125results about How to "Increase front brightness" patented technology

A light guide plate has a hologram pattern on a light exit surface. The hologram pattern anisotropically diffuses light in the direction parallel with a light incident surface of the light guide plate. On a back surface of the light guide plate are formed mirror-polished prism structures extending parallel with the light incident surface. A downward-pointing prism sheet with a given prism apex angle is placed on the light exit surface of the light guide plate. The use of the downward-pointing prism sheet together with the light guide plate having the anisotropic diffusion hologram pattern integrally formed thereon produces a liquid crystal display device with enhanced luminance properties.

The invention relates to a direct backlight module which comprises a frame, a plurality of light-emitting diodes, a diffusion plate, a first optical plate and a second optical plate, wherein the light-emitting diodes are arranged on a bottom plate of the frame, the diffusion plate is arranged above the light-emitting diodes, the second optical plate is arranged between the light-emitting diodes and the diffusion plate, and the first optical plate is arranged above the diffusion plate at intervals; a plurality of optical microstructures are formed at a light exit surface of the first optical plate; a light exit surface of the second optical plate is a plane, and a light entry surface of the second optical plate is close to the light-emitting diodes; and the second optical plate also comprises a plurality of V-shaped ridge structures which are formed at the light entry surface, extend along at least two different directions, and are mutually staggered. The direct backlight module has better exit ray uniformity and is suitable for thinned design.

An optical sheet includes a base film in which light is incident from a lower side, a plurality of prism patterns and a diffusion member. The prism patterns are protruded to be spaced apart from each other on the base film to enhance the front luminance of light incident from the lower side of the base film. The diffusion member is disposed between prism patterns to have a diffusion surface in parallel with the base film. The diffusion member includes a plurality of diffusion dots capable of enhancing the luminance uniformity of light incident from the lower side of the base film. Thus, front luminance and luminance uniformity may be enhanced due to a juxtaposition of the prism patterns and the diffusion portion, and the viewing angle of the LCD device may be enhanced.

The present invention is objected to improve brightness in a front direction in a surface light source element including a light-guiding plate having a primary light source at least one side surface, a reflector and a prism sheet. In the surface light source element using the light-guiding plate (1) including a concave stripe (9) on a bottom surface (7) side, in order to emit light in the front direction after passing through the prism sheet of an optical sheet above the light-guiding plate (1), an average angularity R of an inclined surface of the concave stripe (9) to the bottom surface of the light-guiding plate is within the range described by the following condition,

R≦[π/2−sin⁻¹(0.422/n_LGP)]/2

R≧sin⁻¹(1/n_LGP)−sin⁻¹(0.643/n_LGP)

• • R: the average angularity (radian) to the bottom surface of the light-guiding plate (1),
  • n_LGP: a refractive index of a base material of the light guiding plate (1).

An anti-glare film comprises an anti-glare layer, and a low-refraction-index layer formed on at least one surface thereof and comprising a low-refraction-index resin and a hollow silica particle. The film has an internal haze of 0 to 1%, a haze of 5 to 6.5%, a transmitted image clarity of 20 to 30%, and a reflected light of the film has a* of 0.5 to 1.3 and b* of −2.3 to −0.5. The particle may have a mean particle diameter of about 50 to 70 nm and a refraction index of about 1.2 to 1.25. The film may have an uneven surface, and the average inclination angle of the surface may be about 0.7 to 1°. The anti-glare layer may comprise plural polymers and have a domain formed by a phase separation, and a difference in refraction index between the polymers may be about 0 to 0.04.

A light guide plate, comprising a light exiting surface and a light entering end, has a shape in which its thickness perpendicular to the light exiting surface increases gradually as it is away from the light entering end and has scattering particles scattered therein. A light guide plate assembly comprises this guide plate, and a prism sheet in which a plurality of prisms are arranged in parallel with the apex angles of the prisms arranged facing the light exiting surface. A surface illuminating device comprises a light guide plate or a light guide plate assembly, and a liquid crystal display device comprises the surface illuminating device. The scattering particles scatter light entering at the light entering end and propagating through the inside and satisfy the following expression (1) and (2), and the apex angles of the prisms of the prism sheet satisfy the following expressions (3) and (4). (F is scattered sectional area, NP is particle density, LG is length of guide plate along incident direction, KC is correction coefficient, phi is apex angle of symmetric prism, and theta1 and theta2 are two apex angles divided by perpendicular of non-symmetric prism.) 1.1<=FNPLGKC<=8.2 ---(1) 0.005<=KC<=0.1 ---(2) 55 DEG<=theta<=80 DEG ---(3) 0 DEG<= theta1<= 15 DEG and 30 DEG<= theta2<= 45 DEG ---(4).

Provided is a polarization laminate that allows a distinct transmission image to be displayed on a translucent screen while maintaining the visibility of a projection image from a projector even in a case where the translucent screen contains a diffusion-polarization plate. A transparent polarization laminate as a member of a translucent projector screen for displaying a projection image from a projector comprises a diffusion polarization layer and an absorption polarization layer, the diffusion polarization layer comprises a continuous phase comprising a first transparent thermoplastic resin and a dispersed phase comprising a second transparent thermoplastic resin and having a refractive index different from that of the continuous phase, and these layers are laminated so that the diffusion polarization layer may have a transmission axis substantially parallel with a transmission axis of the absorption polarization layer. The diffusion polarization layer may comprise a stretched sheet, the continuous phase may have an in-plane birefringence of less than 0.05, the dispersed phase may have an in-plane birefringence of not more than 0.05, and a difference in refractive index for linearly polarized light between the continuous phase and the dispersed phase in a stretching direction may be different from that in a direction perpendicular to the stretching direction.

A liquid crystal display includes: a display panel; and a color conversion layer positioned on the display panel, wherein the color conversion layer includes a scattering layer including a color conversion media layer and scatterers.

A display unit which the view angle is limited and the front luminance is improved is provided. The display unit includes a display device, and a light guiding part which is provided to face the display device, has an incident face on the side opposing to the display device, an emitting face on the opposite side of the display device, and a reflective face on the side face, and has a cross section expanding from the incident face to the emitting face.

Provided is a light-scattering film that is positioned at the front surface side of a liquid-crystal cell, which displays desirable front-facing brightness, and which is capable of obtaining a liquid-crystal display device wherein dots are not visible. An embodiment of the present invention is a light-scattering film positioned at the front surface side of a front surface polarizing plate 706 in a liquid-crystal display device comprising: an edge-light planar light source 702, further comprising a light guiding plate 721 and a light source 722 that is positioned laterally to the light guiding plate 721; a liquid crystal cell 701 that is positioned at the front surface side of the edge light planar light source 702; and the front surface polarizing plate 706, which is positioned at the front surface side of the liquid crystal cell 701. The light-scattering film comprises: a substrate film 101; and a light scattering layer 102 that is stacked on the substrate film 101, further comprising: a translucent resin 103, and translucent minute particles 104 that are dispersed in the translucent resin 103. The sum of the transmitted clarity that is measured via four types of optical probes, the widths of the dark parts and the light parts thereof being 0.125mm, 0.5mm, 1.0mm, and 2.0mm, is 50% - 300%.

An optical sheet for a backlight is provided on a surface light source in the backlight. An optical reflection layer has a plurality of through grooves formed on a transparent substrate and arranged at a prescribed interval. The width of the through hole is narrowed from the upper surface opening to the lower surface opening. Each of the cylindrical lenses is filled within a corresponding through groove, and its surface is a cylindrical surface that covers the upper surface opening of the through groove. Light from the light source comes in only from the lower surface opening, so that the angle of incidence of light when the light reaches the cylindrical surface can be controlled, and an increased amount of light deflected toward the front surface can be emitted. Therefore, the optical sheet for a backlight can collect light from the surface light source in the front surface direction.

A liquid-crystal display device having a backlight unit emitting unpolarized blue light, a light conversion member, a polarization separating member, a backlight-side polarizer, a liquid crystal cell, and a display-side polarizing plate wherein the polarization separating member separates the unpolarized blue light into blue transmitted light and blue reflected light which are linearly polarized in vibration directions that are orthogonal to each other, and transmits some of light in a wavelength range each of 500 nm to 600 nm and 600 nm to 650 nm, the light conversion member includes a fluorescent material that, due to blue light entering the light conversion member, emits green light which is linearly-polarized light and red light which is linearly-polarized light; and a transmission axis of the backlight-side polarizer is parallel to vibration directions of the green and red light, is improved in terms of front surface luminance and color reproduction region.

A light source device including a light guide plate and a light source, in which the light guide plate includes an incident surface on which light emitted from the light source is incident, an emission surface emitting light incident from the incident surface, and a propagating reflection surface which is a surface opposite to the emission surface and which propagates and reflects the light incident from the incident surface toward the emission surface, the propagating reflection surface has approximately V-shaped grooves and the V-shaped grooves have two kinds of grooves.

A light guide plate 13 has a number of back surface-side unit optical structures 131 arranged in a back surface 13d along a light guide direction. Each back surface-side unit optical structure 131 is tapered in a direction away from a light exit surface 13c, and has a first inclined surface 132 lying on the light entrance surface side, a second inclined surface (133) lying opposite the first inclined surface and which totally reflects at least part of incident light, and a top surface region 134 lying between the first inclined surface 132 and the second inclined surface 133, and located farthest from the light exit surface 13c. The top surface regions 134 each include a plurality of surfaces 134a to 134d which are parallel to the light exit surface 13c and have different heights “h” in the direction away from the light exit surface 13c.

The present invention provides a light-emitting device which includes, in the order mentioned, a light-emitting layer containing a light-emitting portion, an interference layer, and a fine concavo-convex pattern, wherein the interference layer is disposed over a second surface of the light-emitting layer which surface is opposite to a first surface of the light-emitting layer, and reflects, toward the first surface, light emitted from the light-emitting layer, and wherein the fine concavo-convex pattern has a cross-sectional shape which has portions projected and recessed with respect to the light-emitting layer, and reflects light emitted from the light-emitting layer.

The invention discloses a prism sheet. The prism sheet comprises a light transmission material layer; the light transmission material layer comprises a first surface; and the shape of the first surface is formed by rotation of a wavy line around the center of prism sheet in a fixed or variable radius. By adopting the technology disclosed by the invention, the front brightness of a display screen can be improved, and the diffraction phenomenon is avoided at the same time.

Provided are a brightness enhancement film including a λ/4 plate, and a reflection polarizer, in which the reflection polarizer includes at least two light reflection layers formed by immobilizing a cholesteric liquid crystalline phase, one light reflection layer of the reflection layers is a layer formed of a polymerizable liquid crystal composition containing a rod-like liquid crystal compound, and the other light reflection layer is a layer formed of a polymerizable liquid crystal composition containing a disk-like liquid crystal compound, and an optical sheet member including the brightness enhancement film, and a liquid crystal display device including the optical sheet member. The brightness enhancement film of the present invention has high brightness and is able to suppress an oblique change in the shade at the time of being incorporated in a liquid crystal display device.

A front luminance of light emitted from a surface light emitting apparatus having a surface light emitting element is greatly improved. The surface light emitting apparatus is provided with a surface light emitting element (20) and a photochromic sheet (10). A repeated uneven pattern having a cross section in a trapezoidal shape is arranged at least on one side of the photochromic sheet, a flat portion (12a) at the tip on the protruding side of the unevenness is adhered to an emitting surface (21a) of the surface light emitting element, and conditions of 0.75>D>4[(sin θ−1/n)²+0.034] are met, where, θ is an apex angle formed by facing inclined surfaces protruded in a trapezoidal shape of the photochromic sheet, n is a refractive index of the photochromic sheet, and D is a ratio of the length of the surface light emitting element at a portion adhered to the emitting surface to the length of at least one cycle of the unevenness in an arrangement direction.