Touch Screen Insulating Light-Shielding Strip Design
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Solution Overview
Problem
Full screen touch display devices face a light reflection problem due to visible metal wires at the edges of the screen, which affects the product's appearance and quality, especially when the screen is off and black.
Innovation Solution
A touch screen design incorporating an insulating light-shielding strip made of black ink, formed by inkjet printing, which covers the metal wire exposed by a notch in the polarizer, extending to the polarizer and flexible circuit board, and a cover plate with a transparent window area and shielding area, creating a gap to absorb incident light and prevent reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the frame size is narrowed to achieve full screen technology, then the screen-to-body ratio is improved, but light reflection from metal wires at the edge becomes visible and affects appearance quality
Solution Approach 1:
An insulating light-shielding strip is introduced as an intermediary component between the metal wire and the external environment. This strip covers the metal wire at the edge of the effective display area, preventing light from reflecting off the metal wire and making it visible. The strip acts as a mediator that eliminates the harmful visual effect while maintaining the narrow frame design.
Solution Approach 2:
The light-shielding strip is applied locally only at the edge of the effective display area where the metal wire is exposed, rather than covering the entire screen. This localized treatment addresses the specific problem of light reflection at the boundary while preserving the overall transparency and visual quality of the display area.
2Object-affected harmful factors
If a light-shielding strip is added to cover the metal wire, then light reflection is reduced, but the device structure becomes more complex
Solution Approach 1:
The light-shielding strip combines multiple functions into a single component: it provides electrical insulation to prevent short circuits, blocks light to prevent reflection visibility, and serves as a structural element that can be integrated with the bonding layer or touch sensor layer. This multi-functionality reduces the need for separate components and simplifies the overall device structure.
Solution Approach 2:
The insulating light-shielding strip is designed to serve multiple purposes simultaneously: electrical insulation, optical shielding, and structural support. By making this single component universal in its functionality, the patent avoids adding extra specialized components that would increase device complexity.
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 effectively absorbs light and prevents the metal wire from being visible, enhancing the product's visual effect and quality by reducing light reflection, thus improving the appearance and functionality of full screen touch display devices.
Implementation Method 1
an insulating light-shielding strip covering the at least a portion of the metal wire exposed by the notch and extending to a side of the polarizer close to the substrate
Data Source
Figure 1a~1b
Figure 1c~2a
Figure 2b~3
AI summary
The present disclosure provides a touch screen, a manufacturing method thereof, and a touch display device. The touch screen includes: a substrate; a touch layer and a bonding layer that are on a side of the substrate, wherein the bonding layer is connected to the touch layer by a metal wire; a flexible circuit board connected to the bonding layer; a polarizer on a side of the touch layer away from the substrate and provided with a notch exposing the bonding layer and at least a portion of the metal wire; an insulating light-shielding strip covering the portion of the metal wire exposed by the notch and extending to a side of the polarizer close to the substrate; and a cover plate on a side of the polarizer away from the substrate and including a transparent window area and a shielding area around the transparent window area, wherein an orthographic projection of the touch layer on the cover plate is in the transparent window area, there is provided with a gap between the orthographic projection and the shielding area, and the insulating light-shielding strip includes a portion exposed by the gap.