Fluidic Circuit Board for Tactile Display Pin Actuation
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Solution Overview
Problem
The challenge lies in packing and manufacturing a device with thousands of actuated pins on a flat surface to display refreshable tactile patterns and images, while ensuring compactness, reliability, and cost-effectiveness.
Innovation Solution
The introduction of a Fluidic Circuit Board (FCB) separates the addressing and actuation functions, enhancing manufacturability, reliability, and economy by providing a rigid substrate for mounting components and routing fluidic power and signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If thousands of pins and actuators are packed into a tablet-like device, then the device can display refreshable tactile patterns and images, but the packaging and manufacturing complexity increases significantly
Solution Approach 1:
The device is divided into modular components: a microfluidic chip containing addressable actuators, a separate pin array, and a rigid substrate. This segmentation allows independent manufacturing and assembly of complex subsystems, reducing overall manufacturing complexity while maintaining the capability to display refreshable tactile patterns.
Solution Approach 2:
The microfluidic chip is integrated within a rigid substrate that also contains the pin array and fluid distribution channels. This nested structure packs multiple functional layers into a compact tablet-like form factor, enabling thousands of pins to be arranged on a millimeter-scale grid without proportionally increasing device complexity.
2Measurement precision
If each pin is supplied with individual power and control signals, then the device can be precisely controlled, but the power routing and control signal distribution becomes complex
Solution Approach 1:
The microfluidic chip serves multiple functions: it acts as both the actuator array and the fluid distribution network. Pressure-controlled fluidic channels simultaneously provide power delivery and precise control signals to each pin, eliminating the need for separate electrical routing infrastructure and reducing overall device complexity.
Solution Approach 2:
The device uses pneumatic pressure control through microfluidic channels to actuate pins individually. This fluidic control mechanism replaces complex electrical signal distribution, allowing precise control of each pin through pressure differential while simplifying the overall control architecture.
3Ease of operation
If the device uses soft microfluidic chips, then the actuators can be flexibly controlled, but the structural rigidity and reliability for mounting components decreases
Solution Approach 1:
The device combines soft microfluidic chip material with a rigid substrate in a composite structure. The rigid substrate provides mechanical strength and reliability for mounting components, while the soft microfluidic chip maintains its flexibility and actuator control capabilities. This composite approach resolves the contradiction between structural rigidity and actuator flexibility.
4Ease of manufacture
If the device is designed as a single integrated unit, then it can be manufactured efficiently, but the ease of repair and maintenance decreases
Solution Approach 1:
The device is segmented into replaceable modules: the microfluidic chip, the pin array, and the rigid substrate. This modular design allows individual components to be manufactured efficiently through standardized processes while enabling easy repair and maintenance by replacing faulty modules without replacing the entire device.
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 FCB improves actuation speeds, reduces power consumption, and decreases noise, while allowing for modular design and easier assembly and maintenance, ultimately leading to a more efficient and cost-effective tactile display device.
Implementation Method 1
The membrane is an actuator: it displaces outward when the chamber pressure increases above ambient air pressure, in turn displacing a pin
Implementation Method 2
the interconnect layer preferably features higher modulus material properties than the relatively soft microfluidic chips and the membrane upon which the actuators are based
Data Source
AI summary
A tactile display system that combines the sensing of a user's finger location and/or applied force, user input from buttons, keyboard, and scrollwheels and other user interface features, with a large array of movable pins that renders braille text and tactile graphic images such that patterns of pin movement depend on the user's finger location and/or applied force or input from buttons, keyboard, and scrollwheel or other user interface features.