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

Light color beams respectively from LEDs formed on an LED array substrate are allowed to enter one edge of second light guide plates for color mixing, which is arranged to either side of the LEDs. In each of the second light guide plates, color mixing of the respective color light beams occurs with increasing distance from this one edge, and thereby white light is obtained. This white light is guided out through the other edge of the second guide light plate, is reflected by a second reflection plate, and then is allowed to enter either of two opposite edges of a first light guide plate. The white light having entered the first light guide plate is radiated out from a front surface thereof.

An object of the present invention is to provide a lighting device configured to suppress uneven brightness. A backlight unit 12 according to the present invention includes LEDs 17 as light sources, a chassis 14 housing the LEDs 17 and including an opening 14b through which light from the LEDs 17 exits, an optical member 15 arranged to cover the opening 14b and face the LEDs 17, and a reflection sheet 19 arranged in the chassis 14 to face the optical member 15. A surface in the chassis 14 facing the optical member 15 includes a light source arrangement area LA in which the LEDs 17 are arranged and a light source non-arrangement area LN in which no LED 17 is arranged. The light source arrangement area LA corresponds to a low light reflectance area LRA having relatively low light reflectance, and the light source non-arrangement area LN corresponds to a high light reflectance area HRA having relatively high light reflectance.

A light source device includes a light source section adapted to emit excitation light, a lens array adapted to divide the excitation light into a plurality of partial light beams, a light collection optical system adapted to collect the excitation light divided into the plurality of partial light beams, and a light emitting element adapted to emit fluorescence by being excited by the excitation light.

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 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.

There are provided a light source device and a display device which do not generate a wrinkle on an optical sheet even if the optical sheet is held on an LED substrate. A reflection sheet 11 is disposed between each of head portions possessed by a rivet, a positioning rivet and a support rivet and one surface of an LED substrate 8 where an LED is mounted, and a gap in a direction of a sheet thickness is provided between the head portion of each of the rivets and the reflection sheet 11. In the case in which a sudden thermal change is caused, therefore, the reflection sheet 11 expands or contracts between the head portion of each of the rivets and the reflection sheet 11 so that the wrinkle can be prevented from being generated over the reflection sheet 11.

A substantially constant current is supplied from a shunt circuit to each line in order to control light emission of light emitting diodes. A predetermined number of light emitting diodes are arranged in series as a set. Sets of the light emitting diodes to be connected to a first line and the light emitting diodes to be connected to a second line are arranged in a line on the same straight line on a substrate. The substrates are connected adjacently in the row direction, so that the sets of the light emitting diodes to be connected to the first line and the light emitting diodes to be connected to the second line are alternately arranged. Thus, it is possible to provide a backlight device having a plurality of LED arrays capable of uniformly emitting light over the entire screen.

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 method for producing an organic electroluminescent device includes forming a first electrode configured to partially cover a substrate, forming an organic light-emitting layer configured to cover the first electrode, forming an optically transparent second electrode that lies on a side of the organic light-emitting layer opposite the side adjacent to the first electrode and is superposed on a current-carrying portion of the first electrode in plan, forming a third electrode in at least part of a region that is not superposed on the current-carrying portion in plan, the third electrode being electrically connected to part of the second electrode, forming an optically transparent protective layer configured to cover at least a region of the second electrode where the second electrode is not superposed on the third electrode in plan, and removing part of the organic light-emitting layer with the third electrode and the protective layer serving as a mask.

Provided is an illuminating device wherein replacement of a light source is facilitated and generation of luminance nonuniformity is suppressed. An illuminating device (10) is provided with a light source module (5) which is attached to a bottom section (1a) from a rear surface side of a case member (1). On a prescribed section on the bottom section (1a), a through hole (1b) is formed, and a prescribed section of the through hole protrudes to the side of a storing space (10a). An LED (6) is arranged to face a light incoming surface (3a) of a light guide plate (3) by having the LED (6) protrude to the side of the storing space (10a) through the through hole (1b).

The present invention provides a light diffuser plate, a surface emission light source apparatus and a liquid crystal display apparatus which are capable of preventing the generation of annoying noise in an area of contact between the light diffuser plate and a lamp box. The present invention relates to a surface emission light source apparatus comprising a plurality of light sources disposed at a distance from each other in a lamp box, that is made of a resin and has an open front side, and a light diffuser plate that is made of a resin and is disposed on the front side of the frame of the lamp box so as to close the opening of the lamp box, wherein at least a part of the back surface of the light diffuser plate that makes contact with the front surface of the frame is formed as a matted surface, the matted surface has an arithmetic mean surface roughness Ra in a range from 0.8 to 15 mum and a mean surface irregularity interval Rsm in a range from 100 to 300 mum.

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).

The optical waveguide sheet of the present invention is 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 hard coat layer laminated on the back face side of the optical waveguide layer, an average thickness of the optical waveguide sheet being no greater than 600 μm. An average thickness of the hard coat layer is preferably from 2 μm to 20 μm. The optical waveguide sheet preferably further includes a lower refractive index layer that is laminated on the back face of the optical waveguide layer and has a refractive index lower than that of the optical waveguide layer, and the hard coat layer is preferably laminated on the back face of the lower refractive index layer.

A thin direct-under backlight capable of realizing a high uniformity ratio of luminance by suppressing periodic unevenness of luminance on the emission surface while maintaining a high utilization ratio of light beam through contrivance in design of the direct-under backlight. In the direct-under backlight comprising a plurality of liner light sources arranged parallel, a reflector and a light diffuser, a prism array of saw-tooth cross-section is provided on at least one major surface of the light diffuser. If the vertex angle of the prism array on the light diffuser is y (degree), the distance between the centers of adjacent linear light sources is a (mm), and the distance between the center of the linear light source and the surface of the light diffuser on the light source side is b (mm), the following relation is satisfied: 80 (b / a)+15<y<180 (b / a)+70.

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 present invention provided a light diffusion sheet which is capable of enhancing heat resistance, thermal dimensional stability and weather resistance while retaining transparency and which is less liable to sag, yellowing or the like even under heat generated by a lamp or ultraviolet ray irradiation, and provided a backlight unit which reduces luminance nonuniformity by using the light diffusion sheet. A light diffusion sheet is provided with a transparent base layer and a light diffusion layer stacked on the front surface of the base layer. The light diffusion layer contains a light diffusion agent in its binder. The binder is formed of a polymeric composition containing polyester polyol or acrylic polyol and a minute inorganic filler, wherein the average particle size of the minute inorganic filler is 5 nm to 50 nm.

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.