| 摘要 |
An image projection method and an apparatus including red, green, blue, and white color cathode ray tubes (CRTs). The projection apparatus includes a digital-analog converter receiving one or more digital image signals from an image source and converting the digital signals into analog signals; one or more cathode ray tubes receiving the analog signals and outputting optical beams having strengths corresponding to the signals; a screen, a point on which the optical beams are concentrated to form a pixel; and a convergence module receiving an image synchronization signal and a convergence control signal from the image source and providing the signals to the cathode ray tubes so that the optical beams can be concentrated on the point. The digital image signals include a white color image signal, and the cathode ray tubes include a white color cathode ray tube receiving the white color image signal and outputting a white color optical beam corresponding to the signal. Therefore, high brightness and clear contrast can be obtained even when a cathode ray tube with a small aperture is used.
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