Concurrent Touch and Negative Pixel Scan Compensation
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Solution Overview
Problem
Touch sensitive devices face erroneous and distorted data outputs due to poorly grounded objects and simultaneous touch or hover events, which existing technologies struggle to address efficiently.
Innovation Solution
Concurrent scanning of touch panels that sense objects and negative pixel effects based on grounding conditions, allowing for simultaneous capture of sense signals and coupling signals to compensate for distortions, thereby improving processing efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If touch and negative pixel scans are performed sequentially, then the scanning process is simpler to implement, but processing time and power consumption increase
Solution Approach 1:
The patent combines the touch scan and negative pixel scan into a single concurrent scanning operation. The controller simultaneously performs both scanning functions by integrating the scan circuits and sharing common signal lines, allowing both touch detection and negative pixel effect detection to occur in parallel during the same scan period, thereby reducing total processing time and power consumption
2Use of energy by moving object
If touch and negative pixel scans are performed sequentially, then the circuit design is less complex, but power consumption increases
Solution Approach 1:
The patent merges the touch scan circuit and negative pixel scan circuit into a unified scanning system. Both scanning operations share common control signals, scan lines, and processing resources, allowing simultaneous execution that reduces overall power consumption compared to sequential operation while maintaining manageable circuit complexity through resource sharing
Solution Approach 2:
The scanning circuit is designed with multi-functionality to perform both touch detection and negative pixel effect detection. The same scan controller and signal lines are used for both purposes, making the circuit universally applicable to multiple functions and reducing the need for separate dedicated circuits, thereby lowering power consumption without significantly increasing design complexity
3Measurement precision
If conventional scanning is used, then the system is easier to operate, but touch sensing accuracy deteriorates due to negative pixel effects
Solution Approach 1:
The patent implements a feedback mechanism where the negative pixel scan results are used to compensate for errors in the touch scan signals. The controller detects negative pixel effects during the concurrent scan and applies correction algorithms to adjust the touch sensing data, thereby improving measurement precision while maintaining ease of operation through automated compensation
4Reliability
If poorly grounded objects are detected using conventional methods, then the detection process is simpler, but data output accuracy deteriorates due to erroneous readings
Solution Approach 1:
The patent uses feedback from the negative pixel scan to identify and correct erroneous readings caused by poorly grounded objects. By simultaneously monitoring both touch signals and negative pixel effects, the system can distinguish between genuine touch events and artifacts from poor grounding, applying corrections to improve data output reliability
Solution Approach 2:
The negative pixel scan acts as an intermediary diagnostic tool that provides information about grounding conditions. This intermediate measurement allows the system to infer the quality of object grounding and apply appropriate compensation or filtering to the main touch detection signals, improving reliability without requiring direct complex grounding verification
Data Source
AI summary
A concurrent touch and negative pixel scan performed at a touch panel is disclosed. The concurrent scan can include sensing an object proximate to the touch panel and sensing a negative pixel effect, based the object's grounding condition, at the touch panel, at the same time. As a result, sense signals indicative of the proximity of the object and coupling signals indicative of the negative pixel effect's magnitude can be captured concurrently. Because the negative pixel effect can cause errors or distortions in the sense signals, the coupling signals can be used to compensate the sense signals for the negative pixel effect.