Sensor Device Time-Division Sensing for Noise Reduction
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Solution Overview
Problem
Existing sensor devices face challenges in reducing noise without altering the magnitude or frequency band of driving signals, which affects both display quality and sensing sensitivity.
Innovation Solution
A sensor device with a sensor unit comprising multiple first and second sensor electrodes forming capacitors at intersections, and a sensor driver that time-divisionally senses multiple sensing areas with different probabilities during alternating sensing frame periods, ensuring that the initial and last sensing areas are sensed in different orders between frame periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the frequency band of the driving signal is changed to avoid EMI, then electromagnetic interference is reduced, but an additional appropriate frequency band is difficult to find
Solution Approach 1:
The patent applies parameter changes by modifying the timing parameters of signal transmission rather than changing the frequency band. Specifically, it alternates the transmission timing of sensor driving signals between different frame periods, allowing the same frequency band to be used while avoiding electromagnetic interference through temporal separation.
2Object-affected harmful factors
If the magnitude of the driving signal is reduced to avoid EMI, then electromagnetic interference is reduced, but the signal to noise ratio is reduced
Solution Approach 1:
The patent applies periodic action by transmitting sensor driving signals in alternating frame periods rather than continuously. During odd frame periods, signals are transmitted to first sensor electrodes, and during even frame periods, signals are transmitted to second sensor electrodes. This periodic transmission reduces electromagnetic interference while maintaining full signal magnitude, thus preserving signal-to-noise ratio.
3Reliability
If driving signals are transmitted to sensor electrodes, then sensing function is enabled, but noise is generated affecting display quality
Solution Approach 1:
The patent applies segmentation by dividing the sensor electrodes into two groups: first sensor electrodes (transmitted signals) and second sensor electrodes (received signals). By segmenting the sensing function across different electrode groups and alternating their activation in different frame periods, the patent enables the sensing function while reducing noise generation through temporal separation.
4Reliability
If display signals are transmitted to display electrodes, then image display is enabled, but noise is generated affecting sensing sensitivity
Solution Approach 1:
The patent applies periodic action by coordinating the transmission of display signals and sensor driving signals in alternating frame periods. Display signals are transmitted during periods when sensor driving signals are not active, and vice versa. This periodic separation enables both display and sensing functions while preventing mutual noise interference that would degrade sensing sensitivity.
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 effectively reduces noise in sensor devices without changing the driving signal's magnitude or frequency band, thereby enhancing both display quality and sensing sensitivity.
Implementation Method 1
a sensor unit (120) including a plurality of first sensor electrodes (TX1 to TXq) and a plurality of second sensor electrodes (RX1 to RXp, RXq to RX1), the plurality of first and second sensor electrodes configured to form a plurality of capacitors at a plurality of intersections of the plurality of first and second sensor electrodes
Data Source
AI summary
A sensor device includes sensing areas, first sensor electrodes and second sensor electrodes forming capacitors at intersections of the first and second sensor electrodes, and a sensor driver time-divisionally senses each of the sensing areas once during a first sensing frame period, time-divisionally senses each of the sensing areas once during a second sensing frame period, and sets an initial sensing area to be sensed during an initial second sensing period of the second sensing frame period to be different from a last sensing area sensed during a last first sensing period of the first sensing frame period.