What is the difference between 10,000:1 dynamic ratio and 2,000:1 native ratio?

Question

My b/f recently purchased a 46" Sharp Aquos LCD TV. What is dynamic and what is native ratio? Is 10,000:1 dynamic good, and 2,000:1 good?? I'm LOST!!
Is this a good TV?

Answer 1

It's decent and good but not great. My 50" plasma TV has 20,000:1 native contrast ratio. Plasmas don't have dynamic contrast ratio. A notable recent development in the LCD technology is the so called "dynamic contrast" (DC). When there is a need to display a dark image, the display would underpower the backlight lamp (or decrease the aperture of the projector's lens using a shutter), but will proportionately amplify the transmission through the LCD panel. This gives the benefit of realizing the potential static contrast ratio of the LCD panel in dark scenes, when the image is watched in a dark room. The drawback is that if a dark scene does contain small areas of superbright light, they may be sacrificed and blown out.It is also common to market only the dynamic contrast ratio capability of a display (when it is better than its native contrast ratio), which should not be directly compared to the native contrast ratio. A plasma display with a native 5000:1 contrast ratio will show superior contrast to an LCD display with 5000:1 dynamic and 1000:1 native contrast ratio when the input signal contains full range of brightnesses from 0 to 100% simultaneously. The drawbacks of your LCD TV is poor black levels. Even though your LCD TV has great native contrast ratio (ex: 10,000:1 native and 50,000:1 dynamic), it still won't display the deepest blacks because it has backlight. It's not an issue on plasma TV. Another drawback is brightness, plasma has 5 to ten times more brightness than LCD which means you can still see the clear picture even on outside of your house. I believe sharp aquos has brightness of 450cd/m^2 but my plasma has 2500cd/m^2. That's why I chose Plasma over LCD. The plasma tv drawbacks is burn-in and low life span. Today's plasmas rarely encounters burn-in and has more life span than the 1st generations of Plasmas.

Answer 2

Just because I've seen the TV, yes, it's a damn good TV. Don't buy a television based on contrast ratio though. No two companies use the same method to measure contrast ratio, thus making it a flawed measurement. For example, Samsung can say that it has a 20,000:1 ratio while Sharp only has a 15,000:1 ratio. The 20K looks more impressive, but in actuality the Samsung could not be as good because they measure it a different way.

Also, numbers like Contrast ratio and sometimes response time are slightly fabricated to lure an uninformed consumer to buy their set.

Answer 3

The NATIVE ratio tells you how sensitive the liquid crystal is to subtle changes in voltage/current....2000:1 is pretty sensitive for starters...

The DYNAMIC ratio is the ability of the electronic circuitry to ENHANCE the native contrast ratio....it can actually increase the sensitivity by 5 times....5 x 2000 = 10,000

That's Damn good for a TV set....and I don't use those words too often.....

Answer 4

Contrast ratio is the ratio of white luminence over black luminence.

In LCDs, dynamic contrast takes into consideration the ability to change the backlight (Best white with backlight fully on over best black with backlight turned down)

In most TVs: Dynamic contrast = 5 x native contrast.

Answer 5

thats pretty good it just means that the pic will look better the higher the contrast . my tv is 15000:1

Answer 6

whiter white and the blacker black