Method of manufacturing an organic light emitting display
View Patent ↗A pixel includes an organic light emitting diode, a first transistor having a source coupled to a first power source, a control gate coupled to a first node, and a drain coupled to a second node, wherein the first transistor includes a floating gate and an insulating layer between the floating gate and the control gate, a second transistor having a source coupled to a data line, a drain coupled to the first node, and a gate coupled to a scan line, a third transistor having a source coupled to the second node, a drain coupled to the organic light emitting diode, and a gate coupled to one of a light emitting control line and the scan line, and a capacitor coupled between the first power source and the first node.
1. A method of manufacturing an organic light emitting display, comprising:
determining a current flowing into a first transistor of a pixel;
determining a deviation of a threshold voltage of the first transistor using the determined current; and
compensating for the deviation of the threshold voltage, wherein:
the first transistor is a floating gate transistor, and
compensating for the deviation of the threshold voltage includes storing a voltage corresponding to the deviation of the threshold voltage in the first transistor.
2. The method as claimed in claim 1 , wherein storing the voltage corresponding to the deviation of the threshold voltage includes controlling an amount of electrons stored in a floating gate of the floating gate transistor.
3. The method as claimed in claim 2 , further comprising extracting electrons stored in the floating gate into a channel region of the first transistor to lower the threshold voltage.
4. The method as claimed in claim 3 , wherein extracting electrons into the channel region includes providing a high state voltage to a source of the first transistor and providing a low state voltage to a control gate of the first transistor.
5. The method as claimed in claim 2 , further comprising injecting electrons into the floating gate to raise the threshold voltage.
6. The method as claimed in claim 5 , wherein injecting electrons into the floating gate includes providing a low state voltage to a source of the first transistor and providing a high state voltage to a control gate of the first transistor.