WO2020062665A1 - 显示装置的亮度控制方法、装置及液晶显示器 - Google Patents

显示装置的亮度控制方法、装置及液晶显示器 Download PDF

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Publication number
WO2020062665A1
WO2020062665A1 PCT/CN2018/123450 CN2018123450W WO2020062665A1 WO 2020062665 A1 WO2020062665 A1 WO 2020062665A1 CN 2018123450 W CN2018123450 W CN 2018123450W WO 2020062665 A1 WO2020062665 A1 WO 2020062665A1
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Prior art keywords
saturation
dimming signal
signal
controller
area
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PCT/CN2018/123450
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English (en)
French (fr)
Inventor
陈伟
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HKC Co Ltd
Chongqing HKC Optoelectronics Technology Co Ltd
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HKC Co Ltd
Chongqing HKC Optoelectronics Technology Co Ltd
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Priority to US17/043,189 priority Critical patent/US11087702B2/en
Publication of WO2020062665A1 publication Critical patent/WO2020062665A1/zh
Anticipated expiration legal-status Critical
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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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0814—Several active elements per pixel in active matrix panels used for selection purposes, e.g. logical AND for partial update
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • 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
    • G09G2320/0242—Compensation of deficiencies in the appearance 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0613—The adjustment depending on the type of the information to be displayed
    • G09G2320/062—Adjustment of illumination source parameters
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • 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
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G09G3/3607—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 by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels

Definitions

  • the present application relates to the technical field of display panels, and in particular, to a brightness control method and device for a display device, and a liquid crystal display.
  • RGBW technology is a new technology recently developed in the field of display technology. Compared with RGB display technology, RGBW display technology has lower power consumption. As people's awareness of energy saving and emission reduction has gradually increased, the advantages of RGBW technology have become increasingly apparent.
  • the RGBW algorithm adds white pixels "W" to the original RGB, so the aperture ratio of the solid color becomes 75% of the original, that is, compared to the traditional RGBW panel, the brightness of the RGBW panel is darker in the solid color screen. As a result, the screen appears darker.
  • the main purpose of this application is to provide a brightness control method of a display device, which aims to enhance the brightness of a four-color display panel when displaying a solid-color picture.
  • the brightness control method for a display device includes a display panel, a controller, a driving circuit, and a backlight unit; the brightness control method includes the following steps:
  • the controller receives a video signal, and obtains a saturation signal and an area dimming signal of each partition screen of the display panel;
  • the controller calculates a saturation dimming signal of each partition picture according to the saturation signal.
  • the controller controls the driving circuit to adjust the brightness of the light-emitting component in the backlight unit according to the area dimming signal and the saturation dimming signal to adjust the backlight brightness of the corresponding area of the display panel.
  • controller calculates the saturation dimming signal of each partition picture according to the saturation signal includes:
  • the controller uses the following formula to calculate the saturation dimming signal according to the saturation signal:
  • d is a saturation dimming signal
  • a is a current gain adjustment parameter
  • s is a saturation signal
  • controller calculates the saturation dimming signal of each partition picture according to the saturation signal includes:
  • the controller uses the following formula to calculate the saturation dimming signal according to the saturation signal:
  • d is a saturation dimming signal
  • s is a saturation signal
  • the controller adjusts the brightness of the light-emitting component through a driving circuit according to the area dimming signal and the saturation dimming signal to adjust the backlight brightness of the corresponding area of the display panel.
  • the duty cycle of the light emitting components in the corresponding area of the display panel is adjusted according to the product of the area dimming signal and the weight coefficient and the sum of the product of the saturation dimming signal and the weight coefficient to adjust the backlight brightness.
  • the sum of the weight coefficient of the area dimming signal and the weight coefficient of the saturation dimming signal is 1.
  • the present application also proposes a display device including a display panel, a controller, a driving circuit, and a backlight unit, wherein the backlight unit includes a light emitting component, wherein
  • the controller receives a video signal, and obtains a saturation signal and an area dimming signal of each partition picture of the display panel;
  • the controller calculating a saturation dimming signal of each partition picture according to the saturation signal
  • the controller adjusts the duty cycle of the light-emitting components of the corresponding area of the display panel according to the area dimming signal and the saturation dimming signal to adjust the brightness of the backlight.
  • the controller uses the following formula to calculate the saturation dimming signal:
  • d is a saturation dimming signal
  • a is a current gain adjustment parameter
  • s is a saturation signal
  • the calculation module uses the following formula to calculate the saturation dimming signal:
  • d is a saturation dimming signal
  • s is a saturation signal
  • the backlight adjustment module Give the area dimming signal and the saturation dimming signal weight coefficients separately; adjust the display according to the product of the area dimming signal and the weight coefficient and the sum of the product of the saturation dimming signal and the weight coefficient The duty cycle of the light emitting components in the corresponding area of the panel to adjust the backlight brightness.
  • the sum of the weight coefficient of the area dimming signal and the weight coefficient of the saturation dimming signal is 1.
  • the present application also proposes a liquid crystal display.
  • the liquid crystal display includes a display panel, a controller, a driving circuit, and a backlight unit.
  • the backlight unit includes a light emitting component.
  • a controller configured to receive a video signal and obtain a saturation signal and an area dimming signal of each partition screen of the display panel;
  • the controller performs a logical addition operation on the area dimming signal and the saturation dimming signal, and then outputs the result to a driving circuit.
  • the driving circuit adjusts the brightness of the middle-light emitting component to adjust the backlight brightness of the corresponding area of the display panel. .
  • the technical solution of the present application obtains the saturation signal and the area dimming signal of each partition screen of the display panel from the received video signal, and calculates the saturation dimming signal of each partition screen according to the saturation signal to make the backlight unit of the display panel
  • the dimming is jointly determined by the area dimming signal and the saturation signal, so that in a pure color picture, the brightness of the pure color can be enhanced by increasing the duty cycle of the light emitting component in the backlight unit.
  • FIG. 1 is a flowchart of an embodiment of a brightness control method for a display device of the present application
  • FIG. 2 is a schematic diagram showing a relationship between a working current and a working period of a display panel light-emitting component in the prior art
  • FIG. 3 is a schematic diagram showing a relationship between a working current and a working period of a light emitting component of a brightness control method of a display device of the present application;
  • FIG. 4 is a schematic diagram showing a relationship between a saturation dimming signal and saturation according to an embodiment of a brightness control method of a display device of the present application;
  • FIG. 5 is a functional module diagram of an embodiment of a display device of the present application.
  • the present application proposes a brightness control method for a display device.
  • the display device uses a liquid crystal display panel.
  • the display device has RGBW technology.
  • RGBW technology is to add W white sub-pixels to the original RGB three primary colors to become a four-color pixel design.
  • pixel rendering technology Consistent color performance in the new pixel arrangement.
  • the light transmittance of the LCD panel is greatly improved.
  • the brightness is greatly improved, which makes the screen hierarchy more clear and the screen more transparent. .
  • the display device includes a display panel 20, a controller 10, a driving circuit 30, and a backlight unit 40.
  • the brightness control method of the display device includes:
  • the controller 10 receives a video signal, and obtains a saturation signal and an area dimming signal of each partition screen of the display panel 20.
  • the display device has an area dimming function, so the display panel 20 has a plurality of backlight partitions corresponding to a plurality of partition screens.
  • the controller 10 analyzes the saturation signal and the area dimming signal of each partition picture from the received video signals.
  • the controller 10 calculates a saturation dimming signal of each partition picture according to the saturation signal.
  • the controller 10 brings the saturation signal into the preset formula through a preset formula, and calculates a saturation dimming signal.
  • the controller 10 adjusts the brightness of the backlight unit through the driving circuit 30 according to the area dimming signal and the saturation dimming signal to adjust the backlight brightness of the corresponding area of the display panel 20.
  • the backlight unit includes a light emitting component, and the light emitting component is an LED lamp.
  • the brightness of the backlight unit is adjusted by controlling the duty ratio of the LED lights.
  • the duty cycle is the percentage of time that the circuit is switched on in the entire circuit duty cycle. For example, if a circuit is turned on half the time during a working cycle, its duty cycle is 50%. If the signal voltage applied to the working element is 5V, the actual average working voltage or effective voltage value is 2.5V. Assume that the element is an electronic valve. When the circuit is fully closed, the valve is fully open; when the duty cycle is 50%, the valve state is half open. Similarly, when the duty cycle is set to 20%, the valve opening degree should obviously be 20%. In this way, the valve can be arbitrarily adjusted from 0% (fully closed) to 100% (fully open). In this embodiment, the controller 10 outputs a PWM control signal to the driving circuit, and controls the duty cycle of the PWM control signal to adjust the effective value of the actual working voltage of the backlight assembly, thereby adjusting the brightness of the backlight unit.
  • RGB signal is acquired after receiving a video signal, image quality enhancement processing is performed on the RGB signal, and area dimming is performed according to the RGB signal.
  • image quality enhancement processing is performed on the RGB signal
  • area dimming is performed according to the RGB signal.
  • Optional conversion of RGB signals to RGBW signals, that is, W (white light) signals are added to the RGB signals, which are over-driven (over drive) is input to the display panel 20 after processing.
  • the duty cycle of the light-emitting components of the display panel 20 is controlled together.
  • the area dimming signal and the saturation dimming signal are logically added together, and the obtained result is output to the driving board of the light-emitting component of the display panel 20.
  • the technical solution of the present application obtains the saturation signal and the area dimming signal of each partition screen of the display panel 20 from the received video signal, and calculates the saturation dimming signal of each partition screen according to the saturation signal to make the display panel 20 emit light.
  • the duty cycle dimming of the component is determined by the area dimming signal and the saturation signal together, so that the pure color screen can be enhanced by increasing the duty cycle of the light emitting component to enhance the solid color brightness.
  • controller 10 calculates the saturation dimming signal of each partition picture according to the saturation signal” includes:
  • d is a saturation dimming signal
  • a is a current gain adjustment parameter
  • s is a saturation signal. It is easy to understand that the current gain adjustment parameter can be flexibly set according to the effect of actual adjustment.
  • controller 10 calculates the saturation dimming signal of each partition picture according to the saturation signal.
  • d is a saturation dimming signal
  • s is a saturation signal.
  • Preset formula d 1 / a + (A-1) * s / a.
  • the constant current of the light-emitting component of the display panel 20 is 20 mA (milliamps). If the ratio is 100%, the average current of the light-emitting component is 20 mA.
  • the current of the light-emitting component is first increased to 25 mA.
  • the duty ratio of the light-emitting component is adjusted to 80% when the screen is white, the average current is also 20 mA.
  • the saturation when the saturation is 0 (white picture), the overall brightness is unchanged; when the saturation is 1 (that is, a solid picture), the overall brightness can be increased by 25%.
  • the controller 10 adjusts the brightness of the light-emitting component through the driving circuit 30 according to the area dimming signal and the saturation dimming signal to adjust the backlight brightness of the corresponding area of the display panel 20" includes :
  • the duty cycle of the light emitting components in the corresponding area of the display panel 20 is adjusted according to the product of the area dimming signal and the weight coefficient and the sum of the product of the saturation dimming signal and the weight coefficient to adjust the backlight brightness.
  • the sum of the weight coefficient of the area dimming signal and the weight coefficient of the saturation dimming signal is 1.
  • weight coefficient of the area dimming signal and the weight coefficient of the saturation dimming signal can be appropriately adjusted according to the actual needs.
  • the weight coefficient reflects the adjustment of The respective proportions of the duty cycle.
  • the present application also proposes a display device including a display panel 20, a controller 10, a driving circuit 30, and a backlight unit 40, wherein the backlight unit 40 includes a light emitting component.
  • the driving circuit 30 is connected to the controller 10 and the backlight unit 40 is connected to the driving circuit 30, wherein:
  • the controller 10 is configured to receive a video signal, and obtain a saturation signal and an area dimming signal of each partition screen of the display panel 20;
  • the controller 10 calculates a saturation dimming signal of each partition picture according to the saturation signal
  • the controller 10 adjusts the brightness of the light-emitting component through the driving circuit 30 according to the area dimming signal and the saturation dimming signal to adjust the backlight brightness of the corresponding area of the display panel 20.
  • the display device has an area dimming function, so the display panel 20 has a plurality of backlight partitions corresponding to a plurality of partition screens.
  • the controller 10 analyzes the saturation signal and the area dimming signal of each partition picture from the received video signals.
  • controller 10 uses the following formula to calculate the saturation dimming signal:
  • d is a saturation dimming signal
  • a is a current gain adjustment parameter
  • s is a saturation signal
  • the controller 10 uses the following formula to calculate the saturation dimming signal:
  • d is a saturation dimming signal
  • s is a saturation signal
  • the controller 10 assigns the area dimming signal and the saturation dimming signal weight coefficients respectively; according to a product of the area dimming signal and the weight coefficient, and the saturation dimming signal and The sum of the products of the weight coefficients is used to adjust the duty cycle of the light emitting components in the corresponding area of the display panel 20 to adjust the backlight brightness.
  • the saturation when the saturation is 0 (white picture), the overall brightness is unchanged; when the saturation is 1 (that is, a solid picture), the overall brightness can be increased by 25%. While reducing the power consumption of the display, the brightness of the solid-color picture is improved, and the display effect is improved.
  • the present application also proposes a liquid crystal display.
  • the liquid crystal display includes a display panel, a controller, a driving circuit, and a backlight unit.
  • the backlight unit includes a light emitting component.
  • a controller configured to receive a video signal and obtain a saturation signal and a region dimming signal of each partition screen of the display panel; the controller calculates and obtain a saturation dimming signal of each partition screen according to the saturation signal;
  • the area dimming signal and the saturation dimming signal are logically added and output to a driving circuit, and the brightness of the middle light emitting component is adjusted by the driving circuit to adjust the backlight brightness of the corresponding area of the display panel.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
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Abstract

一种显示装置的亮度控制方法、装置及液晶显示器，其中显示装置的亮度控制方法通过获取显示面板各个分区画面的饱和度信号及区域调光信号（S100），根据饱和度信号计算得到各个分区画面的饱和度调光信号（S200），以调节背光亮度。

Description

显示装置的亮度控制方法、装置及液晶显示器
相关申请
本申请要求2018年9月26日申请的，申请号为201811129036.4，名称为“显示装置的亮度控制方法及装置”中国专利申请的优先权，再次将其全文引入作为参考。
技术领域
本申请涉及显示面板技术领域，特别涉及显示装置的亮度控制方法、装置及液晶显示器。
背景技术
RGBW技术是显示技术领域最近发展的新技术，相对RGB显示技术，RGBW显示技术功耗较低，随着人们节能减排的意识逐步增强，RGBW技术的节能优势日益显现。
这是因为RGBW算法在原来RGB的基础上增加了白色像素“W”，故纯色的开口率变为原来的75%，即，相比较传统的RGBW面板，纯色画面下RGBW面板的亮度偏暗，导致画面呈现的亮度较暗。
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。
申请内容
本申请的主要目的是提供一种显示装置的亮度控制方法，旨在增强四色显示面板在显示纯色画面时的亮度。
为实现上述目的，本申请提出的显示装置的亮度控制方法，所述显示装置包括显示面板、控制器、驱动电路以及背光单元；所述亮度控制方法包括以下步骤：
所述控制器接收视频信号，获取显示面板各个分区画面的饱和度信号及区域调光信号；
所述控制器根据饱和度信号计算得到各个分区画面的饱和度调光信号；以及
所述控制器根据所述区域调光信号及所述饱和度调光信号，控制驱动电路调节背光单元中发光组件的亮度，以调节显示面板相应区域的背光亮度。
可选地，所述“控制器根据饱和度信号计算得到各个分区画面的饱和度调光信号”包括：
控制器根据饱和度信号采用如下公式来计算该饱和度调光信号：
d=1/a +（a-1）*s/a；
其中，d为饱和度调光信号，a为电流增益调整参数，s为饱和度信号。
可选地，所述“控制器根据饱和度信号计算得到各个分区画面的饱和度调光信号”包括：
控制器根据饱和度信号采用如下公式来计算该饱和度调光信号：
d=0.8+0.2s；
其中，d为饱和度调光信号，s为饱和度信号。
可选地，所述“所述控制器根据所述区域调光信号及所述饱和度调光信号，通过驱动电路调节发光组件的亮度，以调节显示面板相应区域背光亮度”包括：
分别赋予所述区域调光信号和所述饱和度调光信号权重系数；
根据所述区域调光信号和权重系数的乘积、及所述饱和度调光信号和权重系数的乘积之和来调节显示面板相应区域发光组件的占空比，以调节背光亮度。
可选地，所述区域调光信号的权重系数与所述饱和度调光信号的权重系数之和为1。
本申请还提出一种显示装置，包括：显示面板、控制器、驱动电路以及背光单元，其中，所述背光单元包括发光组件，其中
所述控制器：接收视频信号，获取显示面板各个分区画面的饱和度信号及区域调光信号；
所述控制器：根据饱和度信号计算得到各个分区画面的饱和度调光信号；以及
所述控制器：根据所述区域调光信号及所述饱和度调光信号调节显示面板相应区域发光组件的占空比，以调节背光亮度。
可选地，所述控制器采用如下公式来计算该饱和度调光信号：
d=1/a +（a-1）*s/a；
其中，d为饱和度调光信号，a为电流增益调整参数，s为饱和度信号。
可选地，所述计算模块采用如下公式来计算该饱和度调光信号：
d=0.8+0.2s；
其中，d为饱和度调光信号，s为饱和度信号。
可选地，所述背光调节模块 分别赋予所述区域调光信号和所述饱和度调光信号权重系数；根据所述区域调光信号和权重系数的乘积、及所述饱和度调光信号和权重系数的乘积之和来调节显示面板相应区域发光组件的占空比，以调节背光亮度。
可选地，所述区域调光信号的权重系数与所述饱和度调光信号的权重系数之和为1。
本申请还提出一种的液晶显示器，所述液晶显示器包括显示面板、控制器、驱动电路以及背光单元，其中，所述背光单元包括发光组件，其中
控制器，设置为接收视频信号，获取显示面板各个分区画面的饱和度信号及区域调光信号；
所述控制器根据饱和度信号计算得到各个分区画面的饱和度调光信号；
所述控制器对所述区域调光信号及所述饱和度调光信号进行逻辑加运算，再输出至驱动电路，通过所述驱动电路调节中发光组件的亮度，以调节显示面板相应区域背光亮度。
本申请技术方案通过从接收的视频信号中获取显示面板各个分区画面的饱和度信号及区域调光信号，依据饱和度信号计算得到各个分区画面的饱和度调光信号，使得显示面板的背光单元的调光由区域调光信号及饱和度信号共同决定，从而可在纯色画面依靠提高背光单元中发光组件的占空比来增强纯色亮度。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。
图1为本申请显示装置的亮度控制方法一实施例的流程图；
图2为现有技术中显示面板发光组件工作电流与工作周期关系的示意图；
图3为本申请显示装置的亮度控制方法的发光组件工作电流与工作周期关系的示意图；
图4为本申请显示装置的亮度控制方法一实施例饱和度调光信号与饱和度的关系的示意图；
图5为本申请显示装置一实施例的功能模块图。
本申请目的的实现、功能特点及优点将结合实施例，参照附图做可选说明。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明，本申请实施例中所有方向性指示（诸如上、下、左、右、前、后……）仅设置为解释在某一特定姿态（如附图所示）下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，在本申请中涉及“第一”、“第二”等的描述仅设置为描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本申请要求的保护范围之内。
本申请提出一种显示装置的亮度控制方法。本实施例中，即该显示装置采用液晶显示面板。本实施例中，该显示装置具有RGBW技术。RGBW技术就是在原有的RGB三原色上增加了W白色子像素，成为四色型像素设计，是sub pixel rendering技术方式。 在新的像素排布方式下色彩表现的一致性。同时大幅度提升了液晶面板的透光率，在显示相同亮度的画面时，其耗电量更低;而相同功耗的情况下，亮度大幅提高，这使得画面层次更加分明，画面更通透。
参照图1及图5，在本申请实施例中，所述显示装置包括显示面板20、控制器10、驱动电路30以及背光单元40；该显示装置的亮度控制方法包括：
S100、所述控制器10接收视频信号，获取显示面板20各个分区画面的饱和度信号及区域调光信号。
需要说明的是，该显示装置时具有区域调光功能，因此显示面板20对应的具有多个背光分区，对应多个分区画面。控制器10从接受的视频信号中解析出各个分区画面的饱和度信号及区域调光信号。
S200、所述控制器10根据饱和度信号计算得到各个分区画面的饱和度调光信号。控制器10通过预设公式，将饱和度信号带入预设公式中，计算得到饱和度调光信号。
S300、所述控制器10根据所述区域调光信号及所述饱和度调光信号，通过驱动电路30调节背光单元的亮度，以调节显示面板20相应区域的背光亮度。易于理解的是，该背光单元中包括有发光组件，该发光组件为LED灯。通过控制LED灯的占空比来调节背光单元的亮度。
占空比是指电路被接通的时间占整个电路工作周期的百分比。比如说，一个电路在它一个工作周期中有一半时间被接通了，那么它的占空比就是50%。如果加在该工作元件上的信号电压为5V，则实际的工作电压平均值或电压有效值就是2.5V。假设该元件为一个电子阀门，当电路全时接通时，阀门全开；当占空比为50%时，阀门状态为半开。同理，当占空比设置为20%时，阀门的开度显然应该为20%。这样，这个阀门就可以在0%(全闭)到100%（全开）的范围内任意调节。本实施例中，控制器10输出PWM控制信号至所述驱动电路，通过控制PWM控制信号的占空比，来调节背光组件实际工作电压的有效值，从而调节背光单元的亮度。
需要说明的是，通常在接收视频信号后获取到RGB信号，对RGB信号进行画质增强处理，根据RGB信号进行区域调光。可选将RGB信号转换为RGBW信号，即在RGB信号中增加了W（白光）信号，经过过驱动（over drive）处理后输入至显示面板20。
通过将区域调光信号及饱和度调光信号结合起来，共同控制显示面板20的发光组件的占空比外。本申请实施例中，具体是通过将区域调光信号与饱和度调光信号进行逻辑加运算，将得到的结果在输出至显示面板20发光组件的驱动板。
本申请技术方案通过从接收的视频信号中获取显示面板20各个分区画面的饱和度信号及区域调光信号，依据饱和度信号计算得到各个分区画面的饱和度调光信号，使得显示面板20的发光组件的占空比调光由区域调光信号及饱和度信号共同决定，从而可在纯色画面依靠提高发光组件的占空比来增强纯色亮度的。
具体地，所述“控制器10根据饱和度信号计算得到各个分区画面的饱和度调光信号”包括：
采用如下公式来计算该饱和度调光信号：
d=1/a +（a-1）*s/a；
其中，d为饱和度调光信号，a为电流增益调整参数，s为饱和度信号。易于理解的是，电流增益调整参数可根据实际调整的效果而灵活设定。
在本实施例中，所述“控制器10根据饱和度信号计算得到各个分区画面的饱和度调光信号”包括：
采用如下公式来计算该饱和度调光信号：
d=0.8+0.2s；
其中，d为饱和度调光信号，s为饱和度信号。预设公式d=1/a +（a-1）*s/a，在本实施例中，取a=1.25，得到一具体的计算公式为 d=0.8+0.2s。
需要说明的是，参照图2，假设在不用饱和度调光信号进行调光的情况下，显示面板20的发光组件的恒定电流为20mA（毫安），在白画面下，发光组件的占空比为100%，则发光组件平均电流为20mA。
参照图3及图4，本实施例中则首先将发光组件的电流提高到25mA，白画面时发光组件的占空比调整为80%，则平均电流也是20mA。在发光组件电流为25mA、占空比为80%基础上，增加饱和度调光信号对发光组件占空比的调节，则饱和度调光信号与饱和度的函数关系为: d=0.8+0.2s。
通过此方法，当饱和度为0时（白画面），整体亮度不变；当饱和度为1时（即纯色画面），可将整体的亮度提升25%。
通过增加色彩饱和度调光方式（Saturation dimming），依据统计显示面板20各个小分区色彩饱和度来调节背光输出占空比，彻底解决应用RGBW技术之面板纯色亮度不足的问题。
本实施例中，所述“所述控制器10根据所述区域调光信号及所述饱和度调光信号，通过驱动电路30调节发光组件的亮度，以调节显示面板20相应区域背光亮度”包括：
分别赋予所述区域调光信号和所述饱和度调光信号权重系数；
根据所述区域调光信号和权重系数的乘积、及所述饱和度调光信号和权重系数的乘积之和来调节显示面板20相应区域发光组件的占空比，以调节背光亮度。
可选地，所述区域调光信号的权重系数与所述饱和度调光信号的权重系数之和为1。
需要说明的是，可根据实际需求，适当调整区域调光信号的权重系数及饱和度调光信号权重系数，权重系数体现了区域调光信号和饱和度调光信号在调节显示面板20发光组件的占空比所占的各自比重。
参照图5，基于上述显示装置的亮度控制方法，本申请还提出一种显示装置，包括显示面板20、控制器10、驱动电路30以及背光单元40，其中，所述背光单元40包括发光组件。需要说明的是，驱动电路30与控制器10连接，背光单元40与所述驱动电路30连接，其中：
所述控制器10，设置为接收视频信号，获取显示面板20各个分区画面的饱和度信号及区域调光信号；
所述控制器10根据饱和度信号计算得到各个分区画面的饱和度调光信号；
所述控制器10根据所述区域调光信号及所述饱和度调光信号，通过驱动电路30调节发光组件的亮度，以调节显示面板20相应区域背光亮度。
本实施例中，显示装置时具有区域调光功能，因此显示面板20对应的具有多个背光分区，对应多个分区画面。控制器10从接受的视频信号中解析出各个分区画面的饱和度信号及区域调光信号。
可选地，所述控制器10采用如下公式来计算该饱和度调光信号：
d=1/a +（a-1）*s/a；
其中，d为饱和度调光信号，a为电流增益调整参数，s为饱和度信号。
本实施例中，在取a为1.25，所述控制器10采用如下公式来计算该饱和度调光信号：
d=0.8+0.2s；
其中，d为饱和度调光信号，s为饱和度信号。在a=1.25时，得到的计算公式d=0.8+0.2s，利用该公式计算到的饱和度调光信号取得比较理想的调光效果。
可选地，所述控制器10分别赋予所述区域调光信号和所述饱和度调光信号权重系数；根据所述区域调光信号和权重系数的乘积、及所述饱和度调光信号和权重系数的乘积之和来调节显示面板20相应区域发光组件的占空比，以调节背光亮度。
需要说明的是，所述区域调光信号的权重系数与所述饱和度调光信号的权重系数之和为1。
采用本申请技术方案，能够使得RGBW技术中，当饱和度为0时（白画面），整体亮度不变；当饱和度为1时（即纯色画面），可将整体的亮度提升25%。使得显示器功耗降低的同时，提高纯色画面的亮度，提升了显示效果。
本申请还提出一种的液晶显示器，所述液晶显示器包括显示面板、控制器、驱动电路以及背光单元，其中，所述背光单元包括发光组件，其中
控制器，设置为接收视频信号，获取显示面板各个分区画面的饱和度信号及区域调光信号；所述控制器根据饱和度信号计算得到各个分区画面的饱和度调光信号；所述控制器对所述区域调光信号及所述饱和度调光信号进行逻辑加运算，再输出至驱动电路，通过所述驱动电路调节中发光组件的亮度，以调节显示面板相应区域背光亮度。
以上所述仅为本申请的可选实施例，并非因此限制本申请的专利范围，凡是在本申请的构思下，利用本申请说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本申请的专利保护范围内。

Claims (18)

  1. 一种显示装置的亮度控制方法，其中，所述显示装置包括显示面板、控制器、驱动电路以及背光单元发光组件；
    所述亮度控制方法包括以下步骤：
    所述控制器接收视频信号，获取显示面板各个分区画面的饱和度信号及区域调光信号；
    所述控制器根据饱和度信号计算得到显示面板各个分区画面的饱和度调光信号；以及
    所述控制器根据所述区域调光信号及所述饱和度调光信号，控制驱动电路调节背光单元中发光组件的亮度，以调节显示面板相应区域的背光亮度。
  2. 如权利要求1所述的显示装置的亮度控制方法，其中，所述“控制器根据饱和度信号计算得到各个分区画面的饱和度调光信号”包括：
    控制器根据饱和度信号采用如下公式计算该饱和度调光信号：
    d=1/a +（a-1）*s/a；
    其中，d为饱和度调光信号，a为电流增益调整参数，s为饱和度信号。
  3. 如权利要求1所述的显示装置的亮度控制方法，其中，所述“控制器根据饱和度信号计算得到各个分区画面的饱和度调光信号”包括：
    控制器根据饱和度信号采用如下公式计算该饱和度调光信号：
    d=0.8+0.2s；
    其中，d为饱和度调光信号，s为饱和度信号。
  4. 如权利要求1所述的显示装置的亮度控制方法，其中，所述“所述控制器根据所述区域调光信号及所述饱和度调光信号，通过驱动电路调节发光组件的亮度，以调节显示面板相应区域背光亮度”包括：
    分别赋予所述区域调光信号和所述饱和度调光信号权重系数；
    根据所述区域调光信号和权重系数的乘积、及所述饱和度调光信号和权重系数的乘积之和来调节显示面板相应区域发光组件的占空比，以调节背光亮度。
  5. 如权利要求4所述的显示装置的亮度控制方法，其中，
    所述区域调光信号的权重系数与所述饱和度调光信号的权重系数之和为1。
  6. 如权利要求1所述的显示装置的亮度控制方法，其中，所述显示面板包括白、红、绿及蓝四色子像素。
  7. 一种显示装置，其中，包括：
    显示面板、控制器、驱动电路以及背光单元，其中，所述背光单元包括发光组件，其中
    控制器，设置为接收视频信号，获取显示面板各个分区画面的饱和度信号及区域调光信号；
    所述控制器根据饱和度信号计算得到各个分区画面的饱和度调光信号；以及
    所述控制器根据所述区域调光信号及所述饱和度调光信号，通过驱动电路调节中发光组件的亮度，以调节显示面板相应区域背光亮度。
  8. 如权利要求7所述的显示装置，其中，所述控制器采用如下公式计算饱和度调光信号：
    d=1/a +（a-1）*s/a；
    其中，d为饱和度调光信号，a为电流增益调整参数，s为饱和度信号。
  9. 如权利要求7所述的显示装置，其中，所述控制器采用如下公式计算饱和度调光信号：
    d=0.8+0.2s；
    其中，d为饱和度调光信号，s为饱和度信号。
  10. 如权利要求7所述的显示装置，其中，所述控制器分别赋予所述区域调光信号和所述饱和度调光信号权重系数；根据所述区域调光信号和权重系数的乘积、及所述饱和度调光信号和权重系数的乘积之和来调节显示面板相应区域发光组件的占空比，以调节背光亮度。
  11. 如权利要求10所述的显示装置，其中，所述区域调光信号的权重系数与所述饱和度调光信号的权重系数之和为1。
  12. 如权利要求10所述的显示装置，其中，所述显示面板包括白、红、绿、蓝四色子像素。
  13. 一种的液晶显示器，其中，所述液晶显示器包括显示面板、控制器、驱动电路以及背光单元，其中，所述背光单元包括发光组件，其中
    控制器，设置为接收视频信号，获取显示面板各个分区画面的饱和度信号及区域调光信号；
    所述控制器根据饱和度信号计算得到各个分区画面的饱和度调光信号；以及
    所述控制器对所述区域调光信号及所述饱和度调光信号进行逻辑加运算，再输出至驱动电路，通过所述驱动电路调节中发光组件的亮度，以调节显示面板相应区域背光亮度。
  14. 如权利要求13所述的液晶显示器，其中，所述控制器采用如下公式计算饱和度调光信号：
    d=1/a +（a-1）*s/a；
    其中，d为饱和度调光信号，a为电流增益调整参数，s为饱和度信号。
  15. 如权利要求13所述的液晶显示器，其中，所述控制器采用如下公式计算饱和度调光信号：
    d=0.8+0.2s；
    其中，d为饱和度调光信号，s为饱和度信号。
  16. 如权利要求13所述的液晶显示器，其中，所述“所述控制器根据所述区域调光信号及所述饱和度调光信号，通过驱动电路调节发光组件的亮度，以调节显示面板相应区域背光亮度”包括：
    分别赋予所述区域调光信号和所述饱和度调光信号权重系数；
    根据所述区域调光信号和权重系数的乘积、及所述饱和度调光信号和权重系数的乘积之和来调节显示面板相应区域发光组件的占空比，以调节背光亮度。
  17. 如权利要求16所述的液晶显示器，其中，所述区域调光信号的权重系数与所述饱和度调光信号的权重系数之和为1。
  18. 如权利要求13所述的液晶显示器，其中，所述显示面板包括白、红、绿及蓝四色子像素。
PCT/CN2018/123450 2018-09-26 2018-12-25 显示装置的亮度控制方法、装置及液晶显示器 Ceased WO2020062665A1 (zh)

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