474 results about "Direct illumination" patented technology

In one embodiment of this invention, a lightguide comprises a low refractive index region disposed between light extracting region and a non-scattering region. In further embodiment of this invention, volumetric scattering lightguide comprises a low refractive index region disposed between a volumetric scattering region and a non-scattering region. In some embodiments, a light emitting device comprising a volumetric scattering lightguide can angularly filter light input into the edge of a volumetric scattering lightguide by controlling the refractive index of the low refractive index region relative to the refractive index of the non-scattering region to prevent direct illumination of the volumetric scattering region, provide a luminance uniformity greater than 70%, or improve the angular luminous intensity of the light emitting device. The volumetric scattering lightguide may be curved, tapered, and a light emitting device comprising the same may further comprise at least one light source and a light redirecting element.

A display provides increased contrast and resolution via first LCD panel energized to generate an image and a second LCD panel configured to increase contrast of the image. The second panel is an LCD panel without color filters and is configured to increase contrast by decreasing black levels of dark portions of images (making them blacker or darker) using polarization rotation and filtration. Preferably, the second LCD panel is of higher resolution than the first LCD panel. The panels may be directly illuminated or edge lit, and may be globally or locally dimmed monochrome or multi primary lights that may also include individual control of color intensities for each image or frame displayed. The panels may be placed in any order, but preferably are arranged such that active layers in each panel are as close together as possible. Brightness is maintained by the combination of reusing polarization between the panels and by not going through more than one set of color filters. Improved contrast is a result of using multiple light modulators in series.

In a directly-illuminated liquid crystal display (LCD), for example an LCD monitor or an LCD-TV, a number of light management layers lie between the light source and the LCD panel to provide bright, uniform illumination. The light management layers, including, for example, a diffuser, a reflective polarizer and a brightness enhancing layer, are contained in a light management unit that is formed from two subassemblies. The two subassemblies each contain a substrate and are attached together so as to leave a gap between the two subassemblies. The diffuser is located in one of the subassemblies, and the other light management layers may be in either of the subassemblies, or may be disposed in the gap between the subassemblies.

An imaging directional backlight apparatus including a waveguide, a light source array, for providing large area directed illumination from localized light sources. The waveguide may include a stepped structure, in which the steps may further include extraction features optically hidden to guided light, propagating in a first forward direction. Returning light propagating in a second backward direction may be refracted, diffracted, or reflected by the features to provide discrete illumination beams exiting from the top surface of the waveguide. Viewing windows are formed through imaging individual light sources and hence defines the relative positions of system elements and ray paths. The uncorrected system creates non-illuminated void portions when viewed off-axis preventing uniform wide angle 2D illumination modes. The system may be corrected to remove this non uniformity at wide angles through the introduction of additional sources away from the system's object plane, additional imaging surfaces, and/or by altering ray paths.

Disclosed is an imaging directional backlight apparatus for providing large area uniform directed illumination from localized light sources. Within an exemplary optical valve system, a waveguide comprises a stepped structure, where the steps comprise extraction features hidden to guided light, propagating in a first forward direction. Returning light propagating in a second backward direction may be refracted, diffracted, or reflected by the features to provide discrete illumination beams exiting from the top surface of the waveguide. Such controlled illumination may provide for efficient, multi-user autostereoscopic displays as well as improved 2D display functionality. Illumination uniformity is provided by the positioning, packaging, and optically modifying of individual input sources. The latter employs non-imaging and refractive optics.

An intraocular light probe has a mask or shield affixed at its distal end thereof which forms a directed light beam for intraocular illumination of target tissues or intraocular application of therapeutic light. The mask or shield serves to more fully focus, intensify and direct the beam toward the target tissues. The mask or shield also helps direct light away from other tissues and away from the eyes of the surgeon. This lessens unwanted glare. By placing a light probe beneath a surgical instrument such as a phacoemulsifier or vitrector, laser, cutting instrument (e.g., scissors or knife), forceps or probe/manipulator, whether as part of or separate from an infusion sleeve, a mask or shield effect is created. This has the same benefits of directing the beam toward target tissues, away from other tissues and away from the eyes of the surgeon. The mask or shield is opaque or semi-opaque and made of a soft, semi-rigid or rigid material. The shield can be rigid enough to serve as the shaft of an instrument with a probe or manipulator at its distal tip. It may also be reflective on the side adjacent to the fiber bundle to help direct, magnify, and intensify the beam of light. The shape of the shield can be flat, curved or circular with an opening along one side. The mask/shield can be removed from the fiberoptic light for sterilization. The device of the invention is preferably introduced into the eye via the primary or side-port incision to provide intraocular cross-lighting of tissues during surgical procedures such as cataract surgery, corneal surgery, vitrectomy, intraocular lens implantation, refractive surgery, glaucoma surgery and vitreo/retinal surgery.

An imaging directional backlight apparatus including a waveguide, a light source array, for providing large area directed illumination from localized light sources. The waveguide may include a stepped structure, in which the steps may further include extraction features optically hidden to guided light, propagating in a first forward direction. Returning light propagating in a second deflected direction may be refracted, diffracted, or reflected by the features to provide discrete illumination beams exiting from the top surface of the waveguide. Viewing windows are formed through imaging individual light sources from the side of the waveguide and hence defines the relative positions of system elements and ray paths. A directional backlight with small footprint and low thickness may be provided.

An imaging directional backlight apparatus including a waveguide, a light source array, for providing large area directed illumination from localized light sources. The waveguide may include a stepped structure, in which the steps may further include extraction features optically hidden to guided light, propagating in a first forward direction. Returning light propagating in a second backward direction may be refracted, diffracted, or reflected by the features to provide discrete illumination beams exiting from the top surface of the waveguide. Viewing windows are formed through imaging individual light sources by waveguide facets and rear reflector images in cooperation. Viewing windows may be provided at first and second different window planes to improve uniformity in a lateral direction. Further, stray light may be reduced by inner and outer portions of reflective facets with different inclinations for the rear reflector.

An imaging directional backlight apparatus including a waveguide, a light source array, for providing large area directed illumination from localized light sources. The waveguide may include a stepped structure, in which the steps may further include extraction features optically hidden to guided light, propagating in a first forward direction. Returning light propagating in a second backward direction may be refracted, diffracted, or reflected by the features to provide discrete illumination beams exiting from the top surface of the waveguide. A rear reflector is arranged to receive light transmitted by the features and to provide polarization recirculation. Viewing windows are formed through imaging individual light sources and hence defines the relative positions of system elements and ray paths. Retarder stack arrangements are provided to increase the efficiency of polarization recirculation, reduce the visibility to damage and to reduce color changes with viewing angle.

The invention provides a light-emitting keyboard comprising multiple direct illumination-type light-emitting elements, an induction circuit layer, multiple keys and multiple light-transmitting elastic bodies. When the keys are close to the induction circuit layer, the induction circuit layer correspondingly generates a non-contact type key signal. Besides, each direct illumination-type light-emitting element is corresponding to one key and arranged below the corresponding key. Each light-transmitting elastic body is corresponding to one direct illumination-type light-emitting element and arranged between the corresponding direct illumination-type light-emitting element and the corresponding key. Light beams of each direct illumination-type light-emitting element penetrate through the corresponding light-transmitting elastic body and then are projected to the corresponding key. According to the design of the light-emitting keyboard, the direct illumination-type light-emitting elements are directly arranged below the keys, and the elastic bodies used for returning key caps to original positions and providing hand feeling for a user are designed in a light-transmitting way so that the light beams provided by the direct illumination-type light-emitting elements can be projected to the keys after directly penetrating through the light-transmitting elastic bodies, and thus use efficiency of light is effectively enhanced.

The embodiment of the invention provides a thin-film transistor, an array substrate and a manufacturing method and a display device thereof, relating to the technical field of displays, and aiming to avoid damage of an active layer of a semiconductor caused by direct illumination and etching, thereby improving the performance of a thin-film transistor (TFT) device. The thin-film transistor comprises a grid electrode, a grid insulation layer, a semiconductor active layer, an etching blocking layer, a source electrode and a drain electrode; the etching blocking layer covers the semiconductor active layer; and a first through hole and a second through hole are formed on the etching blocking layer; the source electrode of the thin film transistor is in contact with the semiconductor active layer through the first through hole; and the drain electrode of the thin film transistor is in contact with the semiconductor active layer through the second through hole. According to the embodiment of the invention, the manufacturing method is used for manufacturing the thin-film transistor and the array substrate, as well as the display device which utilizes the thin-film transistor and the array substrate.

The invention relates to a lighting device and a method of manufacturing such a lighting device. The lighting device (1) comprises a first light emitting element (101) being optically coupled to a light guide (110) having an out-coupling surface (111) for illumination via the light guide. Further, the lighting device comprises a second light emitting element (102) dedicated for direct illumination from the lighting device. The invention is advantageous in that the lighting device provides both a decorative look and a functional illumination, and is still energy-efficient since the light emitted from the second light emitting element is directly emitted from the light emitting element without unnecessary energy-loss.

A compact camera with a compact camera body integrated with a lens, a direct flash module and an indirect flash module. The direct flash unit includes a flash light emission window arranged to project direct illumination in a first direction toward an object to be photographed. The indirect flash unit includes an indirect flash light emission window arranged to project indirect bounce illumination in a second direction off of an indirect reflecting surface to the object. The camera also has a controller that receives a first signal containing information from a first light sensor connected to the direct flash unit, and a second signal containing information from a second light sensor connected to the indirect flash unit. In response to the received first and second signals, the controller selectively adjusts the amount of flash illumination projected from the direct and indirect flash units.

An imaging directional backlight apparatus including a waveguide, a light source array, for providing large area directed illumination from localized light sources. The waveguide may include a stepped structure, in which the steps may further include extraction features optically hidden to guided light, propagating in a first forward direction. Returning light propagating in a second backward direction may be refracted, diffracted, or reflected by the features to provide discrete illumination beams exiting from the top surface of the waveguide. The directional backlight may be arranged to switch between at least a first wide angular luminance profile mode and a second narrow angular luminance profile mode. The directional backlight is arranged to illuminate an LCD with a bias electrode arranged to switch liquid crystal directors in black state pixels between a first wide angular contrast profile mode and a second narrow angular contrast profile mode. Performance of privacy operation for off-axis snoopers is enhanced in comparison to displays with only directional backlights or switchable contrast properties.

A directional backlight apparatus includes a directional waveguide and a light source array, for providing large area directed illumination from localized light sources. Interfaces are provided between the directional waveguide and optical components adjacent the directional waveguide such that the coefficient of friction at the waveguide interfaces is greater than the coefficient of friction at least one outer interface on each side of the waveguide in the stack. Damage from compressive forces on the optical stack may be reduced, achieving improved optical performance and lifetime. Privacy display, low stray light display and autostereoscopic display may be provided with high uniformity, long lifetime and reduced cost mechanical components.

A method for a computer system includes receiving a plurality of values for an illumination parameter associated with an illumination source for a scene, determining a plurality illumination contributions for a surface of an object within the scene, in response to the plurality of values, determining a plurality of texture maps associated with the surface of the object in response to the plurality of illumination contributions, wherein each of the plurality of texture maps is associated with each of the plurality of values for the illumination parameter, receiving a value for the illumination parameter at render time from a user, determining a texture map associated with the surface of the object, in response to the value for the illumination parameter and in response to the plurality of texture maps, rendering the surface of the object using the texture map to form an image, and displaying the image to the user.

Embodiments of the invention are directed to wall recessed two-component luminaires. The two components can include a primary optical subsystem and a secondary optical subsystem. The primary optical subsystem can provide indirect lighting, illuminate an architectural space upward toward a ceiling, and/or have greater luminous flux than the secondary optical subsystem. The secondary optical subsystem can provide direct lighting, illuminate an architectural space horizontally and/or downward, provide lit appearance, provide direct view color and/or color gradients, provide direct view luminance and/or luminous gradients, and/or provide lighting for ambience.