Patent ID: 9058774
Filing Date: 2015-06-16
Classification: G09G

Abstract:
1. A pixel, comprising: a first transistor coupled between a first power source and a first node, the first transistor including a gate electrode coupled to a second node; an organic light emitting diode (OLED) coupled between the first node and a second power source; a second transistor configured to supply a data signal to the second node in response to a scan signal; a third transistor having a source electrode and a drain electrode electrically coupled to each other, the third transistor being coupled to the first power source and the second node; and a fourth transistor having a source electrode and a drain electrode electrically coupled to each other, the fourth transistor being coupled between the second node and the first node, wherein: the data signal has a substantially constant first value for substantially an entire period of a first time when the second transistor is turned on by the scan signal and the first transistor is turned on, the third transistor to form a first channel and the fourth transistor set to an off state based on the substantially constant first value of the data signal during the first time, formation of the first channel causes the third transistor to operate as a metal oxide semiconductor (MOS) capacitor to store a first difference voltage corresponding to a difference between a voltage of the first power source and the substantially constant first value of the data signal, the first transistor to turn on based on the first difference voltage to cause the OLED to emit light, the data signal has a substantially constant second value for substantially an entire period of a second time when the second transistor is turned on by the scan signal and the first transistor is turned off, the fourth transistor to form a second channel and the third transistor set to an off state based on the substantially constant second value of the data signal during the second time, formation of the second channel causes the fourth transistor to operate as a MOS capacitor to store a second difference voltage corresponding to a difference between the substantially constant second voltage and an electrode voltage of the OLED, the second difference voltage to turn off the first transistor, and the data signal only has the first value and the second value.