LCD Pixel Electrode Structure for Wide Viewing Angle and High Transmittance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display (LCD) panels face challenges with narrow viewing angles and long response times, particularly due to low transmittance in the domain boundary region, which affects image contrast.
Innovation Solution
A pixel electrode structure with alternating branch domain electrodes arranged at specific angles to create electric fields that drive liquid crystal molecules to twist, increasing transmittance and contrast by optimizing the electrode pattern in the domain boundary region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-domain horizontal alignment (MHA) LCD is used to increase viewing angle, then viewing angle is improved, but transmittance in domain boundary region deteriorates and image contrast becomes low
Solution Approach 1:
The pixel electrode is segmented into multiple electrode patterns including first and second main electrodes, first and second branch electrodes, and first and second sub-branch electrodes. This segmentation creates multiple domains within each pixel, allowing different viewing angle characteristics in different regions while maintaining good transmittance through optimized electrode geometry and arrangement.
Solution Approach 2:
Different regions of the pixel electrode are designed with different local characteristics. The main electrodes provide primary domain structure, while branch and sub-branch electrodes create secondary domains specifically in boundary regions. This local quality variation ensures that domain boundary areas have optimized electrode density and arrangement to maintain transmittance while achieving wide viewing angles.
2Adaptability or versatility
If electrode pattern is restricted to create multiple domains, then viewing angle is improved, but liquid crystal molecules between adjacent domains are not driven to twist
Solution Approach 1:
The electrode pattern is divided into hierarchical segments: main electrodes create primary domains, branch electrodes create secondary domains, and sub-branch electrodes create tertiary domains. This multi-level segmentation ensures that even liquid crystal molecules in boundary regions between any adjacent domains are within driving distance of at least one electrode, enabling effective electric field application and maintaining fast response times.
Solution Approach 2:
The electrode structure extends in multiple spatial dimensions with main electrodes arranged in one direction and branch/sub-branch electrodes extending in perpendicular directions. This multi-dimensional electrode arrangement ensures comprehensive coverage of the pixel area, allowing electric fields to reach liquid crystal molecules in all regions including domain boundaries, thus improving response time while maintaining multi-domain viewing angle characteristics.
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 solution enhances transmittance and image contrast by ensuring liquid crystal molecules in the domain boundary region are driven by electric fields, thereby improving the viewing angle and response time of LCD panels.
Implementation Method 1
The IPS LCD generates a lateral electric field between the pixel electrode and the common electrode to drive the liquid crystal molecules to twist horizontally
Data Source
AI summary
A pixel electrode structure including a first electrode and a second electrode is provided. The first electrode has a first stripe electrode extended along a first direction and pleural first branch electrodes connected to the first strip electrode. The first branch electrodes include pleural first branch domain electrodes extended along a second direction and pleural second branch domain electrodes extended along a third direction substantially perpendicular to the second direction. The second electrode has a second stripe electrode extended along the first direction and pleural second branch electrodes connected to the second stripe electrode. The second branch electrodes include pleural third branch domain electrodes extended along the second direction and pleural fourth branch domain electrodes extended along the third direction. The first and the third branch domain electrodes are alternated to each other. The second and the fourth branch domain electrodes are alternated to each other.