Display Support Structures with Encapsulant Stress Absorption
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Solution Overview
Problem
Electronic devices face challenges in mounting displays and display cover layers, often resulting in bulky components and excessively wide inactive border regions due to inadequate mounting techniques.
Innovation Solution
The use of encapsulant materials with varying elasticity and rigid outer materials, such as molded polymers or metal frames, to couple the display cover layer to the housing sidewalls, allowing the active display area to extend closer to the edges while absorbing mechanical stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional mounting techniques are used to attach display and cover layer, then the display components are protected and mounted securely, but the device becomes bulky and develops excessively wide inactive border regions
Solution Approach 1:
The mounting structure is segmented into multiple functional layers: a first encapsulant material directly surrounding the display, a second encapsulant material surrounding the first, and a rigid frame member providing external support. This segmentation allows each layer to perform its specific function optimally while minimizing overall device bulk.
Solution Approach 2:
The patent employs composite materials with different mechanical properties - soft encapsulant materials (epoxy, polyimide, silicone) combined with a rigid frame member (metal or plastic). This composite structure provides both protection and structural support, enabling the active display area to extend closer to the edges without compromising strength.
2Area of stationary object
If the display active area is extended closer to the edges of the device, then the inactive border regions are minimized, but the display becomes more vulnerable to mechanical stresses and damage
Solution Approach 1:
The first encapsulant material is applied beforehand to directly surround and cushion the display edges before the display is mounted in the device. This pre-application of protective material absorbs mechanical stresses and prevents direct transmission of forces to the fragile display components.
Solution Approach 2:
The patent changes the mechanical parameters of the mounting structure by using materials with different elastic moduli - the soft encapsulant materials (low elastic modulus) absorb stresses, while the rigid frame member (high elastic modulus) provides structural support. This parameter variation enables the display to extend to the edges while maintaining reliability.
3Strength
If a rigid structure is used to support the display and cover layer, then mechanical strength is improved, but the structure cannot absorb mechanical stresses effectively
Solution Approach 1:
Different parts of the mounting structure have different mechanical qualities tailored to their specific functions: the encapsulant materials directly contact and protect the display with soft, stress-absorbing properties, while the outer frame member provides rigid structural support. This local differentiation of material properties resolves the contradiction between strength and stress absorption.
Solution Approach 2:
The patent creates a composite mounting structure combining soft encapsulant materials with a rigid frame member. The encapsulant materials (epoxy, polyimide, or silicone) provide stress absorption and protection, while the rigid frame provides overall structural support, allowing the system to achieve both strength and reliability simultaneously.
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 minimizes inactive border regions and enhances the robustness of the display by effectively transferring mechanical stresses to the housing, thereby expanding the active display area and reducing the risk of damage.
Implementation Method 1
An outer portion of the first encapsulant material may have a higher elastic modulus than an inner portion of the first encapsulant material
Implementation Method 2
the rigid outer material may transfer mechanical stresses on the cover layer to the housing
Data Source
AI summary
An electronic device may include a display, a cover layer overlapping the display, and a housing have housing sidewalls. An encapsulant material may surround at least part of the display and may be used to couple the cover layer to the housing sidewalls. A rigid outer material having a higher elastic modulus than the encapsulant material may also be used to couple the cover layer to the housing sidewalls. The rigid outer material may be a molded material that surrounds an outer perimeter of the encapsulant, or the rigid outer material may be a metal or plastic frame member having a C-shaped cross-section or other geometry. The display may overlap the housing sidewall. The encapsulant may absorb mechanical stresses on the cover layer to protect the display, whereas the rigid outer material may transfer mechanical stresses on the cover layer to the housing.