Abstract: A light guide plate (10) includes a transparent plate (20), a plurality of diffusing protrusions (30) and a plurality of dots (40). The transparent plate includes an emitting surface (21), and a bottom surface (23) opposite to the emitting surface. The diffusing protrusions are distributed on the emitting surface of the transparent plate, and are integrated with the transparent plate. The dots are distributed on the bottom surface of the transparent plate. The light guide plate provides high emitting brightness and uniformity. The diffusing protrusions can diffuse light beams emitting from the emitting surface of the transparent plate, in order to achieve a plane light source having even brightness. Moreover, the dots on the bottom surface can scatter and reflect incident light beams, so as to totally eliminate internal reflection of light beams and make the light beams evenly emit from the emitting surface.

Abstract: A polarized light source system (20) includes a light guide plate (22), a light source (24), a lamp cover (25), a quarter wave plate (23), an upward prism plate (26) and a downward prism plate (28). The light guide plate defines an optical inputting surface and an optical outputting surface interconnecting therewith. The light source and the lamp cover are stationed next to the optical inputting surface. The upward prism plate stationed next to the optical outputting surface defines a plurality of upward micro-prisms (262) on a surface opposite thereto. The downward prism plate stationed next to the upward prism plate includes a brightness enhancing film (284), and a plurality of downward micro-prisms (282) on a surface facing the upward prism plate. The upward and downward micro-prisms engaged with each other. The quarter wave plate includes a reflective film on a backing surface.

Abstract: An optical attenuator (10) includes: an optical splitter (11), a collimator (12), two detectors (51, 52), a first and second reflectors (21, 22), an attenuating element (3) and a driving device (4). The optical splitter includes a ferrule (112) and a GRIN (graded index) lens (113). The collimator is similar to the optical splitter. Input optical signals are transmitted from an input fiber (110) through the optical splitter and are then directed to the first reflector. The optical signals reflected by the first reflector pass through the attenuating element and are subsequently reflected to the collimator by the second reflector. The two detectors receive sampling signals via an input and an output sampling fibers (111, 112). The driving device can drive the attenuating element in response to the attenuation ratio coming from the two detectors.

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 liquid crystal display (3) in accordance with one embodiment of the present invention includes a liquid crystal panel and a backlight module (36). The liquid crystal panel has a reflective polarizing element (342). The backlight module has a light source (361), a light guide plate (362), a reflector (365), and a quarter-wave plate (366). The light source is disposed adjacent to the light guide plate, and the reflector, the light guide plate and the quarter-wave plate are stacked together in order. The liquid crystal panel is located on the backlight module, and the reflective polarizing element of the liquid crystal panel faces toward the quarter-wave plate of the backlight module. The liquid crystal display 3 has a high brightness since light energy is efficiently used.

Abstract: A light guide plate (2) into which light beams are introduced from a light source (41) includes an incident surface (20) receiving the light beams from the light source; a light emitting surface (22) transmitting light beams outwardly; a bottom surface (21) opposite the light emitting surface for reflecting the light beams to the light emitting surface; and a plurality of sidewalls (24, 26, 28) perpendicular to the light emitting surface. The sidewalls have frosted surfaces for reflecting the light beams to assure output of the light beams through the light emitting surface.

Abstract: The present invention provides a surface light source (6) using a light guide plate (2) to illuminate a liquid crystal display. The light guide plate comprises a light incident surface (21), a light-emitting surface (22) perpendicular to the light incident surface, a bottom surface (23) opposite to the light-emitting surface, and a plurality of side surfaces. An anti-reflective coating is formed on the light incident surface and the light-emitting surface. A reflective coating is formed on the bottom surface and at least one of the side surfaces. The light guide plate provides a high luminace output for the liquid crystal display.

Abstract: A backlight system (300) includes a light guide plate (3024), a reflection plate (3023), a light source (3021) disposed at one side of the light guide plate, a diffusion plate (3025) and a reflection polarizer (3027), which lets light polarized in one certain direction pass, and reflects light polarized in a polarization direction perpendicular to the said certain direction. The reflection plate, the light guide plate, the diffusion plate, and the reflection polarizer are stacked up one on top of the other. A plurality of prisms (1) is disposed on a surface of the diffusion plate, which forms a plurality of V-shaped grooves (not labeled).

Abstract: A backlight system of the present invention includes a light guide plate (300) and a light source (310) disposed at one side of the light guide plate. The light guide plate has an incident surface (321) for receiving light from the light source, a bottom surface (323), and a light emitting surface (322) for emitting light therethrough. A plurality of prisms (350), each in a shape of a pyramid, are formed on the light emitting surface. A plurality of diffusion dots (324) are formed on the bottom surface.

Abstract: A light guide plate (20) includes a light input end (21), a light output face (23) adjacent the light input end, and a back face (22) opposite to the light output face. A plurality of fine dots (26) are formed on the back face arranged in a uniform, rectangular array. The dots in a same column have a same size. The dots in a same row increase in size. A radius r of the dots in each row thereof varies as a function of a column number X of a given dot, in accordance with the formula: r=A+BX+CX2+DX3+EX4+FX5, wherein: the column number X varies in consecutive whole numbers from a value of one for the column nearest the light input end to a maximum value for the column most distal from the light input end; and A, B, C, D, E, and F are constants.

Abstract: A light guide plate (3) includes a parallelepiped block. The block includes an input surface (31) for receiving light beams irradiated from a light source; two side surfaces perpendicularly adjoining the incident surface; an output surface (32) perpendicularly adjoining the incident surface and the side surfaces; and a bottom surface (33) opposing to the output surface. An array of prisms (34) is integrally formed on the output surface. Each prism is shaped as a square pyramid. All the prisms have a same size and are arranged contiguously with each other. Alternatively, the light guide plate may be a wedge-shaped block (3′). A rectangular array of prisms (34′) is integrally formed on an output surface (32′) thereof. Each prism is shaped as a square pyramid. The prisms are arranged contiguously with each other, and sizes of the prisms gradually decrease from a thick end to a thin end of the block.

Abstract: An optical isolator includes a first optical collimator, an isolated core, a second optical collimator and an outer tube. The first and second collimators and the isolated core are accommodated in the outer tube. The second collimator has a long sleeve which entirely accommodates the isolated core. The isolated core includes a first polarizer, a Faraday rotator crystal, and a second polarizer positioned in sequence within a toroidal magnetic core. An axial length of the toroidal magnetic core is equal to or slightly less than an overall length of the two polarizers and the rotator crystal. The two polarizers and the rotator crystal are sized such that an overall diameter of the isolated core is less than an inner diameter of the long sleeve. The magnetic core is glued within the long sleeve.

Abstract: An optical isolator includes a first optical collimator, a first birefringent crystal, a Faraday rotator, a second birefringent crystal and a second optical collimator. The first and second collimators have the same structure and configuration. Each first and second collimator includes a ferrule, an optical fiber retained in the ferrule, and a collimating lens, all of which are secured in a tube. The first and second birefringent crystals are respectively fixed to the first and the second collimators. The Faraday rotator is stationed between the first and second collimators, and fixed onto an end of the first collimator. In assembly, the first and second collimators and the Faraday rotator are all secured in a stainless steel outer tube. The second collimator is rotated within the outer tube until correct relative alignment of optical axes of the birefringent crystals is attained.

Abstract: An optical attenuator (10) includes: an optical splitter (11), a collimator (12), two detectors (51, 52), a first and second reflectors (21, 22), an attenuating element (3) and a driving device (4). The optical splitter includes a ferrule (112) and a GRIN (graded index) lens (113). The collimator is similar to the optical splitter. Input optical signals are transmitted from an input fiber (110) through the optical splitter and are then directed to the first reflector. The optical signals reflected by the first reflector pass through the attenuating element and are subsequently reflected to the collimator by the second reflector. The two detectors receive sampling signals via an input and an output sampling fibers (111, 112). The driving device can drive the attenuating element in response to the attenuation ratio coming from the two detectors.

Abstract: An optical attenuator (8) includes: an input port (1), an output port (4), a fixed reflector (2), a movable reflector (3), two detecting means (6,7) and a driving device (5). The input port includes a first collimator (13) and a filter (10) attached to the first collimator. The output port includes a second collimator (41) and a splitter (42) connected to the second collimator. Input signals are transmitted from an input fiber (11) through the first collimator and then pass through the filter. The signals passing through the filter are directed by the fixed and the movable reflectors to the second collimator. The angular position of the movable reflector, which is driven by the driving device, determines the proportion of the signals reflected by the reflectors that are received by the second collimator, which determines the size of the output signals transmitted in the output fiber (421).

Abstract: An optical isolator includes a first optical collimator, a first birefringent crystal, a Faraday rotator, a second birefringent crystal and a second optical collimator. The first and second collimators have the same structure and configuration. Each first and second collimator includes a ferrule, an optical fiber retained in the ferrule, and a collimating lens, all of which are secured in a tube. The first and second birefringent crystals are respectively fixed to the first and the second collimators. The Faraday rotator is stationed between the first and second collimators, and fixed onto an end of the first collimator. In assembly, the first and second collimators and the Faraday rotator are all secured in a stainless steel outer tube. The second collimator is rotated within the outer tube until correct relative alignment of optical axes of the birefringent crystals is attained.

Abstract: An optical isolator (10) comprises two similar optical collimators (20), an isolated core (30) and a holder (40). The isolated core comprises a first birefringent crystal (31), an optical nonreciprocal device (33) and a second birefringent crystal (32). The holder has a cylindrical configuration and is formed from metallic material. The holder defines two holes (41) in opposite ends thereof. The collimators are fixed in the two holes, respectively. Three slots (45, 47, 49) are defined in a middle of the holder. The first birefringent crystal, the nonreciprocal device and the second birefringent crystal are respectively fixed into the three slots.

Abstract: An optical isolator comprises a first collimator (10), an isolating unit (60), a second collimator (20) and an outer metallic holder (40). Each first and second collimator has a sleeve (12, 22), and the sleeve of the second collimator is longer than the sleeve of the first collimator. The isolating unit is stationed between the first and second collimators. The isolating unit comprises a first polarimeter (61), a polarized rotary crystal (62), a second polarimeter (63), and a magnetic ring (64). A length of the magnetic ring is slightly less than or equal to a combined length of the first and second polarimeters and the polarized rotary crystal. The magnetic ring is glued to an end surface of an inmost end of the sleeve of the second collimator. A subassembly of the first collimator, the isolating unit and the second collimator is received in the outer metallic holder.

Abstract: An optical isolator includes a first optical collimator, an isolated core, a second optical collimator and an outer tube. The first and second collimators and the isolated core are accommodated in the outer tube. The second collimator has a long sleeve which entirely accommodates the isolated core. The isolated core includes a first polarizer, a Faraday rotator crystal, and a second polarizer positioned in sequence within a toroidal magnetic core. An axial length of the toroidal magnetic core is equal to or slightly less than an overall length of the two polarizers and the rotator crystal. The two polarizers and the rotator crystal are sized such that an overall diameter of the isolated core is less than an inner diameter of the long sleeve. The magnetic core is glued within the long sleeve.