Pixel driving circuit that can perform a reverse bias reset to an OLED, and pixel driving method

A pixel driving circuit, comprising:

• a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a sixth thin film transistor, a seventh thin film transistor, an eighth thin film transistor, a first capacitor, and an organic light emitting diode;
• wherein the seventh thin film transistor and the eighth thin film transistor are connected to each other, a source of the seventh thin film transistor is connected to a sixth node, a drain of the seventh thin film transistor is connected to a seventh node, a gate of the seventh thin film transistor is connected to a second scanning signal;
• a drain of the eighth thin film transistor is connected to the sixth node, a source of the eighth thin film transistor is connected to the seventh node, and a gate of the eighth thin film transistor is connected to a first scanning signal;
• wherein the sixth node is also connected to a second reset voltage, the seventh node is connected to an eighth node, the eighth node is connected to a first pole of the organic light emitting diode;
• wherein the second reset voltage is a peripheral voltage;
• and
• wherein when the first scanning signal is at a low level, the seventh thin film transistor is turned on, and the organic light emitting diode is subjected to reverse bias reset by the second reset voltage;
• wherein the first thin film transistor is connected to a second node and a ninth node, is turned on in response to a signal of a first node, and connects the second node and the ninth node;
• the second thin film transistor is connected to the second node, and is turned on in response to a signal of a fourth node, and transmits a data signal to the second node;
• the fourth node is connected to the first scanning signal;
• the third thin film transistor is connected to the first node and the ninth node, is turned on in response to a signal of the fourth node, and connects the first node and the ninth node;
• the fourth thin film transistor is connected to a third node, is turned on in response to the second scanning signal, and transmits a first reset voltage signal to the third node;
• the fifth thin film transistor is connected to the second node and a fifth node, is turned on in response to a first control signal, and connects the second node and the fifth node;
• the fifth node is connected to a first power signal;
• the sixth thin film transistor is connected to the ninth node and the eighth node, is turned on in response to the first control signal, and connects the eighth node and the ninth node;
• a first end of the first capacitor is connected to the third node, and a second end of the first capacitor is connected to the fifth node;
• and
• the first pole of the organic light emitting diode is connected to the eighth node, and a second pole of the organic light emitting diode is connected to a second power signal.

A pixel driving method of driving a pixel driving circuit, wherein the pixel driving circuit comprises:

• a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a sixth thin film transistor, a seventh thin film transistor, an eighth thin film transistor, a first capacitor, and an organic light emitting diode;
• wherein the seventh thin film transistor and the eighth thin film transistor are connected to each other, a source of the seventh thin film transistor is connected to a sixth node, a drain of the seventh thin film transistor is connected to a seventh node, a gate of the seventh thin film transistor is connected to a first scanning signal;
• a drain of the eighth thin film transistor is connected to the sixth node, a source of the eighth thin film transistor is connected to the seventh node, and a gate of the eighth thin film transistor is connected to a second scanning signal;
• wherein the sixth node is also connected to a second reset voltage, the seventh node is connected to an eighth node, the eighth node is connected to a first pole of the organic light emitting diode;
• wherein the second reset voltage is a peripheral voltage;
• wherein the pixel driving method comprises:
• when the first scanning signal is at a low level, the seventh thin film transistor is turned on, and the organic light emitting diode is subjected to reverse bias reset by the second reset voltage;
• or
• when the second scanning signal is at a low level, the seventh thin film transistor is turned on, and the organic light emitting diode is subjected to reverse bias reset by the second reset voltage;
• wherein in the pixel driving circuit, the first thin film transistor is connected to a second node and a ninth node, is turned on in response to a signal of a first node, and connects the second node and the ninth node;
• the second thin film transistor is connected to the second node, and is turned on in response to a signal of a fourth node, and transmits a data signal to the second node;
• the fourth node is connected to the first scanning signal;
• the third thin film transistor is connected to the first node and the ninth node, is turned on in response to a signal of the fourth node, and connects the first node and the ninth node;
• the fourth thin film transistor is connected to a third node, is turned on in response to the second scanning signal, and transmits a first reset voltage signal to the third node;
• the fifth thin film transistor is connected to the second node and a fifth node, is turned on in response to a first control signal, and connects the second node and the fifth node;
• the fifth node is connected to a first power signal;
• the sixth thin film transistor is connected to the ninth node and the eighth node, is turned on in response to the first control signal, and connects the eighth node and the ninth node;
• a first end of the first capacitor is connected to the third node, and a second end of the first capacitor is connected to the fifth node;
• and
• the first pole of the organic light emitting diode is connected to the eighth node, and a second pole of the organic light emitting diode is connected to a second power signal.