US 11,854,491 B2
Mode switching in display device for driving a display panel
Hirokazu Hatayama, Kanagawa (JP); Makoto Takeuchi, Kanagawa (JP); and Shigeru Ota, Tokyo (JP)
Assigned to Synaptics Incorporated, San Jose, CA (US)
Filed by Synaptics Incorporated, San Jose, CA (US)
Filed on Mar. 24, 2022, as Appl. No. 17/703,925.
Prior Publication US 2023/0306913 A1, Sep. 28, 2023
Int. Cl. G09G 3/3275 (2016.01)
CPC G09G 3/3275 (2013.01) [G09G 2360/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A display driver, comprising:
a graphic random access memory (GRAM);
a data driver configured to:
in a first mode, update a plurality of display elements of a display panel based at least in part on a command provided to the display driver asynchronously with a display vertical sync signal generated in the display driver,
in a second mode, update the display elements of the display panel based at least in part on first image data stored in the GRAM in synchronization with the display vertical sync signal, and
in a third mode, update the display elements of the display panel in synchronization with an external vertical sync signal; and
a control circuit configured to:
switch the display driver from the first mode to the second mode in response to a first command,
in the second mode, adjust the display vertical sync signal based at least in part on the external vertical sync signal, wherein adjusting the display vertical sync signal comprises adjusting a periodicity of a display horizontal sync signal in order to synchronize the display vertical sync signal with an emission synchronization signal, wherein the emission synchronization signal is generated in synchronization with the external vertical sync signal; and
switch the display driver to the third mode after achieving synchronization of the display vertical sync signal with the external vertical sync signal.