More sensible would be to project a 4-Dimensional object into a 3-Dimensional one, like a hologram. It would then only require the 3D slices to be shown in sequence, and viola! 4D TV.
Then, if it physically appears 3D, and we know that 3D can be represented on a 2D format, then it only remains to render a 3D cross-section onto a 2D screen, and then show the sequence of fourth-dimensional images strung together.
And there you have it. Disney/Pixar's Toy Story.
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