Touch Sensor Metal Bridge Light Reflection Blocking
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Solution Overview
Problem
The high reflectivity of metal bridges in touch screens, such as OGS, on-cell, and in-cell types, affects the visual effect by causing reflected light that stimulates the human eye, which existing technologies have not adequately addressed.
Innovation Solution
A touch sensor design that incorporates a blocking pattern, formed of low-reflectivity materials like black photoresist or black metal oxides, positioned to correspond with the metal bridge, along with a black matrix frame of the same material, to block the metal bridge and reduce light reflection, while maintaining the same shape and size as the metal bridge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal bridge is used in the touch screen, then the electrical conductivity is improved, but the visual effect deteriorates due to high reflectivity
Solution Approach 1:
A blocking pattern layer is introduced as an intermediary between the metal bridge and the external environment. This layer selectively blocks light from reaching the metal bridge while allowing electrical signals to pass through, thereby eliminating the harmful light reflection effect without compromising the electrical conductivity function of the metal bridge
Solution Approach 2:
The blocking pattern is applied locally only at the position of the metal bridge rather than uniformly across the entire touch screen. This localized application ensures that light reflection is blocked only where the metal bridge creates visual interference, while maintaining transparency and visual quality in other regions of the display
2Object-affected harmful factors
If a blocking pattern is added to block the metal bridge, then the visual effect is improved, but the device complexity increases
Solution Approach 1:
The blocking pattern layer is merged with the existing touch sensor structure by integrating it into the existing layer stack. The blocking pattern is formed using the same transparent insulating material as other layers in the structure, and is incorporated during the existing manufacturing process sequence, thereby adding minimal structural complexity while achieving the light blocking function
3Object-affected harmful factors
If a blocking pattern is added to block the metal bridge, then the visual effect is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The blocking pattern is formed in advance during the manufacturing process, specifically after the metal bridge is formed but before final assembly. The blocking pattern is created by depositing transparent insulating material and patterning it to cover the metal bridge, thereby preparing the light-blocking structure before subsequent manufacturing steps are performed
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 reduces light reflection from the metal bridge, making it invisible under natural light, improving the visual effect by ensuring the metal bridge does not interfere with light passage and maintaining the display's normal appearance, while also simplifying the manufacturing process and reducing costs.
Implementation Method 1
the blocking pattern is formed of a black photoresist or a black metal oxide material
Data Source
AI summary
Embodiments of the present invention disclose a touch sensor, a method of manufacturing the touch sensor, and a touch screen and an electronic product which include the touch sensor. The touch sensor includes: a substrate; a blocking pattern formed on the substrate; and a metal bridge. The blocking pattern is formed in a region corresponding to the metal bridge on the substrate and is configured to block the metal bridge.