Sharp Kabushiki Kaisha Corporation

Mitsuhiro Moriyasu

Hideyuki Chikazawa

Keiji Hayashi

Kentaro Kamada

Masaki Shimizu

Ryoh Hatakeyama

Toru Namiki

A frame is narrowed by a technically reasonable design, without technical limitation for frame narrowing which tends to be considered troublesome when bent-tube type fluorescent tubes having U-shaped bent portions are to be alternately arranged to face each other nor without the trouble of storing the bent-type fluorescent tubes in a chassis while being manufactured. A backlight device () is provided with a backlight chassis () wherein a plurality of fluorescent tubes () having electrodes are arranged and stored, and an inverter circuit board is arranged on the rear surface of the backlight chassis (). Furthermore, the backlight device () is provided with a storing section (), which is attached to the backlight chassis () by storing a conductive holding section for holding the electrodes. With the storing section () attached to the backlight chassis (), the electrodes of the fluorescent tubes () are electrically connected to a light source lighting circuit board arranged on the rear surface of the backlight chassis ().

Backlight device and liquid crystal displaying device

In a lighting unit, fluorescent lights and LEDs of different spectroscopic characteristics are alternately arranged in a direction X on an irradiation plane. Light sources of equal light intensity are arranged in a certain pitch for the fluorescent lights such that a uniform light amount is achieved around end portions in the direction X. The LEDs include LEDs aligned on a bottom surface of a chassis and LEDs arranged on an inner sidewall surface of the chassis. As a result, a lighting unit having a uniform amount of light across an entire irradiation plane is achieved.

Lighting unit including alternately arrange first and second light sources, backlight unit, liquid crystal display device

In a lighting unit, fluorescent lights and LEDs having different spectroscopic characteristics are alternately arranged in a direction X on an irradiation plane. The fluorescent lights are arranged in certain intervals so as to provide uniform light intensity even around the end portions of the direction X. The LEDs installed at the ends of the direction X have a light intensity that is weaker than that of other LEDs in order to provide uniform light intensity around the end portions. As a result, the lighting unit provides uniform light intensity across the entire irradiation surface.

Lighting unit, backlight unit, and liquid crystal display device

When the temperature value detected by a temperature detecting circuit is lower than a previously designated set temperature value, cathode fluorescent lamps (CFLs) are operated to illuminate with a duty ratio of 100% so as to enhance the brightness. When the detected temperature value has become equal to or higher than the previously designated set temperature value, CFLs are operated to illuminate by changing the duty ratio into a user set value.

Liquid crystal display device

In order to control light emission of light emitting diodes, current dividing circuits are used to supply currents of a substantially fixed level to all lines. Light emitting diodes are arranged in groups of a predetermined number of LEDs in series, and sets of the light emitting diodes connected to the first line and sets of the light emitting diodes connected to the second line are laid out on the same straight line so as to form a single row. Substrates with these formed thereon are arranged adjacent to each other in the direction of the rows, so that sets of the light emitting diodes connected to the first line and sets of the light emitting diodes connected to the second line are arranged alternately. With this configuration, it is possible to provide a backlight device with a plurality of LED arrays arranged thereon, which can uniformly illuminate the entire screen with light from the LED arrays.

Backlight device and liquid crystal display device

In a backlight device according to the present invention including a light emitting diode substrate, which has a light emitting diode and is placed on the back side of a panel module having an image display surface on the front side, and a reflection sheet for reflecting light emitted by the light emitting diode to the panel module, the reflection sheet is placed on the front side of the light emitting diode substrate, and the reflection sheet is provided with a through-hole into which the light emitting diode is inserted, so as to reduce brightness unevenness and color unevenness on the image display surface resulting from the light emitting diode substrate.

Backlight device and display device comprising backlight device

To provide a backlight unit capable of improving color purity of a prescribed emission color as well as obtaining a uniform emission colors in the entire device, and a liquid crystal display device comprising thereof. Backlight unit B comprises: a LEDfor compensating emission intensity of red wavelength light of a fluorescent tube, being arranged in between each of a plurality of said fluorescent tubesarrayed in up and down directions, and a LEDfor compensating emission intensity of red wavelength light of a fluorescent tube, being arranged in the outside of each of two fluorescent tubesarranged in the outermost of a plurality of said fluorescent tubes

Growing community of inventors

Suzuka, Japan

Mitsuhiro Moriyasu