Light-emitting device, method for driving the same, and electronic apparatus
View Patent ↗A light-emitting device includes a plurality of pixels, a temperature-detection pixel, a temperature detector, an applied-current calculator, and a current applying unit disposed on a substrate. The pixels include display light-emitting elements for displaying information. The temperature-detection pixel is provided within a display area where the pixels are disposed and includes a temperature-detection light-emitting element for temperature detection, which is shielded by a light shielding layer and includes the same organic layer as that included in each display light-emitting element. The temperature detector detects a current value of the temperature-detection light-emitting element so as to detect the temperature thereof. The applied-current calculator calculates an electric current to be applied to the display light-emitting elements in accordance with the detected temperature so that the display light-emitting elements emit light with a predetermined luminance. The current applying unit applies the electric current to the display light-emitting elements.
1. A light-emitting device comprising:
a substrate that has a display area and a peripheral area positioned outside of the display area;
a plurality of displaying pixels, disposed in the display area, and a plurality of temperature-detection pixels, disposed in the peripheral area and a center area of the display area, each pixel comprising a first electrode, a second electrode, and including an organic electroluminescent layer which includes organic material and is disposed between the first electrode and the second electrode, wherein the plurality of displaying pixels display information and the plurality of temperature-detection pixels further comprise a light shielding layer that is directly disposed between the first electrode and the organic electroluminescent layer to prevent the temperature-detection pixels to display information;
a temperature detector that is disposed on the substrate in the peripheral area and detects a current value of the temperature-detection pixels so as to detect the temperature of each respective temperature-detection pixel, the temperature detector being coupled with the temperature-detection pixels;
an applied-current calculator that is disposed above the substrate in the peripheral area and calculates an electric current to be applied to the display light-emitting element in accordance with the temperature detected by the temperature detector so that the display light-emitting element emits a light with a predetermined luminance; and
a current applying unit that is disposed above the substrate in the peripheral area and applies the electric current to the display light-emitting element.
2. The light-emitting device according to claim 1 , wherein the display light-emitting element include three kinds of display light-emitting elements respectively having three kinds of first organic electroluminescent layers that emit red, green, and blue light rays,
wherein the temperature-detection pixels include three kinds of temperature-detection pixels respectively having three kinds of second organic electroluminescent layers that are the same as the three kinds of first-organic electroluminescent layers included in the three kinds of display light-emitting elements,
wherein the temperature detector detects the temperature of each of the three kinds of temperature-detection pixels, and
wherein the applied-current calculator calculates the electric current to be applied to each of the three kinds of display light-emitting elements.
3. The light-emitting device according to claim 1 , wherein the temperature-detection pixels contain an organic material having a temperature characteristic of 5 mV/° C. or higher.
4. The light-emitting device according to claim 1 , wherein the temperature detector detects the current value of the temperature-detection pixels by applying a predetermined voltage thereto.
5. An electronic apparatus comprising the light-emitting device according to claim 1 .
6. The light-emitting device according to claim 1 , the temperature-detection pixels only being arranged at a plurality of predetermined locations at the center region and the peripheral area of the display area.
7. The light-emitting device according to claim 6 , the temperature-detection pixels only being arranged at the center region and each corner of the peripheral area of the display area.
8. A method for driving a light-emitting device that includes a substrate that has a display area and a peripheral area positioned outside of the display area;
a plurality of displaying pixels, disposed in the display area, and a plurality of temperature-detection pixels, disposed in the peripheral area and a center area of the display area, each pixel comprising a first electrode, a second electrode, and including an organic electroluminescent layer which includes organic material and is disposed between the first electrode and the second electrode, wherein the plurality of displaying pixels display information and the plurality of temperature-detection pixels further comprise a light shielding layer that is directly disposed between the first electrode and the organic electroluminescent layer to prevent the temperature-detection pixels to display information; the method comprising:
respectively detecting a current value of each of the temperature-detection pixels so as to detect the temperature of each respective the temperature-detection pixel;
calculating an electric current to be applied to the display light-emitting element in accordance with the detected temperature so that the display light-emitting element emits light with a predetermined luminance; and
applying the electric current to the display light-emitting element.