What Is a Light Valve?

The liquid crystal light valve realizes the phase retardation of light by controlling the refractive index of liquid crystal molecules by voltage. A liquid crystal material is filled between the two sheets of flat glass, and a transparent electrode and a calibration layer are plated on the glass sheet. The gaps between the glass plates are controlled by glass fibers with fine edges. This creates a liquid crystal phase retarder.

LCD light valve

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The liquid crystal light valve realizes the phase retardation of light by controlling the refractive index of liquid crystal molecules by voltage. A liquid crystal material is filled between the two sheets of flat glass, and a transparent electrode and a calibration layer are plated on the glass sheet. The gaps between the glass plates are controlled by glass fibers with fine edges. This creates a liquid crystal phase retarder.

Chinese name

LCD light valve

Foreign name

LC optical shutter

Nature

Optical switch

Features

Quick switch response and high extinction ratio

Put an end to

Eliminate the occurrence of electrooptic ophthalmia

When the voltage on both sides of the liquid crystal is zero and the alignment direction of the liquid crystal molecules is parallel to the direction of the glass plate, the difference between the refractive index of o light and the refractive index of e light is the largest. As the voltage across the liquid crystal layer increases, the liquid crystal molecules begin to rotate, and the difference between the o-refractive index (no) and e-refractive index (ne) gradually decreases until the two are almost equal.

If the polarization direction of incident light is consistent with the refractive index (no) of the liquid crystal O light, the phase delay caused by the liquid crystal is independent of the applied voltage. This is because the O-refractive index (no) of the liquid crystal does not change with voltage. If the polarization direction of the incident light is the same as the refractive index (ne) of the liquid crystal e light, the phase delay caused by the liquid crystal will change with the voltage change.

Liquid crystal light valve is a liquid crystal TN product used in welding masks. It can double filter, avoid the harmful ultraviolet and infrared radiation generated by the arc, and the damage to the eyes caused by welding light, and prevent the occurrence of electro-optic ophthalmitis.

Main application areas: 3D display, camera shutter, laser applications, biomedicine, welding masks, automation equipment, microscopes, etc.