Touch Panel Submersion Detection and Sensing Adjustment
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Solution Overview
Problem
Current display devices with capacitive touch panels cannot distinguish between user touches and water contact, leading to malfunctions and unnecessary power consumption when submerged, as they continue to perform touch sensing operations underwater without providing a usable interface for the user.
Innovation Solution
A display device and method that adjust the sensing periods and reference values of touch and force sensors based on whether the touch panel is submerged, allowing for accurate touch and force sensing only when necessary, thereby reducing power consumption and enabling user interaction underwater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitive touch panel continuously performs touch sensing operations, then the touch sensing function is always available, but the device cannot distinguish between user touches and water contact, causing malfunctions and unnecessary power consumption
Solution Approach 1:
The sensing period is made dynamic by adjusting it based on whether the device is in water. The controller increases the sensing period when water contact is detected, reducing the frequency of sensing operations and power consumption, while maintaining accurate touch detection capability when needed
Solution Approach 2:
The sensing reference value is changed as a parameter adjustment to differentiate water contact from user touches. By modifying the reference value used for comparison, the system can accurately distinguish between the two types of contact events and avoid false triggering
2Loss of energy
If the sensing period is increased to reduce power consumption, then power efficiency improves, but the response time to user touches may be delayed
Solution Approach 1:
The sensing period is dynamically adjusted based on operational context. When water contact is detected, the sensing period is increased to reduce power consumption. When water contact is not present, the sensing period returns to normal, ensuring fast touch response. This dynamic adjustment resolves the contradiction between power efficiency and response speed
3Measurement precision
If the sensing reference value is changed to differentiate water contact from user touches, then touch sensing accuracy improves, but the complexity of the sensing algorithm increases
Solution Approach 1:
The sensing reference value is adjusted as a controllable parameter to improve touch detection accuracy. By changing this reference parameter, the system can distinguish between water contact and user touches without requiring complex algorithms, thus maintaining relatively simple control logic while achieving precise measurement
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
The solution effectively prevents unnecessary power consumption and allows for intended user interactions even when the touch panel is submerged, by increasing sensing periods and changing reference values to differentiate between water contact and user input, thus enhancing user convenience and device reliability.
Implementation Method 1
a force sensor configured to sense a force signal
Implementation Method 2
a capacitive touch panel, which senses a capacitance variation according to a user's touch
Data Source
AI summary
A method of driving a display device includes: sensing a touch signal from a plurality of touch electrodes in a touch panel, sensing a force signal from a force sensor, based on the sensed touch signal, determining whether or not the touch panel is in a submerged state, when the touch panel is determined to be in the submerged state, increasing sensing periods of the touch signal and the force signal, detecting a baseline variation of the force sensor, based on the detected baseline variation, changing a sensing reference value of the force sensor, based on the increasing the sensing periods, sensing the force signal equal to or greater to the changed sensing reference value through the force sensor, and when the force signal equal to or greater to the changed sensing reference value is sensed through the force sensor, decreasing the sensing periods.