The systems and methods described herein relate to LED systems capable of generating light, such as for illumination or display purposes. The light-emitting LEDs may be controlled by a processor to alter the brightness and/or color of the generated light, e.g., by using pulse-width modulated signals. Thus, the resulting illumination may be controlled by a computer program to provide complex, predesigned patterns of light in virtually any environment.

Multicolored led lighting method and apparatus

A lighting device comprising first and second groups of solid state light emitters, which emit light having peak wavelength in ranges of from 430 nm to 480 nm, and first and second groups of lumiphors which emit light having dominant wavelength in the range of from 555 nm to 585 nm. In some embodiments, if current is supplied to a power line, a combination of (1) light exiting the lighting device which was emitted by the first group of emitters, and (2) light exiting the lighting device which was emitted by the first group of lumiphors would have a correlated color temperature which differs by at least 50 K from a correlated color temperature which would be emitted by a combination of (3) light exiting the lighting device which was emitted by the second group of emitters, and (4) light exiting the lighting device which was emitted by the second group of lumiphors.

Lighting device and lighting method

A compact and efficient optical system featuring planar multi-layered LED light source arrays concentrating their polarized or unpolarized output within a limited angular range. The optical system manipulates light emitted by a planar light emitters such as electrically-interconnected LED chips. Each light emitting region in the array is surrounded by reflecting side-walls whose output is processed by elevated prismatic films, polarization converting films, or both. The optical interaction between light emitters, reflecting sidewalls and the elevated prismatic films create overlapping virtual images between emitting regions that contribute to the greater optical uniformity. Practical illumination applications of such uniform light source arrays include compact LCD of DMD video image projectors, as well as general lighting, automotive lighting, and LCD backlighting.

Uniform illumination system

The present invention relates to systems and methods for generating and/or modulating illumination conditions to generate high-quality light of a desired and controllable color, for creating lighting fixtures for producing light in desirable and reproducible colors, and for modifying the color temperature or color shade of light within a prespecified range after a lighting fixture is constructed. In one embodiment, LED lighting units capable of generating light of a range of colors are used to provide light or supplement ambient light to afford lighting conditions suitable for a wide range of applications.

Systems and methods for generating and modulating illumination conditions

Methods and apparatus for generating essentially white light. In one example, a white light generating apparatus comprises at least one first white LED characterized by a first spectrum, and at least one second white LED characterized by a second spectrum, wherein the first spectrum is substantially different than the second spectrum.

Methods and apparatus for generating and modulating illumination conditions

A light source constructed from a two dimensional array of light emitting devices. The light emitting devices include first, second and third types of light emitter. The first type of light emitting device covers a first area in the two dimensional array and emits light in a first region of the optical spectrum. The second type of light emitting device covers a second area in the two dimensional array and emits light in a second region of the optical spectrum, and the third type of light emitting device covers a third area in the two dimensional array and emits light in a third region of the optical spectrum. The first, second, and third areas are chosen such that the simultaneous output from all emitters generates white light. At least one of the emitter types covers an area larger than that covered by the others. In the preferred embodiment of the present invention, the first type of light emitting device includes a light emitting device that emits light at a wavelength less than the wavelength of a green region of the optical spectrum; a color conversion compound absorbs this light and re-emits it in the green region of the optical spectrum.

Projector light source utilizing a solid state green light source

PROBLEM TO BE SOLVED: To provide a solid-state light source which can improve light emission of a green-color zone and can be used as a stable white-color light source. SOLUTION: A light source 60 constitutes a two-dimensional array of light emitting devices. Each of the light emitting devices has a first type of light emitting device 65 having a first occupation area of the two-dimensional array for emitting light in a green-color zone of an optical spectrum, a second type of light emitting device 61 having a second occupation area of the two-dimensional array for emitting light in a blue-color zone in the spectrum, and a third type of light emitting device 62 having a third occupation area of the array for emitting light in a red-color zone of the spectrum. The first, second and third areas are selected to generate white color light when all the light emitting elements emit light simultaneously. At least, one of the first, second and third areas is different in size from another of the first, second and third areas. The first type of light emitting device 65 is made up of a light emitting device which is the same as the second type of light emitting device 61 and a fluorescent substance 63 acting to perform wavelength conversion.

Projector light source using solid-state green-color light source

An illumination source[70] for use in projectors and the like. The illumination source[70] includes a light source[71,81] that generates a two-dimensional emission pattern having a light intensity that varies as a function of position in the emission pattern. A collector[72,82] collects the light from the light source[71,81] and illuminates an exit aperture[76] therewith. The illuminated exit aperture[76] has a two-dimensional emission pattern with a light intensity that varies as a function of position in a manner that is more uniform as a function of position than the emission pattern of the light source[71,81]. An imaging optical element[73] images the exit aperture[76] onto a surface[74]. The collector[72,82] is preferably a compound parabolic concentrator or a compound elliptical concentrator. In one embodiment of the invention, a partially reflecting film[83] is placed between the exit aperture[76] and the imaging optical element[73]. The partially reflecting film[83] reflects light of a first polarization state back into the collector[72,82] and transmits light of the orthogonal polarization state. In another embodiment of the invention, a quarter wave plate[84] is introduced between the exit aperture[76] and the partially reflecting film[83] to further increase the radiance of the source.

Illumination source with light emitting diodes for an image projector

The present invention is a composition for use in constructing a photosensitive film for recording color images. The preferred composition includes first, second, and third particle types. Each particle type comprises a crystalline base material having a trap dopant and a color dopant deposited therein. Each of the color dopants has a different activation energy for releasing electrons into the conduction/communication band of the crystalline base material. This results in a different spectral sensitivity for each dopant, and, hence for each particle type. In addition, each of the trap dopants has a different activation energy for releasing trapped electrons into the conduction/communication band of the crystalline base material. This enables the recorded color image to be read out one color at a time, which avoids color distortion. The invention also provides a photosensitive film for recording a color image. The film comprises a backing material having a plurality of depressions therein. The depressions are filled with a photosensitive material that includes first, second, and third particle types. Each particle type comprises a crystalline base material doped with atoms of a trap dopant and a color dopant. Each color dopant has a different spectral sensitivity, and each trap dopant has a different activation energy for releasing trapped electrons into the conduction/communication band of the crystalline base material.

Phosphor film composition for use in image capture

PROBLEM TO BE SOLVED: To reduce the loss of light emitted by an LED at a display light source incorporating an LED array. SOLUTION: Respective LEDs 21, 22 and 23 constituting the LED array are arranged on a base body 24 reflecting the light emitted. The upper surface of the base body 24 is constituted so as to have plural surfaces mutually inclined by a specified angle. Plural LEDs 21, 22 and 23 are respectively arranged on the plural surfaces of the base body 24, and are set so as to mutually face in an inclining direction. Thus, such situation is eliminated that the light is caught by the inside of a groove-like interstice constituted by adjacent LEDs and the light emitted is absorbed by the inside of a next LED.

Andreas G. Weber

Papers

Projector light source utilizing a solid state green light source

Projector light source using solid-state green-color light source

Illumination source with light emitting diodes for an image projector

Phosphor film composition for use in image capture

Light source for projection type display