Heat radiating printed circuit board and chassis assembly having the same

The present invention relates to a heat radiating printed circuit board (PCB) and a chassis assembly having the same, the heat-radiating PCB characterized by: a circuit pattern unit mounted with a light emitting diode; and one or more mounting units bent from the circuit pattern unit to be fixed at a chassis providing a lightguide path of a backlight unit, where one of the mounting units is mounted to the chassis via a thermal interface material to maximize the heat radiating characteristic of the PCB and to reduce the manufacturing cost.

CROSS-REFERENCE TO RELATED APPLICATION

This application is the U.S. national stage application of International Patent Application No. PCT/KR2010/006905, filed Oct. 8, 2010, which claims priority to Korean Application No. 10-2009-0095846, filed Oct. 8, 2009, the disclosures of each of which are incorporated herein by reference in their entirety.

TECHNICAL FIELD

The present invention relates to a heat radiating printed circuit board and a chassis assembly having the same.

BACKGROUND ART

The LCD (liquid crystal display) is an electrical element that applies to a display device electrical/optical properties of liquid crystal having intermediate physical properties between a solid and a liquid, and displays an image by controlling the amount of light transmitting the liquid crystal.

That is, the LCD is an electrical element that uses a change in transmissivity of the liquid crystal responsive to an applied voltage and changes various electrical information generated by various devices to visual information and transmits the visual information in visual images.

Since the LCD is not a self-illuminating display device, the LCD essentially requires light from an exterior source to display the images. In order to supply the light to the LCD, the LCD includes a BLU (backlight unit) disposed at a rear surface of the LCD as a light source. The BLU is a composite body including a power source circuit for driving the light source and other accessories providing an even plane light source.

The BLU is mounted with a light source such as an LED (light emitting diode) and a PCB (printed circuit board) largely employs a metal material for sustaining heat radiated from a light source element. However, if the heat generated by the light source element is not properly dissipated, there is a risk of the light source element being broken and shortened in life.

FIG. 1is a cross-sectional view of a heat-radiating PCB10and a bracket40mounted at a chassis50which is lightguide path of a backlight unit.

Referring toFIG. 1, the bracket40for fixing the heat-radiating PCB10to the chassis50is separately prepared, and bonded using TIM (thermal interface material20). That is, the heat-radiating PCB and the bracket are bonded to the chassis used as a lightguide path using the TIM20.

However, in a case the heat-radiating PCB10and the bracket40are separately manufactured and bonded using the TIM20, there is a disadvantage of the degraded Heat Transfer Coefficient (Ratio) caused by the TIM20to decrease the heat-radiating effect. There is another disadvantage in that adhesion problem between the heat-radiating PCB10and the bracket50occurs to create a decreased quality.

DISCLOSURE

Technical Problem

The present invention is disclosed to obviate the abovementioned disadvantages, and it is an object to provide a heat-radiating PCB (printed circuit board) and a chassis assembly having the same capable of integrating the heat-radiating PCB and a bracket for maximization of heat-radiating characteristics, and simplifying the structure for reduced material cost.

It is another object to provide a heat-radiating PCB (printed circuit board) and a chassis assembly having the same capable of preventing the heat-radiating PCB from separating from a bracket to minimize the occurrence of quality failure.

Additional advantages, objects, and features of the present invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Technical Solution

In one general aspect of the present invention, there is provided a heat-radiating PCB (printed circuit board), characterized by: a circuit pattern unit mounted with a light emitting diode; and one or more mounting units bent from the circuit pattern unit to be fixed at a chassis providing a lightguide path of a backlight unit, where one of the mounting units is mounted to the chassis via a thermal interface material.

In some exemplary embodiments, the circuit pattern unit may be mounted with a metal substrate sequentially formed with an insulation layer and a circuit pattern, and a light emitting diode.

In some exemplary embodiments, the metal substrate may be an Al substrate.

In some exemplary embodiments, the mounting unit may be formed by bending the metal substrate of the circuit pattern unit.

In some exemplary embodiments, the mounting unit may include a first mounting unit bent from a distal end of the circuit pattern unit to be mounted at a lateral surface of the chassis, and a second mounting unit bent from the other distal end of the circuit pattern unit to be mounted at a floor surface of the chassis.

In some exemplary embodiments, an angle between the first mounting unit and the circuit pattern unit may be a right angle, and an angle between the second mounting unit and the circuit pattern unit may be also a right angle.

In some exemplary embodiments, an angle between the first mounting unit and the circuit pattern unit may be an acute angle or an obtuse angle, and an angle between the second mounting unit and the circuit pattern unit may be a right angle.

In some exemplary embodiments, the first mounting unit and the second mounting unit may be bent in opposite direction.

In some exemplary embodiments, the first mounting unit and the second mounting unit may be bent to face in the same direction.

In another general aspect of the present invention, there is provided a chassis assembly, characterized by: a chassis providing a lightguide path of a backlight unit; and a heat-radiating PCB mounted at the chassis, where the heat-radiating PCB includes a circuit pattern unit mounted with a light emitting diode, and one or more mounting units bent from the circuit pattern unit to be fixed at a chassis providing a lightguide path of a backlight unit, and where one of the mounting units is mounted to the chassis via a thermal interface material.

Advantageous Effects

The heat-radiating PCB (printed circuit board) and a chassis assembly having the same according to the present invention have advantageous effects in that the heat-radiating PCB and a bracket are integrated to prevent degraded heat transfer caused by use of TIM (thermal interface material) and to reduce generation of interface, whereby a thermal conduction degradation phenomenon caused by an air layer can be prevented to maximize the heat-radiating characteristics of the heat-radiating PCB.

Another advantageous effect is that a bracket is integrally manufactured with the heat-radiating PCB to simplify the structure and process by dispensing with separate bracket manufacturing process.

Still another advantageous effect is that the TIM is dispensed with between the heat-radiating PCB and the bracket to reduce use of the TIM and to dispense with the bracket, thereby reducing the manufacturing cost.

Still further advantageous effect is that generation of delamination caused by adhesion problem between the PCB and the bracket can be dispensed with.

MODE FOR INVENTION

In the drawings, the size and relative sizes of constituent elements may be exaggerated for clarity and convenience. Furthermore, in describing the present disclosure, detailed descriptions of constructions or processes known in the art may be omitted to avoid obscuring appreciation of the invention by a person of ordinary skill in the art with unnecessary detail regarding such known constructions and functions. Accordingly, the meaning of specific terms or words used in the specification and claims should not be limited to the literal or commonly employed sense, but should be construed or may be different in accordance with the intention of a user or an operator and customary usages. Therefore, the definition of the specific terms or words should be based on the contents across the specification.

FIG. 2is a cross-sectional view illustrating a chassis assembly mounted with a heat-radiating PCB according to a first exemplary embodiment of the present invention. Referring toFIG. 2, a chassis assembly according to an exemplary embodiment of the present invention includes a chassis140and a heat-radiating printed circuit board (PCB)110mounted on the chassis140.

The heat-radiating printed circuit board (PCB)110includes a circuit pattern unit112and mounting units114,116, where the circuit pattern unit112includes a metal substrate sequentially formed with an insulation layer and a circuit pattern, and a chip mounting unit mounted with a light emitting diode120.

The chip mounting unit mounted at the circuit pattern unit112of the heat-radiating PCB110is formed with the light emitting diode120as a light source for the backlight unit. Although the chip mounting unit is preferably mounted with a light emitting diode as a light emitting source, the embodiment is not limited thereto. The embodiment may be applied to where other light emitting sources are mounted as a light source.

The metal substrate is preferably formed with an aluminum material and the embodiment is not limited thereto. That is, the heat-radiating PCB110may be formed in such a manner that an insulation layer and a circuit pattern are sequentially formed on the metal substrate to form a circuit pattern unit, and both ends of the metal substrate is bent to form mounting units114,116.

The mounting units114,116are areas where the circuit pattern unit112is not formed, and may include a first mounting unit114bent from an upper surface of the circuit pattern unit112to be fixed at a lateral surface of the chassis140, and a second mounting unit130bent at a bottom surface of the circuit pattern unit112to be fixed at a floor surface of the chassis140.

That is, the mounting units114,116form the first mounting unit114where one side of the metal substrated is bent to one direction to form the first mounting unit114, the other side of the metal substrated is bent to the other direction to form the second mounting unit116.

The first mounting unit114and the second mounting unit116may be bent in opposite direction from each other. The first mounting unit114is fixed at a distal end thereof to a lateral surface of the chassis140, while the second mounting unit116is fixed at the floor surface of the chassis140.

The second mounting unit116may be bonded to the floor surface of the chassis140using thermal interface material (TIM)130an adhesive, a double-sided tape or other bonding materials or configurations may be used to bond the second mounting unit116and the chassis140in addition to the TIM130.

In a case the heat-radiating PCB110is installed at the chassis140, a space150may be formed between the heat-radiating PCB110and the chassis140.

A right angle θ1 is formed between the first mounting unit114and the circuit pattern unit112and another right angle θ2 is also formed between the second mounting unit116and the circuit pattern unit112. The embodiment is just an example and the angles θ1,θ2 should not be right angles between the two mounting units114,116and the circuit pattern unit112.

As apparent from the foregoing, the heat-radiating PCB according to the present invention is integrally formed with mounting units for mounting the PCB to the chassis, whereby a manufacturing process can be simplified to reduce the manufacturing cost, to prevent the heat transfer from being degraded and to maximize the heat-radiating characteristics.

FIG. 3is a cross-sectional view illustrating a chassis assembly mounted with a heat-radiating PCB according to a second exemplary embodiment of the present invention.

Referring toFIG. 3, the heat-radiating PCB according to the second exemplary embodiment of the present invention may include a circuit pattern unit112formed with a circuit pattern, a first mounting unit114bent from a distal end of the circuit pattern unit112to be fixed at a lateral surface of the chassis140having an obtuse angle θ1 at a rear surface of the circuit pattern unit112, and a second mounting unit116bent from the other distal end of the circuit pattern unit112to be fixed at the floor surface of the chassis140.

A space150may be formed between the PCB110and the chassis, and the chip mounting unit installed at the circuit pattern unit112may be provided with a light emitting diode120as a light source of the backlight unit.

FIG. 4is a cross-sectional view illustrating a chassis assembly mounted with a heat-radiating PCB according to a third exemplary embodiment of the present invention. Referring toFIG. 4, the heat-radiating PCB110according to the third exemplary embodiment of the present invention may include a circuit pattern unit112formed with a circuit pattern, a first mounting unit114bent from a distal end of the circuit pattern unit112to be fixed at a lateral surface of the chassis140, and a second mounting unit116bent from the other distal end of the circuit pattern unit112in the same direction with that of the first mounting unit112to be fixed at the floor surface of the chassis140.

At this time, the first mounting unit114and the second mounting unit116face each other, where an angle between θ1 the first mounting unit114and the circuit pattern unit112may be a right angle, and an angle θ2 between the second mounting unit116and the circuit pattern unit116may be also a right angle.

A space150may be formed between the PCB110and the chassis, and the chip mounting unit installed at the circuit pattern unit112may be provided with a light emitting diode120as a light source of the backlight unit.

FIG. 5is a cross-sectional view illustrating a chassis assembly mounted with a heat-radiating PCB according to a fourth exemplary embodiment of the present invention. Referring toFIG. 5, the heat-radiating PCB110according to the fourth exemplary embodiment of the present invention may include a circuit pattern unit112formed with a circuit pattern, a first mounting unit114bent from a distal end of the circuit pattern unit112to be fixed at a lateral surface of the chassis140and having an obtuse angle θ1 at a rear surface of the circuit pattern unit112, and a second mounting unit116bent from the other distal end of the circuit pattern unit112at a right angle to be fixed at the floor surface of the chassis140.

A space150may be formed between the PCB110and the chassis, and the chip mounting unit installed at the circuit pattern unit112may be provided with a light emitting diode120as a light source of the backlight unit.

FIG. 6is a cross-sectional view illustrating a chassis assembly mounted with a heat-radiating PCB according to a fifth exemplary embodiment of the present invention. Referring toFIG. 6, the heat-radiating PCB110according to the fifth exemplary embodiment of the present invention may include a mounting unit116mounted with a chassis140at a bottom surface of a circuit pattern unit112formed with a circuit pattern. The mounting unit116is bent at a right angle from the circuit pattern unit112to be installed at a floor surface of the chassis140using TIM130.

An upper side-opened space150may be formed between the circuit pattern unit112and the lateral surface of the chassis140, and fixed at the bottom end of the chassis140using TIM130, and the chip mounting unit installed at the circuit pattern unit112may be provided with a light emitting diode120as a light source of the backlight unit.

While the present disclosure has been particularly shown and described with reference to exemplary embodiments thereof, the general inventive concept is not limited to the above-described embodiments. It will be understood by those of ordinary skill in the art that various changes and variations in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.

INDUSTRIAL APPLICABILITY

The heat-radiating PCB (printed circuit board) and a chassis assembly having the same according to the present invention have an industrial applicability in that the heat-radiating PCB and a bracket are integrated to prevent degraded heat transfer caused by use of TIM (thermal interface material) and to reduce generation of interface, whereby a thermal conduction degradation phenomenon caused by an air layer can be prevented to maximize the heat-radiating characteristics of the heat-radiating PCB.

Another industrial applicability is that the bracket is integrally manufactured with the heat-radiating PCB to simplify the structure and process by dispensing with separate bracket manufacturing process.

Still another industrial applicability is that the TIM is dispensed with between the heat-radiating PCB and the bracket to reduce use of the TIM and to dispense with the bracket, thereby reducing the manufacturing cost.

Still further industrial applicability is that generation of delamination caused by adhesion problem between the PCB and the bracket can be dispensed with.