Touch Panel Repair Using Opaque Alignment Marks
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Solution Overview
Problem
The existing touch panel repair methods face challenges in accurately aligning and forming contact holes due to the transparent nature of sensing pads, leading to difficulties in repairing open circuits caused by static electricity or scratches, which reduces the yield and efficiency of touch sensing arrays.
Innovation Solution
Incorporating non-transparent conductive repair marks on the touch sensing pads, which serve as alignment marks and allow for easier formation of repair lines and contact holes, improving positioning accuracy and repair efficiency by reflecting and concentrating laser energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transparent sensing pads are used for the touch sensing array, then the touch sensing function is achieved, but positioning accuracy during repair deteriorates
Solution Approach 1:
A transparent alignment mark layer is introduced as an intermediary between the transparent sensing pads and the repair equipment. This alignment mark layer contains opaque or differently transparent patterns that serve as reference markers, enabling repair equipment to accurately locate and align with the transparent sensing pads without interfering with their sensing function.
Solution Approach 2:
The alignment mark layer uses differences in transparency or optical properties (analogous to color changes) to create visible contrast between the alignment marks and the surrounding transparent sensing pads. This allows repair equipment to detect and align with the correct positions while maintaining the transparency needed for touch sensing operation.
2Reliability
If transparent sensing pads are used, then the touch sensing function is maintained, but the ease of forming contact holes deteriorates
Solution Approach 1:
The alignment mark layer serves as a mediator that concentrates laser energy during contact hole formation. The opaque or differently transparent patterns in this layer absorb and focus laser energy at specific locations, making it easier to form contact holes through the protective layer and into the transparent sensing pads below.
Solution Approach 2:
The invention changes the optical parameters of the repair structure by introducing a layer with different transparency characteristics. This modification alters how laser energy interacts with the structure, enabling more efficient contact hole formation while preserving the original transparent sensing pad functionality.
3Ease of manufacture
If more laser energy is used to form contact holes on transparent sensing pads, then contact holes can be formed, but repair efficiency deteriorates
Solution Approach 1:
By introducing the alignment mark layer with different optical properties, the laser energy absorption and concentration parameters are improved. This allows contact holes to be formed with optimized laser energy levels, reducing the time and power required while maintaining effective contact hole formation capability.
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 use of non-transparent conductive repair marks enhances the alignment process and facilitates the formation of contact holes, thereby increasing the efficiency and accuracy of the repair process, reducing the resistance of the touch sensing array and improving the reliability of the touch panel.
Implementation Method 1
conductive repair marks...allow for easier formation of repair lines and contact holes, improving positioning accuracy and repair efficiency by reflecting and concentrating laser energy
Data Source
AI summary
A touch display panel contains a display panel and a touch sensing array. The touch sensing array is disposed on the display panel, wherein the touch sensing array includes a plurality of first transparent sensing series, a plurality of second transparent sensing series, and a plurality of conductive repair marks. The first transparent sensing series are arranged along a first direction. Each of the first transparent sensing series includes a plurality of first transparent sensing pads electrically connected with each other; the second transparent sensing series are arranged along a second direction. Each of the second transparent sensing series includes a plurality of second transparent sensing pads electrically connected with each other, and each first transparent sensing pad is isolated from each second transparent sensing pad. The conductive repair marks are disposed corresponding to the first transparent sensing pads or the second transparent sensing pads.