Display device, display control method and electronic equipment

1. 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.

2. A display control method for a display device including 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 first or second detection means having a plurality of detection elements connected in parallel so as to be selectable, the display control method comprising the steps of: controlling the light intensity supplied to the display area according to a comparison result of the comparator; feeding a polarity signal adapted to select the polarity of the difference output and a reference value selection signal adapted to select a polarity of the given reference value to the comparator; setting first and second choices by the selection of a plurality of detection elements making up the first or 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; feeding the polarity signal and the reference value selection signal 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 selecting the plurality of detection elements making up the first or second detection means, 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.

3. The display control method of claim 2 , wherein if the comparison results of the comparator with the first and second choices are equal to each other, the plurality of detection elements making up the first or second detection means are selected so that an element size is closest to an average of first and second element sizes, the first element size determined by the selection of the plurality of detection elements making up the first or second detection means associated with the first choice, and the second element size determined by the selection thereof associated with the second choice, and the light intensity is controlled by the determined selection of the plurality of detection elements based on the comparison result of the difference output between the first and second detection means against the given reference value.

4. Electronic equipment having a display device in its enclosure, the 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.