LCD Subpixel Gray Level Correction for Color Shift Reduction
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Solution Overview
Problem
Liquid crystal displays (LCDs) suffer from color shift issues when viewed directly versus at an angle, which existing 2D1G technology partially addresses but at the cost of reducing the aperture ratio due to increased data lines.
Innovation Solution
A method and device that corrects the gray levels of subpixels to converge to a standard gamma curve of 2.2, using lookup processes and edge detection to adjust gray levels, thereby reducing color shift without compromising aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If 2D1G technology is used to reduce color shift, then color shift is reduced, but the aperture ratio is greatly reduced due to doubled data lines
Solution Approach 1:
The patent applies parameter changes by modifying the gray level values of subpixels through gamma correction and lookup tables. Instead of changing the physical structure (data lines), it changes the electrical/optical parameters (gray levels) to compensate for viewing angle effects, thereby reducing color shift while maintaining the original aperture ratio.
Solution Approach 2:
The patent replaces the mechanical/structural approach (adding more data lines as in 2D1G) with a software/image processing approach (gamma correction and gray level adjustment). This substitution eliminates the need for additional physical connections while achieving the same color shift reduction goal.
2Object-affected harmful factors
If 2D1G technology divides subpixels into primary and secondary areas with different data lines, then color shift is reduced, but device complexity increases
Solution Approach 1:
The patent replaces the complex physical data line configuration with a simpler image processing algorithm. The gamma correction and lookup table approach requires no additional hardware complexity while achieving color shift reduction through software-based gray level adjustment.
Solution Approach 2:
The patent makes the existing data lines serve multiple functions by using them for both normal pixel driving and color shift compensation through gray level adjustment. This universal approach eliminates the need for separate dedicated data lines for each subpixel area, reducing overall device complexity.
Data Source
AI summary
A method for processing an image includes the following steps. A data of the image including a first pixel and a second pixel adjacent to each other is provided. A first subpixel of the first pixel and a second subpixel of the second pixel are set as a higher subpixel and a lower subpixel. A lookup process is performed to determine a shifted gray level of the higher subpixel and a shifted gray level of the lower subpixel in accordance with the gray level of the higher subpixel and the gray level of the lower subpixel respectively. A gray level of the higher subpixel and a gray level of the lower subpixel are updated in accordance with the shifted gray level of the higher subpixel and the shifted gray level of the lower subpixel.