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Author Topic: How does an LCD monitor work (with groovymame)  (Read 530 times)

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jimmer

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How does an LCD monitor work (with groovymame)
« on: January 10, 2018, 07:29:20 pm »
 
What does a typical (fast computer lcd monitor) do with the incoming vga signal ?

I'm hoping/assuming it lights up the pixels as fast as it can following the input signal. So the lag is of the order 7ms behind a crt.

????

Calamity

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Re: How does an LCD monitor work (with groovymame)
« Reply #1 on: January 11, 2018, 12:54:46 pm »
An LCD monitor uses a scaler to convert everything it's fed with to the panel's native resolution. This step takes time. Additionaly, if you fed it with an analog signal (VGA), it will need to do analog to digital conversion. That's more than 7ms.

The optimal situation of course is to always use the LCD's native resolution through a digital output. I believe that modern G-Sync/Free-Sync monitors should be able to start lighting the pixels as soon as the information is received without any buffering /processing.
Important note: posts reporting GM issues without a log will be IGNORED.
Steps to create a log:
 - From command line, run: groovymame.exe -v romname >romname.txt
 - Attach resulting romname.txt file to your post, instead or pasting it.

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