Finally, LEDs coming to market.
- Thread starter VIAN
- Start date
Sounds good, but it seems to be limited to laptop LCDs for the moment.
Why on earth would anyone want it that bright?
Why on earth would anyone want it that bright?
They're probably referring to the backlight's brightness, as opposed to the overall screen brightness.
Backlights are actually very, very bright. It's just that only a small amount of light makes it through the LCD portion of the screen.
For example, surrounding the actual liquid crystal part are two polarizers, one at each end. The first polarizer knocks off 50% of the light right at the beginning, while the second polarizer absorbs anywhere from 0% to 100%, depending on whether the screen is white or black.
Also, an LCD screen is made up of 1/3 red, 1/3 green, 1/3 blue. If this pixel is red, that means that the green and blue light is filtered out. In other words, at any point in the display, only 1/3 of the light is getting through the color filter part of the LCD screen.
Another factor to consider is the aperture ratio. Each pixel is surrounded by wires controlling that pixel, which are opaque. This means that only say 75% of the light gets through the array part (the part that's controlling the pixels).
Putting all these together, this is 1/2 * 1/3 * 3/4 = 1/8 of the brightness of the backlight is getting through. This is assuming 100% efficiency, and assuming the screen you're looking at is all white. Actually efficiency is far from this, and people don't buy notebooks to stare at white screens, so altogether a very very bright backlight is needed to jam enough photons through that LCD layer to make only a miniscule amount of light that you see.
Backlights are actually very, very bright. It's just that only a small amount of light makes it through the LCD portion of the screen.
For example, surrounding the actual liquid crystal part are two polarizers, one at each end. The first polarizer knocks off 50% of the light right at the beginning, while the second polarizer absorbs anywhere from 0% to 100%, depending on whether the screen is white or black.
Also, an LCD screen is made up of 1/3 red, 1/3 green, 1/3 blue. If this pixel is red, that means that the green and blue light is filtered out. In other words, at any point in the display, only 1/3 of the light is getting through the color filter part of the LCD screen.
Another factor to consider is the aperture ratio. Each pixel is surrounded by wires controlling that pixel, which are opaque. This means that only say 75% of the light gets through the array part (the part that's controlling the pixels).
Putting all these together, this is 1/2 * 1/3 * 3/4 = 1/8 of the brightness of the backlight is getting through. This is assuming 100% efficiency, and assuming the screen you're looking at is all white. Actually efficiency is far from this, and people don't buy notebooks to stare at white screens, so altogether a very very bright backlight is needed to jam enough photons through that LCD layer to make only a miniscule amount of light that you see.
AU Optronics is releasing some desktop LCD monitors with the LED backlights (and a new panel technology along with it).
More information: http://www.tftcentral.co.uk/news.htm#a-mva
Most LED backlights will come in a red+green+blue config to create a white light. The gamma settings will now adjust the backlight's color components instead of how much the matrix cells are blocking. For example, red at 50% will now yield a reduction in the backlight's red component instead of a lower red subpixel throughput. This allows maximum gamut at all times and more precise adjustment. Speaking of which, these LCDs will feature an 8-bit color depth and reach 92% gamut. This will make them lose some color precision, but that may be half compensated by the fact that the whole 256 levels of brightness will always be intact (backlight adjustment not matrix adjustment).
More information: http://www.tftcentral.co.uk/news.htm#a-mva
Most LED backlights will come in a red+green+blue config to create a white light. The gamma settings will now adjust the backlight's color components instead of how much the matrix cells are blocking. For example, red at 50% will now yield a reduction in the backlight's red component instead of a lower red subpixel throughput. This allows maximum gamut at all times and more precise adjustment. Speaking of which, these LCDs will feature an 8-bit color depth and reach 92% gamut. This will make them lose some color precision, but that may be half compensated by the fact that the whole 256 levels of brightness will always be intact (backlight adjustment not matrix adjustment).
I've been ready for LED for some time now. But unfourtunately, it doesn't look like it will make it in desktop LCDs by the time I'm in the market come Feb.
Nelsieus
Nelsieus
i thought OLED's were the next big thing. especially for energy saving portable electronics.
http://en.wikipedia.org/wiki/OLED
http://en.wikipedia.org/wiki/OLED
VirtualLarry
No Lifer
- Aug 25, 2001
- 56,575
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So why are LED backlights better exactly? Brighter? Most of the LCDs that I've seen, I would have to turn down the brightness to be able to use them for any length of time.
I think they are still having trouble with blue LED longevity, and that is delaying the introduction of larger OLED screens.
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