ) ]+νδδ+νΛ， 即 在驱动晶体管 TO的栅极实现了数据写入。
在显示阶段的发光驱动阶段即显示阶段的第三阶段 3， 此时， 数据信号 端 Data的电压 VData和发光控制信号端 EM的电压 VEM处于低电平， 复位信 号端 Reset的电压 VReset， 扫描信号端 Scan的电压 VS(;an， 以及触控控制信号 端 Selsct的电压 VSelec;t处于高电平，第一开关晶体管 T1、第二开关晶体管 T2、 第三开关晶体管 Τ3、 以及第四开关晶体管 Τ4处于关闭状态， 第五开关晶体 管 Τ5 处于开启状态， OLED 导通。 驱动晶体管 TO 的栅极电压仍保持为 vData[ci/ ( C1+C2 ) ]+νδδ+νΛ， 此时， 驱动晶体管 TO的源极和栅极之间的电 压为 Vgs=Vg-Vs=VData[Cl/ ( C1+C2 ) ]+Vss+Vth-Vss=VData[Cl/ ( C1+C2 ) ]+νΛ。
由于驱动晶体管 TO工作处于饱和状态， 根据饱和状态电流特性可知， 驱动晶体管 TO 的开态电流 id 满足公式：
Figure imgf000020_0001
( C1+C2 ) ]+νΛ-νΛ}2=Κ{ν0αΐί1[ϋ1/ ( C1+C2 ) ]}2, 其中 Κ为结构参数， 相同 结构中此数值相对稳定， 可以算作常量。 从公式推导可知， 流经驱动晶体管 TO的漏电流仅与数据信号端的电压 VData以及第一电容 Cstl和第二电容 Cst2 的电容值有关， 与驱动晶体管 TO的阔值电压 νΛ无关。 因此， 用该开态电流 id驱动发光器件发光， 流经各 OLED的电流相对均匀， 不会因背板制造工艺 的原因导致阔值电压 νΛ不均匀而引起流经各 OLED的电流不同， 造成亮度 不均匀。
综上， 上述像素电路在触控阶段， 当光电二极管 PD在有触摸时， 触控 信号读取端 Sensor输出的触控感测信号比在无触摸时触控信号读取端输出的 触控感测信号大， 通过分析像素电路输出的触控感测信号大小可以确定触摸 屏有无触摸， 进而确定出触点的位置， 实现了触控侦测功能。 上述像素电路 在显示阶段， 通过将驱动晶体管 TO的阔值电压 νΛ的存储于第二电容 Cst2 上， 保证了 OLED发光的驱动电压与数据信号的电压 VDATA有关， 与驱动晶 体管 TO的阔值电压 νΛ无关， 避免了阔值电压 νΛ对 OLED的影响， 即在使 用相同的数据信号加载到不同的像素单元时， 能够得到亮度相同的图像， 提 高了显示装置显示区域图像亮度的均匀性。
实例三：
如图 4a和图 4b所示， 驱动晶体管 TO为 P型晶体管， 第一晶体管 Tl、 第二开关晶体管 Τ2、 第三开关晶体管 Τ3、 第四开关晶体管 Τ4和第五开关晶 体管 Τ5也为 Ρ型晶体管。 图 4c为图 4a和图 4b的电路时序图， 其中， 扫描 信号端 Scan的电压为 VSean， 数据信号端 Data的电压为 VData， 复位信号端 Reset的电压为 VReset， 触控控制信号端 Select的电压为 VSelec;t， 发光控制信号 端 EM的电压为 VEM， 驱动晶体管 TO的栅极在有触摸时电压为 VA1， 驱动晶 体管 TO的栅极在无触摸时电压为 VA
像素电路的工作原理如下：
在触控阶段的初始化阶段即触控阶段的第一阶段 1， 此时， 复位信号端 Reset的电压 VReset处于低电平， 触控控制信号端 Select的电压 VSelect和发光 控制信号端 EM的电压 VEM处于高电平，第一开关晶体管 T1处于开启状态， 第三开关晶体管 T3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5处于关闭 状态。 开启的第一开关晶体管 T1使驱动晶体管 TO变为二极管的连接方式。 扫描信号端 Scan的电压 VScan由短暂的低电平变为高电平， 同时数据信号端 Data的电压 VData与扫描信号端的电压同步的由短暂的低电平变为高电平，使 变为二极管连接方式的驱动晶体管 TO导通。 这时， 第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连，第二电容 Cst2第二端 y2的电压为 VDD。 同时， 第一参考信号端 Refl的电压 VDD经驱动晶体管 TO和第一开关晶体管 T1开始对第二电容 Cst2充电， 充至第二电容 Cst2的第一端 yl的电压值 VA 为 ν∞+νΛ时驱动晶体管 TO关闭， 其中， 驱动晶体管 TO的阔值电压为 νΛ， 此时， 第二电容 Cst2上的电压差为 νΛ， 实现了在第二电容 Cst2的第一端 yl 处驱动晶体管 TO的阔值电压的存储， 使数据写入子模块 2处于初始化状态。 此时， 光电二极管 PD处于断开状态， 无论光电二极管 PD有无触摸， 驱动 晶体管 TO的栅极电压 VA1和 VA2都为 ν∞+νΛ。
在触控阶段的数据写入阶段即触控阶段的第二阶段 2, 此时， 扫描信号 端 Scan的电压 VS(;an和数据信号端 Data的电压 VData处于低电平， 复位信号 端 Reset的电压 VReset， 触控控制信号端 Select的电压 VSelec;t以及发光控制信 号端 EM的电压 VEM处于高电平， 第二开关晶体管 T2处于开启状态， 第一 开关晶体管 Tl、 第三开关晶体管 Τ3、第四开关晶体管 Τ4以及第五开关晶体 管 Τ5处于关闭状态。第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl 相连， 第二电容 Cst2的第二端 y2的电压为 VDD。 由数据信号端 Data输出的 数据信号 VData通过第二开关晶体管 T2的源极写入与其漏极连接的第一电容 Cstl的第二端 x2， 使第一电容 Cstl的第二端 x2的电压变为 VData， 此时， 第 一电容 Cstl和第二电容 Cst2在其连接处即第二电容 Cst2的第一端 y 1处的耦 合电压为 VData[Cl/ ( C1+C2 ) ]+VDD+Vth，其中 C1和 C2分别为第一电容 Cstl 和第二电容 Cst2的电容值。 第二电容 C2的第一端 yl与驱动晶体管 TO的栅 极相连， 驱动晶体管 το的栅极的电压也为 vData[ci/ ( ci+C2 ) ]+ν∞+νΛ， 即在驱动晶体管 TO的栅极实现了数据写入。此阶段， 光电二极管 PD处于断 开状态， 无论光电二极管 PD有无触摸， 驱动晶体管 TO的栅极电压 ^和 VA2都为 VData[Cl/ ( C1+C2 ) ]+ν∞+νΛ。
在触控阶段的触控侦测阶段即触控阶段的第三阶段 3， 此时， 触控控制 信号端 Select的电压 VSelec;t处于低电平， 复位信号端 Reset的电压 VReset， 扫 描信号端 Scan的电压 VS(;an，数据信号端 Data的电压 VData以及发光控制信号 端 EM的电压 VEM处于高电平，第三开关晶体管 T3和第四开关晶体管 T4处 于开启状态， 第一开关晶体管 Tl、 第二开关晶体管 Τ2、 以及第五开关晶体 管 Τ5处于关闭状态。
此时， 若光电二极管 PD无光照即有触摸， 光电二极管 PD处于断开状 态， 驱动晶体管 TO的栅极电压 VA 保持为 VData[Cl/ ( C1+C2 ) ]+ν00+νΛ， 使驱动晶体管 TO处于开启状态， 第一参考信号端 Refl的电压 VDD输入到驱 动晶体管 TO的源极， 经驱动晶体管 TO的漏极输出触控侦测信号， 该触控侦 测信号又经开启的第四开关晶体管 T4输出到触控信号读取端 Sensor。 此时， 若光电二极管 PD处于光照下即无触摸， 在光电效应的作用下光 电二极管 PD产生光生载流子， 形成的反向电流使第一电容 Cstl和第二电容 Cst2上的电荷增加， 导致输入到驱动晶体管 TO的栅极电压 VA2上升， 进而 导致由驱动晶体管 TO输出的、且经第四开关晶体管 T4输出到触控信号读取 端 Sensor的触控侦测信号变小。该触控侦测信号的大小与照射到该光电二极 管 PD的光强有关， 光强越大， 触控侦测信号越小。
在显示阶段的初始化阶段即显示阶段的第一阶段 1， 此时， 复位信号端 Reset的电压 VReset处于低电平， 触控控制信号端 Select的电压 VSelect和发光 控制信号端 EM的电压 VEM处于高电平，第一开关晶体管 T1处于开启状态， 第三开关晶体管 T3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5处于关闭 状态。 开启的第一开关晶体管 T1使驱动晶体管 TO变为二极管的连接方式。 扫描信号端 Scan的电压 VScan由短暂的低电平变为高电平， 同时数据信号端 Data的电压 VData与扫描信号端的电压同步的由短暂的低电平变为高电平，使 变为二极管连接方式的驱动晶体管 TO导通。 这时， 第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连，第二电容 Cst2第二端 y2的电压为 VDD。 同时， 第一参考信号端 Refl的电压 VDD经驱动晶体管 TO和第一开关晶体管 T1开始对第二电容 Cst2充电， 充至第二电容 Cst2的第一端 yl的电压值 VA 为 ν∞+νΛ时驱动晶体管 TO关闭， 其中， 驱动晶体管 TO的阔值电压为 νΛ， 此时， 第二电容 Cst2上的电压差为 νΛ， 实现了在第二电容 Cst2的第一端 yl 处驱动晶体管 TO的阔值电压的存储， 使数据写入子模块 2处于初始化状态。
在显示阶段的数据写入阶段即显示阶段的第二阶段 2, 此时， 扫描信号 端 Scan的电压 VS(;an和数据信号端 Data的电压 VData处于低电平， 复位信号 端 Reset的电压 VReset， 触控控制信号端 Select的电压 VSelec;t以及发光控制信 号端 EM的电压 VEM处于高电平， 第二开关晶体管 T2处于开启状态， 第一 开关晶体管 Tl、 第三开关晶体管 Τ3、第四开关晶体管 Τ4以及第五开关晶体 管 Τ5处于关闭状态。第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl 相连， 第二电容 Cst2的第二端 y2的电压变为 VDD。 由数据信号端 Data输出 的数据信号 VData通过第二开关晶体管 T2的源极写入与其漏极连接的第一电 容 Cstl的第二端 x2， 使第一电容 Cstl的第二端 x2的电压变为 VData， 此时， 第一电容 Cstl和第二电容 Cst2在其连接处即第二电容 Cst2的第一端 y 1处的 耦合电压为 VData[Cl/ ( C1+C2 ) ]+VDD+Vth, 其中 CI和 C2分别为第一电容 Cstl和第二电容 Cst2的电容值。 第二电容 C2的第一端 yl与驱动晶体管 TO 的栅极相连，驱动晶体管 TO的栅极的电压也为 VData[Cl/( C1+C2 )]+ν∞+νΛ， 即在驱动晶体管 TO的栅极实现了数据写入。
在显示阶段的的发光驱动阶段即显示阶段的第三阶段 3， 此时， 发光控 制信号端 EM的电压 VEM处于低电平， 复位信号端 Reset的电压 VReset， 扫描 信号端 Scan的电压 VS(;an，数据信号端 Data的电压 VData以及触控控制信号端 Select的电压 VSelec;t处于高电平， 第一开关晶体管 Tl、 第二开关晶体管 Τ2、 第三开关晶体管 Τ3、 以及第四开关晶体管 Τ4处于关闭状态， 第五开关晶体 管 Τ5 处于开启状态， OLED 导通。 驱动晶体管 TO 的栅极电压仍保持为 VData[Cl/ ( C1+C2 ) ]+VDD+Vth， 此时， 驱动晶体管 TO 的源极和栅极之间的 电压为 Vgs=Vg-Vs=VData[Cl/( C1+C2
Figure imgf000024_0001
C1+C2 )]+νΛ。
由于驱动晶体管 TO工作处于饱和状态， 根据饱和状态电流特性可知， 驱动晶体管 TO的开态电流 id满足公式：
Figure imgf000024_0002
Cl+C2 ) ] +νΛ-νΛ}2=Κ{ν0αΐί1[ϋ1/ ( C1+C2 ) ]}2, 其中 Κ为结构参数， 相同结构中此数 值相对稳定， 可以算作常量。 从公式推导可知， 流经驱动晶体管 TO 的漏电 流仅与数据信号端的电压 VData以及第一电容 Cstl和第二电容 Cst2的电容值 有关， 与驱动晶体管 TO的阔值电压 νΛ无关。 因此， 用该开态电流 id驱动发 光器件发光， 流经各 OLED的电流相对均匀， 不会因背板制造工艺的原因导 致阔值电压 νΛ不均匀而引起流经各 OLED的电流不同， 造成亮度不均匀。
综上， 上述像素电路在触控阶段， 当光电二极管 PD在有触摸时， 触控 信号读取端 Sensor输出的触控感测信号比在无触摸时触控信号读取端 Sensor 输出的触控感测信号大， 通过分析像素电路输出的触控感测信号大小可以确 定触摸屏有无触摸， 进而确定出触点的位置， 实现了触控侦测功能。 上述像 素电路在显示阶段， 通过将驱动晶体管 TO 的阔值电压 νΛ存储于第二电容 Cst2上， 保证了 OLED发光的驱动电压与数据信号的电压 VDATA有关， 与驱 动晶体管 TO的阔值电压 νΛ无关， 避免了阔值电压 νΛ对 OLED的影响， 即 在使用相同的数据信号加载到不同的像素单元时，能够得到亮度相同的图像， 提高了显示装置显示区域图像亮度的均匀性。
实例四： 如图 5a和图 5b所示， 驱动晶体管 TO为 P型晶体管， 第一晶体管 Tl、 第二开关晶体管 Τ2、 第三开关晶体管 Τ3、 第四开关晶体管 Τ4和第五开关晶 体管 Τ5为 Ν型晶体管。 图 5c为图 5a和图 5b的电路时序图， 其中， 扫描信 号端 Scan的电压为 VSean，数据信号端 Data的电压为 VData，复位信号端 Reset 的电压为 VReset，触控控制信号端 Select的电压为 VSeleet，发光控制信号端 EM 的电压为 VEM， 驱动晶体管 TO的栅极在有触摸时电压为 VA1， 驱动晶体管 TO的栅极在无触摸时电压为 VA2。
像素电路的工作原理如下：
在触控阶段的初始化阶段即触控阶段的第一阶段 1， 此时， 复位信号端 Reset的电压 VReset处于高电平， 触控控制信号端 Select的电压 VSelect和发光 控制信号端 EM的电压 VEM处于低电平，第一开关晶体管 T1处于开启状态， 第三开关晶体管 T3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5处于关闭 状态。 开启的第一开关晶体管 T1使驱动晶体管 TO变为二极管的连接方式。 扫描信号端 Scan的电压 VScan由短暂的高电平变为低电平， 同时数据信号端 Data的电压 VData与扫描信号端的电压同步的由短暂的低电平变为高电平，使 变为二极管连接方式的驱动晶体管 TO导通。 这时， 第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连， 第二电容 Cst2第二端 y2的电压变为 VDD。 同时， 第一参考信号端 Refl的电压 VDD经驱动晶体管 TO和第一开关 晶体管 T1开始对第二电容 Cst2充电， 充至第二电容 Cst2的第一端 yl的电 压值 VA为 VDD+Vth时驱动晶体管 TO关闭， 其中， 驱动晶体管 TO的阔值电 压为 νΛ， 此时， 第二电容 Cst2上的电压差为 νΛ， 实现了在第二电容 Cst2 的第一端 yl处驱动晶体管 TO的阔值电压的存储， 使数据写入子模块 2处于 初始化状态。 此时， 光电二极管 PD处于断开状态， 无论光电二极管 PD有 无触摸， 驱动晶体管 TO的栅极电压 VA^o VA2都为 ν∞+νΛ。
在触控阶段的数据写入阶段即触控阶段的第二阶段 2, 此时， 扫描信号 端 Scan的电压 VS(;an处于高电平，数据信号端 Data的电压 VData， 复位信号端 Reset的电压 VReset，触控控制信号端 Select的电压 VSelec;t以及发光控制信号端 EM的电压 VEM处于低电平，第二开关晶体管 T2处于开启状态，第一开关晶 体管 Tl、 第三开关晶体管 Τ3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5 处于关闭状态。第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连， 第二电容 Cst2的第二端 y2的电压变为 VDD。 由数据信号端 Data输出的数据 信号 VData通过第二开关晶体管 T2的源极写入与其漏极连接的第一电容 Cstl 的第二端 x2， 使第一电容 Cstl的第二端 x2的电压变为 VData， 此时， 第一电 容 Cstl和第二电容 Cst2在其连接处即第二电容 Cst2的第一端 y 1处的耦合电 压为 VData[Cl/ ( C1+C2 ) ]+VDD+Vth， 其中 C1和 C2分别为第一电容 Cstl和 第二电容 Cst2的电容值。 第二电容 C2的第一端 yl与驱动晶体管 TO的栅极 相连， 驱动晶体管 TO的栅极的电压也为 VData[Cl/ ( C1+C2 ) ]+ν∞+νΛ， 即 在驱动晶体管 TO的栅极实现了数据写入。此阶段， 光电二极管 PD处于断开 状态， 无论光电二极管 PD有无触摸， 驱动晶体管 TO的栅极电压 VA1和 VA2 都为 vData[ci/ ( ci+C2 ) ]+ν∞+νΛ。
在触控阶段的触控侦测阶段即触控阶段的第三阶段 3， 此时， 数据信号 端 Data的电压 VData和触控控制信号端 Select的电压 VSelec;t处于高电平，复位 信号端 Reset的电压 VReset， 扫描信号端 Scan的电压 VS(;an， 以及发光控制信 号端 EM的电压 VEM处于低电平， 第三开关晶体管 T3和第四开关晶体管 T4 处于开启状态， 第一开关晶体管 Tl、 第二开关晶体管 Τ2、 以及第五开关晶 体管 Τ5处于关闭状态。
此时， 若光电二极管 PD无光照即有触摸， 光电二极管 PD处于断开状 态， 驱动晶体管 το的栅极电压 ^仍保持为 vData[ci/ ( ci+C2 ) ]+ν∞+νΛ， 使驱动晶体管 TO处于开启状态， 第一参考信号端 Refl的电压 VDD输入到驱 动晶体管 TO的源极， 经驱动晶体管 TO的漏极输出触控侦测信号， 该触控侦 测信号又经开启的第四开关晶体管 T4输出到触控信号读取端 Sensor。
此时， 若光电二极管 PD处于光照下即无触摸， 在光电效应的作用下光 电二极管 PD产生光生载流子， 形成的反向电流使第一电容 Cstl和第二电容
Cst2上的电荷增加， 导致输入到驱动晶体管 TO的栅极电压 VA2上升， 进而 导致由驱动晶体管 TO输出的、且经第四开关晶体管 T4输出到触控信号读取 端 Sensor的触控侦测信号变小。该触控侦测信号的大小与照射到该光电二极 管 PD的光强有关， 光强越大， 触控侦测信号越小。
在显示阶段的初始化阶段即显示阶段的第一阶段 1， 此时， 复位信号端
Reset的电压 VReset处于高电平， 触控控制信号端 Select的电压 VSelect和发光 控制信号端 EM的电压 VEM处于低电平，第一开关晶体管 T1处于开启状态， 第三开关晶体管 T3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5处于关闭 状态。 开启的第一开关晶体管 T1使驱动晶体管 TO变为二极管的连接方式。 扫描信号端 Scan的电压 VScan由短暂的高电平变为低电平， 同时数据信号端 Data的电压 VData与扫描信号端的电压同步的由短暂的低电平变为高电平，使 变为二极管连接方式的驱动晶体管 TO导通。 这时， 第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连，第二电容 Cst2第二端 y2的电压为 VDD。 同时， 第一参考信号端 Refl的电压 VDD经驱动晶体管 TO和第一开关晶体管 T1开始对第二电容 Cst2充电， 充至第二电容 Cst2的第一端 yl的电压值 VA 为 ν∞+νΛ时驱动晶体管 TO关闭， 其中， 驱动晶体管 TO的阔值电压为 νΛ， 此时， 第二电容 Cst2上的电压差为 νΛ， 实现了在第二电容 Cst2的第一端 yl 处驱动晶体管 TO的阔值电压的存储， 使数据写入子模块 2处于初始化状态。
在显示阶段的数据写入阶段即显示阶段的第二阶段 2, 此时， 扫描信号 端 Scan的电压 VS(;an处于高电平，数据信号端 Data的电压 VData， 复位信号端 Reset的电压 VReset，触控控制信号端 Select的电压 VSelec;t以及发光控制信号端 EM的电压 VEM处于低电平，第二开关晶体管 T2处于开启状态，第一开关晶 体管 Tl、 第三开关晶体管 Τ3、 第四开关晶体管 Τ4以及第五开关晶体管 Τ5 处于关闭状态。第二电容 Cst2的第二端 y2直接与第一参考信号端 Refl相连， 第二电容 Cst2的第二端 y2的电压变为 VDD。 由数据信号端 Data输出的数据 信号 VData通过第二开关晶体管 T2的源极写入与其漏极连接的第一电容 Cstl 的第二端 x2， 使第一电容 Cstl的第二端 x2的电压变为 VData， 此时， 第一电 容 Cstl和第二电容 Cst2在其连接处即第二电容 Cst2的第一端 y 1处的耦合电 压为 VData[Cl/ ( C1+C2 ) ]+VDD+Vth, 其中 C1和 C2分别为第一电容 Cstl和 第二电容 Cst2的电容值。 第二电容 C2的第一端 yl与驱动晶体管 TO的栅极 相连， 驱动晶体管 TO的栅极的电压也为 VData[Cl/ ( C1+C2 ) ]+ν∞+νΛ， 即 在驱动晶体管 TO的栅极实现了数据写入。
在显示阶段的的发光驱动阶段即显示阶段的第三阶段 3， 此时， 数据信 号端 Data的电压 VData和发光控制信号端 EM的电压 VEM处于高电平， 复位 信号端 Reset的电压 VReset， 扫描信号端 Scan的电压 VSean， 以及触控控制信 号端 Selsct的电压 VSelec;t处于低电平， 第一开关晶体管 Tl、 第二开关晶体管 Τ2、 第三开关晶体管 Τ3、 以及第四开关晶体管 Τ4处于关闭状态， 第五开关 晶体管 T5处于开启状态， OLED导通。 驱动晶体管 TO的栅极电压仍保持为 VData[Cl/ ( C1+C2 ) ]+VDD+Vth， 此时， 驱动晶体管 TO 的源极和栅极之间的 电压为 Vgs=Vg-Vs=VData[Cl/( C1+C2
Figure imgf000028_0001
C1+C2 )]+νΛ。
由于驱动晶体管 TO工作处于饱和状态， 根据饱和状态电流特性可知， 驱动晶体管 TO的开态电流 id满足公式： id=K(Vgs-Vth)2=K{VData[Cl/( C1+C2 ) ]
+νΛ-νΛ}2=κ{νθ£4 / ( ci+C2 ) ]}2， 其中 κ为结构参数， 相同结构中此数 值相对稳定， 可以算作常量。 从公式推导可知， 流经驱动晶体管 TO 的漏电 流仅与数据信号端的电压 VData以及第一电容 Cstl和第二电容 Cst2的电容值 有关， 与驱动晶体管 TO的阔值电压 νΛ无关。 因此， 用该开态电流 id驱动发 光器件发光， 流经各 OLED的电流相对均匀， 不会因背板制造工艺的原因导 致阔值电压 νΛ不均匀而引起流经各 OLED的电流不同， 造成亮度不均匀。
综上， 上述像素电路在触控阶段， 当光电二极管 PD在有触摸时， 触控 信号读取端 Sensor输出的触控感测信号比在无触摸时触控信号读取端输出的 触控感测信号大， 通过分析像素电路输出的触控感测信号大小可以确定触摸 屏有无触摸， 进而确定出触点的位置， 实现了触控侦测功能。 上述像素电路 在显示阶段， 通过将驱动晶体管 TO的阔值电压 νΛ的存储于第二电容 Cst2 上， 保证了 OLED发光的驱动电压与数据信号的电压 VDATA有关， 与驱动晶 体管 TO的阔值电压 νΛ无关， 避免了阔值电压 νΛ对 OLED的影响， 即在使 用相同的数据信号加载到不同的像素单元时， 能够得到亮度相同的图像， 提 高了显示装置显示区域图像亮度的均匀性。
基于同一发明构思，本发明实施例还提供了一种有机电致发光显示面板， 包括本发明实施例提供的上述像素电路， 由于该有机电致发光显示面板解决 问题的原理与前述一种像素电路相似， 因此该有机电致发光显示面板的实施 可以参见像素电路的实施， 重复之处不再赘述。
基于同一发明构思， 本发明实施例还提供了一种显示装置， 包括本发明 实施例提供的上述有机电致发光显示面板，该显示装置可以是显示器、手机、 电视、 笔记本、 一体机等， 对于显示装置的其它必不可少的组成部分均为本 领域的普通技术人员应该理解具有的， 在此不做赞述， 也不应作为对本发明 的限制。
本发明实施例提供的一种像素电路、有机电致发光显示面板及显示装置， 该像素电路包括： 驱动子模块， 数据写入子模块， 具有光敏器件的触控侦测 子模块， 以及具有发光器件的发光控制子模块； 其中， 在复位信号端、 扫描 信号端和数据信号端的控制下， 数据写入子模块向驱动子模块的第一端传输 数据信号； 在触控控制信号端的控制下， 触控侦测子模块控制驱动子模块向 触控信号读取端输出触控侦测信号， 触控侦测信号随着照射到光敏器件光强 的增大而减小， 实现触控侦测功能； 在发光控制信号端的控制下， 发光控制 子模块控制驱动子模块驱动发光器件发光， 实现显示驱动功能。 该像素电路 集成了触控与显示功能， 这样可以节省分别设置显示驱动电路和触控电路的 制作成本， 还可以减薄显示面板的厚度。
以上所述仅是本发明的示范性实施方式， 而非用于限制本发明的保护范 围， 本发明的保护范围由所附的权利要求确定。
本申请要求于 2013年 7月 31日递交的中国专利申请第 201310329847.X 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

权利要求书
1、 一种像素电路， 包括： 驱动子模块， 数据写入子模块， 具有光敏器件 的触控侦测子模块， 以及具有发光器件的发光控制子模块； 其中，
所述驱动子模块的第一端分别与所述数据写入子模块的第一端和所述触 控侦测子模块的第一端相连， 所述驱动子模块的第二端分别与所述数据写入 子模块的第二端、 所述触控侦测子模块的第二端和第一参考信号端相连， 所 述驱动子模块的第三端分别与所述数据写入子模块的第三端、 所述触控侦测 子模块的第三端和所述发光控制子模块的第一端相连；
所述数据写入子模块的第四端与复位信号端相连， 所述数据写入子模块 的第五端与扫描信号端相连， 所述数据写入子模块的第六端与数据信号端相 连； 在所述复位信号端、 所述扫描信号端和所述数据信号端的控制下， 所述 数据写入子模块向所述驱动子模块的第一端传输数据信号；
所述触控侦测子模块的第四端与触控控制信号端相连， 所述触控侦测子 模块的第五端与触控信号读取端相连； 在所述触控控制信号端的控制下， 所 述触控侦测子模块控制所述驱动子模块向所述触控信号读取端输出触控侦测 信号， 所述触控侦测信号随着照射到所述光敏器件光强的增大而减小；
所述发光控制子模块的第二端与第二参考信号端相连， 所述发光控制子 模块的第三端与发光控制信号端相连； 在所述发光控制信号端的控制下， 所 述发光控制子模块控制所述驱动子模块驱动所述发光器件发光。
2、如权利要求 1所述的像素电路， 其中， 所述驱动子模块的第一端和第 二端为信号输入端， 所述驱动子模块的第三端为信号输出端；
所述数据写入子模块的第一端为信号输出端， 所述数据写入子模块的第 二端、 第三端、 第四端、 第五端和第六端为信号输入端；
所述触控侦测子模块的第一端和第二端之一为信号输入端， 所述触控侦 测子模块的第一端和第二端的另一者为信号输出端； 所述触控侦测子模块的 第三端和第四端为信号输入端，所述触控侦测子模块的第五端为信号输出端； 所述发光控制子模块的第一端和第二端之一为信号输入端， 所述发光控 制子模块的第一端和第二端的另一者为信号输出端； 所述发光控制子模块的 第三端为信号输入端。
3、 如权利要求 2所述的像素电路， 其中， 所述驱动子模块包括： 驱动晶 体管， 所述驱动晶体管的栅极为所述驱动子模块的第一端， 所述驱动晶体管 的源极为所述驱动子模块的第二端， 所述驱动晶体管的漏极为所述驱动子模 块的第三端。
4、 如权利要求 3所述的像素电路， 其中， 所述驱动晶体管为 N型晶体 管， 所述第一参考信号端的电压为负电压或零电压， 所述第二参考信号端的 电压为正电压；
所述驱动晶体管为 P型晶体管， 所述第一参考信号端的电压为正电压， 所述第二参考信号端的电压为负电压或零电压。
5、如权利要求 1或 2所述的像素电路，其中，所述数据写入子模块包括： 第一开关晶体管、 第二开关晶体管、 第一电容和第二电容； 其中，
所述第一开关晶体管的栅极与所述复位信号端相连， 所述第一开关晶体 管的源极与所述驱动子模块的第三端相连， 所述第一开关晶体管的漏极分别 与所述驱动子模块的第一端、 所述第一电容的第一端和所述第二电容的第一 端相连；
所述第二开关晶体管的栅极与所述扫描信号端相连， 所述第二开关晶体 管的源极与所述数据信号端相连， 所述第二开关晶体管的漏极与所述第一电 容的第二端相连；
所述第二电容的第二端分别与所述第一参考信号端、 所述驱动子模块的 第二端相连和所述触控侦测子模块的第二端相连。
6、 如权利要求 5所述的像素电路， 其中， 所述第一开关晶体管为 N型 晶体管或 P型晶体管； 所述第二开关晶体管为 N型晶体管或 P型晶体管。
7、如权利要求 1或 2所述的像素电路，其中，所述触控侦测子模块包括： 第三开关晶体管和第四开关晶体管； 其中，
所述第三开关晶体管的栅极与所述触控控制信号端相连， 所述第三开关 晶体管的漏极与所述光敏器件的第一端相连；
所述第三开关晶体管的源极和所述光敏器件的第二端之一与所述驱动子 模块的第一端相连， 所述第三开关晶体管的源极和所述光敏器件的第二端的 另一者与所述第一参考信号端相连；
所述第四开关晶体管的栅极与所述触控控制信号端相连， 所述第四开关 晶体管的源极与所述驱动子模块的第三端相连， 所述第四开关晶体管的漏极 与所述触控信号读取端相连。
8、如权利要求 7所述像素电路， 其中， 所述第三开关晶体管和所述第四 开关晶体管为 N型晶体管； 或， 所述第三开关晶体管和所述第四开关晶体管 为 P型晶体管。
9、如权利要求 1或 2所述的像素电路，其中，所述发光控制子模块包括： 第五开关晶体管； 其中，
所述第五开关晶体管的栅极与所述发光控制信号端相连， 所述第五开关 晶体管的漏极与所述发光器件的第一端相连；
所述第五开关晶体管的源极和所述发光器件的第二端之一与所述驱动子 模块的第三端相连， 所述第五开关晶体管的源极和所述发光器件的第二端的 另一者与所述第二参考信号端相连。
10、 如权利要求 9所述的像素电路， 其中， 所述第五开关晶体管为 N型 晶体管或 P型晶体管。
11、 一种有机电致发光显示面板， 包括如权利要求 1-10任一项所述的像 素电路。
12、 一种显示装置， 包括如权利要求 11所述的有机电致发光显示面板。
PCT/CN2014/077616 2013-07-31 2014-05-15 像素电路、有机电致发光显示面板及显示装置 Ceased WO2015014147A1 (zh)

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