Electronic device comprising flexible substrate structure having portions with different poisson ratios
The present disclosure provides an electronic device including a covering layer and a flexible substrate structure. The covering layer includes a first region and a second region. The flexible substrate structure is disposed under the covering layer and includes a first portion corresponding to the first region and a second portion corresponding to the second region. A Gaussian curvature of the first region of the covering layer is different from a Gaussian curvature of the second region of the covering layer, and a Poisson's ratio of the first portion of the flexible substrate structure is different from a Poisson's ratio of the second portion of the flexible substrate structure.
1 . An electronic device, comprising:
a covering layer comprising a first region and a second region; and
a flexible substrate structure disposed under the covering layer and comprising a first portion corresponding to the first region and a second portion corresponding to the second region,
wherein an absolute value of a Gaussian curvature of the first region of the covering layer is less than an absolute value of a Gaussian curvature of the second region of the covering layer, and a Poisson's ratio of the first portion of the flexible substrate structure is greater than zero and a Poisson's ratio of the second portion of the flexible substrate structure is less than zero.
2 . The electronic device as claimed in claim 1 , wherein the first portion of the flexible substrate structure comprises a first substrate, the second portion of the flexible substrate structure comprises a second substrate, and the first substrate is different from the second substrate in material.
3 . The electronic device as claimed in claim 2 , wherein a Poisson's ratio of the first substrate is greater than a Poisson's ratio of the second substrate.
4 . The electronic device as claimed in claim 3 , wherein the Poisson's ratio of the first substrate is greater than zero and the Poisson's ratio of the second substrate is less than zero.
5 . The electronic device as claimed in claim 1 , wherein the first portion of the flexible substrate structure comprises a first substrate, the second portion of the flexible substrate structure comprises a second substrate, and the second substrate comprises a plurality of openings and a plurality of segments, each opening is disposed between two adjacent ones of the plurality of segments, and one end of one of the two adjacent ones of the plurality of segments is connected to one end of another one of the two adjacent ones of the plurality of segments.
6 . The electronic device as claimed in claim 1 , wherein the first portion of the flexible substrate structure comprises a first substrate having a plurality of first openings, the second portion of the flexible substrate structure comprises a second substrate having a plurality of second openings, and the plurality of first openings are less than the plurality of second openings in density.
7 . The electronic device as claimed in claim 1 , wherein the Gaussian curvature of the first region of the covering layer is greater than zero, the Gaussian curvature of the second region of the covering layer is less than zero, the first portion of the flexible substrate structure comprises a first substrate having a plurality of first openings, the second portion of the flexible substrate structure comprises a second substrate having a plurality of second openings, and one of the plurality of first openings is less than one of the plurality of second openings in area.
8 . The electronic device as claimed in claim 1 , wherein the second portion is at a corner of the flexible substrate structure.
9 . The electronic device as claimed in claim 1 , wherein the second portion is at a center of the flexible substrate structure.