Tactile Capacitive Keyboard for Low-Latency Keystroke Detection
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Solution Overview
Problem
Conventional keyboards, such as mechanical and optical keyboards, suffer from high latency issues that hinder user experience, especially in gaming environments, due to their design and operational mechanisms, which result in increased peripheral latency and higher costs for optical keyboards with complex designs.
Innovation Solution
The development of a tactile capacitive keyboard that incorporates a touch sensor beneath each key to detect changes in capacitance, allowing for reduced operational keystroke distance and faster input registration, thereby minimizing peripheral latency, and is designed to be cost-effective with a thinner profile compared to optical keyboards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional mechanical or optical keyboard designs are used, then the keyboard structure is simple and easy to manufacture, but the latency is high and user experience is degraded
Solution Approach 1:
The patent replaces mechanical switch actuation with capacitive sensing technology. Instead of requiring physical key press mechanisms to close circuits, the system uses capacitive sensors to detect changes in electrical capacitance caused by finger proximity or contact. This substitution eliminates mechanical moving parts and reduces the distance required for input detection, thereby reducing latency while maintaining manufacturing simplicity.
Solution Approach 2:
The patent introduces an intermediary capacitive sensing layer between the user's finger and the key registration system. This capacitive interface detects electrical field changes caused by finger proximity, serving as a mediator that translates physical interaction into digital input signals faster than traditional mechanical switches, thus reducing overall system latency.
2Loss of time
If optical keyboard design is used to reduce latency, then the latency is reduced, but the cost increases and the design becomes complex
Solution Approach 1:
The patent substitutes optical sensing mechanisms with capacitive sensing technology. Instead of using light-based detection systems that require complex optical components (LEDs, photodetectors, lenses), the system employs electrical capacitance measurement that can be implemented with simpler integrated circuits and conductive materials, reducing manufacturing costs while achieving comparable or better latency performance.
Solution Approach 2:
The patent uses capacitive coupling to create an electrical copy or representation of the key press event. The capacitive sensor detects changes in electrical field that mirror the physical key interaction, allowing the system to register input events faster and more cheaply than optical systems without requiring expensive optical components.
3Ease of operation
If conventional mechanical keyboard with long operational keystroke distance is used, then the tactile feel is satisfying, but the input registration time is increased
Solution Approach 1:
The capacitive sensor begins detecting changes in electrical capacitance as the finger approaches the key surface, before actual contact is made. This preliminary detection allows the system to register input events earlier in the pressing sequence, reducing input registration time while preserving the full tactile feedback experience when the key is actually pressed.
Solution Approach 2:
The patent adds a new dimension to key detection by measuring electrical capacitance changes rather than relying solely on mechanical displacement. This additional sensing dimension allows the system to detect finger proximity and intent earlier in the pressing sequence, reducing latency while maintaining the traditional mechanical tactile feedback for user satisfaction.
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 tactile capacitive keyboard achieves significantly reduced end-to-end system latency, with input processing times as low as 10 milliseconds, enhancing user experience and competitive edge in gaming, while maintaining a similar tactile feel to mechanical keyboards and offering adjustable sensitivity for optimized performance.
Implementation Method 1
incorporates a touch sensor beneath each key to detect changes in capacitance
Data Source
AI summary
Example low latency tactile capacitive keyboards are disclosed. An example compute system includes a keyboard including a housing, a plurality of keys, and a touch sensor positioned between the housing and at least one of the plurality of keys, keyboard circuitry to detect a signal output by the touch sensor, the signal corresponding to a keystroke, and generate a code corresponding to the detected signal and processor circuitry to process the code to effect the keystroke.