US Patent No. 9,310,670

PROJECTOR AND DIMMING METHOD


Patent No. 9,310,670
Issue Date April 12, 2016
Title Projector And Dimming Method
Inventorship Michitaka Naitou, Tokyo (JP)
Assignee NEC Display Solutions, Ltd., Tokyo (JP)

Claim of US Patent No. 9,310,670

1. A projector comprising:
a light source that emits light;
a supply unit that supplies driving electric power to said light source;
a projection unit that modulates light that is emitted from said light source according to an image signal and projects said
modulated light onto a projection surface;

a detection unit that detects an intensity of ambient light; and
a control unit that, upon receiving a lighting signal that indicates that said light source is to be lit, controls said supply
unit according to the intensity of light that is detected by said detection unit to incrementally increase the driving electric
power that is supplied from said supply unit to said light source;

wherein said detection unit includes a temperature detection unit that detects an internal temperature in a vicinity of said
light source; and

said control unit, upon receiving said lighting signal, causes said supply unit to supply said driving electric power to said
light source when the internal temperature that was detected by said temperature detection unit surpasses a predetermined
temperature threshold value, and incrementally increases an amount of the driving electric power that is supplied to said
light source when the internal temperature that is detected by said temperature detection unit is lower than said predetermined
temperature threshold value.