In alt.tv.tech.hdtv Alan wrote: | In article "HD Freak" writes: |> Samsung claims it has the largest 70 inch Full-HD LCD TV in the world |>commercially available. |>
|> The F9 Full HD LED LCD TV features the latest advanced technologies |>including Samsung's LED SmartLighting, which intuitively senses the TV |>signal and adjusts brightness by modulating the right combination of LED |>backlight units which produces a dynamic contrast rating of 500,000:1. | | | And, based on the Sharp implementation of the same idea, the first | thing you will do is turn it off. | | It seems to be a terrible idea, as the backlight needs to change when a | part of the picture changes from bright to dark. The other parts of the | picture that don't change will vary in brightness with this backlight | change.
Does the whole backlight change? Or could it be they have a backlight that is segmented into regions that can change brightness independently? Even if it is one whole backlight, all it needs to do is track the pixel that is brightest. In dark scenes, the brightest pixel usually is more dark than in bright scenes. If the change in backlight level and the pixel levels change in sync and follow the same linearity, you should not see it. The problems come when a scene has more contrast ratio than the base contrast ratio of the display under a fixed backlight level.
| These are not HD news - these are press releases from the company's | marketing department.
And certainly not technical product reviews.