| 摘要 |
The additive color system includes a light source providing three component light beams. The component beams are combined to form a composite beam. Three variable-density electrooptical filter units are provided, each arranged in the path of a respective one of the component beams. Each filter unit attenuates the respective component beam in dependence upon a control voltage applied to its control electrodes. A selecting device selects the transmission value to which the filter units are to be set. A circuit generates corresponding control voltages and applies them to the control electrodes of the filter units, and includes compensating circuits for compensating for repeatability errors in the response of the filter units.
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