Touch Panel Hand-Held Interference Suppression
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Solution Overview
Problem
Capacitive touch panels face issues with erroneous operations when a hand is held, as the panel responds to the hand's proximity, leading to interference and decreased operability.
Innovation Solution
A touch panel configuration with a first sensor panel, a second sensor panel, and a third sensor panel, where the third sensor panel overlaps with the second sensor panel and receives a transmission signal, allowing for the detection of hand grasping without false triggers, and includes a variable resistor to adjust sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a capacitive sensing touch panel is used to enable hovering operation, then fingerprint adhesion is avoided and operability is improved, but the panel responds to the approaching hand when the device is held, causing erroneous detection
Solution Approach 1:
The sensor panel is divided into multiple sensor regions that are independently controllable. The control unit selectively activates or deactivates specific sensor regions based on device state (held vs. operated), preventing erroneous detection while maintaining hovering operation capability in active regions.
Solution Approach 2:
The touch panel system dynamically adjusts its sensitivity and operational state based on real-time conditions. The control unit monitors device state and dynamically switches between different operational modes (hovering detection vs. held state suppression) to prevent erroneous detection while maintaining usability.
2Adaptability or versatility
If the touch panel detects hand approaching for hovering operation, then contactless operation is enabled, but false triggers occur when the device is simply held by the hand
Solution Approach 1:
The control unit acts as an intermediary between the sensor panel and the operation execution. It processes sensor signals, determines device state (held vs. operated), and selectively enables or disables hovering operation based on this determination, preventing false triggers while maintaining contactless operation capability.
Solution Approach 2:
The system applies preliminary suppression to sensor regions that are likely to cause false triggers when the device is held. By pre-deactivating or reducing sensitivity in these regions before erroneous detection occurs, the system prevents false triggers while maintaining hovering operation in appropriate areas.
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 suppresses the influence of a hand-held situation, improving operability by reducing false triggers and enhancing user interaction with the device.
Implementation Method 1
When the driving pulse is applied, an electric field is generated. When a hand enters this electric field, the number of lines of electric force between the transmission electrode 101 and the receiving electrode 102 decreases. The change in the number of lines of electric force appears as a change in the electric charge on the receiving electrode 102.
Data Source
AI summary
A touch panel includes a first sensor panel including at least one receiving electrode, a second sensor panel including at least one transmission electrode, and overlaid on the first sensor panel, and a third sensor panel including a predetermined electrode at least a part of which overlaps with the one transmission electrode, and overlaid on the second sensor panel. A transmission signal identical to that for the one transmission electrode can be applied on the predetermined electrode.