Optical Assembly Microstructure Bonding Prevents Wick Phenomenon
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Solution Overview
Problem
Conventional optical assemblies experience reduced brightness due to the 'wick phenomenon' and adhesive instability caused by inserting prisms into a liquid adhesive layer, which limits the exposed surface area and adhesive strength.
Innovation Solution
An optical assembly design where microstructures of the second optical film are not penetrated into the adhesive layer, using a thermally-curable or photo-curable material with acrylate functional groups for bonding, ensuring sufficient adhesive strength without the wick phenomenon, thereby maintaining brightness and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If prisms are inserted into the liquid adhesive layer to ensure enough contact area for adhesive stability, then adhesive strength is improved, but the exposed surface area of the prisms is reduced such that brightness decreases
Solution Approach 1:
The adhesive layer is pre-cured before the prisms are inserted. This preliminary curing action prevents the prisms from penetrating into the adhesive layer during insertion, thereby maintaining the exposed surface area of the prisms and preserving brightness while still ensuring adequate contact area for adhesive bonding.
Solution Approach 2:
The physical state of the adhesive layer is changed from liquid to solid (cured) before prism insertion. This parameter change prevents the capillary action that would otherwise cause the liquid adhesive to be drawn into the prisms, maintaining both adhesive strength and prism surface area.
2Reliability
If liquid adhesive layer is used before adhesion to ensure enough contact area, then adhesive stability is improved, but the wick phenomenon occurs where the adhesive layer seriously adheres to two sides of the prismatic tip, reducing exposed surface area and brightness
Solution Approach 1:
The adhesive layer is cured in advance before prism insertion. This preliminary action eliminates the capillary phenomenon by changing the adhesive from liquid to solid state, preventing it from being drawn into the prismatic tips while still providing stable bonding.
Solution Approach 2:
The adhesive layer undergoes a phase transition from liquid to solid through curing. This phase change prevents the capillary action that causes the wick phenomenon, maintaining the exposed surface area of the prisms and preserving brightness while ensuring adhesive stability.
3Strength
If prisms are inserted into adhesive layer to guarantee contact area for adhesive stability, then adhesive strength is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The adhesive layer is cured before prism insertion, which simplifies the manufacturing process by eliminating the need for complex control mechanisms to prevent prism penetration. The pre-cured state naturally prevents the wick phenomenon without requiring additional process steps.
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 enhances the adhesive strength and maintains or improves the brightness of the optical assembly by preventing the microstructures from penetrating into the adhesive layer, thus avoiding the wick phenomenon and ensuring strong chemical bonding.
Implementation Method 1
the adhesive layer comprises a thermally-curable material having a plurality of first acrylate functional groups
Implementation Method 2
bonded to the third surface of the adhesive layer with the plurality of microstructures being not penetrated into the adhesive layer
Implementation Method 3
the adhesive layer comprises a photo-curable material having a plurality of first acrylate functional groups
Data Source
AI summary
An optical assembly, comprising:a first optical film; an adhesive layer, wherein the adhesive layer is disposed on the first optical film, wherein the adhesive layer comprises a plurality of light-diffusing particles therein; and a second optical film comprising a plurality of microstructures that are boned to the adhesive layer without penetrating into the adhesive layer.