129results 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 / nLGP)] / 2R≧sin−1(1 / nLGP)−sin−1(0.643 / nLGP)R: the average angularity (radian) to the bottom surface of the light-guiding plate (1),nLGP: 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).

A light emitting device includes a board, a semiconductor light emitting element formed on the board optionally via a submount, a cap sealing the semiconductor light emitting element and a reflector provided surrounding the cap. The cap has top and bottom surfaces that are parallel to the top surface of the semiconductor light emitting element, and the spacing between the top and bottom surfaces is 1-3 times the longest diagonal or the diameter of the semiconductor light emitting element. Also disclosed is a process for producing the device.

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.

The front luminance of the light emitted from a surface light emitter provided with a surface light emitting device is greatly enhanced. In a surface light emitter in which a light control sheet 10 having a concavoconvex structure provided on one of its surfaces is affixed on to the light emitting side surface of a surface light emitting device, the projections 12 on one surface of the above light control sheet gets small towards the light emitting side surface of the above surface light emitting device, not only the tip surfaces 12a of these projections 12 are affixed to the light emitting side surface, but also a transparent material with a lower refractive index than the above light control sheet is packed in the space part 13 formed between the projections of the above light control sheet and the light emitting side surface of the surface light emitting device.

There is provided a resin sheet having a thickness of 1 to 5 mm,having recesses formed on one surface thereof, the recess having a multi-sided pyramid shape, a truncated multi-sided pyramid shape, a conical shape, a truncated conical shape or a severed sphere shape,having an angle α which satisfies 10°≦α≦40° or 50°≦α≦80° or 40°<α≦43° or 47°≦α<50° when the angle α is formed by a side face or the generatrix of the recess and a plane having the opening of the recess thereon, andsatisfying at least one of the following conditions (1) and (2).(1) The above recesses form a number of row groups, wherein each row group which constitute the number of row groups comprises a number of rows adjacent to each other, each row comprises the recesses arranged in a line, and each row group is adjacent to other row groups via areas free of the recesses.(2) Severed-sphere-shaped projections are formed on the surface opposite to the surface having the above recesses formed thereon.

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%.

A light diffusing film contains a thermoplastic resin as the main component and contains, in the thermoplastic resin, at least one kind of a light-transmitting particle having an average primary particle diameter of 3 to 10 μm, wherein the absolute value of the refractive index difference between the thermoplastic resin and the light-transmitting particle is from 0.01 to 0.06, wherein one surface has concavoconvex shape, the total haze value is from 15 to 30%, the internal haze value is from 5 to 25%, the surface haze value is from 5 to 20%, and the average film thickness is from 20 to 200 μm.

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.

The invention provides a light guide plate, a planar illuminator using the same and a liquid crystal display apparatus. The light guide plate made of a transparent resin is used for converting light of light sources into planar light. The light guide plate comprises a light exit plane having a rectangular outer shape; four light entrance planes which are connected to four sides of the light exit plane and are substantially orthogonal to the light exit plane; and a backside which is planes opposed to the light exit plane and includes four inclined planes inclined to be farther from the light exit plane toward a center from the four light entrance planes, wherein a minimum thickness is in the four light entrance planes and a maximum thickness is in the center from the four light entrance planes.

A microlens array 1' constituted of a plurality of microlenses 1 each having a flat section 1a at a top portion is arranged on one side of a liquid crystal display panel 11 from which side light from a backlight enters. Each microlens 1 is so formed that its width is equal to the pixel pitch. Consequently, the viewing angle can be widened without deteriorating front luminance.

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.

Provided is an optical film having diffusion pattern capable of diffusing light while decreasing the light that is emitted in a directions other than the vertical direction to be lost, and moreover, to provide an optical film having both functions of a prism sheet and a diffusing sheet.A plurality of diffusion patterns are formed on a light incident plane of an optical film , to form a plurality of prisms on a light exit plane. At least in one section, the diffusion pattern consists of a main inclined face formed of a curved face of a relatively small inclination, and a sub-inclined face of a relatively large opposite inclination to the main inclined face .

The invention relates to the technical field of optical thin film, in particular to a diffusion membrane capable of enlarging the viewing angle. The diffusion membrane is used for further enlarging the viewing angle of a backlight module. The diffusion membrane comprises a transparent base material, a diffusion coating and a protection coating, wherein the diffusion coating and the protection coating are arranged on the two sides of the transparent base material respectively, the diffusion coating comprises, by weight, 100 parts of adhesives and 75-120 parts of diffusion particles, the diffusion particles are adhered to the upper surface of the transparent base material through the adhesives, the particle diameters of the diffusion particles are the same, or the particle diameter variable coefficient of the diffusion particles is smaller than or equal to 15%, and the particle diameters of the diffusion particles are 8-35 microns. The diffusion membrane has the function of improving luminance and the function of enabling light to be even, and can effectively enlarge the viewing angle of the backlight module, and thus the viewing angle of a liquid crystal displayer is enlarge, and the watching effect of the liquid crystal displayer can be better.

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.

One of the objects is to improve the light utilization efficiency of a liquid crystal display panel with microlenses.A liquid crystal display device of the present invention, including a plurality of pixels arranged in a matrix along a first direction and a second direction which are perpendicular to each other, includes a TFT substrate, a counter substrate, a liquid crystal layer, a plurality of microlenses, and a backlight provided on a side of the plurality of microlenses which is opposite to the TFT substrate. The plurality of microlenses includes a plurality of lenticular lenses extending in the first direction, the plurality of lenticular lenses being arranged side by side along the second direction. The backlight includes a prism sheet placed over a first surface of the light guide plate which is closer to the microlens. The first surface of the light guide plate is provided with a prism array that includes a plurality of prisms extending in the second direction, the plurality of prisms being arranged side by side along the first direction.

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 is an organic EL display apparatus in which, depending on a situation in which a user uses the organic EL display apparatus, display with high light use efficiency and high front luminance (luminous efficiency)or display with large view angle is selectable. Pixels each include subpixels having different optical characteristics from each other, and the pixels and the subpixels are respectively arranged in a staggered pattern. Further, the subpixels are independently controlled.

A light source device and display device capable of suppressing occurrence of unevenness in luminance therefrom by using a light guide with concave or convex structural portions in combination with a reflection layer disposed adjacent the light guide and including a plurality of spacers for strategically positioning the layer's reflecting surface from the light guide. Light within the light guide is both reflected from the guide (e.g., to an adjacent display panel) or emitted onto the reflecting surface and passed back through the guide for eventual emission (e.g., to the same display panel). A reflection sheet including a base sheet, reflection layer and structural portions is also provided.

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.