Touch Panel Wire Arrangement for Anti-Static Reliability
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Solution Overview
Problem
Touch panels in wearable devices face poor anti-static ability due to significant impedance differences among wires, leading to preferential damage of wires with lower impedance during static electricity exposure, which compromises the overall touch panel performance.
Innovation Solution
The touch panel design includes multiple first and second touch-electrodes with connection ends arranged such that the maximum impedance difference between corresponding wires is minimized, ensuring that all first and second touch-electrodes' connection ends are located on the same side, reducing the impedance variation and preventing static electricity from damaging specific wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wires are entered from two sides and winded in the bezel region to connect touch-electrodes to the flexible circuit board, then the touch panel can be connected to the circuit board, but the impedance difference among wires becomes large causing poor anti-static capability
Solution Approach 1:
The patent merges the connection ends of multiple touch-electrodes to be located at the same side of the touch region. This combining approach allows wires to be routed more uniformly, reducing impedance differences and improving anti-static capability while simplifying the overall wire arrangement in the bezel region.
Solution Approach 2:
The patent achieves equipotentiality by ensuring that connection ends of touch-electrodes are positioned at the same side, making the wire lengths and impedances more uniform. This equalizes the electrical characteristics among different wire paths, preventing preferential damage during static electricity events.
2Reliability
If wires are winded in the bezel region from different sides, then all touch-electrodes can be connected, but wires with lower impedance are preferentially damaged by static electricity
Solution Approach 1:
The patent merges the connection ends of multiple touch-electrodes to be located at the same side of the touch region. This combining approach allows wires to be routed more uniformly, reducing impedance differences and improving anti-static capability while simplifying the overall wire arrangement in the bezel region.
Solution Approach 2:
The patent applies local quality by concentrating the connection ends of touch-electrodes at a specific location (the same side of the touch region). This localized arrangement optimizes the wire routing path, ensuring uniform impedance characteristics and enhanced resistance to static electricity damage.
3Device complexity
If connection ends are distributed at different sides of the touch region, then wire routing is simplified, but impedance variation among wires increases
Solution Approach 1:
The patent merges the connection ends of multiple touch-electrodes to be located at the same side of the touch region. This combining approach allows wires to be routed more uniformly, reducing impedance differences and improving anti-static capability while simplifying the overall wire arrangement in the bezel region.
Solution Approach 2:
The patent achieves equipotentiality by ensuring that connection ends of touch-electrodes are positioned at the same side, making the wire lengths and impedances more uniform. This equalizes the electrical characteristics among different wire paths, preventing preferential damage during static electricity events.
Data Source
AI summary
A touch panel includes first touch-electrodes and second touch-electrodes, and a bezel region includes first wires and second wires. Each of the first wires is electrically connected a respective one of the first touch-electrodes in a one-to-one correspondence through a respective first connection end, and each of the second wires is electrically connected a respective one of the second touch-electrodes in a one-to-one correspondence through a respective second connection end. First connection ends of at least two adjacent first sub-touch-electrodes located at a central position of the touch region in the second direction are located at a same side of the touch region in the first direction, and/or second connection ends of at least two adjacent second sub-touch-electrodes located at a central position of the touch region in the first direction are located at a same side of the touch region in the second direction.