PROJECTION VIDEO DISPLAY DEVICE

• US 20100302463A1
• Filed: 05/27/2009
• Published: 12/02/2010
• Est. Priority Date: 05/27/2009
• Status: Abandoned Application

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Matsumoto, Shinya
• Application Number:
  US12/472,475
• Publication Number:
  US 20100302463A1
• Time in Patent Office: Days
• US Class Current: 348/744
• CPC Class Codes: G03B 21/16 Cooling; Preventing overheating
• CPC Class Codes: H04N 9/3144 Cooling systems cooling of liquid crystal cells in general G02F1/133382; cooling of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/16
• CPC Class Codes: H04N 9/3161 using laser light sources using laser beams scanning the display screen H04N9/3129

Abstract

A projection video display device 100 includes: a first housing 101 that houses a laser light source 1 and an optical modulation unit 2 that modulates laser light and generates video image light; a second housing 102 that houses a refrigerant circuit 4 to which a compressor, a heat radiator, an expansion valve, and a heat absorber are connected via a refrigerant piping; and air blower portions F2, F3 that send out air in the first housing 101 into the second housing 102 to perform heat exchange with the heat absorber and send out the air that undergoes the heat exchange with the heat absorber into the first housing 101.

Claims

1. A projection video display device comprising:

a projection video generation portion that has a laser light source and an optical modulation unit that modulates light from the laser light source and generates video image light;

a first housing that houses the projection video generation portion; and

an air conditioning portion that has a dehumidification function to dehumidify air in the first housing.

2. The projection video display device according to claim 1, further comprising a second housing that houses the air conditioning portion, wherein the second housing is disposed below the first housing.

3. The projection video display device according to claim 1, wherein the air conditioning portion has a cooling function to cool the air in the first housing.

4. The projection video display device according to claim 1, further comprising a cooling portion that liquid-cools the projection video generation portion.

5. A projection video display device comprising:

a projection video generation portion that has a laser light source and an optical modulation unit that modulates light from the laser light source and generates video image light;

a first housing that houses the projection video generation portion;

a refrigerant circuit to which a compressor, a heat radiator, an expansion valve, and a heat absorber are connected via a refrigerant piping;

a second housing that houses the refrigerant circuit; and

an air blower portion that sends out air in the first housing into the second housing to perform heat exchange with the heat absorber and sends out the air that undergoes the heat exchange with the heat absorber into the first housing.

6. A method for starting a projection video display device that comprising:

a projection video generation portion that has a laser light source and an optical modulation unit that modulates light from the laser light source and generates video image light; and

a first housing that houses the projection video generation portion, wherein the projection video display device, further comprising;

a first detection portion that detects temperature or humidity in the first housing; and

an air conditioning portion that has a function to dehumidify air in the first housing, and wherein

starts of the air conditioning portion and the projection video generation portion are controlled based on detection result from the first detection portion.

7. The method for starting the projection video display device according to claim 6, comprising:

a dehumidification step of operating the dehumidification function of the air conditioning portion for operation time that is set based on detection result detected by the first detection portion; and

a projection step of starting the projection video generation portion after the dehumidification step is completed.

8. The method for starting the projection video display device according to claim 7, wherein the projection video display device further comprising:

a second detection portion that detects temperature of the laser light source; and

a cooling portion that liquid-cools the projection video generation portion, wherein the method further comprising a cooling step of starting the cooling portion if the temperature detected by the second detection portion is equal to or lower than a first preset threshold temperature.