25-08-2017, 09:32 PM
Touch Screen Technology
[attachment=62719]
ABSTRACT
A touch screen is an electronic visual display that can detect the presence & location of a touch within the display area. The term generally means touching the display of the device with a finger, hand or other passive devices such as stylus. This technology has two main attributes. First it enables one to interact with what is displayed & secondly it lets one to do so without requiring any intermediate device that would need to be held in the hand. They also play a prominent role in design of digital appliances such as personal digital assistant (PDA), satellite navigation devices, mobile phones, video games etc. There are a variety of touchscreen technologies such as “Resistive”,”Surface Acoustic Wave” (SAW), and “Capacitive”. Different technologies may be used to determine the location of touch by different means. Then location is sent to the controller for processing. The SAW technology uses ultrasonic waves that pass over touch screen panel. The Capacitive touchscreen panel consists of an insulator coated with a transparent conductor (such as Indium Tin Oxide ITO). Touch screen is a developing technology. The development of multipoint touchscreen facilitated the tracking of more fingers than one finger on the screen thus the operations that require more than one finger are possible. These devices also allow multiple users to interact with the touchscreen simultaneously. With the growing field of touchscreen the marginal cost of this technology is decreasing.
[attachment=62719]
ABSTRACT
A touch screen is an electronic visual display that can detect the presence & location of a touch within the display area. The term generally means touching the display of the device with a finger, hand or other passive devices such as stylus. This technology has two main attributes. First it enables one to interact with what is displayed & secondly it lets one to do so without requiring any intermediate device that would need to be held in the hand. They also play a prominent role in design of digital appliances such as personal digital assistant (PDA), satellite navigation devices, mobile phones, video games etc. There are a variety of touchscreen technologies such as “Resistive”,”Surface Acoustic Wave” (SAW), and “Capacitive”. Different technologies may be used to determine the location of touch by different means. Then location is sent to the controller for processing. The SAW technology uses ultrasonic waves that pass over touch screen panel. The Capacitive touchscreen panel consists of an insulator coated with a transparent conductor (such as Indium Tin Oxide ITO). Touch screen is a developing technology. The development of multipoint touchscreen facilitated the tracking of more fingers than one finger on the screen thus the operations that require more than one finger are possible. These devices also allow multiple users to interact with the touchscreen simultaneously. With the growing field of touchscreen the marginal cost of this technology is decreasing.