105results about How to "Light utilization efficiency can be improved" patented technology

In a display device, first and second substrates parallel to each other are arranged between first and second polarizers that are parallel to each other. A liquid crystal layer is arranged between the first and second substrates, and a light emitting layer having a quantum dot structure is arranged on the first polarizer. Also, a light source that emits a blue light is arranged under the second polarizer. Thus, the display device may improve a light utilizing efficiency, thereby improving a display quality.

A recess portion is formed in a substrate to accommodate a light emitting element so as to be sealed with a sealant. A light guide layer formed of a thin transparent resin film is fixed onto the substrate via an adhesive layer to realize an illuminating device with a thin structure. The light emitted from the light emitting element is irradiated into the light guide layer via the sealant and the adhesive layer. The light fully reflecting on the boundary surfaces between the light guide layer and the adhesive layer, and between the light guide layer and the air layer passes inside the light guide layer. Then the light which has not fully reflected leaks outside from the surface of the transparent resin film which forms the light guide layer. This makes it possible to illuminate the surface of the illumination device 1A entirely with brightness.

A vehicular lamp includes a light source, and a light guide body having a front surface and a rear surface, configured to allow light emitted from the light source to enter from the rear surface and to exit through the front surface. The rear surface of the light guide body comprises, in a first plane extending in a front-to-rear direction, a first entrance portion configured to allow light emitted from the light source to enter in such a way as to be refracted to the front, second entrance portions situated at both sides of the first entrance portion and configured to allow light emitted from the light source to enter in such a way as to be refracted sideways, and reflecting portions configured to internally reflect light from the light source which enters from the second entrance portions to the front.

A liquid crystal display device has: a light source, a light guide plate for causing light from the light source to enter from a side surface of the light guide plate and exit as illuminating light from one principal surface thereof; a liquid crystal panel which includes a reflective color filter having wavelength selectivity in transmittance and reflectance and a polarizing plate disposed on a side that is closer to the light guide plate than the reflective color filter, and which is disposed on a light path of the illuminating light; and a recycle part for reflecting the illuminating light that has been reflected by the reflective color filter toward the reflective color filter once again, wherein the light from the light source is configured to enter the light guide plate as approximately linear polarization, and the polarizing plate of the liquid crystal panel is configured so exhibit transmittance of 90% or higher.

In a display device, first and second substrates parallel to each other are arranged between first and second polarizers that are parallel to each other. A liquid crystal layer is arranged between the first and second substrates, and a light emitting layer having a quantum dot structure is arranged on the first polarizer. Also, a light source that emits a blue light is arranged under the second polarizer. Thus, the display device may improve a light utilizing efficiency, thereby improving a display quality.

A light guide plate (20) has a light incidence surface (221) for receiving light, a light emitting surface (223) for emitting light, and a bottom surface (222). The light emitting surface has a plurality of diffraction grating units. Each diffraction grating unit has a strong diffractive portion and a weak diffractive portion. In each diffraction grating unit, grating directions of the strong and weak diffractive portions are orthogonal to each other. Area ratios of the strong diffractive portions in the diffraction grating units progressively increase with increasing distance away from the light incidence surface. The grating directions of the strong diffractive portions may vary according to the locations of the diffraction grating units relative to a light source. These features improve the overall efficiency of utilization of light, and enable the light emitting surface to output highly uniform light.

A color separation device changes a light path according to the wavelengths of incident light and an image sensor has improved light utilization efficiency by using the color separation device. The color separation device may include a first element having a first refractive index that varies according to wavelengths of light along a first refractive index distribution curve, and a second element having a second refractive index that varies according to wavelengths of light along a second refractive index distribution curve, the second refractive index distribution curve being different from the first refractive index distribution curve. The color separation device may be manufactured by simply joining two elements, namely, the first and second elements, together and thus may be more easily manufactured and perform more effective color separation.

Method for the preparation of holographic diffusers where the holographic diffuser is designed through iterative calculations according to the Fraunhofer theory of diffraction and some constrain conditions. In the iterative calculation some constrain conditions that can change the magnitude of the light passing through the diffuser are used to design the diffuser. A novel iterative calculation is disclosed such that uniformed mixing of colors and high light utilization efficiency of the diffuser may be provided.

A light guide plate (20) has a light incidence surface (221) for receiving light, a light emitting surface (223) for emitting light, and a bottom surface (222). The light emitting surface has a plurality of diffraction grating units. Each diffraction grating unit has a strong diffractive portion and a weak diffractive portion. In each diffraction grating unit, grating directions of the strong and weak diffractive portions are orthogonal to each other. Area ratios of the strong diffractive portions in the diffraction grating units progressively increase with increasing distance away from the light incidence surface. The grating directions of the strong diffractive portions may vary according to the locations of the diffraction grating units relative to a light source. These features improve the overall efficiency of utilization of light, and enable the light emitting surface to output highly uniform light.

A color display apparatus includes a display panel which has a light reflection area and a light transmission area for each pixel, and a light source for causing light to enter the display panel from a back surface. The light reflection area includes a first subarea in which the incident light is modulated and reflected in a brightness change range within which a brightness of a reflected light is variable and a hue change range within which a hue of a chromatic color assumed by a reflected light is variable and a second subarea provided with a color filter in which incident light is modulated and reflected in a brightness change range within which a brightness of a reflected light is variable. In the light transmission area, the incident light is modulated in a brightness change range within which a brightness of a transmitted light is variable. The light source is periodically switched at least between two lights different in color. The apparatus can perform the modulation in the light transmission area in synchronism with the switching in color of the light source.

A sub-pixel structure of color electrophoretic display includes a driving unit, a display unit and a transparent electrode, wherein the display unit is disposed on the driving unit and the transparent electrode is disposed on the display unit. The display unit includes a plurality of first charged particles and a plurality of second charged particles. A color of the first charged particles is different from a color of the second charged particles. Diameters of the first charged particles are greater than diameters of the second charged particles. The first charged particles and the second charged particles have the same electrical property. The sub-pixel structure of color electrophoretic display has high light utility efficiency.

A lighting device with a stable high light intensity can effectively dissipate heat generated by an LED so that the light emission efficiency does not deteriorate while the inside temperature distribution can be maintained in an even state. The lighting device can also be configured to prevent snow from adhering onto an outer lens by allowing an outer surface temperature of the lighting device to rise during actuation of the device. The lighting device can also be configured to improve light utilization efficiency. The lighting device can include a semiconductor light emitting device as a light source and can include structure(s) that guides the emission light to a projection lens. The semiconductor light emitting device can be configured to emit light in a reverse or opposed direction with respect to an illumination direction for the lighting device. A projection lens can be disposed in front of the semiconductor light emitting device. An elliptic reflector can be configured to reflect light from the semiconductor light emitting device and to direct the light to the projection lens. A lens holder can be made of metal and the semiconductor light emitting device and the projection lens can be disposed on the lens holder.

A luminous keyboard includes a light-emitting element, a membrane wiring board, plural keys, and a light guide plate module. The plural keys are used for correspondingly triggering the plural membrane switches. The light-emitting element is used for providing the light beam to the luminous keyboard. The light guide plate module includes a first reflective layer, a second reflective layer, and a light-guiding layer between the first reflective layer and the second reflective layer. The light-guiding layer includes plural light-outputting regions and a spacing region. The plural light-outputting regions are aligned with the plural keys, respectively. The spacing region is arranged around the plural light-outputting regions. Moreover, plural light-guiding dots are located at the plural light-outputting regions, and at least one light diffusion structure is located at the spacing region.

The present application relates to an optical film and a use thereof. In the present application, through control of an alignment state of a liquid crystal compound in a liquid crystal layer, the liquid crystal layer may exhibit so-called reverse-wavelength dispersion while forming a single thin layer. An optical film including the liquid crystal layer may show optical modulation in a display device such as a liquid crystal display (LCD), organic light emitting device (OLED), or the like, or may be used in various applications, for example, as an optical element capable of improving light utilization efficiency, an element for implementation of a stereoscopic image and quality improvement thereof, and so forth.

A backlight module includes a light source and a light guide plate. The light guide plate includes a light-receiving surface next to a light source, a light-emitting surface, and a light-reflecting surface oppose to the light-emitting surface. A plurality of notches are formed on the light-reflecting surface, and each notch has a first inner surface facing the light source and a second inner surface back to the light source and opposite to the first inner surface. The inclination angle of the first inner surface with respect to the light-reflecting surface is no more than 35 degrees.

A polarizing conversion element array (500) of a polarization converter (414) has two polarizing conversion elements (510) provided with a polarization separating film (511) for separating a light beam into two linearly polarization beams and a reflecting film (512) that reflects one of the linearly polarization beams separated by the polarization separating film (511) in an alternate manner, the two polarizing conversion elements (510) being arranged so that the respective polarization separating films (511) and the reflecting films (512) are opposed, the polarization converter (414) being constructed by adhering a retardation plate (600) on a light-irradiation side of the polarizing conversion element array (500) stretching over the two polarizing conversion elements (510).

Light emitted from light-projecting elements constituted by LEDs (light-emitting diodes) or the like is transmitted to a light-projecting optical system of a sensor head portion through an optical fiber cable and projected from the light-projecting optical system onto an object. The light projected onto the object is reflected on the object. The reflected light is made incident on a light-receiving optical system. The light incident on the light-receiving optical system is led to a light-receiving element. The light-receiving element detects the incident light and generates a light-receiving signal based on the quantity of the detected light. The light-receiving signal generated by the light-receiving element is transmitted to a signal processing control portion of a main body portion through a light-receiving circuit and an electric wire cable.

A light guide plate has a light incident surface, a light emitting surface and a bottom surface. The bottom surface or the light emitting surface has a plurality of light guide units disposed thereon. Each of the light guide units has a first curved surface and a second curved surface connected with the first curved surface. Both of the first curved surface and the second curved surface are concave surfaces or convex surfaces. In a cross section perpendicular to the light incident surface and passing through the first curved surface and the second curved surface, the first curved surface and the cross section intersect in a first curved line, and the second curved surface and the cross section intersect in a second curved line. A curvature radius of the first curved line is greater than that of the second curved line.

An optical lens for use in a vehicle light can be compact and less expensive and has an outer appearance that has a high commercial value and achieves a high light utilization efficiency. The optical lens can include a light incident surface that receives light from a light source and a light output surface to output the light. The light incident surface can include a center light incident surface formed at its center and being convex toward the light source with a plurality of prisms with a polygonal shape formed radially from its center to its periphery. The light output surface can include a toroidal surface corresponding to the center light incident surface and a surrounding light output surface corresponding to the prisms.

The present disclosure discloses a light control lens and a light source device using the same. The light control lens comprises a light emitting surface, a light incident surface, and a total internal reflection (TIR) inclined surface. The light incident surface and the TIR inclined surface are at the opposite side of the light emitting surface. The TIR inclined surface is at the peripheral side of the light incident surface. Between the TIR inclined surface and a plane perpendicular to an optical axis of the light control lens, there is an included angle α of less than 45°. An effective radius of the light emitting surface is larger than the distance from an arbitrary point on the light emitting surface to a plane through an incident origin and perpendicular to the optical axis along the optical axis direction.

A sub-pixel structure of color electrophoretic display includes a driving unit, a display unit and a transparent electrode, wherein the display unit is disposed on the driving unit and the transparent electrode is disposed on the display unit. The display unit includes a plurality of first charged particles and a plurality of second charged particles. A color of the first charged particles is different from a color of the second charged particles. Diameters of the first charged particles are greater than diameters of the second charged particles. The first charged particles and the second charged particles have the same electrical property. The sub-pixel structure of color electrophoretic display has high light utility efficiency.

A light source assembly includes: a plurality of point light sources; a beam composing composite prism including a plurality of light inlet surfaces, a plurality of dichroic planes, and a light outlet surface; and an optical integrator including a plurality of light reflecting planes forming a light guide path, a light inlet end corresponding to one end of the light guide path, and a light outlet end corresponding to the other end of the light guide path. In the light source assembly, the plurality of point sources are each disposed in contact with one light inlet surface of the beam combining composite prism, and the beam combining composite prism and the optical integrator are coupled to each other such that the light outlet surface of the beam combining composite prism and the light inlet end of the optical integrator are in contact with each other.

A color display apparatus is consituted by a display panel which has light reflection area and a light transmission area for each pixel , and a light source for causing light to enter said display panel from a back surface of said display panel. The light reflection area includes plurality of subareas including a first subarea in which the incident light is modulated and reflected in a brightness change range within which a brightness of a reflected light is variable and a hue change range within which a hue of a chromatic color assumed by a reflected light is variable and a second subarea provided with a color filter in which incident light is modulated and reflected in a brightness change range within which a brightness of a reflected light is variable. In the light transmission area, the incident light is modulated in a brightness change range within which a brightness of a transmitted light is variable. The light source is periodically switched at least between two lights different in color. The apparatus further comprises means for performing the modulation in the light transmission area in synchronism with the switching in color of said light source.

An image sensor is provided including a photo sensor layer including a plurality of photo-sensing cells; a color separation layer disposed on the photo sensor layer and including color separation elements embedded in a transparent spacer layer; and a micro lens array arranged on the color separation layer, the micro lens array including a plurality of micro lenses. The color separation layer separates light by wavelength. The micro lens array concentrates incident light onto the plurality of color separation elements. The color separation elements include: a first main splitter which transmits light of a first primary color onto first photo-sensing cells which faces the first main splitter and diffracts and / or refracts light of colors other than the first primary color onto photo-sensing cells adjacent to the first photo-sensing cell; and a plurality of first auxiliary splitters which are arranged surrounding the first main splitter.

A luminous keyboard device includes a keypad module, a supporting plate, a flexible circuit board, a light-emitting element, a reflective layer, and a light guide plate. The supporting plate includes plural receiving parts. The flexible circuit board is contacted with the plural receiving parts to form plural bent structures. The light-emitting element and the reflective layer are disposed on the flexible circuit board. When a light beam is emitted by the light-emitting element, the portion of the light beam that is not directed to the light guide plate is reflected back to the light guide plate by the reflective layer on the plural bent structures. Consequently, the amount of light introduced into the light guide plate increases.

An objection display device (1) includes an illumination portion for providing an illumination light beam, a light separating portion for separating the illumination light beam into a plurality of color light beams (RGB) for being projected onto a reflective display panel (22), and a projection lens (23). The light separating portion includes a rotating color wheel (16) and a reflector (14) disposed parallel with each other. The rotating color wheel is comprised of a plurality of color filters each selectively transmitting a desired color component and reflecting the other color components of the illumination light beam incident on the color wheel at a predetermined angle. The reflected color components are incident on the reflector and reflected back by the reflector to the rotating color wheel for recycling at a given moment. The color components transmitted by corresponding color filters sequentially exit the color wheel via different light paths as color light beams with different wavelengths.

A reflection-type light control apparatus featuring the improved light utilization efficiency is provided.A light control apparatus is provided with a plurality of pixels arranged two-dimensionally on a substrate. A first reflection layer is formed on the substrate. A light modulating film is provided on the top surface of the first reflection layer. As material for this light modulating film, electro-optical material, such as PLZT, whose refractive index changes according to an electric field applied is selected. A transparent electrode is provided on the top surface of the light modulating film. A second reflection layer is formed on the top surface of the transparent electrode. This second reflection layer is formed of a dielectric multilayer film, which is a stack of alternating first dielectric film and second dielectric film having different refractive indices. The first reflection layer, the light modulating film and the second reflection layer constitute a resonator. The transparent electrode and the first reflection layer form a pair of electrodes, and control the reflectance of a light control apparatus by varying the electric field applied to the light modulating film.

An LED optical assembly for automotive low-beam headlamps, including: a lens, a lens frame, a light source frame assembly, and an LED light source. The lens includes a main lens and a plurality of reflectors. The main lens is located in the front of the LED optical assembly and the reflectors are scattered therearound. At one side of the main lens, four sets of the reflectors, which are symmetrical in shape, are respectively disposed at the left part and the right part thereof, and in a back of the main lens, six sets of the reflectors, which are symmetrical in shape, are respectively disposed at the left part and the right part thereof.

A light source device includes: a first light source (3a) that emits first polarized light of a plurality of colors including different wavelengths; a second light source (3b) that emits second polarized light whose polarization state differs from that of the first polarized light and that includes light of at least one color from among the plurality of colors; and a first color synthesis optical element (1) that synthesizes the first polarized light emitted from the first light source (3a) and the second polarized light emitted from the second light source (3b).