Patent ID: 7753567

Claim:
A backlight unit for a test device of an LCD panel comprising: a chamber having four side walls and a predetermined space therein; a plurality of through holes formed in each of the sidewalls around the perimeter of the chamber to communicate between a space inside chamber space and a space exterior to the chamber; a backlight provided in the chamber to emit a light to an LCD panel positioned in the chamber; a plurality of circulating fans provided through each of the sidewalls such that a circulating fan is located in each of the through holes in the chamber sidewalls to circulate air through the chamber a refrigerant pipe provided inside the chamber to flow a low temperature refrigerant therein; and a heat-radiating member provided inside the chamber to radiate heat transmitted from the backlight, wherein the heat-radiating member is provided along a rear surface of the backlight in a lower space inside the chamber, wherein the heat-radiating member has one surface contacting the backlight to transmit heat thereto, and another surface being a heat sink on which a plurality of radiating fins are formed, wherein the refrigerant pipe is provided along the lower space inside the chamber in a multi-stage bent shape to conduct heat away from the space inside the chamber, wherein the refrigerant pipe is provided to pass through the respective radiating fins to exchange heat between refrigerant within the refrigerant pipe and air inside the chamber through the respective radiating fins, wherein the refrigerant pipe is apart from the one surface of the heat-radiating member.