Color Filter Substrate Spacer Protrusions Prevent Light Leakage
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Solution Overview
Problem
Conventional liquid crystal display devices suffer from defects due to the movement of column spacers under external forces, which alter the alignment of liquid crystal molecules and result in light leakage during black image display, reducing aperture ratio and brightness.
Innovation Solution
A color filter substrate with a black matrix having protrusions that cover the contact areas of first column spacers, and a higher height and lower arrangement density of first column spacers compared to second column spacers, preventing light leakage by ensuring the alignment layer is not damaged and maintaining a higher aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the black matrix width is increased to cover the contact area of column spacers, then light leakage is prevented, but the aperture ratio is reduced
Solution Approach 1:
The patent applies local quality by forming protrusions only in specific regions of the black matrix where column spacers contact the alignment layer. Instead of uniformly increasing the black matrix width across the entire display area, protrusions are locally formed only at necessary positions to cover spacer contact areas, thus preventing light leakage at critical points while maintaining high aperture ratio in the remaining display areas.
2Manufacturing precision
If column spacers are used to maintain distance between substrates, then cell gap control is improved, but alignment layer damage occurs under external force
Solution Approach 1:
The patent applies preliminary action by forming protrusions on the black matrix before assembling the liquid crystal panel. These protrusions are pre-positioned to cover the contact areas where column spacers will touch the alignment layer. When external forces are applied during operation, the protrusions are already in place to prevent direct contact between spacers and the alignment layer, thus protecting the alignment layer from damage while maintaining the cell gap control function of the spacers.
3Reliability
If the black matrix width is increased to prevent light leakage, then display quality is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the black matrix into two functional parts: a base layer that maintains the standard width for normal operation, and protrusions that extend locally only where needed to cover spacer contact areas. This segmented approach allows the black matrix to provide light leakage prevention at specific locations without requiring a uniform increase in width across the entire structure, thus maintaining manufacturing simplicity while improving display quality.
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 effectively prevents light leakage during black image display, maintaining a higher aperture ratio and brightness by ensuring the alignment layer is not damaged and limiting the increase in black matrix width, thus improving the overall performance of the liquid crystal display device.
Implementation Method 1
Liquid crystal has optical anisotropy in which its molecular structure is thin and long and its molecular arrangement has directivity
Implementation Method 2
Liquid crystal has polarization in which the direction of its molecular arrangement changes according to the magnitude of an electric field
Implementation Method 3
a color filter layer formed on the black matrix, and including a red color filter, a green color filter, and a blue color filter
Data Source
AI summary
A color filter substrate includes a substrate in which a plurality of pixel areas are defined; a black matrix formed on the substrate, and having a plurality of openings in correspondence to the pixel areas; a color filter layer formed on the substrate, and including a red color filter, a green color filter, and a blue color filter that are sequentially arranged in a first direction in correspondence to the pixel areas; and a plurality of first column spacers and a plurality of second column spacers formed over the black matrix, and having different heights, wherein a height of each of the first column spacers is higher than a height of each of the second column spacers, and an arrangement density of the first column spacers is lower than an arrangement density of the second column spacers.