For this, light valves are used that vary the amount of light reaching the target by blocking its passage in some way.

This uses one, two, or three microfabricated light valves called digital micromirror devices (DMDs).

This allows them to act as light valves - different amounts of current allow different amounts of light to pass through the crystal.

When the light passes back through the liquid crystals, the crystals act as light valves to create the light and dark areas of the picture.

There are a few other lesser-known TV technologies, like grating light valves.

Using the film instead of pure liquids should make it easier and cheaper to turn large glass panels into light valves, Mr. Saxe said.

The system's exposure mechanism sends digital signals to three light valves - red, blue and green - that converge into a single intense beam of light.

Improvements included new cylinder heads, forged pistons, and lighter valves.

A light valve (LV) is a device for varying the quantity of light, from a source, which reaches a target.

"Our windows act like light valves," Mr. Harary said.