WO2018028113A1 - 一种降低amoled显示残影的驱动方法及驱动系统 - Google Patents

一种降低amoled显示残影的驱动方法及驱动系统 Download PDF

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WO2018028113A1
WO2018028113A1 PCT/CN2016/111514 CN2016111514W WO2018028113A1 WO 2018028113 A1 WO2018028113 A1 WO 2018028113A1 CN 2016111514 W CN2016111514 W CN 2016111514W WO 2018028113 A1 WO2018028113 A1 WO 2018028113A1
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pixel
contrast
edge
point
brightness
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French (fr)
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曾玉超
黄泰钧
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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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
    • G09G3/3233—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
    • G09G3/22—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • 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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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
    • G09G2320/10—Special adaptations of display systems for operation with variable images
    • G09G2320/103—Detection of image changes, e.g. determination of an index representative of the image change

Definitions

  • the invention belongs to the field of OLED display, and particularly relates to a driving method and a driving system for reducing residual image of an AMOLED display.
  • OLED display technology is a new display technology that has developed rapidly in recent years.
  • the OLED display technology is mainly based on the self-luminous characteristics of the organic light emitting diode, so that the organic semiconductor material and the luminescent material are driven by the electric field and are displayed by carrier injection and composite luminescence.
  • the driving modes of the OLED display are divided into a passive passive drive (PM OLED) and an active active drive (AMOLED).
  • PM OLED passive passive drive
  • AMOLED active active drive
  • LTPS TFT low temperature polysilicon thin film transistor
  • the next frame display picture after the display screen is switched does not have a high-brightness area.
  • the pixel voltage applied by the pixel having high luminance is high, the aging of the pixel driving transistor is faster than that of other pixels having low luminance, and therefore, the next frame image actually displayed after the display screen is switched is displayed as a residual image.
  • the difference in brightness of the image is obvious, so the difference in the aging of the driving transistor is more obvious, so that the high-contrast display is more likely to leave a residual image.
  • the main method for solving the residual image of AMOLED in the prior art is to multiply the brightness of each pixel in the displayed static picture by a uniform scale factor output, and improve the aging phenomenon of the transistor by reducing the driving voltage, thereby reducing the generation of residual image.
  • the overall brightness of the image is reduced, and its high contrast
  • the difference between the brightness of the pixels in the area and other areas is still relatively large, and the image layering is more obvious, which affects the effect of the OLED display.
  • the present invention proposes a solution to the above problems.
  • One of the technical problems to be solved by the present invention is to provide a method for reducing the residual image of a high contrast static picture and improving its display effect.
  • the embodiment of the present application first provides a driving method for reducing the residual image of the AMOLED display, including detecting whether the picture to be displayed is a static picture; if it is determined to be a static picture, performing the static picture High contrast edge detection; determining edge contrast of each pixel in the static picture based on the result of edge detection; adjusting the output brightness scale coefficient of each pixel according to the edge contrast of each pixel and the position of the pixel itself; corresponding to each pixel
  • the output brightness scale factor outputs the brightness of the pixel.
  • the performing high-contrast edge detection on the static picture comprises: traversing each pixel in the static picture line by line, and comparing the brightness of each pixel with the brightness of the left and right pixels of the pixel. Marking the horizontal start point and end point of the high contrast edge, and determining the contrast between the horizontal start point and the end point; traversing each pixel in the static picture column by column, and the brightness of each pixel is up and down of the pixel The brightness of the pixels is compared, marking the longitudinal starting and ending points of the high contrast edge and determining the contrast of the longitudinal starting and ending points.
  • the lateral starting point and the ending point of the marked high contrast edge comprise traversing each pixel in a row from left to right, and the ratio of the brightness of the pixel to the first pixel located on the left side thereof is greater than the set edge contrast.
  • the pixel is marked as the lateral starting point of the high contrast edge; when the ratio of the brightness of the pixel to the second pixel located to the right of the pixel is greater than the set edge contrast threshold, the pixel is marked as the horizontal end of the high contrast edge point.
  • the edge detection based result determines an edge contrast of each pixel in the still picture, including determining a left edge contrast and a right edge contrast of each pixel, so as to be located in a row where the pixel is located closest to the left side of the pixel
  • the left edge contrast of the start or end point is taken as the left edge contrast of the pixel
  • the right edge contrast of the horizontal start point or end point closest to the right side of the pixel at the line of the pixel is taken as the right edge contrast of the pixel.
  • the longitudinal starting point and the ending point of the mark high-contrast edge comprise traversing each pixel in a column from top to bottom, and the ratio of the brightness of the pixel to the third pixel located above it is greater than the set value.
  • the edge contrast threshold is marked as a longitudinal starting point of the high contrast edge; when the ratio of the brightness of the pixel to the fourth pixel located below it is greater than the set edge contrast threshold, the pixel is marked as a high contrast edge Longitudinal end point.
  • the edge detection based result determines an edge contrast of each pixel in the still picture, including determining an upper edge contrast and a lower edge contrast of each pixel, so as to be located in a column in which the pixel is located closest to the upper side of the pixel
  • the upper edge contrast of the starting point or the ending point is taken as the upper edge contrast of the pixel
  • the lower edge contrast of the vertical starting point or ending point closest to the lower side of the pixel in the column of the pixel is taken as the lower edge contrast of the pixel.
  • the adjusting the output luminance scaling factor of each pixel according to the edge contrast of each pixel and the position of the pixel itself comprises: determining the relative position of each pixel edge and the edge of each pixel and the edge contrast of each pixel a horizontal contrast correlation degree of the pixel and a vertical contrast correlation; determining a horizontal brightness reduction coefficient and a vertical brightness reduction coefficient of the pixel according to the horizontal contrast correlation and the vertical contrast correlation; based on the horizontal brightness reduction coefficient and the vertical brightness reduction coefficient And the static time at which the static picture is located determines the output luminance scale factor of the pixel.
  • the horizontal contrast correlation and the vertical contrast correlation of the pixels are determined according to the following expression:
  • CH and CV respectively represent the horizontal contrast correlation and the vertical contrast correlation of the pixel;
  • (x 1 , y) is the position coordinate of the lateral starting point or the ending point located on the left side of the pixel, and
  • (x 2 , y) is located at the pixel.
  • the position coordinate of the horizontal start point or end point on the right side, (x, y 1 ) is the position coordinate of the longitudinal start point or end point on the upper side of the pixel, and (x, y 2 ) is the longitudinal start point on the lower side of the pixel.
  • CL, CR, CU, CD are the left edge contrast, the right edge contrast, the upper edge contrast and the lower edge contrast of the pixel, respectively.
  • the output luminance scale factor k of the pixel is determined according to the following expression:
  • kH and kV are the lateral luminance reduction coefficient and the vertical luminance reduction coefficient of the pixel, respectively
  • kth 1 and kth 2 are the minimum lateral luminance reduction coefficient threshold and the minimum longitudinal luminance reduction coefficient threshold, respectively
  • j(t) is the luminance varying with time. Control function.
  • the embodiment of the present application further provides a driving system for reducing the residual image of the AMOLED display, comprising: a static picture detecting module, which detects whether the picture to be displayed is a static picture; and an edge detecting module, where the determining is a static picture, And performing high-contrast edge detection on the static image; the edge contrast determining module determines an edge contrast of each pixel in the static image based on a result of edge detection; and a coefficient adjustment module according to edge contrast of each pixel and The position of the pixel itself adjusts the output brightness scale factor of each pixel; and the processing output module outputs the brightness of the pixel with the output brightness scale factor corresponding to each pixel.
  • a static picture detecting module which detects whether the picture to be displayed is a static picture
  • an edge detecting module where the determining is a static picture, And performing high-contrast edge detection on the static image
  • the edge contrast determining module determines an edge contrast of each pixel in the static image based on a result of edge detection
  • FIG. 1 is a schematic diagram showing generation of an afterimage of an AMOLED in the prior art
  • FIG. 2 is a schematic flow chart of a driving method for reducing an afterimage of an AMOLED display according to an embodiment of the invention
  • FIG. 3 is a schematic diagram of marking edge points in a still picture to be displayed
  • 4a-4h are schematic diagrams for determining edge contrast of an arbitrary pixel point according to edge points
  • FIG. 5 is a schematic diagram of a relative position between an edge point and a pixel when the output luminance scale factor is adjusted
  • FIG. 6 is a schematic diagram showing the structure of a driving system for reducing the residual image of an AMOLED display according to an embodiment of the invention. Figure.
  • FIG. 2 is a schematic flow chart of a driving method for reducing an afterimage of an AMOLED display according to an embodiment of the present invention. As shown in the figure, the driving method includes the following steps:
  • Step S210 Detect whether the picture to be displayed is a static picture.
  • Step S220 If it is determined to be a static picture, perform high-contrast edge detection on the still picture.
  • Step S230 Determine an edge contrast of each pixel in the still picture based on the result of the edge detection.
  • Step S240 adjusting the output luminance scale coefficient of each pixel according to the edge contrast of each pixel and the position of the pixel itself.
  • step S250 the brightness of the pixel is outputted with the output brightness proportional coefficient corresponding to each pixel.
  • step S210 it is first determined by the detection whether the picture to be displayed is a static picture, and if it is not a static picture, no brightness adjustment is needed. Only when it is determined that the screen is a static screen, step S220 is continued.
  • step S220 high-contrast edge detection is performed on the still picture to be displayed to acquire information of the high-contrast area therein.
  • high-contrast edge detection of a static picture is performed based on the following method, including traversing each pixel in the static picture line by line, and the brightness of each pixel and the brightness of the left and right pixels of the pixel In comparison, the lateral starting point and the lateral ending point of the high contrast edge are marked, and the contrast of the lateral starting point and the lateral ending point is determined. Traversing each pixel in the static picture column by column, comparing the brightness of each pixel with the brightness of the upper and lower pixels of the pixel, marking the longitudinal starting point and the longitudinal ending point of the high contrast edge, and determining the vertical starting point and the vertical direction The contrast of the end point.
  • each row of pixels of the still picture is traversed from top to bottom, and for each line of pixels, each pixel in a row is sequentially traversed from left to right.
  • the pixel is marked as the lateral starting point of the high contrast edge.
  • the pixel is marked as a high contrast edge Horizontal end point.
  • each column of pixels of the static picture is traversed from left to right, and for each column of pixels, each pixel in one column is traversed in order from top to bottom.
  • the pixel is marked as the longitudinal starting point of the high contrast edge.
  • the pixel is marked as the longitudinal end point of the high contrast edge.
  • edge contrast threshold may be determined according to parameters of the display panel or by panel-based experiments, and unequal edge contrast thresholds may be used when marking the lateral start point end point and the longitudinal start point end point.
  • the P0 point is the pixel point to be inspected at present, and for P0, the pixel points PL and PR located in the same row, and the pixel points PU and PD located in the same column are respectively examined.
  • the luminance of the pixel P0 is denoted as Y0
  • the luminances of the pixel points PL, PR, PU, and PD are YL, YR, YU, and YD, respectively, for determining the lateral starting point and ending point and for determining the vertical starting point and ending point.
  • the edge contrast thresholds are equal and are denoted as Cth.
  • the edge contrast corresponding to each of the lateral starting point, the lateral ending point, the longitudinal starting point, and the longitudinal ending point is also marked. As shown in the third column of Table 1.
  • the left edge contrast CL of the lateral starting point is Y0/YL
  • the value of the right edge contrast CR is 1.
  • the value of the left edge contrast CL of the lateral end point is 1, and the value of the right edge contrast CR is Y0/YR.
  • the upper edge contrast CU of the vertical starting point is the value of Y0/YU
  • the lower edge contrast CD The value is 1.
  • the value of the upper edge contrast CU of the longitudinal starting point is 1, and the value of the lower edge contrast CD is Y0/YD.
  • the first pixel of each line can be set as the starting point, and the edge contrast is defined as 1, and the last pixel is the end point, and the edge contrast is defined as 1.
  • step S230 the edge contrast of each pixel in the still picture is determined based on each of the lateral start point, the horizontal end point, the longitudinal start point, and the longitudinal end point of the mark.
  • an edge contrast of each pixel (a point other than a plurality of lateral starting points, lateral ending points, longitudinal starting points, and longitudinal ending points) in a still picture to be displayed is associated with each of the surrounding
  • the edge contrast of the edge points is related.
  • the left edge contrast of the horizontal starting point or the ending point closest to the left side of the pixel in the row of the pixel is taken as the left edge contrast of the pixel.
  • the right edge contrast of the pixel is located at the right edge of the pixel closest to the right side of the pixel on the right side of the pixel.
  • the edge point on the left side of the pixel is a starting point, and the edge point on the right side of the pixel is also a starting point, then the left edge contrast of the starting point on the left side is taken as the left edge contrast of the pixel point, if If the left edge of the starting point on the left has a contrast of CL1, the left edge contrast of the pixel is CL1.
  • the right edge contrast of the starting point on the right side is taken as the right edge contrast of the pixel. According to Table 1, the right edge contrast of the starting point is 1, and the right edge contrast of the pixel is 1. Therefore, the edge contrast of this pixel is recorded as (CL1, 1).
  • the edge point on the left side of the pixel is a starting point
  • the edge point on the right side of the pixel is an end point
  • the left edge contrast of the starting point on the left side is taken as the left edge contrast of the pixel point
  • the left edge contrast of the pixel is CL
  • the right edge contrast of the end point on the right side is taken as the right edge contrast of the pixel point
  • the right edge contrast of the end point on the right side is CR. Therefore, the edge contrast of the pixel is recorded as (CL, CR).
  • the edge point on the left side of the pixel is an end point
  • the edge point on the right side of the pixel is a starting point
  • the left edge contrast of the end point on the left side is taken as the left edge contrast of the pixel point
  • Table 1 shows that the left edge contrast of the end point is 1, then the left edge contrast of the pixel That is 1.
  • the right edge contrast of the starting point on the right side is taken as the right edge contrast of the pixel.
  • the right edge contrast of the starting point is 1, and the right edge contrast of the pixel is 1. Therefore, the edge contrast of this pixel is recorded as (1, 1).
  • the edge point on the left side of the pixel is an end point, and the edge point on the right side of the pixel is also an end point, then the left edge contrast of the end point on the left side is taken as the left edge contrast of the pixel point, according to As can be seen from Table 1, the left edge contrast of the end point is 1, and the left edge contrast of the pixel is 1.
  • the right edge contrast of the end point on the right side is taken as the right edge contrast of the pixel point. If the right edge contrast of the end point on the right side is CR2, the right edge contrast of the pixel point is CR2. Therefore, the edge contrast of this pixel is recorded as (1, CR2).
  • the upper edge contrast and the lower edge contrast of each pixel are determined as the upper edge contrast of the vertical start point or end point of the pixel located closest to the upper side of the pixel as the upper edge contrast of the pixel.
  • the lower edge contrast of the pixel is taken as the lower edge contrast of the vertical starting point or ending point of the pixel located closest to the lower side of the pixel.
  • the upper edge contrast of the vertical starting point or ending point located closest to the upper side of the pixel in the column of the pixel is taken as the upper edge contrast of the pixel.
  • the lower edge contrast of the pixel is taken as the lower edge contrast of the vertical starting point or ending point of the pixel located closest to the lower side of the pixel.
  • the edge point on the upper side of the pixel is a starting point, and the edge point on the lower side of the pixel is also a starting point, then the upper edge contrast of the starting point on the upper side is taken as the upper edge contrast of the pixel point, if The upper edge contrast of the starting point on the upper side is CU1, and the upper edge contrast of the pixel point is CU1.
  • the lower edge contrast of the starting point on the following side is taken as the lower edge contrast of the pixel. According to Table 1, the lower edge contrast of the starting point is 1, and the lower edge contrast of the pixel is 1. Therefore, the edge contrast of this pixel is recorded as (CU1, 1).
  • the edge point on the upper side of the pixel is a starting point
  • the edge point on the lower side of the pixel is an end point
  • the upper edge contrast of the starting point on the upper side is taken as the upper edge contrast of the pixel point
  • the upper edge contrast of the starting point of the upper side is CU
  • the upper edge contrast of the pixel point is CU.
  • the lower edge contrast of the end point on the lower side is the lower edge contrast of the pixel
  • the lower edge contrast of the end point of the lower side is CD
  • the edge contrast of this pixel is recorded as (CU, CD).
  • the edge point on the upper side of the pixel is an end point, and the edge point on the lower side of the pixel Is a starting point, then the upper edge contrast of the ending point on the upper side is taken as the upper edge contrast of the pixel.
  • the upper edge contrast of the ending point is 1, and the upper edge contrast of the pixel is 1 .
  • the lower edge contrast of the starting point on the following side is taken as the lower edge contrast of the pixel.
  • the lower edge contrast of the starting point is 1, and the lower edge contrast of the pixel is 1. Therefore, the edge contrast of this pixel is recorded as (1, 1).
  • the edge point on the upper side of the pixel is an end point, and the edge point on the lower side of the pixel is also an end point, then the upper edge contrast of the end point of the upper side is taken as the upper edge contrast of the pixel point, according to the table. 1 It can be seen that the upper edge contrast of the end point is 1, and the upper edge contrast of the pixel point is 1.
  • the lower edge contrast of the end point on the lower side is the lower edge contrast of the pixel. If the lower edge contrast of the end point of the lower side is CD2, the lower edge contrast of the pixel is CD2. Therefore, the edge contrast of this pixel is recorded as (1, CD2).
  • step S240 the horizontal contrast correlation and the vertical contrast correlation of the pixel are first determined according to the relative position of the pixel itself and the edge points located around it and the edge contrast of each pixel.
  • the horizontal contrast correlation and the vertical contrast correlation of the pixels are determined according to the expression (1) shown below:
  • CH and CV respectively indicate the horizontal contrast correlation and the vertical contrast correlation of the pixel.
  • (x 1 , y) is the position coordinate of the left edge point (lateral start point or end point)
  • (x 2 , y) is the position coordinate of the right edge point (lateral start point or end point).
  • (x, y 1 ) is the position coordinate of the upper edge point (longitudinal start point or end point)
  • (x, y 2 ) is the position coordinate of the lower edge point (longitudinal start point or end point).
  • CL, CR, CU, and CD are the left edge contrast, the right edge contrast, the upper edge contrast, and the lower edge contrast of the pixel, respectively.
  • the horizontal brightness reduction coefficient and the vertical brightness reduction coefficient of the pixel are determined according to the horizontal contrast correlation degree and the vertical contrast correlation degree of the pixel.
  • the lateral luminance reduction coefficient and the vertical luminance reduction coefficient of the pixel are determined according to the expression (2) shown below:
  • Cth is the set edge contrast threshold.
  • the output brightness ratio coefficient of the pixel is determined based on the horizontal brightness reduction coefficient and the vertical brightness reduction coefficient, and the static time at which the still picture is to be displayed.
  • the output luminance scale factor k of the pixel is determined according to the expression (3) shown below:
  • kH and kV are the lateral luminance reduction coefficient and the vertical luminance reduction coefficient of the pixel, respectively
  • kth 1 and kth 2 are the minimum lateral luminance reduction coefficient threshold and the minimum longitudinal luminance reduction coefficient threshold, respectively
  • the brightness reduction coefficient in the embodiment of the present invention is related to the pixel edge point position and the edge contrast of the pixel, and is related to the static picture time. According to the method in the embodiment, the generation of the residual image sticking problem can be more comprehensively considered, and the brightness adjustment can be performed by integrating the space and the time, which can effectively reduce the occurrence of afterimage and improve the image quality of the display.
  • a driving system for reducing image sticking of an AMOLED is also proposed. As shown in FIG. 6, the system includes:
  • the static picture detection module 61 detects whether the picture to be displayed is a static picture.
  • the edge detection module 62 determines that if it is a static picture, performs high-contrast edge detection on the static picture.
  • the edge contrast determination module 63 determines the edge contrast of each pixel in the still picture based on the result of the edge detection.
  • the coefficient adjustment module 64 adjusts the output luminance scale factor of each pixel according to the edge contrast of each pixel and the position of the pixel itself.
  • the processing output module 65 outputs the brightness of the pixel with an output luminance scale factor corresponding to each pixel.
  • the edge detection is performed by displaying the static picture, and the edge point and the edge contrast of each pixel in the static picture are sequentially labeled, and then according to the edge contrast of each pixel and the pixel itself.
  • the position adjustment adjusts the output brightness ratio coefficient of each pixel to drive the pixel, so that the contrast of the high contrast area of the static picture is reduced, and the ratio of the brightness difference of the edge contour of the high contrast area of the image is improved.
  • the method of driving the display of the AMOLED according to the method of the embodiment of the invention can reduce the residual image of the static picture and improve the display effect.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device, which can be centralized on a single computing device or distributed over a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in a storage device by a computing device, or they may be fabricated into individual integrated circuit modules, or many of them Modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

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Abstract

一种降低AMOLED显示残影的驱动方法及驱动系统，该方法包括对静态画面进行高对比度边缘侦测（S220）；基于边缘侦测结果确定各像素的边缘对比度（S230）；根据各像素的边缘对比度以及像素自身的位置调整各像素的输出亮度比例系数（S240）；以各像素对应的输出亮度比例系数输出像素亮度（S250）。该方法能够提高图像高对比区域的边缘轮廓亮暗差异比例。

Description

一种降低AMOLED显示残影的驱动方法及驱动系统
相关申请的交叉引用
本申请要求享有2016年08月10日提交的名称为“一种降低AMOLED显示残影的驱动方法及驱动系统”的中国专利申请CN201610651599.4的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本发明属于OLED显示领域，尤其涉及一种降低AMOLED显示残影的驱动方法及驱动系统。
背景技术
有机发光二极管(Organic Light Emitting Display，OLED)显示技术是近年来快速发展的一种全新的显示技术。OLED显示技术主要是基于有机发光二极管的自发光特性，使有机半导体材料和发光材料在电场驱动下，通过载流子注入和复合发光显示。
OLED显示的驱动方式分为被动式的无源驱动(Passive Matrix，PMOLED)和主动式的有源驱动(Active Matrix，AMOLED)。在AMOLED显示中需要为每个像素配备具有开关功能的低温多晶硅薄膜晶体管(LTPS TFT)来对有机发光二极管施加驱动电压。因此，AMOLED在显示静态高对比图像一段时间后再进行画面切换会出现显示残影的问题。
如图1所示，在静态显示高对比图片中具有一块高亮度区域，显示画面切换后的下一帧显示图片如图中切换显示画面所示，不再具有高亮度区域。而由于亮度高的像素施加的像素电压较高，像素驱动晶体管的老化比其他亮度低的像素快，因此，显示画面切换后实际显示的下一帧图片如显示残影所示。对于高对比度显示画面，由于图像亮暗差异明显，所以驱动晶体管老化差异更加明显，从而高对比度显示画面更容易留下残影。
现有技术中解决AMOLED显示残影的主要方法是将显示的静态画面中的各像素亮度乘以统一的比例系数输出，通过降低驱动电压来改善晶体管的老化现象，减少残影的产生。但对于高对比静态画面，图像整体亮度降低后，其高对比 区域与其他区域像素的亮暗差异仍然比较大，且图像层次化较为明显，影响OLED显示的效果。
本发明针对上述问题提出解决方案。
发明内容
本发明所要解决的技术问题之一是需要提供一种降低高对比静态画面显示残影，改善其显示效果的方法。
为了解决上述技术问题，本申请的实施例首先提供了一种降低AMOLED显示残影的驱动方法，包括侦测待显示的画面是否为静态画面；若判断为静态画面，则对所述静态画面进行高对比度边缘侦测；基于边缘侦测的结果确定所述静态画面中每一个像素的边缘对比度；根据各像素的边缘对比度以及像素自身的位置调整每个像素的输出亮度比例系数；以各像素对应的输出亮度比例系数输出像素的亮度。
优选地，所述对所述静态画面进行高对比度边缘侦测，包括：逐行遍历所述静态画面中的每一个像素，将每一个像素的亮度与该像素的左、右像素的亮度相比较，标记高对比度边缘的横向起始点和结束点，并确定横向起始点和结束点的对比度；逐列遍历所述静态画面中的每一个像素，将每一个像素的亮度与该像素的上、下像素的亮度相比较，标记高对比度边缘的纵向起始点和结束点，并确定纵向起始点和结束点的对比度。
优选地，所述标记高对比度边缘的横向起始点和结束点，包括自左向右依次遍历一行中的各像素，当像素与位于其左边的第一像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的横向起始点；当像素与位于其右边的第二像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的横向结束点。
优选地，所述基于边缘侦测的结果确定所述静态画面中每一个像素的边缘对比度，包括确定各像素的左边缘对比度和右边缘对比度，以位于像素所在行距离该像素左侧最近的横向起始点或结束点的左边缘对比度作为该像素的左边缘对比度；以位于像素所在行距离该像素右侧最近的横向起始点或结束点的右边缘对比度作为该像素的右边缘对比度。
优选地，所述标记高对比度边缘的纵向起始点和结束点，包括自上向下依次遍历一列中的各像素，当像素与位于其上边的第三像素的亮度的比值大于设定的 边缘对比度阈值时，将该像素标记为高对比度边缘的纵向起始点；当像素与位于其下边的第四像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的纵向结束点。
优选地，所述基于边缘侦测的结果确定所述静态画面中每一个像素的边缘对比度，包括确定各像素的上边缘对比度和下边缘对比度，以位于像素所在列距离该像素上侧最近的纵向起始点或结束点的上边缘对比度作为该像素的上边缘对比度；以位于像素所在列距离该像素下侧最近的纵向起始点或结束点的下边缘对比度作为该像素的下边缘对比度。
优选地，所述根据各像素的边缘对比度以及像素自身的位置调整每个像素的输出亮度比例系数，包括：根据像素自身与位于其四周的各边缘点的相对位置及各像素的边缘对比度确定该像素的横向对比相关度与纵向对比相关度；根据所述横向对比相关度与纵向对比相关度确定该像素的横向亮度降低系数与纵向亮度降低系数；基于所述横向亮度降低系数与纵向亮度降低系数，以及所述静态画面所处的静态时间确定该像素的输出亮度比例系数。
优选地，根据以下表达式确定像素的横向对比相关度与纵向对比相关度：
Figure PCTCN2016111514-appb-000001
Figure PCTCN2016111514-appb-000002
其中，CH和CV分别表示像素的横向对比相关度与纵向对比相关度；(x1,y)为位于像素左侧的横向起始点或结束点的位置坐标，(x2,y)为位于像素右侧的横向起始点或结束点的位置坐标，(x,y1)为位于像素上侧的纵向起始点或结束点的位置坐标，(x,y2)为位于像素下侧的纵向起始点或结束点的位置坐标；CL,CR,CU,CD分别为像素点的左边缘对比度，右边缘对比度，上边缘对比度和下边缘对比度。
优选地，根据以下表达式确定像素的输出亮度比例系数k：
Figure PCTCN2016111514-appb-000003
其中，kH和kV分别为像素的横向亮度降低系数与纵向亮度降低系数，kth1和kth2分别为最小横向亮度降低系数阈值和最小纵向亮度降低系数阈值，j(t)为 随时间变化的亮度控制函数。
本申请的实施例还提供了一种降低AMOLED显示残影的驱动系统，包括：静态画面侦测模块，其侦测待显示的画面是否为静态画面；边缘检测模块，其判断若为静态画面，则对所述静态画面进行高对比度边缘侦测；边缘对比度确定模块，其基于边缘侦测的结果确定所述静态画面中每一个像素的边缘对比度；系数调整模块，其根据各像素的边缘对比度以及像素自身的位置调整每个像素的输出亮度比例系数；处理输出模块，其以各像素对应的输出亮度比例系数输出像素的亮度。
与现有技术相比，上述方案中的一个或多个实施例可以具有如下优点或有益效果：
通过对待显示静态画面进行边缘侦测，并依次标记边缘点以及静态画面中每一个像素的边缘对比度，再根据各像素的边缘对比度以及像素自身的位置调整每个像素的输出亮度比例系数对像素进行驱动，使得静态画面高对比区域的对比度得以降低，提高了图像高对比区域的边缘轮廓亮暗差异比例。
本发明的其他优点、目标，和特征在某种程度上将在随后的说明书中进行阐述，并且在某种程度上，基于对下文的考察研究对本领域技术人员而言将是显而易见的，或者可以从本发明的实践中得到教导。本发明的目标和其他优点可以通过下面的说明书，权利要求书，以及附图中所特别指出的结构来实现和获得。
附图说明
附图用来提供对本申请的技术方案或现有技术的进一步理解，并且构成说明书的一部分。其中，表达本申请实施例的附图与本申请的实施例一起用于解释本申请的技术方案，但并不构成对本申请技术方案的限制。
图1为现有技术中AMOLED显示残影的产生示意图；
图2为根据本发明实施例的降低AMOLED显示残影的驱动方法的流程示意图；
图3为对待显示静态画面中的边缘点进行标记的示意图；
图4a-图4h为根据边缘点确定任意像素点的边缘对比度的示意图；
图5为调整输出亮度比例系数时，边缘点与像素之间的相对位置的示意图；
图6为根据本发明实施例的降低AMOLED显示残影的驱动系统的结构示意 图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成相应技术效果的实现过程能充分理解并据以实施。本申请实施例以及实施例中的各个特征，在不相冲突前提下可以相互结合，所形成的技术方案均在本发明的保护范围之内。
图2为根据本发明实施例的降低AMOLED显示残影的驱动方法的流程示意图，如图所示，该驱动方法包括以下步骤：
步骤S210、侦测待显示的画面是否为静态画面。
步骤S220、若判断为静态画面，则对该静态画面进行高对比度边缘侦测。
步骤S230、基于边缘侦测的结果确定静态画面中每一个像素的边缘对比度。
步骤S240、根据各像素的边缘对比度以及像素自身的位置调整每个像素的输出亮度比例系数。
步骤S250、以各像素对应的输出亮度比例系数输出像素的亮度。
具体的，在步骤S210中，先通过侦测判断待显示的画面是否为静态画面，如果不是静态画面，则不需要进行亮度调整。只有判断为静态画面时，才继续执行步骤S220。
在步骤S220中，对待显示的静态画面进行高对比度边缘侦测以获取其中的高对比度区域的信息。
在本发明的一个实施例中，基于以下方法进行静态画面的高对比度边缘侦测，包括逐行遍历静态画面中的每一个像素，将每一个像素的亮度与该像素的左、右像素的亮度相比较，标记高对比度边缘的横向起始点和横向结束点，并确定横向起始点和横向结束点的对比度。逐列遍历静态画面中的每一个像素，将每一个像素的亮度与该像素的上、下像素的亮度相比较，标记高对比度边缘的纵向起始点和纵向结束点，并确定纵向起始点和纵向结束点的对比度。
进一步地，在标记高对比度边缘的横向起始点和横向结束点时，自上向下遍历静态画面的每一行像素，且对于每一行像素，自左向右依次遍历一行中的各像素。当像素与位于其左边的第一像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的横向起始点。当像素与位于其右边的第二像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的 横向结束点。
同理，在标记高对比度边缘的纵向起始点和结束点，自左向右遍历静态画面的每一列像素，且对于每一列像素，自上向下依次遍历一列中的各像素。当像素与位于其上边的第三像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的纵向起始点。当像素与位于其下边的第四像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的纵向结束点。
需要说明的是，边缘对比度阈值可以根据显示面板的参数或通过基于面板的实验来确定，且在标记横向起始点结束点和纵向起始点结束点时可以采用不相等的边缘对比度阈值。
举例而言，如图3所示，P0点为当前待考察的像素点，对于P0，分别考察与其位于同一行的像素点PL和PR，以及与其位于同一列的像素点PU和PD。像素点P0的亮度记为Y0，分别记像素点PL、PR、PU和PD的亮度为YL、YR、YU和YD，用于确定横向起始点和结束点以及用于确定纵向起始点和结束点的边缘对比度阈值相等，记为Cth。
根据上面的比较原则，当Y0/YL＞Cth时，将P0标记为横向起始点，当Y0/YR＞Cth时，将P0标记为横向结束点。当Y0/YU＞Cth时，将P0标记为纵向起始点，当Y0/YD＞Cth时，将P0标记为纵向结束点。如表1中的第一列和第二列所示。
表1边缘点的标记原则与属性统计
条件 边缘点标记 边缘对比度
Y0/YL＞Cth 标记为横向起始点 CL＝Y0/YL，CR＝1
Y0/YR＞Cth 标记为横向结束点 CL＝1，CR＝Y0/YR
Y0/YU＞Cth 标记为纵向起始点 CU＝Y0/YU，CD＝1
Y0/YD＞Cth 标记为纵向结束点 CU＝1，CD＝Y0/YD
在标记静态画面中的横向起始点、横向结束点、纵向起始点和纵向结束点的同时，还要标记与各横向起始点、横向结束点、纵向起始点和纵向结束点相对应的边缘对比度。如表1中的第三列所示。
对于横向起始点和横向结束点，确定其左边缘对比度和右边缘对比度。其中，横向起始点的左边缘对比度CL的数值为Y0/YL，其右边缘对比度CR的数值为1。横向结束点的左边缘对比度CL的数值为1，其右边缘对比度CR的数值为Y0/YR。纵向起始点的上边缘对比度CU的数值为Y0/YU，其下边缘对比度CD 的数值为1。纵向起始点的上边缘对比度CU的数值为1，其下边缘对比度CD的数值为Y0/YD。
需要说明的是，可以设定每条line(横向或纵向)的第一个像素为起始点，规定其边缘对比度为1，最后一个像素为结束点，规定其边缘对比度为1。
经过前面的步骤，可以获得待显示静态画面中的多个具有高对比度边缘属性的横向起始点、横向结束点、纵向起始点和纵向结束点。接下来在步骤S230中，基于标记的各横向起始点、横向结束点、纵向起始点和纵向结束点确定静态画面中每一个像素的边缘对比度。
在本发明的一个实施例中，待显示静态画面中的各像素点(除多个横向起始点、横向结束点、纵向起始点和纵向结束点以外的点)的边缘对比度与位于其四周的各边缘点的边缘对比度有关。
具体的，在确定各像素的左边缘对比度和右边缘对比度时，以位于像素所在行距离该像素左侧最近的横向起始点或结束点的左边缘对比度作为该像素的左边缘对比度。以位于像素所在行距离该像素右侧最近的横向起始点或结束点的右边缘对比度作为该像素的右边缘对比度。这时又可以具体分为四种不同的情况，如图4a-图4d所示。下面结合附图分别说明。
在图4a中，位于像素左侧的边缘点是一个起始点，位于像素右侧的边缘点也是一个起始点，那么以左侧的起始点的左边缘对比度作为该像素点的左边缘对比度，如果记左侧的起始点的左边缘对比度为CL1，则该像素点的左边缘对比度即为CL1。以右侧的起始点的右边缘对比度作为该像素点的右边缘对比度，根据表1可知，起始点的右边缘对比度均为1，则该像素点的右边缘对比度即为1。因此该像素点的边缘对比度记为(CL1,1)。
在图4b中，位于像素左侧的边缘点是一个起始点，位于像素右侧的边缘点是一个结束点，那么以左侧的起始点的左边缘对比度作为该像素点的左边缘对比度，如果记左侧的起始点的左边缘对比度为CL，则该像素点的左边缘对比度即为CL。以右侧的结束点的右边缘对比度作为该像素点的右边缘对比度，如果记右侧的结束点的右边缘对比度为CR，则该像素点的右边缘对比度即为CR。因此该像素点的边缘对比度记为(CL,CR)。
在图4c中，位于像素左侧的边缘点是一个结束点，位于像素右侧的边缘点是一个起始点，那么以左侧的结束点的左边缘对比度作为该像素点的左边缘对比度，根据表1可知，结束点的左边缘对比度均为1，则该像素点的左边缘对比度 即为1。以右侧的起始点的右边缘对比度作为该像素点的右边缘对比度，根据表1可知，起始点的右边缘对比度均为1，则该像素点的右边缘对比度即为1。因此该像素点的边缘对比度记为(1,1)。
在图4d中，位于像素左侧的边缘点是一个结束点，位于像素右侧的边缘点也是一个结束点，那么以左侧的结束点的左边缘对比度作为该像素点的左边缘对比度，根据表1可知，结束点的左边缘对比度均为1，则该像素点的左边缘对比度即为1。以右侧的结束点的右边缘对比度作为该像素点的右边缘对比度，如果记右侧的结束点的右边缘对比度为CR2，则该像素点的右边缘对比度即为CR2。因此该像素点的边缘对比度记为(1,CR2)。
进一步地，还需要确定各像素的上边缘对比度和下边缘对比度，以位于像素所在列距离该像素上侧最近的纵向起始点或结束点的上边缘对比度作为该像素的上边缘对比度。以位于像素所在列距离该像素下侧最近的纵向起始点或结束点的下边缘对比度作为该像素的下边缘对比度。
具体的，在确定各像素的上边缘对比度和下边缘对比度时，以位于像素所在列距离该像素上侧最近的纵向起始点或结束点的上边缘对比度作为该像素的上边缘对比度。以位于像素所在列距离该像素下侧最近的纵向起始点或结束点的下边缘对比度作为该像素的下边缘对比度。这时又可以具体分为四种不同的情况，如图4e-图4h所示。下面结合附图分别说明。
在图4e中，位于像素上侧的边缘点是一个起始点，位于像素下侧的边缘点也是一个起始点，那么以上侧的起始点的上边缘对比度作为该像素点的上边缘对比度，如果记上侧的起始点的上边缘对比度为CU1，则该像素点的上边缘对比度即为CU1。以下侧的起始点的下边缘对比度作为该像素点的下边缘对比度，根据表1可知，起始点的下边缘对比度均为1，则该像素点的下边缘对比度即为1。因此该像素点的边缘对比度记为(CU1,1)。
在图4f中，位于像素上侧的边缘点是一个起始点，位于像素下侧的边缘点是一个结束点，那么以上侧的起始点的上边缘对比度作为该像素点的上边缘对比度，如果记上侧的起始点的上边缘对比度为CU，则该像素点的上边缘对比度即为CU。以下侧的结束点的下边缘对比度作为该像素点的下边缘对比度，如果记下侧的结束点的下边缘对比度为CD，则该像素点的下边缘对比度即为CD。因此该像素点的边缘对比度记为(CU,CD)。
在图4g中，位于像素上侧的边缘点是一个结束点，位于像素下侧的边缘点 是一个起始点，那么以上侧的结束点的上边缘对比度作为该像素点的上边缘对比度，根据表1可知，结束点的上边缘对比度均为1，则该像素点的上边缘对比度即为1。以下侧的起始点的下边缘对比度作为该像素点的下边缘对比度，根据表1可知，起始点的下边缘对比度均为1，则该像素点的下边缘对比度即为1。因此该像素点的边缘对比度记为(1,1)。
在图4h中，位于像素上侧的边缘点是一个结束点，位于像素下侧的边缘点也是一个结束点，那么以上侧的结束点的上边缘对比度作为该像素点的上边缘对比度，根据表1可知，结束点的上边缘对比度均为1，则该像素点的上边缘对比度即为1。以下侧的结束点的下边缘对比度作为该像素点的下边缘对比度，如果记下侧的结束点的下边缘对比度为CD2，则该像素点的下边缘对比度即为CD2。因此该像素点的边缘对比度记为(1,CD2)。
然后在步骤S240中，首先根据像素自身与位于其四周的各边缘点的相对位置及各像素的边缘对比度确定该像素的横向对比相关度与纵向对比相关度。
在本发明的一个实施例中，根据如下所示的表达式(1)确定像素的横向对比相关度与纵向对比相关度：
Figure PCTCN2016111514-appb-000004
式中，如图5所示，CH和CV分别表示像素的横向对比相关度与纵向对比相关度。(x1,y)为左边缘点(横向起始点或结束点)的位置坐标，(x2,y)为右边缘点(横向起始点或结束点)的位置坐标。(x,y1)为上边缘点(纵向起始点或结束点)的位置坐标，(x,y2)为下边缘点(纵向起始点或结束点)的位置坐标。CL,CR,CU,CD分别为像素点的左边缘对比度，右边缘对比度，上边缘对比度和下边缘对比度。
再根据像素的横向对比相关度与纵向对比相关度确定该像素的横向亮度降低系数与纵向亮度降低系数。
在本发明的一个实施例中，根据如下所示的表达式(2)确定像素的横向亮度降低系数与纵向亮度降低系数：
Figure PCTCN2016111514-appb-000005
式中，kH和kV分别表示像素的横向亮度降低系数与纵向亮度降低系数。Cth为设定的边缘对比度阈值。
最后基于横向亮度降低系数与纵向亮度降低系数，以及待显示静态画面所处的静态时间确定该像素的输出亮度比例系数。
在本发明的一个实施例中，根据如下所示的表达式(3)确定像素的输出亮度比例系数k：
Figure PCTCN2016111514-appb-000006
式中，kH和kV分别为像素的横向亮度降低系数与纵向亮度降低系数，kth1和kth2分别为最小横向亮度降低系数阈值和最小纵向亮度降低系数阈值，j(t)为随时间变化的亮度控制函数。举例而言，在一个实施例中，kth1＝kth2＝0.85，
Figure PCTCN2016111514-appb-000007
通过表达式(3)可以看出，本发明实施例中的亮度降低系数与像素对应像素边缘点位置和边缘对比度相关，同时与静态画面时间相关。根据本实施例中的方法，能够更加全面的考虑静态画面残影问题的产生，综合空间与时间进行亮度调整，能够有效地降低残影的发生，并改善显示的画质。
在本发明的另一个实施例中，还提出了一种用于降低AMOLED显示残影的驱动系统，如图6所示，该系统包括：
静态画面侦测模块61，其侦测待显示的画面是否为静态画面。
边缘检测模块62，其判断若为静态画面，则对该静态画面进行高对比度边缘侦测。
边缘对比度确定模块63，其基于边缘侦测的结果确定静态画面中每一个像素的边缘对比度。
系数调整模块64，其根据各像素的边缘对比度以及像素自身的位置调整每个像素的输出亮度比例系数。
处理输出模块65，其以各像素对应的输出亮度比例系数输出像素的亮度。
上述各模块的功能均可参照前一实施例中相对应的方法步骤进行执行，此处不再赘述。
本发明实施例通过对待显示静态画面进行边缘侦测，并依次标记边缘点以及静态画面中每一个像素的边缘对比度，再根据各像素的边缘对比度以及像素自身 的位置调整每个像素的输出亮度比例系数对像素进行驱动，使得静态画面高对比区域的对比度得以降低，提高了图像高对比区域的边缘轮廓亮暗差异比例。
根据本发明实施例的方法对AMOLED进行驱动显示，能够降低静态画面的显示残影，改善显示的效果。
本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
虽然本发明所揭露的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所揭露的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本发明的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (11)

  1. 一种降低AMOLED显示残影的驱动方法，包括：
    侦测待显示的画面是否为静态画面；
    若判断为静态画面，则对所述静态画面进行高对比度边缘侦测；
    基于边缘侦测的结果确定所述静态画面中每一个像素的边缘对比度；
    根据各像素的边缘对比度以及像素自身的位置调整每个像素的输出亮度比例系数；
    以各像素对应的输出亮度比例系数输出像素的亮度。
  2. 根据权利要求1所述的方法，其中，所述对所述静态画面进行高对比度边缘侦测，包括：
    逐行遍历所述静态画面中的每一个像素，将每一个像素的亮度与该像素的左、右像素的亮度相比较，标记高对比度边缘的横向起始点和结束点，并确定横向起始点和结束点的对比度；
    逐列遍历所述静态画面中的每一个像素，将每一个像素的亮度与该像素的上、下像素的亮度相比较，标记高对比度边缘的纵向起始点和结束点，并确定纵向起始点和结束点的对比度。
  3. 根据权利要求2所述的方法，其中，所述标记高对比度边缘的横向起始点和结束点，包括自左向右依次遍历一行中的各像素，
    当像素与位于其左边的第一像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的横向起始点；
    当像素与位于其右边的第二像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的横向结束点。
  4. 根据权利要求3所述的方法，其中，所述基于边缘侦测的结果确定所述静态画面中每一个像素的边缘对比度，包括确定各像素的左边缘对比度和右边缘对比度，
    以位于像素所在行距离该像素左侧最近的横向起始点或结束点的左边缘对比度作为该像素的左边缘对比度；
    以位于像素所在行距离该像素右侧最近的横向起始点或结束点的右边缘对比度作为该像素的右边缘对比度。
  5. 根据权利要求2所述的方法，其中，所述标记高对比度边缘的纵向起始点和结束点，包括自上向下依次遍历一列中的各像素，
    当像素与位于其上边的第三像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的纵向起始点；
    当像素与位于其下边的第四像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的纵向结束点。
  6. 根据权利要求4所述的方法，其中，所述标记高对比度边缘的纵向起始点和结束点，包括自上向下依次遍历一列中的各像素，
    当像素与位于其上边的第三像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的纵向起始点；
    当像素与位于其下边的第四像素的亮度的比值大于设定的边缘对比度阈值时，将该像素标记为高对比度边缘的纵向结束点。
  7. 根据权利要求5所述的方法，其中，所述基于边缘侦测的结果确定所述静态画面中每一个像素的边缘对比度，包括确定各像素的上边缘对比度和下边缘对比度，
    以位于像素所在列距离该像素上侧最近的纵向起始点或结束点的上边缘对比度作为该像素的上边缘对比度；
    以位于像素所在列距离该像素下侧最近的纵向起始点或结束点的下边缘对比度作为该像素的下边缘对比度。
  8. 根据权利要求7所述的方法，其中，所述根据各像素的边缘对比度以及像素自身的位置调整每个像素的输出亮度比例系数，包括：
    根据像素自身与位于其四周的各边缘点的相对位置及各像素的边缘对比度确定该像素的横向对比相关度与纵向对比相关度；
    根据所述横向对比相关度与纵向对比相关度确定该像素的横向亮度降低系数与纵向亮度降低系数；
    基于所述横向亮度降低系数与纵向亮度降低系数，以及所述静态画面所处的静态时间确定该像素的输出亮度比例系数。
  9. 根据权利要求8所述的方法，其中，根据以下表达式确定像素的横向对比相关度与纵向对比相关度：
    Figure PCTCN2016111514-appb-100001
    Figure PCTCN2016111514-appb-100002
    其中，CH和CV分别表示像素的横向对比相关度与纵向对比相关度；(x1,y) 为位于像素左侧的横向起始点或结束点的位置坐标，(x2,y)为位于像素右侧的横向起始点或结束点的位置坐标，(x,y1)为位于像素上侧的纵向起始点或结束点的位置坐标，(x,y2)为位于像素下侧的纵向起始点或结束点的位置坐标；CL,CR,CU,CD分别为像素点的左边缘对比度，右边缘对比度，上边缘对比度和下边缘对比度。
  10. 根据权利要求9所述的方法，其中，根据以下表达式确定像素的输出亮度比例系数k：
    Figure PCTCN2016111514-appb-100003
    其中，kH和kV分别为像素的横向亮度降低系数与纵向亮度降低系数，kth1和kth2分别为最小横向亮度降低系数阈值和最小纵向亮度降低系数阈值，j(t)为随时间变化的亮度控制函数。
  11. 一种降低AMOLED显示残影的驱动系统，包括：
    静态画面侦测模块，其侦测待显示的画面是否为静态画面；
    边缘检测模块，其判断若为静态画面，则对所述静态画面进行高对比度边缘侦测；
    边缘对比度确定模块，其基于边缘侦测的结果确定所述静态画面中每一个像素的边缘对比度；
    系数调整模块，其根据各像素的边缘对比度以及像素自身的位置调整每个像素的输出亮度比例系数；
    处理输出模块，其以各像素对应的输出亮度比例系数输出像素的亮度。
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