Front digital projection (FDP) displays have the features of being portable,
economical and scalable for large size displays. Unfortunately, existing FDP technologies
suffer with poor image contrast in well-lighted environments, due to the "black-level"
issues of the conventional white diffusive screens. More powerful projectors can be
applied to enhance contrasts by increasing the brightness, at the expenses of significantly
increased cost, weight, power consumption, and viewer eye fatigue due to the bright
In this joint paper, we demonstrate an innovative full color, high contrast front
projective display system on a black emissive screen (BES). It comprises of a novel
transparent fluorescent screen on pitch-black substrate, and a digital image projector with
optic output that excite the fluorescent screen. The fluorescent layered screen is
comprised of at least 3 layers of RGB emissive materials, which are made in fully
transparent form. The "excitation" projector is based on DLP® projector platform, where a
UHP lamp is filtered by a color filter wheel which sequentially excites the RGB emissive
layers resulting in RGB emissions from the screen.
This display combines the best of both worlds of front projection and emissive display
technologies. Like projection displays, it is scalable and economic at large displays, the
screen has no pixel structure and can be manufactured using a roll to roll method. Like
emissive displays (e.g. plasma or field emission displays with phosphor screen), the
quality of the emissive images on black back-plate is superior, with large viewing angles
and superior contrasts in any environments. The new projection display can favorably compete with existing flat panel displays and other projection displays.