Vision Pro LCD questions

[Epyx]

I have searched the forum but haven't found answers to a few questions I have regarding:

http://www.happcontrols.com/monitors/49260310.htm

I am confused on how an LCD with its set pixel count runs the lower 15khz resolutions? Does it double the pixels and scale up just like a regular lcd monitor would?

Anyone?

[Epyx]

To clarify...what I am asking is what is the difference between this monitor and a regular store bought LCD monitor?

[Ummon]

It has built-in scale conversion.

[Rickn]

This sounds like the same question I got on a voice mail I just picked up off the phone at the shop?? Gordon is this you???

Here is a brief expalnation....

First off the main comonents of an LCD:
- Power supply, sometimes an individual board inside the back of the LCD, sometimes what looks like an AC adapter. Typically 12 volts.
- An invereter, this takes the 12 volts and is basically a switch mode supply that ups the voltage to around 1300 volts or so to light the back light bulbs in the LCD panel.
- A/D Board... analogue to digital converter. This is sort of the heart of the LCD. LCD panels are actually digital devices where as each individual pixel is addressed and lit digitally. In other words a signal woould be sent to vertical line # and pixel X to light the stripe using a twisted film transsitor to excite and light the stripe. Many signals like standard res (CGA) mid-res(ega) are analogue. So the A/D convers that analogue signal to a digital signal that addresses the right pixel to light.
Here is the heart of the original question.... normal / traditional LCD's operate at 31Khz (VGA) or higher. They do not do the traditional Arcade resolutions.
I have tested many, many A/D boards claiming to support all arcade resolutions.... most of the time not so. My LCD line has only had one game that it had a problem with (Robotron) which had a bit of a noisety picture, pretty sure it was a game issue.

Next main component is the LCD panel it self, it has the backlight bulbs and other support. The panel may be a 1024X768, 800X600 or other. That is where the A/D board must be programmed to match the panel. Likewise different operating voltage of each panel.Want to see something interesting, if you have access to a 10X or 15X microscope ror jewellers lupe, look at the screen of a picture tube, you will see Red, Green and blue stripes, now look at the LCD screen.

Guess what, same stripes.

Not sure that this helps with the question, but don't hesitate to ask.

BTW the happ is overpriced.I can do better.

Rick2Niemandisplays.com
www.niemandisplays.com

[Epyx]

Thanks Rick. Yes, that would be me

I ended up going with a Wells Gardner D9800. I was looking at your monitors and as a fellow Canadian definitely was interested but I wanted the digital sync for 15/25/31 games as I will be switching between them a lot (and windows games at 640x480/800x600). I understand your reason for not making these (the programming etc) but really wish you had this in your line.