Display Substrate Dam Structure for Under-Display Light Transmittance
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Solution Overview
Problem
Current display technologies face challenges in maximizing the screen-to-body ratio, particularly in integrating optical devices like cameras under the display screen, which hinders the achievement of a full-screen design with high light transmittance and efficient encapsulation.
Innovation Solution
A display substrate design featuring a peripheral region with a first dam, a connection portion, and a second dam, where the second dam is taller than the first dam, and a connection portion connects them, along with a layered structure of blocking layers and planarization layers, to enhance light transmittance and encapsulation, allowing for the integration of optical devices while maintaining display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single-height dam structure is used for encapsulation, then the manufacturing process is simple, but the light transmittance in auxiliary display regions is reduced and optical device performance is compromised
Solution Approach 1:
The dam structure is segmented into multiple sections with different heights: a first dam region with first height, a second dam region with second height greater than the first height, and a connection portion connecting them. This segmentation allows the encapsulation structure to adapt to different functional requirements in different regions, ensuring both high light transmittance in auxiliary display regions and effective encapsulation of optical devices.
Solution Approach 2:
Different regions of the dam structure are assigned different heights based on local requirements: the first dam region provides sufficient encapsulation for standard areas, while the second dam region with greater height provides enhanced encapsulation for optical devices, and the connection portion ensures structural integrity. This local differentiation optimizes both light transmittance and encapsulation effectiveness.
2Reliability
If taller dams are built to improve encapsulation, then encapsulation efficiency increases, but light transmittance in auxiliary display regions decreases
Solution Approach 1:
The encapsulation structure is divided into segments with different heights: the first dam region with first height and the second dam region with second height greater than the first height. This segmentation ensures that encapsulation is enhanced only where needed (second dam region for optical devices) while maintaining high light transmittance in auxiliary display regions (first dam region), thus resolving the contradiction between encapsulation efficiency and light transmittance.
Solution Approach 2:
The dam structure implements local quality by assigning different heights to different regions based on their specific requirements. The second dam region has greater height to provide robust encapsulation for optical devices, while the first dam region has sufficient but not excessive height to maintain high light transmittance. This localized optimization resolves the contradiction between overall encapsulation efficiency and local light transmittance.
3Reliability
If multiple blocking layers are stacked to enhance encapsulation, then encapsulation reliability improves, but the number of manufacturing steps increases
Solution Approach 1:
The first blocking layer and second blocking layer are merged into a continuous blocking structure that extends across different regions. This merging approach maintains encapsulation reliability by providing continuous barrier coverage while reducing manufacturing complexity by forming the blocking structure in an integrated manner rather than as separate discrete layers, thus resolving the contradiction between encapsulation reliability and ease of manufacture.
Data Source
AI summary
A display substrate has a display region and a peripheral region. The display substrate includes a substrate, a first dam, a second dam and a connection portion. The first dam and the second dam are located on a side of the substrate, and are located in the peripheral region. The second dam is farther from the display region than the first dam. A height of the second dam is greater than a height of the first dam. The connection portion is located between the first dam and the second dam. The connection portion connects the first dam and the second dam, and a height of the connection portion is less than the height of the first dam. At least a portion of the first dam, at least a portion of the connection portion and at least a portion of the second dam are of an integrative structure.