Touch Display Electrode Layout With Guard Lines Against Signal Interference
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Solution Overview
Problem
Touch display apparatuses face issues with signal distortion and interference between touch electrodes and routing lines, which affect the accuracy of touch sensing and signal transmission.
Innovation Solution
The touch display apparatus incorporates a pen-tile structure with specific arrangements of touch electrodes and bridge electrodes on an encapsulating unit, including an inner guard line to minimize signal interference and improve touch sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch electrodes are disposed close to touch routing lines to enable electrical connection, then device complexity is reduced, but signal distortion and interference increase
Solution Approach 1:
A guard line is introduced as an intermediary element between the touch electrode and the touch routing line. This guard line acts as a mediator that blocks or reduces the electromagnetic interference from the routing line from reaching the touch electrode, thereby protecting the touch sensing signal while maintaining the close proximity configuration
Solution Approach 2:
The guard line, which itself is a conductive element that could potentially cause interference, is instead used to shield the touch electrode by being positioned between the electrode and the routing line. The guard line converts the potential harmful electromagnetic field into a controlled shielding effect, protecting the sensitive touch electrode
2Productivity
If touch routing lines are placed near touch electrodes for efficient signal transmission, then signal transmission efficiency is improved, but signal interference from routing lines increases
Solution Approach 1:
The guard line serves as an intermediary barrier between the touch routing line and the touch electrode. It is positioned such that it intercepts electromagnetic interference from the routing line before it can reach the electrode, while still allowing the routing line to maintain its close proximity for efficient signal transmission
Solution Approach 2:
The conductive elements are segmented into functionally distinct components: the touch electrode for sensing, the guard line for shielding, and the routing line for signal transmission. This segmentation allows each element to perform its specific function without interfering with the others, despite their close spatial arrangement
Data Source
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AI summary
A touch display apparatus is provided. The touch display apparatus may include a touch sensor on an encapsulating unit covering light-emitting devices. The touch sensor may include touch electrodes and bridge electrodes electrically connecting between the touch electrodes. Each of the touch electrodes may be electrically connected to the corresponding touch pad by one of touch routing lines. A guard line may be disposed between the touch electrodes and each touch routing line. A signal applied to the guard line may be different from a signal applied to adjacent touch routing line. Thus, in the touch display apparatus, a reduction in touch sensitivity due to a touch driving signal or a touch sensing signal applied by the touch routing lines may be prevented or at least reduced.