Surface display units with opaque screen

Abstract

A surface display unit incorporates an opaque screen and an image panel. The opaque screen is disposed on the front side of the image panel which provides an optical image. The opaque screen generally hides the image panel while the surface display unit is not in use. When the image panel is activated to provide an optical image, the opaque screen provides a suitable level of transparency so that a viewer can observe the optical image with sufficient clarity. The opaque screen can provide optical enhancement, decorative texture, and/or mechanical support.

1 . A surface display unit comprising:
 an image panel configured to provide an optical image on a front surface thereof; and   an opaque screen disposed over the front surface of the image panel,   
       wherein the opaque screen comprises an opaque matrix material layer that transmits light, reflects light or transmits and reflects light from the image panel, wherein the opaque matrix material layer comprises one or both of an electrochromatic material layer and a photochromatic material layer. 
     
     
         2 . The surface display unit of  claim 1 , wherein the opaque matrix material layer attenuates light impinging thereupon from a front side of the opaque matrix material layer and transmits light from the image panel. 
     
     
         3 . The surface display unit of  claim 1 , wherein the opaque matrix material layer further comprises an opaque glass-ceramic material. 
     
     
         4 . The surface display unit of  claim 1 , wherein the opaque matrix material layer is provided as a single sheet or as a laminate structure comprising multiple layers. 
     
     
         5 . The surface display unit of  claim 1 , wherein the opaque matrix material layer further comprises a glass core with at least one optically opaque cladding thereupon. 
     
     
         6 . The surface display unit of  claim 1 , wherein the opaque matrix material layer comprises a material having one or more peaks in a transmission coefficient as a function of wavelength within a range from 400 nm to 800 nm. 
     
     
         7 . The surface display unit of  claim 6 , wherein multiple peaks are present in the transmission coefficient, and correspond to wavelengths of illumination radiation of the optical image formed at the image panel. 
     
     
         8 . The surface display unit of  claim 1 , wherein the opaque matrix material layer comprises a material having at least two states corresponding to different transmission coefficients. 
     
     
         9 . The surface display unit of  claim 8 , wherein a ratio of a first transmission coefficient for an off-state to a second transmission coefficient for an on-state is in a range from 0.001 to 0.5 with a wavelength range from 400 nm to 800 nm. 
     
     
         10 . The surface display unit of  claim 1 , wherein the image panel comprises a display unit that generates an image employing a single illumination source. 
     
     
         11 . The surface display unit of  claim 1 , wherein the image panel comprises a pixilated display device or a display panel including a plurality of micro light emitting diodes provided in an array pattern. 
     
     
         12 . The surface display unit of  claim 1 , wherein the optical image is transmitted from the image panel through the opaque screen to a viewer. 
     
     
         13 . The surface display unit of  claim 1 , further comprising a projection source for emitting an image onto the opaque screen. 
     
     
         14 . The surface display unit of  claim 13 , wherein the image is reflected from the front surface to a viewer. 
     
     
         15 . The surface display unit of  claim 1 , wherein the image panel has multiple brightness settings to provide different amount of illumination. 
     
     
         16 . The surface display unit of  claim 1 , wherein the image panel has a color weighted brightness adjustment system to compensate for a non-uniform transmission coefficient curve of a material of the opaque matrix material layer within a visible wavelength range. 
     
     
         17 . The surface display unit of  claim 1 , wherein the surface display unit has comprises optical features that limit a viewing angle, the optical features being selected from gratings and an array of reflective surfaces. 
     
     
         18 . A surface display unit comprising:
 an image panel configured to provide an optical image on a front surface thereof; and   an opaque screen disposed over the front surface of the image panel,   
       wherein the opaque screen comprises an opaque matrix material layer that transmits light, reflects light or transmits and reflects light from the image panel, wherein the opaque matrix material layer further comprises a dye-sensitized material layer. 
     
     
         19 . The surface display unit of  claim 18 , wherein the opaque matrix material layer comprises a material having one or more peaks in a transmission coefficient as a function of wavelength within a range from 400 nm to 800 nm. 
     
     
         20 . The surface display unit of  claim 19 , wherein a ratio of a first transmission coefficient for an off-state to a second transmission coefficient for an on-state is in a range from 0.001 to 0.5 with a wavelength range from 400 nm to 800 nm.