NEC LCD72VX Guida Di Riferimento
Of course, a software application is needed, which will enable you to develop new or
customize existing touch applications to meet specific applications.
customize existing touch applications to meet specific applications.
What Touch Technologies are Currently Available?
LIGHTPENS
Lightpens are an early and inexpensive technology that enables one to use a stylus
directly on a display. Something not generally appreciated about lightpens is that they
work with rear-screen projection systems as long as the data projector uses cathode beam
technology. That is, they do not work with LCD projectors, for example. Hence, lightpens
provide an extremely cost-effective means to convert a rear projection system into an
interactive electronic whiteboard. This includes NEC's CRT-based projection
systems operating in rear projection mode. On the other hand, in some situations where
one needs to operate directly on the display with a stylus, the lightpen is losing ground to
other technologies. These include where the stylus must be cordless, pressure sensitive,
high resolution, or work with a LCD.
CAPACITIVE
Capacitive is noted for providing a unique combination of superior durability, optical clarity
and sensitivity to touch. Resistive provides exceptional touch flexibility, responding to a
wide range of touch input.
Analog capacitive touchscreens are made by adding conductive coatings to a clear glass
sensor. Voltage is applied to the four corners of the screen along an X-Y axis. When the
screen is not in use, electrodes spread the voltage, creating a uniform field. When a finger
touches the screen, the field recognizes a disturbance. The X-Y coordinate of the touch is
sent from the controller to the PC serial port. Analog capacitive touchscreens are made
adding conductive coatings to a clear glass sensor.
1. Voltage is applied to the four corners of the
screen along an X-Y axis.
2. When the screen is not in use, electrodes spread
out the voltage, creating a uniform field.
3. When the screen is touched by a finger, the field
recognizes a disturbance.
4. The X-Y coordinate of the touch is then sent from
the controller to the PC serial port.
Because the glass and the bezel that mounts it to
the monitor can be sealed, the touchscreen is both
durable and resistant to contaminants like water,
dust, dirt and grease. This makes all capacitive
touchscreens ideal for harsh environments like retail
displays, gaming, vending, public kiosks and
industrial applications.
RESISTIVE TOUCH
screen along an X-Y axis.
2. When the screen is not in use, electrodes spread
out the voltage, creating a uniform field.
3. When the screen is touched by a finger, the field
recognizes a disturbance.
4. The X-Y coordinate of the touch is then sent from
the controller to the PC serial port.
Because the glass and the bezel that mounts it to
the monitor can be sealed, the touchscreen is both
durable and resistant to contaminants like water,
dust, dirt and grease. This makes all capacitive
touchscreens ideal for harsh environments like retail
displays, gaming, vending, public kiosks and
industrial applications.
RESISTIVE TOUCH