Image Uniformity Compensation Circuit for Flat Panel Displays
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Solution Overview
Problem
Large flat panel displays often suffer from poor image uniformity, particularly in luminance and chromaticity, which affects the viewer's experience and worsens with increasing display size, as existing technologies have not effectively addressed these issues.
Innovation Solution
An image uniformity compensation device comprising local pre-compensation, chromaticity uniformity compensation, and luminance uniformity correction circuits that convert image frames between optical non-linear and linear domains using lookup tables to achieve accurate chromaticity and luminance corrections, improving image uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel size is increased, then the display area is enlarged, but the image uniformity deteriorates
Solution Approach 1:
The patent divides the display panel into multiple regions (first region, second region, third region, fourth region) and applies different compensation parameters to each region. This segmentation allows tailored compensation for different areas of the display, addressing the uniformity issues that arise in larger panels where edge effects and manufacturing variations are more pronounced.
Solution Approach 2:
The patent applies different compensation parameters to different regions of the display panel. Specifically, it uses first compensation parameters for the first and second regions, and second compensation parameters for the third and fourth regions. This local quality approach allows each region to receive optimized compensation tailored to its specific characteristics, thereby maintaining image uniformity across the entire enlarged display area.
2Device complexity
If conventional compensation methods are used, then the compensation process is simple, but the chromaticity and luminance uniformity are insufficient
Solution Approach 1:
The patent performs preliminary compensation by converting the input image data from a non-linear optical domain to a linear optical domain before applying chromaticity and luminance compensation. This preliminary action prepares the data in a suitable format for accurate compensation calculations, enabling precise control over chromaticity and luminance uniformity while maintaining a structured and manageable compensation process.
Solution Approach 2:
The patent changes the domain parameters by transitioning from a non-linear optical domain to a linear optical domain through a conversion process. This parameter change enables more accurate and precise compensation calculations, thereby achieving superior chromaticity and luminance uniformity compared to conventional methods that operate directly in the non-linear domain.
Data Source
AI summary
The disclosure provides an image uniformity compensation device. The image uniformity compensation device includes a local pre-compensation circuit, a chromaticity uniformity compensation circuit, a local post-compensation circuit, and a luminance uniformity correction circuit. A local pre-conversion performed by the local pre-compensation circuit includes the following. An image frame is divided into multiple regions, and each of the regions is converted from an optical non-linear domain to an optical linear domain to generate a corresponding region in multiple regions of a converted frame. A local post-conversion performed by the local post-compensation circuit includes the following. An image frame is divided into multiple regions, and each of the regions is converted from the optical linear domain to the optical non-linear domain to generate a corresponding region in multiple regions of a converted frame.