Color Filter Substrate Overcoat With Single-Material Spacers
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Solution Overview
Problem
Current methods for fabricating color filter substrates involve using two different materials for the overcoat layer and spacers, which are costly and time-consuming, and face challenges in improving material bonding quality at their interface.
Innovation Solution
A method is developed to form an overcoat layer with multiple portions of different heights using a single material, achieved through a series of exposure and development steps with a mask having varying light-transmitting areas, reducing material variety and enhancing bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two different materials are used for the overcoat layer and spacers, then the functional requirements can be met, but the manufacturing cost increases and the process time extends
Solution Approach 1:
The patent merges the overcoat layer and spacer into a single integrated structure made from one material layer. The overcoat layer is formed with a pattern that includes both flat regions (serving as the overcoat) and protruding regions (serving as spacers), eliminating the need for separate spacer materials and reducing manufacturing steps.
Solution Approach 2:
The single overcoat material layer serves multiple functions simultaneously: it provides the overcoat protective layer in flat regions and acts as spacers in protruding regions. This multi-functional design replaces the traditional two-material system, reducing complexity while meeting all functional requirements.
2Adaptability or versatility
If two different materials are used for the overcoat layer and spacers, then the structural requirements can be satisfied, but the number of process steps increases
Solution Approach 1:
The patent combines the formation of the overcoat layer and spacers into a single patterning process. By using photolithography with a specific mask pattern on a single material layer, both the overcoat and spacer structures are created simultaneously, reducing the number of fabrication steps.
Solution Approach 2:
The single overcoat material layer is segmented into different functional regions through photolithographic patterning. The mask creates distinct flat portions and protruding portions within the same material layer, allowing one material to fulfill multiple structural roles without requiring separate fabrication processes.
3Adaptability or versatility
If two different materials are used for the overcoat layer and spacers, then the functional design can be achieved, but the material bonding quality at the interface deteriorates
Solution Approach 1:
The patent uses the same material for both the overcoat layer and spacers, ensuring homogeneous material composition throughout the structure. This eliminates the interface between different materials, thereby eliminating bonding issues that would arise from material incompatibility or poor adhesion between dissimilar materials.
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 simplifies the manufacturing process, reduces material complexity, and enhances the overcoat layer's resistance to external forces by integrating spacers and the overcoat layer into a single material structure.
Implementation Method 1
performing an exposure step on the at least one overcoat material layer using a mask
Data Source
AI summary
A method of fabricating a color filter substrate including forming a color filter layer on a substrate, forming at least one overcoat material layer, performing an exposure step on the at least one overcoat material layer by using a mask and performing a development step to remove a portion of the at least one overcoat material layer and form an overcoat layer having a flat portion, a first protruding portion and a second protruding portion is provided. The mask has a first light-transmitting area and a second light-transmitting area. The transmittance of the first light-transmitting area is greater than the transmittance of the second light-transmitting area. The flat portion, the first protruding portion and the second protruding portion of the overcoat layer respectively have different heights relative to a substrate surface of the substrate.