Reflective light valve modulator
First Claim
1. A light valve modulator of reflective operation which includes a multi-layer structure which is controlled electrostatically, comprising a transparent substrate (13) supporting a first transparent deformable layer (10) and a second insulating dielectric deformable layer (11), with a mirror layer (12) sandwiched between, and a third, dielectric insulating layer (14) on the outside of the second layer (11), at least one of the layers between the second layer (11) and the substrate (13) being electrically conductive, so that when the third dielectric layer (14) receives an electric charge pattern (15) by means of one or more electron beams (16), the mirror layer (12) is locally deformed by electrostatic forces occurring between the charge pattern (15) and the conductive layer.
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Abstract
A light valve modulator of reflective operation which includes a multi-layer structure which is controlled electrostatically, comprises a transparent substrate supporting a first transparent deformable layer and a second insulating dielectric deformable layer, with a mirror layer sandwiched between, and a third, dielectric insulating layer on the outside of the second layer, at least one of the layers between the second layer and the substrate being electrically conductive, and the third dielectric layer being capable of receiving an electric charge pattern by means of one or more electron beams, whereby the mirror layer is locally deformed by electrostatic forces occurring between the third layer and the conductive layer.
The twin deformably layers allow good sensitivity, while the outside dielectric layer which receives charge from an electron beam protects the deformable layers from electron bombardment and the cathode from outgassing.
The modulator is for use in display tubes, particularly for projection TV.
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Citations
25 Claims
- 1. A light valve modulator of reflective operation which includes a multi-layer structure which is controlled electrostatically, comprising a transparent substrate (13) supporting a first transparent deformable layer (10) and a second insulating dielectric deformable layer (11), with a mirror layer (12) sandwiched between, and a third, dielectric insulating layer (14) on the outside of the second layer (11), at least one of the layers between the second layer (11) and the substrate (13) being electrically conductive, so that when the third dielectric layer (14) receives an electric charge pattern (15) by means of one or more electron beams (16), the mirror layer (12) is locally deformed by electrostatic forces occurring between the charge pattern (15) and the conductive layer.
Specification