Understanding the Touchpad and its Functions

The touchpad is a substitute for the mouse that has been widely used by computer users in general, usually this hardware is found on laptops or notebooks. But make no mistake, desktop computers can also use the Touchpad.

Understanding the Touchpad and its Functions

Understanding Touchpad

A touchpad is a pointing device (pointer) consisting of a special surface that can translate the movement and position of the user’s finger to their relative position on the screen. The touchpad is a common feature of laptops and is also used instead of a computer mouse in small desk spaces.

The touchpad provides special assistance for users to do work that always relies on the mouse excessively. Touchpads vary in size but are rarely made more than 40 cm² (6.3 x 6.3 cm or about 6 inches²). Touchpads can also be found on Personal Digital Assistants (PDAs) and some portable media players, such as the iPod using the click wheel.

The purpose of creating a touchpad is to make the mouse comfortable to use, which in the past used a mouse to require a fairly large area, and required a flat base. With the touchpad, users can still use a computer or laptop anywhere, even in a narrow place.

Touchpad Functions

Talking about the touchpad function can not be separated from the history of the emergence of the idea of ​​​​a portable computer which was sparked by Alan Kay at Xerox PARC in 1970. Since then, this idea has been continuously developed so that the idea was found to add a mouse replacement device into a portable computer.

How does the Touchpad work?

  • In the matrix approach, a series of conductors are arranged in an array of parallel lines in two layers, separated by an insulator and crossing each other at right angles to form a grid. High-frequency signals are given sequentially between pairs in a two-dimensional grid array. The current passing between the nodes is proportional to the capacitance. When a virtual ground, such as a finger is placed over one of the junctions between the conductive layers several electrical fields are short-circuited to this ground point, resulting in a large capacitance change at that point. This method received US Patent 5,305,017 granted to George Gerpheide in April 1994.
  • The capacitive shunt method, described in the application note by Analog Devices, senses changes in capacitance between the transmitter and receiver that are on opposite sides of the sensor. The transmitter creates an electric field that oscillates at 200-300 kHz. If a ground point, such as a finger is placed between the transmitter and receiver, some of the field lines are pushed away, reducing the capacitance.

That’s the article about Understanding the Touchpad and its Functions, I hope this article can be helpful and useful for you. Thank you.

Someone who has an aloof personality, without knowing the outside world only through the online world.

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