US 11,721,252 B2
Control circuit and display device
Ta-Chin Chiu, Hsinchu Science Park (TW); Tu-Yiin Chang, Hsinchu Science Park (TW); and Wen-Yi Li, Jhonghe Dist. (TW)
Assigned to NUVOTON TECHNOLOGY CORPORATION, Hsinchu Science Park (TW)
Filed by Nuvoton Technology Corporation, Hsinchu Science Park (TW)
Filed on Dec. 14, 2020, as Appl. No. 17/120,966.
Claims priority of application No. 108145916 (TW), filed on Dec. 16, 2019.
Prior Publication US 2021/0183285 A1, Jun. 17, 2021
Int. Cl. G09G 3/00 (2006.01); G09G 3/36 (2006.01)
CPC G09G 3/006 (2013.01) [G09G 3/3696 (2013.01); G09G 2330/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A control circuit for driving a display panel and comprising:
a transmission interface configured to be coupled to the display panel;
a charging circuit providing a charging signal to charge a capacitor;
an image driving circuit, transforming the voltage of the capacitor into a plurality of driving signals and providing the driving signals to the display panel via the transmission interface; and
a loading management circuit, measuring a charge time of the capacitor according to the charging signal,
wherein:
in response to the charge time of the capacitor exceeding a threshold value, the loading management circuit asserts a flag to indicate an occurrence of an overload, and
the loading management circuit obtains the charge time of the capacitor according to the number of pulses of the charging signal in a predetermined time or the duration of the charging signal being at a specific level in the predetermined time,
in response to the flag being asserted:
the image driving circuit generates a test signal and provides the test signal to the display panel via at least one first pin of the transmission interface,
the load management circuit determines whether the charge time of the capacitor exceeds the threshold value,
in response to the charge time of the capacitor exceeding the threshold value, it is determined that the first pin causes the overload, and
in response to the charge time of the capacitor not exceeding the threshold value, the image driving circuit provides the test signal to the display panel via at least one second pin of the transmission interface.