US Patent No. 9,250,503

IMAGE DISPLAY DEVICE AND LIGHT SOURCE COOLING METHOD


Patent No. 9,250,503
Issue Date February 02, 2016 
Title Image Display Device And Light Source Cooling Method
Inventorship Tadashi Tani, Tokyo (JP)
Yukinori Shioya, Tokyo (JP)
Jiro Takami, Tokyo (JP)
Assignee NEC DISPLAY SOLUTIONS, LTD., Tokyo (JP)

Claim of US Patent No. 9,250,503

7. An image display device that has a light source and that displays an image in which light emitted from the light source
has been spatially modulated, comprising:
a power supply section that supplies power to said light source;
a first cooling fan that cools said light source;
an input section that accepts an input signal that designates either a first lighting mode in which a power value supplied
to said light source is a first setting value or a second lighting mode in which the power value supplied to said light source
is a second setting value that is smaller than said first setting value and outputs a designation signal that represents the
designated mode;

a projection section that projects image light in which light emitted from the light source has been spatially modulated;
a shutter located opposite to a plane from which the image light of said projection section exits; and
a control section that controls an operation of said first cooling fan and controls said power supply section to supply power
to said light source,

wherein if said control section accepts said designation signal that denotes that said first lighting mode has been designated
from said input section, said control section causes said power supply section to supply power corresponding to said first
setting value to said light source and said first cooling fan to operate,

wherein if said control section accepts said designation signal that denotes that said second lighting mode has been designated
from said input section, said control section causes said power supply section to supply power corresponding to said second
setting value to said light source and causes said first cooling fan to stop, and

wherein said control section monitors whether said shutter is open or closed and if said control section detects that said
shutter is closed, said control section causes said power supply section to supply power corresponding to said second setting
value to said light source and causes said cooling fan to stop.