dealing with display nonuniformity (mainly CRT). - AVS Forum
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post #1 of 4 Old 06-26-2014, 02:52 PM - Thread Starter
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dealing with display nonuniformity (mainly CRT).

Different displays have varying degrees of chromatic and luminance uniformity as a function of spatial position on the screen.

Given this reality, if we want to profile and calibrate our display using only one position on the screen, it makes intuitive sense to choose the center of the screen.

However, if it turns out that the spatial distribution of chromatic/luminance deviations from the mean is itself nonuniform, then perhaps it would be better to choose a different position.

For example, if it turns out that a small patch in the center of the display is consistently different from the entire remaining portion of the display, perhaps it would be better to measure at a non center position, as the center position in this case is a poor characterization of the display as a whole.

Does anyone know what typical uniformity distributions are like for CRTs (or for other display technologies), and do you think that this should be taken into account when deciding which patch of the screen to choose?
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post #2 of 4 Old 06-26-2014, 03:20 PM
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Originally Posted by spacediver View Post
Does anyone know what typical uniformity distributions are like for CRTs (or for other display technologies), and do you think that this should be taken into account when deciding which patch of the screen to choose?
With CRTs I'd imagine the center as the electron gun would have the easiest time steering the electrons to it.

Projection: center due to optics.
Back-lit: depends on the back lighting tech.
Plasma & OLED: The entire screen.
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post #3 of 4 Old 06-26-2014, 03:56 PM
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How about putting you meters on a tripod and setting them a foot away then you will measure a larger area of the screen minimizing the errors. This has it's own issues with OSM and room lighting but would probably be a simple solution.. after all you don't just look at a 3MM spot on the TV. :-)
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post #4 of 4 Old 06-26-2014, 04:07 PM - Thread Starter
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Originally Posted by airscapes View Post
How about putting you meters on a tripod and setting them a foot away then you will measure a larger area of the screen minimizing the errors. This has it's own issues with OSM and room lighting but would probably be a simple solution.. after all you don't just look at a 3MM spot on the TV. :-)
That's a great suggestion actually, integrating the entire screen. Would it work with a DTP-94? What about an i1d3? I had always assumed those meters only work in contact mode.
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