Sharp Kabushiki Kaisha Corporation

Kentaro Kamada

Keiji Hayashi

Mitsuhiro Moriyasu

Ryoh Hatakeyama

Daisuke Teragawa

Keitaro Matsui

Masanobu Harada

A backlight unit includes LEDs, a light guide plate, a wavelength converter, and an LED controller. The LEDs include end-side LEDs arranged at ends in the direction of arrangement and a center LED arranged at the center in the direction of arrangement. The light guide plate includes a light entering end surface and a light exiting plate surface. The light entering end surface extends along the direction of arrangement. The wavelength converter extends along the direction of arrangement and is interposed among the LEDs and the light entering end surface. The wavelength converter includes a phosphor configured to wavelength-convert the light from the LEDs. The LED controller is configured to control the amount of light emitted by each LED per unit time such that the amount of light emitted by at least one of the end-side LEDs than the amount of light emitted by the center LED.

Lighting device, display device, and television device

A lighting device includes LEDs (a light source), a wavelength conversion sheet (a wavelength conversion member)containing phosphors for converting light emitted by the LEDswith wavelength conversion, and a diffuser platethat exerts diffusing effects on the light from the LEDsand is thicker than the wavelength conversion sheetand disposed on a light exit side with respect to the wavelength conversion sheet

A lighting deviceincludes LEDs, a chassisincluding a bottom plateand having the LEDstherein, a wavelength conversion sheetdisposed away from the LEDson a light exit side and containing phosphors for converting wavelength of light emitted by the LEDs, a reflection sheetconfigured to reflect the light emitted by the LEDstoward the wavelength conversion sheet, the reflection sheetincluding at least a bottom reflection portiondisposed along the bottom plate, and an extended reflection portionextending from the bottom reflection portiontoward the wavelength conversion sheet, and a color exhibit memberdisposed on a portion of the extended reflection portionand configured to exhibit a tint closer to a tint of the light emitted by the LEDsin comparison to the bottom reflection portion

The backlight device () of the present invention is provided with: a heat-dissipating member () having a bottom surface part (); a light guide plate () that has a light-receiving face () on the side face thereof and that is arranged such that the back surface of the plate faces the front of the bottom surface part (); and LED light-source () that is arranged opposite to the light-receiving face () above the front surface of the bottom surface part (); a reflective sheet () that is arranged to be in contact with the back surface of the light-guide plate (); and a protruding part () that is formed so as to protrude from the front surface of the bottom surface part () between the LED light source () and the light-receiving face (), the protruding part () being higher than the back surface of the light guide plate ().

Illumination device, display device, and television receiving device

In order to prevent unevenness in planar light and reduce power consumption, a backlight unit A that emits planar light towards a front side thereof has a light-shielding partprovided on a packageat least on a front side of the backlight unit. The packagehas an LED modulethat surrounds an LED chipthat is a light source, and the light-shielding partprotrudes towards a light receiving faceof a light guide plate

Backlight unit and liquid crystal display apparatus

A technology to suppress or prevent an uplift of a reflection sheet included in a direct type lighting unit is provided. A direct type backlight unit according to the present invention includes an LED board, an LEDarranged on a surface of the LED board, a reflection sheetarranged on the surface of the LED board. The reflection sheethas a through holethrough which the LEDis passed. The reflection sheetis arranged such that a partof a peripheryof the through holeis located between a light emitting surfaceof the LEDand the LED board

Lighting device, display device and television device

The backlight device () is provided with a bottom plate (), a light-guide plate () that has a light-receiving face () on a side face and that is arranged such that the back surface of the plate is oriented to face the front of the bottom plate (), an LED light-source () that is arranged opposite to the light-receiving face () on the front surface of the bottom plate (), a reflective sheet () that is arranged to be in contact with the bottom surface of the light guide plate (), a protruding member () that is formed so as to protrude from the front surface of the bottom plate () and that has, as top surfaces, a first surface () provided so as to contact the surface of the reflective sheet () on the side opposite of the bottom plate and a second surface () that is separated from the first surface () by a step () and that, between the light-receiving face () and the LED light source (), is higher than the back surface of the light guide plate ().

A technology for restricting or suppressing a lift of a reflection sheet in a direct backlight device is provided. The direct backlight device according to the present invention includes an LED board, LEDs, lenses, legsand, a reflection sheet. The LEDsare arranged on a surface of the LED board. The lensescover the respective LEDsfrom the light exit side and diffuse light from the LEDs. The legsandare arranged on the surface of the LED boardand support the lenses. The reflection sheethas through holes. The LEDsand the legsandare passed through the respective through holesof the reflection sheet. The reflection sheetincludes projectionsandprojecting inward from an edge of the corresponding through hole. The three projectionsandare held between the three legsand

The color gamut of a liquid crystal display device of the field sequential system is sufficiently improved. A liquid crystal display device according to the present invention is a liquid crystal display device of the field sequential system including: an illumination element including a first light source for emitting light of a first color, a second light source for emitting light of a second color which is different from the first color, and a third light source for emitting light of a third color which is different from the first and second colors, the illumination element being capable of emitting light of the first, second, and third colors independently by time division; and a liquid crystal display panel for modulating the light emitted from the illumination element. The liquid crystal display panel of the liquid crystal display device according to the present invention includes a first color filter exhibiting a high transmittance for light of the first color.

Liquid crystal display device having illumination element emitting colors independently via time division

A display apparatus can perform a high quality moving picture display and provides improved color purity, and includes an illumination device that prevents and minimizes light unevenness in the form of a lamp image. The display apparatus includes an illumination device in which a first scattering layer, a first light-condensing layer, a second scattering layer, and a second light-condensing layer are arranged so as to cover a light-radiating surface of a light source unit including a first light source that emits light of a first color and a second light source that emits light of a second color complementary to the first color, a gate driver arranged to sequentially select each one of scanning lines at a cycle of 0.5 frames, a source driver that, at a first half of one frame time period, writes a data signal into each in a group of pixels of the first color, and at a latter half thereof, writes a data signal into each in groups of pixels of other two colors, and a switch circuit that, at the first half of one frame time period, switches on the first light source while switching off the second light source, and at the latter half of the time period, switches on the second light source while switching off the first light source.

Illuminator and display having same

An illumination device for a display device has cold cathode tube lamps capable of being driven in parallel, a first holding member having holders equivalent in number to the number of the cold cathode tube lamps and each holding one end of each lamp, a second holding member having holders equivalent in number to the number of the cold cathode tube lamps and each holding the other end of each lamp and an electric power source device. Harness lines connected to one end of the electric power source device and the first holding member are interconnected at multiple points, and harness lines connected to the other end of the electric power source device and the second holding member are interconnected at multiple points. This reduces uneven brightness. The illumination device for a display device can be used as backlight for a liquid crystal TV.

Illumination device for display device and display device with the same

Disclosed is a lamp holding tool provided with lamp holding sections arranged in a same direction at fixed intervals, and flat-board like connecting sections whereupon the lamp holding sections are fixed. The lamp holding section has a shape which can abut to the lamp on different parts depending on relative angles to the lamp. As for the lamp holding sections, a distance between the lamps is changed by an angle formed by the arrangement direction of the lamp holding sections and the axis direction of the lamps.

Lamp holder, backlight device and liquid crystal display device

A light source device and a display device are disclosed of which high display quality can be maintained by correcting luminance or a color tone without making a user feel strangeness or inconvenience. A light source device is disclosed in at least one embodiment, including light source blocks each of which has red-color light-emitting diodes, green-color light-emitting diodes and blue-color light-emitting diodes and is capable of independently adjusting luminance of the three color diodes, a photo-receiving mechanism arranged to photo-receive light, and a correcting operation control mechanism arranged to calculate correction amounts of the luminance of the light sources in each of the blocks based on photo-receiving amounts of the photo-received light in order to maintain uniform luminance or a uniform color tone among the blocks, wherein the mechanism controls the mechanism to photo-receive the light when a termination operation of the light source device is performed.

Light source device, a display device and a television receiver

A diffusion plate (DL) allowing the light from a fluorescent tube () to transmit therethrough is held on a support surface (S,S) forming one surface of a side holder (SF). In particular, a support frame (FM) which also plays the role of the side holder (SF) supports the diffusion plate (DL) of a shape of which the long dimension and short dimension parts can be defined, for example, a rectangular shape at only two short dimension parts on its outer edges opposed to each other.

Backlight unit and liquid crystal display

In a backlight unit including fluorescent tubes and a diffusion unit overlapped with each other, optical materials with different transmittances are contained in a holding layer positioned between a diffusion plate and a lenticular lens layers.

Growing community of inventors

Osaka, Japan

Kentaro Kamada