Display Substrate Protection Unit for Bubble Prevention
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Solution Overview
Problem
In touch display devices, the reduction of transparent adhesive thickness to prevent air bubbles results in a loss of moisture and oxygen isolation, posing a challenge in maintaining the protective function while avoiding bubble formation.
Innovation Solution
A display substrate design featuring a protection unit with progressively decreasing protection blocks and a semicircular cross-section, formed using a mask plate, which reduces step differences and prevents air bubbles by effectively isolating moisture and oxygen, while maintaining the adhesive's protective function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of transparent adhesive is reduced to prevent air bubbles, then air bubble formation is reduced, but moisture and oxygen isolation function is lost
Solution Approach 1:
The protection unit is divided into multiple protection blocks arranged in rows and columns, with each block having a semicircular cross-section. This segmentation allows the structure to provide effective moisture and oxygen isolation while reducing step differences compared to a single thick adhesive layer, thereby preventing air bubble formation while maintaining protective function.
Solution Approach 2:
The protection blocks are arranged at intervals rather than forming a continuous layer, creating local protective zones. This local quality approach reduces the overall step difference across the surface while maintaining isolation function at critical locations, balancing bubble prevention with protective functionality.
2Reliability
If a thick protection layer is used to maintain protective function, then moisture and oxygen isolation is improved, but step differences increase causing air bubbles
Solution Approach 1:
By segmenting the protection layer into multiple smaller blocks arranged in rows and columns, the structure maintains sufficient protective coverage for moisture and oxygen isolation while reducing the height of individual steps. This segmentation eliminates large step differences that cause air bubbles during transparent optical film layer formation.
Solution Approach 2:
The protection blocks are arranged in a two-dimensional grid pattern (rows and columns) rather than a single continuous layer. This dimensional arrangement distributes the protective function across multiple locations while reducing the vertical step height, preventing air bubble formation during subsequent film deposition.
3Reliability
If continuous protection layer is used to ensure coverage, then protective function is maintained, but manufacturing complexity increases
Solution Approach 1:
The protection layer is segmented into discrete blocks arranged in rows and columns with semicircular cross-sections. This segmentation simplifies the manufacturing process by allowing standardized block formation through photomasking and etching, reducing the complexity of forming and managing a continuous thick protection layer.
Data Source
AI summary
The present disclosure provides a display substrate including a base substrate, a touch electrode layer on a light emergent side of the base substrate, a protection unit formed on a side of the touch electrode layer distal to the base substrate, the touch electrode layer comprises a touch function part and a binding part located at a side of the touch function part, the protection unit comprises a first part and a second part, the first part is located at a side of the binding part distal to base substrate and covers the binding part, the second part is located at a side of the touch function part distal to the base substrate, the second part comprises multiple protection blocks which are arranged at intervals, a maximum thickness of each protection blocks along a normal direction of the base substrate is less than that of the first part.