LCD Panel Alignment Protrusions for Aperture Ratio
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Solution Overview
Problem
Conventional LCD panels face issues with light leakage at the edges of spacers and alignment protrusions, which reduces the aperture ratio and affects image quality, despite the use of photo spacers and black matrices.
Innovation Solution
The use of alignment protrusions with varying heights on the opposite substrate, which also function as spacers, eliminates the need for additional spacers between the active device array substrate and the opposite substrate, thereby maintaining the cell gap and increasing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photo spacers are used to maintain cell gap uniformly, then the uniformity of spacer distribution is improved, but light leakage still occurs at the edges of photo spacers requiring black matrix
Solution Approach 1:
The patent combines the alignment protrusion structure with the spacer function by making the alignment protrusions extend through the liquid crystal layer to contact the color filter substrate, thereby serving dual purposes of liquid crystal alignment and cell gap maintenance without requiring separate spacers
Solution Approach 2:
The alignment protrusions are designed to perform multiple functions: providing alignment fields for liquid crystal molecules, maintaining cell gap, and replacing the need for separate spacer structures, thereby reducing the number of components and potential light leakage sources
2Manufacturing precision
If additional spacers are added to maintain cell gap, then the cell gap uniformity is improved, but the aperture ratio decreases
Solution Approach 1:
The patent merges the spacer function into the alignment protrusion structure by extending the protrusions through the liquid crystal layer to contact the color filter substrate, thereby maintaining cell gap without requiring additional spacer components that would reduce aperture ratio
Solution Approach 2:
The alignment protrusions serve dual functions as both alignment structures and spacers, eliminating the need for separate spacer components and preserving maximum aperture area
3Object-generated harmful factors
If black matrix is added to prevent light leakage, then the image quality is improved, but the aperture ratio decreases
Solution Approach 1:
The patent extracts the light leakage prevention function from the black matrix by using the alignment protrusions themselves as the light-blocking structures, thereby eliminating the need for additional black matrix areas and preserving aperture ratio
Solution Approach 2:
The alignment protrusions perform multiple functions including liquid crystal alignment, cell gap maintenance, and light leakage prevention, thereby reducing the need for separate black matrix structures
Data Source
AI summary
A liquid crystal display (LCD) panel is provided. The LCD panel includes an active device array substrate, an opposite substrate, and a liquid crystal layer. The active device array substrate includes a plurality of pixel units, and each of the pixel units has a reflective area and a transmissive area. The opposite substrate is disposed above the active device array substrate and has a plurality of first alignment protrusions corresponding to the reflective area and a plurality of second alignment protrusions corresponding to the transmissive area. The first and the second alignment protrusions are positioned between the opposite substrate and the active device array substrate. Additionally, a height of the first alignment protrusions is greater than a height of the second alignment protrusions. The liquid crystal layer is disposed between the opposite substrate and the active device array substrate. The LCD panel has a high aperture ratio.