Pixel Electrode Segmentation for LCD Transmittance and Viewing Angle
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Solution Overview
Problem
Large size LCD panels face issues with transmittance reduction and dark line appearance due to excessive fringe field effects, which affect display quality, especially during high grayscale image display.
Innovation Solution
A pixel structure with a first substrate, a second substrate, a liquid crystal layer, a patterned first pixel electrode, an insulation layer, and a second pixel electrode, where the liquid crystal molecules in different alignment regions have distinct alignment directions, and the insulation layer and second pixel electrode help mitigate fringe field distortions by providing an isolation effect and equipotential surface variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plurality of branch electrodes are formed in each pixel to achieve wide viewing angle function, then the viewing angle characteristic is improved, but the fringe field effect becomes excessive causing dark lines and reduced transmittance
Solution Approach 1:
The pixel electrode is divided into multiple branch electrodes extending in different directions, with each branch electrode having a specific orientation to control liquid crystal alignment in corresponding alignment regions. This segmentation allows different portions of the pixel electrode to independently influence liquid crystal molecules in different directions, achieving wide viewing angle while controlling fringe field effects through proper branch design and spacing.
Solution Approach 2:
Different regions of the pixel electrode are designed with different properties - the branch electrodes in different alignment regions have different orientations and configurations to create localized electric field distributions that match the required liquid crystal alignment directions. This local quality variation ensures optimal performance in each region while minimizing overall fringe field distortion.
2Area of stationary object
If the LCD panel size is increased, then the display area is improved, but the transmittance decreases due to excessive fringe field effects
Solution Approach 1:
The pixel electrode structure is segmented into multiple branch electrodes with specific orientations, which distributes the electric field more evenly across the pixel area. This segmentation reduces concentrated fringe field effects at electrode edges, thereby improving light transmittance while maintaining large display area coverage.
Solution Approach 2:
The branch electrodes are designed to extend in multiple directions (different spatial dimensions) rather than a single direction, creating a three-dimensional electric field distribution pattern. This dimensional approach allows the electric field to more uniformly penetrate the liquid crystal layer across the entire pixel area, improving transmittance while maintaining large display area.
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 improves transmittance and reduces dark line formation, enhancing display quality by minimizing irregular liquid crystal molecule arrangements and electric field distortions, particularly under high voltage operations.
Implementation Method 1
Under the electric field formed by the voltage difference of the pixel electrode and the common electrode, the liquid crystal molecules can be driven to provide display function
Implementation Method 2
the insulation layer and second pixel electrode help mitigate fringe field distortions by providing an isolation effect
Data Source
AI summary
A pixel structure of display panel includes a first substrate, a second substrate, a liquid crystal layer, a first pixel electrode, a patterned insulation layer, a second pixel electrode and a common electrode. The first substrate has a plurality of alignment regions. The second substrate and the first substrate are disposed opposite to each other. The first pixel electrode is a full-surfaced electrode, which includes a plurality of branch electrodes disposed in the alignment regions. The patterned insulation layer is disposed between the first pixel electrode and the liquid crystal layer. The second pixel electrode is disposed in at least one boundary of each of the alignment regions. The common electrode is disposed on the second substrate.