Apple Inc.

Ki Yeol Byun

Tsung-Ting Tsai

Ting-Kuo Chang

Abbas Jamshidi Roudbari

Warren S Rieutort-Louis

Shih-Chang Chang

Shin-Hung Yeh

Keitaro Yamashita

Yu Cheng Chen

Prashant Mandlik

Zhen Zhang

Bhadrinarayana Lalgudi Visweswaran

Izhar Zahoor Ahmed

Mohammad Hajirostam

Sinan Alousi

Sungki Lee

An electronic device may have a flexible display such as an organic light-emitting diode display. A strain sensing resistor may be formed on a bent tail portion of the flexible display to gather strain measurements. Resistance measurement circuitry in a display driver integrated circuit may make resistance measurements on the strain sensing resistor and a temperature compensation resistor to measure strain. A crack detection line may be formed from an elongated pair of traces that are coupled at their ends to form a loop. The crack detection line may run along a peripheral edge of the flexible display. Crack detection circuitry may monitor the resistance of the crack detection line to detect cracks. The crack detection circuitry may include switches that adjust the length of the crack detection line and thereby allow resistances to be measured for different segments of the line.

Electronic device display with monitoring circuitry utilizing a crack detection resistor

An electronic device may include a display such as a light-emitting diode display. The electronic device may be a head-mounted device that provides a virtual reality or augmented reality environment to a user. To reduce artifacts in the display, a display may be operable in both a normal scanning mode and a partial scanning mode. In the normal scanning mode, every row of the display may be enabled to emit light in each frame. In the partial scanning mode, only a subset of the rows of the display may be enabled to emit light in each frame. The display may have a higher refresh rate in the partial scanning mode than in the normal scanning mode. To ensure uniform transistor stress across the display, the scanning driver for the display may scan the disabled rows in the partial scanning mode even though the rows will not be used to emit light.

Displays with multiple scanning modes

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Santa Clara, CA, United States of America

Ki Yeol Byun