One-Piece Shell and Film Structure for Bubble-Free Screen Attachment
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Solution Overview
Problem
Existing one-piece structures of shell and film for mobile devices often generate air bubbles during installation due to mismatched thickness, leading to poor display and touch effects.
Innovation Solution
A one-piece structure with a protective cover and bottom shell featuring avoidance gaps and elastic contacts to accommodate varying device thickness, ensuring the protective film is not overly deformed, allowing easy bubble-free attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective film is adhesively attached to the screen, then the display and touch effect is improved, but the assembly difficulty increases and air bubbles are easily generated
Solution Approach 1:
The cavity height is pre-set to be greater than the maximum thickness of the electronic device, creating excess space before assembly. This preliminary dimensional configuration allows the protective film to be attached without immediate constraint, enabling air bubble elimination through pressing while maintaining adhesive attachment benefits.
Solution Approach 2:
The cavity height parameter is deliberately designed to be variable and greater than the device thickness, creating a parameter buffer that accommodates thickness variations. This parameter change transforms the fixed-dimension problem into a flexible configuration that facilitates bubble-free assembly.
2Device complexity
If the cavity height is fixed to match device thickness, then the structure is compact, but air bubbles are generated when thickness varies
Solution Approach 1:
The cavity is pre-configured with excess height space before the protective film attachment. This preliminary dimensional configuration ensures that regardless of the actual device thickness variation, there is always sufficient space to accommodate the film without creating bubbles during the attachment process.
Solution Approach 2:
The extra cavity height acts as a cushion or buffer zone that compensates for thickness variations and assembly variations. This beforehand cushioning prevents the harmful effect of air bubble generation by providing dimensional tolerance, ensuring reliable bubble-free attachment across different device specifications.
3Device complexity
If the protective film is squeezed outward by the device, then the cavity height is less than device thickness, but the protective film arches outward causing bubbles
Solution Approach 1:
The cavity height is pre-configured to prevent the squeezing effect by being greater than the device thickness. This preliminary anti-action counteracts the potential harmful compression force before it can occur, maintaining the protective film's flat shape and preventing arching that would cause bubbles.
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 ensures a bubble-free installation process, improving user experience by maintaining optimal film alignment and functionality.
Implementation Method 1
a protective film (18) with an adhesive layer (182)
Implementation Method 2
the bottom shell is in elastic contact with the protective cover in the thickness direction of the electronic device
Data Source
AI summary
The present disclosure proposes a one-piece structure of a shell and a film, including: a protective cover and a bottom shell; wherein the protective cover includes a front frame and a protective film, the front frame being arranged on an outer edge of the protective film; the bottom shell includes a rear frame and a bottom plate arranged on the rear frame; the bottom plate is arranged opposite to the protective film, and the bottom shell is matched with the protective cover to enclose a cavity; an inner surface of the protective film is adhesively fixed to a screen of the electronic device, and the bottom shell is fixedly connected to the electronic device; an avoidance gap is defined between the bottom shell and the protective cover; and/or the bottom shell is in elastic contact with the protective cover.