Linked by Hadrien Grasland on Sun 4th Sep 2011 12:39 UTC
Graphics, User Interfaces "Okay, it's been about one week and there are not much answers anymore, so it's time to thank everyone who participated, close this survey, and publish the results, along with some interpretation." Everything is released under Creative Commons CC0 license, so anyone interested, please help yourself.
Thread beginning with comment 488639
To view parent comment, click here.
To read all comments associated with this story, please click here.
RE: LED
by Neolander on Tue 6th Sep 2011 11:55 UTC in reply to "LED"
Neolander
Member since:
2010-03-08

Most stuff sold as a LED screen nowadays is just a LCD with a white LED backlight. More than 30% of the input energy still gets converted to heat in the most optimistic case of displaying a white image. I'd love to see OLEDs and reflective technologies everywhere, but we're not there yet.

Also, glare does not come from the LCD technology itself, but from manufacturers' choice to put a polished, shiny coating in front of the screen. I've heard that it makes sense for touchscreens and ensures truer color rendering, but I'm not convinced that the benefits outweight the costs.

Edited 2011-09-06 11:59 UTC

Reply Parent Score: 1

RE[2]: LED
by transputer_guy on Tue 6th Sep 2011 21:10 in reply to "RE: LED"
transputer_guy Member since:
2005-07-08

The Unipixel company in Texas had a TMOS panel based on a modified LCD LED structure. They replaced the LCD tricolor cell for a single Time Multiplexed Optical Switch and did RGB in time sequential mode. I had really great hopes for it since Samsung took a license in 09, but no word of it since.

Also they reported the classic LCD cell is less than 5% optically efficient so almost all the CFL or LED light source is turned into heat even for all white display. The TMOS cell is about 60% efficient so that would have been a huge power saver if it was used in tablets or laptops. Oh well, OLED might arrive one day.

Reply Parent Score: 2

RE[3]: LED
by Neolander on Wed 7th Sep 2011 07:14 in reply to "RE[2]: LED"
Neolander Member since:
2010-03-08

60% ? Impressive, I wonder how they achieve that. If they start from white light, isn't color filtering supposed to eat its share anyway, even if it's done sequentially ?

I mean, assuming that the Red, Green, Blue was a partition of the optical spectrum with equivalent energy to each color...
-When displaying red, green and blue have to be filtered out, so there go two thirds of the energy.
-When displaying green, red and blue have to be filtered out
-When displaying blue, red and green have to be filtered out

Or isn't it so ?

EDIT : Okay, according to this https://secure.wikimedia.org/wikipedia/en/wiki/Time-multiplexed_opti... , they don't start from white light, but have a light source that can intermittently emit red, green, and blue light instead.

How can such a source work ?

Edited 2011-09-07 07:21 UTC

Reply Parent Score: 1