Liquid crystal light valve for electric welding goggles

Abstract

A liquid crystal light valve for a pair of electric welding goggles is composed of a plurality of overlapping liquid crystal displays. When each liquid crystal display is manufactured, the inner sides of two parallel ITO glass substrates are filled with liquid crystal materials, and polaroids are attached to the outer sides of the ITO glass substrates. The product of the refractive index anisotropy deltaN of the liquid crystal materials and the thickness D of a box of the liquid crystal displays is smaller than or equal to 0.35 micrometer, and the torque angle of the liquid crystal displays is designed within the range of 80 degrees to 87 degrees. By optimizing and selecting structures and materials of the liquid crystal displays, the view angle is expanded, diffusion is reduced, uniformity of the product is improved, four indexes all reach the first level, and the application range of the product is greatly enlarged.

Description

technical field [0001] The invention relates to a liquid crystal light valve suitable for electric welding goggles, belonging to the field of optical technology. Background technique [0002] Welding goggles belong to human eye protection equipment. There are four basic optical indicators: uniformity of brightness, diffusion, uniformity of blackness and angle dependence. Each optical indicator is divided into four grades: 1st, 2nd , Grade 3 and unqualified. At present, when using liquid crystal light valves to manufacture welding goggles, liquid crystal light valves can have various structures, such as TN type liquid crystal display (twisted nematic phase, twist angle 90 degrees), HTN type liquid crystal display (highly twisted nematic phase, twisted angle 110°, 180°), STN liquid crystal display (super-twisted nematic phase, twist angle 220°, 270°), etc., but the four basic optical indicators of the existing liquid crystal light valve type welding goggles generally cannot r...

AI Technical Summary

Problems solved by technology

At present, when using liquid crystal light valves to manufacture welding goggles, liquid crystal light valves can have various structures, such as TN type liquid crystal display (twisted nematic phase, twist angle 90 degrees), HTN type liquid crystal display (highly twisted nematic phase, twisted angle 110°, 180°), STN liquid crystal display (super-twisted nematic phase, twist angle 220°, 270°), etc., but the four basic optical indicators of the existing liquid crystal light valve type welding goggles generally cannot reach one at the same time. class

If the index of angle dependence is achieved at the first level, it is necessary to use an EWV compensation film to widen the viewing angle, and this EWV film has a divergent effect on light, so that the diffusion index cannot meet the requirements of the first level.

This is a kind of practice that loses sight of the other, and it will make the indicators unable to achieve a better and more consistent level at the same time, thus greatly limiting the application range of liquid crystal light valve type welding goggles

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