Sharp Kabushiki Kaisha Corporation

Masahiro Ide

Hideki Shioe

Motoyuki Oniki

Tomoyuki Ichiza

Naohiro Kamitsuchihashi

A safety protection apparatus of a display apparatus includes an input voltage detection unit configured to generate input voltage information representing an input voltage, a luminance information generation unit (a dimming signal generation unit) configured to generate luminance information according to the input voltage, and a first check unit configured to check whether there is an abnormality in a correspondence relationship between the input voltage information and the luminance information.

Display apparatus, control method for controlling display apparatus, and storage medium

Provided are an LED control device and a liquid crystal display apparatus, wherein energy loss or noise (humming sound) to be generated upon switching the control of power supplying from a power supply device to a plurality of LED groups, between constant current control and constant voltage control, can be alleviated. In a configuration wherein power to be supplied from one power supply device, to which a plurality of LED groups are connected in parallel, is controlled with constant current control wherein the voltage at the end section at the cathode side of the LED group to be turned on is to be maintained at a predetermined first voltage value, when at least one of the LED groups is to be turned on, and controlled with constant voltage control wherein the voltage at the end sections at the anode side of the LED groups is to be maintained at a predetermined second voltage value, when all the LED groups are to be turned off, a phase difference of 2&#x3c0;/n (n is the number of LED groups) is made to be generated between PWM signals corresponding to each of the LED groups.

LED control device and liquid crystal display apparatus

An LED drive circuit () for driving an LED circuit () includes: a constant current driver () including transistors (-) whose collector terminals are respectively connected with LED rows (-) connected with each other in parallel and whose emitter terminals are grounded; and an LED drive control section () for setting a voltage to be commonly applied on the LED rows (-), the setting being performed in accordance with a maximum base current out of base currents of the transistors (-).

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Osaka, Japan

Masahiro Ide