Color Filter Substrate Dummy Pattern for Uniform Spin-Coating
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Solution Overview
Problem
The spin-coating process for manufacturing color filters in liquid crystal display (LCD) devices often results in non-uniform formation of subsequent color photoresist layers, leading to radial stain defects due to the first color filters acting as barriers, which complicates the manufacturing process and affects display quality.
Innovation Solution
Incorporating a dummy pattern with a rounded edge in the peripheral area surrounding the display area, which has the same color as the filters, to prevent the first color filters from acting as barriers during the spin-coating of subsequent layers, ensuring uniform distribution and formation of subsequent color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spin-coating process is used to form subsequent color photoresist layers, then the manufacturing process can be simplified, but non-uniform formation occurs leading to radial stain defects
Solution Approach 1:
A dummy pattern with rounded edges is formed in the peripheral area surrounding the display area before forming the color filters. This preliminary structure prevents the first color filters from acting as barriers during subsequent spin-coating processes, ensuring uniform distribution of color photoresist layers and preventing radial stain defects.
Solution Approach 2:
The dummy pattern serves as an intermediary element between the first color filters and the subsequent color photoresist layers. By having the same color as the filters and positioned in the peripheral area, it mediates the interaction during spin-coating, preventing the color filters from creating barrier effects while maintaining manufacturing simplicity.
2Area of stationary object
If multiple color filters are formed sequentially, then the display area can be fully covered with required colors, but the complexity of the manufacturing process increases
Solution Approach 1:
The dummy pattern is formed in advance in the peripheral area before forming multiple color filters sequentially. This preliminary action simplifies subsequent manufacturing steps by preventing barrier effects during spin-coating, allowing full coverage of the display area with required colors without increasing process complexity.
Solution Approach 2:
The dummy pattern is positioned specifically in the peripheral area surrounding the display area, where it provides localized functionality to prevent barrier effects during spin-coating. This local placement allows multiple color filters to be formed sequentially across the display area without increasing overall manufacturing complexity.
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 approach improves the reliability of the color filter manufacturing process by preventing radial stain defects and enhancing display quality by ensuring uniform formation of color filters, thereby improving the overall manufacturing efficiency and image quality.
Implementation Method 1
The color photoresist layer may be formed through a spin-coating process and/or a slit-coating process using a slit mask.
Implementation Method 2
when the second color photoresist layer is formed by using the spin-coating process
Data Source
AI summary
A color filter substrate includes a plurality of color filters and a first dummy pattern. The color filters are formed in a display area. The color filters include a plurality of colors. The first dummy pattern is formed in a peripheral area surrounding the display area. The first dummy pattern has a color identical to one of the colors. An edge portion of the first dummy pattern corresponding to an apex of the display area is rounded. Therefore, the reliability of a color filter manufacturing process may be improved, the reliability of the color filter may be improved, and the generation of stain defects having a radial shape may be prevented, so that display quality may be improved.