System and method for a transparent color image display utilizing fluorescence conversion of nanoparticles and molecules

Abstract

A system and a method of a transparent color image display utilizing fluorescence conversion (FC) of nano-particles and molecules are disclosed. In one preferred embodiment, a color image display system consists of a light source equipped with two-dimensional optical scanning hardware and a FC display screen board. The FC display screen board consists of a fluorescence display layer, a wavelength filtering coating, and a visibly transparent substrate. In another preferred embodiment, two mechanisms of light excitation are utilized. One of the excitation mechanisms is up-conversion where excitation light wavelength is longer than fluorescence wavelength. The second mechanism is down-conversion where excitation wavelength is shorter than fluorescence wavelength. A host of preferred fluorescence materials for the FC screen are also disclosed. These materials fall into four categories: inorganic nano-meter sized phosphors; organic molecules and dyes; semiconductor based nano particles; and organometallic molecules. These molecules or nano-particles are incorporated in the screen in such a way that allows the visible transparency of the screen. Additionally, a preferred fast light scanning system is disclosed. The preferred scanning system consists of dual-axes acousto-optic light deflector, signal processing and control circuits equipped with a close-loop image feedback to maintain position accuracy and pointing stability of the excitation beam.

1 . A two-dimensional color image display setup with visibly transparent screen based on fluorescence conversion comprising: 
 at least one excitation light beam operating in a wavelength range of >700 nm or <450 nm;    an optional imaging processing unit projecting the said light beam to specified positions with specified light intensities;    a displaying screen comprising at least one layer of transparent medium containing at least one type of electromagnetic radiation activated visible light emitting ingredients;    a coating attached to the said layer of transparent medium of the said displaying screen separating the said visible light from the said excitation light;    a covering layer of transparent materials protecting the said transparent layer of medium containing the said visible light emitting particles of the said displaying screen.    
   
   
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