US 11,854,459 B2
Method for driving a pixel circuit
Ling Wang, Langfang (CN); Cuili Gai, Langfang (CN); and Lei Mi, Langfang (CN)
Assigned to YUNGU (GU'AN) TECHNOLOGY CO., LTD., Langfang (CN)
Filed by YUNGU (GU'AN) TECHNOLOGY CO., LTD., Hebei (CN)
Filed on Nov. 16, 2022, as Appl. No. 17/988,091.
Application 17/988,091 is a continuation of application No. PCT/CN2021/103039, filed on Jun. 29, 2021.
Claims priority of application No. 202010905021.3 (CN), filed on Sep. 1, 2020.
Prior Publication US 2023/0083238 A1, Mar. 16, 2023
Int. Cl. G09G 3/20 (2006.01)
CPC G09G 3/2092 (2013.01) [G09G 2310/027 (2013.01); G09G 2310/0278 (2013.01); G09G 2320/0233 (2013.01); G09G 2320/0257 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for driving a pixel circuit, wherein the pixel circuit comprises a drive transistor, and the method comprises:
acquiring a theoretical threshold voltage of the drive transistor and actual threshold voltages of the drive transistor at a plurality of different gray levels;
determining compensation data voltages of the drive transistor at the plurality of different gray levels according to the theoretical threshold voltage of the drive transistor and the actual threshold voltages of the drive transistor at the plurality of different gray levels;
driving the pixel circuit to emit light according to the compensation data voltages of the drive transistor at the plurality of different gray levels,
providing a preset voltage, writing the preset voltage to a gate of the drive transistor through threshold compensation until a gate potential of the drive transistor remains unchanged, reading a current gate potential of the drive transistor and determining the theoretical threshold voltage of the drive transistor according to the preset voltage and the current gate potential of the drive transistor; and
providing a plurality of different gray level voltages corresponding to the plurality of different gray levels sequentially, writing the plurality of different gray level voltages to the gate of the drive transistor through the threshold compensation, reading a plurality of gate potentials of the drive transistor in one-to-one correspondence with the plurality of different gray level voltages and determining the actual threshold voltages of the drive transistor at the plurality of different gray levels according to the plurality of different gray level voltages and the plurality of gate potentials of the drive transistor in one-to-one correspondence with the plurality of different gray level voltages.