WO2018058831A1 - Procédé et appareil de réglage de luminosité de rétroéclairage d'un écran d'affichage - Google Patents

Procédé et appareil de réglage de luminosité de rétroéclairage d'un écran d'affichage Download PDF

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Publication number
WO2018058831A1
WO2018058831A1 PCT/CN2016/112702 CN2016112702W WO2018058831A1 WO 2018058831 A1 WO2018058831 A1 WO 2018058831A1 CN 2016112702 W CN2016112702 W CN 2016112702W WO 2018058831 A1 WO2018058831 A1 WO 2018058831A1
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Prior art keywords
osd
brightness
local
control signal
dimming control
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PCT/CN2016/112702
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English (en)
Chinese (zh)
Inventor
杨福军
谢仁礼
张晓东
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深圳Tcl数字技术有限公司
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Publication of WO2018058831A1 publication Critical patent/WO2018058831A1/fr

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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

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a method and an apparatus for adjusting brightness of a display screen.
  • Local Dimming is local backlight adjustment, Local Dimming can reduce the power consumption of the whole machine, improve the light leakage of the LCD screen, improve the picture quality, and can have obvious effects, especially the direct-lit LED backlight with Local Dimming technology can greatly reduce energy consumption and improve display contrast.
  • Local Dimming's backlight adjustment is based on the analysis of the image signal, ie for the highlighted part of the image signal, Local Dimming will increase or maximize the brightness of the LED backlight in this area, while at the same time reducing the brightness of the LED backlight and even turning off the LED backlight for the best contrast in the dark part of the image signal. Due to the backlighting of different areas, the brightness is dynamically changed, which is no longer a fixed maximum value in the past, so the energy consumption can be greatly reduced.
  • the main object of the present invention is to provide a method and a device for adjusting brightness of a display screen backlight, which are intended to solve the problem of adjusting the composite image of the video image and the OSD image in the OSD area during the brightness adjustment process of the existing display screen backlight, thereby causing the OSD interface to be biased. Color, too bright or even flickering problems.
  • the present invention provides a display backlight brightness adjustment method, including the following steps:
  • the step of acquiring the brightness distribution information and the OSD position information in the image signal comprises:
  • the step of outputting the local dimming control signal according to the brightness distribution information and the OSD position information comprises:
  • a local dimming control signal is output according to the local luminance distribution information.
  • the step of outputting the local dimming control signal according to the local brightness distribution information comprises:
  • the local dimming control signal corresponding to the local luminance distribution information is calculated and output by the Local Dimming algorithm.
  • said passing Local includes:
  • the LED backlight and the liquid crystal pixels are partitioned, and the brightness of the LED backlight is adjusted in real time according to the result of the pixel analysis.
  • the method further includes:
  • the backlight brightness of the OSD area is adjusted according to the OSD dimming control signal.
  • the method further includes:
  • a portion of the total dimming control signal corresponding to the OSD region is used as an OSD dimming control signal
  • the OSD dimming control signal is a fixed value.
  • the present invention further provides a display backlight brightness adjustment device, including:
  • An acquiring module configured to acquire brightness distribution information and OSD position information in the image signal
  • An output module configured to determine a local area outside the OSD area and the OSD area according to the OSD position information, and output a local dimming control signal according to the brightness distribution information and the OSD position information;
  • an adjustment module configured to perform backlight brightness adjustment on the local area according to the local dimming control signal.
  • the acquiring module is further configured to number the pixels in the display screen to obtain the OSD location information.
  • the output module comprises:
  • An extracting unit configured to extract brightness distribution information corresponding to the local area, and use the brightness distribution information as local brightness distribution information
  • an output unit configured to output a local dimming control signal according to the local brightness distribution information.
  • the output unit is further used to pass Local
  • the Dimming algorithm calculates and outputs a local dimming control signal corresponding to the local luminance distribution information.
  • the output unit is further configured to partition the LED backlight and the liquid crystal pixel, and perform real-time brightness adjustment on the LED backlight according to the result of the pixel analysis.
  • the acquiring module is further configured to acquire OSD brightness distribution information corresponding to the OSD signal;
  • the output module is further configured to calculate and output an OSD dimming control signal corresponding to the OSD brightness distribution information by using an average value algorithm;
  • the adjustment module is further configured to adjust a backlight brightness of the OSD region according to the OSD dimming control signal.
  • the output module is further configured to output a total dimming control signal according to the brightness distribution information in the acquired image signal;
  • a portion of the total dimming control signal corresponding to the OSD region is used as an OSD dimming control signal
  • the adjustment module is further configured to perform backlight brightness adjustment on a local area according to the local dimming control signal.
  • the OSD dimming control signal is a fixed value.
  • the invention obtains the brightness distribution information and the OSD position information in the image signal; determines the local area outside the OSD area and the OSD area according to the OSD position information, and outputs the local dimming control signal according to the brightness distribution information and the OSD position information; Performing backlight brightness adjustment on a local area according to the local dimming control signal.
  • the OSD area in the image signal is distinguished, and when the backlight brightness is adjusted, the backlight brightness is adjusted to a local area other than the OSD, so that the VIDEO picture of the OSD area and the non-OSD area of the picture is stabilized, and the image is improved. Overall picture quality.
  • FIG. 1 is a schematic flow chart of a first embodiment of a method for adjusting brightness of a display backlight according to the present invention
  • FIG. 2 is a schematic flow chart of an embodiment of step S30 of FIG. 1;
  • FIG. 3 is a schematic diagram of a direct-down Local Dimming principle and a backlight partition
  • FIG. 4 is a schematic flow chart of a second embodiment of a method for adjusting brightness of a display backlight according to the present invention.
  • FIG. 5 is a schematic flow chart of a third embodiment of a method for adjusting brightness of a display backlight according to the present invention.
  • FIG. 6 is a schematic diagram of functional modules of a first embodiment of a display backlight brightness adjusting device according to the present invention.
  • FIG. 7 is a schematic diagram of a refinement function module of an embodiment of the output module of FIG. 6.
  • FIG. 7 is a schematic diagram of a refinement function module of an embodiment of the output module of FIG. 6.
  • the main solution of the embodiment of the present invention is: acquiring brightness distribution information and OSD position information in an image signal; determining an area outside the OSD area and the OSD area according to the OSD position information, and according to the brightness distribution information and the OSD position information. And outputting a local dimming control signal; performing backlight brightness adjustment on the local area according to the local dimming control signal.
  • the OSD area in the image signal is distinguished, and when the backlight brightness is adjusted, the backlight brightness is adjusted to a local area other than the OSD, so that the VIDEO picture of the OSD area and the non-OSD area of the picture is stabilized, and the image is improved. Overall picture quality.
  • the OSD area is adjusted according to the composite image of the video image and the OSD image, causing the OSD interface to be color cast, over-bright or even flicker.
  • the present invention provides a method for adjusting brightness of a display screen backlight.
  • FIG. 1 is a schematic flow chart of a first embodiment of a method for adjusting brightness of a display backlight according to the present invention.
  • the display backlight brightness adjustment method comprises:
  • Step S10 acquiring brightness distribution information and OSD position information in the image signal
  • Liquid crystal displays have long life, power saving, low operating voltage, high color rendering index, low temperature operation, fast response, and environmental protection. Therefore, liquid crystal displays have been widely used in various electronic devices (for example, LCD TVs). Or computer).
  • the display of the liquid crystal display is a passive light-emitting device that cannot emit light by itself, so a backlight must be provided to uniformly illuminate the entire display from the rear surface.
  • the brightness of the picture is determined by the twist angle of the liquid crystal controlled by the image signal voltage and the brightness of the backlight.
  • Partial backlight adjustment is to display a dark area on the screen, control the backlight corresponding to the area to weaken or "extinguished", in the area where the screen is bright, control the backlight corresponding to the area "enhanced", thereby reducing the screen leakage to contrast
  • the effect is to improve the contrast of the displayed image to achieve the purpose of enhancing the image quality.
  • Adjust the menu through the screen can adjust the display characteristics of the display, such as color temperature, brightness, contrast and phase, and different types of OSD may be different in size and position of the display; in order to make the brightness of the display backlight reasonable Adjusting, when acquiring the brightness distribution information in the image signal, the OSD position information is also acquired, so that the OSD area and the area outside the OSD area can be adaptively adjusted to meet the change of the backlight brightness in different image areas in the display screen. Demand.
  • OSD On Screen Display
  • Step S20 determining a local area other than the OSD area and the OSD area according to the OSD position information, and outputting a local dimming control signal according to the brightness distribution information and the OSD position information;
  • the liquid crystal pixels in the display screen are composed of pixel arrays. Therefore, the pixels in the display screen can be numbered.
  • the OSD position information is acquired, the OSD area and the area outside the OSD area in the display screen are determined according to the OSD position information. And the area outside the OSD area is used as the local area; the brightness distribution information in the acquired image signal includes the brightness distribution information in the video signal and the OSD signal, and the brightness of the OSD signal is usually constant, and the OSD area is The area where the OSD image overlaps with the video image.
  • the backlight brightness of the display screen is adjusted according to the video signal and the OSD signal, the backlight brightness of the OSD area changes continuously, causing intermittent flickering and partial color cast of the OSD area. Therefore, when the dimming control signal is output according to the brightness distribution information, the OSD position information is combined to prevent the dimming control signal from performing dynamic backlight brightness adjustment on the OSD area.
  • FIG. 2 is a schematic diagram of a refinement process of an embodiment of step S20 of FIG. 1.
  • the step S20 includes:
  • Step S21 extracting brightness distribution information corresponding to the local area, and using the brightness distribution information as local brightness distribution information;
  • Step S22 outputting a local dimming control signal according to the local brightness distribution information.
  • the brightness distribution information of the OSD area does not participate in the operation of the dimming control signal when calculating the dimming control signal; according to an embodiment of the present invention, according to the OSD position information, The brightness distribution information is divided into brightness distribution information corresponding to the OSD area and brightness distribution information corresponding to the local area, that is, OSD brightness distribution information and local brightness distribution information, and the local dimming control signal is output according to the local brightness distribution information; for example, display
  • the image area in the screen is 1920 ⁇ 1080, and the OSD area is 640 ⁇ 108.
  • the brightness distribution information in the 640 ⁇ 108 OSD area is excluded, and the local tone is output according to the brightness distribution information of the local area of the non-OSD area. Light control signal.
  • the step S22 specifically includes: The Dimming algorithm calculates and outputs a local dimming control signal corresponding to the local luminance distribution information.
  • FIG. 3 is a schematic diagram of a direct-down Local Dimming principle and a backlight partition; due to TFT LCD (Thin Film Transistor Liquid Crystal Display, the pixel itself is not illuminated, it is just a light valve, ie TFT The light and color of the LCD display are represented by the backlight and the color filter on the back; Local Dimming technology first partitions the LED backlight, as shown in Figure 3, 5 ⁇ 8, that is, 40 partitions, the LED brightness of these 40 partitions can be controlled independently and separately. Correspondingly, the liquid crystal pixels are also divided into 40 partitions.
  • TFT LCD Thin Film Transistor Liquid Crystal Display
  • FHD Full Definition (Full HD) screen
  • these 40 partitions each containing 240 ⁇ 216 pixels.
  • Local The Dimming algorithm performs real-time analysis on the grayscale of the pixels in the 40 240 ⁇ 216 partitions, and the LEDs in the LED backlight partition behind it, and performs real-time brightness adjustment based on the results of the pixel analysis.
  • the Dimming algorithm calculates and outputs a local dimming control signal corresponding to the local luminance distribution information. Since the number of pixels in the display screen is much larger than the number of LEDs, for example, the pixels of the display screen are from 1920 ⁇ 1080 to 4096 ⁇ 2160.
  • the number of LEDs is only 288 or 512, etc., therefore, when performing backlight brightness adjustment.
  • Each LED adjusts the brightness of a plurality of pixels. Therefore, the more LEDs, the more partitions in the LED backlight, the higher the accuracy of the backlight brightness adjustment, and the better the effect.
  • Step S30 performing backlight brightness adjustment on the local area according to the local dimming control signal.
  • the local dimming control signal output according to the brightness distribution information of the local area is used for backlight brightness adjustment of the local area, and the OSD area is controlled not to perform backlight brightness adjustment; for example, the image area in the display screen is 1920 ⁇ 1080 pixels, wherein the OSD The area is 640 ⁇ 108 pixels, and the part of the image area that does not include the OSD area is used as the local area, and the local dimming control signal is used to adjust the backlight brightness of the local area.
  • the backlight brightness of the OSD area does not change, and only the local area performs dynamic backlight brightness adjustment in real time, so that the OSD area of the display screen is normal, the local area VIDEO picture is stable, and the overall quality of the displayed image is improved.
  • the OSD area in the image signal is distinguished, and when the backlight brightness is adjusted, the backlight brightness is adjusted to a local area other than the OSD, so that the VIDEO picture of the OSD area of the picture and the local area of the non-OSD area is stable, and Improve the overall picture quality of the image.
  • FIG. 4 is a schematic flow chart of a second embodiment of a method for adjusting brightness of a display backlight according to the present invention. Based on the first embodiment of the display backlight brightness adjustment method, the method further includes:
  • Step S40 acquiring OSD brightness distribution information corresponding to the OSD signal
  • Step S50 calculating and outputting an OSD dimming control signal corresponding to the OSD brightness distribution information by an average value algorithm
  • Step S60 adjusting the backlight brightness of the OSD area according to the OSD dimming control signal.
  • the OSD area is an overlay display of the video image and the OSD image (and the OSD image is on the upper layer of the video image), and the OSD signal corresponding to the OSD image is often a peak white signal, which is characterized by being constant throughout the multi-frame, the pair of pixels
  • the brightness distribution statistics have a large influence, affecting the analysis of the image pixel brightness in the OSD area, and since the OSD image whose OSD signal does not change is displayed on the upper layer, correspondingly, the backlight brightness adjustment may not be performed on the OSD area, but outside the OSD area.
  • the local area uses a dynamic dimming signal, applying Local The Dimming algorithm outputs a local dimming control signal. When performing pixel analysis statistics, the pixels of the OSD area are eliminated.
  • the deviation of the peak white signal of the OSD region from the image signal statistics is avoided.
  • the OSD brightness distribution information corresponding to the OSD signal is obtained, and the value of the OSD dimming control signal is output according to the average value algorithm.
  • the value is a fixed value, which is only related to the OSD brightness distribution information, and does not follow the brightness distribution of the video image signal.
  • the change is changed, that is, the backlight brightness is fixed brightness.
  • the OSD dimming control signal can also be a preset fixed value, for example, the backlight of the OSD area is fully bright. In this way, the dynamic dimming signal generated by the change of the video signal in the OSD area is avoided, and the brightness of the backlight is changed, so that the brightness of the OSD area changes with the brightness distribution of the image content, causing flicker and color cast.
  • the backlight brightness of the OSD area is adjusted, and the backlight brightness of the OSD area is fixed brightness, which is not dynamically adjusted, and the image quality stability of the OSD area is improved.
  • FIG. 5 is a schematic flow chart of a third embodiment of a method for adjusting brightness of a display backlight according to the present invention. Based on the second embodiment of the method for adjusting the backlight brightness of the display screen, the method further includes:
  • Step S70 output a total dimming control signal according to the brightness distribution information in the acquired image signal
  • Step S80 the part corresponding to the OSD area in the total dimming control signal is used as the OSD dimming control signal, and the part corresponding to the local area in the total dimming control signal is used as the local dimming control signal;
  • Step S90 performing backlight brightness adjustment on the local area according to the local dimming control signal, and adjusting the backlight brightness of the OSD area according to the OSD dimming control signal.
  • the OSD dimming control signal and the local dimming control signal are respectively obtained by dividing the luminance distribution information in the image signal into blocks, that is, by Local.
  • the Dimming operation calculates the OSD dimming control signal corresponding to the OSD region and calculates the local dimming control signal corresponding to the local region by the average value algorithm, and controls the brightness distribution information of the OSD region not to participate in the operation of the local dimming control signal, so that the output is partially
  • the dimming control signal only dynamically dims the local area, the OSD dimming control signal performs non-dynamic dimming on the OSD area, or controls the backlight brightness of the OSD area to be a fixed brightness; due to the complicated operation process, it takes a large memory, when When the OSD area and the local area are separately calculated, the performance requirement of the system is high.
  • the total dimming control is output according to the brightness distribution information in the acquired image signal.
  • the signal that is, only one operation is needed for one brightness distribution information, and then the total dimming control signal is classified, and the portion corresponding to the OSD area in the total dimming control signal is used as the OSD dimming control signal, and the total dimming control signal is used.
  • the control signal performs backlight brightness adjustment on the local area, and adjusts the backlight brightness of the OSD area according to the OSD dimming control signal, or controls the OSD area not to perform backlight brightness adjustment, and only needs to perform an operation to obtain the OSD dimming control signal and Local dimming control signal, fast calculation speed and high efficiency.
  • the total dimming control signal is output according to the brightness distribution information in the image signal, and then the total dimming control signal is divided into an OSD dimming control signal and a local dimming control signal according to the OSD position information, and only one operation is needed.
  • the OSD dimming control signal and the local dimming control signal are obtained, and the operation speed is fast and the efficiency is high.
  • the invention further provides a display backlight brightness adjustment device.
  • FIG. 6 is a schematic diagram of functional modules of a first embodiment of a display backlight brightness adjusting device according to the present invention.
  • the display backlight brightness adjustment device comprises: an acquisition module 10, an output module 20, and an adjustment module 30.
  • the acquiring module 10 is configured to acquire brightness distribution information and OSD position information in an image signal
  • Liquid crystal displays have long life, power saving, low operating voltage, high color rendering index, low temperature operation, fast response, and environmental protection. Therefore, liquid crystal displays have been widely used in various electronic devices (for example, LCD TVs). Or computer).
  • the display of the liquid crystal display is a passive light-emitting device that cannot emit light by itself, so a backlight must be provided to uniformly illuminate the entire display from the rear surface.
  • the brightness of the picture is determined by the twist angle of the liquid crystal controlled by the image signal voltage and the brightness of the backlight.
  • Partial backlight adjustment is to display a dark area on the screen, control the backlight corresponding to the area to weaken or "extinguished", in the area where the screen is bright, control the backlight corresponding to the area "enhanced", thereby reducing the screen leakage to contrast
  • the effect is to improve the contrast of the displayed image to achieve the purpose of enhancing the image quality.
  • Adjust the menu through the screen can adjust the display characteristics of the display, such as color temperature, brightness, contrast and phase, and different types of OSD may be different in size and position of the display; in order to make the brightness of the display backlight reasonable Adjusting, when acquiring the brightness distribution information in the image signal, the OSD position information is also acquired, so that the OSD area and the area outside the OSD area can be adaptively adjusted to meet the change of the backlight brightness in different image areas in the display screen. Demand.
  • OSD On Screen Display
  • the output module 20 is configured to determine a local area other than the OSD area and the OSD area according to the OSD position information, and output a local dimming control signal according to the brightness distribution information and the OSD position information;
  • the liquid crystal pixels in the display screen are composed of pixel arrays. Therefore, the pixels in the display screen can be numbered.
  • the OSD position information is acquired, the OSD area and the area outside the OSD area in the display screen are determined according to the OSD position information. And the area outside the OSD area is used as the local area; the brightness distribution information in the acquired image signal includes the brightness distribution information in the video signal and the OSD signal, and the brightness of the OSD signal is usually constant, and the OSD area is The area where the OSD image overlaps with the video image.
  • the backlight brightness of the display screen is adjusted according to the video signal and the OSD signal, the backlight brightness of the OSD area changes continuously, causing intermittent flickering and partial color cast of the OSD area. Therefore, when the dimming control signal is output according to the brightness distribution information, the OSD position information is combined to prevent the dimming control signal from performing dynamic backlight brightness adjustment on the OSD area.
  • FIG. 7 is a schematic diagram of a refinement function module of an embodiment of the output module 20 of FIG. 6.
  • the output module 20 includes:
  • the extracting unit 21 is configured to extract brightness distribution information corresponding to the local area, and use the brightness distribution information as local brightness distribution information;
  • the output unit 22 is configured to output a local dimming control signal according to the local brightness distribution information.
  • the brightness distribution information of the OSD area does not participate in the operation of the dimming control signal when calculating the dimming control signal; according to an embodiment of the present invention, according to the OSD position information, The brightness distribution information is divided into brightness distribution information corresponding to the OSD area and brightness distribution information corresponding to the local area, that is, OSD brightness distribution information and local brightness distribution information, and the local dimming control signal is output according to the local brightness distribution information; for example, display
  • the image area in the screen is 1920 ⁇ 1080, and the OSD area is 640 ⁇ 108.
  • the brightness distribution information in the 640 ⁇ 108 OSD area is excluded, and the local tone is output according to the brightness distribution information of the local area of the non-OSD area. Light control signal.
  • the output unit 22 is also used to pass Local
  • the Dimming algorithm calculates and outputs a local dimming control signal corresponding to the local luminance distribution information.
  • FIG. 3 is a schematic diagram of a direct-down Local Dimming principle and a backlight partition; due to TFT LCD (Thin Film Transistor Liquid Crystal Display, the pixel itself is not illuminated, it is just a light valve, ie TFT The light and color of the LCD display are represented by the backlight and the color filter on the back; Local Dimming technology first partitions the LED backlight, as shown in Figure 3, 5 ⁇ 8, that is, 40 partitions, the LED brightness of these 40 partitions can be controlled independently and separately. Correspondingly, the liquid crystal pixels are also divided into 40 partitions.
  • TFT LCD Thin Film Transistor Liquid Crystal Display
  • FHD Full Definition (Full HD) screen
  • these 40 partitions each containing 240 ⁇ 216 pixels.
  • Local The Dimming algorithm performs real-time analysis on the grayscale of the pixels in the 40 240 ⁇ 216 partitions, and the LEDs in the LED backlight partition behind it, and performs real-time brightness adjustment based on the results of the pixel analysis.
  • the Dimming algorithm calculates and outputs a local dimming control signal corresponding to the local luminance distribution information. Since the number of pixels in the display screen is much larger than the number of LEDs, for example, the pixels of the display screen are from 1920 ⁇ 1080 to 4096 ⁇ 2160.
  • the number of LEDs is only 288 or 512, etc., therefore, when performing backlight brightness adjustment.
  • Each LED adjusts the brightness of a plurality of pixels. Therefore, the more LEDs, the more partitions in the LED backlight, the higher the accuracy of the backlight brightness adjustment, and the better the effect.
  • the adjustment module 30 is configured to perform backlight brightness adjustment on a local area according to the local dimming control signal.
  • the local dimming control signal output according to the brightness distribution information of the local area is used for backlight brightness adjustment of the local area, and the OSD area is controlled not to perform backlight brightness adjustment; for example, the image area in the display screen is 1920 ⁇ 1080 pixels, wherein the OSD The area is 640 ⁇ 108 pixels, and the part of the image area that does not include the OSD area is used as the local area, and the local dimming control signal is used to adjust the backlight brightness of the local area.
  • the backlight brightness of the OSD area does not change, and only the local area performs dynamic backlight brightness adjustment in real time, so that the OSD area of the display screen is normal, the local area VIDEO picture is stable, and the overall quality of the displayed image is improved.
  • the OSD area in the image signal is distinguished, and when the backlight brightness is adjusted, the backlight brightness is adjusted to a local area other than the OSD, so that the VIDEO picture of the OSD area of the picture and the local area of the non-OSD area is stable, and Improve the overall picture quality of the image.
  • the acquiring module 10 is further configured to acquire OSD brightness distribution information corresponding to the OSD signal;
  • the output module 20 is further configured to calculate and output an OSD dimming control signal corresponding to the OSD brightness distribution information by using an average value algorithm;
  • the adjustment module 30 is further configured to adjust a backlight brightness of the OSD region according to the OSD dimming control signal.
  • the OSD area is an overlay display of the video image and the OSD image (and the OSD image is on the upper layer of the video image), and the OSD signal corresponding to the OSD image is often a peak white signal, which is characterized by being constant throughout the multi-frame, the pair of pixels
  • the brightness distribution statistics have a large influence, affecting the analysis of the image pixel brightness in the OSD area, and since the OSD image whose OSD signal does not change is displayed on the upper layer, correspondingly, the backlight brightness adjustment may not be performed on the OSD area, but outside the OSD area.
  • the local area uses a dynamic dimming signal, applying Local The Dimming algorithm outputs a local dimming control signal. When performing pixel analysis statistics, the pixels of the OSD area are eliminated.
  • the deviation of the peak white signal of the OSD region from the image signal statistics is avoided.
  • the OSD brightness distribution information corresponding to the OSD signal is obtained, and the value of the OSD dimming control signal is output according to the average value algorithm.
  • the value is a fixed value, which is only related to the OSD brightness distribution information, and does not follow the brightness distribution of the video image signal.
  • the change is changed, that is, the backlight brightness is fixed brightness.
  • the OSD dimming control signal can also be a preset fixed value, for example, the backlight of the OSD area is fully bright. In this way, the dynamic dimming signal generated by the change of the video signal in the OSD area is avoided, and the brightness of the backlight is changed, so that the brightness of the OSD area changes with the brightness distribution of the image content, causing flicker and color cast.
  • the backlight brightness of the OSD area is adjusted, and the backlight brightness of the OSD area is fixed brightness, which is not dynamically adjusted, and the image quality stability of the OSD area is improved.
  • the output module 20 is further configured to output a total dimming control signal according to the brightness distribution information in the acquired image signal.
  • a portion of the total dimming control signal corresponding to the OSD region is used as an OSD dimming control signal
  • the adjustment module 30 is further configured to perform backlight brightness adjustment on a local area according to the local dimming control signal, and adjust a backlight brightness of the OSD area according to the OSD dimming control signal.
  • the OSD dimming control signal and the local dimming control signal are respectively obtained by dividing the luminance distribution information in the image signal into blocks, that is, by Local.
  • the Dimming operation calculates the OSD dimming control signal corresponding to the OSD region and calculates the local dimming control signal corresponding to the local region by the average value algorithm, and controls the brightness distribution information of the OSD region not to participate in the operation of the local dimming control signal, so that the output is partially
  • the dimming control signal only dynamically dims the local area, the OSD dimming control signal performs non-dynamic dimming on the OSD area, or controls the backlight brightness of the OSD area to be a fixed brightness; due to the complicated operation process, it takes a large memory, when When the OSD area and the local area are separately calculated, the performance requirement of the system is high.
  • the total dimming control is output according to the brightness distribution information in the acquired image signal.
  • the signal that is, only one operation is needed for one brightness distribution information, and then the total dimming control signal is classified, and the portion corresponding to the OSD area in the total dimming control signal is used as the OSD dimming control signal, and the total dimming control signal is used.
  • the control signal performs backlight brightness adjustment on the local area, and adjusts the backlight brightness of the OSD area according to the OSD dimming control signal, or controls the OSD area not to perform backlight brightness adjustment, and only needs to perform an operation to obtain the OSD dimming control signal and Local dimming control signal, fast calculation speed and high efficiency.
  • the total dimming control signal is output according to the brightness distribution information in the image signal, and then the total dimming control signal is divided into an OSD dimming control signal and a local dimming control signal according to the OSD position information, and only one operation is needed.
  • the OSD dimming control signal and the local dimming control signal are obtained, and the operation speed is fast and the efficiency is high.

Abstract

L'invention concerne un procédé de réglage de luminosité de rétroéclairage d'un écran d'affichage et un appareil de réglage de luminosité de rétroéclairage d'un écran d'affichage. Ledit procédé de réglage de luminosité de rétroéclairage d'un écran d'affichage comprend les étapes consistant : à obtenir des informations de distribution de luminosité et des informations de localisation OSD dans un signal d'image (S10); à déterminer, en fonction des informations de localisation OSD, une zone OSD et une zone locale, à l'extérieur de la zone OSD et à délivrer, en fonction des informations de distribution de luminosité et des informations de localisation OSD, un signal de commande de gradation locale (S20); et à effectuer, selon le signal de commande de gradation locale, un réglage de luminosité de rétroéclairage sur la zone locale (S30). Ledit procédé de réglage de luminosité de rétroéclairage d'un écran d'affichage et ledit appareil de réglage de luminosité de rétroéclairage d'un écran d'affichage distinguent une zone OSD dans un signal d'image; et, lorsque la luminosité de rétroéclairage est réglée, une zone locale, à l'extérieur de l'OSD, est soumise à un réglage de luminosité de rétroéclairage, de manière à stabiliser la zone OSD d'une image et d'une image vidéo d'une zone locale d'une zone non OSD et à améliorer la qualité d'image globale d'une image.
PCT/CN2016/112702 2016-09-28 2016-12-28 Procédé et appareil de réglage de luminosité de rétroéclairage d'un écran d'affichage WO2018058831A1 (fr)

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CN111818284B (zh) * 2020-07-08 2022-11-29 康佳集团股份有限公司 一种超高清电视区域调光系统及方法

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