Display Panel Layer Structure for Photoresist Adhesion and Low Reflectivity
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Solution Overview
Problem
The existing display panels face issues with poor adhesive force between the photoresist and the darkening layer during the photoetching process, leading to peeling and abnormal display quality.
Innovation Solution
A display panel structure is introduced, where a functional layer with a higher adhesive force than the photoresist is added between the substrate and the darkening layer, comprising materials like transparent conductive materials or metals with specific thicknesses, to enhance the adhesive properties and reduce peeling risks during etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photoresist is coated on a darkening layer to achieve patterning, then the photoetching process can be performed, but the poor adhesive force causes the photoresist to peel off during wet etching
Solution Approach 1:
An organic layer is introduced as an intermediary between the inorganic darkening layer and the photoresist. This organic layer serves as a mediator that improves adhesion by providing compatible surface properties for both the inorganic darkening layer and the organic photoresist, preventing peeling during wet etching processes
Solution Approach 2:
The structure combines inorganic materials (darkening layer) with organic materials (organic layer and photoresist) to create a composite multilayer structure. This composite approach leverages the advantages of both material types: the inorganic darkening layer provides optical properties while the organic layer provides adhesion compatibility
2Object-affected harmful factors
If a darkening layer is added on metal to reduce reflectivity, then display quality improves, but the photoresist adhesive force deteriorates
Solution Approach 1:
The organic layer acts as a mediator between the metal/darkening layer structure and the photoresist. It allows the darkening layer to maintain its reflectivity-reducing function while the organic layer provides the necessary adhesion interface for the photoresist
Solution Approach 2:
Different layers in the structure have specialized local functions: the darkening layer locally addresses reflectivity reduction, while the organic layer locally addresses adhesion. This division of functional quality allows each layer to optimize its specific purpose without compromising the other
Data Source
AI summary
A display panel provided in embodiments of the present disclosure comprises a substrate, at least one metal layer, a darkening layer, and a functional layer, wherein the at least one metal layer is disposed on the substrate, the darkening layer covers the at least one metal layer, and the functional layer covers the darkening layer. An adhesive force of a photoresist to the functional layer is greater than an adhesive force of the photoresist to the darkening layer, and an adhesive force of the functional layer to the darkening layer is greater than the adhesive force of the photoresist to the darkening layer.