Tri-Electrode LCD Viewing Angle Response Time
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Solution Overview
Problem
Conventional LCD devices, particularly those using the TN mode, suffer from viewing angle variations due to optical path differences, and other modes like MVA, OCB, FFS, and IPS face issues such as long response times, complex manufacturing, mura effects, and high costs, limiting their suitability for various applications.
Innovation Solution
An LCD device employing a tri-electrode structure with negative LC molecules, featuring a pixel electrode and first and second common electrodes arranged at different layers, along with a second common electrode on a separate substrate, which improves viewing angles and response times while breaking the technical monopoly of IPS and FFS modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If compensation films are added to TN mode LCD device, then viewing angle is improved, but gray level inversion phenomenon still exists
Solution Approach 1:
The common electrode is segmented into multiple first common electrodes arranged at different layers, with each layer having different tilt angles. This segmentation allows independent control of electric field distribution in different zones, enabling wide viewing angle without gray level inversion by optimizing local LC molecule alignment in each layer.
Solution Approach 2:
The patent introduces a vertical dimension by arranging common electrodes at multiple layers with different tilt angles (e.g., +30° and -30°). This multi-layer configuration adds a new degree of freedom to the electric field control, allowing the system to achieve both wide viewing angle and eliminate gray level inversion simultaneously.
2Shape
If MVA mode LCD device employs negative LC material and protuberance structure, then viewing angle is improved, but response time becomes long and manufacturing process becomes complicated
Solution Approach 1:
The patent extracts the complex protuberance structure and replaces it with a simplified multi-layer common electrode arrangement. By removing the need for physical protuberances and using instead planar electrodes at different tilt angles, the manufacturing process is simplified while maintaining the multi-domain viewing angle benefit.
Solution Approach 2:
Instead of changing the physical structure (protuberances), the patent changes the parameter of electric field configuration by arranging common electrodes at different tilt angles. This parameter-based approach achieves the same viewing angle improvement without the manufacturing complexity and long response time associated with structural modifications.
3Shape
If VA mode LCD device is used, then viewing angle is improved, but mura effect is generated when touched
Solution Approach 1:
The patent creates a dynamic electric field configuration through multi-layer common electrodes at different tilt angles. This dynamic field arrangement allows the LC molecules to rotate in multiple directions simultaneously, providing wide viewing angle while the distributed electrode structure prevents localized stress concentration that causes mura effects during touch.
4Productivity
If FFS mode or IPS mode LCD device is used, then viewing angle and response time are improved, but manufacturing cost increases
Solution Approach 1:
The patent creates a universal multi-layer common electrode structure that can be integrated into standard TN mode manufacturing processes. By using the same basic electrode fabrication techniques across multiple layers with different tilt angles, the patent achieves FFS/IPS-like performance (fast response time and wide viewing angle) without requiring separate complex manufacturing lines, thus controlling costs.
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 tri-electrode structure with negative LC molecules enhances viewing angles, reduces response times, and lowers manufacturing complexity and costs, offering improved display performance and flexibility compared to conventional IPS and FFS mode LCD devices.
Implementation Method 1
the gate lines and the data lines are intersected with each other to define a plurality of pixel areas. Each of the pixel areas includes a pixel electrode and a plurality of first common electrodes which are arranged at different layers respectively
Implementation Method 2
Due to the optical anisotropy of the LC molecules, optical paths are different after light beams pass through the LC molecules from different angles and enter human eyes
Data Source
AI summary
A liquid crystal display device includes a first substrate, a second substrate opposite to the first substrate, and a liquid crystal (LC) layer sandwiched between the two substrates. The first substrate includes gate lines and data lines, and the gate lines and the data lines data lines are intersected with each other to define pixel areas. Each of the pixel areas includes a pixel electrode and first common electrodes arranged at different layers, and the first common electrodes are electrically coupled to each other. The second substrate includes a second common electrode, and the LC layer comprises negative LC molecules.