Electrophoretic Touch Display Moisture Barrier
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Solution Overview
Problem
Current electrophoretic display apparatuses lack effective waterproof features, leading to reduced product lifetime due to moisture exposure.
Innovation Solution
A touch display apparatus with a protective layer comprising an organic material layer and an inorganic material layer, where the inorganic material layer is between the electrophoretic structure and the organic material layer, providing high resistance to moisture and water vapor transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a physical button is used to control the electrophoretic display apparatus, then the control function is achieved, but the display area is reduced and the device size cannot be minimized
Solution Approach 1:
The control function is merged with the display surface by implementing a touch-sensitive protective layer that serves both as a display component and a control interface. Users can interact with the display by touching specific areas directly, eliminating the need for separate physical buttons and maximizing the usable display area.
Solution Approach 2:
The protective layer is designed to serve multiple functions: it protects the electrophoretic structure, acts as a touch sensing interface for control, and maintains display visibility. This multi-functional design eliminates the need for dedicated control components that would reduce display area.
2Ease of manufacture
If conventional single-layer protective structures are used, then the manufacturing process is simple, but the waterproof performance is insufficient leading to reduced product lifetime
Solution Approach 1:
The protective layer is constructed as a composite structure combining an organic material layer and an inorganic material layer. The organic layer provides flexibility and adhesion, while the inorganic layer provides superior moisture and water vapor barrier properties. This composite approach achieves excellent waterproof performance while maintaining manufacturability through established thin-film deposition techniques.
Solution Approach 2:
The protective function is segmented into multiple specialized layers: the organic material layer handles mechanical protection and flexibility, while the inorganic material layer specifically addresses moisture and water vapor barrier requirements. This segmentation allows each layer to be optimized for its specific function, achieving superior overall protection.
3Reliability
If the inorganic material layer thickness is increased to improve moisture blocking, then the waterproof performance is enhanced, but the light transmittance is reduced
Solution Approach 1:
The thickness of the inorganic material layer is precisely controlled within the range of 20 nm to 400 nm to optimize the balance between moisture blocking and light transmittance. This parameter optimization ensures sufficient barrier performance while maintaining adequate optical properties for display visibility.
Solution Approach 2:
The composite structure of organic and inorganic layers works synergistically to achieve both protection and optical performance. The organic material layer compensates for light transmittance reduction by providing optical clarity, while the inorganic layer provides the moisture barrier, allowing each layer to address its primary function without compromising the other.
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 blocks external moisture, reduces water vapor impact on the electrophoretic structure, and minimizes reactivity, thereby enhancing the durability and performance of the touch display apparatus.
Implementation Method 1
The inorganic material layer is located between the electrophoretic structure and the organic material layer... A material of the inorganic material layer comprises silicon dioxide (SiO2)... A combination of the protective layer and the at least one touch sensing layer has a water vapor transmission rate (WVTR) less than 0.01 g/m2·day
Data Source
AI summary
A touch display apparatus comprises an electrophoretic structure, a protective layer, and at least one touch sensing layer. The protective layer is disposed on the electrophoretic structure and comprises an organic material layer and an inorganic material layer. The inorganic material layer is located between the electrophoretic structure and the organic material layer. The material of the inorganic material layer comprises silicon dioxide (SiO2). The thickness of the inorganic material layer is from 20 nm to 400 nm. The touch sensing layer is disposed on one side of the protective layer.