Zoned LCD Backlight Brightness Control via Gain Coefficient
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Solution Overview
Problem
Existing liquid crystal display (LCD) technologies face limitations in improving dynamic contrast and energy efficiency due to the inability to accurately control backlight brightness across different zones, leading to suboptimal image quality and increased power consumption.
Innovation Solution
A method and apparatus for controlling LCD brightness by determining grayscale values of pixels in zone image data blocks, applying a backlight value gain coefficient, and adjusting backlight values based on ambient luminance to enhance peak brightness and contrast, utilizing a zoned dynamic backlight modulation approach.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If dynamic backlight modulation is applied to the entire image, then energy consumption is reduced, but peak brightness and dynamic contrast are limited
Solution Approach 1:
The patent divides the backlight system into multiple independent zones, each with its own backlight units that can be controlled separately. This segmentation allows different regions to have different brightness levels, enabling peak brightness enhancement in specific zones while maintaining energy efficiency in other areas through zoned dynamic backlight modulation.
2Device complexity
If backlight brightness is uniformly controlled across the display, then device complexity is reduced, but image quality and dynamic contrast are compromised
Solution Approach 1:
The display is divided into multiple backlight zones with independent control, allowing different regions to be optimized for different image content requirements. This enables enhanced image quality and dynamic contrast through localized brightness control while maintaining manageable system complexity through modular zone management.
Solution Approach 2:
Different zones of the backlight system are assigned different brightness characteristics based on local image requirements. This local quality approach allows specific zones to achieve peak brightness for high-contrast content while other zones maintain appropriate brightness levels, overall enhancing image quality without requiring uniform high complexity across the entire system.
3Illumination intensity
If zoned backlight control is implemented, then peak brightness and dynamic contrast are improved, but device complexity increases
Solution Approach 1:
The backlight system is segmented into multiple independently controllable zones, enabling dynamic contrast enhancement through localized brightness control. This segmentation allows the system to achieve high dynamic contrast by adjusting individual zones based on image content while managing complexity through modular architecture.
Data Source
AI summary
This disclosure provides a method and apparatus for controlling liquid crystal display brightness, and a liquid crystal display device, and relates to the field of liquid crystal display technologies, where the method includes: determining grayscale values of all pixels in a zone image data block under a predetermined rule according to a received image signal, and pre-obtaining a zone backlight value corresponding to the zone image data block according to the grayscale values; multiplying the pre-obtained zone backlight value with a backlight value gain coefficient to obtain a backlight value of a backlight zone corresponding to the zone image data block to which a gain is applied, wherein the backlight value gain coefficient is more than 1; and outputting the backlight value of the backlight zone to a driver circuit of backlight source in the backlight zone to control the brightness of the backlight source in the backlight zone as a result of driving, thus improving the effect of contrast quality of pictures displayed by the liquid crystal display device.