Granted Patent B2

US 8,368,837 · App. 12/883,365 · Granted Feb 5, 2013

Abstract

Claims (19)

1. A liquid crystal display device comprising:

a liquid crystal display panel; and

a backlight disposed to face the liquid crystal display panel,

the backlight including at least a frame having a bottom surface facing the liquid crystal display panel, a reflector placed on the bottom surface of the frame, and a plurality of light sources disposed on the liquid crystal display panel side of the reflector, wherein

a recess of the frame protruding in the opposite direction to the liquid crystal display panel is formed in the bottom surface of the frame, the recess of the frame and the reflector constituting an air duct.

2. The liquid crystal display device according to claim 1 , wherein the air duct has an air intake hole formed at one end and an air exhaust hole formed at the other end.

3. The liquid crystal display device according to claim 2 , further comprising forced ventilation means mounted on a surface of the frame on the opposite side from the liquid crystal display panel so as to cover any one ventilation hole of an air intake hole and an air exhaust hole.

4. The liquid crystal display device according to claim 3 , wherein the forced ventilation means is configured to include a rotary fan.

5. The liquid crystal display device according to claim 1 , wherein the light sources include cathode fluorescent lamps.

6. The liquid crystal display device according to claim 1 , wherein the plurality of light sources include rod-like light sources and are arranged in parallel in a second direction crossing a first direction as the longitudinal direction of the rod-like light source, and

a plurality of the air ducts are formed, the air ducts each having a portion extending along the first direction and being arranged in parallel in the second direction.

7. The liquid crystal display device according to claim 6 , wherein among the plurality of air ducts, at least an air duct disposed on one side and an air duct disposed on the other side are different in width.

8. The liquid crystal display device according to claim 7 , wherein among the plurality of air ducts, an air duct formed closest to an edge side of the bottom surface of the frame is larger in width than the other air ducts.

9. The liquid crystal display device according to claim 6 , wherein one end of each of the plurality of air ducts reaches a common ventilation hole formed in the frame.

10. The liquid crystal display device according to claim 9 , wherein at least some of the plurality of air ducts have a plurality of ventilation holes formed in the frame on the way to the common ventilation hole.

11. The liquid crystal display device according to claim 9 , further comprising forced ventilation means mounted on a surface of the frame on the opposite side from the liquid crystal display panel so as to cover the common ventilation hole.

12. The liquid crystal display device according to claim 11 , wherein the forced ventilation means is configured to include a rotary fan.

13. The liquid crystal display device according to claim 6 , wherein the light sources include cathode fluorescent lamps.

14. The liquid crystal display device according to claim 1 , wherein the recess of the frame constituting part of the air duct, includes the bottom surface of the frame facing the liquid crystal display panel forming a bottom and sides of the recess, the bottom and sides of the recess formed by the bottom surface of the frame and the reflector constituting the air duct.

Assignments (8)