Touch Sensing Substrate With Shared Signal Wires
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Solution Overview
Problem
Current touch sensing technologies, particularly self-capacitance detection techniques, face challenges due to the need for numerous signal wires, which increases space requirements and complicates the layout, leading to dead zones and difficulties in integrating touch and display components effectively, especially in narrow-boarder display panels.
Innovation Solution
A touch sensing substrate design that incorporates thin film transistor switch sets, reduced touch sensing signal wires, and a touch control circuit, allowing for a more efficient layout and reduced wire count, suitable for flexible printed circuits and display substrates, with thin film transistors and pixel electrodes arranged to minimize space and enhance touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a plurality of signal wires are used for each transparent sensing electrode in self-capacitance detection, then each electrode can be individually sensed, but the space requirement increases and dead zones are generated
Solution Approach 1:
The patent merges the functions of multiple signal wires by using a single shared signal wire that sequentially connects to multiple touch sensing electrodes through thin film transistor switches. This combining approach reduces the total number of signal wires from multiple dedicated wires to a single shared wire, thereby reducing space requirements and eliminating dead zones while maintaining individual electrode sensing capability through time-division multiplexing
Solution Approach 2:
The patent introduces dynamic control through thin film transistor switches that enable sequential connection and disconnection of touch sensing electrodes to the shared signal wire. This dynamic switching allows the system to adaptively allocate the shared signal wire to different electrodes at different time periods, achieving both space reduction and precise individual electrode measurement through time-division multiplexing
2Adaptability or versatility
If the number of display gate lines and display data lines is increased to accommodate more touch sensing electrodes, then touch sensing capability is improved, but wire layout becomes increasingly difficult
Solution Approach 1:
The patent makes the signal wire universal by designing it to serve multiple functions: it sequentially acts as the signal wire for each touch sensing electrode through time-division multiplexing controlled by thin film transistor switches. This multi-functional design allows a single wire to replace multiple dedicated wires, significantly reducing wire layout complexity while maintaining full touch sensing capability across all electrodes
Solution Approach 2:
The patent segments the touch sensing measurement process into discrete time periods, with each period dedicated to measuring a specific electrode. This temporal segmentation, controlled by thin film transistor switches, allows the shared signal wire to systematically serve multiple electrodes without interference, reducing spatial complexity while preserving comprehensive touch sensing capability
Data Source
AI summary
A touch sensing substrate includes a substrate, plural thin film transistor switch sets, plural touch sensing electrodes, plural touch sensing signal wires, plural touch sensing control wires, plural display drive thin film transistors, and plural pixel electrodes. Each thin film transistor switch set is arranged on one side of a substrate. Each touch sensing electrode corresponds to a thin film transistor switch set connected to the touch sensing electrode corresponding thereto. Each touch sensing signal wire is connected to at least two thin film transistor switch sets. Each touch sensing control wire is connected to the thin film transistor switch sets corresponding to at least two touch sensing electrodes. By the touch sensing control wires, the touch sensing signal wires, and the corresponding thin film transistor switch sets, a touch sensing signal from the touch sensing electrodes can be applied to a touch control circuit with less signal wires.