Liquid Crystal Display Device With Inclined Pixel Electrode Slits
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Solution Overview
Problem
Liquid crystal display devices experience increased parallax and moire due to the distance between the black matrix of the front-side display panel and the wiring of the rear-side display panel, leading to visible artifacts when viewed obliquely.
Innovation Solution
A liquid crystal display device configuration with two overlapping panels, where the rear-side panel's pixel electrodes have slits with inclined edges and a light-transmitting material for source and gate lines, ensuring identical rotation directions of liquid crystal molecules across the boundary, reducing the visibility of the rear-side panel's wiring and black matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two display panels are overlapped to improve contrast, then contrast is improved, but parallax increases and moire becomes visible when viewed obliquely
Solution Approach 1:
The patent converts the harmful effect of visible wiring and black matrix into a benefit by designing pixel electrodes with inclined edges that deliberately create moire patterns. These controlled moire patterns mask the unwanted moire caused by the rear panel's wiring, transforming the visual artifact from a harmful interference into a useful camouflage that improves overall display quality while maintaining the high-contrast dual-panel configuration
Solution Approach 2:
The patent applies visual pattern changes through inclined pixel electrode edges that create specific moire patterns. By controlling the inclination angles and patterns of these electrodes, the design changes the visual appearance of the display surface to mask underlying wiring structures, effectively using optical pattern transformation to resolve the visibility issue of rear panel components
2Object-affected harmful factors
If additional diffusion sheets are added to reduce moire, then moire visibility is reduced, but transmittance decreases and device thickness increases
Solution Approach 1:
The patent extracts and eliminates the diffusion sheets from the display structure entirely. Instead of adding diffusion sheets to mask moire, the design uses the inclined pixel electrode edges to generate beneficial moire patterns that mask harmful ones, removing the need for additional optical layers and thereby maintaining high transmittance and reducing device thickness
Solution Approach 2:
The inclined pixel electrode edges serve as an intermediary element that directly addresses the moire visibility issue without requiring additional optical layers. These electrodes act as a built-in masking mechanism that eliminates the need for diffusion sheets, maintaining optical performance while solving the artifact problem
3Illumination intensity
If the distance between front-side black matrix and rear-side wiring increases to accommodate dual panel structure, then contrast improvement is achieved, but parallax increases making rear-side features more visible
Solution Approach 1:
The patent converts the harmful visibility of rear-side wiring into a benefit by using inclined pixel electrode edges to create controlled moire patterns. These patterns serve as visual camouflage that masks the unwanted wiring visibility, allowing the dual-panel structure to maintain its contrast-improving geometry without suffering from artifact visibility issues
Data Source
AI summary
A liquid crystal display device includes: a first display panel displaying a color image; and a second display panel displaying a monochrome image. Each of the first and the second display panels includes: source lines extending in a first direction; gate lines extending in a second direction; pixels; and pixel electrodes. Each of pixel electrodes among at least one of the first display panel and the second display panel, includes slits extending in the first direction. Each of pixel electrodes includes: a first edge and a second edge that are opposed to each other and extend in the first direction; a third edge connecting one ends of the first edge and the second edge; and a fourth edge connecting another ends of the first edge and the second edge. The third edge and the fourth edge are respectively inclined at predetermined angles with respect to the second direction.