LCD Electrode Segmentation for Field Leakage Control
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in maintaining high transmissivity and resolution while avoiding electric field leakage and degradation of display quality, particularly due to misalignment between pixel and common electrodes, which affects viewing angle and color reproducibility.
Innovation Solution
The liquid crystal display device incorporates a specific electrode structure with main and sub-pixel electrodes, and main and sub-common electrodes, arranged to prevent electric field leakage and misalignment, using cutout portions and orthogonal extensions to control the electric field and maintain high transmissivity across various pixel pitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixel electrodes and common electrodes are formed in simple array patterns, then device complexity is reduced and manufacturing is easier, but electric field leakage occurs and display quality deteriorates
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode, second pixel electrode, third pixel electrode) with different orientations. The common electrode is also segmented into multiple regions (first common electrode region, second common electrode region, third common electrode region). This segmentation allows each segment to contribute to different aspects of electric field control, preventing leakage while maintaining manufacturability through systematic patterning.
Solution Approach 2:
Different regions of the electrode structure are assigned different functions and orientations. The first pixel electrode extends in a first direction, the second in a second direction, and the third in a third direction, with each region optimized for specific electric field control requirements. This local differentiation enables precise control of liquid crystal molecules in different areas without requiring complete redesign of the entire electrode structure.
2Manufacturing precision
If electrode alignment is simplified, then manufacturing precision requirements are reduced, but electric field leakage and misalignment occur, degrading viewing angle and color reproducibility
Solution Approach 1:
The electrode structure employs asymmetric orientation arrangements where pixel electrodes and common electrodes are deliberately oriented at different angles relative to each other. The first pixel electrode extends in a first direction while the first common electrode extends in a second direction, creating asymmetric electric field distributions that are optimized to prevent leakage while maintaining alignment tolerance during manufacturing.
3Speed
If lateral electric field switching is used, then response speed is improved, but electric field leakage occurs affecting transmissivity and resolution
Solution Approach 1:
The patent combines multiple electrode segments with different orientations into a unified electrode structure. The first, second, and third pixel electrodes are electrically connected to form a single pixel electrode, while multiple common electrode regions are connected to form a unified common electrode. This merging allows the structure to function as a cohesive unit for lateral electric field switching while the distributed segments prevent field leakage, maintaining both response speed and transmissivity.
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 effectively suppresses electric field leakage, maintains high transmissivity, and ensures high resolution and wide viewing angles by controlling the alignment of liquid crystal molecules, thereby improving display quality and color reproducibility.
Implementation Method 1
Liquid crystal molecules are switched by the lateral electric field substantially in parallel with the principal surface of the array substrate
Implementation Method 2
a liquid crystal layer held between the first substrate and the second substrate and having liquid crystal molecules
Data Source
AI summary
An array substrate includes a pixel electrode having a contact portion, a pair of main pixel electrodes extending in a first direction from the contact portion, and a sub-pixel electrode arranged between the contact portion and an end of the main pixel electrode so as to connect the main pixel electrodes. A counter substrate includes a common electrode having first, second and third main common electrodes. The third main common electrode is arranged substantially in the center between the pair of main pixel electrodes. A sub-common electrode is arranged between the contact portion and the sub-pixel electrode in the first direction. The third main common electrode includes a cutout portion, and the sub-pixel electrode crosses the third main common electrode at the cutout portion. The first sub-common electrode includes cutout portions, and the pair of main pixel electrodes cross the first sub-common electrode at the cutout portions, respectively.