US 12,243,455 B2
Method for adjusting ghosting reduction potential, row driving circuit and LED display device
Qian Bi, Beijing (CN)
Assigned to CHIPONE TECHNOLOGY (BEIJING) CO., LTD., Beijing (CN)
Appl. No. 18/021,170
Filed by Chipone Technology (Beijing) Co., Ltd., Beijing (CN)
PCT Filed Dec. 17, 2020, PCT No. PCT/CN2020/137357
§ 371(c)(1), (2) Date Feb. 13, 2023,
PCT Pub. No. WO2022/032953, PCT Pub. Date Feb. 17, 2022.
Claims priority of application No. 202010809984.3 (CN), filed on Aug. 12, 2020.
Prior Publication US 2023/0316963 A1, Oct. 5, 2023
Int. Cl. G09G 3/32 (2016.01); G09G 3/00 (2006.01); G09G 3/20 (2006.01)
CPC G09G 3/006 (2013.01) [G09G 3/2096 (2013.01); G09G 3/32 (2013.01); G09G 2310/0297 (2013.01); G09G 2320/0257 (2013.01); G09G 2330/028 (2013.01); G09G 2330/08 (2013.01); G09G 2330/12 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for adjusting a ghost reduction potential, wherein the method is realized by a row driving circuit comprising at least one row driver chip, each of which comprises a ghost reduction potential generation circuit configured to generate a first voltage and a second voltage; the ghost reduction potential generation circuit comprises a multiplexer; the method comprises:
receiving, by the at least one row driver chip, an open-circuit detection signal and a short-circuit detection signal from a row driving side of an LED display panel; and
according to the open-circuit detection signal and the short-circuit detection signal, by the at least one row driver chip, generating a control signal and transmitting the control signal to the multiplexer, so as to control the multiplexer to select only the first voltage as the ghost reduction potential, select only the second voltage as the ghost reduction potential, select the first voltage and the second voltage as the ghost reduction potential in sequence, or select the second voltage and the first voltage as the ghost reduction potential in sequence, wherein at least one output channel of the at least one row driver chip is configured to output the ghost reduction potential to the row driving side of the LED display panel,
wherein the open-circuit detection signal is generated for indicating that one or more LED component is affected by an open-circuit caterpillar phenomenon, when an output voltage of a corresponding one of the at least one output channel is detected to be less than a forward turn-on voltage of each LED component,
wherein cathodes of corresponding LED components in the LED display panel are directly connected to a corresponding row driving line which has an output end at the row driving side of the LED display panel,
wherein the output end of the corresponding row driving line is directly connected to a first current terminal of a corresponding MOS transistor that has a second current terminal directly connected to ground, and an output terminal of the multiplexer is directly connected to the output end of the corresponding row driving line to apply the ghost reduction potential to the cathodes of corresponding LED components.