WO2020107848A1 - 显示面板内部电源的压降补偿系统及方法 - Google Patents

显示面板内部电源的压降补偿系统及方法 Download PDF

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Publication number
WO2020107848A1
WO2020107848A1 PCT/CN2019/089642 CN2019089642W WO2020107848A1 WO 2020107848 A1 WO2020107848 A1 WO 2020107848A1 CN 2019089642 W CN2019089642 W CN 2019089642W WO 2020107848 A1 WO2020107848 A1 WO 2020107848A1
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Prior art keywords
voltage
elvdd
row
display panel
real
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PCT/CN2019/089642
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English (en)
French (fr)
Inventor
陈心全
胥春生
张小宝
王峥
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
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Publication of WO2020107848A1 publication Critical patent/WO2020107848A1/zh
Priority to US16/984,517 priority Critical patent/US11183121B2/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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]
    • G09G3/3275—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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
    • 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

Definitions

  • the present disclosure relates to the field of display technology, and particularly to a voltage drop compensation system and method for an internal power supply of a display panel.
  • Organic light emitting diode (Organic Light Emitting Diode, OLED for short), as a current-type light-emitting device, is more and more popular because of its many characteristics such as self-luminescence, fast response, wide viewing angle, and can be made on a flexible substrate. Used in high-performance display fields such as flexible display panels.
  • the voltage ELVDD electroluminescence positive voltage power supply
  • the voltage ELVDD has different levels of voltage drop.
  • crosstalk effect also known as cross effect, that is, the phenomenon of mutual influence between the display areas in the matrix display, For example, a certain row or column in the matrix will affect the display of other rows or columns in the matrix.
  • the present disclosure provides a voltage drop compensation system and method for the internal power supply of the display panel, which are used to solve the technical problems of poor uniformity of screen brightness and high power consumption of the entire screen caused by the internal power supply voltage drop of the display panel.
  • an embodiment of the present disclosure provides a voltage drop compensation system for an internal power supply of a display panel, including: a voltage detection circuit and a voltage compensation circuit, wherein the voltage detection circuit is electrically connected to each row of pixel units of the display panel through an ELVDD signal line For detecting the ELVDD voltage of each row of pixel units; voltage compensation circuit for compensating the data voltage of each row of pixel units according to the detected ELVDD voltage, so that the difference between the data voltage of each row of pixel units and the respective ELVDD voltage The absolute value is the same.
  • the ELVDD signal lines are respectively electrically connected to m rows of pixel units of the display panel; wherein, the m rows of pixel units of the display panel are divided in the extending direction of the ELVDD signal lines N segmented areas; at least one area of the n segmented areas is provided with a voltage detection point, the voltage detection point is electrically connected to the voltage detection circuit; wherein, m is the display panel The total number of rows of pixel units, where m ⁇ 1, n ⁇ 1.
  • the voltage detection circuit is specifically used for:
  • the voltage compensation circuit is specifically used for:
  • the offset adjust the offset of the Gamma power supply voltage so that the voltage difference between the real-time voltage ELVDD(1) and the peak voltage VGMP output from the Gamma power supply remains unchanged, and the peak voltage VGMP and the valley of the Gamma power supply output The voltage difference of the voltage VGSP remains unchanged; wherein, the Gamma power supply is used to provide a compensation voltage to each pixel unit.
  • the voltage compensation circuit is further used for:
  • the data voltage Vdata(i) of the pixel unit in the i-th row is shifted proportionally so that
  • the present disclosure provides a voltage drop compensation method for an internal power supply of a display panel, which is applied to a voltage drop compensation system for an internal power supply of a display panel including a voltage detection circuit and a voltage compensation circuit, wherein the voltage detection circuit
  • the pixel units of each row of the display panel are electrically connected through the ELVDD signal line; the method includes:
  • the voltage compensation circuit compensates the data voltage of each row of pixel units according to the detected ELVDD voltage, so that the absolute value of the difference between the data voltage of each row of pixel units and the respective ELVDD voltage is the same.
  • the ELVDD signal lines are respectively electrically connected to m rows of pixel units of the display panel; wherein, the m rows of pixel units of the display panel are divided in the extending direction of the ELVDD signal lines N segmented areas; at least one area of the n segmented areas is provided with a voltage detection point, the voltage detection point is electrically connected to the voltage detection circuit; wherein, m is the display panel The total number of rows of pixel units, where m ⁇ 1, n ⁇ 1.
  • the detecting the ELVDD voltage of each row of pixel units includes:
  • the method further includes: through the voltage compensation circuit:
  • the offset adjust the offset of the Gamma power supply voltage so that the voltage difference between the real-time voltage ELVDD(1) and the peak voltage VGMP output from the Gamma power supply remains unchanged, and the peak voltage VGMP and the valley of the Gamma power supply output The voltage difference of the voltage VGSP remains unchanged; wherein, the Gamma power supply is used to provide a compensation voltage to each pixel unit.
  • the data voltage of each row of pixel units is compensated according to the detected ELVDD voltage, including:
  • the data voltage Vdata(i) of the pixel unit in the i-th row is shifted proportionally so that
  • the voltage drop compensation system for an internal power supply of a display panel includes: a voltage detection circuit and a voltage compensation circuit, wherein the voltage detection circuit and each row of the display panel pass the ELVDD signal line
  • the pixel unit is electrically connected to detect the ELVDD voltage of each row of pixel units; the voltage compensation circuit is used to compensate the data voltage of each row of pixel units according to the detected ELVDD voltage, so that the data voltage of each row of pixel units and the respective ELVDD The absolute value of the voltage difference is the same.
  • the voltage detection circuit can implement real-time voltage acquisition of the pixel units of each row, the data voltage of each row of pixel units can be compensated by the voltage compensation circuit according to the real-time voltage of the pixel units of each row.
  • the absolute value of the difference between the data voltage of each row of pixel units and the respective ELVDD voltage By controlling the absolute value of the difference between the data voltage of each row of pixel units and the respective ELVDD voltage, the brightness uniformity and stability of the display panel can be improved under high refresh rate conditions, and the crosstalk effect can be effectively reduced to reduce the entire screen Power consumption.
  • FIG. 1 is a schematic structural diagram of an existing display panel
  • FIG. 2 is a schematic structural diagram of a voltage drop compensation system for an internal power supply of a display panel according to Embodiment 1 of the present disclosure
  • FIG. 3 is a schematic structural diagram of a voltage drop compensation system for an internal power supply of a display panel according to Embodiment 2 of the present disclosure
  • FIG. 4 is a schematic flowchart of a voltage drop compensation method for an internal power supply of a display panel according to Embodiment 3 of the present disclosure.
  • the display panel includes a plurality of scan lines GL, a plurality of data lines DL, and a plurality of pixel units arranged in a matrix forming a plurality of rows and columns (not shown) Marked), each pixel unit is provided with a pixel drive circuit 11, for example, the pixel drive circuit 11 is the most common 2T1C structure (including switching thin film transistors, drive thin film transistors, storage capacitors and organic light-emitting diodes), each pixel drive circuit 11 Both are driven by a scanning line GL and a data line DL.
  • 2T1C structure including switching thin film transistors, drive thin film transistors, storage capacitors and organic light-emitting diodes
  • the display panel also includes a power supply chip (not shown) and a plurality of power supply voltage signal lines PL connected to the power supply chip.
  • the power supply chip is used to provide the power supply voltage ELVDD, the power supply voltage
  • the signal line PL is used to transfer the power supply voltage ELVDD to the pixel driving circuit 11 in each pixel unit.
  • the pixel driving circuit 11 of each column of pixel units outputs the power supply voltage ELVDD through one power supply voltage signal line PL, that is, there are Y power supply voltage signal lines PL, each X pixel driving circuits 11 are connected in series on the power supply voltage signal line PL.
  • the present disclosure aims to provide a pixel arrangement structure and a display device of a display panel, so as to improve the pixel aperture ratio of the organic light emitting diode display panel.
  • the voltage drop compensation system of this embodiment includes: a voltage detection circuit 22 and a voltage compensation circuit 23, wherein the voltage detection circuit 22 is electrically connected to each row of pixel units 25 of the display panel through the ELVDD signal line 24 For detecting the ELVDD voltage of each row of pixel units 25; a voltage compensation circuit 23 is used to compensate the data voltage of each row of pixel units 25 according to the detected ELVDD voltage, so that the data voltage of each row of pixel units 25 and the respective ELVDD voltage The absolute value of the difference is the same.
  • the voltage detection circuit 22 is electrically connected to the voltage detection point 26 on the ELVDD signal line 24, and the power voltage ELVDD provided by the power chip 21 transmits power to the ELVDD signal line 24.
  • the ELVDD signal lines 24 are respectively electrically connected to m rows of pixel units of the display panel; wherein, the m rows of pixel units of the display panel are divided in the extending direction of the ELVDD signal lines N segmented areas; at least one of the n segmented areas is provided with a voltage detection point 26 that is electrically connected to the voltage detection circuit 22; where m is a pixel unit of the display panel The total number of rows.
  • the voltage detection circuit 22 can detect the real-time voltage of each voltage detection point 26 in real time, wherein the real-time voltage of the voltage detection point 26 is the real-time voltage of the pixel unit row where the voltage detection point 26 is located .
  • the real-time voltage of the pixel unit in the k-th row of the display panel is recorded as ELVDD(k), where, 1 ⁇ n ⁇ m, 1 ⁇ t ⁇ n, t is the serial number of the voltage detection point.
  • the voltage detection circuit 22 can detect the real-time voltage of the pixel unit in the first row of the display panel, and record the detected real-time voltage of the pixel unit in the first row as ELVDD(1), Then use the linear interpolation method to calculate the real-time voltage of any other row of pixel units on the display panel.
  • the calculation formula is as follows:
  • the real-time voltage of any other row of pixel units can be calculated by linear interpolation based on the real-time voltage measured by a limited number of voltage detection points 26.
  • This method can reduce the complexity of the voltage detection circuit 22, reduce the number of voltage detection points, and quickly and accurately obtain the real-time voltage of any row of pixel units.
  • the absolute value of the difference between the real-time voltage of the pixel unit in the i-th row of the display panel and the detected real-time voltage in the pixel unit in the first row can be obtained by the voltage compensation circuit 23, and the absolute value is recorded as
  • the difference between the real-time voltage and the data voltage of any row of pixel units of the display panel is the same constant, the coupling frequency of the ELVDD voltage and the data voltage can be reduced, and the brightness stability of the display panel can be improved. Since the absolute value of the difference between the real-time voltage of any row of pixel units in the display panel other than the first row of pixel units and the real-time voltage of the first row of pixel units is equal, the brightness uniformity of the display panel can be improved to effectively improve the display of the display panel effect.
  • the voltage detection circuit electrically connected to the ELVDD signal line is provided to detect the ELVDD voltage of each row of pixel units in real time; the voltage compensation circuit compensates the data voltage of each row of pixel units according to the detected ELVDD voltage to The absolute value of the difference between the data voltage of each row of pixel cells and the respective ELVDD voltage is the same.
  • the voltage detection circuit can implement real-time voltage acquisition of the pixel units of each row, the data voltage of each row of pixel units can be compensated by the voltage compensation circuit according to the real-time voltage of the pixel units of each row.
  • the absolute value of the difference between the data voltage of each row of pixel units and the respective ELVDD voltage By controlling the absolute value of the difference between the data voltage of each row of pixel units and the respective ELVDD voltage, the brightness uniformity and stability of the display panel can be improved under high refresh rate conditions, and the crosstalk effect can be effectively reduced to reduce the entire screen Power consumption.
  • the voltage drop compensation system of this embodiment includes a voltage detection circuit 22 and a voltage compensation circuit 23, wherein the voltage detection circuit 22 is electrically connected to the voltage detection point 26 on the ELVDD signal line 24, and the power chip
  • the supplied power voltage ELVDD 21 transfers power to the ELVDD signal line 24;
  • the voltage detection circuit 22 is electrically connected to each row of pixel units 25 of the display panel through the ELVDD signal line 24 for detecting the ELVDD voltage of each row of pixel units 25;
  • the voltage compensation circuit 23 For compensating the data voltage of each row of pixel units 25 according to the detected ELVDD voltage, so that the absolute value of the difference between the data voltage of each row of pixel units 25 and the respective ELVDD voltage is the same.
  • the voltage compensation circuit 23 is also electrically connected to the Gamma power supply 27 for automatically compensating the output voltage of the Gamma power supply.
  • the voltage compensation circuit 23 obtains the real-time voltage ELVDD(1) of the pixel unit in the first row of the display panel; then obtains the offset between the real-time voltage ELVDD(1) and the preset voltage; Offset, adjust the offset of the Gamma power supply 27 voltage, so that the voltage difference between the real-time voltage ELVDD(1) and the peak voltage VGMP output from the Gamma power supply remains unchanged, and the peak voltage VGMP and the low valley voltage VGSP output from the Gamma power supply The difference remains unchanged; wherein, the Gamma power supply is used to provide a compensation voltage to each pixel unit.
  • the voltage difference between the voltage ELVDD and the peak voltage VGMP output by the Gamma power supply by adjusting the offset of the Gamma power supply voltage, the voltage difference between the voltage ELVDD and the peak voltage VGMP output by the Gamma power supply, the voltage difference between the peak voltage VGMP and the peak voltage VGSP remain unchanged, so that the pixel units of each row can be realized
  • the data voltage is adaptively compensated.
  • the voltage detection circuit electrically connected to the ELVDD signal line is provided to detect the ELVDD voltage of each row of pixel units in real time; the voltage compensation circuit compensates the data voltage of each row of pixel units according to the detected ELVDD voltage to The absolute value of the difference between the data voltage of each row of pixel cells and the respective ELVDD voltage is the same.
  • the voltage detection circuit can implement real-time voltage acquisition of the pixel units of each row, the data voltage of each row of pixel units can be compensated by the voltage compensation circuit according to the real-time voltage of the pixel units of each row.
  • the absolute value of the difference between the data voltage of each row of pixel units and the respective ELVDD voltage By controlling the absolute value of the difference between the data voltage of each row of pixel units and the respective ELVDD voltage, the brightness uniformity and stability of the display panel can be improved under high refresh rate conditions, and the crosstalk effect can be effectively reduced to reduce the entire screen Power consumption.
  • FIG. 4 is a schematic flowchart of a voltage drop compensation method for an internal power supply of a display panel according to Embodiment 3 of the present disclosure. As shown in FIG. 4, the method of this embodiment may include:
  • the method in this embodiment is applied to a voltage drop compensation system of an internal power supply of a display panel including a voltage detection circuit and a voltage compensation circuit, wherein the voltage detection circuit connects each row of pixel units of the display panel through the ELVDD signal line It is electrically connected to detect the ELVDD voltage of each row of pixel units.
  • the ELVDD signal lines are respectively electrically connected to m rows of pixel units of the display panel; wherein, the m rows of pixel units of the display panel are divided into n segmented regions in the extending direction of the ELVDD signal lines; at least one of the n segmented regions A voltage detection point is provided in the area, and the voltage detection point is electrically connected to the voltage detection circuit; where m is the total number of rows of pixel units of the display panel.
  • the real-time voltage of the pixel unit in the k-th row of the display panel is obtained, and the real-time voltage is recorded as ELVDD(k), where, 1 ⁇ n ⁇ m, 1 ⁇ t ⁇ n, t is the serial number of the voltage detection point;
  • S102 Compensate the data voltage of each row of pixel units according to the detected ELVDD voltage, so that the absolute value of the difference between the data voltage of each row of pixel units and the respective ELVDD voltage is the same.
  • This step is implemented by a voltage compensation circuit.
  • the absolute value of the difference between the real-time voltage of the pixel unit of the i-th row of the display panel and the detected real-time voltage of the pixel unit of the first-row row is recorded as
  • are shifted in proportion to the data voltage Vdata(i) of the pixel unit in the i-th row, so that
  • the method in this embodiment may further include the following steps:
  • the offset adjust the offset of the Gamma power supply voltage so that the voltage difference between the real-time voltage ELVDD(1) and the peak voltage VGMP output from the Gamma power supply remains unchanged, and the peak voltage VGMP and the valley of the Gamma power supply output The voltage difference of the voltage VGSP remains unchanged; wherein, the Gamma power supply is used to provide a compensation voltage to each pixel unit.
  • the method in this embodiment can be applied to the voltage drop compensation system of the internal power supply of the display panel shown in FIGS. 2 and 3.
  • the specific implementation process and technical principle please refer to the description of the related content in FIGS. 2 and 3. Here No longer.
  • the terms “installation”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, Or integrally formed, it can be mechanical connection, electrical connection or communication with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction between two components.
  • installation can be a fixed connection or a detachable connection, Or integrally formed, it can be mechanical connection, electrical connection or communication with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction between two components.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
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Abstract

一种显示面板内部电源的压降补偿系统及方法，用于解决显示面板内部电源压降造成的屏幕亮度均一性差、整屏功耗高的技术问题。所述压降补偿系统包括：电压侦测电路（22）、电压补偿电路（23），其中电压侦测电路（22）用于检测各行像素单元的ELVDD电压；电压补偿电路（23），用于根据检测到的ELVDD电压，对各行像素单元的数据电压进行补偿。

Description

显示面板内部电源的压降补偿系统及方法 技术领域
本公开涉及显示技术领域，尤e其涉及一种显示面板内部电源的压降补偿系统及方法。
背景技术
有机发光二极管(Organic Light Emitting Diode，简称OLED)作为一种电流型发光器件，因其所具有自发光、快速响应、宽视角和可制作在柔性基板上等多种特点而越来越多地被应用于高性能显示领域如柔性显示面板中。电源电压信号线输出的电压ELVDD(电致发光正压电源)被传输至各行像素单元，但是，随着显示屏的不断增大，电源电压信号线的走线阻抗增加，造成电源电压信号线输出的电压ELVDD存在不同程度的电压降。从而导致不同行像素单元流过的电流均不同，使得显示面板存在亮度均一性差、整屏功耗大、cross talk效应(又称交叉效应，即在矩阵显示中显示区域之间相互影响的现象，例如矩阵中的某一行或列，会对矩阵中的其他行或者列的显示产生影响)严重的问题。
现有技术中，主要依靠显示面板制作工艺或者制作材料的提升来改善显示面板的亮度均一性，以及通过优化驱动芯片的驱动能力来降低cross talk效应。
但是，制作工艺或者制作材料的提升难度较大，且其对显示面板的亮度均一性的改善效果不佳。而采用优化驱动芯片的驱动能力来改善cross talk效应，其改善程度十分有限，且容易对显示面板的显示画面造成负面影响。
发明内容
针对上述缺陷，本公开提供一种显示面板内部电源的压降补偿系统及方法，用于解决显示面板内部电源压降造成的屏幕亮度均一性差、整屏功耗高的技术问题。
第一方面，本公开实施例提供一种显示面板内部电源的压降补偿系统，包括：电压侦测电路、电压补偿电路，其中电压侦测电路通过ELVDD信号线与显示面板的各行像素单元电连接，用于检测各行像素单元的ELVDD电压；电压补偿电路，用于根据检测到的ELVDD电压，对各行像素单元的数据电压进行补偿，以使得各行像素单元的数据电压与 各自的ELVDD电压之差的绝对值相同。
在一种可选的实施方式中，所述ELVDD信号线分别与显示面板的m行像素单元电连接；其中，所述显示面板的m行像素单元在所述ELVDD信号线的延伸方向上被划分为n个分段区域；在所述n个分段区域的至少一个区域内设置有电压侦测点，所述电压侦测点与所述电压侦测电路电连接；其中，m为显示面板的像素单元总行数，其中m≥1，n≥1。
在一种可选的实施方式中，所述电压侦测电路，具体用于：
获取显示面板第k行像素单元的实时电压，该实时电压记为ELVDD(k)，其中，
Figure PCTCN2019089642-appb-000001
1≦n≦m，1≦t≦n，t为电压侦测点的序号；
将侦测的第1行像素单元的实时电压记为ELVDD(1)，采用线性插值法计算显示面板其余任意一行像素单元的实时电压，计算公式如下：
Figure PCTCN2019089642-appb-000002
其中：ELVDD(i)为第i行像素单元的实时电压，i＝2,3…,m。
在一种可选的实施方式中，所述电压补偿电路，具体用于：
获取显示面板第1行像素单元的实时电压ELVDD(1)；
获取所述实时电压ELVDD(1)与预设电压的偏移量；
根据所述偏移量，调整Gamma电源电压的偏移量，以使得所述实时电压ELVDD(1)与Gamma电源输出的峰值电压VGMP的压差保持不变，峰值电压VGMP与Gamma电源输出的低谷电压VGSP的压差保持不变；其中，所述Gamma电源用于向各像素单元提供补偿电压。
在一种可选的实施方式中，所述电压补偿电路，还用于：
获取显示面板第i行像素单元的实时电压与侦测的第1行像素单元的实时电压之差的绝对值，记为|ELVDD(i)-ELVDD(1)|；
根据|ELVDD(i)-ELVDD(1)|的值，对第i行像素单元的数据电压Vdata(i)进行等比例偏移，以使得|ELVDD(i)-Vdata(i)|为同一常数。
第二方面，本公开提供一种显示面板内部电源的压降补偿方法，应用在包含电压侦测电路、电压补偿电路的显示面板内部电源的压降补偿系统中，其中，所述电压侦测电路通过ELVDD信号线与显示面板的各行像素单元电连接；所述方法包括：
通过所述电压侦测电路检测各行像素单元的ELVDD电压；
通过所述电压补偿电路根据检测到的ELVDD电压，对各行像素单元的数据电压进行补偿，以使得各行像素单元的数据电压与各自的ELVDD电压之差的绝对值相同。
在一种可选的实施方式中，所述ELVDD信号线分别与显示面板的m行像素单元电连接；其中，所述显示面板的m行像素单元在所述ELVDD信号线的延伸方向上被划分为n个分段区域；在所述n个分段区域的至少一个区域内设置有电压侦测点，所述电压侦测点与所述电压侦测电路电连接；其中，m为显示面板的像素单元总行数，其中m≥1，n≥1。
在一种可选的实施方式中，所述检测各行像素单元的ELVDD电压，包括：
获取显示面板第k行像素单元的实时电压，该实时电压记为ELVDD(k)，其中，
Figure PCTCN2019089642-appb-000003
1≦n≦m，1≦t≦n，t为电压侦测点的序号；
将侦测的第1行像素单元的实时电压记为ELVDD(1)，采用线性插值法计算显示面板其余任意一行像素单元的实时电压，计算公式如下：
Figure PCTCN2019089642-appb-000004
其中：ELVDD(i)为第i行像素单元的实时电压，i＝2,3…,m。
在一种可选的实施方式中，还包括，通过所述电压补偿电路：
获取显示面板第1行像素单元的实时电压ELVDD(1)；
获取所述实时电压ELVDD(1)与预设电压的偏移量；
根据所述偏移量，调整Gamma电源电压的偏移量，以使得所述实时电压ELVDD(1)与Gamma电源输出的峰值电压VGMP的压差保持不变，峰值电压VGMP与Gamma电源输出的低谷电压VGSP的压差保持不变；其中，所述Gamma电源用于向各像素单元提供补偿电压。
在一种可选的实施方式中，根据检测到的ELVDD电压，对各行像素单元的数据电压进行补偿，包括：
获取显示面板第i行像素单元的实时电压与侦测的第1行像素单元的实时电压之差的绝对值，记为|ELVDD(i)-ELVDD(1)|；
根据|ELVDD(i)-ELVDD(1)|的值，对第i行像素单元的数据电压Vdata(i)进行等比例偏移，以使得|ELVDD(i)-Vdata(i)|为同一常数。
本公开提供的显示面板内部电源的压降补偿系统及方法，显示面板内部电源的压降补偿系统包括：电压侦测电路、电压补偿电路，其中电压侦测电路通过ELVDD信号线与显示面板的各行像素单元电连接，用于检测各行像素单元的ELVDD电压；电压补偿电路，用于根据检测到的ELVDD电压，对各行像素单元的数据电压进行补偿，以使得各行像素单元的数据电压与各自的ELVDD电压之差的绝对值相同。由于电压侦测电路可以实施获取各行像素单元的实时电压，从而可以通过电压补偿电路根据各行像素单元的实时电压分别对各行像素单元的数据电压进行补偿。通过控制各行像素单元的数据电压与各自的ELVDD电压之差的绝对值相同，可以在高刷新率条件下，提升显示面板的亮度均一性、稳定性，并且可以有效减弱cross talk效应，降低整屏功耗。
附图说明
图1是现有的显示面板的结构示意图；
图2为本公开实施例一提供的显示面板内部电源的压降补偿系统的结构示意图；
图3为本公开实施例二提供的显示面板内部电源的压降补偿系统的结构示意图；
图4为本公开实施例三提供的显示面板内部电源的压降补偿方法的流程示意图。
图中：
11-像素驱动电路；
21-ELVDD；
22-电压侦测电路；
23-电压补偿电路；
24-ELVDD信号线；
25-像素单元；
26-电压侦测点；
27-Gamma电源。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。
基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。在不冲突的情况下，下述的实施例及实施例中的特征可以相互组合。
图1是现有的显示面板的结构示意图，如图1所示，显示面板包含多条扫描线GL、多条数据线DL和形成多行多列的呈矩阵排列的多个像素单元(图未标注)，每个像素单元内设有像素驱动电路11，像素驱动电路11例如为最常见的2T1C结构(包括开关薄膜晶体管、驱动薄膜晶体管、存储电容以及有机发光二极管)，每个像素驱动电路11均由一条扫描线GL和一条数据线DL驱动，显示面板还包括电源芯片(图未绘示)以及与电源芯片相连的多根电源电压信号线PL，电源芯片用于提供电源电压ELVDD，电源电压信号线PL用于将电源电压ELVDD传输至每一个像素单元内的像素驱动电路11。
如图1所示，假设显示面板具有X行Y列的像素单元，每列像素单元的像素驱动电路11通过一条电源电压信号线PL输出电源电压ELVDD，即共有Y条电源电压信号线PL，每条电源电压信号线PL上依次串接X个像素驱动电路11。在对传输电源电压ELVDD的电源电压信号线PL的阻抗忽略不计的理想情况下，流经每个像素驱动电路11的电流是相同的，但实际情况下，由于电源电压信号线PL是不可避免的存在一定的走线阻抗，且随着显示面板屏幕尺寸的增大、分辨率越高，电源电压信号线PL就越长，阻抗也就越大，电源电压ELVDD会在电源电压信号线PL上产生电压降(IR Drop)，在显示面板中靠近电源芯片区域的电源电压要比远离电源芯片的电源电压高，从而流过不同位置的像素驱动电路11的电流均不同，导致显示面板的亮度存在均一性差、稳定性低的问题；尤其在高刷新频率条件下，cross talk效应严重。
针对上述问题，本公开旨在提供一种显示面板的像素排列结构及显示装置，以提升有机发光二极管显示面板的像素开口率。
图2为本公开实施例一提供的显示面板内部电源的压降补偿系统的结构示意图。如图2所示，本实施例的压降补偿系统包括：电压侦测电路22、电压补偿电路23，其中电压侦测电路22通过ELVDD信号线24与显示面板的各行像素单元25电连接，用于检测各行像素单元25的ELVDD电压；电压补偿电路23，用于根据检测到的ELVDD电压，对各行像素单元25的数据电压进行补偿，以使得各行像素单元25的数据电压与各自的ELVDD电压之差的绝对值相同。其中，电压侦测电路22与ELVDD信号线24上的电压侦测点26电连接，电源芯片提供的电源电压ELVDD 21向ELVDD信号线24传输电能。
在一种可选的实施方式中，参阅图2，假设ELVDD信号线24分别与显示面板的m行像素单元电连接；其中，显示面板的m行像素单元在ELVDD信号线的延伸方向上被划分为n个分段区域；在n个分段区域的至少一个区域内设置有电压侦测点26，该电压侦测点26与电压侦测电路22电连接；其中，m为显示面板的像素单元总行数。
在本实施例中，电压侦测电路22可以实时侦测各个电压侦测点26的实时电压，其中，电压侦测点26的实时电压即为该电压侦测点26所在像素单元行的实时电压。为了方便描述，将显示面板第k行像素单元的实时电压记为ELVDD(k)，其中，
Figure PCTCN2019089642-appb-000005
1≦n≦m，1≦t≦n，t为电压侦测点的序号。
在一种可选的实时方式中，可以通过电压侦测电路22侦测显示面板的第1行像素单元的实时电压，将侦测的第1行像素单元的实时电压记为ELVDD(1)，然后采用线性插值法计算显示面板其余任意一行像素单元的实时电压，计算公式如下：
Figure PCTCN2019089642-appb-000006
其中：ELVDD(i)为第i行像素单元的实时电压，i＝2,3…,m。
本实施例中，可以在已知第1行像素单元的实时电压之后，依据有限数量的电压侦测点26测量到的实时电压，采用线性插值的方法计算出其余任意行像素单元的实时电压。这种方式可以减少电压侦测电路22的复杂度，缩减电压侦测点的数量，迅速、精确地获取任意行像素单元的实时电压。
在一种可选的实时方式中，可以由电压补偿电路23获取显示面板第i行像素单元的实时电压与侦测的第1行像素单元的实时电压之差的绝对值，该绝对值记为|ELVDD(i)-ELVDD(1)|；然后根据|ELVDD(i)-ELVDD(1)|的值，对第i行像素单元的数据电压Vdata(i)进行等比例偏移，以使得|ELVDD(i)-Vdata(i)|为同一常数。
本实施例中，由于显示面板任意行像素单元的实时电压与数据电压的差值都为同一常数，因此可以降低ELVDD电压与数据电压的耦合频率，提升显示面板的亮度稳定性。由于显示面板除第1行像素单元外的任意行像素单元的实时电压与第1行像素单元的实时电压之差的绝对值相等，因此可以提升显示面板的亮度均一性，有效改善显示面板的显示效果。
本实施例，通过设置与ELVDD信号线电连接的电压侦测电路来实时侦测各行像素单元的ELVDD电压；通过电压补偿电路根据检测到的ELVDD电压，对各行像素单元的数据电压进行补偿，以使得各行像素单元的数据电压与各自的ELVDD电压之差的绝对值相 同。
由于电压侦测电路可以实施获取各行像素单元的实时电压，从而可以通过电压补偿电路根据各行像素单元的实时电压分别对各行像素单元的数据电压进行补偿。通过控制各行像素单元的数据电压与各自的ELVDD电压之差的绝对值相同，可以在高刷新率条件下，提升显示面板的亮度均一性、稳定性，并且可以有效减弱cross talk效应，降低整屏功耗。
图3为本公开实施例二提供的显示面板内部电源的压降补偿系统的结构示意图。如图3所示，本实施例的压降补偿系统包括：电压侦测电路22、电压补偿电路23，其中电压侦测电路22与ELVDD信号线24上的电压侦测点26电连接，电源芯片提供的电源电压ELVDD 21向ELVDD信号线24传输电能；电压侦测电路22通过ELVDD信号线24与显示面板的各行像素单元25电连接，用于检测各行像素单元25的ELVDD电压；电压补偿电路23，用于根据检测到的ELVDD电压，对各行像素单元25的数据电压进行补偿，以使得各行像素单元25的数据电压与各自的ELVDD电压之差的绝对值相同。其中，电压补偿电路23还与Gamma电源27电连接，用于自动对Gamma电源的输出电压进行补偿。
在一种可选的实施方式中，电压补偿电路23获取显示面板第1行像素单元的实时电压ELVDD(1)；然后获取实时电压ELVDD(1)与预设电压的偏移量；最后根据该偏移量，调整Gamma电源27电压的偏移量，以使得实时电压ELVDD(1)与Gamma电源输出的峰值电压VGMP的压差保持不变，峰值电压VGMP与Gamma电源输出的低谷电压VGSP的压差保持不变；其中，所述Gamma电源用于向各像素单元提供补偿电压。
本实施例中，通过调整Gamma电源电压的偏移量，使得电压ELVDD与Gamma电源输出的峰值电压VGMP的压差、峰值电压VGMP与峰值电压VGSP的压差不变，从而可以实现对各行像素单元的数据电压进行自适应补偿。
本实施例，通过设置与ELVDD信号线电连接的电压侦测电路来实时侦测各行像素单元的ELVDD电压；通过电压补偿电路根据检测到的ELVDD电压，对各行像素单元的数据电压进行补偿，以使得各行像素单元的数据电压与各自的ELVDD电压之差的绝对值相同。
由于电压侦测电路可以实施获取各行像素单元的实时电压，从而可以通过电压补偿电路根据各行像素单元的实时电压分别对各行像素单元的数据电压进行补偿。通过控制各行像素单元的数据电压与各自的ELVDD电压之差的绝对值相同，可以在高刷新率条件下，提升显示面板的亮度均一性、稳定性，并且可以有效减弱cross talk效应，降低整屏功耗。
图4为本公开实施例三提供的显示面板内部电源的压降补偿方法的流程示意图。如图 4所示，本实施例的方法可以包括：
S101：检测各行像素单元的ELVDD电压。
参见图1，本实施例中的方法应用在包含电压侦测电路、电压补偿电路的显示面板内部电源的压降补偿系统中，其中，电压侦测电路通过ELVDD信号线与显示面板的各行像素单元电连接，用于检测各行像素单元的ELVDD电压。ELVDD信号线分别与显示面板的m行像素单元电连接；其中，显示面板的m行像素单元在ELVDD信号线的延伸方向上被划分为n个分段区域；在n个分段区域的至少一个区域内设置有电压侦测点，电压侦测点与电压侦测电路电连接；其中，m为显示面板的像素单元总行数。
可选地，获取显示面板第k行像素单元的实时电压，该实时电压记为ELVDD(k)，其中，
Figure PCTCN2019089642-appb-000007
1≦n≦m，1≦t≦n，t为电压侦测点的序号；
将侦测的第1行像素单元的实时电压记为ELVDD(1)，采用线性插值法计算显示面板其余任意一行像素单元的实时电压，计算公式如下：
Figure PCTCN2019089642-appb-000008
其中：ELVDD(i)为第i行像素单元的实时电压，i＝2,3…,m。
S102：根据检测到的ELVDD电压，对各行像素单元的数据电压进行补偿，以使得各行像素单元的数据电压与各自的ELVDD电压之差的绝对值相同。
该步骤通过电压补偿电路实现。本实施例中，获取显示面板第i行像素单元的实时电压与侦测的第1行像素单元的实时电压之差的绝对值，记为|ELVDD(i)-ELVDD(1)|；根据|ELVDD(i)-ELVDD(1)|的值，对第i行像素单元的数据电压Vdata(i)进行等比例偏移，以使得|ELVDD(i)-Vdata(i)|为同一常数。
可选地，本实施例中的方法，还可以包括如下步骤：
获取显示面板第1行像素单元的实时电压ELVDD(1)；
获取所述实时电压ELVDD(1)与预设电压的偏移量；
根据所述偏移量，调整Gamma电源电压的偏移量，以使得所述实时电压ELVDD(1)与Gamma电源输出的峰值电压VGMP的压差保持不变，峰值电压VGMP与Gamma电源输出的低谷电压VGSP的压差保持不变；其中，所述Gamma电源用于向各像素单元提供补偿电压。
上述步骤通过所述电压补偿电路实现。
本实施例中的方法，可以应用在图2、图3中所示的显示面板内部电源的压降补偿系统中，其具体实现过程和技术原理参见图2、图3相关内容的描述，此处不再赘述。
在本公开中，除非另有明确的规定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸的连接，或一体成型，可以是机械连接，也可以是电连接或者彼此可通讯；可以是直接相连，也可以通过中间媒体间接连接，可以是两个元件内部的连通或者两个元件的互相作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本公开中的具体含义。
最后应说明的是：以上各实施例仅用以说明本公开的技术方案，而非对其限制；尽管参照前述各实施例对本公开进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本公开各实施例技术方案的范围。

Claims (12)

  1. 一种显示面板内部电源的压降补偿系统，包括：电压侦测电路、电压补偿电路，其中所述电压侦测电路通过ELVDD信号线与显示面板的各行像素单元电连接，用于检测各行像素单元的ELVDD电压；所述电压补偿电路，用于根据检测到的ELVDD电压，对各行像素单元的数据电压进行补偿，以使得各行像素单元的数据电压与各自的ELVDD电压之差的绝对值相同。
  2. 根据权利要求1所述的系统，其中，所述ELVDD信号线分别与显示面板的m行像素单元电连接，所述显示面板的m行像素单元在所述ELVDD信号线的延伸方向上被划分为n个分段区域，在所述n个分段区域的至少一个区域内设置有电压侦测点，所述电压侦测点与所述电压侦测电路电连接，其中，m为显示面板的像素单元总行数，其中m≥1，n≥1。
  3. 根据权利要求2所述的系统，其中，所述电压侦测电路，具体用于：
    获取显示面板第k行像素单元的实时电压，该实时电压记为ELVDD(k)，其中，
    Figure PCTCN2019089642-appb-100001
    1≦n≦m，1≦t≦n，t为电压侦测点的序号；
    将侦测的第1行像素单元的实时电压记为ELVDD(1)，采用线性插值法计算显示面板其余任意一行像素单元的实时电压，计算公式如下：
    Figure PCTCN2019089642-appb-100002
    其中：ELVDD(i)为第i行像素单元的实时电压，i＝2,3…,m。
  4. 根据权利要求1所述的系统，其中，所述电压补偿电路，具体用于：
    获取显示面板第1行像素单元的实时电压ELVDD(1)；
    获取所述实时电压ELVDD(1)与预设电压的偏移量。
  5. 根据权利要求4所述的系统，其中，
    根据所述偏移量，调整Gamma电源电压的偏移量，以使得所述实时电压ELVDD(1)与Gamma电源输出的峰值电压VGMP的压差保持不变，峰值电压VGMP与Gamma电源输出的低谷电压VGSP的压差保持不变，其中，所述Gamma电源用于向各像素单元提供补偿电压。
  6. 根据权利要求3所述的系统，其中，所述电压补偿电路，还用于：
    获取显示面板第i行像素单元的实时电压与侦测的第1行像素单元的实时电压之差的绝对值，记为|ELVDD(i)-ELVDD(1)|；
    根据|ELVDD(i)-ELVDD(1)|的值，对第i行像素单元的数据电压Vdata(i)进行等比例偏移，以使得|ELVDD(i)-Vdata(i)|为同一常数。
  7. 一种显示面板内部电源的压降补偿方法，应用在包含电压侦测电路、电压补偿电路的显示面板内部电源的压降补偿系统中，其中，所述电压侦测电路通过ELVDD信号线与显示面板的各行像素单元电连接；所述方法包括：
    通过所述电压侦测电路检测各行像素单元的ELVDD电压；
    通过所述电压补偿电路根据检测到的ELVDD电压，对各行像素单元的数据电压进行补偿，以使得各行像素单元的数据电压与各自的ELVDD电压之差的绝对值相同。
  8. 根据权利要求7所述的方法，其中，所述ELVDD信号线分别与显示面板的m行像素单元电连接；其中，所述显示面板的m行像素单元在所述ELVDD信号线的延伸方向上被划分为n个分段区域；在所述n个分段区域的至少一个区域内设置有电压侦测点，所述电压侦测点与所述电压侦测电路电连接；其中，m为显示面板的像素单元总行数，其中m≥1，n≥1。
  9. 根据权利要求8所述的方法，其中，所述检测各行像素单元的ELVDD电压，包括：
    获取显示面板第k行像素单元的实时电压，该实时电压记为ELVDD(k)，其中，
    Figure PCTCN2019089642-appb-100003
    1≦n≦m，1≦t≦n，t为电压侦测点的序号；
    将侦测的第1行像素单元的实时电压记为ELVDD(1)，采用线性插值法计算显示面板其余任意一行像素单元的实时电压，计算公式如下：
    Figure PCTCN2019089642-appb-100004
    其中：ELVDD(i)为第i行像素单元的实时电压，i＝2,3…,m。
  10. 根据权利要求7所述的方法，还包括，通过所述电压补偿电路：
    获取显示面板第1行像素单元的实时电压ELVDD(1)；
    获取所述实时电压ELVDD(1)与预设电压的偏移量。
  11. 根据权利要求10所述的方法，还包括，通过所述电压补偿电路：根据所述偏移 量，调整Gamma电源电压的偏移量，以使得所述实时电压ELVDD(1)与Gamma电源输出的峰值电压VGMP的压差保持不变，电压VGMP与Gamma电源输出的低谷电压VGSP的压差保持不变；其中，所述Gamma电源用于向各像素单元提供补偿电压。
  12. 根据权利要求9所述的方法，其中，根据检测到的ELVDD电压，对各行像素单元的数据电压进行补偿，包括：
    获取显示面板第i行像素单元的实时电压与侦测的第1行像素单元的实时电压之差的绝对值，记为|ELVDD(i)-ELVDD(1)|；
    根据|ELVDD(i)-ELVDD(1)|的值，对第i行像素单元的数据电压Vdata(i)进行等比例偏移，以使得|ELVDD(i)-Vdata(i)|为同一常数。
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