Touch-Sensitive Display Dual-Electrode Capacitance Sensing
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Solution Overview
Problem
Existing touch-sensitive displays in portable electronic devices face challenges in efficiently detecting touches and gestures, particularly in low-power conditions, where traditional methods consume high power and are less effective.
Innovation Solution
The use of a touch-sensitive display with first electrodes for mutual-capacitance touch sensing and additional electrodes for self-capacitance touch sensing, allowing for detection of touches and gestures even when the display controller is off, reducing power consumption and enabling gesture direction determination without drive electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional touch detection methods are used continuously, then touch detection capability is maintained, but power consumption increases
Solution Approach 1:
The patent implements dynamic switching between mutual-capacitance and self-capacitance touch sensing modes based on power management requirements. The system can transition from continuous mutual-capacitance detection (higher power) to self-capacitance detection (lower power) when the display controller is off, maintaining touch detection capability while adapting power consumption to operational conditions
Solution Approach 2:
The patent changes the detection parameter by switching between two different capacitance sensing methods. Mutual-capacitance sensing uses drive electrodes and sense electrodes to detect touches, while self-capacitance sensing uses only sense electrodes. This parameter change allows the system to maintain touch detection functionality while reducing power consumption in low-power states
2Use of energy by moving object
If display controller is turned off to reduce power, then power consumption decreases, but touch detection capability is lost
Solution Approach 1:
The patent segments the touch detection function from the display controller operation. The sense electrodes remain functional even when the display controller is off, allowing self-capacitance touch detection to operate independently. This segmentation enables touch detection capability to be maintained in low-power modes where the display controller is not active
Solution Approach 2:
The sense electrodes perform dual functionality: they serve both the display controller during normal operation and the touch detection system during low-power modes. The electrodes themselves maintain their sensing capability without requiring active driving from the display controller, enabling self-service touch detection when power is reduced
3Measurement precision
If mutual-capacitance sensing is used exclusively, then gesture direction can be detected, but power consumption increases and complexity increases
Solution Approach 1:
The patent applies partial action by using self-capacitance sensing for basic touch detection when full gesture direction detection is not required. This partial approach reduces power consumption while still providing useful touch information. When full gesture direction detection is needed, the system can switch to mutual-capacitance sensing, providing flexible power consumption levels matched to actual detection needs
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 approach enhances touch and gesture detection capabilities while reducing power consumption, allowing for efficient operation in low-power conditions and improving user interaction without increasing power usage.
Implementation Method 1
detecting touches by mutual-capacitance touch sensing utilizing first electrodes and second electrodes of a touch-sensitive display
Implementation Method 2
detecting touches by self-capacitance touch sensing utilizing the second electrodes and third electrodes of the touch-sensitive display
Data Source
Figure 1
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AI summary
A touch-sensitive display includes first electrodes and second electrodes arranged and constructed to detect touches by mutual-capacitance touch sensing, and third electrodes and the second electrodes arranged and constructed to detect touches by self-capacitance touch sensing, wherein the first electrodes are different from the third electrodes.