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How Do Touch Screens Work

Touch screen technology is known to have been invented in 1965, however the extensive use of the technology began with the commercial growth of computer industry. With rising craze of touchscreen, market for touchscreen gadgets such as phones, laptops, tablets etc. has significantly grown in the last decade.

Touchscreen is like an invisible keyboard; so when you press a key, it completes an electrical circuit through which the current flows. The variation in current from different keys is detected by the processor to differentiate and understand different commands.

Normally, layered on the top of an electronic visual display of an information processing system, it is an input device through which the user can control information with the help of a stylus or by merely using their fingers.

How Do They Work?

There are different kinds of screens, each of which works in a different way. Let us discuss them in detail:

  • Resistive Screen – One of the most popular technology at the time, resistive touchscreens comprise of a normal glass panel covered with a conductive and a resistive layer. The layers are kept apart by spacers along with a scratch resistant layer placed on top. The upper layer comprises of polyester plastic which is bonded to a rigid lower glass layer. When a user touches the screen, the two layers make a contact in that exact spot. An electrical current runs between the two layers and as the polyester layer touches the glass, it completes the circuit like any other key on the keyboard. A chip is placed inside the screen which detects the coordinates of the point of contact between the layers and translates it into signals that are used by the device to understand and translate the command.
  • Capacitive Screen – The screen constitutes multiple layers of glass. Both inner and outer layer conduct electrical charge. Thus, the screens behave like two electrical conductors separated by an insulator or capacitor. When the user touches the screen with his finger, , the electrical field of the outer layer is altered and the alteration point is detected by sensors placed on the four corners of the screen. The alteration point acts as One distinctive feature of capacitive screens is that they can be touched in more than one place at once.
  • Infrared Screen – An infrared touch screen is characterized by a grid pattern of LEDs and light detector photo cells arranged on opposite sides of the screen. The LEDs shine infrared light in front of screen and specific beams are interrupted when you touch the screen at a certain point. This helps the sensors in detecting the exact location of the touch.

For more information about gadgets and devices, contact Centex Technologies at (972) 375 - 9654.

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