Touch Sensor Black Matrix Formation Sequence
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current touch sensors for display devices face challenges in achieving high transmittance and optical properties while maintaining touch sensing sensitivity, often interfering with additional functional devices like cameras and speakers due to their design.
Innovation Solution
A touch sensor design featuring a substrate layer with sensing electrodes and a black matrix, where the black matrix is formed before the electrodes to prevent thermal damage and improve light shielding, and the electrodes are constructed using transparent conductive oxide in a multilayer structure with bridge electrodes for enhanced connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the black matrix is formed after the sensing electrodes, then the manufacturing process is simpler, but the sensing electrodes suffer thermal damage during black matrix formation
Solution Approach 1:
The black matrix is formed in advance before the sensing electrodes are deposited. This preliminary action allows the black matrix to serve as a thermal barrier during subsequent electrode formation processes, preventing thermal damage to the electrodes while maintaining manufacturing simplicity.
2Ease of manufacture
If the black matrix is formed on the same layer as the sensing electrodes, then the manufacturing process is simplified, but the optical properties and transmittance are deteriorated
Solution Approach 1:
The black matrix and sensing electrodes are formed on different layers vertically stacked on the substrate. This dimensional separation allows both components to maintain their optimal properties - the black matrix provides effective light shielding in its layer while the electrodes on the upper layer maintain high transmittance and optical performance.
3Reliability
If the sensing electrodes are made with higher metal content to improve conductivity, then the electrical conductivity is improved, but the optical transmittance is reduced
Solution Approach 1:
The sensing electrodes are constructed as a composite structure with a lower electrode layer and an upper electrode layer. The lower layer provides electrical conductivity while the upper layer uses transparent conductive material to maintain high optical transmittance. This composite approach allows both electrical and optical requirements to be satisfied simultaneously.
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 design enhances the transmittance and optical properties of touch sensors, reducing interference with display device functions and improving touch sensing sensitivity while preventing thermal damage to the electrodes.
Implementation Method 1
the black matrix is formed by curing a black matrix material at 180° C. to 240° C.
Implementation Method 2
the sensing electrodes include a transparent conductive oxide
Data Source
AI summary
A touch sensor according to an embodiment of the present disclosure may include a substrate layer, sensing electrodes that are formed on the substrate layer, and a black matrix that is formed on the same layer as the sensing electrodes or on a lower portion of the sensing electrodes. It may be possible to prevent excessive thermal damage to the sensing electrode which may occur during forming the black matrix after the sensing electrode is formed.