| 摘要 |
PCT No. PCT/GB91/00551 Sec. 371 Date Nov. 12, 1992 Sec. 102(e) Date Nov. 12, 1992 PCT Filed Apr. 9, 1991 PCT Pub. No. WO91/15923 PCT Pub. Date Oct. 17, 1991.A projection system of the kind in which beams of light are projected by a projector onto a screen and the beams are modulated by electronic video information is characterized in that means are provided to vary the intensity of the light falling on different parts of the screen so that to an observer viewing the screen the said light intensity will be perceived as being substantially uniform over substantially the whole are of the screen.
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