32results 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 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.

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.

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 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.

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.