Touch Controller Noise Reduction via Driving Signal Level Transitions
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Solution Overview
Problem
Noise coupling between display and touch panels in panel modules reduces the accuracy of touch sensing outputs, leading to additional costs and delayed operations due to the need for software/hardware revisions.
Innovation Solution
A control apparatus comprising a display driver and a touch controller that refers to the level transitions of driving signals to generate touch control signals, allowing the touch panel to operate in a less-noise environment by setting processing periods and using weighting schemes to minimize interference from display panel signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the display panel operates with driving signals, then display operations are enabled, but noise coupling occurs that reduces touch sensing accuracy
Solution Approach 1:
The patent segments the sensing operation timing into specific time windows that avoid the periods when display driving signals are active. The touch controller performs sensing operations during time slots that are separated from the display driving signal periods, thereby reducing noise coupling and improving touch sensing accuracy while maintaining display functionality.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the touch controller with knowledge of the display driving signal timing characteristics. The touch controller refers to the level transitions of driving signals to determine optimal sensing timing, allowing it to proactively schedule sensing operations during low-noise periods before noise interference occurs.
2Measurement precision
If software/hardware processes revise inaccurate touch sensing outputs, then sensing accuracy is improved, but additional costs and operation delays occur
Solution Approach 1:
The patent prevents the generation of inaccurate touch sensing outputs through preliminary timing coordination between display and touch operations. By scheduling touch sensing during periods when display driving signals are not causing noise interference, the system avoids generating inaccurate data that would require subsequent revision, thereby eliminating the time loss and additional processing costs associated with correction operations.
Data Source
AI summary
A control apparatus for controlling a panel module including a touch panel and a display panel is provided. The control apparatus includes: a display driver, coupled to the display panel, for controlling display operations of the display panel according to a plurality of driving signals; and a touch controller, coupled to the touch panel and the display driver, for referring to a level transition of at least one driving signal of the driving signals to generate a touch control signal corresponding to a touch sensing output generated by the touch panel.