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Display resolution WAS: Questions from a newbie

From: "Tony Havelka" <>
Date: Wed, 28 May 2003 10:33:05 -0500

> The display looks reasonably good, but consider that 640x480 
> "requires" 307,200 pixels which is approximately 70,000 more 
> pixels than that display has.  

Don't fall into this trap, a VGA panel actually has 230,400 more pixels!

640x480 = 307,200 full color, individually addressable, pixels this
translates into 921,600 RGB Dots.

The resolution is incorrectly quoted on the web page as 230,000 pixels
when it should be 230,400 dots - but even that is technically incorrect.

It looks like they are using the Kopin 320C as the image source in this
product.   The resolution of this panel is 320x240 individually
addressable MONOCHROME pixels. This equates to 76,800 pixels or 1/4 VGA.

The display system utilizes a field sequential color scheme in order to
make it look like a color system - the backlight flashes red, green and
blue 120 times per second and the screen displays the respective red,
green and blue images at the right time. Retinal retention makes the
whole thing look like a crisp full color image. Each monochrome pixel
can also be counted as a full color pixel since it can be individually
addressed and the color is temporally modulated quick enough to be
imperceptible. Therefore, this HMD only has 76,800 full color,
individually addressable, pixels which is equal to Quarter VGA
resolution.

Companies like to quote dots as it gives them 3x the resolution - on
paper.  Dots are misleading as you cannot individually address just the
red dot or the blue dot or the green dot - you can only address them as
a group. This group is called a full color picture element or pixel. A
dot is just a dot.

-Tony

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