The following article provides a guide on how to compare plasma LCD and rear projection HDTVs, including the differences between the technologies used in each.

Many people are confused by words in the electronic industry today such as rear projection television, plasma, and LCD flat panel. In order to understand exactly what you are buying when you purchase one of these items, you must first understand the underlying technology behind each one.

You must know whether wide screen televisions are better than regular flat screen televisions, and whether plasma screens are better LCD screens. The difference between LCD rear projection and flat panel sets is also important.

Before you purchase one of these electronic items, you should first understand exactly what their names mean so that you will not become confused by the salesman at your local electronics store. You will then be able to decide what is worth your money and what is not.

The following are several short introductions to each of these technologies used in modern televisions.

Rear Projection Television These televisions involve a lamp behind a screen which projects an image onto the screen. This technology is also known as micro display, and is different from the more traditional CRT, or cathode ray tube, technology used in older televisions.

There are three different types of micro display - namely Liquid Crystal Display (LCD), Digital Light Processing (DLP), and Liquid Crystal on Silicon (LcoS). While televisions that use micro display technology are flatter and lighter than televisions that use CRT technology, the lamps in micro displays have to be changed once every two or three years.

Plasma Television These televisions are almost always in the form of a flat panel, as they use technology that enables manufacturers to house the required electronics in a flatter panel.

A plasma television's display works in much the same way as a fluorescent lamp, consisting of two glass panels containing xenon gas between them. The gas, in the form of plasma, is injected and then an electrical charge is run through, causing it to light up in reds, blues, and greens, thus creating an image. Each pixel consists of red, blue, and green phosphors.

Traditional CRT televisions, however, contain a vacuum tube, which emits an electric beam across the surface of the tube, lighting up the phosphors. Thus these displays are larger than the modern ones.

Liquid Crystal Display Televisions

LCD rear projecting systems are not the same as LCD flat panel televisions, as rear projection LCD televisions create an image by projecting light through a transparent LCD chip, which consists of individual pixels displaying the moving video images, thus projecting the image forward through a lens that magnifies the image, onto a mirror, which finally reflects the image onto the screen.

The chip used in a rear projection television is extremely small and thus is extremely light, taking up much less space than the cathode ray tubes in more traditional televisions.

While LCD rear projection televisions are not as compact as plasma or LCD flat panel televisions, they are still much smaller than conventional televisions. These televisions are also less expensive as compared to plasma and LCD flat panel televisions, and they also have wider screens. LCD rear projection systems also provide brighter images and greater contrast.

This short introduction to HDTV technology should be of some use to you if you wish to compare plasma LCD and rear projection HDTVs. You should compare aspect ratio, screen size, resolution, HDMI interface, and price when selecting a television. You should also make a comparison between similar television models from different brands, as they may be different.

To get more information about how to compare LCD & HDTVs such as reviews of hdtv visit flatscreenhdtvguide dot com.

Digital projectors are equipments of modern technology. These are Used to convert image data directly from the computer onto a screen via lens system. Digital projectors or data visualization providence That is actually stored in a computer for presentation. These projectors enable the viewers to watch moving images from a DVD, digital versatile disc player. Advertisers or sellers Also use projectors to give demonstration thesis or products to a large number of customers. Easily it can convert written documents onto an interactive whiteboard.

Digital projectors play an important role in the formation or home theater systems. These projectors use resolution of SVGA standard ie 800 × 600 pixels in expensive devices. Cost of digital projector is Determined by its resolution as well as its brightness. If you're going to use it in large rooms or big conference halls its brightness from 1000 to 4000 Should Be ANSI lumens.

First digital projectors, projectors were introduced in 1950 Eidophor. Eidopher an overused projectors oily surface in a rotating disk with light shining through it, and employed an electron beam to Disrupt Oil in a specific Manner. Eidophor projectors were not bootable to produce colors. Nowadays there are Several models of high quality digital projectors are available in market so Eidopher projectors are less common.

Following four technologies are overused in digital projectors

High intensity CRT

Using LCD projectors LCD light gates

Texas Instruments' DLP technology

Eidophor oil-film projectors (obsolete)

At present LCD projectors use Texas Instruments' DLP technology whereas the high intensity CRT devices are Suitable for enduring installations. Entire working of cathode ray tube digital projectors is like CRT television set. These projectors are configured with one May Be That HAS RGB color tube three colors red, green and blue with a single lens, one black & white tube with a rotating color wheel or three RGB color tubes with three lenses. Cathode ray tubes having projectors are bulky Usually thats why thesis are the best projectors for fixed installations.

LCD digital projectors are portable enough and lighter in comparison to CRT and can be shifted from one place to Easily another. These are very much popular and available in sizes and shapes Various Artists. CRT and LCD digital projectors come under the category of transitive projectors.

Reflective projectors are the superior digital projectors That Provide high quality images. These are affordable and offer next level of entertainment. Everyone can enjoy home-theater applications with the help of digital projectors.

Televisions have been commercially available since their invention in the late 1920s. A Mormon inventor from Utah, Philo Taylor Farnsworth, is credited with invention of the first electronic television. He put his invention on public display September 1, 1928, and the exciting new development took off like skyrockets, until today television reaches not only around the globe, but into outer space. They have been for sale commercially since the 1930's.

Televisions are sold with monochromatic (black and white) or color displays. Older televisions used a CRT (Cathode Ray Tube), and many had old style electronic tubes inside the set around the CRT. These were later replaced by transistor technology, and eventually a new main display screen was developed. Televisions are used for replaying captured video, in closed circuit systems, and for over the air broadcasts or transmissions from cable or satellite systems. They will display video and transmit audio.

Today there is an assortment of highly technological displays available on televisions. You can still get the CRT television sets, but also you can choose from other display screens and methods of viewing. These include

- Projection TV (Rear Projection and Flat Panel)

- LCD (Liquid Crystal Display)

- LED (Light Emitting Diode)

- Plasma TV (Uses gases, not LCD)

- HDTV (High Definition Television)

- OLED (Organic Light Emitting Diode)

Most broadcasting transmissions used to work with analog signals, but recent technological advances have resulted in new digital signals. The broadcasting station or cable system sends out the digital signals for video and audio, and the televisions then receive, and convert the digital signals after decoding them to a visible image display and audio. The televisions use a system of scanning line by line to produce an image. The newest development in television broadcasting is the move to high definition (high resolution) broadcasting. HDTV sets receive these without a converted box. The video and audio are extremely clear and sharp.

A primary function of television, after basic communication, is to promote products and services through advertising. The advertisers pay for time on the air, and this helps offset the costs of broadcasting so the home viewers receive over the air programming without having to pay for it. With a cable or satellite system, the view pays a monthly fee to receive local stations and distant broadcasts, some with and some without commercials. Their signals are encrypted and the paying viewers are the only ones who can receive the signals. In some countries, the government controls television broadcasting, and in other countries, the broadcasting stations pay a license fee for the privilege. Government funded television is usually paid for by viewer taxation.

Television programming is offered in a variety of genres, including news, entertainment, talk shows, soap opera, game shows, documentary, and sports. A new development is the popularity of reality shows. Programming is produced by networks, and independent producers. Some programs are direct, and others are syndicated. Reruns of old shows are popular. Television is a social medium, and tends to affect society. Modern ecological concerns involve the use of metals and gases in televisions and their disposal.