Patent ID: 7808455
Filing Date: 2010-10-05
Classification: G09G

Abstract:
1. Method for compensating for a threshold voltage of a driver element, comprising: (a) providing a light emitting element having a first electrode, connected to a first power source line, and a second electrode wherein the light emitting element has a threshold voltage; (b) providing the driver element having the threshold voltage, a gate electrode, a first electrode connected to the second electrode of the light emitting element, and a second electrode connected to a second power source line, so that the driver element controls current flowing in the light emitting element; (c) providing a switching element having a gate electrode connected to a switching line, a first electrode connected to the gate electrode of the driver element, and a second electrode connected to a signal line; (d) providing a capacitor disposed between the gate and first electrodes of the driver element; and (e) performing the following steps in order: (ii) applying a selected second voltage to the first power source line such that the potential difference across the light emitting element is less than the threshold voltage of the light emitting element, wherein the light emitting element is turned off, a first electric current flows through the driver element in a first direction, and the threshold voltage of the driver element is stored in the capacitor; (iii) applying a selected data voltage to the signal line, wherein the selected data voltage is applied to the gate electrode of the driver element and setting the potential of the scanning line to a second level to turn the switching element off; and (iv) applying a selected third voltage to the first power source line such that the potential difference across the light emitting element is greater than the threshold voltage of the light emitting element, wherein a second electric current flows through the driver element in a second direction and is thereby supplied to the light emitting element to cause it to emit light; wherein the second electric current is irrespective of the threshold voltage of the driver element, and therefore compensation is made for the threshold voltage of the driver element.