Offset Electrode Substrate Assembly for Bubble-Free Bonding
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Solution Overview
Problem
Conventional touch display panels face issues of stress concentration, electrode fragmentation, poor adhesion, and electrode corrosion due to right angle collisions and difficulty in removing bubbles between first and second electrodes.
Innovation Solution
The substrate assembly design includes first and second electrodes with offset distances and asymmetrical edges, preventing right angle collisions and creating exhaust gaps for bubble removal, enhancing adhesion and reducing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first electrodes and second electrodes are fully connected with right angles aligned, then the electrical connection is complete, but stress concentration causes electrode fragmentation and poor adhesion
Solution Approach 1:
The patent applies asymmetry by designing the first electrodes with different width specifications compared to the second electrodes. Specifically, the first electrodes have a first width specification while the second electrodes have a second width specification that is different from the first. This asymmetric design prevents the right angle edges from fully aligning and colliding, thereby avoiding stress concentration and electrode fragmentation while maintaining complete electrical connection.
2Reliability
If the first electrodes and second electrodes are fully connected, then electrical connectivity is achieved, but bubbles between the electrodes are difficult to remove
Solution Approach 1:
The asymmetric width design creates offset between the first and second electrodes, forming exhaust gaps that facilitate bubble removal during the bonding process. The different width specifications ensure that the electrodes do not fully overlap, leaving spaces through which trapped bubbles can escape, thus improving ease of manufacture without compromising electrical connectivity.
3Area of stationary object
If the electrode edges are aligned at right angles, then the bonding area is maximized, but stress concentration leads to electrode corrosion
Solution Approach 1:
By designing electrodes with asymmetric width specifications, the patent prevents complete edge alignment while maintaining substantial bonding area. The offset created by different widths distributes stress more evenly across the bonding interface, avoiding the stress concentration that occurs at right angle collisions, thereby preventing electrode corrosion while preserving adequate bonding area.
Data Source
AI summary
A substrate assembly is provided, including a first substrate, an active element layer, a plurality of first electrodes, a circuit substrate, and a plurality of second electrodes. The active element layer is disposed on the first substrate. The plurality of first electrodes are disposed on the first substrate and arranged along a first direction. The circuit substrate is partially overlapping the first substrate in a vertical projection direction. The plurality of second electrodes are disposed on the circuit substrate. A distance between the edge of one of the plurality of second electrodes and the edge of one of the plurality of first electrodes is greater than zero in the first direction, and a width of the one of the plurality of first electrodes is different from a width of the one of the plurality of second electrodes.