Touch Controller Full-Screen Detection for False Trigger Prevention
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Solution Overview
Problem
Conventional touch screens using mutual capacitive sensors often misjudge touches due to conductive substances like water stains, which can cause false readings by altering capacitive coupling between conductive strips, leading to inaccurate detection of external objects.
Innovation Solution
Implementing a full screen driven detection method that simultaneously provides a driving signal to all conductive strips, allowing for accurate determination of external object touches or approaches regardless of water stains, and updating reference values based on 2D sensing information when no external object is detected over a predetermined period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mutual capacitive detection is performed sequentially on each conductive strip, then detection coverage is complete, but detection time and power consumption increase
Solution Approach 1:
The patent merges the detection of all conductive strips into a single simultaneous operation. By applying a driving signal to all conductive strips at once and detecting their responses collectively, the system achieves complete detection coverage without the sequential time penalty, thus resolving the contradiction between detection completeness and detection time.
Solution Approach 2:
The patent performs preliminary full-screen detection to identify regions of interest before conducting detailed sequential detection. This preliminary action filters out areas without external objects, allowing the system to skip unnecessary sequential detection steps in those regions, thereby reducing overall detection time while maintaining accuracy.
2Measurement precision
If conventional mutual capacitive detection is performed sequentially on each conductive strip, then detection coverage is complete, but power consumption increases
Solution Approach 1:
The patent combines power consumption reduction with the time-saving full-screen detection method. By detecting all conductive strips simultaneously and identifying inactive regions, the system avoids unnecessary power expenditure on sequential detection of areas without external objects, thus reducing overall power consumption while maintaining detection accuracy.
Solution Approach 2:
The patent applies partial detection strategy by performing full-screen detection only when necessary (e.g., when external objects are detected in previous screens), and using simplified detection methods for routine monitoring. This selective application of detection intensity reduces power consumption while maintaining adequate detection accuracy.
3Measurement precision
If reference values are updated frequently, then detection accuracy is maintained, but power consumption and processing load increase
Solution Approach 1:
The patent implements periodic reference value updates based on detection results rather than continuous updates. Reference values are updated only when full-screen detection confirms no external objects are present on the screen, creating a periodic update cycle that maintains accuracy while minimizing power consumption and processing load during normal operation.
4Productivity
If full screen driven detection is performed, then detection speed increases, but the system may be triggered by conductive substances not coupled to ground
Solution Approach 1:
The patent uses feedback from full-screen detection results to control subsequent sequential detection. When full-screen detection identifies potential touches, the system triggers detailed sequential detection to verify and locate the external objects. This feedback mechanism ensures that fast full-screen detection does not produce false triggers, as unverified signals are not acted upon.
Solution Approach 2:
The patent introduces an intermediary verification step between full-screen detection and final touch determination. The sequential detection of individual conductive strips acts as an intermediary that validates signals from full-screen detection, filtering out false triggers from uncoupled conductive substances while maintaining the speed benefits of full-screen detection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces misjudgments and conserves time and power, enabling more efficient and accurate detection of external objects and preventing false triggers from conductive substances not coupled to ground.
Implementation Method 1
capacitive coupling signals at the intersections between the first conductive strip provided with the driving signal and all the second conductive strips
Data Source
AI summary
The invention discloses a touch controller, a touch system, and a method for detecting a touch screen. At first, a full screen driven detection is performed on a touch screen to determine whether at least one external object touches or approaches the touch screen. Then, if the full screen driven detection represents that no external object touches or approaches the touch screen, an updating determination is performed to determine whether a plurality of reference values are updated during a predetermined updating period of time. If the updating determination represents that the reference values are not updated during the predetermined updating period of time, the reference values will be updated based on a first 2D sensing information.