Apparatus and method of driving electro luminescence panel

A driving apparatus of an electro luminescence panel having gate lines, data lines crossing with the gate lines, and electro luminescence cells OLED at crossing points of the gate lines and the data lines, comprising:

• a first TFT connected between a power supply and a data line and having a gate electrode connected to the data line;
• a second TFT connected between the power supply and an electro luminescence cell OLED;
• a third TFT connected between the power supply and a source electrode of the first TFT for switching according to a signal on a gate line;
• a fourth TFT connected between the data line and a gate electrode of the second TFT for switching according to the signal on the gate line;
• and
• a capacitor connected between the gate electrode of the second TFT and the power supply.

A method of driving a driver circuit of an electroluminescence OLED cell of an electroluminescence panel, the electroluminescence panel having gate lines, data lines crossing with the gate lines, and electro luminescence cells OLED at crossing points of the gate lines and the data lines, the driver circuit having a first TFT connected between a power supply and a data line;

• a second TFT connected between the power supply and an electro luminescence cell OLED;
• a third TFT connected between the power supply and the first TFT for switching according to a signal on gate line;
• a fourth TFT connected between gate electrodes of the first and second TFTs and the data line for switching according to the signal on the gate line;
• and a capacitor connected between the gate electrode of the second TFT and the power supply, the method of driving an electroluminescence cell, comprising:
• supplying an on signal on the gate line to the gates of the third and fourth TFTs such that the first TFT is connected to the power supply and is also connected to the data line and the gates of the first and second TFTs are also connected to the data line such a voltage on the data line is transferred to the gate of the second TFT;
• and
• subsequently supplying an off signal on the gate line to the gates of the third and fourth TFTs such that a source of the first TFT is disconnected from the power supply and the gate of the second TFT is disconnected from the data line;
• whereby a voltage signal on a node of the gate of the second TFT is not discharged to the power supply.

A method of driving a driver circuit of an electroluminescence OLED cell of an electroluminescence panel, the electroluminescence panel having gate lines, data lines crossing with the gate lines, and electro luminescence cells OLED at crossing points of the gate lines and the data lines, the driver circuit having a first TFT connected between a power supply and a data line and having a gate electrode connected to the data line;

• a second TFT connected between the power supply and an electro luminescence cell OLED;
• a third TFT connected between the power supply and a source electrode of the first TFT for switching according to a signal on a gate line;
• a fourth TFT connected between the data line and a gate electrode of the second TFT for switching according to the signal on the gate line;
• and a capacitor connected between the gate electrode of the second TFTs and the power supply, the method of driving the driver circuit comprising:
• supplying an on signal on the gate line to the gates of the third and fourth TFTs such that source of the first TFT is connected to the power supply and the drain of the first TFT is connected to the data line and the gates of the first and second TFTs are connected to each other such that a voltage on the data line is transferred to the gate of the second TFT;
• and
• subsequently supplying an off signal on the gate line to the gates of the third and fourth TFTs such that a source of the first TFT is disconnected from the power supply and the gate of the second TFT is disconnected from the data line;
• whereby a voltage signal on a node of the gate of the second TFT is not discharged to the power supply.