What is a graphics tablet?
A graphics tablet is primarily a digital, mostly rectangular and flat pointing and input device, which digitizes the applications and transfers them to a computer. This means that the work is done on the tablet, but can be seen on the screen of the computer. On the other hand there are the graphic tablets, which have a Display. These make the entries visible on the table itself.
Using the Graphic tablet, manual entries, drawn, painted or otherwise constructed patterns are recorded and finally transferred to the computer. Most often a Show tool, pen, puck, stylus or computer mouse is used to move around the screen.
The Tablet itself consists of a surface on which these tools leave Coordination points and a crosshair that can be moved to create the shapes, words, or drawn patterns. The pen, also called Stylus, transmits pulses to the screen, which form the coordinates as information. The pressure of the pen and other keys to use different functions hold the position or change it accordingly.
Of course, the pencil is used a bit more versatile than a simple pencil. All applications controlled are controlled via it, so also the inclination, rotation of the pen or the use of one's own fingers has an effect on the screen. In addition, many tools can be used, such as filling areas with color, geometric shapes that can be designed, cutting and rotating photos, describing the screen area, designing collages, and much more.
The graphic tablet is a pure input device. This means that, for example, images from the computer to the tablet are not visible. You can also easily transfer photos, which can then be edited. Especially the digital postprocessing of a picture makes the own pictures even more beautiful and the experiences more colorful.
How does a graphics tablet work?
Scanning a drawing, a building plan or a sketch to digitize it is costly and requires certain devices, such as a scanner or printer. The Tablet replaces these devices, because the sketch is made directly on the tablet surface and digitized immediately.
Different techniques make up the functionality of the graphics tablet. The determination of the position can take place over several procedures, so by Ultrasonic, with a magneto-mechanical, position-metric or inductive procedure. Basically there is a coil in the used pen which generates a electromagnetic field by placing it on the screen. This triggers conductor loops that determine the signal strength and thus determine the pointing position. By pressure or rotation of the pen the digitization and the modulation are released and passed on together with the position data to the computer.
The pen can either contain a battery, which speaks of an active input, or the pen can record the data by induction via the tablet, which then calls the procedure passive input. In addition, there are also resistive touch screens that react to pressure and heat, whereby the hand or one's own fingers can then also be used to design on the tablet.
The passive input by induction is the best known method and enables both high resolution and accuracy. In an inductive process, the screen consists of thin wires arranged in both vertical and horizontal orientation, forming a grid. The pulses are sent via this grid. These can be transmitted with a frequency of 200 to 500 Hertz. The pulses are sent from the screen to the pen, which detects the induced voltage and sends the signal to the computer, which then calculates the Position.