Sharp Kabushiki Kaisha Corporation

Tomoyuki Ichiza

Motoyuki Oniki

Masahiro Ide

Shogo Fukuda

Toshimasa Ogawa

Disclosed is a display apparatus, wherein a holding frame includes a placing portion which protrudes in a direction substantially perpendicular to a back surface of a display panel (a liquid crystal panel), and is long in a direction along a side face of the display panel (the liquid crystal panel), such that a heat dissipater (a heat spreader) is placed on the placing portion in a longitudinal direction thereof, the substrate (a base substrate) has information (rank information) regarding the light emitting element (a white LED) described on the other surface thereof, and the heat dissipater (the heat spreader) has an opening portion (a window portion) formed in a surface thereof to which the substrate (the base substrate) is fixed at a position corresponding to a position in which the information (the rank information) is described.

Display apparatus and television receiving apparatus

This LED lighting device makes a maximum current to minimum current flowing in an LED a target proportion regardless of LED driving circuit performance and without erroneous operation. An LED lighting device () is provided with: an LED circuit () that includes at least one LED (-); a bypass means () inserted in parallel with the LEDs (-); and an LED driving circuit () that supplies current by duty control to the LEDs (-) and the bypass means (). When a prescribed minimum current flows in the LED circuit (), the LED driving circuit () supplies current in which a portion of current flowing in the bypass means () is added to this minimum current and carries out control of the added current by a switching element (TR) connected in series to the LED circuit () and the bypass means ().

LED lighting device

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.

Growing community of inventors

Osaka, Japan

Tomoyuki Ichiza