Electrophoretic Display Device with Asymmetric Optical Adhesive Layers
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Solution Overview
Problem
Conventional flexible electrophoretic display devices lack sufficient impact resistance, leading to potential damage and abnormal display when subjected to external forces due to insufficient strength in the functional layers.
Innovation Solution
A display device configuration with a display panel, a barrier layer, a protective layer, and two optical adhesive layers, where the first optical adhesive layer between the display panel and the barrier layer has a larger thickness than the second optical adhesive layer between the protective and barrier layers, utilizing optical clear adhesive and materials like silicon dioxide and polyethylene terephthalate to enhance impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional functional layer configuration is used, then the display device can be manufactured with standard processes, but the impact resistance strength is insufficient leading to potential damage under external forces
Solution Approach 1:
The functional layer is segmented into three distinct layers: a protective layer (122) for impact resistance, a barrier layer (124) for moisture prevention, and an optical adhesive layer (126) for bonding. This segmentation allows each layer to specialize in its function, with the protective layer specifically addressing the impact resistance weakness of conventional single-layer designs.
Solution Approach 2:
The display device uses a composite structure combining different materials with complementary properties: the protective layer uses impact-resistant material, the barrier layer uses moisture-blocking material, and the optical adhesive layer uses optically clear bonding material. This composite approach achieves both high impact resistance and moisture protection without requiring a single complex material.
2Length of stationary object
If the optical adhesive layer is made thinner to reduce overall device thickness, then the device becomes more compact, but the impact resistance strength decreases making the display panel more vulnerable
Solution Approach 1:
By separating the protective function from the bonding function into different layers, the design allows the protective layer to be optimized for impact resistance while the optical adhesive layer can be kept thin for compactness. The protective layer absorbs impact forces before they reach the thinner adhesive layer and display panel.
Solution Approach 2:
The protective layer is positioned between the external environment and the barrier layer to provide beforehand cushioning against impact forces. This layer absorbs and distributes impact energy before it can damage the underlying display panel and internal layers, enabling the use of thinner adhesive layers without compromising overall impact resistance.
Data Source
AI summary
A display device includes a display panel, a barrier layer, a protective layer, a first optical adhesive layer and a second optical adhesive layer. The barrier layer is disposed above the display panel. The protective layer is disposed above the barrier layer. The first optical adhesive layer with a first thickness is disposed between the display panel and the barrier layer. The second optical adhesive layer with a second thickness is disposed between the protective layer and the barrier layer. The first thickness is larger than the second thickness.