Display Device Dam Structure for Organic Encapsulation Edge Control
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Solution Overview
Problem
Existing display devices for head-mounted displays face challenges in controlling the edge shape of the organic encapsulation layer, leading to potential issues with the flow of organic materials and bending, which affect luminance, light emission efficiency, and product reliability.
Innovation Solution
The display device incorporates a dam structure with alternating first and second dam patterns, where the second dam is positioned further from the display area, and an encapsulation layer that includes an organic layer covering the first dam without overlapping the second dam, ensuring controlled flow of organic materials and maintaining the edge shape of the encapsulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single dam structure is used, then the structure is simple, but the edge shape of the organic encapsulation layer cannot be controlled, leading to material flow and bending issues
Solution Approach 1:
The dam structure is divided into multiple dams (first dam, second dam, third dam) with different distances from the display area. Each dam has specific spacing relationships with the encapsulation layer, creating a segmented barrier system that controls organic material flow more effectively than a single dam structure.
Solution Approach 2:
Different dams are positioned at different distances from the display area with specific spacing relationships. The first dam is closer to the display area than the second dam, and the second dam is closer than the third dam. This creates localized control zones that address specific material flow issues at different positions.
2Illumination intensity
If the organic encapsulation layer is made thinner to improve luminance and light emission efficiency, then the display performance improves, but the edge shape control becomes more difficult
Solution Approach 1:
The encapsulation layer is segmented by the multiple dam structures, creating distinct regions with different thickness profiles. This segmentation allows the organic layer to be thinner in emission areas while maintaining adequate thickness and shape control in other regions through the dam barriers.
Solution Approach 2:
The dam structures create local variations in encapsulation layer thickness and shape. By positioning dams at specific distances from the display area, the organic layer can be optimized locally - thinner where luminance is prioritized, with controlled edge shapes where material flow prevention is critical.
3Productivity
If the organic encapsulation layer thickness is reduced, then light emission efficiency improves, but material flow and bending issues worsen
Solution Approach 1:
The multiple dam structures segment the encapsulation layer into distinct zones, allowing thinner organic layers in light-emitting regions while maintaining thicker, more stable regions near the dams that prevent material flow and bending.
Solution Approach 2:
Different regions of the encapsulation layer have different thicknesses and stability characteristics. The dam structures create local zones where the organic layer is protected from flow and bending, enabling thinner sections elsewhere to achieve high light emission efficiency without compromising overall material stability.
Data Source
AI summary
A display device includes: a substrate including a display area, a non-display area around the display area, and a plurality of transistors; a dam structure in the non-display area; a light emitting element layer including a plurality of light emitting elements in the display area; an encapsulation layer on the light emitting element layer; and a cover layer on the encapsulation layer. The dam structure includes: a first dam including a plurality of first dam patterns spaced from each other; and a second dam including a plurality of second dam patterns spaced from each other. A distance between the second dam and the display area is greater than a distance between the first dam and the display area.