DLP Projector

Cheap projector tips


Best choice for your cheap projector is DLP technology.

DLP® technology is the only display solution that enables projection systems to create a purely digital connection between a digital video or graphic source and the screen in front of you. While all other technologies are analog and compromise some image quality in translation, DLP® projection unleashes the full potential of the content you want to see-whether it's in a movie theatre, the office, or your own living room.



DLP® projection outshines analog technologies because it brings more light from lamp to screen. The Digital Micromirror Device at the heart of DLP® technology works more efficiently than the cathode ray tubes (CRT) and D-ILA systems found in many televisions. While these analog technologies tend to lose a certain amount of light in transit, DLP® projection's greater efficiency creates exceptional brightness that increases with resolution, and does not degrade over time.

In home entertainment systems, DLP® technology produces a stunning show that plasma televisions and CRT televisions cannot match. And in the office, the superior brightness of DLP® projection gives presentations maximum impact-even in rooms where ambient light is difficult or impossible to control.

Images and video displayed with DLP® projection's unique reflective technology appear seamless at any resolution. That's because the hundreds of thousands of mirrors making up the Digital Mirror Device in a DLP® projection system are spaced less than one micron apart, resulting in a 90% fill factor. Because the gaps between pixels are minimized, DLP® projection comes closer than any other technology to producing the exact mirror image of an incoming video or graphic signal.

The difference is easy to see. DLP Cinema® projects a crystal clear movie onto every inch of the screen, every time-eliminating the scratches, flutter and focus problems that come with film.

And the close spacing of the DMD mirrors means that presentations, videos and other projected images never have the pixilated or "screen door" effect apparent in LCD-projected images at higher resolutions.

DLP® projection systems are more reliable than the analog alternatives because, being digital, they are able to recreate their incoming video or graphic source material every time they project it. Unlike cathode ray tubes, which move out of alignment over time, or DILA systems, which are susceptible to distortion, or film, which inevitably ages, DLP® projection quality does not deteriorate with ongoing use. In other words, projection systems using DLP® technology enable you to see the creator's original vision at full impact again and again, no matter how many times a video or graphic has been projected.

LCD projector

Cheap projector tips

LCD is mean Liquid Crystal Display. LCD projectors send light from a halogen lamp through three LCD panels, the red, green, and blue components of the video signal to display an image. As light passes through the panels, individual pixels can be opened to allow light to pass or closed to block the light. The combination of open and closed pixels can produce a wide range of colors and shades in the projected image.

Halogen lamps are used because they output an ideal color temperature and a broad spectrum of color. These lamps also have the ability to produce an extremely large amount of light within a small area: current projectors average about 2,000-4,000 ANSI lumens.

LCD projectors tend to be smaller and more portable than other types of projection systems because its small halogen lamps and the ability to project an image on any flat surface. But the best image quality is found using a blank white or grey surface, so dedicated projection screens are often used.

Perceived color in a projected image is a factor of both projection surface and projector quality. Since white is more of a neutral color, white surfaces are best suited for natural color tones; as such, white projection surfaces are more common in most business and school presentation environments.

However, darkest black in a projected image is dependent on how dark the screen is. Because of this, some presenters and presentation space planners prefer gray screens, which create higher perceived contrast. The trade-off is that darker backgrounds can throw off color tones. Color problems can sometimes be adjusted through the projector settings, but may not be as accurate as they would on a white background.

Early LCD systems were used with existing overhead projectors. The LCD system did not have a light source of its own: it was built on a large "plate" that sat on top of the projector in place of the transparencies. This provided a stop-gap solution in the era when the computer was not yet the universal display medium, creating a market for LCD projectors before their current main use became popular.

This technology is employed in some sizes of rear projection television consoles, as there are cost advantages when employed in mid size sets (40 to 50 inch diagonal). This is not expected to have much longevity in the "home theater" marketplace due to expected improvements cost/performance of competing technologies, particularly in direct-view LCD panels at the lower range of sizes and DLP projection in the larger sizes.[verification needed] Another advantage of using this LCD projection system in large television sets is to allow better image quality as opposed to a single 60 inch television, although currently an equal of an LCD projector is the LG 100 inch LCD TV, still in prototype stages this TV is a huge advancement towards projector sized televisions. A common rule of thumb is that an LCD's image quality will decrease with a size increase. A workaround is to use a small lcd panel (or panels) and project them through a lens onto a rear projection screen to give a larger screensize (with a decreased contrast ratio) but without the quality loss.

In 2004 and 2005, LCD front projection has been enjoying a come-back because of the addition of the dynamic iris which has improved perceived contrast up to the levels of DLP.

The basic design of an LCD projector is frequently used by hobbyists who build their own DIY projection systems. The basic technique is to combine a high CRI HID lamp and ballast with a condenser and collector fresnel, an LCD removed from a common computer display and a triplet.