ADS Display Electrode Layout for Symmetric VT Curves
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Solution Overview
Problem
The asymmetry of the voltage-transmittance (VT) curve in ADS display mode of liquid crystal display panels due to non-uniform electric field distribution leads to decreased transmittance, flickering, and image sticking or flicker drift, caused by the flexoelectric effect of liquid crystal molecules.
Innovation Solution
A display substrate design with alternately arranged electrode strips on the lower and upper electrodes, ensuring uniform electric field distribution by spacing and connecting electrode strips in specific configurations, including comb-shaped connection parts, to form a symmetrical electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional electrode structures are used in ADS display mode, then the display can operate in plane electric field mode, but the electric field distribution becomes non-uniform causing asymmetric VT curve
Solution Approach 1:
The electrode structure is divided into multiple electrode strips (first, second, third, and fourth electrode strips) arranged alternately. This segmentation allows the electric field to be distributed more uniformly across the liquid crystal cell by creating multiple discrete field regions rather than a single continuous field, thereby reducing the asymmetry in the VT curve while maintaining ADS display mode operation.
Solution Approach 2:
The patent introduces asymmetric spacing between adjacent electrode strips (different spacing values for different electrode strip pairs) to compensate for the inherent asymmetry in the liquid crystal cell structure. This controlled asymmetry in electrode arrangement counteracts the flexoelectric effect-induced asymmetry, achieving a more symmetric VT curve while preserving the ADS display functionality.
2Manufacturing precision
If electrode strips are spaced apart to form uniform electric field, then VT curve symmetry improves, but device complexity increases
Solution Approach 1:
The electrode structure is divided into multiple electrode strips (first, second, third, and fourth electrode strips) arranged alternately. This segmentation allows the electric field to be distributed more uniformly across the liquid crystal cell by creating multiple discrete field regions rather than a single continuous field, thereby reducing the asymmetry in the VT curve while maintaining ADS display mode operation.
Solution Approach 2:
The patent transitions from a conventional single-layer electrode structure to a multi-layer alternating electrode strip configuration. By arranging electrode strips in alternating layers (lower electrode strips and upper electrode strips) with specific spacing, the solution addresses the VT curve asymmetry in a three-dimensional space, achieving uniform electric field distribution while managing structural complexity through systematic layering.
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 solution addresses the asymmetry of the VT curve, improving display transmittance and reducing flickering and image sticking by ensuring a uniform electric field distribution, thereby enhancing the display effect.
Implementation Method 1
When positive and negative frames are changed, liquid crystal molecules are distorted and deformed due to the flexoelectric effect of the liquid crystal
Data Source
AI summary
A display substrate, where each sub-pixel includes lower and upper electrodes on a base substrate; the lower electrode includes multiple first and second electrode strips; the upper electrode includes multiple third and fourth electrode strips; the first and third electrode strips are electrically connected together; the second and fourth electrode strips are electrically connected together; two adjacent electrode strips in the first and/or second electrode strips are mutually spaced apart; two adjacent electrode strips in the third and/or fourth electrode strips are mutually spaced apart; M sequentially adjacent first electrode strips and N sequentially adjacent second electrode strips are alternately arranged; M sequentially adjacent third electrode strips and N sequentially adjacent fourth electrode strips are alternately arranged; M=1, 2, 3, . . . ; N=1, 2, 3, . . . ; M and N are integers; and orthographic projections of the electrode strips of the upper and lower electrodes on the base substrate are alternately arranged.