Abstract: A heat generator includes a heat generating member and a temperature compensating member made from different material. The heat generating member includes a heat flow output face for outputing heat flow and five heat flow insulation faces. The temperature compensating member encloses and contacts the heat generating member except the heat flow output face. A heat flow compensating circuit is electrically connected between the temperature compensating member and the heat generating member for maintaining a state of no heat flow flowing between the heat generating member and the temperature compensating member, whereby the heat energy of the heat flow outputing from the heat flow output face is equal to the heat energy of heat generated by the heat generating member.

Abstract: A backlight assembly (100) for providing bright and uniform light beams to illuminate an LCD panel includes a light source (120), a reflector (130), and a diffusion sheet (150). The light source is positioned between the reflector and the diffusion sheet, and the diffusion sheet has at least one diffraction grating (151) formed on a surface thereof facing the light source. The backlight assembly has a simple configuration for providing bright and uniform light beams to illuminate an LCD panel. Furthermore, the diffusion sheet is made of a transparent piezoelectric material. When an electric field is applied on the diffusion sheet by a controlling circuit, the diffusion sheet is induced to deform. Thus the distribution of light intensity can be modulated according to need.

Abstract: A backlight module (20) includes a light guide plate (22), a light source (21), and a reflection plate (23). The light guide plate includes a light incidence surface (221) for receiving light, a light emitting surface (223) for emitting light, and a bottom surface (222). The light source is disposed adjacent the light incidence surface. The reflection plate disposed under the bottom surface includes a base (232), and a reflection layer (233) formed on the base. The reflection layer defines a number of diffraction grating units (231) at an outer surface thereof. Grating constants of the diffraction grating units progressively decrease with increasing distance away from the light incidence surface. This enables the light emitting surface to output highly uniform light. Further, if the process of fabrication of the diffraction grating units fails, only the reflection plate need be discarded. Thus the backlight module has a low mass manufacturing cost.

Abstract: A thermal interface material (40) includes a silver colloid base (32), and an array of carbon nanotubes (22) disposed in the silver colloid base uniformly. The silver colloid base includes silver particles, boron nitride particles and polysynthetic oils. The silver colloid base has a first surface (42), and a second surface (44) opposite to the first surface. The carbon nanotubes are substantially parallel to each other, and extend from the first surface to the second surface. A method for manufacturing the thermal interface material includes the steps of: (a) forming an array of carbon nanotubes on a substrate; (b) immersing the carbon nanotubes in a silver colloid base; (c) solidifying the silver colloid base; and (d) peeling the solidified silver colloid base with the carbon nanotubes secured therein off from the substrate.

Abstract: A light-emitting diode (LED) 110) includes a chip body 113), an encapsulation can 115) surrounding the chip body, and a base 111) supporting the encapsulation can and the chip body thereon. A diffraction grating 117) is provided at a surface of the encapsulation can, and the encapsulation can is made of a piezoelectric material for widening radiation angles of light beams emitted from the chip body. With the diffraction grating and the piezoelectric encapsulation can, light beams from the chip body are diffracted and attain wider radiation angles. A backlight system 100) includes a light guide plate 120), and a number of the above-described LEDs disposed adjacent to the light guide plate. Light beams having wide radiation angles are emitted from the LEDs and enter the light guide plate. This enables a light-emitting surface 122) of the light guide plate to have highly uniform brightness.

Abstract: A light-emitting diode (LED) (10) includes a chip body (103), an encapsulation can (105) surrounding the chip body, and a base (106) supporting the encapsulation can and the chip body thereon. Numerous fluorescent particles (1050) are provided in the encapsulation can. With the fluorescent particles, light beams from the chip body are diffused and attain wider irradiation angles. A backlight system (900) includes a light guide plate (20), and a number of the above-described LEDs disposed adjacent to the light guide plate. Light beams having wide irradiation angles are emitted from the LEDs and enter the light guide plate. This enables a light emitting surface of the light guide plate to have highly uniform brightness.

Abstract: An injection mold (120) includes a stationary mold (121), a movable mold (122), and a core. The movable mold defines a cavity (126). The core is disposed in the cavity of the movable mold opposite from the stationary mold. The stationary mold includes a curved runner (125), and a flared gate (123) having an opening at least half the size of an opening of the cavity. With the combined runner and gate structure, movement of molten resin is slowed, and different portions of the cavity are filled up with molten resin virtually simultaneously. Accordingly, different portions of the molten resin are cooled at the same time, so that the light guide plate has an even density and low stress concentration. The light guide plate can then provide highly uniform brightness.

Abstract: A surface light source (4) includes a light guide plate (2) and a light source (5). The light guide plate has an incident surface (21) and an emitting surface (22). The light source is adjacent to the incident surface of the light guide plate for radiating light beams into the light guide plate through the incident surface. The emitting surface defines a large number of prisms (221), in which the distance (L) separating each two adjacent prisms changes according to an intensity of the light beams received from the light source. In particular, the pitch between two prisms decreases with increasing distance away from the light source. By the cooperation of the prisms and the light source, the surface light source has uniform illumination over the whole emitting surface.

Abstract: A heat sink (11) includes a base (12), a plurality of fins (14) extending from a first surface of the base, and a plurality of carbon nanotubes (18) formed on an opposite second surface (16) of the base. The carbon nanotubes are substantially parallel to each other and substantially perpendicular to the base. A method for manufacturing the heat sink includes the steps of: (a) providing a heat sink preform comprising a base and a plurality of fins extending from a first surface of the base; (b) polishing an opposite second surface of base; (c) depositing a catalyst film on the second surface of the base; and (d) providing a carbon source gas to grow a plurality of carbon nanotubes on the second surface of the base.

Abstract: A light-emitting diode (LED) (10) includes a chip body (103), an encapsulation can (105) surrounding the chip body, and a base (106) supporting the encapsulation can and the chip body thereon. Numerous diffusion structures (1050) are provided on the encapsulation can, and the encapsulation can is made of a piezoelectric material for widening radiation angles of light beams emitted from the chip body. With the diffusion structures and the piezoelectric encapsulation can, light beams from the chip body are diffused and attain wider radiation angles. A backlight system (900) includes a light guide plate (20), and a number of the above-described LEDs disposed adjacent to the light guide plate. Light beams having wide radiation angles are emitted from the LEDs and enter the light guide plate. This enables a light emitting surface of the light guide plate to have highly uniform brightness.

Abstract: A backlight system (10) in accordance with the present invention includes a light guide plate (20) and two light sources (30) disposed adjacent opposite sides of the light guide plate. The light guide plate includes two incident surfaces (21), a light exit surface (22) and a bottom surface (24) opposite to the light exit surface. The bottom surface has a plurality of diffusion units (23) therein, and a reflective film (241) thereon. Diffusion surfaces (25) of the plurality of the diffusion units cooperate with each other to form a curved face for directing light beams to be output from the light exit surface in a predetermined angular range.

Abstract: A method for making a polymer-based rare earth-doped waveguide includes the steps of: providing a substrate (11); spin coating a polymer bottom cladding layer (12) on the substrate; spin coating a core layer (13) comprising a polymer and complex rare earth metal ions, which can be excited to produce a laser, on the bottom cladding layer; using a channel patterning technique with masking and ultraviolet (UV) radiation followed by etching to form at least one channel waveguide (14); and spin coating a polymer top cladding layer (15) over the at least one channel waveguide and exposed portions of the bottom cladding layer. The method includes improving the solubility of rare earth metal ions in a polymer matrix, by forming a complex of each rare earth metal ion with an organic compound. These complexes have higher solubility in a fluorinated polymer, compared with pure rare earth metal ions.

Abstract: A method for manufacturing a mold for a light guide plate includes the steps of: providing a substrate (520); forming a photo-resist film (600) on the substrate; disposing a mask having a predetermined pattern over the substrate, illuminating the photo-resist film through the mask by illuminating rays; developing the photo-resist film to form a photo-resist pattern (640) on the substrate; dry-etching the substrate and the photo-resist pattern simultaneously to form a mold preform; and stripping the residual photo-resist pattern from the patterned substrate to attain the mold (500). The method is highly precise and relatively simple.

Abstract: A planar light source device (100) for a display device includes a light guide plate (120) and pluralities of light emitting diodes (110). The light guide plate has a light incident surface (121). The light emitting diodes are located in the vicinity of the light incident surface. Each light emitting diode has a light emission surface opposite to the light incident surface of the light guide plate, and has a diffraction grating (117) provided on the light emission surface for improving a range of divergence of light beams emitted therefrom.

Abstract: A heat pipe (20) includes a pipe (21), a wick (22), and an operating fluid. The wick is fixedly engaged with an inside wall of the pipe. The operating fluid is sealed in the pipe and soaks the wick. The operating fluid includes a pure liquid, and a plurality of carbon nanocapsules (23) suspended in the pure liquid. The pure liquid can be selected from the group consisting of pure water, ammonia, methanol, acetone and heptane. Each carbon nanocapsule is a polyhedral carbon cluster (231), with a metal (232) having high thermal conductivity filled therein. The operating fluid has high thermal conductivity and uniform operation, and is recyclable with no pollution of the environment. The heat pipe has correspondingly high thermal conductivity.

Abstract: A heat dissipating circulatory system (8) includes a pool (7) for receiving an operating fluid, a pump (3), a heat spreader (2) and a condenser (4). A first pipe (51) interconnects an output end (42) of the condenser and an input end (71) of the pool. A second pipe (52) interconnects an output end (72) of the pool and an input end (31) of the pump. A third pipe (53) interconnects an output end (32) of the pump and an input end (21) of the heat spreader. A fourth pipe (54) interconnects an output end (22) of the heat spreader and an input end (41) of the condenser. The heat spreader includes a fin (13) and a liquid sputtering assembly (1). The liquid sputtering assembly includes a plurality of nozzles (11) and drivers (12). The operating fluid is directly sputtered onto the fin, thereby providing direct heat exchange.

Abstract: A light-emitting diode (LED) (10) includes a chip body (103), an encapsulation can (105) surrounding the chip body, and a base (106) supporting the encapsulation can and the chip body thereon. Numerous particles (1050) are provided in the encapsulation can. With the particles, light beams from the chip body are diffused and attain wider irradiation angles. A backlight system (900) includes a light guide plate (20), and a number of the above-described LEDs disposed adjacent to the light guide plate. Light beams having wide irradiation angles are emitted from the LEDs and enter the light guide plate. This enables a light emitting surface of the light guide plate to have highly uniform brightness.

Abstract: 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.

Abstract: A back light system (2) includes a light guide plate (50). The light guide plate includes an array of prisms (55) formed thereon, and a nano-particle layer (80) formed on the prisms for diffusing light beams propagating therethrough. The nano-particle layer contains a mass of transparent nano-particles with diameters preferably in the range from 30˜100 nm. A material of the particles may be TiO2 (titanium oxide), SiO2 (silicon dioxide), or Al2O3 (aluminum oxide). Each light beam passing through the nano-particle layer is scattered, and most of the scattering occurs over a limited range of angles. The scattered light beams exit the nano-particle layer mostly over the limited range of angles, with a medial direction of propagation in the range of angles being substantially parallel to a viewing direction. The back light system can yield high brightness and uniform luminescence, and is relatively simple in construction and inexpensive.

Abstract: A light-emitting diode (LED) (10) includes a chip body (103), an encapsulation can (105) surrounding the chip body, and a base (106) supporting the encapsulation can and the chip body thereon. Numerous diffusion structures (1050) are provided on the encapsulation can. With the diffusion structures, light beams from the chip body are diffused and attain wider irradiation angles. A backlight system (900) includes a light guide plate (20), and a number of LEDs as per the above. The LEDs are disposed adjacent to the light guide plate. Light beams having wide irradiation angles are emitted from the LEDs and enter the light guide plate. This enables a light exit surface of the light guide plate to have highly uniform brightness.