Abstract: An exemplary prism sheet includes a transparent main body. The transparent main body includes a first surface and a second surface. The first surface and the second surface are on opposite sides of the main body. The first surface of transparent main body defines a plurality of spherical depressions. The second surface defines a plurality of rectangular structures. Each rectangular structure defines four adjacent triangular pyramid depressions.

Abstract: An exemplary prism sheet includes a transparent main body. The transparent main body includes a first surface and a second surface. The first surface and the second surface are on opposite sides of the main body. The first surface of transparent main body defines a plurality of first elongated arc-shaped grooves and a plurality of second elongated arc-shaped grooves. The first elongated arc-shaped grooves intersect with the second elongated arc-shaped grooves. The second surface defining a plurality of rectangular structures. Each rectangular structure defining four adjacent triangular pyramid depressions.

Abstract: An exemplary prism sheet includes a first surface and a second surface opposite the first surface. The first surface defines a plurality of elongated V-shaped grooves, and the elongated V-shaped grooves are parallel to each other. The second surface defines a plurality of parallelogram microstructures. Each parallelogram microstructure defines four adjacent triangular pyramid depressions.

Abstract: An exemplary optical plate includes at least one transparent plate unit. The transparent plate unit includes a light output surface, a bottom surface, a plurality of enclosing V-shaped protrusions, a plurality of microstructures and at least one lamp-receiving portion. The light output surface is opposite to the bottom surface. The enclosing V-shaped protrusions are formed on the bottom surface. The microstructures are formed on the light output surface. The lamp-receiving portion is defined in the bottom surface. A backlight module using the present optical plate is also provided.

Abstract: An edge type backlight module includes a diffusion plate, at least a lamp-fixing unit, at least a light source and a reflective plate. The lamp-fixing unit is disposed under one edge of the diffusion plate. The lamp-fixing unit includes an inner surface facing the inner area underneath the diffusion plate, an outer surface opposite to the inner surface, and a plurality of fin structures defined on the outer surface. The light source is fixed on the inner surface of the lamp-fixing unit. The reflective plate is disposed adjacent the lamp-fixing unit and under the diffusion plate, facing the light source. Light rays emitted from the light source being uniformly reflected toward the diffusion plate by the reflective plate. The present backlight module has a thin body and also has a good heat dissipation capability.

Abstract: An exemplary optical plate (20) includes a transparent plate (21) and a light diffusion layer (22). The transparent plate includes a light output surface (212), a light input surface (211) opposite to the light output surface, and a plurality of elongated recessed portions (213) formed at the light input surface. The light diffusion layer is coated in the elongated recessed portions. The light diffusion layer and the light input surface cooperatively define a flat surface. A backlight module using the present optical plate is also provided. The present backlight module using the optical plate can have a thin body with a good optical performance.

Abstract: An exemplary prism sheet includes a main body having a surface. The surface defines a plurality of first V-shaped micro-protrusions and second V-shaped micro-protrusions thereon. Each of the first V-shaped micro-protrusions extends along a first curved direction. Each of the second V-shaped micro-protrusions extends along a second curved direction. The first V-shaped micro-protrusions intersect with the second V-shaped micro-protrusions. The present prism sheet and the liquid crystal display device using the same can efficiently decrease moire pattern interference between the prism sheet and the pixel pitch of LCD panel.

Abstract: An exemplary light emitting diode (30) includes a light output unit (31), an optical lens (33) and a reflective film (35). The optical lens includes a light input surface (331) facing the light output unit, a top interface (333) opposite to the light input surface, and a light output surface (335) between the light input surface and the top interface. The reflective film is integrally formed on and in immediate contact with the top interface of the optical lens. The reflective film is made of a transparent resin matrix material dispersed with a plurality of reflective particles. A method for making the light emitting diode is also provided.

Abstract: A lamp-fixing device includes a base and at least one receiving unit. The receiving unit is formed on the base. The receiving unit includes two opposite protruding walls extending perpendicular out from the base. The two protruding walls and the base cooperatively define a receiving space used to receive one end of a lamp tube with an electrode holder. The two protruding walls and the base each define a heat dissipation hole therein of the receiving space.

Abstract: An exemplary optical plate includes at least one transparent plate unit. The transparent plate unit includes a light output surface, a bottom surface, a plurality of microstructures, and at least a lamp-receiving portion. The bottom surface is opposite to the light output surface. The microstructures are formed at the light output surface and the bottom surface respectively. Each microstructure has circular cross-sections taken along a plane parallel to its base surface thereof, a diameter of the circular cross-sections decreasing along a direction away from its base surface thereof. The lamp-receiving portion is defined in the bottom surface. A backlight module using the present optical plate is also provided.

Abstract: An exemplary optical plate (23) includes a transparent plate portion 231, a plurality of brightness enhancement structures (232) and a light diffusion layer (233). The transparent plate portion has a light input interface (2311), and a light output surface (2312) opposite to the light input interface. The brightness enhancement structures are formed at the light output surface. The light diffusion layer are formed on the light input interface, which includes a transparent resin matrix material and a plurality of first light diffusion particles and a plurality of second light diffusion particles dispersed in the transparent resin matrix material uniformly. A refractive index of the second light diffusion particles is greater than that of the first light diffusion particles. An exemplary method for manufacturing the optical plate is also provided. The optical plate and an associated backlight module (20) can increase the light energy utilization ratio.

Abstract: An exemplary optical plate is used in a backlight module having a frame. The optical plate includes a main body and one bracket extension. The main body has a light input surface, and a light output surface opposite to the light input surface. The bracket extension extends from one end of the main body for fixing the optical plate to the frame. A backlight module using the optical plate is also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The transparent main body has a surface. A plurality of first elongated micro-protrusions and second elongated micro-protrusions protrude from the surface of the main body. Each of the first elongated micro-protrusions extends along a first direction. Widths and heights of each of the first elongated micro-protrusions vary along the first direction. Each of the second elongated micro-protrusions extends along a second direction that intersects with the first direction. Widths and heights of each of the second elongated micro-protrusions vary along the second direction. A method for making the prism sheet and a liquid crystal display device using the prism sheet are also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The main body includes a first surface and a second surface. The first surface and the second surface are on opposite sides of the main body. The first surface defines a plurality of elongated, arc-shaped depressions. Each elongated, arc-shaped depression has a varying depth forming a first smooth wavy pattern. A plurality of elongated, arc-shaped protrusions protrudes from the second surface. Each elongated, arc-shaped protrusion has a varying height forming a second smooth wavy pattern. A backlight module using the present prism sheet is also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The transparent main body has a surface. A plurality of elongated protrusions protrude from the surface of the main body. Each of the elongated protrusions extends along a first direction. A width and a height of one or more elongated protrusions vary along the first direction. Methods for making the prism sheet are also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The main body includes a first surface and a second surface. The first surface is opposite to the second surface. A plurality of micro-depressions are defined in the first surface. A plurality of elongated arc-shaped protrusions are formed on the second surface. Each micro-depression is defined by four connecting sidewalls. A transverse width of each sidewall of each micro-depression progressively decreases with increasing distance from the second surface. A backlight module using the present prism sheet is also provided.

Abstract: An exemplary frame used in a backlight module having a plurality of optical elements includes a bottom frame, a plurality of fixing members, and two pre-assembled members. Each pre-assembled member has a latching portion. The optical elements are stacked together and fixed to the latching portions of the pre-assembled members. The pre-assembled members are fixed to the bottom frame with the fixing members. A backlight module using the present frame is also provided.

Abstract: A light diffusion plate according to a preferred embodiment includes a transparent substrate and a light diffusion layer formed on a surface of the transparent substrate. The light diffusion layer includes a transparent resin matrix, a plurality of first particles, and a plurality of second particles. The first particles and the second particles are dispersed in the transparent resin matrix. A diameter of each first particle is in a range from 5 microns to 60 microns. A diameter of each second particle is less than 0.5 microns. A backlight module using the present light diffusion plate is also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The main body includes a first surface, a second surface opposite to the first surface, a plurality of elongated, curved micro-depressions formed in the first surface, and a plurality of elongated, curved micro-protrusions protruding out from the second surface. The micro-depressions extend along first imaginary circular arcs having a same curvature. The micro-protrusions extend along second arcs having a same curvature. A backlight module using the present prism sheet is also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The transparent main body includes a surface and a plurality of spherical micro-depressions integrally formed in the surface. A backlight module using the present prism sheet is also provided.