An electronic device comprising: a cover glass; a display panel exposed through the cover glass and disposed on a first portion of a flexible substrate which is mounted in a bent form in the electronic device, wherein the display panel comprises an active area comprising at least 3 columns of sub-pixels and an inactive area surrounding the active area in which there are no sub-pixels; the flexible substrate including the first portion of the flexible substrate being connected with the display panel, a second portion of the flexible substrate disposed under the first portion, and a third portion of the flexible substrate being bent and connected between the first portion and the second portion of the flexible substrate; a display driver integrated circuit disposed on the second portion of the flexible substrate; a power line disposed on the second portion of the flexible substrate and configured to supply direct current, DC, voltage to the display driver integrated circuit; a first, second and third signal line configured to transmit a data signal from the display driver integrated circuit to a first, second and third column of sub-pixels respectively; a sensing circuit disposed on the second portion of the flexible substrate and next to the display driver integrated circuit, and comprising a first, second and third line connected to the power line, and further comprising a first, second and third transistor, wherein a drain terminal of the first, second and third transistor is connected to the first, second and third signal line respectively, and wherein a gate terminal of the first, second and third transistor is connected to the display driver integrated circuit; and a first sensing line arranged along the inactive area of the display panel and passing through the third portion of the flexible substrate such that resistance of the first sensing line increases when the inactive area of the display panel has a defect, wherein a source terminal of two of the first, second and third transistors are respectively electrically connected, within the second portion, to two of the first, second and third lines, wherein the first sensing line is arranged to electrically connect the remaining one of the first, second and third line to a source terminal of the remaining one of the first, second and third transistor via the first portion of the flexible substrate, the third portion of the flexible substrate, and the sensing circuit; wherein the display driver integrated circuit is configured to apply a signal to the gate terminal of the first, second and third transistor to switch on the first, second and third transistor such that the DC voltage is transmitted to the sub-pixels. a cover glass; a display panel exposed through the cover glass and disposed on a first portion of a flexible substrate which is mounted in a bent form in the electronic device, wherein the display panel comprises an active area comprising at least 3 columns of sub-pixels and an inactive area surrounding the active area in which there are no sub-pixels; the flexible substrate including the first portion of the flexible substrate being connected with the display panel, a second portion of the flexible substrate disposed under the first portion, and a third portion of the flexible substrate being bent and connected between the first portion and the second portion of the flexible substrate; a display driver integrated circuit disposed on the second portion of the flexible substrate; a power line disposed on the second portion of the flexible substrate and configured to supply direct current, DC, voltage to the display driver integrated circuit; a first, second and third signal line configured to transmit a data signal from the display driver integrated circuit to a first, second and third column of sub-pixels respectively; a sensing circuit disposed on the second portion of the flexible substrate and next to the display driver integrated circuit, and comprising a first, second and third line connected to the power line, and further comprising a first, second and third transistor, wherein a drain terminal of the first, second and third transistor is connected to the first, second and third signal line respectively, and wherein a gate terminal of the first, second and third transistor is connected to the display driver integrated circuit; and a first sensing line arranged along the inactive area of the display panel and passing through the third portion of the flexible substrate such that resistance of the first sensing line increases when the inactive area of the display panel has a defect, wherein a source terminal of two of the first, second and third transistors are respectively electrically connected, within the second portion, to two of the first, second and third lines, wherein the first sensing line is arranged to electrically connect the remaining one of the first, second and third line to a source terminal of the remaining one of the first, second and third transistor via the first portion of the flexible substrate, the third portion of the flexible substrate, and the sensing circuit; wherein the display driver integrated circuit is configured to apply a signal to the gate terminal of the first, second and third transistor to switch on the first, second and third transistor such that the DC voltage is transmitted to the sub-pixels.