Display device, display control method, and electronic apparatus
View Patent ↗A display device is provided including a photosensor PS that detects the ambient light amount of a display area, a comparator that compares the output of the photosensor PS with a predetermined reference value, and a backlight controller that controls the amount of light supplied to the display area depending on a comparison result by the comparator, a switch SW for controlling application of a precharge potential is connected to a metal that exists near the light-receiving part of the photosensor PS with the intermediary of an insulating film. The embodiment apparently decreases the parasitic capacitance of the detection element to thereby suppress the influence of the parasitic capacitance of the detection element itself at the time of light amount detection.
1. A display device comprising:
a detection element that detects an amount of ambient light of a display area;
a comparator that compares an output of the detection element with a first predetermined reference value; and
a controller configured to control an amount of light supplied to the display area depending on a comparison result by the comparator, wherein
a switch connected to a first metal that exists near a light-receiving part of the detection element outside the display area with an intermediary of an insulating film, the switch controlling an application of a precharge potential to the metal to form a parasitic capacitance between the first metal and the light-receiving part of the detection element, and to render a potential of the first metal a floating state; and
a dark current detection element including a black color filter and configured to detect a dark current; and
a second switch connected to a second metal that exists near the dark current detection element,
wherein the comparator compares an output of the dark current detection element with a second predetermined reference value.
2. A display control method comprising:
detecting an amount of ambient light of a display area by detection means and controlling an amount of light supplied to the display area based on a result of comparison between a detection value and a first predetermined reference value; and
controlling an application of a precharge potential to a first metal to form a parasitic capacitance between the first metal and a light-receiving part of the detection means outside the display area, and to render a potential of the first metal a floating state,
wherein the first metal exists near the light-receiving part of the detection element with an intermediary of an insulating film, wherein a dark current detection element includes a black color filter and is configured to detect a dark current, wherein a second switch is connected to a second metal that exists near the dark current detection element, and wherein a comparator is configured to compare an output of the dark current detection element with a second predetermined reference value.
3. An electronic apparatus comprising a display device provided in a case, the display device including:
a detection element that detects an amount of ambient light of a display area;
a comparator that compares an output of the detection element with a first predetermined reference value; and
a controller configured to control an amount of light supplied to the display area depending on a comparison result by the comparator, wherein
a switch connected to a first metal that exists near a light-receiving part of the detection element outside the display area with an intermediary of an insulating film, the switch controlling an application of a precharge potential to the first metal to form a parasitic capacitance between the first metal and the light-receiving part of the detection element, and to render a potential of the first metal a floating state; and
a dark current detection element including a black color filter and configured to detect a dark current; and
a second switch connected to a second metal that exists near the dark current detection element,
wherein the comparator compares an output of the dark current detection element with a second predetermined reference value.
4. A display device according to claim 1 , wherein
before a start of light amount detection by the detection element, the switch is closed and applies the precharge potential to the metal to form the parasitic capacitance between the metal and the light-receiving part of the detection element, and
at the start of light amount detection by the detection element, the switch is open rendering the potential of the metal the floating state.
5. A display device according to claim 1 , wherein a reset operation is carried out in a vertical blanking period of video displaying on the display area.
6. A display device according to claim 1 , wherein the switch is electrically connected to the controller.