Electronic device display with monitoring circuitry
First Claim
1. A display system, comprising:
- a flexible display having an array of pixels;
a display driver integrated circuit that supplies data to columns of the pixels over data lines;
gate driver circuitry that supplies control signals to rows of the pixels over gate lines, wherein the gate driver circuitry includes a plurality of switches;
a crack detection resistor that runs along a peripheral edge of the flexible display, wherein the crack detection resistor has first and second parallel lines that are coupled to form a loop and wherein each of the switches couples the first parallel line to the second parallel line at a different respective location along the first and second parallel lines;
resistance measurement circuitry in the display driver integrated circuit that is configured to make resistance measurements on the crack detection resistor, wherein the resistance measurement circuitry is configured to process the resistance measurements to determine whether there are cracks in the crack detection line; and
a flexible printed circuit that is coupled to the flexible display, wherein the display driver integrated circuit is mounted to the flexible printed circuit.
1 Assignment
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Accused Products
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.
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Citations
11 Claims
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1. A display system, comprising:
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a flexible display having an array of pixels; a display driver integrated circuit that supplies data to columns of the pixels over data lines; gate driver circuitry that supplies control signals to rows of the pixels over gate lines, wherein the gate driver circuitry includes a plurality of switches; a crack detection resistor that runs along a peripheral edge of the flexible display, wherein the crack detection resistor has first and second parallel lines that are coupled to form a loop and wherein each of the switches couples the first parallel line to the second parallel line at a different respective location along the first and second parallel lines; resistance measurement circuitry in the display driver integrated circuit that is configured to make resistance measurements on the crack detection resistor, wherein the resistance measurement circuitry is configured to process the resistance measurements to determine whether there are cracks in the crack detection line; and a flexible printed circuit that is coupled to the flexible display, wherein the display driver integrated circuit is mounted to the flexible printed circuit. - View Dependent Claims (2, 3)
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4. A display system, comprising:
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a flexible display having an array of pixels; a display driver integrated circuit that supplies data to columns of the pixels over data lines; gate driver circuitry that supplies control signals to rows of the pixels over gate lines; a crack detection line that runs along a peripheral edge of the flexible display; and resistance measurement circuitry in the display driver integrated circuit that measures the resistance on the crack detection line and processes the measured resistance to detect cracks in the crack detection line, wherein the resistance measurement circuitry comprises; an integrator; at least one reference resistor; at least one selection switch configured to cause current from a selected one of the reference resistor and the crack detection line to pass to the integrator; a comparator that compares output signals from the integrator to a reference voltage; a counter; and control logic configured to obtain a count value from the counter in response to detection of a change in state of an output of the comparator. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A display system, comprising:
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a display having pixels; gate driver circuitry that supplies control signals to the pixels; a crack detection line that forms a loop running along a peripheral edge of the display, wherein the crack detection line comprises first and second parallel traces that run along the peripheral edge of the display and that have ends that are coupled by a connection path; a display driver integrated circuit that supplies data to the pixels over data lines and that includes resistance measurement circuitry that measures a resistance on the crack detection line and processes the measured resistance to determine a position of a crack in the crack detection line; and switches in the gate driver circuitry that are coupled to the crack detection line wherein each of the switches is coupled between the first and second parallel traces at a different respective location along the first and second parallel traces. - View Dependent Claims (11)
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Specification