WO2018120776A1 - 像素电路及其驱动方法、显示面板和显示装置 - Google Patents

像素电路及其驱动方法、显示面板和显示装置 Download PDF

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Publication number
WO2018120776A1
WO2018120776A1 PCT/CN2017/093290 CN2017093290W WO2018120776A1 WO 2018120776 A1 WO2018120776 A1 WO 2018120776A1 CN 2017093290 W CN2017093290 W CN 2017093290W WO 2018120776 A1 WO2018120776 A1 WO 2018120776A1
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Prior art keywords
circuit
transistor
voltage
light emitting
emitting device
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PCT/CN2017/093290
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English (en)
French (fr)
Inventor
岳晗
陈小川
杨盛际
刘冬妮
王磊
肖丽
卢鹏程
付杰
Original Assignee
京东方科技集团股份有限公司
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Priority to US15/751,300 priority Critical patent/US10909925B2/en
Publication of WO2018120776A1 publication Critical patent/WO2018120776A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—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 voltage across the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • 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
    • G09G2300/088—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 using a non-linear two-terminal element
    • G09G2300/089—Pixel comprising a non-linear two-terminal element in series with each display pixel element, the series comprising also other elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • 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
    • G09G2360/145—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
    • G09G2360/148—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 the light being detected by light detection means within each pixel

Definitions

  • Embodiments of the present disclosure relate to a pixel circuit and a driving method thereof, a display panel, and a display device.
  • OLED display devices are gradually receiving advantages due to their wide viewing angle, high contrast ratio, fast response speed, and higher illumination brightness and lower driving voltage than inorganic light-emitting display devices. People's widespread concern.
  • the OLED display device includes an array of organic light emitting diodes, and the organic light emitting diode can emit light, for example, driven by a driving current output from the thin film transistor.
  • At least one embodiment of the present disclosure provides a pixel circuit including a light emitting device, a driving circuit, a brightness detecting circuit, a voltage comparing circuit, and a compensation control circuit.
  • the driving circuit is configured to drive the light emitting device to emit light;
  • the brightness detecting circuit is configured to detect the brightness of the light emitting device, and obtain a light sensitive voltage corresponding to the brightness of the light emitting device according to the brightness of the light emitting device;
  • the voltage comparison circuit is configured to The light-receiving voltage is compared with a reference voltage to obtain a compensation voltage, wherein the reference voltage is a light-sensing voltage obtained by the brightness detecting circuit when the brightness of the light-emitting device is a target brightness; and the compensation control circuit is configured to compensate the voltage A voltage is supplied to the drive circuit.
  • the driving circuit is electrically connected to a first power terminal, the compensation control circuit, and the light emitting device; and the compensation control circuit is compared with the voltage
  • the output end of the circuit is electrically connected;
  • the brightness detecting circuit is electrically connected to the input end of the voltage comparing circuit; and the second end of the light emitting device is connected to the second power end.
  • the pixel circuit further includes an illumination control circuit configured to control whether the illumination device is caused to emit light.
  • the driving circuit includes a first transistor, a second transistor, and a first capacitor; and a control terminal of the first transistor is connected to the scan.
  • a first line of the first transistor is connected to the signal line, a second end of the first transistor is connected to a control end of the second transistor and a first end of the first capacitor;
  • the second transistor The first end is connected to the first power terminal, and the second end of the second transistor is connected to the light emitting device or the light emitting control circuit; the second end of the first capacitor is connected to the compensation control circuit.
  • the light emission control circuit includes a third transistor, and a control end of the third transistor is connected to the light emission control line, and the first end of the third transistor is connected. a second end of the second transistor, the second end of the third transistor being coupled to the first end of the light emitting device.
  • the compensation control circuit includes a fourth transistor and a fifth transistor; a control terminal of the fourth transistor is connected to the scan line, and the fourth transistor The first end is connected to the second end of the first capacitor and the second end of the fifth transistor, the second end of the fourth transistor is grounded; the control end of the fifth transistor is connected to the compensation control line, the fifth transistor The first end is connected to the voltage comparison circuit, and the second end of the fifth transistor is connected to the second end of the first capacitor.
  • the brightness detecting circuit includes a resistor connected in parallel with the photosensitive element, and the first end of the photosensitive element is connected to an input end of the voltage comparison circuit. The second end of the photosensitive element is grounded.
  • the light emitting device is an organic light emitting diode.
  • At least one embodiment of the present disclosure also provides a display panel including the pixel circuit described above.
  • At least one embodiment of the present disclosure also provides a display device including the above-described pixel circuit or the above display panel.
  • At least one embodiment of the present disclosure further provides a driving method of a pixel circuit
  • the driving method of the pixel circuit includes: driving a light emitting device to emit light; detecting brightness of the light emitting device, and acquiring, according to brightness of the light emitting device, corresponding to a light-sensing voltage of the brightness of the light-emitting device; comparing the light-sensing voltage with a reference voltage to obtain a compensation voltage, wherein the reference voltage is a light-sensing voltage obtained when the brightness of the light-emitting device is a target brightness; The compensation voltage is supplied to a drive circuit.
  • the photosensitive voltage value corresponding to the luminance of the light emitting device is V 0
  • the reference voltage value is V Ref , which is supplied to the driving.
  • At least one embodiment of the present disclosure also provides a pixel circuit including a light emitting device, a driving circuit, and a compensation voltage obtaining circuit.
  • the driving circuit is configured to drive the light emitting device to emit light;
  • the compensation voltage acquiring circuit is configured to acquire a compensation voltage based on a brightness of the light emitting device, the compensation voltage being supplied to the driving circuit.
  • a pixel circuit provided by at least one embodiment of the present disclosure further includes a compensation control circuit configured to provide the compensation voltage to the drive circuit.
  • a pixel circuit provided by at least one embodiment of the present disclosure further includes an illumination control circuit configured to control whether the illumination device is caused to emit light.
  • the light emission control circuit is electrically connected to the driving circuit and the light emitting device, and is configured to control whether to provide an electrical signal output by the driving circuit.
  • the light emitting device is given.
  • a first end of the light emitting device is electrically connected to the light emitting control circuit or the driving circuit, and a second end of the light emitting device is The second power terminal is electrically connected.
  • the driving circuit includes a driving element, a light emitting selection circuit, and a first capacitor.
  • a driving element configured to drive the light emitting device to emit light
  • a light emitting selection circuit configured to write a base data signal to a control end of the driving element
  • the first capacitor configured to maintain the base data signal at the driving The control end of the component.
  • the driving circuit further includes a first node;
  • the light emitting selection circuit includes a first transistor, and the first end of the first transistor is configured to be electrically connected To the signal line, a second end of the first transistor is configured to be electrically connected to the first node;
  • the driving element includes a second transistor, and a first end of the second transistor is configured to be electrically connected to the a power terminal, the second end of the second transistor is configured to be electrically connected to the light emitting device or the light emitting control circuit;
  • a first end of the first capacitor is configured to be electrically connected to the first node, The second end of the first capacitor is configured to be electrically coupled to the compensation control circuit.
  • the compensation voltage acquisition circuit includes a brightness detection circuit and a signal comparison circuit.
  • a brightness detecting circuit configured to detect a brightness of the light emitting device to acquire a light sensitive signal corresponding to a brightness of the light emitting device;
  • the circuit is configured to compare the photosensitive signal to a reference signal to obtain the compensation voltage.
  • the brightness detecting circuit includes a photosensitive element and a first resistor, and the photosensitive element is configured to convert light incident on the photosensitive element into a photosensitive current a signal, the first resistor configured to convert the photosensitive current signal into a photosensitive voltage signal;
  • the signal comparison circuit includes a first input, a second input, and a signal output, the first input configured to receive a second input configuration configured to receive the photosensitive voltage signal, the signal output configured to output the compensation voltage acquired based on the reference voltage signal and the photosensitive voltage signal.
  • the signal comparison circuit is a voltage comparison circuit
  • the voltage comparison circuit includes a sixth transistor, a seventh transistor, an eighth transistor, a second resistor, and a a third node; a first end of the sixth transistor is configured to be electrically connected to the first high voltage source, and a second end of the sixth transistor is configured to be electrically connected to the third node, the control end of the sixth transistor
  • the first end of the seventh transistor is configured to be electrically connected to the third node, and the second end of the seventh transistor is configured to be electrically connected to the first low voltage source V L1 , a control terminal of the seventh transistor is configured as the second input terminal; a first end of the eighth transistor is configured to be electrically connected to a second high voltage source, and a second end of the eighth transistor is configured to be the signal An output end, the control end of the eighth transistor is configured to be electrically connected to the third node; the first end of the second resistor is configured to be electrically
  • the compensation control circuit includes an initial voltage supply circuit and a compensation voltage supply circuit: the initial voltage supply circuit is configured to provide an initial voltage to the drive circuit; A voltage supply circuit is configured to provide the compensation voltage to the drive circuit.
  • the pixel circuit further includes a second node, and the second end of the first capacitor is configured to be electrically connected to the second node;
  • the voltage supply circuit includes a fourth transistor, the first end of the fourth transistor is electrically connected to the third power terminal, and the second end of the fourth transistor is electrically connected to the second node;
  • the compensation voltage supply circuit includes a fifth transistor, the first end of the fifth transistor being electrically connected to the second node, A second end of the fifth transistor is electrically coupled to an output of the signal comparison circuit.
  • At least one embodiment of the present disclosure further provides a driving method of a pixel circuit, the driving method of the pixel circuit includes: driving a light emitting device to emit light; acquiring a compensation voltage based on a brightness of the light emitting device; the compensation voltage is supplied to the driving Circuit.
  • the method further includes: providing the compensation voltage to the driving circuit.
  • the method further includes: controlling whether to provide an electrical signal output by the driving circuit to the light emitting device.
  • acquiring a compensation voltage based on brightness of the light emitting device includes: detecting brightness of the light emitting device to acquire brightness corresponding to the light emitting device Sensing signal; comparing the photosensitive signal with a reference signal to obtain the compensation voltage.
  • Embodiments of the present disclosure provide a pixel circuit and a driving method thereof, a display panel, and a display device, which implement a brightness compensation function.
  • FIG. 1 is a schematic structural view of a pixel circuit
  • FIG. 2 is a schematic structural diagram of a pixel circuit according to Embodiment 1 of the present disclosure
  • FIG. 3A is an exemplary block diagram of a pixel circuit according to Embodiment 2 of the present disclosure.
  • FIG. 3B is an exemplary structural diagram of the pixel circuit illustrated in FIG. 3A; FIG.
  • FIG. 4A is an exemplary circuit diagram of the pixel circuit shown in FIG. 3A;
  • FIG. 4B is a specific implementation of a circuit diagram of the pixel circuit shown in FIG. 4A;
  • FIG. 5A is an exemplary structural diagram of a compensation voltage acquisition circuit according to Embodiment 2 of the present disclosure.
  • 5B is an exemplary circuit diagram of a brightness detecting circuit provided by Embodiment 2 of the present disclosure.
  • 5C is an exemplary circuit diagram of a voltage comparison circuit provided by Embodiment 2 of the present disclosure.
  • FIG. 6 is an exemplary driving timing diagram of the pixel circuit shown in FIG. 4B of the present disclosure.
  • C storage capacitor
  • 1 lighting device
  • 2 drive circuit
  • 3 brightness detection circuit
  • 4 voltage comparison circuit
  • 5 compressor control circuit
  • 6 lighting control circuit
  • 21 driving element
  • 30 compensation voltage acquisition circuit
  • 51 initial voltage supply circuit
  • 71 first node
  • 72 second node
  • 73 third node
  • C1 first capacitor
  • R1 first resistance
  • R2 second resistance
  • Q1 first transistor
  • Q2 second transistor
  • Q3 third transistor
  • Q5 fifth transistor
  • Q6 sixth transistor
  • S2 compensation control line
  • VDD first power supply terminal
  • VSS second power supply terminal
  • VD1 third power supply terminal.
  • FIG. 1 is a schematic structural diagram of a pixel circuit.
  • the pixel circuit shown in FIG. 1 is a 2T1C circuit, that is, two TFTs (Thin-film transistors) and one storage capacitor (C) are used for driving.
  • the 2T1C type pixel circuit may include a first transistor Q1 (ie, a selection transistor), a second transistor Q2 (ie, a driving transistor), and a storage capacitor C.
  • the The control terminal of the first transistor Q1 can receive the scan signal
  • the first end of the first transistor Q1 can be electrically connected to the signal line Data to receive the data signal
  • the second end of the first transistor Q1 can be electrically connected to the control of the second transistor Q2. end.
  • the first terminal of the second transistor Q2 may be electrically connected to the first power terminal VDD.
  • the first power terminal VDD may be a voltage source to output a constant positive voltage, or may be a current source or the like; the second transistor Q2 The second end may be electrically connected to the first end of the light emitting element EL (eg, the positive end of the OLED).
  • the first end of the storage capacitor C is electrically connected to the first end of the second transistor Q2 and the first power terminal VDD; the second end of the storage capacitor C is electrically connected to the second end of the first transistor Q1 and the second transistor Q2
  • the second end of the light emitting element EL (for example, the negative end of the OLED) is electrically connected to the second power terminal VSS.
  • the second power terminal VSS may be a ground.
  • the 2T1C pixel circuit is driven by controlling the brightness and darkness (grayscale) of a pixel via two TFTs and a storage capacitor C.
  • a scan signal is applied through the scan line to turn on the first transistor Q1
  • the data voltage supplied from the data drive circuit through the signal line charges the storage capacitor C via the first transistor Q1, thereby storing the data voltage in the storage capacitor C.
  • the stored data voltage controls the degree of conduction of the second transistor Q2, thereby controlling the magnitude of the current flowing through the second transistor Q2 and driving the light emitting element EL (eg, OLED), that is, the current determines the gray of the pixel.
  • the light emitting element EL eg, OLED
  • the inventors have noted that factors such as the operating temperature of the pixel circuit or the degree of aging of the light-emitting element EL or/and the transistor (eg, the second transistor Q2) may affect the light flowing through the second transistor Q2 and driving the light-emitting element EL (eg, OLED).
  • the magnitude of the current thus causes the luminance of the pixel circuit to deviate from a predetermined luminance value (for example, above or below a predetermined luminance value), and thereby causes deterioration in the quality of the displayed image, thereby affecting the user's experience.
  • the transistor can be divided into N-type and P-type transistors according to the characteristics of the transistor.
  • the embodiment of the present disclosure elaborates the technical solution of the present disclosure by taking the transistor as a P-type transistor as an example, but the implementation of the present disclosure.
  • the transistor of the example is not limited to a P-type transistor, and one skilled in the art can also implement one or more transistors in the embodiments of the present disclosure by using an N-type transistor according to actual needs. These transistors are, for example, thin film transistors.
  • At least one embodiment of the present disclosure provides a pixel circuit including a light emitting device, a driving circuit, and a compensation voltage obtaining circuit.
  • the driving circuit is configured to drive the light emitting device to emit light;
  • the compensation voltage acquiring circuit is configured to obtain a compensation voltage based on the brightness of the light emitting device, and the compensation voltage is supplied to the driving circuit.
  • At least one embodiment of the present disclosure also provides a display panel including the pixel circuit described above. At least one embodiment of the present disclosure also provides a display device including the above-described pixel circuit or the above display panel.
  • At least one embodiment of the present disclosure also provides a driving method of a pixel circuit, the driving method of the pixel circuit includes: driving a light emitting device to emit light; acquiring a compensation voltage based on a brightness of the light emitting device, the compensation voltage being supplied to the driving circuit.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the pixel circuit may include: a light emitting device 1, a driving circuit 2, a brightness detecting circuit 3, a voltage comparing circuit 4, and a compensation control circuit 5.
  • the driving circuit 2 is for driving the light emitting device 1 to emit light
  • the brightness detecting circuit 3 is for detecting the brightness of the light emitting device 1, and acquiring a light receiving voltage corresponding to the brightness of the light emitting device 1 according to the brightness of the light emitting device 1
  • the voltage comparing circuit 4 is configured In order to compare the photosensitive voltage with the reference voltage to obtain a compensation voltage, where the reference voltage is the light-sensing voltage obtained by the brightness detecting circuit when the brightness of the light-emitting device is the target brightness
  • the compensation control circuit 5 is configured to provide the compensation voltage to the driving circuit 2.
  • the brightness detecting circuit 3 can convert the light incident thereon into a light-sensitive voltage and provide a voltage comparison.
  • the circuit 4, then the voltage comparison circuit 4 can compare the photosensitive voltage with the reference voltage and can obtain a compensation voltage
  • the compensation control circuit 5 supplies the compensation voltage to the driving circuit 2
  • the driving circuit 2 can be adjusted according to the compensation voltage (for example,
  • the current supplied to the light emitting device 1 is adjusted in real time, so that the light emitting luminance of the light emitting device 1 can be adjusted (for example, the light emitting luminance of the light emitting device 1 can be adjusted to the target luminance), whereby the light emitting luminance of the light emitting device 1 (for example, OLED) can be prevented. Deviation from the target brightness value, and thus the display quality of the display device including the pixel circuit can be improved.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 3A is an exemplary block diagram of a pixel circuit 100 provided by Embodiment 2 of the present disclosure
  • FIG. 3B is an exemplary structure of the pixel circuit 100 illustrated in FIG. 3A. Figure.
  • the pixel circuit 100 may include a light emitting device 1, a driving circuit 2, and a compensation voltage obtaining circuit 30.
  • the driving circuit 2 may be configured to drive the light emitting device 1 to emit light;
  • the compensation voltage acquiring circuit 30 may be configured to acquire a compensation voltage based on the brightness of the light emitting device 1, which may be supplied to the driving circuit 2.
  • the pixel circuit 100 may include an illumination control circuit 6 (see FIG. 3B) according to actual application requirements.
  • the illumination control circuit is configured to control whether the illumination device is caused to emit light.
  • the specific setting position of the illuminating control circuit can be set according to actual application requirements, and the embodiment of the present disclosure does not specifically limit this.
  • the illumination control circuit 6 can be electrically connected to the drive circuit 2 or/and the illumination device 1.
  • the light emission control circuit 6 may be disposed between the drive circuit 2 and the first power supply terminal VDD.
  • the light emission control circuit 6 may also be disposed between the light emitting device 1 and the second power supply terminal VSS.
  • the illumination control circuit 6 can also be disposed between the drive circuit 2 and the light emitting device 1.
  • the light emission control circuit 6 can be configured to control whether or not the light emitting device is caused to emit light, and the light emission control circuit 6 can control the light emitting device 1 by, for example, controlling whether or not the electric signal (for example, a current signal) output from the drive circuit 2 is supplied to the light emitting device 1. Whether it shines.
  • the electric signal for example, a current signal
  • the specific forms of the illuminating device 1, the driving circuit 2, the compensating voltage acquiring circuit 30, and the illuminating control circuit 6 can be set according to actual application requirements, and the embodiment of the present disclosure does not specifically limit this.
  • the pixel circuit 100 provided in the second embodiment of the present disclosure may be implemented as a circuit as shown in FIG. 4A.
  • FIG. 4B is a specific implementation of the circuit diagram of the pixel circuit 100 shown in FIG. 4A, but the circuit shown in FIG. 4A is not limited to the specific implementation shown in FIG. 4B.
  • the light-emitting device 1 may be a current-driven light-emitting device 1 such as an LED (Light Emitting Diode) or an OLED (Organic Light Emitting Diode), but the embodiment of the present disclosure is not limited thereto.
  • the embodiment of the present disclosure describes the technical solution of the present disclosure by taking the light emitting device 1 as an OLED as an example, but the light emitting device 1 of the present disclosure is not limited to the OLED.
  • the second end (eg, the cathode end) of the light emitting device 1 may be connected to the second power supply terminal VSS.
  • the second power supply terminal VSS may output a constant voltage
  • the second power supply terminal VSS may be grounded, for example, but embodiments of the present disclosure are not limited thereto.
  • the drive circuit 2 may include a drive element 21, a light emission selection circuit 22, and a first capacitance C1.
  • the driving element 21 is configured to drive an illuminator Piece 1 shines.
  • the illumination selection circuit 22 is configured to write the underlying data signal to the control terminal of the drive element 21.
  • the first capacitor C1 is configured to hold the base data signal at the control end of the drive element 21.
  • the specific form of the driving component 21, the illuminating selection circuit 22, and the first capacitor C1 may be set according to actual application requirements, and the embodiment of the present disclosure does not specifically limit this.
  • the drive circuit 2 may further include a first node 71.
  • the illumination selection circuit 22 can include a first transistor Q1.
  • the first end of the first transistor Q1 is configured to be electrically connected to the signal line Data
  • the second end of the first transistor Q1 is configured to be electrically connected to the first node 71
  • the control end of the first transistor Q1 is configured to be electrically connected to the scan
  • the line, the scan line may be, for example, a gate line (for example, the gate line Gate shown in FIG. 4B).
  • the on and off of the first transistor Q1 can be controlled by a signal (for example, an on signal or an off signal) supplied from a scan line.
  • the driving element 21 may include a second transistor Q2.
  • the first terminal of the second transistor Q2 is configured to be electrically connected to the first power terminal VDD, and the first power terminal VDD can output a constant voltage, for example, and the voltage output by the first power terminal VDD can be, for example, greater than the second power terminal VSS.
  • embodiments of the present disclosure are not limited thereto.
  • the second end of the second transistor Q2 is configured to be electrically connected to the light emitting device 1 or the light emission control circuit 6; for example, in the case where the pixel circuit 100 further includes the light emission control circuit 6, the second end of the second transistor Q2 is configured as Electrically connected to the illumination control circuit 6; again, for example, where the pixel circuit 100 does not include the illumination control circuit 6, the second end of the second transistor Q2 is configured to be electrically coupled to the illumination device 1.
  • the control terminal of the second transistor Q2 is configured to be electrically connected to the first node 71.
  • the first end of the first capacitor C1 is configured to be electrically connected to the first node 71
  • the second end of the first capacitor C1 is configured to be electrically connected to the compensation control circuit 5.
  • the control terminal of the first transistor Q1 receives an on signal (for example, a low level signal)
  • the underlying data signal eg, V Data
  • the first transistor Q1 that is turned on is written to the first node 71 (i.e., the control terminal of the driving element 21 and the first terminal of the first capacitor C1).
  • the first capacitor C1 is configured to hold the base data signal at the control end of the drive element 21, and the drive element 21 can be placed in an on state according to actual needs.
  • the voltage of the control terminal of the second transistor Q2 (for example, V Data ) can control the degree of conduction of the second transistor Q2, and thus can control the magnitude of the driving current supplied from the driving circuit 2 to the light emitting device 1, thereby determining the light emitting device.
  • V Data the voltage of the control terminal of the second transistor Q2
  • the degree of conduction of the second transistor Q2 can control the magnitude of the driving current supplied from the driving circuit 2 to the light emitting device 1, thereby determining the light emitting device.
  • the brightness of 1 and the gray scale of the illumination of the pixel circuit 100 can control the degree of conduction of the second transistor Q2, and thus can control the magnitude of the driving current supplied from the driving circuit 2 to the light emitting device 1, thereby determining the light emitting device.
  • the light emission control circuit 6 may include the third transistor Q3.
  • the second end of the third transistor Q3 may be electrically connected to the first end (eg, the anode end) of the light emitting device 1; the first end of the third transistor Q3 may be coupled to the output end of the driving circuit 2 (ie, the second transistor) The second end of Q2 is electrically connected).
  • the on and off of the third transistor Q3 can be controlled by the signal supplied from the illumination control line S1.
  • an electrical signal (eg, a current signal) output by the drive circuit 2 may be supplied to the illumination device via the turned-on illumination control circuit 6. 1, and the light-emitting device 1 is caused to emit light; when the third transistor Q3 is turned off, no driving current flows through the light-emitting device 1, and thus the light-emitting device 1 does not emit light.
  • the following describes the technical solution of the embodiment in which the pixel circuit 100 includes the illuminating control circuit 6 as an example.
  • the pixel circuit 100 of the present embodiment may not include the illuminating control circuit 6.
  • the first end of the illuminating device 1 may be Directly connected to the output of the drive circuit 2.
  • the pixel circuit 100 provided by the embodiment of the present disclosure may acquire the compensation voltage based on the brightness of the light emitting device 1 using the compensation voltage acquisition circuit 30, and the compensation voltage acquisition circuit 30 provided by the embodiment of the present disclosure is combined with FIG. 4A, FIG. 4B and FIG. Specific instructions.
  • the compensation voltage acquisition circuit 30 may include a brightness detection circuit 3 and a signal comparison circuit.
  • the brightness detecting circuit 3 may be configured to detect the brightness of the light emitting device 1 to acquire a light sensitive signal corresponding to the brightness of the light emitting device 1.
  • the photosensitive signal may be a voltage signal or a current signal, which is not specifically limited in the embodiment of the present disclosure.
  • the signal comparison circuit can be configured to compare the photosensitive signal with a reference signal to obtain a compensation voltage.
  • the signal comparison circuit can obtain the compensation voltage by comparing the voltage or comparing the current, which is not specifically limited in the embodiment of the present disclosure.
  • the reference signal may be a light-sensing signal acquired by the brightness detecting circuit 3 in the case where the brightness of the light-emitting device 1 is the target brightness, but the embodiment of the present disclosure is not limited thereto.
  • the display device including the pixel circuit 100 needs to display different images in different display frames, the target luminance of the light-emitting device 1 is constantly changed with time, so that the reference signal is constantly changed.
  • the specifics of the brightness detection circuit 3 and the signal comparison circuit may be set according to actual application requirements, and the embodiment of the present disclosure does not specifically limit this.
  • the pixel circuit 100 provided by the embodiment of the present disclosure is specifically described below by taking the signal comparison circuit as the voltage comparison circuit 4 as an example, but the embodiment of the present disclosure is not limited thereto.
  • FIG. 5A is an exemplary structural diagram of a compensation voltage acquisition circuit 30 provided by Embodiment 2 of the present disclosure.
  • the compensation voltage acquisition circuit 30 includes a voltage comparison circuit 4 and a brightness detection circuit 3.
  • the brightness detecting circuit 3 can be implemented as the circuit diagram shown in FIG. 5B.
  • the brightness detecting circuit 3 may include a photosensitive element 31 and a first resistor R1.
  • the photosensitive element 31 is configured to convert light incident on the photosensitive element 31 into a photosensitive current signal
  • the photosensitive element 31 may be, for example, a photodiode (PN junction) or a transistor, but embodiments of the present disclosure are not limited thereto as long as the photosensitive element 31 can convert an optical signal incident thereon into an electrical signal (for example, a current signal).
  • the first resistor R1 is configured to convert the photosensitive current signal into a photosensitive voltage signal, and the specific form of the first resistor R1 can be set according to actual application requirements, which is not specifically limited in the embodiment of the present disclosure.
  • the first resistor R1 may be connected in parallel with the photosensitive element 31.
  • the voltage difference V 0 -V gr across the first resistor R1 is proportional to the current output by the photosensitive element 31, that is, the first resistor.
  • the voltage difference V 0 -V gr across R1 is proportional to the intensity of the light incident on the photosensitive element 31 (i.e., the brightness of the light-emitting device 1).
  • one end of the brightness detecting circuit 3 (for example, one end corresponding to the positive electrode of the photosensitive element 31) may be configured as an output end, and the other end of the brightness detecting circuit 3 (for example, one end corresponding to the negative electrode of the photosensitive element 31) may be connected to a constant
  • the voltage source V gr , the constant voltage source V gr may provide a voltage of 0 volts (that is, the other end of the brightness detecting circuit 3 is grounded), but embodiments of the present disclosure are not limited thereto. Therefore, the brightness detecting circuit 3 shown in FIG. 5B can detect the brightness of the light emitting device 1 and can acquire the light sensing signal V 0 corresponding to the brightness of the light emitting device 1.
  • the manner in which the first resistor R1 and the photosensitive element 31 are connected is not limited to the parallel connection.
  • the first resistor R1 may be connected in series with the photosensitive element 31 according to actual application requirements, which is not specifically limited in the embodiment of the present disclosure.
  • the voltage comparison circuit 4 can include a first input, a second input, and a signal output.
  • the first input can be configured to receive a reference voltage signal.
  • the second input can be electrically coupled to the brightness detection circuit 3 and can be configured to receive a photosensitive voltage signal.
  • the signal output can be configured to output a compensation voltage that is obtained based on the reference voltage signal and the photosensitive voltage signal.
  • the specific setting manner of the voltage comparison circuit 4 can be set according to actual application requirements, and the embodiment of the present disclosure does not specifically limit this.
  • the voltage comparison circuit 4 can be embodied as the circuit diagram shown in FIG. 5C.
  • the voltage comparison circuit 4 may include a sixth transistor Q6, a seventh transistor Q7, an eighth transistor Q8, a second resistor R2, and a third node 73.
  • the first end of the sixth transistor Q6 may be electrically connected to the first high voltage source V H1
  • the second end of the sixth transistor Q6 may be electrically connected to the third node 73
  • the control end of the sixth transistor Q6 may receive the reference voltage V Ref .
  • the first end of the seventh transistor Q7 may be electrically connected to the third node 73
  • the second end of the seventh transistor Q7 may be electrically connected to the first low voltage source V L1
  • the control end of the seventh transistor Q7 may receive the photosensitive voltage V 0
  • the first end of the eighth transistor Q8 may be electrically connected to the second high voltage source V H2
  • the second end of the eighth transistor Q8 may be electrically connected to the first end of the second resistor R2 and the output signal line of the voltage comparison circuit 4
  • the control terminal of the eighth transistor Q8 can be electrically connected to the third node 73.
  • the second end of the second resistor R2 may be electrically connected to the second low voltage source V L2 , and the voltage of the second low voltage source may be, for example, 0 V (that is, the second end of the second resistor R2 is grounded).
  • the voltage value of the first high voltage source V H1 may be higher than the voltage value of the first low voltage source V L1
  • the voltage value of the second high voltage source V H2 may be higher than the voltage value of the second low voltage source V L2 .
  • the voltage value of the first high voltage source V H1 , the voltage value of the first low voltage source V L1 , the voltage value of the second high voltage source V H2 , and the voltage value of the second low voltage source V L2 may be set according to actual application requirements, and the present disclosure The embodiment does not specifically limit this.
  • V 0 -V L1 V Ref -V out1 ;
  • V 1 I ds ⁇ R 2 +V L2
  • the voltages of the first high voltage source V H1 , the second high voltage source V H2 , the first low voltage source V L1 , and the second low voltage source V L2 may be preset, and the threshold V th of the eighth transistor Q8 may be measured in advance.
  • V L1 -V H2 -V th and V L2 can be set to zero according to actual application requirements.
  • the compensation voltage V 1 outputted by the voltage comparison circuit 4 satisfies the following formula:
  • the specific values of the eighth transistor Q8 and the second resistor R2 may be set according to actual application requirements, and the embodiment of the present disclosure does not specifically limit this, as long as the obtained compensation voltage V 1 can be made to the light emitting device 1 .
  • the light-emitting circuit compensates (for example, the brightness of the compensated light-emitting device is the target brightness).
  • the compensation voltage V 1 output from the voltage comparison circuit 4 is 0.
  • the compensation voltage V 1 output by the voltage comparison circuit 4 is r (V Ref - V 0 )
  • the compensation voltage V 1 can be supplied to the drive circuit 2 to achieve compensation (for example, real-time compensation) of the luminance of the light-emitting device 1 (ie, the illumination intensity of the light-emitting device 1).
  • the pixel circuit 100 provided by the embodiment of the present disclosure may further include a compensation control circuit 5 according to actual application requirements.
  • the compensation control circuit 5 can be configured to provide a compensation voltage to the drive circuit 2.
  • the specific form of the compensation control circuit 5 can be set according to actual application requirements, and the embodiment of the present disclosure does not specifically limit this.
  • the compensation control circuit 5 can be embodied as the circuit shown in FIG. 4A.
  • the compensation control circuit 5 may include an initial voltage supply circuit 51 and a compensation voltage supply circuit 52.
  • the initial voltage supply circuit 51 may be configured to provide an initial voltage to the drive circuit 2; the compensation voltage supply circuit 52 may be configured to provide a compensation voltage to the drive circuit 2.
  • the specific form of the initial voltage supply circuit 51 and the compensation voltage supply circuit 52 may be set according to actual application requirements, which is not specifically limited in the embodiment of the present disclosure.
  • the pixel circuit 100 further includes a second node 72.
  • the second end of the first capacitor C1 is configured to be electrically connected to the second node 72.
  • the initial voltage supply circuit 51 may include a fourth transistor Q4.
  • the first terminal of the fourth transistor Q4 is electrically connected to the third power terminal VD1, and the third power terminal VD1 can provide a constant voltage, and the voltage value of the constant voltage VD1 can be, for example, 0 volts (see FIG. 4B), but Embodiments of the present disclosure are not limited thereto.
  • the control terminal of the fourth transistor Q4 may be electrically connected to a scan line (eg, a gate line).
  • a scan line eg, a gate line
  • the scan line electrically connected to the control terminal of the fourth transistor Q4 and the scan line electrically connected to the control terminal of the first transistor Q1 may be the same scan line, thereby simplifying the pixel provided in this embodiment.
  • Circuit 100 but embodiments of the present disclosure are not limited thereto.
  • the second end of the fourth transistor Q4 is configured to be electrically connected to the second node 72.
  • the control terminal of the fourth transistor Q4 receives an on signal (for example, a low level signal), for example, the voltage VD1 supplied from the third power terminal VD1 can be written to the second node 72, that is, the first The second end of the capacitor C1.
  • the control terminal of the fourth transistor Q4 and the control terminal of the first transistor Q1 can simultaneously receive the on signal.
  • the basic data signal for example, V Data
  • the signal line Data and the third power supply terminal VD1 are provided.
  • the voltage VD1 can be written to the first end and the second end of the first capacitor C1, respectively, so that the voltage difference across the first capacitor C1 is V Data -VD1, and the voltage difference V Data -VD1 will be stored in the first capacitor C1.
  • V Data the voltage difference stored across the first capacitor C1 is V Data .
  • the compensation control circuit 5 provided by the embodiment of the present disclosure is specifically described below by taking the third power supply terminal VD1 as an example, but the embodiment of the present disclosure is not limited thereto.
  • the compensation voltage supply circuit 52 may include a fifth transistor Q5.
  • the first terminal of the fifth transistor Q5 is electrically coupled to the second node 72, and the second terminal of the fifth transistor Q5 is electrically coupled to the output of the signal comparison circuit.
  • the control terminal of the fifth transistor Q5 may be electrically connected to the compensation control line S2.
  • the compensation voltage V 1 of the output of the signal comparison circuit can be supplied to the drive circuit 2 via the turned-on fifth transistor Q5 and the first capacitor C1.
  • FIG. 6 is an exemplary driving timing diagram of the pixel circuit shown in FIG. 4B.
  • one driving period of the pixel circuit 100 (for example, the driving period may correspond to one display period of the display device including the pixel circuit 100, that is, display time corresponding to one frame of image) includes a charging phase A and a compensation lighting phase. B.
  • the scan line can provide, for example, a low level
  • the light-emission control line S1 and the compensation control line S2 can, for example, provide a high level.
  • the first transistor Q1 and the fourth transistor Q4 are turned on, and the third transistor is turned on.
  • Q3 and the fifth transistor Q5 are turned off.
  • the voltage of the first terminal of the fourth transistor Q4 can be written to the second terminal of the first capacitor C1 via the turned-on fourth transistor Q4, and the first capacitor is grounded when the first terminal of the fourth transistor Q4 is grounded.
  • the second terminal voltage of C1 is 0; the voltage V Data provided by the signal line can be written to the first node 71 via the turned-on first transistor Q1 (ie, the first terminal of the first capacitor C1 and the control terminal of the second transistor Q2) At this time, the voltage difference across the first capacitor C1 is V Data , and the voltage difference V Data is stored in the first capacitor C1.
  • the third transistor Q3 may also be in an on state, whereby the pixel circuit 100 can acquire the compensation voltage in the charging phase A.
  • the scan line can for example provide a high level, illumination control line S1
  • the compensation control line S2 can, for example, provide a low level, at which time the first transistor Q1 and the fourth transistor Q4 are turned off, and the third transistor Q3 and the fifth transistor Q5 are turned on.
  • the driving electric signal for example, the driving current signal
  • the driving current is The size determines the brightness of the light-emitting device 1.
  • the compensation voltage acquisition circuit 30 may acquire a compensation voltage based on the luminance of the light emitting device 1 and supply the compensation voltage to the second end of the fifth transistor Q5.
  • the compensation voltage acquisition circuit 30 outputs offset voltage may be written via the fifth transistor Q5 is turned to a second terminal of the first capacitor C1, and due to a bootstrap effect of the capacitor, the voltage V 1 is the compensation can be written as the increment
  • the first terminal of the first capacitor C1 is entered (that is, the voltage of the first terminal of the compensated first capacitor C1 is V Data + V 1 ).
  • the compensation control circuit 5 writes the compensation voltage V 1 as an increment to the first end of the first capacitor C1 as an increment to the first end of the first capacitor C1 will be specifically described below. For example, since the first end of the first capacitor C1 is in a floating state during the compensation lighting phase B, the amount of charge stored in the first capacitor C1 cannot be abruptly changed, that is, the amount of charge stored in the first capacitor C1 remains unchanged.
  • the voltage difference across the first capacitor C1 remains unchanged; since the voltage of the second terminal of the first capacitor C1 is increased from 0V to V 1, so the first end of the first capacitor C1 is the voltage can be increased from V Data to V Data + V 1, further compensation control circuit 5 may be used as the compensation voltage V 1 is a first terminal of the first capacitor C1 (i.e., the second transistor Q2 is written into the control increment end).
  • the pixel circuit 100 provided by the present embodiment can acquire a light-receiving voltage corresponding to the brightness of the light-emitting device 1 based on the brightness of the light-emitting device 1, and can supply the light-sensitive voltage to the control terminal of the second transistor Q2, for example, as an increment. Therefore, the degree of conduction of the second transistor Q2 can be controlled and adjusted, and thus the magnitude of the driving current supplied from the driving circuit 2 to the light emitting device 1 can be adjusted, whereby the brightness of the light emitting device 1 can be adjusted (for example, the light emitting device 1 can be illuminated) The brightness is adjusted to the target brightness).
  • the pixel circuit 100 provided in this embodiment can acquire the compensation voltage in the compensation illumination phase B and provide the acquired compensation voltage to the drive circuit 2.
  • the compensation voltage can also be acquired in the charging phase A and the obtained compensation voltage can be supplied to the driving circuit 2.
  • the frequency of the compensation of the brightness of the light-emitting device 1 by the pixel circuit 100 provided in this embodiment may be set according to actual application requirements, which is not specifically limited in the embodiment of the present disclosure.
  • the pixel circuit 100 provided in this embodiment can compensate the brightness of the light-emitting device 1 in real time during the compensation illumination phase of each driving cycle (or display period); for example, the pixel circuit 100 provided in this embodiment can also be used in each driving.
  • the compensated illumination phase of the period compensates the luminance of the light-emitting device 1 once; for example, the pixel circuit 100 provided in this embodiment can also compensate the luminance of the light-emitting device 1 once every predetermined drive period (for example, 20 drive cycles).
  • the pixel circuit 100 provided in this embodiment implements a brightness compensation function.
  • the transistors used in Embodiment 1 and other embodiments of the present disclosure may be thin film transistors (for example, polysilicon thin film transistors, amorphous silicon thin film transistors, oxide thin film transistors or organic thin film transistors) or field effect transistors or Other switching devices with the same characteristics.
  • the source and drain of the transistor used here can be symmetrical in structure, so the source and drain of the transistor can be physically indistinguishable.
  • the first end of all or part of the transistor in the embodiment of the present disclosure is The second end is interchangeable as needed.
  • the first end of the transistor of the embodiment of the present disclosure may be a source, and the second end may be a drain; or the first end of the transistor is a drain and the second end is a source.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the embodiment provides a method for driving a pixel circuit, and the driving method of the pixel circuit can be applied to any of the pixel circuits provided by the embodiments of the present disclosure.
  • the driving method of the pixel circuit may include the following steps:
  • Step S100 driving the light emitting device to emit light
  • Step S200 Obtain a compensation voltage based on the brightness of the light emitting device, and the compensation voltage is supplied to the driving circuit.
  • the method for driving the illumination of the illuminating device can be referred to the embodiment of the pixel circuit, and details are not described herein again.
  • acquiring the compensation voltage based on the brightness of the light emitting device may include the following steps:
  • Step S210 detecting brightness of the light emitting device to obtain a light sensing signal corresponding to the brightness of the light emitting device;
  • Step S220 comparing the photosensitive signal with the reference signal to obtain a compensation voltage.
  • the photosensitive signal corresponding to the luminance of the light emitting device acquired by detecting the luminance of the light emitting device may be V 0 .
  • the compensation voltage V 1 r (V Ref - V 0 ) obtained by comparing the photosensitive signal V 0 with the reference signal V Ref , r is a compensation coefficient.
  • a method of detecting the brightness of the light-emitting device and obtaining the compensation voltage V 1 can be referred to the embodiment of the pixel circuit, and details are not described herein again.
  • the driving method of the pixel circuit may further include: controlling whether to provide an electrical signal output by the driving circuit to the light emitting device.
  • controlling whether to provide an electrical signal output by the driving circuit to the light emitting device can be referred to the embodiment of the pixel circuit, and details are not described herein again.
  • the driving method of the pixel circuit may further include: providing a compensation voltage to the driving circuit.
  • the specific method for providing the compensation voltage to the driving circuit can be referred to the embodiment of the pixel circuit, and details are not described herein again.
  • the driving method of the pixel circuit can acquire the light-receiving voltage corresponding to the brightness of the light-emitting device based on the brightness of the light-emitting device, and provide the light-sensitive voltage to the driving circuit, for example, as an increment, the driving circuit can be adjusted.
  • the magnitude of the drive current to the light emitting device whereby the brightness of the light emitting device can be adjusted (for example, the brightness of the light emitting device can be adjusted in real time).
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the present embodiment provides a display panel, which may include any of the pixel circuits provided by the embodiments of the present disclosure.
  • the present embodiment further provides a display device, which may include any one of the pixel circuits provided by the embodiments of the present disclosure or the display panel of any one of the embodiments of the present disclosure.
  • the display device may be any product or component having a display function such as an electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • Embodiments of the present disclosure provide a pixel circuit and a driving method thereof, a display panel, and a display device, which implement a brightness compensation function.

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Abstract

一种像素电路（100）及其驱动方法、显示面板和显示装置。该像素电路（100）包括发光器件(1)、驱动电路(2)和补偿电压获取电路(30)。驱动电路(2)配置为驱动发光器件(1)发光；补偿电压获取电路(30)配置为基于发光器件(1)的亮度获取补偿电压，补偿电压可提供给驱动电路(2)。该像素电路（100）及其驱动方法、显示面板和显示装置实现了亮度补偿功能。

Description

像素电路及其驱动方法、显示面板和显示装置 技术领域
本公开的实施例涉及一种像素电路及其驱动方法、显示面板和显示装置。
背景技术
有机发光二极管(Organic Light Emitting Diode，OLED)显示器件由于具有视角宽、对比度高、响应速度快以及相比于无机发光显示器件可以具有更高的发光亮度、更低的驱动电压等优势而逐渐受到人们的广泛关注。OLED显示器件包括阵列排布的有机发光二极管，有机发光二极管例如可以在薄膜晶体管输出的驱动电流的驱动下发光。
发明内容
本公开的至少一个实施例提供了一种像素电路，该像素电路包括发光器件、驱动电路、亮度检测电路、电压比较电路和补偿控制电路。驱动电路配置为驱动所述发光器件发光；亮度检测电路配置为检测所述发光器件亮度，并根据所述发光器件的亮度获取对应于所述发光器件的亮度的感光电压；电压比较电路配置为将所述感光电压与参考电压进行比较以获取补偿电压，所述参考电压为所述发光器件的亮度为目标亮度的情况下所述亮度检测电路获取的感光电压；补偿控制电路配置为将所述补偿电压提供给所述驱动电路。
例如，在本公开至少一个实施例提供的一种像素电路中，所述驱动电路与第一电源端、所述补偿控制电路和所述发光器件电连接；所述补偿控制电路与所述电压比较电路的输出端电连接；所述亮度检测电路与所述电压比较电路的输入端电连接；所述发光器件的第二端与第二电源端连接。
例如，在本公开至少一个实施例提供的一种像素电路中，所述像素电路还包括发光控制电路，所述发光控制电路配置为控制是否使得所述发光器件发光。
例如，在本公开至少一个实施例提供的一种像素电路中，所述驱动电路包括第一晶体管、第二晶体管和第一电容；所述第一晶体管的控制端连接扫 描线，所述第一晶体管的第一端连接信号线，所述第一晶体管的第二端连接所述第二晶体管的控制端和所述第一电容的第一端；所述第二晶体管的第一端连接所述第一电源端，所述第二晶体管的第二端连接所述发光器件或所述发光控制电路；所述第一电容的第二端连接所述补偿控制电路。
例如，在本公开至少一个实施例提供的一种像素电路中，所述发光控制电路包括第三晶体管，所述第三晶体管的控制端连接发光控制线，所述第三晶体管的第一端连接第二晶体管的第二端，所述第三晶体管的第二端连接所述发光器件的第一端。
例如，在本公开至少一个实施例提供的一种像素电路中，所述补偿控制电路包括第四晶体管和第五晶体管；所述第四晶体管的控制端连接所述扫描线，所述第四晶体管的第一端连接第一电容的第二端和第五晶体管的第二端，所述第四晶体管的第二端接地；所述第五晶体管的控制端连接补偿控制线，所述第五晶体管的第一端连接所述电压比较电路，所述第五晶体管的第二端连接第一电容的第二端。
例如，在本公开至少一个实施例提供的一种像素电路中，所述亮度检测电路包括感光元件与所述感光元件并联的电阻，所述感光元件的第一端连接电压比较电路的输入端，所述感光元件的第二端接地。
例如，在本公开至少一个实施例提供的一种像素电路中，所述发光器件为有机发光二极管。
本公开的至少一个实施例还提供了一种显示面板，该显示面板包括上述的像素电路。
本公开的至少一个实施例还提供了一种显示装置，该显示装置包括上述的像素电路或上述的显示面板。
本公开的至少一个实施例还提供了一种像素电路的驱动方法，该像素电路的驱动方法包括：驱动发光器件发光；检测所述发光器件的亮度，并根据所述发光器件的亮度获取对应于所述发光器件的亮度的感光电压；将所述感光电压与参考电压进行比较以获取补偿电压，其中，所述参考电压为所述发光器件的亮度为目标亮度的情况下获取的感光电压；将所述补偿电压提供给驱动电路。
例如，在本公开至少一个实施例提供的一种像素电路的驱动方法中，对 应于所述发光器件的亮度的所述感光电压值为V0，参考电压值为VRef，提供给所述驱动电路的所述补偿电压值为V1，V1＝r(VRef-V0)，r为补偿系数。
本公开的至少一个实施例还提供了一种像素电路，该像素电路包括发光器件、驱动电路和补偿电压获取电路。所述驱动电路配置为驱动所述发光器件发光；所述补偿电压获取电路配置为基于所述发光器件的亮度获取补偿电压，所述补偿电压被提供给所述驱动电路。
例如，本公开至少一个实施例提供的一种像素电路还包括补偿控制电路，所述补偿控制电路配置为将所述补偿电压提供给所述驱动电路。
例如，本公开至少一个实施例提供的一种像素电路还包括发光控制电路，所述发光控制电路配置为控制是否使得所述发光器件发光。
例如，在本公开至少一个实施例提供的一种像素电路中，所述发光控制电路与所述驱动电路和所述发光器件电连接，且配置为控制是否将所述驱动电路输出的电信号提供给所述发光器件。
例如，在本公开至少一个实施例提供的一种像素电路中，所述发光器件的第一端与所述发光控制电路或所述驱动电路电连接，所述发光器件的第二端与所述第二电源端电连接。
例如，在本公开至少一个实施例提供的一种像素电路中，所述驱动电路包括驱动元件、发光选择电路和第一电容。驱动元件配置为可驱动所述发光器件发光；发光选择电路配置为可将基础数据信号写入到所述驱动元件的控制端；第一电容配置为可将所述基础数据信号保持在所述驱动元件的控制端。
例如，在本公开至少一个实施例提供的一种像素电路中，所述驱动电路还包括第一节点；所述发光选择电路包括第一晶体管，所述第一晶体管的第一端配置为电连接到所述信号线，所述第一晶体管的第二端配置为电连接到所述第一节点；所述驱动元件包括第二晶体管，所述第二晶体管的第一端配置为电连接到第一电源端，所述第二晶体管的第二端配置为电连接到所述发光器件或所述发光控制电路；所述第一电容的第一端配置为电连接到所述第一节点，所述第一电容的第二端配置为电连接到所述补偿控制电路。
例如，在本公开至少一个实施例提供的一种像素电路中，所述补偿电压获取电路包括亮度检测电路和信号比较电路。亮度检测电路配置为检测所述发光器件的亮度，以获取对应于所述发光器件的亮度的感光信号；信号比较 电路配置为将所述感光信号与参考信号进行对比，以获取所述补偿电压。
例如，在本公开至少一个实施例提供的一种像素电路中，所述亮度检测电路包括感光元件和第一电阻，所述感光元件配置为将入射到所述感光元件上的光线转换为感光电流信号，所述第一电阻配置为将所述感光电流信号转换为感光电压信号；所述信号比较电路包括第一输入端、第二输入端和信号输出端，所述第一输入端配置为接收参考电压信号，所述第二输入端配置接收所述感光电压信号，所述信号输出端配置为输出基于所述参考电压信号和所述感光电压信号获取的所述补偿电压。
例如，在本公开至少一个实施例提供的一种像素电路中，所述信号比较电路为电压比较电路，所述电压比较电路包括第六晶体管、第七晶体管、第八晶体管、第二电阻和第三节点；所述第六晶体管的第一端配置为电连接到第一高压源，所述第六晶体管的第二端配置为电连接到所述第三节点，所述第六晶体管的控制端配置为所述第一输入端；所述第七晶体管的第一端配置为电连接到所述第三节点，所述第七晶体管的第二端配置为电连接到第一低压源VL1，所述第七晶体管的控制端配置为所述第二输入端；所述第八晶体管的第一端配置为电连接到第二高压源，所述第八晶体管的第二端配置为所述信号输出端，所述第八晶体管的控制端配置为电连接到所述第三节点；所述第二电阻的第一端配置为电连接到所述第八晶体管的第二端，所述第二电阻的第二端配置为电连接到第二低压源；所述第一高压源的电压值大于所述第一低压源的电压值，所述第二高压源的电压值大于所述第二低压源的电压值。
例如，在本公开至少一个实施例提供的一种像素电路中，所述补偿控制电路包括初始电压提供电路和补偿电压提供电路：初始电压提供电路配置为将初始电压提供给所述驱动电路；补偿电压提供电路配置为将所述补偿电压提供给所述驱动电路。
例如，在本公开至少一个实施例提供的一种像素电路中，所述像素电路还包括第二节点，所述第一电容的第二端配置为电连接到所述第二节点；所述初始电压提供电路包括第四晶体管，所述第四晶体管的第一端电连接到第三电源端，所述第四晶体管的第二端电连接到所述第二节点；所述补偿电压提供电路包括第五晶体管，所述第五晶体管的第一端电连接到所述第二节点， 所述第五晶体管的第二端电连接到所述信号比较电路的输出端。
本公开的至少一个实施例还提供了一种像素电路的驱动方法，该像素电路的驱动方法包括：驱动发光器件发光；基于所述发光器件的亮度获取补偿电压；所述补偿电压被提供给驱动电路。
例如，在本公开至少一个实施例提供的一种像素电路的驱动方法中，还包括：将所述补偿电压提供给所述驱动电路。
例如，在本公开至少一个实施例提供的一种像素电路的驱动方法中，还包括：控制是否将所述驱动电路输出的电信号提供给所述发光器件。
例如，在本公开至少一个实施例提供的一种像素电路的驱动方法中，基于所述发光器件的亮度获取补偿电压包括：检测所述发光器件的亮度，以获取对应于所述发光器件的亮度的感光信号；将所述感光信号与参考信号进行对比，以获取所述补偿电压。
本公开的实施例提供一种像素电路及其驱动方法、显示面板和显示装置，实现了亮度补偿功能。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例或相关技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，并非对本公开的限制。
图1是一种像素电路的结构示意图；
图2是本公开实施例一提供的一种像素电路的结构示意图；
图3A是本公开实施例二提供的一种像素电路的示例性框图；
图3B是图3A所示的像素电路的一种示例性结构图；
图4A是图3A所示的像素电路的一种示例性电路图；
图4B是图4A所示的像素电路的电路图一种具体实现方式；
图5A是本公开实施例二提供的补偿电压获取电路的一种示例性结构图；
图5B是本公开实施例二提供的亮度检测电路的示例性电路图；
图5C是本公开实施例二提供的电压比较电路的示例性电路图；以及
图6是本公开图4B所示的像素电路的一种示例性的驱动时序图。
附图标记
C—存储电容；1—发光器件；2—驱动电路；3—亮度检测电路；4—电压比较电路；5—补偿控制电路；6—发光控制电路；21—驱动元件；22—发光选择电路；30—补偿电压获取电路；31-感光元件；51—初始电压提供电路；52-补偿电压提供电路；71—第一节点；72—第二节点；73—第三节点；C1—第一电容；R1—第一电阻；R2—第二电阻；Q1—第一晶体管；Q2—第二晶体管；Q3—第三晶体管；Q4—第四晶体管；Q5—第五晶体管；Q6—第六晶体管；Q7—第七晶体管；Q8—第八晶体管；S1—发光控制线；S2—补偿控制线；VDD—第一电源端；VSS—第二电源端；VD1—第三电源端。
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。
除非另外定义，本公开使用的技术术语或者科学术语应当为本发明所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”、“一”或者“该”等类似词语也不表示数量限制，而是表示存在至少一个。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
例如，图1为一种像素电路的结构示意图，图1所示的像素电路为2T1C电路，也即，利用两个TFT(Thin-film transistor，薄膜晶体管)和一个存储电容(C)来实现驱动发光元件EL(例如，OLED)发光的基本功能。
例如，如图1所示，2T1C型像素电路可以包括第一晶体管Q1(即，选择晶体管)、第二晶体管Q2(即，驱动晶体管)以及存储电容C。例如，该 第一晶体管Q1的控制端可以接收扫描信号，第一晶体管Q1的第一端可以电连接到信号线Data以接收数据信号，第一晶体管Q1的第二端可以电连接到第二晶体管Q2的控制端。例如，第二晶体管Q2的第一端可以电连接到第一电源端VDD，例如，第一电源端VDD可以为电压源以输出恒定的正电压，也可以为电流源等；第二晶体管Q2的第二端可以电连接到发光元件EL的第一端(例如，OLED的正极端)。例如，存储电容C的第一端电连接到第二晶体管Q2的第一端以及第一电源端VDD；存储电容C的第二端电连接到第一晶体管Q1的第二端以及第二晶体管Q2的控制端；发光元件EL的第二端(例如，OLED的负极端)电连接到第二电源端VSS，例如，第二电源端VSS可以为接地端。
例如，该2T1C像素电路的驱动方式是将像素的明暗(灰阶)经由两个TFT和存储电容C来控制。在通过扫描线施加扫描信号以导通第一晶体管Q1情况下，数据驱动电路通过信号线送入的数据电压经由第一晶体管Q1对存储电容C充电，由此将数据电压存储在存储电容C中，且该存储的数据电压控制第二晶体管Q2的导通程度，由此控制流过第二晶体管Q2以及驱动发光元件EL(例如，OLED)发光的电流大小，即此电流决定该像素发光的灰阶。
发明人注意到像素电路的工作温度或者发光元件EL或/和晶体管(例如，第二晶体管Q2)的老化程度等因素会影响流过第二晶体管Q2以及驱动发光元件EL(例如，OLED)发光的电流大小，因此使得像素电路的发光亮度偏离预定的亮度数值(例如，高于或低于预定的亮度数值)，并由此导致显示图像的质量劣化，进而影响了用户的使用体验。
例如，按照晶体管的特性区分可以将晶体管分为N型和P型晶体管，为了清楚起见，本公开的实施例以晶体管为P型晶体管为例详细阐述了本公开的技术方案，然而本公开的实施例的晶体管不限于P型晶体管，本领域技术人员还可以根据实际需要利用N型晶体管实现本公开中的实施例中的一个或多个晶体管。这些晶体管例如为薄膜晶体管。
本公开的至少一个实施例提供了一种像素电路，该像素电路包括发光器件、驱动电路和补偿电压获取电路。驱动电路配置为驱动发光器件发光；补偿电压获取电路配置为基于发光器件的亮度获取补偿电压，补偿电压被提供给驱动电路。
本公开的至少一个实施例还提供了一种显示面板，该显示面板包括上述的像素电路。本公开的至少一个实施例还提供了一种显示装置，该显示装置包括上述的像素电路或上述的显示面板。
本公开的至少一个实施例还提供了一种像素电路的驱动方法，该像素电路的驱动方法包括：驱动发光器件发光；基于发光器件的亮度获取补偿电压，补偿电压被提供给驱动电路。
下面通过几个实施例对根据本公开实施例的像素电路及其驱动方法和显示装置进行非限制性的说明，如下面所描述的，在不相互抵触的情况下这些具体实施例中不同特征可以相互组合，从而得到新的实施例，这些实施例也都属于本公开保护的范围。
实施例一：
本实施例提供一种像素电路，如图2所示，该像素电路可以包括：发光器件1、驱动电路2、亮度检测电路3、电压比较电路4和补偿控制电路5。驱动电路2用于驱动发光器件1发光；亮度检测电路3用于检测发光器件1的亮度，并根据所述发光器件1的亮度获取对应于发光器件1的亮度的感光电压；电压比较电路4配置为将感光电压与参考电压进行比较以获取补偿电压，此处，参考电压为发光器件的亮度为目标亮度情况下亮度检测电路获取的感光电压；补偿控制电路5配置为将补偿电压提供给驱动电路2。
例如，在本实施例的像素电路设置的亮度检测电路3、电压比较电路4、补偿控制电路5中，例如，亮度检测电路3可以将入射到其上的光线转化为感光电压并提供给电压比较电路4，然后电压比较电路4可以将感光电压与参考电压进行比较，并可以获取一个补偿电压，该补偿控制电路5将补偿电压提供给驱动电路2，驱动电路2可以根据补偿电压调整(例如，实时调整)提供给发光器件1的电流，从而可以调整发光器件1发光亮度(例如，可以将发光器件1发光亮度调整为目标亮度)，由此可以防止发光器件1(例如，OLED)的发光亮度偏离目标亮度值，并因此可以提升包括该像素电路的显示装置的显示质量。
实施例二：
本实施例提供了一种像素电路，该像素电路100例如可应用于显示面板，例如OLED显示面板等。例如，图3A是本公开实施例二提供的一种像素电路100的示例性框图，图3B是图3A所示的像素电路100的一种示例性结构 图。
例如，如图3A所示，该像素电路100可以包括发光器件1、驱动电路2和补偿电压获取电路30。例如，驱动电路2可以配置为驱动发光器件1发光；补偿电压获取电路30可以配置为基于发光器件1的亮度获取补偿电压，该补偿电压可提供给驱动电路2。
例如，根据实际应用需求，该像素电路100可以包括发光控制电路6(参见图3B)。例如，发光控制电路配置为控制是否使得所述发光器件发光。例如，发光控制电路的具体设定位置可以根据实际应用需求进行设定，本公开的实施例对此不做具体限定。例如，发光控制电路6可以与驱动电路2或/和发光器件1电连接。例如，发光控制电路6可以设置在驱动电路2与第一电源端VDD之间。又例如，发光控制电路6还可以设置在发光器件1与第二电源端VSS之间。再例如，发光控制电路6还可以设置在驱动电路2和发光器件1之间。由此，发光控制电路6可配置为控制是否使得发光器件发光，发光控制电路6例如可通过控制是否将驱动电路2输出的电信号(例如，电流信号)提供给发光器件1来控制发光器件1是否发光。例如，下面将以发光控制电路6设置在驱动电路2和发光器件1之间为例对本公开的实施例做具体说明，但本公开的实施例不限于此。
例如，发光器件1、驱动电路2、补偿电压获取电路30和发光控制电路6的具体形式可以根据实际应用需求进行设定，本公开的实施例对此不做具体限定。例如，本公开实施例二提供的像素电路100可以实现为如图4A所示的电路。例如，图4B是图4A所示的像素电路100的电路图一种具体实现方式，但图4A所示的电路不限于图4B所示的具体实现方式。
例如，发光器件1可以为LED(Light Emitting Diode，发光二极管)或OLED(Organic Light Emitting Diode，有机发光二极管)等电流驱动型发光器件1，但本公开的实施例不限于此。例如，本公开的实施例以发光器件1为OLED为例对本公开的技术方案进行说明，但本公开的发光器件1不限于OLED。例如，如图4A所示，发光器件1的第二端(例如，阴极端)可以与第二电源端VSS连接。例如，第二电源端VSS可以输出恒定的电压，第二电源端VSS例如可以接地，但本公开的实施例不限于此。
例如，如图4A所示，驱动电路2可以包括驱动元件21、发光选择电路22和第一电容C1。例如，如图4A所示，驱动元件21配置为可驱动发光器 件1发光。例如，发光选择电路22配置为可将基础数据信号写入到驱动元件21的控制端。例如，第一电容C1配置为可将基础数据信号保持在驱动元件21的控制端。例如，驱动元件21、发光选择电路22和第一电容C1的具体形式可以根据实际应用需求进行设定，本公开的实施例对此不做具体限定。
例如，如图4A所示，驱动电路2还可以包括第一节点71。例如，如图4A所示，发光选择电路22可以包括第一晶体管Q1。例如，第一晶体管Q1的第一端配置为电连接到信号线Data，第一晶体管Q1的第二端配置为电连接到第一节点71；第一晶体管Q1的控制端配置为电连接到扫描线，扫描线例如可以是栅线(例如，图4B所示的栅线Gate)。例如，如图4B所示，第一晶体管Q1的导通和截止可以由扫描线提供的信号(例如，导通信号或截止信号)进行控制。
例如，如图4A所示，驱动元件21可以包括第二晶体管Q2。例如，第二晶体管Q2的第一端配置为电连接到第一电源端VDD，第一电源端VDD例如可以输出恒定的电压，第一电源端VDD输出的电压例如可以大于第二电源端VSS，但本公开的实施例不限于此。例如，第二晶体管Q2的第二端配置为电连接到发光器件1或发光控制电路6；例如，在像素电路100还包括发光控制电路6的情况下，第二晶体管Q2的第二端配置为电连接到发光控制电路6；又例如，在像素电路100不包括发光控制电路6的情况下，第二晶体管Q2的第二端配置为电连接到发光器件1。例如，第二晶体管Q2的控制端配置为电连接到第一节点71。例如，如图4A所示，第一电容C1的第一端配置为电连接到第一节点71，第一电容C1的第二端配置为电连接到补偿控制电路5。
例如，如图4A所示，在第一晶体管Q1的控制端接收到导通信号(例如，低电平信号)的情况下，信号线Data提供的基础数据信号(例如，VData)可以经由导通的第一晶体管Q1写入到第一节点71(也即，驱动元件21的控制端和第一电容C1的第一端)。例如，第一电容C1配置为可将该基础数据信号保持在驱动元件21的控制端，并可根据实际需求使得驱动元件21处于导通状态。例如，第二晶体管Q2的控制端的电压(例如，VData)可以控制第二晶体管Q2的导通程度，并因此可以控制驱动电路2提供给发光器件1的驱动电流的大小，进而决定该发光器件1的亮度以及该像素电路100发光的灰阶。
例如，如图4A和图4B所示，在像素电路100包括发光控制电路6的情况下，发光控制电路6可以包括第三晶体管Q3。例如，第三晶体管Q3的第二端可以与发光器件1的第一端(例如，阳极端)电连接；第三晶体管Q3的第一端可以与驱动电路2的输出端(即，第二晶体管Q2的第二端电连接)。例如，如图4B所示，第三晶体管Q3的导通和截止可以由发光控制线S1提供的信号进行控制。例如，在发光控制电路6接收到导通信号(例如，低电平信号)的情况下，驱动电路2输出的电信号(例如，电流信号)可以经由导通的发光控制电路6提供给发光器件1，并使得发光器件1发光；在第三晶体管Q3截止时，则不会有驱动电流流过发光器件1，因此发光器件1也不会发光。
例如，下面以像素电路100包括发光控制电路6为例对本实施例的技术方案进行说明，但本实施例的像素电路100还可以不包括发光控制电路6，此时发光器件1的第一端可以直接与驱动电路2的输出端电连接。
例如，本公开实施例提供的像素电路100可以基于发光器件1的亮度、使用补偿电压获取电路30获取补偿电压，下面结合图4A、4B和图5对本公开实施例提供的补偿电压获取电路30做具体说明。
例如，补偿电压获取电路30可以包括亮度检测电路3和信号比较电路。例如，如图4A和图4B所示，亮度检测电路3可以配置为检测发光器件1的亮度，以获取对应于发光器件1的亮度的感光信号。例如，该感光信号可以为电压信号或电流信号，本公开的实施例对此不做具体限定。例如，信号比较电路可以配置为将感光信号与参考信号进行对比，以获取补偿电压。例如，信号比较电路可以通过比较电压或比较电流的方式获取补偿电压，本公开的实施例对此不做具体限定。
例如，参考信号可以是发光器件1的亮度为目标亮度的情况下亮度检测电路3获取的感光信号，但本公开的实施例不限于此。例如，由于包含该像素电路100的显示器件需要在不同的显示帧显示不同的图像，因此使得发光器件1的目标亮度随时间不断变化，进而使得参考信号随之不断变化。
例如，亮度检测电路3和信号比较电路具体形式可以根据实际应用需求进行设定，本公开的实施例对此不做具体限定。例如，下面以信号比较电路为电压比较电路4为例对本公开实施例提供的像素电路100进行具体说明，但本公开的实施例不限于此。
例如，图5A是本公开实施例二提供的补偿电压获取电路30的一种示例性结构图。例如，如图5A所示，补偿电压获取电路30包括电压比较电路4和亮度检测电路3。
例如，亮度检测电路3可实现为图5B示出的电路图。例如，如图5B所示，亮度检测电路3可以包括感光元件31和第一电阻R1。例如，感光元件31配置为将入射到感光元件31上的光线转换为感光电流信号，感光元件31例如可以为光敏二极管(PN结)或者晶体管，但本公开的实施例不限于此，只要感光元件31可以将入射到其上的光信号转换为电信号(例如，电流信号)即可。例如，第一电阻R1配置为将感光电流信号转换为感光电压信号，第一电阻R1的具体形式可以根据实际应用需求进行设定，本公开的实施例对此不做具体限定。
例如，如图5B所示，第一电阻R1可以与感光元件31并联，此时第一电阻R1两端的电压差V0-Vgr与感光元件31输出的电流成正比，也即，第一电阻R1两端的电压差V0-Vgr与入射到感光元件31上的光线的强度(即，发光器件1的亮度)成正比。例如，亮度检测电路3的一端(例如，对应于感光元件31正极的一端)可以配置为输出端，亮度检测电路3的另一端(例如，对应于感光元件31负极的一端)可以连接至恒定的电压源Vgr，该恒定的电压源Vgr提供的电压可以为0伏(也即，亮度检测电路3的另一端接地)，但本公开的实施例不限于此。因此，图5B示出的亮度检测电路3可以检测发光器件1的亮度，并且可以获取对应于发光器件1的亮度的感光信号V0。例如，第一电阻R1与感光元件31的连接方式不限于并联，根据实际应用需求，第一电阻R1例如还可以与感光元件31串联，本公开的实施例对此不做具体限定。
例如，如图5A所示，该电压比较电路4可以包括第一输入端、第二输入端和信号输出端。例如，第一输入端可以配置为接收参考电压信号。例如，第二输入端可以与亮度检测电路3电连接，并且可以配置为接收感光电压信号。例如，信号输出端可以配置为输出基于参考电压信号和感光电压信号获取的补偿电压。
例如，电压比较电路4的具体设置方式可以根据实际应用需求进行设定，本公开的实施例对此不做具体限定。例如，电压比较电路4具体可实现为图5C示出的电路图。
例如，如图5C所示，电压比较电路4可以包括第六晶体管Q6、第七晶体管Q7、第八晶体管Q8、第二电阻R2和第三节点73。例如，第六晶体管Q6的第一端可以电连接到第一高压源VH1，第六晶体管Q6的第二端可以电连接到第三节点73，第六晶体管Q6的控制端可以接收参考电压VRef。例如，第七晶体管Q7的第一端可以电连接到第三节点73，第七晶体管Q7的第二端可以电连接到第一低压源VL1，第七晶体管Q7的控制端可以接收感光电压V0。例如，第八晶体管Q8的第一端可以电连接到第二高压源VH2，第八晶体管Q8的第二端可以电连接到第二电阻R2的第一端以及电压比较电路4的输出信号线、第八晶体管Q8的控制端可以电连接到第三节点73。例如，第二电阻R2的第二端可以电连接到第二低压源VL2，第二低压源的电压例如可以为0V(也即，第二电阻R2的第二端接地)。例如，第一高压源VH1的电压值可以高于第一低压源VL1电压值，第二高压源VH2的电压值可以高于第二低压源VL2电压值。例如，第一高压源VH1的电压值、第一低压源VL1电压值、第二高压源VH2的电压值和第二低压源VL2电压值可以根据实际应用需求进行设定，本公开的实施例对此不做具体限定。
例如，根据晶体管特性可以得到以下公式：
V0-VL1＝VRef-Vout1；
V1＝Ids×R2+VL2
＝1/2×K×R2(Vgs-Vth)2+VL2
＝1/2×K×R2(Vout1-VH2-Vth)2+VL2
＝1/2×K×R2(VRef-V0+VL1-VH2-Vth)2+VL2
这里，Ids为第八晶体管Q8处于饱和状态下输出的电流；K＝W/L×C×u，W/L为第八晶体管Q8的沟道的宽长比(即，宽度与长度的比值)，u为电子迁移率，C为单位面积的电容，Vth为第八晶体管Q8的阈值。
例如，第一高压源VH1、第二高压源VH2、第一低压源VL1和第二低压源VL2的电压可以预先设定，第八晶体管Q8的阈值Vth可以提前测定。例如，可以根据实际应用需求、将VL1-VH2-Vth和VL2分别设定为零。此时，电压比较电路4输出的补偿电压V1满足以下公式：
V1＝r(VRef-V0)，r为补偿系数，且r＝1/2×K×R2。
例如，第八晶体管Q8和第二电阻R2的具体数值可以根据实际应用需求进行设定，本公开的实施例对此不做具体限定，只要可以使得获取的补偿电 压V1可以对发光器件1的发光电路进行补偿(例如，使得补偿后的发光器件的亮度为目标亮度)即可。
例如，在亮度检测电路3输出的感光电压信号V0与参考电压VRef相等的情况下(也即，发光器件1的亮度为目标亮度)，电压比较电路4输出的补偿电压V1＝0。例如，在亮度检测电路3输出的感光电压信号V0与参考电压VRef不相等的情况下(也即，发光器件1的亮度不等于目标亮度)，电压比较电路4输出的补偿电压V1＝r(VRef-V0)，补偿电压V1可提供给驱动电路2，以实现发光器件1的亮度(即，发光器件1的发光强度)的补偿(例如，实时补偿)。
例如，根据实际应用需求，本公开实施例提供的像素电路100还可以包括补偿控制电路5。例如，补偿控制电路5可以配置为将补偿电压提供给驱动电路2。例如，补偿控制电路5的具体形式可以根据实际应用需求进行设定，本公开的实施例对此不做具体限定。例如，补偿控制电路5可以具体实现为图4A所示的电路。
例如，下面将结合图4A和图4B对本公开提供的补偿控制电路5进行具体说明。例如，如图4A所示，该补偿控制电路5可以包括初始电压提供电路51和补偿电压提供电路52。例如，初始电压提供电路51可以配置为将初始电压提供给驱动电路2；补偿电压提供电路52可以配置为将补偿电压提供给驱动电路2。例如，初始电压提供电路51和补偿电压提供电路52的具体形式可以根据实际应用需求进行设定，本公开的实施例对此不做具体限定。
例如，如图4A所示，像素电路100还包括第二节点72。例如，第一电容C1的第二端配置为电连接到第二节点72。
例如，如图4A所示，初始电压提供电路51可以包括第四晶体管Q4。例如，第四晶体管Q4的第一端电连接到第三电源端VD1，第三电源端VD1可以提供恒定的电压，该恒定的电压VD1的电压值例如可以为0伏(参见图4B)，但本公开的实施例不限于此。例如，第四晶体管Q4的控制端可以电连接到扫描线(例如，栅线)。例如，如图4B所示，第四晶体管Q4的控制端电连接的扫描线以及第一晶体管Q1的控制端电连接的扫描线可以为同一根扫描线，由此可以简化本实施例提供的像素电路100，但本公开的实施例不限于此。例如，第四晶体管Q4的第二端配置为电连接到第二节点72。
例如，在第四晶体管Q4的控制端接收到导通信号(例如，低电平信号) 的情况下，第三电源端VD1提供的例如电压VD1可以写入到第二节点72，也即第一电容C1的第二端。例如，第四晶体管Q4的控制端和第一晶体管Q1的控制端可以同时接收到导通信号，此时，信号线Data提供的基础数据信号(例如，VData)和第三电源端VD1提供的例如电压VD1可以分别写入第一电容C1的第一端和第二端，因此，第一电容C1两端的电压差为VData-VD1，并且该电压差VData-VD1将保存在第一电容C1中。例如，如图4B所示，在第三电源端VD1接地的情况下(VD1＝0)，保存在第一电容C1两端的电压差为VData。例如，下面以第三电源端VD1接地作为示例对本公开实施例提供的补偿控制电路5进行具体说明，但本公开的实施例不限于此。
例如，如图4A所示，补偿电压提供电路52可以包括第五晶体管Q5。例如，如图4A所示，第五晶体管Q5的第一端电连接到第二节点72，第五晶体管Q5的第二端电连接到信号比较电路的输出端。例如，如图4B所示，第五晶体管Q5的控制端可以电连接到补偿控制线S2。例如，在第五晶体管Q5导通的情况下，信号比较电路的输出的补偿电压V1可以经由导通的第五晶体管Q5以及第一电容C1提供给驱动电路2。
例如，下面将结合图4B和图6对本公开实施例提供的补偿控制电路5的电压补偿功能进行示例性的说明。例如，图6是图4B所示的像素电路的一种示例性的驱动时序图。例如，像素电路100的一个驱动周期(例如，该驱动周期可以对应于包含该像素电路100的显示器件的一个显示周期，也即对应于一帧图像的显示时间)包括充电阶段A和补偿发光阶段B。
例如，在充电阶段A，扫描线例如可以提供低电平、发光控制线S1和补偿控制线S2例如可以提供高电平，此时，第一晶体管Q1和第四晶体管Q4导通，第三晶体管Q3和第五晶体管Q5截止。例如，第四晶体管Q4的第一端的电压可以经由导通的第四晶体管Q4写入到第一电容C1的第二端，在第四晶体管Q4的第一端接地的情况下，第一电容C1第二端电压为0；信号线提供的电压VData可以经由导通的第一晶体管Q1写入到第一节点71(即，第一电容C1第一端和第二晶体管Q2的控制端)，此时，第一电容C1两端的电压差为VData，并且该电压差VData保存在第一电容C1中。例如，根据实际应用需求，在充电阶段A，第三晶体管Q3也可以处于导通状态，由此像素电路100在充电阶段A即可获取补偿电压。
例如，补偿发光阶段B，扫描线例如可以提供高电平、发光控制线S1 和补偿控制线S2例如可以提供低电平，此时，第一晶体管Q1和第四晶体管Q4截止、第三晶体管Q3和第五晶体管Q5导通。
例如，补偿发光阶段B，由于第三晶体管Q3导通，因此第二晶体管Q2输出的驱动电信号(例如，驱动电流信号)可以经由导通的第三晶体管Q3提供给发光器件1，并且驱动电流的大小决定者发光器件1的亮度。例如，补偿电压获取电路30可以基于所述发光器件1的亮度获取补偿电压，并将该补偿电压提供给第五晶体管Q5的第二端。
例如，补偿电压获取电路30输出的补偿电压可以经由导通的第五晶体管Q5写入到第一电容C1的第二端，并且由于电容的自举效应，该补偿电压V1可以作为增量写入到第一电容C1的第一端(也即，补偿后的第一电容C1的第一端的电压为VData+V1)。
例如，下面具体说明补偿控制电路5如何将补偿电压V1作为增量写入到第一电容C1的第一端。例如，由于在补偿发光阶段B，第一电容C1的第一端处于浮置状态，因此第一电容C1中存储的电荷量无法发生突变，也即，第一电容C1中存储的电荷量保持不变；对应的，根据电容电荷守恒原理，第一电容C1两端的电压差也保持不变；由于第一电容C1的第二端的电压由0V增加至V1，因此第一电容C1的第一端的电压可以由VData增加至VData+V1，进而补偿控制电路5可以将补偿电压V1可以作为增量写入到第一电容C1的第一端(也即，第二晶体管Q2的控制端)。
例如，由于本实施例提供的像素电路100可以基于发光器件1的亮度获取对应于发光器件1的亮度的感光电压，并将该感光电压例如可以作为增量提供给第二晶体管Q2的控制端，因此可以控制和调整第二晶体管Q2的导通程度，并因此可以调整驱动电路2提供给发光器件1的驱动电流的大小，由此可以调节发光器件1的亮度(例如，可以将发光器件1发光亮度调整为目标亮度)。
例如，本实施例提供的像素电路100可以在补偿发光阶段B获取补偿电压并将所获取的补偿电压提供给驱动电路2。又例如，在第三晶体管Q3在充电阶段A也处于导通状态的情况下，还可以在充电阶段A获取补偿电压并将所获取的补偿电压提供给驱动电路2。
例如，本实施例提供的像素电路100对发光器件1的亮度的补偿频率可以根据实际应用需求进行设定，本公开的实施例对此不做具体限定。例如， 本实施例提供的像素电路100可以在每个驱动周期(或显示周期)的补偿发光阶段对发光器件1的亮度进行实时补偿；又例如，本实施例提供的像素电路100还可以在每个驱动周期的补偿发光阶段对发光器件1的亮度补偿一次；再例如，本实施例提供的像素电路100还可以在每隔预定的驱动周期(例如20个驱动周期)对发光器件1的亮度补偿一次。
例如，本实施例提供的像素电路100实现了亮度补偿功能。
需要说明的是，本公开的实施例一和其它实施例中采用的晶体管可以为薄膜晶体管(例如，多晶硅薄膜晶体管、非晶硅薄膜晶体管、氧化物薄膜晶体管或有机薄膜晶体管)或场效应晶体管或其他特性相同的开关器件。这里采用的晶体管的源极、漏极在结构上可以是对称的，所以其源极、漏极在物理结构上可以是没有区别的。在本公开的实施例中，为了区分晶体管除作为控制端的栅极，直接描述了其中一极为第一端，另一极为第二端，所以本公开实施例中全部或部分晶体管的第一端和第二端根据需要是可以互换的。例如，本公开实施例的晶体管的第一端可以为源极，第二端可以为漏极；或者，晶体管的第一端为漏极，第二端为源极。
实施例三：
本实施例提供一种像素电路的驱动方法，该像素电路的驱动方法可应用于本公开实施例提供的任一像素电路中。例如，该像素电路的驱动方法可以包括以下步骤：
步骤S100：驱动发光器件发光；
步骤S200：基于发光器件的亮度获取补偿电压，补偿电压被提供给驱动电路。
例如，驱动发光器件发光的方法可以参见像素电路的实施例，在此不再赘述。
例如，在S200中，基于发光器件的亮度获取补偿电压可以包括以下步骤：
步骤S210：检测发光器件的亮度，以获取对应于发光器件的亮度的感光信号；
步骤S220：将感光信号与参考信号进行对比，以获取补偿电压。
例如，在步骤S210中，检测发光器件的亮度获取的对应于发光器件的亮度的感光信号可以为V0。例如，在步骤S220，将感光信号V0与参考信号 VRef进行对比获取的补偿电压V1＝r(VRef-V0)，r为补偿系数。例如，检测发光器件的亮度以及获取补偿电压V1的方法可以参见像素电路的实施例，在此不再赘述。
例如，根据实际应用需求，该像素电路的驱动方法还可以包括：控制是否将驱动电路输出的电信号提供给发光器件。例如，控制是否将驱动电路输出的电信号提供给发光器件的具体方法可以参见像素电路的实施例，在此不再赘述。
例如，根据实际应用需求，该像素电路的驱动方法还可以包括：将补偿电压提供给驱动电路。例如，将补偿电压提供给驱动电路的具体方法可以参见像素电路的实施例，在此不再赘述。
例如，由于本实施例提供的像素电路的驱动方法可以基于发光器件的亮度获取对应于发光器件的亮度的感光电压，并将该感光电压例如作为增量提供给驱动电路，因此可以调整驱动电路提供给发光器件的驱动电流的大小，由此可以调节发光器件的亮度(例如，可以实时调节发光器件的亮度)。
实施例四：
本实施例提供了一种显示面板，该显示面板可以包括本公开实施例提供的任意一种像素电路。本实施例还提供了一种显示装置，该显示装置可以包括本公开实施例提供的任意一种像素电路或者本公开实施例提供的任意一种的显示面板。例如，该显示装置可以为：电子纸、OLED面板、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
需要说明的是，对于该显示面板和显示装置的其它必不可少的组成部分(例如控制装置、图像数据编码/解码装置、行扫描驱动器、列扫描驱动器、时钟电路等)均为本领域的普通技术人员应该理解具有的，在此不做赘述，也不应作为对本公开实施例的限制。
本公开的实施例提供一种像素电路及其驱动方法、显示面板和显示装置，实现了亮度补偿功能。
显然，本领域的技术人员可以对本公开的实施例进行各种改动、变型、组合而不脱离本公开的精神和范围。这样，倘若本公开的实施例的这些修改、变型、组合属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。
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2016年12月27日递交的中国专利申请第201611227008.7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 (20)

  1. 一种像素电路，包括：
    发光器件；
    驱动电路，配置为驱动所述发光器件发光；
    亮度检测电路，配置为检测所述发光器件的亮度，并根据所述发光器件的亮度获取对应于所述发光器件的亮度的感光电压；
    电压比较电路，配置为将所述感光电压与参考电压进行比较以获取补偿电压，其中，所述参考电压为所述发光器件的亮度为目标亮度的情况下所述亮度检测电路获取的感光电压；
    补偿控制电路，配置为将所述补偿电压提供给所述驱动电路。
  2. 根据权利要求1所述的像素电路，其中，所述驱动电路与第一电源端、所述补偿控制电路和所述发光器件电连接；
    所述补偿控制电路与所述电压比较电路的输出端电连接；
    所述亮度检测电路与所述电压比较电路的输入端电连接；
    所述发光器件的第二端与第二电源端连接。
  3. 根据权利要求2所述的像素电路，还包括发光控制电路，其中，所述发光控制电路配置为控制是否使得所述发光器件发光。
  4. 根据权利要求3所述的像素电路，其中，所述驱动电路包括第一晶体管、第二晶体管和第一电容；
    所述第一晶体管的控制端连接扫描线，所述第一晶体管的第一端连接信号线，所述第一晶体管的第二端连接所述第二晶体管的控制端和所述第一电容的第一端；
    所述第二晶体管的第一端连接所述第一电源端，所述第二晶体管的第二端连接所述发光器件或所述发光控制电路；
    所述第一电容的第二端连接所述补偿控制电路。
  5. 根据权利要求4所述的像素电路，其中，所述发光控制电路包括第三晶体管，所述第三晶体管的控制端连接发光控制线，所述第三晶体管的第一端连接第二晶体管的第二端，所述第三晶体管的第二端连接所述发光器件的第一端。
  6. 根据权利要求4所述的像素电路，其中，所述补偿控制电路包括第四 晶体管和第五晶体管；
    所述第四晶体管的控制端连接所述扫描线，所述第四晶体管的第二端连接第一电容的第二端和第五晶体管的第一端，所述第四晶体管的第一端接地；
    所述第五晶体管的控制端连接补偿控制线，所述第五晶体管的第二端连接所述电压比较电路，所述第五晶体管的第一端连接第一电容的第二端。
  7. 根据权利要求1所述的像素电路，其中，所述亮度检测电路包括感光元件和与所述感光元件并联的电阻，所述感光元件的第一端连接电压比较电路的输入端，所述感光元件的第二端接地。
  8. 一种显示面板，包括如权利要求1-7任一所述的像素电路。
  9. 一种显示装置，包括如权利要求1-7任一所述的像素电路或如权利要求8所述的显示面板。
  10. 一种如权利要求1的像素电路的驱动方法，包括：
    驱动发光器件发光；
    检测所述发光器件的亮度，并根据所述发光器件的亮度获取对应于所述发光器件的亮度的感光电压；
    将所述感光电压与参考电压进行比较以获取补偿电压，其中，所述参考电压为所述发光器件的亮度为目标亮度的情况下获取的感光电压；
    将所述补偿电压提供给驱动电路。
  11. 根据权利要求10所述的像素电路的驱动方法，其中，
    对应于所述发光器件的亮度的所述感光电压值为V0，参考电压值为VRef，提供给所述驱动电路的所述补偿电压值为V1，V1＝r(VRef-V0)，r为补偿系数。
  12. 一种像素电路，包括：
    发光器件；
    驱动电路，配置为驱动所述发光器件发光；
    补偿电压获取电路，配置为基于所述发光器件的亮度获取补偿电压，所述补偿电压被提供给所述驱动电路。
  13. 根据权利要求12所述的像素电路，还包括补偿控制电路，其中，
    所述补偿控制电路配置为将所述补偿电压提供给所述驱动电路。
  14. 根据权利要求13所述的像素电路，还包括发光控制电路，其中，
    所述发光控制电路配置为控制是否使得所述发光器件发光。
  15. 根据权利要求14所述的像素电路，其中，所述驱动电路包括：
    驱动元件，配置为可驱动所述发光器件发光；
    发光选择电路，配置为可将基础数据信号写入到所述驱动元件的控制端；
    第一电容，配置为可将所述基础数据信号保持在所述驱动元件的控制端。
  16. 根据权利要求15所述的像素电路，其中，
    所述驱动电路还包括第一节点；
    所述发光选择电路包括第一晶体管，所述第一晶体管的第一端配置为电连接到所述信号线，所述第一晶体管的第二端配置为电连接到所述第一节点；
    所述驱动元件包括第二晶体管，所述第二晶体管的第一端配置为电连接到第一电源端，所述第二晶体管的第二端配置为电连接到所述发光器件或所述发光控制电路；
    所述第一电容的第一端配置为电连接到所述第一节点，所述第一电容的第二端配置为电连接到所述补偿控制电路。
  17. 根据权利要求16所述的像素电路，其中，所述补偿电压获取电路包括：
    亮度检测电路，配置为检测所述发光器件的亮度，以获取对应于所述发光器件的亮度的感光信号；
    信号比较电路，配置为将所述感光信号与参考信号进行对比，以获取所述补偿电压。
  18. 根据权利要求17所述的像素电路，其中，
    所述亮度检测电路包括感光元件和第一电阻，所述感光元件配置为将入射到所述感光元件上的光线转换为感光电流信号，所述第一电阻配置为将所述感光电流信号转换为感光电压信号；
    所述信号比较电路包括第一输入端、第二输入端和信号输出端，所述第一输入端配置为接收参考电压信号，所述第二输入端配置为接收所述感光电压信号，所述信号输出端配置为输出基于所述参考电压信号和所述感光电压信号获取的所述补偿电压。
  19. 根据权利要求18所述的像素电路，其中，所述补偿控制电路包括：
    初始电压提供电路，配置为将初始电压提供给所述驱动电路；
    补偿电压提供电路，配置为将所述补偿电压提供给所述驱动电路。
  20. 根据权利要求19所述的像素电路，其中，所述像素电路还包括第二 节点，其中，
    所述第一电容的第二端配置为电连接到所述第二节点；
    所述初始电压提供电路包括第四晶体管，所述第四晶体管的第一端电连接到第三电源端，所述第四晶体管的第二端电连接到所述第二节点；
    所述补偿电压提供电路包括第五晶体管，所述第五晶体管的第一端电连接到所述第二节点，所述第五晶体管的第二端电连接到所述信号比较电路的输出端。
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106782319B (zh) * 2016-12-27 2023-10-24 京东方科技集团股份有限公司 一种像素电路、像素驱动方法、显示装置
CN107591122B (zh) 2017-09-27 2019-08-30 深圳市华星光电半导体显示技术有限公司 一种oled电压补偿方法及补偿电路、显示装置
CN108520718B (zh) * 2018-04-18 2019-12-27 京东方科技集团股份有限公司 一种显示装置的像素数据补偿方法及装置、显示装置
CN110459172B (zh) * 2018-05-08 2020-06-09 京东方科技集团股份有限公司 一种像素驱动电路及驱动方法、显示装置
CN108447443B (zh) 2018-05-14 2020-01-21 京东方科技集团股份有限公司 像素电路及驱动方法、显示装置
CN108665855A (zh) * 2018-07-18 2018-10-16 深圳市华星光电技术有限公司 Amoled显示面板的驱动系统及amoled显示面板
CN108877660B (zh) * 2018-08-06 2020-11-27 京东方科技集团股份有限公司 一种驱动电路、显示装置和显示装置的驱动方法
CN109272940B (zh) * 2018-11-15 2020-08-07 京东方科技集团股份有限公司 像素驱动电路及其驱动方法、显示基板
CN112102771B (zh) * 2019-06-17 2022-02-25 京东方科技集团股份有限公司 像素电路、驱动方法和显示装置
DE102019125364A1 (de) * 2019-09-20 2021-03-25 OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung Anordnung und verfahren zum betreiben eines diodenarrays
TWI718776B (zh) * 2019-11-21 2021-02-11 友達光電股份有限公司 發光模組及其補償方法
US11632830B2 (en) * 2020-08-07 2023-04-18 Samsung Display Co., Ltd. System and method for transistor parameter estimation
CN112735328A (zh) * 2021-01-18 2021-04-30 季华实验室 驱动电路、像素结构、及自动调节亮度的led显示面板
CN114005405A (zh) * 2021-10-19 2022-02-01 惠州华星光电显示有限公司 显示面板及其亮度补偿方法
CN114863879B (zh) * 2022-05-23 2023-05-02 惠科股份有限公司 有机发光二极管控制电路及显示面板

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104900186A (zh) * 2015-06-15 2015-09-09 京东方科技集团股份有限公司 Oled像素电路及其显示装置
US20150348464A1 (en) * 2014-05-29 2015-12-03 Samsung Display Co., Ltd. Pixel circuit and electroluminescent display including the same
CN105679245A (zh) * 2016-03-31 2016-06-15 上海天马有机发光显示技术有限公司 一种像素补偿电路及像素结构
US20160267839A1 (en) * 2013-11-25 2016-09-15 Samsung Display Co., Ltd. Pixel circuit for increasing accuracy of current sensing
CN205648068U (zh) * 2016-02-05 2016-10-12 昆山龙腾光电有限公司 一种led日光灯亮度调整系统
CN106782319A (zh) * 2016-12-27 2017-05-31 京东方科技集团股份有限公司 一种像素电路、像素驱动方法、显示装置
CN206301581U (zh) * 2016-12-27 2017-07-04 京东方科技集团股份有限公司 一种像素电路、显示装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060007204A1 (en) * 2004-06-29 2006-01-12 Damoder Reddy System and method for a long-life luminance feedback stabilized display panel
JP4770906B2 (ja) * 2008-10-07 2011-09-14 ソニー株式会社 表示装置
JP5277926B2 (ja) * 2008-12-15 2013-08-28 ソニー株式会社 表示装置及びその駆動方法と電子機器
JP5636657B2 (ja) * 2009-09-25 2014-12-10 ソニー株式会社 表示装置
CN102314833A (zh) * 2010-07-07 2012-01-11 周锡卫 基于pn结群组的广域光电智能传感器及显示屏调光系统与方法
CN102622960A (zh) * 2012-03-16 2012-08-01 中国科学院西安光学精密机械研究所 Led显示装置的亮度调节装置、led显示系统及其制作方法
CN104157237B (zh) * 2014-07-18 2016-05-11 京东方科技集团股份有限公司 一种显示驱动电路及其驱动方法、显示装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160267839A1 (en) * 2013-11-25 2016-09-15 Samsung Display Co., Ltd. Pixel circuit for increasing accuracy of current sensing
US20150348464A1 (en) * 2014-05-29 2015-12-03 Samsung Display Co., Ltd. Pixel circuit and electroluminescent display including the same
CN104900186A (zh) * 2015-06-15 2015-09-09 京东方科技集团股份有限公司 Oled像素电路及其显示装置
CN205648068U (zh) * 2016-02-05 2016-10-12 昆山龙腾光电有限公司 一种led日光灯亮度调整系统
CN105679245A (zh) * 2016-03-31 2016-06-15 上海天马有机发光显示技术有限公司 一种像素补偿电路及像素结构
CN106782319A (zh) * 2016-12-27 2017-05-31 京东方科技集团股份有限公司 一种像素电路、像素驱动方法、显示装置
CN206301581U (zh) * 2016-12-27 2017-07-04 京东方科技集团股份有限公司 一种像素电路、显示装置

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