WO2016201735A1 - 补偿amoled电压降的系统及方法 - Google Patents

补偿amoled电压降的系统及方法 Download PDF

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Publication number
WO2016201735A1
WO2016201735A1 PCT/CN2015/083068 CN2015083068W WO2016201735A1 WO 2016201735 A1 WO2016201735 A1 WO 2016201735A1 CN 2015083068 W CN2015083068 W CN 2015083068W WO 2016201735 A1 WO2016201735 A1 WO 2016201735A1
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voltage drop
amoled
data signal
power supply
display panel
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PCT/CN2015/083068
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English (en)
French (fr)
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徐京
黄泰钧
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深圳市华星光电技术有限公司
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Priority to US14/781,307 priority Critical patent/US9892686B2/en
Publication of WO2016201735A1 publication Critical patent/WO2016201735A1/zh

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    • 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
    • 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
    • G09G3/2003—Display of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • 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
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
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    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours
    • 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a system and method for compensating for a voltage drop of an AMOLED.
  • OLED Organic Light Emitting Display
  • OLED Organic Light Emitting Display
  • the OLED display device can be divided into two types: passive matrix OLED (PMOLED) and active matrix OLED (AMOLED), namely direct addressing and thin film transistor (Thin Film Transistor, according to the driving method).
  • TFT matrix addressing two types.
  • the AMOLED has sub-pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used for a high-definition large-sized display device.
  • Each of the light-emitting units in the AMOLED is independently controlled by TFT addressing.
  • the pixel structure composed of the light emitting unit and the TFT addressing circuit needs to be driven by a DC power supply voltage (OVDD) through a power signal line.
  • OVDD DC power supply voltage
  • FIG. 1 is a schematic structural view of a large-size AMOLED display device including a display panel 1, a power supply line L for transmitting a power supply voltage OVDD, an X-direction substrate (Xboard) 3, and a flexible circuit board (Flexible Printed Circuit, FPC) 4.
  • a plurality of pixel driving circuits corresponding to n sub-pixels are sequentially connected in series to a power supply line L for transmitting a power supply voltage OVDD, where n is a positive integer greater than 1, and each prime driving circuit is
  • the conventional 2T1C structure includes a switching thin film transistor T1, a driving thin film transistor T2, a storage capacitor C, and an organic light emitting diode D.
  • the impedance of the power supply line L for transmitting the power supply voltage OVDD is negligible, and the power supply voltage OVDD has no voltage drop during transmission, so when displaying a solid color picture, it flows through each pixel driving circuit.
  • the current I is the same, and the OLED brightness should be the same in all areas with good uniformity.
  • the power supply line L for transmitting the power supply voltage OVDD inevitably has an impedance, and the power supply voltage OVDD generates a voltage drop (IR Drop) on the power supply line L, and
  • IR Drop voltage drop
  • the power supply voltage in the region near the FPC terminal 4, that is, near the power supply location is higher than the power supply voltage in the region farther from the power supply location.
  • the corresponding power supply voltage value OVDD i can be calculated by:
  • the power supply voltage OVDD i is related to the current I i flowing through the ith pixel driving circuit, different pixels have different current outputs, resulting in different brightness of different areas of the display panel, and the uniformity of the picture is poor. Affects the display quality.
  • the object of the present invention is to provide a method for compensating the voltage drop of the AMOLED, which can effectively compensate the voltage drop, solve the problem of uneven image quality of the AMOLED display panel caused by the voltage drop, and the algorithm is simple and easy to implement.
  • the present invention provides a system for compensating for a voltage drop of an AMOLED, including an AMOLED display panel, a picture detection module, a data signal correction module, and a voltage drop compensation module;
  • the AMOLED display panel includes at least a power supply line and n sub-pixels serially connected in series on the power supply line, each sub-pixel has a pixel driving circuit; and the AMOLED display panel is in a direction in which the power supply line extends. Divided into j regions, each region has n/j sub-pixels correspondingly, n, j are positive integers greater than 1, and n ⁇ j;
  • the picture detecting module is configured to detect a data signal of the picture to be displayed, determine whether the pre-display picture is a solid color picture, and send the data signal of the solid color picture to the data correction module;
  • the data correction module is configured to receive a data signal of a solid color picture to be converted, and convert a data signal to display a solid color picture;
  • the voltage drop compensation module is configured to receive a data signal to be displayed by the data correction module to display a solid color picture, and adjust the data signal variation corresponding to each of the n/j sub-pixels in each area of the AMOLED display panel.
  • the area is linearly compensated for the voltage drop in the sub-area.
  • the voltage drop compensation module performs a linear compensation of the voltage drop of the sub-regions on the j regions
  • the law is:
  • the impedance of the power supply trace corresponds to n sub-pixels serially connected in series to the power supply trace, which is equivalent to n levels;
  • the n-level impedance is divided into j segments corresponding to the j-region of the AMOLED display panel, wherein the first segment is closest to the standard power supply voltage, and the j-th terminal is farthest from the standard power supply voltage;
  • K i ( ⁇ OVDD i - ⁇ OVDD i-1 )/(n/j)
  • the voltage drop corresponding to each level of impedance in each segment is calculated, and ((i-1)n/j) ⁇ m ⁇ i(n/ j), the voltage drop ⁇ OVDD m corresponding to the mth impedance in the i-th segment is:
  • ⁇ OVDD m ⁇ OVDD i-1 +K i (m-(i-1)n/j))
  • the voltage drop of the sub-region is linearly compensated for the j regions, and the data signal of the mth sub-pixel in the i-th region of the corresponding AMOLED display panel is adjusted according to the calculated ⁇ OVDD m corresponding to the mth-order impedance in the i-th segment.
  • the amount of change ⁇ VData m is the amount of change ⁇ VData m :
  • the system for compensating for the voltage drop of the AMOLED further includes a frame rate control module or a jitter display module.
  • the data signal correction module converts the data signal of the solid color picture from 8 bits to 10 bits using the GAMMA curve.
  • the power supply trace extends in a vertical direction, the AMOLED display panel is divided into j regions in a vertical direction; or the power supply trace extends in a horizontal direction, and the AMOLED display panel is divided in a horizontal direction For j areas.
  • the invention also provides a system for compensating the voltage drop of an AMOLED, comprising an AMOLED display panel, a picture detection module, a data signal correction module, and a voltage drop compensation module;
  • the AMOLED display panel includes at least a power supply line and n sub-pixels serially connected in series on the power supply line, each sub-pixel has a pixel driving circuit; and the AMOLED display panel is in a direction in which the power supply line extends. Divided into j regions, each region has n/j sub-pixels correspondingly, n, j are positive integers greater than 1, and n ⁇ j;
  • the picture detecting module is configured to detect a data signal of the picture to be displayed, determine whether the pre-display picture is a solid color picture, and send the data signal of the solid color picture to the data correction module;
  • the data correction module is configured to receive a data signal to display a solid color picture, and to display pure The data signal of the color picture is converted;
  • the voltage drop compensation module is configured to receive a data signal to be displayed by the data correction module to display a solid color picture, and adjust the data signal variation corresponding to each of the n/j sub-pixels in each area of the AMOLED display panel.
  • the area is linearly compensated for the voltage drop in the sub-area;
  • the algorithm for linearly compensating the voltage drop of the sub-areas in the j regions by the voltage drop compensation module is:
  • the impedance of the power supply trace corresponds to n sub-pixels serially connected in series to the power supply trace, which is equivalent to n levels;
  • the n-level impedance is divided into j segments corresponding to the j-region of the AMOLED display panel, wherein the first segment is closest to the standard power supply voltage, and the j-th terminal is farthest from the standard power supply voltage;
  • K i ( ⁇ OVDD i - ⁇ OVDD i-1 )/(n/j)
  • the voltage drop corresponding to each level of impedance in each segment is calculated, and ((i-1)n/j) ⁇ m ⁇ i(n/ j), the voltage drop ⁇ OVDD m corresponding to the mth impedance in the i-th segment is:
  • ⁇ OVDD m ⁇ OVDD i-1 +K i (m-(i-1)n/j))
  • the voltage drop of the sub-region is linearly compensated for the j regions, and the data signal of the mth sub-pixel in the i-th region of the corresponding AMOLED display panel is adjusted according to the calculated ⁇ OVDD m corresponding to the mth-order impedance in the i-th segment.
  • the amount of change ⁇ VData m is the amount of change ⁇ VData m :
  • the data signal correction module converts the data signal of the solid color picture from 8 bits to 10 bits by using the GAMMA curve.
  • the invention also provides a method for compensating for the voltage drop of an AMOLED, comprising the following steps:
  • Step 1 Provide a system for compensating the voltage drop of the AMOLED
  • the system for compensating the voltage drop of the AMOLED includes an AMOLED display panel, a picture detection module, a data signal correction module, and a voltage drop compensation module;
  • the AMOLED display panel includes at least a power supply line and n sub-pixels serially connected in series on the power supply line, each sub-pixel has a pixel driving circuit; and the AMOLED display panel is in a direction in which the power supply line extends. Divided into j regions, each region has n/j sub-pixels correspondingly, n, j are positive integers greater than 1, and n ⁇ j;
  • Step 2 The picture detection module detects a data signal of a picture to be displayed, and determines a pre-determination Whether the display screen is a solid color screen, and if so, transmitting the data signal of the solid color screen to the data correction module;
  • Step 3 The data correction module receives a data signal for displaying a solid color picture, and converts a data signal for displaying a solid color picture;
  • Step 4 the voltage drop compensation module receives the data signal of the solid color picture converted by the data correction module, and adjusts the data signal change amount corresponding to each of the n/j sub-pixels in each area of the AMOLED display panel.
  • the j regions do the linear compensation of the voltage drop in the sub-region.
  • the system for compensating the voltage drop of the AMOLED further includes a frame rate control module or a jitter display module; the method for compensating the voltage drop of the AMOLED further includes the step 5: performing frame rate control or jitter display by using a frame rate control module or a jitter display module, further Improve the display quality of solid-colored screens.
  • the step 4 specifically includes:
  • Step 41 The impedance of the power supply line corresponds to n sub-pixels serially connected to the power supply line in an equivalent manner to n levels;
  • Step 42 dividing the n-level impedance corresponding to the j-region of the AMOLED display panel into j segments, wherein the first segment is closest to the standard power supply voltage, and the j-th terminal is farthest from the standard power supply voltage;
  • K i ( ⁇ OVDD i - ⁇ OVDD i-1 )/(n/j)
  • Step 44 Calculate the voltage drop corresponding to the impedance of each stage in each segment according to the voltage drop of each segment and the linear proportional coefficient K i of the impedance series, and set ((i-1)n/j) ⁇ m ⁇ i( n/j), the voltage drop ⁇ OVDD m corresponding to the mth impedance in the i-th segment is:
  • ⁇ OVDD m ⁇ OVDD i-1 +K i (m-(i-1)n/j))
  • Step 45 Perform linear compensation of the voltage drop of the sub-regions on the j regions, and adjust the mth sub-pixel in the i-th region of the corresponding AMOLED display panel according to the calculated ⁇ OVDD m corresponding to the m-th impedance in the i-th segment.
  • Data signal variation ⁇ VData m Data signal variation ⁇ VData m :
  • the data signal correction module converts the data signal of the solid color picture from 8 bits to 10 bits using the GAMMA curve.
  • the power supply trace extends in a vertical direction, the AMOLED display panel is divided into j regions in a vertical direction; or the power supply trace extends in a horizontal direction, and the AMOLED display panel is horizontally It is divided into j areas.
  • a system for compensating for a voltage drop of an AMOLED provided by the present invention includes an AMOLED display panel, a picture detection module, and a data signal correction divided into a plurality of regions.
  • the module and the voltage drop compensation module realize the linear compensation of the voltage drop in the sub-area, which can effectively compensate the voltage drop, and solve the problem that the image quality of the AMOLED display panel caused by the voltage drop is not uniform when displayed on a solid color screen.
  • the invention provides a method for compensating the voltage drop of an AMOLED, and divides the AMOLED display panel into a plurality of regions in a direction in which the power supply line extends, and detects a data signal of the image to be displayed through the screen detection module, and determines the pre-display.
  • the picture is a solid color picture
  • the data correction module converting the data signal of the solid color picture to be converted by the data correction module, and then adjusting the data signal variation corresponding to each sub-pixel in each area of the AMOLED display panel by the voltage drop compensation module
  • Multiple regions are used to compensate the voltage drop linearly in the sub-area, which can effectively compensate the voltage drop and solve the problem of uneven image quality of the AMOLED display panel caused by the voltage drop in the solid color display, and the algorithm is simple and easy to implement.
  • FIG. 1 is a schematic structural view of a large-size AMOLED display device
  • FIG. 2 is a circuit diagram of a plurality of AMOLED pixel driving circuits connected in series on a power supply line;
  • FIG. 3 is a circuit diagram of a plurality of AMOLED pixel driving circuits serially connected to a power supply line;
  • FIG. 4 is a structural block diagram of a system for compensating for a voltage drop of an AMOLED according to the present invention
  • FIG. 5 is a schematic diagram of an AMOLED display panel in a system for compensating for a voltage drop of an AMOLED according to the present invention
  • FIG. 6 is a circuit diagram of a plurality of pixel driving circuits sequentially connected in series to a power supply line in a system for compensating an AMOLED voltage drop according to the present invention
  • FIG. 7 is a schematic diagram showing a linear relationship between voltage drop and impedance levels of each segment used by the voltage drop compensation module in the system for compensating AMOLED voltage drop according to the present invention
  • FIG. 8 is a flow chart of a method for compensating for a voltage drop of an AMOLED according to the present invention.
  • the present invention first provides a system for compensating for a voltage drop of an AMOLED, including an AMOLED display panel, a picture detection module, a data signal correction module, and a voltage drop compensation module.
  • the AMOLED display panel includes at least a power supply line L and n sub-pixels serially connected in series to the power supply line, each of the sub-pixels having a pixel driving circuit.
  • the AMOLED display panel is divided into j regions in a direction in which the power supply lines extend, and each region has n/j sub-pixels correspondingly, n and j are positive integers greater than 1, and n ⁇ j.
  • the power supply line L extends in a vertical direction
  • the AMOLED display panel is divided into j areas in a vertical direction; if the power supply line L extends in a horizontal direction
  • the AMOLED display panel is divided into j regions in the horizontal direction. Further, as shown in FIG.
  • the pixel driving circuit includes at least a switching thin film transistor T1, a driving thin film transistor T2, a storage capacitor C, and an organic light emitting diode D.
  • the gate of the switching thin film transistor T1 is electrically connected to the scan signal Gate
  • the source is electrically connected to the data signal Data
  • the drain is electrically connected to the gate of the driving thin film transistor T2 is driven.
  • the drain is electrically connected to the power supply line L, the source is electrically connected to the anode of the organic light emitting diode D; the cathode of the organic light emitting diode D is grounded; one end of the storage capacitor C is electrically connected to the drain of the switching thin film transistor T1, and One end is electrically connected to the drain of the driving thin film transistor T2.
  • the picture detection module is configured to detect a data signal of a picture to be displayed, determine whether the pre-display picture is a solid color picture, and send a data signal to display a solid color picture to the data correction module.
  • the data correction module is configured to receive a data signal for displaying a solid color picture, and convert the data signal of the solid color picture to be displayed. Specifically, the data signal correction module converts the data signal of the solid color picture from 8 bits to 10 bits using the GAMMA curve, so that the data signal has an adjustable space.
  • the voltage drop compensation module is configured to receive a data signal to be displayed by the data correction module to display a solid color picture, and adjust the data signal variation corresponding to each of the n/j sub-pixels in each area of the AMOLED display panel.
  • the area is linearly compensated for the voltage drop in the sub-area.
  • the algorithm for linearly compensating the voltage drop of the sub-regions of the j regions by the voltage drop compensation module is:
  • the impedance of the power supply line L corresponds to n sub-pixels serially connected in series to the power supply line, which is equivalent to n stages;
  • the n-level impedance corresponding to the j-region of the AMOLED display panel is divided into j segments, wherein the first segment is closest to the standard power supply voltage OVDD, and the j-th terminal is farthest from the standard power supply voltage OVDD;
  • K i ( ⁇ OVDD i - ⁇ OVDD i-1 )/(n/j)
  • the voltage drop corresponding to each level of impedance in each segment is calculated, and ((i-1)n/j) ⁇ m ⁇ i(n/ j), the voltage drop ⁇ OVDD m corresponding to the mth impedance in the i-th segment is:
  • ⁇ OVDD m ⁇ OVDD i-1 +K i (m-(i-1)n/j))
  • the voltage drop of the sub-region is linearly compensated for the j regions, and the data signal of the mth sub-pixel in the i-th region of the corresponding AMOLED display panel is adjusted according to the calculated ⁇ OVDD m corresponding to the mth-order impedance in the i-th segment.
  • the amount of change ⁇ VData m is the amount of change ⁇ VData m :
  • the AMOLED voltage drop system further includes a Frame Rate Control (FRC) module or a Dithering display module.
  • FRC Frame Rate Control
  • the AMOLED voltage drop system of the present invention can effectively compensate for IR Drop, and solves the problem that the AMOLED display panel caused by IR Drop is uneven in image quality when displayed on a solid color screen.
  • the present invention further provides a method for compensating for a voltage drop of an AMOLED, including the following steps:
  • Step 1 Provide a system to compensate for the AMOLED voltage drop.
  • the system for compensating the voltage drop of the AMOLED includes an AMOLED display panel, a picture detection module, a data signal correction module, and a voltage drop compensation module.
  • the AMOLED display panel includes at least a power supply line L and n sub-pixels serially connected in series on the power supply line, each sub-pixel has a pixel driving circuit; and the AMOLED display panel extends in a direction in which the power supply line extends.
  • the upper portion is divided into j regions, each region having n/j sub-pixels correspondingly, n and j are positive integers greater than 1, and n ⁇ j.
  • the AMOLED display panel is divided into j areas in a vertical direction; if the power supply line L extends in a horizontal direction, the AMOLED display panel It is divided into j areas in the horizontal direction.
  • the pixel driving circuit includes at least a switching thin film transistor T1, a driving thin film transistor T2, a storage capacitor C, and an organic light emitting diode D.
  • the gate of the switching thin film transistor T1 is electrically connected to the scan signal Gate
  • the source is electrically connected to the data signal Data
  • the drain is electrically connected to the gate of the driving thin film transistor T2 is driven.
  • the drain is electrically connected to the power supply line L, and the source is electrically connected to the anode of the organic light emitting diode D; the organic light emitting diode The cathode of the pole D is grounded; one end of the storage capacitor C is electrically connected to the drain of the switching thin film transistor T1, and the other end is electrically connected to the drain of the driving thin film transistor T2.
  • the system for compensating the voltage drop of the AMOLED may further include a frame rate control module or a jitter display module according to actual display requirements.
  • Step 2 The picture detection module detects a data signal of the picture to be displayed, determines whether the pre-display picture is a solid color picture, and if so, sends the data signal of the solid color picture to the data correction module, and then performs subsequent steps. 3.
  • Step 3 The data correction module receives a data signal for displaying a solid color picture, and converts a data signal for displaying a solid color picture.
  • the data signal correction module converts the data signal of the solid color picture from 8 bits to 10 bits by using the GAMMA curve, so that the data signal has an adjustable space.
  • Step 4 the voltage drop compensation module receives the data signal of the solid color picture converted by the data correction module, and adjusts the data signal change amount corresponding to each of the n/j sub-pixels in each area of the AMOLED display panel.
  • the j regions do the linear compensation of the voltage drop in the sub-region.
  • the step 4 includes:
  • Step 41 The impedance of the power supply line L corresponds to n sub-pixels sequentially connected in series to the power supply line, and is equivalent to n stages;
  • Step 42 dividing the n-level impedance corresponding to the j-region of the AMOLED display panel into j segments, wherein the first segment is closest to the standard power supply voltage OVDD, and the j-th terminal is farthest from the standard power supply voltage OVDD;
  • K i ( ⁇ OVDD i - ⁇ OVDD i-1 )/(n/j)
  • Step 44 Calculate the voltage drop corresponding to the impedance of each stage in each segment according to the voltage drop of each segment and the linear proportional coefficient K i of the impedance series, and set ((i-1)n/j) ⁇ m ⁇ i( n/j), the voltage drop ⁇ OVDD m corresponding to the mth impedance in the i-th segment is:
  • ⁇ OVDD m ⁇ OVDD i-1 +K i (m-(i-1)n/j))
  • Step 45 Perform linear compensation of the voltage drop of the sub-regions on the j regions, and adjust the mth sub-pixel in the i-th region of the corresponding AMOLED display panel according to the calculated ⁇ OVDD m corresponding to the m-th impedance in the i-th segment.
  • Data signal variation ⁇ VData m Data signal variation ⁇ VData m :
  • the method for compensating the voltage drop of the AMOLED further includes the step 5: performing frame rate control or jitter display by using a frame rate control module or a jitter display module according to the width of the data signal provided by the source driver (Source IC), further improving The display quality of the solid color screen.
  • the area of the AMOLED display panel is divided, the more accurate the compensation for the voltage drop, and the area of the AMOLED display panel can be determined according to the actual voltage drop. number.
  • the method for compensating the voltage drop of the AMOLED of the invention can effectively compensate the IR Drop, and solves the problem that the image quality of the AMOLED display panel caused by the IR drop is not uniform when the solid color screen is displayed, and the algorithm is simple and easy to implement.
  • the system for compensating the voltage drop of the AMOLED of the present invention comprises an AMOLED display panel, a picture detection module, a data signal correction module, and a voltage drop compensation module divided into a plurality of regions, thereby realizing the voltage drop linearity of the sub-region.
  • the compensation can effectively compensate the voltage drop and solve the problem that the image quality of the AMOLED display panel caused by the voltage drop is uneven when displayed on a solid color screen.
  • the method for compensating the voltage drop of the AMOLED of the present invention divides the AMOLED display panel into a plurality of regions in the direction in which the power supply line extends, and detects the data signal of the image to be displayed through the screen detection module, and determines whether the pre-display screen is a solid color picture, and then converting the data signal of the solid color picture to be converted by the data correction module, and then adjusting the data signal variation corresponding to each sub-pixel in each area of the AMOLED display panel by the voltage drop compensation module to the plurality of areas
  • the voltage drop linear compensation of the sub-area can effectively compensate the voltage drop, solve the problem of uneven image quality of the AMOLED display panel caused by the voltage drop in the solid color display, and the algorithm is simple and easy to implement.

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Abstract

一种补偿AMOLED电压降的系统及方法。补偿AMOLED电压降的系统包括被划分为多个区域的AMOLED显示面板、画面侦测模块、数据信号修正模块及电压降补偿模块。补偿AMOLED电压降的方法，包括：将AMOLED显示面板在电源走线（L）延伸的方向上划分为多个区域，通过画面侦测模块对欲显示画面的数据信号进行侦测，判定预显示画面是否为纯色画面，通过数据信号修正模块对欲显示纯色画面的数据信号进行转换，再通过电压降补偿模块调整对应于AMOLED显示面板每一区域内各个子像素各自的数据信号变化量对多个区域做分区域的电压降线性补偿。补偿AMOLED电压降的系统和方法实现了分区域的电压降线性补偿，有效地补偿了电压降，从而解决了AMOLED显示面板在纯色画面显示时由电压降导致的画质不均匀的问题。

Description

补偿AMOLED电压降的系统及方法 技术领域
本发明涉及显示技术领域，尤其涉及一种补偿AMOLED电压降的系统及方法。
背景技术
有机发光二极管(Organic Light Emitting Display，OLED)显示装置具有自发光、驱动电压低、发光效率高、响应时间短、清晰度与对比度高、近180°视角、使用温度范围宽，可实现柔性显示与大面积全色显示等诸多优点，被业界公认为是最有发展潜力的显示装置。
OLED显示装置按照驱动方式可以分为无源矩阵型OLED(Passive Matrix OLED，PMOLED)和有源矩阵型OLED(Active Matrix OLED，AMOLED)两大类，即直接寻址和薄膜晶体管(Thin Film Transistor，TFT)矩阵寻址两类。其中，AMOLED具有呈阵列式排布的子像素，属于主动显示类型，发光效能高，通常用于高清晰度的大尺寸显示装置。AMOLED中的每个发光单元都由TFT寻址独立控制。发光单元和TFT寻址电路组成的像素结构需要通过电源信号线对其加载直流电源电压(OVDD)进行驱动。
图1所示为一种大尺寸AMOLED显示装置的结构示意图，该AMOLED显示装置包括显示面板1、用于传输电源电压OVDD的电源走线L、X向基板(Xboard)3、柔性电路板(Flexible Printed Circuit,FPC)4。如图2所示，对应于n个子像素的多个像素驱动电路依次串接于一用于传输电源电压OVDD的电源走线L上，n为大于1的正整数，每个素驱动电路均为传统的2T1C结构，包括开关薄膜晶体管T1、驱动薄膜晶体管T2、存储电容C及有机发光二极管D。在理想情况下，对用于传输电源电压OVDD的电源走线L的阻抗忽略不计，电源电压OVDD在传输过程中是没有压降的，所以在显示纯色画面时，流经每个像素驱动电路的电流I是相同的，所有区域的OLED亮度应该一样，具有很好的均匀性。
然而，如图3所示，在实际情况下，用于传输电源电压OVDD的电源走线L不可避免的存在阻抗，电源电压OVDD会在电源走线L上产生电压降(IR Drop)，且随着AMOLED显示面板的尺寸越大，分辨率越高，电源走线L的长度越长，阻抗就越大。结合图1，在靠近FPC端4即靠近电源供电位置区域的电源电压相比离电源供电位置较远区域的电源电压要高。
设电源走线L对应与第i个像素驱动电路的阻抗为Ri，i＝1、2、3、….n，流经第i个像素驱动电路的电流为Ii，则第i个子像素对应的电源电压值OVDDi可由下式计算：
Figure PCTCN2015083068-appb-000001
按照电流的流向，电流越到后端，电源走线L上的阻抗分压越多，最终导致施加在OLED上的电源电压OVDDi按照n个子像素的排列顺序逐渐减小。若显示纯色画面，由于电源电压OVDDi与流经第i个像素驱动电路的电流Ii相关，不同的像素有不同的电流输出，造成显示面板不同区域的亮度会不一样，画面的均匀性差，影响显示画质。
发明内容
本发明的目的在于提供一种补偿AMOLED电压降的系统，能够有效补偿电压降，解决由电压降导致的AMOLED显示面板在纯色画面显示时画质不均匀的问题。
本发明的目的还在于提供一种补偿AMOLED电压降的方法，能够有效补偿电压降，解决由电压降导致的AMOLED显示面板在纯色画面显示时画质不均匀的问题，且算法简单，易实现。
为实现上述目的，本发明提供一种补偿AMOLED电压降的系统，包括AMOLED显示面板、画面侦测模块、数据信号修正模块、及电压降补偿模块；
所述AMOLED显示面板至少包括电源走线、及依次串接于所述电源走线上的n个子像素，每一子像素具有一像素驱动电路；所述AMOLED显示面板在电源走线延伸的方向上被划分为j个区域，每一区域相应具有n/j个子像素，n、j均为大于1的正整数，且n≥j；
所述画面侦测模块用于对欲显示画面的数据信号进行侦测，判定预显示画面是否为纯色画面，并将欲显示纯色画面的数据信号发送至数据修正模块；
所述数据修正模块用于接收欲显示纯色画面的数据信号，对欲显示纯色画面的数据信号进行转换；
所述电压降补偿模块用于接收经数据修正模块转换后的欲显示纯色画面的数据信号，通过调整对应于AMOLED显示面板每一区域内n/j个子像素各自的数据信号变化量对所述j个区域做分区域的电压降线性补偿。
所述电压降补偿模块对所述j个区域做分区域的电压降线性补偿的算 法为：
首先将电源走线的阻抗对应于依次串接于该电源走线上的n个子像素等效为n级；
再将n级阻抗对应于AMOLED显示面板的j个区域划分成j段，其中第1段最靠近标准电源电压，第j端最远离标准电源电压；
在以阻抗级数为横轴、以电压降为纵轴的坐标系内，绘制出与每一段分界处及其电压降ΔOVDDi相应的节点，i＝1、2、……j，连接相邻的两个节点，获得每一段的电压降与阻抗级数的线性比例系数Ki：
Ki＝(ΔOVDDi-ΔOVDDi-1)/(n/j)
然后根据每一段的电压降与阻抗级数的线性比例系数Ki分段计算各段内每一级阻抗对应的电压降，设((i-1)n/j)＜m＜i(n/j)，第i段中第m级阻抗对应的电压降ΔOVDDm为：
ΔOVDDm＝ΔOVDDi-1+Ki(m-(i-1)n/j))
最后对所述j个区域做分区域的电压降线性补偿，根据计算得到的第i段中第m级阻抗对应的ΔOVDDm调整相应的AMOLED显示面板中第i区域中第m个子像素的数据信号变化量ΔVDatam：
ΔVDatam＝ΔOVDDm。
所述补偿AMOLED电压降的系统，还包括帧速控制模块或抖动显示模块。
所述数据信号修正模块使用GAMMA曲线将欲显示纯色画面的数据信号由8bit转换为10bit。
所述电源走线沿竖直方向延伸，所述AMOLED显示面板在竖直方向上被划分为j个区域；或所述电源走线沿水平方向延伸，所述AMOLED显示面板在水平方向上被划分为j个区域。
本发明还提供一种补偿AMOLED电压降的系统，包括AMOLED显示面板、画面侦测模块、数据信号修正模块、及电压降补偿模块；
所述AMOLED显示面板至少包括电源走线、及依次串接于所述电源走线上的n个子像素，每一子像素具有一像素驱动电路；所述AMOLED显示面板在电源走线延伸的方向上被划分为j个区域，每一区域相应具有n/j个子像素，n、j均为大于1的正整数，且n≥j；
所述画面侦测模块用于对欲显示画面的数据信号进行侦测，判定预显示画面是否为纯色画面，并将欲显示纯色画面的数据信号发送至数据修正模块；
所述数据修正模块用于接收欲显示纯色画面的数据信号，对欲显示纯 色画面的数据信号进行转换；
所述电压降补偿模块用于接收经数据修正模块转换后的欲显示纯色画面的数据信号，通过调整对应于AMOLED显示面板每一区域内n/j个子像素各自的数据信号变化量对所述j个区域做分区域的电压降线性补偿；
其中，所述电压降补偿模块对所述j个区域做分区域的电压降线性补偿的算法为：
首先将电源走线的阻抗对应于依次串接于该电源走线上的n个子像素等效为n级；
再将n级阻抗对应于AMOLED显示面板的j个区域划分成j段，其中第1段最靠近标准电源电压，第j端最远离标准电源电压；
在以阻抗级数为横轴、以电压降为纵轴的坐标系内，绘制出与每一段分界处及其电压降ΔOVDDi相应的节点，i＝1、2、……j，连接相邻的两个节点，获得每一段的电压降与阻抗级数的线性比例系数Ki：
Ki＝(ΔOVDDi-ΔOVDDi-1)/(n/j)
然后根据每一段的电压降与阻抗级数的线性比例系数Ki分段计算各段内每一级阻抗对应的电压降，设((i-1)n/j)＜m＜i(n/j)，第i段中第m级阻抗对应的电压降ΔOVDDm为：
ΔOVDDm＝ΔOVDDi-1+Ki(m-(i-1)n/j))
最后对所述j个区域做分区域的电压降线性补偿，根据计算得到的第i段中第m级阻抗对应的ΔOVDDm调整相应的AMOLED显示面板中第i区域中第m个子像素的数据信号变化量ΔVDatam：
ΔVDatam＝ΔOVDDm；
还包括帧速控制模块或抖动显示模块；
其中，所述数据信号修正模块使用GAMMA曲线将欲显示纯色画面的数据信号由8bit转换为10bit。
本发明还提供一种补偿AMOLED电压降的方法，包括如下步骤：
步骤1、提供补偿AMOLED电压降的系统；
所述补偿AMOLED电压降的系统包括AMOLED显示面板、画面侦测模块、数据信号修正模块、及电压降补偿模块；
所述AMOLED显示面板至少包括电源走线、及依次串接于所述电源走线上的n个子像素，每一子像素具有一像素驱动电路；所述AMOLED显示面板在电源走线延伸的方向上被划分为j个区域，每一区域相应具有n/j个子像素，n、j均为大于1的正整数，且n≥j；
步骤2、所述画面侦测模块对欲显示画面的数据信号进行侦测，判定预 显示画面是否为纯色画面，若是，则将欲显示纯色画面的数据信号发送至数据修正模块；
步骤3、所述数据修正模块接收欲显示纯色画面的数据信号，对欲显示纯色画面的数据信号进行转换；
步骤4、所述电压降补偿模块接收经数据修正模块转换后的欲显示纯色画面的数据信号，通过调整对应于AMOLED显示面板每一区域内n/j个子像素各自的数据信号变化量对所述j个区域做分区域的电压降线性补偿。
所述补偿AMOLED电压降的系统还包括帧速控制模块或抖动显示模块；所述补偿AMOLED电压降的方法还包括步骤5、通过帧速控制模块或抖动显示模块进行帧速控制或抖动显示，进一步提高纯色画面的显示画质。
所述步骤4具体包括：
步骤41、将电源走线的阻抗对应于依次串接于该电源走线上的n个子像素等效为n级；
步骤42、将n级阻抗对应于AMOLED显示面板的j个区域划分成j段，其中第1段最靠近标准电源电压，第j端最远离标准电源电压；
步骤43、在以阻抗级数为横轴、以电压降为纵轴的坐标系内，绘制出与每一段分界处及其电压降ΔOVDDi相应的节点，i＝1、2、……j，连接相邻的两个节点，获得每一段的电压降与阻抗级数的线性比例系数Ki：
Ki＝(ΔOVDDi-ΔOVDDi-1)/(n/j)
步骤44、根据每一段的电压降与阻抗级数的线性比例系数Ki分段计算各段内每一级阻抗对应的电压降，设((i-1)n/j)＜m＜i(n/j)，第i段中第m级阻抗对应的电压降ΔOVDDm为：
ΔOVDDm＝ΔOVDDi-1+Ki(m-(i-1)n/j))
步骤45、对所述j个区域做分区域的电压降线性补偿，根据计算得到的第i段中第m级阻抗对应的ΔOVDDm调整相应的AMOLED显示面板中第i区域中第m个子像素的数据信号变化量ΔVDatam：
ΔVDatam＝ΔOVDDm。
所述步骤3中，数据信号修正模块使用GAMMA曲线将欲显示纯色画面的数据信号由8bit转换为10bit。
所述步骤1中，电源走线沿竖直方向延伸，所述AMOLED显示面板在竖直方向上被划分为j个区域；或电源走线沿水平方向延伸，所述AMOLED显示面板在水平方向上被划分为j个区域。
本发明的有益效果：本发明提供的一种补偿AMOLED电压降的系统包括被划分为多个区域的AMOLED显示面板、画面侦测模块、数据信号修正 模块、及电压降补偿模块，实现了分区域的电压降线性补偿，能够有效补偿电压降，解决由电压降导致的AMOLED显示面板在纯色画面显示时画质不均匀的问题。本发明提供的一种补偿AMOLED电压降的方法，将AMOLED显示面板在电源走线延伸的方向上划分为多个区域，通过画面侦测模块对欲显示画面的数据信号进行侦测，判定预显示画面是否为纯色画面，然后通过数据修正模块对欲显示纯色画面的数据信号进行转换，再通过电压降补偿模块调整对应于AMOLED显示面板每一区域内各个子像素各自的数据信号变化量对所述多个区域做分区域的电压降线性补偿，能够有效补偿电压降，解决由电压降导致的AMOLED显示面板在纯色画面显示时画质不均匀的问题，且算法简单，易实现。
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其它有益效果显而易见。
附图中，
图1为一种大尺寸AMOLED显示装置的结构示意图；
图2为理想情况下串接于一电源走线上的多个AMOLED像素驱动电路的电路图；
图3为实际情况下串接于一电源走线上的多个AMOLED像素驱动电路的电路图；
图4为本发明补偿AMOLED电压降的系统的结构框图；
图5为本发明补偿AMOLED电压降的系统中AMOLED显示面板的示意图；
图6为本发明补偿AMOLED电压降的系统中依次串接于一电源走线上的多个像素驱动电路的电路图；
图7为本发明补偿AMOLED电压降的系统中电压降补偿模块使用的各段电压降与阻抗级数的线性关系示意图；
图8为本发明补偿AMOLED电压降的方法的流程图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明 的优选实施例及其附图进行详细描述。
请参阅图4至图6，本发明首先提供一种补偿AMOLED电压降的系统，包括AMOLED显示面板、画面侦测模块、数据信号修正模块、及电压降补偿模块。
所述AMOLED显示面板至少包括电源走线L、及依次串接于所述电源走线上的n个子像素，每一子像素具有一像素驱动电路。所述AMOLED显示面板在电源走线延伸的方向上被划分为j个区域，每一区域相应具有n/j个子像素，n、j均为大于1的正整数，且n≥j。具体地，如图5所示，若所述电源走线L沿竖直方向延伸，所述AMOLED显示面板在竖直方向上被划分为j个区域；若所述电源走线L沿水平方向延伸，所述AMOLED显示面板在水平方向上被划分为j个区域。进一步地，如图6所示，所述像素驱动电路至少包括开关薄膜晶体管T1、驱动薄膜晶体管T2、存储电容C、及有机发光二极管D。以2T1C结构为例，开关薄膜晶体管T1的栅极电性连接于扫描信号Gate，源极电性连接于数据信号Data，漏极电性连接于驱动薄膜晶体管T2的栅极；驱动薄膜晶体管T2的漏极电性连接于电源走线L，源极电性连接于有机发光二极管D的阳极；有机发光二极管D的阴极接地；存储电容C的一端电性连接于开关薄膜晶体管T1的漏极，另一端电性连接于驱动薄膜晶体管T2的漏极。
如图4所示，所述画面侦测模块用于对欲显示画面的数据信号进行侦测，判定预显示画面是否为纯色画面，并将欲显示纯色画面的数据信号发送至数据修正模块。
所述数据修正模块用于接收欲显示纯色画面的数据信号，对欲显示纯色画面的数据信号进行转换。具体地，所述数据信号修正模块使用GAMMA曲线将欲显示纯色画面的数据信号由8bit转换为10bit，以使数据信号具有可调节的空间。
所述电压降补偿模块用于接收经数据修正模块转换后的欲显示纯色画面的数据信号，通过调整对应于AMOLED显示面板每一区域内n/j个子像素各自的数据信号变化量对所述j个区域做分区域的电压降线性补偿。结合图7，所述电压降补偿模块对所述j个区域做分区域的电压降线性补偿的算法为：
首先将电源走线L的阻抗对应于依次串接于该电源走线上的n个子像素等效为n级；
再将n级阻抗对应于AMOLED显示面板的j个区域划分成j段，其中第1段最靠近标准电源电压OVDD，第j端最远离标准电源电压OVDD；
在以阻抗级数为横轴、以电压降为纵轴的坐标系内，绘制出与每一段分界处及其电压降ΔOVDDi相应的节点，i＝1、2、……j，连接相邻的两个节点，获得每一段的电压降与阻抗级数的线性比例系数Ki：
Ki＝(ΔOVDDi-ΔOVDDi-1)/(n/j)
然后根据每一段的电压降与阻抗级数的线性比例系数Ki分段计算各段内每一级阻抗对应的电压降，设((i-1)n/j)＜m＜i(n/j)，第i段中第m级阻抗对应的电压降ΔOVDDm为：
ΔOVDDm＝ΔOVDDi-1+Ki(m-(i-1)n/j))
最后对所述j个区域做分区域的电压降线性补偿，根据计算得到的第i段中第m级阻抗对应的ΔOVDDm调整相应的AMOLED显示面板中第i区域中第m个子像素的数据信号变化量ΔVDatam：
ΔVDatam＝ΔOVDDm。
为了进一步提高纯色画面的显示画质，所述AMOLED电压降的系统还包括帧速控制(Frame Rate Control，FRC)模块或抖动(Dithering)显示模块。
本发明的AMOLED电压降的系统，能够有效补偿IR Drop，解决由IR Drop导致的AMOLED显示面板在纯色画面显示时画质不均匀的问题。
请参阅图8，结合图4至图7，本发明还提供一种补偿AMOLED电压降的方法，包括如下步骤：
步骤1、提供补偿AMOLED电压降的系统。
如图4至图6所示，所述补偿AMOLED电压降的系统包括AMOLED显示面板、画面侦测模块、数据信号修正模块、及电压降补偿模块。
所述AMOLED显示面板至少包括电源走线L、及依次串接于所述电源走线上的n个子像素，每一子像素具有一像素驱动电路；所述AMOLED显示面板在电源走线延伸的方向上被划分为j个区域，每一区域相应具有n/j个子像素，n、j均为大于1的正整数，且n≥j。
具体地，若所述电源走线L沿竖直方向延伸，所述AMOLED显示面板在竖直方向上被划分为j个区域；若所述电源走线L沿水平方向延伸，所述AMOLED显示面板在水平方向上被划分为j个区域。
所述像素驱动电路至少包括开关薄膜晶体管T1、驱动薄膜晶体管T2、存储电容C、及有机发光二极管D。以2T1C结构为例，开关薄膜晶体管T1的栅极电性连接于扫描信号Gate，源极电性连接于数据信号Data，漏极电性连接于驱动薄膜晶体管T2的栅极；驱动薄膜晶体管T2的漏极电性连接于电源走线L，源极电性连接于有机发光二极管D的阳极；有机发光二 极管D的阴极接地；存储电容C的一端电性连接于开关薄膜晶体管T1的漏极，另一端电性连接于驱动薄膜晶体管T2的漏极。
根据实际显示的需要，所述补偿AMOLED电压降的系统还可以包括帧速控制模块或抖动显示模块。
步骤2、所述画面侦测模块对欲显示画面的数据信号进行侦测，判定预显示画面是否为纯色画面，若是，则将欲显示纯色画面的数据信号发送至数据修正模块，接着进行后续步骤3。
步骤3、所述数据修正模块接收欲显示纯色画面的数据信号，对欲显示纯色画面的数据信号进行转换。
具体地，该步骤3中，数据信号修正模块使用GAMMA曲线将欲显示纯色画面的数据信号由8bit转换为10bit，以使数据信号具有可调节的空间。
步骤4、所述电压降补偿模块接收经数据修正模块转换后的欲显示纯色画面的数据信号，通过调整对应于AMOLED显示面板每一区域内n/j个子像素各自的数据信号变化量对所述j个区域做分区域的电压降线性补偿。
具体地，该步骤4包括：
步骤41、将电源走线L的阻抗对应于依次串接于该电源走线上的n个子像素等效为n级；
步骤42、将n级阻抗对应于AMOLED显示面板的j个区域划分成j段，其中第1段最靠近标准电源电压OVDD，第j端最远离标准电源电压OVDD；
步骤43、在以阻抗级数为横轴、以电压降为纵轴的坐标系内，绘制出与每一段分界处及其电压降ΔOVDDi相应的节点，i＝1、2、……j，连接相邻的两个节点，获得每一段的电压降与阻抗级数的线性比例系数Ki：
Ki＝(ΔOVDDi-ΔOVDDi-1)/(n/j)
步骤44、根据每一段的电压降与阻抗级数的线性比例系数Ki分段计算各段内每一级阻抗对应的电压降，设((i-1)n/j)＜m＜i(n/j)，第i段中第m级阻抗对应的电压降ΔOVDDm为：
ΔOVDDm＝ΔOVDDi-1+Ki(m-(i-1)n/j))
步骤45、对所述j个区域做分区域的电压降线性补偿，根据计算得到的第i段中第m级阻抗对应的ΔOVDDm调整相应的AMOLED显示面板中第i区域中第m个子像素的数据信号变化量ΔVDatam：
ΔVDatam＝ΔOVDDm。
进一步地，所述补偿AMOLED电压降的方法还包括步骤5、根据源极驱动器(Source IC)提供的数据信号的宽度，通过帧速控制模块或抖动显示模块进行帧速控制或抖动显示，进一步提高纯色画面的显示画质。
值得一提的是，在所述步骤1中，所述AMOLED显示面板被划分的区域越多，对电压降的补偿就越精确，可根据实际电压降的大小来确定对AMOLED显示面板划分区域的数目。
本发明的补偿AMOLED电压降的方法，能够有效补偿IR Drop，解决由IR Drop导致的AMOLED显示面板在纯色画面显示时画质不均匀的问题，且算法简单，易实现。
综上所述，本发明的补偿AMOLED电压降的系统包括被划分为多个区域的AMOLED显示面板、画面侦测模块、数据信号修正模块、及电压降补偿模块，实现了分区域的电压降线性补偿，能够有效补偿电压降，解决由电压降导致的AMOLED显示面板在纯色画面显示时画质不均匀的问题。本发明的补偿AMOLED电压降的方法，将AMOLED显示面板在电源走线延伸的方向上划分为多个区域，通过画面侦测模块对欲显示画面的数据信号进行侦测，判定预显示画面是否为纯色画面，然后通过数据修正模块对欲显示纯色画面的数据信号进行转换，再通过电压降补偿模块调整对应于AMOLED显示面板每一区域内各个子像素各自的数据信号变化量对所述多个区域做分区域的电压降线性补偿，能够有效补偿电压降，解决由电压降导致的AMOLED显示面板在纯色画面显示时画质不均匀的问题，且算法简单，易实现。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (12)

  1. 一种补偿AMOLED电压降的系统，包括AMOLED显示面板、画面侦测模块、数据信号修正模块、及电压降补偿模块；
    所述AMOLED显示面板至少包括电源走线、及依次串接于所述电源走线上的n个子像素，每一子像素具有一像素驱动电路；所述AMOLED显示面板在电源走线延伸的方向上被划分为j个区域，每一区域相应具有n/j个子像素，n、j均为大于1的正整数，且n≥j；
    所述画面侦测模块用于对欲显示画面的数据信号进行侦测，判定预显示画面是否为纯色画面，并将欲显示纯色画面的数据信号发送至数据修正模块；
    所述数据修正模块用于接收欲显示纯色画面的数据信号，对欲显示纯色画面的数据信号进行转换；
    所述电压降补偿模块用于接收经数据修正模块转换后的欲显示纯色画面的数据信号，通过调整对应于AMOLED显示面板每一区域内n/j个子像素各自的数据信号变化量对所述j个区域做分区域的电压降线性补偿。
  2. 如权利要求1所述的补偿AMOLED电压降的系统，其中，所述电压降补偿模块对所述j个区域做分区域的电压降线性补偿的算法为：
    首先将电源走线的阻抗对应于依次串接于该电源走线上的n个子像素等效为n级；
    再将n级阻抗对应于AMOLED显示面板的j个区域划分成j段，其中第1段最靠近标准电源电压，第j端最远离标准电源电压；
    在以阻抗级数为横轴、以电压降为纵轴的坐标系内，绘制出与每一段分界处及其电压降ΔOVDDi相应的节点，i＝1、2、……j，连接相邻的两个节点，获得每一段的电压降与阻抗级数的线性比例系数Ki：
    Ki＝(ΔOVDDi-ΔOVDDi-1)/(n/j)
    然后根据每一段的电压降与阻抗级数的线性比例系数Ki分段计算各段内每一级阻抗对应的电压降，设((i-1)n/j)＜m＜i(n/j)，第i段中第m级阻抗对应的电压降ΔOVDDm为：
    ΔOVDDm＝ΔOVDDi-1+Ki(m-(i-1)n/j))
    最后对所述j个区域做分区域的电压降线性补偿，根据计算得到的第i段中第m级阻抗对应的ΔOVDDm调整相应的AMOLED显示面板中第i区域中第m个子像素的数据信号变化量ΔVDatam：
    ΔVDatam＝ΔOVDDm。
  3. 如权利要求1所述的补偿AMOLED电压降的系统，还包括帧速控制模块或抖动显示模块。
  4. 如权利要求1所述的补偿AMOLED电压降的系统，其中，所述数据信号修正模块使用GAMMA曲线将欲显示纯色画面的数据信号由8bit转换为10bit。
  5. 如权利要求1所述的补偿AMOLED电压降的系统，其中，所述电源走线沿竖直方向延伸，所述AMOLED显示面板在竖直方向上被划分为j个区域；或所述电源走线沿水平方向延伸，所述AMOLED显示面板在水平方向上被划分为j个区域。
  6. 一种补偿AMOLED电压降的系统，包括AMOLED显示面板、画面侦测模块、数据信号修正模块、及电压降补偿模块；
    所述AMOLED显示面板至少包括电源走线、及依次串接于所述电源走线上的n个子像素，每一子像素具有一像素驱动电路；所述AMOLED显示面板在电源走线延伸的方向上被划分为j个区域，每一区域相应具有n/j个子像素，n、j均为大于1的正整数，且n≥j；
    所述画面侦测模块用于对欲显示画面的数据信号进行侦测，判定预显示画面是否为纯色画面，并将欲显示纯色画面的数据信号发送至数据修正模块；
    所述数据修正模块用于接收欲显示纯色画面的数据信号，对欲显示纯色画面的数据信号进行转换；
    所述电压降补偿模块用于接收经数据修正模块转换后的欲显示纯色画面的数据信号，通过调整对应于AMOLED显示面板每一区域内n/j个子像素各自的数据信号变化量对所述j个区域做分区域的电压降线性补偿；
    其中，所述电压降补偿模块对所述j个区域做分区域的电压降线性补偿的算法为：
    首先将电源走线的阻抗对应于依次串接于该电源走线上的n个子像素等效为n级；
    再将n级阻抗对应于AMOLED显示面板的j个区域划分成j段，其中第1段最靠近标准电源电压，第j端最远离标准电源电压；
    在以阻抗级数为横轴、以电压降为纵轴的坐标系内，绘制出与每一段分界处及其电压降ΔOVDDi相应的节点，i＝1、2、……j，连接相邻的两个节点，获得每一段的电压降与阻抗级数的线性比例系数Ki：
    Ki＝(ΔOVDDi-ΔOVDDi-1)/(n/j)
    然后根据每一段的电压降与阻抗级数的线性比例系数Ki分段计算各段内每一级阻抗对应的电压降，设((i-1)n/j)＜m＜i(n/j)，第i段中第m级阻抗对应的电压降ΔOVDDm为：
    ΔOVDDm＝ΔOVDDi-1+Ki(m-(i-1)n/j))
    最后对所述j个区域做分区域的电压降线性补偿，根据计算得到的第i段中第m级阻抗对应的ΔOVDDm调整相应的AMOLED显示面板中第i区域中第m个子像素的数据信号变化量ΔVDatam：
    ΔVDatam＝ΔOVDDm；
    还包括帧速控制模块或抖动显示模块；
    其中，所述数据信号修正模块使用GAMMA曲线将欲显示纯色画面的数据信号由8bit转换为10bit。
  7. 如权利要求6所述的补偿AMOLED电压降的系统，其中，所述电源走线沿竖直方向延伸，所述AMOLED显示面板在竖直方向上被划分为j个区域；或所述电源走线沿水平方向延伸，所述AMOLED显示面板在水平方向上被划分为j个区域。
  8. 一种补偿AMOLED电压降的方法，包括如下步骤：
    步骤1、提供补偿AMOLED电压降的系统；
    所述补偿AMOLED电压降的系统包括AMOLED显示面板、画面侦测模块、数据信号修正模块、及电压降补偿模块；
    所述AMOLED显示面板至少包括电源走线、及依次串接于所述电源走线上的n个子像素，每一子像素具有一像素驱动电路；所述AMOLED显示面板在电源走线延伸的方向上被划分为j个区域，每一区域相应具有n/j个子像素，n、j均为大于1的正整数，且n≥j；
    步骤2、所述画面侦测模块对欲显示画面的数据信号进行侦测，判定预显示画面是否为纯色画面，若是，则将欲显示纯色画面的数据信号发送至数据修正模块；
    步骤3、所述数据修正模块接收欲显示纯色画面的数据信号，对欲显示纯色画面的数据信号进行转换；
    步骤4、所述电压降补偿模块接收经数据修正模块转换后的欲显示纯色画面的数据信号，通过调整对应于AMOLED显示面板每一区域内n/j个子像素各自的数据信号变化量对所述j个区域做分区域的电压降线性补偿。
  9. 如权利要求8所述的补偿AMOLED电压降的方法，其中，所述补偿AMOLED电压降的系统还包括帧速控制模块或抖动显示模块；所述补偿AMOLED电压降的方法还包括步骤5、通过帧速控制模块或抖动显示模块 进行帧速控制或抖动显示，进一步提高纯色画面的显示画质。
  10. 如权利要求8所述的补偿AMOLED电压降的方法，其中，所述步骤4具体包括：
    步骤41、将电源走线的阻抗对应于依次串接于该电源走线上的n个子像素等效为n级；
    步骤42、将n级阻抗对应于AMOLED显示面板的j个区域划分成j段，其中第1段最靠近标准电源电压，第j端最远离标准电源电压；
    步骤43、在以阻抗级数为横轴、以电压降为纵轴的坐标系内，绘制出与每一段分界处及其电压降ΔOVDDi相应的节点，i＝1、2、……j，连接相邻的两个节点，获得每一段的电压降与阻抗级数的线性比例系数Ki：
    Ki＝(ΔOVDDi-ΔOVDDi-1)/(n/j)
    步骤44、根据每一段的电压降与阻抗级数的线性比例系数Ki分段计算各段内每一级阻抗对应的电压降，设((i-1)n/j)＜m＜i(n/j)，第i段中第m级阻抗对应的电压降ΔOVDDm为：
    ΔOVDDm＝ΔOVDDi-1+Ki(m-(i-1)n/j))
    步骤45、对所述j个区域做分区域的电压降线性补偿，根据计算得到的第i段中第m级阻抗对应的ΔOVDDm调整相应的AMOLED显示面板中第i区域中第m个子像素的数据信号变化量ΔVDatam：
    ΔVDatam＝ΔOVDDm。
  11. 如权利要求8所述的补偿AMOLED电压降的方法，其中，所述步骤3中，数据信号修正模块使用GAMMA曲线将欲显示纯色画面的数据信号由8bit转换为10bit。
  12. 如权利要求8所述的补偿AMOLED电压降的方法，其中，所述步骤1中，电源走线沿竖直方向延伸，所述AMOLED显示面板在竖直方向上被划分为j个区域；或电源走线沿水平方向延伸，所述AMOLED显示面板在水平方向上被划分为j个区域。
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