Electronic device display with monitoring circuitry

US10643511B2 · kind B2 · utility

Assignee

• Apple Inc. · US

Inventors

• Rui Zhang · Santa Clara, US
• Mohammad Hajirostam · San Jose, US
• Hung Sheng Lin · San Jose, US
• Mohammad B. Vahid Far · San Jose, US
• Sang Y. Youn · Cupertino, US
• Zhen Zhang · Cupertino, US
• Prashant Mandlik · Lawrenceville, US
• Sun-Il Chang · San Jose, US
• Jie Won Ryu · Santa Clara, US
• Shengkui Gao · Shoreline, US
• Hyunwoo Nho · Palo Alto, US
• Wei H. Yao · Palo Alto, US
• Yafei Bi · Los Altos Hills, US
• Yun Wang · Cupertino, US

Key dates

• Filing date: Sep 23, 2016
• Grant date: May 5, 2020
• Expiry date: Apr 15, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/50
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

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.