Array Substrate with Segmented Electrodes for High PPI Displays
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Solution Overview
Problem
High PPI liquid crystal display panels, such as TN and ADS types, face issues with light leakage in dark states and color mixing, respectively, which are not adequately addressed by existing technologies.
Innovation Solution
An array substrate with alternating first and second pixel units, separated by a transparent insulating layer, and strategically positioned pixel electrodes that reduce precision requirements for mask plates and prevent light leakage by forming emission angles, thereby eliminating the need for black matrices and reducing color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TN type liquid crystal display panel is used to achieve high PPI, then resolution is improved, but light leakage occurs in dark states
Solution Approach 1:
The pixel electrode layer is divided into two separate layers (first pixel electrode layer and second pixel electrode layer), each containing alternating first pixel electrodes and second pixel electrodes. This segmentation allows independent control of light blocking and light emission functions, preventing light leakage in dark states while maintaining high PPI
Solution Approach 2:
The patent transitions from a single-plane pixel electrode structure to a two-layer stacked structure with transparent insulating layers in between. This dimensional change enables the orthogonal projection arrangement where second pixel electrodes are positioned between first pixel electrodes, achieving both high resolution and effective light leakage prevention
2Measurement precision
If ADS type liquid crystal panel is used to achieve high PPI, then resolution is improved, but color mixing occurs
Solution Approach 1:
The pixel electrodes are segmented into first pixel electrodes and second pixel electrodes arranged in alternating patterns in each layer. This segmentation creates distinct light emission zones that prevent color mixing while maintaining high pixel density
Solution Approach 2:
The transparent insulating layer acts as an intermediary between the first and second pixel electrode layers, providing electrical isolation while allowing light transmission. This enables the orthogonal projection arrangement that prevents color mixing
3Object-generated harmful factors
If black matrix is added to prevent light leakage, then light leakage is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the light leakage prevention function from the traditional black matrix structure and integrates it directly into the pixel electrode arrangement. The alternating first and second pixel electrodes inherently block light in dark states, eliminating the need for separate black matrix components and reducing manufacturing complexity
Data Source
AI summary
An array substrate, a display panel, and a display device. The array substrate includes a plurality of pixel units arranged in a matrix, wherein each row of pixel units includes a plurality of first pixel units and a plurality of second pixel units arranged at intervals. Furthermore, the array substrate further includes: a first pixel electrode layer, a second pixel electrode layer, and a transparent insulating layer between the first pixel electrode layer and the second pixel electrode layer. In the above array substrate, for each row of pixel units, a plurality of first pixel electrodes for the plurality of first pixel units are arranged at intervals in the first pixel electrode layer, and a plurality of second pixel electrodes for the plurality of second pixel units are arranged at intervals in the second pixel electrode layer.