US 12,455,337 B2
Current sensing calibration method and current sensing calibration system capable of correcting temperature data errors
Te-Chieh Kung, Tainan (TW); Ming-Chia Chen, Tainan (TW); Hugo Cruz, Tainan (TW); and Hao-Wei Lin, Tainan (TW)
Assigned to HIMAX TECHNOLOGIES LIMITED, Tainan (TW)
Filed by HIMAX TECHNOLOGIES LIMITED, Tainan (TW)
Filed on Feb. 20, 2024, as Appl. No. 18/581,391.
Claims priority of provisional application 63/528,656, filed on Jul. 25, 2023.
Prior Publication US 2025/0035730 A1, Jan. 30, 2025
Int. Cl. G01R 35/00 (2006.01); G01R 19/00 (2006.01)
CPC G01R 35/005 (2013.01) [G01R 19/0092 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A current sensing calibration method comprising:
setting a first calibration current according to a current range of a display panel;
inputting the first calibration current to a current sensing circuit and detecting a first real digital code outputted from the current sensing circuit;
acquiring offset calibration data according to the first real digital code and a first ideal digital code corresponding to the first calibration current;
setting a second calibration current and a third calibration current according to the current range of the display panel;
inputting the second calibration current to the current sensing circuit and detecting a second real digital code outputted from the current sensing circuit;
inputting the third calibration current to the current sensing circuit and detecting a third real digital code outputted from the current sensing circuit;
acquiring gain calibration data according to the second real digital code, the third real digital code, a second ideal digital code corresponding to the second calibration current, and a third ideal digital code corresponding to the third calibration current Ic3; and
acquiring channel temperature calibration data of at least one pixel of the display panel after the current sensing circuit is calibrated according to the offset calibration data and the gain calibration data.