Liquid Crystal Display Smart Window

A liquid crystal display smart window comprising:

• an inner glass sheet located in an indoor space;
• an outer glass sheet spaced apart from the inner glass sheet by a predetermined gap, the outer glass sheet configured to be exposed to an outside of a building;
• a transparent LCD device located in a space between the inner glass sheet and the outer glass sheet, the transparent LCD device configured to display an image;
• a window frame to support upper and lower surfaces and both side surfaces of each of the inner glass sheet and the outer glass sheet;
• and
• a light source secured to the window frame, the light source configured to emit light to at least one surface of the outer glass sheet,
• wherein the light source comprises a first light-emitting diode (LED) bar and a second LED bar, each of the first LED bar and the second LED bar configured such that a plurality of LEDs are mounted on a printed circuit board,
• the first LED bar and the second LED bar are respectively disposed on the upper and lower surfaces of the outer glass sheet, or on the both side surfaces of the outer glass sheet, and
• the outer glass sheet has an engraved pattern on one surface thereof facing the transparent LCD device and is configured to function as a light guide plate that radiates light introduced thereinto from the first LED bar and the second LED bar to the transparent LCD device.