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Why Do DLP Television Sets Appear Brighter Than Projection HDTV Sets?
Because the DMD (Digital Micro Device) is a reflective device, it has a light efficiency of greater than 60%, making DLP™ systems more efficient than LCD projection displays. This efficiency is the product of reflectivity; fill factor, diffraction efficiency, and actual mirror "on" time.
LCDs are polarization-dependent, so one of the polarized light components is not used. This means that 50% of the lamp light never even gets to the LCD because it is filtered out by a polarizer. Other light is blocked by the transistors, gate, and source lines in the LCD cell. In addition to these light losses, the liquid crystal material itself absorbs a portion of the light. The result is that only a small amount of the incident light is transmitted through the LCD panel and onto the screen. Recently, LCDs have experienced advances in apertures and light transmission, but their performance is still limited because of their dependence on polarized light.
Seamless Picture Advantage
The square mirrors on DMD's are 16 µm˛, separated by 1 µm gaps, giving a fill factor of up to 90%. In other words, 90% of the pixel/mirror area can actively reflect light to create a projected image. Pixel size and gap uniformity are maintained over the entire array and are independent of resolution. LCDs have, at best, a 70% fill factor. The higher DMD™ fill factor gives a higher perceived resolution, and this, combined with the progressive scanning, creates a projected image that is much more natural and lifelike than conventional projection displays.
A leading video graphics adapter (VGA) LCD projector was used to project the image of the parrot shown below, the pixelated, screen-door effect common to LCD projectors can be easily seen.
The same image of the parrot was projected using a DLP™ projector and is displayed in the right image. Because of the high fill factor of DLP™, the screen-door effect is gone. What is seen is a digitally projected image made up of square pixels of information. With DLP, the human eye sees more visual information and perceives higher resolution, although, as demonstrated, the actual resolution shown in both projected images is the same.
DLP TV Buying Information and Background InformationDLP Reviews and Internet Links
- NEW: How to buy a DLP Television in 8 Easy Steps
- DLP TV vs LCD TVs
- DLP TV vs Plasma TVs
- Where should you go to buy your DLP TV?
- The Invention & Background of Digital Light Processing - DLP
- How Digital Light Processing (DLP) Technology Works
- Estimated Life Span of a DLP Television
- DLP TV Brightness Levels
- DLP Technology and PC Connectivity
- Selecting the correct DLP TV Screen Size
- View the current selection of DLP TV Models
How to buy a DLP Television in 8 Easy Steps DLP TV and Rear Projection HDTV Reviews Find Authorized DLP and Projection TV Dealers
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