Curved Display Array Substrate Electrode Segmentation
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Solution Overview
Problem
Curved liquid crystal display panels experience uneven light leakage due to inconsistent displacements in local regions, leading to adverse impacts on display quality, as the electrode and light-shielding patterns on the substrate undergo relative displacements when the panel is curved.
Innovation Solution
An array substrate with pixel regions divided into multiple alignment regions, each with electrodes extending in different directions, and a gap between them, which helps maintain liquid crystal molecule alignment and reduces the impact of edge electric fields, thereby mitigating light leakage and improving brightness uniformity and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the liquid crystal display panel is curved to improve viewing effect and sense of presence, then the viewing effect is improved, but uneven light leakage occurs due to inconsistent displacements in local regions
Solution Approach 1:
The pixel electrode is divided into multiple sub-electrodes (first electrode and second electrode) that are separated by gaps. Each sub-electrode independently controls the liquid crystal molecules in its region, allowing for localized adjustment of the electric field distribution. This segmentation prevents the formation of disclination lines and reduces light leakage at electrode edges, thereby improving light leakage uniformity while maintaining the curved display's viewing effect.
Solution Approach 2:
Different regions of the display panel are provided with different electrode structures and gap widths. The gap width between sub-electrodes is specifically designed to be less than the width of alignment regions to optimize the electric field distribution in high-stress areas. This local optimization ensures that each region of the curved display has appropriate light leakage control characteristics, improving overall uniformity while maintaining the curved form factor.
2Adaptability or versatility
If the panel is curved, then viewing effect is improved, but electrode and light-shielding pattern have relative displacements causing uneven light leakage
Solution Approach 1:
By segmenting the pixel electrode into multiple sub-electrodes with gaps between them, the invention eliminates the formation of continuous disclination lines that would cause uneven light leakage. The gaps prevent liquid crystal molecules from twisting at electrode edges, maintaining display quality reliability even when the panel is curved and subjected to mechanical stress.
Solution Approach 2:
The gap between sub-electrodes acts as an intermediary region that mediates the electric field distribution. This gap region prevents direct interaction between adjacent electrodes that would otherwise create edge effects and disclination lines. By introducing this intermediary space, the invention maintains consistent light leakage characteristics across the entire curved display surface.
3Manufacturing precision
If alignment regions are created with different alignment directions, then liquid crystal molecule alignment is maintained, but device complexity increases
Solution Approach 1:
The pixel electrode is segmented into sub-electrodes that can be formed using standard thin-film deposition and patterning processes. Each sub-electrode creates a distinct alignment region, but the overall structure is achieved through conventional manufacturing techniques, balancing alignment precision requirements with manufacturing feasibility.
Solution Approach 2:
Different alignment directions are implemented only where needed - specifically in the alignment regions between sub-electrodes. The gap widths are locally optimized to be less than the width of alignment regions to control the electric field distribution. This localized approach to creating multiple alignment directions minimizes the increase in device complexity while achieving the desired alignment precision.
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 effectively prevents liquid crystal molecule twisting and reduces the impact of disclination lines, resulting in improved display brightness uniformity and transmittance, even when the panel is curved, by using a 4-domain wide-viewing-angle structure with specific electrode arrangements and gap widths.
Implementation Method 1
each pixel electrode includes a first electrode and a second electrode. The first electrode includes a first main electrode extending in a second direction, and the first main electrode divides the first sub-pixel region into a first alignment region and a second alignment region
Implementation Method 2
alignment directions of the first, the second, the third, and the fourth alignment regions are mutually different
Implementation Method 3
The first electrode and the second electrode are separated by a gap, and a width of the gap in the first direction is less than a width of one of the first, the second, the third, and the fourth alignment regions in the first direction
Data Source
AI summary
An array substrate includes a plurality of pixel regions and a plurality of pixel electrodes. Each pixel region includes a first sub-pixel region and a second sub-pixel region. Each pixel electrode includes a first electrode disposed in the first sub-pixel region and a second electrode disposed in the second sub-pixel region. The first electrode includes a first main electrode dividing the first sub-pixel region into a first alignment region and a second alignment region. The second electrode includes a second main electrode dividing the second sub-pixel region into a third alignment region and a fourth alignment region. The first, the second, the third, and the fourth alignment regions are sequentially arranged in a first direction. The first electrode and the second electrode are separated by a gap, and a width of the gap in the first direction is less than a width of one of the first, the second, the third, and the fourth alignment regions in the first direction.