How to Achieve High Quality for Full HD Screen

The export settings look correct. The potential issues are not that different in Photoshop compared to Illustrator. Let’s look at some possible causes. When you say you have to “remake” the poster, does that mean you are taking the old poster document and rearranging things, or you are re-creating the poster from a new blank document?

If you are designing in Photoshop in a document that started out 1080 by 1920 pixels, then it should not be pixelated. However, if you are reusing existing elements and scaling them up, that could look pixelated.

When I ran into a similar problem for web content I would use an artboard three times this size and it would be automatically resized online without the pixelation. Not sure if I can do this in this case...

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If this is digital signage at the cinema, we don’t know if that would work because it depends on the software displaying the image. If the software requires an exact match to the display, it might require exactly 1080 by 1920, and if that’s true it might not help to send an image with 3x pixel dimensions.

Also, the actual screens look much larger...

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You mean the actual screens look much larger than 1080 x 1920 pixels? Because 1080 x 1920 pixels is only a measurement of pixel dimensions, not real world dimensions in inches/cm. Because of that, 1080 x 1920 does not refer to any specific physical size, and in fact exists at many physical sizes. For example, you can have a full HD 1920 x 1080 screen on a 5-inch smartphone, a 9-inch tablet,  a 15-inch laptop, a 55-inch TV, or an 8-foot-wide image from a home theater projector. The only difference is how much area that same number of pixels is spread across. And the important thing is, they can all look equally sharp as long as you are viewing them at a distance that is normal for each type of screen. A 1920 by 1080 px 32-inch TV screen seen from the sofa 8 feet away can look as sharp as a 1920 by 1080 px phone you hold 2 feet from your eyes.

A vertical full HD digital sign is basically a normal full HDTV rotated to be vertical. If the screen is the size of a movie poster it might be 3 or 4 feet tall, but whatever size it is in feet, if it’s vertical HD it will be always be 1920 pixels tall. So if vertical HD is the spec, you export to 1920 px tall regardless of the physical size. If the sign is large, sharpness is not a problem if someone is at a normal viewing distance for a cinema sign…they will see it from maybe 6 to 20 feet away on the sidewalk, or 30 to 100 feet away from a car. At those distances, the relative size of the sign is small enough that people will not see pixels.

Your export settings are not the problem, because what you posted looks fine. When the poster looks pixelated in Photoshop, at what magnification are you viewing the document?