Reflective LCD Color Filter Protruding Pattern
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Solution Overview
Problem
Reflective liquid crystal displays (LCDs) face issues with color mixture at the boundaries between adjacent pixels due to the absence of a light blocking member, which affects the reflection contrast ratio and aperture ratio.
Innovation Solution
Incorporating a protruding pattern on the color filter layer with reflective members on its sidewalls, which extends along the boundary between different color filters, to minimize color mixture by blocking and reflecting light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking member is used to prevent color mixture at pixel boundaries, then color mixture is reduced, but the aperture ratio is reduced
Solution Approach 1:
A black matrix layer is introduced as an intermediary substance between adjacent color filters to prevent color mixture. This black matrix selectively blocks light in specific regions (at pixel boundaries) while allowing light transmission in pixel areas, thus preventing color mixture without significantly reducing the overall aperture ratio.
Solution Approach 2:
The light blocking property is applied locally only at pixel boundaries where color mixture occurs, rather than uniformly across the entire display. The black matrix is positioned specifically at the boundaries between adjacent pixels, allowing the majority of the pixel area to maintain high light transmission while preventing color leakage only where needed.
2Reliability
If a light blocking member is used to improve reflection contrast ratio, then reflection contrast ratio is improved, but device complexity increases
Solution Approach 1:
The light blocking function is merged with the existing color filter layer structure by integrating the black matrix layer into the same manufacturing process. The black matrix is formed using the same photolithography and deposition steps as the color filters, eliminating the need for separate light blocking components and reducing overall device complexity.
Solution Approach 2:
The black matrix layer serves multiple functions simultaneously: it acts as a light blocking member to prevent color mixture, provides structural support at pixel boundaries, and enhances the reflection contrast ratio. This multi-functionality reduces the need for additional specialized components, thereby simplifying the overall device structure.
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 reduces color mixture and maintains high reflection contrast without the need for a separate light blocking member, enhancing the display's performance and efficiency.
Implementation Method 1
reflective members which are disposed on sidewalls of the protruding pattern
Implementation Method 2
reflective members which are disposed on sidewalls of the protruding pattern
Data Source
AI summary
A liquid crystal display is provided. The liquid crystal display includes a first display substrate, a second display substrate which faces the first display substrate, and a liquid crystal layer which is disposed between the first display substrate and the second display substrate. The first display substrate comprises a first base substrate, a reflective electrode which is disposed on the first base substrate, and a pixel electrode which is disposed on the reflective electrode. The second display substrate comprises a second base substrate, a color filter layer which comprises a first color filter disposed on a surface of the second base substrate which faces the first base substrate and a second color filter configured to display a different color from the first color filter, a protruding pattern which is formed on a surface of the color filter layer facing the first base substrate and which extends along a boundary between the first color filter and the second color filter, and reflective members which are disposed on sidewalls of the protruding pattern.