Power supply circuit and image display apparatus using the same

Abstract

It is an object of the present invention to provide an image display apparatus which enables cost reduction while being free from electromagnetic interference problems.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, objects and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings wherein:

FIG. 1 is a diagram showing a configuration of a display apparatus with a plasma display panel according to the embodiment of the present invention;

FIG. 2 is a schematic diagram showing a circuit configuration in the display apparatus with the plasma display panel shown in FIG. 1;

FIG. 3 is a perspective diagram of the appearance of a power supply circuit and electromagnetic shielding means in the display apparatus with the plasma display panel shown in FIG. 1;

FIG. 4 is a diagram showing an example of the configuration of the power supply circuit and a power supply unit in the display apparatus with the plasma display panel shown in FIG. 1.

FIG. 5 is a diagram showing an example of the configuration of a switch used in the power supply circuit shown in FIG. 4.

FIG. 6 is a schematic diagram of a circuit configuration of a conventional display apparatus with a plasma display panel.

FIG. 7 is a diagram showing an example of the configuration of a conventional display apparatus with a plasma display panel.

Claims

1. A power supply circuit for an image display apparatus, that is adapted to suppress leakage of electromagnetic waves generated in the apparatus to the outside of the apparatus, the power supply circuit comprising: an AC inlet to which a power cord is connected to input power supplied from an external AC power supply;a filter circuit to which an inductance element is connected to attenuate electromagnetic waves;a switch that switches on/off an AC output supplied from the filter circuit; anda circuit board on which the filter circuit is formed and the AC inlet and the switch are mounted.

2. An image display apparatus that displays an image based on an image signal, the apparatus comprising: a power supply circuit including, on a single circuit board, an AC inlet, a filter circuit, and a switch, the AC inlet to which a power cord is connected to input power supplied from an external AC power supply, the filter circuit to which an inductance element is connected to attenuate electromagnetic waves, the switch that switches on/off the AC output supplied from the filter circuit;electromagnetic shielding means for covering the circuit board to shield electromagnetic waves;a display unit that displays an image;a drive circuit to which the power based on the output of the power supply circuit is supplied to drive the display unit based on an image signal; anda rear cover arranged at the rear side of the display unit to cover the power supply circuit, the display unit, and the drive circuit.

3. The image display apparatus as defined in claim 2, wherein: the electromagnetic shielding means is formed of a first shielding section that surrounds the lateral side of the circuit board and a second shielding section that covers the upper side of the circuit board; andthe second shielding section is composed of a part of the flat section of a rear cover provided at the rear side of the display unit of the display apparatus.

4. The image display apparatus as defined in claim 2, wherein the switch has an L-shaped arm for operation and is activated by a force transmitted by the arm.

5. The image display apparatus as defined in claim 2, wherein the display unit is a plasma display panel that displays an image by means of electric discharge between electrodes arranged in a matrix form.

6. The image display apparatus as defined in claim 3, wherein the display unit is a plasma display panel that displays an image by means of electric discharge between electrodes arranged in a matrix form.

7. The image display apparatus as defined in claim 4, wherein the display unit is a plasma display panel that displays an image by means of electric discharge between electrodes arranged in a matrix form.