Liquid Crystal Display Light Blocking Member Height Variation
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Solution Overview
Problem
In liquid crystal displays (LCDs), aligning pixel electrodes and color filters in different display panels can lead to alignment errors, and the surplus area of the black matrix reduces the aperture ratio, while the overflow or curl of liquid crystal material causes non-uniformity in the cell gap, affecting display quality.
Innovation Solution
A liquid crystal display design with a light blocking member in the non-display region, where the light blocking member is simultaneously formed with a spacer, and step providing layers are used to control the height and flowability of the liquid crystal material, preventing light leakage and maintaining uniform cell gaps by using a half-tone and full-tone mask pattern to form light blocking members of different heights in distinct regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pixel electrodes and color filters are disposed in different display panels, then the manufacturing process is simplified, but alignment errors occur between the pixel electrodes and color filters
Solution Approach 1:
The patent merges the pixel electrodes and color filters into the same display panel by disposing the color filter on the same panel as the pixel electrodes, rather than separating them into different panels. This integration eliminates the alignment errors that occur during assembly of separate panels while maintaining manufacturing efficiency through a unified structure.
2Reliability
If the light blocking member is disposed in the common electrode display panel, then assembly error margin is accommodated, but the aperture ratio is reduced due to surplus area
Solution Approach 1:
The patent applies different heights of the light blocking member at different locations within the non-display region. By making the light blocking member have a first height in a first region and a second height (greater than the first height) in a second region, the structure provides enhanced blocking capability where needed while minimizing the overall area occupied, thus maintaining higher aperture ratio.
3Ease of manufacture
If the light blocking member has uniform height, then manufacturing is simplified, but liquid crystal material overflow and curl cannot be effectively prevented
Solution Approach 1:
The patent implements a light blocking member with non-uniform height, where different regions have different heights (first height and second height). This local variation in height creates effective barriers at critical locations to prevent liquid crystal material overflow and curl, ensuring uniform cell gap while maintaining a relatively simple manufacturing process through a single structure design.
4Reliability
If the black matrix has surplus area to accommodate assembly error, then assembly tolerance is improved, but light leakage occurs and aperture ratio is reduced
Solution Approach 1:
The patent designs the light blocking member with varying heights in different regions, creating localized enhanced blocking zones. This approach provides sufficient coverage and tolerance for assembly errors while preventing light leakage through strategic height variations, avoiding the need for excessive surplus area that would reduce aperture ratio.
Data Source
AI summary
A liquid crystal display includes: a substrate including a display region and a non-display region, the non-display region including a first region adjacent to the display region and a second region further from the display region than the first region; a light blocking member disposed in the non-display region of the substrate; and a plurality of step providing layers disposed between the substrate and the light blocking member in the non-display region of the substrate, the step providing layers spaced apart from each other. A height of the light blocking member disposed in the first region of the non-display region is different from a height of the light blocking member disposed in the second region of the non-display region.