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You too can do KILLER vectors at 15khz!!
1UP:
--- Quote from: genesim on May 31, 2009, 06:35:33 pm ---1up do you realize what you are saying?
If black is more on the boarder then is on the film that doesn't mean SQUAT. Did the LCD suddenly not become an LCD on the corners? If it showing a deeper black...uh then it is showing a deeper black. Kind of kills the whole arguement that an LCD can't do it doesn't it?
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I know exactly what I'm saying, sorry you didn't get it. I'm saying that the black plastic frame of your TV is as black as you can get under the lighting in a given room, so it's a good comparison. If the black bars on a letterboxed movie look like a dark grey in comparision, then they aren't really that black, are they? But they should be, because there is no color value in those pixels, they should be an RGB value of 0,0,0.
--- Quote ---This is hard to keep up! What is the advantage of LED backlight?
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The advantage is obvious. Basically, a normal LCD screen is always white, uniformly lit by one big backlight, and the LCD pixels try to cover it up with colors. It's kind of like printing on paper, you're removing transmitted light by covering it with ink. This is why you can't get a true black, because there is always a blaring white light behind it all, and the LCD is always going to be slightly translucent. A screen lit by LEDs is lit on a pixel-by-pixel basis, much like a CRT screen. Only the pixels that are turned on are lit (actually, blocks of pixels as Randy points out below). So black areas are actually as black as they can be (taking room lighting into consideration) since NO LIGHT is coming from these pixels.
Makes sense?
Other advantages would be less heat, brighter whites, and a light source that doesn't burn out after just a few years. The screens also look to be about 1/3 as thick as current "flat panels". Depending on the LEDs used, you could even have a screen that's bright and clear even in direct sunlight. I'd like that kind of screen for my laptop,
RandyT:
--- Quote from: 1UP on June 01, 2009, 03:26:48 pm ---A screen lit by LEDs is lit on a pixel-by-pixel basis, much like a CRT screen. Only the pixels that are turned on are lit. So black areas are actually as black as they can be (taking room lighting into consideration) since NO LIGHT is coming from these pixels.
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Everything is correct but this last part is confusing. The LEDs are not small enough to have perfect pixel representation, so the lighting is based on groups of pixels. This is why I stated earlier that the drawback is "blooming" around small, bright objects because you have to illuminate the area of the pixels, rather than just the pixels. The blacks are so dead next to the illuminated parts, it's easier to notice it. Much like it's easier to notice the difference between black screen area and black plastic frames. But it should make vectors look pretty darn good.
RandyT
1UP:
Hehe, sounds even more like a CRT. :) My bad. But the basic concept is still that you're point-lighting rather than illuminating the whole screen at once. I'll have to get a look at one of these up close. I'll bet eventually we'll have LED-only screens or something similar, where the pixels are actually lit one by one.
genesim:
1up,
Sorry I misintrepeted what you said. I do see your point. I guess I don't see the raging difference. When I turn out the lights I don't see it.
Still there is some things on CRT that are also a problem with me.
Glare, color bleed etc..but one other point brought up.
This whole business about the shuttering effect of CRT being beneficial. There is a phenomenon called "glow" where the color doesn't go back to "black" because of the phospher that is hit by the electron having an after effect, so while LCD supposedly has blur(even though the 120hz refresh negates that), this part actually to me is even more troubling.
Kind of like turning off your regular television and seeing the obvious after glow. This is the nature of a CRT mechanism.
--- Quote ---I'll bet eventually we'll have LED-only screens or something similar, where the pixels are actually lit one by one.
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Ahhh and then a whole new set of debates will start. As it stands Liquid Crstal Displays are quite nice to my eyes and I guess I am pretty satisfied thus far. But it all makes me curious...
Most of the problems that people have are their displays are not calibrated correctly...the sources vary so much..etc.
genesim:
Incidently on my final point a Plasma already used similar technology of individual lit pixels except it uses a gas.
Doesn't a stagnate picture mechanism give way to screen burn in? I hear LCD's do it too...but not nearly as bad...and I hear not permanent.
But as it stands I don't know if I buy that a dissapating back light is really all that detrimental to a display as far as illuminating goes. I certaintly don't buy that you could actually see the difference in quality...it is still a back light on a LED, just a a more direct way.