| 摘要 |
PROBLEM TO BE SOLVED: To easily adjust white balance and to enhance the quality of a video by obtaining such constitution that the white balance can be adjusted without projecting a picture on a screen. SOLUTION: In a projection type display device using a digital micro-mirror device 3, light reflected in a first direction out of the light reflected from the micro-mirror device 3 is projected toward the screen 5 so as to display the picture and the light reflected in a second direction is received by a photosensor 16 so as to measure light information. Then, the level of a video signal is controlled by utilizing the measured light information so as to adjust the white balance. Thus, the light reflected on a part other than the screen 5 is measured and it can be utilized for adjusting the white balance. Besides, the white balance can be adjusted by making the screen 5 totally black.
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