| 摘要 |
The input data samples for a fringe field responsive electro-optic line printer are differentially encoded and the polarity of the differentially encoded data is periodically reversed, thereby reducing the number of electrodes such a printer requires to achieve a given resolution by a factor of just less than two and protecting the electro-optic element of such a printer against optical damage. The sample-to-sample voltage drops of the differentially encoded data correspond to the magnitudes of the input samples and, therefore, the fringe fields produced within the electro-optic element of the light valve for such a line printer when the encoded samples are applied to the electrodes of the light valve cause the light beam that is transmitted through the electro-optic element to be spatially modulated in accordance with the input samples. Trapped carriers are inhibited from accumulating in the electro-optic element because the nominal polarity of the fringe fields reverses in response to the changes in the polarity of the differentially encoded data.
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