| 摘要 |
<p>An illumination system for an image projection apparatus utilizing a single light valve (62) for modulating light impinging thereon with an image signal (66) which system comprises three projection lamps (82, 84, 88), one for each of the primary colors, which are activated sequentially. Positioned in the light path between two of the lamps (84, 88) and the light valve are occluders (94, 96) which block and unblock the light output from their associated lamp. The lamps which have the occluders are operated such that each lamp may be driven with a series of non-occluded pulses and occluded pulses. The more a desired reduction in light output in one of the colors is required, the non-occluded pulses are reduced and the corresponding occluded pulses are increased. This permits adjustment of the colorimetry of the system without adversely affecting the electrical properties of the lamp.</p> |
