Dual-Surface Touch Detection via Dynamic Sensor Mode Switching
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Solution Overview
Problem
Existing portable terminals with touch sensors on both front and back surfaces face increased thickness and complex manufacturing processes, necessitating a solution for detecting touch operations on both surfaces without duplicating touch sensors.
Innovation Solution
An operation detection device with a panel that receives touch operations on both main surfaces, a pressing operation detection unit, an electrostatic capacitance sensor, and a control unit that determines the surface of the touch operation and switches the driving mode of the electrostatic capacitance sensor to maintain uniform sensitivity, eliminating the need for touch sensors on both surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch sensors are provided on both front and back surfaces, then touch operations on both surfaces can be detected, but device thickness increases and manufacturing process becomes complicated
Solution Approach 1:
A single electrostatic capacitance sensor performs the function of detecting touch operations on both the front and back surfaces by switching its driving mode based on which surface is being touched, eliminating the need for separate touch sensors on each surface
Solution Approach 2:
The electrostatic capacitance sensor dynamically switches between two driving modes (first driving mode for front surface detection, second driving mode for back surface detection) based on the detected pressing operation, allowing one sensor to adaptively serve multiple detection purposes
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
Enables the detection of touch operations on both front and back surfaces with uniform sensitivity without the need for touch sensors on both surfaces, reducing device thickness and simplifying manufacturing.
Implementation Method 1
an electrostatic capacitance sensor that detects the touch operation on the first main surface or the second main surface of the panel
Implementation Method 2
a piezoelectric film that is pressed in accordance with a pressing operation on the first main surface or the second main surface
Data Source
AI summary
An operation detection device that includes a panel that receives a touch operation from a first main surface or a second main surface; a pressing operation detection unit that detects a pressing operation on the first main surface or the second main surface of the panel; an electrostatic capacitance sensor that detects the touch operation on the first main surface or the second main surface of the panel; and a control unit that determines, according to a detection result of the pressing operation detection unit, which of the first main surface and the second main surface the pressing operation is performed and switches a driving mode of the electrostatic capacitance sensor.