Display Pixel Correction for Liquid Crystal Disclination
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Solution Overview
Problem
High-resolution liquid crystal display devices face issues with disclination due to reduced pixel pitch, which degrades image quality by causing potential differences between adjacent pixels, leading to orientation of liquid crystal molecules in undesired directions and decreased contrast.
Innovation Solution
A display device and method that determine a correction value based on gradation data differences between a target pixel and its peripheral pixels in horizontal, vertical, and oblique directions, adjusting the pixel value to reduce these differences and prevent disclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel pitch is reduced to improve resolution, then the display resolution is improved, but disclination occurs due to potential differences between adjacent pixels
Solution Approach 1:
The signal processing unit performs preliminary correction on the gradation data before it is applied to the display pixels. By calculating correction values based on the gradation data of target pixels and their peripheral pixels, and adjusting the pixel values in advance, the system prevents disclination from occurring rather than correcting it after it appears. This preliminary action resolves the contradiction by maintaining image quality (preventing disclination) while allowing the use of reduced pixel pitch for high resolution.
2Stability of the object's composition
If the pretilt angle is increased to improve vertical alignment property, then the vertical alignment is improved, but the black level is raised and contrast is reduced
Solution Approach 1:
The system changes the parameter of gradation data (pixel values) to resolve the contradiction between vertical alignment property and contrast. By adjusting the pixel values based on correction values calculated from peripheral pixel differences, the system maintains the desired pretilt angle for vertical alignment while compensating for any black level shifts, thereby preserving contrast. This parameter change approach allows both vertical alignment property and contrast to be maintained simultaneously.
3Illumination intensity
If the pretilt angle is decreased to increase contrast, then the contrast is improved, but disclination occurs more easily
Solution Approach 1:
The signal processing unit performs preliminary correction on the gradation data before it is applied to the display pixels. By calculating correction values based on the gradation data of target pixels and their peripheral pixels, and adjusting the pixel values in advance, the system prevents disclination from occurring rather than correcting it after it appears. This preliminary action resolves the contradiction by maintaining image quality (preventing disclination) while allowing the use of reduced pixel pitch for high resolution.
4Reliability
If the pixel value is adjusted to reduce gradation differences between pixels, then disclination is prevented, but additional signal processing is required
Solution Approach 1:
The signal processing unit uses the gradation data of peripheral pixels themselves to generate the correction values needed for the target pixel. The system serves itself by utilizing the existing pixel data to create the correction information, rather than requiring external correction data or complex lookup tables. This self-service approach prevents disclination while keeping the signal processing relatively simple, as the correction values are derived directly from the pixel array's own data.
Data Source
AI summary
A display device includes a display pixel unit and a signal processing unit. The display pixel unit includes a plurality of pixels arranged in a horizontal direction and a vertical direction. The signal processing unit determines a correction value corresponding to a target pixel based on differences between gradation data of the target pixel and gradation data of peripheral pixels disposed in the horizontal direction, the vertical direction, and an oblique direction with respect to the target pixel, respectively, among the plurality of pixels, increases or decreases a pixel value of the target pixel based on the correction value, and corrects the gradation data of the target pixel to reduce the differences.