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Pentium
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| There is alot of talk at the mo about LCD monitors, whos back lights are LED's apparently enabling the monitor to produce something like true black. Ive been browsing through e-tailers and none of them list what kinda back light they use. Or am I missing something obvious. Thanks in advance.
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Pentium
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Pentium
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| well apparently led lcd tfts got invented back in 2005 ish so its been 3 years for them to have easily infultrated the market. Hmmm?
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Pentium
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There are a few backlit LCD's which are much thinner and don't use anywhere near as much power.
I don't think they are the same technology as OLED screens but I think they do use some kind of OLED (presumably to make the blue component of white).
(Sony Tri-colour (pdf))
LED screens are another thing entirely and they are still £1000 for 17" at 1/2 full HD
Youtube OLED screen
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Pentium
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Philips are taking a different approach to increasing the contrast ratio by using HCFLs (hot cathode fluorescent displays) which can be switched on and off at sub-microsecond speeds. With careful timing control, the lamps can all be modulated in-sync with the screen being scanned. It's still not as good as individual LEDs, but it's ten times better than what a lot of sets manage now in terms of convincing dynamic contrast enhancement.
Most other LCD TVs still rely very heavily on just modulating the back-light brightness with a response time of tens of milliseconds and they all look very false to me. To those who remember, it's like watching a CRT TV with a badly sagging HT. It basically looks "broken". I specifically chose an LCD TV/monitor without any form of dynamic contrast enhancement as you can't always fully disable it on the TVs that have it. At least my genuine 1500:1 can reproduce everything between its limits linearly. It just looks so much more natural to my eyes.
Individual pixel control for back-lighting is the only way to actually make it work properly. Anything else is a bluff and a compromise.
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Pentium
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Hi Teafie
Organic LEDs (OLEDs) already have, but only in small panels on small devices. The larger panels are still costly to make, whilst HD production and consumer demand is for ever larger, even more expensive panels. It'll probably cost about twenty billion to set up the first large scale OLED production plant. Given their interest, it'll probably be a South Korean or even a Chinese plant. The large demonstration panels have so far been produced at great cost in small-scale production plants, suffering from yield problems. Give it another five years before LCDs are more widely replaced by OLEDs ? 
Edit PS - cheap really large displays will probably be photo-chromic, looking like matt pictures and relying on incident light, but like fusion power, I probably won't be around to see it. 
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Pentium
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Ah, I see the point of LED backlights.
A normal white backlight is made up of all the colours of the rainbow so when the 'red' element of the LCD allows light to pass through it actually allows many shades of red to pass through.
If you backlight is made of LEDs then generally, only 3 specific frequencies are produced (i.e. one for red, one green and one blue). If this is tuned to the optimum light transmition frequency of the LCD then you get a greater contrast and more accurate colour.
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Pentium
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As with current CCFL back-lit displays, that would have the problem of still needing a colour filter matrix on the front of the display. If you make every single pixel capable of being R, G and B, you have a much higher perceived colour resolution than having to light up groups of R, G and B pixels.
Concentrate the power of a tri-colour LED down a hole 1 pixel square and you have a phenomenal potential in terms of CD/metre squared. They'd need a lot of cooling at that brightness though.
I think that's why the 800x600 res on a DLP projector actually looks surprisingly good. Each display pixel is displaying the entire R, G and B signal, so an entire screen of, say, red is possible rather than only one-third of it with individual primary coloured pixels.
Cheers, Slipstreem.
System specs: "Phoenix" - Intel C2D E4500 overclocked to 3GHz with ACF7Pro HSF on Volt-modded ASRock 775Dual-VSTA mobo (modded BIOS rev 3.10A and VNB=1.65, Vagp=1.8), 2x1GB Crucial Ballistix DDR2-800 RAM (3.0,3,3,8,1T @546MHz), Sapphire ATI HD3870 512MB GDDR4 PCIe graphics card overclocked to 850MHz GPU & 2.4GHz RAM. Powered by Hiper Type-M 580W PSU. Guess who likes overclocking on a budget.
MP3 Encoding for Audiophiles
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MPEG-4 Playback Enhancement Using FFDShow
How good is the Arctic Cooling Freezer 7 Pro HSF really?
Boosting ATI Framerates with CCC (X700 on)
Optimise ATI Image Quality And Framerates With ATT (X1XXX Series under WinXP)
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