Multi-Touch Pad Layout for Motion Detection With One Electrostatic Sensor
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Solution Overview
Problem
Conventional touch sensing technologies, such as capacitive touch pads and electrostatic sensors, require significant space and resources, and electrostatic sensors are limited to distinguishing only two input signals due to their two electrode inputs, restricting their ability to detect multiple touch points efficiently.
Innovation Solution
A single electrostatic sensor is connected to multiple touch pads through a plurality of electrodes, each connected to distinct voltage sources, allowing it to generate an output based on voltage differences to detect motion and direction without increasing the number of sensors, and incorporating an analog-to-digital converter to process these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional electrostatic sensors with two electrode inputs are used, then the sensor can distinguish only two input signals, but the ability to detect multiple touch points is restricted
Solution Approach 1:
The patent makes a single electrostatic sensor perform multiple functions by connecting it to multiple touch pads through different voltage sources. The sensor can distinguish signals from multiple touch points (e.g., 4 touch pads) using only two electrode inputs by leveraging the distinct voltage levels provided by each touch pad's connection to different voltage sources (VDD, VSS, or intermediate voltages). This multi-functionality approach allows one sensor to replace what would traditionally require multiple sensors.
Solution Approach 2:
The patent changes the electrical parameters (voltage levels) associated with each touch pad to enable the single electrostatic sensor to distinguish between multiple touch points. Each touch pad is connected to a different voltage source or voltage combination, creating unique voltage signatures that the sensor can detect and differentiate. This parameter-based differentiation allows the sensor to identify which specific touch pads are being activated without requiring additional sensor elements.
2Adaptability or versatility
If capacitive touch technology is used to enable multiple touch sensing, then touch detection capability is improved, but device space and cost increase due to dedicated host IC and custom PCB designs
Solution Approach 1:
The patent merges the functionality of multiple touch pad detections into a single electrostatic sensor interface. Instead of requiring separate capacitive touch controllers and dedicated PCB traces for each touch pad, the invention combines all touch pad signals into the two electrode inputs of one electrostatic sensor. This merging approach consolidates the multi-touch sensing capability into a single sensor unit, significantly reducing the space required for sensing circuitry and eliminating the need for custom PCB patterns associated with traditional capacitive touch solutions.
3Ease of operation
If conventional touch sensing with sensing electrodes on surface or beneath shielding layer is used, then touch sensing function is achieved, but available surface area and space are limited
Solution Approach 1:
The patent replaces the traditional mechanical/electrical sensing electrode structure with an electrostatic sensing approach. Instead of requiring physical sensing electrodes mounted on or beneath the display surface, the invention uses the electrostatic sensor to detect voltage changes caused by touch interaction with the display surface itself. This substitution allows the entire display surface to function as the sensing area, eliminating the need for dedicated electrode structures and maximizing the available touch-sensitive surface area.
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 configuration enables efficient detection of motion and direction across a larger area with reduced physical space and cost, supporting multiple touch points without additional sensors, and can be integrated into devices like smart glasses and smartphones.
Implementation Method 1
an electrostatic sensor comprised of a first electrode input and a second electrode input, the first electrode input is electrically connected via a first group of electrodes to a first group of touch pads of a plurality of touch pads, and the second electrode input is electrically connected via a second group of electrodes to a second group of touch pads of the plurality of touch pads
Data Source
AI summary
Systems, apparatuses, methods, and computer program products for multi touch pads for object detection are provided. The multi touch pads are each electrically connected via an associated electrode to one or two electrode input ports of an electrostatic sensor. When a touch pad is touched a voltage is generated at the associated electrode input of the electrostatic input. As two touch pads detect touch over time from a motion, the electrostatic sensor detects the motion from the difference in voltage signals received. The electrostatic sensor generates a sensor signal output that may be transmitted to one or more additional circuitries to indicate that motion has been detected, which may trigger one or more operations depending on an application.