Touch Panel Capacitance Control for Magnetic-Immune Display Wake
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Solution Overview
Problem
Hall effect sensors used to control display on/off based on shielding cover status fail in strong magnetic fields, leading to incorrect screen control.
Innovation Solution
Use capacitance detection on a touch panel to determine contact regions and conditions to control display on/off, independent of magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Hall effect sensor is used to detect shielding cover status, then the display control function is achieved, but the system becomes unreliable in strong magnetic field environments
Solution Approach 1:
The patent replaces the Hall effect sensor (magnetic field detection) with a capacitance detection system on the touch panel. The touch panel detects changes in capacitance caused by the shielding cover's proximity or contact, eliminating reliance on magnetic field sensors that are susceptible to external magnetic interference. This substitution resolves the contradiction by using a different detection mechanism that is immune to magnetic field effects.
2Loss of energy
If the display is controlled to turn off upon closing the shielding cover, then energy consumption is reduced, but incorrect control may occur due to magnetic field interference
Solution Approach 1:
The patent uses capacitance detection on the touch panel to accurately determine when the shielding cover is closed, replacing the unreliable Hall effect sensor. This ensures the display is turned off only when the cover is actually closed, preventing incorrect power states caused by magnetic field interference while maintaining energy savings.
Solution Approach 2:
The system continuously monitors capacitance changes on the touch panel and uses this feedback to determine the shielding cover status. The capacitance detection provides real-time information about the cover state, enabling accurate and reliable display control that responds correctly to actual cover position without being affected by magnetic field variations.
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
Accurately controls display on/off based on contact with a shielding cover, reducing energy consumption and avoiding incorrect control due to magnetic interference.
Implementation Method 1
obtaining capacitance values of a detection region of the touch panel, where a location point at which a difference between a capacitance value in the detection region and a first value exceeds a first preset threshold is a contact region
Data Source
AI summary
A display control method comprises obtaining capacitance values of a detection region of a touch panel, where a location point at which a difference between a capacitance value in the detection region and a first value exceeds a first preset threshold is a contact region, and a location point at which a difference between a capacitance value in the detection region and the first value does not exceed the first preset threshold is a contactless region. When the contact region meets a first predetermined condition or the contactless region meets a second predetermined condition, controlling the display to turn off. When the contactless region does not meet the second predetermined condition or the contact region does not meet the first predetermined condition, controlling the display to turn on. The whole process is not easily to be interfered with by external magnetic fields.