Photocurable Adhesive Display Waterproofing via Elastic Sealing
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Solution Overview
Problem
Existing display devices bonded with a photocurable adhesive lack sufficient waterproofness, especially when used outdoors, necessitating improved waterproofing from the display side.
Innovation Solution
A display device configuration featuring a metal frame body, a display unit with a cover plate and light-transmitting layer bonded using a photocurable adhesive, and an elastic member for waterproof sealing, along with a circuit substrate unit and accommodation body to prevent water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photocurable adhesive is used to bond the cover plate and display device, then display quality is maintained by reducing reflection on the air layer interface, but waterproofness is insufficient especially for outdoor use
Solution Approach 1:
The bonding system is divided into two distinct functional layers: a photocurable adhesive layer for optical bonding (reducing reflection) and a waterproof coating layer applied on top for water resistance. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The solution uses a composite structure combining the photocurable adhesive material with a waterproof coating material. This composite approach integrates the optical properties of the adhesive with the waterproof properties of the coating, achieving both low reflection and high water resistance.
2Illumination intensity
If the cover plate and display are bonded directly with photocurable adhesive, then optical performance is optimized, but water entry risk increases from the display side
Solution Approach 1:
The waterproof coating acts as an intermediary layer between the photocurable adhesive and the external environment. It mediates between the optical bonding requirements (maintaining adhesive exposure) and waterproofing requirements (blocking water), allowing both functions to coexist.
Solution Approach 2:
A thin film waterproof coating is applied over the bonded interface. This thin film provides effective water barrier protection while being sufficiently transparent to allow UV light transmission for photocuring and not significantly interfering with display optical quality.
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 configuration achieves high waterproofness from the display side by using a photocurable adhesive for optical bonding and an elastic member for sealing, effectively reducing water entry and maintaining display quality.
Implementation Method 1
a transparent cover plate and a liquid crystal display device are bonded by a photocurable adhesive
Data Source
Figure 1~2
Figure 3(a)~3(b)
Figure 4(a)~4(b)
AI summary
The present invention addresses the problem of providing a display device that excels in waterproofness against moisture from a display side. A display device (1) is provided with: a display (21) for displaying an image on a display surface (21a); a cover plate (22) located on the display surface (21a) side of the display (21), the cover plate (22) having a light-transmitting section for making the display surface (21a) visible; an elastic member (24) provided so as to cover the side circumferential section of the cover plate (22); and an accommodation body (40) having an open section that is open toward the cover plate (22) side and a protruding section (44) encircling the open section and protruding to the outer circumferential side of the open section. The display (21) is bonded to the cover plate (22) with a photocurable adhesive. The cover plate (22) is secured via the elastic member (24) to the protruding section (44) by a caulked metal frame body (10).