Ultrasonic lamb wave touch screen

A touch screen, Lamb wave technology, applied in the field of intelligent electronic product design, can solve problems such as misoperation and inability to touch

Active Publication Date: 2020-07-28
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current mainstream projected capacitive touch technology must use conductive materials as the touch medium. When there are pollutants (water, swea

Method used

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  • Ultrasonic lamb wave touch screen

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] The invention is an ultrasonic Lamb wave touch screen, which uses the disturbance effect of the touch medium on the ultrasonic Lamb wave sound field to change with the position of the touch medium, and establishes pre-calibration in the effective area of ​​human-computer interaction by controlling the touch load simulator The ultrasonic Lamb wave acoustic fingerprint library of the company uses intelligent algorithms to match the measured signal with the pre-calibrated acoustic fingerprint library in practical applications, so as to realize the positioning and imaging of the touch medium on the touch screen.

[0019] Such as figure 1 Shown is a schematic diagram of an ultrasonic Lamb wave touch screen according to a specific embodiment of the present invention, which is specifically composed of a main control system 5, a sensing screen 3, a displ...

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Abstract

The invention discloses an ultrasonic lamb wave touch screen. The disturbance effect of a touch medium on an ultrasonic Lamb wave sound field changes along with the position of the touch medium. An ultrasonic Lamb wave sound fingerprint library of the touch medium is calibrated in advance. In practical application, an intelligent algorithm is used for matching an actual measurement signal with a pre-calibrated sound fingerprint library, and positioning of the touch medium on a screen plate is achieved. The ultrasonic lamb wave touch screen is mainly composed of a main control system, an ultrasonic excitation receiving module, a sensing screen and a display screen module. An ARM is used for realizing acoustic fingerprint identification by a built-in algorithm program to determine the position coordinates of the touch medium on the sensing screen, converting the position coordinates into a control instruction to communicate with the display screen through the MIPI interface, and realizing program touch at the identified position coordinates. The ultrasonic lamb wave touch screen disclosed by the invention can be used for positioning and identifying a non-conductive touch medium, andcan be used for robot touch system design and the like for reference.

Description

technical field [0001] The invention belongs to the field of intelligent electronic product design, and specifically relates to an ultrasonic Lamb wave touch screen, which utilizes the interaction between the ultrasonic Lamb wave and a touch medium to realize the human-machine interface interaction of a user's touch action. Background technique [0002] The touch screen is mainly used to capture and recognize user actions to drive various linking devices according to preset programs to realize human-machine interface interaction. The current mainstream projected capacitive touch technology must use conductive materials as the touch medium. When there are pollutants (water, sweat and other conductive media) on the screen surface or electromagnetic interference environment, it is easy to fail to touch or misuse the phenomenon. . [0003] Ultrasonic Lamb waves are ultrasonic guided waves that can propagate in the screen. When an external touch medium touches the screen, it wil...

Claims

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Application Information

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IPC IPC(8): G06F3/041G06F3/043G06N3/02
CPCG06F3/0416G06F3/043G06N3/02
Inventor 吴斌王耀辉刘秀成何存富裴宁杨增冲
Owner BEIJING UNIV OF TECH
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