Liquid Crystal Display Light Blocking Member Spacer Overlap
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Solution Overview
Problem
The presence of spacers in liquid crystal displays (LCDs) can cause alignment failures and light leakage, leading to a deterioration in pixel aperture ratio and display quality due to the need for expanded light blocking members, which in turn affects the uniformity of pixel areas.
Innovation Solution
The implementation of a liquid crystal display design that includes a light blocking member with an expansion portion overlapping the spacer, arranged between different color pixel areas, and a photo-aligned layer structure to maintain the cell gap and prevent light leakage, while ensuring the aperture ratio remains consistent across all pixel areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the light blocking member is expanded to overlap with the spacer and prevent light leakage, then light leakage is reduced, but the pixel aperture ratio is deteriorated
Solution Approach 1:
The light blocking member is designed with different widths in different regions: it has a first width in regions not overlapping the spacer and a second width in regions overlapping the spacer. This local differentiation allows the light blocking member to effectively block light leakage at the spacer location while minimizing the impact on the overall pixel aperture ratio by maintaining a narrower width where it does not need to overlap the spacer.
2Object-affected harmful factors
If the light blocking member is expanded to overlap with the spacer, then light leakage is prevented, but the aperture ratio difference between pixels with and without spacers is deteriorated
Solution Approach 1:
The light blocking member employs different width specifications for different spatial regions. In regions where the spacer is present, the light blocking member has a larger width to ensure proper light blocking. In regions without the spacer, the light blocking member has a smaller width to maintain consistency with neighboring pixels. This localized width adjustment ensures uniform aperture ratio across all pixel types while effectively preventing light leakage where needed.
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 design effectively reduces the aperture ratio difference between pixels with and without spacers, thereby enhancing the overall display quality by minimizing light leakage and maintaining uniform transmittance across the LCD.
Implementation Method 1
The first alignment layer and the second alignment layer may include at least one of a cyclobutane-based photodegradable material and an azobenzene-based photoisomerization material
Implementation Method 2
The first alignment layer and the second alignment layer may include at least one of a cyclobutane-based photodegradable material and an azobenzene-based photoisomerization material
Implementation Method 3
In order to prevent light leakage due to the spacer, a light blocking member is expanded so as to be overlapped with the spacer
Implementation Method 4
A voltage is applied to the electrodes to change directions of liquid crystal molecules to thereby control transmittance of light transmitted through the liquid crystal layer
Data Source
AI summary
A liquid crystal display includes a plurality of red pixel areas, a plurality of green pixel areas, a plurality of blue pixel areas, and a light blocking member which defines the plurality of red pixel areas, the plurality of green pixel areas, and the plurality of blue pixel areas therein, and includes an expansion portion which overlaps a spacer which maintains a cell gap and is provided between the plurality of green pixel areas and the plurality of blue pixel areas and between the plurality of red pixel areas and the plurality of green pixel areas.