Display Panel Asymmetric Dam Curvature for Narrow Non-Display Area
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Solution Overview
Problem
The challenge is to reduce the width of the non-display area in display panels to enhance display quality, resolution, and aesthetics while maintaining effective sealing and touch sensing functionality.
Innovation Solution
A display panel design featuring a support substrate with a display area, emitting array, first and second dam structures, and a sealing structure comprising inorganic and organic insulating materials, where the second sealing layer has side portions with different curvatures to minimize the non-display area width, and a touch sensing unit integrated with signal pads and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the width of the non-display area is decreased to increase the display area, then display quality and resolution are improved, but the sealing structure becomes more difficult to form reliably
Solution Approach 1:
The sealing structure is divided into multiple sealing layers (first sealing layer, second sealing layer, third sealing layer) with different materials and functions. Each layer provides specific protection: the first sealing layer provides initial sealing, the second sealing layer provides additional barrier protection, and the third sealing layer provides final protection. This segmented approach allows reliable sealing even in the reduced non-display area.
Solution Approach 2:
The sealing structure uses composite materials combining organic insulating materials and inorganic insulating materials in different layers. This composite structure leverages the advantages of both material types: organic materials provide flexibility and adhesion, while inorganic materials provide barrier properties against moisture and oxygen. The combination ensures reliable sealing in the compact design.
2Shape
If the non-display area width is reduced to improve aesthetics, then the display panel becomes more visually appealing, but the dam structure design becomes more complex
Solution Approach 1:
The first dam structure and second dam structure are designed with different configurations. The first dam structure has a first side portion with a first curvature, while the second dam structure has a second side portion with a second curvature greater than the first curvature. This asymmetric design allows optimization for both aesthetics and functionality within the reduced non-display area.
Solution Approach 2:
Different regions of the dam structure have different curvatures tailored to their specific requirements. The second dam structure has a greater curvature in its second side portion to accommodate the reduced non-display area width, while the first dam structure maintains a gentler curvature. This local differentiation optimizes the overall design.
3Measurement precision
If the non-display area is minimized to enhance resolution, then display quality improves, but the gradient requirements for dam structures become more stringent
Solution Approach 1:
The curvatures of the dam structures are carefully controlled with specific gradient ranges. The gradient of the side surface of the first dam structure is less than about 45°, while the gradient of the side surface of the second dam structure is about 45° to about 90°. These parameter specifications ensure that the dam structures can be manufactured with the required precision while maintaining the reduced non-display area width.
Data Source
AI summary
A display panel includes a first dam structure disposed in a first surrounding area in contact with one side of a display area in a non-display area, a second dam structure disposed in a second surrounding area in contact with another side of the display area in the non-display area and having a same thickness as the first dam structure, and a sealing structure covering an emitting array. A second sealing layer of the sealing structure includes a first side portion corresponding to the first dam structure and having a cross section with a first curvature and a second side portion corresponding to the second dam structure and having a cross section with a second curvature greater than the first curvature.