Power module and display device

Abstract

There are provided a power module and a display device. There is provided the power module for a display device that includes a panel, a backlight unit supporting the panel and including a light source, and a conductive back cover coupled to the backlight unit, the power module including: a circuit board supplying power to the light source included in the backlight unit; a transformer mounted on the circuit board and supplying power to the circuit board; and a shielding plate mounted on the circuit board and covering, in a non-contact manner, the upper surface of the transformer opposed to the lower surface 401 of the transformer facing the surface of the circuit board. There is provided a display device including such a power module.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priorities of Korean Patent Application Nos. 10-2009-0049200 filed on Jun. 3, 2009 and 10-2009-0119906 filed on Dec. 4, 2009, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a power module and a display device that can be applied to an LED TV, and the like.[0004]2. Description of the Related Art[0005]Recently, a Flat Panel Display (FPD) which is a new technology which is appropriate for a multi-media system having a high resolution and a large-sized screen has become prominent in the display industry, as a replacement for a Cathode Ray Tube (CRT).[0006]In particular, in the case of a large-sized display, a Liquid Crystal Display (LCD) TV has become prominent and has been expected to grow in prominence henceforth in view of price and marketability.[0007]A Cold...

AI Technical Summary

Benefits of technology

The present invention provides a power module and a display device that can reduce power loss, malfunctions, and switching loss of a transformer by blocking electro-magnetic interference between the back cover and the transformer. This is achieved by using a conductive back cover that covers the entire circuit board and a shielding plate that covers the upper surface of the transformer. The shielding plate can be made of a conductive material or an insulation plate with a shielding member, such as a shielding member attached to the inner side surface of the back cover or a fastening sill inserted into a fastener on the circuit board. The use of a shielding plate and a resonant type transformer can improve the efficiency and reliability of the power module and display device.

Problems solved by technology

Under the circumstances, as the transformer and the back cover have been moved closer to each other, the following problems may arise.

First, in the case that the transformer is a resonant type in which a zero voltage switching (ZVS) operation is performed, when the conductive back cover is closer to the transformer, capacitance is formed between the transformer and the back cover and thus, switching loss is generated and a resonant frequency is shifted due to such capacitance, thereby causing a fatal problem in that the transformer malfunctions.

Also, when the transformer is closer to the back cover, magnetic flux is formed from the transformer to the back cover, thereby causing a problem in which power consumption is generated through the conductive back cover.

That is, when the back cover is a conductive back cover such as an iron plate, the magnetic flux generated by the transformer is leaked to the back cover due to magnetic interference between the transformer and the conductive back cover of the circuit board during the operation of thereof, thereby causing problems wherein the overall power consumption is increased and the temperature of the transformer is raised due to power consumption generated from the back cover.

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