Touch Display Consolidated Wires for High Resolution
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Solution Overview
Problem
Touch display devices with a single layer structure face limitations in touch resolution due to space constraints and parasitic capacitance issues, which restrict the number of sensing electrodes and wires, thereby reducing accuracy and reliability.
Innovation Solution
A touch display device with sensing electrodes arranged in a specific pattern on a single layer, where each group of electrodes shares a wire, allowing for increased touch resolution by applying touch driving voltage in a time division manner and detecting touch detection voltage to determine which electrode is touched, while maintaining a reduced number of wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of sensing electrodes is increased to improve touch resolution, then the number of wires must also increase, but this increases device complexity and parasitic capacitance
Solution Approach 1:
Multiple sensing electrodes are merged and connected to a single wire through a shared connection structure. The patent shows that multiple electrodes (e.g., first sensing electrode and second sensing electrode) can be connected to the same wire, allowing one wire to serve multiple electrodes simultaneously. This merging approach increases the number of detectable electrodes without proportionally increasing the number of wires.
Solution Approach 2:
The patent introduces a temporal dimension to resolve the wire-electrode mapping problem. By sequentially activating different electrode groups through time-division multiplexing, the system can distinguish between multiple electrodes sharing the same wire. The control signal alternates between different electrode groups in time, allowing the touch detection circuit to identify which specific electrode was touched despite multiple electrodes sharing a common wire connection.
2Reliability
If the number of wires is reduced to decrease parasitic capacitance, then the number of sensing electrodes must be reduced, but this decreases touch resolution
Solution Approach 1:
Multiple sensing electrodes are merged and connected to a single wire through a shared connection structure. The patent shows that multiple electrodes (e.g., first sensing electrode and second sensing electrode) can be connected to the same wire, allowing one wire to serve multiple electrodes simultaneously. This merging approach increases the number of detectable electrodes without proportionally increasing the number of wires.
Solution Approach 2:
The patent implements periodic time-division multiplexing to sequentially activate different electrode groups. The control signal alternates between different electrode groups in time, allowing the touch detection circuit to identify which specific electrode was touched despite multiple electrodes sharing a common wire connection. This periodic activation pattern enables clear signal differentiation without requiring separate dedicated wires for each electrode.
3Device complexity
If sensing electrodes are disposed on a single layer to simplify structure, then space is limited, but this restricts the number of electrodes and reduces touch resolution
Solution Approach 1:
Multiple sensing electrodes are merged and connected to a single wire through a shared connection structure. The patent shows that multiple electrodes (e.g., first sensing electrode and second sensing electrode) can be connected to the same wire, allowing one wire to serve multiple electrodes simultaneously. This merging approach increases the number of detectable electrodes without proportionally increasing the number of wires.
Solution Approach 2:
The patent introduces a temporal dimension to resolve the wire-electrode mapping problem. By sequentially activating different electrode groups through time-division multiplexing, the system can distinguish between multiple electrodes sharing the same wire. The control signal alternates between different electrode groups in time, allowing the touch detection circuit to identify which specific electrode was touched despite multiple electrodes sharing a common wire connection.
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
This configuration enables a higher touch resolution with fewer wires, reducing parasitic capacitance and improving the accuracy of touch detection without increasing the number of wires, thus enhancing the reliability of the touch display device.
Implementation Method 1
The touch display device is largely classified into a mutual-capacitance type and a self-capacitance type depending on the disposition of the sensing electrodes and a method of sensing a user touch the display panel
Data Source
AI summary
A touch display device including sensing electrodes arranged on a single layer of a touch panel and a touch detection circuit configured to determine whether an object touched the touch panel by a voltage detected by the sensing electrodes. The sensing electrodes include a first group including two first sensing electrodes spaced apart by having a second sensing electrode interposed between the two first sensing electrodes. The first group is connected to the touch detection circuit through one wire. The sensing electrodes also include a second group including one second sensing electrode. The second group is connected to the touch detection circuit through one wire.