When it come to displays all the counts is the number of pixels you have for the image. Because your image have a different aspect ratios then your display you need to decide if you want to display your image with borders on two opposite sides or crop your images to your displays aspect ratio and fill the display area. You can do it either way. I would not save all the resized pages into a PDF fil. If you have your pages as print size PSD files in a folder it is easy to batch process the psd file and save our Jpeg file to be displayed on your display using a slide show application. First you need to choose borders or crop.
JJ, Thanks. I created an action to export to jpg, then did a slideshow in Lightroom. Worked out fine. Thanks, again.