Patent ID: 7345669

Claim:
A moving photometric device having a shape which covers a part of a front surface of a liquid crystal display device, and does not cover a front surface of a liquid crystal display screen other than during photometry, comprising: a liquid crystal display portion; a bezel surrounding all four sides of said liquid crystal display; a shaft portion provided at a corner portion of said bezel; a moving portion whose end portion is connected to said shaft portion and rotatably attached with a focus on said shaft portion to be placed in said bezel; a sensor portion provided in said liquid crystal display portion at the other end portion of the moving portion; a CPU to which a detection signal from the sensor portion is supplied; a Look Up Table in which the detection signal passing through said liquid crystal display portion and being detected in said sensor portion is normalized with a predetermined maximum intensity required for said liquid crystal display device, compared with a predetermined staircase signal for calibration, and operated for numeric representation, and a proper luminance quantity; a liquid crystal drive circuit portion to which said Look Up Table is supplied from said CPU to cause changes in a transmission state of the liquid crystal display device; and a backlight drive circuit portion driving backlight of the liquid crystal display device with said proper luminance quantity.