Liquid Crystal Display Spacer Alignment with Black Matrix
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Solution Overview
Problem
In liquid crystal display panels, the precision of pixels leads to instability in unit thickness control due to offset issues with photosensitive spacers, resulting in reduced aperture ratio and contrast due to light leakage and disordered liquid crystal orientation.
Innovation Solution
The liquid crystal display panel design includes spacers with specific dimensions and orientations, positioned corresponding to the black matrix, ensuring they do not protrude into the light transmission region and maintaining constant thickness by aligning with the black matrix's direction, thereby reducing light leakage and improving contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photosensitive spacers are formed between substrates to maintain unit thickness, then thickness control is improved, but offset occurs during substrate bonding causing spacers to fall into through holes, resulting in unstable thickness control
Solution Approach 1:
The spacer formation process is performed as a preliminary step before substrate bonding. By forming spacers on the color filter substrate first, their positions are predetermined and fixed before the bonding process occurs, preventing offset during assembly
Solution Approach 2:
The spacer acts as an intermediary element between the color filter substrate and the active matrix substrate. It mediates the thickness control function while being positioned on the color filter substrate, preventing it from falling into through holes of the active matrix substrate during bonding
2Manufacturing precision
If photosensitive spacers are positioned near gate-line and data-line intersecting portions, then unit thickness is maintained, but spacers protrude into light transmission regions, reducing aperture ratio
Solution Approach 1:
The spacer is designed with non-uniform width along its length, creating different local qualities. The wider portion is positioned at the center while narrower portions are at the ends, allowing the spacer to maintain thickness control function while minimizing protrusion into light transmission regions
Solution Approach 2:
The spacer structure employs asymmetric width distribution rather than uniform width. This asymmetric design allows optimal positioning where the wider central portion provides effective thickness control while the narrower end portions reduce obstruction of light transmission areas
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 stabilizes unit thickness control, maintains high aperture ratio, and enhances display contrast by preventing spacer deflection into the light transmission region and ensuring uniformity in thickness.
Implementation Method 1
spacers located in the liquid crystal layer and configured to maintain thickness of the liquid crystal layer
Implementation Method 2
a black matrix located on the second substrate and disposed along the extending direction of the scanning line
Data Source
AI summary
A liquid crystal display panel, including first and second pixels adjacently disposed in an extending direction of a gate line, where pixel electrodes in the first and second pixels are respectively connected with switch elements through first and second through holes. The liquid crystal display panel is further provided with a plurality of spacers configured to maintain thickness of the liquid crystal display panel; and a black matrix disposed along the extending direction of the gate line; where the spacers are disposed corresponding to the black matrix and the spacer has a first width in a direction parallel to an extending direction of the black matrix and a second width in a direction vertical to the extending direction of the black matrix, the second width is less than the first width which is no less than a distance between the first through hole and the second through hole.