Projection display device comprising a light source
AssigneeNEC Display Solutions, Ltd.
InventorsShunsuke Okazawa, Takayuki Okada
Life of this patent
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Abstract
A projection display device projects light modulated based on a video signal. The projection display device includes a light source, a first fan for cooling the light source, and a second fan different from the first fan. The number of revolutions of the first fan is increased or decreased with the increase or decrease of the output of the light source. The number of revolutions of the second fan is decreased when the number of revolutions of the first fan is increased, and increased when the number of revolutions of the first fan is decreased.
Claims16
A projection display device that projects light modulated based on a video signal, comprising:
- a light source;
- a first fan for cooling the light source;
- a second fan different from the first fan;
- and
- a third fan different from the first fan and the second fan, wherein:
- a number of revolutions of the first fan is increased or decreased with an increase or decrease of an output of the light source;
- a number of revolutions of the third fan is decreased when the number of revolutions of the first fan is increased, and increased when the number of revolutions of the first fan is decreased;
- and
- a number of revolutions of the second fan is always maintained constant.
A projection display device that projects light modulated based on a video signal, comprising:
- a light source;
- a first fan for cooling the light source;
- a second fan different from the first fan;
- and
- a third fan different from the first fan and the second fan, wherein:
- a number of revolutions of the first fan is increased or decreased with an increase or decrease of an output of the light source;
- and
- a number of revolutions of the second fan and a number of revolutions of the third fan are decreased when the number of revolutions of the first fan is increased, and increased when the number of revolutions of the first fan is decreased.
Dependencies are inferred from the claim text.