Organic electroluminescence display device
An organic electroluminescence display device is provided having a display section including a plurality of pixels arranged in a matrix; and a detection section for detecting a luminance characteristic of an OLED element in each of the pixels. The detection section includes a first path for allowing a detected characteristic value to pass therethrough and a second path for attenuating the detected characteristic value. A first switch is provided for the first path whereas a second switch is provided for the second path, the second switch being opened when the first switch is closed. The detected characteristic value having passed through any one of the first path and the second path is input to a same analog-to-digital converter to be converted into a digital quantity.
1. An organic electroluminescence display device, comprising:
a display section including a plurality of pixels arranged in a matrix; and
a detection section for detecting, for each of the pixels, a temperature characteristic value of an OLED element in the pixel and a burn-in characteristic value of the OLED element in the pixel,
wherein the detection section includes first and second paths for the burn-in characteristic value and the temperature characteristic value respectively, the first path for allowing the burn-in characteristic value of the OLED element in each of the pixels to pass therethrough, the second path for attenuating the temperature characteristic value of the OLED element in each of the pixels and allowing the attenuated temperature characteristic value to pass therethrough,
a first switch is provided for the first path whereas a second switch is provided for the second path, the second switch being opened when the first switch is closed,
each of the temperature characteristic value and the burn-in characteristic value detected for the OLED element in the same pixel is, upon passing through the second path for the temperature characteristic value detected for the OLED element or passing through the first path for the burn-in characteristic value detected for the OLED element, input to a same analog-to-digital converter to be converted into a digital quantity, and
the second path limits a range of the temperature characteristic value to within a range of the analog-to-digital converter.
2. An organic electroluminescence display device according to claim 1 , wherein the temperature characteristic value is a voltage value at a terminal of the OLED element, the voltage value being generated by supplying a current from a current source provided in the detection section to the OLED element.
3. An organic electroluminescence display device according to claim 1 , wherein the second path includes a first resistor, and the attenuation of the temperature characteristic value is defined outside the second path by a ratio between a second resistor connected to the first resistor in series and the first resistor.
4. An organic electroluminescence display device according to claim 1 , wherein a buffer amplifier is provided between the analog-to-digital converter and any one of the first path and the second path.
5. An organic electroluminescence display device according to claim 1 , wherein each of the temperature characteristic value and the burn-in characteristic value is a voltage value at a terminal of the OLED element, the voltage value being generated by supplying a current from a current source provided in the detection section to the OLED element.
6. An organic electroluminescence display device according to claim 1 , wherein the temperature characteristic value is detected prior to the detection of the burn-in characteristic value, and a condition for the detection of the burn-in characteristic is determined by the temperature characteristic value digitalized by the analog-to-digital converter.
7. An organic electroluminescence display device according to claim 6 , wherein the burn-in characteristic is measured for a plurality of the pixels in a row direction in the pixels arranged in the matrix.
8. An organic electroluminescence display device according to claim 6 , wherein the burn-in characteristic is measured for a plurality of the pixels in a column direction in the pixels arranged in the matrix.
9. An organic electroluminescence display device according to claim 1 , wherein each of the temperature characteristic value and the burn-in characteristic value is a voltage value at a terminal of the OLED element, the voltage value being generated by supplying a current from a constant current source provided in the detection section to the OLED element, and a current value supplied from the constant current source for detecting the burn-in characteristic differs from that supplied from the constant current source for detecting the temperature characteristic.
10. An organic electroluminescence display device comprising:
a display section including a plurality of pixels arranged in a matrix; and
a detection section for detecting, in each of the pixels, a temperature characteristic value of an OLED element in the pixel and a burn-in characteristic value of the OLED element in the pixel,
wherein each of the temperature characteristic value and the burn-in characteristic value for each pixel is a voltage value at a terminal of the OLED element in the pixel, the voltage value of each value for each pixel being generated by supplying a current from a current source provided in the detection section to the OLED element,
a detection switch for controlling a flow of the current from the current source to the OLED element in each pixel is provided in the pixel,
the detection switch for each pixel being connected to the OLED element in the pixel;
the detection section includes first and second paths for the burn-in characteristic value and the temperature characteristic value respectively, the first path for allowing the burn-in characteristic value of the OLED element in each of the pixels to pass therethrough, the second path for attenuating the temperature characteristic value of the OLED element in each of the pixels and allowing the attenuated temperature characteristic value to pass therethrough,
a first switch is provided for the first path whereas a second switch is provided for the second path, the second switch being opened when the first switch is closed,
each of the temperature characteristic value and the burn-in characteristic value detected for the OLED element in the same pixel is, upon passing through the second path for the temperature characteristic value detected for the OLED element or passing through the first path for the burn-in characteristic value detected for the OLED element, input to a same analog-to-digital converter to be converted into a digital quantity, and
the second path limits a range of the temperature characteristic value to within a range of the analog-to-digital converter.