Why are most LCD's limited to 60hz?

Shocky-FM · 30 Jul 2006 at 13:06

Now I understand that the refresh rate doesnt really apply to LCD's in the same way but why are they limited to 60hz, especially the larger panels..

One of the major annoyances of the larger 20"+ LCD's is image tearing which which be hugely reduced if they just increased it to 75hz. So the question really is why ?

Jokester · 30 Jul 2006 at 13:14

To get 75Hz would need a total response time of about 12ms or less. Some monitors do do that, but the response times they quote aren't absolute response but something like grey to grey I think it's called so the true response will likely be more.

Jokester

Shocky-FM · 30 Jul 2006 at 13:21

So the refresh is directly linked to the responce time?

For example on a 2407/244T which I believe are 6ms g2g and 12ms overall.. would you be able to force a higher refresh rate at 1920*1200 ?

Baddass · 30 Jul 2006 at 13:25

it's not directly linked to response time, no. The refresh rate of a TFT is "optimum" at 60Hz and all manufacturers recommend you run the screen at this refresh rate. However, the "maximum" refresh rate is often 75Hz and if you really wanted to you, could run it at this instead. If tearing is a problem then vsync is normally the answer. I can appreciate some people then find the limit of 60fps a problem, but with other modern technologies like tripple buffering, this isn't as much of an issue.

Shocky-FM · 30 Jul 2006 at 13:27

Baddass said:
it's not directly linked to response time, no. The refresh rate of a TFT is "optimum" at 60Hz and all manufacturers recommend you run the screen at this refresh rate. However, the "maximum" refresh rate is often 75Hz and if you really wanted to you, could run it at this instead. If tearing is a problem then vsync is normally the answer. I can appreciate some people then find the limit of 60fps a problem, but with other modern technologies like tripple buffering, this isn't as much of an issue.

vsync is a major problem for gamers, not only does it half your framerate but also causes lots of input lag and that only increases with tripple buffering.

Baddass · 30 Jul 2006 at 13:30

fair enough. Then you can often run a TFT up to 75Hz if you wanted to, but they aren't running optimally if you do. In fact modern RTC (overdrive) enabled panels often suffer as a consequence with the overdrive application being adversely effected, and response time therefore being reduced. If you're a serious gamer and things like vsync being on bother you, perhaps a CRT would be more suited to your needs overall.

Shocky-FM · 30 Jul 2006 at 13:34

Baddass said:
fair enough. Then you can often run a TFT up to 75Hz if you wanted to, but they aren't running optimally if you do. In fact modern RTC (overdrive) enabled panels often suffer as a consequence with the overdrive application being adversely effected, and response time therefore being reduced. If you're a serious gamer and things like vsync being on bother you, perhaps a CRT would be more suited to your needs overall.

Well on my VX922 at least increasing to 75hz doesnt have any noticable side effects but then again I think it does actually support 75hz so i'm not sure if the larger panels would be the same if forced.

Baddass · 30 Jul 2006 at 13:36

most modern TFT's will support 75Hz as a maximum, sometimes you may need to "force" it through software due to a WinXP restriction over DVI, but the screens can support it if you check the manufacturers data sheet for the models. You should be fine running at 75Hz but overdrive may be affected on some models

Shocky-FM · 30 Jul 2006 at 14:22

Baddass said:
most modern TFT's will support 75Hz as a maximum, sometimes you may need to "force" it through software due to a WinXP restriction over DVI, but the screens can support it if you check the manufacturers data sheet for the models. You should be fine running at 75Hz but overdrive may be affected on some models

hmm, I'll have to try it later on one of the 2407 i've still got... I've still got two which dell were ment to pickup over a week ago.. There great at getting replacements to you but useless at collecting them..