Active Touch Sensing Circuit Signal Intensity
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Solution Overview
Problem
Conventional touch sensing circuits in touch panels face challenges with low signal intensity, high power consumption, and increased cost due to the need for an extra gate electrode and varying voltage responses, making them inefficient for large-area touch panels.
Innovation Solution
An active touch sensing circuit with a controllable gate voltage and a thin film transistor-based resistance and capacitance configuration, which generates a significant open current upon touch, enhancing signal intensity and reducing power consumption by eliminating current flow when untouched.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an extra gate electrode is added to control and drive scan lines, then the touch sensing circuit can function, but the device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts and eliminates the unnecessary gate electrode from the conventional touch sensing circuit structure. By removing this extra component, the patent achieves the same touch sensing function with a simplified circuit architecture, directly reducing device complexity and manufacturing cost while maintaining reliability
Solution Approach 2:
The patent makes the existing source electrode perform multiple functions: it serves as both the signal reading electrode and the control electrode that would traditionally require a separate gate electrode. This multi-functionality eliminates the need for the extra gate electrode, simplifying the overall circuit structure
2Measurement precision
If the voltage is used as the response signal, then the sensing mechanism works, but the response signal is weak and hard to read
Solution Approach 1:
The invention changes the response signal parameter from voltage to current. By utilizing the source electrode to read current instead of voltage, and by controlling the timing of the control signal to generate current pulses, the patent produces a stronger, more easily detectable signal that improves both measurement precision and ease of reading
3Power
If a large current is passed when the touch panel is not touched, then the circuit operates, but the power consumption is large
Solution Approach 1:
The patent implements periodic action by controlling the timing of the control signal applied to the source electrode. The control signal is applied only during specific time periods when touch detection is needed, rather than continuously. This timing control ensures that current flows only when necessary for sensing, dramatically reducing power consumption during non-touch periods while maintaining proper circuit operation
Solution Approach 2:
The circuit design allows the touch sensing function to activate the current flow automatically when needed. The control mechanism is integrated into the sensing operation itself, so current is passed only when the sensing circuit actively needs to detect touch input, eliminating wasteful continuous current flow
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
The solution increases the sensing signal intensity, reduces erroneous judgments, and lowers power consumption by generating a large open current only upon touch, making it suitable for large-area touch panels while reducing circuit costs.
Implementation Method 1
When the capacitance is touched, its capacitance value will be changed at the same time, so that a serious RC delay effect will be generated for the wave form of the gate electrode of transistor
Data Source
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AI summary
The invention discloses an active matrix touch sensing circuit apparatus (300) used in a touch panel comprising a sensing unit (310), a resistance (308), and a thin film transistor (302). The resistance connects the sensing unit (310) and the first scan line. The control end (3022) of the thin film transistor (302) connects the sensing unit (310), the second scan line connects the input end (3024) of the thin film transistor (302), and the read out line connects the output end (3026) of the thin film transistor (302). When the sensing value of the body touch sensing unit (310) is changed, then the input wave form of the control end (3026) is changed. The output end (3026) generates an open current, and the read out line transmits the open current.