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Abstract:
Traditional flat screen displays present 2D images. 3D and 4D
displays have been proposed making use of lenslet arrays to
shape a fixed outgoing light field for horizontal or
bidirectional parallax. In this article, we present different
designs of multi-dimensional displays which passively react to
the light of the environment behind. The prototypes physically
implement a reflectance field and generate different light
fields depending on the incident illumination, for example
light falling through a window.
We discretize the incident light field using an optical system,
and modulate it with a 2D pattern, creating a flat display
which is view \emph{and} illumination-dependent. It is free
from electronic components. For distant light and a fixed
observer position, we demonstrate a passive optical
configuration which directly renders a 4D reflectance field in
the real-world illumination behind it. We further propose an
optical setup that allows for projecting out different angular
distributions depending on the incident light direction.
Combining multiple of these devices we build a display that
renders a 6D experience, where the incident 2D illumination
influences the outgoing light field, both in the spatial and in
the angular domain. Possible applications of this technology
are time-dependent displays driven by sunlight, object
virtualization and programmable light benders / ray blockers
without moving parts.
