Branched Pixel Electrode for Wide Viewing Angle
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Solution Overview
Problem
Liquid crystal displays face challenges in achieving a wide viewing angle and rapid response speed while maintaining a high open ratio, as existing designs often compromise on these factors due to the configuration of electrodes and liquid crystal molecule alignment.
Innovation Solution
The design incorporates a branched pixel electrode and a cross-shaped opening in the common electrode, along with a method to pretilt liquid crystal molecules using a polymerized prepolymer, to control the alignment and direction of liquid crystal molecules, enhancing viewing angle and response speed while increasing the open ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cutouts or openings are formed on the field generating electrode to ensure light viewing angle, then viewing angle is improved, but open ratio is decreased
Solution Approach 1:
The pixel electrode is divided into multiple branch electrodes extending in different directions, creating multiple tilt regions that disperse liquid crystal molecule tilt directions. This segmentation allows the electrode structure to control viewing angle without requiring additional cutouts that would reduce the open ratio
Solution Approach 2:
Different regions of the pixel electrode are designed with different orientations (branch electrodes in vertical, horizontal, and diagonal directions) to create localized tilt regions. Each region provides specific tilt control, and the combination achieves wide viewing angle while maintaining high open ratio by avoiding unnecessary openings
2Speed
If liquid crystal molecules are aligned vertically in no electric field state (VA mode), then response speed is improved, but viewing angle is limited without additional cutouts
Solution Approach 1:
The pixel electrode is segmented into branch electrodes oriented in multiple directions, creating distinct tilt regions. This segmentation enables liquid crystal molecules to be tilted in different directions in different regions, achieving wide viewing angle while maintaining the vertical alignment baseline for fast response speed
Solution Approach 2:
The branch electrodes are arranged asymmetrically in multiple directions (vertical, horizontal, diagonal) to create controlled asymmetry in liquid crystal tilt directions. This asymmetric arrangement disperses tilt directions to improve viewing angle while the underlying vertical alignment structure preserves rapid response 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
This configuration results in improved transmittance and visibility, with increased viewing angle and response speed, and maintains high transmittance even at the edges of the pixel area, effectively addressing the limitations of previous designs.
Implementation Method 1
a method to pretilt liquid crystal molecules using a polymerized prepolymer
Implementation Method 2
The liquid crystal display generates electric fields in the liquid crystal layer by applying voltage to the field generating electrodes, and determines the direction of liquid crystal molecules of the liquid crystal layer by the generated electric field
Implementation Method 3
determines the direction of liquid crystal molecules of the liquid crystal layer by the generated electric field, thus controlling polarization of incident light so as to display images
Data Source
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AI summary
A liquid crystal display according to an exemplary embodiment of the present invention includes a first substrate, a pixel electrode (191) disposed on the first substrate, a first alignment layer disposed on the first substrate and the pixel electrode, a second substrate facing the first substrate, a common electrode disposed on the second substrate, a second alignment layer disposed on the second substrate and the common electrode, and a liquid crystal layer disposed between the first substrate and the second substrate, in which the common electrode has a first opening (271) having a cross shape, an edge of the first opening protrudes beyond an edge of the pixel electrode (191), and the pixel electrode includes a second opening (91) disposed adjacently to at least one of the edges of the pixel electrode.