Touch Sensing Circuit Dynamic Amplitude Control
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Solution Overview
Problem
Conventional touch sensing circuits do not effectively determine the presence of external objects, such as gloves, and lack bidirectional communication interfaces between touch control and power circuits, leading to reduced sensitivity and inefficient power usage.
Innovation Solution
A touch sensing circuit with a control interface between the touch control circuit and the touch power circuit, allowing for bidirectional communication and dynamic control of the driving signal amplitude, enhancing sensitivity and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high driving voltage is constantly transferred to enhance touch sensitivity, then the sensitivity is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic control of the driving voltage amplitude through a control interface between the touch control circuit and touch power circuit. The system adjusts the driving voltage based on detected touch conditions - using higher amplitudes when glove touch is detected to maintain sensitivity, and lower amplitudes during normal operation to reduce power consumption. This dynamic adjustment resolves the contradiction between maintaining high sensitivity and minimizing power usage.
Solution Approach 2:
The patent changes the amplitude parameter of the driving signal based on touch condition detection. When a glove touch is detected (indicated by specific capacitance change patterns), the system increases the driving voltage amplitude to enhance sensitivity. During normal touch conditions, the amplitude is reduced to optimize power consumption. This parameter change strategy allows the system to adapt to different operational requirements.
2Device complexity
If a conventional touch sensing circuit is used without bidirectional communication interface, then the device complexity is reduced, but the adaptability to different touch conditions deteriorates
Solution Approach 1:
The patent introduces a bidirectional control interface that enables feedback communication between the touch control circuit and touch power circuit. The touch control circuit detects touch conditions and sends control signals through the interface to adjust the driving voltage amplitude in real-time. This feedback mechanism allows the system to adapt to different touch conditions (glove touch, normal touch, interruption) while maintaining relatively simple circuit structures, resolving the contradiction between complexity and adaptability.
Solution Approach 2:
The control interface serves multiple functions: it transmits control signals for amplitude adjustment, enables bidirectional communication between circuits, and supports various touch condition detection modes. This multi-functional interface design provides high adaptability without proportionally increasing device complexity, as a single interface structure handles multiple control and communication tasks.
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 improves the signal-to-noise ratio and reduces power usage by dynamically adjusting the driving voltage based on the type of touch input, specifically enhancing glove touch sensitivity and optimizing power usage in display devices.
Implementation Method 1
The touch panel generates capacitance between the driving electrode and the sensing electrode, and a change in the capacitance may indicate the proximity or the touch of the external object
Data Source
AI summary
The present embodiment relates to a touch sensing circuit configured to control a driving signal transferred to a power circuit and, more specifically, to a touch sensing circuit and a method for operating a touch sensing circuit, the touch sensing circuit including: a readout circuit configured to output a driving signal for driving a touch electrode included in a panel; a power circuit configured to supply driving power to the readout circuit; and a touch control circuit communicating with the power circuit to control the amplitude of a driving signal.