WO2023065425A1 - 显示面板及其亮度补偿方法 - Google Patents

显示面板及其亮度补偿方法 Download PDF

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Publication number
WO2023065425A1
WO2023065425A1 PCT/CN2021/130067 CN2021130067W WO2023065425A1 WO 2023065425 A1 WO2023065425 A1 WO 2023065425A1 CN 2021130067 W CN2021130067 W CN 2021130067W WO 2023065425 A1 WO2023065425 A1 WO 2023065425A1
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WIPO (PCT)
Prior art keywords
sub
thin film
film transistor
brightness
pixel units
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Application number
PCT/CN2021/130067
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English (en)
French (fr)
Inventor
付昭鸿
罗心颖
高国卿
王怀玉
Original Assignee
惠州华星光电显示有限公司
深圳市华星光电半导体显示技术有限公司
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Application filed by 惠州华星光电显示有限公司, 深圳市华星光电半导体显示技术有限公司 filed Critical 惠州华星光电显示有限公司
Priority to US17/615,154 priority Critical patent/US20230122765A1/en
Publication of WO2023065425A1 publication Critical patent/WO2023065425A1/zh

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

Definitions

  • the invention relates to the field of display technology, in particular to a display panel and a brightness compensation method thereof.
  • OLEDs Organic light-emitting display diodes
  • PMOLED Passive Matrix OLED
  • active matrix OLED AMOLED
  • direct addressing AMOLED
  • thin film transistor TFT
  • PMOLED passive matrix organic light-emitting display
  • PMOLED increases with the display size , requires a shorter driving time of a single pixel, so it is necessary to increase the transient current and increase the power consumption.
  • the active matrix organic light-emitting display can solve these problems well by scanning the switching tubes to input OLED current row by row.
  • AMOLED display panel also suffers from the current difference caused by the uneven process of the thin film transistor or the threshold voltage drift, and the IR caused by the capacitive resistance load of the backplane power line. drop, and the uneven electrical characteristics caused by the uneven film thickness during the evaporation of OLED light-emitting devices, resulting in differences in the brightness of each pixel, showing uneven display (mura) or afterimage phenomenon. Therefore, AMOLED display panels generally integrate an optical compensation system for measuring the brightness of each pixel to adjust the brightness of each pixel to be consistent. However, in the current optical compensation system, each optical sensor corresponds to only one sub-pixel unit. As the size of the display panel increases, the number of pixels increases sharply, which will lead to a sharp increase in the required optical sensors, making the manufacturing process of the display panel complex and increasing the cost.
  • each optical sensor corresponds to only one sub-pixel unit.
  • the number of pixels increases sharply, which will lead to a sharp increase in the required optical sensors, making the manufacturing process of the display panel complex. Increased costs.
  • an embodiment of the present invention provides a display panel and a brightness compensation method thereof.
  • an embodiment of the present invention provides a display panel, the display panel includes a plurality of pixel units arranged in an array, each of the pixel units includes a plurality of sub-pixel units, and the display panel further includes a sensing unit, each A plurality of the sub-pixel units in the pixel units are respectively connected to the same sensing unit; each sensing unit is used to measure the actual value of each of the sub-pixel units in the corresponding pixel unit brightness, and perform brightness compensation on each of the sub-pixel units according to the actual brightness, so that each of the sub-pixel units reaches a target brightness.
  • each of the sub-pixel units includes a first thin film transistor, a second thin film transistor, a third thin film transistor, a first storage capacitor and an organic light emitting diode; the gates of the first thin film transistors are respectively connected to the The drain of the second thin film transistor is connected to the first end of the first storage capacitor, the source of the first thin film transistor is connected to the positive pole of the power supply, and the drain of the first thin film transistor is connected to the first terminal of the first storage capacitor.
  • the sensing unit includes a fourth thin film transistor, a photodiode and a second storage capacitor, the gate of the fourth thin film transistor is connected to the second scan line, and the drain of the fourth thin film transistor is connected to In the sensing line, the source of the fourth thin film transistor is connected to the drain of the third thin film transistor of each sub-pixel unit corresponding to the sensing unit, and the drain of the fourth thin film transistor The first end of the photodiode is connected, the second end of the photodiode is connected to the control line, and the first end of the second storage capacitor is connected to the sensing line.
  • the sensing unit includes a compensation module, the compensation module is connected to the second end of the second storage capacitor, and the compensation module is used to adjust the The data line provides the data voltage to the sub-pixel unit, so that the sub-pixel unit reaches the target brightness.
  • the organic light emitting diode includes an organic light emitting layer
  • the photosensitive diode is disposed between the organic light emitting layer and the thin film transistor array, and the organic light emitting layer emits light to the photosensitive diode.
  • the display panel is an OLED display panel.
  • an embodiment of the present invention further provides a brightness compensation method for a display panel, including:
  • the display panel performs preset display intervals of frame images, so that a plurality of sub-pixel units in each pixel unit emit light sequentially, and measure the actual temperature of each of the sub-pixel units in the corresponding pixel unit through the sensing unit.
  • the sensing unit performs brightness compensation on each of the sub-pixel units according to the actual brightness of each of the sub-pixel units, so that each of the sub-pixel units reaches a target brightness.
  • the making multiple sub-pixel units in each pixel unit emit light sequentially, and measuring the actual brightness of each of the sub-pixel units in the corresponding pixel unit through the sensing unit specifically includes:
  • One of the sub-pixels of each pixel unit is sequentially made to emit light, and the actual brightness of one of the sub-pixels is measured through the sensing unit corresponding to the pixel unit.
  • the passing sensing unit performs brightness compensation on each of the sub-pixel units according to the actual brightness of each of the sub-pixel units, so that each of the sub-pixel units reaches a target brightness, specifically including:
  • the display panel displays each frame of image, specifically including:
  • the first scan line is turned on, so that the second thin film transistor and the third thin film transistor are turned on, so as to reset the potentials of the first terminal and the second terminal of the first storage capacitor;
  • the coupling effect of the first storage capacitor is used to keep the first thin-film transistor turned on, and the organic light-emitting diode is made to emit light through the positive electrode of the power supply.
  • the measuring the actual brightness of each of the sub-pixel units in the corresponding pixel unit through the sensing unit further includes:
  • the sensing phase is performed after the light-emitting phase, the first scan line is turned off, so that the second thin film transistor and the third thin film transistor are turned off; the second scan line is turned on, so that the fourth thin film transistor is turned on,
  • the sensing unit is used to measure the actual brightness of each sub-pixel unit in the corresponding pixel unit.
  • an embodiment of the present invention further provides a display panel, including a plurality of pixel units arranged in an array, each of which includes a plurality of sub-pixel units, wherein the display panel further includes a sensing unit, each A plurality of the sub-pixel units in the pixel units are respectively connected to the same sensing unit;
  • Each of the sensing units is used to measure the actual brightness of each of the sub-pixel units in the corresponding pixel unit, and perform brightness compensation on each of the sub-pixel units according to the actual brightness, so that each of the The sub-pixel unit reaches the target brightness;
  • the sensing unit includes a photosensitive diode, and each sub-pixel unit includes an organic light emitting diode and a plurality of thin film transistors, the organic light emitting diode includes an organic light emitting layer, and a plurality of the thin film transistors form a thin film transistor array, wherein the photosensitive diode It is arranged between the organic light emitting layer and the thin film transistor array, and the organic light emitting layer emits light to the photosensitive diode.
  • each of the sub-pixel units includes a first thin film transistor, a second thin film transistor, a third thin film transistor, a first storage capacitor and an organic light emitting diode;
  • the gate of the first thin film transistor is respectively connected to the drain of the second thin film transistor and the first end of the first storage capacitor, the source of the first thin film transistor is connected to the positive electrode of the power supply, and the first thin film transistor
  • the drain of the transistor is connected to the second end of the first storage capacitor, the anode of the organic light emitting diode and the source of the third thin film transistor, the cathode of the organic light emitting diode is connected to the negative electrode of the power supply, and the second thin film
  • the gate of the transistor and the gate of the third thin film transistor are connected to the first scanning line, the source of the second thin film transistor is connected to the data line, and the drain of the third thin film transistor is connected to the sensing line.
  • the sensing unit includes a fourth thin film transistor, a photodiode and a second storage capacitor, the gate of the fourth thin film transistor is connected to the second scan line, and the drain of the fourth thin film transistor is connected to The sensing line, the source of the fourth thin film transistor is connected to the first end of the photodiode, the second end of the photodiode is connected to the control line, and the first end of the second storage capacitor is connected to the sensing line.
  • the sensing unit further includes a compensation module, the compensation module is connected to the second end of the second storage capacitor, and the compensation module is used to adjust the sub-pixel unit according to the actual brightness of the sub-pixel unit The data voltage provided by the data line to the sub-pixel unit, so that the sub-pixel unit reaches the target brightness.
  • the brightness compensation process of the display panel includes:
  • the display panel performs preset display intervals of frame images, so that a plurality of sub-pixel units in each pixel unit emit light sequentially, and measure the actual temperature of each of the sub-pixel units in the corresponding pixel unit through the sensing unit.
  • the sensing unit performs brightness compensation on each of the sub-pixel units according to the actual brightness of each of the sub-pixel units, so that each of the sub-pixel units reaches a target brightness.
  • the making multiple sub-pixel units in each pixel unit emit light sequentially, and measuring the actual brightness of each of the sub-pixel units in the corresponding pixel unit through the sensing unit specifically includes:
  • One of the sub-pixels of each pixel unit is sequentially made to emit light, and the actual brightness of one of the sub-pixels is measured through the sensing unit corresponding to the pixel unit.
  • the passing sensing unit performs brightness compensation on each of the sub-pixel units according to the actual brightness of each of the sub-pixel units, so that each of the sub-pixel units reaches a target brightness, specifically including:
  • the display panel displays each frame of image, specifically including:
  • the first scan line is turned on, so that the second thin film transistor and the third thin film transistor are turned on, so as to reset the potentials of the first terminal and the second terminal of the first storage capacitor;
  • the coupling effect of the first storage capacitor is used to keep the first thin-film transistor turned on, and the organic light-emitting diode is made to emit light through the positive electrode of the power supply.
  • the measuring the actual brightness of each of the sub-pixel units in the corresponding pixel unit through the sensing unit further includes:
  • the sensing phase is performed after the light-emitting phase, the first scan line is turned off, so that the second thin film transistor and the third thin film transistor are turned off; the second scan line is turned on, so that the fourth thin film transistor is turned on,
  • the sensing unit is used to measure the actual brightness of each sub-pixel unit in the corresponding pixel unit.
  • multiple sub-pixel units in each pixel unit of the display panel share the same sensing unit, and the normal display process and optical detection process of each pixel unit are separately performed.
  • the multiple sub-pixel units in each pixel unit emit light sequentially, and at the same time measure the actual brightness of the multiple sub-pixel units in the pixel unit through the sensing unit corresponding to the pixel unit, and Compensate the brightness of each sub-pixel unit according to the actual brightness, so that each sub-pixel unit reaches the target brightness, so that the brightness of each sub-pixel unit reaches the target brightness, that is, the brightness of each area of the display panel is uniform, so OLED display Due to the inconsistency of the mobility of the driving transistors or the drift of the threshold voltage of the panel, or the aging of the organic light-emitting diode OLED, the phenomenon of display unevenness or afterimages, etc., when it is necessary to perform optical compensation on the display panel
  • FIG. 1 is a schematic structural diagram of a display panel in the prior art
  • FIG. 2 is a schematic structural diagram of a display panel provided by an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a sub-pixel unit and a sensing unit of a display panel provided by an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a sensing unit provided by an embodiment of the present invention.
  • FIG. 5 is a schematic cross-sectional view of a display panel provided by an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a pixel unit and a sensing unit of a display panel provided by an embodiment of the present invention
  • FIG. 7 is an overall flowchart of a brightness compensation method for a display panel provided by an embodiment of the present invention.
  • the current AMOLED panels usually use a voltage-type driving method to drive the display.
  • the driver IC provides a voltage signal representing the gray scale, and the voltage signal will be converted into a current signal of the driving transistor in the pixel circuit to drive the organic light-emitting diode OLED to realize Brightness grayscale, this method has the advantages of fast driving speed and simple implementation process, and is suitable for driving large-size display panels.
  • IR due to capacitive load issues such as drop and non-uniformity of organic light-emitting diodes (OLEDs).
  • Fig. 1 is a schematic structural diagram of a display panel in the prior art.
  • the current AMOLED display panel generally integrates an optical compensation system
  • the display panel includes a plurality of pixel units 10 arranged in an array, and each pixel unit 10 includes A plurality of sub-pixel units 101 (the sub-pixel units 101 included in each pixel unit 10 may be a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B), and each sub-pixel unit 101 is provided with a light-emitting device such as an organic light-emitting diode OLED.
  • a light-emitting device such as an organic light-emitting diode OLED.
  • the display panel sends the display data of each sub-pixel unit 101 to the timing controller, and the timing controller converts the display data into a voltage signal and outputs it to the source driver, and the source driver provides the data voltage Vdata through the data line Data, Each sub-pixel unit 101 is made to display.
  • the optical compensation system obtains the actual brightness of the organic light-emitting diode (OLED) of each sub-pixel unit 101 by using an optical lens and a brightness measuring instrument, and performs data calculation on the actual brightness and the target brightness to obtain compensation data
  • the compensation data is stored in the source driver chip, so that the source driver adjusts the brightness of each sub-pixel unit 101 by adjusting the data voltage Vdata provided by the data line Data, so that the brightness of each sub-pixel unit 101 reaches the target brightness.
  • each optical sensor 1 corresponds to only one sub-pixel unit 101. As the size of the display panel increases, the number of pixels increases sharply, which will lead to a sharp increase in the required optical sensors 1, making the manufacturing of the display panel The process is complicated and the cost increases.
  • FIG. 2 is a schematic structural diagram of a display panel provided by an embodiment of the present invention.
  • the units 101 are respectively connected to the same sensing unit 102; each sensing unit 102 is used to measure the actual brightness of each sub-pixel unit 101 in the corresponding pixel unit 10, and perform brightness compensation for each sub-pixel unit 101 according to the actual brightness, In order to make each sub-pixel unit 101 reach the target brightness.
  • the target brightness refers to the brightness that each sub-pixel unit 101 needs to achieve according to the data signal provided by the data line Data.
  • the sensing unit 102 may be an optical sensor for measuring the brightness of each sub-pixel unit 101 .
  • multiple sub-pixel units 101 in each pixel unit 10 share the same sensing unit 102, and the normal display process and optical detection process of each pixel unit 10 are performed separately, and each pixel unit 10 After performing normal display, the multiple sub-pixel units 101 in each pixel unit 10 are made to emit light sequentially, and at the same time, the actual brightness of each sub-pixel unit 101 in the pixel unit is measured through the corresponding sensing unit 102 of the pixel unit, and according to The actual brightness compensates the brightness of each sub-pixel unit 101, so that each sub-pixel unit 101 reaches the target brightness, so that the brightness of each sub-pixel unit 101 reaches the target brightness, that is, the brightness of each area of the display panel is uniform.
  • the number of sensing units 102 can simplify the manufacturing process of the display panel and reduce the cost.
  • FIG. 3 is a schematic structural diagram of the sub-pixel unit 101 and the sensing unit 102 of the display panel provided by the embodiment of the present invention.
  • FIG. 3 shows an exemplary sub-pixel unit 101 and the sensing unit 102. structure, each sub-pixel unit 101 includes a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, a first storage capacitor C1 and an organic light emitting diode OLED, wherein the gate of the first thin film transistor T1 is respectively connected to the second The drain of the two thin film transistors T2 and the first end of the first storage capacitor C1, the source of the first thin film transistor T1 is connected to the positive power supply VDD, the drain of the first thin film transistor T1 is connected to the second end of the first storage capacitor C1, The anode of the organic light emitting diode OLED and the source of the third thin film transistor T3, the cathode of the organic light emitting diode OLED is connected to the negative electrode VSS of the power supply, the gate
  • the sensing unit 102 includes a fourth thin film transistor T4, a photodiode PIN and a second storage capacitor C2, the gate of the fourth thin film transistor T4 is connected to the second scanning line Scan2, and the drain of the fourth thin film transistor T4 connected to the sensing line Sense, the source of the fourth thin film transistor T4 is connected to the drain of the third thin film transistor T3 of each sub-pixel unit 101 corresponding to the sensing unit 102, and the drain of the fourth thin film transistor T4 is connected to the pin of the photodiode PIN
  • the first end, the second end of the photodiode PIN is connected to the control line V0 (the control line V0 makes the photodiode PIN in a reverse bias state), and the first end of the second storage capacitor C2 is connected to the sensing line Sense.
  • every two adjacent sub-pixel units 101 in the same row can be mirrored, as shown in FIG. 6 , so that every two adjacent sub-pixel units 101 in the same row can share the same The sensing line Sense, to reduce the number of sensing lines Sense.
  • FIG. 4 is a specific structural schematic diagram of the sensing unit 102 provided by the embodiment of the present invention. As shown in FIG. 4 , the sensing unit 102 also includes an operational amplifier 103, and the operational amplifier 103 and the second storage capacitor C2 are connected in parallel to form an integral amplification circuit.
  • the integral amplifier circuit converts the current formed by the charge generated by the photodiode PIN into a voltage signal, and inputs the voltage signal to the timing controller, According to the voltage signal, the timing controller controls the source driver to adjust the data voltage Vdata provided by the data line Data to the sub-pixel unit 101 when the sub-pixel unit 101 is displaying, so as to compensate the brightness of each sub-pixel unit 101, so that each sub-pixel unit 101 brightness reaches the target brightness.
  • the sensing unit further includes a compensation module 104, the compensation module 104 is connected to the second end of the second storage capacitor C2, and the compensation module 104 is used to adjust the data line Data according to the actual brightness of the sub-pixel unit 101.
  • the data voltage Vdata is provided to the sub-pixel unit 101 to make the sub-pixel unit 101 reach the target brightness.
  • the compensation module 104 is connected with the source driver and transmits the compensation data to the source driver, and the source driver adjusts the data voltage Vdata provided by the data line Data.
  • the OLED display panel includes a substrate, a thin film transistor array, an anode, an organic light-emitting layer, a cathode, and an encapsulation layer sequentially from bottom to top, wherein , the anode, the organic light-emitting layer and the cathode form an organic light-emitting diode (OLED).
  • OLED organic light-emitting diode
  • the photosensitive diode PIN is disposed between the organic light emitting layer and the thin film transistor array, and the organic light emitting diode OLED adopts a bottom emission mode, and the organic light emitting layer emits light downward to the photosensitive diode PIN.
  • the photosensitive diode PIN of the sensing unit 102 is arranged between the organic light-emitting layer of the organic light-emitting diode OLED and the thin-film transistor array, so that the organic light-emitting diode OLED adopts a bottom emission method to emit light from the organic light-emitting layer.
  • Part of the light is set to the photodiode PIN, so that the photodiode PIN detects the luminous intensity of the organic light emitting diode OLED, that is, the actual brightness of the sub-pixel unit 101 .
  • the photodiode PIN of the sensing unit 102 is arranged on the organic light-emitting layer and the organic light-emitting layer of the organic light-emitting diode OLED. Between the thin film transistor arrays, the photosensitive area can be increased, and the photosensitive effect can be greatly improved.
  • FIG. 7 is an overall flow chart of a brightness compensation method for a display panel provided by an embodiment of the present invention. As shown in FIG. 7, an embodiment of the present invention also provides a brightness compensation method for a display panel, including:
  • the display panel when it displays each frame of image, it includes the normal display period (Vactive) and the vertical blanking period (Vblank). Return the lower corner to the upper left corner of the image, and start scanning a new frame, this time interval.
  • the normal display process and the optical detection process of each pixel unit are performed separately, and the optical detection process is performed during the field blanking period.
  • each sensing unit 102 is used to measure all sub-pixel units in a corresponding pixel unit 101
  • the sensing unit 102 measures the actual brightness of a sub-pixel unit 101
  • only the sub-pixel unit 101 in the pixel unit where the sub-pixel unit 101 is located emits light
  • the sub-pixel unit 101 The other sub-pixel units 101 in the pixel unit do not emit light, so that the sensing unit 102 can accurately sense the actual brightness of the sub-pixel unit 101 . Since each vertical blanking period is relatively short, generally only one sub-pixel unit 101 can be sensed.
  • each pixel unit includes N sub-pixel units 101 (N is a positive integer), it needs to be detected in at least N frames of images.
  • the display gap is N field blanking periods, so that the N sub-pixel units 101 in each pixel unit emit light sequentially, and the actual brightness of the N sub-pixel units 101 in the corresponding pixel unit is measured by the sensing unit 102, thereby measuring Calculate the actual luminance of all sub-pixel units 101, then compare the actual luminance of all sub-pixels with their target luminance, and finally add the difference between the target luminance and the actual luminance as compensation data to the data signal of the next normal display period, so that
  • the data signal for adjusting the next frame of image for display that is, the data signal of each frame of image in the normal display stage is obtained by superimposing the actual brightness and the difference between the target brightness and the actual brightness.
  • the brightness compensation method of the display panel separates the normal display process and the optical detection process of each pixel unit, and after each pixel unit performs normal display, the multiple sub-pixel units 101 in each pixel unit are sequentially At the same time, measure the actual brightness of multiple sub-pixel units 101 in the pixel unit through the sensing unit 102 corresponding to the pixel unit, and perform brightness compensation for each sub-pixel unit 101 according to the actual brightness, so that each sub-pixel unit 101 reaches the target brightness, so that the brightness of each sub-pixel unit 101 reaches the target brightness, that is, the brightness of each area of the display panel is uniform, thereby reducing the mobility of the OLED display panel due to inconsistent mobility or threshold voltage drift of each driving transistor, or It is the phenomenon of display unevenness or residual image caused by the aging of the organic light-emitting diode OLED.
  • step S1 the multiple sub-pixel units 101 in each pixel unit are made to emit light sequentially, and the actual brightness of each sub-pixel unit 101 in the corresponding pixel unit is measured through the sensing unit 102, specifically including: One of the sub-pixel units 101 of each pixel unit is made to emit light, and the actual brightness of one of the sub-pixel units 101 is measured through the sensing unit 102 corresponding to the pixel unit.
  • step S2 brightness compensation is performed on each sub-pixel unit 101 according to the actual brightness of each sub-pixel unit 101 through the sensing unit 102, so that each sub-pixel unit 101 reaches the target brightness, specifically including: through compensation
  • the module 104 calculates the difference between the actual brightness of each sub-pixel unit 101 and the target brightness, and adjusts the data voltage Vdata provided by the data line Data to each sub-pixel unit 101, so that the actual brightness of each sub-pixel unit 101 reaches the target brightness.
  • step S1 the display panel displays each frame of image, specifically including:
  • the first scan line Scan1 is turned on, so that the second thin film transistor T2 and the third thin film transistor T3 are turned on, so as to reset the potentials of the first end and the second end of the first storage capacitor C1;
  • the coupling effect of the first storage capacitor C1 is used to keep the first thin-film transistor T1 turned on, and the organic light-emitting diode OLED emits light through the positive power supply VDD.
  • the normal display period of each frame of image includes a reset phase, a writing phase, and a light-emitting phase.
  • the data line Data and the sensing line Sense respectively reset the potentials of the first terminal and the second terminal of the first storage capacitor C1 to 0; then in the writing phase, the data signal is written by the data line Data through the second thin film transistor T2 to Make the first thin film transistor T1 open and charge the first storage capacitor C1; in the light-emitting stage, the positive pole of the power supply VDD makes the organic light emitting diode OLED emit light through the first thin film transistor T1.
  • the gate-to-source voltage difference Vgs of the first thin film transistor T1 can be kept constant, so that the first thin film transistor T1 remains turned on.
  • step S1 the actual brightness of each sub-pixel unit 101 in the corresponding pixel unit 10 is measured by the sensing unit 102, and further includes: performing a sensing phase after the light-emitting phase, the first scanning line Scan1 is turned off, The second thin film transistor T2 and the third thin film transistor T3 are turned off; the second scanning line Scan2 is turned on, and the fourth thin film transistor T4 is turned on, so as to use the sensing unit 102 to measure the actual brightness of each sub-pixel unit 101 in the corresponding pixel unit .
  • the sensing phase is performed, and the first scanning line Scan1 is turned off, so that the second thin film transistor T2 and the third thin film transistor T3 are turned off, and the second thin film transistor T2 is turned off.
  • the second scanning line Scan2 is turned on, so that the fourth thin film transistor T4 is turned on, so as to use the sensing unit 102 to measure the actual brightness of each sub-pixel unit 101 in the corresponding pixel unit, if each field blanking period can only measure each pixel unit
  • the actual brightness of one sub-pixel unit 101 in each pixel unit when each pixel unit includes N sub-pixel units 101 (N is a positive integer), it needs to display intervals of at least N frames of images, that is, N field blanking periods, so that each The N sub-pixel units 101 in the unit emit light sequentially, and the actual brightness of the N sub-pixel units 101 in the corresponding pixel unit is measured by the sensing unit 102 , thereby measuring the actual brightness of all the sub-pixel units 101 .
  • FIG. 6 is a schematic structural diagram of a pixel unit and a sensing unit 102 of a display panel provided by an embodiment of the present invention.
  • each pixel unit includes red sub-pixels, green sub-pixels, blue Taking the color sub-pixel and white sub-pixel as an example, the working process of the brightness compensation method is explained in detail, wherein, the red sub-pixel and the green sub-pixel are in the same row, the blue sub-pixel and the white sub-pixel are in the same row, and the red sub-pixel and the blue sub-pixel are in the same row.
  • the color sub-pixels are in the same column, and the green sub-pixels and white sub-pixels are in the same column.
  • the sub-pixel units 101 located in the same row share the same scan line
  • the sub-pixel units 101 located in the same column share the same data line Data.
  • any four frame images It can be a continuous 4-frame image, or an intermittent 4-frame image) during the vertical blanking period after the normal display period, and the red sub-pixel, green sub-pixel, green sub-pixel, and The actual brightness of the blue sub-pixel and the white sub-pixel, and perform brightness compensation on each sub-pixel unit 101 according to the actual brightness, so that each sub-pixel unit 101 reaches the target brightness.
  • the red sub-pixel in each pixel unit is allowed to emit light, while the green sub-pixel, blue sub-pixel and white sub-pixel are not emitting light, and the sensing unit 102 is used to measure the red sub-pixel The actual brightness, and compare the actual brightness with the data voltage Vdata provided by the data line Data to the red sub-pixel in the normal display period of the current frame image to make the red sub-pixel reach the target brightness, and calculate the difference between the actual brightness and the target brightness Therefore, the data signal that the image data line Data of the next frame needs to provide to the red sub-pixel is adjusted according to the difference, so that the actual brightness of the red sub-pixel reaches the target brightness.
  • the sensing unit 102 can measure the actual brightness of the sub-pixel units 101 of the same color in each pixel unit, and can also measure the sub-pixels of different colors in each pixel unit. As for the actual brightness of the pixel unit 101 , it is sufficient to measure the actual brightness of each sub-pixel unit 101 in a plurality of vertical blanking periods.

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Abstract

一种显示面板及其亮度补偿方法，每个像素单元(10)中的多个子像素单元(101)共用同一个感测单元(102)，且将每个像素单元(10)的正常显示过程和光学检测过程分开进行，从而使各个子像素单元(101)的亮度均达到目标亮度，由此减少了光学补偿***中感测单元(102)的数量，从而简化显示面板的制造工艺，降低成本。

Description

显示面板及其亮度补偿方法 技术领域
本发明涉及显示技术领域，尤其涉及一种显示面板及其亮度补偿方法。
 背景技术
有机发光显示二极管（OLED）作为一种电流型发光器件已越来越多地被应用于高性能显示中，OLED按照驱动方式可以分为无源矩阵型(Passive Matrix OLED，PMOLED)和有源矩阵型(Active Matrix OLED，AMOLED)两大类，即直接寻址和薄膜晶体管(Thin Film Transistor，TFT)矩阵寻址两类，其中，无源矩阵有机发光显示（PMOLED）随着显示尺寸的增大，需要更短的单个像素的驱动时间，因而需要增大瞬态电流，增加功耗，同时大电流的应用会造成ITO线上压降过大，并使OLED工作电压过高，进而降低其效率。而有源矩阵有机发光显示（AMOLED）通过开关管逐行扫描输入OLED电流，可以很好地解决这些问题。
然而，AMOLED显示面板也会由于薄膜晶体管的工艺不均匀或阈值电压漂移导致的电流差异、背板电源线的电容电阻负载导致的IR drop，以及OLED发光器件蒸镀时的膜厚不均导致的电学特性不均匀，使得各个像素的亮度出现差异，呈现显示不均匀（mura）或残影现象。因此，AMOLED显示面板一般集成了光学补偿***，用于测量各像素的亮度，以将各像素的亮度调整为一致，但是，目前的光学补偿***中，每个光学传感器仅对应一个子像素单元，随着显示面板尺寸的增大，像素数量急剧增加，会导致所需的光学传感器急剧增加，使得显示面板的制造工艺复杂、成本增加。
因此，目前亟需一种显示面板及其亮度补偿方法，以尽量减少光学补偿***中光学传感器的数量，从而简化显示面板的制造工艺，降低成本。
 技术问题
目前的光学补偿***中，每个光学传感器仅对应一个子像素单元，随着显示面板尺寸的增大，像素数量急剧增加，会导致所需的光学传感器急剧增加，使得显示面板的制造工艺复杂、成本增加。
 技术解决方案
为了解决上述问题，本发明实施例提供一种显示面板及其亮度补偿方法。
第一方面，本发明实施例提供一种显示面板，该显示面板包括多个阵列排布的像素单元，每个所述像素单元包括多个子像素单元，所述显示面板还包括感测单元，每个所述像素单元中的多个所述子像素单元分别连接同一个所述感测单元；每个所述感测单元用于测量对应的所述像素单元中的各个所述子像素单元的实际亮度，并根据所述实际亮度对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度。
在一些实施例中，每个所述子像素单元包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第一存储电容和有机发光二极管；所述第一薄膜晶体管的栅极分别连接所述第二薄膜晶体管的漏极和所述第一存储电容的第一端，所述第一薄膜晶体管的源极连接电源正极，所述第一薄膜晶体管的漏极连接所述第一存储电容的第二端、所述有机发光二极管的阳极以及所述第三薄膜晶体管的源极，所述有机发光二极管的阴极连接电源负极，所述第二薄膜晶体管的栅极和第三薄膜晶体管的栅极连接第一扫描线，所述第二薄膜晶体管的源极连接数据线，所述第三薄膜晶体管的漏极连接感测线。
在一些实施例中，所述感测单元包括第四薄膜晶体管、光敏二极管和第二存储电容，所述第四薄膜晶体管的栅极连接第二扫描线，所述第四薄膜晶体管的漏极连接所述感测线，所述第四薄膜晶体管的源极连接该所述感测单元对应的各个所述子像素单元的所述第三薄膜晶体管的漏极，所述第四薄膜晶体管的漏极连接所述光敏二极管的第一端，所述光敏二极管的第二端连接控制线，所述第二存储电容的第一端连接所述感测线。
在一些实施例中，所述感测单元包括补偿模块，所述补偿模块连接所述第二存储电容的第二端，所述补偿模块用于根据所述子像素单元的实际亮度，调整所述数据线向该所述子像素单元提供的数据电压，以使得所述子像素单元达到所述目标亮度。
在一些实施例中，所述有机发光二极管包括有机发光层，所述光敏二极管设于所述有机发光层和薄膜晶体管阵列之间，所述有机发光层出射光线至所述光敏二极管。
在一些实施例中，所述显示面板为OLED显示面板。
第二方面，本发明实施例还提供一种显示面板的亮度补偿方法，包括：
在所述显示面板进行预设帧图像的显示间隙，使每个像素单元中的多个子像素单元依次发光，并通过感测单元测量对应的所述像素单元中的各个所述子像素单元的实际亮度；
通过感测单元根据各个所述子像素单元的实际亮度，对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度。
在一些实施例中，所述使每个像素单元中的多个子像素单元依次发光，并通过感测单元测量对应的像素单元中的各个所述子像素单元的实际亮度，具体包括：
依次使每个所述像素单元的其中一个所述子像素发光，并通过该所述像素单元对应的所述感测单元测量其中一个所述子像素的实际亮度。
在一些实施例中，所述通过感测单元根据各个所述子像素单元的实际亮度，对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度，具体包括：
通过补偿模块计算各个所述子像素单元的实际亮度与目标亮度的差值，并调整数据线向各个所述子像素单元提供的数据电压，使各个所述子像素单元的实际亮度达到所述目标亮度。
在一些实施例中，所述显示面板进行每帧图像的显示，具体包括：
在复位阶段，第一扫描线打开，使第二薄膜晶体管和第三薄膜晶体管打开，以复位第一存储电容的第一端和第二端的电位；
在写入阶段，通过数据线写入数据信号，使第一薄膜晶体管打开，并向所述第一存储电容充电；
在发光阶段，利用所述第一存储电容的耦合效应，使所述第一薄膜晶体管保持打开，并通过电源正极使有机发光二极管发光。
在一些实施例中，所述通过感测单元测量对应的像素单元中的各个所述子像素单元的实际亮度，还包括：
在所述发光阶段之后进行感测阶段，所述第一扫描线关闭，使所述第二薄膜晶体管和所述第三薄膜晶体管关闭；所述第二扫描线打开，使第四薄膜晶体管打开，以利用感测单元测量对应的所述像素单元中的各个所述子像素单元的实际亮度。
第三方面，本发明实施例还提供一种显示面板，包括多个阵列排布的像素单元，每个所述像素单元包括多个子像素单元，其中，所述显示面板还包括感测单元，每个所述像素单元中的多个所述子像素单元分别连接同一个所述感测单元；
每个所述感测单元用于测量对应的所述像素单元中的各个所述子像素单元的实际亮度，并根据所述实际亮度对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度；
所述感测单元包括光敏二极管，每个子像素单元包括有机发光二极管和多个薄膜晶体管，所述有机发光二极管包括有机发光层，多个所述薄膜晶体管形成薄膜晶体管阵列，其中，所述光敏二极管设于所述有机发光层和所述薄膜晶体管阵列之间，且所述有机发光层出射光线至所述光敏二极管。
在一些实施例中，每个所述子像素单元包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第一存储电容和有机发光二极管；
所述第一薄膜晶体管的栅极分别连接所述第二薄膜晶体管的漏极和所述第一存储电容的第一端，所述第一薄膜晶体管的源极连接电源正极，所述第一薄膜晶体管的漏极连接所述第一存储电容的第二端、所述有机发光二极管的阳极以及所述第三薄膜晶体管的源极，所述有机发光二极管的阴极连接电源负极，所述第二薄膜晶体管的栅极和第三薄膜晶体管的栅极连接第一扫描线，所述第二薄膜晶体管的源极连接数据线，所述第三薄膜晶体管的漏极连接感测线。
在一些实施例中，所述感测单元包括第四薄膜晶体管、光敏二极管和第二存储电容，所述第四薄膜晶体管的栅极连接第二扫描线，所述第四薄膜晶体管的漏极连接所述感测线，所述第四薄膜晶体管的源极连接所述光敏二极管的第一端，所述光敏二极管的第二端连接控制线，所述第二存储电容的第一端连接所述感测线。
在一些实施例中，所述感测单元还包括补偿模块，所述补偿模块连接所述第二存储电容的第二端，所述补偿模块用于根据所述子像素单元的实际亮度，调整所述数据线向该所述子像素单元提供的数据电压，以使得所述子像素单元达到所述目标亮度。
在一些实施例中，所述显示面板的亮度补偿过程包括：
在所述显示面板进行预设帧图像的显示间隙，使每个像素单元中的多个子像素单元依次发光，并通过感测单元测量对应的所述像素单元中的各个所述子像素单元的实际亮度；
通过所述感测单元根据各个所述子像素单元的实际亮度，对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度。
在一些实施例中，所述使每个像素单元中的多个子像素单元依次发光，并通过感测单元测量对应的像素单元中的各个所述子像素单元的实际亮度，具体包括：
依次使每个所述像素单元的其中一个所述子像素发光，并通过该所述像素单元对应的所述感测单元测量其中一个所述子像素的实际亮度。
在一些实施例中，所述通过感测单元根据各个所述子像素单元的实际亮度，对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度，具体包括：
通过补偿模块计算各个所述子像素单元的实际亮度与目标亮度的差值，并调整数据线向各个所述子像素单元提供的数据电压，使各个所述子像素单元的实际亮度达到所述目标亮度。
在一些实施例中，所述显示面板进行每帧图像的显示，具体包括：
在复位阶段，第一扫描线打开，使第二薄膜晶体管和第三薄膜晶体管打开，以复位第一存储电容的第一端和第二端的电位；
在写入阶段，通过数据线写入数据信号，使第一薄膜晶体管打开，并向所述第一存储电容充电；
在发光阶段，利用所述第一存储电容的耦合效应，使所述第一薄膜晶体管保持打开，并通过电源正极使有机发光二极管发光。
在一些实施例中，所述通过感测单元测量对应的像素单元中的各个所述子像素单元的实际亮度，还包括：
在所述发光阶段之后进行感测阶段，所述第一扫描线关闭，使所述第二薄膜晶体管和所述第三薄膜晶体管关闭；所述第二扫描线打开，使第四薄膜晶体管打开，以利用感测单元测量对应的所述像素单元中的各个所述子像素单元的实际亮度。
 有益效果
本发明实施例提供的显示面板及其亮度补偿方法中，显示面板的每个像素单元中的多个子像素单元共用同一个感测单元，将每个像素单元的正常显示过程和光学检测过程分开进行，在各个像素单元进行正常显示之后，使每个像素单元中的多个子像素单元依次发光，同时通过该像素单元对应的感测单元分别测量该像素单元中的多个子像素单元的实际亮度，并根据所实际亮度对各个子像素单元进行亮度补偿，以使得各个子像素单元达到目标亮度，从而使各个子像素单元的亮度均达到目标亮度，即显示面板各区域的亮度均匀，由此在OLED显示面板由于各驱动晶体管的迁移率不一致或阈值电压漂移，又或者是有机发光二极管OLED老化而出现显示不均匀或残影等现象，需要对显示面板进行光学补偿时，减少了光学补偿***中感测单元的数量，从而简化显示面板的制造工艺，降低成本。
 附图说明
图1为现有技术的显示面板的结构示意图；
图2为本发明实施例提供的显示面板的结构示意图；
图3为本发明实施例提供的显示面板的子像素单元和感测单元的结构示意图；
图4为本发明实施例提供的感测单元的具体结构示意图；
图5为本发明实施例提供的显示面板的剖面示意图；
图6为本发明实施例提供的显示面板的像素单元和感测单元的结构示意图；
图7为本发明实施例提供的显示面板的亮度补偿方法的总体流程图。
 本发明的实施方式
为使本申请的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本申请进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
目前的AMOLED面板通常采用电压式驱动方法进行驱动显示，由驱动IC提供一个表示灰阶的电压信号，该电压信号会在像素电路内部被转化为驱动晶体管的电流信号，从而驱动有机发光二极管OLED实现亮度灰阶，这种方法具有驱动速度快、实现过程简单的优点，适合驱动大尺寸显示面板，被业界广泛采用，只是需要采用额外的薄膜晶体管和电容器件来补偿各晶体管的非均匀性、电阻电容负载引起的IR drop和有机发光二极管OLED的非均匀性等问题。
图1为现有技术的显示面板的结构示意图，如图1所示，目前的AMOLED显示面板一般集成了光学补偿***，显示面板包括多个阵列排布的像素单元10，每个像素单元10包括多个子像素单元101（每个像素单元10包括的子像素单元101可以为红色子像素R、绿色子像素G和蓝色子像素B），每个子像素单元101中均设置有发光器件如有机发光二极管OLED。具体地，显示面板将各个子像素单元101的显示数据发给时序控制器，时序控制器将显示数据转换为电压信号，并输出给源极驱动器，源极驱动器通过数据线Data提供数据电压Vdata，使各个子像素单元101进行显示。在各个子像素单元101完成显示之后，光学补偿***利用光学镜头以及亮度测量仪器获取各个子像素单元101的有机发光二极管OLED的实际亮度，并将实际亮度与目标亮度进行数据运算后获取补偿数据，将补偿数据存储入源极驱动芯片，以使得源极驱动器通过调整数据线Data提供的数据电压Vdata，从而调整各个子像素单元101的亮度，使各个子像素单元101的亮度达到目标亮度。目前的光学补偿***中，每个光学传感器1仅对应一个子像素单元101，随着显示面板尺寸的增大，像素数量急剧增加，会导致所需的光学传感器1急剧增加，使得显示面板的制造工艺复杂、成本增加。
有鉴于此，图2为本发明实施例提供的显示面板的结构示意图，如图2所示，本发明实施例提供的显示面板还包括感测单元102，每个像素单元10中的多个子像素单元101分别连接同一个感测单元102；每个感测单元102用于测量对应的像素单元10中的各个子像素单元101的实际亮度，并根据实际亮度对各个子像素单元101进行亮度补偿，以使得各个子像素单元101达到目标亮度。其中，目标亮度是指各个子像素单元101根据数据线Data提供的数据信号分别需要达到的亮度。
可以理解的是，感测单元102可以为光学传感器，用于测量每个子像素单元101的亮度。
本实施例提供的显示面板，每个像素单元10中的多个子像素单元101共用同一个感测单元102，将每个像素单元10的正常显示过程和光学检测过程分开进行，在各个像素单元10进行正常显示之后，使每个像素单10中的多个子像素单元101依次发光，同时通过该像素单元对应的感测单元102分别测量该像素单元中的各个子像素单元101的实际亮度，并根据所实际亮度对各个子像素单元101进行亮度补偿，以使得各个子像素单元101达到目标亮度，从而使各个子像素单元101的亮度均达到目标亮度，即显示面板各区域的亮度均匀，由此在OLED显示面板由于各驱动晶体管的迁移率不一致或阈值电压漂移，又或者是有机发光二极管OLED老化而出现显示不均匀或残影等现象，需要对显示面板进行光学补偿时，减少了光学补偿***中感测单元102的数量，从而简化显示面板的制造工艺，降低成本。
基于上述实施例，图3为本发明实施例提供的显示面板的子像素单元101和感测单元102的结构示意图，图3给出了一种示例性的子像素单元101和感测单元102的结构，每个子像素单元101包括第一薄膜晶体管T1、第二薄膜晶体管T2、第三薄膜晶体管T3、第一存储电容C1和有机发光二极管OLED，其中，第一薄膜晶体管T1的栅极分别连接第二薄膜晶体管T2的漏极和第一存储电容C1的第一端，第一薄膜晶体管T1的源极连接电源正极VDD，第一薄膜晶体管T1的漏极连接第一存储电容C1的第二端、有机发光二极管OLED的阳极以及第三薄膜晶体管T3的源极，有机发光二极管OLED的阴极连接电源负极VSS，第二薄膜晶体管T2的栅极和第三薄膜晶体管T3的栅极连接第一扫描线Scan1，第二薄膜晶体管T2的源极连接数据线Data，第三薄膜晶体管T3的漏极连接感测线Sense。
请继续参阅图3，感测单元102包括第四薄膜晶体管T4、光敏二极管PIN和第二存储电容C2，第四薄膜晶体管T4的栅极连接第二扫描线Scan2，第四薄膜晶体管T4的漏极连接感测线Sense，第四薄膜晶体管T4的源极连接该感测单元102对应的各个子像素单元101的第三薄膜晶体管T3的漏极，第四薄膜晶体管T4的漏极连接光敏二极管PIN的第一端，光敏二极管PIN的第二端连接控制线V0（控制线V0使光敏二极管PIN处于反向偏置状态），第二存储电容C2的第一端连接感测线Sense。
需要说明的是，位于同一行的每相邻的两个子像素单元101中的像素驱动电路可以镜像设置，如图6所示，从而使同一行每相邻的两个子像素单元101可以共用同一条感测线Sense，以减少感测线Sense的数量。
进一步地，图4为本发明实施例提供的感测单元102的具体结构示意图，如图4所示，感测单元102还包括运算放大器103，运算放大器103和第二存储电容C2并联构成积分放大电路。光敏二极管PIN受到子像素单元101中的有机发光二极管OLED出射的光线照射一定时间后，积分放大电路将光敏二极管PIN产生的电荷形成的电流转换为电压信号，并将电压信号输入至时序控制器，时序控制器根据该电压信号控制源极驱动器调整数据线Data在子像素单元101进行显示时向子像素单元101提供的数据电压Vdata，从而补偿各个子像素单元101的亮度，使得各个子像素单元101的亮度达到目标亮度。
进一步地，请继续参阅图4，感测单元还包括补偿模块104，补偿模块104连接第二存储电容C2的第二端，补偿模块104用于根据子像素单元101的实际亮度，调整数据线Data向该子像素单元101提供的数据电压Vdata，以使得子像素单元101达到目标亮度。可以理解的是，补偿模块104与源极驱动器连接并将补偿数据传输给源极驱动器，由源极驱动器调整数据线Data提供的数据电压Vdata。
图5为本发明实施例提供的显示面板的剖面示意图，结合图3和图5所示，OLED显示面板由下至上依次包括基板、薄膜晶体管阵列、阳极、有机发光层、阴极和封装层，其中，阳极、有机发光层和阴极构成有机发光二极管OLED。本实施例中，将光敏二极管PIN设于有机发光层和薄膜晶体管阵列之间，并使有机发光二极管OLED采用底发射的方式，有机发光层向下出射光线至光敏二极管PIN。
本实施例提供的显示面板，将感测单元102的光敏二极管PIN设于有机发光二极管OLED的有机发光层和薄膜晶体管阵列之间，使有机发光二极管OLED采用底发射的方式，将有机发光层出射的部分光线设至光敏二极管PIN，从而使得光敏二极管PIN检测到有机发光二极管OLED的发光强度，即子像素单元101的实际亮度。相比于现有技术为了简化工艺和降低成本而将光敏二极管PIN和有机发光层设于同层印刷，本实施例将感测单元102的光敏二极管PIN设于有机发光二极管OLED的有机发光层和薄膜晶体管阵列之间，能够增加感光面积，大幅提高感光效果。
图7为本发明实施例提供的显示面板的亮度补偿方法的总体流程图，如图7所示，本发明实施例还提供一种显示面板的亮度补偿方法，包括：
S1、在显示面板进行预设帧图像的显示间隙，使每个像素单元中的多个子像素单元101依次发光，并通过感测单元102测量对应的像素单元中的各个子像素单元101的实际亮度。
S2、通过感测单元102根据各个子像素单元101的实际亮度，对各个子像素单元101进行亮度补偿，以使得各个子像素单元101达到目标亮度。
需要说明的是，显示面板进行每帧图像的显示时，包括正常显示时段（Vactive）和场消隐时段（Vblank），场消隐时段是指显示面板扫描完一帧后，要从图像的右下角返回到图像的左上角，开始新一帧的扫描，这一时间间隔。本实施例将每个像素单元的正常显示过程和光学检测过程分开进行，将光学检测过程在场消隐时段进行。
还需要说明的是，本实施例的每个像素单元中的多个子像素单元101共用同一个感测单元102，即每个感测单元102用于测量对应的一个像素单元中的所有子像素单元101的实际亮度，可以理解的是，在感测单元102测量一个子像素单元101的实际亮度时，该子像素单元101所在的像素单元中只有该子像素单元101发光，而该子像素单元101所在的像素单元中的其他子像素单元101均不发光，以使得感测单元102能准确感应该子像素单元101的实际亮度。由于每个场消隐时段较短，因此一般仅能完成一个子像素单元101的感测，因此若每个像素单元包括N个子像素单元101（N为正整数），则需要在至少N帧图像的显示间隙即N个场消隐时段，使每个像素单元中的N个子像素单元101依次发光，并通过感测单元102测量对应的像素单元中的N个子像素单元101的实际亮度，从而测量出所有子像素单元101的实际亮度，然后将所有子像素的实际亮度与其目标亮度进行对比，最后将目标亮度与实际亮度的差值作为补偿数据加入接下来的正常显示时段的数据信号中，从而调整下一帧图像进行显示的数据信号，即，每帧图像的正常显示阶段的数据信号是根据实际亮度以及目标亮度与实际亮度之间的差值叠加得到的。
本实施例提供的显示面板的亮度补偿方法，将每个像素单元的正常显示过程和光学检测过程分开进行，在各个像素单元进行正常显示之后，使每个像素单元中的多个子像素单元101依次发光，同时通过该像素单元对应的感测单元102分别测量该像素单元中的多个子像素单元101的实际亮度，并根据所实际亮度对各个子像素单元101进行亮度补偿，以使得各个子像素单元101达到目标亮度，从而使各个子像素单元101的亮度均达到目标亮度，即显示面板各区域的亮度均匀，由此减少了OLED显示面板由于各驱动晶体管的迁移率不一致或阈值电压漂移，又或者是有机发光二极管OLED老化而导致的显示不均匀或残影等现象的产生。
需要说明的是，步骤S1中，使每个像素单元中的多个子像素单元101依次发光，并通过感测单元102测量对应的像素单元中的各个子像素单元101的实际亮度，具体包括：依次使每个像素单元的其中一个子像素单元101发光，并通过该像素单元对应的感测单元102测量其中一个子像素单元101的实际亮度。
需要说明的是，步骤S2中，通过感测单元102根据各个子像素单元101的实际亮度，对各个子像素单元101进行亮度补偿，以使得各个子像素单元101达到目标亮度，具体包括：通过补偿模块104计算各个子像素单元101的实际亮度与目标亮度的差值，并调整数据线Data向各个子像素单元101提供的数据电压Vdata，使各个子像素单元101的实际亮度达到目标亮度。
基于上述实施例，步骤S1中，显示面板进行每帧图像的显示，具体包括：
在复位阶段，第一扫描线Scan1打开，使第二薄膜晶体管T2和第三薄膜晶体管T3打开，以复位第一存储电容C1的第一端和第二端的电位；
在写入阶段，通过数据线Data写入数据信号，使第一薄膜晶体管T1打开，并向第一存储电容C1充电；
在发光阶段，利用第一存储电容C1的耦合效应，使第一薄膜晶体管T1保持打开，并通过电源正极VDD使有机发光二极管OLED发光。
具体地，每帧图像的正常显示时段包括复位阶段、写入阶段和发光阶段，首先在复位阶段，将第一扫描线Scan1打开，使第二薄膜晶体管T2和第三薄膜晶体管T3打开，并通过数据线Data和感测线Sense分别将第一存储电容C1的第一端和第二端的电位复位为0；然后在写入阶段，由数据线Data通过第二薄膜晶体管T2写入数据信号，以使得第一薄膜晶体管T1打开，并向第一存储电容C1充电；在发光阶段，电源正极VDD通过第一薄膜晶体管T1使有机发光二极管OLED发光，此时，由于第一存储电容C1的耦合效应，使第一薄膜晶体管T1的栅源极电压差Vgs能保持不变，从而使第一薄膜晶体管T1保持打开。
基于上述实施例，步骤S1中，通过感测单元102测量对应的像素单元10中的各个子像素单元101的实际亮度，还包括：在发光阶段之后进行感测阶段，第一扫描线Scan1关闭，使第二薄膜晶体管T2和第三薄膜晶体管T3关闭；第二扫描线Scan2打开，使第四薄膜晶体管T4打开，以利用感测单元102测量对应的像素单元中的各个子像素单元101的实际亮度。
具体地，在连续两帧图像的正常显示时段之间的间隙，即场消隐时段，进行感测阶段，第一扫描线Scan1关闭，使第二薄膜晶体管T2和第三薄膜晶体管T3关闭，第二扫描线Scan2打开，使第四薄膜晶体管T4打开，以利用感测单元102测量对应的像素单元中的各个子像素单元101的实际亮度，若每个场消隐时段仅能测量每个像素单元中的一个子像素单元101的实际亮度，则每个像素单元包括N个子像素单元101（N为正整数）时，需要在至少N帧图像的显示间隙即N个场消隐时段，使每个单元中的N个子像素单元101依次发光，并通过感测单元102测量对应的像素单元中的N个子像素单元101的实际亮度，从而测量所有子像素单元101的实际亮度。
图6为本发明实施例提供的显示面板的像素单元和感测单元102的结构示意图，如图6所示，下面以每个像素单元包括形成田字形结构的红色子像素、绿色子像素、蓝色子像素和白色子像素为例，详细说明该亮度补偿方法的工作过程，其中，红色子像素和绿色子像素处于同一行，蓝色子像素和白色子像素处于同一行，红色子像素和蓝色子像素处于同一列，绿色子像素和白色子像素处于同一列。
具体地，位于同一行的子像素单元101共用同一条扫描线，位于同一列的子像素单元101共用同一列数据线Data，在显示面板进行预设帧图像的显示之后，在任意四帧图像（可以为连续的4帧图像，也可以为间断的4帧图像）的正常显示时段之后的场消隐时段，通过感测单元102分别测量其对应的像素单元中的红色子像素、绿色子像素、蓝色子像素和白色子像素的实际亮度，并根据实际亮度对各个子像素单元101进行亮度补偿，以使得各个子像素单元101达到目标亮度。
例如，在任意一帧图像的场消隐时段，让各个像素单元中的红色子像素发光，而绿色子像素、蓝色子像素和白色子像素不发光，通过感测单元102测量红色子像素的实际亮度，并将该实际亮度与当前帧图像在正常显示时段，数据线Data向红色子像素提供的数据电压Vdata需要使红色子像素达到的目标亮度进行比较，计算出实际亮度与目标亮度之间的差值，从而根据该差值调整下一帧图像数据线Data需要向红色子像素提供的数据信号，以使得红色子像素的实际亮度达到目标亮度。
需要说明的是，在每个场消隐时段，通过感测单元102可以测量各个像素单元中的同种颜色的子像素单元101的实际亮度，也可以测量各个像素单元中的不同种颜色的子像素单元101的实际亮度，只要在多个场消隐时段，测量到各个子像素单元101的实际亮度即可。
可以理解的是，对本领域普通技术人员来说，可以根据本申请的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本申请所附的权利要求的保护范围。

Claims (20)

  1. 一种显示面板，包括多个阵列排布的像素单元，每个所述像素单元包括多个子像素单元，其中，所述显示面板还包括感测单元，每个所述像素单元中的多个所述子像素单元分别连接同一个所述感测单元；
    每个所述感测单元用于测量对应的所述像素单元中的各个所述子像素单元的实际亮度，并根据所述实际亮度对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度。
  2. 如权利要求1所述的显示面板，其中，每个所述子像素单元包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第一存储电容和有机发光二极管；
    所述第一薄膜晶体管的栅极分别连接所述第二薄膜晶体管的漏极和所述第一存储电容的第一端，所述第一薄膜晶体管的源极连接电源正极，所述第一薄膜晶体管的漏极连接所述第一存储电容的第二端、所述有机发光二极管的阳极以及所述第三薄膜晶体管的源极，所述有机发光二极管的阴极连接电源负极，所述第二薄膜晶体管的栅极和第三薄膜晶体管的栅极连接第一扫描线，所述第二薄膜晶体管的源极连接数据线，所述第三薄膜晶体管的漏极连接感测线。
  3. 如权利要求2所述的显示面板，其中，所述感测单元包括第四薄膜晶体管、光敏二极管和第二存储电容，所述第四薄膜晶体管的栅极连接第二扫描线，所述第四薄膜晶体管的漏极连接所述感测线，所述第四薄膜晶体管的源极连接所述光敏二极管的第一端，所述光敏二极管的第二端连接控制线，所述第二存储电容的第一端连接所述感测线。
  4. 如权利要求3所述的显示面板，其中，所述感测单元还包括补偿模块，所述补偿模块连接所述第二存储电容的第二端，所述补偿模块用于根据所述子像素单元的实际亮度，调整所述数据线向该所述子像素单元提供的数据电压，以使得所述子像素单元达到所述目标亮度。
  5. 如权利要求3所述的显示面板，其中，所述有机发光二极管包括有机发光层，所述光敏二极管设于所述有机发光层和薄膜晶体管阵列之间，所述有机发光层出射光线至所述光敏二极管。
  6. 如权利要求1所述的显示面板，其中，所述显示面板为OLED显示面板。
  7. 一种显示面板的亮度补偿方法，用于权利要求1所述的显示面板，其中，所述亮度补偿方法包括：
    在所述显示面板进行预设帧图像的显示间隙，使每个像素单元中的多个子像素单元依次发光，并通过感测单元测量对应的所述像素单元中的各个所述子像素单元的实际亮度；
    通过所述感测单元根据各个所述子像素单元的实际亮度，对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度。
  8. 如权利要求7所述的显示面板的亮度补偿方法，其中，所述使每个像素单元中的多个子像素单元依次发光，并通过感测单元测量对应的像素单元中的各个所述子像素单元的实际亮度，具体包括：
    依次使每个所述像素单元的其中一个所述子像素发光，并通过该所述像素单元对应的所述感测单元测量其中一个所述子像素的实际亮度。
  9. 如权利要求7所述的显示面板的亮度补偿方法，其中，所述通过感测单元根据各个所述子像素单元的实际亮度，对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度，具体包括：
    通过补偿模块计算各个所述子像素单元的实际亮度与目标亮度的差值，并调整数据线向各个所述子像素单元提供的数据电压，使各个所述子像素单元的实际亮度达到所述目标亮度。
  10. 如权利要求7所述的显示面板的亮度补偿方法，其中，所述显示面板进行每帧图像的显示，具体包括：
    在复位阶段，第一扫描线打开，使第二薄膜晶体管和第三薄膜晶体管打开，以复位第一存储电容的第一端和第二端的电位；
    在写入阶段，通过数据线写入数据信号，使第一薄膜晶体管打开，并向所述第一存储电容充电；
    在发光阶段，利用所述第一存储电容的耦合效应，使所述第一薄膜晶体管保持打开，并通过电源正极使有机发光二极管发光。
  11. 如权利要求10所述的显示面板的亮度补偿方法，其中，所述通过感测单元测量对应的像素单元中的各个所述子像素单元的实际亮度，还包括：
    在所述发光阶段之后进行感测阶段，所述第一扫描线关闭，使所述第二薄膜晶体管和所述第三薄膜晶体管关闭；所述第二扫描线打开，使第四薄膜晶体管打开，以利用感测单元测量对应的所述像素单元中的各个所述子像素单元的实际亮度。
  12. 一种显示面板，其包括多个阵列排布的像素单元，每个所述像素单元包括多个子像素单元，其中，所述显示面板还包括感测单元，每个所述像素单元中的多个所述子像素单元分别连接同一个所述感测单元；
    每个所述感测单元用于测量对应的所述像素单元中的各个所述子像素单元的实际亮度，并根据所述实际亮度对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度；
    所述感测单元包括光敏二极管，每个子像素单元包括有机发光二极管和多个薄膜晶体管，所述有机发光二极管包括有机发光层，多个所述薄膜晶体管形成薄膜晶体管阵列，其中，所述光敏二极管设于所述有机发光层和所述薄膜晶体管阵列之间，且所述有机发光层出射光线至所述光敏二极管。
  13. 如权利要求12所述的显示面板，其中，每个所述子像素单元包括第一薄膜晶体管、第二薄膜晶体管、第三薄膜晶体管、第一存储电容和有机发光二极管；
    所述第一薄膜晶体管的栅极分别连接所述第二薄膜晶体管的漏极和所述第一存储电容的第一端，所述第一薄膜晶体管的源极连接电源正极，所述第一薄膜晶体管的漏极连接所述第一存储电容的第二端、所述有机发光二极管的阳极以及所述第三薄膜晶体管的源极，所述有机发光二极管的阴极连接电源负极，所述第二薄膜晶体管的栅极和第三薄膜晶体管的栅极连接第一扫描线，所述第二薄膜晶体管的源极连接数据线，所述第三薄膜晶体管的漏极连接感测线。
  14. 如权利要求13所述的显示面板，其中，所述感测单元包括第四薄膜晶体管、光敏二极管和第二存储电容，所述第四薄膜晶体管的栅极连接第二扫描线，所述第四薄膜晶体管的漏极连接所述感测线，所述第四薄膜晶体管的源极连接所述光敏二极管的第一端，所述光敏二极管的第二端连接控制线，所述第二存储电容的第一端连接所述感测线。
  15. 如权利要求14所述的显示面板，其中，所述感测单元还包括补偿模块，所述补偿模块连接所述第二存储电容的第二端，所述补偿模块用于根据所述子像素单元的实际亮度，调整所述数据线向该所述子像素单元提供的数据电压，以使得所述子像素单元达到所述目标亮度。
  16. 如权利要求12所述的显示面板，其中，所述显示面板的亮度补偿过程包括：
    在所述显示面板进行预设帧图像的显示间隙，使每个像素单元中的多个子像素单元依次发光，并通过感测单元测量对应的所述像素单元中的各个所述子像素单元的实际亮度；
    通过所述感测单元根据各个所述子像素单元的实际亮度，对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度。
  17. 如权利要求16所述的显示面板，其中，所述使每个像素单元中的多个子像素单元依次发光，并通过感测单元测量对应的像素单元中的各个所述子像素单元的实际亮度，具体包括：
    依次使每个所述像素单元的其中一个所述子像素发光，并通过该所述像素单元对应的所述感测单元测量其中一个所述子像素的实际亮度。
  18. 如权利要求16所述的显示面板，其中，所述通过感测单元根据各个所述子像素单元的实际亮度，对各个所述子像素单元进行亮度补偿，以使得各个所述子像素单元达到目标亮度，具体包括：
    通过补偿模块计算各个所述子像素单元的实际亮度与目标亮度的差值，并调整数据线向各个所述子像素单元提供的数据电压，使各个所述子像素单元的实际亮度达到所述目标亮度。
  19. 如权利要求16所述的显示面板，其中，所述显示面板进行每帧图像的显示，具体包括：
    在复位阶段，第一扫描线打开，使第二薄膜晶体管和第三薄膜晶体管打开，以复位第一存储电容的第一端和第二端的电位；
    在写入阶段，通过数据线写入数据信号，使第一薄膜晶体管打开，并向所述第一存储电容充电；
    在发光阶段，利用所述第一存储电容的耦合效应，使所述第一薄膜晶体管保持打开，并通过电源正极使有机发光二极管发光。
  20. 如权利要求19所述的显示面板，其中，所述通过感测单元测量对应的像素单元中的各个所述子像素单元的实际亮度，还包括：
    在所述发光阶段之后进行感测阶段，所述第一扫描线关闭，使所述第二薄膜晶体管和所述第三薄膜晶体管关闭；所述第二扫描线打开，使第四薄膜晶体管打开，以利用感测单元测量对应的所述像素单元中的各个所述子像素单元的实际亮度。
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