On-Screen Keyboard with Capacitive Feedback for Typing Efficiency
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Solution Overview
Problem
Conventional on-screen keyboards are inefficient for typing large amounts of data due to slow data entry speed, lack of real-time feedback on finger position, and are not suitable for head-up or virtual reality displays, where ambient light issues and image processing demands are problematic.
Innovation Solution
A method and computer program product that displays both keystroke information and finger standby positions on an on-screen keyboard, using a physical keyboard with capacitive detection electrodes to generate key signals and provide real-time feedback without requiring users to stare at the physical keyboard, suitable for integration with head-up or virtual reality displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If camera lenses are used to capture finger position images, then finger position feedback is provided, but image processing consumes large hardware resources and affects system performance
Solution Approach 1:
The patent replaces the optical image capture system (camera lenses) with an electrical sensing system (capacitive detection electrodes). The capacitive electrodes directly detect finger position through electrical field changes, eliminating the need for image processing while providing real-time finger position feedback, thus resolving the contradiction between information feedback and hardware resource consumption
Solution Approach 2:
The patent creates an electrical copy of the finger position information through capacitive sensing, where the detection electrodes generate electrical signals that represent finger position and keystroke information. This electrical copy replaces the optical image copy, providing the same feedback function with significantly reduced processing requirements
2Loss of information
If real-time image processing is performed on captured images, then finger position feedback is provided, but system performance is affected due to high resource consumption
Solution Approach 1:
The patent substitutes the computationally intensive image processing system with a simple electrical signal processing system. The capacitive detection electrodes directly generate electrical signals corresponding to finger position and keystroke events, which can be processed in real-time with minimal computational resources, thus maintaining system performance while providing continuous feedback
Solution Approach 2:
The patent implements continuous real-time detection through periodic sampling of capacitive signals from the detection electrodes. This periodic electrical signal generation provides continuous finger position feedback without the computational burden of continuous image processing, maintaining system responsiveness and performance
3Loss of information
If camera lenses are used to capture images in low ambient light, then finger position can be detected, but image capture fails when ambient light sources are insufficient
Solution Approach 1:
The patent replaces the optical detection system (camera lenses requiring ambient light) with an electrical field-based detection system (capacitive electrodes). The capacitive electrodes detect finger position through changes in electrical field capacitance, which is independent of ambient light conditions, thus eliminating the limitation of image capture in low light environments
Solution Approach 2:
The patent changes the detection parameter from optical reflection (light-dependent) to electrical capacitance (light-independent). The capacitive detection electrodes measure changes in capacitance caused by finger proximity, providing reliable finger position detection regardless of illumination intensity, thus resolving the contradiction between detection capability and light dependency
4Loss of information
If camera lenses are used to capture finger images, then finger position feedback is provided, but misjudgment errors occur in finger position detection
Solution Approach 1:
The patent replaces the optical imaging system with direct electrical field sensing. The capacitive detection electrodes measure finger position through precise electrical field interactions, which are not subject to the optical distortions, focus issues, and image processing errors that plague camera-based systems, thus significantly improving measurement precision
Solution Approach 2:
The patent creates a direct electrical signal representation of finger position without the intermediate step of optical image capture and processing. This electrical copy bypasses the sources of misjudgment in optical systems (lens distortion, focus errors, image processing artifacts), providing more accurate and reliable finger position detection
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
Enhances data typing speed by providing real-time feedback on finger position and keystrokes, reduces misjudgment errors, and integrates seamlessly with virtual reality displays without blocking the screen, improving usability for both adept and novice typists.
Implementation Method 1
the physical keyboard includes a plurality of keycaps capable of responding to a touch on the keycap to generate a first key signal
Data Source
AI summary
A method for displaying an on-screen keyboard is applied a computing device connected to a physical keyboard and a screen, where the physical keyboard includes a plurality of keycaps capable of responding to a touch on the keycap to output a first key signal and responding to a keystroke on the keycap to output a second key signal to the computing device, and the method for displaying an on-screen keyboard includes: displaying an on-screen keyboard on a topmost layer of a display image of the screen; reading the first key signal output by the physical keyboard corresponding to the touch on the keycap; and displaying, according to the first key signal, a first key mark at a position corresponding to the touched keycap on the on-screen keyboard.