Research for large-sized ultrasonic touch screen
Date Issued
2008
Date
2008
Author(s)
Chiang, Kuan-Hua
Abstract
Contributing to the user-friendly convenience, touch panel has been inclined to increase in the range and layer of application. The touch panels in common use include resistive, capacitive, infrared and SAW forms. Currently the development in medium and small touch panel has already been significantly mature, moreover, applied so well in portable equipments. However, the technology of large sized touch panel is not as mature as the medium and small sized touch panel, which consists of immense potential.his discourse aims at innovating new ultra-large sized touch screen structure. The touch screen structure utilizes four ultrasonic receiving transducers and an ultrasonic transmitting transducer. The four ultrasonic receiving transducers are located on the four corners of the screen respectively. By transmitting the ultrasound from the ultrasonic transmitting transducer attached to the touch pen, the ultrasonic receiving transducer on the four corners can receive the signals in consequence of acquiring the distance between the touch point and the four corners. Simultaneously, computed through microcontroller to access the coordinate, the data will be delivered backward to the computer so that the cursor can connect to the touch pen. Owing to the errors existing in ultrasonic measurement, neural network is substituted to calculate the coordinate of touch point in this text. Although some minute errors are inevitable, the calculation through neural network still demonstrates certain accuracy. As a result, the practical experiment had been successfully proved that the cooperation of the structure and neural network is available for computing the coordinate of the touch point.
Subjects
touch
screen
ultrasonic
neural
network
Type
thesis
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