Auxiliary Keypad for Touchscreen via Capacitive Pressing
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Solution Overview
Problem
Conventional keyboards for electronic devices require electric circuits and power sources, leading to increased thickness and cost, and wireless keyboards are limited by design and connectivity options, while also being bulky and expensive.
Innovation Solution
A C-type touch input method using a keypad with an array of key tops and a substrate that operates a touch screen by pressing operations, eliminating the need for electric connections and allowing the keyboard to be mounted on the device's surface or exterior cover for easy data input and carrying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a keyboard uses electric connection (Bluetooth, USB) to enable data input, then connectivity and input capability are improved, but thickness and cost increase due to required electric circuits and power sources
Solution Approach 1:
The patent replaces the electrical connection system (circuits, batteries, wireless modules) with a mechanical touch-based system. The keyboard overlay uses a flexible substrate with conductive traces that detect finger presses through capacitive coupling with the touchscreen, eliminating the need for power sources and complex electronics while maintaining data input functionality.
Solution Approach 2:
The invention extracts and removes the power source (battery) and complex electric circuit components from the keyboard system. By using the touchscreen's existing capacitive sensing capability and the flexible substrate's conductive traces, the design eliminates unnecessary components that increase thickness and cost.
2Adaptability or versatility
If a wireless keyboard includes Bluetooth circuit and battery, then wireless connectivity is achieved, but device complexity and price increase
Solution Approach 1:
The keyboard overlay serves multiple functions: it provides physical tactile feedback for typing, acts as a protective cover for the touchscreen, and enables data input through the device's existing touchscreen infrastructure. This multi-functionality eliminates the need for separate wireless communication hardware.
Solution Approach 2:
The keyboard system utilizes the touchscreen's existing capacitive sensing capability to detect key presses. The conductive traces on the flexible substrate work passively with the touchscreen controller, eliminating the need for active wireless communication circuits and power management systems.
3Reliability
If a keyboard uses traditional electric connection methods, then reliable data transmission is achieved, but design flexibility and portability are limited
Solution Approach 1:
The keyboard overlay is designed as a flexible, removable component that can be adapted to different touchscreen devices. The flexible substrate allows the keyboard to conform to the device's surface, and the capacitive coupling mechanism ensures reliable data transmission without rigid electrical connections, enhancing both reliability and design flexibility.
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 a compact, cost-effective, and versatile keyboard solution for electronic devices, allowing for easy data input through physical key pressing operations without the need for electric circuits or batteries, and reduces the risk of loss by being detachable and attachable to the device's exterior cover.
Implementation Method 1
a device that grasps an intention on presence/absence of a user's operation using a change in capacitance
Data Source
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AI summary
Various embodiments of the present invention relate to an electronic device having an auxiliary device that can be attached/detached. The disclosed device comprises: a first electronic device having a touch screen arranged thereon; and a second electronic device arranged to be forced against at least a partial area of a surface of the touch screen such that data is input to the touch screen by a pressing operation, wherein the second electronic device may comprise a keypad unit, which comprises an array of multiple key tops that are pressed, and a substrate, which operates the touch screen by means of pressing of the key tops.