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Topic: [DISPLAY OPTION] [SCREEN SETTING] [SCREEN FORMAT]
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PT-RZ21K - Does altering the aspect ratio in [SCREEN FORMAT] to 16:9 give you a 16:9 Grid test pattern to line up with?
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This is a great question that manufacturers are often not good about having solid information about.

I believe, that you want to go into the SCREEN SETTING of the menu. This is referenced on page 117 of the owner's manual...
https://www.projectorcentral.com/pdf/projector_manual_10222.pdf

From that page, you would set your screen to being a 16:9 aspect ratio.

This is DIFFERENT than the aspect ratio control of the projector itself.

Aspect ratio should change the format of what is coming into the projector to adjust to the screen setting that you have told it to use.

The screen setting should be (should!) setup to match the screen you have in the space.

Once you've set your screen to be 16:10, 16:9, or 4:3, to match what you own, then all test patterns and images should ONLY fill the aspect ratio you listed.

That said, this requires a lot of forethought by the design/engineering/programming team. Panasonic tends to be very good at this, but it is hard to know if they preloaded the proper 16:9 and 4:3 test patterns that would be necessary to do this properly.

It does say, in the manual on page 173, that there is a 16:9/4:3 aspect frame in there, so you should have a test pattern available specifically for 16:9 screen alignment, but I'm not sure how setting your screen aspect ratio to 16:9 impacts this directly.

I know that's a lot of words to say 'I don't know for sure'.
[Edited by AV_Integrated on Sep 6, 2022 at 5:42 AM]
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
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The very fact that you are not sure gives me something to go on.Thanks. Also it leads me to another question. In 16:10 format there is a 16:9 frame test pattern although this is just a border not a grid. Does this stay 16:9 when you change the screen format from 16:10 to 16:9?
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Unfortunately, I'm limited to what the manual talks about, and then I'm still left guessing.

I would have been more specific in the manual about things. I think the manufacturers of business class projectors sometimes gloss over 'SCREEN FORMAT' vs. 'ASPECT RATIO' in their specifications and their manuals. They are different things, and I am not able to decipher how they specifically work with that particular model. I would need to play with it.

My expectation on the internal test patterns is that they are images which are stored in memory in the projector, and then are recalled. I would expect them to match the native resolution of the projector. So, 1920x1200 images. The 16:9 test pattern is likely a 1920x1080 image while the 4:3 one would be 1600x1200. But, this gets into some really specific stuff internal to the projector, and I would reach out to Panasonic to try to get specific answers on this.

I am quite sure their tier 1 tech support would have NO idea on the actual answer to this. So, you would need to get to a commercial projector specialist and ask them.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.