Front Panel Metal Frame Bonding for Display Wrinkle Prevention
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Solution Overview
Problem
Existing front panels for display devices face issues with wrinkle or peel-off due to thermal expansion rate differences between the design sheet and bonding members, misalignment during bonding, and durability concerns, especially in harsh environments.
Innovation Solution
A front panel design where a metal sheet is formed in a frame shape to surround the touch panel or transparent plate, bonded to the design sheet with an optical transparent double-sided tape, and integrated with the touch panel, allowing precise alignment and bonding before attachment to the housing, using a durable adhesive resistant to environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the design sheet is bonded to a resin housing, then the housing structure is simple and easy to manufacture, but thermal expansion rate differences cause wrinkles and peel-offs
Solution Approach 1:
A metal sheet with a thermal expansion rate equivalent to the design sheet is introduced as an intermediary bonding substrate. The design sheet is bonded to this metal sheet instead of directly to the resin housing, eliminating thermal expansion mismatches and preventing wrinkles and peel-offs during temperature changes.
Solution Approach 2:
The front panel employs a composite structure combining resin housing, metal sheet, and design sheet. The metal sheet serves as a thermal expansion-matched intermediate layer between the resin housing and design sheet, creating a multi-material composite that resolves the thermal expansion contradiction.
2Reliability
If the design sheet protrudes beyond the touch panel edge and is bonded to the housing, then thermal expansion issues are addressed, but misalignment occurs during bonding
Solution Approach 1:
The design sheet is preliminarily bonded to the metal sheet in a separate operation before the metal sheet is attached to the housing. This preliminary bonding establishes precise alignment between the design sheet and metal sheet, and subsequent attachment to the housing maintains this alignment, preventing misalignment issues.
3Ease of manufacture
If standard adhesives are used for bonding, then the bonding process is simple, but durability deteriorates in harsh environments like those with cutting fluids
Solution Approach 1:
The adhesive properties are changed to achieve resistance against harsh environmental factors such as cutting fluids. An adhesive with enhanced chemical resistance and durability is selected, modifying the bonding parameters to withstand corrosive environments while maintaining effective bonding.
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 design effectively prevents wrinkles and peel-offs, ensures precise alignment and high-quality display surfaces, and enhances durability by using a durable adhesive that resists environmental stressors like cutting fluids.
Implementation Method 1
the touch panel is bonded to a back face of the design sheet with an optical transparent double-sided tape
Implementation Method 2
using a durable adhesive resistant to environmental factors... a durable adhesive that resists environmental stressors like cutting fluids
Data Source
AI summary
In a front panel in which a design sheet, a touch panel, and a metal sheet are integrated, the touch panel is bonded to a back face of the design sheet with an optical transparent double-sided tape. The metal sheet is formed in a frame shape to surround a periphery of the touch panel and to have an outer shape which is identical to an outer shape of the design sheet and is bonded to the back face of the design sheet with an adhesive or a double-sided tape.