The bottom portion of the display panel can be textured in various ways to permit touch typing.
of course the keyboard should be as thin as possible. It may have no moving parts at all but be sensitive to pressure, feeding back a click through the loudspeaker when a successful press has taken place. Keyboards of this kind have been available for several years. Once one has gotten used to the idea of no moving parts, he is ready for the idea of no keyboard at all!