Foldable Sensor Panel Parasitic Capacitance Suppression
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Solution Overview
Problem
Portable information processing devices face challenges in durability due to accidental drops, leading to potential damage from applied forces, and existing display devices with high adhesiveness between layers are not sufficiently robust.
Innovation Solution
A novel input device design incorporating a sensor panel with foldable structure, including control and signal lines supported by a flexible base, which senses its folded state and suppresses parasitic capacitance, allowing for reliable and convenient operation even when folded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sensor panel is made foldable to enhance portability and convenience, then ease of operation is improved, but parasitic capacitance increases due to overlapping signal lines in the folded state
Solution Approach 1:
The patent applies equipotentiality by configuring overlapping signal line portions to have substantially equal potentials. Specifically, when the sensor panel is folded, signal lines that overlap are designed to carry signals at the same potential level, which eliminates potential differences between overlapping conductors and thereby suppresses parasitic capacitance effects. This allows the panel to be foldable without suffering from capacitance interference.
2Ease of operation
If the sensor panel is folded to improve portability, then ease of operation is improved, but sensing precision deteriorates due to capacitance changes
Solution Approach 1:
By making overlapping signal line portions equipotential through proper signal routing and potential equalization, the patent eliminates the primary source of capacitance variation during folding. This maintains stable electrical characteristics and ensures consistent sensing precision whether the panel is folded or unfolded.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting signal transmission parameters based on the panel's folding state. The system detects whether the panel is folded or unfolded and modifies signal characteristics accordingly, allowing the sensing system to maintain precision across different physical configurations.
3Device complexity
If signal lines are placed to overlap in the folded state to maintain routing efficiency, then device complexity is reduced, but parasitic capacitance increases
Solution Approach 1:
The patent resolves this contradiction by making the overlapping signal line portions equipotential. This allows the signal lines to overlap in the folded state without generating harmful capacitance, as equal potentials eliminate the capacitive coupling effect. The routing can therefore be simplified while avoiding parasitic capacitance issues.
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 input device provides a reliable and convenient user experience by effectively managing capacitance and sensing information, including positional data, when the sensor panel is folded or unfolded, enhancing durability and usability.
Implementation Method 1
a capacitor including a first electrode and a second electrode, in which a first signal line and a folded signal line are respectively connected to the first electrode and the second electrode
Implementation Method 2
When a voltage is applied between the first signal line and the folded signal line, a capacitor is formed
Data Source
AI summary
A novel input device that is highly convenient or reliable is provided. Alternatively, a novel input device is provided. The input device includes a sensor panel that can be folded, a housing that enables the sensor panel to be folded, and a sensing portion that senses the folded state of the sensor panel and supplies folding information. Furthermore, the sensor panel includes a signal line extending in the column direction, and a part of one signal line is placed to face another part of the signal line in the folded state.