Abstract: A brightness enhancement sheet including a light transmissive substrate, a plurality of strip prisms, and a plurality of protruding structures is provided. The light transmissive substrate has a first surface and a second surface opposite to the first surface. The strip prisms are disposed on the first surface. Each of the strip prisms has two prism surfaces, and a junction of the two prism surfaces forms a crest line, and a valley line is formed between each of the two adjacent strip prisms. Each of the protruding structures has two wing portions. The two wing portions are respectively disposed on two prism surfaces of the corresponding strip prism. A junction of the two wing portions forms a protruding end. The protruding end protrudes from the crest line of the corresponding strip prism. Each of the wing portions extends from the protruding end to the valley line.

Abstract: A brightness enhancement film including a light transmissive substrate, convex lens portions, concave lens portions, and a reflective layer is provided. The light transmissive substrate has a first surface and a second surface opposite to the first surface. The convex lens portions are disposed on the first surface. Each of the convex lens portions has a curved convex surface facing away from the light transmissive substrate. The concave lens portions are disposed on the first surface. The convex lens portions and the concave lens portions are alternately arranged. Each of the concave lens portions has a curved concave surface facing away from the light transmissive substrate. A wavy continuous curve surface is formed by the curved convex surfaces and the curved concave surfaces. The reflective layer is disposed on the second surface and has light passing openings respectively on the optical axes of the convex lens portions.

Abstract: A screen of a projector having a substrate and a plurality of asymmetric optical structures is provided. There is a plurality of light absorbing zones and a plurality of reflective zones alternatively disposed on a surface of the substrate facing the projector. The asymmetric optical structures are disposed on the surface of the substrate and correspond to the reflective zones, respectively. The asymmetric optical structure has a first curved surface and a second curved surface, and the first curved surface protrudes toward the projector for converging an incident light from the projector on the reflective zone, and the second curved surface is disposed at a side of the first curved surface away from the projector for refracting a reflective light from the reflective zones toward the normal direction of the surface of the substrate.

Abstract: A backlight module includes a lighting unit and a brightness enhancement sheet. The brightness enhancement sheet is disposed beside the lighting unit. The brightness enhancement sheet includes a light-transmissive substrate, a plurality of lenses, a reflective layer, and a diffusion layer. The light-transmissive substrate has a first surface and a second surface opposite to the first surface. The first surface is located between the second surface and the lighting unit. The lenses are disposed on the first surface. The reflective layer is disposed on the second surface. The reflective layer has a plurality of light-transmissive openings respectively located on the optical axes of the lenses. The diffusion layer is disposed on the reflective layer and covers the light-transmissive openings. The reflective layer is disposed between the diffusion layer and the second surface. A liquid crystal display apparatus is also provided.

Abstract: A brightness enhancement film (BEF) includes a light transmissive substrate, a plurality of optical structures, a reflective layer, and a prism layer. The light transmissive substrate has a first surface and a second surface opposite to the first surface. The optical structures are disposed on the first surface. The reflective layer is disposed on the second surface and has a plurality of light transmissive openings. The prism layer covers the reflective layer and the second surface and includes a plurality of prism structures protruded away from the second surface. A backlight module is also provided.

Abstract: A light condensing film includes a reflective unit, a light-transmissive substrate, a plurality of lenses, and a plurality of refractive units. The reflective unit has a plurality of holes passing through the reflective unit, wherein the holes are distributed at the reflective unit. The light-transmissive substrate is disposed on the reflective unit. The lenses are disposed on the light-transmissive substrate. Moreover, the lenses respectively cover the holes of the reflective unit, and the light-transmissive substrate is disposed between the reflective unit and each of the lenses. The refractive units are disposed on the light-transmissive substrate and distributed among the lenses. The light-transmissive substrate is disposed between the reflective unit and each of the refractive units. Each of the refractive units has a light refraction plane surface. A backlight module and a liquid crystal display are also provided.

Abstract: A light-collimating film includes a transparent substrate, multiple reflective elements, and multiple micro structures. The transparent substrate has a light incident surface and a light-emitting surface opposite the light incident surface. The reflective elements are formed on the light incident surface, wherein each two adjacent reflective elements define a longitudinal aperture. The micro structures are arranged on the light-emitting surface in a direction parallel to longitudinal axes of the longitudinal apertures and overlap the longitudinal apertures to form multiple rows of micro structures.

Abstract: An optical film has a light incident side and a light emitting side above the light incident side. V shape protrusions disposed side by side are disposed at the light incident side. Collimating units disposed side by side are disposed at the light emitting side. Each of the V shape protrusions and each of the collimating units extend along a predetermined direction. The collimating units are respectively corresponded to the V shape protrusions. Two inclined surfaces of each of the V shape protrusions are respectively a light incident surface and a reflection surface. In each corresponding pair of the V shape protrusion and the collimating unit, a central axis of the collimating unit parallel to the predetermined direction is right above the reflection surface of the V shape protrusion. A backlight module using the optical film is provided to provide a plane light source having high luminance.

Abstract: A brightness enhancement film (BEF) includes a light transmissive substrate having a first surface and a second surface, a plurality of lenses disposed on the first surface, and a reflective layer. Each of the lenses has a curved protruding surface facing away from the light transmissive substrate. The radius of curvature of the curved protruding surface in a first direction parallel to the first surface is R1, the radius in a second direction is R2, and R1?R2. The reflective layer is disposed on the second surface and has a plurality of light pass openings respectively located on the optical axes of the lenses. The distance between the apex of the curved protruding surface and the corresponding light pass opening is L, the refractive index of the lenses is n, and the BEF satisfies L<nR1/(n?1) and L<nR2/(n?1). A backing light module using the BEF is provided.

Abstract: A light guide plate includes a first light guide body having a light incident plane, a first connection surface, and recesses and a second light guide body having a light emitting plane, a second connection surface opposite to the light emitting plane, and protrusions. The recesses are disposed on the first connection surface. Each of the recesses has a bottom plane parallel to the light emitting plane. The light incident plane intersects with the first connection surface. The first connection surface contacts the second connection surface. The protrusions are disposed on the second connection surface and fill the recesses respectively. Cross-sectional planes of each protrusion parallel to the light emitting plane decrease gradually in a direction towards the bottom plane of the corresponding recess. A terminal thickness of the second light guide body is less than that of the first one.

Abstract: A light guide plate (LGP) adapted to a backlight module having a light emitting surface, a bottom surface opposite to the light emitting surface, and at least one light incident surface contacting with the light emitting surface and the bottom surface is provided. The bottom surface has a plurality of flat surfaces and a plurality of groove groups. The groove groups and the flat surfaces are arranged in an alternating fashion. Each of the groove groups has at least two grooves. Each of the grooves has a first slanted surface, a peak, and a second slanted surface intersecting with the first slanted surface at the peak. In each of the grooves, a first edge side of the first slanted surface away from the peak is at a first distance from a second edge side of the second slanted surface away from the peak.

Abstract: A light guide plate has a light emitting surface, a bottom surface opposite to the light emitting surface, a light incident surface, and a side surface opposite to the light incident surface. The light incident and side surfaces are connected between the light emitting and bottom surfaces. Light guide units are disposed on the bottom surface. Each light guide unit extends along a first direction. The first direction is towards the side surface from the light incident surface. Each light guide unit includes geometric patterns and stripe patterns for cascading the geometric patterns. Micro structures are disposed in the geometric patterns and the stripe patterns. Width of the geometric pattern along a second direction perpendicular to the first direction is greater than that of the stripe pattern. The light guide plate improves uniformity of a plane light source emitting from the light emitting surface of the light guide plate.

Abstract: A screen of a projector having a substrate and a plurality of asymmetric optical structures is provided. There is a plurality of light absorbing zones and a plurality of reflective zones alternatively disposed on a surface of the substrate facing the projector. The asymmetric optical structures are disposed on the surface of the substrate and correspond to the reflective zones, respectively. The asymmetric optical structure has a first curved surface and a second curved surface, and the first curved surface protrudes toward the projector for converging an incident light from the projector on the reflective zone, and the second curved surface is disposed at a side of the first curved surface away from the projector for refracting a reflective light from the reflective zones toward the normal direction of the surface of the substrate.

Abstract: A screen adapted to a projection device having a transparent layer, a plurality of light-mixing chambers, and a plurality of lens structures is provided. The light-mixing chambers are located on a back surface of the transparent layer away from the projection device. The lens structures are disposed on a front surface of the transparent layer facing towards the projection device and corresponding to the light-mixing chambers respectively. The size of the opening of the light-mixing chamber is smaller than the size of the bottom surface of the corresponding lens structures. The lens structure is adapted to refract a light beam from the projection device, and the opening of the corresponding light-mixing chamber is adapt to allow the light beam pass through, such that the corresponding light-mixing chamber is adapted to concentrate the light beam therein and transform the light beam into a light beam projected out of the screen.

Abstract: An optical film has a light incident side and a light emitting side above the light incident side. V shape protrusions disposed side by side are disposed at the light incident side. Collimating units disposed side by side are disposed at the light emitting side. Each of the V shape protrusions and each of the collimating units extend along a predetermined direction. The collimating units are respectively corresponded to the V shape protrusions. Two inclined surfaces of each of the V shape protrusions are respectively a light incident surface and a reflection surface. In each corresponding pair of the V shape protrusion and the collimating unit, a central axis of the collimating unit parallel to the predetermined direction is right above the reflection surface of the V shape protrusion. A backlight module using the optical film is provided to provide a plane light source having high luminance.

Abstract: A backlight module disposed under a display panel and close to a polarizer on a lower surface of the display panel is provided. The backlight module has an illumination module and an optical film disposed above the illumination module. The optical film has a lower layer and an upper layer attached to the lower layer. The upper layer is close to the polarizer and has a plurality of first micro-protrusion structures formed on an upper surface thereof. The lower layer has a plurality of second micro-protrusion structures with various heights formed on an upper surface thereof. The higher second micro-protrusion structures support the upper layer, so as to form a gap with various dimensions between the upper layer and the lower layer.

Abstract: A light-emitting diode light source system includes a plurality of light-emitting diode modules for providing light beams; a light-combining unit including a plurality of light incident sides and a light emerging side, the light beams from the light-emitting diode modules entering the light-combining unit via the light incident sides, respectively, and emerging out of the light-combining unit via the light emerging side; a plurality of primary lens units disposed between the light-emitting diode modules and the light incident sides, respectively; a secondary lens unit disposed to confront the light emerging side; and a focusing lens disposed adjacent to the secondary lens unit, the secondary lens unit being disposed between the light-combining unit and the focusing lens, the light beams from the light-emitting diode modules passing through the primary lens units, the light-combining unit, the secondary lens unit and the focusing lens to be projected onto a light valve.

Abstract: A direct type illuminating device includes a light source unit, a reflector plate, a diffuser plate, and a lens module. The light source unit provides source light beams. The reflector plate and the diffuser plate are spaced at an interval from each other, and the light source unit is interposed between the reflector plate and the diffuser plate. The lens module surrounds the light source unit such that the lens module is interposed between the light source unit and the reflector and diffuser plates. An outer curved surface of the lens module has a radius of curvature different from a radius of curvature of an outer curved surface of the light source unit such that the source light beams provided by the light source unit are refracted by the lens module to result in change of traveling directions of the source light beams.

Abstract: A manufacturing method of light guide plate (LGP) for manufacturing a LGP has a plurality of colloid dot like micro-optical structures on its surface. The method includes the following processes. First, a substrate with an embossing structure is provided. Then, a plurality of colloid dots are formed on a surface of the substrate by jetting. Afterwards, a drying process is performed to convert the colloid dots into the colloid dots like micro-optical structures. Finally, a LGP is manufactured by the manufacturing method.

Abstract: An optical film is applied to a side-emitting backlight module. The side-emitting backlight module has a light guide plate for guiding a chief light beam. The light guide plate has a light emitting surface to define a normal direction thereof. The optical film includes a lower prism structure, an intermedium layer, and an upper prism structure. The lower prism structure is disposed on the light emitting surface. The intermedium layer is connected between the lower prism structure and the upper prism structure. When the chief light beam exits from the light emitting surface of the light guide plate, and then goes through the lower prism structure, it goes through the intermedium layer along a changed traveling direction. When the chief light beam exits from the intermedium layer, and goes through the upper prism structure, it turns from the changed traveling direction to the normal direction.