Image Audio Visual Solutions - Types of Displays | LCD Displays & TVs | Plasma Displays & TVs | LCD & TFT Monitors | CRT TVs & Monitors | CRT Projectors | RGB | 3 Chip DLP | Texas Instruments DLP | Projectors Data & Video

LCD projection technology is the current leader of the pack, having captured the majority of the market share of all projectors sold. Most LCD projectors have three panels. Each panel is a prism that allows blue, red, or green light through its pixels. These separate colors are then converged and projected. Electrical signals turn on pixels within a set based on the resolution of the unit.

LCDs are known to produce greater color definition, offering more shades or variations of color than single-chip DLP™ projectors. DLP™ projectors can sometimes burn definition out of the highlights and shadows with their vibrant colors. Newer LCD projectors include special optics enhancers like micro-lens array that minimize pixelization known as the "screen door effect." New LCD projectors have contrast ratios as high as 800:1.

By comparison, DLP™ projectors contrast ratios are as high as 3000:1. The portability and brightness of LCD projectors have made them a popular choice for traveling presenters. The lightest LCD projectors weigh-in at about 4 lbs.

DLP™ (single chip) - Digital Light Processing

The single-chip DLP™ is the most portable of all our players. Currently you can find single-chip DLP™ projectors that weigh less than 2 pounds. Digital Light Processing is the product of the great minds at Texas Instruments. DLP™ uses a single Digital Mirror Device (DMD) chip that has thousands of tiny mirrors, each representing a single pixel. These mirrors tilt back and forth and deflect light as indicated by the source to create the image.

One limitation of DLP™ technology thus far is brightness. Currently most of the brightest single-chip DLP™ projectors on the market are just 3,000 lumens compared to the 6,000+ lumens of comparably priced LCD's and three-chip DLP™ projectors. Brighter single chip DLP™ projectors are available, but are significantly more expensive. However, because of their deep, rich blacks and high contrast ratios, LP™ projectors have been a popular choice among home theater enthusiasts.

The three-chip DLP™ has the best looking images of all the players. The three-chip system is much like the single-chip DLP™ only better. The image quality of the three-chip DLP™ is unsurpassed. Unfortunately it is also the most expensive. Unlike CRTs and single-chip DLP™ projectors, three-chip DLP™ can have very high lumen output levels.

This is the largest and most experienced player. Many of you have probably seen this kind of projector at a sports bar or in an auditorium at a school. CRT utilizes three tubes, sometimes called 'guns.' The three colors combine or converge to make your image. CRTs do not have a fixed number of pixels, making them versatile machines capable of clear images from higher or lower resolution sources. CRTs also require periodic 'calibration' by a trained professional, which can mean additional expense for the end user down the road. These projectors are generally used in fixed installations because of their size. CRTs are typically not as bright as the other technologies, but the refined picture quality of a properly calibrated CRT is tough to beat.

Arguably our 'coolest' player is the Plasma display panel. It is much thinner than other direct view display devices (i.e. TV), making it easy to mount to a wall without interrupting the flow of a room. From a technical perspective, a plasma screen is basically a direct view of thousands of pixels (made of glass bubbles) filled with Xenon gas in a plasma state. Inside each bubble are three cavities, one blue, one red and one green. Each bubble is hooked up to an electrical current. That current is then triggered by information from your input device. Since you are looking directly at the source of the image (the bubbles) you get a vivid and rich color. Plasmas are cool, but are not inexpensive. Watch for plasma prices to drop, making them a great choice for direct view televisions.

Your old TV has some new competition -- innovative new Liquid Crystal Display (LCD) flat panel televisions. Like popular LCD monitors you commonly see used with computers, LCD TV's have a slim design and a flat viewing surface, but have been fine tuned for video display. Recent advances in flat panel LCD technology now allow for larger screens, wider viewing angles, and higher-quality video images. LCD TV's are also competition for trendy-but-heavy, plasma display technology. They are several times lighter than comparably sized plasmas, and are far more durable.

How do LCD TV's work? Two sheets of polarized transparent material, one with a special polymer coating that holds liquid crystals, are adhered together. Electric current is passed through individual crystals, which interpret the information from the broadcast signal to allow or disallow light through them to create the specified image. The crystals themselves do not produce light, so the technology is non-emissive and therefore does not give off radiation like an older TV does. Florouescent tubes housed behind the transparent material are used to illuminate the image, so they require less power to operate than CRT televisions and plasma displays.