Abstract: In the case where, at first to fourth azimuths being angles of 0°, 45°, 90°, and 135° with respect to a second direction from a light source (13) to a light guide plate (12) of the surface emitting part in a plane perpendicular to a first direction from the surface emitting part to the light deflecting layer, luminance is measured at a predetermined distance from a measurement target point on a light exit surface of the surface emitting part in ranges of vision of ?40° to +40°, ?60° to ?74°, and +60° to +74° with respect to the first direction, all luminance values in the range of vision of ?40° to +40° at the first to fourth azimuths are not more than 40% of a maximum of luminance values in the ranges of vision of ?60° to ?74° and +60° to +74° at the first to fourth azimuths.

Abstract: An optical path unit and a liquid crystal display device excellent in luminance in the front direction are provided. A backlight unit 2, two prism films 4a and 4b, a first polarizing plate 5, a liquid crystal cell 1 having a liquid crystal layer between a pair of substrates, and a second polarizing plate 6 are disposed in the sequence. The prism films 4a and 4b are provided with a plurality of linear prisms in parallel on a light incident surface, the linear prisms having a polygonal and tapered cross section and an endmost vertex angle of 90° to 110°. The first polarizing plate 5 and the second polarizing plate 6 are disposed such that transmission axes thereof have a crossed Nicols relationship.

Abstract: The liquid crystal display device includes a liquid crystal cell, a backlight device, a first light diffusing layer, a first polarizer, and a second light diffusing layer. The first light diffusing layer includes a light diffusing plate and a prism sheet, and has light distribution characteristics such that a luminance value in a direction of 70 degrees with respect to a normal of a light incidence plane of the liquid crystal cell is 20% or less with respect to a luminance value in a direction of the normal. The second light diffusing layer includes a second polarizer and a light diffusing membrane. The backlight device is divided into a plurality of regions and is capable of controlling luminance per region.

Abstract: In a liquid crystal display device, display with a wide viewing angle and high color reproducibility is achieved and superior contrast is obtained. In addition, a viewing angle is enlarged without using a retarder. The liquid crystal display device comprises a liquid crystal cell 1, a backlight device 2, a first light diffusing layer 3, a first polarizer 4, and a second light diffusing layer 5. The first light diffusing layer 3 comprises a light diffusing plate 31 and a prism sheet 32. The first light diffusing layer 3 has light distribution characteristics such that a luminance value in a direction of 70 degrees with respect to a normal of a light incidence plane of the liquid crystal cell is 20% or less with respect to a luminance value in a direction of the normal. The second light diffusing layer 5 comprises a second polarizer 51 and a light diffusing membrane 52. In addition, the backlight device 2 is divided into a plurality of regions and is capable of controlling luminance per region.

Abstract: A liquid crystal display device provided with a back light device can relieve lamp images without lowering the utilization efficiency of the light emitted from the back light device.

Abstract: A liquid crystal display device provided with a back light device can relieve lamp images without lowering the utilization efficiency of the light emitted from the back light device.

Abstract: The present invention aims to provide a liquid crystal display capable of providing natural color display not tinged with red when viewed from an oblique front direction as well as when seen from a direct front direction. The liquid crystal display device of the present invention includes a light diffusing optical member (3), a light source (2) arranged on a rear surface side of the optical member (3), and a VA type liquid crystal panel (30) arranged on a front surface side of the optical member (3). The light diffusing optical member (3) is made of a transparent material in which light diffusing particles are dispersed. A relational expression of 0.01??n×D50?0.25 is satisfied, where ?n is an absolute value of a difference between a refraction index of the transparent material and a refraction index of the light diffusing particles, and D50 (?m) is an accumulative 50% particle diameter of the light diffusing particles.

Abstract: The luminance in the front direction is enhanced in an illumination device provided with a light source, a light diffusion means, and a light-collecting means disposed in this order. The light source 1 is provided with a rectangular parallelepiped case 12 having an opening 121 and a plurality of CCFLs 11 disposed in the case 12. A light diffusion plate 2 is mounted so as to close the opening 121 of the case 12. The light-collecting means 3 has two prism films 31 and 32 which are disposed on the light-exiting surface of the light diffusion plate 2 such that ridge lines of linear prisms are orthogonal to each other.

Abstract: An optical path unit and a liquid crystal display device excellent in luminance in the front direction are provided. A backlight unit 2, two prism films 4a and 4b, a first polarizing plate 5, a liquid crystal cell 1 having a liquid crystal layer between a pair of substrates, and a second polarizing plate 6 are disposed in the sequence. The prism films 4a and 4b are provided with a plurality of linear prisms in parallel on a light incident surface, the linear prisms having a polygonal and tapered cross section and an endmost vertex angle of 90° to 110°. The first polarizing plate 5 and the second polarizing plate 6 are disposed such that transmission axes thereof have a crossed Nicols relationship.

Abstract: The present invention provides a brightness enhancement film-laminated light diffuser plate which can sufficiently prevent scratching, and also can ensure sufficient brightness. The brightness enhancement film-laminated light diffuser plate of the present invention includes a brightness enhancement film 41, and a light diffuser plate 31 comprising a transparent material and a light diffusing agent dispersed in the transparent material, and having a rough surface having a ten-point average roughness (Rz) of more than 40˜m and 100˜m or less on at least one surface, wherein the brightness enhancement film 41 is laminated and integrated on the rough surface 31a of the light diffuser plate via an adhesive layer 40.

Abstract: The present invention provides a light diffuser plate, the surface of which is less likely to be scratched, capable of laminating a film base material (3) with a high lamination strength. The light diffuser plate (1) of the present invention includes a transparent material and a light diffusing agent dispersed in the transparent material, wherein one or both surfaces are rough surfaces (1a) having a ten-point average roughness (Rz) of 20 to 40 ?m. A film-laminated light diffuser plate (4) can be obtained by laminating an adhesive film (5) comprising the film base material (3) and an adhesive layer (2) formed on at least one surface of the film base material on the rough surface.

Abstract: The present invention relates to a light-diffuser-plate-with-primer-layer, which permits lamination of an optical film or the like thereon with a sufficient bonding strength, and a process for producing the same efficiently and at a lower cost.

Abstract: The present invention provides a liquid crystal display device capable of achieving natural and high-quality color display without reddish color shift, not only when viewed in the normal direction but also when viewed obliquely. A liquid crystal display device 1 of the present invention includes a light diffuser plate 3, a light source 2 disposed on the back side of the light diffuser plate 3, and a liquid crystal panel 30 disposed on the front side of the light diffuser plate 3, wherein the light diffuser plate 3 is constituted by dispersing light diffusing particles in a transparent material, and the absolute value of a difference ?n in the refractive index between the transparent material and the light diffusing particles and a 50% cumulative particle diameter D50 (?m) of the light diffusing particles satisfy a relation 0.01??n×D50?0.25 or 0.61??n×D50?0.75.

Abstract: The present invention provides a brightness enhancement film-laminated light diffuser plate which can sufficiently prevent scratching, and also can ensure sufficient brightness. The brightness enhancement film-laminated light diffuser plate of the present invention includes a brightness enhancement film 41, and a light diffuser plate 31 comprising a transparent material and a light diffusing agent dispersed in the transparent material, and having a rough surface having a ten-point average roughness (Rz) of more than 40 ?m and 100 ?m or less on at least one surface, wherein the brightness enhancement film 41 is laminated and integrated on the rough surface 31a of the light diffuser plate via an adhesive layer 40.

Abstract: The present invention provides a surface light source device capable of emitting light with high uniformity in luminance.

Abstract: The present invention provides a light collecting sheet-laminated light diffuser plate which can diffusely transmit transmission light (L) with sufficient luminance without causing rubbing of a light diffuser plate (2) and a light collecting sheet (4) against each other. The light collecting sheet-laminated light diffuser plate (1) of the present invention comprises a light diffuser plate (2), a light collecting sheet (4) and an adhesive layer (3), the light collecting sheet being laminated on one side (2a) of the light diffuser plate via the adhesive layer, wherein the one side (2a) is provided with unevenness, and the light collecting sheet (4) is laminated on the one side (2a) so that the adhesive layer (3) is not contacted with the bottom (2a1) of the unevenness.

Abstract: There is provided a light diffuser plate with a light-collecting layer, which is sufficiently prevented from flawing and which is used to make it possible to sufficiently ensure a luminance in a forward direction. A light diffuser plate 3 with a light-collecting layer, according to the present invention, comprises a light-diffusing substrate 31 and a light-collecting sheet 32, which are disposed to be superposed on each other, and is wherein the light-diffusing substrate 31 and the light-collecting sheet 32 are jointed to each other by joint portions 34 which are so disposed as to be scattered over a whole plane of the light diffuser plate, and wherein an air layer 33 exists between the light-diffusing substrate 31 and the light-collecting sheet 32, in an area other than the joint portions 34.

Abstract: The present invention provides a light diffuser plate with a light-collecting layer, which can be sufficiently prevented from flawing and which can ensure a sufficient luminance in a front direction. A light diffuser plate 3 with a light-collecting layer, of the present invention, comprises a light-diffusing substrate 31 and a light-collecting sheet 32 which are disposed in a stacked state and are united at their peripheral portions so that an air layer 33 is formed between the light-diffusing substrate 31 and the light-collecting sheet 32.

Abstract: A white surface light source comprising a light diffuser plate and a light source provided on the back side of the light diffuser plate, wherein the light source comprises at lease one LED element which emits lights including a red color, and the light diffuser plate comprises a transparent material and light diffusing particles dispersed in the transparent material, and wherein an absolute value An of a refractive index difference between the transparent material and the light diffusing particles, and a 50% cumulative particle diameter D50 (?m) of the light diffusing particles satisfy the relationship: 0.25<?n×D50<0.61 or 0.75<?n'D50.

Abstract: The present invention provides a light diffuser plate, the surface of which is less likely to be scratched, capable of laminating a film base material (3) with a high lamination strength. The light diffuser plate (1) of the present invention includes a transparent material and a light diffusing agent dispersed in the transparent material, wherein one or both surfaces are rough surfaces (1a) having a ten-point average roughness (Rz) of 20 to 40 ?m. A film-laminated light diffuser plate (4) can be obtained by laminating an adhesive film (5) comprising the film base material (3) and an adhesive layer (2) formed on at least one surface of the film base material on the rough surface.