US 12,322,332 B2
Pixel circuit configured to control light-emitting element
Genshiro Kawachi, Kanagawa (JP)
Assigned to Wuhan Tianma Micro-Electronics Co., Ltd., Wuhan (CN)
Filed by Wuhan Tianma Micro-Electronics Co., Ltd., Wuhan (CN)
Filed on Jun. 6, 2022, as Appl. No. 17/833,112.
Claims priority of application No. 2021-096984 (JP), filed on Jun. 10, 2021; and application No. 2022-023111 (JP), filed on Feb. 17, 2022.
Prior Publication US 2022/0398980 A1, Dec. 15, 2022
Int. Cl. G09G 3/3233 (2016.01)
CPC G09G 3/3233 (2013.01) [G09G 2300/0426 (2013.01); G09G 2300/0842 (2013.01); G09G 2300/0861 (2013.01); G09G 2310/08 (2013.01); G09G 2320/0257 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A pixel circuit configured to control light emission of a light-emitting diode, the pixel circuit comprising:
the light-emitting diode;
a driving transistor configured to control driving current to the light-emitting diode;
a storage capacitor directly connected to a gate of the driving transistor and being configured to store control voltage for the driving transistor;
a first switching transistor configured to connect or disconnect between the gate and a drain of the driving transistor;
a second switching transistor directly connected to a data line;
a third switching transistor electrically connecting the second switching transistor and a source of the driving transistor, the second switching transistor and the third switching transistor being configured to transfer a data signal voltage from the data line to the storage capacitor through the driving transistor and the first switching transistor;
a fourth switching transistor electrically connecting a reset power supply and an anode electrode of the light-emitting diode, and
an auxiliary capacitor directly connected to the second switching transistor and the third switching transistor, the auxiliary capacitor being configured to store auxiliary charges that depend on the data signal voltage from the data line,
wherein the auxiliary capacitor retains the auxiliary charges in accordance with the data signal voltage from the data line during a first period in a frame period where the second switching transistor, the third switching transistor and the first switching transistor are ON,
wherein the auxiliary charges are transferred from the auxiliary capacitor to the storage capacitor through the third switching transistor, the first switching transistor and the driving transistor during a second period following the first period in the frame period where the second switching transistor is OFF and the first switching transistor and the third switching transistor are ON,
wherein the auxiliary capacitor is a first auxiliary capacitor,
wherein the pixel circuit further includes a second auxiliary capacitor,
wherein the first auxiliary capacitor is connected between a power supply line provided to supply an anode current for the light-emitting diode and a node between the second switching transistor and the driving transistor,
wherein the second auxiliary capacitor is connected between the node between the second switching transistor and the driving transistor and the anode electrode of the light-emitting diode, and
wherein the fourth switching transistor is ON during the first period.