Light-Emitting Display Encapsulation With Moisture-Blocking Bezel
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Solution Overview
Problem
Existing display apparatuses face issues with moisture penetration through side surfaces, leading to reduced display area and damage to light-emitting devices during encapsulation substrate separation, which affects image quality and process efficiency.
Innovation Solution
The display apparatus incorporates a moisture-blocking hole in the bezel area with an encapsulating element and a variable adhesive layer that includes heat or UV-responsive beads, along with a stacked inorganic and organic encapsulating layer, to prevent moisture ingress and facilitate encapsulation substrate separation without damaging the light-emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bezel area is increased to block moisture penetration through the side surface, then moisture blocking is improved, but the display area is reduced
Solution Approach 1:
The patent extracts the moisture-blocking function from the bezel area and relocates it to the encapsulation substrate. The encapsulation substrate is extended to cover the side surface of the display apparatus, creating a barrier that prevents moisture penetration without requiring an increased bezel area. This separates the moisture-blocking function from the display area boundary.
Solution Approach 2:
The patent addresses moisture penetration from the side surface by extending the encapsulation substrate in the vertical dimension to cover the side surface. This creates a stepped structure where the encapsulation substrate forms a barrier wall along the side surface, blocking moisture from reaching the light-emitting devices through lateral pathways.
2Strength
If the front adhesive layer is used to bond the encapsulation substrate, then bonding strength is improved, but the light-emitting devices are damaged during separation
Solution Approach 1:
The patent applies different adhesive properties to different regions of the front adhesive layer. In the display area, the adhesive provides strong bonding to prevent moisture ingress, while in the bezel area, the adhesive formulation or thickness is modified to allow for easier separation. This local differentiation enables strong bonding where needed while facilitating damage-free separation in other regions.
Solution Approach 2:
The front adhesive layer is functionally segmented into different regions with different adhesive characteristics. The display area portion maintains strong adhesion for moisture blocking, while the bezel area portion is designed with reduced adhesion strength or different chemical properties to enable clean separation of the encapsulation substrate without damaging the light-emitting devices during rework processes.
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
This design effectively prevents moisture penetration, maintains display area integrity, and enhances process efficiency by ensuring the encapsulation substrate can be separated without damaging the light-emitting devices, thereby improving overall quality and productivity.
Implementation Method 1
The variable beads may include a material in which a volume is changed by heat or UV
Implementation Method 2
The variable beads may include a material in which a volume is changed by heat or UV
Data Source
AI summary
A display apparatus including a light-emitting device is provided. The light-emitting device is disposed on a display area of a device substrate. An over-coat layer between the device substrate and the light-emitting device extends onto a bezel area. A moisture-blocking hole penetrating the over-coat layer is disposed on the bezel area. At least a portion of the moisture-blocking hole is filled by an encapsulating element disposed on the light-emitting device. A front adhesive layer covering the encapsulating element may attach an encapsulation substrate to the device substrate in which the light-emitting device and the encapsulating element are formed. A variable adhesive layer is disposed between the encapsulating element and the front adhesive layer and/or the over-coat layer and the front adhesive layer of the bezel area. Thus, in the display apparatus, the penetration of external moisture may be blocked, and the process efficiency and the productivity may be improved.