Layered photochromic composition and device

An optical power-limiting passive (self-adaptive) device and method for limiting optical power transmission in lenses and windows, using layers of different photochromic compositions that exploit the full solar ultraviolet (UV) and short visible light spectrum. While a typical single photochromic material is activated by a UV band of wavelengths, e.g. 340 to 380 nm, adding a layer of photochromic material that is activated by an additional band of wavelengths, e.g., 380 to 420 nm, allows the efficient use of a wider band of solar UV and short visible light, e.g., 340 to 420 nm, thus enhancing the photochromic response to solar light.

ENHANCED RESPONSE PHOTOCHROMIC COMPOSITION AND DEVICE

The present invention relates to optical power-limiting device, and more particularly, to an optical power-limiting passive device and to a method for limiting optical power transmission in lenses and windows, using absorption changes in a novel photochromic composition, having response to infrared light in addition to the conventional response to ultra violet light. This additional response is featuring the use of the novel photochromic composition in places where ultra violet and short wave visible light is absent, or obscured, e.g. using photochromic glasses behind the front window of a car. 1. A photochromic material comprising:a photochromic dye having a changed transparency responsive to being exposed to ultraviolet light,up-conversion nanoparticles for absorbing visible light or near infrared light and re-emitting ultraviolet light to be directed to the photochromic dye, anda matrix material for hosting the up-conversion nanoparticles and the photochromic dye.2. The photochromic material of claim 1 , further comprising fluorescence-enhancing nanoparticles hosted within the matrix material for enhancing the fluorescent emission from the up-conversion nanoparticles.3. The photochromic material of claim 2 , further comprising environmental stabilizers for regulating radiation induced degradation of the matrix material.4. The photochromic material of claim 3 , further comprising thermal conductivity enhancers for decreasing the thermal response time of the matrix material.5. The photochromic material of claim 1 , wherein the photochromic dye and the up-conversion nanoparticles are dispersed within the matrix material.6. The photochromic material of claim 1 , wherein at least one of the photochromic dye or the up-conversion nanoparticles forms a layer adjacent the matrix material.7. The photochromic material of claim 1 , wherein the up-conversion nanoparticles include at least one nanoparticle selected from LaF claim 1 , NaYF claim 1 , LuPO claim 1 , YbPO claim 1 ...

LAYERED PHOTOCHROMIC COMPOSITION AND DEVICE

An optical power-limiting passive (self-adaptive) device and method for limiting optical power transmission in lenses and windows, using layers of different photochromic compositions that exploit the full solar ultraviolet (UV) and short visible light spectrum. While a typical single photochromic material is activated by a UV band of wavelengths, e.g. 340 to 380 nm, adding a layer of photochromic material that is activated by an additional band of wavelengths, e.g., 380 to 420 nm, allows the efficient use of a wider band of solar UV and short visible light, e.g., 340 to 420 nm, thus enhancing the photochromic response to solar light. 1. A layered photochromic composition comprising a plurality of layers of different photochromic materials , each of said layers having a unique activation spectral band that is different from the activation spectral band of the other layers to enhance the photochromic responsivity of the composition to impinging light.2. The layered photochromic composition of in which each of said layers includes a matrix material containing a photochromic dye.3. The layered photochromic composition of in which said impinging light is solar light.4. The layered photochromic composition of in which at least one of said layers on the light-receiving side of said layered photochromic composition is more resilient than at least one of said layers on the light-exiting side of said layered photochromic composition claim 1 , said at least one layer on the light-exiting side of said layered photochromic composition being more sensitive to the received light than said more resilient layers.5. The layered photochromic composition of in which each of said photochromic dyes comprises at least one dye selected from the group consisting of pyrans claim 1 , oxazines claim 1 , fulgides claim 1 , fulgimides claim 1 , diarylethenes claim 1 , in monomeric or polymeric ungelled solution or chemically bonded.6. The layered photochromic composition of in which each of said ...

SYSTEM FOR FACILITATING SELECTION OF COLOR CHANGING EYEWEAR LENSES AND WINDOWS

A system for facilitating a consumer's selection of customized color-changing lenses for eyewear, or windows, captures a digital color image of at least the face of the consumer and displays that color image to the consumer on a video display while superimposing a pair of lenses over the eyes. The display simulates the color of the superimposed lenses when made of a selected photochromic or thermochromic material. The color of the superimposed lenses is changeable, in response to consumer-controlled inputs, over a range between (a) an initial color for the lenses when subjected to at least one of (i) a first predetermined temperature and (ii) a first predetermined light condition, and (b) a final color for said lenses when subjected to at least one of (i) a second predetermined temperature higher than said first predetermined temperature and (ii) a second predetermined light condition brighter than said first predetermined light condition.

METHOD AND SYSTEM FOR ADJUSTING A PRESENTATION OF IMAGE DATA

A handheld device configured for displaying a modulated image. The handheld device comprises an image generation unit configured for projecting at least one light. The at least one light beam corresponding to image data and allows a presentation of the image data to a user. The handheld device further comprises a user interface configured for receiving at least one instruction for adjusting a display of said image data from the user and a modulation unit configured for modulating the at least one light according to said at least one instruction during the presentation.

System for facilitating selection of color changing eyewear lenses and windows

A system for facilitating a consumer's selection of customized color-changing lenses for eyewear, or windows, captures a digital color image of at least the face of the consumer and displays that color image to the consumer on a video display while superimposing a pair of lenses over the eyes. The display simulates the color of the superimposed lenses when made of a selected photochromic or thermochromic material. The color of the superimposed lenses is changeable, in response to consumer-controlled inputs, over a range between (a) an initial color for the lenses when subjected to at least one of (i) a first predetermined temperature and (ii) a first predetermined light condition, and (b) a final color for said lenses when subjected to at least one of (i) a second predetermined temperature higher than said first predetermined temperature and (ii) a second predetermined light condition brighter than said first predetermined light condition.

Enhanced response photochromic composition and device