Pixel circuit of organic light emitting device and organic light emitting display panel
AssigneeWuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
InventorsChunyang Wang, Qi Ouyang
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Abstract
A pixel circuit of an organic light emitting device and an organic light emitting display panel are disclosed. Two steps of a pixel circuit duty cycle can be realized by completing initialization in synchronization during the program period at same time, maintaining a gate voltage of a driving transistor, and compensating for a threshold voltage drift in the driving transistor. Thereby improving response speed of the organic light emitting device, and increasing refresh rate of the display panel.
Claims20
A pixel circuit of an organic light emitting device, comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, and an electroluminescent element;
- wherein the pixel circuit comprises:
- a scanning signal response module, a light emitting signal response module, a first capacitor and a second capacitor;
- the scanning signal response module comprises the second transistor, the third transistor and the seventh transistor;
- the second transistor is for responding to a nth row scanning signal to transmit a data voltage;
- the third transistor is for responding to the nth row scanning signal to compensate threshold voltage drift of the first transistor;
- the seventh transistor is for responding to the nth row scanning signal to control the first capacitor and the second capacitor to store the data voltage, or to control the second capacitor to store the data voltage and an initialization voltage released by the first capacitor, to maintain a gate voltage of the first transistor, and wherein n is a positive integer greater than 1;
- the light emitting signal response module comprises the fourth transistor, the fifth transistor, and the sixth transistor;
- the fourth transistor is for responding to a nth row light emitting signal to transmit the initialization voltage;
- the fifth transistor is for responding to the nth row light emitting signal to provide a power source voltage to the first transistor;
- the sixth transistor is for responding to the nth row light emitting signal to provide a driving electric current generated by the first transistor to the electroluminescent element, and polarities of the initialization voltage and the data voltage are opposite;
- the first capacitor is for storing the initialization voltage when the light emitting signal response module is turned on, storing the data voltage, or releasing the stored initialization voltage when the scanning signal response module is turned on;
- the second capacitor is for storing the data voltage, or storing the data voltage and the initialization voltage released by the first capacitor when the scanning signal response module is turned on;
- the first transistor is for generating the driving electric current according to the data voltage;
- and the electroluminescent element is for emitting light according to the driving electric current.
A pixel circuit of an organic light emitting device, comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor and an electroluminescent element;
- wherein the pixel circuit comprises:
- a scanning signal response module for responding to a nth row scanning signal to transmit a data voltage to maintain a gate voltage of the first transistor and to compensate threshold voltage drift of the first transistor, and wherein n is a positive integer greater than 1;
- a light emitting signal response module for responding to a nth row light emitting signal to transmit an initialization voltage, and polarities of the initialization voltage and the data voltage are opposite;
- a first capacitor for storing the initialization voltage when the light emitting signal response module is turned on, storing the data voltage, or releasing the stored initialization voltage when the scanning signal response module is turned on;
- and a second capacitor for storing the data voltage when the scanning signal response module is turned on, or storing the data voltage and the initialization voltage released by the first capacitor when the scanning signal response module is turned on;
- the first transistor for generating a driving electric current according to the data voltage;
- the electroluminescent element is for emitting light according to the driving electric current.
An organic light emitting display panel comprising at least one pixel circuit, and the pixel circuit comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, and an electroluminescent element;
- wherein the pixel circuit further comprises:
- a scanning signal response module for responding to a nth row scanning signal to transmit a data voltage to maintain a gate voltage of the first transistor and to compensate threshold voltage drift of the first transistor, and wherein n is a positive integer greater than 1;
- a light emitting signal response module for responding to a nth row light emitting signal to transmit an initialization voltage;
- and wherein polarities of the initialization voltage and the data voltage are opposite;
- a first capacitor for storing the initialization voltage when the light emitting signal response module is turned on, storing the data voltage, or releasing the stored initialization voltage when the scanning signal response module is turned on;
- a second capacitor for storing the data voltage when the scanning signal response module is turned on, or storing the data voltage and the initialization voltage released by the first capacitor when the scanning signal response module is turned on;
- the first transistor for generating a driving electric current according to the data voltage;
- and
- the electroluminescent element for emitting light according to the driving electric current.
Dependencies are inferred from the claim text.