Patent ID: 8648794
Filing Date: 2014-02-11
Classification: G01J,G02F,G09G

Abstract:
1. A screen light computation device comprising: a screen light detection sensor that is positioned to face, at a predetermined angle, a display screen of a monitor, which emits screen light linearly polarized in a first direction, the screen light detection sensor detecting the screen light; a reflected light detection sensor that has a light-receiving surface provided on a plane substantially same with a plane of a light-receiving surface of the screen light detection sensor, the reflected light detection sensor detecting ambient light reflected by the display screen of the monitor; a first polarizing filter that is provided on a front side of the reflected light detection sensor, the first polarizing filter having a polarizing direction perpendicular to the polarizing direction of the screen light which has been linearly-polarized; and a computation means for computing a value of the screen light included in a detection value by the screen light detection sensor on the basis of both the detection value by the reflected light detection sensor and the detection value by the screen light detection sensor.