UV-Filtering OCA Adhesive Stack for Display Discoloration
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Solution Overview
Problem
The quality of electronic displays can be compromised by adhesives used in assembling the display stack, as they may lack sufficient adhesion strength, leading to delamination and bubble formation, and materials can change color when exposed to UV radiation, affecting the appearance of content displayed.
Innovation Solution
Using a combination of a first optically clear adhesive with a UV-filtering additive and a second optically clear adhesive, such as a silicon-containing adhesive, to couple substrates in the display stack, improving adhesion strength and minimizing UV-induced discoloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single optically clear adhesive is used to couple substrates, then the assembly process is simple, but the adhesion strength is insufficient leading to delamination and bubble formation
Solution Approach 1:
The adhesive system is divided into multiple distinct adhesive layers, each with specific functions. The first adhesive layer provides UV filtration and initial bonding, while the second adhesive layer provides additional adhesion strength and final sealing, resolving the contradiction between simple assembly and sufficient adhesion strength
Solution Approach 2:
The patent uses composite adhesive structures where different adhesive materials are combined in specific sequences. This composite approach allows each layer to contribute its unique properties (UV filtration, adhesion strength, bubble prevention) to achieve overall performance that a single adhesive cannot provide
2Object-affected harmful factors
If standard optically clear adhesives are used, then the assembly process is straightforward, but UV radiation causes discoloration of UV-sensitive layers affecting display quality
Solution Approach 1:
The first adhesive layer acts as an intermediary between the UV source and the UV-sensitive display layers. By incorporating UV-absorbing additives, this intermediate layer filters harmful UV radiation before it reaches sensitive components, preventing discoloration while maintaining optical clarity for visible light
Solution Approach 2:
The patent modifies the chemical composition of the adhesive by adding UV-absorbing substances, changing its optical parameters. This allows the adhesive to selectively absorb UV wavelengths while remaining transparent to visible light, thus protecting against discoloration without affecting display quality
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 solution enhances the adhesion between substrates, reduces delamination, and protects UV-sensitive layers from radiation, resulting in improved display quality and appearance by maintaining the clarity and color accuracy of content.
Implementation Method 1
a first optically clear adhesive that includes an additive to filter ultraviolet radiation
Data Source
AI summary
In some implementations, an electronic device includes a display stack to display content. The display stack can include a number of substrates coupled using a first optically clear adhesive (OCA) and a second OCA. In an implementation, the first OCA includes an acrylic-containing OCA and the second OCA includes a silicon-containing OCA. In some instances, the first OCA can include an additive to filter ultraviolet radiation. In a particular implementation, the first OCA can have a total luminous transmittance of no greater than approximately 30% for at least a portion of the UV spectrum radiation.