| 摘要 |
A display device is provided with a first photosensor (PS1) for detecting the quantity of external light of a display area; a second photosensor (PS2) for detecting a dark current when light is blocked; changeover switches (SW1, SW2) for selecting the first photosensor (PS1) or the second photosensor (PS2); a comparator (102) for comparing an output from the selected first photosensor (PS1) or the selected photosensor (PS2) with a prescribed reference value; and a control means, which calculates a difference between the results obtained from the comparator (102) through comparison with the first photosensor (PS1) and a comparison results obtained from the comparator (102) through comparison with the second photosensor (PS2), and controls the quantity of light to be applied to a display region corresponding to the operation results. The quantity of light to be applied to the display region is correctly adjusted by suppressing influence of a detection error due to variance in performance of the photosensors applied to the display device. |
