Sensor Driver Interference Reduction for Display Input Devices
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Solution Overview
Problem
Existing input devices face interference issues due to the coupling between display electrodes and sensor electrodes, which affects the accuracy of detecting user input, particularly in capacitive sensing technologies.
Innovation Solution
The implementation of a system where the sensor driver acquires data from sensor electrodes, receives display signals from the display driver, and adjusts the sensor data to reduce interference, utilizing methods such as capacitive coupling modeling and interference metric generation to differentiate between input signals and display-related interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensor electrodes are disposed over the display panel to enable capacitive sensing, then input detection capability is improved, but display interference increases affecting measurement precision
Solution Approach 1:
The patent introduces a sensor driver as an intermediary component that receives both sensor data from sensor electrodes and display signals from the display driver. This intermediary processes the sensor data by reducing interference based on the display signal, effectively mediating between the display system and sensing system to eliminate harmful interactions while preserving input detection capability
Solution Approach 2:
The sensor driver utilizes feedback from the display signal to dynamically adjust and reduce interference in the sensor data. By continuously monitoring the display signal and applying compensation based on this feedback, the system maintains high measurement precision despite the presence of display electrodes and their associated interference
2Device complexity
If display electrodes and sensor electrodes are coupled in the same device, then device integration is improved, but interference between electrodes increases
Solution Approach 1:
The sensor driver serves as a mediator that receives display signals and uses them to compensate for interference in sensor readings. This intermediary approach allows the integrated device structure to function effectively by actively managing and reducing the harmful electromagnetic coupling between display and sensor electrodes
Solution Approach 2:
The patent converts the harmful display signal interference into a beneficial compensation mechanism. By analyzing the display signal characteristics, the sensor driver generates correction factors that transform the previously harmful electromagnetic coupling into a predictable and compensable effect, thereby maintaining high sensing accuracy in the integrated device
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 the accuracy of user input detection by minimizing false detection of input signals, improving the performance of the sensing device by effectively reducing display-related interference.
Implementation Method 1
Existing input devices face interference issues due to the coupling between display electrodes and sensor electrodes
Data Source
AI summary
A system and method for mitigating interference within a sensing device. The sensing device may be part of an input device that also includes a display device. The display device may include a display panel having a plurality of display electrodes, and a display driver configured to drive the plurality of display electrodes. The sensing device may include a plurality of sensor electrodes disposed over the display panel, and a sensor driver communicatively coupled to the plurality of sensor electrodes and the display driver. The sensor driver may be configured to acquire sensor data from the plurality of sensor electrodes, receive a display signal from the display driver, and reduce interference within the sensor data at least partially based on the display signal.