US 12,340,727 B1
Display driving device and method
Hyoungkyu Kim, Cheongju-si (KR); Iljun Kim, Cheongju-si (KR); and Okyeon Park, Cheongju-si (KR)
Assigned to Magnachip Mixed-Signal, Ltd., Cheongju-si (KR)
Filed by Magnachip Mixed-Signal, Ltd., Cheongju-si (KR)
Filed on Jul. 22, 2024, as Appl. No. 18/779,249.
Claims priority of application No. 10-2023-0187037 (KR), filed on Dec. 20, 2023.
Int. Cl. G09G 3/20 (2006.01)
CPC G09G 3/2092 (2013.01) [G09G 2310/0275 (2013.01); G09G 2310/08 (2013.01); G09G 2330/023 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A display driving device, comprising:
a timing controller configured to generate a pumping clock signal and an anti-tearing signal identifying an active period and a porch period based on a vertical synchronization signal; and
a charge pump configured to output a pump voltage for driving a source driver, the charge pump comprising:
a flying capacitor;
a first switch disposed between one end of the flying capacitor and a first terminal connected to a first external voltage;
a second switch disposed between the one end of the flying capacitor and a second terminal outputting a first output voltage;
a third switch disposed between another end of the flying capacitor and a third terminal connected to a second external voltage;
a fourth switch disposed between the another end of the flying capacitor and a fourth terminal outputting a second output voltage; and
a charge pump control unit configured to control turning on or off of the first to the fourth switches based on the anti-tearing signal, and control the first to the fourth switches based on the anti-tearing signal to operate in a first mode or a second mode,
wherein the second mode is configured to reduce power consumption than in the first mode.