Liquid Crystal Display Device with Varying Electrode Spacing
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Solution Overview
Problem
Vertically aligned mode liquid crystal display devices have lower side visibility compared to front visibility, necessitating an improvement in side visibility while maintaining high contrast ratio and wide viewing angles.
Innovation Solution
The liquid crystal display device incorporates a pixel structure with first and second subpixel electrodes and a common electrode, where the distances between these electrodes differ in various regions, allowing for varying electric field intensities and liquid crystal molecule alignments, thereby enhancing side visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a vertically aligned mode liquid crystal display device is used, then high contrast ratio and wide viewing angles are achieved, but side visibility is reduced
Solution Approach 1:
The patent applies local quality by creating different electrode spacing configurations in different regions of the display. Specifically, the first region has a first spacing between subpixel electrode and common electrode, while the second region has a second spacing that differs from the first spacing. This allows different parts of the display to have optimized characteristics for their respective viewing directions, with some regions optimized for front viewing and others for side viewing, thereby improving overall side visibility while maintaining front viewing quality.
2Illumination intensity
If uniform electrode spacing is used, then manufacturing is simplified, but side visibility cannot be improved
Solution Approach 1:
The patent applies segmentation by dividing the display into multiple regions (first region and second region) with different electrode spacing characteristics. The subpixel electrodes and common electrode are configured with different spacings in different regions, allowing independent optimization of each region for specific viewing directions. This segmented approach enables side visibility improvement without requiring complete redesign of the entire electrode structure.
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 enables improved side visibility by varying the brightness in different regions, effectively addressing the visibility disparity between front and side views while maintaining high contrast and wide viewing angles.
Implementation Method 1
a liquid crystal layer interposed between the electrodes... determines the alignment direction of liquid crystal molecules in the liquid crystal layer to control the polarization of incident light
Implementation Method 2
control the polarization of incident light, thereby displaying desired images
Implementation Method 3
apply voltages to the electrodes to generate an electric field in the liquid crystal layer, which determines the alignment direction of liquid crystal molecules
Data Source
AI summary
A liquid crystal display device includes, a first insulation substrate, a first subpixel electrode disposed on the first insulation substrate, an insulation layer disposed on the first subpixel electrode, a second subpixel electrode disposed on the insulation layer, a liquid crystal layer disposed on the second subpixel electrode, a common electrode disposed on the liquid crystal layer, and a second insulation substrate disposed on the common electrode. In the liquid crystal display device, the second subpixel electrode and the common electrode are spaced apart by a second distance in a second region in which the second subpixel electrode is disposed, the first subpixel electrode and the common electrode are spaced apart by a first distance in a first region in which the first subpixel electrode is disposed, excluding the second region, and the first distance and the second distance are different from each other.