Stepped Organic Insulation Layout for Moisture-Resistant Displays
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Solution Overview
Problem
Existing display devices face challenges in effectively preventing moisture and oxygen permeation, which can damage light emitting elements, particularly in the display area, while maintaining structural integrity and facilitating touch functionality.
Innovation Solution
The display device incorporates a substrate with a display area and peripheral area, featuring a transistor, pixel electrode, common electrode, and an organic insulation layer with varying thicknesses and valleys, along with an encapsulation layer and touch lines, to create a stepped structure that enhances moisture and oxygen barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform thickness organic insulation layer is used, then the manufacturing process is simple, but moisture and oxygen permeation cannot be effectively prevented in the display area
Solution Approach 1:
The organic insulation layer is designed with varying thickness across different regions: a first thickness in the peripheral area and a greater second thickness in the display area. This local differentiation allows the thicker portion in the display area to provide enhanced moisture and oxygen barrier properties where light emitting elements are located, while the thinner peripheral portion maintains structural support without unnecessarily increasing overall complexity.
2Reliability
If the organic insulation layer thickness is increased in the display area, then moisture and oxygen barrier properties improve, but the structural integrity and touch functionality may be compromised
Solution Approach 1:
The organic insulation layer is designed with varying thickness across different regions: a first thickness in the peripheral area and a greater second thickness in the display area. This local differentiation allows the thicker portion in the display area to provide enhanced moisture and oxygen barrier properties where light emitting elements are located, while the thinner peripheral portion maintains structural support and flexibility for touch functionality.
Solution Approach 2:
The patent introduces a stepped structure by varying the thickness of the organic insulation layer in the vertical dimension. This creates different height levels (first and second heights) that serve different functional requirements: the higher display area provides superior barrier protection, while the lower peripheral area maintains structural integrity and allows for encapsulation layer formation.
3Reliability
If a stepped organic insulation layer structure is created, then moisture and oxygen permeation is prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The organic insulation layer is segmented into distinct regions with different thicknesses: a first region in the peripheral area with a first thickness and a second region in the display area with a greater second thickness. This segmentation is achieved through controlled deposition or coating processes that can selectively apply material to different areas, allowing precise thickness control while maintaining manufacturing feasibility.
Data Source
AI summary
A display device includes a substrate that includes a display area and a peripheral area, a transistor in the display area, a pixel electrode connected to the transistor, a common electrode that overlaps the pixel electrode, and an organic insulation layer that is between the common electrode and the substrate, and overlaps at least a part of the peripheral area, wherein a thickness of a portion of the organic insulation layer overlapping the display area, and a thickness of a portion of the organic insulation layer overlapping the peripheral area, are different from each other, and the organic insulation layer includes a valley that penetrates the organic insulation layer, while overlapping the peripheral area.