Reflective LCD Slit Reflection Layer Prevents Color Mixture
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Solution Overview
Problem
Reflective liquid crystal display devices face challenges in preventing color mixture at the edge portions between color filters, which affects the aperture ratio and image resolution, especially since existing designs often require a light blocking layer to prevent light reflection at these edges.
Innovation Solution
The design incorporates a reflection layer with slit portions that overlap the edge portions between color filters, ensuring that light reflection does not occur at these areas, thereby maintaining a black state and preventing color mixture, and the reflection layer is insulated from the pixel electrode to prevent potential flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking layer is added to prevent color mixture at color filter edges, then color mixture is prevented, but device thickness and complexity increase
Solution Approach 1:
The patent removes the light blocking layer from the display device structure entirely. Instead of adding a light blocking layer to prevent color mixture, the invention uses the reflection layer with strategically positioned slit portions that overlap the color filter edges, allowing the reflection layer itself to prevent color mixture without requiring an additional light blocking layer.
Solution Approach 2:
The reflection layer is given multiple functions: it serves both as the reflective element for display operation and as the structure that prevents color mixture at color filter edges through its slit portions. This eliminates the need for a separate light blocking layer, reducing device complexity while maintaining the color mixture prevention function.
2Object-affected harmful factors
If a light blocking layer is added to prevent color mixture at color filter edges, then color mixture is prevented, but aperture ratio decreases
Solution Approach 1:
The patent extracts and removes the light blocking layer from the device structure, eliminating the area it would occupy. The reflection layer with slit portions takes over the color mixture prevention function, allowing the full aperture area to be utilized without being reduced by a separate light blocking layer.
3Ease of manufacture
If the reflection layer is not insulated from the pixel electrode, then manufacturing is simpler, but display stability deteriorates due to potential flickering
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the reflection layer and the pixel electrode. This insulating layer prevents direct electrical contact that could cause flickering, while still allowing the reflection layer to function properly. The insulating layer acts as a mediator that maintains display stability without significantly complicating the manufacturing 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 approach enhances the aperture ratio and allows for high-resolution image display without the need for a light blocking layer at the edge portions, resulting in a thinner and more power-efficient reflective LCD device.
Implementation Method 1
Another type of LCD, know as a reflective LCD, adjusts light transmittance by reflecting natural light or external artificial light to display an image
Data Source
AI summary
A liquid crystal display device includes a first substrate opposing a second substrate, a reflection layer on the first substrate, a color filter layer on the reflection layer, and a pixel electrode on the color filter layer. The color filter layer includes a first color filter adjacent to a second color filter. The reflection layer includes a slit portion overlapping an edge portion between the first color filter and the second color filter.