Main > Main Forum
Do LED monitors really look this crappy with mame?
RandyT:
--- Quote from: BadMouth on February 28, 2014, 02:52:43 pm ---Kinda made me wonder if an LCD could be made that drew the picture in the same order to simulate a CRT though.
It's not feasible with current protocols, but I wonder if it's technically possible.
--- End quote ---
It's not technically possible. LCD's are ultimately limited by the speed in which the crystals can change orientation in the suspension medium. Even if you could coax an LCD into this behavior, you would need one with a refresh rate of (FPS x the number of physical pixels on the screen) x 2. For a 1920x1080 screen at 60hz, this would mean that the screen refresh rate would need to be 248.8mhz. Well beyond the common 120hz refresh rates and 6ms response times of LCD panels.
The only reason this works with a CRT is that only a single dot of light is ever on the screen at any given moment in time. Only the lightgun can sense the exact moment when that single dot passes in front of it's sensor, while persistence of vision, coupled with a small amount of phosphor persistence, allows humans to see a complete image.
RandyT:
--- Quote from: jadder on February 28, 2014, 12:15:07 pm ---something like the pic below is what id like to see being done on lcd's
it must be possible, as u are looking at it using your lcd screen right now ;)
--- End quote ---
The problem is that you are showing a magnified section of the screen. That image of 1/4 of the screen has a resolution of 1024x768, and still doesn't capture all of the detail of the original. So to effectively represent a full screen at that same quality, you would need a monitor with a native resolution of ~2048x1536, which is still higher than "Full HD", and then have the complex algorithms, computing and graphics horsepower to effectively duplicate it. That's why I indicated that the 4k displays, with those same computing requirements, would have the best chance of doing this accurately.