WO2019029282A1 - 像素电路及其驱动方法以及触控显示装置 - Google Patents

像素电路及其驱动方法以及触控显示装置 Download PDF

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Publication number
WO2019029282A1
WO2019029282A1 PCT/CN2018/092402 CN2018092402W WO2019029282A1 WO 2019029282 A1 WO2019029282 A1 WO 2019029282A1 CN 2018092402 W CN2018092402 W CN 2018092402W WO 2019029282 A1 WO2019029282 A1 WO 2019029282A1
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Prior art keywords
signal
transistor
coupled
control
driving
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PCT/CN2018/092402
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English (en)
French (fr)
Inventor
杨盛际
董学
陈小川
玄明花
于静
王迎姿
韩卫锋
王慧娟
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京东方科技集团股份有限公司
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Priority to US16/330,449 priority Critical patent/US11341906B2/en
Publication of WO2019029282A1 publication Critical patent/WO2019029282A1/zh

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    • 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]
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    • 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
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    • 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
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    • 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
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    • G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
    • G—PHYSICS
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    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G09G2360/147—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
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    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a pixel circuit and a driving method for driving the pixel circuit, and a touch display device.
  • AMOLED Active-matrix organic light emitting diode
  • Embodiments of the present disclosure provide a pixel circuit, a driving method thereof, and a touch display device.
  • a pixel circuit includes a pixel driving circuit, an optical sensing circuit, and a light emitting element.
  • the pixel driving circuit is configured to drive the light emitting element to emit light based on the first control signal from the first control line, the second control signal from the second control line, the scan signal from the scan line, and the data signal from the data line.
  • the optical sensing circuit is configured to sense the optical signal and convert the induced optical signal into an electrical signal, and output an electrical signal through the read line based on the first control signal, the second control signal, the scan signal, and the data signal.
  • the optical sensing circuit includes a photosensor and a signal control circuit.
  • the photosensor is configured to sense an optical signal and convert the induced optical signal into an electrical signal.
  • the signal control circuit is coupled to the photosensor and configured to output an electrical signal from the photosensor through the read line based on the first control signal, the second control signal, the scan signal, and the data signal.
  • the signal control circuit includes: a first capacitor, an inductive reset unit, an inductive write unit, and an inductive control unit.
  • the first capacitor is coupled to the photosensor, the inductive reset unit, the inductive write unit, and the inductive control unit.
  • the inductive reset unit is coupled to the first control line and a reset signal supply terminal that provides a reset signal, and is configured to reset the first capacitor and the photosensor based on the first control signal and the reset signal.
  • the inductive write unit is coupled to the scan line and the data line and configured to charge the data signal to the first capacitor through the photosensor based on the scan signal.
  • the charging current of the first capacitor is related to the optical signal sensed by the photosensor.
  • the sensing control unit is coupled to the second control line and the read line and configured to discharge the first capacitor to output an electrical signal from the read line based on the second control signal.
  • the photosensor includes a photo transistor.
  • the control electrode of the phototransistor is coupled to the first end of the first capacitor and the first end of the phototransistor, and the second end of the phototransistor is coupled to the second end of the first capacitor.
  • the inductive reset unit includes a first transistor.
  • the control electrode of the first transistor is coupled to the first control line, the first electrode of the first transistor is coupled to the reset signal supply terminal, and the second electrode of the first transistor is coupled to the first electrode and the control electrode of the phototransistor.
  • the inductive write unit includes a second transistor.
  • the control electrode of the second transistor is coupled to the scan line, the first electrode of the second transistor is coupled to the data line, and the second electrode of the second transistor is coupled to the first electrode and the control electrode of the photo transistor.
  • the sensing control unit includes a third transistor.
  • the control electrode of the third transistor is coupled to the second control line, the first electrode of the third transistor is coupled to the second end of the first capacitor, and the second electrode of the third transistor is coupled to the read line.
  • the pixel driving circuit includes: a first driving transistor, a second driving transistor, a second capacitor, a display reset unit, a display writing unit, and a display control unit.
  • the control electrode and the second electrode of the first driving transistor are coupled to the control electrode of the second driving transistor through the first node, and the first electrode of the first driving transistor is coupled to the display writing unit.
  • the first pole of the second driving transistor is coupled to the first voltage terminal that provides the first voltage, and the second pole of the second driving transistor is coupled to the display control unit.
  • the first end of the second capacitor is coupled to the first node, and the second end of the second capacitor is coupled to the first voltage terminal.
  • the display reset unit is coupled to the first control line, the second voltage terminal providing the second voltage, and the first node, and configured to reset the second capacitor based on the first control signal and the second voltage.
  • the display write unit is coupled to the scan line and the data line, and is configured to charge the data signal to the second capacitor through the display write unit and the first drive transistor based on the scan signal until the first drive transistor is turned off.
  • the display control unit is coupled to the second control line and the light emitting element, and is configured to generate a driving current to drive the light emitting element to emit light based on the second control signal and the second capacitor driving the second driving transistor.
  • the display reset unit includes a fourth transistor.
  • the control electrode of the fourth transistor is coupled to the first control line, the first pole of the fourth transistor is coupled to the second voltage terminal, and the second pole of the fourth transistor is coupled to the first node.
  • the display write unit includes a fifth transistor.
  • the control electrode of the fifth transistor is coupled to the scan line, the first electrode of the fifth transistor is coupled to the data line, and the second electrode of the fifth transistor is coupled to the first electrode of the first drive transistor.
  • the display control unit includes a sixth transistor.
  • the control electrode of the sixth transistor is coupled to the second control line, the first electrode of the sixth transistor is coupled to the second electrode of the second driving transistor, and the second electrode of the sixth transistor is coupled to the light emitting element.
  • a touch display device includes a plurality of pixel circuits according to the first aspect of the present disclosure, and a processing unit.
  • the processing unit is coupled to the read lines of the plurality of pixel circuits, respectively, and configured to determine whether a touch operation occurs based on the electrical signals from the plurality of read lines.
  • the processing unit is configured to calculate a change amount of the optical signal based on the electrical signal, and determine whether a touch operation occurs based on the amount of change of the optical signal and the preset threshold.
  • the processing unit is further configured to determine the touch position based on the read line and the second control line of the corresponding pixel circuit in the case where it is determined that the touch operation occurs.
  • a plurality of pixel circuits are disposed as sub-pixels spaced apart from each other.
  • a driving method of driving a pixel circuit according to the first aspect of the present disclosure.
  • the optical sensing circuit and the pixel driving circuit are reset based on the first control signal.
  • the optical signal induced by the optical sensing circuit is converted into an electrical signal, and a voltage for driving the light emitting element to emit light is stored in the pixel driving circuit.
  • an electrical signal is output from the optical sensing circuit based on the second control signal, and in the pixel driving circuit, the light emitting element is driven to emit light by a current corresponding to the stored voltage.
  • the optical sensing circuit includes a photosensor and a signal control circuit.
  • the signal control circuit includes a first capacitor, an inductive reset unit, an inductive write unit, and an inductive control unit.
  • the first capacitor is coupled to the photosensor, the inductive reset unit, the inductive write unit, and the inductive control unit.
  • the inductive reset unit is coupled to the first control line and the reset signal supply end.
  • the inductive write unit is coupled to the scan line and the data write line.
  • the sensing control unit is coupled to the second control line and the readout line. In the driving method, a reset signal is supplied to the inductive reset unit and the photosensor based on the first control signal to reset the first capacitor and the photosensor.
  • a data signal is provided to the inductive write unit and the photosensor to provide a data signal to the first capacitor.
  • the first capacitor is discharged via the sensing control unit to output an electrical signal via the read line.
  • the pixel driving circuit includes: a first driving transistor, a second driving transistor, a second capacitor, a display reset unit, a display writing unit, and a display control unit.
  • the control electrode and the second electrode of the first driving transistor are coupled to the control electrode through the first node and the second driving transistor, and the first electrode of the first driving transistor is coupled to the display writing unit.
  • the first pole of the second driving transistor is coupled to the first voltage terminal that provides the first power voltage, and the second pole of the second driving transistor is coupled to the display control unit.
  • the first end of the second capacitor is coupled to the first node, and the second end of the second capacitor is coupled to the first voltage end.
  • the display reset unit is coupled to the first control line and the second voltage terminal.
  • the display write unit is coupled to the scan line and the data line.
  • the display control unit is coupled to the second control line and the light emitting element.
  • the second voltage is supplied to the display reset unit based on the first control signal to reset the second capacitor.
  • a data signal is supplied to the display write unit and the first drive transistor to charge the second capacitor to the first drive transistor.
  • the second driving transistor is driven to generate a driving current, and a driving current is supplied to the light emitting element via the display control unit.
  • FIG. 1 is a schematic block diagram of a pixel circuit in accordance with an embodiment of the present disclosure
  • FIG. 2 is an example circuit diagram of a pixel circuit in accordance with an embodiment of the present disclosure
  • Figure 3 is a timing diagram of signals for the pixel circuit shown in Figure 2;
  • FIG. 4 is an exemplary equivalent circuit diagram of a pixel circuit in a first stage, in accordance with an embodiment of the present disclosure
  • FIG. 5 is an exemplary equivalent circuit diagram of a pixel circuit in a second stage, in accordance with an embodiment of the present disclosure
  • FIG. 6 is an exemplary equivalent circuit diagram of a pixel circuit in a third stage, in accordance with an embodiment of the present disclosure
  • FIG. 7 is a schematic flowchart of a driving method of driving the pixel circuit shown in FIG. 1 according to an embodiment of the present disclosure
  • FIG. 8 is a schematic block diagram of a touch display device according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram of an arrangement of pixel circuits in a touch display device according to an embodiment of the present disclosure.
  • the source and drain (emitter and collector) of the transistor are symmetrical, and the source and drain (emitter and collector) of the N-type transistor and the P-type transistor
  • the conduction currents are opposite in direction, so in the embodiments of the present disclosure, the controlled intermediate end of the transistor is referred to as the control pole, the signal input terminal is referred to as the first pole, and the signal output terminal is referred to as the second pole.
  • the transistors employed in the embodiments of the present disclosure are primarily switching transistors.
  • terms such as "first" and "second” are used to distinguish one component (or a portion of the component) from another component (or another portion of the component).
  • the design of the pixel circuit is critical to the AMOLED organic light emitting display, and the organic light emitting diode OLED in the AMOLED is current driven, requiring a stable current to control the light.
  • the threshold voltage of the driving transistor of each pixel has unevenness due to process processes and device aging. This causes the current flowing through the OLED in each pixel to change, thereby affecting the display of the entire screen.
  • the light touch is not limited by the size of the module itself, except for the same touch sensitivity.
  • a pixel circuit having an optical sensing function and a touch display device having the same according to an embodiment of the present disclosure will be described below with reference to the accompanying drawings.
  • FIG. 1 is a schematic block diagram of a pixel circuit 100 in accordance with an embodiment of the present disclosure.
  • the pixel circuit 100 may include a pixel driving circuit 10, an optical sensing circuit 20, and a light emitting element 30 (for example, an organic light emitting diode).
  • the pixel driving circuit 10 is coupled to the first control line Em1, the second control line Em2, the scan line Scan1, the data line Data, the optical sensing circuit 20, and the light emitting element 30, and is configured to be based on the first control from the first control line Em1.
  • the signal, the second control signal from the second control line Em2, the scan signal from the scan line Scan1, and the data signal from the data line Data drive the light-emitting element 30 to emit light.
  • the optical sensing circuit 20 is coupled to the first control line Em1, the second control line Em2, the scan line Scan1, the data line Data, the read line RL, and the pixel driving circuit 10, and is configured to sense the optical signal and the induced light The signal is converted into an electrical signal, and an electrical signal is output through the read line RL based on the first control signal, the second control signal, the scan signal, and the data signal.
  • the pixel circuit 100 is capable of achieving integration of optical sensing and pixel driving.
  • the pixel driving circuit 10 and the optical sensing circuit 20 share the first control line Em1, the second control line Em2, the scan line Scan1, and the data line Data, which realizes efficient integration of optical sensing and pixel driving, thereby saving layout of the pixel circuit. space.
  • FIG. 2 shows an example circuit diagram of a pixel circuit 200 in accordance with an embodiment of the present disclosure.
  • the optical sensing circuit 20 may include a photosensor 201 and a signal control circuit (a portion of the optical sensing circuit 20 other than the photosensor 201).
  • the photosensor 201 is configured to sense an optical signal and convert the induced optical signal into an electrical signal.
  • the signal control circuit is coupled to the photosensor 201 and configured to output an electrical signal from the photosensor 201 through the read line RL based on the first control signal, the second control signal, the scan signal, and the data signal.
  • the signal control circuit may include a first capacitor C1, an inductive reset unit 202, an inductive write unit 203, and an inductive control unit 204.
  • the first capacitor C1 is coupled to the photosensor 201, the inductive reset unit 202, the inductive write unit 203, and the inductive control unit 204.
  • the inductive reset unit 202 is coupled to the first control line Em1 and the reset signal providing terminal Vcom that provides the reset signal, and is configured to be provided based on the first control signal and the reset signal providing terminal Vcom provided by the first control line Em1.
  • the reset signal resets the first capacitor C1 and the photosensor 201.
  • the inductive writing unit 203 is coupled to the scan line Scan1 and the data line Data, and is configured to cause the data signal supplied from the data line Data to be charged to the first capacitor C1 through the photosensor 201 based on the scan signal supplied from the scan line Scan1.
  • the charging current of the first capacitor C1 is related to the optical signal sensed by the photosensor 201.
  • the sensing control unit 204 is coupled to the second control line Em2 and the read line RL, and is configured to discharge the first capacitor C1 to output an electrical signal from the read line RL based on the second control signal provided by the second control line Em2. .
  • the photosensor 201 may include a photosensitive transistor N1.
  • the control electrode of the phototransistor N1 is coupled to the first end of the first capacitor C1 and the first end of the phototransistor N1, and the second end of the photo transistor N1 is coupled to the second end of the first capacitor C1.
  • the inductive reset unit 202 can include a first transistor T1.
  • the control electrode of the first transistor T1 is coupled to the first control line Em1, the first electrode of the first transistor T1 is coupled to the reset signal supply terminal Vcom that provides the reset signal, and the second electrode of the first transistor T1 and the phototransistor
  • the first pole of N1 is coupled to the control pole.
  • the inductive writing unit 203 may include a second transistor T2.
  • the control electrode of the second transistor T2 is coupled to the scan line Scan1, the first electrode of the second transistor T2 is coupled to the data line Data, and the second electrode of the second transistor T2 is coupled to the first electrode and the control electrode of the photo transistor N1.
  • the sensing control unit 204 can include a third transistor T3.
  • the control electrode of the third transistor T3 is coupled to the second control line Em2, the first electrode of the third transistor T3 is coupled to the second end of the first capacitor C1, and the second electrode of the third transistor T3 is coupled to the read line RL. Pick up.
  • the optical touch module 20 may include a photo transistor N1, a first transistor T1, a second transistor T2, a third transistor T3, and a first capacitor C1.
  • the phototransistor N1 is a Thin Film Transistor (TFT).
  • the first transistor T1, the second transistor T2, and the third transistor T3 are switching TFTs.
  • the photoreceptor N1 generates a photocurrent (ie, an electrical signal) when light is incident on the photoreceptor N1, and the phototransistor N1 generates photocurrents of different intensities when different light intensities are sensed.
  • the first transistor T1, the second transistor T2, and the third transistor T3 function as a switch that controls the photosensitive TFT.
  • the first capacitor C1 is used to store the photocurrent generated by the photosensitive TFT.
  • the third transistor T3 also functions to control the reading of electrical signals. When the third transistor T3 is turned on, the photocurrent stored by the first capacitor C1 can be output through the read line RL.
  • the pixel driving circuit 10 may include a first driving transistor M1, a second driving transistor M2, a second capacitor C2, a display reset unit 101, a display writing unit 102, and a display control unit 103.
  • the control electrode and the second electrode of the first driving transistor M1 are coupled to the control electrode of the second driving transistor M2 through the first node a, and the first electrode of the first driving transistor M1 is coupled to the display writing unit 102.
  • the first electrode of the second driving transistor M2 is coupled to the first voltage terminal V1 that supplies the first voltage, and the second electrode of the second driving transistor M2 is coupled to the display control unit 103.
  • the first end of the second capacitor C2 is coupled to the first node a, and the second end of the second capacitor C2 is coupled to the first voltage terminal V1 that supplies the first voltage.
  • the display reset unit 101 is coupled to the first control line Em1, the second voltage terminal Vint that supplies the second voltage, and the first node a, and is configured to provide the first control signal and the second voltage based on the first control line Em1. , resetting the second capacitor C2.
  • the display write unit 102 is coupled to the scan line Scan1 and the data line Data, and is configured to pass the data signal provided by the data line Data through the display write unit 102 and the first drive transistor M1 based on the scan signal provided by the scan line Scan1.
  • the second capacitor C2 is charged until the first driving transistor M1 is turned off.
  • the display control unit 103 is coupled to the second control line Em2 and the light emitting element 30, and is configured to generate a driving current to drive the light by driving the second driving transistor M2 based on the second control signal provided by the second control line Em2 and the second capacitor C2.
  • Element 30 eg, an organic light emitting diode OLED emits light.
  • the display reset unit 101 may include a fourth transistor T4.
  • the control electrode of the fourth transistor T4 is coupled to the first control line Em1, the first electrode of the fourth transistor T4 is coupled to the second voltage terminal Vint that provides the second voltage, and the second electrode of the fourth transistor T4 is coupled to the first node. a coupling.
  • the display write unit 102 may include a fifth transistor T5.
  • the control electrode of the fifth transistor T5 is coupled to the scan line Scan1
  • the first electrode of the fifth transistor T5 is coupled to the data line Data
  • the second electrode of the fifth transistor T5 is coupled to the first electrode of the first driving transistor M1.
  • the display control unit 103 may include a sixth transistor T6.
  • the control electrode of the sixth transistor T6 is coupled to the second control line Em2, the first electrode of the sixth transistor T6 is coupled to the second electrode of the second driving transistor M2, and the second electrode of the sixth transistor T6 is coupled to the light emitting element 30 (for example, the organic light emitting diode OLED) is coupled.
  • the light emitting element 30 For example, the organic light emitting diode OLED
  • the pixel driving circuit 10 may include a first driving transistor M1, a second driving transistor M2, a second capacitor C2, a fourth transistor T4, a fifth transistor T5, and a sixth transistor T6.
  • the first driving transistor M1 and the second driving transistor M2 are driving TFTs.
  • the fourth transistor T4, the fifth transistor T5, and the sixth transistor T6 are switching TFTs.
  • the pixel driving circuit 10 drives the second driving transistor M2 to generate a driving current by controlling the fourth transistor T4, the fifth transistor T5, and the sixth transistor T6 to drive the light emitting element 30 to emit light.
  • the transistor T6 can be a "P" type TFT.
  • the layout of the pixels in the pixel driving circuit 10 and the optical sensing circuit 20 using the "P" type TFT is advantageous for the process.
  • the pixel driving circuit 10 may output an electrical signal to the organic light emitting diode 30 based on the first control signal, the second control signal, the scan signal, and the data signal.
  • the organic light emitting diode 30 generates radiation light by a combination of electrons and holes (positively charged ions). Thus, the organic light emitting diode 30 can directly convert electricity into light.
  • the pixel driving circuit 10 controls the organic light emitting diode 30 to emit light by a stable current.
  • the pixel circuit 100 can adopt a Low Temperature Poly-silicon (LTPS) process, so that the design of the plurality of thin film transistor plus capacitors does not affect the aperture ratio of the module.
  • LTPS Low Temperature Poly-silicon
  • FIG. 3 shows a timing chart for each signal of the pixel circuit 200 shown in FIG. 2.
  • all transistors are P-type transistors.
  • the first voltage is a high voltage and the second voltage is a low voltage.
  • the first control signal VEm1 is a low voltage.
  • the second control signal VEm2, the data signal Vdata, and the scan signal VScan1 are high voltages.
  • 4 illustrates an exemplary equivalent circuit diagram of pixel circuit 200 in a first stage I, in which a diagonal line on the transistor indicates that the transistor is turned off, in accordance with an embodiment of the present disclosure.
  • the first control signal VEm1 is at a low voltage
  • the first transistor T1 is turned on. Since the scan signal VScan1 is at a high voltage, the second transistor T2 is turned off. Since the second control signal VEm2 is at a high voltage, the third transistor T3 is turned off. Therefore, the reset signal from the reset signal supply terminal Vcom resets the photo transistor N1 through the first transistor T1.
  • the photo transistor N1 is turned on, thereby causing the first capacitor C1 to be reset.
  • the reset signal supply terminal Vcom can be the ground terminal. Therefore, the photo transistor N1 and the first capacitor C1 are grounded through the first transistor T1. At this time, the control terminal of the photo transistor N1 is grounded, so the photo transistor N1 is turned on.
  • the fourth transistor T4 Since the first control signal VEm1 is at a low voltage, the fourth transistor T4 is turned on. Therefore, the second voltage of the second voltage terminal Vint is reset by the fourth transistor T4 to the second capacitor C2 (as indicated by the arrow in FIG. 4) to apply the voltage of the first terminal of the second capacitor C2 (ie, The voltage of the first node a) is reset to the second voltage.
  • the first driving transistor M1 and the second driving transistor M2 are turned on. Since the scan signal VScan1 is at a high voltage, the fifth transistor T5 is turned off. Since the second control signal VEm2 is at a high voltage, the sixth crystal T6 is turned off.
  • FIG. 5 illustrates an exemplary equivalent circuit diagram of pixel circuit 200 in a second stage II, in which a diagonal line on the transistor indicates that the transistor is turned off, in accordance with an embodiment of the present disclosure.
  • the first control signal VEm1 Since the first control signal VEm1 is at a high voltage, the first transistor T1 is turned off. Therefore, the reset signal from the reset signal supply terminal does not affect the photo transistor N1 and the first capacitor C1. Since the scan signal VScan1 is at a low voltage, the second transistor T2 is turned on. Since the second control signal VEm2 is at a high voltage, the third transistor T3 is turned off. Under the holding action of the first capacitor C1, the gate of the photo transistor N1 is kept at a low level, and thus the photo transistor N1 continues to be turned on. Therefore, the data signal Vdata supplied from the data line Data is charged to the first capacitor C1 through the photo transistor N1.
  • the photoreceptor transistor N1 When light is irradiated to the photoreceptor transistor N1, the intensity of the light signal sensed by the photo transistor N1 increases.
  • the photo transistor N1 converts the sensed optical signal into an electrical signal, and therefore, the charging current of the first capacitor C1 increases.
  • the electric signal stored in the first capacitor C1 is a fixed value for the phototransistor N1 that normally receives light.
  • the fourth transistor T4 Since the first control signal VEm1 is at a high voltage, the fourth transistor T4 is turned off. Therefore, the voltage of the first node a is not affected by the second voltage from the second voltage terminal Vint. Due to the holding action of the second capacitor C2, the first node a maintains the low voltage of the previous stage. Therefore, the first driving transistor M1 and the second driving transistor M2 continue to be turned on. Since the scan signal VScan1 is at a low voltage, the fifth transistor T5 is turned on. Therefore, the data signal Vdata supplied from the data line charges the second capacitor C2 through the fifth transistor T5 and the first driving transistor M1 until the voltage of the first node a reaches Vdata+Vth1.
  • Vth1 is the threshold voltage of the first driving transistor M1. Since the second control signal VEm2 is at a low voltage, the sixth transistor T6 is turned off.
  • FIG. 6 illustrates an exemplary equivalent circuit diagram of pixel circuit 200 in a third stage III, in which a diagonal line on the transistor indicates that the transistor is turned off, in accordance with an embodiment of the present disclosure.
  • the first control signal VEm1 Since the first control signal VEm1 is at a high voltage, the first transistor T1 is turned off. Therefore, the reset signal from the reset signal supply terminal does not affect the photo transistor N1 and the first capacitor C1. Since the scan signal VScan1 is at a high voltage, the second transistor T2 is turned off. Therefore, the data signal Vdata cannot continue to charge the first capacitor C1 through the second transistor T2. Since the second control signal VEm2 is at a low voltage, the third transistor T3 is turned on. Therefore, the first capacitor C1 is discharged through the third transistor T3 to output its stored electrical signal through the read line RL.
  • the fourth transistor T4 Since the first control signal VEm1 is at a high voltage, the fourth transistor T4 is turned off. Therefore, the voltage of the first node a is not affected by the second voltage from the second voltage terminal Vint. Since the scan signal VScan1 is at a high voltage, the fifth transistor T5 is turned off. Therefore, the voltage of the first node a is not affected by the data signal Vdata from the data signal terminal Data. Since the second control signal VEm2 is a low voltage, the sixth transistor T6 is turned on. Therefore, the second driving transistor M2 generates a driving current and supplies the driving current to the light emitting element 30 (for example, the organic light emitting diode OLED) through the sixth transistor T6.
  • the light emitting element 30 for example, the organic light emitting diode OLED
  • the current I OLED flowing through the organic light emitting diode OLED can be obtained as:
  • I OLED K(V GS –Vth2) 2
  • V GS is the gate-to-source voltage difference of the second driving transistor M2, that is, the difference between the voltage of the first node a and the first voltage V1 provided by the first voltage terminal V1.
  • Vth1 is the threshold voltage of the first driving transistor M1.
  • the transistors in shift register unit 100 as shown in Figures 2 and 4-6 may also be N-type transistors.
  • the first voltage terminal V1 outputs a low voltage
  • the second voltage terminal Vint outputs a high voltage
  • the reset signal supply terminal outputs a high voltage.
  • the voltages of the various signals at various stages are opposite to the voltages of the various signals shown in Figure 3 at various stages.
  • a partial transistor may be an N-type transistor, and a part of the transistor is a P-type transistor. Any variations and modifications based on the embodiments of the present disclosure should fall within the protection scope of the present disclosure.
  • FIG. 7 illustrates a schematic flow chart of a driving method of driving the pixel circuit 100 shown in FIG. 1 according to an embodiment of the present disclosure.
  • step S10 the optical sensing circuit 20 and the pixel driving circuit 10 are reset based on the first control signal Em1.
  • a reset signal is supplied to the inductive reset unit 202 and the photosensor 201 based on the first control signal Em1 to reset the first capacitor C1 and Photoelectric sensor 201.
  • a second voltage is supplied to the display reset unit 101 based on the first control signal Em1 to reset the second capacitor C2.
  • step S11 the optical signal induced by the optical sensing circuit 20 is converted into an electrical signal based on the first control signal Em1, the scanning signal Vscan, and the data signal Vdata, and the voltage for driving the light-emitting element 30 to emit light is stored in the pixel driving circuit 10. .
  • the data signal Vdata is supplied to the inductive writing unit 203 and the photosensor 201 based on the first control signal Em1 and the scan signal Vscan to be first Capacitor C1 provides a data signal Vdata.
  • the data signal Vdata is supplied to the display write unit 102 and the first drive transistor M1 to charge the second capacitor C2 to the first drive transistor M1.
  • step S12 an electrical signal is output from the optical sensing circuit 20 based on the second control signal Em2, and in the pixel driving circuit 10, the light-emitting element 30 is driven to emit light by a current corresponding to the stored voltage.
  • the first capacitor C1 is discharged via the sensing control unit 204 based on the second control signal Em2 to output an electrical signal via the read line RL.
  • the second driving transistor M2 is driven to generate a driving current based on the second control signal Em2 and the second capacitor C2, and supplies a driving current to the light emitting element 30 via the display control unit 103.
  • FIG. 8 is a schematic block diagram of a touch display device 800 in accordance with an embodiment of the present disclosure.
  • the touch display device includes a plurality of pixel circuits 100 as shown in FIG. 1 and a processing unit 810.
  • a light emitting unit (not shown) may be provided corresponding to the photosensor 201.
  • the light emitting unit can emit light at a preset frequency.
  • the touch operation is performed, the light emitted by the light emitting unit can be reflected to the photosensor 201.
  • the photosensor 201 generates an electrical signal based on the sensed reflected light.
  • the processing unit 810 is coupled to the read lines RL of the plurality of pixel circuits 100, respectively, and is configured to determine whether a touch operation occurs based on electrical signals from the plurality of read lines RL.
  • the optical sensing circuit 20 senses light through the photosensor 201.
  • the optical signal sensed by the photosensor 201 changes, causing the electrical signal of the output thereof to change. Therefore, the processing unit 810 can determine whether a touch operation occurs according to the difference between the change of the electrical signals before and after the touch and the preset threshold.
  • the processing unit 810 can be configured to calculate a change amount of the optical signal based on the electrical signal, and determine whether a touch operation occurs based on the amount of change in the optical signal and the preset threshold.
  • the processing unit can include an amplifier and a processor.
  • the electrical signal can be transmitted to the amplifier through the read line RL.
  • the amplifier amplifies the electrical signal and transmits the amplified signal to the processor.
  • the processor performs data analysis on the amplified signal to determine whether the amount of change in the optical signal exceeds a preset threshold to determine whether a touch operation occurs.
  • the processor may determine the amount of change of the optical signal according to the change of the electrical signal before and after the touch, compare the change amount of the optical signal with a preset threshold when the touchless operation is not performed, and determine whether there is a touch according to the comparison result.
  • Control operation light signal change. For example, if the amount of change in the optical signal is greater than a preset threshold, it is determined that a touch operation occurs.
  • a plurality of pixel circuits 100 having optical sensing functions correspond to a plurality of sub-pixels, and each pixel circuit 100 having an optical sensing function is used to drive the light-emitting elements 30 of the corresponding sub-pixels to emit light, and to touch on the corresponding pixels.
  • the processing unit 810 is further configured to determine the touch position based on the read line RL and the second control line Em2 of the corresponding pixel circuit 100 in the case where it is determined that the touch operation occurs.
  • the X-direction coordinate of the touch position is determined by the second control line Em2
  • the Y-direction coordinate of the touch position is determined by the read line RL.
  • a display device using an organic light emitting diode may not require liquid crystal as a medium for gray scale display. Therefore, the light touch does not affect the display problem.
  • FIG. 9 illustrates a schematic diagram of an arrangement of pixel circuits 100 in touch display device 800, in accordance with an embodiment of the present disclosure.
  • the pixel circuits 100 are disposed as sub-pixels spaced apart from each other.
  • each of the three sub-pixels is a group to constitute one pixel unit 90, and each pixel unit 90 may include two conventional pixel circuits 91 and one pixel circuit according to an embodiment of the present disclosure.
  • the conventional pixel circuit 91 can only implement the display function without implementing the optical sensing function.
  • the pixel circuit 100 according to an embodiment of the present disclosure is capable of achieving functional integration of optical sensing and display.
  • a pixel circuit according to an embodiment of the present disclosure may be set to sub-pixels spaced apart from each other at other resolutions.
  • the embodiments of the present disclosure do not limit this.
  • the touch display device can be an AMOLED touch display.
  • the touch display device can be applied to any product having a display function, such as an electronic paper, a mobile phone, a tablet, a television, a notebook computer, a digital photo frame, a navigator, or the like.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining “first” and “second” may include at least one of the features, either explicitly or implicitly.
  • the terms “mounted,” “coupled,” “coupled,” and “fixed” are used in a broad sense, and may be, for example, fixedly coupled, or Removably coupled, or integrated; can be mechanically coupled or electrically coupled; can be directly coupled, or indirectly coupled through an intermediate medium, can be internal communication of two components or two components Interactions, unless otherwise expressly defined.
  • the specific meanings of the above terms in the present disclosure can be understood by those skilled in the art on a case-by-case basis.
  • the first feature "on” or “under” the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.
  • Any process or method description in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logic function or process.
  • the scope of the preferred embodiments of the present disclosure includes additional implementations, in which the functions may be performed in a substantially simultaneous manner or in an inverse order depending on the functions involved, in the order shown or discussed. It will be understood by those skilled in the art to which the embodiments of the present disclosure pertain.
  • a "computer-readable medium” can be any apparatus that can contain, store, communicate, propagate, or transport a program for use in an instruction execution system, apparatus, or device, or in conjunction with the instruction execution system, apparatus, or device.
  • computer readable media include the following: electrical couplings (electronic devices) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM) , read only memory (ROM), erasable editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM).
  • the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method is processed to obtain the program electronically and then stored in computer memory.
  • portions of the present disclosure can be implemented in hardware, software, firmware, or a combination thereof.
  • multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system.
  • a suitable instruction execution system For example, if implemented in hardware and in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: discrete with logic gates for implementing logic functions on data signals Logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), and the like.
  • each functional unit in various embodiments of the present disclosure may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.
  • the above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like. While the embodiments of the present disclosure have been shown and described above, it is understood that the foregoing embodiments are illustrative and are not to be construed as limiting the scope of the disclosure The embodiments are subject to variations, modifications, substitutions and variations.

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Abstract

一种像素电路(100,200)及其驱动方法以及触控显示装置(800)。像素电路(100,200)包括：像素驱动电路(10)、光学感应电路(20)和发光元件(30)。像素驱动电路(10)被配置为基于来自第一控制线(Em1)的第一控制信号(VEm1)、来自第二控制线(Em2)的第二控制信号(VEm2)、来自扫描线(Scan1)的扫描信号(VScan1)和来自数据线(Data)的数据信号(Vdata)，驱动发光元件(30)发光。光学感应电路(20)被配置为感应光信号，并将感应的光信号转换为电信号，以及基于第一控制信号(VEm1)、第二控制信号(VEm2)、扫描信号(VScan1)和数据信号(Vdata)，通过读取线(RL)输出电信号。

Description

像素电路及其驱动方法以及触控显示装置
相关申请的交叉引用
本申请要求于2017年8月8日递交的中国专利申请第201710669444.8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。
技术领域
本公开涉及显示技术领域，特别涉及一种像素电路及驱动该像素电路的驱动方法，以及触控显示装置。
背景技术
有源矩阵有机发光二极管(Active-matrix organic light Emitting diode，简称AMOLED)显示器已广泛应用于手机、PDA、数码相机等显示领域，其具有低能耗、生产成本低、自发光、宽视角及响应速度快等优点。
发明内容
本公开的实施例提出一种像素电路及其驱动方法以及触控显示装置。
根据本公开的第一方面，提供了一种像素电路。该像素电路包括：像素驱动电路、光学感应电路和发光元件。像素驱动电路被配置为基于来自第一控制线的第一控制信号、来自第二控制线的第二控制信号、来自扫描线的扫描信号和来自数据线的数据信号，驱动发光元件发光。光学感应电路被配置为感应光信号，并将所感应的光信号转换为电信号，以及基于第一控制信号、第二控制信号、扫描信号和数据信号，通过读取线输出电信号。
在本公开的实施例中，光学感应电路包括光电传感器和信号控制电路。光电传感器被配置为感应光信号，并将所感应的光信号转换为电信号。信号控制电路与光电传感器耦接，并被配置为基于第一控制信号、第二控制 信号、扫描信号和数据信号，将来自光电传感器的电信号通过读取线输出。
在本公开的实施例中，信号控制电路包括：第一电容器，感应重置单元，感应写入单元和感应控制单元。第一电容器与光电传感器、感应重置单元、感应写入单元和感应控制单元耦接。感应重置单元与第一控制线和提供重置信号的重置信号提供端耦接，并被配置为基于第一控制信号和重置信号，对第一电容器和光电传感器进行重置。感应写入单元与扫描线和数据线耦接，并被配置为基于扫描信号，使数据信号通过光电传感器向第一电容器充电。第一电容器的充电电流与光电传感器所感应到的光信号相关。感应控制单元与第二控制线和读取线耦接，并被配置为基于第二控制信号，使第一电容器放电以从读取线输出电信号。
在本公开的实施例中，光电传感器包括感光晶体管。感光晶体管的控制极与第一电容器的第一端和感光晶体管的第一极耦接，感光晶体管的第二极与第一电容器的第二端耦接。
在本公开的实施例中，感应重置单元包括第一晶体管。第一晶体管的控制极与第一控制线耦接，第一晶体管的第一极与重置信号提供端耦接，第一晶体管的第二极与感光晶体管的第一极和控制极耦接。
在本公开的实施例中，感应写入单元包括第二晶体管。第二晶体管的控制极与扫描线耦接，第二晶体管的第一极与数据线耦接，第二晶体管的第二极与感光晶体管的第一极和控制极耦接。
在本公开的实施例中，感应控制单元包括第三晶体管。第三晶体管的控制极与第二控制线耦接，第三晶体管的第一极与第一电容器的第二端耦接，第三晶体管的第二极与读取线耦接。
在本公开的实施例中，像素驱动电路包括：第一驱动晶体管，第二驱动晶体管，第二电容器，显示重置单元，显示写入单元和显示控制单元。第一驱动晶体管的控制极和第二极通过第一节点与第二驱动晶体管的控制极耦接，第一驱动晶体管的第一极与显示写入单元耦接。第二驱动晶体管的第一极与提供第一电压的第一电压端耦接，第二驱动晶体管的第二极与显示控制单元耦接。第二电容器的第一端与第一节点耦接，第二电容器的 第二端与第一电压端耦接。显示重置单元与第一控制线、提供第二电压的第二电压端和第一节点耦接，并被配置为基于第一控制信号和第二电压，对第二电容器进行重置。显示写入单元与扫描线和数据线耦接，并被配置为基于扫描信号，使数据信号通过显示写入单元和第一驱动晶体管对第二电容器充电直至第一驱动晶体管截止。显示控制单元与第二控制线和发光元件耦接，并被配置为基于第二控制信号和第二电容器驱动第二驱动晶体管生成驱动电流以驱动发光元件发光。
在本公开的实施例中，显示重置单元包括第四晶体管。第四晶体管的控制极与第一控制线耦接，第四晶体管的第一极与第二电压端耦接，第四晶体管的第二极与第一节点耦接。
在本公开的实施例中，显示写入单元包括第五晶体管。第五晶体管的控制极与扫描线耦接，第五晶体管的第一极与数据线耦接，第五晶体管的第二极与第一驱动晶体管的第一极耦接。
在本公开的实施例中，显示控制单元包括第六晶体管。第六晶体管的控制极与第二控制线耦接，第六晶体管的第一极与第二驱动晶体管的第二极耦接，第六晶体管的第二极与发光元件耦接。
根据本公开的第二方面，提供了一种触控显示装置。该触控显示装置包括：多个根据本公开的第一方面的像素电路，以及处理单元。该处理单元与该多个像素电路的读取线分别耦接，并被配置为基于来自多条读取线的电信号，确定是否发生触控操作。
在本公开的实施例中，处理单元被配置为基于电信号计算光信号的变化量，并基于光信号的变化量和预设阈值来确定是否发生触控操作。
在本公开的实施例中，处理单元进一步被配置为在确定发生触控操作的情况下，基于相应的像素电路的读取线和第二控制线确定触控位置。
在本公开的实施例中，多个像素电路被设置成彼此间隔的子像素。
根据本公开的第三方面，提供了一种驱动根据本公开的第一方面的像素电路的驱动方法。在该驱动方法中，基于第一控制信号，重置光学感应电路和像素驱动电路。然后，基于第一控制信号、扫描信号和数据信号， 将光学感应电路所感应的光信号转换为电信号，在像素驱动电路中存储用于驱动发光元件发光的电压。接着，基于第二控制信号，从光学感应电路输出电信号，以及在像素驱动电路中，通过所存储的电压对应的电流来驱动发光元件发光。
在本公开的实施例中，光学感应电路包括光电传感器和信号控制电路。信号控制电路包括第一电容器，感应重置单元，感应写入单元和感应控制单元。第一电容器与光电传感器、感应重置单元、感应写入单元和感应控制单元耦接。感应重置单元与第一控制线和重置信号提供端耦接。感应写入单元与扫描线和数据写入线耦接。感应控制单元与第二控制线和读出线耦接。在驱动方法中，基于第一控制信号，向感应重置单元和光电传感器提供重置信号，以重置第一电容器和光电传感器。然后，基于第一控制信号和扫描信号，向感应写入单元和光电传感器提供数据信号，以向第一电容器提供数据信号。接着，基于第二控制信号，使第一电容器经由感应控制单元进行放电，以经由读取线输出电信号。
在本公开的进一步的实施例中，像素驱动电路包括：第一驱动晶体管，第二驱动晶体管，第二电容器，显示重置单元，显示写入单元和显示控制单元。第一驱动晶体管的控制极和第二极通过第一节点和第二驱动晶体管控制极耦接，第一驱动晶体管的第一极与显示写入单元耦接。第二驱动晶体管的第一极与提供第一电源电压的第一电压端耦接，第二驱动晶体管的第二极与显示控制单元耦接。第二电容器的第一端与第一节点耦接，第二电容器的第二端与第一电压端耦接。显示重置单元与第一控制线和第二电压端耦接。显示写入单元与扫描线和数据线耦接。显示控制单元与第二控制线和发光元件耦接。在该驱动方法中，进一步地，基于第一控制信号，向显示重置单元提供第二电压，以重置第二电容器。然后，基于扫描信号，向显示写入单元和第一驱动晶体管提供数据信号，以使第二电容器充电至第一驱动晶体管截止。接着，基于第二控制信号和第二电容器，驱动第二驱动晶体管生成驱动电流，并经由显示控制单元向发光元件提供驱动电流。
附图说明
图1是根据本公开的实施例的像素电路的示意性框图；
图2是根据本公开的实施例的像素电路的示例电路图；
图3是用于图2所示的像素电路的各信号的时序图；
图4是根据本公开的实施例的像素电路在第一阶段的示例性等效电路图；
图5是根据本公开的实施例的像素电路在第二阶段的示例性等效电路图；
图6是根据本公开的实施例的像素电路在第三阶段的示例性等效电路图；
图7是根据本公开的实施例的驱动如图1所示的像素电路的驱动方法的示意性流程图；
图8是根据本公开的实施例的触控显示装置的示意性框图；以及
图9是根据本公开的实施例的触控显示装置中的像素电路的布置的示意图。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本公开，而不能理解为对本公开的限制。
为了使本公开的实施例的目的、技术方案和优点更加清楚，下面将结合附图，对本公开的实施例的技术方案进行清楚、完整的描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域技术人员在无需创造性劳动的前提下所获得的所有其它实施例，也都属于本公开保护的范围。
除非另外定义，否则在此使用的所有术语(包括技术和科学术语)具有与本公开主题所属领域的技术人员所通常理解的相同含义。进一步将理 解的是，诸如在通常使用的词典中定义的那些的术语应解释为具有与说明书上下文和相关技术中它们的含义一致的含义，并且将不以理想化或过于正式的形式来解释，除非在此另外明确定义。如在此所使用的，将两个或更多部分“连接”或“耦接”到一起的陈述应指这些部分直接结合到一起或通过一个或多个中间部件结合。
在本公开的所有实施例中，由于晶体管的源极和漏极(发射极和集电极)是对称的，并且N型晶体管和P型晶体管的源极和漏极(发射极和集电极)之间的导通电流方向相反，因此在本公开的实施例中，统一将晶体管的受控中间端称为控制极，信号输入端称为第一极，信号输出端称为第二极。本公开的实施例中所采用的晶体管主要是开关晶体管。另外，诸如“第一”和“第二”的术语仅用于将一个部件(或部件的一部分)与另一个部件(或部件的另一部分)区分开。
像素电路的设计对AMOLED有机发光显示器是关键的，而AMOLED中的有机发光二极管OLED属于电流驱动，需要稳定的电流来控制发光。然而，在驱动OLED发光的像素驱动电路中，由于工艺制程和器件老化等原因，各像素点的驱动晶体管的阈值电压存在不均匀性。这样就导致了流过每个像素点中的OLED的电流发生变化，从而影响整个屏幕的显示效果。
另外，参考目前触控技术的发展趋势，与电容式触控方式相比，光感触控除了具备同样的触控灵敏度以外，还不受模组本身尺寸的限制。下面参考附图来描述本公开实施例提出的具有光学感应功能的像素电路以及具有其的触控显示装置。
图1是根据本公开实施例的像素电路100的示意性框图。如图1所示，像素电路100可包括像素驱动电路10、光学感应电路20和发光元件30(例如，有机发光二极管)。像素驱动电路10耦接第一控制线Em1、第二控制线Em2、扫描线Scan1、数据线Data、光学感应电路20和发光元件30，并被配置为基于来自第一控制线Em1的第一控制信号、来自第二控制线Em2的第二控制信号、来自扫描线Scan1的扫描信号和来自数据线Data的数据信号，驱动发光元件30发光。光学感应电路20耦接第一控制线Em1、 第二控制线Em2、扫描线Scan1、数据线Data、读取线RL和像素驱动电路10，并被配置为感应光信号，并将所感应的光信号转换为电信号，以及基于第一控制信号、第二控制信号、扫描信号和数据信号，通过读取线RL输出电信号。
根据本公开实施例的像素电路100能够实现光学感应与像素驱动的整合。此外，像素驱动电路10与光学感应电路20共用第一控制线Em1、第二控制线Em2、扫描线Scan1和数据线Data，这实现了光学感应与像素驱动的高效整合，节省了像素电路的布局空间。
图2示出根据本公开的实施例的像素电路200的示例电路图。
如图2所示，光学感应电路20可包括光电传感器201和信号控制电路(光学感应电路20中除了光电传感器201的部分)。光电传感器201被配置为感应光信号，并将所感应的光信号转换为电信号。
信号控制电路与光电传感器201耦接，并被配置为基于第一控制信号、第二控制信号、扫描信号和数据信号，将来自光电传感器201的电信号通过读取线RL输出。
如图2所示，信号控制电路可包括：第一电容器C1、感应重置单元202、感应写入单元203和感应控制单元204。第一电容器C1与光电传感器201、感应重置单元202、感应写入单元203和感应控制单元204耦接。感应重置单元202与第一控制线Em1和提供重置信号的重置信号提供端Vcom耦接，并被配置为基于第一控制线Em1提供的第一控制信号和重置信号提供端Vcom提供的重置信号，对第一电容器C1和光电传感器201进行重置。感应写入单元203与扫描线Scan1和数据线Data耦接，并被配置为基于扫描线Scan1提供的扫描信号，使数据线Data提供的数据信号通过光电传感器201向第一电容器C1充电。在这里，第一电容器C1的充电电流与光电传感器201所感应到的光信号相关。感应控制单元204与第二控制线Em2和读取线RL耦接，并被配置为基于第二控制线Em2提供的第二控制信号，使第一电容器C1放电以从读取线RL输出电信号。
如图2所示，根据本公开的实施例，光电传感器201可包括感光晶体 管N1。感光晶体管N1的控制极与第一电容器C1的第一端和感光晶体管N1的第一极耦接，感光晶体管N1的第二极与第一电容器C1的第二端耦接。感应重置单元202可包括第一晶体管T1。第一晶体管T1的控制极与第一控制线Em1耦接，第一晶体管T1的第一极与提供重置信号的重置信号提供端Vcom耦接，第一晶体管T1的第二极与感光晶体管N1的第一极和控制极耦接。感应写入单元203可包括第二晶体管T2。第二晶体管T2的控制极与扫描线Scan1耦接，第二晶体管T2的第一极与数据线Data耦接，第二晶体管T2的第二极与感光晶体管N1的第一极和控制极耦接。感应控制单元204可包括第三晶体管T3。第三晶体管T3的控制极与第二控制线Em2耦接，第三晶体管T3的第一极与第一电容器C1的第二端耦接，第三晶体管T3的第二极与读取线RL耦接。
在图2所示的示例中，光学触控模块20可包括感光晶体管N1、第一晶体管T1、第二晶体管T2、第三晶体管T3和第一电容器C1。感光晶体管N1为感光薄膜晶体管(Thin Film Transistor，简称TFT)。第一晶体管T1、第二晶体管T2和第三晶体管T3为开关TFT。在光照射到感光晶体管N1上时感光晶体管N1会产生光电流(即，电信号)，且感光晶体管N1在感应到不同的光照强度的情况下会产生不同强度的光电流。第一晶体管T1、第二晶体管T2和第三晶体管T3起到控制感光TFT的开关的作用。第一电容器C1用于存储感光TFT产生的光电流。另外，第三晶体管T3还起到控制电信号读取的作用。当第三晶体管T3导通时，第一电容器C1存储的光电流可通过读取线RL输出。
像素驱动电路10可包括：第一驱动晶体管M1、第二驱动晶体管M2、第二电容器C2、显示重置单元101、显示写入单元102和显示控制单元103。
第一驱动晶体管M1的控制极和第二极通过第一节点a与第二驱动晶体管M2的控制极耦接，第一驱动晶体管M1的第一极与显示写入单元102耦接。第二驱动晶体管M2的第一极与提供第一电压的第一电压端V1耦接，第二驱动晶体管M2的第二极与显示控制单元103耦接。第二电容器C2的第一端与第一节点a耦接，第二电容器C2的第二端与提供第一电压的第 一电压端V1耦接。显示重置单元101与第一控制线Em1、提供第二电压的第二电压端Vint和第一节点a耦接，并被配置为基于第一控制线Em1提供的第一控制信号和第二电压，对第二电容器C2进行重置。显示写入单元102与扫描线Scan1和数据线Data耦接，并被配置为基于扫描线Scan1提供的扫描信号，使数据线Data提供的数据信号通过显示写入单元102和第一驱动晶体管M1对第二电容器C2充电直至第一驱动晶体管M1截止。显示控制单元103与第二控制线Em2和发光元件30耦接，并被配置为基于第二控制线Em2提供的第二控制信号和第二电容器C2驱动第二驱动晶体管M2生成驱动电流以驱动发光元件30(例如，有机发光二极管OLED)发光。
在本公开的实施例中，显示重置单元101可包括第四晶体管T4。第四晶体管T4的控制极与第一控制线Em1耦接，第四晶体管T4的第一极与提供第二电压的第二电压端Vint耦接，第四晶体管T4的第二极与第一节点a耦接。显示写入单元102可包括第五晶体管T5。第五晶体管T5的控制极与扫描线Scan1耦接，第五晶体管T5的第一极与数据线Data耦接，第五晶体管T5的第二极与第一驱动晶体管M1的第一极耦接。显示控制单元103可包括第六晶体管T6。第六晶体管T6的控制极与第二控制线Em2耦接，第六晶体管T6的第一极与第二驱动晶体管M2的第二极耦接，第六晶体管T6的第二极与发光元件30(例如，有机发光二极管OLED)耦接。
在图2所示的示例中，像素驱动电路10可包括第一驱动晶体管M1、第二驱动晶体管M2、第二电容器C2、第四晶体管T4、第五晶体管T5和第六晶体管T6。第一驱动晶体管M1和第二驱动晶体管M2为驱动TFT。第四晶体管T4、第五晶体管T5和第六晶体管T6为开关TFT。像素驱动电路10通过控制第四晶体管T4、第五晶体管T5和第六晶体管T6来驱动第二驱动晶体管M2生成驱动电流，以驱动发光元件30发光。
根据本公开的实施例，感光晶体管N1、第一晶体管T1、第二晶体管T2、第三晶体管T3、第一驱动晶体管M1、第二驱动晶体管M2、第四晶体管T4、第五晶体管T5和第六晶体管T6均可采用“P”型TFT。像素驱动 电路10和光学感应电路20中的晶体管全部采用“P”型TFT的布局方式有利于工艺制程。
在本公开的实施例中，像素驱动电路10可基于第一控制信号、第二控制信号、扫描信号和数据信号向有机发光二极管30输出电信号。有机发光二极管30通过电子和空穴(带正电的离子)的结合产生辐射光。这样，有机发光二极管30可直接把电转化为光。像素驱动电路10通过稳定的电流来控制有机发光二极管30发光。
根据本公开的实施例，像素电路100可采用低温多晶硅技术(Low Temperature Poly-silicon，简称LTPS)工艺制程，从而使得多个薄膜晶体管加电容器的设计，不会影响模组的开口率。
图3示出用于图2所示的像素电路200的各信号的时序图。在以下的描述中，假定所有晶体管都是P型晶体管。第一电压为高电压，而第二电压为低电压。
如图3所示，在第一阶段Ⅰ，第一控制信号VEm1为低电压。第二控制信号VEm2、数据信号Vdata和扫描信号VScan1为高电压。图4示出根据本公开的实施例的像素电路200在第一阶段Ⅰ的示例性等效电路图，其中，晶体管上的斜线表示该晶体管截止。
由于第一控制信号VEm1为低电压，第一晶体管T1导通。由于扫描信号VScan1为高电压，第二晶体管T2截止。由于第二控制信号VEm2为高电压，第三晶体管T3截止。因此，来自重置信号提供端Vcom的重置信号通过第一晶体管T1对感光晶体管N1进行重置。感光晶体管N1导通，从而使得第一电容器C1被重置。重置信号提供端Vcom可为地端。因此，感光晶体管N1和第一电容器C1通过第一晶体管T1接地。此时感光晶体管N1的控制端接地，因此感光晶体管N1导通。
由于第一控制信号VEm1为低电压，第四晶体管T4导通。因此，第二电压端Vint的第二电压通过第四晶体管T4对第二电容器C2进行重置(如图4中的箭头所示)，以将第二电容器C2的第一端的电压(即，第一节点a的电压)重置为第二电压。在第二电压端Vint提供低电压的情况下， 第一驱动晶体管M1和第二驱动晶体管M2导通。由于扫描信号VScan1为高电压，第五晶体管T5截止。由于第二控制信号VEm2为高电压，第六晶体T6截止。
在第二阶段Ⅱ，扫描信号VScan1为低电压。第一控制信号VEm1、第二控制信号VEm2和数据信号Vdata为高电压。图5示出根据本公开的实施例的像素电路200在第二阶段Ⅱ的示例性等效电路图，其中，晶体管上的斜线表示该晶体管截止。
由于第一控制信号VEm1为高电压，第一晶体管T1截止。因此，来自重置信号提供端的重置信号不影响感光晶体管N1和第一电容器C1。由于扫描信号VScan1为低电压，第二晶体管T2导通。由于第二控制信号VEm2为高电压，第三晶体管T3截止。在第一电容器C1的保持作用下，感光晶体管N1的控制极被保持为低电平，因此感光晶体管N1继续导通。因此，数据线Data提供的数据信号Vdata通过感光晶体管N1向第一电容器C1充电。当有光照射到感光晶体管N1时，感光晶体管N1感应到的光信号的强度增加。感光晶体管N1将所感应到的光信号转换为电信号，因此，第一电容器C1的充电电流增加。对于正常接收光照射的感光晶体管N1，第一电容器C1储存的电信号为固定值。
由于第一控制信号VEm1为高电压，第四晶体管T4截止。因此，第一节点a的电压不受到来自第二电压端Vint的第二电压的影响。由于第二电容器C2的保持作用，第一节点a保持上一阶段的低电压。因此，第一驱动晶体管M1和第二驱动晶体管M2继续导通。由于扫描信号VScan1为低电压，第五晶体管T5导通。因此，数据线提供的数据信号Vdata通过第五晶体管T5和第一驱动晶体管M1对第二电容器C2充电直至第一节点a的电压达到Vdata+Vth1为止。由于第一节点a的电压达到Vdata+Vth1，第一驱动晶体管M1截止。Vth1为第一驱动晶体管M1的阈值电压。由于第二控制信号VEm2为低电压，第六晶体管T6截止。
在第三阶段Ⅲ，第二控制信号VEm2和数据信号Vdata为低电压。第一控制信号VEm1和扫描信号VScan1为高电压。图6示出根据本公开的 实施例的像素电路200在第三阶段Ⅲ的示例性等效电路图，其中，晶体管上的斜线表示该晶体管截止。
由于第一控制信号VEm1为高电压，第一晶体管T1截止。因此，来自重置信号提供端的重置信号不影响感光晶体管N1和第一电容器C1。由于扫描信号VScan1为高电压，第二晶体管T2截止。因此，数据信号Vdata不能够继续通过第二晶体管T2对第一电容器C1充电。由于第二控制信号VEm2为低电压，第三晶体管T3导通。因此，第一电容器C1通过第三晶体管T3进行放电以通过读取线RL输出其存储的电信号。
由于第一控制信号VEm1为高电压，第四晶体管T4截止。因此，第一节点a的电压不受到来自第二电压端Vint的第二电压的影响。由于扫描信号VScan1为高电压，第五晶体管T5截止。因此，第一节点a的电压不受到来自数据信号端Data的数据信号Vdata的影响。由于第二控制信号VEm2为低电压，第六晶体管T6导通。因此，第二驱动晶体管M2生成驱动电流并通过第六晶体管T6向发光元件30(例如有机发光二极管OLED)提供该驱动电流。
根据驱动晶体管饱和电流公式可以得到流经有机发光二极管OLED的电流I OLED为：
I OLED＝K(V GS–Vth2) 2
＝K[(Vdata+Vth1)–V1–Vth2] 2
＝K(Vdata–V1) 2  (1)
其中，V GS为第二驱动晶体管M2的栅源极电压差，即第一节点a的电压与第一电压端V1提供的第一电压V1之差。Vth1为第一驱动晶体管M1的阈值电压。Vth2为第二驱动晶体管M2的阈值电压。根据镜像电路原理，认为Vth1与Vth2近似相等，即Vth1＝Vth2。
由上式(1)中可以看到，此时流经有机发光二极管OLED的电流I OLED不受阈值电压Vth1和Vth2的影响，避免了驱动晶体管由于工艺制程及长时间的操作造成的阈值电压漂移，消除阈值电压对I OLED的影响，保证OLED的正常工作。由此，提高了OLED的使用寿命，并保证屏幕显示的均匀性。
本领域的技术人员应当理解，在本实施例的一个替代实施例中，如图2和图4-6所示的移位寄存器单元100中的晶体管也可以都是N型晶体管。在这种情况下，第一电压端V1输出低电压，第二电压端Vint输出高电压，重置信号提供端输出高电压。在该替代实施例中，各信号在各个阶段的电压(未示出)与图3中示出的各信号在各个阶段的电压相反。
此外，本领域的技术人员还应当理解，在本实施例的其它替代实施例中，还可以不仅仅使用单一类型的晶体管，即，可以设置部分晶体管为N型晶体管，部分晶体管为P型晶体管。基于本公开实施例的任何变型和修改都应该落入本公开的保护范围内。
图7示出根据本公开的实施例的驱动如图1所示的像素电路100的驱动方法的示意性流程图。
如图7所示，在该驱动方法中，在步骤S10，基于第一控制信号Em1，重置光学感应电路20和像素驱动电路10。
在一个示例中，在驱动如图2所示的像素电路200的情况下，基于第一控制信号Em1，向感应重置单元202和光电传感器201提供重置信号，以重置第一电容器C1和光电传感器201。基于第一控制信号Em1，向显示重置单元101提供第二电压，以重置第二电容器C2。
在步骤S11，基于第一控制信号Em1、扫描信号Vscan和数据信号Vdata，将光学感应电路20所感应的光信号转换为电信号，在像素驱动电路10中存储用于驱动发光元件30发光的电压。
在一个示例中，在驱动如图2所示的像素电路200的情况下，基于第一控制信号Em1和扫描信号Vscan，向感应写入单元203和光电传感器201提供数据信号Vdata，以向第一电容器C1提供数据信号Vdata。基于扫描信号Vscan，向显示写入单元102和第一驱动晶体管M1提供数据信号Vdata，以使第二电容器C2充电至第一驱动晶体管M1截止。
在步骤S12，基于第二控制信号Em2，从光学感应电路20输出电信号，以及在像素驱动电路10中，通过所存储的电压对应的电流来驱动发光元件30发光。
在一个示例中，在驱动如图2所示的像素电路200的情况下，基于第二控制信号Em2，使第一电容器C1经由感应控制单元204进行放电，以经由读取线RL输出电信号。基于第二控制信号Em2和第二电容器C2，驱动第二驱动晶体管M2生成驱动电流，并经由显示控制单元103向发光元件30提供驱动电流。
图8是根据本公开的实施例的触控显示装置800的示意性框图。该触控显示装置包括：多个如图1所示的像素电路100，以及处理单元810。
在本公开的一个示例中，可针对光电传感器201对应设置发光单元(未示出)。发光单元可采用预设频率发射光线。当进行触控操作时，发光单元发射的光线可被反射到光电传感器201。光电传感器201根据感应到的反射光线生成电信号。
该处理单元810与该多个像素电路100的读取线RL分别耦接，并被配置为基于来自多条读取线RL的电信号，确定是否发生触控操作。
例如，光学感应电路20通过光电传感器201感应光线。当手指或者激光笔靠近像素电路时，光电传感器201感应到的光信号发生变化，从而导致其输出的电信号发生变化。由此，该处理单元810可根据触控前后电信号变化的差值与预设阈值来确定是否发生触摸操作。
在一个示例中，处理单元810可被配置为基于电信号计算光信号的变化量，并基于光信号的变化量和预设阈值来确定是否发生触控操作。例如，处理单元可包括放大器和处理器。电信号通过读取线RL可被传送到放大器。放大器对电信号进行放大处理，并将放大后的信号传送给处理器。处理器对放大后的信号进行数据分析，以确定光信号的变化量是否超过预设阈值，从而确定是否发生触控操作。具体地，处理器可根据触控前后电信号的变化情况确定光信号的变化量，并将光信号的变化量与无触控操作时的预设阈值进行比较，以及根据比较结果判断是否有触控操作(光信号变化)。例如，如果光信号的变化量大于预设阈值，则确定发生触控操作。
应当理解的是，多个具有光学感应功能的像素电路100与多个子像素对应，每个具有光学感应功能的像素电路100用于驱动对应子像素的发光 元件30发光，并对对应像素上的触控操作进行识别。处理单元810进一步被配置为在确定发生触控操作的情况下，基于相应的像素电路100的读取线RL和第二控制线Em2确定触控位置。在本公开的实施例中，触控位置的X方向坐标由第二控制线Em2确定，触控位置的Y方向坐标由读取线RL确定。例如，当第a条第二控制线Em2和第b条读取线RL对应的光电传感器201感应到的光信号的变化量大于预设阈值时，则确定(a，b)位置发生触控操作。由此，通过读取线RL和第二控制线Em2可确定触控位置的坐标。
需要说明的是，采用有机发光二极管的显示装置可不需要液晶作为灰阶显示的媒介。因此，光感触控不会影响到显示问题。
图9示出根据本公开的实施例的触控显示装置800中的像素电路100的布置的示意图。根据本公开的实施例，像素电路100被设置成彼此间隔的子像素。在图9所示的实施例中，每个3个子像素为一组以构成一个像素单元90，每个像素单元90可包括2个传统的像素电路91和1个根据本公开实施例的像素电路100。传统的像素电路91仅能实现显示功能，而没有实现光学感应功能。根据本公开实施例的像素电路100能够实现光学感应与显示的功能整合。
根据本公开实施例的像素电路可以其它分辨率被设置成彼此间隔的子像素。本公开的实施例对此不作限定。
在一个示例中，触控显示装置可为AMOLED触控显示器。
根据本公开实施例提出的触控显示装置，能够实现显示和光学感应功能的高效整合，提高了产品的附加值。
根据本公开实施例的触控显示装置可以应用于任何具有显示功能的产品，例如，电子纸、手机、平板电脑、电视机、笔记本电脑、数码相框或导航仪等。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。除非上下文 中另外明确地指出，否则在本文和所附权利要求中所使用的词语的单数形式包括复数，反之亦然。因而，当提及单数时，通常包括相应术语的复数。相似地，措辞“包含”和“包括”将解释为包含在内而不是独占性地。同样地，术语“包括”和“或”应当解释为包括在内的，除非本文中明确禁止这样的解释。在本文中使用术语“示例”之处，特别是当其位于一组术语之后时，所述“示例”仅仅是示例性的和阐述性的，且不应当被认为是独占性的或广泛性的。
在本公开中，除非另有明确的规定和限定，术语“安装”、“耦接”、“耦接”、“固定”等术语应做广义理解，例如，可以是固定耦接，也可以是可拆卸耦接，或成一体；可以是机械耦接，也可以是电耦接；可以是直接耦接，也可以通过中间媒介间接耦接，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本公开中的具体含义。
在本公开中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
流程图中或在此以其他方式描述的任何过程或方法描述可以被理解 为，表示包括一个或更多个用于实现定制逻辑功能或过程的步骤的可执行指令的代码的模块、片段或部分，并且本公开的优选实施方式的范围包括另外的实现，其中可以不按所示出或讨论的顺序，包括根据所涉及的功能按基本同时的方式或按相反的顺序，来执行功能，这应被本公开的实施例所属技术领域的技术人员所理解。
在流程图中表示或在此以其他方式描述的逻辑和/或步骤，例如，可以被认为是用于实现逻辑功能的可执行指令的定序列表，可以具体实现在任何计算机可读介质中，以供指令执行***、装置或设备(如基于计算机的***、包括处理器的***或其他可以从指令执行***、装置或设备取指令并执行指令的***)使用，或结合这些指令执行***、装置或设备而使用。就本说明书而言，"计算机可读介质"可以是任何可以包含、存储、通信、传播或传输程序以供指令执行***、装置或设备或结合这些指令执行***、装置或设备而使用的装置。计算机可读介质的更具体的示例(非穷尽性列表)包括以下：具有一个或多个布线的电耦接部(电子装置)，便携式计算机盘盒(磁装置)，随机存取存储器(RAM)，只读存储器(ROM)，可擦除可编辑只读存储器(EPROM或闪速存储器)，光纤装置，以及便携式光盘只读存储器(CDROM)。另外，计算机可读介质甚至可以是可在其上打印所述程序的纸或其他合适的介质，因为可以例如通过对纸或其他介质进行光学扫描，接着进行编辑、解译或必要时以其他合适方式进行处理来以电子方式获得所述程序，然后将其存储在计算机存储器中。
应当理解，本公开的各部分可以用硬件、软件、固件或它们的组合来实现。在上述实施方式中，多个步骤或方法可以用存储在存储器中且由合适的指令执行***执行的软件或固件来实现。如，如果用硬件来实现和在另一实施方式中一样，可用本领域公知的下列技术中的任一项或他们的组合来实现：具有用于对数据信号实现逻辑功能的逻辑门电路的离散逻辑电路，具有合适的组合逻辑门电路的专用集成电路，可编程门阵列(PGA)，现场可编程门阵列(FPGA)等。
本技术领域的普通技术人员可以理解实现上述实施例方法携带的全部 或部分步骤是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，该程序在执行时，包括方法实施例的步骤之一或其组合。
此外，在本公开各个实施例中的各功能单元可以集成在一个处理模块中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。所述集成的模块如果以软件功能模块的形式实现并作为独立的产品销售或使用时，也可以存储在一个计算机可读取存储介质中。
上述提到的存储介质可以是只读存储器，磁盘或光盘等。尽管上面已经示出和描述了本公开的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本公开的限制，本领域的普通技术人员在本公开的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (18)

  1. 一种像素电路，包括：像素驱动电路、光学感应电路和发光元件；
    其中，所述像素驱动电路被配置为基于来自第一控制线的第一控制信号、来自第二控制线的第二控制信号、来自扫描线的扫描信号和来自数据线的数据信号，驱动所述发光元件发光；
    其中，所述光学感应电路被配置为感应光信号，并将所感应的光信号转换为电信号，以及基于所述第一控制信号、所述第二控制信号、所述扫描信号和所述数据信号，通过读取线输出所述电信号。
  2. 根据权利要求1所述的像素电路，其中，所述光学感应电路包括光电传感器和信号控制电路，
    其中，所述光电传感器被配置为感应光信号，并将所感应的光信号转换为电信号；
    其中，所述信号控制电路与所述光电传感器耦接，并被配置为基于所述第一控制信号、所述第二控制信号、所述扫描信号和所述数据信号，将来自所述光电传感器的所述电信号通过所述读取线输出。
  3. 根据权利要求2所述的像素电路，其中，所述信号控制电路包括：第一电容器，感应重置单元，感应写入单元和感应控制单元，
    其中，所述第一电容器与所述光电传感器、所述感应重置单元、感应写入单元和感应控制单元耦接；
    其中，所述感应重置单元与所述第一控制线和提供重置信号的重置信号提供端耦接，并被配置为基于所述第一控制信号和所述重置信号，对所述第一电容器和所述光电传感器进行重置；
    其中，所述感应写入单元与所述扫描线和所述数据线耦接，并被配置为基于所述扫描信号，使所述数据信号通过所述光电传感器向所述第一电容器充电，其中，所述第一电容器的充电电流与所述光电传感器所感应到的光信号相关；
    其中，所述感应控制单元与所述第二控制线和所述读取线耦接，并被配置为基于所述第二控制信号，使所述第一电容器放电以从所述读取线输 出所述电信号。
  4. 根据权利要求3所述的像素电路，其中，所述光电传感器包括感光晶体管，
    其中，所述感光晶体管的控制极与所述第一电容器的第一端和所述感光晶体管的第一极耦接，所述感光晶体管的第二极与所述第一电容器的第二端耦接。
  5. 根据权利要求3或4所述的像素电路，其中，所述感应重置单元包括第一晶体管，
    其中，所述第一晶体管的控制极与所述第一控制线耦接，所述第一晶体管的第一极与所述重置信号提供端耦接，所述第一晶体管的第二极与所述感光晶体管的第一极和控制极耦接。
  6. 根据权利要求3-5中任一项所述的像素电路，其中，所述感应写入单元包括第二晶体管，
    其中，所述第二晶体管的控制极与所述扫描线耦接，所述第二晶体管的第一极与所述数据线耦接，所述第二晶体管的第二极与所述感光晶体管的第一极和控制极耦接。
  7. 根据权利要求3-6中任一项所述的像素电路，其中，所述感应控制单元包括第三晶体管，
    其中，所述第三晶体管的控制极与所述第二控制线耦接，所述第三晶体管的第一极与所述第一电容器的第二端耦接，所述第三晶体管的第二极与所述读取线耦接。
  8. 根据权利要求1-7中任一项所述的像素电路，其中，所述像素驱动电路包括：第一驱动晶体管，第二驱动晶体管，第二电容器，显示重置单元，显示写入单元和显示控制单元，
    其中，所述第一驱动晶体管的控制极和第二极通过第一节点与所述第二驱动晶体管的控制极耦接，所述第一驱动晶体管的第一极与所述显示写入单元耦接；
    其中，所述第二驱动晶体管的第一极与提供第一电压的第一电压端耦 接，所述第二驱动晶体管的第二极与所述显示控制单元耦接；
    其中，所述第二电容器的第一端与所述第一节点耦接，所述第二电容器的第二端与所述第一电压端耦接；
    其中，所述显示重置单元与所述第一控制线、提供第二电压的第二电压端和第一节点耦接，并被配置为基于所述第一控制信号和所述第二电压，对所述第二电容器进行重置；
    其中，所述显示写入单元与所述扫描线和所述数据线耦接，并被配置为基于所述扫描信号，使所述数据信号通过所述显示写入单元和所述第一驱动晶体管对所述第二电容器充电直至所述第一驱动晶体管截止；
    其中，所述显示控制单元与所述第二控制线和所述发光元件耦接，并被配置为基于所述第二控制信号和所述第二电容器驱动所述第二驱动晶体管生成驱动电流以驱动所述发光元件发光。
  9. 根据权利要求8所述的像素电路，其中，所述显示重置单元包括第四晶体管，
    其中，所述第四晶体管的控制极与所述第一控制线耦接，所述第四晶体管的第一极与所述第二电压端耦接，所述第四晶体管的第二极与所述第一节点耦接。
  10. 根据权利要求8或9所述的像素电路，其中，所述显示写入单元包括第五晶体管，
    其中，所述第五晶体管的控制极与所述扫描线耦接，所述第五晶体管的第一极与所述数据线耦接，所述第五晶体管的第二极与所述第一驱动晶体管的第一极耦接。
  11. 根据权利要求8-10中任一项所述的像素电路，其中，所述显示控制单元包括第六晶体管，
    其中，所述第六晶体管的控制极与所述第二控制线耦接，所述第六晶体管的第一极与所述第二驱动晶体管的第二极耦接，所述第六晶体管的第二极与所述发光元件耦接。
  12. 一种触控显示装置，包括：多个根据权利要求1-11中任一项所述 的像素电路；以及
    处理单元，其与所述多个像素电路的读取线分别耦接，并被配置为基于来自所述多条读取线的电信号，确定是否发生触控操作。
  13. 根据权利要求12所述的触控显示装置，其中，所述处理单元被配置为基于所述电信号计算光信号的变化量，并基于所述光信号的变化量和预设阈值来确定是否发生触控操作。
  14. 根据权利要求13所述的触控显示装置，其中，所述处理单元进一步被配置为在确定发生触控操作的情况下，基于相应的像素电路的读取线和第二控制线确定触控位置。
  15. 根据权利要求12-14中任一项所述的触控显示装置，其中，所述多个像素电路被设置成彼此间隔的子像素。
  16. 一种驱动根据权利要求1所述的像素电路的驱动方法，包括：
    基于所述第一控制信号，重置所述光学感应电路和所述像素驱动电路；
    基于所述第一控制信号、所述扫描信号和所述数据信号，将所述光学感应电路所感应的光信号转换为电信号，在所述像素驱动电路中存储用于驱动所述发光元件发光的电压；以及
    基于所述第二控制信号，从所述光学感应电路输出所述电信号，以及在所述像素驱动电路中，通过所存储的电压对应的电流来驱动所述发光元件发光。
  17. 根据权利要求16所述的驱动方法，其中，所述像素电路是根据权利要求3所述的像素电路，
    其中，所述驱动方法包括：
    基于所述第一控制信号，向所述感应重置单元和所述光电传感器提供所述重置信号，以重置所述第一电容器和光电传感器；
    基于所述第一控制信号和所述扫描信号，向所述感应写入单元和所述光电传感器提供所述数据信号，以向所述第一电容器提供所述数据信号；以及
    基于所述第二控制信号，使所述第一电容器经由所述感应控制单元进 行放电，以经由所述读取线输出所述电信号。
  18. 根据权利要求16或17所述的驱动方法，其中，所述像素驱动电路是根据权利要求8所述的像素电路，
    其中，所述驱动方法还包括：
    基于所述第一控制信号，向所述显示重置单元提供第二电压，以重置所述第二电容器；
    基于所述扫描信号，向所述显示写入单元和所述第一驱动晶体管提供所述数据信号，以使所述第二电容器充电至所述第一驱动晶体管截止；以及
    基于所述第二控制信号和所述第二电容器，驱动所述第二驱动晶体管生成驱动电流，并经由所述显示控制单元向所述发光元件提供所述驱动电流。
PCT/CN2018/092402 2017-08-08 2018-06-22 像素电路及其驱动方法以及触控显示装置 WO2019029282A1 (zh)

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