Black Matrix and Column Spacer Integration for LCD Light Leakage
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Solution Overview
Problem
Liquid crystal display devices face color mixture issues between adjacent pixels due to light leakage, which is difficult to prevent without compromising aperture ratio and manufacturing complexity.
Innovation Solution
A liquid crystal display device structure featuring a black matrix with a reduced width, integrated with a column spacer on the TFT array substrate, effectively blocks light leakage by positioning the black matrix closer to the boundary between sub-pixels, improving transmittance and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional black matrix structure is used to prevent color mixture, then color mixture between adjacent pixels is suppressed, but aperture ratio is reduced and manufacturing complexity increases
Solution Approach 1:
The black matrix is repositioned from the color filter substrate to the TFT array substrate, changing its spatial dimension and location. This dimensional change allows the black matrix to be positioned closer to the liquid crystal layer, effectively blocking light leakage at the pixel boundaries without requiring increased width that would reduce aperture ratio.
Solution Approach 2:
The black matrix and column spacer are integrated into a single structure on the TFT array substrate. The column spacer serves dual functions: maintaining the cell gap and providing the black matrix function for light leakage prevention. This merging eliminates the need for separate black matrix structures, simplifying manufacturing and preserving aperture ratio.
2Object-affected harmful factors
If a conventional black matrix structure is used to prevent color mixture, then color mixture between adjacent pixels is suppressed, but device complexity increases
Solution Approach 1:
The black matrix and column spacer are merged into a single integrated structure formed simultaneously on the TFT array substrate. This consolidation reduces the number of manufacturing steps and materials required, simplifying the overall device structure and manufacturing process while maintaining effective light leakage prevention.
Solution Approach 2:
The column spacer structure is given multi-functionality by incorporating the black matrix function into it. This single structure simultaneously performs cell gap maintenance and light leakage prevention, reducing device complexity by eliminating redundant components and simplifying the manufacturing process.
3Area of stationary object
If black matrix width is reduced to improve transmittance, then aperture ratio is improved, but light leakage prevention capability is weakened
Solution Approach 1:
The black matrix is repositioned to the TFT array substrate side, changing its spatial location to be closer to the liquid crystal layer. This dimensional change allows effective light leakage prevention with a narrower width, as the black matrix is positioned at the optimal location where light leakage occurs, rather than on the color filter substrate side.
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
The solution efficiently suppresses color mixture between adjacent pixels, enhancing transmittance and reducing manufacturing costs by integrating the black matrix and column spacer on the TFT array substrate, while maintaining a high aperture ratio.
Implementation Method 1
a black matrix disposed underneath along a boundary between the first sub-pixel and the second sub-pixel and configured to have a particular width that suppresses color mixture between the first sub-pixel and the second sub-pixel
Implementation Method 2
The liquid crystal has an optical anisotropy having a directivity of an orientation and a polarization property by which when the liquid crystal is located in an electric field, an orientation of the molecules changes depending on an intensity of the electric field
Implementation Method 3
The liquid crystal has an optical anisotropy having a directivity of an orientation and a polarization property
Data Source
AI summary
Provided is a liquid crystal display device. The liquid crystal display device includes a first sub-pixel configured to represent any one of red, green, and blue; a second sub-pixel adjacent to the first sub-pixel and configured to represent a different color from the first sub-pixel; and a black matrix disposed underneath along a boundary between the first sub-pixel and the second sub-pixel and configured to have a particular width that suppresses color mixture between the first sub-pixel and the second sub-pixel.