| 摘要 |
<p>In a screen light computation device, a first polarizing filter (93) blocks P waves reflected by a reflecting screen, and screen light; a reflected light sensor (95) receives S waves; a second polarizing filter (83) allows the screen light to pass while blocking the S waves; and a screen light sensor (85), being set at Brewster's angle, where the P waves are not received, still receives some escaping P waves. A screen light extraction computation look-up table (LUT; not shown) stores a correlation between the value detected by the reflected light sensor (95) and the value detected by the screen light sensor (85). The LUT is queried, a value of only the screen light that does not include the reflected light is computed, and the screen light that does not include reflected peripheral light (reflected light) without turning off a backlight of a monitor is detected in a display screen of the monitor.</p> |
