| 摘要 |
A projector including a projector to superpose pictures on a screen, the pictures being displayed on cathode ray tubes corresponding to different colors. Reference signals are inputted to the corresponding cathode ray tubes for a predetermined period of time after application of power so that one of both a picture with a uniform brightness and a picture with a uniform color is formed all over the screen in response to the reference signals. The projector effectively reduces the fluctuation in registration of the displayed pictures.
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