User's Manual

PointBlank Product Specification, Rev A
3 Overview
A PointBlank enabled DLP® projector provides an interactive white board capability without
requiring a white board or special screen. The PointBlank system is comprised of a laptop or
desktop computer with USB mouse capability, a PointBlank enabled DLP® projector and a
pointing device with a light sensor and RF transmitter. The PointBlank™ system is depicted in
Figure 1.
PointBlank-enabled
DLP® projector
PBM AirDraw II
PC or laptop
feedback via RF
mouse via
USB HID
projected image
with proprietary
PointBlank encoding
light sensor
measurement
image source
(VGA, DVI)
pointing
oint
DLP® projector
PC or laptop
feedback via RF
mouse via
USB HID
projected image
with proprietary
PointBlank encoding
light sensor
measurement
image source
(VGA, DVI)
pointing denvice
PointBlank-enabled
DLP® projector
PC or laptop
feedback via RF
mouse via
USB HID
projected image
with proprietary
PointBlank encoding
light sensor
measurement
image source
(VGA, DVI)
pointing nen vce
PointBlank-enabled
DLP® projector
PC or laptop
feedback via RF
mouse via
USB HID
projected image
with proprietary
PointBlank encoding
light sensor
measurement
image source
(VGA, DVI)
Interactive Pen
Figure 1 PointBlank System Diagram
The computer sources an image to the projector over VGA, DVI/HDMI or another interface. The
PointBlank enabled projector displays the source image with special encoded patterns that the
pointing device measures and transmits back to the projector over the RF link. These
measurements allow the PointBlank projector to determine the screen location that the pointing
device is directed at. Once the pointer location is known, the projector software sends it to the
computer using the USB Human Interface Device (HID) interface. Standard Microsoft drivers
intercept these coordinates just as a standard mouse device would send them and interacts with
the application being projected accordingly. While any mouse driven application can interact with
the PointBlank projector, additional application software can be developed to enhance how the
pointing device can interact with the computer.
The system does not require any calibration and can work over a wide range of screen lumens,
screen sizes, pointing device distance from screen and ambient lighting conditions. It also works
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