Digital Image Projection (The roles and function of the Educational technology in the 21st century education)

1. DIGITAL IMAGE
PROJECTOR

2.  Its also called digital projection display
system, is specialized display that projects
an enlarged image on a movie screen.

3. LCD ( Liquid-crystal-display)
o the older and less expensive type employs
three transparent. The primary colors (red,
green and blue). The advantage of LCD
technology include efficiency, ease of
brightness and contrast adjustment, and high
image resolution.

5. DLP (Digital Light Processing)
o newer and more expensive scheme. A
proprietary technology developed by Texas
Instruments. Tiny mirrors are used instead of
transparent panel .The mirrors move back and
forth, varying the amount of light that reaches
the projection lens from each pixel. This
subjects the mirrors to light at each primary
colors in a rapid rotating sequence. The result is
a color-modulated image that a human eye sees
as natural color.. Advantages of DLP technology
include light weight, high contrast and lack of
pixelation.

7.  Interactive
 Full-motion audio-visual files on a personal
computer.
 Versions are available for both IBM-
compatible and Macintosh computers and can
be downloaded from the Internet.