Abstract: The invention provides a diffusion plate and a backlight module. The backlight module includes pluralities of light sources, a reflector and a first diffusion plate. The light sources, which are disposed in the reflector, are spatially arranged. The first diffusion plate is disposed on the light sources. There are pluralities of bar-shaped first patterns and second patters, which are arranged in the alternating way, disposed on the emission surface of the first diffusion plate. The contours of first patterns and second patterns are arc shaped. The height of first patterns is H1, and the width is W1. The height of second patterns is H2, and the width is W2. The value of H1/W1 is between 0.4 and 1. The ratio of H2/W2 versus H1/W1 is between 0.6 and 0.9.

Abstract: A diffusion-plates assembly and a direct-type backlight module assembly are provided. The diffusion-plates assembly includes a first diffusion plate and a second diffusion plate. There are pluralities of first microstructures on the emergent surface of the first diffusion plate, the first microstructures is for condensing light. The thickness of the first diffusion plate is above 0.4 mm, and the transmittance of the first diffusion plate is above 90%. The second diffusion plate is placed over or under the first diffusion plate, The thickness of the second diffusion plate is above 0.4 mm, and the transmittance of the second diffusion plate is 50˜90. Said diffusion-plates assembly is used in the direct-type backlight module assembly.

Abstract: The invention provides a diffusion plate and a diffusion plate assembly. The diffusion plate is made from transparent material. Pluralities of bar-type patterns are disposed on the emission surface of the diffusion plate. The outline of these patterns has a first curve and a second curve. The protruding direction of the first curve and the second curve are inversed. The second curve is an arc whose radius curvature is between 0.05 mm and 0.3 mm.

Abstract: An backlight is provided, the backlight includes a case, pluralities of light sources, pluralities of needles, pluralities of supporting portions, a first optical sheet, a second optical sheet, and pluralities of first microstructures. The light sources are disposed inside the case, the needles are disposed on the bottom surface of the case, and the supporting portions are disposed on the needles. The first optical sheet is supported on the top of the needles. The second optical sheet placed under the first optical sheet has pluralities of holes, and the needles penetrate the holes. The second optical sheet is supported on the supporting portions. The first microstructures are disposed on the first optical sheet or on the second optical sheet to provide light condensing function.

Abstract: An optical sheet with better brightness-enhancing effectiveness is provided. The optical sheet includes a substrate and pluralities of microstructures disposed on the substrate. The microstructures are spaced from one another at a distance d. The cross-section of the microstructure is formed in a triangle which has a base length D. Wherein d and D satisfy the following equation: 0<d/(d+D)0.61.

Abstract: A diffusion-plates assembly and a direct-type backlight module assembly are provided. The diffusion-plates assembly includes a first diffusion plate and a second diffusion plate. There are pluralities of first microstructures on the emergent surface of the first diffusion plate, the first microstructures is for condensing light. The thickness of the first diffusion plate is above 0.4 mm, and the transmittance of the first diffusion plate is above 90%. The second diffusion plate is placed over or under the first diffusion plate, The thickness of the second diffusion plate is above 0.4 mm, and the transmittance of the second diffusion plate is 50˜90. Said diffusion-plates assembly is used in the direct-type backlight module assembly.

Abstract: A direct type backlight module (200) includes a substrate (231), a diffusion sheet (24) disposed above the substrate, a plurality of spacers (21) and a plurality of light sources (22). The spacers are disposed between the substrate and the diffusion sheet. Each spacer includes a bottom surface (211) contacting with the substrate. A groove (2114) is defined in the bottom surface, and a light incident surface (2112) is defined on inner surface of the groove. A pair of wings is disposed on two sides of the bottom surface for supporting the diffusion sheet. Each wing includes an outer side surface and an inner side surface, and a transflective film is formed on the inner side surfaces of the wing. The light sources are respectively disposed in the grooves.

Abstract: A light guide (20) for illuminating keys of a keyboard or keypad of a portable electronic device, includes an array of apertures (22) and a groove (21) at one end of the light guide. The apertures are configured to illuminate the keys via a light source (10). The light source is disposed adjacent to the groove. A peripheral wall around each aperture is configured partially as a reflecting surface, and partially as a transmitting surface. The reflecting angle of the reflecting surface is larger than a critical total internal reflection angle so as to transfer the light farther. The light guide has a desired uniform light by means of a light source. This provides the portable electronic device consuming little power.

Abstract: A direct backlight module comprises a reflecting cover, several light sources disposed inside the reflecting cover, a base plate disposed above the light sources, and a microstructure formed on a light-ejecting surface or a light-injecting surface of the base plate. By using the reflecting cover, the base plate, and the microstructure, the half viewing angle can be confined and the intensity at 0° viewing angle can be obviously increased. In addition, the advantages including high light transmission rate, promoted brightness and uniform light beams can be provided by using the above-mentioned structures.

Abstract: A diffusion plate having a surface microstructure comprises a plate and at least one microstructure, wherein the plate is made of a light-transmitting polymer having a UV absorbent and several diffusion particles doped therein. The microstructure is formed on at least one surface of the plate. By the use of the above-mentioned structure, the present invention can promote the diffusion capability of the diffusion plate and improve the diffusion plate's ability to cover the lamps.

Abstract: A high uniformity diffuser is provided, wherein a light emission surface of the diffuser is added with prismatic lenses, such that a passage of light is changed through refraction or reflection caused when the light of lamps passes through the lens, in order to achieve an effect of scattering the light.

Abstract: A back light system (2) includes a light guide plate (20) and light sources (21). The light guide plate includes an optical output surface (203), a bottom surface (202) opposite to the output surface, and optical input surfaces (201) between the output and bottom surfaces. The light sources are positioned adjacent the input surfaces respectively. A thickness of a middle of the light guide plate is less than a thickness of a periphery of the light guide plate. In operation, light beams from two opposite of the light sources provide ample optical energy to a middle area of the output surface. In addition, a total optical energy at peripheral areas of the output surface is the same as or similar to a total optical energy at the middle area of the output surface. Thus, the back light system provides very high and highly uniform brightness for an associated LCD.

Abstract: A light guide plate includes an emitting surface; a reflective surface opposite to the emitting surface; an incident surface interconnecting with the emitting surface and the reflective surface. A plurality of ridges are formed on the reflective surface. Each ridge has a first base angle and a second base with respect to the reflective surface. The first base angle closest to the incident surface is in a range from about 86 degrees to 90 degrees. The second base angle furthest from the incident surface is in a range from about 41.8 degrees to 45.8 degrees. A backlight module using the light guide plate is also provided. The present light guide plate and a backlight module using the same can efficiently increase light brightness.

Abstract: A direct type backlight module (200) includes a substrate (231), a diffusion sheet (24) disposed above the substrate, a plurality of spacers (21) and a plurality of light sources (22). The spacers are disposed between the substrate and the diffusion sheet. Each spacer includes a bottom surface (211) contacting with the substrate. A groove (2114) is defined in the bottom surface, and a light incident surface (2112) is defined on inner surface of the groove. A pair of wings is disposed on two sides of the bottom surface for supporting the diffusion sheet. Each wing includes an outer side surface and an inner side surface, and a transflective film is formed on the inner side surfaces of the wing. The light sources are respectively disposed in the grooves.

Abstract: A light guide for illuminating keys of a keyboard or keypad of a portable electronic device includes an array of apertures, at least one groove and at least a protrusion. The apertures are defined in the light guide and are configured to illuminate the keys via at least a light source. The groove is disposed in one end of the light guide for receiving light from the light source. The light guide can provide a desired uniform illumination by means of fewer light sources, and can improve optical uniformity by eliminating the bright areas occurring adjacent to the light sources.

Abstract: A light guide (20) for illuminating keys of a keyboard or keypad of a portable electronic device, includes an array of apertures (22) and a groove (21) at one end of the light guide. The apertures are configured to illuminate the keys via a light source (10). The light source is disposed adjacent to the groove. A peripheral wall around each aperture is configured partially as a reflecting surface, and partially as a transmitting surface. The reflecting angle of the reflecting surface is larger than a critical total internal reflection angle so as to transfer the light farther. The light guide has a desired uniform light by means of a light source. This provides the portable electronic device consuming little power.

Abstract: A liquid crystal display device (20) includes two liquid crystal display panels (25, 26) and a backlight module sandwiched between the two liquid crystal display panels. The backlight module includes a first light guide plate (23), a second light guide plate (24), a light source (21) disposed adjacent to the first and second light guide plates, and a double-sided reflecting plate (22) sandwiched between the first and second light guide plates. The liquid crystal display device includes the double-sided reflecting plate, which is sandwiched between the first and second light guide plates, and can reflect light beams from the light source toward the first and second light guide plates. The first and second light guide plates, which are pressuredly pressed together by molds with the reflecting plate to form the backlight module, are two independent optical members, and do not affect each other. Therefore, the liquid crystal display device has good display quality.

Abstract: A back light system (2) includes a light guide plate (20) and light sources (21). The light guide plate includes an optical output surface (203), a bottom surface (202) opposite to the output surface, and optical input surfaces (201) between the output and bottom surfaces. The light sources are positioned adjacent the input surfaces respectively. A thickness of a middle of the light guide plate is less than a thickness of a periphery of the light guide plate. In operation, light beams from two opposite of the light sources provide ample optical energy to a middle area of the output surface. In addition, a total optical energy at peripheral areas of the output surface is the same as or similar to a total optical energy at the middle area of the output surface. Thus, the back light system provides very high and highly uniform brightness for an associated LCD.

Abstract: A backlight module (2) includes a frame (20), a light source (22) and a light guide plate(21). The light guide plate has a light-emitting surface (211), an incident surface (212), and a bottom surface. The frame accommodates the light guide plate and the light source. The light guide plate is integrated with the frame, because it is made from ultraviolet curable glues filled into the frame. The backlight module is simple, compact, and inexpensive to make.

Abstract: A backlight system (100) in accordance with the present invention includes a plurality of light sources (110) for emitting light beams and a light guide plate (120) for receiving the light beams emitted by the light sources. The light guide plate includes a light input surface (121) and a light output surface (122) joining the light input surface. The light input surface has a number of recessed portions (124) therein. The light beams are refracted and diffused by the recessed portions, and are then transmitted through the light guide plate to be emitted with a high degree of uniformity through the light output surface.