Introduction to rear screens
For Digital Future | October 2, 2008
Today I open the door to a blog in this type of screen that I forgot to try. and that in future articles we will learn how and what is appropriate. And is that LCD flat screens Plasma i occupy pages and pages of the network and the press, but we must not forget the back-screen HDTV.
He has spent much of that time in the stores, seeing a back-screen, we were surprised by their large size and picture quality, although these do, with a very limited viewing angle.
The huge and outdated projection TVs using CRT tubes have virtually disappeared. CRT tubes have been replaced by a more compact and more digitally advanced. Today, DLP (Digital Light Processing) is the most common technology for televisions rear. In DLP projectors, the image is created by microscopic mirrors arranged in a matrix on a semiconductor chip, known as the Digital Micromirror Device (DMD). Each mirror represents a pixel on the projected image. The number of mirrors corresponds to the resolution of the projected image.
Each mirror generates a small image that corresponds to a pixel by what are called micro-displays. It seems strange word to describe micro-display televisions to 72 inches or more. Within each cone said micro-display, a light source (usually high-powered lamp or LEDs), one or more chips and an optical system to amplify the image that comes to the screen.
In terms of image in detail, color, contrast and movement are matched to the plasma and LCD.
Being unpopular, it might be better to talk about the reasons to consider acquiring a back-screen HDTV:
- As we have said before, the current projection televisions are much thinner and lighter than the old CRT tube TVs, and even some little wider than a flat screen television.
- DLP televisions produce bright and sharp images with a brightness distributed evenly across the screen. Contrast is also excellent thanks to its brightness and black level.
- DLP TVs do not use phosphorus coating of the screen, so there is no possibility of burning to keep the screen images can spend as much time in the plasma and to a lesser extent in the LCD.
- Rear projection TVs have a modern lamp life of up to 10,000 hours, so its brightness is maintained over time. If necessary you can replace its lighting system for about 150 euros usually happen with the model but not in the light of LED, which have a lifespan of about 60,000 hours.
- These screens provide images really big (150 ") for affordable prices. For example we can find models FULL HD 60 "by about 1500 euros.
But there are also disadvantages to this technology:
- The viewing angle is not as extensive as in flat panel displays, which are screens that have only one good quality if you look directly at the forefront of the screen.
- Some spectators could see the rainbow. Most models DLP creates a light color with a powerful lamp and then sends the light of another color so the colors are projected sequentially rather than all at once, and that's why some people may occasionally see "Rainbow" (multicolored brief flashes of light). Most people never see the rainbow, but the viewers who are sensitive to them should consider a DLP display with LED lighting. This effect occurs in only 1 chip models of color but there are models with 3 chips (one for each of the 3 primary colors) so we sent all the colors simultaneously and thus remove this effect. The problem is that they are considerably more expensive models to mitigate the effect that a few people are sensitive.
- Lamp-based screens require any replacement sooner than expected valued at 150 euros, but the models LED lasts for the lifetime of the display.
Mitsubishi is one of the manufacturers with more innovations in display technology. In this link you can see the models.
Topics: TV |
- The technology screens Rear
- Properties of elements and rear screens
- Buy a TV screen (II)
- The plasma screens during the same as the LCD
- Solutions for the memory effect on television screens
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