Reflective LCD Pixel Electrode Edge Design for Disclination Control
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Solution Overview
Problem
Reflection-type liquid crystal display devices face challenges in achieving improved ease of viewing and maintaining high contrast ratios due to alignment defects and disclinations, which affect image quality and brightness.
Innovation Solution
The implementation of a light-transmissive second electrode portion within the first pixel electrode, which is continuous with the light-reflective first electrode portion, reduces the impact of disclinations by allowing incident light to pass through without reflection, thereby minimizing the decrease in image quality and maintaining display brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a light-reflective pixel electrode is used in a reflection-type liquid crystal display device, then the display can utilize external light for illumination, but alignment defects and disclinations occur at the edges of the pixel electrode, degrading image quality and reducing ease of viewing
Solution Approach 1:
The pixel electrode is divided into two distinct regions with different optical properties: a light-reflective first electrode portion for the central display area and a light-transmissive second electrode portion for the edge regions. This local differentiation allows the central area to maximize light reflection for display brightness while the edge area minimizes disclination effects by allowing light to pass through without reflection, thereby resolving the contradiction between light utilization efficiency and image quality reliability
2Illumination intensity
If the entire pixel electrode is made light-reflective to maintain high brightness, then display brightness is improved, but alignment defects and disclinations at the edges severely degrade image quality
Solution Approach 1:
The harmful light-reflective property is extracted and removed from the edge regions of the pixel electrode. By creating a light-transmissive second electrode portion at the edges, the patent eliminates the source of disclination-related image degradation in those specific areas, while preserving the light-reflective first electrode portion in the central region to maintain display brightness. This selective extraction resolves the contradiction between brightness and harmful alignment defect effects
3Reliability
If a light-shielding layer is added to block light at the edges to reduce disclination effects, then image quality improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The second electrode portion serves multiple functions simultaneously: it acts as a light-transmissive region to reduce disclination effects, functions as part of the pixel electrode structure for electrical control, and eliminates the need for separate light-shielding layers. This multi-functionality approach resolves the contradiction by achieving image quality improvement through a simpler, more integrated structure rather than adding complex separate components
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 enhances the viewability of the display by reducing the effects of alignment defects and disclinations, maintaining high contrast ratios and brightness, and eliminating the need for a light-shielding layer, thus improving the overall image quality.
Implementation Method 1
The first electrode portion is light-reflective
Implementation Method 2
At least a portion of the second electrode portion is provided between the first electrode portion and the second pixel electrode. A light reflectance of the second electrode portion is lower than a light reflectance of the first electrode portion
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes a first substrate unit, a second substrate unit, and a liquid crystal layer. The first substrate unit includes a first pixel electrode and a second pixel electrode. The second pixel electrode is adjacent to the first pixel electrode in the first direction. The second pixel electrode is light-reflective. The second substrate unit includes a counter electrode. The counter electrode is light-transmissive. The liquid crystal layer is provided between the first substrate unit and the second substrate unit. The first pixel electrode includes a first electrode portion and a second electrode portion. The first electrode portion is light-reflective. At least a portion of the second electrode portion is provided between the first electrode portion and the second pixel electrode. A light reflectance of the second electrode portion is lower than a light reflectance of the first electrode portion.