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CN-122024648-A - Pixel driving circuit and display device

CN122024648ACN 122024648 ACN122024648 ACN 122024648ACN-122024648-A

Abstract

The invention discloses a pixel driving circuit and a display device, comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, a second capacitor and a seventh transistor, wherein the first transistor is used for switching between a data signal and a first node in response to a first control signal, the second transistor is used for switching between a working voltage signal and a third node in response to a voltage of the second node, the third transistor is used for switching between the second node and the third node in response to a second control signal, the fourth transistor is used for switching between a third reference voltage and the first node in response to a second control signal, the fifth transistor is used for switching between the third node and a light emitting diode in response to an enabling signal, the sixth transistor is used for switching between the first reference voltage and the second node in response to a scanning signal, and the second capacitor is coupled between the first node and the second node. The invention can compensate the charging time of the driving circuit, so that the display effect of the panel is more uniform.

Inventors

  • LIU JIE
  • ZHANG HAN
  • ZENG YINGXIANG

Assignees

  • 上海和辉光电股份有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. A pixel driving circuit, comprising: a first transistor (T1) for switching a current path between the data signal and the first node (N1) in response to a first control signal (sn_t1); a second transistor (T2) for switching a current path between the operating voltage signal (ELVDD) and the third node (N3) in response to a voltage of the second node (N2); A third transistor (T3) for switching a current path between the second node (N2) and a third node (N3) in response to a second control signal (sn_t3); A fourth transistor (T4) for switching a current path between the third reference voltage (Vint 3) and the first node (N1) in response to the second control signal (sn_t3); A fifth transistor (T5) for switching a current path between the third node (N3) and an anode of a Light Emitting Diode (LED), a cathode of which is connected to a ground signal (ELVSS), in response to an enable signal (em_t5); a sixth transistor (T6) for switching a current path between the first reference voltage (Vint 1) and the second node (N2) in response to the scan signal (SN-1); A seventh transistor (T7) for switching a current path between the second reference voltage (Vint 2) and the anode of the Light Emitting Diode (LED) in response to the scan signal (SN+1), and A second capacitor (C2) coupled between the first node (N1) and a second node (N2).
  2. 2. The pixel drive circuit according to claim 1, further comprising: A first capacitor (C1) coupled between the first node (N1) and the operating voltage signal (ELVDD).
  3. 3. A pixel driving circuit according to claim 1, wherein the first transistor (T1), the second transistor (T2), the third transistor (T3), the fourth transistor (T4), the fifth transistor (T5), the sixth transistor (T6) and the seventh transistor (T7) are all N-type thin film transistors.
  4. 4. A pixel driving circuit according to claim 1, wherein the first transistor (T1), the second transistor (T2), the third transistor (T3), the fourth transistor (T4), the fifth transistor (T5), the sixth transistor (T6) and the seventh transistor (T7) are P-type thin film transistors.
  5. 5. A pixel driving circuit according to claim 1, wherein the first transistor (T1) is a double gate transistor.
  6. 6. A pixel driving circuit according to claim 1, wherein the third transistor (T3) is a double gate transistor.
  7. 7. A pixel driving circuit according to claim 1, wherein the fourth transistor (T4) is a double gate transistor.
  8. 8. A pixel driving circuit according to claim 1, wherein the sixth transistor (T6) is a double gate transistor.
  9. 9. A pixel driving circuit according to claim 1, wherein the first transistor (T1), the third transistor (T3), the fourth transistor (T4), and the sixth transistor (T6) are dual-gate transistors.
  10. 10. A display device according to claim 1, comprising a pixel driving circuit.

Description

Pixel driving circuit and display device Technical Field The invention relates to the field of OLED devices, in particular to a pixel driving circuit and a display device. Background Recently, various flat panel displays having a smaller weight and volume than cathode ray tube displays have been developed, including liquid crystal displays, field emission displays, plasma display panels, and organic light emitting displays. Among flat panel displays, organic light emitting displays display images using Organic Light Emitting Diodes (OLEDs) that generate light by recombination of electrons and holes. The organic light emitting display has a faster response speed and is driven with lower power consumption. A typical organic light emitting display supplies a current according to a data signal to an OLED light emitting device through a transistor formed in a pixel, thereby emitting light from the OLED light emitting device. Organic light emitting displays are classified according to driving types, and may be classified into a passive driving type (PMOLED) which does not use a thin film transistor substrate and an active driving type (AMOLED) which uses a thin film transistor substrate. Each pixel of the active-driven organic light-emitting display is provided with a low-temperature polysilicon thin film transistor with a switching function, and each pixel is provided with a storage capacitor, and the peripheral driving circuit and the display component are integrated on the same glass substrate. Each pixel generates a driving current according to a data signal, and the brightness of the organic light emitting diode is controlled by adjusting the driving current of the OLED light emitting device. Because the process has fluctuation, the threshold voltages of the driving transistors among different pixel circuits are different, and the signal noise and the uneven display of the IC power supply are easy to generate. Especially for the high screen brushing of 240Hz, the uneven display phenomenon is more prominent, the display quality is reduced, and the visual fatigue of the user is easier to occur in the using process. In view of the above drawbacks, the present invention provides a pixel driving circuit and a display device. The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is not already known in this country to a person of ordinary skill in the art. Disclosure of Invention Aiming at the problems in the prior art, the invention aims to provide a pixel driving circuit and a display device, which overcome the difficulties in the prior art, can compensate the charging time of the driving circuit and lead the display effect of a panel to be more uniform. An embodiment of the present invention provides a pixel driving circuit including: a first transistor for switching a current path between the data signal and the first node in response to a first control signal; A second transistor for switching a current path between the operating voltage signal and the third node in response to a voltage of the second node; a third transistor for switching a current path between the second node and a third node in response to a second control signal; A fourth transistor for switching a current path between the third reference voltage and the first node in response to the second control signal; a fifth transistor for switching a current path between the third node and an anode of the light emitting diode in response to an enable signal, a cathode of the light emitting diode being connected to a ground signal; a sixth transistor for switching a current path between the first reference voltage and the second node in response to the scan signal; A seventh transistor for switching a current path between the second reference voltage and the anode of the light emitting diode in response to the scan signal, and And a second capacitor coupled between the first node and a second node. Preferably, the circuit further comprises a first capacitor coupled between the first node and the operating voltage signal. Preferably, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor and the seventh transistor are all N-type thin film transistors. Preferably, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor and the seventh transistor are P-type thin film transistors. Preferably, the first transistor is a double gate transistor. Preferably, the third transistor is a double gate transistor. Preferably, the fourth transistor is a double gate transistor. Preferably, the sixth transistor is a double gate transistor. Preferably, the first transistor, the third transistor, the fourth transistor and the sixth transistor are all double-gat