Touch Panel Light Transmission Protrusion for Adhesive Curing
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Solution Overview
Problem
In touch display devices using one-glass solutions (OGS), the light shielding layer obstructs light from curing the light curable adhesive in non-visual regions, leading to incomplete curing and potential adhesive leakage, which affects the image quality and manufacturing yield.
Innovation Solution
Incorporating a light transmission protrusion on the protective layer of the touch panel, positioned in the non-visual region, allows light to enter and refract, ensuring complete curing of the light curable adhesive between the touch and display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light shielding layer is disposed in the non-visual region to prevent adhesive leakage, then adhesive leakage is prevented, but the light curable adhesive cannot be completely cured due to light blockage
Solution Approach 1:
The light shielding layer is segmented by introducing light transmission protrusions that penetrate through it, creating localized transparent regions. This segmentation allows light to pass through specific areas to cure the adhesive while maintaining shielding in other areas to prevent adhesive leakage into the visual region.
Solution Approach 2:
Light transmission protrusions act as intermediaries between the light source and the light curable adhesive in the non-visual region. These protrusions enable light to reach and cure the adhesive that would otherwise be blocked by the light shielding layer, while the surrounding shielded areas prevent uncured adhesive from leaking.
2Manufacturing precision
If light is provided from the second surface to cure the light curable adhesive, then adhesive curing is achieved, but the light shielding layer blocks light from reaching adhesive in non-visual regions
Solution Approach 1:
The light shielding layer is designed with localized light transmission protrusions that create regions of different optical properties. The protrusions provide high light transmission intensity specifically where needed in the non-visual region, while the surrounding areas maintain high shielding intensity to prevent adhesive leakage.
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 enhances light curing efficiency, preventing adhesive leakage and improving the assembly yield of touch display devices by ensuring complete curing of the adhesive, even in obstructed areas.
Implementation Method 1
a light enters the light transmission protrusion from the second surface
Implementation Method 2
illuminates and cures the light curable adhesive
Data Source
AI summary
A touch panel including a substrate, a light shielding layer, a touch sensing device layer, a protective layer, and at least one light transmission protrusion is provided. The substrate has a first surface and a second surface opposite to the first surface, wherein the first surface is divided into a visual region and a non-visual region. The light shielding layer is disposed in the non-visual region. The touch sensing device layer is disposed on the first surface of the substrate. The protective layer disposed on the first surface of the substrate covers the light shielding layer and the touch sensing device layer. The light transmission protrusion is disposed on the protective layer, and at least part of the light transmission protrusion is in the non-visual region. A light enters the light transmission protrusion from the second surface. A touch display device and an assembling method thereof are also provided.