Liquid Crystal Display Comb Electrode Slit Pitch Optimization
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving high response speed and orientation stability across sub-pixels for improved display quality, particularly in ensuring uniform response speed and orientation stability across different color areas.
Innovation Solution
A liquid crystal display device design featuring a first electrode with an electrode base and comb tooth portions extending in different directions, along with varying slit pitches for sub-pixels of different color areas, which enhances the response speed and orientation stability by optimizing the electric field distribution and liquid crystal molecule rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a lateral electric field is used to drive liquid crystal molecules, then the aperture ratio is improved, but the response speed is insufficient
Solution Approach 1:
The first electrode is divided into multiple comb tooth portions with slits between them, creating a segmented structure that generates multiple electric field lines. This segmentation allows the electric field to act more effectively on liquid crystal molecules across the aperture area, improving response speed without reducing aperture ratio.
Solution Approach 2:
The comb tooth portions are designed with specific dimensions and spacing to create localized electric field enhancements at critical positions. By optimizing the local electric field distribution in different regions of the pixel, the invention achieves uniform response speed across the entire aperture area while maintaining high aperture ratio.
2Speed
If the liquid crystal layer thickness is reduced to increase response speed, then the response speed is improved, but the orientation stability of liquid crystal molecules deteriorates
Solution Approach 1:
The comb tooth portions create localized electric field enhancements that provide stronger orienting forces on liquid crystal molecules. This local field enhancement compensates for the reduced overall field strength that would result from thinner liquid crystal layers, maintaining orientation stability while enabling faster response.
Solution Approach 2:
The invention uses a composite electrode structure combining conductive materials with specific geometric patterns (comb teeth). This composite structure generates a unique electric field distribution that simultaneously provides strong enough fields for fast response in thin cells and sufficient uniformity for stable molecular orientation.
3Stability of the object's composition
If different slit pitches are used for different color areas, then the orientation stability is improved, but the device complexity increases
Solution Approach 1:
Different slit pitches are assigned to different color sub-pixels (R, G, B) based on their specific requirements. This local optimization allows each color area to achieve optimal orientation stability and response characteristics, with the complexity managed through systematic design rules rather than arbitrary variations.
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
The design achieves higher response speed and orientation stability across sub-pixels, leading to improved display quality by ensuring uniform response speed and orientation stability across different color areas, thereby enhancing the overall display performance.
Implementation Method 1
a liquid crystal display device that uses an electric field generated in a direction parallel to substrates (lateral direction), that is, a lateral electric field
Implementation Method 2
The lateral-electric-field liquid crystal display device generates an electric field between the first electrode and the second electrode in a direction parallel to the substrate, thereby rotating the liquid crystal molecules in a plane parallel to the substrate surface
Data Source
AI summary
According to an aspect, a liquid crystal display device includes: a first substrate; a second substrate; a liquid crystal layer between the first and second substrates; pixels each including sub-pixels corresponding to different color areas; a first electrode in each sub-pixel; and a second electrode facing the first electrode. The first electrode includes an electrode base portion extending in a first direction; and a plurality of comb tooth portions extending in a second direction from the electrode base portion. A slit pitch of a sub-pixel in one color area and a slit pitch of a sub-pixel in the other color area of at least two color areas out of different color areas are different in size, each slit pitch corresponding to a gap between the comb tooth portions adjacent to each other.