Sharp Kabushiki Kaisha Corporation

Kohei Nanbu

Masaki Shimizu

Masahiro Arai

One embodiment of the present invention discloses a transmissive display device including a display panel, a backlight including a plurality of fluorescent tubes, an inverter section that supplies a driving voltage to the backlight, and an inverter control section that controls whether to drive or stop the inverter section and stops the inverter section when at least one of the fluorescent tubes is not lighting. The display device includes a mode determination section that determines whether a driving mode of the display device is a normal mode or a maintenance mode. Upon receiving, from the mode determination section, a signal indicating that the drive mode is the maintenance mode, after having stopped the inverter section due to a fact that at least one of the plurality of fluorescent tubes is not lighting, the inverter control section drives the inverter section again. Such a configuration makes it possible to, in a display device in which a backlight including a plurality of fluorescent tubes is used, make maintenance work more efficient by identifying a failed fluorescent tube while the backlight is not lighting.

Display device and method for driving display device

One embodiment of the present invention discloses a backlight control device that provides PWM control inverters with PWM signals generated in accordance with a dimming level input through a light receiving section that receives infrared light, the inverters causing fluorescent lamps that emit visible light and infrared light to illuminate. The backlight control device includes a phase adjusting section that changes a phase difference between a first PWM signal for driving a first lamp group and a second PWM signal for driving a second lamp group according to the dimming level when the dimming level is at least in a predetermined range of all dimming levels, the first and second lamp groups each including at least one lamp. This provides a backlight control device that enables reduction of faulty operation in an infrared-based apparatus.

Backlight control device and display apparatus including the same

A fluorescent tube is prevented from being wrongly attached and broken when being attached, and luminance nonuniformity of backlight due to luminance difference generated in a tube axis direction of the fluorescent tube is reduced. A backlight deviceis provided with a plurality of fluorescent tubeshaving electrodesat both ends; a bundling memberfor bundling wiringspulled out from the electrodeon one side of two or more of the fluorescent tubes; and a conducting meansfor achieving conduction between the electrodes of the two fluorescent tubes among the fluorescent tubesby being connected with the bundling member. The conducting meanspermits a current to be carried between the electrodes of the two fluorescent tubes, which are bundled by the one bundling member, and the conducting means are arranged on inverter circuit substrate, respectively, not to be adjacent to each other.

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Osaka, Japan

Kohei Nanbu