Display Device Engraved Pattern Organic Layer Sagging
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Solution Overview
Problem
Display devices face defects in visibility due to the sagging of organic layers at the end of the display area, caused by the uncontrolled flow of organic materials, leading to variations in thickness and reduced reliability.
Innovation Solution
A display device structure with an engraved pattern on the insulating layer, extending along one side of the display area and protruding in a cross direction, controls the flow of organic materials, reducing their spread and preventing sagging by increasing the contact angle and reducing capillary pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic material is applied to form the organic layer, then the encapsulation function is provided, but the organic material flows uncontrollably to the end portion of the display area causing sagging and visibility defects
Solution Approach 1:
The engraved pattern is formed in advance in the insulating layer before the organic material is applied. This pre-formed pattern creates physical barriers that guide and restrict the flow of organic material, preventing it from reaching the end portions of the display area where it would cause sagging and visibility defects.
Solution Approach 2:
The engraved pattern acts as an intermediary structure between the organic material and the end portions of the display area. By introducing this intermediate feature, the organic material's flow is controlled and redirected, preventing direct contact and accumulation at the problematic end regions.
2Ease of manufacture
If the organic layer is formed without flow control, then the manufacturing process is simple, but the organic material spreads to the end portion causing visibility defects
Solution Approach 1:
The engraved pattern in the insulating layer provides self-guidance for the organic material flow. The pattern's geometry automatically directs the material to appropriate areas and prevents it from reaching the end portions, eliminating the need for complex external control mechanisms or additional process steps.
3Area of stationary object
If the organic material flows freely, then complete coverage is achieved, but sagging occurs at the end portion of the display area
Solution Approach 1:
The engraved pattern divides the insulating layer into distinct regions with different flow characteristics. The patterned structures create segmented zones that control material distribution, ensuring adequate coverage in the display area while preventing accumulation and sagging at the end portions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents or reduces defects in visibility by minimizing the sagging of organic layers and variations in thickness, thereby enhancing the reliability and visibility of the display device.
Implementation Method 1
controls the flow of organic materials, reducing their spread and preventing sagging by increasing the contact angle and reducing capillary pressure
Data Source
AI summary
A display device includes: a base layer comprising a display area and a non-display area surrounding at least a portion of the display area; an insulating layer on the base layer and having an engraved pattern formed by removing at least a portion thereof in a thickness direction to overlap the non-display area; a light emitting element overlapping the display area and on the base layer; and an organic layer overlapping the display area and the non-display area, covering at least a portion of the engraved pattern, and on the light emitting element, wherein the engraved pattern comprises an extension portion extending in an extension direction along one side of the display area and protruding portions protruding from the extension portion to a cross direction away from the display area and spaced apart from each other.