Stretchable strain sensor, combination sensor, and display panel and device
A stretchable strain sensor includes a light-emitting element, an optical structure, and a photo-detective element. The stretchable strain sensor is located in a path of light emitted from the light-emitting element. The optical structure is configured to have optical properties that change in response to stretching of at least a portion of the stretchable strain sensor. The photo-detective element is configured to detect light transmitted through the optical structure or reflected through the optical structure.
1. A combination sensor, comprising:
a bio-signal sensor configured to detect a bio-signal;
a stretchable strain sensor configured to detect a strain caused based on stretching of at least a portion of the stretchable strain sensor; and
a light-emitting element configured to supply light to the bio-signal sensor and the stretchable strain sensor,
wherein the bio-signal sensor includes a first photo-detective element configured to detect reflected light wherein light supplied from the light-emitting element is reflected by an object of a living body,
wherein the stretchable strain sensor includes
an optical structure disposed in a path of light irradiated from the light-emitting element, the optical structure configured to have optical properties that change in response to stretching of at least the portion of the stretchable strain sensor, and
a second photo-detective element configured to detect light transmitted through the optical structure or reflected by the optical structure.
2. The combination sensor of claim 1 , wherein
the light-emitting element is between the first photo-detective element and the second photo-detective element.
3. The combination sensor of claim 1 , further comprising:
a stretchable light-transmitting layer that supports the bio-signal sensor, the stretchable strain sensor, and the light-emitting element,
wherein the optical properties of the optical structure change in response to stretching of the stretchable light-transmitting layer.
4. The combination sensor of claim 3 , wherein
the stretchable light-transmitting layer includes
a plurality of rigid regions having a first elastic modulus, and
a soft region between adjacent rigid regions of the plurality of rigid regions, the soft region having a second elastic modulus that is lower than the first elastic modulus,
the light-emitting element and the first photo-detective element are in at least one rigid region of the plurality of rigid regions, and
the optical structure is in the soft region.
5. The combination sensor of claim 4 , wherein the second photo-detective element is in the at least one rigid region or the soft region.