Piezo Transducer Haptics in Pressure-Sensitive Keyboards
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Solution Overview
Problem
Conventional keyboards lack effective haptics for variable pressure sensitive keys, which limits user feedback and intuitive control, especially in gaming applications where precise pressure sensitivity is necessary.
Innovation Solution
Implementing haptics-enabled keyboards with piezo transducers that provide variable vibration feedback corresponding to the pressure applied to each key, allowing for independent haptics motion on individual keys without affecting adjacent keys, and integrating this technology into existing keyboard systems without requiring mechanical or electrical changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional rubber dome key mechanism is used, then keyboard structure is simple and manufacturing is easy, but haptics feedback is insufficient for variable pressure sensitive keys
Solution Approach 1:
The patent combines the conventional rubber dome key mechanism with piezo transducer elements to create a hybrid system. The piezo transducer is integrated within the key structure, merging mechanical key actuation with electronic haptics feedback generation, thereby maintaining structural simplicity while enhancing feedback quality
Solution Approach 2:
The piezo transducer acts as an intermediary element between the mechanical key press and the user's finger. It converts electrical signals into mechanical vibrations that are transmitted through the key structure to the user's finger, providing enhanced haptics feedback without requiring fundamental changes to the keyboard architecture
2Measurement precision
If piezo transducers are integrated into each key, then haptics feedback precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The keyboard is divided into independent key units, each with its own piezo transducer. This segmentation allows each key to be optimized independently for haptics feedback precision while maintaining modular manufacturing processes that reduce overall complexity
Solution Approach 2:
The piezo transducer serves multiple functions: it provides haptics feedback, assists in key actuation, and can be used for pressure sensing. This multi-functionality reduces the need for separate components, thereby managing device complexity while maintaining high feedback precision
3Measurement precision
If independent haptics actuation circuitry is provided for each key, then haptics motion control precision is improved, but power consumption increases
Solution Approach 1:
The independent haptics actuation circuitry operates periodically rather than continuously, activating piezo transducers only when keys are pressed or when haptics feedback is required. This periodic operation maintains high control precision while significantly reducing overall power consumption compared to continuous operation
Solution Approach 2:
The system uses the existing key press event as a trigger for haptics actuation, eliminating the need for separate sensing and control circuits for each key. The piezo transducer is directly driven by the key matrix controller, allowing the system to serve itself and reduce power consumption
4Volume of moving object
If haptics actuation circuitry is integrated between keycap and keyboard base, then space utilization is improved, but ease of manufacture and assembly deteriorates
Solution Approach 1:
The haptics actuation circuitry is nested within the existing keyboard structure, specifically between the keycap and the keyboard base. The piezo transducer is positioned within the key switch assembly, utilizing existing spaces and structures, thereby minimizing the keyboard profile thickness while maintaining manufacturability through standardized assembly processes
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 user experience by providing intuitive pressure feedback, enabling precise control in gaming and other applications with reduced power consumption and compatibility with legacy systems.
Implementation Method 1
separate haptics actuation circuitry...configured to independently impart haptics motion to the depressable keycap
Implementation Method 2
provide variable vibration feedback corresponding to the pressure applied to each key
Data Source
AI summary
Systems and methods are employed for implementing haptics for pressure sensitive keyboards, such as the type of keyboards having keys that produce alternating digital open/short signals that emulate actuation of conventional “momentary on” digital keys. The disclosed systems and methods may be implemented to provide haptics for both touch typing and variable pressure sensitive operation of a pressure sensitive keyboard. Users of a variable pressure keyboard may be provided with a variable pressure haptics effect, e.g., to enable the user to intuitively understand from the haptics vibration produced by the key how much pressure they are applying to a given key at any given time. Vibration characteristics (e.g., vibration rate, vibration waveform pattern, etc.) of a given pressed key may be varied in real time in coordination with, or in response to, corresponding changes in user pressure applied to the same given key.