| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection type display device which can change the quantity of light illuminating an optical modulation means without changing light itself emitted from a lamp and has an excellent effect in respects of power of video expression and adaptability to environments for use and to provide its driving method. SOLUTION: With respect to the projection type display device, a dimming means 30 comprises a color separation means 21 for separating emitted light from a light source 2 into a plurality of color light having different colors, light quantity control means 23, 24, and 25 for controlling the transmission quantities of respective color light emitted from the color separation means 21, and a color synthesizing means 22 for synthesizing respective color light emitted from the light quantity control means 23, 24, and 25, and the light quantity control means 23, 24, and 25 are controlled in time division by color light on the basis of information from the outside to be able to control the illuminance and/or the color of light illuminating an optical modulation means 20.
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