WO2015176420A1 - Pixel circuit, driving method thereof and display device thereof - Google Patents

Pixel circuit, driving method thereof and display device thereof Download PDF

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Publication number
WO2015176420A1
WO2015176420A1 PCT/CN2014/086311 CN2014086311W WO2015176420A1 WO 2015176420 A1 WO2015176420 A1 WO 2015176420A1 CN 2014086311 W CN2014086311 W CN 2014086311W WO 2015176420 A1 WO2015176420 A1 WO 2015176420A1
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Prior art keywords
module
compensation
emitting device
driving voltage
voltage
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PCT/CN2014/086311
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French (fr)
Chinese (zh)
Inventor
王颖
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京东方科技集团股份有限公司
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Publication of WO2015176420A1 publication Critical patent/WO2015176420A1/en

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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]

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and a display device.
  • the luminance of the OLED device is proportional to the driving current and exponentially related to the driving voltage; in the state of low gray scale display Under the IGBT device, the driving voltage has a significant influence on the change of its illuminance.
  • the electrical performance of OLED devices is attenuated with increasing use time. The voltage drop of OLED devices will increase during use, that is, as the use time increases, OLED devices are used when driving OLED devices with the same driving voltage. The brightness of the image is lowered, resulting in uneven display brightness, which affects the display of the entire image.
  • the OLED device belongs to a current driving device, and requires a stable current to control the light emission.
  • the threshold voltage Vth of the driving transistor of the pixel circuit is uneven, which causes the flow to flow.
  • the current of the OLED at each pixel changes to make the display brightness uneven, which also affects the display of the entire image.
  • a pixel circuit having an internal compensation function includes a driving transistor T1, a switching transistor T2, an input control circuit module, a capacitor C, and an OLED device.
  • the internal compensation circuit can be used to make the driving voltage for driving the light emitting device to be related only to the data signal voltage input at the data signal end, irrespective of the threshold voltage of the driving transistor, and the threshold voltage can be avoided for the light emitting device.
  • the effect cannot eliminate the phenomenon that the voltage drop of the OLED device will increase during use, making the display brightness uneven, affecting the display effect of the entire image.
  • the embodiment of the present invention provides a pixel circuit, a driving method thereof, and a display device, which are used to solve the problem that the brightness of the display panel is uneven due to the decrease of the brightness of the light-emitting device. question.
  • An embodiment of the present invention provides a pixel circuit, including a light emitting device and a driving module for providing a driving voltage for the light emitting device, further comprising: a sampling module, a compensation module, and a processing module;
  • An input end of the sampling module is connected to an output end of the driving module, and the sampling module is configured to sample a driving voltage provided by the driving module;
  • An input end of the processing module is connected to an output end of the sampling module, the processing module is configured to use a driving voltage sampled according to the sampling module, and a pre-stored brightness of the light emitting device according to a usage time Determining a corresponding voltage with a corresponding voltage to determine a compensation voltage corresponding to the driving voltage;
  • An input end of the compensation module is connected to an output end of the processing module, and the compensation module is configured to input a compensation voltage determined by the processing module to the light emitting device.
  • the sampling module samples the driving voltage
  • the processing module processes according to the driving voltage sampled by the sampling module, and the pre-stored light emitting device.
  • the brightness of the light-emitting brightness is matched with the driving voltage according to the change of the use time, and the compensation voltage corresponding to the driving voltage is obtained, and the compensation module inputs the compensation voltage determined by the processing module to the corresponding light-emitting device, thereby realizing the use time of the light-emitting device.
  • the sampling module includes: a first thin film transistor and a second thin film transistor;
  • the gate of the first thin film transistor is electrically connected to the sampling signal control end, and the sampling signal control end is configured to control the sampling module to be in an on state during a sampling period;
  • a drain of the first thin film transistor is electrically connected to a source of the second thin film transistor and an output end of the driving module
  • a source of the first thin film transistor is electrically connected to a gate of the second thin film transistor
  • the drain of the second thin film transistor is electrically connected to the input end of the processing module.
  • the compensation module includes: a third thin film transistor and a fourth thin film transistor: wherein
  • the gate of the third thin film transistor is electrically connected to the compensation signal control end, and the compensation signal control end is configured to control the compensation module to be in an on state during the compensation period;
  • a drain of the third thin film transistor is electrically connected to a source of the fourth thin film transistor and an output end of the processing module;
  • the third thin film transistor source is electrically connected to the gate of the fourth thin film transistor
  • the drain of the fourth thin film transistor is electrically connected to the input end of the light emitting device.
  • the input end and the output end of the processing module are the same port; the sampling signal control end or the compensation signal control end is time-sharing The sampling module or the compensation module corresponding to the driving is in an on state.
  • the foregoing pixel circuit provided by the embodiment of the present invention further includes: connecting between an output end of the sampling module and an input end of the processing module, and connected to the compensation module a cache module between the input end and the output end of the processing module; the cache module is configured to buffer a driving voltage signal sampled by the sampling module or a compensation voltage signal determined by the processing module.
  • the cache module includes a capacitor, one end of the capacitor is grounded, and the other end is connected to an output end of the sampling module and the processing module. Between the inputs and between the input of the compensation module and the output of the processing module.
  • the processing module includes:
  • An analog-to-digital conversion unit configured to convert an analog signal of a driving voltage sampled by the sampling module into a corresponding digital signal
  • a storage unit configured to store a correspondence between a change in the light-emitting brightness of the light-emitting device that is established in advance and a driving voltage according to a change in use time
  • a determining unit configured to determine, according to the digital signal converted by the analog-to-digital conversion unit, and the pre-stored light-emitting luminance of the light-emitting device, corresponding to a change in usage time and a driving voltage, to determine a corresponding to the driving voltage Digital signal of the compensation voltage;
  • a digital-to-analog conversion unit configured to convert the digital signal of the compensation voltage determined by the determining unit into a corresponding analog signal.
  • An embodiment of the present invention provides a display device, including any of the above pixel circuits provided by the embodiments of the present invention.
  • Embodiments of the present invention provide a driving method of a pixel circuit, including:
  • the sampling module samples the driving voltage, and inputs the sampled driving voltage to the processing module under the control of the sampling signal control end;
  • the processing module determines the compensation voltage corresponding to the driving voltage according to the driving voltage sampled by the sampling module and the pre-stored brightness of the light-emitting device, and the corresponding relationship between the driving time and the driving voltage. And inputting the compensation voltage to the compensation module;
  • the compensation module inputs the compensation voltage determined by the processing module to the light emitting device under the control of the compensation signal control terminal.
  • the processing module is configured according to the driving voltage sampled by the sampling module, and the pre-stored brightness of the light emitting device.
  • the compensation voltage corresponding to the driving voltage is determined according to the corresponding relationship between the change of the use time and the driving voltage, and specifically includes:
  • An analog-to-digital conversion unit in the processing module converts an analog signal of a driving voltage sampled by the sampling module into a corresponding digital signal
  • the digital-to-analog conversion unit in the processing module converts the digital signal of the compensation voltage determined by the determining unit into a corresponding analog signal.
  • FIG. 1 is a schematic structural view of a pixel circuit using internal compensation in the prior art
  • FIG. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention.
  • FIG. 4 is a timing chart of operation of a sampling signal control end and a compensation signal control end in a pixel circuit according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of an analog-to-digital conversion circuit according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a digital-to-analog conversion circuit according to an embodiment of the present invention.
  • FIG. 7 is a corresponding relationship diagram between light emission luminance and driving voltage of a light emitting device according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present invention.
  • a pixel circuit as shown in FIG. 2, includes a light emitting device 01 and a driving module 02 for providing a driving voltage for the light emitting device, and further includes: a sampling module 03, a compensation module 04, and a processing module 05. ;among them,
  • sampling module 03 The input end of the sampling module 03 is connected to the output end of the driving module 02, and the sampling module 03 is used to sample the driving voltage provided by the driving module 02;
  • the input end of the processing module 05 is connected to the output end of the sampling module 03.
  • the processing module 05 is configured to determine and drive according to the driving voltage sampled by the sampling module 03 and the corresponding relationship between the brightness of the light-emitting device 01 and the driving voltage stored in advance.
  • the input of the compensation module 04 is connected to the output of the processing module 05, and the compensation module 04 is used to input the compensation voltage determined by the processing module 05 to the light-emitting device.
  • the driving module 02 provides a driving voltage for the light emitting device 01, and when the driving module 02 inputs a driving voltage to the light emitting device 01, the sampling module 03 samples the driving voltage, and The sampled driving voltage is output to the processing module 05; the processing module 05 processes the sampling voltage, determines a compensation voltage corresponding to the driving voltage, and outputs the compensation voltage to the compensation module 04; the compensation module 04 determines the compensation voltage determined by the processing module 05. Input to the light emitting device 01.
  • the sampling module 03 samples the driving voltage
  • the processing module 05 processes according to the driving voltage sampled by the sampling module 03
  • the pre-stored light-emitting luminance of the light-emitting device 01 is a compensation voltage corresponding to the driving voltage according to the corresponding relationship between the change of the use time and the driving voltage
  • the compensation module 04 inputs the compensation voltage determined by the processing module 05 to the corresponding light-emitting device.
  • the display 01 which realizes different compensation functions for the driving voltage of the light emitting device 01 according to the use time of the light emitting device 01, and avoids the occurrence of the light emitting device 01 when the light emitting device 01 is driven by the same driving voltage as the use time of the light emitting device 01 increases.
  • the brightness of the light-emitting device is lowered, and the display brightness of the display panel is uneven, which improves the uniformity of display brightness of the display panel.
  • the driving mode is The block 02 can be the same as the prior art, and adopts an internal compensation circuit, and specifically includes: an input control module, a capacitor Cst, a driving transistor DTFT, and a switching transistor STFT.
  • the driving module 02 and the compensation module 04 jointly provide the compensated driving voltage for the light emitting device 01 through the node N1; wherein the driving current input to the light emitting device 01 is:
  • V up module 04 to compensate for output voltage compensation.
  • the driving voltage of the light emitting device 01 is compensated, and the brightness reduction caused when the light emitting device 01 drives the light emitting device 01 with the same driving voltage with the increase of the use time is avoided.
  • the problem that the display panel is uneven in brightness is improved, and the uniformity of display brightness of the display panel is improved.
  • V gs, DTFT is the potential difference between the gate and source of the driving transistor DTFT
  • ⁇ is the carrier mobility
  • Cox is the gate insulating layer capacitance
  • W/L is the transistor width to length ratio
  • Vdata is the data voltage
  • Vdd For the supply voltage
  • Vth is the threshold voltage of the drive transistor DTFT.
  • the driving transistor DTFT of the driving module 02 may be a P-type transistor or an N-type transistor, which is not limited herein.
  • the above-mentioned light-emitting device 01 generally refers to an organic light-emitting diode (OLED), and may of course be other electroluminescent devices, which is not limited herein.
  • OLED organic light-emitting diode
  • the sampling module 03 in the pixel circuit may specifically include: a first thin film transistor T1 and a second thin film transistor T2; ,
  • the gate of the first thin film transistor T1 is electrically connected to the sampling signal control terminal SW1, and the sampling signal control terminal SW1 is configured to control the sampling module 03 to be in an on state during the sampling period;
  • a drain of the first thin film transistor T1 is electrically connected to a source of the second thin film transistor T2 and an output end of the driving module 02;
  • the source of the first thin film transistor T1 is electrically connected to the gate of the second thin film transistor T2;
  • the drain of the second thin film transistor T2 is electrically connected to the input end of the processing module 05.
  • the first thin film transistor T1 and the second thin film transistor T2 of the sampling module 03 can be N-type transistors or P-type transistors at the same time. There is no limit here.
  • the first thin film transistor T1 and the second thin film transistor T2 are P-type transistors.
  • the sampling module 03 provided by the embodiment of the present invention receives the low-level signal when the sampling signal control terminal SW1 receives the low-level signal.
  • the transistor T1 and the second thin film transistor T2 are in an on state, and constitute a unidirectional signal path from the output end of the driving module 02 to the input end of the processing module 05, that is, the output of the driving module 02 under the control of the sampling signal control terminal SW1.
  • the drive voltage is sampled. Moreover, according to the connection relationship between the first thin film transistor T1 and the second thin film transistor T2, the transmission direction of the signal in the sampling module 03 can only be single-passed from the output end of the driving module 02 to the input end of the processing module 05, To the end.
  • the compensation module 04 of the pixel circuit may specifically include: a third thin film transistor T3 and a fourth thin film transistor T4;
  • the gate of the third thin film transistor T3 is electrically connected to the compensation signal control terminal SW2, and the compensation signal control terminal SW2 is used to control the compensation module 04 to be in an on state during the compensation period;
  • a drain of the third thin film transistor T3 is electrically connected to a source of the fourth thin film transistor T4 and an output end of the processing module 05;
  • the source of the third thin film transistor T3 is electrically connected to the gate of the fourth thin film transistor T4;
  • the drain of the fourth thin film transistor T4 is electrically connected to the input end of the light emitting device.
  • the third thin film transistor T3 and the fourth thin film transistor T4 of the compensation module 04 may be N-type transistors or P-type transistors at the same time, which is not limited herein.
  • the third thin film transistor T3 and the fourth thin film transistor T4 are P-type transistors.
  • the compensation module 04 provided by the embodiment of the present invention receives the low-level signal when the compensation signal control terminal SW2 receives the third film.
  • the transistor T3 and the fourth thin film transistor T4 are in an on state, and constitute a unidirectional signal path from the output end of the processing module 05 to the input end of the light emitting device 01, that is, the output of the processing module 05 under the control of the compensation signal control terminal SW2.
  • the compensation voltage is input to the input terminal of the light emitting device 01.
  • the transmission direction of the signal in the compensation module 04 can only be single-passed from the output end of the processing module 05 to the input end of the light-emitting device 01. To the end.
  • the sampling module 03 and the compensation module 04 and the driving module 02 and the light emitting device 01 are generally disposed in a display area of the display panel, and the processing module is 05 is set in the non-display area.
  • the processing module is 05 is set in the non-display area.
  • the input end and the output end of the processing module 05 are set to be the same port, that is, the output end of the sampling module 03 and the input end of the compensation module 04 are commonly connected to one port of the processing module 05.
  • the sampling signal control terminal SW1 or the compensation signal control terminal SW2 is required to be time-divisionally required.
  • the corresponding sampling module 03 or the compensation module 04 is driven to be in an on state, and the sampling timing of the sampling signal control terminal SW1 and the compensation signal control terminal SW2 is as shown in FIG. 4 . In this way, the unidirectionality of the signal flow is ensured, so that the sampling process and the compensation process are not interfered by external signals.
  • the foregoing pixel circuit provided by the embodiment of the present invention may further include an output connected between the output end of the sampling module 03 and the input end of the processing module 05, and connected to the input end of the compensation module 04 and the output of the processing module 05.
  • Cache module 06 between the ends. As shown in FIG. 3, the cache module 06 can buffer the drive voltage signal sampled by the sampling module 03 or the compensation voltage signal determined by the processing module 05. In this way, the buffering module 06 is used to buffer the sampling voltage signal or the compensation voltage signal, and on the one hand, the current to voltage signal conversion can be performed, and on the other hand, the working timing of the corresponding sampling signal control terminal SW1 or the compensation signal control terminal SW2 is reduced, and the implementation is reduced. Externally compensated real-time data read and write refresh frequency, thereby reducing power consumption.
  • the cache module 06 in the pixel circuit provided by the embodiment of the present invention, as shown in FIG. 3, may be a capacitor C1.
  • One end a of the capacitor C1 is connected to the output end of the sampling module 03 and the processing module 05. Between the inputs, and between the input of the compensation module 04 and the output of the processing module 05, the other end b is grounded.
  • the driving voltage of the light emitting device 01 can be preferably sampled or compensated, thereby compensating for the attenuation of the electrical performance of the light emitting device 01 to ensure The display system displays the uniformity of brightness.
  • the analog-to-digital conversion unit 051 is configured to convert an analog signal of the driving voltage sampled by the sampling module 03 into a corresponding digital signal;
  • a storage unit 052 configured to store a correspondence between a change in the brightness of the light-emitting device 01 that is established in advance and a driving voltage as a function of the time of use;
  • a determining unit 053 configured to perform a digital signal converted according to the analog-to-digital conversion unit 051, and a corresponding relationship between a change in the light-emitting brightness of the light-emitting device and the driving voltage Determining a digital signal of a compensation voltage corresponding to a driving voltage;
  • the digital-to-analog conversion unit 054 is configured to convert the digital signal of the compensation voltage determined by the determining unit 053 into a corresponding analog signal.
  • FIG. 5 and FIG. 6 respectively show circuit diagrams of the analog-to-digital conversion unit and the digital-to-analog conversion unit. Since the working principle of the analog-to-digital conversion circuit and the digital-to-analog conversion circuit is the same as that of the prior art, the repeated description will not be repeated here.
  • the corresponding relationship between the light-emitting luminance and the driving voltage of the light-emitting device 01 stored in the memory unit in the processing module 05 in the pixel circuit provided by the embodiment of the present invention is based on the VL curve of the light-emitting device 01, that is, the light-emitting device 01.
  • the corresponding relationship between the time and the driving voltage of the monochrome light-emitting luminance is as shown in FIG. 7, and the corresponding look-up table is established and stored in the storage unit 052 in advance.
  • the processing module 05 determines a compensation voltage corresponding to the driving voltage according to a look-up table of the corresponding relationship between the light-emitting luminance of the light-emitting device 01 and the driving voltage, which is stored in advance by the storage unit 052, and outputs the compensation voltage to the compensation module 04.
  • the compensation module 04 outputs the compensation voltage to the light emitting device 01 to compensate the driving voltage of the light emitting device 01, thereby compensating for the attenuation of the electrical performance of the light emitting device, thereby avoiding the use of the same driving due to the increase of the use time of the light emitting device 01.
  • the voltage is driven to the light-emitting device 01, the brightness is lowered, and the display brightness of the display panel is uneven, which improves the uniformity of display brightness of the display panel and ensures uniformity of display brightness of the display system.
  • an embodiment of the present invention further provides a display device, including any of the above pixel circuits provided by the embodiments of the present invention. Since the principle of solving the problem of the display device is similar to that of the pixel circuit, the implementation of the display device can be referred to the implementation of the pixel circuit, and the repeated description is omitted.
  • the above display device provided by the embodiment of the present invention can be applied to a liquid crystal display panel, and can also be applied to an organic electroluminescence display panel, which is not limited herein.
  • the display device may be a display, a mobile phone, a television, a notebook, an all-in-one, etc., and other essential components of the display device are understood by those of ordinary skill in the art, and will not be described herein. As a limitation of the invention.
  • an embodiment of the present invention further provides a driving method of a pixel circuit, as shown in FIG. 8 , including the following steps:
  • the sampling module samples the driving voltage, and inputs the sampled driving voltage to the processing module under the control of the sampling signal control end;
  • the sampling module may sample the driving voltage between each frame in which the driving module inputs the driving voltage to the light emitting device, and may also sample the driving voltage in each frame time, which is not limited herein;
  • the processing module determines a compensation voltage corresponding to the driving voltage according to a driving voltage sampled by the sampling module and a corresponding relationship between the driving brightness and the driving brightness of the pre-stored light-emitting device, and inputs the compensation voltage to the compensation voltage.
  • Compensation module determines a compensation voltage corresponding to the driving voltage according to a driving voltage sampled by the sampling module and a corresponding relationship between the driving brightness and the driving brightness of the pre-stored light-emitting device, and inputs the compensation voltage to the compensation voltage.
  • the compensation module inputs the compensation voltage determined by the processing module to the light emitting device under the control of the compensation signal control end.
  • the sampling module samples the driving voltage
  • the processing module processes according to the driving voltage sampled by the sampling module, and pre-stores
  • the illuminating brightness of the illuminating device is matched with the driving voltage according to the change of the use time, and the compensation voltage corresponding to the driving voltage is obtained, and the compensation module inputs the compensation voltage determined by the processing module to the corresponding illuminating device, thereby realizing the illuminating according to the illuminating device.
  • the different use time of the device compensates the driving voltage of the light-emitting device differently, which avoids the decrease of the brightness of the light-emitting device when the light-emitting device drives the light-emitting device with the same driving voltage as the light-emitting device increases with the use time.
  • the problem that the display panel is uneven in brightness is improved, and the uniformity of display brightness of the display panel is improved.
  • the processing module according to the driving voltage sampled by the sampling module and the corresponding brightness of the light emitting brightness of the light emitting device with the driving time according to the change of the use time
  • the relationship, determining the compensation voltage corresponding to the driving voltage can be achieved in the following manner:
  • the analog-to-digital conversion unit in the processing module converts the analog signal of the driving voltage sampled by the sampling module into a corresponding digital signal
  • the determining unit in the processing module determines to compensate the light emitting device according to the digital signal converted by the analog-to-digital conversion unit and the corresponding relationship between the change of the light-emitting brightness of the light-emitting device and the driving voltage stored in advance by the storage unit.
  • Digital signal of the compensation voltage
  • the digital to analog conversion unit in the processing module converts the digital signal of the compensation voltage determined by the determination unit into a corresponding analog signal.
  • the embodiment of the present invention provides a pixel circuit, a driving method thereof, and a display device.
  • the driving module provides a driving voltage for the light emitting device
  • the sampling module samples the driving voltage and processes the pixel. The module is based on the driving voltage sampled by the sampling module.
  • the compensation function of the driving voltage of the light emitting device is different according to the use time of the light emitting device, thereby avoiding the brightness of the light emitting device which occurs when the light emitting device drives the light emitting device with the same driving voltage as the light emitting device increases with the use time.
  • the problem of uneven display brightness of the display panel caused by the decrease is improved, and the uniformity of display brightness of the display panel is improved.

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
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Abstract

Disclosed are a pixel circuit, a driving method thereof and a display device thereof. In the pixel circuit, when a driving module (02) provides a driving voltage to a light-emitting device (01), a sampling module (03) samples the driving voltage, a processing module (05) performs processing according to the driving voltage sampled by the sampling module as well as a correspondence relation between the pre-stored luminance of the light-emitting device (01) and the driving voltage as a function of service time, so as to obtain a compensation voltage corresponding to the driving voltage; a compensation module (04) inputs the compensation voltage determined by the processing module (05) into the corresponding light-emitting device (01). Thus, the function of differently compensating for the driving voltage of the light-emitting device according to different service time of the light-emitting device (01), the problem is solved that non-uniform display luminance of a display panel is caused by a decrease in the luminance of the light-emitting device (01) over the service time of the light-emitting device (01) when the same driving voltage is utilized to drive the light-emitting device (01), and the display luminance uniformity of the display panel is improved.

Description

一种像素电路、其驱动方法及显示装置Pixel circuit, driving method thereof and display device 技术领域Technical field
本发明涉及显示技术领域，尤其涉及一种像素电路、其驱动方法及显示装置。The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and a display device.
背景技术Background technique
目前，在发明人已知的有机电致发光显示器件(OLED，Organic Light Emitting Diode)中，OLED器件的发光亮度和驱动电流成正比，且和驱动电压成指数关系；在低灰度显示的状态下，OLED器件的驱动电压对其发光亮度的变化影响非常明显。OLED器件的电气性能随着使用时间的增加而有所衰减，OLED器件在使用过程中其电压降会有所增加，即随着使用时间的增长，当采用相同的驱动电压驱动OLED器件时OLED器件的亮度会降低，使得显示亮度不均匀，从而影响整个图像的显示效果。并且，OLED器件属于电流驱动器件，需要稳定的电流来控制发光，但是由于工艺制程和器件老化等原因，会使像素电路的驱动晶体管的阈值电压Vth存在不均匀性，这样就导致了流过每个像素点处的OLED的电流发生变化使得显示亮度不均匀，也会影响整个图像的显示效果。At present, in an organic light emitting device (OLED) known by the inventors, the luminance of the OLED device is proportional to the driving current and exponentially related to the driving voltage; in the state of low gray scale display Under the IGBT device, the driving voltage has a significant influence on the change of its illuminance. The electrical performance of OLED devices is attenuated with increasing use time. The voltage drop of OLED devices will increase during use, that is, as the use time increases, OLED devices are used when driving OLED devices with the same driving voltage. The brightness of the image is lowered, resulting in uneven display brightness, which affects the display of the entire image. Moreover, the OLED device belongs to a current driving device, and requires a stable current to control the light emission. However, due to the process process and the aging of the device, the threshold voltage Vth of the driving transistor of the pixel circuit is uneven, which causes the flow to flow. The current of the OLED at each pixel changes to make the display brightness uneven, which also affects the display of the entire image.
因此，在进行像素电路设计时一般会引入相应的内部补偿技术。一种具有内部补偿功能的像素电路，如图1所示，包括：驱动晶体管T1、开关晶体管T2、输入控制电路模块、电容C和OLED器件。在像素电路工作时，采用该内部补偿电路，可以使驱动发光器件发光的驱动电压仅与数据信号端处输入的数据信号电压有关，与驱动晶体管的阈值电压无关，能避免阈值电压对发光器件的影响，但是，不能消除OLED器件在使用过程中其电压降会有所增加的现象，使得显示亮度不均匀，影响整个图像的显示效果。Therefore, corresponding internal compensation techniques are generally introduced when designing a pixel circuit. A pixel circuit having an internal compensation function, as shown in FIG. 1, includes a driving transistor T1, a switching transistor T2, an input control circuit module, a capacitor C, and an OLED device. When the pixel circuit is in operation, the internal compensation circuit can be used to make the driving voltage for driving the light emitting device to be related only to the data signal voltage input at the data signal end, irrespective of the threshold voltage of the driving transistor, and the threshold voltage can be avoided for the light emitting device. The effect, however, cannot eliminate the phenomenon that the voltage drop of the OLED device will increase during use, making the display brightness uneven, affecting the display effect of the entire image.
因此，如何缓解由于OLED器件的电气性能随着使用时间的增长而衰减带来的影响整个图像的显示效果的问题，是本领域技术人员亟需解决的问题。Therefore, how to alleviate the problem that affects the display effect of the entire image due to the attenuation of the electrical performance of the OLED device with the increase of the use time is an urgent problem to be solved by those skilled in the art.
发明内容Summary of the invention
本发明实施例提供了一种像素电路、其驱动方法及显示装置，用以解决发光器件随着使用时间的增长亮度降低带来的显示面板显示亮度不均匀的问 题。The embodiment of the present invention provides a pixel circuit, a driving method thereof, and a display device, which are used to solve the problem that the brightness of the display panel is uneven due to the decrease of the brightness of the light-emitting device. question.
本发明实施例提供了一种像素电路，包括发光器件和用于为所述发光器件提供驱动电压的驱动模块，还包括：采样模块、补偿模块、以及处理模块；其中，An embodiment of the present invention provides a pixel circuit, including a light emitting device and a driving module for providing a driving voltage for the light emitting device, further comprising: a sampling module, a compensation module, and a processing module;
所述采样模块的输入端与所述驱动模块的输出端相连，所述采样模块用于对所述驱动模块提供的驱动电压进行采样；An input end of the sampling module is connected to an output end of the driving module, and the sampling module is configured to sample a driving voltage provided by the driving module;
所述处理模块的输入端与所述采样模块的输出端相连，所述处理模块用于根据所述采样模块采样到的驱动电压，以及预先存储的所述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定与所述驱动电压对应的补偿电压；An input end of the processing module is connected to an output end of the sampling module, the processing module is configured to use a driving voltage sampled according to the sampling module, and a pre-stored brightness of the light emitting device according to a usage time Determining a corresponding voltage with a corresponding voltage to determine a compensation voltage corresponding to the driving voltage;
所述补偿模块的输入端与所述处理模块的输出端相连，所述补偿模块用于将所述处理模块确定出的补偿电压输入到所述发光器件。An input end of the compensation module is connected to an output end of the processing module, and the compensation module is configured to input a compensation voltage determined by the processing module to the light emitting device.
本发明实施例提供的上述像素电路中，在驱动模块为发光器件提供驱动电压时，采样模块对该驱动电压进行采样，处理模块根据采样模块采样到的驱动电压进行处理，以及预先存储的发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，得到与该驱动电压对应的补偿电压，补偿模块将处理模块确定出的补偿电压输入到对应的发光器件，实现了根据发光器件使用时间的不同对发光器件的驱动电压进行不同的补偿功能，避免了由于发光器件随着使用时间的增长当采用相同的驱动电压驱动发光器件时出现的发光器件的亮度会降低，而造成的显示面板的显示亮度不均匀的问题，提高了显示面板显示亮度的均匀性。In the above pixel circuit provided by the embodiment of the present invention, when the driving module provides a driving voltage for the light emitting device, the sampling module samples the driving voltage, the processing module processes according to the driving voltage sampled by the sampling module, and the pre-stored light emitting device. The brightness of the light-emitting brightness is matched with the driving voltage according to the change of the use time, and the compensation voltage corresponding to the driving voltage is obtained, and the compensation module inputs the compensation voltage determined by the processing module to the corresponding light-emitting device, thereby realizing the use time of the light-emitting device. Different compensation functions for the driving voltage of the light-emitting device are avoided, and the brightness of the light-emitting device which occurs when the light-emitting device drives the light-emitting device with the same driving voltage is reduced as the light-emitting device increases with the use time, thereby causing the display panel to be The problem of uneven brightness is displayed, and the uniformity of display brightness of the display panel is improved.
在一种可能的实施方式中，本发明实施例提供的上述像素电路中，所述采样模块包括：第一薄膜晶体管和第二薄膜晶体管；其中，In a possible implementation manner, in the foregoing pixel circuit provided by the embodiment of the present invention, the sampling module includes: a first thin film transistor and a second thin film transistor; wherein
所述第一薄膜晶体管的栅极与采样信号控制端电性相连，所述采样信号控制端用于在采样时间段控制所述采样模块处于导通状态；The gate of the first thin film transistor is electrically connected to the sampling signal control end, and the sampling signal control end is configured to control the sampling module to be in an on state during a sampling period;
所述第一薄膜晶体管的漏极分别与所述第二薄膜晶体管的源极和所述驱动模块的输出端电性相连；a drain of the first thin film transistor is electrically connected to a source of the second thin film transistor and an output end of the driving module;
所述第一薄膜晶体管的源极与所述第二薄膜晶体管的栅极电性相连；a source of the first thin film transistor is electrically connected to a gate of the second thin film transistor;
所述第二薄膜晶体管的漏极与所述处理模块的输入端电性相连。The drain of the second thin film transistor is electrically connected to the input end of the processing module.
在一种可能的实施方式中，本发明实施例提供的上述像素电路中，所述补偿模块包括：第三薄膜晶体管和第四薄膜晶体管：其中， In a possible implementation manner, in the foregoing pixel circuit provided by the embodiment of the present invention, the compensation module includes: a third thin film transistor and a fourth thin film transistor: wherein
所述第三薄膜晶体管的栅极与补偿信号控制端电性相连，所述补偿信号控制端用于在补偿时间段控制所述补偿模块处于导通状态；The gate of the third thin film transistor is electrically connected to the compensation signal control end, and the compensation signal control end is configured to control the compensation module to be in an on state during the compensation period;
所述第三薄膜晶体管的漏极分别与所述第四薄膜晶体管的源极和所述处理模块的输出端电性相连；a drain of the third thin film transistor is electrically connected to a source of the fourth thin film transistor and an output end of the processing module;
所述第三薄膜晶体管源极与所述第四薄膜晶体管的栅极电性相连；The third thin film transistor source is electrically connected to the gate of the fourth thin film transistor;
所述第四薄膜晶体管的漏极与所述发光器件输入端电性相连。The drain of the fourth thin film transistor is electrically connected to the input end of the light emitting device.
在一种可能的实施方式中，本发明实施例提供的上述像素电路中，所述处理模块的输入端与输出端为同一个端口；所述采样信号控制端或所述补偿信号控制端分时驱动对应的所述采样模块或补偿模块处于导通状态。In a possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, the input end and the output end of the processing module are the same port; the sampling signal control end or the compensation signal control end is time-sharing The sampling module or the compensation module corresponding to the driving is in an on state.
在一种可能的实施方式中，本发明实施例提供的上述像素电路中，还包括：连接于所述采样模块的输出端与所述处理模块的输入端之间、并且连接于所述补偿模块的输入端与所述处理模块的输出端之间的缓存模块；所述缓存模块用于缓存所述采样模块采样的驱动电压信号或所述处理模块确定的补偿电压信号。In a possible implementation manner, the foregoing pixel circuit provided by the embodiment of the present invention further includes: connecting between an output end of the sampling module and an input end of the processing module, and connected to the compensation module a cache module between the input end and the output end of the processing module; the cache module is configured to buffer a driving voltage signal sampled by the sampling module or a compensation voltage signal determined by the processing module.
在一种可能的实施方式中，本发明实施例提供的上述像素电路中，所述缓存模块包括电容，所述电容的一端接地，另一端连接于所述采样模块的输出端与所述处理模块的输入端之间，并且连接于所述补偿模块的输入端与所述处理模块的输出端之间。In a possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, the cache module includes a capacitor, one end of the capacitor is grounded, and the other end is connected to an output end of the sampling module and the processing module. Between the inputs and between the input of the compensation module and the output of the processing module.
在一种可能的实施方式中，本发明实施例提供的上述像素电路中，所述处理模块包括：In a possible implementation manner, in the foregoing pixel circuit provided by the embodiment of the present invention, the processing module includes:
模数转换单元，用于将所述采样模块采样到的驱动电压的模拟信号转换成对应的数字信号；An analog-to-digital conversion unit, configured to convert an analog signal of a driving voltage sampled by the sampling module into a corresponding digital signal;
存储单元，用于存储预先建立的所述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系；a storage unit, configured to store a correspondence between a change in the light-emitting brightness of the light-emitting device that is established in advance and a driving voltage according to a change in use time;
确定单元，用于根据所述模数转换单元转换后的数字信号，以及预先存储的所述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定出与所述驱动电压对应的补偿电压的数字信号；a determining unit, configured to determine, according to the digital signal converted by the analog-to-digital conversion unit, and the pre-stored light-emitting luminance of the light-emitting device, corresponding to a change in usage time and a driving voltage, to determine a corresponding to the driving voltage Digital signal of the compensation voltage;
数模转换单元，用于将所述确定单元确定的补偿电压的数字信号转换成对应的模拟信号。And a digital-to-analog conversion unit, configured to convert the digital signal of the compensation voltage determined by the determining unit into a corresponding analog signal.
本发明实施例提供了一种显示装置，包括本发明实施例提供的上述任意一种像素电路。 An embodiment of the present invention provides a display device, including any of the above pixel circuits provided by the embodiments of the present invention.
本发明实施例提供了一种像素电路的驱动方法，包括：Embodiments of the present invention provide a driving method of a pixel circuit, including:
在驱动模块向发光器件输入驱动电压时，采样模块对所述驱动电压进行采样，并在采样信号控制端的控制下将采样到的所述驱动电压输入到处理模块；When the driving module inputs a driving voltage to the light emitting device, the sampling module samples the driving voltage, and inputs the sampled driving voltage to the processing module under the control of the sampling signal control end;
处理模块根据所述采样模块采样到的所述驱动电压，以及预先存储的所述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定与所述驱动电压对应的补偿电压，并将所述补偿电压输入到补偿模块；The processing module determines the compensation voltage corresponding to the driving voltage according to the driving voltage sampled by the sampling module and the pre-stored brightness of the light-emitting device, and the corresponding relationship between the driving time and the driving voltage. And inputting the compensation voltage to the compensation module;
所述补偿模块在补偿信号控制端的控制下将所述处理模块确定出的补偿电压输入到所述发光器件。The compensation module inputs the compensation voltage determined by the processing module to the light emitting device under the control of the compensation signal control terminal.
在一种可能的实施方式中，本发明实施例提供的上述像素电路驱动方法中，所述处理模块根据所述采样模块采样到的所述驱动电压，以及预先存储的所述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定与所述驱动电压对应的补偿电压，具体包括：In a possible implementation manner, in the pixel circuit driving method of the embodiment of the present invention, the processing module is configured according to the driving voltage sampled by the sampling module, and the pre-stored brightness of the light emitting device. The compensation voltage corresponding to the driving voltage is determined according to the corresponding relationship between the change of the use time and the driving voltage, and specifically includes:
所述处理模块中的模数转换单元将所述采样模块采样到的驱动电压的模拟信号转换成对应的数字信号；An analog-to-digital conversion unit in the processing module converts an analog signal of a driving voltage sampled by the sampling module into a corresponding digital signal;
所述处理模块中的确定单元根据所述模数转换单元转换后的数字信号，以及预先存储的所述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定出对所述发光器件进行补偿的补偿电压的数字信号；Determining, by the determining unit, the digital signal converted by the analog-to-digital conversion unit, and the pre-stored corresponding brightness of the light-emitting device of the light-emitting device according to the change of the use time and the driving voltage, determining the a digital signal of a compensation voltage that is compensated by the light emitting device;
所述处理模块中的数模转换单元将所述确定单元确定的补偿电压的数字信号转换成对应的模拟信号。The digital-to-analog conversion unit in the processing module converts the digital signal of the compensation voltage determined by the determining unit into a corresponding analog signal.
附图说明DRAWINGS
图1为现有技术中采用内部补偿的像素电路的结构示意图；1 is a schematic structural view of a pixel circuit using internal compensation in the prior art;
图2为本发明实施例提供的像素电路的结构示意图；2 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
图3为本发明实施例提供的像素电路的具体结构示意图；3 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
图4为本发明实施例提供的像素电路中的采样信号控制端与补偿信号控制端的工作时序图；4 is a timing chart of operation of a sampling signal control end and a compensation signal control end in a pixel circuit according to an embodiment of the present invention;
图5为本发明实施例提供的模数转换电路的结构示意图；FIG. 5 is a schematic structural diagram of an analog-to-digital conversion circuit according to an embodiment of the present invention;
图6为本发明实施例提供的数模转换电路的结构示意图；FIG. 6 is a schematic structural diagram of a digital-to-analog conversion circuit according to an embodiment of the present invention;
图7为本发明实施例提供的发光器件的发光亮度与驱动电压的对应关系曲线； FIG. 7 is a corresponding relationship diagram between light emission luminance and driving voltage of a light emitting device according to an embodiment of the present invention; FIG.
图8为本发明实施例提供的像素电路的驱动方法的流程图。FIG. 8 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present invention.
具体实施方式detailed description
下面结合附图，对本发明实施例提供的像素电路、其驱动方法及显示装置的具体实施方式进行详细地说明。The specific embodiments of the pixel circuit, the driving method and the display device provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
本发明实施例提供的一种像素电路，如图2所示，包括发光器件01和用于为发光器件提供驱动电压的驱动模块02，还包括：采样模块03、补偿模块04、以及处理模块05；其中，A pixel circuit, as shown in FIG. 2, includes a light emitting device 01 and a driving module 02 for providing a driving voltage for the light emitting device, and further includes: a sampling module 03, a compensation module 04, and a processing module 05. ;among them,
采样模块03的输入端与驱动模块02的输出端相连，采样模块03用于对驱动模块02提供的驱动电压进行采样；The input end of the sampling module 03 is connected to the output end of the driving module 02, and the sampling module 03 is used to sample the driving voltage provided by the driving module 02;
处理模块05的输入端与采样模块03的输出端相连，处理模块05用于根据采样模块03采样到的驱动电压，以及预先存储的发光器件01的发光亮度与驱动电压的对应关系，确定与驱动电压对应的补偿电压；The input end of the processing module 05 is connected to the output end of the sampling module 03. The processing module 05 is configured to determine and drive according to the driving voltage sampled by the sampling module 03 and the corresponding relationship between the brightness of the light-emitting device 01 and the driving voltage stored in advance. The voltage corresponding to the compensation voltage;
补偿模块04的输入端与处理模块05的输出端相连，补偿模块04用于将处理模块05确定出的补偿电压输入到发光器件。The input of the compensation module 04 is connected to the output of the processing module 05, and the compensation module 04 is used to input the compensation voltage determined by the processing module 05 to the light-emitting device.
在具体实施时，本发明实施例提供的上述像素电路中，驱动模块02为发光器件01提供驱动电压，在驱动模块02对发光器件01输入驱动电压时，采样模块03对驱动电压进行采样，并将采样的驱动电压输出到处理模块05；处理模块05对采样电压进行处理，确定与驱动电压对应的补偿电压，并将补偿电压输出到补偿模块04；补偿模块04将处理模块05确定的补偿电压输入到发光器件01。In a specific implementation, in the pixel circuit provided by the embodiment of the present invention, the driving module 02 provides a driving voltage for the light emitting device 01, and when the driving module 02 inputs a driving voltage to the light emitting device 01, the sampling module 03 samples the driving voltage, and The sampled driving voltage is output to the processing module 05; the processing module 05 processes the sampling voltage, determines a compensation voltage corresponding to the driving voltage, and outputs the compensation voltage to the compensation module 04; the compensation module 04 determines the compensation voltage determined by the processing module 05. Input to the light emitting device 01.
本发明实施例提供的上述像素电路中，在驱动模块02为发光器件01提供驱动电压时，采样模块03对该驱动电压进行采样，处理模块05根据采样模块03采样到的驱动电压进行处理，以及预先存储的发光器件01的发光亮度随着使用时间的变化与驱动电压的对应关系，得到与该驱动电压对应的补偿电压，补偿模块04将处理模块05确定出的补偿电压输入到对应的发光器件01，实现了根据发光器件01使用时间的不同对发光器件01的驱动电压进行不同的补偿功能，避免了由于发光器件01随着使用时间的增长当采用相同的驱动电压驱动发光器件01时出现的发光器件的亮度会降低，而造成的显示面板的显示亮度不均匀的问题，提高了显示面板显示亮度的均匀性。In the above pixel circuit provided by the embodiment of the present invention, when the driving module 02 supplies the driving voltage to the light emitting device 01, the sampling module 03 samples the driving voltage, and the processing module 05 processes according to the driving voltage sampled by the sampling module 03, and The pre-stored light-emitting luminance of the light-emitting device 01 is a compensation voltage corresponding to the driving voltage according to the corresponding relationship between the change of the use time and the driving voltage, and the compensation module 04 inputs the compensation voltage determined by the processing module 05 to the corresponding light-emitting device. 01, which realizes different compensation functions for the driving voltage of the light emitting device 01 according to the use time of the light emitting device 01, and avoids the occurrence of the light emitting device 01 when the light emitting device 01 is driven by the same driving voltage as the use time of the light emitting device 01 increases. The brightness of the light-emitting device is lowered, and the display brightness of the display panel is uneven, which improves the uniformity of display brightness of the display panel.
进一步地，本发明实施例提供的上述像素电路中，如图3所示，驱动模 块02可以跟现有技术相同，采用内部补偿电路，具体包括：输入控制模块、电容Cst、驱动晶体管DTFT、开关晶体管STFT。在像素电路工作时，驱动模块02与补偿模块04共同通过节点N1为发光器件01提供补偿后的驱动电压；其中，输入到发光器件01的驱动电流为：Further, in the above pixel circuit provided by the embodiment of the present invention, as shown in FIG. 3, the driving mode is The block 02 can be the same as the prior art, and adopts an internal compensation circuit, and specifically includes: an input control module, a capacitor Cst, a driving transistor DTFT, and a switching transistor STFT. When the pixel circuit is in operation, the driving module 02 and the compensation module 04 jointly provide the compensated driving voltage for the light emitting device 01 through the node N1; wherein the driving current input to the light emitting device 01 is:
Figure PCTCN2014086311-appb-000001
Figure PCTCN2014086311-appb-000001
其中，V补为补偿模块04输出的补偿电压。这样，通过上述像素电路的工作过程，实现了对发光器件01的驱动电压进行补偿，避免了由于发光器件01随着使用时间的增长当采用相同的驱动电压驱动发光器件01时出现的亮度降低，而造成的显示面板的显示亮度不均匀的问题，提高了显示面板显示亮度的均匀性。这里，Vgs,DTFT为驱动管DTFT栅极和源极之间的电势差，μ为载流子迁移率，Cox为栅绝缘层电容，W/L为晶体管宽长比，Vdata为数据电压，Vdd为电源电压，Vth为驱动管DTFT的阈值电压。Wherein, V up module 04 to compensate for output voltage compensation. Thus, by the operation process of the pixel circuit described above, the driving voltage of the light emitting device 01 is compensated, and the brightness reduction caused when the light emitting device 01 drives the light emitting device 01 with the same driving voltage with the increase of the use time is avoided. The problem that the display panel is uneven in brightness is improved, and the uniformity of display brightness of the display panel is improved. Here, V gs, DTFT is the potential difference between the gate and source of the driving transistor DTFT, μ is the carrier mobility, Cox is the gate insulating layer capacitance, W/L is the transistor width to length ratio, Vdata is the data voltage, Vdd For the supply voltage, Vth is the threshold voltage of the drive transistor DTFT.
具体地，驱动模块02具有的驱动晶体管DTFT可以采用P型晶体管，也可以采用N型晶体管，在此不做限定。Specifically, the driving transistor DTFT of the driving module 02 may be a P-type transistor or an N-type transistor, which is not limited herein.
具体地，上述发光器件01一般是指有机发光二极管(OLED)，当然也可以是其他电致发光器件，在此不限定。Specifically, the above-mentioned light-emitting device 01 generally refers to an organic light-emitting diode (OLED), and may of course be other electroluminescent devices, which is not limited herein.
进一步地，本发明实施例提供的上述像素电路，在具体实施时，上述像素电路中的采样模块03，如图3所示，可以具体包括：第一薄膜晶体管T1和第二薄膜晶体管T2；其中，Further, in the above-mentioned pixel circuit provided by the embodiment of the present invention, the sampling module 03 in the pixel circuit, as shown in FIG. 3, may specifically include: a first thin film transistor T1 and a second thin film transistor T2; ,
第一薄膜晶体管T1的栅极与采样信号控制端SW1电性相连，采样信号控制端SW1用于在采样时间段控制采样模块03处于导通状态；The gate of the first thin film transistor T1 is electrically connected to the sampling signal control terminal SW1, and the sampling signal control terminal SW1 is configured to control the sampling module 03 to be in an on state during the sampling period;
第一薄膜晶体管T1的漏极分别与第二薄膜晶体管T2的源极和驱动模块02的输出端电性相连；a drain of the first thin film transistor T1 is electrically connected to a source of the second thin film transistor T2 and an output end of the driving module 02;
第一薄膜晶体管T1的源极与第二薄膜晶体管T2的栅极电性相连；The source of the first thin film transistor T1 is electrically connected to the gate of the second thin film transistor T2;
第二薄膜晶体管T2的漏极与处理模块05的输入端电性相连。The drain of the second thin film transistor T2 is electrically connected to the input end of the processing module 05.
在具体实施时，本发明实施例提供的上述像素电路中，采样模块03的第一薄膜晶体管T1和第二薄膜晶体管T2可以同时为N型晶体管或P型晶体管， 在此不做限定。以下所述均以第一薄膜晶体管T1和第二薄膜晶体管T2为P型晶体管为例，本发明实施例提供的上述采样模块03在采样信号控制端SW1接收到低电平信号时，第一薄膜晶体管T1和第二薄膜晶体管T2处于导通状态，构成一条从驱动模块02的输出端到处理模块05的输入端的单向信号通路，即在采样信号控制端SW1的控制下对驱动模块02输出的驱动电压进行采样。并且，根据上述第一薄膜晶体管T1和第二薄膜晶体管T2的连接关系可知，在采样模块03中信号的传输方向仅能从驱动模块02的输出端到处理模块05的输入端单向导通，反向截止。In a specific implementation, in the pixel circuit provided by the embodiment of the present invention, the first thin film transistor T1 and the second thin film transistor T2 of the sampling module 03 can be N-type transistors or P-type transistors at the same time. There is no limit here. For example, the first thin film transistor T1 and the second thin film transistor T2 are P-type transistors. The sampling module 03 provided by the embodiment of the present invention receives the low-level signal when the sampling signal control terminal SW1 receives the low-level signal. The transistor T1 and the second thin film transistor T2 are in an on state, and constitute a unidirectional signal path from the output end of the driving module 02 to the input end of the processing module 05, that is, the output of the driving module 02 under the control of the sampling signal control terminal SW1. The drive voltage is sampled. Moreover, according to the connection relationship between the first thin film transistor T1 and the second thin film transistor T2, the transmission direction of the signal in the sampling module 03 can only be single-passed from the output end of the driving module 02 to the input end of the processing module 05, To the end.
进一步地，本发明实施例提供的上述像素电路，在具体实施时，上述像素电路的补偿模块04，如图3所示，可以具体包括：第三薄膜晶体管T3和第四薄膜晶体管T4；其中，Further, in the above-mentioned pixel circuit provided by the embodiment of the present invention, the compensation module 04 of the pixel circuit, as shown in FIG. 3, may specifically include: a third thin film transistor T3 and a fourth thin film transistor T4;
第三薄膜晶体管T3的栅极与补偿信号控制端SW2电性相连，补偿信号控制端SW2用于在补偿时间段控制补偿模块04处于导通状态；The gate of the third thin film transistor T3 is electrically connected to the compensation signal control terminal SW2, and the compensation signal control terminal SW2 is used to control the compensation module 04 to be in an on state during the compensation period;
第三薄膜晶体管T3的漏极分别与第四薄膜晶体管T4的源极和处理模块05的输出端电性相连；a drain of the third thin film transistor T3 is electrically connected to a source of the fourth thin film transistor T4 and an output end of the processing module 05;
第三薄膜晶体管T3的源极与第四薄膜晶体管T4的栅极电性相连；The source of the third thin film transistor T3 is electrically connected to the gate of the fourth thin film transistor T4;
第四薄膜晶体管T4的漏极与发光器件输入端电性相连。The drain of the fourth thin film transistor T4 is electrically connected to the input end of the light emitting device.
在具体实施时，本发明实施例提供的上述像素电路中，补偿模块04的第三薄膜晶体管T3和第四薄膜晶体管T4可以同时为N型晶体管或P型晶体管，在此不做限定。以下所述均以第三薄膜晶体管T3和第四薄膜晶体管T4为P型晶体管为例，本发明实施例提供的上述补偿模块04在补偿信号控制端SW2接收到低电平信号时，第三薄膜晶体管T3和第四薄膜晶体管T4处于导通状态，构成一条从处理模块05的输出端到发光器件01的输入端的单向信号通路，即在补偿信号控制端SW2的控制下将处理模块05输出的补偿电压输入到发光器件01的输入端。并且，根据上述第三薄膜晶体管T3和第四薄膜晶体管T4的连接关系可知，在补偿模块04中信号的传输方向仅能从处理模块05的输出端到发光器件01的输入端单向导通，反向截止。In a specific implementation, in the pixel circuit provided by the embodiment of the present invention, the third thin film transistor T3 and the fourth thin film transistor T4 of the compensation module 04 may be N-type transistors or P-type transistors at the same time, which is not limited herein. For example, the third thin film transistor T3 and the fourth thin film transistor T4 are P-type transistors. The compensation module 04 provided by the embodiment of the present invention receives the low-level signal when the compensation signal control terminal SW2 receives the third film. The transistor T3 and the fourth thin film transistor T4 are in an on state, and constitute a unidirectional signal path from the output end of the processing module 05 to the input end of the light emitting device 01, that is, the output of the processing module 05 under the control of the compensation signal control terminal SW2. The compensation voltage is input to the input terminal of the light emitting device 01. Moreover, according to the connection relationship between the third thin film transistor T3 and the fourth thin film transistor T4, the transmission direction of the signal in the compensation module 04 can only be single-passed from the output end of the processing module 05 to the input end of the light-emitting device 01. To the end.
进一步地，在具体实施时，在本发明实施例提供的上述像素电路中，一般将采样模块03和补偿模块04与驱动模块02和发光器件01均设置在显示面板的显示区域，而将处理模块05设置在非显示区域。为了将采样和补偿的信号传输至非显示区域，需要分别设置引出线，为了节省布线的数量，还可 以将处理模块05的输入端与输出端设置为同一个端口，即采样模块03的输出端和补偿模块04的输入端共同连接于处理模块05的一个端口。在此连接关系的基础上，为了避免采样模块03和补偿模块04之间相互干扰，在同一时刻仅允许其中一个模块处于工作状态，因此，需要采样信号控制端SW1或补偿信号控制端SW2分时驱动对应的采样模块03或补偿模块04处于导通状态，采样信号控制端SW1与补偿信号控制端SW2的工作时序，如图4所示。这样，保证了信号流动的单向性，使得采样过程与补偿过程都不受外界信号的干扰。Further, in a specific implementation, in the above pixel circuit provided by the embodiment of the present invention, the sampling module 03 and the compensation module 04 and the driving module 02 and the light emitting device 01 are generally disposed in a display area of the display panel, and the processing module is 05 is set in the non-display area. In order to transmit the sampled and compensated signals to the non-display area, it is necessary to separately set the lead lines, in order to save the number of wiring, The input end and the output end of the processing module 05 are set to be the same port, that is, the output end of the sampling module 03 and the input end of the compensation module 04 are commonly connected to one port of the processing module 05. On the basis of this connection relationship, in order to avoid mutual interference between the sampling module 03 and the compensation module 04, only one of the modules is allowed to be in operation at the same time. Therefore, the sampling signal control terminal SW1 or the compensation signal control terminal SW2 is required to be time-divisionally required. The corresponding sampling module 03 or the compensation module 04 is driven to be in an on state, and the sampling timing of the sampling signal control terminal SW1 and the compensation signal control terminal SW2 is as shown in FIG. 4 . In this way, the unidirectionality of the signal flow is ensured, so that the sampling process and the compensation process are not interfered by external signals.
在具体实施时，本发明实施例提供的上述像素电路还可以包括连接于采样模块03的输出端与处理模块05的输入端之间、并且连接于补偿模块04的输入端与处理模块05的输出端之间的缓存模块06。如图3所示，缓存模块06可以缓存采样模块03采样的驱动电压信号或处理模块05确定的补偿电压信号。这样，采用缓存模块06对采样电压信号或补偿电压信号进行缓存，一方面可以进行电流到电压的信号转换，一方面配合相应的采样信号控制端SW1或补偿信号控制端SW2的工作时序，降低实现外部补偿的实时数据读写的刷新频率，从而降低功耗。In a specific implementation, the foregoing pixel circuit provided by the embodiment of the present invention may further include an output connected between the output end of the sampling module 03 and the input end of the processing module 05, and connected to the input end of the compensation module 04 and the output of the processing module 05. Cache module 06 between the ends. As shown in FIG. 3, the cache module 06 can buffer the drive voltage signal sampled by the sampling module 03 or the compensation voltage signal determined by the processing module 05. In this way, the buffering module 06 is used to buffer the sampling voltage signal or the compensation voltage signal, and on the one hand, the current to voltage signal conversion can be performed, and on the other hand, the working timing of the corresponding sampling signal control terminal SW1 or the compensation signal control terminal SW2 is reduced, and the implementation is reduced. Externally compensated real-time data read and write refresh frequency, thereby reducing power consumption.
在具体实施时，本发明实施例提供的上述像素电路中的缓存模块06，如图3所示，可以是一个电容C1，电容C1的一端a连接于采样模块03的输出端与处理模块05的输入端之间，并且连接于补偿模块04的输入端与处理模块05的输出端之间，另一端b接地。这样，通过电容充放电过程，对采样电压或补偿电压进行缓存和释放，可以较佳地对发光器件01的驱动电压进行采样或补偿，从而对发光器件01的电气性能的衰减进行补偿，以确保显示系统显示亮度的均匀性。In a specific implementation, the cache module 06 in the pixel circuit provided by the embodiment of the present invention, as shown in FIG. 3, may be a capacitor C1. One end a of the capacitor C1 is connected to the output end of the sampling module 03 and the processing module 05. Between the inputs, and between the input of the compensation module 04 and the output of the processing module 05, the other end b is grounded. In this way, by buffering and releasing the sampling voltage or the compensation voltage through the capacitor charging and discharging process, the driving voltage of the light emitting device 01 can be preferably sampled or compensated, thereby compensating for the attenuation of the electrical performance of the light emitting device 01 to ensure The display system displays the uniformity of brightness.
在具体实施时，本发明实施例提供的上述像素电路中的处理模块05，如图3所示，具体包括：In a specific implementation, the processing module 05 in the foregoing pixel circuit provided by the embodiment of the present invention, as shown in FIG. 3, specifically includes:
模数转换单元051，用于将采样模块03采样到的驱动电压的模拟信号转换成对应的数字信号；The analog-to-digital conversion unit 051 is configured to convert an analog signal of the driving voltage sampled by the sampling module 03 into a corresponding digital signal;
存储单元052，用于存储预先建立的发光器件01的发光亮度随着使用时间的变化与驱动电压的对应关系；a storage unit 052, configured to store a correspondence between a change in the brightness of the light-emitting device 01 that is established in advance and a driving voltage as a function of the time of use;
确定单元053，用于根据模数转换单元051转换后的数字信号，以及预先存储的发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系， 确定出与驱动电压对应的补偿电压的数字信号；a determining unit 053, configured to perform a digital signal converted according to the analog-to-digital conversion unit 051, and a corresponding relationship between a change in the light-emitting brightness of the light-emitting device and the driving voltage Determining a digital signal of a compensation voltage corresponding to a driving voltage;
数模转换单元054，用于将确定单元053确定的补偿电压的数字信号转换成对应的模拟信号。The digital-to-analog conversion unit 054 is configured to convert the digital signal of the compensation voltage determined by the determining unit 053 into a corresponding analog signal.
图5和图6分别示出了模数转换单元和数模转换单元的电路示意图，由于模数转换电路与数模转换电路的工作原理与现有技术相同，在此重复之处不再赘述。FIG. 5 and FIG. 6 respectively show circuit diagrams of the analog-to-digital conversion unit and the digital-to-analog conversion unit. Since the working principle of the analog-to-digital conversion circuit and the digital-to-analog conversion circuit is the same as that of the prior art, the repeated description will not be repeated here.
在具体实施时，本发明实施例提供的像素电路中的处理模块05中的存储单元存储的发光器件01的发光亮度与驱动电压的对应关系，是根据发光器件01的VL曲线，即发光器件01的单色的发光亮度随着时间与驱动电压之间的对应关系，如图7所示，建立的相应的查找表，并预先存储到存储单元052中。处理模块05根据存储单元052预先存储的发光器件01的发光亮度随着使用时间的变化与驱动电压的对应关系的查找表，确定与驱动电压对应的补偿电压，将补偿电压输出到补偿模块04，补偿模块04将补偿电压输出到发光器件01，对发光器件01的驱动电压进行补偿，从而对发光器件电气性能的衰减进行补偿，避免了由于发光器件01随着使用时间的增长当采用相同的驱动电压驱动发光器件01时出现的亮度降低，而造成的显示面板的显示亮度不均匀的问题，提高了显示面板显示亮度的均匀性并确保了显示系统显示亮度的均匀性。In a specific implementation, the corresponding relationship between the light-emitting luminance and the driving voltage of the light-emitting device 01 stored in the memory unit in the processing module 05 in the pixel circuit provided by the embodiment of the present invention is based on the VL curve of the light-emitting device 01, that is, the light-emitting device 01. The corresponding relationship between the time and the driving voltage of the monochrome light-emitting luminance is as shown in FIG. 7, and the corresponding look-up table is established and stored in the storage unit 052 in advance. The processing module 05 determines a compensation voltage corresponding to the driving voltage according to a look-up table of the corresponding relationship between the light-emitting luminance of the light-emitting device 01 and the driving voltage, which is stored in advance by the storage unit 052, and outputs the compensation voltage to the compensation module 04. The compensation module 04 outputs the compensation voltage to the light emitting device 01 to compensate the driving voltage of the light emitting device 01, thereby compensating for the attenuation of the electrical performance of the light emitting device, thereby avoiding the use of the same driving due to the increase of the use time of the light emitting device 01. When the voltage is driven to the light-emitting device 01, the brightness is lowered, and the display brightness of the display panel is uneven, which improves the uniformity of display brightness of the display panel and ensures uniformity of display brightness of the display system.
基于同一发明构思，本发明实施例还提供了一种显示装置，包括本发明实施例提供的上述任意一种像素电路。由于该显示装置解决问题的原理与像素电路相似，因此该显示装置的实施可以参见像素电路的实施，重复之处不再赘述。Based on the same inventive concept, an embodiment of the present invention further provides a display device, including any of the above pixel circuits provided by the embodiments of the present invention. Since the principle of solving the problem of the display device is similar to that of the pixel circuit, the implementation of the display device can be referred to the implementation of the pixel circuit, and the repeated description is omitted.
在具体实施时，本发明实施例提供的上述显示装置可以应用于液晶显示面板，也可以应用于有机电致发光显示面板，在此不做限定。该显示装置可以是显示器、手机、电视、笔记本、一体机等，对于显示装置的其它必不可少的组成部分均为本领域的普通技术人员应该理解具有的，在此不做赘述，也不应作为对本发明的限制。In a specific implementation, the above display device provided by the embodiment of the present invention can be applied to a liquid crystal display panel, and can also be applied to an organic electroluminescence display panel, which is not limited herein. The display device may be a display, a mobile phone, a television, a notebook, an all-in-one, etc., and other essential components of the display device are understood by those of ordinary skill in the art, and will not be described herein. As a limitation of the invention.
基于同一发明构思，本发明实施例还提供了一种像素电路的驱动方法，如图8所示，包括如下步骤：Based on the same inventive concept, an embodiment of the present invention further provides a driving method of a pixel circuit, as shown in FIG. 8 , including the following steps:
S101、在驱动模块向发光器件输入驱动电压时，采样模块对驱动电压进行采样，并在采样信号控制端的控制下将采样到的驱动电压输入到处理模块； S101. When the driving module inputs a driving voltage to the light emitting device, the sampling module samples the driving voltage, and inputs the sampled driving voltage to the processing module under the control of the sampling signal control end;
在具体实施时，采样模块可以在驱动模块向发光器件输入驱动电压的每帧之间对驱动电压进行采样，也可以在每帧的时间内对驱动电压进行采样，在此不做限定；In a specific implementation, the sampling module may sample the driving voltage between each frame in which the driving module inputs the driving voltage to the light emitting device, and may also sample the driving voltage in each frame time, which is not limited herein;
S102、处理模块根据采样模块采样到的驱动电压，以及预先存储的发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定与驱动电压对应的补偿电压，并将补偿电压输入到补偿模块；S102. The processing module determines a compensation voltage corresponding to the driving voltage according to a driving voltage sampled by the sampling module and a corresponding relationship between the driving brightness and the driving brightness of the pre-stored light-emitting device, and inputs the compensation voltage to the compensation voltage. Compensation module
S103、补偿模块在补偿信号控制端的控制下将处理模块确定出的补偿电压输入到发光器件。S103. The compensation module inputs the compensation voltage determined by the processing module to the light emitting device under the control of the compensation signal control end.
本发明实施例提供的上述像素电路的驱动方法中，在驱动模块为发光器件提供驱动电压时，采样模块对该驱动电压进行采样，处理模块根据采样模块采样到的驱动电压进行处理，以及预先存储的发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，得到与该驱动电压对应的补偿电压，补偿模块将处理模块确定出的补偿电压输入到对应的发光器件，实现了根据发光器件使用时间的不同对发光器件的驱动电压进行不同的补偿功能，避免了由于发光器件随着使用时间的增长当采用相同的驱动电压驱动发光器件时出现的发光器件的亮度会降低，而造成的显示面板的显示亮度不均匀的问题，提高了显示面板显示亮度的均匀性。In the driving method of the pixel circuit provided by the embodiment of the present invention, when the driving module provides a driving voltage for the light emitting device, the sampling module samples the driving voltage, and the processing module processes according to the driving voltage sampled by the sampling module, and pre-stores The illuminating brightness of the illuminating device is matched with the driving voltage according to the change of the use time, and the compensation voltage corresponding to the driving voltage is obtained, and the compensation module inputs the compensation voltage determined by the processing module to the corresponding illuminating device, thereby realizing the illuminating according to the illuminating device. The different use time of the device compensates the driving voltage of the light-emitting device differently, which avoids the decrease of the brightness of the light-emitting device when the light-emitting device drives the light-emitting device with the same driving voltage as the light-emitting device increases with the use time. The problem that the display panel is uneven in brightness is improved, and the uniformity of display brightness of the display panel is improved.
在具体实施时，本发明实施例提供的上述像素电路的驱动方法中，处理模块根据采样模块采样到的驱动电压，以及预先存储的发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定与驱动电压对应的补偿电压，可以采用下述方式实现：In a specific implementation, in the driving method of the pixel circuit provided by the embodiment of the present invention, the processing module according to the driving voltage sampled by the sampling module and the corresponding brightness of the light emitting brightness of the light emitting device with the driving time according to the change of the use time The relationship, determining the compensation voltage corresponding to the driving voltage, can be achieved in the following manner:
首先，处理模块中的模数转换单元将采样模块采样到的驱动电压的模拟信号转换成对应的数字信号；First, the analog-to-digital conversion unit in the processing module converts the analog signal of the driving voltage sampled by the sampling module into a corresponding digital signal;
然后，处理模块中的确定单元根据模数转换单元转换后的数字信号，与存储单元预先存储的发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定出对发光器件进行补偿的补偿电压的数字信号；Then, the determining unit in the processing module determines to compensate the light emitting device according to the digital signal converted by the analog-to-digital conversion unit and the corresponding relationship between the change of the light-emitting brightness of the light-emitting device and the driving voltage stored in advance by the storage unit. Digital signal of the compensation voltage;
最后，处理模块中的数模转换单元将确定单元确定的补偿电压的数字信号转换成对应的模拟信号。Finally, the digital to analog conversion unit in the processing module converts the digital signal of the compensation voltage determined by the determination unit into a corresponding analog signal.
本发明实施例提供了一种像素电路、其驱动方法及显示装置，本发明实施例提供的上述像素电路中，在驱动模块为发光器件提供驱动电压时，采样模块对该驱动电压进行采样，处理模块根据采样模块采样到的驱动电压进行 处理，以及预先存储的发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，得到与该驱动电压对应的补偿电压，补偿模块将处理模块确定出的补偿电压输入到对应的发光器件，实现了根据发光器件使用时间的不同对发光器件的驱动电压进行不同的补偿功能，避免了由于发光器件随着使用时间的增长当采用相同的驱动电压驱动发光器件时出现的发光器件的亮度会降低，而造成的显示面板的显示亮度不均匀的问题，提高了显示面板显示亮度的均匀性。The embodiment of the present invention provides a pixel circuit, a driving method thereof, and a display device. In the pixel circuit provided by the embodiment of the present invention, when the driving module provides a driving voltage for the light emitting device, the sampling module samples the driving voltage and processes the pixel. The module is based on the driving voltage sampled by the sampling module. Processing, and pre-stored light-emitting luminance of the light-emitting device according to the change of the use time and the driving voltage, obtaining a compensation voltage corresponding to the driving voltage, and the compensation module inputs the compensation voltage determined by the processing module to the corresponding light-emitting device The compensation function of the driving voltage of the light emitting device is different according to the use time of the light emitting device, thereby avoiding the brightness of the light emitting device which occurs when the light emitting device drives the light emitting device with the same driving voltage as the light emitting device increases with the use time. The problem of uneven display brightness of the display panel caused by the decrease is improved, and the uniformity of display brightness of the display panel is improved.
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention
本申请要求于2014年5月22日递交的中国专利申请第201410219292.8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。 The present application claims the priority of the Chinese Patent Application No. 201410219292.8 filed on May 22, 2014, the entire disclosure of which is hereby incorporated by reference.

Claims (10)

  1. 一种像素电路，包括发光器件和用于为所述发光器件提供驱动电压的驱动模块，其特征在于，还包括：采样模块、补偿模块、以及处理模块；其中，A pixel circuit includes a light emitting device and a driving module for providing a driving voltage for the light emitting device, further comprising: a sampling module, a compensation module, and a processing module; wherein
    所述采样模块的输入端与所述驱动模块的输出端相连，所述采样模块用于对所述驱动模块提供的驱动电压进行采样；An input end of the sampling module is connected to an output end of the driving module, and the sampling module is configured to sample a driving voltage provided by the driving module;
    所述处理模块的输入端与所述采样模块的输出端相连，所述处理模块用于根据所述采样模块采样到的驱动电压，以及预先存储的所述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定与所述驱动电压对应的补偿电压；An input end of the processing module is connected to an output end of the sampling module, the processing module is configured to use a driving voltage sampled according to the sampling module, and a pre-stored brightness of the light emitting device according to a usage time Determining a corresponding voltage with a corresponding voltage to determine a compensation voltage corresponding to the driving voltage;
    所述补偿模块的输入端与所述处理模块的输出端相连，所述补偿模块用于将所述处理模块确定出的补偿电压输入到所述发光器件。An input end of the compensation module is connected to an output end of the processing module, and the compensation module is configured to input a compensation voltage determined by the processing module to the light emitting device.
  2. 如权利要求1所述的像素电路，其特征在于，所述采样模块包括：第一薄膜晶体管和第二薄膜晶体管；其中，The pixel circuit according to claim 1, wherein the sampling module comprises: a first thin film transistor and a second thin film transistor; wherein
    所述第一薄膜晶体管的栅极与采样信号控制端电性相连，所述采样信号控制端用于在采样时间段控制所述采样模块处于导通状态；The gate of the first thin film transistor is electrically connected to the sampling signal control end, and the sampling signal control end is configured to control the sampling module to be in an on state during a sampling period;
    所述第一薄膜晶体管的漏极分别与所述第二薄膜晶体管的源极和所述驱动模块的输出端电性相连；a drain of the first thin film transistor is electrically connected to a source of the second thin film transistor and an output end of the driving module;
    所述第一薄膜晶体管的源极与所述第二薄膜晶体管的栅极电性相连；a source of the first thin film transistor is electrically connected to a gate of the second thin film transistor;
    所述第二薄膜晶体管的漏极与所述处理模块的输入端电性相连。The drain of the second thin film transistor is electrically connected to the input end of the processing module.
  3. 如权利要求2所述的像素电路，其特征在于，所述补偿模块包括：第三薄膜晶体管和第四薄膜晶体管；其中，The pixel circuit according to claim 2, wherein the compensation module comprises: a third thin film transistor and a fourth thin film transistor; wherein
    所述第三薄膜晶体管的栅极与补偿信号控制端电性相连，所述补偿信号控制端用于在补偿时间段控制所述补偿模块处于导通状态；The gate of the third thin film transistor is electrically connected to the compensation signal control end, and the compensation signal control end is configured to control the compensation module to be in an on state during the compensation period;
    所述第三薄膜晶体管的漏极分别与所述第四薄膜晶体管的源极和所述处理模块的输出端电性相连；a drain of the third thin film transistor is electrically connected to a source of the fourth thin film transistor and an output end of the processing module;
    所述第三薄膜晶体管源极与所述第四薄膜晶体管的栅极电性相连；The third thin film transistor source is electrically connected to the gate of the fourth thin film transistor;
    所述第四薄膜晶体管的漏极与所述发光器件输入端电性相连。The drain of the fourth thin film transistor is electrically connected to the input end of the light emitting device.
  4. 如权利要求3所述的像素电路，其特征在于，所述处理模块的输入端 与输出端为同一个端口；The pixel circuit of claim 3 wherein the input of the processing module Same port as the output;
    所述采样信号控制端和所述补偿信号控制端分时驱动对应的所述采样模块和补偿模块处于导通状态。The sampling signal control end and the compensation signal control end time-driven driving the sampling module and the compensation module are in an on state.
  5. 如权利要求4所述的像素电路，其特征在于，还包括：连接于所述采样模块的输出端与所述处理模块的输入端之间、并且连接于所述补偿模块的输入端与所述处理模块的输出端之间的缓存模块；The pixel circuit of claim 4, further comprising: an input coupled between the output of the sampling module and the input of the processing module, and coupled to the input of the compensation module a cache module between the outputs of the processing module;
    所述缓存模块用于缓存所述采样模块采样的驱动电压信号或所述处理模块确定的补偿电压信号。The buffer module is configured to buffer a driving voltage signal sampled by the sampling module or a compensation voltage signal determined by the processing module.
  6. 如权利要求5所述的像素电路，其特征在于，所述缓存模块包括电容，所述电容的一端接地，另一端连接于所述采样模块的输出端与所述处理模块的输入端之间，并且连接于所述补偿模块的输入端与所述处理模块的输出端之间。The pixel circuit according to claim 5, wherein the buffer module comprises a capacitor, one end of the capacitor is grounded, and the other end is connected between an output end of the sampling module and an input end of the processing module. And connected between the input end of the compensation module and the output end of the processing module.
  7. 如权利要求1-6任一项所述的像素电路，其特征在于，所述处理模块包括：The pixel circuit according to any one of claims 1 to 6, wherein the processing module comprises:
    模数转换单元，用于将所述采样模块采样到的驱动电压的模拟信号转换成对应的数字信号；An analog-to-digital conversion unit, configured to convert an analog signal of a driving voltage sampled by the sampling module into a corresponding digital signal;
    存储单元，用于存储预先建立的所述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系；a storage unit, configured to store a correspondence between a change in the light-emitting brightness of the light-emitting device that is established in advance and a driving voltage according to a change in use time;
    确定单元，用于根据所述模数转换单元转换后的数字信号，以及预先存储的所述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定出与所述驱动电压对应的补偿电压的数字信号；a determining unit, configured to determine, according to the digital signal converted by the analog-to-digital conversion unit, and the pre-stored light-emitting luminance of the light-emitting device, corresponding to a change in usage time and a driving voltage, to determine a corresponding to the driving voltage Digital signal of the compensation voltage;
    数模转换单元，用于将所述确定单元确定的补偿电压的数字信号转换成对应的模拟信号。And a digital-to-analog conversion unit, configured to convert the digital signal of the compensation voltage determined by the determining unit into a corresponding analog signal.
  8. 一种显示装置，其特征在于，包括如权利要求1-7任一项所述的像素电路。A display device comprising the pixel circuit according to any one of claims 1-7.
  9. 一种如权利要求1-7任一项所述的像素电路的驱动方法，其特征在于，包括：A method for driving a pixel circuit according to any one of claims 1 to 7, comprising:
    在驱动模块向发光器件输入驱动电压时，采样模块对所述驱动电压进行采样，并在采样信号控制端的控制下将采样到的所述驱动电压输入到处理模块；When the driving module inputs a driving voltage to the light emitting device, the sampling module samples the driving voltage, and inputs the sampled driving voltage to the processing module under the control of the sampling signal control end;
    处理模块根据所述采样模块采样到的所述驱动电压，以及预先存储的所 述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定与所述驱动电压对应的补偿电压，并将所述补偿电压输入到补偿模块；The processing module is configured according to the driving voltage sampled by the sampling module, and a pre-stored Determining a compensation voltage corresponding to the driving voltage according to a corresponding relationship between a change in use time and a driving voltage of the light emitting device, and inputting the compensation voltage to the compensation module;
    所述补偿模块在补偿信号控制端的控制下将所述处理模块确定出的补偿电压输入到所述发光器件。The compensation module inputs the compensation voltage determined by the processing module to the light emitting device under the control of the compensation signal control terminal.
  10. 如权利要求9所述的像素电路的驱动方法，其特征在于，所述处理模块根据所述采样模块采样到的所述驱动电压，以及预先存储的所述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定与所述驱动电压对应的补偿电压，具体包括：The driving method of the pixel circuit according to claim 9, wherein the processing module according to the driving voltage sampled by the sampling module and the pre-stored luminance of the light emitting device according to the use time Determining a compensation voltage corresponding to the driving voltage by determining a corresponding relationship between the driving voltage and the driving voltage, specifically:
    所述处理模块中的模数转换单元将所述采样模块采样到的驱动电压的模拟信号转换成对应的数字信号；An analog-to-digital conversion unit in the processing module converts an analog signal of a driving voltage sampled by the sampling module into a corresponding digital signal;
    所述处理模块中的确定单元根据所述模数转换单元转换后的数字信号，以及预先存储的所述发光器件的发光亮度随着使用时间的变化与驱动电压的对应关系，确定出对所述发光器件进行补偿的补偿电压的数字信号；Determining, by the determining unit, the digital signal converted by the analog-to-digital conversion unit, and the pre-stored corresponding brightness of the light-emitting device of the light-emitting device according to the change of the use time and the driving voltage, determining the a digital signal of a compensation voltage that is compensated by the light emitting device;
    所述处理模块中的数模转换单元将所述确定单元确定的补偿电压的数字信号转换成对应的模拟信号。 The digital-to-analog conversion unit in the processing module converts the digital signal of the compensation voltage determined by the determining unit into a corresponding analog signal.
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