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: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer. The light diffusion layer is between the first and second transparent layers. The light diffusion layer, the first and second transparent layers are integrally formed. The light diffusion layer includes a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin. The first transparent layer defines a plurality of V-shaped protrusions at an outer surface thereof distalmost from the second transparent layer. The second transparent layer has a plurality of conical frustum protrusions at an outer surface thereof distalmost from the first transparent layer.

Abstract: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer between the first and second transparent layers. The above-described three layers are integrally formed, with the first transparent layer in immediate contact with the light diffusion layer, and the second transparent layer in immediate contact with the light diffusion layer. The first transparent layer defines micro depressions protruding from an outer surface thereof. Each micro depression has at least three side surfaces connected to each other, and a transverse width of each side surface increases along a direction away from the light diffusion layer. The second transparent layer defines conical frustum protrusions at an outer surface thereof.

Abstract: An exemplary optical plate includes a first transparent layer (21), a second transparent layer (23) and a light diffusion layer (22). The first transparent layer includes an outer surface (210) and a plurality of first conical frustum-shaped depressions (211) defined at the outer surface. The second transparent layer includes an outer surface (230) and a plurality of second conical frustum-shaped depressions (231) defined at the outer surface. The first transparent layer, the light diffusion layer, and the second transparent layer are integrally formed, with the first transparent layer in immediate contact with the light diffusion layer, and the second transparent layer in immediate contact with the light diffusion layer. The light diffusion layer includes a transparent matrix resin (221) and a plurality of diffusion particles (222) dispersed in the transparent matrix resin.

Abstract: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer between the first and second transparent layers. The first transparent layer, the light diffusion layer, and the second transparent layer are integrally formed, with the first transparent layer in immediate contact with the light diffusion layer, and the second transparent layer in immediate contact with the light diffusion layer. The first transparent layer defines a plurality of conical frustum protrusions protruding out from an outer surface distalmost from the second transparent layer. The second transparent layer defines a plurality of conical frustum depressions at an outer surface thereof distalmost from the first transparent layer.

Abstract: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer between the first and second transparent layers. The above-described three layers are integrally formed, with the first transparent layer in immediate contact with the light diffusion layer, and the second transparent layer in immediate contact with the light diffusion layer. The first transparent layer defines micro depressions protruding from an outer surface thereof. Each micro depression has at least three side surfaces connected to each other, and a transverse width of each side surface increases along a direction away from the light diffusion layer. The second transparent layer defines conical frustum depressions at an outer surface thereof.

Abstract: An exemplary optical plate includes a first transparent layer (21), a second transparent layer (23) and a light diffusion layer (22). The first transparent layer includes an outer surface (210) and a plurality of first conical frustum protrusions (211) protruding out from the outer surface. The second transparent layer includes an outer surface (230) and a plurality of second conical frustum protrusions (231) formed at the outer surface. The first transparent layer, the light diffusion layer, and the second transparent layer are integrally formed, with the first transparent layer in immediate contact with the light diffusion layer, and the second transparent layer in immediate contact with the light diffusion layer. The light diffusion layer includes a transparent matrix resin (221) and a plurality of diffusion particles (222) dispersed in the transparent matrix resin.

Abstract: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer. The light diffusion layer is between the first and second transparent layers. The light diffusion layer, the first and second transparent layers are integrally formed. The light diffusion layer includes a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin. The first transparent layer defines a plurality of V-shaped protrusions at an outer surface thereof that is distalmost from the second transparent layer. The second transparent layer defines a plurality of spherical depressions at an outer surface thereof that is distalmost from the first transparent layer. A backlight module using the optical plate is also provided.

Abstract: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer. The light diffusion layer is between the first and second transparent layers. The light diffusion layer, the first transparent layer, and the second transparent layer are integrally formed. The light diffusion layer includes a transparent matrix resin, and diffusion particles dispersed in the transparent matrix resin. The first transparent layer defines first spherical depressions at an outer surface thereof that is farthest from the second transparent layer. The second transparent layer defines second spherical depressions at an outer surface thereof that is farthest from the first transparent layer. A backlight module using the optical plate is also provided.

Abstract: An exemplary optical plate (20) includes a first transparent layer (21), a second transparent layer (23), and a light diffusion layer (22). The light diffusion layer and the first and second transparent layers are integrally formed, with each of the first transparent and second transparent layers in immediate contact with the light diffusion layer. The light diffusion layer includes a transparent matrix resin (221), and diffusion particles (222) dispersed in the transparent matrix resin. The first transparent layer includes spherical depressions (211) at an outer surface (210) thereof that is farthest from the second transparent layer. The second transparent layer includes protrusions (231) at an outer surface (230) thereof that is farthest from the first transparent layer. Each protrusion is shaped in the form of a square pyramid. An exemplary direct type backlight module (200) using the optical plate is also provided.

Abstract: An exemplary optical plate includes a first transparent layer (21), a second transparent layer (23) and a light diffusion layer (22). The first transparent layer includes an outer surface (210) and a plurality of semi-spherical depressions (211) protruding out from the outer surface. The second transparent layer includes an outer surface (230) and a plurality of conical frustum-shaped depressions (231) defined at the outer surface. The first transparent, the light diffusion layer, and the second transparent are integrally formed, with the first transparent layer in immediate contact with the light diffusion layer, and the second transparent layer in immediate contact with the light diffusion layer. The light diffusion layer includes a transparent matrix resin (221) and a plurality of diffusion particles (222) dispersed in the transparent matrix resin.

Abstract: An exemplary optical plate (20) includes a first transparent layer (21), a second transparent layer (23) and a light diffusion layer (22). The light diffusion layer is between the first and second transparent layers. The light diffusion layer, the first and second transparent layers are integrally formed. The light diffusion layer includes a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin. The first transparent layer includes a plurality of spherical protrusions (211) at an outer surface (210) thereof that is distalmost from the second transparent layer. The second transparent layer includes a plurality of depressions (231) at an outer surface (230) thereof that is distalmost from the first transparent layer. Each depression is shaped in the form of an inverted square pyramid. A direct type backlight module using the optical plate is also provided.

Abstract: An exemplary optical plate (20) includes a transparent layer (21) and a light diffusion layer (22). The transparent layer includes a light input interface (211), a light output surface (212) opposite to the light input interface, and a plurality of spherical protrusions (213) protruding out from the light output surface. The light diffusion layer is integrally formed with the transparent layer adjacent to the light input interface. The light diffusion layer includes a transparent matrix resins (221) and a plurality of diffusion particles (223) dispersed in the transparent matrix resins. A method for making the optical plate is also provided.

Abstract: An exemplary optical plate (20) includes a first transparent layer (21), a second transparent layer (23) and a light diffusion layer (22). The light diffusion layer, the first and second transparent layers are integrally formed, with the first transparent layer and the second transparent layer in immediate contact with the light diffusion layer. The light diffusion layer includes a transparent matrix resin (221) and a plurality of diffusion particles (222) dispersed in the transparent matrix resin. The first transparent layer includes a plurality of conical frustum protrusions (211) at an outer surface thereof that is distalmost from the second transparent layer. The second transparent layer includes a plurality of spherical depressions (231) at an outer surface thereof that is distalmost from the first transparent layer. A direct type backlight module using the optical plate is also provided.

Abstract: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer. The light diffusion layer is between the first and second transparent layers. The light diffusion layer, the first and second transparent layers are integrally formed. The light diffusion layer includes a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin. The first transparent layer includes a plurality of V-shaped protrusions at an outer surface distalmost from the second transparent layer. The second transparent layer includes a plurality of spherical protrusions at an outer surface distalmost from the first transparent layer.

Abstract: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer. The light diffusion layer is between the first and second transparent layers. The light diffusion layer, the first and second transparent layers are integrally formed. The light diffusion layer includes a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin. The first transparent layer includes a plurality of elongated V-shaped protrusions at an outer surface thereof that is distalmost from the second transparent layer. The second transparent layer includes a plurality of micro-recesses at an outer surface thereof that is distalmost from the first transparent layer. Each micro-recess is a frustum of an inverted pyramid in shape. A direct type backlight module using the optical plate is also provided.

Abstract: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer. The light diffusion layer is between the first and second transparent layers. The light diffusion layer, the first and second transparent layers are integrally formed. The light diffusion layer includes a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin. Both the first and second transparent layers define a plurality of spherical protrusions on an outer surface thereof distalmost from the light diffusion layer respectively. A method for making the optical plate is also provided. In addition, a direct type backlight module using the optical plate is also provided.

Abstract: An exemplary optical plate includes a first transparent layer (21), a second transparent layer (23) and a light diffusion layer (22). The first transparent layer includes an outer surface (210) and a plurality of semi-spherical protrusions (211) protruding out from the outer surface. The second transparent layer includes an outer surface (230) and a plurality of semi-spherical depressions (231) defined at the outer surface. The first transparent, the light diffusion layer, and the second transparent are integrally formed, with the first transparent layer in immediate contact with the light diffusion layer, and the second transparent layer in immediate contact with the light diffusion layer. The light diffusion layer includes a transparent matrix resin (221) and a plurality of diffusion particles (222) dispersed in the transparent matrix resin.

Abstract: An optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer between the first and second transparent layers. The above-described three layers are integrally formed, with the first transparent layer in immediate contact with the light diffusion layer, and the second transparent layer in immediate contact with the light diffusion layer. The first transparent layer defines many of micro protrusions protruding from an outer surface thereof. Each micro protrusion has at least three flat side surfaces connected to each other, and a transverse width of each side surface decreases along a direction away from the light diffusion layer. The second transparent layer defines many of V-shaped protrusions at an outer surface thereof.