3D Display Retarder Adhesion Resolving Thermal Misalignment
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Solution Overview
Problem
Existing three-dimensional image display apparatuses face challenges with deformation and misalignment during manufacturing due to thermal expansion and uneven surfaces, leading to poor adhesion between the image display section and the retarder, which affects image quality and alignment.
Innovation Solution
A manufacturing method involving an adhesion region with a higher glass transition temperature resin is applied to the periphery of both the image display section and the retarder, ensuring proper alignment and adhesion by curing the resin at a temperature below its glass transition point, while maintaining the adhesive in a rubbery state to accommodate thermal expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an adhesive with low glass transition temperature is used to accommodate deformation and unevenness, then the adhesive can deform flexibly to absorb thermal expansion and surface irregularities, but the adhesive is likely to creep when experiencing heat and force during manufacturing and usage, causing misalignment
Solution Approach 1:
The patent applies different adhesive properties to different regions: the pixel region adhesion layer uses low glass transition temperature adhesive for flexibility and deformation accommodation, while the peripheral region adhesion layer uses high glass transition temperature adhesive for dimensional stability and alignment precision. This local differentiation resolves the contradiction between adaptability and manufacturing precision.
Solution Approach 2:
The adhesion structure is segmented into two distinct regions: pixel region adhesion layer and peripheral region adhesion layer. Each region is assigned different adhesive materials with appropriate glass transition temperatures based on their functional requirements, allowing simultaneous achievement of flexibility and precision.
2Adaptability or versatility
If the adhesive is kept in rubbery state during curing to accommodate thermal expansion, then the adhesive can absorb deformation, but the adhesive may not provide sufficient structural support and alignment stability
Solution Approach 1:
The patent assigns different mechanical states to different adhesive regions based on local requirements. The pixel region adhesive remains in rubbery state for thermal expansion absorption, while the peripheral region adhesive is cured to glassy state for structural support and alignment stability.
Solution Approach 2:
The adhesion system is segmented into functional zones with different curing states. The peripheral region provides structural framework with cured adhesive, while the pixel region maintains flexibility with uncured adhesive, resolving the contradiction between strength and adaptability.
3Device complexity
If a single adhesion layer is used between the image display section and retarder, then the structure is simple, but it cannot simultaneously accommodate deformation and maintain precise alignment under high-temperature conditions
Solution Approach 1:
The adhesion system is segmented into pixel region and peripheral region layers with different functions. This segmentation enables simultaneous achievement of deformation accommodation and alignment stability without excessive overall complexity.
Solution Approach 2:
Different adhesive properties are assigned to different regions to meet local requirements. The peripheral region provides structural stability for alignment, while the pixel region provides flexibility for deformation accommodation, resolving the contradiction between simplicity and precision.
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 method effectively prevents deformation and misalignment, enhancing image quality by maintaining a consistent distance between the image display section and the retarder, reducing optical interference and crosstalk, and ensuring stable adhesion even under high-temperature conditions.
Implementation Method 1
the adhesive forming the adhesion layer is required to be flexible enough to be capable of deforming in response to the deformation of the image display section and the retarder
Implementation Method 2
the image display section and the retarder expand/contract when heated up/cooled down during the manufacturing process
Implementation Method 3
curing the resin at a temperature below its glass transition point
Implementation Method 4
a glass transition temperature of an adhesive forming the adhesion region being higher than a glass transition temperature of an adhesive forming the adhesion layer
Data Source
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AI summary
It is aimed to reduce the occurrence of crosstalk attributable to the thermal expansion/contraction of a retarder and an image display section, and the unevenness in color attributable to the uneven surfaces of the retarder and the image display section. It is also aimed to reduce the misalignment of the retarder with respect to the image display section. The exit surface of an image display section 130 and the entrance surface of a retarder 180 are adhered to each other by using an adhesion layer 300. Additionally, the left and right edges of the image display section 130 are adhered to the left and right edges of the retarder 180 by using adhesion regions 400. Here, the adhesion regions 400 have a higher glass transition temperature than the adhesion layer 300.