auto-darkening welding

LCD is used in the light diversification welding helmet. When the electron controller

receive the welding arc, LCD will turn light state into dark state in the short time to
 protect welders¡¯ eyes, and avoid repeated action of tilting up the welding lens.  light diversification welding helmet is made up by three parts: shell, window,
  headgear.
      Shell is the main part to protect welder¡¯ face from light pollution and welding splash,
  and it was charged with the setting and fixing of window part.