34results about How to "Suppress uneven brightness" patented technology

A light guide plate includes: a depressed portion provided on an opposite side of a light exit surface from which light is emitted; a first direction changing portion which is provided inside the depressed portion and above a light emitting element in a direction oriented toward the light exit surface, the light emitting element being provided on the opposite side of the light exit surface, and which changes a direction of travel of at least a part of light of the light emitting element; and a second direction changing portion which is provided above the light emitting element and higher than the light exit surface and which changes a direction of travel of at least a part of light of the light emitting element.

A light-emitting module (2) includes a mounting board (1) with a conductor pattern and a plurality of light-emitting elements (15) mounted on the conductor pattern via wires (21). The extending direction of each of the wires (21) toward the conductor pattern is oriented irregularly when viewed perpendicularly to the mounting board (1). This can prevent the shadows of the wires (21) from overlapping, and thus can suppress the luminance nonuniformity.

A backlight unit having light sources being arranged to be spaced apart from adjacent other light sources in two or more arrangement directions in a plane where the light sources are arranged.

An illumination device includes a light guide plate having an incident end face and a reflecting surface, and a plurality of light sources provided at the incident end face of the light guide plate. The reflecting surface of the light guide plate has a diffusing pattern for diffusing incident light, the diffusing pattern has a plurality of ridgelines arranged perpendicularly to a propagating direction of the incident light to diffuse the incident light, and the ridgelines are discontinuous in the propagating direction.

A multi-screen display apparatus is a multi-screen display apparatus in which screens of a master apparatus and slave apparatuses are arranged. Each of the master apparatus and the slave apparatuses includes a light source for three primary colors formed of a semiconductor light emitting element, and a memory circuit for storing a brightness corresponding to a control current that is specific to each of the primary colors of the light source. The master apparatus determines a common target brightness based on the brightness outputtable by the master apparatus itself and the brightnesses outputtable by other apparatuses. Each of the master apparatus and the slave apparatuses reads, as a target control current, the control current corresponding to the target brightness from the memory circuit, and supplies the target control current to the light source.

A multi-screen display apparatus is a multi-screen display apparatus in which screens of a master apparatus and slave apparatuses are arranged. Each of the master apparatus and the slave apparatuses includes a light source for three primary colors formed of a semiconductor light emitting element, and a memory circuit for storing a brightness corresponding to a control current that is specific to each of the primary colors of the light source. The master apparatus determines a common target brightness based on the brightness outputtable by the master apparatus itself and the brightnesses outputtable by other apparatuses. Each of the master apparatus and the slave apparatuses reads, as a target control current, the control current corresponding to the target brightness from the memory circuit, and supplies the target control current to the light source.

The optical waveguide sheet of the present invention is an optical waveguide sheet for use in an edge-lit backlight unit of a liquid crystal display unit of laptop computers having a housing thickness of no greater than 21 mm, and includes an optical waveguide layer containing a polycarbonate-based resin as a principal component; and a protective layer laminated on the back face of the optical waveguide layer, the protective layer containing an acrylic resin as a principal component, wherein an average thickness of the optical waveguide sheet is no lower than 250 μm and no greater than 600 μm. An average thickness of the protective layer is preferably no less than 10 μm and no greater than 100 μm, and a relative refractive index of the protective layer with respect to the optical waveguide layer is preferably no greater than 0.95.

A plurality of LEDs (11) in an LED group (GP) are arranged in parallel in a longitudinal direction of an incident face (21s) on an optical waveguide (21) to form LED rows (12a and 12b). Those two LEDrows (12a and 12b) are placed in parallel in the direction intersecting with the incident face (21s).

To provide a technique for suppressing brightness non-uniformity of an area illuminated by a light source and also suppressing a decline in contrast between areas caused by incidence of a luminous flux of the area to another area. Provided is a light guide plate including: a diverging portion which is provided on an opposite side of a light exit surface from which light is emitted, the diverging portion causing a luminous flux emitted from a light emitting element to diverge; and a restricting portion which is provided, when a prescribed range from the light emitting element on the light exit surface is defined as an illuminated area illuminated by the light emitting element, in at least a periphery of the illuminated area on the light exit surface and which deflects or shields light traveling from inside toward outside of the illuminated area to restrict traveling, toward a side of the light exit surface, of light traveling toward the outside of the illuminated area.

Disclosed herein is a display including an acceptor substrate having thereon a red light-emitting element column, a green light-emitting element column, and a blue light-emitting element column that are arranged along a row direction and are each obtained by arranging rectangular organic light-emitting elements for generating light of one of red, green, and blue along a longitudinal direction of the organic light-emitting elements. The invention is used to testrain the problems of luminance nonuniformity, uneven color, decreased luminous efficiency and the like, and improve the display quality.

Provided is a directly under backlight device for a display unit of high brightness by minimizing uneven brightness of tubes efficiently without using an optical member subjected to special processing.  The directly under backlight device comprises a reflective material, a plurality of linear light sources, and a group of optical members that are arranged in this order, and satisfies the following conditions (i)-(v).  (i) The plurality of linear light sources are arranged with the longitudinal directions thereof in parallel. (ii) The optical member, closest to the linear light sources, in the group of optical members has a haze value of 99.0% or less based on the JIS K 7136 (2000) and measured by making light enter from the surface on the linear light source side. (iii) There is a prism sheet in the group of optical members, a plurality of protrusions extending in one direction are formed on the surface of the prism sheet which is on the reverse side of the linear light source, the plurality of protrusions are parallel in the longitudinal direction, and the longitudinal direction of the plurality of protrusions is parallel with the longitudinal direction of the plurality of linear light sources. (iv) The reflective material has a 60° glossiness of 5 or less measured based on the JIS K 7105 (1981) for the surface on the linear light source side. (v) Assuming the distance between the centers of adjoining linear light sources in the plurality of linear light sources is L, and the distance from the center of the linear light source to an optical member closest to the linear light source is H, ? satisfying the following expression (1) falls in a range of 45°=?=70°. ?=tan-1((L / 2) / H) ... expression (1).

The invention discloses a display device and a television set. This display device includes a display device body, a display portion arranged on the front side of the display device body, configured to display an image, a light source supplying light to the display portion, a first light guide plate arranged to be opposed to the light source, having a light incident surface including a side surface on which light emitted from the light source is incident and a light emitting surface provided on a side surface opposite to the light incident surface to emit the light incident from the light incident surface, a second light guide plate arranged to overlap with the first light guide plate, guiding the light emitted from the light emitting surface of the first light guide plate to the display portion, and a first reflective member arranged between the first light guide plate and the second light guide plate. Unevenness in brightness on a display portion is suppressed while suppressing complication of the shape of a light guide plate and an increase in the width of a frame even when the number of light sources is reduced.

The purpose of the present invention is to provide: an adhesive composition for optical applications, which is capable of suppressing luminance unevenness without deteriorating the contrast characteristics in optical applications, and which can be used for optical members and prevents the optical members from separation in a reliability test; an adhesive layer; an optical member; an image display device and the like. An adhesive composition for optical applications, which contains 100 parts by weight of a modified (meth)acrylic graft polymer and 0.01-1.80 parts by weight of an isocyanate crosslinking agent, is prepared. The modified (meth)acrylic graft polymer is obtained by graft polymerizing chains, each of which contains a cyclic ether group-containing monomer, to the trunk polymer, and contains, as constituent components, an alkyl (meth)acrylate, a cyclic ether group-containing monomer, and a non-cyclic ether group-containing monomer. The modified (meth)acrylic graft polymer contains 8-40 parts by weight of the non-cyclic ether group-containing monomer per 100 parts by weight of the total of other monomer components that constitute the trunk polymer. An adhesive layer for optical applications, which is formed from the composition, an optical member, an image display device and the like are also produced.

The optical waveguide sheet of the present invention is an optical waveguide sheet for use in an edge-lit backlight unit of a liquid crystal display unit of laptop computers having a housing thickness of no greater than 21 mm, and includes an optical waveguide layer containing a polycarbonate-based resin as a principal component; and a protective layer laminated on the back face of the optical waveguide layer, the protective layer containing an acrylic resin as a principal component, wherein an average thickness of the optical waveguide sheet is no lower than 250 μm and no greater than 600 μm. An average thickness of the protective layer is preferably no less than 10 μm and no greater than 100 μm, and a relative refractive index of the protective layer with respect to the optical waveguide layer is preferably no greater than 0.95.

The invention provides a luminous pointer which can offer an increased commercial value with its glowing surface having the ability to glow generally uniformly. The luminous pointer is constructed of a pointer element 1 which is made of a light-transmitting material and forms an indicating portion (glowing surface) 2, a light-blocking cover 10 which covers a central region of swing motion R of the pointer element 1 and opens rearward, and a shielding element 12 which covers the rear side of the central region of swing motion R of the pointer element 1. The pointer element 1 has in its central region of swing motion R reflecting parts 4 to 7 for reflecting illuminating light fed from the rear side at least toward its tip end, and the shielding element 12 has exposing parts 123 for exposing the reflecting parts 4 to 7 of the pointer element 1 and is formed of a light-transmitting material which makes it possible to adjust the amount of transmission of the illuminating light.

The invention provides a switch (4) composed of an irradiation mechanism (60) having an operation body and irradiating light from inner side of the operation body to a translucent section, The operation has an operation face (11) formed with a translucent section and a push section (23) shifts for pushing a switch (50) by push force onto the operation face (11), the operation body is composed of an operation member (10) of the operation face (11) and a push member (20) of the push section (23), the push member (20) is formed with the translucent material. Therefore, the switch (4) may prevent retraction from generating on the operation face (11), restrain asymmetry of lightness and improve push operation feeling.

A diffusion plate includes a base body including a plurality of convex portions formed on a principal surface of the base body. An angle of inclination of the convex portions at a base of the convex portions ranges from 38° to 42°. Also, a ratio R / Cp between a curvature R of a summit of the convex portions and a pitch Cp between adjacent convex portions is 0.0014<R / Cp<0.43.

There is provided a back light source device comprising a housing 11 which is provided with an even number of discharge tubes (L1-L5), (L1'-L5'), each having a pair of electrodes. Said even number of discharge tubes is divided into a plurality of and even number of discharge tube groups, each having same number of discharge tubes. Two discharge tube groups are selected from said even number of discharge tube groups (L1-L5) and are regarded as a group every time. In each group, one end of a discharge tube selected from one discharge tube group selected from said two discharge tube groups is electronically connected to the other end of a discharge tube which is in the same row with said discharge tube and selected from the other discharge tube group (L1'-L5') selected from said two discharge tube groups.