WO2018214432A1 - 显示面板及其驱动方法 - Google Patents

显示面板及其驱动方法 Download PDF

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Publication number
WO2018214432A1
WO2018214432A1 PCT/CN2017/112540 CN2017112540W WO2018214432A1 WO 2018214432 A1 WO2018214432 A1 WO 2018214432A1 CN 2017112540 W CN2017112540 W CN 2017112540W WO 2018214432 A1 WO2018214432 A1 WO 2018214432A1
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Prior art keywords
power line
pixel
current value
data voltage
power
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Ceased
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PCT/CN2017/112540
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English (en)
French (fr)
Inventor
申丽霞
张志广
张昌
喻勇
金兑炫
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Application filed by BOE Technology Group Co Ltd, Chengdu BOE Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US15/781,663 priority Critical patent/US10553160B2/en
Publication of WO2018214432A1 publication Critical patent/WO2018214432A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G09G2320/0295—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel by monitoring each display pixel

Definitions

  • the present disclosure belongs to the field of display technologies, and in particular, to a display panel and a driving method thereof.
  • An organic light emitting diode for light emitting display is disposed in each pixel of the organic light emitting diode (OLED) display panel.
  • the anode of the OLED is connected to the supply voltage and the cathode is grounded to provide the necessary voltage difference for illumination.
  • Each power line is connected to a plurality of pixels, and one end is connected to a power source, and a power supply voltage is supplied to the pixels via the power line.
  • the luminance of the organic light emitting diode is controlled by the current of the driving transistor in the pixel, and the current is controlled by the data voltage of the gate of the driving transistor, so that the brightness of the pixel can be controlled by adjusting the data voltage.
  • Embodiments of the present disclosure provide a display panel and a method of driving the same.
  • a driving method of a display panel includes a plurality of power lines, each of which is connected to a plurality of pixels, and one end of each of the power lines is connected to a power source.
  • the driving method of the display panel includes: obtaining a current value in a power line, wherein the current value is a current value in a portion of the power line between the power source and the first pixel, and the first pixel is a distance among all pixels connected to the power line The nearest pixel of the power supply.
  • the acquired current value is compared to a preset threshold. When the current value in the power line is less than or equal to the threshold, the original data voltage is supplied to the pixel connected to the power line.
  • the compensation data voltage is supplied to the pixel connected to the power line, and the compensation data voltage is equal to the difference between the original data voltage and the compensation voltage.
  • the equivalent distance is the distance of the pixel along the power line connected thereto to the power source distance.
  • the current value is an average value of currents in a portion of the power supply line between the power source and the first pixel in one frame of picture.
  • Providing the original data voltage to the pixel connected to the power line includes providing the original data voltage to all pixels connected to the power line in the next frame picture.
  • Providing the compensated data voltage to the pixels connected to the power line includes providing a compensated data voltage to all of the pixels connected to the power line in the next frame of the picture.
  • the current value is a real-time current value in the power line, and each pixel connected to the power line is connected to a different gate line.
  • Providing the original data voltage to the pixel connected to the power line includes providing the original data voltage to the next pixel connected to the power line.
  • Providing the compensated data voltage to the pixel connected to the power line includes providing a compensated data voltage to the next pixel connected to the power line.
  • the current value is calculated based on the grayscale value of the pixel connected to the power line; or, the current value is obtained by detection.
  • I is the current value in the power line connected to the pixel i
  • di is the equivalent distance corresponding to the pixel i
  • ⁇ is the resistivity of the material of the power line
  • A is the cross-sectional area of the power line.
  • the power lines are arranged in the column direction, and the pixels connected thereto are located in a plurality of different rows.
  • a display panel includes: a plurality of power lines, each of which is connected to a plurality of pixels, and one end of each of the power lines is connected to a power source.
  • the current acquisition unit is configured to acquire a current value in the power line, the current value is a current value of the power line in a portion between the power source and the first pixel, and the first pixel is the closest to the power source among all the pixels connected to the power line Pixel.
  • the comparison unit is configured to compare the current value to a preset threshold.
  • the data voltage supply unit is configured to communicate with the power source when the current value in the power line is less than or equal to the threshold
  • the pixels connected to the line provide the original data voltage; and when the current value in the power line is greater than the threshold, the compensation data voltage is supplied to the pixel connected to the power line, and the compensation data voltage is equal to the difference between the original data voltage and the compensation voltage, at the current value.
  • the larger the equivalent voltage, the larger the compensation voltage corresponding to the pixel, and the equivalent distance is the distance from the trajectory of the pixel along the power line connected to the power source.
  • the current value is an average value of currents in a portion of the power supply line between the power source and the first pixel in one frame of the picture.
  • the data voltage supply unit is configured to provide the original data voltage to all pixels connected to the power line in the next frame picture.
  • the data voltage supply unit is configured to provide a compensation data voltage to all pixels connected to the power line in the next frame picture.
  • the current value is a real-time current value in the power line, and each pixel connected to the power line is connected to a different gate line.
  • the data voltage supply unit When the current value in the power line is less than or equal to the threshold, the data voltage supply unit is configured to provide the original data voltage to the next pixel connected to the power line.
  • the data voltage supply unit When the current value in the power line is greater than the threshold, the data voltage supply unit is configured to provide a compensation data voltage to the next pixel connected to the power line.
  • the current acquisition unit includes: a current calculation module configured to calculate a current value according to a grayscale value of a pixel connected to the power line; or a current detection module configured to detect The current value in the power line.
  • FIG. 1 is a schematic structural view of a display panel according to an embodiment of the present disclosure
  • FIG. 2 is a circuit diagram of a pixel circuit of a display panel according to an embodiment of the present disclosure
  • FIG. 3 is a flowchart of a driving method of a display panel according to an embodiment of the present disclosure.
  • element A is connected to element B
  • element A is “directly” or “indirectly” connected to element B by one or more other elements, unless otherwise stated.
  • "an," and "said&quot are intended to include the plural.
  • FIG. 1 shows a schematic structural diagram of a display panel according to an embodiment of the present disclosure.
  • the display panel may include any type of display panel.
  • the present disclosure will be described below by taking an organic light emitting diode display panel as an example, but this does not constitute a limitation of the present disclosure.
  • the display panel is provided with a plurality of power lines 1 , each of which is connected to a plurality of pixels 2 , and one end of each of the power lines 1 is connected to the power source 3 .
  • the display panel is provided with a plurality of power lines 1 , each of which is connected to a plurality of pixels 2 , and one end of each of the power lines 1 is connected to the power source 3 .
  • Those skilled in the art will appreciate that other functional modules may also be included on the display panel of FIG.
  • An organic light emitting diode is disposed in each of the pixels 2, and display can be realized by controlling the light emission of the organic light emitting diode.
  • the power source 3 may be, for example, a drive chip, a power interface, or the like, configured to provide power to the organic light emitting diodes of the pixels 2 via the respective power lines 1 .
  • FIG. 2 shows an exemplary circuit diagram of a pixel circuit.
  • the pixel circuit may include a driving transistor T1, a switching transistor T2, and a storage capacitor C.
  • the turn-on and turn-off of the switching transistor T2 is controlled by the gate line 4.
  • the switching transistor T2 When the switching transistor T2 is turned on, the data voltage of the data line 5 is applied to the gate of the driving transistor T1 via the switching transistor T2.
  • the gate-to-source voltage difference of the driving transistor T1 controls the current of the driving transistor T1 (ie, the current between the source and the drain of the driving transistor T1), Further, the current and the luminance of the organic light emitting diode connected in series with the driving transistor T1 are controlled.
  • the switching transistor T2 When the switching transistor T2 is turned off, it can be kept driven by the storage capacitor C.
  • the voltage at the gate of transistor T1 maintains illumination.
  • the pixel circuit can also be implemented by other circuit structures such that a data voltage is applied to the gate of the driving transistor T1 to control the current of the organic light emitting diode, and thus will not be described in detail herein.
  • each organic light emitting diode has to flow into the power line, and the power line has a certain resistance. Therefore, there is an IR drop on the power line, and the voltage at each location of the power line is actually different. Specifically, the lower the voltage at the power line from the power source, the lower the actual power supply voltage that is correspondingly supplied to the pixel.
  • the current of the driving transistor is determined by its gate-source voltage. Since the source voltage is connected to the power supply voltage, when the power supply voltage is changed (eg, lowered), the current of the driving transistor will change accordingly, resulting in a change in pixel brightness.
  • the variations of the power supply voltages in different pixels are also different, and the brightness variations caused by them are also different. Therefore, the brightness of the OLED display panel at different positions is not uniform (not the brightness that is desired to be displayed), which affects the display effect.
  • FIG. 3 illustrates a flow chart of a method of driving an organic light emitting diode display panel according to an embodiment of the present disclosure, including the following steps.
  • step S310 the current value in the power line 1 is acquired.
  • the current value is the current value of the power line 1 in the portion between the power source 3 and the first pixel 2, and the first pixel 2 is the pixel 2 closest to the power source 3 among all the pixels 2 connected to the power line 1.
  • step S320 the acquired current value is compared with a preset threshold.
  • step S330 based on the above comparison result, the data voltage is supplied to the pixel 2 connected to the power supply line 1.
  • the original data voltage is supplied to the pixel 2 connected to the power source line 1.
  • the compensation data voltage is supplied to the pixel 2 connected to the power line 1, and the compensation data voltage is equal to the difference between the original data voltage and the compensation voltage.
  • the equivalent distance is the distance of the pixel 2 along the trajectory of the power supply line 1 connected thereto to the power source 3.
  • the current value for comparison is the current in the portion of the power line 1 between the power source 3 and the first row of pixels 2, that is, the maximum current in the power line 1, or all of it.
  • the brightness of the pixel 2 is controlled by the data voltage supplied to it by the data line 5.
  • the original data voltage refers to a voltage that is supplied to the pixel 2 directly corresponding to the brightness that should theoretically be displayed, without considering the voltage drop.
  • the equivalent distance refers to the actual length of the power supply line 1 from the junction of the pixel 2 and the power supply line 1 to the power source 3, that is, the distance through which the current flows in the power supply line 1 when the pixel 2 is reached. Specifically, the distance is proportional to the voltage drop of the power line 1. Therefore, the change in the luminance of the pixel 2 and its corresponding equivalent distance are related to the current value in the power supply line 1.
  • a threshold can be set in advance.
  • the current value in the power line 1 ie, the maximum current above
  • the brightness of the pixel 2 connected to the power line 1 is relatively uniform, and no compensation is needed.
  • the current value in the power line 1 exceeds the threshold, it indicates that the brightness unevenness of the pixel 2 connected to the power line 1 is relatively serious and should be compensated.
  • the compensation value corresponding to the pixel 2 corresponding to the larger equivalent distance should be larger.
  • the data voltage of the pixel 2 is compensated. Since the voltage drop of the power supply voltage of the pixel 2 farther from the power source 3 is larger, the compensation voltage corresponding thereto is made larger by adjusting the actual data voltage. In this way, the actual brightness of the pixel 2 can be guaranteed to be substantially unchanged, and the phenomenon of uneven brightness can be eliminated.
  • the current value is the average of the currents of the power line 1 in the portion between the power source 3 and the first pixel 2 in a frame of picture.
  • Supplying the original data voltage to the pixel 2 connected to the power line 1 includes providing the original pixel 2 connected to the power line 1 in the next frame picture.
  • the data voltage; providing the compensated data voltage to the pixel 2 connected to the power line 1 includes providing a compensation data voltage to all of the pixels 2 connected to the power line 1 in the next frame picture.
  • the picture of adjacent frames usually has a certain continuity, that is, the brightness of a certain part of a frame (ie, the current value in the corresponding power line 1) is generally not different from the brightness of the same part of the previous frame. too much. Therefore, the average current value of the power supply line 1 in the frame picture can be used as a basis for judging whether or not compensation is to be performed in the next frame picture. If the average current value of a power supply line 1 in the frame picture exceeds the threshold value, the data voltage supplied to all the pixels 2 connected to the power supply line 1 should be compensated in the next frame picture. This is beneficial to reduce the number of comparisons of currents.
  • the current value is a real-time current value (ie, the above maximum current) in the power line 1, and each pixel 2 connected to the same power line 1 is connected to a different gate line 4, respectively.
  • Supplying the original data voltage to the pixel 2 connected to the power line 1 includes supplying the original data voltage to the next pixel 2 connected to the power line 1.
  • Supplying the compensation data voltage to the pixel 2 connected to the power line 1 includes providing a compensation data voltage to the next pixel 2 connected to the power line 1.
  • the organic light emitting diode display panel data voltages are sequentially supplied to different pixels 2 by scanning of the gate lines 4. If a plurality of pixels 2 connected to one power supply line 1 are connected to different gate lines 4, the data voltages of these pixels 2 are also separately supplied at different times. Therefore, the current value in the power line 1 can be detected in real time, and based on the current value, it is determined whether the compensation data voltage is supplied to the next pixel 2 (ie, the pixel 2 connected to the next scanned gate line 4). The way to more accurately reflect whether compensation is necessary.
  • the "acquisition of the current value in the power supply line 1" in the above description can be obtained by a certain means, or can also be obtained by direct detection.
  • the current value can be calculated from the grayscale value of the pixel 2 connected to the power line 1.
  • the driver chip first converts the original image (ie, the image to be displayed by the OLED display panel) into the grayscale value (or brightness value) of each pixel 2, and the grayscale value and the corresponding pixel 2 The current value corresponds. Therefore, at any time, the grayscale values currently displayed by each pixel 2 connected to a power supply line 1 are known, and the total current in these pixels 2 can be calculated by these grayscale values, that is, the power supply line The current value in 1 (ie the maximum current above). That is, the current value in the power line can be finally calculated from the original image information.
  • the current value can also be obtained by direct detection. That is to say, a detection module for detecting a current can be provided in each of the power source line 1 or the power source 3, thereby obtaining a current in the power source line 1 by means of detection.
  • the compensation voltage ⁇ Vi corresponding to the pixel i can be calculated according to the following formula:
  • I is the current value in the power supply line 1 connected to the pixel i
  • di is the equivalent distance corresponding to the pixel i
  • ⁇ is the resistivity of the material of the power supply line 1
  • A is the cross-sectional area of the power supply line 1.
  • the power line 1 is disposed in a column direction with the pixels 2 connected thereto located in a plurality of different rows.
  • the resistance of the power line 1 between the pixel 2 and the power source 3 ⁇ R the resistance of the power line 1 between two adjacent rows of pixels 2, and n is the number of lines in which the pixel i is located.
  • the distance between any two adjacent rows is equal, so if the power line 1 is arranged in the column direction as shown in Fig. 1, the resistance is increased by a certain amount ⁇ R for each additional line. Therefore, the total resistance of the power supply line 1 corresponding to the pixel 2 of the nth row should be equal to R1 + ⁇ R ⁇ (n-1), so the compensation voltage ⁇ Vi at this time can be calculated by the above formula.
  • a display panel is also provided.
  • the display panel includes a plurality of power lines 1, each of which is connected to a plurality of pixels 2, and one end is connected to the power source 3. Further, the display panel further includes a current acquisition unit, a comparison unit, and a data voltage supply unit.
  • the current acquisition unit is configured to acquire a current value in the power supply line 1.
  • the current value is the current value of the power line 1 in the portion between the power source 3 and the first pixel 2, and the first pixel 2 is the pixel 2 closest to the power source 3 among all the pixels 2 connected to the power line 1.
  • the comparison unit is configured to compare the current value to a preset threshold.
  • the data voltage supply unit is configured to supply a data voltage to the pixel 2 connected to the power supply line 1 in accordance with the comparison result. Specifically, when the current value in the power supply line 1 is less than or equal to the threshold value, the original data voltage is supplied to the pixel 2 connected to the power supply line 1. When the current value in the power supply line 1 is greater than the threshold value, the compensation data voltage is supplied to the pixel 2 connected to the power supply line 1, and the compensation data voltage is equal to the difference between the original data voltage and the compensation voltage. In the case where the current values are the same, the larger the compensation voltage corresponding to the pixel 2 having the larger equivalent distance, the equivalent distance is the distance of the pixel 2 along the trajectory of the power supply line 1 connected thereto to the power source 3.
  • the current value is an average value of currents in a portion of the power supply line 1 between the power source 3 and the first pixel 2 in one frame of picture.
  • the data voltage supply unit is configured to supply the original data voltage to all the pixels 2 connected to the power supply line 1 in the next frame picture.
  • the data voltage supply unit is configured to supply a compensation data voltage to all of the pixels 2 connected to the power supply line 1 in the next frame picture.
  • the current value is a real-time current value in the power supply line 1, and each of the pixels 2 connected to one power supply line 1 is connected to a different gate line 4, respectively.
  • the data voltage supply unit is used to connect to the power line 1 One pixel 2 provides the original data voltage.
  • the data voltage supply unit is configured to supply a compensation data voltage to the next pixel 2 connected to the power supply line 1.
  • the current acquisition unit includes a current calculation module or a current detection module.
  • the current calculation module is configured to calculate a current value from the grayscale value of the pixel 2 connected to the power supply line 1.
  • the current detection module is configured to detect a current value in the power line 1.
  • the display panel of the present embodiment can perform the above driving method, so that the display unevenness can be reduced.
  • the display panel may be any product or component having a display function, such as an electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • a display function such as an electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the units or modules described herein may be implemented as a combination of a processor and a memory, where the processor executes a program stored in the memory to implement the functionality of the respective unit or module.
  • the units or modules described herein may also be implemented in a complete hardware implementation, including an application specific integrated circuit (ASIC), field programmable gate array (FPGA), and the like.
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array

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Abstract

一种有机发光二极管显示面板及其驱动方法。该有机发光二极管显示面板包括多条电源线（1），每条电源线（1）连接多个像素（2），且一端连接电源（3）；而相应的驱动方法包括：获取电源线（1）中的电流值，并将其与预设的阈值比较；当一电源线（1）中的电流值小于或等于阈值时，向与该电源线（1）相连的像素（2）提供原数据电压；当一电源线（1）中的电流值大于阈值时，向与该电源线（1）相连的像素（2）提供补偿数据电压，补偿数据电压等于原数据电压与补偿电压的差，在电流值相同的情况下，等效距离越大的像素（2）对应的补偿电压越大，等效距离为像素（2）沿与其相连的电源线（1）的轨迹到电源（3）距离。

Description

显示面板及其驱动方法
相关申请的交叉引用
本申请要求于2017年5月26日递交的中国专利申请第201710389106.9号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开属于显示技术领域，具体涉及一种显示面板及其驱动方法。
背景技术
有机发光二极管(OLED)显示面板的每个像素中设有一个用于发光显示的有机发光二极管。有机发光二极管的阳极连接电源电压，阴极接地，以为其提供发光必须的电压差。每条电源线与多个像素相连，且一端连接电源，经由电源线向像素提供电源电压。通常，通过像素中的驱动晶体管的电流控制有机发光二极管的发光亮度，该电流则由驱动晶体管栅极的数据电压控制，故可通过调整数据电压来控制像素亮度。
发明内容
本公开的实施例提供了一种显示面板及其驱动方法。
根据本公开的第一方面，提供了一种显示面板的驱动方法。该显示面板包括多条电源线，每条电源线连接多个像素，且每条电源线的一端连接电源。显示面板的驱动方法包括：获取电源线中的电流值，该电流值是电源线在电源与第一像素之间的部分中的电流值，第一像素是与该电源线相连的全部像素中距离电源最近的像素。将所获取的电流值与预设的阈值比较。当电源线中的电流值小于或等于阈值时，向与该电源线相连的像素提供原数据电压。当电源线中的电流值大于阈值时，向与该电源线相连的像素提供补偿数据电压，补偿数据电压等于原数据电压与补偿电压的差。在 电流值相同的情况下，等效距离越大的像素对应的补偿电压越大，等效距离是像素沿与其相连的电源线的轨迹到电源距离。
在本公开的实施例中，电流值是一帧画面中电源线在电源与第一像素之间的部分中的电流的平均值。向与该电源线相连的像素提供原数据电压包括：在下一帧画面中，向与该电源线相连的全部像素提供原数据电压。向与该电源线相连的像素提供补偿数据电压包括：在下一帧画面中，向与该电源线相连的全部像素提供补偿数据电压。
在本公开的实施例中，电流值是电源线中实时的电流值，且与该电源线相连的各像素分别与不同的栅极线相连。向与该电源线相连的像素提供原数据电压包括：向与该电源线相连的下一个像素提供原数据电压。向与该电源线相连的像素提供补偿数据电压包括：向与该电源线相连的下一个像素提供补偿数据电压。
在本公开的实施例中，电流值根据与电源线相连的像素的灰阶值计算得到；或者，电流值通过检测得到。
在本公开的实施例中，与像素i对应的补偿电压ΔVi根据以下公式计算：ΔVi＝I×di×ρ/A。I是与像素i相连的电源线中的电流值，di是像素i对应的等效距离，ρ是电源线的材料的电阻率，A是电源线的横截面积。
在本公开的实施例中，电源线沿列方向设置，与其相连的像素位于多个不同行中。与像素i对应的补偿电压ΔVi根据以下公式计算：ΔVi＝I×[R1+ΔR×(n-1)]。I是与像素i相连的电源线中的电流值，R1是第1行像素与电源间的电源线的电阻，ΔR是两相邻行像素间的电源线的电阻，n是像素i所在的行数。
根据本公开的第二方面，提供了一种显示面板。显示面板包括：多条电源线，每条电源线连接多个像素，且每条电源线的一端连接电源。电流获取单元被配置为获取电源线中的电流值，电流值是电源线在电源与第一像素间的部分中的电流值，第一像素是与该电源线相连的全部像素中距离电源最近的像素。比较单元被配置为将电流值与预设的阈值比较。数据电压提供单元被配置为在电源线中的电流值小于或等于阈值时，向与该电源 线相连的像素提供原数据电压；并在电源线中的电流值大于阈值时，向与该电源线相连的像素提供补偿数据电压，补偿数据电压等于原数据电压与补偿电压的差，在电流值相同的情况下，等效距离越大的像素对应的补偿电压越大，等效距离是像素沿与其相连的电源线的轨迹到电源的距离。
在本公开的实施例中，电流值是一帧画面中电源线在电源与第一像素间的部分中的电流的平均值。在电源线中的电流值小于或等于阈值时，数据电压提供单元被配置为在下一帧画面中向与该电源线相连的全部像素提供原数据电压。在电源线中的电流值大于阈值时，数据电压提供单元被配置为在下一帧画面中向与该电源线相连的全部像素提供补偿数据电压。
在本公开的实施例中，电流值是所述电源线中实时的电流值，且与电源线相连的各像素分别与不同的栅极线相连。在电源线中的电流值小于或等于所述阈值时，数据电压提供单元被配置为向与该电源线相连的下一个像素提供原数据电压。在电源线中的电流值大于阈值时，数据电压提供单元被配置为向与该电源线相连的下一个像素提供补偿数据电压。
在本公开的实施例中，所述电流获取单元包括：电流计算模块，其被配置为根据与电源线相连的像素的灰阶值计算得到电流值；或者，电流检测模块，其被配置为检测电源线中的电流值。
附图说明
为了更清楚地说明本公开的技术方案，下面将对实施例的附图进行简单说明。应当知道，以下描述的附图仅仅是本公开的一些实施例，而非对本公开的限制，在附图中：
图1为本公开的实施例的一种显示面板的结构示意图；
图2为本公开的实施例的一种显示面板的像素电路的电路图；以及
图3为本公开的实施例的一种显示面板的驱动方法的流程图。
具体实施方式
为了使本公开的实施例的目的、技术方案和优点更加清楚，下面将结 合附图，对本公开的实施例的技术方案进行清楚、完整的描述。显然，所描述的实施例仅仅是本公开的一部分实施例，而并非全部的实施例。基于所描述的实施例，本领域的普通技术人员在无需创造性劳动的前提下所获得的所有其它实施例，也都属于本公开的范围。
在本文中，除非特别说明，表述“元件A连接到元件B”意为元件A“直接”或通过一个或多个其它元件“间接”连接到元件B。
如本文中使用的，除非另外明确陈述，单数形式的“一个”、“该”和“所述”旨在同样包括复数形式。
如本文中使用的，术语“包括”、“包含”特指所述特征、整数、步骤、操作、元件和/或部分的存在，但不排除一个或多个其它特征、整数、步骤、操作、元件、部件和/或其组合的存在或附加。
图1示出了根据本公开的实施例的一种显示面板的示意性结构图。根据本公开的实施例，该显示面板可包括任何类型的显示面板。为便于描述，在下文中以有机发光二极管显示面板为例来描述本公开，然而这不构成对本公开的限制。如图1所示，显示面板上设置有多条电源线1，每条电源线1连接多个像素2，并且每条电源线1的一端连接电源3。本领域技术人员可以理解，在图1的显示面板上还可包括其它功能模块。
每个像素2中设置有一个有机发光二极管，可通过控制有机发光二极管发光来实现显示。电源3例如可以是驱动芯片、电源接口等，其被配置为经由各条电源线1为像素2的有机发光二极管提供电力。
像素2中还可包括像素电路，图2示出了一种像素电路的示例性电路图。如图2所示，像素电路可包括驱动晶体管T1、开关晶体管T2、存储电容C。通过栅极线4控制开关晶体管T2的导通和关断。当开关晶体管T2导通时，数据线5的数据电压经过开关晶体管T2施加到驱动晶体管T1的栅极上。驱动晶体管T1的栅源电压差(即，驱动晶体管T1的栅极和源极之间的电压差)控制驱动晶体管T1的电流(即，驱动晶体管T1的源极和漏极之间的电流)，进而控制与驱动晶体管T1串联的有机发光二极管的电流和发光亮度。在开关晶体管T2关断时，可通过存储电容C保持驱动 晶体管T1栅极的电压，维持发光。
此外，像素电路还可通过其它电路结构实现，以使得将数据电压加载到驱动晶体管T1的栅极以控制有机发光二极管的电流，故在此不再详细描述。
各有机发光二极管的电流都要流入电源线，而电源线上具有一定电阻。因此，电源线上存在压降(IR drop)，且电源线的各位置处的电压实际是不同。具体地，电源线上距电源越远处的电压越低，相应被提供到像素中的实际的电源电压也越低。虽然有机发光二极管的亮度不由其电源电压决定，但驱动晶体管的电流却由其栅源电压决定。由于源极电压连接电源电压，故当电源电压发生改变(例如，降低)时，驱动晶体管的电流将相应地变化，进而导致像素亮度变化。由于不同像素与电源的距离不同，所以不同像素中的电源电压的变化也不同，由其引起的亮度变化也不同。因此，有机发光二极管显示面板不同位置的亮度不均(不是指所希望显示的亮度不同)，影响显示效果。
图3示出根据本公开实施例的有机发光二极管显示面板的驱动方法的流程图，包括如下步骤。
在步骤S310中，获取电源线1中的电流值。该电流值是电源线1在电源3与第一个像素2间的部分中的电流值，第一个像素2是与该电源线1相连的全部像素2中距离电源3最近的像素2。
在步骤S320中，将所获取的电流值与预设的阈值进行比较。
在步骤S330中，根据上述比较结果，向与该电源线1相连的像素2提供数据电压。
具体地，当电源线1中的电流值小于或等于阈值时，向与该电源线1相连的像素2提供原数据电压。当电源线1中的电流值大于阈值时，向与该电源线1相连的像素2提供补偿数据电压，补偿数据电压等于原数据电压与补偿电压的差。在电流值相同的情况下，等效距离越大的像素2对应的补偿电压越大，等效距离为像素2沿与其相连的电源线1的轨迹到电源3的距离。
由于每个像素2中的电流均会从不同位置流入电源线1中，所以电源线1不同位置处的电流实际上是不同的，其越靠近电源3的部分电流越大。而本实施例中，用于进行比较的电流值是电源3与第一行像素2之间的电源线1部分中的电流，也就是该电源线1中最大的电流，或者说是全部与该电源线1相连的像素2的总电流。
在不考虑压降的情况下，像素2的亮度由数据线5向其提供的数据电压控制。原数据电压是指在不考虑压降的情况下，提供给像素2的与其理论上应显示的亮度直接对应的电压。
等效距离是指从像素2与电源线1的连接处到电源3之间的电源线1的实际长度，其也就是在达到该像素2时电流在电源线1中流过的距离。具体地，该距离与电源线1的压降成正比。因此，像素2的亮度的变化和与其对应的等效距离和电源线1中的电流值相关。
因此，可预先设置一个阈值，当电源线1中的电流值(即以上最大电流)不超出阈值时，则说明与该电源线1相连的像素2的亮度较为均匀，无需进行补偿。当电源线1中的电流值超出该阈值时，则说明与该电源线1相连的像素2的亮度不均匀比较严重，应进行补偿。此时，不再向与该电源线1相连的像素2提供原数据电压Vdata，而是向其提供减去补偿电压ΔV的补偿数据电压Vdata’＝Vdata-ΔV。
由于电源线1上的电压的压降与等效距离成正比，所以在对像素2进行补偿时，其中对应等效距离越大的像素2对应的补偿值也应越大。
在本实施例的显示面板的驱动方法中，当电源线1中的电流过大(即与电源线1相连的像素2亮度不均比较明显)时，对像素2的数据电压进行补偿。由于距离电源3越远的像素2的电源电压压降越大，因此通过调整实际的数据电压，使与其对应的补偿电压越大。这样，最终可保证像素2的实际亮度基本不变，消除亮度不均匀的现象。
在一个实施例中，电流值为一帧画面中电源线1在电源3与第一个像素2间的部分中的电流的平均值。向与该电源线1相连的像素2提供原数据电压包括：在下一帧画面中，向与该电源线1相连的全部像素2提供原 数据电压；向与该电源线1相连的像素2提供补偿数据电压包括：在下一帧画面中，向与该电源线1相连的全部像素2提供补偿数据电压。
在实际显示中，相邻帧的画面通常有一定连续性，即一帧画面中某部分的亮度(即相应电源线1中的电流值)通常与前一帧画面中相同部分的亮度不会相差太多。因此，可用本帧画面中电源线1的平均电流值作为判断下一帧画面中是否要进行补偿的依据。若本帧画面中一电源线1的平均电流值超过阈值，则在下一帧画面中对提供给与该电源线1相连的全部像素2的数据电压都应进行补偿。这样有利于减少对电流的比较次数。
在另一实施例中，电流值为电源线1中实时的电流值(即以上最大电流)，且与同一电源线1相连的各像素2分别与不同的栅极线4相连。向与该电源线1相连的像素2提供原数据电压包括：向与该电源线1相连的下一个像素2提供原数据电压。向与该电源线1相连的像素2提供补偿数据电压包括：向与该电源线1相连的下一个像素2提供补偿数据电压。
在有机发光二极管显示面板中，通过栅极线4的扫描依次向不同像素2提供数据电压。若连接在一条电源线1上的多个像素2与不同栅极线4相连，则这些像素2的数据电压也是在不同时刻分别提供。因此，可实时检测电源线1中的电流值，并根据该电流值确定是否向下一个像素2(即与下一条被扫描到的栅极线4相连的像素2)提供补偿数据电压，这样的方式能更准确的体现补偿是否必要。
以上描述中的“获取电源线1中的电流值”可通过一定的手段获取，或者也可通过直接检测来获取。
在实施例中，电流值可根据与电源线1相连的像素2的灰阶值计算得到。
在显示时，驱动芯片先要将原始图像(即有机发光二极管显示面板所要显示的图像)信息转换为每个像素2的灰阶值(或者说亮度值)，而灰阶值与相应像素2中的电流值对应。因此，在任意时刻，与一条电源线1相连的各像素2当前正在显示的灰阶值是可知的，而通过这些灰阶值即可计算出这些像素2中的总电流，也就是该电源线1中的电流值(即以上最大电流)。 也就是说，可根据原始图像信息最终计算的到电源线中的电流值。
另一方面，也可通过直接检测获得电流值。也就是说，可在各电源线1或电源3中设置检测电流的检测模块，从而通过检测的方式获得电源线1中的电流。
根据本公开的实施例，与像素i对应的补偿电压ΔVi可根据以下公式计算获得：
ΔVi＝I×di×ρ/A
I为与像素i相连的电源线1中的电流值，di为像素i对应的等效距离，ρ为电源线1材料的电阻率，A则为电源线1的横截面积。
流过驱动晶体管T1的电流公式为：I＝K×(VDD-Vdata)2，其中K为与驱动晶体管T1的材料结构相关的常数，VDD为电源电压，Vdata为数据电压。也就是说，在像素i中，流过第i个像素的驱动晶体管T1的电流与(VDDi-Vdatai)2成正比关系，其中VDDi为像素i实际的电源电压，Vdatai为其数据电压。
当发生压降时，实际的电源电压VDDi降低，故数据电压Vdatai也应有同等程度的降低，以保证(VDDi-Vdatai)2的值不变。而电源电压VDDi的降低量即为压降，等于I×Ri，Ri为像素i到电源3间的电源线1的电阻。根据电阻计算公式可知Ri＝di×ρ/A，故补偿电压ΔVi应按照以上公式计算。
在一个实施例中，电源线1沿列方向设置，与其相连的像素2位于多个不同行中。与像素i对应的补偿电压ΔVi根据以下公式计算：ΔVi＝I×[R1+ΔR×(n-1)]，其中I为与像素i相连的电源线1中的电流值，R1为第1行像素2与电源3间的电源线1的电阻，ΔR两相邻行像素2间的电源线1的电阻，n为像素i所在的行数。
通常而言，任意两相邻行间的距离都是相等的，故若电源线1是如图1所示沿列方向设置的，则每增加一行其电阻也就会增加一个确定的量ΔR。因此，第n行像素2对应的电源线1的总电阻则应等于R1+ΔR×(n-1)，故可通过以上公式计算此时的补偿电压ΔVi。
应当理解，电源线1中不同位置的电流实际是不同的，而以上计算均用其中的最大电流进行，这是为了简化计算过程而采用的近似方式，但并不影响本公开的实现。
当然，以上只是补偿电压计算方法的部分具体示例，而不是对本公开保护范围的限定。
根据本公开的实施例，还提供了一种显示面板。显示面板包括多条电源线1，每条电源线1连接多个像素2，且一端连接电源3。此外，显示面板还包括电流获取单元、比较单元和数据电压提供单元。
电流获取单元被配置为获取电源线1中的电流值。电流值为电源线1在电源3与第一个像素2间的部分中的电流值，第一个像素2为与该电源线1相连的全部像素2中距离电源3最近的像素2。
比较单元被配置为将电流值与预设的阈值比较。
数据电压提供单元被配置为根据比较结果，向与该电源线1相连的像素2提供数据电压。具体地，在电源线1中的电流值小于或等于阈值时，向与该电源线1相连的像素2提供原数据电压。在电源线1中的电流值大于阈值时，向与该电源线1相连的像素2提供补偿数据电压，补偿数据电压等于原数据电压与补偿电压的差。在电流值相同的情况下，等效距离越大的像素2对应的补偿电压越大，等效距离为像素2沿与其相连的电源线1的轨迹到电源3距离。
在本公开的实施例中，电流值为一帧画面中，电源线1在电源3与第一个像素2间的部分中的电流的平均值。在一电源线1中的电流值小于或等于阈值时，数据电压提供单元用于在下一帧画面中，向与该电源线1相连的全部像素2提供原数据电压。在一电源线1中的电流值大于阈值时，数据电压提供单元用于在下一帧画面中，向与该电源线1相连的全部像素2提供补偿数据电压。
在本公开的实施例中，电流值为电源线1中实时的电流值，且与一电源线1相连的各像素2分别与不同的栅极线4相连。在一电源线1中的电流值小于或等于阈值时，数据电压提供单元用于向与该电源线1相连的下 一个像素2提供原数据电压。在一电源线1中的电流值大于阈值时，数据电压提供单元用于向与该电源线1相连的下一个像素2提供补偿数据电压。
在本公开的实施例中，电流获取单元包括电流计算模块或者电流检测模块。电流计算模块被配置为根据与电源线1相连的像素2的灰阶值计算得到电流值。电流检测模块被配置为检测电源线1中的电流值。
本实施例的显示面板可执行以上的驱动方法，故其可降低显示的不均匀。
具体的，该显示面板可以是电子纸、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
本文中描述的单元或模块可以实现为处理器和存储器的组合，其中处理器执行存储器中存储的程序以实现相应单元或模块的功能。本文中描述的单元或模块也可以完全的硬件实施方式实现，包括专用集成电路(ASIC)、现场可编程门阵列(FPGA)等。
可以理解的是，以上实施方式仅仅是为了说明本公开的原理而采用的示例性实施方式，然而本公开并不局限于此。对于本领域内的普通技术人员而言，在不脱离本公开的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本公开的保护范围。

Claims (10)

  1. 一种显示面板的驱动方法，所述显示面板包括多条电源线，每条电源线连接多个像素，且每条电源线的一端连接电源，其中，所述显示面板的驱动方法包括：
    获取电源线中的电流值，所述电流值是所述电源线在所述电源与第一像素之间的部分中的电流值，所述第一像素是与所述电源线相连的全部像素中距离所述电源最近的像素；
    将所获取的电流值与预设的阈值比较；以及
    当所述电源线中的电流值小于或等于所述阈值时，向与所述电源线相连的像素提供原数据电压；当所述电源线中的电流值大于所述阈值时，向与所述电源线相连的像素提供补偿数据电压，所述补偿数据电压等于所述原数据电压与补偿电压的差，在电流值相同的情况下，等效距离越大的像素对应的补偿电压越大，所述等效距离是所述像素沿与其相连的电源线的轨迹到所述电源的距离。
  2. 根据权利要求1所述的显示面板的驱动方法，其中，
    所述电流值是一帧画面中所述电源线在所述电源与所述第一像素之间的部分中的电流的平均值；
    所述向与所述电源线相连的像素提供原数据电压包括：在下一帧画面中，向与所述电源线相连的全部像素提供所述原数据电压；
    所述向与所述电源线相连的像素提供补偿数据电压包括：在下一帧画面中，向与所述电源线相连的全部像素提供所述补偿数据电压。
  3. 根据权利要求1所述的显示面板的驱动方法，其中，
    所述电流值是所述电源线中实时的电流值，且与所述电源线相连的各像素分别与不同的栅极线相连；
    所述向与所述电源线相连的像素提供原数据电压包括：向与所述电源线相连的下一个像素提供所述原数据电压；
    所述向与所述电源线相连的像素提供补偿数据电压包括：向与所述电源线相连的下一个像素提供所述补偿数据电压。
  4. 根据权利要求1所述的显示面板的驱动方法，其中，
    所述电流值根据与所述电源线相连的像素的灰阶值计算得到；或者，
    所述电流值通过检测得到。
  5. 根据权利要求1所述的显示面板的驱动方法，其中，与像素i对应的补偿电压ΔVi根据以下公式计算：
    ΔVi＝I×di×ρ/A；其中I为与像素i相连的电源线中的电流值，di为像素i对应的等效距离，ρ为电源线的材料的电阻率，A为电源线的横截面积。
  6. 根据权利要求1所述的显示面板的驱动方法，其中，
    所述电源线沿列方向设置，与其相连的像素位于多个不同行中；则与像素i对应的补偿电压ΔVi根据以下公式计算：
    ΔVi＝I×[R1+ΔR×(n-1)]；其中I为与像素i相连的电源线中的电流值，R1为第1行像素与电源间的电源线的电阻，ΔR两相邻行像素间的电源线的电阻，n为像素i所在的行数。
  7. 一种显示面板，包括：
    多条电源线，每条电源线连接多个像素，且每条电源线的一端连接电源；
    电流获取单元，其被配置为获取电源线中的电流值，所述电流值是所述电源线在所述电源与第一像素之间的部分中的电流值，所述第一像素是与所述电源线相连的全部像素中距离所述电源最近的像素；
    比较单元，其被配置为将所获取的电流值与预设的阈值比较；
    数据电压提供单元，其被配置为在所述电源线中的电流值小于或等于所述阈值时，向与所述电源线相连的像素提供原数据电压；在所述电源线中的电流值大于所述阈值时，向与所述电源线相连的像素提供补偿数据电压，所述补偿数据电压等于所述原数据电压与补偿电压的差，在电流值相同的情况下，等效距离越大的像素对应的补偿电压越大，所述等效距离是所述像素沿与其相连的电源线的轨迹到所述电源的距离。
  8. 根据权利要求7所述的显示面板，其中，
    所述电流值是一帧画面中所述电源线在所述电源与所述第一像素之间的部分中的电流的平均值；
    在所述电源线中的电流值小于或等于所述阈值时，所述数据电压提供单元被配置为在下一帧画面中向与所述电源线相连的全部像素提供所述原数据电压；
    在所述电源线中的电流值大于所述阈值时，所述数据电压提供单元被配置为在下一帧画面中向与所述电源线相连的全部像素提供所述补偿数据电压。
  9. 根据权利要求7所述的显示面板，其中，
    所述电流值是所述电源线中实时的电流值，且与所述电源线相连的各像素分别与不同的栅极线相连；
    在所述电源线中的电流值小于或等于所述阈值时，所述数据电压提供单元被配置为向与所述电源线相连的下一个像素提供原数据电压；
    在所述电源线中的电流值大于所述阈值时，所述数据电压提供单元被配置为向与所述电源线相连的下一个像素提供补偿数据电压。
  10. 根据权利要求7所述的显示面板，其中，所述电流获取单元包括：
    电流计算模块，其被配置为根据与所述电源线相连的像素的灰阶值计算得到所述电流值；或者，
    电流检测模块，其被配置为检测所述电源线中的电流值。
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CN104821152A (zh) * 2015-05-28 2015-08-05 深圳市华星光电技术有限公司 补偿amoled电压降的方法及系统
CN106128359A (zh) * 2016-09-06 2016-11-16 昆山国显光电有限公司 Oled 显示装置及其亮度补偿方法
CN107180613A (zh) * 2017-05-26 2017-09-19 京东方科技集团股份有限公司 有机发光二极管显示面板及其驱动方法

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