LCD Electrode Pattern Design for Wide Viewing Angles
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Solution Overview
Problem
The manufacturing of liquid crystal displays with alignment aids for pretilt requires additional processing steps and equipment, increasing costs and complexity, while aiming to improve response speed and wide viewing angles.
Innovation Solution
A liquid crystal display design featuring lower and upper panel electrodes with specific patterns and angles between stem parts and center patterns, allowing for improved side visibility and viewing angles without the need for additional manufacturing equipment or processes, by controlling liquid crystal molecule alignment through fringe fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If alignment aids and hardening processes using ultraviolet rays are used to provide pretilt to liquid crystal molecules, then response speed is improved and wide viewing angle is achieved, but manufacturing cost increases and manufacturing process becomes complicated
Solution Approach 1:
The invention extracts and eliminates the alignment aid layer and ultraviolet hardening process from the liquid crystal display manufacturing system. By using only the electrode pattern structure to generate fringe fields for domain formation, the patent removes the need for separate alignment aid materials and photopolymerization equipment, thereby simplifying the manufacturing process while maintaining the ability to achieve wide viewing angles and fast response speeds
Solution Approach 2:
The electrode pattern structure performs the dual function of both generating electric fields for liquid crystal switching and forming domains through fringe fields. The electrode geometry itself serves the alignment function that previously required separate alignment aid materials, making the system self-sufficient and eliminating additional manufacturing steps
2Adaptability or versatility
If alignment aids and additional processing steps are introduced to achieve wide viewing angle, then viewing angle is improved, but manufacturing cost increases
Solution Approach 1:
The invention removes the alignment aid layer and ultraviolet hardening process from the manufacturing system. By relying solely on the electrode pattern structure to generate fringe fields for domain formation, the patent eliminates the need for additional alignment aid materials and photopolymerization equipment, thereby reducing manufacturing costs while maintaining wide viewing angle performance
Solution Approach 2:
The invention changes the geometric parameters of the electrode pattern, specifically using rectangular electrodes with aspect ratios between 2:1 and 4:1. This parameter modification enables the electrode structure itself to generate sufficient fringe fields for effective domain formation, achieving wide viewing angles without requiring additional alignment aid materials or processing steps
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 design achieves high side visibility and wide viewing angles while simplifying the manufacturing process and reducing costs, by effectively controlling liquid crystal molecule alignment without the use of additional alignment aids or complex processing steps.
Implementation Method 1
the plurality of domains may be formed by rearranging the liquid crystal molecules using a fringe field formed between edges of the cutouts and the field generating electrodes facing the edges thereof
Data Source
AI summary
A liquid crystal display, including a lower panel electrode including at least one lower panel unit electrode, an upper panel electrode including at least one upper panel unit electrode facing the at least one lower panel unit electrode, and a liquid crystal layer disposed between the lower panel electrode and the upper panel electrode, wherein the lower panel unit electrode includes a stem part forming borders between a plurality of sub-regions; a center pattern including a plurality of straight line sides respectively disposed at the plurality of sub-regions, and a plurality of fine branch parts extending out from the center pattern, the stem part includes a horizontal stem part and a vertical stem part, and angles that the horizontal stem part and the vertical stem part form with the respective straight line sides of the center pattern are different from each other.