Patent ID: 8054412

Claim:
A liquid crystal display device comprising: a light source portion comprising a red LD light source that emits red laser light, a blue LD light source that emits blue laser light, a green SHG-LD light source that emits infrared laser light, and a laser light source drive circuit portion that drives the red LD light source, the blue LD light source and the green SHG-LD light source; a liquid crystal display panel portion including a liquid crystal display panel that displays an image thereon by applying a voltage to liquid crystals, and a fiber that guides the red laser light, the blue laser light, and the infrared laser light, emitted from the red LD light source, the blue LD light source and the green SHG-LD light source of the light source portion, to the liquid crystal display panel portion, wherein: the fiber is formed in such a manner that the light source portion and the liquid crystal display panel portion are disposed to be spatially separated, the liquid crystal display panel portion includes an SHG element that converts a portion of the infrared laser light guided by the fiber to green laser light, includes a dichroic mirror that separates a remaining portion of the infrared laser light not converted to the green laser light by the SHG element, and includes a photoelectric conversion element that converts into power the remaining portion of the infrared laser light separated by the dichroic mirror, the liquid crystal display panel portion is driven by the power, and the laser light source drive circuit portion determines a light intensity of the infrared laser light emitted from the green SHG-LD light source, based on a required drive power of the liquid crystal display panel portion and based on a required output intensity of the green laser light.