LCD Driver Adjusting Gray Scales to Reduce Color Shifting
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Solution Overview
Problem
Conventional liquid crystal display (LCD) systems suffer from color shifting issues when viewed directly and from the sides due to differences in luminance and retardation values at various angles, leading to adverse effects on display quality and resolution.
Innovation Solution
A liquid crystal display system that adjusts gray scales of pixels using an adjusted gray scale generator to minimize luminance differences between front and side views, employing a method of dividing an image frame into subframes with specific adjusted gray scales to maintain consistent brightness and reduce color shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional LCD panels are used, then the display can be manufactured with standard pixel structures, but color shifting occurs when viewed from different angles due to differences in luminance and retardation values
Solution Approach 1:
The patent divides each pixel into multiple sub-pixels (e.g., four sub-pixels) with different characteristics, where each sub-pixel is optimized for specific viewing angles. This segmentation allows the display to maintain standard pixel manufacturing while reducing color shifting by having specialized sub-pixels for different viewing conditions.
Solution Approach 2:
Different sub-pixels within a pixel are assigned different characteristics and luminance values tailored to specific viewing angles. The first sub-pixel is optimized for frontal viewing while the second sub-pixel is optimized for side viewing, creating local quality variations that compensate for angle-dependent color shifts.
2Object-affected harmful factors
If multiple pixels are used to display images at different viewing angles, then color shifting can be reduced, but display resolution is adversely affected
Solution Approach 1:
Instead of using multiple separate pixels, the patent segments each pixel into sub-pixels that can be independently controlled. This allows the display to maintain the original pixel count and resolution while achieving multi-angle optimization through the sub-pixel structure.
Solution Approach 2:
The patent introduces a temporal dimension by displaying different sub-pixel configurations in different time frames. This allows the display to present different viewing angle optimizations at different times, effectively adding a time dimension to the spatial pixel structure without increasing the physical pixel count.
3Object-affected harmful factors
If original signals are separately input and processed at two time frames for different viewing angles, then color shifting can be compensated, but display flicker occurs during transition
Solution Approach 1:
The patent merges the display of different viewing angle optimizations into a single time frame by using multiple sub-pixels within the same pixel structure. This eliminates the need for sequential time frame transitions and reduces flicker while maintaining color shifting compensation.
Solution Approach 2:
The display system pre-calculates and stores different luminance values for different sub-pixels corresponding to different viewing angles. This preliminary preparation allows the system to switch between viewing angle optimizations without temporal transitions, eliminating flicker during the switching process.
4Object-affected harmful factors
If gray scales of pixels are adjusted to maintain luminance consistency, then color shifting is reduced, but device complexity increases
Solution Approach 1:
The patent adjusts the gray scale (luminance) parameters of different sub-pixels to compensate for viewing angle differences. By changing the luminance parameter of each sub-pixel based on its optimized viewing angle, the system reduces color shifting without requiring complex structural modifications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively minimizes color shifting and maintains consistent luminance across viewing angles, enhancing display quality by adjusting gray scales in both the time and space domains, ensuring that the adjusted frame approximates the original frame's luminance characteristics.
Implementation Method 1
There are differences in luminance with respect to LCD panel 100 as it is viewed from its front and sides, since retardation values differ for light entering into the liquid crystal material at different angles
Data Source
AI summary
A system comprises a liquid crystal display viewable from front and side view points, and comprising a plurality of pixels having corresponding original luminance values, a plurality of data lines in the display, a plurality of data drivers for driving the data lines, and an adjusted gray scale generator for adjusting gray scales of the pixels and outputting adjusted gray scales to the data drivers for driving the data lines.