Multi-Frequency Touch Sensor Driving for High Report Rates
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Solution Overview
Problem
As display devices increase in size, the number of sensing electrodes required for touch input detection also increases, leading to a decrease in sensing time and touch report rate, necessitating a sensor unit with a high touch report rate to keep pace with higher display frequencies.
Innovation Solution
A touch sensor device and driving method that simultaneously supply driving signals to all row or column electrodes, using multiple frequency signals with inverted waveforms and phases to enhance sensing efficiency, allowing for simultaneous reception of sensing signals from second sensors, thereby achieving a high touch report rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of sensing electrodes is increased to cover larger display areas, then the sensing coverage is improved, but the sensing time allocated to each channel decreases
Solution Approach 1:
The sensing electrodes are divided into multiple groups (first group and second group), each driven by different frequency signals. This segmentation allows parallel processing of multiple sensing channels simultaneously, increasing the effective sensing time available for each channel while maintaining comprehensive coverage.
Solution Approach 2:
Different frequency signals are applied to different groups of sensing electrodes in a periodic manner. The first frequency signal drives the first group while the second frequency signal drives the second group, creating time-multiplexed periodic action that increases overall sensing throughput without reducing individual channel sensing time.
2Reliability
If the display frequency is increased to display smooth images, then the image quality is improved, but the touch report rate requirement increases
Solution Approach 1:
By segmenting the sensing electrodes into multiple groups driven by different frequencies, the system can process multiple sensing channels in parallel, thereby increasing the touch report rate to match higher display frequencies without compromising image quality.
Solution Approach 2:
The system changes the frequency parameter of driving signals to match different display frequencies. By using multiple frequency signals simultaneously, the sensing system can operate at higher frequencies required for smooth image display while maintaining adequate touch detection capability.
3Productivity
If multiple frequency signals are used to drive different sensor groups, then the touch report rate is improved, but the signal processing complexity increases
Solution Approach 1:
The use of periodic frequency signals with distinct frequencies allows for straightforward signal separation through frequency-domain processing. The periodic nature of the signals enables simple correlation-based demodulation techniques that reduce processing complexity compared to aperiodic or coded signaling approaches.
Solution Approach 2:
By changing the frequency parameter to be distinct for different sensor groups, the system enables simple frequency-based signal separation. This parameter differentiation allows receivers to isolate and process signals from different groups independently using basic frequency filtering, minimizing processing complexity.
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 enables a higher touch report rate, improving the sensing efficiency and responsiveness of touch input detection, even with larger display devices, by efficiently utilizing multiple frequency signals and electrode configurations.
Implementation Method 1
a multi-frequency generator generating a first frequency signal and a second frequency signal having different frequencies
Implementation Method 2
second sensors forming capacitance with the first sensors
Implementation Method 3
a sensor receiver simultaneously receiving sensing signals from the second sensors
Data Source
AI summary
A sensor device of the present invention includes first sensors; second sensors forming capacitance with the first sensors; a multi-frequency generator generating a first frequency signal and a second frequency signal having different frequencies; a sensor transmitter supplying first driving signals based on the first frequency signal to first sensors of a first group among the first sensors, supplying second driving signals based on the second frequency signal to first sensors of a second group among the first sensors, and simultaneously supplying the first driving signals and the second driving signals; and a sensor receiver simultaneously receiving sensing signals from the second sensors.