Around the time of the New Millennium, the microwave mapping of the universe was begun and it was almost immediately determined that the universe is flat. Amazingly, it was once thought that the earth was flat and the sky was round, sitting like an inverted bowl over the earth. Now the earth is round and the sky is flat. We live in a flat universe.
I recently published a blog article about a flat panel camera. Shortly thereafter Technology Review published an article on the same subject. Now Apple has patented a flat panel fingerprint sensor. As I noted before, as each component reaches its norm areal and performance limit, man components such as cameras, speakers, and now biometrics will be improved by making larger but flat versions. When the screen becomes flexible, these components will need to be flexible as well.