US 12,136,394 B2
Systems and methods for external off-time pixel sensing
Hyunwoo Nho, Palo Alto, CA (US); Myungjoon Choi, Sunnyvale, CA (US); Hyunsoo Kim, Mountain View, CA (US); Mohammad Ali Jangda, Santa Clara, CA (US); Jie Won Ryu, Santa Clara, CA (US); Shiping Shen, Cupertino, CA (US); Kingsuk Brahma, Mountain View, CA (US); Chaohao Wang, Sunnyvale, CA (US); Wei H. Yao, Palo Alto, CA (US); and Alex H. Pai, Milpitas, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Feb. 26, 2020, as Appl. No. 16/802,354.
Claims priority of provisional application 62/836,592, filed on Apr. 19, 2019.
Prior Publication US 2020/0335040 A1, Oct. 22, 2020
Int. Cl. G09G 3/3258 (2016.01); G09G 3/3233 (2016.01)
CPC G09G 3/3258 (2013.01) [G09G 3/3233 (2013.01); G09G 2300/0842 (2013.01); G09G 2310/0251 (2013.01); G09G 2310/0262 (2013.01); G09G 2310/04 (2013.01); G09G 2320/0233 (2013.01); G09G 2320/0295 (2013.01); G09G 2320/045 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electronic display comprising:
a pixel, wherein the pixel comprises:
a diode configured to emit light based at least in part on an amount of current through the diode; and
a driver transistor configured to control the amount of current flowing through the diode based at least in part on a voltage applied to the driver transistor;
driver-integrated circuitry configured to, during a current sensing process associated with not displaying image content via the diode:
send a hysteresis-reducing signal to the driver transistor;
send a threshold-settling signal to the driver transistor;
send a test voltage to the driver transistor without illuminating the diode, wherein the driver-integrated circuitry is configured to send the test voltage to the driver transistor without illuminating the diode by reducing a source voltage of the driver transistor, wherein the diode is directly electrically coupled to a drain of the driver transistor; and
sense a current across the driver transistor in response to the test voltage;
a plurality of display regions, wherein a first display region of the plurality of display regions comprises the pixel; and
a plurality of power planes configured to selectively supply independent supply voltages to the plurality of display regions, wherein a first power plane of the plurality of power planes is configured to supply a first supply voltage of the independent supply voltages to the first display region during the current sensing process, and wherein a second power plane of the plurality of power planes is configured to supply a second supply voltage of the independent supply voltages to a second display region, of the plurality of display regions, configured to display the image content while the first display region undergoes the current sensing process.