WO2017063223A1 - 提升oled显示面板对比度的方法及系统 - Google Patents

提升oled显示面板对比度的方法及系统 Download PDF

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Publication number
WO2017063223A1
WO2017063223A1 PCT/CN2015/092793 CN2015092793W WO2017063223A1 WO 2017063223 A1 WO2017063223 A1 WO 2017063223A1 CN 2015092793 W CN2015092793 W CN 2015092793W WO 2017063223 A1 WO2017063223 A1 WO 2017063223A1
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Prior art keywords
display panel
oled display
new
luminance
component
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PCT/CN2015/092793
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English (en)
French (fr)
Inventor
温亦谦
许神贤
周明忠
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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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Priority to JP2018518614A priority Critical patent/JP6593899B2/ja
Priority to US14/892,203 priority patent/US9812089B2/en
Priority to KR1020187006681A priority patent/KR102001350B1/ko
Priority to GB1805402.3A priority patent/GB2556855B/en
Publication of WO2017063223A1 publication Critical patent/WO2017063223A1/zh
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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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • 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
    • G09G3/03—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes specially adapted for displays having non-planar surfaces, e.g. curved displays
    • G09G3/035—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes specially adapted for displays having non-planar surfaces, e.g. curved displays for flexible display surfaces
    • 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
    • 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
    • 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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • 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
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • 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
    • G09G2340/00—Aspects of display data processing
    • G09G2340/06—Colour space transformation
    • 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 method and system for improving the contrast of an OLED display panel.
  • OLED Organic Light Emitting Display
  • OLED Organic Light Emitting Display
  • OLED display devices can be classified into two types: passive matrix OLED (PMOLED) and active matrix OLED (AMOLED), which are direct addressing and thin film transistor matrix addressing. .
  • the AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a high-definition large-sized display device.
  • the AMOLED is a current driving device.
  • the organic light emitting diode emits light, and the luminance of the light is determined by the current flowing through the light emitting diode itself.
  • the most commonly used AMOLED pixel driving circuit includes two Thin Film Transistors (TFTs) and one Capacitor (Capacitor), that is, a 2T1C pixel driving circuit.
  • the 2T1C pixel driving circuit includes a first thin film transistor T1, a second thin film transistor T2, and a capacitor C.
  • the first thin film transistor T1 is a switching thin film transistor
  • the second thin film transistor T2 is a driving thin film transistor.
  • the capacitor C is a storage capacitor.
  • the gate of the first thin film transistor T1 is electrically connected to the scan signal GN, the source is electrically connected to the data signal SN, and the drain is electrically connected to the gate of the second thin film transistor T2 and one end of the capacitor C;
  • the drain of the second thin film transistor T2 is electrically connected to the high driving voltage OVDD, 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 electrically connected to the low driving voltage OVSS;
  • the drain of the first thin film transistor T1 is electrically connected to the drain of the second thin film transistor T2.
  • the scan signal GN controls the first thin film transistor T1 to be turned on, and the data signal SN enters the gate of the second thin film transistor T2 and the capacitor C through the first thin film transistor T1, and then the first thin film transistor T1 is turned off due to the capacitance C.
  • the gate voltage of the second thin film transistor T2 can continue to maintain the data signal voltage, so that the second thin film transistor T2 is in an on state, and the driving current Ioled enters the organic light emitting through the second thin film transistor T2.
  • the tube D drives the organic light-emitting diode D to emit light.
  • HSI is a color space model established according to the intuitive characteristic of color, the HSI color.
  • the space is derived from the human visual system, and the hue H, the saturation S, and the brightness I are used to describe the color, and the change in the hue H, the brightness I, and the saturation S can be clearly expressed.
  • An object of the present invention is to provide a method for improving the contrast of an OLED display panel, which can improve the contrast of the OLED display panel, improve the display quality of the OLED display panel, and reduce the power consumption of the OLED display panel.
  • Another object of the present invention is to provide a system for improving the contrast of an OLED display panel, which can improve the contrast of the OLED display panel, improve the display quality of the OLED display panel, and reduce the power consumption of the OLED display panel.
  • the present invention provides a method for improving the contrast of an OLED display panel, comprising the following steps:
  • Step 1 Providing a raw RGB signal and a raw low driving voltage of a picture to be input to the OLED display panel;
  • Step 2 Converting the original RGB signal to an HSI color space composed of a hue component, a saturation component, and a luminance component;
  • Step 3 performing histogram statistics on the luminance component to obtain a histogram of the luminance component
  • Step 4 Obtain a transformation parameter according to a histogram calculation of the luminance component
  • Step 5 keeping the hue component and the saturation component unchanged, and performing enhancement processing on the luminance component by the contrast enhancement method to obtain a new luminance component;
  • Step 6 Calculate a new low driving voltage by transforming the parameters and the original low driving voltage.
  • Step 7 Convert a hue component, a saturation component, and a new luminance component into an RGB color space to obtain a new R'G'B' signal, and input a new R'G'B' signal and a new low driving voltage into the OLED.
  • a pixel driving circuit in the display panel, and the OLED display panel displays a new image with enhanced contrast.
  • Step 51 calculating the absolute value Q1 of the difference between the luminance values of the adjacent two rows of pixels in the same column and the first luminance value weight k1;
  • the absolute value Q1 of the difference in luminance values of pixels adjacent to each other in the same column is calculated as:
  • the calculation formula of the first brightness value weight k1 is:
  • the absolute value Q1 of the difference between the luminance values of the adjacent two rows of pixels in the same column ranges from 0 to 255, and n is a positive integer greater than 1.
  • I(i,j) is the luminance value of the pixel in the jth column of the i-th row
  • I(i+1,j) is the i+th
  • H1(a) is the number of pixels whose luminance value is a
  • C1(Y) is from the luminance value I(i,j) to the luminance value I(i+1,j)
  • Step 52 calculating the absolute value Q2 of the difference between the brightness values of the adjacent two columns of pixels in the same row and the second brightness value weight k2;
  • the absolute value Q2 of the difference in luminance values of pixels adjacent to each other in the same row is calculated as:
  • the calculation formula of the second brightness value weight k2 is:
  • the absolute value Q2 of the difference between the luminance values of the adjacent two columns of pixels in the same row is in the range of 0. 255, n is a positive integer greater than 1 and is the same as the value in step 51;
  • I(i,j) is the luminance value of the pixel in the i-th row and the j-th column
  • I(i, j+1) is the ith row.
  • the luminance value of the j+1th column pixel, H3(a) is the number of pixels whose luminance value is a, and C3(Y) is from the luminance value I(i,j) to the luminance value I(i,j+1)
  • Step 53 adding C1 (Y) in step 51 and C3 (Y) in step 52 to obtain C (Y);
  • Step 54 The maximum value is normalized, and the calculation formula is:
  • the specific process of obtaining the transformation parameter according to the histogram calculation of the luminance component in the step 4 is: first obtaining the largest number of luminance values and the maximum luminance values from the histogram of the luminance components;
  • the transformation parameters are obtained according to the maximum number of brightness values and the maximum brightness value.
  • the OLED display panel is an AMOLED display panel.
  • the pixel driving circuit in the OLED display panel comprises: a first thin film transistor, a second thin film transistor, and a capacitor, a gate input scan signal of the first thin film transistor, and a source input by a new R'G a data signal composed of a 'B' signal, the drain is electrically connected to a gate of the second thin film transistor and one end of the capacitor; a drain of the second thin film transistor is electrically connected to a high driving voltage, and the source is electrically connected to the organic
  • the anode of the light-emitting diode; the cathode of the organic light-emitting diode inputs a new low driving voltage; one end of the capacitor is electrically connected to the drain of the first thin film transistor, and the other end is electrically connected to the drain of the second thin film transistor.
  • the invention also provides a system for improving the contrast of an OLED display panel, comprising:
  • a first conversion module configured to receive a raw RGB signal and a raw low driving voltage of a picture to be input into the OLED display panel, and convert the original RGB signal into an HSI color space composed of a hue component, a saturation component, and a luminance component;
  • Contrast enhancement module electrically connected to the first conversion module for straightening the luminance component
  • the square graph statistics and contrast enhancement processing obtain new luminance components and transform parameters, and obtain a new low driving voltage by transforming the parameters and the original low driving voltage.
  • the second conversion module is electrically connected to the contrast enhancement module and the OLED display panel, and is configured to convert the hue component, the saturation component, and the new luminance component into the RGB color space to obtain the R'G'B' signal, and the new R The 'G'B' signal and the new low drive voltage are input to the pixel drive circuitry within the OLED display panel such that the OLED display panel displays a new image with enhanced contrast.
  • the OLED display panel is an AMOLED display panel.
  • the pixel driving circuit in the OLED display panel comprises: a first thin film transistor, a second thin film transistor, and a capacitor, a gate input scan signal of the first thin film transistor, and a source input by a new R'G a data signal composed of a 'B' signal, the drain is electrically connected to a gate of the second thin film transistor and one end of the capacitor; a drain of the second thin film transistor is electrically connected to a high driving voltage, and the source is electrically connected to the organic
  • the anode of the light-emitting diode; the cathode of the organic light-emitting diode inputs a new low driving voltage; one end of the capacitor is electrically connected to the drain of the first thin film transistor, and the other end is electrically connected to the drain of the second thin film transistor.
  • the invention also provides a system for improving the contrast of an OLED display panel, comprising:
  • a first conversion module configured to receive a raw RGB signal and a raw low driving voltage of a picture to be input into the OLED display panel, and convert the original RGB signal into an HSI color space composed of a hue component, a saturation component, and a luminance component;
  • the contrast enhancement module is electrically connected to the first conversion module for performing histogram statistics and contrast enhancement processing on the luminance component, obtaining new luminance components and transformation parameters, and obtaining a new low by transforming the parameters and calculating the original low driving voltage.
  • a second conversion module electrically connected to the contrast enhancement module and the OLED display panel, configured to convert the hue component, the saturation component, and the new luminance component into the RGB color space to obtain a new R'G'B' signal, which will be new
  • the R'G'B' signal and the new low driving voltage are input to the pixel driving circuit in the OLED display panel, so that the OLED display panel displays a new image with enhanced contrast;
  • the OLED display panel is an AMOLED display panel
  • the pixel driving circuit in the OLED display panel comprises: a first thin film transistor, a second thin film transistor, and a capacitor, the gate of the first thin film transistor inputs a scan signal, and the source input is replaced by a new R a data signal composed of a signal of a 'G'B', a drain electrically connected to a gate of the second thin film transistor, and one end of the capacitor; a drain of the second thin film transistor is electrically connected to a high driving voltage, and the source is electrically An anode of the organic light emitting diode is connected; a cathode of the organic light emitting diode is input with a new low driving voltage; one end of the capacitor is electrically connected to the drain of the first thin film transistor, and the other end is electrically connected to the drain of the second thin film transistor.
  • the present invention provides a method for improving the contrast of an OLED display panel by converting the original RGB signal into an HSI color space composed of a hue component, a saturation component, and a luminance component, and then performing a histogram on the luminance component.
  • Graph statistics obtain the histogram of the luminance component, obtain the transform parameters according to the histogram of the luminance component, calculate the new low driving voltage by transforming the parameters combined with the original low driving voltage, while keeping the hue component and the saturation component unchanged, and the brightness
  • the component is enhanced to obtain a new luminance component, and then the hue component, the saturation component, and the new luminance component are converted to the RGB color space to obtain the R'G'B' signal, and the R'G'B' signal and the new
  • the low driving voltage is provided to the pixel driving circuit, which can improve the contrast of the OLED display panel, improve the display quality of the OLED display panel, and reduce the power consumption of the OLED display panel.
  • the system for improving the contrast of an OLED display panel can improve the contrast of the OLED display panel, improve the display quality of the OLED display panel, and reduce the power consumption of the OLED display panel.
  • FIG. 1 is a circuit diagram of a conventional AMOLED 2T1C pixel driving circuit
  • 2 is a graph showing the relationship between the voltage across the organic light emitting diode and the driving current
  • 3 is a graph showing a relationship between a driving current and a brightness of an organic light emitting diode
  • FIG. 4 is a flow chart of a method for improving contrast of an OLED display panel according to the present invention.
  • FIG. 5 is a schematic diagram of signal conversion in a method for improving contrast of an OLED display panel according to the present invention.
  • FIG. 6 is a schematic diagram of a screen to be input to an OLED display panel under the original RGB signal and the original low driving voltage;
  • step 7 is a histogram of a luminance component in step 3 of the method for improving the contrast of an OLED display panel according to the present invention.
  • FIG. 9 is a schematic diagram of a screen of an input OLED display panel processed by the method for improving contrast of an OLED display panel according to the present invention.
  • FIG. 10 is a structural block diagram of a system for improving contrast of an OLED display panel according to the present invention.
  • FIG. 11 is a circuit diagram of a 2T1C pixel driving circuit in a system for improving contrast of an OLED display panel of the present invention.
  • the present invention first provides a method for improving the contrast of an OLED display panel, including the following steps:
  • Step 1 Provide the original RGB signal of the picture to be input to the OLED display panel and the original low driving voltage OVSS.
  • the contrast of the picture to be input to the OLED display panel under the original RGB signal and the original low driving voltage OVSS is low, which affects the display quality of the OLED display panel.
  • Step 2 Convert the original RGB signal to an HSI color space composed of a hue component H, a saturation component S, and a luminance component I.
  • Step 3 As shown in FIG. 7, the luminance component I is subjected to histogram statistics to obtain a histogram of the luminance component I, which is unevenly distributed in the comparison set of the histogram representation.
  • Step 4 Obtain a transformation parameter according to a histogram calculation of the luminance component shown in FIG.
  • the specific process of obtaining the transformation parameter according to the histogram calculation of the luminance component I in the step 4 is:
  • the transformation parameters are obtained according to the maximum number of brightness values and the maximum brightness value.
  • Step 5 Keeping the hue component H and the saturation component S unchanged, and performing enhancement processing on the luminance component I to obtain a new luminance component I'.
  • step 5 of performing enhancement processing on the luminance component I by the contrast enhancement method to obtain a new luminance component I' is:
  • Step 51 calculating the absolute value Q1 of the difference between the luminance values of the adjacent two rows of pixels in the same column and the first luminance value weight k1;
  • the absolute value Q1 of the difference in luminance values of pixels adjacent to each other in the same column is calculated as:
  • the calculation formula of the first brightness value weight k1 is:
  • the absolute value Q1 of the difference between the luminance values of the adjacent two rows of pixels in the same column ranges from 0 to 255, and n is a positive integer greater than 1.
  • I(i,j) is the luminance value of the pixel in the jth column of the i-th row
  • I(i+1,j) is the i+th
  • H1(a) is the number of pixels whose luminance value is a
  • C1(Y) is from the luminance value I(i,j) to the luminance value I(i+1,j)
  • Step 52 calculating the absolute value Q2 of the difference between the brightness values of the adjacent two columns of pixels in the same row and the second brightness value weight k2;
  • the absolute value Q2 of the difference in luminance values of pixels adjacent to each other in the same row is calculated as:
  • the calculation formula of the second brightness value weight k2 is:
  • the absolute value Q2 of the difference between the luminance values of the adjacent two columns of pixels in the same row ranges from 0 to 255, where n is a positive integer greater than 1 and is the same as the value in step 51;
  • I(i,j) is the luminance value of the pixel in the i-th row and the j-th column
  • I(i, j+1) is the ith row.
  • the luminance value of the j+1th column pixel, H3(a) is the number of pixels whose luminance value is a, and C3(Y) is from the luminance value I(i,j) to the luminance value I(i,j+1)
  • Step 53 adding C1 (Y) in step 51 and C3 (Y) in step 52 to obtain C (Y);
  • Step 54 The maximum value is normalized, and the calculation formula is:
  • the histogram of the new luminance component I' subjected to the contrast enhancement processing in this step 5 is as shown in Fig. 8. After processing, the new luminance component I' is more uniformly distributed in the histogram.
  • Step 7 Convert the hue component H, the saturation component S, and the new luma component I' to the RGB color space to obtain a new R'G'B' signal, and the new R'G'B' signal and the new low
  • the driving voltage OVSS' is input to the pixel driving circuit in the OLED display panel, and the OLED display panel displays a contrast-enhanced new image as shown in FIG. 9 to improve the display quality of the OLED display panel.
  • the OLED display panel may select an AMOLED display panel.
  • the pixel driving circuit in the OLED display panel can select a 2T1C pixel driving circuit, including: a first thin film transistor T1, a second thin film transistor T2, and a capacitor C, the first thin film transistor
  • the gate of the T1 input scan signal GN the source input is a data signal SN composed of a new R'G'B' signal, and the drain is electrically connected to the gate of the second thin film transistor T2 and one end of the capacitor C;
  • the drain of the second thin film transistor T2 is electrically connected to the high driving voltage OVDD, 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 input with a new low driving voltage OVSS'; the capacitor C One end is electrically connected to the drain of the first thin film transistor T1, and the other end is electrically connected to the drain of the second thin film transistor T2.
  • the voltage difference ⁇ Voled between the anode and the cathode of the organic light-emitting diode D can be reduced by inputting a new low driving voltage OVSS' to the cathode of the organic light-emitting diode D, thereby reducing the consumption of the OLED display panel. Electricity.
  • the present invention further provides a system for improving the contrast of an OLED display panel, including:
  • a first conversion module receiving the original RGB signal and the original low driving voltage OVSS of the picture to be input to the OLED display panel, and converting the original RGB signal to the HSI color composed of the hue component H, the saturation component S, and the luminance component I space.
  • the contrast enhancement module is electrically connected to the first conversion module for performing histogram statistics and contrast enhancement processing on the luminance component I, obtaining a new luminance component I′ and a transformation parameter X, and transforming the parameter X and the original low driving voltage.
  • the second conversion module is electrically connected to the contrast enhancement module and the OLED display panel, and is configured to convert the hue component H, the saturation component S, and the new luminance component I′ into the RGB color space to obtain a new R′G′B′ signal.
  • the new R'G'B' signal and the new low driving voltage OVSS' are input to the pixel driving circuit in the OLED display panel, so that the OLED display panel displays a new image with enhanced contrast.
  • the OLED display panel may select an AMOLED display panel.
  • the pixel driving circuit in the OLED display panel can select a 2T1C pixel driving circuit, including: a first thin film transistor T1, a second thin film transistor T2, and a capacitor C, the first thin film transistor
  • the gate of the T1 input scan signal GN the source input is a data signal SN composed of a new R'G'B' signal, and the drain is electrically connected to the gate of the second thin film transistor T2 and one end of the capacitor C;
  • the drain of the second thin film transistor T2 is electrically connected to the high driving voltage OVDD, 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 input with a new low driving voltage OVSS';
  • One end is electrically connected to the drain of the first thin film transistor T1, and the other end is electrically connected to the drain of the second thin film transistor T2.
  • the system for improving the contrast of an OLED display panel of the present invention converts the original RGB signal into an HSI color space composed of the hue component H, the saturation component S, and the luminance component I through the first conversion module, and the luminance component I through the contrast enhancement module Perform histogram statistics and contrast enhancement processing to obtain a new luminance component I' and transform parameter X, and transform the parameter X and the original low-drive
  • the dynamic voltage OVSS is calculated to obtain a new low driving voltage OVSS', and then the second conversion module converts the hue component H, the saturation component S, and the new luminance component I' into the RGB color space to obtain a new R'G'B'.
  • the signal which inputs the new R'G'B' signal and the new low driving voltage OVSS' into the pixel driving circuit in the OLED display panel, enables the OLED display panel to display a new image with enhanced contrast.
  • the cathode of the organic light-emitting diode D inputs a new low driving voltage OVSS', the voltage difference ⁇ Voled between the anode and the cathode of the organic light-emitting diode D can be reduced, thereby reducing the power consumption of the OLED display panel. .
  • the method for improving the contrast of an OLED display panel of the present invention is obtained by converting a raw RGB signal into an HSI color space composed of a hue component, a saturation component, and a luminance component, and then performing histogram statistics on the luminance component.
  • the histogram of the luminance component obtains the transform parameter according to the histogram of the luminance component, and obtains a new low driving voltage by transforming the parameter combined with the original low driving voltage, while maintaining the hue component and the saturation component unchanged, and enhancing the luminance component
  • Obtain a new luminance component then convert the tonal component, the saturation component, and the new luminance component to the RGB color space to obtain the R'G'B' signal, and the R'G'B' signal and the new low driving voltage.
  • Provided to the pixel driving circuit can improve the contrast of the OLED display panel, improve the display quality of the OLED display panel, and reduce the power consumption of the OLED display panel.
  • the system for improving the contrast of the OLED display panel of the invention can improve the contrast of the OLED display panel, improve the display quality of the OLED display panel, and reduce the power consumption of the OLED display panel.

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Abstract

一种提升OLED显示面板对比度的方法及系统。该方法通过将原始RGB信号转换到由色调分量、饱和度分量、和亮度分量构成的HSI颜色空间，再对亮度分量进行直方图统计，获得亮度分量的直方图，依据亮度分量的直方图获得变换参数，通过变换参数结合原始低驱动电压计算得到新的低驱动电压，同时保持色调分量和饱和度分量不变，对亮度分量进行增强处理获得新的亮度分量，再将色调分量、饱和度分量和新的亮度分量转换至RGB颜色空间，获得R'G'B'信号，并将R'G'B'信号和新的低驱动电压提供给像素驱动电路，能够提升OLED显示面板的对比度，提升OLED显示面板的显示质量，降低OLED显示面板的耗电量。

Description

提升OLED显示面板对比度的方法及系统 技术领域
本发明涉及显示技术领域，尤其涉及一种提升OLED显示面板对比度的方法及系统。
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矩阵寻址两类。其中，AMOLED具有呈阵列式排布的像素，属于主动显示类型，发光效能高，通常用作高清晰度的大尺寸显示装置。
AMOLED是电流驱动器件，当有电流流过有机发光二极管时，有机发光二极管发光，且发光亮度由流过有发光二极管自身的电流决定。如图1所示，最常用的AMOLED像素驱动电路包括两个薄膜晶体管(Thin Film Transistor，TFT)与一个电容(Capacitor)，即2T1C像素驱动电路。具体的，2T1C像素驱动电路包括一第一薄膜晶体管T1、一第二薄膜晶体管T2、及一电容C，所述第一薄膜晶体管T1为开关薄膜晶体管，所述第二薄膜晶体管T2为驱动薄膜晶体管，所述电容C为存储电容。所述第一薄膜晶体管T1的栅极电性连接扫描信号GN，源极电性连接数据信号SN，漏极与第二薄膜晶体管T2的栅极、及电容C的一端电性连接；所述第二薄膜晶体管T2的漏极电性连接高驱动电压OVDD，源极电性连接有机发光二级管D的阳极；有机发光二级管D的阴极电性连接低驱动电压OVSS；电容C的一端电性连接第一薄膜晶体管T1的漏极，另一端电性连接第二薄膜晶体管T2的漏极。AMOLED显示时，扫描信号GN控制第一薄膜晶体管T1导通，数据信号SN经过第一薄膜晶体管T1进入到第二薄膜晶体管T2的栅极及电容C，然后第一薄膜晶体管T1截止，由于电容C的存储作用，第二薄膜晶体管T2的栅极电压仍可继续保持数据信号电压，使得第二薄膜晶体管T2处于导通状态，驱动电流Ioled通过第二薄膜晶体管T2进入有机发光二 级管D，驱动有机发光二级管D发光。其中，有机发光二极管D的发光亮度与通过该有机发光二极管D的驱动电流Ioled有关，而Ioled又受到有机发光二极管D的阳极与阴极之间的电压ΔVoled的影响，如图2所示，随着ΔVoled的增大，Ioled也不断增大，而ΔVoled＝Vs-OVSS，其中Vs为第二薄膜晶体管T2的源极电压，OVSS为低驱动电压，有机发光二极管D的耗电功率P＝Ioled×ΔVoled，因此，如图3所示，随着Ioled的增大有机发光二极管D的亮度Lum也逐渐增大。
随着OLED显示技术的不断发展，消费者对于OLED显示面板的显示质量的要求越来越高，需要进一步提升OLED显示面板的对比度，以提升OLED显示面板的显示质量。现有技术通常是在RGB空间模型下直接对图像进行对比度的加强处理，这种处理方法容易产生颜色丢失的缺陷，而HSI是一种根据颜色的直观特性而建立的颜色空间模型，该HSI颜色空间是从人的视觉系统出发，用色调H、饱和度S和亮度I来描述色彩，能够清楚的表现出色调H、亮度I和饱和度S的变化。
发明内容
本发明的目的在于提供一种提升OLED显示面板对比度的方法，通过该方法能够提升OLED显示面板的对比度，提升OLED显示面板的显示质量，同时降低OLED显示面板的耗电量。
本发明的目的还在于提供一种提升OLED显示面板对比度的系统，该系统能够提升OLED显示面板的对比度，提升OLED显示面板的显示质量，同时降低OLED显示面板的耗电量。
为实现上述目的，本发明提供一种提升OLED显示面板对比度的方法，包括如下步骤：
步骤1、提供拟输入OLED显示面板的画面的原始RGB信号和原始低驱动电压；
步骤2、将原始RGB信号转换到由色调分量、饱和度分量、和亮度分量构成的HSI颜色空间；
步骤3、对亮度分量进行直方图统计，获得亮度分量的直方图；
步骤4、根据亮度分量的直方图计算获得变换参数；
步骤5、保持色调分量和饱和度分量不变，通过对比度增强方法对亮度分量进行增强处理获得新的亮度分量；
步骤6、通过变换参数和原始低驱动电压计算获得新的低驱动电压，计算公式为：OVSS’＝K×X×OVSS，其中OVSS’为新的低驱动电压，K为一 常数值系数，X为变换参数，OVSS为原始低驱动电压；
步骤7、将由色调分量、饱和度分量、和新的亮度分量转换到RGB颜色空间获得新的R’G’B’信号，将新的R’G’B’信号和新的低驱动电压输入OLED显示面板内的像素驱动电路，OLED显示面板显示对比度增强的新图像。
所述步骤5中通过对比度增强方法对亮度分量进行增强处理获得新的亮度分量的具体过程为：
步骤51、计算每同一列相邻两行像素的亮度值的差的绝对值Q1和第一亮度值权重k1；
每同一列相邻两行像素的亮度值的差的绝对值Q1的计算公式为：
Q1＝abs(I(i，j)－I(i+1，j))
第一亮度值权重k1的计算公式为：
Figure PCTCN2015092793-appb-000001
其中，同一列相邻两行像素的亮度值的差的绝对值Q1的取值范围为0至255，n为大于1的正整数；
依据第一亮度值权重k1与每同一列相邻两行像素的亮度值进行累加计算，计算公式为：
Figure PCTCN2015092793-appb-000002
其中，i、j为正整数，分别代表像素所在的行数与列数，I(i,j)为第i行第j列像素的亮度值，I(i+1,j)为第i+1行第j列像素的亮度值，H1(a)为亮度值为a的像素数量，C1(Y)为从亮度值I(i,j)到亮度值I(i+1，j)之间各个亮度值对应的像素数量之和；
步骤52、计算每同一行相邻两列像素的亮度值的差的绝对值Q2和第二亮度值权重k2；
每同一行相邻两列像素的亮度值的差的绝对值Q2的计算公式为：
Q2＝abs(I(i，j)－I(i，j+1))
第二亮度值权重k2的计算公式为：
Figure PCTCN2015092793-appb-000003
其中，同一行相邻两列像素的亮度值的差的绝对值Q2的取值范围为0 至255，n为大于1的正整数且与步骤51中的取值相同；
依据第二亮度值权重k2与每同一行相邻两列像素的亮度值进行累加计算，计算公式为：
Figure PCTCN2015092793-appb-000004
其中，i、j为正整数，分别代表像素所在的行数与列数，I(i,j)为第i行第j列像素的亮度值，I(i,j+1)为第i行第j+1列像素的亮度值，H3(a)为亮度值为a的像素数量，C3(Y)为从亮度值I(i,j)到亮度值I(i，j+1)之间各个亮度值对应的像素数量之和；
步骤53、将步骤51中的C1(Y)与步骤52中C3(Y)相加得到C(Y)；
C(Y)＝C1(Y)+C3(Y)
步骤54、最大值归一化，计算公式为：
Figure PCTCN2015092793-appb-000005
再将N(Y)乘以255计算得到增强亮度表out(Y)，并通过查表得到新的亮度值I’＝out(I(i,j))。
所述步骤4中根据亮度分量的直方图计算获得变换参数的具体过程为：先从亮度分量的直方图中获取数量最多的亮度值和数值最大的亮度值；
再依据数量最多的亮度值和数值最大的亮度计算获得变换参数，计算公式为：X＝Max(hist(I))/Max(I)，其中，X为变换参数，Max(hist(I))为数量最多的亮度值，Max(I)为数值最大的亮度值。
所述OLED显示面板为AMOLED显示面板。
所述OLED显示面板内的像素驱动电路包括：一第一薄膜晶体管、一第二薄膜晶体管、及一电容，所述第一薄膜晶体管的栅极输入扫描信号，源极输入由新的R’G’B’信号组成的数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极电性连接高驱动电压，源极电性连接有机发光二级管的阳极；有机发光二级管的阴极输入新的低驱动电压；电容的一端电性连接第一薄膜晶体管的漏极，另一端电性连接第二薄膜晶体管的漏极。
本发明还提供一种提升OLED显示面板对比度的系统，包括：
第一转换模块：用于接收拟输入OLED显示面板的画面的原始RGB信号和原始低驱动电压，并将原始RGB信号转换到由色调分量、饱和度分量、亮度分量构成的HSI颜色空间；
对比度增强模块：与第一转换模块电性连接，用于对亮度分量进行直 方图统计及对比度增强处理，获得新的亮度分量和变换参数，并通过变换参数和原始低驱动电压计算获得新的低驱动电压，计算公式为：OVSS’＝K×X×OVSS，其中OVSS’为新的低驱动电压，K为一常数值系数，X为变换参数，OVSS为原始低驱动电压；
第二转换模块：与对比度增强模块及OLED显示面板电性连接，用于将色调分量、饱和度分量、和新的亮度分量转换到RGB颜色空间获得R’G’B’信号，将新的R’G’B’信号和新的低驱动电压输入OLED显示面板内的像素驱动电路，使得OLED显示面板显示对比度增强的新图像。
所示对比度增强模块获得变换参数X的计算公式为：X＝Max(hist(I))/Max(I)，其中，X为变换参数，Max(hist(I))为数量最多的亮度值，Max(I)为数值最大的亮度值。
所述OLED显示面板为AMOLED显示面板。
所述OLED显示面板内的像素驱动电路包括：一第一薄膜晶体管、一第二薄膜晶体管、及一电容，所述第一薄膜晶体管的栅极输入扫描信号，源极输入由新的R’G’B’信号组成的数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极电性连接高驱动电压，源极电性连接有机发光二级管的阳极；有机发光二级管的阴极输入新的低驱动电压；电容的一端电性连接第一薄膜晶体管的漏极，另一端电性连接第二薄膜晶体管的漏极。
本发明还提供一种提升OLED显示面板对比度的系统，包括：
第一转换模块：用于接收拟输入OLED显示面板的画面的原始RGB信号和原始低驱动电压，并将原始RGB信号转换到由色调分量、饱和度分量、亮度分量构成的HSI颜色空间；
对比度增强模块：与第一转换模块电性连接，用于对亮度分量进行直方图统计及对比度增强处理，获得新的亮度分量和变换参数，并通过变换参数和原始低驱动电压计算获得新的低驱动电压，计算公式为：OVSS’＝K×X×OVSS，其中OVSS’为新的低驱动电压，K为一常数值系数，X为变换参数，OVSS为原始低驱动电压；
第二转换模块：与对比度增强模块及OLED显示面板电性连接，用于将色调分量、饱和度分量、和新的亮度分量转换到RGB颜色空间获得新的R’G’B’信号，将新的R’G’B’信号和新的低驱动电压输入OLED显示面板内的像素驱动电路，使得OLED显示面板显示对比度增强的新图像；
其中，所示对比度增强模块获得变换参数的计算公式为：X＝Max(hist(I))/Max(I)，其中，X为变换参数，Max(hist(I))为数量最多的亮度 值，Max(I)为数值最大的亮度值；
其中，所述OLED显示面板为AMOLED显示面板；
其中，所述OLED显示面板内的像素驱动电路包括：一第一薄膜晶体管、一第二薄膜晶体管、及一电容，所述第一薄膜晶体管的栅极输入扫描信号，源极输入由新的R’G’B’信号组成的数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极电性连接高驱动电压，源极电性连接有机发光二级管的阳极；有机发光二级管的阴极输入新的低驱动电压；电容的一端电性连接第一薄膜晶体管的漏极，另一端电性连接第二薄膜晶体管的漏极。
本发明的有益效果：本发明提供的一种提升OLED显示面板对比度的方法，通过将原始RGB信号转换到由色调分量、饱和度分量、和亮度分量构成的HSI颜色空间，再对亮度分量进行直方图统计，获得亮度分量的直方图，依据亮度分量的直方图获得变换参数，通过变换参数结合原始低驱动电压计算得到新的低驱动电压，同时保持色调分量、和饱和度分量不变，对亮度分量进行增强处理获得新的亮度分量，再将色调分量、饱和度分量、和新的亮度分量转换至RGB颜色空间，获得R’G’B’信号，并将R’G’B’信号和新的低驱动电压提供给像素驱动电路，能够提升OLED显示面板的对比度，提升OLED显示面板的显示质量，降低OLED显示面板的耗电量。本发明提供的一种提升OLED显示面板对比度的系统，能够提升OLED显示面板的对比度，提升OLED显示面板的显示质量，降低OLED显示面板的耗电量。
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为现有的AMOLED 2T1C像素驱动电路的电路图；
图2为有机发光二极管的两端的电压与驱动电流的关系曲线图；
图3为驱动电流与有机发光二极管亮度的关系曲线图；
图4为本发明的提升OLED显示面板对比度的方法的流程图；
图5为本发明的提升OLED显示面板对比度的方法中信号的变换示意 图；
图6为在原始RGB信号和原始低驱动电压下拟输入OLED显示面板的画面的示意图；
图7为本发明的提升OLED显示面板对比度的方法步骤3中亮度分量的直方图；
图8为本发明的提升OLED显示面板对比度的方法步骤5中经对比度增强处理后获得的新的亮度分量的直方图；
图9为经本发明的提升OLED显示面板对比度的方法处理后的输入OLED显示面板的画面的示意图；
图10为本发明的提升OLED显示面板对比度的系统的结构框图；
图11为本发明的提升OLED显示面板对比度的系统中2T1C像素驱动电路的电路图。
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。
请同时参阅图4与图5，本发明首先提供一种提升OLED显示面板对比度的方法，包括如下步骤：
步骤1、提供拟输入OLED显示面板的画面的原始RGB信号和原始低驱动电压OVSS。
如图6所示，在原始RGB信号和原始低驱动电压OVSS下拟输入OLED显示面板的画面的对比度较低，影响了OLED显示面板的显示质量。
步骤2、将原始RGB信号转换到由色调分量H、饱和度分量S、和亮度分量I构成的HSI颜色空间。
步骤3、如图7所示，对亮度分量I进行直方图统计，获得亮度分量I的直方图，该亮度分量I在直方图表现的比较集中，分布不均匀。
步骤4、根据图7所示的亮度分量的直方图计算获得变换参数。
具体地，该步骤4中根据亮度分量I的直方图计算获得变换参数的具体过程为：
先从亮度分量I的直方图中获取数量最多的亮度值和数值最大的亮度值；
再依据数量最多的亮度值和数值最大的亮度计算获得变换参数，计算公式为：X＝Max(hist(I))/Max(I)，其中，X为变换参数，Max(hist(I))为数量最多的亮度值，Max(I)为数值最大的亮度值。
步骤5、保持色调分量H和饱和度分量S不变，对亮度分量I进行增强处理获得新的亮度分量I’。
具体地，该步骤5通过对比度增强方法对亮度分量I进行增强处理获得新的亮度分量I’的具体过程为：
步骤51、计算每同一列相邻两行像素的亮度值的差的绝对值Q1和第一亮度值权重k1；
每同一列相邻两行像素的亮度值的差的绝对值Q1的计算公式为：
Q1＝abs(I(i，j)－I(i+1，j))
第一亮度值权重k1的计算公式为：
Figure PCTCN2015092793-appb-000006
其中，同一列相邻两行像素的亮度值的差的绝对值Q1的取值范围为0至255，n为大于1的正整数；
依据第一亮度值权重k1与每同一列相邻两行像素的亮度值进行累加计算，计算公式为：
Figure PCTCN2015092793-appb-000007
其中，i、j为正整数，分别代表像素所在的行数与列数，I(i,j)为第i行第j列像素的亮度值，I(i+1,j)为第i+1行第j列像素的亮度值，H1(a)为亮度值为a的像素数量，C1(Y)为从亮度值I(i,j)到亮度值I(i+1，j)之间各个亮度值对应的像素数量之和；
步骤52、计算每同一行相邻两列像素的亮度值的差的绝对值Q2和第二亮度值权重k2；
每同一行相邻两列像素的亮度值的差的绝对值Q2的计算公式为：
Q2＝abs(I(i，j)－I(i，j+1))
第二亮度值权重k2的计算公式为：
Figure PCTCN2015092793-appb-000008
其中，同一行相邻两列像素的亮度值的差的绝对值Q2的取值范围为0至255，n为大于1的正整数且与步骤51中的取值相同；
依据第二亮度值权重k2与每同一行相邻两列像素的亮度值进行累加计算，计算公式为：
Figure PCTCN2015092793-appb-000009
其中，i、j为正整数，分别代表像素所在的行数与列数，I(i,j)为第i行第j列像素的亮度值，I(i,j+1)为第i行第j+1列像素的亮度值，H3(a)为亮度值为a的像素数量，C3(Y)为从亮度值I(i,j)到亮度值I(i，j+1)之间各个亮度值对应的像素数量之和；
步骤53、将步骤51中的C1(Y)与步骤52中C3(Y)相加得到C(Y)；
C(Y)＝C1(Y)+C3(Y)
步骤54、最大值归一化，计算公式为：
Figure PCTCN2015092793-appb-000010
再将N(Y)乘以255计算得到增强亮度表out(Y)，并通过查表得到新的亮度值I’＝out(I(i,j))。
经过该步骤5做过对比度增强处理的新的亮度分量I’的直方图如图8所示，经过处理后新的亮度分量I’在直方图中分布的更均匀。
步骤6、通过变换参数X和原始低驱动电压OVSS计算获得新的低驱动电压OVSS’，计算公式为：OVSS’＝K×X×OVSS，其中OVSS’为新的低驱动电压，K为一常数值系数，X为变换参数，OVSS为原始低驱动电压。
步骤7、将由色调分量H、饱和度分量S、和新的亮度分量I’转换到RGB颜色空间获得新的R’G’B’信号，将新的R’G’B’信号和新的低驱动电压OVSS’输入OLED显示面板内的像素驱动电路，OLED显示面板显示如图9所示的对比度增强的新图像，提升OLED显示面板的显示质量。
进一步地，所述OLED显示面板可选择AMOLED显示面板。如图11所示，所述OLED显示面板内的像素驱动电路可选择2T1C像素驱动电路，包括：一第一薄膜晶体管T1、一第二薄膜晶体管T2、及一电容C，所述第一薄膜晶体管T1的栅极输入扫描信号GN，源极输入由新的R’G’B’信号组成的数据信号SN，漏极与第二薄膜晶体管T2的栅极、及电容C的一端电性连接；所述第二薄膜晶体管T2的漏极电性连接高驱动电压OVDD，源极电性连接有机发光二级管D的阳极；有机发光二级管D的阴极输入新的低驱动电压OVSS’；电容C的一端电性连接第一薄膜晶体管T1的漏极，另一端电性连接第二薄膜晶体管T2的漏极。
值得一提的是，通过向有机发光二级管D的阴极输入新的低驱动电压OVSS’能够降低有机发光二级管D阳极与阴极之间的电压差ΔVoled，从而能够降低OLED显示面板的耗电量。
请同时参阅图10与图11、结合图5，基于同一发明思路，本发明还提供一种提升OLED显示面板对比度的系统，包括：
第一转换模块：用于接收拟输入OLED显示面板的画面的原始RGB信号和原始低驱动电压OVSS，并将原始RGB信号转换到由色调分量H、饱和度分量S、亮度分量I构成的HSI颜色空间。
对比度增强模块：与第一转换模块电性连接，用于对亮度分量I进行直方图统计及对比度增强处理，获得新的亮度分量I’和变换参数X，并通过变换参数X和原始低驱动电压OVSS计算获得新的低驱动电压OVSS’，计算公式为：OVSS’＝K×X×OVSS，其中OVSS’为新的低驱动电压，K为一常数值系数，X为变换参数，OVSS为原始低驱动电压。
具体地，所述对比度增强模块通过对亮度分量I进行直方图统计，获得亮度分量I的直方图，再从亮度分量I的直方图中获取数量最多的亮度值和数值最大的亮度值，再依据数量最多的亮度值和数值最大的亮度计算获得变换参数X，计算公式为：X＝Max(hist(I))/Max(I)，其中，X为变换参数，Max(hist(I))为数量最多的亮度值，Max(I)为数值最大的亮度值。
第二转换模块：与对比度增强模块及OLED显示面板电性连接，用于将色调分量H、饱和度分量S、新的亮度分量I’转换到RGB颜色空间获得新的R’G’B’信号，将新的R’G’B’信号和新的低驱动电压OVSS’输入OLED显示面板内的像素驱动电路，使得OLED显示面板显示对比度增强的新图像。
进一步地，所述OLED显示面板可选择AMOLED显示面板。如图11所示，所述OLED显示面板内的像素驱动电路可选择2T1C像素驱动电路，包括：一第一薄膜晶体管T1、一第二薄膜晶体管T2、及一电容C，所述第一薄膜晶体管T1的栅极输入扫描信号GN，源极输入由新的R’G’B’信号组成的数据信号SN，漏极与第二薄膜晶体管T2的栅极、及电容C的一端电性连接；所述第二薄膜晶体管T2的漏极电性连接高驱动电压OVDD，源极电性连接有机发光二级管D的阳极；有机发光二级管D的阴极输入新的低驱动电压OVSS’；电容C的一端电性连接第一薄膜晶体管T1的漏极，另一端电性连接第二薄膜晶体管T2的漏极。
本发明的提升OLED显示面板对比度的系统，通过第一转换模块将原始RGB信号转换到由色调分量H、饱和度分量S、和亮度分量I构成的HSI颜色空间，通过对比度增强模块对亮度分量I进行直方图统计及对比度增强处理，获得新的亮度分量I’和变换参数X，并通过变换参数X和原始低驱 动电压OVSS计算获得新的低驱动电压OVSS’，再通过第二转换模块将色调分量H、饱和度分量S、和新的亮度分量I’转换到RGB颜色空间获得新的R’G’B’信号，将新的R’G’B’信号和新的低驱动电压OVSS’输入OLED显示面板内的像素驱动电路，即能使得OLED显示面板显示对比度增强的新图像。另外，由于有机发光二级管D的阴极输入的是新的低驱动电压OVSS’，能够降低有机发光二级管D阳极与阴极之间的电压差ΔVoled，从而能够降低OLED显示面板的耗电量。
综上所述，本发明的提升OLED显示面板对比度的方法，通过将原始RGB信号转换到由色调分量、饱和度分量、和亮度分量构成的HSI颜色空间，再对亮度分量进行直方图统计，获得亮度分量的直方图，依据亮度分量的直方图获得变换参数，通过变换参数结合原始低驱动电压计算得到新的低驱动电压，同时保持色调分量、和饱和度分量不变，对亮度分量进行增强处理获得新的亮度分量，再将色调分量、饱和度分量、和新的亮度分量转换至RGB颜色空间，获得R’G’B’信号，并将R’G’B’信号和新的低驱动电压提供给像素驱动电路，能够提升OLED显示面板的对比度，提升OLED显示面板的显示质量，降低OLED显示面板的耗电量。本发明的提升OLED显示面板对比度的系统，能够提升OLED显示面板的对比度，提升OLED显示面板的显示质量，降低OLED显示面板的耗电量。
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 (10)

  1. 一种提升OLED显示面板对比度的方法，包括如下步骤：
    步骤1、提供拟输入OLED显示面板的画面的原始RGB信号和原始低驱动电压；
    步骤2、将原始RGB信号转换到由色调分量、饱和度分量、和亮度分量构成的HSI颜色空间；
    步骤3、对亮度分量进行直方图统计，获得亮度分量的直方图；
    步骤4、根据亮度分量的直方图计算获得变换参数；
    步骤5、保持色调分量和饱和度分量不变，通过对比度增强方法对亮度分量进行增强处理获得新的亮度分量；
    步骤6、通过变换参数和原始低驱动电压计算获得新的低驱动电压，计算公式为：OVSS’＝K×X×OVSS，其中OVSS’为新的低驱动电压，K为一常数值系数，X为变换参数，OVSS为原始低驱动电压；
    步骤7、将色调分量、饱和度分量、和新的亮度分量转换到RGB颜色空间获得新的R’G’B’信号，将新的R’G’B’信号和新的低驱动电压输入OLED显示面板内的像素驱动电路，OLED显示面板显示对比度增强的新图像。
  2. 如权利要求1所述的提升OLED显示面板对比度的方法，其中，所述步骤5中通过对比度增强方法对亮度分量进行增强处理获得新的亮度分量的具体过程为：
    步骤51、计算每同一列相邻两行像素的亮度值的差的绝对值Q1和第一亮度值权重k1；
    每同一列相邻两行像素的亮度值的差的绝对值Q1的计算公式为：
    Q1＝abs(I(i，j)－I(i+1，j))
    第一亮度值权重k1的计算公式为：
    Figure PCTCN2015092793-appb-100001
    其中，同一列相邻两行像素的亮度值的差的绝对值Q1的取值范围为0至255，n为大于1的正整数；
    依据第一亮度值权重k1与每同一列相邻两行像素的亮度值进行累加计算，计算公式为：
    Figure PCTCN2015092793-appb-100002
    其中，i、j为正整数，分别代表像素所在的行数与列数，I(i,j)为第i行第j列像素的亮度值，I(i+1,j)为第i+1行第j列像素的亮度值，H1(a)为亮度值为a的像素数量，C1(Y)为从亮度值I(i,j)到亮度值I(i+1，j)之间各个亮度值对应的像素数量之和；
    步骤52、计算每同一行相邻两列像素的亮度值的差的绝对值Q2和第二亮度值权重k2；
    每同一行相邻两列像素的亮度值的差的绝对值Q2的计算公式为：
    Q2＝abs(I(i，j)－I(i，j+1))
    第二亮度值权重k2的计算公式为：
    Figure PCTCN2015092793-appb-100003
    其中，同一行相邻两列像素的亮度值的差的绝对值Q2的取值范围为0至255，n为大于1的正整数且与步骤51中的取值相同；
    依据第二亮度值权重k2与每同一行相邻两列像素的亮度值进行累加计算，计算公式为：
    Figure PCTCN2015092793-appb-100004
    其中，i、j为正整数，分别代表像素所在的行数与列数，I(i,j)为第i行第j列像素的亮度值，I(i,j+1)为第i行第j+1列像素的亮度值，H3(a)为亮度值为a的像素数量，C3(Y)为从亮度值I(i,j)到亮度值I(i，j+1)之间各个亮度值对应的像素数量之和；
    步骤53、将步骤51中的C1(Y)与步骤52中C3(Y)相加得到C(Y)；
    C(Y)＝C1(Y)+C3(Y)
    步骤54、最大值归一化，计算公式为：
    Figure PCTCN2015092793-appb-100005
    再将N(Y)乘以255计算得到增强亮度表out(Y)，并通过查表得到新的亮度值I’＝out(I(i,j))。
  3. 如权利要求1所述的提升OLED显示面板对比度的方法，其中，所述步骤4中根据亮度分量的直方图计算获得变换参数的具体过程为：
    先从亮度分量的直方图中获取数量最多的亮度值和数值最大的亮度 值；
    再依据数量最多的亮度值和数值最大的亮度计算获得变换参数，计算公式为：X＝Max(hist(I))/Max(I)，其中，X为变换参数，Max(hist(I))为数量最多的亮度值，Max(I)为数值最大的亮度值。
  4. 如权利要求1所述的提升OLED显示面板对比度的方法，其中，所述OLED显示面板为AMOLED显示面板。
  5. 如权利要求4所述的提升OLED显示面板对比度的方法，其中，所述OLED显示面板内的像素驱动电路包括：一第一薄膜晶体管、一第二薄膜晶体管、及一电容，所述第一薄膜晶体管的栅极输入扫描信号，源极输入由新的R’G’B’信号组成的数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极电性连接高驱动电压，源极电性连接有机发光二级管的阳极；有机发光二级管的阴极输入新的低驱动电压；电容的一端电性连接第一薄膜晶体管的漏极，另一端电性连接第二薄膜晶体管的漏极。
  6. 一种提升OLED显示面板对比度的系统，包括：
    第一转换模块：用于接收拟输入OLED显示面板的画面的原始RGB信号和原始低驱动电压，并将原始RGB信号转换到由色调分量、饱和度分量、亮度分量构成的HSI颜色空间；
    对比度增强模块：与第一转换模块电性连接，用于对亮度分量进行直方图统计及对比度增强处理，获得新的亮度分量和变换参数，并通过变换参数和原始低驱动电压计算获得新的低驱动电压，计算公式为：OVSS’＝K×X×OVSS，其中OVSS’为新的低驱动电压，K为一常数值系数，X为变换参数，OVSS为原始低驱动电压；
    第二转换模块：与对比度增强模块及OLED显示面板电性连接，用于将色调分量、饱和度分量、和新的亮度分量转换到RGB颜色空间获得新的R’G’B’信号，将新的R’G’B’信号和新的低驱动电压输入OLED显示面板内的像素驱动电路，使得OLED显示面板显示对比度增强的新图像。
  7. 如权利要求6所述的提升OLED显示面板对比度的系统，其中，所示对比度增强模块获得变换参数的计算公式为：X＝Max(hist(I))/Max(I)，其中，X为变换参数，Max(hist(I))为数量最多的亮度值，Max(I)为数值最大的亮度值。
  8. 如权利要求6所述的提升OLED显示面板对比度的系统，其中，所述OLED显示面板为AMOLED显示面板。
  9. 如权利要求8所述的提升OLED显示面板对比度的系统，其中，所 述OLED显示面板内的像素驱动电路包括：一第一薄膜晶体管、一第二薄膜晶体管、及一电容，所述第一薄膜晶体管的栅极输入扫描信号，源极输入由新的R’G’B’信号组成的数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极电性连接高驱动电压，源极电性连接有机发光二级管的阳极；有机发光二级管的阴极输入新的低驱动电压；电容的一端电性连接第一薄膜晶体管的漏极，另一端电性连接第二薄膜晶体管的漏极。
  10. 一种提升OLED显示面板对比度的系统，包括：
    第一转换模块：用于接收拟输入OLED显示面板的画面的原始RGB信号和原始低驱动电压，并将原始RGB信号转换到由色调分量、饱和度分量、亮度分量构成的HSI颜色空间；
    对比度增强模块：与第一转换模块电性连接，用于对亮度分量进行直方图统计及对比度增强处理，获得新的亮度分量和变换参数，并通过变换参数和原始低驱动电压计算获得新的低驱动电压，计算公式为：OVSS’＝K×X×OVSS，其中OVSS’为新的低驱动电压，K为一常数值系数，X为变换参数，OVSS为原始低驱动电压；
    第二转换模块：与对比度增强模块及OLED显示面板电性连接，用于将色调分量、饱和度分量、和新的亮度分量转换到RGB颜色空间获得新的R’G’B’信号，将新的R’G’B’信号和新的低驱动电压输入OLED显示面板内的像素驱动电路，使得OLED显示面板显示对比度增强的新图像；
    其中，所示对比度增强模块获得变换参数的计算公式为：X＝Max(hist(I))/Max(I)，其中，X为变换参数，Max(hist(I))为数量最多的亮度值，Max(I)为数值最大的亮度值；
    其中，所述OLED显示面板为AMOLED显示面板；
    其中，所述OLED显示面板内的像素驱动电路包括：一第一薄膜晶体管、一第二薄膜晶体管、及一电容，所述第一薄膜晶体管的栅极输入扫描信号，源极输入由新的R’G’B’信号组成的数据信号，漏极与第二薄膜晶体管的栅极、及电容的一端电性连接；所述第二薄膜晶体管的漏极电性连接高驱动电压，源极电性连接有机发光二级管的阳极；有机发光二级管的阴极输入新的低驱动电压；电容的一端电性连接第一薄膜晶体管的漏极，另一端电性连接第二薄膜晶体管的漏极。
PCT/CN2015/092793 2015-10-13 2015-10-26 提升oled显示面板对比度的方法及系统 Ceased WO2017063223A1 (zh)

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