Touch Sensing Electrode Protection During Oxygen Baking
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Solution Overview
Problem
The manufacturing process of touch sensing devices often results in increased sheet resistance of sensing electrode arrays when baked in the presence of oxygen, leading to reduced sensitivity due to oxidation, which affects the accuracy of touch points recognized by the control circuit.
Innovation Solution
A protective structure comprising an insulating pattern layer that covers the sensing electrodes, with openings corresponding to the electrodes, is used to isolate oxygen during high-temperature baking, preventing resistance changes and maintaining sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensing electrode arrays are baked in the presence of oxygen during manufacturing, then manufacturing process is completed, but sheet resistance increases due to oxidation
Solution Approach 1:
An insulating pattern layer is introduced as an intermediary between the oxygen-containing environment and the sensing electrode arrays during the baking process. This layer acts as a barrier that prevents direct contact between oxygen and the electrode surfaces, thereby preventing oxidation while allowing the baking process to proceed at high temperatures.
Solution Approach 2:
The insulating pattern layer creates a locally inert environment around the sensing electrode arrays during the baking process. By covering the electrodes with this oxygen-impermeable layer, the patent effectively isolates the electrodes from the oxygen-containing atmosphere, preventing oxidative reactions even when the overall manufacturing environment remains oxygen-rich.
2Productivity
If sheet resistance increases beyond threshold, then manufacturing is complete, but touch point recognition accuracy decreases
Solution Approach 1:
The insulating pattern layer is applied to the sensing electrode arrays before the baking process begins. This preliminary protective action ensures that when the high-temperature baking is subsequently applied, the electrodes are already shielded from oxidation, preventing resistance increase before it can occur.
Solution Approach 2:
The insulating pattern layer serves as a protective intermediary that maintains the electrical properties of the sensing electrodes during manufacturing. By preventing oxidation, this layer ensures that sheet resistance remains within acceptable thresholds, thereby preserving touch point recognition accuracy.
3Ease of manufacture
If high-temperature baking is applied to complete manufacturing, then manufacturing process is finished, but sensitivity of touch sensing device reduces
Solution Approach 1:
The insulating pattern layer creates a protective environment around the sensing electrodes during high-temperature baking. This localized inert barrier prevents oxidative reactions that would otherwise degrade the electrode materials and reduce device sensitivity, allowing the baking process to be completed without compromising performance.
Solution Approach 2:
The insulating pattern layer acts as a protective intermediary that enables the high-temperature baking process to proceed without harming the sensing electrodes. By isolating the electrodes from the harsh thermal and oxidative environment, this layer preserves the electrical and sensing properties of the device.
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 protective structure effectively stabilizes the sheet resistance of the sensing electrodes, enhancing the sensitivity of the touch sensing device without adding extra manufacturing processes, as shown by the comparison of sheet resistance curves with and without the protective structure.
Implementation Method 1
when the sensing electrode arrays are baked in the presence of oxygen, sheet resistance increases with rising temperature
Data Source
AI summary
The present disclosure relates to a touch sensing device comprising a plurality of sensing electrode units and an insulating pattern layer. The insulating pattern layer covers the plurality of sensing electrode units and has a plurality of openings that are not corresponding to plurality of sensing electrode units. The present disclosure also discloses a method for manufacturing the touch sensing device.