3D LCD Backlight Luminance Uniformity Compensation
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Solution Overview
Problem
3D liquid crystal displays experience luminance uniformity issues due to varying transmittance across regions, leading to non-uniform illumination when glasses and backlight are turned on simultaneously during 3D displaying.
Innovation Solution
A method and system that acquire transmittance and adjust luminance across predetermined regions of a liquid crystal display panel, calculating the required backlight luminance using specific formulas to ensure uniformity, involving a transmittance acquiring unit, region luminance adjusting unit, and backlight luminance calculating unit to compensate for backlight in each region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If glasses and backlight are turned on at the same time during 3D displaying, then 3D stereoscopic effect is achieved, but luminance uniformity deteriorates due to varying transmittance across regions
Solution Approach 1:
The patent applies local quality by dividing the backlight into multiple independent regions and controlling the luminance of each region separately. The backlight is segmented into first, second, third and fourth regions with different luminance values, allowing each region to be optimized independently to compensate for varying panel transmittance characteristics in different areas, thereby achieving uniform overall luminance while maintaining 3D display capability
Solution Approach 2:
The backlight is divided into multiple independent controllable regions (first backlight region, second backlight region, third backlight region, fourth backlight region) that can be controlled separately. This segmentation allows different luminance values to be applied to different regions, compensating for the non-uniform transmittance of the liquid crystal display panel across its surface, thus resolving the luminance uniformity issue while preserving 3D display functionality
2Productivity
If liquid crystal molecules rotate at different times in different regions, then refresh operation is achieved, but perceived luminance uniformity deteriorates when backlight is continuously on
Solution Approach 1:
The patent changes the luminance parameter of the backlight in different regions to compensate for the non-uniform transmittance characteristics of the liquid crystal display panel. By adjusting the luminance values of different backlight regions (Y1, Y2, Y3, Y4) according to the specific transmittance characteristics of each region, the overall perceived luminance uniformity is improved while maintaining the refresh operation capability
Solution Approach 2:
The patent performs preliminary action by pre-calculating and setting appropriate luminance values for different backlight regions based on the panel's transmittance characteristics before actual display operation. This preliminary configuration ensures that even though liquid crystal molecules rotate at different times in different regions during refresh, the perceived luminance remains uniform when the backlight is continuously on during 3D display
Data Source
AI summary
A method for improving luminance uniformity of a 3D liquid crystal display in 3D displaying, comprising: acquiring transmittance of each of n predetermined regions of a liquid crystal display panel, wherein n is a positive integer; adjusting original luminance of each region; and calculating luminance of backlight corresponding to each region according to the transmittance and the adjusted luminance of each region. A system for improving luminance uniformity of a 3D liquid crystal display in 3D displaying is also disclosed. The system improves the luminance uniformity of the 3D liquid crystal display in 3D displaying by compensating for backlight of each of regions of the liquid crystal display panel, so that the luminance of the liquid crystal display panel in 3D displaying that is actually felt by eyes may not be un-uniform.