Rotary Touchscreen Input Electrode Layout for Flexible Placement
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Solution Overview
Problem
Existing input devices for touchscreen panels are limited in their placement on the front surface, as they can only be provided within a certain range where sensor electrodes are present, restricting their location and functionality.
Innovation Solution
An input device comprising a base member, an operating member, and fixed electrodes arranged to switch between conductive and non-conductive states, which can be placed at any location on the touchscreen panel, utilizing a magnetic attraction for fixation and a moving electrode to detect rotary operations through electrostatic capacitance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the input device uses a moving electrode that contacts fixed electrodes to detect rotary operations, then the detection function is achieved, but the device can only be provided within a certain range on the front surface of the touchscreen panel
Solution Approach 1:
The patent extracts the sensing function from the traditional capacitive touchscreen electrode structure. By removing the need for sensor electrodes to be present at the input device location, the device can be placed anywhere on the front surface. The moving electrode and fixed electrodes form a独立的检测系统 that operates independently of the touchscreen's sensor electrode layout.
Solution Approach 2:
The patent introduces a base member as an intermediary component between the operating member and the touchscreen panel. The base member provides a stable platform for mounting the electrode structure and positioning the operating member, enabling flexible placement while maintaining detection accuracy through its structural support and electrical isolation properties.
2Adaptability or versatility
If the input device is placed at any arbitrary location on the touchscreen panel, then placement flexibility is improved, but the detection accuracy may be compromised without proper electrode arrangement
Solution Approach 1:
The patent employs asymmetric arrangement of the fixed electrodes on the base member. The first and second fixed electrodes are positioned at specific locations that optimize the detection of rotary operations. This asymmetric configuration creates distinct electrostatic field patterns that enable accurate detection of rotation direction and magnitude, regardless of the input device's placement location on the touchscreen panel.
Solution Approach 2:
The patent utilizes changes in electrostatic capacitance as the operating member rotates. The moving electrode's position relative to the fixed electrodes changes, causing variations in electrostatic capacitance that are detected to determine rotary operation parameters. This parameter-based detection method maintains accuracy across different placement locations.
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 input device to be positioned at any arbitrary location on the touchscreen panel while effectively detecting rotary operations, enhancing flexibility and usability.
Implementation Method 1
As the operator turns the rotary operating knob, the moving electrode moves accordingly. This movement causes a variation in electrostatic capacitance produced between the fixed electrodes and the sensor electrodes.
Implementation Method 2
utilizing a magnetic attraction for fixation
Data Source
AI summary
An input device includes a contact board, a rotary click cam, and fixed electrodes. The contact board is placed on a front surface of a touchscreen panel. The rotary click cam is provided rotatably around a rotational axis with respect to the contact board. The fixed electrodes are arranged on a lower surface of the contact board. The fixed electrodes are configured to, as the rotary click cam is operated, be switched from an electrically conductive state into an electrically non-conductive state, or vice versa. The fixed electrode includes a first shifted portion shifted by a first predetermined distance with respect to the fixed electrode. The fixed electrode includes a second shifted portion shifted by a second predetermined distance with respect to the fixed electrode.