Dual-Differential Sensing for Flexible Touch Displays
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Solution Overview
Problem
Touch displays face interference from noise emitted by the display surface, leading to erroneous judgments in sensing external objects, and existing solutions like rare shielding layers incur additional costs and design complexities.
Innovation Solution
A dual-differential sensing method and device that uses a plurality of sensors to generate sensing information, where each value corresponds to signals from three sensors, minimizing noise interference by accounting for the distance between the sensors and the display, and reducing noise effects through differential signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a rare shielding layer is added between the display and sensing device to shield noise, then noise interference is reduced, but manufacturing cost and design complexity increase
Solution Approach 1:
The patent extracts and removes the rare shielding layer from the system, instead using a different approach: it takes out the harmful noise component through differential signal processing by comparing signals from multiple sensors, thereby eliminating the need for the shielding layer while maintaining noise rejection
Solution Approach 2:
The patent replaces the mechanical/physical shielding layer with an electrical/signal processing approach. Instead of using a physical barrier (shielding layer) to block noise, the system uses differential signal processing algorithms to electronically cancel out common-mode noise, substituting a mechanical solution with an electrical one
2Object-affected harmful factors
If a rare shielding layer is added between the display and sensing device to shield noise, then noise interference is reduced, but design complexity increases
Solution Approach 1:
The patent extracts and removes the rare shielding layer from the system, instead using a different approach: it takes out the harmful noise component through differential signal processing by comparing signals from multiple sensors, thereby eliminating the need for the shielding layer while maintaining noise rejection
Solution Approach 2:
The sensing system performs self-service by using its own multiple sensors to detect and cancel noise. The differential processing uses the signals from multiple sensors themselves to identify and eliminate common-mode noise, making the system self-correcting without requiring external shielding components
3Device complexity
If traditional single-sensor sensing is used, then device simplicity is maintained, but noise interference causes erroneous judgments
Solution Approach 1:
The patent segments the sensing function by using multiple sensors instead of a single sensor. Each sensor provides an independent measurement, and the differential processing combines these segmented measurements to cancel noise, thereby improving reliability while maintaining reasonable system complexity
Solution Approach 2:
The patent merges the outputs of multiple sensors through differential signal processing. By combining the signals from multiple sensors and processing them differentially, the system achieves noise cancellation and improved sensing accuracy, merging individual sensor contributions into a more reliable overall measurement
Data Source
AI summary
A method and device for dual-differential sensing is disclosed. The sensing information can be generated from signals provided by a sensing device with a plurality of sensors. Each value of the sensing information corresponds to signals of three sensors, respectively. The sensing device is flexible and configured on a display. The noise effect of the display on the signal of each sensor corresponds to the distance between the display and the sensor. Besides, the noise effect of the display on each value of the sensing information corresponds to the distances between the display and the three sensors, respectively.