Liquid Crystal Display Device Three-Electrode Structure
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Solution Overview
Problem
FFS-mode liquid crystal display devices have slow response times due to reliance on viscoelasticity during fall time, resulting in low contrast ratio and viewing angle limitations, and the existing electrode structure does not adequately address these issues.
Innovation Solution
A liquid crystal display device with a lower substrate featuring a pair of comb-shaped electrodes, where the third electrode has a larger average width and branch portion length than the second electrode, allowing for three distinct voltage levels and alternating electric field directions to enhance response speed and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional FFS-mode electrode structure with two electrodes is used, then the device achieves a wide viewing angle, but the response time is slow due to reliance on viscoelasticity during fall time
Solution Approach 1:
The electrode structure is segmented into three distinct electrodes (first electrode, second electrode, and third electrode) arranged in alternating layers. This segmentation allows independent control of electric fields in different regions and time periods, enabling accelerated response by applying electric fields during both rise time and fall time rather than relying solely on viscoelasticity during fall time
Solution Approach 2:
The invention transitions from a two-electrode planar structure to a three-electrode layered structure with alternating arrangements. This dimensional change enables the application of electric fields from multiple directions and layers, creating more complex field patterns that accelerate liquid crystal response while maintaining wide viewing angle characteristics
2Reliability
If the third electrode has larger average width and branch portion length than the second electrode, then the electric field strength and alignment stability are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The invention applies local quality by making the third electrode have a larger average width and branch portion length compared to the second electrode. This asymmetric design creates stronger electric fields in specific regions where needed, improving alignment stability and response characteristics, while the gradual transition in dimensions helps manage manufacturing precision requirements
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 achieves a high-contrast ratio, wide viewing angle, and faster response times by utilizing a stronger electric field and improved alignment stability, outperforming traditional FFS-mode devices.
Implementation Method 1
in fall time, causes the liquid crystal to make a response using only viscoelasticity by stopping the application of the electric field
Implementation Method 2
by applying an electric field by using a plurality of electrodes
Implementation Method 3
pixel electrode, made of a transparent conductor, arranged in each unit pixel to generate a fringe field together with the counter electrode
Data Source
AI summary
In the present invention, a liquid crystal display device capable of achieving a high contrast ratio and a wide viewing angle, and capable of achieving a high-speed response is provided. The liquid crystal display device in the present invention is configured such that, when viewed in a plan view, at least one contour line of a plurality of linear portions of a first electrode intersects with a branch portion of a second electrode and a branch portion of a third electrode adjacent to each other, a length of a part intersecting with the branch portion of the third electrode is longer than a length of a part intersecting with the branch portion of the second electrode, and a driving operation is performed such that a potential difference between the first electrode and the third electrode is equal to or greater than a potential difference between the first electrode and the second electrode.