US 9,812,082 B2
Pixel circuit, driving method, display panel and display device
Dan Chen, Shanghai (CN); Dong Qian, Shanghai (CN); and Hanyu Gu, Shanghai (CN)
Assigned to SHANGHAI TIANMA AM-OLED CO., LTD., Shanghai (CN); and TIANMA MICRO-ELECTRONICS CO., LTD., Shenzhen (CN)
Filed by Shanghai Tianma AM-OLED Co., Ltd., Shanghai (CN); and Tianma Micro-Electronics Co., Ltd., Shenzhen (CN)
Filed on Oct. 15, 2015, as Appl. No. 14/884,442.
Claims priority of application No. 2014 1 0857191 (CN), filed on Dec. 30, 2014.
Prior Publication US 2016/0189606 A1, Jun. 30, 2016
Int. Cl. G09G 3/36 (2006.01); G09G 3/32 (2016.01); G09G 3/3233 (2016.01); G09G 3/3283 (2016.01)
CPC G09G 3/3659 (2013.01) [G09G 3/3233 (2013.01); G09G 3/3283 (2013.01); G09G 2300/0819 (2013.01); G09G 2300/0842 (2013.01); G09G 2300/0861 (2013.01); G09G 2320/0233 (2013.01); G09G 2320/043 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A pixel circuit comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a driving transistor, a storage capacitor and a light emitting element,
wherein a magnitude of a driving current of the driving transistor is determined by a gate-source voltage of the driving transistor; the first transistor is controlled by a first driving signal and is configured to transmit a first power supply signal to a drain of the driving transistor;
the second transistor is controlled by a first scanning signal and is configured to transmit the first power supply signal to a first plate of the storage capacitor and a gate of the driving transistor;
the third transistor is controlled by a second scanning signal and is configured to transmit a data signal to a source of the driving transistor;
the fourth transistor is controlled by a second driving signal and is configured to transmit a voltage of the source of the driving transistor to a second plate of the storage capacitor;
the fifth transistor is controlled by the first scanning signal and is configured to transmit a first reference voltage to the second plate of the storage capacitor;
the sixth transistor is controlled by the second driving signal and is configured to transmit the driving current from the driving transistor to an anode of the light emitting element; and
a cathode of the light emitting element is connected to a second power supply signal, and the light emitting element is configured to emit light in response to the driving current,
wherein a gate of the first transistor receives the first driving signal, a first electrode of the first transistor receives the first power supply signal, and a second electrode of the first transistor is electrically connected to a fourth node;
a gate of the second transistor receives the first scanning signal, a first electrode of the second transistor is electrically connected to a first node, and a second electrode of the second transistor is electrically connected to the fourth node;
the gate of the driving transistor is electrically connected to the first node, the drain of the driving transistor is electrically connected to the fourth node, and the source of the driving transistor is electrically connected to a third node;
a gate of the third transistor receives the second scanning signal, a first electrode of the third transistor receives the data signal, and a second electrode of the third transistor is electrically connected to the third node;
a gate of the fourth transistor receives the second driving signal, a first electrode of the fourth transistor is electrically connected to a second node, and a second electrode of the fourth transistor is electrically connected to the third node;
a gate of the fifth transistor receives the first scanning signal, a first electrode of the fifth transistor is electrically connected to the second node, and a second electrode of the fifth transistor receives the first reference voltage;
a gate of the sixth transistor receives the second driving signal, a first electrode of the sixth transistor is electrically connected to the third node, a second electrode of the sixth transistor is electrically connected to the anode of the light emitting element, and
the cathode of the light emitting element receives the second power supply signal; and
the first plate of the storage capacitor is electrically connected to the first node, and the second plate of the storage capacitor is electrically connected to the second node.