Pixel circuit, display device and driving method of the pixel circuit

Abstract

The embodiment of the invention relates to the field of display, and discloses a pixel circuit, a display device and a driving method of the pixel circuit. The pixel circuit comprises a first transistor, a second transistor, a third transistor, a storage device and a light emitting device. The control end of the first transistor is connected with a scanning line; the first end of the first transistor is connected with a data line; and the second end of the first transistor is connected with an output node. The first end of the storage device is connected with the output node, and the second end of the storage device is connected with a control line. The control end of the second transistor is connected with the output node; the first end of the second transistor is connected with a power voltage; and the second end of the second transistor is connected with the anode of the light-emitting device. The control end of the third transistor is connected with the control end of the first transistor; the third transistor is connected to the anode and the cathode of the light-emitting device in parallel; and the cathode of the light-emitting device is connected with reference voltage. Therefore, under the condition that the storage capacitance of the pixel circuit is not changed, the control on the light-emitting brightness of the pixel circuit is improved.

Description

technical field [0001] The embodiments of the present invention relate to the field of display technology, and in particular to a pixel circuit, a display device, and a driving method for the pixel circuit. Background technique [0002] Organic light-emitting diode (Organic Light-Emitting Diode, OLED), as a current-mode light-emitting device, has been increasingly used due to its characteristics of self-illumination, fast response, wide vision and can be fabricated on flexible substrates. It is used in the field of high-performance display. OLED can be divided into PMOLED (Passive matrix organic light-emitting diode, passive matrix organic light emitting diode) and AMOLED (Active-matrix organic light-emitting diode, active matrix organic light emitting diode) according to the driving method. With the rapid development of flat panel display technology, especially AMOLED display screens have begun to be widely used in electronic display products such as high-end mobile phones...

AI Technical Summary

Problems solved by technology

[0003] However, the inventors have found that at least the following problems exist in the prior art: in high-end display products, pixel drive circuits generally use active arrays, but mainstream active drive array circuits are driven by analog signals, resulting in high circuit power consumption and signal Susceptible to interference, high dependence on the consistency of driving devices or compensation circuits, etc.

Due to the small pixel size in high-pixel-density display products, the storage capacitor in the pixel design of the digital drive circuit is too small, and the luminance of the light-emitting device cannot be accurately controlled and adjusted, resulting in uneven brightness of the pixel circuit.

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