Bio imaging systems and bio imaging methods

1 . A bio imaging system, comprising:

a stretchable substrate;

a plurality of light emitters on the stretchable substrate, each light emitter of the plurality of light emitters being configured to irradiate light; and

a plurality of sensors on the stretchable substrate, each sensor of the plurality of sensors being configured to detect light scattered or reflected by internal tissue of a living body,

wherein each sensor of the plurality of sensors includes a plurality of photo-detecting elements overlapped in a thickness direction of the stretchable substrate and having different absorption peak wavelengths in relation to each other,

wherein each emission spectrum of each light emitter of the plurality of light emitters includes all of respective absorption spectra of the plurality of photo-detecting elements, and

wherein the bio imaging system further includes processing circuitry configured to obtain electrical signals from the plurality of photo-detecting elements and to generate a three-dimensional image of the internal tissue of the living body based on combining a plurality of depth images according to the electrical signals obtained from the plurality of photo-detecting elements,

wherein the stretchable substrate comprises a plurality of first regions having a first elastic modulus and a second region between adjacent first regions of the plurality of first regions, the second region having a second elastic modulus, the first elastic modulus being higher than the second elastic modulus,

wherein the plurality of light emitters and the plurality of sensors are on separate, respective first regions of the plurality of first regions of the stretchable substrate, such that each separate first region is overlapped in the thickness direction of the stretchable substrate with one of:

a separate sensor of the plurality of sensors, or

a separate light emitter of the plurality of light emitters,

wherein each sensor of the plurality of sensors includes a first photo-detecting element and a second photo-detecting element overlapped in the thickness direction, wherein:

the first photo-detecting element includes a first absorption layer and a first electrode, the first absorption layer configured to selectively detect light in a first absorption spectrum having a first absorption peak wavelength, and

the second photo-detecting element includes a second absorption layer and a second electrode, the second absorption layer configured to selectively detect light in a second absorption spectrum having a second absorption peak wavelength, the second absorption peak wavelength being longer than the first absorption peak wavelength,

the first electrode and the second electrode are overlapped with each other in the thickness direction,

the first absorption layer and the second absorption layer are both overlapped between the first electrode and the second electrode in the thickness direction, and

each sensor further includes a third electrode, the third electrode is a common electrode of the first photo-detecting element and the second photo-detecting element of the sensor, the third electrode is overlapped between the first electrode and the second electrode of the sensor in the thickness direction, the third electrode further overlapped between the first absorption layer and the second absorption layer of the sensor in the thickness direction.

2 . The bio imaging system of claim 1 , wherein each absorption peak wavelength of the plurality of photo-detecting elements is within a visible wavelength spectrum and an infrared wavelength spectrum.

3 . The bio imaging system of claim 2 , wherein each absorption peak wavelength of the plurality of photo-detecting elements is within 450±45 nm to 1200±120 nm.

4 . The bio imaging system of claim 3 , wherein a difference between absorption peak wavelengths of the plurality of photo-detecting elements is greater than or equal to 10±1 nm.

5 . The bio imaging system of claim 1 , wherein the plurality of light emitters are configured to emit light of same emission spectrum as each other.

6 . The bio imaging system of claim 1 , wherein the bio imaging system comprises

a light emitter-sensor array in which the plurality of light emitters and the plurality of sensors are alternately arranged.

7 . The bio imaging system of claim 1 , further comprising:

an encapsulation film covering the plurality of the light emitters and the plurality of sensors.

8 . The bio imaging system of claim 1 , further comprising:

a display panel.

9 . A bio imaging method, comprising:

fixing the bio imaging system of claim 1 on skin of the living body,

activating the plurality of light emitters of the bio imaging system to irradiate light to the skin of the living body, and

selectively sensing light scattered or reflected by the internal tissue of the living body through the skin of the living body in each photo-detecting element of the plurality of photo-detecting elements of at least one sensor of the plurality of sensors of the bio imaging system according to a wavelength spectrum of the light scattered and reflected to obtain a plurality of images.

10 . The bio imaging method of claim 9 , further comprising:

extracting differences between the plurality of images to obtain the plurality of depth images of the internal tissue of the living body according to depth from a surface of the skin.

11 . The bio imaging method of claim 10 , further comprising:

combining the plurality of depth images of the internal tissue of the living body to generate the three-dimensional image of the internal tissue of the living body.

12 . The bio imaging method of claim 9 , wherein the internal tissue of the living body includes a blood vessel.

13 . A bio imaging system, comprising:

a stretchable substrate;

a plurality of light emitters on the stretchable substrate, each light emitter of the plurality of light emitters being configured to irradiate light; and

a plurality of sensors on the stretchable substrate, each sensor of the plurality of sensors being configured to detect light scattered or reflected by internal tissue of a living body,

wherein each sensor of the plurality of sensors includes a plurality of photo-detecting elements overlapped in a thickness direction of the stretchable substrate and having different absorption peak wavelengths in relation to each other,

wherein each emission spectrum of each light emitter of the plurality of light emitters includes all of respective absorption spectra of the plurality of photo-detecting elements, and

wherein the bio imaging system further includes processing circuitry configured to obtain electrical signals from the plurality of photo-detecting elements and to generate a three-dimensional image of the internal tissue of the living body based on combining a plurality of depth images according to the electrical signals obtained from the plurality of photo-detecting elements,

wherein the stretchable substrate comprises a plurality of first regions having a first elastic modulus and a second region between adjacent first regions of the plurality of first regions, the second region having a second elastic modulus, the first elastic modulus being higher than the second elastic modulus,

wherein the plurality of light emitters and the plurality of sensors are on separate, respective first regions of the plurality of first regions of the stretchable substrate, such that each separate first region is overlapped in the thickness direction of the stretchable substrate with one of:

a separate sensor of the plurality of sensors, or

a separate light emitter of the plurality of light emitters,

wherein each sensor of the plurality of sensors includes:

a first photo-detecting element including a first absorption layer overlapped between a first electrode and a second electrode in the thickness direction, the first absorption layer configured to selectively detect light in a first absorption spectrum having a first absorption peak wavelength,

a second photo-detecting element stacked on the first photo-detecting element in the thickness direction, the second photo-detecting element including a second absorption layer overlapped between a third electrode and a fourth electrode in the thickness direction, the second absorption layer configured to selectively detect light in a second absorption spectrum having a second absorption peak wavelength, the second absorption peak wavelength being longer than the first absorption peak wavelength,

a third photo-detecting element stacked on the second photo-detecting element in the thickness direction such that the second photo-detecting element is overlapped between the first photo-detecting element and the third photo-detecting element in the thickness direction, the third photo-detecting element including a third absorption layer overlapped between a fifth electrode and a sixth electrode in the thickness direction, the third absorption layer configured to detect light in a third absorption spectrum having a third absorption peak wavelength, the third absorption peak wavelength being longer than the second absorption peak wavelength, and

a plurality of insulating layers, the plurality of insulating layers including:

a first insulating layer overlapped between the first photo-detecting element and the second photo-detecting element in the thickness direction, and

a second insulating layer overlapped between the second photo-detecting element and the third photo-detecting element in the thickness direction.

14 . The bio imaging system of claim 13 , wherein each absorption peak wavelength of the plurality of photo-detecting elements is within a visible wavelength spectrum and an infrared wavelength spectrum.

15 . The bio imaging system of claim 14 , wherein each absorption peak wavelength of the plurality of photo-detecting elements is within 450±45 nm to 1200±120 nm.

16 . The bio imaging system of claim 13 , wherein the plurality of light emitters are configured to emit light of same emission spectrum as each other.

17 . The bio imaging system of claim 13 , wherein the bio imaging system further comprising:

a light emitter-sensor array in which the plurality of light emitters and the plurality of sensors are alternately arranged.

18 . The bio imaging system of claim 13 , further comprising:

an encapsulation film covering the plurality of the light emitters and the plurality of sensors.

19 . The bio imaging system of claim 13 , further comprising:

a display panel.

20 . A bio imaging method, comprising:

fixing the bio imaging system of claim 7 on skin of the living body,

activating the plurality of light emitters of the bio imaging system to irradiate light to the skin of the living body,

selectively sensing light scattered or reflected by the internal tissue of the living body through the skin of the living body in each photo-detecting element of the plurality of photo-detecting elements of at least one sensor of the plurality of sensors of the bio imaging system according to a wavelength spectrum of the light scattered and reflected to obtain a plurality of images, and

extracting differences between the plurality of images to obtain the plurality of depth images of the internal tissue of the living body according to depth from a surface of the skin,

wherein the obtaining of the plurality of depth images of the internal tissue of the living body according to the depth from the surface of the skin includes:

extracting a first depth image of the internal tissue of the living body at a first depth from the surface of the skin, from a first difference between a first image obtained by the first photo-detecting element and a second image obtained by the second photo-detecting element, and

extracting a second depth image of the internal tissue of the living body at a second depth that is deeper than the first depth, from a second difference between a third image obtained by the third photo-detecting element and the second image obtained by the second photo-detecting element.