Digitizers are electronic screens used in tablet PCs, graphic tablets, and other devices using touch screens. They are designed to detect pressure exerted over the screen and convert it to electronic signals, which are then processed as user commands. They may be operated with finger presses, but most users prefer to use a stylus or digitizing pen for better precision and grip.
Types Of Digitizers
Kinds of Digitizers include the following:
Active digitizers
Active digitizers emit electromagnetic signals that react to the metal tip of a stylus.
They can track the stylus without touching the tip, allowing the user to hover over the screen without accidentally pressing buttons.
They also allow the hand to rest on the screen without affecting the movement of the stylus.
They are usually installed behind the screen to maintain visibility, although most devices have protective overlays to protect the LCD.
They can be used with pressure-sensitive pens to create different brush and pen strokes.
Passive digitizers
Passive digitizers detect stylus pressure and movement only upon direct contact.
The pointer usually jumps to a certain location when pressed, which tends to cause slow and inaccurate movement.
They respond to all forms of pressure, so placing the hand on the screen can move the cursor and accidentally press buttons.
They are commonly used in small touch screen devices and early tablet PCs.
Choosing Digitizers (Buying Tips)
Sensitivity: Choose a highly sensitive digitizer to accurately detect stylus movement. Smaller screens and fine-point pens usually require more sensitive digitizers for navigation. Look for adjustable or pressure-sensitive surfaces if you frequently use the freehand or handwriting function.
Hover speed: Choose a digitizer that moves the pointer at moderate speeds. Fast-moving pointers can be difficult to control and operate. Look for a lower speed if you have a small screen or poor vision to better track movement.
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