Light shutter array with a substantially even distribution trans

Details Light shutter array with a substantially even distribution trans Light shutter array with a substantially even distribution trans

1992-10-19

1995-09-12

Moskowitz, Nelson

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359 87, 359323, 21912168, 21912169, B41J 321, G02F 103, G03G 1504

Patent

active

054502306

ABSTRACT:
The present invention relates to a light shutter array which has shutter elements made of an electro-optical material. The quantity of light transmitted by each shutter element in the array is measured, and a limit is set relative to the smallest measured value such that the transmitted light quantity distribution of the light shutter array would be regarded substantially even if all shutter elements transmitted light within the limit. To achieve such a substantially even distribution, shutter elements which transmit light over the limit are subjected to trimming. Since trimmed regions on a shutter element do not transmit light, the quantity of light transmitted through a trimmed shutter element is lowered in proportion to the area of the trimmed region. Alternatively, individual electrodes and/or portions of a common electrode corresponding to the shutter elements which transmit light over the limit are trimmed. As a result, electric fields generated in the shutter elements are weakened, and the polarizing effects of the shutter elements are weakened. Consequently, the quantity of light transmitted through those shutter elements is lowered.

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