WO2017156800A1 - 液晶显示装置及其背光控制方法 - Google Patents

液晶显示装置及其背光控制方法 Download PDF

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WO2017156800A1
WO2017156800A1 PCT/CN2016/078255 CN2016078255W WO2017156800A1 WO 2017156800 A1 WO2017156800 A1 WO 2017156800A1 CN 2016078255 W CN2016078255 W CN 2016078255W WO 2017156800 A1 WO2017156800 A1 WO 2017156800A1
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backlight
image data
liquid crystal
module
display device
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PCT/CN2016/078255
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English (en)
French (fr)
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邹恭华
左清成
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武汉华星光电技术有限公司
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Priority to US15/100,120 priority Critical patent/US10347192B2/en
Publication of WO2017156800A1 publication Critical patent/WO2017156800A1/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
    • 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
    • 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
    • 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
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/08—Arrangements within a display terminal for setting, manually or automatically, display parameters of the display terminal
    • 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 liquid crystal display device and a backlight control method thereof.
  • CABC Content Adaptive Brightness Control
  • the CABC technology can adjust the relationship between the grayscale brightness of the image and the brightness of the screen backlight according to the image displayed on the screen, and substantially reduce the brightness of the screen backlight while substantially maintaining the display effect of the image. For example, increasing the grayscale brightness of the image by 30% makes the image brighter, and reducing the backlight brightness of the LCD screen by 30%, making the image darker, so that the brightness of the image is basically consistent before and after processing, but reduced. 30% backlight power consumption.
  • the brightness of the backlight can be controlled by the magnitude of the driving voltage.
  • a liquid crystal display device using CABC technology mainly includes an image data acquiring unit 1 , a liquid crystal panel 2 , a panel driving unit 3 , and a backlight module.
  • the image data acquiring unit 1 is for acquiring image data S RGB
  • the panel driving unit 3 drives the liquid crystal panel 2 based on the image data S RGB and generates a backlight driving signal S PWM corresponding to the image data S RGB .
  • the PWM backlight modulation unit 5 performs pulse width modulation on the backlight driving signal S PWM to form a driving power source VL to be supplied to the backlight module 4 .
  • the dimming mode of the backlight adopts a single mode of pulse width modulation of the backlight driving signal S PWM , and the PWM dimming mode has a higher conversion efficiency when the required backlight brightness is large;
  • the duty ratio of the PWM dimming mode is very low, which greatly reduces the efficiency of the backlight driving, and is not conducive to the effective utilization of the overall system energy of the liquid crystal display device.
  • the present invention provides a liquid crystal display device and a backlight control method thereof, which use the CABC technology to improve the efficiency of backlight driving as a whole by improving the backlight control structure and method.
  • a liquid crystal display device includes an image data acquiring unit, a liquid crystal panel and a panel driving unit, a backlight module, and a backlight driving unit; wherein the image data acquiring unit is configured to acquire image data; and the panel driving unit is configured according to the image Data driving the liquid crystal panel and generating a backlight driving signal corresponding to the image data; the backlight driving unit includes a pulse width modulation module and a pulse frequency modulation module, the pulse width modulation module and the pulse in one display period One of the frequency modulation modules modulates the backlight driving signal to form a driving power supply to the backlight module; the liquid crystal display device further includes a backlight modulation selecting unit for detecting and calculating an average of the image data a pixel brightness value A, the backlight modulation selection unit further sets a reference pixel brightness value A 0 ; when A ⁇ A 0 , the backlight modulation selection unit selects to turn on the pulse width modulation module; when A ⁇ A 0 The backlight modulation selection unit selects to turn on the pulse frequency modul
  • the backlight modulation selection unit includes an average pixel brightness detection module and a pixel brightness comparison module.
  • the average pixel brightness detection module is configured to detect and calculate an average pixel brightness value A of the image data, where the pixel brightness comparison module is used.
  • the reference pixel luminance value A 0 is stored, and the average pixel luminance value A and the reference pixel luminance value A 0 are compared.
  • the average pixel brightness detection module acquires the image data, and calculates an average pixel brightness value A by using a gray histogram analysis.
  • the reference pixel luminance value A 0 is 5% to 25% of the maximum pixel luminance of the image data acquired by the image data acquiring unit.
  • the panel driving unit receives image data from the image data acquiring unit, and increases grayscale brightness of the image data to drive the liquid crystal panel according to a numerical ratio; the panel driving unit causes the backlight module to follow The condition that the numerical ratio reduces the brightness of the backlight generates the backlight driving signal.
  • the numerical ratio is preset and written into the panel driving unit through a register.
  • a backlight control method of a liquid crystal display device comprising: receiving, by the panel driving unit, image data from the image data acquiring unit, generating a backlight driving signal corresponding to the image data; selecting by the backlight modulation The unit detects and calculates an average pixel luminance value A of the image data, and compares the average pixel luminance value A with a reference pixel luminance value A 0 : when A ⁇ A 0 , the backlight modulation selection unit selects to turn on the pulse width a modulation module, wherein the backlight driving signal is modulated by the pulse width modulation module to form a driving power supply to the backlight module; when A ⁇ A 0 , the backlight modulation selecting unit selects to enable the pulse frequency modulation And a module, wherein the backlight driving signal is modulated by the pulse frequency modulation module to form a driving power supply to the backlight module.
  • the liquid crystal display device and the backlight control method thereof are provided by the embodiment of the present invention, and the liquid crystal display device uses the CABC technology, wherein the backlight driving unit includes a pulse width modulation module and a pulse frequency modulation module, and the image is calculated by detecting The average pixel brightness value of the data determines the required backlight brightness level: when the required backlight brightness is large, the PWM dimming mode has a higher conversion efficiency, and the backlight drive signal is modulated by the pulse width modulation module to form a drive.
  • the backlight driving unit includes a pulse width modulation module and a pulse frequency modulation module
  • the image is calculated by detecting The average pixel brightness value of the data determines the required backlight brightness level: when the required backlight brightness is large, the PWM dimming mode has a higher conversion efficiency, and the backlight drive signal is modulated by the pulse width modulation module to form a drive.
  • the power supply is provided to the backlight module; when the required backlight brightness is small, the PFM (Pulse-Frequency Modulation) dimming mode has higher conversion efficiency, and the backlight drive signal is modulated by the pulse frequency modulation module.
  • a driving power source is formed for the backlight module.
  • FIG. 1 is a block diagram showing the structure of a conventional liquid crystal display device using CABC technology
  • FIG. 2 is a block diagram showing the structure of a liquid crystal display device according to an embodiment of the present invention.
  • the present embodiment provides a liquid crystal display device in which a new backlight control method is adopted, which improves the backlight control structure and method based on the CABC technology. Improve the efficiency of backlight driving.
  • the liquid crystal display device includes an image data acquiring unit 10 , a liquid crystal panel 20 , a panel driving unit 30 , a backlight module 40 , and a backlight driving unit 50 , and further includes a backlight modulation selecting unit 60 .
  • the image data acquiring unit 10 is configured to acquire each frame image data S RGB that the liquid crystal display device needs to display, and input each frame image data S RGB into the panel driving unit 30.
  • the panel driving unit 30 drives the liquid crystal panel 20 in accordance with each frame image data S RGB , and the panel driving unit 30 also generates a backlight driving signal S PWM corresponding to each frame image data S RGB .
  • the backlight driving unit 50 modulates the backlight driving signal S PWM to form a driving power source VL1, VL2 to be supplied to the backlight module 40, so that the backlight module 40 generates a display light source with corresponding brightness.
  • the liquid crystal panel 20 displays an image by the liquid crystal panel 20.
  • the backlight modulation selecting unit 60 is configured to detect and calculate an Average Picture Gray Level (APL) value of each frame image data S RGB from the image data acquiring unit 10, and calculate an average pixel brightness according to the detection. And determining, by comparing the detected average pixel brightness value with the size of the reference pixel brightness value set in the backlight modulation selecting unit 60, determining the brightness level of the backlight source that the backlight module 40 needs to provide, and controlling the backlight
  • the driving unit 50 modulates the backlight driving signal S PWM (pulse width modulation method or pulse frequency modulation method) to improve the efficiency of backlight driving.
  • PWM pulse width modulation method or pulse frequency modulation method
  • the backlight driving unit 50 includes a pulse width modulation module 51 and a pulse frequency modulation module 52, and according to the selection control of the backlight modulation selection unit 60 in the display period of each frame picture,
  • the backlight driving signal S PWM is pulse width modulated by the pulse width modulation module 51 to form a driving power source VL1 for the backlight module 40, or the backlight driving signal is used by the pulse frequency modulation module 52.
  • the S PWM performs pulse frequency modulation to form a driving power source VL2 to be supplied to the backlight module 40.
  • the average pixel brightness value of each frame image data S RGB detected and calculated by the backlight modulation selecting unit 60 is detected by A, and the set reference pixel brightness value is represented by A 0 , when A ⁇ A 0 ,
  • the backlight modulation selection unit 60 outputs an enable signal E1 to the backlight driving unit 50, selectively turns on the pulse width modulation module 51, and performs pulse width modulation on the backlight driving signal S PWM by the pulse width modulation module 51;
  • the backlight modulation selection unit 60 outputs an enable signal E2 to the backlight driving unit 50, selectively turns on the pulse frequency modulation module 52, and drives the backlight by the pulse frequency modulation module 52.
  • Signal S PWM performs pulse frequency modulation.
  • the backlight modulation selection unit 60 includes an average pixel brightness detection module 61 and a pixel brightness comparison module 62.
  • the average pixel brightness detecting module 61 is configured to detect and calculate an average pixel brightness value A of each frame image data S RGB from the image data acquiring unit 10, and the pixel brightness comparing module 62 is configured to store a reference pixel brightness value. A 0 , and compares the average pixel luminance value A with the reference pixel luminance value A 0 .
  • the average pixel brightness detection module 61 acquires each frame image data S RGB and calculates an average pixel brightness value A by gray histogram analysis.
  • the reference pixel brightness value A 0 can be set such that if the maximum pixel brightness value required in each frame of an image is displayed as A 1 , A 0 is set at 5% to 25% of A 1 Within the scope.
  • the backlight control method of the liquid crystal display device as described above mainly includes:
  • the panel driving unit 30 increases the grayscale brightness of the image data S RGB according to a numerical ratio, and forms a corresponding driving signal to be input to the liquid crystal panel 20;
  • the panel driving unit 30 generates the backlight driving signal S PWM according to a condition that the backlight module 40 reduces the brightness of the backlight according to the numerical ratio.
  • the first ratio is a percentage value, which is preset (can be set according to a specific image to be displayed and a power saving effect requested by the customer) and written into the panel driving unit 30 through a register, CABC
  • the technology is a relatively mature prior art, and the range of the numerical values is not specifically limited herein.
  • the value is selected to be 30%
  • the grayscale brightness of the image data S RGB is increased by 30% so that the image is brightened
  • the backlight brightness is reduced by 30% so that the image is darkened, so that the brightness of the image is processed.
  • the backlight power consumption is selected to be 30%.
  • the backlight modulation selecting unit 60 detects each frame image data S RGB from the image data acquiring unit 10, and passes the gray scale. The histogram analysis calculates an average pixel luminance value A, and compares the average pixel luminance value A with the reference pixel luminance value A 0 . When A ⁇ A 0 , the backlight modulation selection unit 60 selects to turn on the pulse width modulation module 51.
  • the backlight driving signal S PWM is pulse widthed by the pulse width modulation module 51 to form a driving power source VL1 to be provided to the backlight module 40; when A ⁇ A 0 , the backlight modulation selecting unit 60 selects to turn on the The pulse frequency modulation module 52 performs pulse frequency modulation on the backlight driving signal S PWM by the pulse frequency modulation module 52 to form a driving power source VL2 to be supplied to the backlight module 40.
  • the liquid crystal display device and the backlight control method thereof are provided by the embodiment of the present invention, and the liquid crystal display device uses the CABC technology to reduce backlight power consumption; wherein the backlight driving unit includes a pulse width modulation module and pulse frequency modulation
  • the module determines the required backlight brightness level by detecting the average pixel brightness value of the image data: when the required backlight brightness is large, the PWM dimming mode with higher efficiency is adopted; when the required backlight brightness is small, the module adopts More efficient PFM dimming mode at this time The overall improvement in backlight drive efficiency.

Abstract

一种液晶显示装置及其背光控制方法，液晶显示装置包括图像数据获取部（10）、液晶面板（20）以及面板驱动单元（30）、背光模组（40）以及背光驱动单元（50）；其中，面板驱动单元（30）根据图像数据（SRGB）驱动液晶面板（20），并生成对应于图像数据（SRGB）的背光驱动信号（SPWM）；背光驱动单元（50）包括脉冲宽度调制模块（51）和脉冲频率调制模块（52），分别用于对背光驱动信号（SPWM）进行调制，形成驱动电源（VL1，VL2）提供给背光模组（40）；液晶显示装置还包括背光调制选择单元（60），用于检测并计算图像数据（SRGB）的平均像素亮度值A，背光调制选择单元（60）中还设定有一基准像素亮度值A0；当A≥A0时，背光调制选择单元（60）选择开启脉冲宽度调制模块（51）；当A＜A0时，背光调制选择单元（60）选择开启脉冲频率调制模块（52）。

Description

液晶显示装置及其背光控制方法 技术领域
本发明涉及显示技术领域，尤其是一种液晶显示装置及其背光控制方法。
背景技术
当今社会上流行使用的各种手机、平板显示装置中，功耗最大的部分为背光部分，而且手机、平板显示装置轻薄化的趋势又决定了电池的大小和容量的可变性极其有限。为了解决电池容量大小有限而又想降低功耗这一问题，目前通常使用内容对应背光控制(Content Adaptive Brightness Control，CABC)技术，CABC技术是一种主要用于液晶显示屏(Liquid Crystal Display，LCD)的背光省电技术。
具体地，CABC技术可以根据屏幕显示的图像来调整该图像的灰阶亮度与屏幕背光亮度之间的关系，在有效降低屏幕背光亮度的同时，基本保持图像的显示效果。比如，将图像的灰阶亮度提高30％使得图像变亮，并将LCD屏幕的背光亮度降低30％使得图像变暗，这样就可以使得图像所呈现的亮度在处理前后基本保持一致，但减少了30％的背光功耗。背光亮度可以通过驱动电压的大小来控制，如图1所示的现有的一种使用CABC技术的液晶显示装置，其主要包括图像数据获取部1、液晶面板2以及面板驱动单元3、背光模组4以及PWM(Pulse-Width Modulation，脉宽调制)背光调制单元5。图像数据获取部1用于获取图像数据SRGB，面板驱动单元3根据所述图像数据SRGB驱动所述液晶面板2，并生成对应于所述图像数据SRGB的背光驱动信号SPWM。所述PWM背光调制单元5对所述背光驱动信号SPWM进行脉宽调制，形成驱动电源VL提供给所述背光模组4。
如上结构的液晶显示装置中，其对背光的调光方式采用对背光驱动信号SPWM进行脉宽调制的单一方式，当需要的背光亮度较大时，PWM调光模式具有较高的转换效率；但是当需要的背光亮度较小时，PWM调光模式的占空比很低，大大降低了背光驱动的效率，不利于液晶显示装置整体系统能量的有效利用。
发明内容
有鉴于此，本发明提供了一种液晶显示装置及其背光控制方法，该液晶显示装置使用CABC技术，通过对背光控制结构及方法的改进，从整体上提高了背光驱动的效率。
为了达到上述目的，本发明采用了如下技术方案：
一种液晶显示装置，包括图像数据获取部、液晶面板以及面板驱动单元、背光模组以及背光驱动单元；其中，所述图像数据获取部用于获取图像数据；所述面板驱动单元根据所述图像数据驱动所述液晶面板，并生成对应于所述图像数据的背光驱动信号；所述背光驱动单元包括脉冲宽度调制模块和脉冲频率调制模块，在一个显示周期内，所述脉冲宽度调制模块和脉冲频率调制模块的其中之一对所述背光驱动信号进行调制，形成驱动电源提供给所述背光模组；所述液晶显示装置还包括背光调制选择单元，用于检测并计算所述图像数据的平均像素亮度值A，所述背光调制选择单元中还设定有一基准像素亮度值A0；当A≥A0时，所述背光调制选择单元选择开启所述脉冲宽度调制模块；当A＜A0时，所述背光调制选择单元选择开启所述脉冲频率调制模块。
其中，所述背光调制选择单元包括平均像素亮度检测模块和像素亮度比较模块；所述平均像素亮度检测模块用于检测并计算所述图像数据的平均像素亮度值A，所述像素亮度比较模块用于存储基准像素亮度值A0，并比较平均像素亮度值A与基准像素亮度值A0的大小。
其中，所述平均像素亮度检测模块获取所述图像数据，通过灰度直方图分析计算得到平均像素亮度值A。
其中，所述基准像素亮度值A0为所述图像数据获取部所获取的图像数据的像素亮度最大值的5％～25％。
其中，所述面板驱动单元从所述图像数据获取部接收图像数据，按照一数值比例提升所述图像数据的灰阶亮度以驱动所述液晶面板；所述面板驱动单元根据使得所述背光模块按照所述数值比例降低背光亮度的条件生成所述背光驱动信号。
其中，所述数值比例为预先设定并通过寄存器写入到所述面板驱动单元中。
如上所述的液晶显示装置的背光控制方法，其包括：由所述面板驱动单元 从所述图像数据获取部接收图像数据，生成对应于所述图像数据的背光驱动信号；由所述背光调制选择单元检测并计算所述图像数据的平均像素亮度值A，将平均像素亮度值A与基准像素亮度值A0进行比较：当A≥A0时，所述背光调制选择单元选择开启所述脉冲宽度调制模块，由所述脉冲宽度调制模块对所述背光驱动信号进行调制，形成驱动电源提供给所述背光模组；当A＜A0时，所述背光调制选择单元选择开启所述脉冲频率调制模块，由所述脉冲频率调制模块对所述背光驱动信号进行调制，形成驱动电源提供给所述背光模组。
相比于现有技术，本发明实施例提供的液晶显示装置及其背光控制方法，该液晶显示装置使用CABC技术，其中的背光驱动单元包括脉冲宽度调制模块和脉冲频率调制模块，通过检测计算图像数据的平均像素亮度值，确定需要的背光亮度级别：当需要的背光亮度较大时，PWM调光模式具有较高的转换效率，此时由脉冲宽度调制模块对背光驱动信号进行调制，形成驱动电源提供给背光模组；当需要的背光亮度较小时，PFM(Pulse-Frequency Modulation，脉冲频率调制)调光模式具有更高的转换效率，此时由脉冲频率调制模块对背光驱动信号进行调制，形成驱动电源提供给背光模组。基于以上，通过对背光控制结构及方法的改进，从整体上提高了背光驱动的效率。
附图说明
图1是现有的一种使用CABC技术的液晶显示装置的结构框图；
图2是本发明实施例提供的液晶显示装置的结构框图。
具体实施方式
下面将结合附图以及具体实施例，对本发明实施例中的技术方案进行详细地描述，显然，所描述的实施例仅仅是本发明一部分实例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护范围。
在此，还需要说明的是，为了避免因不必要的细节而模糊了本发明，在附图中仅仅示出了与根据本发明的方案密切相关的结构和/或处理步骤，而省略了与本发明关系不大的其他细节。
本实施例提供了一种液晶显示装置，其中采用了一种新的背光控制方法，该方法在CABC技术的基础上，通过对背光控制结构及方法的改进，从整体上 提高了背光驱动的效率。具体地，如图2所示，该液晶显示装置包括图像数据获取部10、液晶面板20以及面板驱动单元30、背光模组40以及背光驱动单元50，还包括背光调制选择单元60。
其中，所述图像数据获取部10用于获取所述液晶显示装置需要显示的每一帧图像数据SRGB，并将每一帧图像数据SRGB输入到面板驱动单元30。所述面板驱动单元30根据每一帧图像数据SRGB驱动所述液晶面板20，并且所述面板驱动单元30还生成对应于每一帧图像数据SRGB的背光驱动信号SPWM。所述背光驱动单元50对所述背光驱动信号SPWM进行调制，形成驱动电源VL1、VL2提供给所述背光模组40，以使所述背光模组40产生相应亮度的显示光源提供给所述液晶面板20，由液晶面板20显示图像。所述背光调制选择单元60用于从所述图像数据获取部10中检测并计算每一帧图像数据SRGB的平均像素亮度(Average Picture gray Level，APL)值，根据检测计算到的平均像素亮度值，通过比较检测计算到平均像素亮度值与预先在背光调制选择单元60中设定的基准像素亮度值的大小，判断所述背光模组40需要提供的背光光源的亮度水平，控制所述背光驱动单元50对所述背光驱动信号SPWM进行调制的方式(脉冲宽度调制方式或脉冲频率调制方式)，以提高背光驱动的效率。
具体地，如图2所示，所述背光驱动单元50包括脉冲宽度调制模块51和脉冲频率调制模块52，在每一帧画面的显示周期内，根据所述背光调制选择单元60的选择控制，由所述脉冲宽度调制模块51对所述背光驱动信号SPWM进行脉冲宽度调制，形成驱动电源VL1提供给所述背光模组40，或者是由所述脉冲频率调制模块52对所述背光驱动信号SPWM进行脉冲频率调制，形成驱动电源VL2提供给所述背光模组40。其中，以A表示所述背光调制选择单元60检测并计算获得的每一帧图像数据SRGB的平均像素亮度值，以A0表示设定的基准像素亮度值，当A≥A0时，所述背光调制选择单元60输出使能信号E1至所述背光驱动单元50，选择开启所述脉冲宽度调制模块51，由所述脉冲宽度调制模块51对所述背光驱动信号SPWM进行脉冲宽度调制；当A＜A0时，所述背光调制选择单元60输出使能信号E2至所述背光驱动单元50，选择开启所述脉冲频率调制模块52，由所述脉冲频率调制模块52对所述背光驱动信号SPWM进行脉冲频率调制。
具体地，如图2所示，所述背光调制选择单元60包括平均像素亮度检测模块61和像素亮度比较模块62。所述平均像素亮度检测模块61用于从所述图像 数据获取部10中检测并计算每一帧图像数据SRGB的平均像素亮度值A，所述像素亮度比较模块62用于存储基准像素亮度值A0，并比较平均像素亮度值A与基准像素亮度值A0的大小。其中，所述平均像素亮度检测模块61获取每一帧图像数据SRGB，通过灰度直方图分析计算得到平均像素亮度值A。其中，所述基准像素亮度值A0可以这样设定：若显示一幅图像各帧画面中需要的最大像素亮度值为A1，则将A0设定在A1的5％～25％的范围内。
进一步地，如上所述的液晶显示装置的背光控制方法主要包括：
(1)、采用CABC技术：一方面，所述面板驱动单元30按照一数值比例提升所述图像数据SRGB的灰阶亮度，形成相应的驱动信号输入到所述液晶面板20；另一方面，所述面板驱动单元30根据使得所述背光模块40按照所述数值比例降低背光亮度的条件生成所述背光驱动信号SPWM。其中，所述的第一比例是一个百分比的数值，预先设定(可以根据需要显示的具体图像及客户要求省电效果来设定)并通过寄存器写入到所述面板驱动单元30中，CABC技术是一种比较成熟的现有技术，对于该数值的范围在此不再具体限定。通常地，该数值选择为30％，将图像数据SRGB的灰阶亮度提高30％使得图像变亮，并将背光亮度降低30％使得图像变暗，这样就可以使得图像所呈现的亮度在处理前后基本保持一致，但减少30％的背光功耗。
(2)、判断需要提供的背光光源的亮度水平，选择相应的调光方式：由所述背光调制选择单元60从所述图像数据获取部10中检测每一帧图像数据SRGB，通过灰度直方图分析计算得到平均像素亮度值A，将平均像素亮度值A与基准像素亮度值A0进行比较，当A≥A0时，所述背光调制选择单元60选择开启所述脉冲宽度调制模块51，由所述脉冲宽度调制模块51对所述背光驱动信号SPWM进行脉冲宽度，形成驱动电源VL1提供给背光模组40；当A＜A0时，所述背光调制选择单元60选择开启所述脉冲频率调制模块52，由所述脉冲频率调制模块52对所述背光驱动信号SPWM进行脉冲频率调制，形成驱动电源VL2提供给背光模组40。
综上所述，本发明实施例提供的的液晶显示装置及其背光控制方法，该液晶显示装置使用CABC技术，减小了背光功耗；其中的背光驱动单元包括脉冲宽度调制模块和脉冲频率调制模块，通过检测计算图像数据的平均像素亮度值，确定需要的背光亮度级别：当需要的背光亮度较大时，采用此时效率更高的PWM调光模式；当需要的背光亮度较小时，采用此时效率更高的PFM调光模 式，从而整体上提高了背光驱动的效率。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
显然，本发明的保护范围并不局限于上诉的具体实施方式，本领域的技术人员可以对发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (14)

  1. 一种液晶显示装置，包括图像数据获取部、液晶面板以及面板驱动单元、背光模组以及背光驱动单元；其中，
    所述图像数据获取部用于获取图像数据；
    所述面板驱动单元根据所述图像数据驱动所述液晶面板，并生成对应于所述图像数据的背光驱动信号；
    所述背光驱动单元包括脉冲宽度调制模块和脉冲频率调制模块，在一个显示周期内，所述脉冲宽度调制模块和脉冲频率调制模块的其中之一对所述背光驱动信号进行调制，形成驱动电源提供给所述背光模组；
    所述液晶显示装置还包括背光调制选择单元，用于检测并计算所述图像数据的平均像素亮度值A，所述背光调制选择单元中还设定有一基准像素亮度值A0；当A≥A0时，所述背光调制选择单元选择开启所述脉冲宽度调制模块；当A＜A0时，所述背光调制选择单元选择开启所述脉冲频率调制模块。
  2. 根据权利要求1所述的液晶显示装置，其中，所述背光调制选择单元包括平均像素亮度检测模块和像素亮度比较模块；所述平均像素亮度检测模块用于检测并计算所述图像数据的平均像素亮度值A，所述像素亮度比较模块用于存储基准像素亮度值A0，并比较平均像素亮度值A与基准像素亮度值A0的大小。
  3. 根据权利要求2所述的液晶显示装置，其中，所述平均像素亮度检测模块获取所述图像数据，通过灰度直方图分析计算得到平均像素亮度值A。
  4. 根据权利要求1所述的液晶显示装置，其中，所述基准像素亮度值A0为所述图像数据获取部所获取的图像数据的像素亮度最大值的5％～25％。
  5. 根据权利要求2所述的液晶显示装置，其中，所述基准像素亮度值A0为所述图像数据获取部所获取的图像数据的像素亮度最大值的5％～25％。
  6. 根据权利要求3所述的液晶显示装置，其中，所述基准像素亮度值A0为所述图像数据获取部所获取的图像数据的像素亮度最大值的5％～25％。
  7. 根据权利要求1所述的液晶显示装置，其中，所述面板驱动单元从所述 图像数据获取部接收图像数据，按照一数值比例提升所述图像数据的灰阶亮度以驱动所述液晶面板；所述面板驱动单元根据使得所述背光模块按照所述数值比例降低背光亮度的条件生成所述背光驱动信号。
  8. 根据权利要求1所述的液晶显示装置，其中，所述数值比例为预先设定并通过寄存器写入到所述面板驱动单元中。
  9. 一种液晶显示装置的背光控制方法，其中，所述液晶显示装置包括图像数据获取部、液晶面板以及面板驱动单元、背光模组以及背光驱动单元，所述背光驱动单元包括脉冲宽度调制模块和脉冲频率调制模块，所述液晶显示装置还包括背光调制选择单元，所述背光控制方法具体包括：
    由所述面板驱动单元从所述图像数据获取部接收图像数据，生成对应于所述图像数据的背光驱动信号；
    由所述背光调制选择单元检测并计算所述图像数据的平均像素亮度值A，将平均像素亮度值A与基准像素亮度值A0进行比较：
    当A≥A0时，所述背光调制选择单元选择开启所述脉冲宽度调制模块，由所述脉冲宽度调制模块对所述背光驱动信号进行调制，形成驱动电源提供给所述背光模组；
    当A＜A0时，所述背光调制选择单元选择开启所述脉冲频率调制模块，由所述脉冲频率调制模块对所述背光驱动信号进行调制，形成驱动电源提供给所述背光模组。
  10. 根据权利要求9所述的背光控制方法，其中，所述背光调制选择单元获取所述图像数据，通过灰度直方图分析计算得到平均像素亮度值A。
  11. 根据权利要求9所述的背光控制方法，其中，所述基准像素亮度值A0为所述图像数据获取部所获取的图像数据的像素亮度最大值的5％～25％。
  12. 根据权利要求10所述的背光控制方法，其中，所述基准像素亮度值A0为所述图像数据获取部所获取的图像数据的像素亮度最大值的5％～25％。
  13. 根据权利要求9所述的背光控制方法，其中，所述面板驱动单元从所述图像数据获取部接收图像数据，按照一数值比例提升所述图像数据的灰阶亮度以驱动所述液晶面板；所述面板驱动单元根据使得所述背光模块按照所述数值比例降低背光亮度的条件生成所述背光驱动信号。
  14. 根据权利要求13所述的背光控制方法，其中，所述数值比例为预先设定并通过寄存器写入到所述面板驱动单元中。
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