Floating Input Knob for Touch Screen Detection
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Solution Overview
Problem
Touch screen devices face challenges in accurately detecting and translating touch events on a touch-sensitive surface, particularly when used with external mechanical input devices that lack direct electrical connections, which can lead to reduced accuracy and interference with existing touch detection technologies.
Innovation Solution
The introduction of an input knob that 'floats' on the touch surface, using a conductive mass and internal switches to register touch events through electrically-decoupled digital bits, allowing for rotary and translational movements to produce digital encoder signals without direct hardwired connections, enhancing touch functionality and compatibility with various touch detection technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an external mechanical input device is used without direct electrical connections, then ease of operation and versatility are improved, but measurement precision and detection accuracy deteriorate
Solution Approach 1:
The patent introduces a conductive mass as an intermediary element that bridges the mechanical input device and the capacitive touch sensor without requiring direct electrical wiring. The conductive mass couples the mechanical movements to the capacitive field, enabling signal transmission while maintaining the wireless, wire-free design. This intermediary allows the system to achieve both ease of operation and adequate detection precision.
2Difficulty of detecting and measuring
If a conductive mass is introduced to enable touch registration, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the conductive mass with the existing capacitive touch sensor infrastructure. The conductive mass is positioned to interact with the capacitive field already present on the touch screen, combining mechanical input capabilities with the existing electrical detection system. This merging approach enables detection capability enhancement while minimizing the addition of separate, complex subsystems.
3Reliability
If internal switches are used to bring conductive mass into contact with touch surface, then reliability of touch event registration is improved, but device complexity increases
Solution Approach 1:
The patent employs dynamic switching mechanisms that allow the conductive mass to be selectively coupled to the capacitive touch sensor based on user input. The internal switches dynamically connect or disconnect the conductive mass from the sensor, enabling reliable registration of discrete touch events while maintaining a relatively simple overall structure. The dynamic nature allows the system to achieve reliability through controlled connectivity rather than permanent complex wiring.
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
This solution enhances touch functionality by providing accurate and reliable registration of touch events, improving detection accuracy and compatibility with different touch technologies, including capacitive and infrared systems, while allowing for use with gloves or in harsh weather conditions.
Implementation Method 1
a projective capacitance-based touch screen may use an electrode grid to project an electric field through a substrate. Contact with the touch surface at or more discrete points is detected by the microcontroller by monitoring the electric field effects of the contact.
Implementation Method 2
The moveable member is configured to selectively output two or more bits of data indicative of a discrete touch event in response to a movement of the moveable member, with the two or more bits of data representing at least a speed and a direction of the movement of the moveable member.
Data Source
AI summary
An input knob for use with a touch screen device includes stationary and moveable members. The stationary member adheres to a touch screen of the device. The moveable member moves relative to the stationary member, and is secured to the surface via the stationary member. The moveable member produces touch events on the touch surface as bits of data in response to movement of the moveable member. The moveable member may include a rotary encoder. The stationary member may include conductive pads in contact with the surface and in selective contact with a conductive mass of the moveable member. The moveable member may be ring-shaped, removeable and repositionable with respect to the surface, and/or constructed of or coated by dielectric materials. The knob may lack a direct hardwired electrical connection to or through the surface. A display system includes the touch screen device and knob.