Parallelogram Pixel Electrodes for Bending-Resistant LCD Side Visibility
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in maintaining wide viewing angles and response speed due to the formation of undesirable textures when bent, particularly in vertical alignment mode, where minute slits and protrusions can lead to misalignment of liquid crystal molecules.
Innovation Solution
The design incorporates a pixel electrode with diagonally oriented, parallelogram-shaped center electrodes and branching extensions, along with a common electrode featuring horizontal openings that align with the bending direction, preventing texture formation and improving side visibility by ensuring liquid crystal molecules are arranged in various directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If minute slits and protrusions are formed in the field generating electrode to diversify tilt directions of liquid crystal molecules, then wide viewing angle is achieved, but response speed deteriorates and undesirable texture is displayed
Solution Approach 1:
The pixel electrode is segmented into multiple branch electrodes extending in different directions from a center electrode. This segmentation creates multiple electric field directions that guide liquid crystal molecules to tilt in various directions, achieving wide viewing angle without using minute slits that would slow response
Solution Approach 2:
The branch electrodes are designed with asymmetric extensions in specific directions (e.g., diagonal and perpendicular orientations) rather than uniform circular symmetry. This asymmetric arrangement creates predetermined tilt directions that diversify liquid crystal orientation, improving viewing angle while maintaining response speed by avoiding the need for complex minute slit patterns
2Adaptability or versatility
If minute slits are formed in the field generating electrode to control liquid crystal tilt directions, then viewing angle is improved, but texture resistance deteriorates when bent
Solution Approach 1:
The alignment structure is designed with local quality variations through branch electrodes with different extension directions. Each region has tailored electric field orientations that locally control liquid crystal tilt directions, achieving diverse orientation without the uniform constraint of minute slits that causes texture issues during bending
Solution Approach 2:
The branch electrode configuration allows the liquid crystal molecules to dynamically adjust their tilt directions based on the electric field distribution from multiple branch directions. This dynamic adaptability enables the display to maintain good viewing characteristics and resist texture formation even when bent, as the molecules can reorient more flexibly compared to rigid minute slit constraints
3Adaptability or versatility
If branch electrodes are added to the pixel electrode to diversify tilt directions, then side visibility is improved, but device complexity increases
Solution Approach 1:
The pixel electrode combines the center electrode and multiple branch electrodes into a single integrated conductive structure. This merging approach achieves diversified tilt directions through the branch extensions while simplifying manufacturing compared to using separate minute slits and protrusions, reducing overall device complexity despite the enhanced side visibility functionality
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 maintains image quality and side visibility even when the LCD is bent, as the specific electrode shapes and openings prevent misalignment of liquid crystal molecules, thus avoiding the undesirable texture issues associated with bending.
Implementation Method 1
controlling polarization of incident light
Implementation Method 2
a liquid crystal layer interposed between the lower and upper panels
Data Source
AI summary
A liquid crystal display (LCD) according to an exemplary embodiment of the present invention includes: a lower panel having a pixel electrode including at least one unit pixel electrode; an upper panel having a common electrode including at least one unit common electrode; and a liquid crystal layer interposed between the lower and upper panels. The unit pixel electrode includes an at least approximately diagonally oriented and parallelogram-shaped center electrode, and further includes a plurality of branches extending from the center electrode, and the common electrode includes an opening extending in a first direction corresponding to a direction of bending of the LCD.