Homework help. Is there a better option than plasma or LCD tvs for the environment?
I have to write an essay comparing plasma tvs and lcd tvs and their effect on the environment. i also have to write about whether there is a better option than either of those two. If you know of anything that uses less energy or produces less greenhouse gases please share and maybe give me a link.
I found something about SED displays but there isn't much info on them. Anything is appreciated!
Best answer:
Answer by Barb E. Dahl
Yes. The best option is waiting until a book is written on the movie/show and after reading the book, recycle it or donate for someone else to read.
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In general, an LCD screen will use slightly less power than a comparably sized plasma screen.
Don’t worry about SED, it’s very much like OLED, both are not mass market products where TVs are concerned. So while you might find some info on them, it would mean nothing since there are no SED or OLED TVs in homes. Sony did sell a little 11 inch OLED TV, it’s not even HD and it cost like 2 thousand when it came out, I don’t count that TV, that was Sony just putting their toe in the water.
I’d focus on what’s out there. The major types of TVs are LCD with the majority being back-lit with CCFL lights, LCD TVs with LEDs (two types, edge lit and local dimming) and Plasma TV. The newer 2010 model plasmas are not plasma but NeoPDP panels, a kind of next generation panel with deeper blacks, brighter whites all while using less power. Also still fairly popular are DLP projection TVs. The majority of them use some kind of lamp like Xenon for example. So far, inch for inch, the smallest power user is Mitsubishi’s LaserVue TV that uses a red, blue and green laser instead of bulbs for the light.
When they demonstrated the LaserVue set which was 65 inches, the power usage was shown in real time, it was in moving around between 90 and 110 watts, which is amazing. While the set is expensive, and rare, it actually has shipped and it is in homes unlike SED and OLED. http://www.mitsubishi-tv.com/laser.html
The next part of your essay might cover what’s actually used to make the TV sets, but that might be more difficult. While TV makers like to brag that their sets are green because they beat the energy star ratings, and in some cases by a large margin, they don’t always go into detail when it comes to what’s in the set. Sure they sometimes say they don’t use mercury, or that a slimmer, lighter set uses fewer materials, but the details on exactly what’s inside are usually just not there.
For example. a large plasma TV will have a glass screen on the front, an LCD will use plastic. I’m thinking the glass is better for the environment, but it’s never mentioned.
So energy usage is all you really have to go on and understand that new 2010 models are close when you look at the numbers versus back in 2004 when the difference between LCD and plasma were huge. So the most efficient panels per square inch that are actually in stores and sell in large numbers would be LCD TVs that use LEDs in a ‘local dimming’ configuration. What that means is the set can have hundreds of small LEDs for the back lights, and right in front of that is a diffuser to even the light. In dark areas of the screen, the LEDs in that area can dim or turn off completely.
Next up would be LCD TVs with LED back lights in and edge lit configuration. LEDs take up less power than CCFL back lights, but because they are all always on, they use slightly more power than local dimming sets. After that it would be LCD TVs with the common CCFL back lights, and then plasma would be at the bottom.
It’s harder for me to figure out DLP projection sets, they make use of 2 kinds of high energy bulbs and Samsung made an LED version, but I don’t see those for sale anymore. Even though these sets are not as large as old projection sets, they are larger than flat panel TVs and need more materials and more packing and cardboard.
If OLED TVs were here, they’d probably be the champ for power usage, but a large OLED TV is probably years away. SED, well the image quality is nice from the prototypes shown at the big electronics shows, but power figures I don’t recall seeing those.
If you want to see actual power usage in watts and $ $ to use per month, go to http://www.crutchfield.com/ look at the various types of LCD TVs, plasma and DLP to get some real numbers.