Display Substrate Planarization Using Lyophilic Depressed Regions
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Solution Overview
Problem
In display devices, the unevenness of planarization layers due to differences in thickness and lyophilicity across the substrate surface leads to poor performance, as the sub-pixel film formed on the planarization layer is prone to being uneven, affecting the overall display quality.
Innovation Solution
A display substrate with a patterned film having depressed and non-depressed portions, where the lyophilicity of the depressed portion is higher, allowing it to preferentially absorb and fill the planarization film, optimizing the flatness by maintaining shrinkage in the depressed areas, and including multiple planarization layers with varying lyophilicity to reduce height differences and shrinkage ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a planarization layer is formed on an uneven substrate surface, then the substrate surface is covered, but the planarization layer becomes uneven due to thickness differences, affecting subsequent film formation quality
Solution Approach 1:
The patent creates depressed portions in the patterned film before forming the planarization layer. This preliminary action allows the planarization layer material to be preferentially absorbed in the depressed areas, compensating for the uneven substrate surface and ensuring uniform subsequent film formation without requiring additional planarization processing
Solution Approach 2:
The patent introduces lyophilic-lyophobic patterns in the patterned film, creating local differences in surface properties. The lyophilic depressed portions selectively absorb planarization layer material, while lyophobic portions repel it, achieving local compensation of surface unevenness and uniform overall flatness
2Ease of manufacture
If the patterned film has uniform thickness, then manufacturing is simpler, but it cannot compensate for substrate unevenness, leading to poor planarization效果
Solution Approach 1:
The patent creates local variations in the patterned film by forming depressed portions with different lyophilic properties. This local quality differentiation allows the film to selectively absorb planarization layer material in depressed areas, achieving flatness compensation while maintaining relatively simple manufacturing processes
Solution Approach 2:
The patent changes the lyophilic-lyophobic parameters of the patterned film surface to create depressed portions that preferentially absorb planarization layer material. This parameter change enables the film to actively compensate for substrate unevenness rather than passively covering it
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 enhances the flatness of the planarization film, improving the uniformity of subsequent film formations and ensuring better display performance by maintaining the flatness and reducing the shrinkage differences across the substrate surface.
Implementation Method 1
lyophilicity of the depressed portion is higher than lyophilicity of the non-depressed portion
Implementation Method 2
the depressed portion having the higher lyophilicity absorbs the material of the planarization film in a liquid state, and thus the material of the planarization film in the liquid state gathers in the depressed portion, so that shrinkage can be reserved for the planarization film in an area where the depressed portion is disposed
Data Source
AI summary
Provided is a display substrate. The display substrate includes a base substrate, a patterned film disposed on a side of the base substrate, and a planarization film disposed on a side, distal from the base substrate, of the patterned film, wherein a surface, distal from the base substrate, of the patterned film has a depressed portion and a non-depressed portion. A thickness of the depressed portion is less than a thickness of the non-depressed portion, and lyophilicity of the depressed portion is higher than the lyophilicity of the non-depressed portion.