Sharp Kabushiki Kaisha Corporation

Yuhsaku Ajichi

Takeshi Masuda

Yukihide Kohtoku

Tomohiko Yamamoto

Naoto Inoue

Kenji Nishida

Yukihiro Sumida

Tetsuya Ueno

Tomoki Kubo

Occurrence of coloration at a screen end portion is suppressed when a backlight device having a configuration combining a blue LED and a wavelength conversion sheet is adopted. In a backlight device () adopting a configuration combining a blue LED () and a phosphor sheet () in order to obtain white light, a reflection partition () is provided on an LED substrate () so as to surround the blue LED () (more specifically, so as to surround an LED unit including one or a plurality of blue LEDs ()). A surface of the reflection partition () is formed of a reflection material. A height and an angle of the reflection partition () is designed so that light emitted from the blue LED () corresponding to each area does not reach other areas.

Backlight device, and display apparatus including same

Object: To provide a backlight device for a liquid crystal display device which can suppress occurrence of power loss in any of light emitting bodies, and a liquid crystal display device including the backlight device. Solution to Problem: In a cluster (), arranged are two magenta light emitting bodies () including a blue light emitting element () with high drive voltage and red phosphors () covering the blue light emitting element (), two green light emitting bodies (), and one blue light emitting body (). With this configuration, since two blue LED elements () are implemented also in two magenta light emitting bodies (), the drive voltage of the magenta light emitting bodies () is substantially equal to the drive voltage of the green light emitting bodies () and the blue light emitting body ().

Backlight device and liquid crystal display device including same

Provided is a display device and a display method for the display device with which a three-dimensional stereoscopic image with reduced crosstalk and a two-dimensional planar image with high brightness can be displayed. In a display device that is capable of displaying an stereoscopic image by displaying an image for the right eye and an image for the left eye, pixel lines for the right eye for displaying the image for the right eye and pixel lines for the right eye for displaying the image for the left eye are alternately arranged in the vertical direction with black pixel lines for displaying a black image therebetween.

Display device and display method

A backlight unit includes a light source; a light guide; a gap retainer including two plate-like portions orthogonal to each other, the light guide being placed over a first plate-like portion of the two plate-like portions, the light source being attached to a side of a second plate-like portion of the two plate-like portions; a chassis including a frame-shaped side wall portion and a bottom portion, the gap retainer being positioned with respect to the chassis such that the second plate-like portion and the side wall portion face each other and the first plate-like portion and the bottom portion face each other; and an elastic body urging the gap retainer in a direction away from the side wall portion. The gap retainer includes a stopper to maintain a gap between the light source and the side edge surface of the light guide.

Backlight unit including light guide and gap retainer

A light guide element includes a light-emitting section including a light-emitting surface, a light guide section, and a diffusing device provided in at least part of a region extending from a boundary surface between the light-emitting section and the light guide section, to point halfway between the boundary surface and an end of the light guide section closer to the light source. The light guide element might be used to form a backlight for a liquid crystal display device.

Light guide elements for display device

An object is to implement a narrowed picture-frame while suppressing the occurrence of light leakage and a reduction in luminance in an edge-light type backlight device. A backlight device is composed of LEDs (); a side chassis () supporting a board having the LEDs () mounted thereon; a light guide plate () for allowing light emitted from the LEDs () to exit toward a liquid crystal panel in a planar manner; a reflection sheet () for allowing light traveling toward a back surface side within the light guide plate () to be reflected thereby; optical sheets () including a reflection type polarizer (), a prism sheet (), and a diffuser (); and a top chassis () disposed on top of the optical sheets (). Black printing () is provided in a part of the region of the diffuser (). A length of the reflection type polarizer () is longer than a length of the light guide plate () such that an edge of the reflection type polarizer () is located closer to a side of the LEDs () than is an edge surface of the light guide plate ().

Planar illumination device and display device provided with the same

An illumination device () includes a plurality of light source units (BLU) each having a light guide plate () and a plurality of light sources (). The light guide plate () has an illumination region () through which incident beams of light from the light sources () are emitted outward and a light guide region () through which the incident beams of light from the light sources () are guided toward the illumination region (), with the light guide region () and the illumination region () laid side-by-side. The illumination region () is divided into a plurality of light-emitting sections by slit sections (), provided in such a way as to extend along directions of optical axes of the light sources (), which restrict transmission of light. At least one of the light sources () is provided to each of the light-emitting sections in such a way as to be placed side-by-side along the light guide region (). Light source units () adjacent to each other along the directions of the optical axes of the light sources () are disposed so that the illumination region () of one of the light source units (BLU) covers at least a part of the light guide region () of the other light source unit (BLU). This makes it possible to retain the strength of the illumination device as a combination of light guide blocks while reducing leakage of light into an adjacent area.

Illumination device, display device, and light guide plate

A tandem type backlight comprises plural light-emitting units () including at least one point light source () and a light guide plate () for causing light from the at least one point light source to be diffused and surface-emitted. In each of the light-emitting units (), a length X of a light guide area () is set so that an area, on a boundary surface between a light-emitting area () and the light guide area (), of a cross-section of a light beam that is emitted from the at least one point light source () and is diffused in the light guide plate () is equal to or larger than an area of the boundary surface (interface). Moreover, a length X, in a length direction D, of the light guide area is smaller than a length Y, in the length direction D, of the light-emitting area.

Illuminating device and liquid crystal display device

A backlight (illumination device;) of the present invention includes: multiple light sources (); multiple light guide plates (, . . . ) for causing surface emission of light from the light sources (); and a diffusing plate () for diffusing light from the light guide plates (, . . . ), the diffusing plate () being provided so as to be separate from and face the light guide plates (, . . . ). Each of the light guide plates (, . . . ) includes: a light-emitting section () having a light-emitting surface (); and a light guide section () for guiding, to the light-emitting section (), light from the light sources (), a light-emitting section () of the first light guide plate () being provided above a light guide section () of the second light guide plate () adjacent to the first light guide plate (). A light amount adjusting section () for reducing the amount of light incident on it is provided so as to be separate from the diffusing plate () and so that the orthogonal projection of the light amount adjusting section () onto the light-emitting region covers the boundary between any adjacent light guide plates (, . . . ). This allows for production of a tandem-type illumination device having further improved luminance uniformity.

Illumination device and liquid crystal display device

An illumination device includes a plurality of light source units () each having a light guide plate and at least one light source. The light guide plate is provided with an illumination region () through which an incident beam of light from the at least one light source is emitted outward and a light guide region () through which the incident beam of light from the at least one light source is guided toward the illumination region (), with the illumination region () and the light guide region () laid side-by-side. Light source units () adjacent to each other along a direction of an optical axis of the at least one light source are disposed so that the illumination region () of one of the light source units () covers at least a part of the light guide region () of the other light source unit (). A diffuse reflection sheet () and a specular reflection sheet () or a light absorption sheet are provided between the light guide plate (LG(k)) of the one of the light source units () and the at least one light source (BL(k+1)) of the other light source unit () in such a way as to be put on top of each other. This makes it possible to suppress uneven irradiation and improve luminance uniformity and color-mixing properties of a tandem illumination device having light guide plates disposed in such a way as to be overlapped.

Illumination device and display device

Each of light guides () has: a reflection surface (); and a light emitting surface () that is opposite to the reflection surface () and is not covered by a neighboring light guide (). The light emitting surface () is made up of a first emitting surface () and a second emitting surface (). The first emitting surface () is substantially parallel with the reflection surface (). The second emitting surface () is substantially parallel with an irradiated surface. The each of the light guides () is provided with microprisms () serving as diffusing means at least in a first emitting surface region () in which there is the first emitting surface ().

Illumination device, surface light source device, and liquid crystal display device

A backlight includes a spot-shaped light source and a light guide unit including a light guide arranged to diffuse and surface-emit light from the light source. The light guide unit includes a substrate to dispose and fixate the light source and the light guide. Protruding sections are provided on an incident surface of the light guide upon which light from the light source is incident, so as to protrude in a direction opposite to an incident direction of the light from the light source. Further, the light guide is fixedly disposed on the substrate by connecting the protruding sections to the substrate. As a result, with the illumination device including the light source and the light guide, it is possible to achieve an illumination device with a higher light use efficiency and higher luminance homogeneity.

A backlight (illumination device) of this invention includes a plurality of light source units () each including (i) at least one light source () and (ii) a light guide body () for surface-emitting light which has come from the at least one light source. In the light source unit (), the light source is disposed at one end portion of the light guide body (), and another end portion of the light guide body (), opposite to the one end portion, has a thickness from 0.05 mm to 0.15 mm. As a result, it is possible to further improve luminance uniformity in an illumination device including a plurality of light guide bodies.

A backlight (illumination device)is disclosed including: light sources (); light guide plates () for causing surface emission of light from the light sources (); and a diffusing plate () for diffusing light from the light guide plates (), the diffusing plate () facing a light-emitting surface () of each of the light guide plates () at a predetermined distance. The illumination device further includes at least one maintaining section between the light-emitting surface () of the light guide plate () and the diffusing plate (), the maintaining section () maintaining the predetermined distance. The maintaining section () is provided on either of first and second end sections of the light-emitting surface () of a light guide plate (), the first end section being closer to a corresponding light source (), the second end section being farther from the corresponding light source ().

A backlight (illumination device) according to the present invention includes a plurality of light sources, and a light guiding body for causing light emitted from the light sources to be emitted from a light emitting surface. The light sources are provided inside the light guiding body, and emit light in directions which are substantially parallel to a light emitting surface of the light guiding body. At least two of the plurality of light sources emit the light in directions which are different from each other. More specifically, at least two of the plurality of light sources are provided so as to face each other, and provided so that one of the plurality of light sources emits light toward the other one of the plurality of light sources, and vice versa.

Growing community of inventors

Osaka, Japan

Yuhsaku Ajichi