Patent ID: 8089424

Claim:
A functional display type anti-blinding device comprising: an optical detecting unit to detect light emitted from a welding or cutting torch; an electromagnetic wave sensing unit to sense electromagnetic waves emitted from the welding or cutting torch; an electromagnetic wave detecting unit to compare a resonated signal received from the electromagnetic wave sensing unit with a variably set reference value; a control unit to apply an electromagnetic wave detecting unit start-up signal to the electromagnetic wave detecting unit and to monitor a variation in an electromagnetic wave signal received from an output of the electromagnetic wave detecting unit, when optical detection is started by the optical detecting unit; a light transmission control unit to control a variation in light transmittance of an anti-blinding plate based on an output signal of the control unit; and a display control unit to control a screen display condition of the anti-blinding plate based on an output signal of the control unit, wherein the anti-blinding plate includes: a filter to selectively filter a predetermined wavelength of light; a polarizer to polarize the filtered light having passed through the filter; a shutter Liquid Crystal Display (LCD) arranged at a rear side of the polarizer, a light transmittance of which is varied based on the control of the light transmission control unit; a transparent dot-matrix LCD arranged at a rear side of the shutter LCD and serving to indicate the screen display condition based on the control of the display control unit; and a glass protector arranged at a rear side of the transparent dot-matrix LCD.