Build Your Own Arcade Controls Forum

Software Support => GroovyMAME => Topic started by: jimmer on January 10, 2018, 07:29:20 pm

Title: How does an LCD monitor work (with groovymame)
Post by: jimmer 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.

????

Title: Re: How does an LCD monitor work (with groovymame)
Post by: Calamity 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.