Patterned Protective Film Positioning in LCD Color Filter Substrates
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Solution Overview
Problem
In the manufacturing of TFT type liquid crystal display devices, foreign substances from the protective film on the color filter substrate can adhere to the non-overlapping region of the TFT substrate during mechanical cutting, leading to defective semiconductor chip mounting and reduced yield.
Innovation Solution
A protective film is patterned using photolithographic technology on the color filter substrate, with its outer peripheral end located inside the substrate's outer periphery and between the sealing material's inner and outer walls, preventing adherence of shavings or pieces during cutting and ensuring the semiconductor chip can be mounted correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective film is formed over the entire surface of the color filter substrate including the non-overlapping region, then the color filter is protected from damage, but foreign substances from the protective film can adhere to the non-overlapping region during mechanical cutting causing defective semiconductor chip mounting
Solution Approach 1:
The protective film is segmented into two regions: a first protective film formed only in the overlapping region, and a second protective film formed in the non-overlapping region with its outer peripheral end positioned inside the substrate's outer periphery. This segmentation prevents foreign substances from the second protective film from adhering to the non-overlapping region during mechanical cutting, while the first protective film continues to protect the color filter in the overlapping region.
Solution Approach 2:
Different protective film configurations are applied to different regions of the color filter substrate. The first protective film covers the overlapping region where color filter protection is critical, while the second protective film in the non-overlapping region is designed with its outer peripheral end inside the substrate periphery to prevent foreign substance generation during cutting. This local differentiation optimizes both protection and contamination prevention.
2Manufacturing precision
If photolithographic technology is used to pattern the protective film, then the outer peripheral end can be precisely positioned inside the substrate periphery, but the manufacturing process becomes more complex
Solution Approach 1:
The protective film is patterned using photolithographic technology before the mechanical cutting process. This preliminary action precisely positions the outer peripheral end of the second protective film inside the substrate's outer periphery, ensuring that no foreign substances are generated during subsequent cutting. The photolithographic patterning is performed as an early step in the manufacturing sequence, allowing precise control before mechanical processing.
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 solution effectively prevents foreign substances from adhering to the TFT substrate, increasing the yield of liquid crystal display device manufacturing by ensuring clean mounting of semiconductor chips and maintaining display performance and reliability.
Implementation Method 1
A protective film is patterned using photolithographic technology on the color filter substrate
Data Source
AI summary
A liquid crystal display device including a liquid crystal display panel having, a first substrate, a second substrate, a sealing material provided between the first substrate and the second substrate, a liquid crystal layer sealed in a region surrounded by the sealing material between the first substrate and the second substrate. The first substrate includes a plurality of first cell regions having a pixel electrode and a thin film transistor arranged in a matrix, and the second substrate includes a protective film over the second substrate and a light blocking film coated with the protective film on a surface of the second substrate on the liquid crystal layer side.