Digital projectors are those video projectors which are used in conferences for presentations. The digital projectors receive video signals from, usually, desktop computers and display images on large screens which can be easily comprehended by all in the gathering.

Two Types of Digital Projectors
To begin with, there are two technologies used by digital projectors, the older one being the LCD, liquid crystal display with independent transparent panels of LCD for each constituent primary color (red, blue and green.) The image transmission depends on the signal received by the projector from PC which redirects the light signals through these LCD panels and lens onto a screen. The LCD projectors look pretty similar to older slide projectors and are simple in construction and thus cost less in comparison to their successors DLP projectors. The LCD can be thought of as slides placed at the focal length of the lens making it complete. Clarity of picture in LCD projectors depends on the number of pixels it is set for. (Pixels are smallest area of data or picture holders)

DLP Projectors: The Latest of the Digital Projectors
Digital Light Processing or DLP is a technology developed by Texas Instruments in 1987. DLP projectors bring in a paradigm difference in technology in image projection to board rooms. Unlike their predecessors, DLP projectors make use of tiny mirrors or micro mirrors to reflect light images to pass through the projector lens and onto a screen. Each mirror can be thought of as representing a pixel. The mirrors reflect primary colors in rapidly rotating succession as actuated by a rotating color filter wheel. The image of rapidly changing colors ‘constructs’ images for human eye perception. The micro mirrors are collectively called as DMD or ‘digital micromirror device’.

For the sake of enhancing picture clarity, the rotating wheel is provided with a plain patch which allows plain white light. This type of DMD projectors are also known as single chip projectors. The three chip projectors are a bit complicated but offer better clarity. Here a prism splits the light from lamp into primary colors which are redirected to DMD which recombines them before projecting through the lens.

Where Is the Difference
DLP projectors are lighter and give far better pictures. Single chip resolves 16.7 colors while the three chip model does a, hold your breath, 35 trillion colors.

Commercial Models
Texas Instruments is the pioneer who owns the patent for DLP technology. Fraunhofer Institute of Dresden of Germany developed the same technology simultaneously and markets it as Spatial Light Modulators. HP, Samsung are other market leaders in both LCD and DLP technologies.

Mobile Digital TV

P-380, a mobile Digital TV with built-in DVB-T receiver by NETOPT is one of its kind, a portable media player in a single stylish unit. The P380 can be used as a second TV in the home or for watching your favorite program or sports anywhere and anytime and is ideal in an office, or for camping or for commuters.

A 3.6 inches screen with high resolution TFT LCD display is the most attractive feature. It is enabled with built-in antennae that help in receiving DVB-T TV and radio. Another exciting feature is the tele text playback of 3 hours with inclusion of EPG. External memory can be increased with the help of SD/MMC chips 4.2 so that you can store your music, videos and pictures.

It can also be used an alternative to Photo viewers and portable DVD players as it supports both the features. It also supports the USB feature for you to transfer data or access your files from a USB device. Navigation is also added to the front screen and it allows you to control various activities from the front only like, Change the Channels, adjust the volume, going to the sub-menus and returning back to the main menu.

In addition to this Navigation key, there are few more buttons or controls for functions like, Play/Pause, Fast Forwarding, and Rewind. A lock slider is added for security and an On/Off key. The On-Screen menu lists various medias which can be selected by scrolling up or down. These are TV, Movies, and Pictures, Radio, Games, Music and settings. Some games are added by default.

Playback for Music is 6 hours and for videos as already said is 4 hours. Supply to the P380 is by Lithium ion battery which is non-removable. It can also act as a SD Set top box for a TV set as it has built-in DVB-T TV and FM receiver.

In addition to this, TV playback is of 3 hours with the help of no-removable Lithium-ion battery. Reading all about the features and its applications for Media Entertaining people and users, it seems to be a power pack device for Multimedia.

It is not out yet in the market but has been launched. You can avail this extremely power pack media device for $395. Retailing and stocking is still in progress and soon we can enjoy the device.