Patent ID: 8072413

Claim:
A display device comprising: first detection means for detecting a light intensity around a display area; second detection means for detecting a dark current when light is shielded; and a comparator for comparing a difference output between the first and second detection means against a given reference value, the display device controlling the light intensity supplied to the display area according to a comparison result of the comparator, wherein the first detection means or the second detection means have a plurality of detection elements connected in parallel so as to be selectable, a polarity signal adapted to select a polarity of the difference output and a reference value selection signal adapted to select a polarity of the given reference value are fed to the comparator, first and second choices are set by the selection of the plurality of detection elements making up the first detection means or the second detection means, the first choice translating into a smaller amount of dark current in the second detection means than in the first detection means, the second choice translating into a larger amount of dark current in the second detection means than in the first detection means, the polarity signal and the reference value selection signal are fed to the comparator so that the polarities of the difference output and the given reference value fed to the comparator are opposite between the first and second choices, and the plurality of detection elements making up the first or second detection means are selected, based on the comparison results of the comparator in the two polarities set for the first and second choices, so that the amount of dark current is the same in the first and second detection means.