Array Substrate Branch Electrode Configuration for LCD Response Time
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in achieving wide viewing angles and fast response times due to insufficient control of liquid crystals in multi-domain structures, leading to decreased light transmittance and limited driving voltage, which affects display quality.
Innovation Solution
The array substrate design includes specific configurations of pixel electrodes with branch electrode portions arranged to form acute angles and parallel extensions, increasing the area for liquid crystal alignment and polarization axis interaction, allowing for higher driving voltages and improved response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a multi-domain structure is used to improve viewing angle and response time, then liquid crystal alignment is improved, but textures are generated in boundary areas causing decreased light transmittance
Solution Approach 1:
The patent applies local quality by creating different electrode configurations in different regions of the pixel. The first and second pixel electrodes have different patterns of branch electrode portions, with the first pixel electrode having branch portions extending in multiple directions and the second pixel electrode having a complementary pattern. This local differentiation allows each region to contribute differently to liquid crystal alignment, reducing texture formation at boundaries while maintaining overall transmittance.
Solution Approach 2:
The patent employs asymmetry by designing non-uniform electrode patterns where branch electrode portions extend in specific directions (e.g., first direction, second direction, third direction) rather than uniformly in all directions. The asymmetric arrangement of branch electrode portions on opposite sides of the pixel creates intentional non-uniformity that prevents symmetric texture formation, thereby improving light transmittance while maintaining response time performance.
2Speed
If the amplitude of driving voltage is limited due to signal line width, then signal delivery is stable, but voltage potential difference cannot be increased to enhance response time
Solution Approach 1:
The patent applies dimensionality change by transitioning from a single-domain to a multi-domain electrode structure. Instead of increasing voltage amplitude along the same dimension (which is limited by signal line width), the invention creates multiple spatial dimensions for electric field generation through branch electrode portions extending in different directions. This allows the system to achieve enhanced response time through spatial configuration rather than voltage magnitude alone.
Solution Approach 2:
The patent segments the pixel into multiple domains with separate electrode regions (first pixel electrode with first, second, third branch electrode portions and second pixel electrode with fourth, fifth, sixth branch electrode portions). Each segment can be independently controlled, allowing the system to achieve cumulative effect equivalent to higher voltage without actually increasing the amplitude beyond signal line capabilities. The segmented structure enables parallel operation of multiple electrode regions.
3Illumination intensity
If branch electrode portions are arranged to increase liquid crystal alignment area, then transmittance and response time are enhanced, but electrode structure complexity increases
Solution Approach 1:
The patent applies universality by designing branch electrode portions that serve multiple functions simultaneously. The same branch electrode portions that extend in different directions (first, second, third directions) serve both to align liquid crystals in multiple orientations for improved transmittance and to create the multi-domain structure for enhanced response time. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in 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 transmittance and response time, significantly improving display quality by reducing textures and increasing the area for liquid crystal alignment, thereby enabling better light use efficiency and higher voltage application.
Implementation Method 1
When a voltage is applied to the electrodes, an electric field is generated in the liquid crystal layer. An arrangement of liquid crystals in the liquid crystal layer is controlled by the electric field
Implementation Method 2
An arrangement of liquid crystals in the liquid crystal layer is controlled by the electric field, and a transmittance and polarization state of incident light are thereby controlled
Data Source
AI summary
An array substrate includes a first pixel electrode and a second pixel electrode. The first pixel electrode includes first branch electrode portions and second branch electrode portions. The first branch electrode portions are disposed in a first area of a unit pixel area and are substantially parallel to a first side of the unit pixel area. The second branch electrode portions are disposed in a second area of the unit pixel area and are substantially parallel to a second side of the unit pixel area. The second pixel electrode includes third branch electrode portions disposed between the first branch electrode portions and fourth branch electrode portions disposed between the second branch electrode portions.