Haptic Matrix Driving with Floating Lines to Reduce Crosstalk
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Solution Overview
Problem
Existing haptic effect technologies face challenges in reducing unwanted parasitic haptic effects in non-addressed haptic elements, leading to user confusion and a compromised experience, especially in matrix-based interfaces like keyboards.
Innovation Solution
A haptic element matrix with a driving circuit that addresses haptic elements by applying specific voltage pulses and leaving non-addressed rows and columns in a floating state, reducing parasitic effects and enhancing the perceived haptic feedback with phased voltage applications and impedance control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all rows and columns are driven with voltage in a matrix-based haptic interface, then haptic feedback can be provided to multiple elements, but unwanted parasitic haptic effects occur in non-addressed elements causing user confusion
Solution Approach 1:
The haptic element matrix is segmented into addressed and non-addressed rows and columns. The driving circuit selectively activates only the specific row and column corresponding to the touched element, while leaving other rows and columns in a high-impedance floating state. This segmentation isolates the active haptic element from parasitic effects in inactive elements.
Solution Approach 2:
Different electrical states are applied to different parts of the matrix: the addressed row and column receive voltage signals to generate haptic feedback, while non-addressed rows and columns are maintained in a high-impedance floating state to minimize parasitic effects. This local differentiation of electrical properties eliminates unwanted haptic sensations in non-addressed elements.
2Object-affected harmful factors
If non-addressed rows and columns are left floating, then parasitic haptic effects are reduced, but additional control complexity is introduced in the driving circuit
Solution Approach 1:
The driving circuit employs periodic two-phase voltage application to achieve both haptic actuation and parasitic effect reduction. In the first phase, voltage is applied to drive the addressed element; in the second phase, the circuit transitions to a floating state for non-addressed elements. This periodic switching enables selective haptic feedback while minimizing parasitic effects through controlled temporal sequences.
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 approach effectively minimizes unwanted haptic effects in non-addressed elements, providing a more pronounced and precise haptic experience while reducing hardware requirements and allowing for simultaneous haptic feedback from multiple elements.
Implementation Method 1
Haptic effect, for example provided by haptic effect elements, such as piezoelectric elements
Data Source
AI summary
It is an object to provide a device that may provide haptic effect. According to an embodiment, a device comprises a haptic element matrix comprising haptic effect elements, wherein the haptic effect elements are electrically arranged into rows and columns and a driving circuit. The driving circuit may be configured to, in a first phase drive an addressed column of the haptic element matrix with a first voltage; drive an addressed row of the haptic element matrix with a second voltage, leave at least one column of the haptic element matrix to a floating voltage while driving the addressed column and the addressed row; and leave at least one row of the haptic element matrix to a floating voltage while driving the addressed column and the addressed row. The device may reduce crosstalk between the haptic effect elements. A device, a method, and a computer program product is provided.