OLED Display Window Optical Adhesive for Moisture Barrier and Uniformity
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Solution Overview
Problem
Organic light emitting diode (OLED) display apparatuses face issues with moisture and oxygen permeation in the window region due to inadequate encapsulation, and air gaps between the cover glass and accessories, leading to display non-uniformity and optical performance issues.
Innovation Solution
A display apparatus with an optical clear adhesive layer occupying the accessory hole in the window region, eliminating air gaps between the adhesive layer and the cover glass, and featuring a unidirectional light transmitting layer and light shielding coating to enhance optical performance and encapsulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the window region is used to install accessories (camera, sensor, etc.), then the functionality and versatility of the display apparatus is improved, but moisture and oxygen permeation occurs due to inadequate encapsulation in the window region
Solution Approach 1:
The window region is segmented into multiple functional layers: a first adhesive layer for basic bonding, a second adhesive layer specifically for moisture and oxygen barrier function, and optional light shielding layers. This segmentation allows each layer to perform its specialized function, with the second adhesive layer providing targeted protection against environmental harmful factors while the first adhesive layer provides structural support.
Solution Approach 2:
The encapsulation structure uses composite material design by combining different adhesive layers with distinct properties. The first adhesive layer and second adhesive layer are composed of different materials with complementary characteristics - one optimized for adhesion strength and the other for moisture and oxygen barrier performance. This composite approach creates a multi-functional encapsulation system that simultaneously addresses bonding and environmental protection requirements.
2Ease of manufacture
If air gaps exist between the cover glass and accessories in the window region, then the manufacturing process is simpler, but display uniformity and optical performance are degraded
Solution Approach 1:
Adhesive layers serve as intermediary substances between the cover glass, display substrate, and accessories. These adhesive layers fill the spaces and interfaces between components, eliminating air gaps that cause optical interference and display non-uniformity. The adhesive material acts as a mediator that maintains direct optical contact while providing mechanical bonding, thus resolving the contradiction between manufacturing simplicity and display uniformity.
3Ease of manufacture
If the optical clear adhesive layer has the same refractive index as the cover glass, then the manufacturing process is simpler, but light reflection on the surface increases
Solution Approach 1:
The refractive index of the optical clear adhesive layer is deliberately changed to be greater than that of the cover glass. This parameter change reduces light reflection at the interface between the adhesive layer and cover glass, improving optical performance. The patent specifies that the adhesive layer should have a refractive index greater than the cover glass to minimize reflective losses, thereby enhancing display brightness and color accuracy.
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 moisture and oxygen ingress, improves display uniformity, and enhances the optical performance of accessories like camera lenses by eliminating air gaps and ensuring direct contact between the adhesive layer and the cover glass.
Implementation Method 1
the optical clear adhesive layer comprises an optical clear adhesive material having a refractive index greater than a refractive index of the cover glass, thereby reducing light reflection on a surface of the display apparatus
Data Source
AI summary
A display apparatus having a display region, and a window region substantially surrounded by the display region and configured to install an accessory therein is provided. The display apparatus in the display region includes a plurality of display functional layers, the plurality of display functional layers comprising a display substrate. The display apparatus in the window region includes an optical clear adhesive layer at least partially occupying an accessory hole in the window region; and the accessory on a side of the optical clear adhesive layer away from a cover glass. The display substrate is completely absent in the accessory hole. The display apparatus is absent of any air layer between the optical clear adhesive layer and the cover glass.