Touch Screen Static Elimination via Sensor Triggered Reset
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Solution Overview
Problem
Capacitive touch screens are prone to malfunction due to static interference, leading to unresponsive touch information and I2C communication failures, resulting in non-functional touch screen phenomena.
Innovation Solution
A static eliminating method using a photo sensor or gravity sensor to detect communication failures and false touch events, triggering a reset operation by turning off and on the touch screen or resetting its register software when communication failures exceed set values or false reports occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch screen continuously reports touch information to the application layer, then the touch screen appears responsive, but static impact causes infinite reporting loops that prevent normal function
Solution Approach 1:
The patent implements a feedback mechanism where the system monitors touch event reporting patterns and compares them against predefined thresholds. When the number of touch events in a specific area exceeds the threshold within a set time period, the system identifies this as static impact and triggers a reset operation, thereby using feedback to distinguish between normal touch input and harmful static conditions
Solution Approach 2:
The patent performs preliminary actions by pre-establishing threshold values for touch event counting and pre-configuring reset operations. Before static impact occurs, the system is ready with predetermined criteria to detect and respond to static conditions, enabling proactive prevention rather than reactive response
2Reliability
If the touch screen resets frequently to recover from static impact, then normal functionality is restored, but system stability and reliability are reduced
Solution Approach 1:
The system uses feedback from monitoring communication between the touch screen and control chip, as well as touch event patterns, to determine when a reset is actually necessary. This prevents unnecessary resets while ensuring timely recovery when static impact occurs
Solution Approach 2:
The patent applies partial action by resetting only the specific register software or touch screen components that are affected by static impact, rather than performing a complete system reset. This selective approach restores functionality while minimizing disruption to the overall system state
3Adaptability or versatility
If the touch screen uses standard I2C communication protocol, then compatibility with control chips is ensured, but static impact causes communication failures that disable the touch screen
Solution Approach 1:
The system continuously monitors I2C communication status between the touch screen and control chip, using feedback signals to detect communication failures caused by static impact. When failures exceed a predetermined threshold, the system triggers a reset operation to restore communication functionality
Solution Approach 2:
The patent implements prior cushioning by establishing threshold values for communication failure detection and pre-configuring reset operations. This prepares the system in advance to handle communication failures gracefully, preventing complete system failure while maintaining compatibility with standard I2C protocols
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
Effectively resets the touch screen to recover normal functionality by accurately identifying static-induced failures and implementing corrective measures, preventing malfunctions and ensuring timely recovery.
Implementation Method 1
detecting if the touch screen departs from an object by using said photo sensor
Implementation Method 2
detecting if the touch screen of a hand-held device is switched from the state of facing down into the state of facing up by using a gravity sensor
Data Source
AI summary
The present invention relates to A static eliminating method for a touch screen comprising: detecting if the touch screen departs from an object by using said photo sensor, and counting the number of communication failures between the touch screen and a control chip or detecting if the touch screen of a hand-held device is switched from the state of facing down into the state of facing up by using a gravity sensor, counting the number of failures of communication between the touch screen and the control chip; executing the reset operation of turning off and then turning on if the number of failures exceeds a communication failure set value; or executing the reset operation of resetting the register software of the touch screen/turning off and then turning on touch screen if the number of failures is smaller than a communication failure set value and the number of touch events in the same area of the touch screen in a set time exceeds a false report set value.(executing the reset operation of resetting the register software of the touch screen in a preferable embodiment) By using this method, the touch screen can be quickly reset to recover normal service if the touch screen is affected by static.