Organic light emitting diode pixel driving circuit and display device

An organic light emitting diode pixel driving circuit in a display panel, comprising:

• a plurality of pixel elements;
• a plurality of data lines;
• a plurality of intra-pixel circuits, each comprising a signal loading module, a driving transistor, and an organic light emitting diode, wherein the number of the plurality of intra-pixel circuits is an integer ranging from 2 to the total number of the pixel elements on the display panel;
• a common circuit, wherein a first terminal of the common circuit receives a first power supply signal, a second terminal of the common circuit is connected respectively with a source of the driving transistor of each of the plurality of intra-pixel circuits, wherein the common circuit is shared by the plurality of pixel elements;
• wherein a first terminal of the signal loading module receives the first power supply signal, a second terminal of the signal loading module is connected with the source of the driving transistor of each of the plurality of intra-pixel circuits, a third terminal of the signal loading module is connected with a gate of the driving transistor of each of the plurality of intra-pixel circuits, a fourth terminal of the signal loading module is connected with a drain of the driving transistor of each of the plurality of intra-pixel circuits, a fifth terminal of the signal loading module is connected with an anode of the organic light emitting diode of each of the plurality of the intra-pixel circuits, a cathode of the organic light emitting diode receives a second power supply signal, and a sixth terminal of the signal loading module receives an image data signal,
• wherein each of the signal loading modules is configured to receive a first scan signal and a second scan signal, in a signal loading phase, under the control of the first scan signal and the second scan signal to load the image data signal received by its sixth terminal to the source of the driving transistor of each of the plurality of the intra-pixel circuits by its second terminal, to have its third terminal connected with its fourth terminal to generate and store a drive signal, and to have its fourth terminal disconnected from its fifth terminal,
• wherein each of the signal loading modules is configured, in a light emitting phase, under the control of the first scan signal and the second scan signal to have its third terminal disconnected from its fourth terminal, to have its fourth terminal connected with its fifth terminal, and to control the driving transistor of each of the plurality of intra-pixel circuits by the drive signal stored in the signal loading phase and the signal at the source of the driving transistor of each of the plurality of intra-pixel circuits to drive the organic light emitting diode of each of the plurality of the intra-pixel circuits to emit light,
• wherein the common circuit is configured to have its first terminal disconnected from its second terminal in the signal loading phase, and to have its first terminal connected with its second terminal in the light emitting phase,
• wherein in the light emitting phase, the drain current of the driving transistor of each of the plurality of intra-pixel circuits is independent from threshold voltage of the driving transistor of each of the plurality of intra-pixel circuits, and is dependent on a voltage of the first power supply signal and a voltage of the image data signal,
• wherein each of the signal loading modules comprises a first drive signal generation and storage element,
• wherein a first terminal of the first drive signal generation and storage element is the first terminal of the signal loading module, a second terminal of the first drive signal generation and storage element is the third terminal of the signal loading module, and a third terminal of the first drive signal generation and storage element is the fourth terminal of the signal loading module,
• wherein the first drive signal generation and storage element is configured to have its second terminal connected N ith its third terminal in the signal loading phase to generate the drive signal from the signal at the source of the driving transistor of each of the plurality of intra-pixel circuits and store the drive signal, and in the remaining period of the signal loading phase and in the light emitting phase, to have its second terminal disconnected from its third terminal:
• and in the light emitting phase, to control the driving transistor by the stored drive signal to drive the organic light emitting diode to emit light,
• wherein the first drive signal generation and storage element further comprises a first capacitor and a fourth switch transistor,
• wherein one terminal of the first capacitor is the first terminal of the first drive signal generation and storage element, and another terminal of the first capacitor is the second terminal of the first drip e signal generation and storage element,
• wherein a first terminal of the fourth switch transistor is the second terminal of the first drive signal generation and storage element, a gate of the fourth switch transistor receives the second scan signal, which is the same as a signal on a gate line connected with the pixel element where the intra-pixel circuit comprising the first drive signal generation and storage element is located, and a second terminal of the fourth switch transistor is the third terminal of the first drive signal generation and storage element,
• the gate of the fourth switch transistor receives the fourth scan signal, and a second terminal of the fourth switch transistor is the third terminal of the second drive signal generation and storage element,
• wherein the fourth switch transistor is configured to be turned on in the portion of the signal loading phase, and to be turned off in the remaining portion of the signal loading phase and in the light emitting phase, and
• wherein the first capacitor is configured to store the drive signal.