Date: Sat, 21 Nov 2009 13:14:26 -0700 From: Brett Glass <brett@lariat.net> To: Dag-Erling Smørgrav <des@des.no>, spellberg_robert <emailrob@emailrob.com> Cc: "Person, Roderick" <personrp@UPMC.EDU>, fbsd_chat <freebsd-chat@freebsd.org> Subject: Re: lcd monitor manufacturer recommendation request Message-ID: <200911212014.NAA02010@lariat.net> In-Reply-To: <866393vekq.fsf@ds4.des.no> References: <200911200921.nAK9LKpf063202@lurza.secnetix.de> <4B06DD70.8030308@emailrob.com> <1AE59099C6D80E41BEB64A1768AFB4EA30ED5BAF@msxmbxnsprd18.acct.upmchs.net> <4B07451E.8020907@emailrob.com> <866393vekq.fsf@ds4.des.no>
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At 12:54 PM 11/21/2009, Dag-Erling Smørgrav wrote: >A CRT has an electrom beam that sweeps across the screen left to right >and top to bottom, and the horizontal and vertical sync frequencies >control how fast the beam moves. An LCD panel does not have an electron >beam; it has discrete, individually adressable pixels. If you insist on >hooking it up to an analog port, it will have to convert the analog >signal to a digital signal in order to display it, and you will get >sampling artifacts, aliasing etc. I don't care how good you are at >writing modelines; you will never come up with one that looks better >than what you will get with a digital connection. Unfortunately, some monitors with digital interfaces are not compatible with some LCD displays, even though the sockets and cables look like they match up. For example, I recently tried to hook an Asus "Eee Box", which has an HDMI connector, up to a Samsung LCD display using a digital cable. Couldn't get it to work at all, no matter how I adjusted the settings on both. But when I used an analog adapter and cable, it worked on the first try at maximum resolution, with (fortunately) few or no noticeable artifacts. Analog isn't ideal, but it's a good fallback. --Brett Glass
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