Touch Controller Noise Reduction Circuitry
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Solution Overview
Problem
Touch sensitive devices face challenges in effectively reducing noise interference that compromises the recognition and interpretation of touch and hover events, affecting the accuracy and efficiency of operations.
Innovation Solution
Incorporating noise reduction circuitry in the transmit and receive sections of the touch controller to isolate and subtract noise from stimulation and touch signals, respectively, thereby improving the clarity and accuracy of touch and hover sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If noise reduction circuitry is added to the touch controller, then touch sensing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent introduces noise reduction circuitry as an intermediary component between the stimulation signal generation and touch signal processing. This circuitry includes noise filtering stages that act as mediators to separate and eliminate noise components from the touch signals, thereby improving measurement precision without requiring fundamental changes to the core touch sensing architecture
Solution Approach 2:
The noise reduction circuitry extracts and removes noise components from the touch signals through filtering operations. By taking out the harmful noise elements from the signal path, the system achieves better touch sensing accuracy while maintaining the overall structure of the touch controller
2Object-affected harmful factors
If noise reduction circuitry is implemented in both transmit and receive sections, then noise interference is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent divides the noise reduction functionality into separate segments: transmit section noise reduction and receive section noise reduction. This segmentation allows for modular implementation where each section can be optimized independently, facilitating easier manufacturing and assembly while achieving comprehensive noise interference reduction across the entire touch controller system
Data Source
AI summary
A touch controller having noise reduction circuitry is disclosed. The touch controller can include a transmit section for generating stimulation signals to drive a touch display to sense a touch or hover event. The touch controller can also include a receive section for processing touch signals from the touch display indicative of the touch or hover event. The touch controller can reduce noise introduced into the stimulation signals and propagated through the touch display into the touch signals, thereby interfering with touch and hover sensing. To reduce the noise, the transmit section's noise reduction circuitry can isolate and subtract some or all of the noise from the stimulation signals. In addition or alternatively, the receive section's noise reduction circuitry can isolate and subtract some or all of the noise from the touch signals.