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Touch screens

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KLUniversity
KLUniversity

This document provides an overview of different types of touchscreen technologies, including resistive, capacitive, infrared, and surface acoustic wave screens. Resistive screens work by using two electrically conductive layers that bend to register a touch. Capacitive screens store electrical charges in a grid of wires to detect touch input. Infrared screens detect interruptions in a pattern of light emitted by infrared LEDs. Surface acoustic wave screens use transducers and reflectors to detect where touch-generated waves are absorbed on the screen surface. The document aims to explain the basic functioning and history of different touchscreen technologies.

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WHAT IS HAPPENING????
Touch screens
HOW TOUCHSCREENS WORK???
THINGS IN DISCUSSION
HISTORY OF TOUCHSCREENS
Touch screens
Types of touchscreens (most commonly used) 1.Resistive These screens literally resist your touch; if you press hard enough you can feel the screen bend slightly. This is what makes resistive screens work two electrically conductive layers bending to touch one another. Resistive touch screens are durable and consistent, but theyre harder to read because the multiple layers reflect more ambient light.
Capacitive touch screens Capacitive touch screens are constructed from materials like copper or indium tin oxide that store electrical charges in an electrostatic grid of tiny wires, each smaller than a human hair. There are two main types of capacitive touch screens 1. surface 2. projective. Surface capacitive uses sensors at the corners and a thin evenly distributed film across the surface Projective capacitive uses a grid of rows and columns with a separate chip for sensing
Advanced touch screen technologies 1. Infrared In infrared touch screen technology, an array of X and Y axis is fitted with pairs of IR Leds and photo detectors. Photo detectors will detect any image in the pattern of light emitted by the Leds whenever the user touches the screen. 2. Surface Acoustic wave: The surface acoustic wave technology contains two transducers placed along X-axis and Y- axis of the monitors glass plate along with some reflectors. When the screen is touched, the waves are absorbed and a touch is detected at that point. These reflectors reflect all electrical signals sent from one transducer to another. This technology provides excellent through put and quality
Touch screens
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Touch screens

  • 7. Types of touchscreens (most commonly used) 1.Resistive These screens literally resist your touch; if you press hard enough you can feel the screen bend slightly. This is what makes resistive screens work two electrically conductive layers bending to touch one another. Resistive touch screens are durable and consistent, but theyre harder to read because the multiple layers reflect more ambient light.
  • 8. Capacitive touch screens Capacitive touch screens are constructed from materials like copper or indium tin oxide that store electrical charges in an electrostatic grid of tiny wires, each smaller than a human hair. There are two main types of capacitive touch screens 1. surface 2. projective. Surface capacitive uses sensors at the corners and a thin evenly distributed film across the surface Projective capacitive uses a grid of rows and columns with a separate chip for sensing
  • 9. Advanced touch screen technologies 1. Infrared In infrared touch screen technology, an array of X and Y axis is fitted with pairs of IR Leds and photo detectors. Photo detectors will detect any image in the pattern of light emitted by the Leds whenever the user touches the screen. 2. Surface Acoustic wave: The surface acoustic wave technology contains two transducers placed along X-axis and Y- axis of the monitors glass plate along with some reflectors. When the screen is touched, the waves are absorbed and a touch is detected at that point. These reflectors reflect all electrical signals sent from one transducer to another. This technology provides excellent through put and quality