Touch Panel Display Reinforcement Layer Bending Stress
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Solution Overview
Problem
Touch panels in display devices are prone to breakage or damage due to bending stress, which can lead to operational failures.
Innovation Solution
Incorporating a reinforcement layer made of oxide semiconductor materials, such as zinc oxide or indium-gallium-zinc oxide, between the touch panel and the window, or between the touch panel and the resin layer, to absorb and reduce bending stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is attached to a display device, then the display device gains touch input functionality, but the touch panel becomes susceptible to breakage due to bending stress
Solution Approach 1:
A reinforcement layer is introduced as an intermediary component between the touch panel and the display device structure. This reinforcement layer acts as a mediator that distributes and reduces bending stress, preventing direct transmission of stress to the touch panel while maintaining touch input functionality.
Solution Approach 2:
The reinforcement layer is constructed using composite materials, specifically an oxide semiconductor layer (such as IZO - indium zinc oxide) combined with a reflective layer. This composite structure provides both mechanical reinforcement to resist bending stress and optical functionality for display enhancement.
2Volume of moving object
If the touch panel is positioned close to the display panel for compact design, then device thickness is reduced, but bending stress on the touch panel increases
Solution Approach 1:
The reinforcement layer is positioned beforehand between the touch panel and the display panel structure to provide stress cushioning. This layer absorbs and distributes bending stress before it reaches the touch panel, enabling compact design with reduced thickness while protecting against increased stress.
3Reliability
If a reinforcement layer is added to protect the touch panel, then durability is improved, but device complexity increases
Solution Approach 1:
The reinforcement layer serves multiple functions simultaneously: it provides mechanical reinforcement to prevent breakage, acts as a reflective layer for display enhancement, and maintains structural integrity. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The reinforcement layer is merged with the reflective layer, combining structural reinforcement and optical reflection functions into a single integrated layer. This merging approach protects the touch panel while avoiding the complexity of adding separate reinforcement and reflective components.
Data Source
AI summary
A touch panel display device including a display panel displaying an image; a polarizing plate attached onto the display panel; a touch panel on and spaced apart from an upper portion of the polarizing plate; a resin layer between the touch panel and the polarizing plate, the resin layer bonding the touch panel and the polarizing plate; a window on the touch panel; and a reinforcement layer between the window and the touch panel or between the touch panel and the resin layer, wherein the reinforcement layer prevents damage to the touch panel caused by bending stress.