LCD Branch Electrode Angles for Transmittance and Stain Reduction
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with display deterioration such as texture and stains, and low transmittance due to the orientation of liquid crystal molecules at the edges of branch electrodes, which can be exacerbated by pressure on the display panel.
Innovation Solution
The design includes a liquid crystal display with field generating electrodes where one electrode is rectangular and the other has a plurality of branch electrodes with different angle portions, and a light blocking member is positioned over the curved end of the branch electrodes to minimize transmittance decrease near the edges, optimizing the orientation of liquid crystal molecules for improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If branch electrodes are used to increase aperture ratio, then transmittance is improved, but liquid crystal molecule orientation at edges causes texture and stains
Solution Approach 1:
The branch electrodes are designed with different inclination angles at different locations: the first inclination angle at the first edge portion and the second inclination angle at the second edge portion. This local variation in electrode geometry optimizes liquid crystal molecule orientation at each edge region, preventing texture and stains while maintaining high transmittance through the aperture ratio enhancement provided by the branch structure.
2Strength
If pressure is applied to the display panel, then compactness is improved, but liquid crystal molecules cannot recover causing stains
Solution Approach 1:
The different inclination angles of branch electrodes at opposite edges create asymmetric electrode geometries that provide recovery pathways for liquid crystal molecules. When pressure is applied, the molecules can realign along the inclined electrode edges, and when pressure is released, the asymmetric geometry facilitates molecule recovery to their original orientation, preventing permanent stains.
3Ease of manufacture
If conventional rectangular electrodes are used, then manufacturing is simple, but transmittance is reduced due to edge effects
Solution Approach 1:
The conventional rectangular electrode is segmented into multiple branch electrodes with different inclination angles at different edges. This segmentation allows each edge portion to be optimized independently for liquid crystal molecule orientation, reducing edge effects and improving overall transmittance while maintaining compatibility with standard thin film transistor fabrication processes.
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 reduces display deterioration, increases transmittance, and maximizes the aperture ratio, enhancing the overall performance and durability of the liquid crystal display.
Implementation Method 1
A voltage is applied to the field generating electrodes to generate an electric field in the liquid crystal layer, and thereby control the orientation of liquid crystal molecules of the liquid crystal layer
Implementation Method 2
a light blocking member formed on the first substrate or the second substrate
Data Source
AI summary
The present invention relates to a liquid crystal display including: a first substrate and an opposing second substrate; a liquid crystal layer interposed between the first substrate and the second substrate; a light blocking member disposed on the first substrate or the second substrate; a first field generating electrode disposed on the first substrate; a second field generating electrode disposed on the first substrate and including branch electrodes overlapping the first field generating electrode; and a gate line disposed on the first substrate and extending in a first direction. A branch electrode of the branch electrodes includes a central portion and a first edge portion disposed at one end of the central portion. A first angle formed between the first edge portion and a second direction is greater than a second angle formed between the second direction and the central portion, the second direction being perpendicular to the first direction.