摘要:
A camera flash comprises a light guide arranged to extract light at least through one surface; and one or more light sources arranged, in use, to emit light into the lightguide. Each light source is an LED or a laser diode. The camera flash is connectable, in use, to drive circuitry, the drive circuitry being for driving the light source(s) to emit a pulse of light. The waveguide spreads out the light from the light source(s), so that a flash of light from the camera flash does not present a safety risk, while minimizing loss of the light from the light source(s). The camera flash can thus provide a high overall optical output, spread over an extended area (as defined by the waveguide). The lightguide may for example be disposed around a camera module of a mobile telephone camera.
摘要:
A light guide includes a light guide substrate having a top surface through which light is to be emitted, a bottom surface, an incident edge surface through which incident light is to be introduced into the light guide substrate, and another edge surface. The another edge surface includes at least one micro structure operative to reflect at least a portion of the incident light, which travels through the light guide substrate and is incident on the another edge surface, back within the light guide substrate.
摘要:
According to an aspect of the invention, a light guide is provided which includes a light guide substrate having a top surface through which light is to be emitted, a bottom surface, an incident edge surface through which incident light is to be introduced into the light guide substrate, and another edge surface. The another edge surface includes at least one micro structure operative to reflect at least a portion of the incident light, which travels through the light guide substrate and is incident on the another edge surface, back within the light guide substrate.
摘要:
A phosphor-based multi-colored display is provided which includes a spatial light modulator comprising an addressable array of apertures each corresponding to a respective sub-pixel in the display; an array of phosphor regions each indexed to a corresponding aperture of the spatial light modulator; and a backlight which provides quasi-monochromatic light to phosphor within each of the phosphor regions. The phosphor within each of the phosphor regions, upon being excited by the quasi-monochromatic light of the backlight, emits light having a color different from a color of the quasi-monochromatic light, through the corresponding aperture of the spatial light modulator.
摘要:
An illumination system comprises at least one light source (2) and a light-guide (1). A first part of the light-guide (1) is defined by a surface (12) for light emission and a back surface (13), and a second part of the light-guide is defined by a light receiving surface (14) and a light reflecting surface (15). The light source (2) is disposed adjacent or substantially adjacent to the light receiving surface (14), and light from the light source enters the light-guide through the light receiving surface (14), and is reflected by the light reflecting surface (15) into the first part of the light-guide. Light is emitted from the waveguide through the surface (12) for light emission, and may be used to illuminate, for example, a display device placed over the surface (12) for light emission. The light source and the light receiving surface are on the same side of the waveguide as the surface for light emission.
摘要:
An illumination system comprises at least one light source (2) and a light-guide (1). A first part of the light-guide (1) is defined by a surface (12) for light emission and a back surface (13), and a second part of the light-guide is defined by a light receiving surface (14) and a light reflecting surface (15). The light source (2) is disposed adjacent or substantially adjacent to the light receiving surface (14), and light from the light source enters the light-guide through the light receiving surface (14), and is reflected by the light reflecting surface (15) into the first part of the light-guide. Light is emitted from the waveguide through the surface (12) for light emission, and may be used to illuminate, for example, a display device placed over the surface (12) for light emission. The light source and the light receiving surface are on the same side of the waveguide as the surface for light emission.
摘要:
A lamp comprises a thin layer of phosphor (105,113) which is irradiated (46), for example by ultraviolet radiation, by a source which typically comprises a laser diode and a condenser (101,111). This causes the phosphor (105,113) to emit visible light with a Lambertion-type emission pattern. An optical system such as a reflector (102,115) concentrates the light from the phosphor (105,113). The phosphor (105,113) is thermally connected to a heatsink (103,116), of example by a plate (114) of sapphire glass, so as to dissipate the heat produced by the phosphor (105,113). The phosphor (105) may be mounted on a plane reflector (104) disposed on or comprising the heatsink (103) and facing a curved reflector (102) and the radiation source. Alternatively, the optical system may have an optical axis and the phosphor (113) may be substantially flat and inclined with the respect to the optical axis.
摘要:
A lamp comprises a thin layer of phosphor (105,113) which is irradiated (46), for example by ultraviolet radiation, by a source which typically comprises a laser diode and a condenser (101,111). This causes the phosphor (105,113) to emit visible light with a Lambertion-type emission pattern. An optical system such as a reflector (102,115) concentrates the light from the phosphor (105,113). The phosphor (105,113) is thermally connected to a heatsink (103,116), of example by a plate (114) of sapphire glass, so as to dissipate the heat produced by the phosphor (105,113). The phosphor (105) may be mounted on a plane reflector (104) disposed on or comprising the heatsink (103) and facing a curved reflector (102) and the radiation source. Alternatively, the optical system may have an optical axis and the phosphor (113) may be substantially flat and inclined with the respect to the optical axis.
摘要:
An illumination panel is provided, for example for use as a backlight for illuminating an at least partially transmissive display (1). The panel comprises a light source (18), for example in the form of a light emitting diode which emits light in a relatively narrow waveband. A light guide (3) receives the light from an edge surface and guides light by total internal reflection. Combined light extraction and phosphor elements (19) on at least one of the major surfaces of the light guide (3) permit extraction of the light but also convert at least some of the light from the light source (18) to a different visible waveband. By locating the combined phosphor and extraction features at least partially inside the lightguide (3) it is possible to control the angular distribution of the extracted light and, in particular, to arrange for the variation of intensity with angle of light extracted without wavelength conversion to be substantially the same as the variation of intensity with angle of light emitted with wavelength conversion.
摘要:
A backlight is provided for illuminating an at least partially transmissive display. The backlight includes a light source. A light guide receives the light from an edge surface and guides the light by total internal reflection. Groove structures which are located on at least one of the major surfaces of the light guide permit redistribution of light around obstacles that may be present within the light guide structure, thereby maintaining brightness uniformity of the backlight or illumination panel.