Multi-Level Blocking Structure for OLED Encapsulation
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Solution Overview
Problem
Conventional OLED display panels face reduced product lifespan due to sensitivity to oxygen and moisture, and existing thin-film encapsulating methods often result in organic material overflow during manufacturing, compromising the encapsulating effect.
Innovation Solution
A display panel design featuring a blocking portion with a specific sub-blocking structure, comprising a first sub-blocking portion, multiple second sub-blocking portions partially covering the first, and blocking units with third sub-blocking portions, where the gap between the tops of adjacent third sub-blocking portions is smaller than the gap between their bottoms, effectively preventing organic layer overflow and enhancing encapsulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional dam structure is used for blocking organic material, then the manufacturing process is simple, but the blocking effect is insufficient and organic material overflows
Solution Approach 1:
The blocking portion is divided into multiple sub-blocking portions (first, second, and third sub-blocking portions) arranged in different layers. Each sub-blocking portion serves as a separate blocking element, collectively forming a multi-level blocking system that effectively prevents organic material overflow while maintaining manageable complexity through modular segmentation.
Solution Approach 2:
The blocking structure transitions from a conventional single-layer planar dam to a multi-layer three-dimensional configuration. The first sub-blocking portion is in a first layer, the second sub-blocking portion is in a second layer partially covering the first, and the third sub-blocking portions are in a third layer forming blocking units. This vertical stacking creates a stepped configuration that enhances blocking effectiveness by preventing organic material from bypassing any single layer.
2Reliability
If the gap between blocking units is large at the bottom, then manufacturing is easier, but organic material can penetrate through to the top
Solution Approach 1:
The blocking units feature an asymmetric gap configuration where the gap between adjacent blocking units is larger at the bottom and smaller at the top. Specifically, the third sub-blocking portions are positioned such that the gap between their outer edges (at the top) is smaller than the gap between their inner edges (at the bottom). This asymmetric design allows organic material to be blocked at the narrow top gap while still permitting easier manufacturing alignment at the wider bottom gap.
3Adaptability or versatility
If thin-film encapsulating method is used for flexibility, then the display panel can be bendable and foldable, but organic material overflow occurs during manufacturing
Solution Approach 1:
The multi-level blocking portion structure is constructed in advance before the organic layer is deposited. The first, second, and third sub-blocking portions are sequentially formed to create a pre-configured blocking system with controlled gap dimensions. This preliminary action ensures that when the organic material is subsequently deposited, the blocking structure is already in place to prevent overflow, while the thin-film nature of the blocking layers maintains the overall flexibility of the display panel.
Data Source
AI summary
The present invention provides a display panel, a display module, and an electronic device. The display panel includes at least one blocking portion. Each blocking portion has a first sub-blocking portion, at least one second sub-blocking portion, and at least one blocking unit. The at least one second sub-blocking portion partially covers the first sub-blocking portion. The blocking unit partially cover the corresponding second sub-blocking portion. A gap between tops of each two adjacent third sub-blocking portions is smaller than a gap between bottoms of each two adjacent third sub-blocking portions.