US 12,315,426 B2
Device and method for internal horizontal sync signal generation
Kazuhiro Okamura, Tokyo (JP); Keiichi Hirano, Kanagawa (JP); and Hirokazu Hatayama, Kanagawa (JP)
Assigned to Synaptics Incorporated, San Jose, CA (US)
Filed by Synaptics Incorporated, San Jose, CA (US)
Filed on Sep. 25, 2023, as Appl. No. 18/473,722.
Prior Publication US 2025/0104598 A1, Mar. 27, 2025
Int. Cl. G09G 3/20 (2006.01)
CPC G09G 3/2096 (2013.01) [G09G 2310/0243 (2013.01); G09G 2310/0264 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A display driver, comprising:
a timing controller configured to:
receive an external horizontal sync signal; and
generate an internal horizontal sync signal based on the external horizontal sync signal; and
a driver circuit configured to drive a display panel in synchronization with the internal horizontal sync signal,
wherein generating the internal horizontal sync signal comprises:
generating a first pulse of the internal horizontal sync signal in response to detection of a first pulse of the external horizontal sync signal after a masking period has expired, wherein the masking period starts when the timing controller detects a first previous pulse of the external horizontal sync signal before the detection of the first pulse of the external horizontal sync signal; and
generating a second pulse of the internal horizontal sync signal in response to detection of a second pulse of the external horizontal sync signal in a non-masking period which starts when the timing controller detects a second previous pulse of the external horizontal sync signal before the detection of the second pulse of the external horizontal sync signal, wherein the non-masking period starts in response to a count of pulses of the external horizontal sync signal reaching a predetermined number.