Stacked LCD Panel Asymmetry for Oblique Viewing Alignment
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Solution Overview
Problem
Liquid crystal display (LCD) devices with stacked panels suffer from image displacement when viewed from oblique angles due to misalignment of corresponding color and contrast pixels, leading to poor image quality.
Innovation Solution
The solution involves using larger contrast pixels in the second display panel compared to color pixels in the first panel, with a size ratio of 1.003 to 1.150 times longer and 1.006 to 1.323 times larger in area, along with a control device to switch image processing modes based on viewing position and an adjuster device to adjust panel positions for optimal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two or more LCD panels are stacked to improve contrast ratio, then the contrast ratio is improved, but image displacement occurs when viewed from oblique angles due to the gap between panels
Solution Approach 1:
The patent applies asymmetry by making the contrast pixels larger than the color pixels. Specifically, the contrast pixel size is designed to be 1.003 to 1.150 times longer and 1.006 to 1.323 times larger in area than the color pixel size. This asymmetric design compensates for the image displacement caused by the gap between stacked panels, allowing the larger contrast pixels to cover the positional mismatch while maintaining high contrast ratio.
2Manufacturing precision
If the gap between stacked panels is minimized to reduce image displacement, then pixel alignment is improved, but the gap cannot be completely eliminated due to component requirements
Solution Approach 1:
The patent changes the parameter of pixel size, specifically making contrast pixels larger than color pixels. This parameter change allows the system to tolerate the unavoidable gap between panels while maintaining acceptable alignment. The enlarged contrast pixels act as a buffer that covers the positional displacement caused by the gap, eliminating the need to minimize the gap to zero.
3Manufacturing precision
If larger contrast pixels are used to compensate for image displacement, then image quality is maintained when viewed from oblique angles, but the area of the second display panel increases
Solution Approach 1:
The patent applies local quality by making only the contrast pixels larger, while the color pixels remain at their original size. This localized change in pixel size affects only the second display panel's contrast layer, providing the necessary compensation for image displacement without requiring a proportional increase in the entire display system's area. The enlargement is precisely controlled within the range of 1.003 to 1.150 times the color pixel dimensions.
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
This configuration mitigates image displacement and maintains high contrast ratio, ensuring sharper images and reduced double image formation when viewed from various angles by adjusting pixel sizes and processing modes, and repositioning panels for alignment.
Implementation Method 1
A common electrode and a pixel electrode are provided for each pixel or sub-pixel, applying an electric field to the liquid crystal
Implementation Method 2
The driving circuits switch the alignment of the liquid crystal modifying the direction of incident light
Implementation Method 3
Each display panel may be composed of polarizers, a layer of thin film transistors
Implementation Method 4
the first display panel is comprised of color pixels that filter color
Data Source
AI summary
A liquid crystal display device is disclosed utilizing two or more display panels stacked on top of each other. In a dual panel configuration, the first display panel may be comprised of color pixels and the second display panel may be comprised of contrast pixels. The color pixel in the first display panel has a corresponding contrast pixel in the second display panel wherein said contrast pixel is larger in terms of length and in size than the corresponding color pixel. The liquid crystal display device may also switch to a mode that uses an expansion method of contrast pixels to reduce image displacement. Further disclosed is a configuration where the relative position of the first display panel and the second display panel may be adjusted to align the corresponding color and contrast pixels when viewing the display in oblique angles.