A display apparatus , comprising: a base layer having a first portion, a second portion, and a bend allowance section between the first portion and the second portion of the display apparatus ; an array of pixel circuits and a driving circuit on the base layer ; a plurality of conductive line traces connected to the array of pixel circuits and/or the driving circuit, wherein at least one of the plurality of conductive line traces includes a strain-reducing trace design portion, wherein the strain-reducing trace design portion is disposed on the base layer in a region of the base layer corresponding to the bend allowance section of the display apparatus ; and one or more inorganic insulation layers disposed under and/or on the at least one conductive line trace , wherein the one or more inorganic insulation layers is patterned around the strain-reducing trace design portion of the at least one conductive line trace , wherein the at least one conductive line trace splits into a first sub-trace and a second sub-trace which are connected to each other at one end of the conductive line trace , wherein the strain-reducing trace design portion includes the first sub-trace and the second sub-trace and an elongated recessed channel between the first sub-trace and the second sub-trace, which channel is formed by patterning the inorganic insulating layers around the split sub-traces, wherein each of the first sub-trace and the second sub-trace includes a grid-like trace design, wherein the grid-like trace design includes a plurality of diamond-chain shaped traces that are arranged side-by-side and in contact with each other, wherein each diamond-chain shaped trace includes a series of diamond-shaped link traces, wherein the elongated recessed channel extends in a direction parallel to the bending direction of the bend allowance section of the display apparatus , wherein the bending direction is the tangent vector of the curvature. a base layer having a first portion, a second portion, and a bend allowance section between the first portion and the second portion of the display apparatus ; an array of pixel circuits and a driving circuit on the base layer ; a plurality of conductive line traces connected to the array of pixel circuits and/or the driving circuit, wherein at least one of the plurality of conductive line traces includes a strain-reducing trace design portion, wherein the strain-reducing trace design portion is disposed on the base layer in a region of the base layer corresponding to the bend allowance section of the display apparatus ; and one or more inorganic insulation layers disposed under and/or on the at least one conductive line trace , wherein the one or more inorganic insulation layers is patterned around the strain-reducing trace design portion of the at least one conductive line trace , wherein the at least one conductive line trace splits into a first sub-trace and a second sub-trace which are connected to each other at one end of the conductive line trace , wherein the strain-reducing trace design portion includes the first sub-trace and the second sub-trace and an elongated recessed channel between the first sub-trace and the second sub-trace, which channel is formed by patterning the inorganic insulating layers around the split sub-traces, wherein each of the first sub-trace and the second sub-trace includes a grid-like trace design, wherein the grid-like trace design includes a plurality of diamond-chain shaped traces that are arranged side-by-side and in contact with each other, wherein each diamond-chain shaped trace includes a series of diamond-shaped link traces, wherein the elongated recessed channel extends in a direction parallel to the bending direction of the bend allowance section of the display apparatus , wherein the bending direction is the tangent vector of the curvature. <EOS>