Backlight Region Control for Color Uniformity
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Solution Overview
Problem
Conventional display control devices fail to adequately compensate for color changes in backlight emissions, leading to noticeable color differences at region boundaries due to light leakage from peripheral regions.
Innovation Solution
A display control device that calculates feature amounts for each region, generates light source control values, and performs color and luminance conversions to minimize color differences by considering pixel position and surrounding regions, allowing for precise control of backlight emission and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emission amount of the backlight is controlled for each region to enhance contrast and reduce power consumption, then the contrast enhancement and power consumption reduction are improved, but color differences become noticeable at region boundaries due to light leakage from peripheral regions
Solution Approach 1:
The backlight is divided into multiple regions with independent light emission control. Each region can be dimmed separately to enhance contrast while the patent addresses color uniformity by considering light leakage between segmented regions through the light distribution table
Solution Approach 2:
Different regions of the backlight are controlled with different light emission amounts according to local image requirements. The patent enhances this by adjusting the light source control value of each region based on calculated light leakage from peripheral regions, ensuring local color accuracy while maintaining overall contrast enhancement
Solution Approach 3:
The system calculates light distribution and light leakage between regions using a light distribution table, then uses this feedback information to adjust the light source control values. This feedback mechanism compensates for color shifts caused by light leakage, maintaining color uniformity across region boundaries
2Use of energy by stationary object
If the light emission amount is varied between regions, then power consumption is reduced and contrast is enhanced, but color changes in emitted light become noticeable at region boundaries
Solution Approach 1:
The system pre-calculates the light distribution and light leakage between regions using a light distribution table before generating the final light source control values. This preliminary action allows the system to compensate for color shifts in advance, ensuring color consistency is maintained while achieving power consumption reduction through selective region dimming
Solution Approach 2:
The patent adjusts the light source control values by applying compensation based on calculated light leakage. This parameter change approach modifies the emission intensity of each region to counteract color shifts, maintaining color consistency while preserving the power consumption benefits of selective dimming
Data Source
AI summary
In an image display device including a backlight (6) divided into multiple regions, color shift information (CSR, CSB) is generated from a light source control value (BL(i,j)) for each region, the region to which a pixel of interest belongs and regions therearound are taken as reference regions, luminance conversion information is generated from the light source control value for each reference region, color conversion information is generated from the color shift information for each reference region, and an image signal is converted based on the color conversion information and luminance conversion information, so that an output image signal is generated. Even when there is light leakage from a peripheral region, it is possible to perform color correction so that the color difference is not noticeable at a region boundary portion.