Liquid Crystal Display Backlight Zone Compensation for Chromatic Aberration
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Solution Overview
Problem
Liquid crystal display devices with dynamic zoned backlight control suffer from random partial chromatic aberrations due to differences in backlight brightness between adjacent zones, leading to bluish or yellowish distortions in image display.
Innovation Solution
The method involves statistically analyzing grayscale brightness in each display zone, compensating pixel voltage values based on these differences, and adjusting the power of LED chips to ensure uniform backlight brightness across zones, thereby alleviating chromatic aberrations by comparing backlight values in target zones with weighted averages from adjacent zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If zoned dynamic backlight modulation is used to improve display contrast, then the display contrast is improved, but random partial chromatic aberrations occur due to differences in backlight brightness between adjacent zones
Solution Approach 1:
The patent adjusts the backlight brightness parameters in different zones by comparing target zone backlight values with weighted averages from adjacent zones, and compensates pixel voltage values accordingly. This dynamic parameter adjustment resolves the chromatic aberration caused by zoned backlight modulation while preserving the contrast improvement benefit.
Solution Approach 2:
The patent implements a feedback mechanism where the backlight comparing section continuously monitors and compares backlight values between target zones and adjacent zones, then uses this feedback information to compensate pixel voltage values. This closed-loop control eliminates chromatic aberrations while maintaining the contrast enhancement from zoned backlight modulation.
2Loss of energy
If backlight brightness is controlled by acquiring average brightness over one frame (global backlight modulation), then energy is saved, but the quality of picture effect for display contrast is not significantly improved
Solution Approach 1:
The patent divides the backlight into multiple zones and controls each zone independently based on local image brightness characteristics, rather than using global average brightness control. This segmentation enables both energy efficiency and improved display contrast by applying backlight modulation only where needed.
Data Source
AI summary
Embodiments of the application provide an image processing method and apparatus, and a liquid crystal display device, and relate to the field of image processing, where backlight values in respective backlight zones are determined as a function of values of grayscale brightness in a displayed image, display values in sub-pixels in a display zone corresponding to a target backlight zone are compensated for according to the result of comparing the backlight value in the target backlight zone with the weighted average of the backlight values in the other backlight zones.