Liquid Crystal Display Electrode Asymmetry for Response Stability
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Solution Overview
Problem
Liquid crystal display devices in high-speed response mode face issues with unwanted electric fields causing undesired alignment changes in the liquid crystal layer, leading to degraded display quality due to rotational asymmetry near slits in the electrodes.
Innovation Solution
The liquid crystal display device incorporates a unique electrode structure with a first electrode in one layer and a common electrode in another, featuring connective and branch areas with inclined sides to generate a rotational asymmetry that stabilizes liquid crystal alignment, reducing unwanted electric field effects and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a slit is provided in the electrode to rotate liquid crystal molecules in opposite directions for high-speed response, then the speed of response is improved, but unwanted electric fields are generated that cause undesired alignment changes
Solution Approach 1:
The patent applies asymmetry by making the first electrode extend only in specific subpixel areas rather than uniformly across all subpixels. This asymmetric electrode configuration creates a controlled electric field distribution that generates rotational asymmetry near the slit, stabilizing liquid crystal alignment in the first direction while maintaining high-speed response characteristics.
Solution Approach 2:
The patent implements local quality by providing the first electrode selectively in different subpixel areas rather than uniformly. The electrode is configured to extend in connective and branch areas within specific subpixels, creating localized electric field effects that stabilize alignment where needed while avoiding unwanted effects in other areas.
2Reliability
If electrodes are configured to generate rotational asymmetry for stable alignment, then alignment stability is improved, but device structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the display area into different subpixel areas with distinct electrode configurations. The first electrode is segmented to extend only in specific subpixel areas with connective and branch areas, rather than being a continuous uniform structure across all subpixels. This segmentation achieves alignment stability through localized electric field control while managing overall device complexity.
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 enhances the speed and stability of liquid crystal molecule rotation, resulting in improved display quality by minimizing light leaks and maintaining uniform alignment, thus reducing color mixing and enhancing contrast.
Implementation Method 1
a second electrode which faces the first electrode via an insulating layer, and generates an electric field for the liquid crystal molecules rotation between the first electrode and the second electrode
Implementation Method 2
The alignment of the liquid crystal molecules of the liquid crystal layer is controlled using the lateral electric field generated between the electrodes
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes first and second electrodes. A subpixel area includes a first area in which the first electrode is formed, and a second area in which the first electrode is not formed. The first area includes a connective area extending in first directions, and branch areas extending from the connective area. The subpixel areas include a first and second subpixel areas. The first directions intersect with second directions. Each of the branch areas extends from the connective area in the second direction 2A in the first subpixel area, and each of the branch areas extends from the connective area in the second direction 2B in the second subpixel area.