Electronic Device Stack Assembly with Yellow-Pigmented Tape
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Solution Overview
Problem
Portable electronic devices, such as e-book readers, face challenges in balancing durability with weight, as increasing durability often results in increased weight due to structural strengthening, making it difficult to create devices that can withstand accidental falls while maintaining lightness.
Innovation Solution
The solution involves a stack assembly with a light sub-assembly comprising LED light sources and a light guide, adhered with optically clear adhesive, and a capacitive touch sensor, using yellow-pigmented tape for uniform color and black tape to absorb stray light, along with stiffener members and autoclave processes for improved rigidity and adhesion, and sealing materials for moisture protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If structural strengthening is increased to improve durability, then the device can withstand accidental falls and impacts, but the weight of the device increases
Solution Approach 1:
The device is divided into multiple functional layers (display sub-assembly, light sub-assembly, touch-sensitive panel sub-assembly) that can be independently optimized. Each layer contributes to overall durability without requiring the entire device structure to be heavily reinforced, thus maintaining lightweight characteristics while achieving adequate durability.
Solution Approach 2:
The patent employs composite material structures within each sub-assembly, combining materials with different properties to achieve optimal strength-to-weight ratios. For example, the display sub-assembly integrates multiple functional layers with different mechanical properties that work together to provide durability without excessive weight.
2Adaptability or versatility
If multiple functional layers are integrated to improve device functionality, then the device provides touch-sensitive, front-lit display capabilities, but the device complexity increases
Solution Approach 1:
Multiple functional components are merged into integrated sub-assemblies. The display sub-assembly combines display elements with structural support functions, the light sub-assembly integrates lighting with uniformity control features, and the touch-sensitive panel sub-assembly combines touch sensing with structural protection. This merging reduces the number of separate components and simplifies the overall assembly process.
Solution Approach 2:
Each sub-assembly is designed to perform multiple functions simultaneously. For example, the display sub-assembly serves both as the visual display medium and as a structural component of the stack assembly. The light sub-assembly provides both illumination and optical uniformity control. This multi-functionality reduces the total number of components needed.
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 configuration enhances the durability and weight efficiency of electronic devices by providing a touch-sensitive, front-lit display capable of functioning in low ambient light conditions while maintaining a lightweight design.
Implementation Method 1
a second optically clear adhesive layer 222 between the display sub-assembly 230 and the light sub-assembly 220
Implementation Method 2
a first tape layer 324, which is predominantly yellow in color, is applied along one edge of the light guide 322
Implementation Method 3
a second tape layer 326, which is predominantly black in color, is applied along one edge of the light guide 322
Data Source
AI summary
An electronic device includes a stack assembly and a cover glass. The stack assembly includes an electrophoretic display sub-assembly for rendering content, a front light sub-assembly comprising a light guide, a light FPC, and a plurality of light sources, and a capacitive touch sensing sub-assembly for detecting touch inputs. A yellow-pigmented tape is applied over the light sources and an edge of the light guide. A stiffener member is coupled to the light FPC opposite the yellow-pigmented tape.