Sensor Driver Noise Compensation for Electronic Device Sensing
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Solution Overview
Problem
Current electronic devices with touch-based input methods face challenges in providing accurate and efficient sensing performance, particularly when used with active pens for fine touch inputs, due to noise interference and varying image data patterns.
Innovation Solution
An electronic device configuration that includes a display layer, a sensor layer, and a sensor driver, where the sensor driver processes image information data based on noise calculations from multiple regions, adjusting output signals to improve sensing accuracy and reduce noise interference, allowing for both active pen and touch input modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor driver uses conventional sensing methods without noise compensation, then the device complexity is low, but the sensing precision deteriorates due to noise interference from display updates
Solution Approach 1:
The patent applies preliminary action by calculating noise information from display image data before the sensing operation occurs. The sensor driver receives image data, calculates noise metrics (such as standard deviation of gray levels) in advance, and uses this pre-calculated noise information to compensate for interference during sensing. This allows the system to predict and prepare for noise conditions without adding complex real-time processing during the actual sensing operation.
Solution Approach 2:
The patent introduces an intermediary mechanism by using noise information derived from display image data as a mediator between the display system and the sensing system. This noise information acts as a bridge that allows the sensor driver to understand and compensate for display-induced interference without requiring direct complex interaction between the display and sensing subsystems. The intermediary noise metric enables coordinated operation while maintaining relative system independence.
2Measurement precision
If the sensor driver adjusts output signals based on noise information from multiple regions, then the sensing accuracy improves, but the processing time and computational load increase
Solution Approach 1:
The patent applies segmentation by dividing the display screen into multiple regions and calculating noise information independently for each region. The sensor driver receives image data segmented by region, calculates regional noise metrics (such as average gray levels and standard deviations per region), and uses these segmented noise values to adjust sensing operations. This segmentation allows parallel processing of different regions and reduces the computational complexity compared to analyzing the entire screen as a single unit.
3Reliability
If the system optimizes sensing for active pen inputs with noise compensation, then the sensing performance improves, but the power consumption increases due to additional processing
Solution Approach 1:
The patent applies self-service by having the sensor driver autonomously calculate noise information from received image data and automatically adjust its output signals based on this calculated noise information. The system serves itself by using readily available display image data (which already exists for the display function) to generate noise compensation without requiring additional external input or complex coordinated control. This self-service approach minimizes additional power consumption while improving sensing performance.
Data Source
AI summary
An electronic device in some embodiments includes: a display layer configured to display an image based on image data and having a plurality of regions defined thereon; a sensor layer on the display layer; and a sensor driver configured to receive image information data calculated based on the image data, to generate an output signal based on the image information data, and to provide the output signal to the sensor layer, wherein the image information data includes noise information on the image, the noise information being calculated based on the plurality of regions. Some embodiments may include the electronic device included in an interface device.