LCD Pixel Electrode Slit Design for Misalignment Compensation
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with texture phenomena and reduced transmittance due to misalignment during the bonding process of substrates, leading to suboptimal display performance.
Innovation Solution
The design incorporates a pixel electrode with subpixel electrodes and a common electrode featuring interconnected slit portions on both substrates, which helps to minimize misalignment effects and maintain high transmittance by ensuring proper alignment and electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional pixel electrode and common electrode structure is used, then the manufacturing process is simple, but texture phenomena occur and transmittance is reduced due to misalignment during substrate bonding
Solution Approach 1:
The common electrode is segmented into multiple regions with different slit patterns (first common electrode region with first slits, second common electrode region with second slits). This segmentation allows different regions to compensate for misalignment in different directions, improving overall alignment precision and reducing texture phenomena without requiring a completely new electrode structure
Solution Approach 2:
Different regions of the common electrode are designed with different slit orientations and patterns tailored to their specific alignment requirements. The first common electrode region has slits oriented to compensate for misalignment in one direction, while the second region has slits oriented for compensation in another direction, optimizing local alignment quality
2Manufacturing precision
If the slit portions of the common electrode are designed to overlap with subpixel electrodes, then alignment precision is improved, but the device complexity increases due to the need for precise pattern design
Solution Approach 1:
The common electrode is divided into multiple regions with different slit patterns that can be independently designed and manufactured. This segmentation allows each region to be optimized for specific alignment requirements without complicating the entire electrode structure, as each segment follows a relatively simple pattern
Solution Approach 2:
The slit patterns in different common electrode regions are designed with asymmetric orientations relative to the subpixel electrodes. This asymmetric design allows each region to specifically address misalignment in particular directions, improving alignment precision through targeted pattern design rather than uniform complex patterns
3Ease of manufacture
If misalignment occurs during substrate bonding, then manufacturing is simpler without complex alignment mechanisms, but texture phenomena increase and transmittance decreases
Solution Approach 1:
The common electrode is designed with multiple regions having different slit patterns that serve as pre-configured compensation mechanisms. These regions are designed in advance to cushion against potential misalignment issues that may occur during substrate bonding, reducing texture phenomena and maintaining transmittance without requiring complex real-time alignment mechanisms
Solution Approach 2:
The slit patterns in different common electrode regions are designed with varying parameters (orientation, spacing, width) to optimize compensation for misalignment. By changing these parameters across different regions, the design accommodates manufacturing tolerances and maintains display performance stability without complicating the bonding process
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 reduces the occurrence of texture phenomena and minimizes the reduction in transmittance, resulting in improved display performance with reduced misalignment impacts, achieving approximately 7% less transmittance loss compared to conventional methods.
Implementation Method 1
the alignment of liquid crystal molecules of the liquid crystal layer is determined, and polarization of incident light is controlled by the alignment
Implementation Method 2
polarization of incident light is controlled by the alignment
Implementation Method 3
voltages are applied to the field generating electrodes to generate an electric field in the liquid crystal layer
Data Source
AI summary
A liquid crystal display including a first substrate; a pixel electrode which includes a first subpixel electrode and a second subpixel electrode disposed adjacent to and spaced apart from the first subpixel electrode on the first substrate; a second substrate facing the first substrate; and a common electrode disposed on the second substrate and defines a first slit thereof and a second slit thereof which is connected to the first slit. The first subpixel electrode defines a first plate-shaped portion overlapping the first slit and a plurality of first branches which extend from the first plate-shaped portion, and the second subpixel electrode defines a second plate-shaped portion overlapping the second slit and a plurality of second branch portions which extend from the second plate-shaped portion. At least one of the first branch portions is connected to at least one of the second branch portions.