Date: Wed, 2 May 2007 11:05:53 +0200 From: "Victor Engmark" <victor.engmark@gmail.com> To: "Ted Mittelstaedt" <tedm@toybox.placo.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: How to find HorizSync / VertRefresh rates? Message-ID: <7d4f41f50705020205q24d452efpde5e4e1867d99864@mail.gmail.com> In-Reply-To: <BMEDLGAENEKCJFGODFOCCEAKCAAA.tedm@toybox.placo.com> References: <7d4f41f50705010028o319c543aj4c57f4e2edb9cf8d@mail.gmail.com> <BMEDLGAENEKCJFGODFOCCEAKCAAA.tedm@toybox.placo.com>
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On 5/2/07, Ted Mittelstaedt <tedm@toybox.placo.com> wrote: > > I feel the need to remind folks that the concept of refresh rates is > completely meaningless with LCD panels. Flatpanels do not have a single > scan gun that draws lines at a specific time and rate of speed across a > phosphor. Well, the rates are both related to the video card, not the display. I'm not sure how the card feeds the image to an LCD display, but I guess that would depend on the enforced horizontal sync and vertical refresh rates. In any case, it's useful to have these rates if I should ever have the need to attach the card to an external CRT display. The computer in the LCD panel takes the video input at a range of refresh > rates, and converts it to a bitmapped image that is fed to the display > crystals. You can use whatever horizontal and vertical refresh rates > you want, as long as they are in the table that the LCD panel's computer > can decode, the resulting output is the same. Even though LCD displays don't flicker, it's useful to set the refresh as high as the panel is able to display, to get smooth transitions. I also will remind people that the pixel counts as resolution on flatpanels > also have no meaning. A flat panel has a fixed natural resolution. Any > other resolution that you feed to it is either dithered up or dithered > down to match the actual resolution by the display computer in the flat > panel. > I'm well aware of that, but I would still like my video card and screen to perform to the best of their abilities, in order to display the biggest amount of data per second possible, without frying. Anything else is a waste of resources. -- Victor Engmark Quidquid latine dictum sit, altum videtur - What is said in Latin, sounds profound
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