Thinkpads Forum

penartur wrote: AFAIK LCD pixels work by blocking some portion of light, dependent of pixel state. E.g. black "closed" pixel may block 99% of backlight, and white pixel may block 30% of backlight, resulting in 70:1 contrast ratio. Thus, with backlight of power L, black color brightness will be 0.01L, and with backlight of power 2L, black color brightness will be 0.02L.
You can think of it as of tinted glass.

But wouldn't that assume that a black pixel blocks all frequencies equally, and that an increase in backlight power increases the output of the backlight evenly across the entire spectrum? I certainly believe the former, but I would be surprised if the latter were true.

Of course this is absolutely at the fringe of my LCD tech. knowledge. I know how to find the panels, how the read the spec sheets, tinker with the cables, and install 'em, but I can't say I've got anywhere close to a solid understanding of the mechanics of TN panels.

ThinkRob wrote:But wouldn't that assume that a black pixel blocks all frequencies equally, and that an increase in backlight power increases the output of the backlight evenly across the entire spectrum?

Because we're comparing different screens, there might be, just might be, some difference, but not that large, maybe a percent or so.