Display apparatus and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10211265-B2
Application number	US-201615372427-A
Country	US
Kind code	B2
Filing date	Dec 8, 2016
Priority date	Mar 25, 2016
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A display apparatus includes a first pixel, a second pixel, a light sensor, and a light shield. The first pixel has a first light-emitting device which includes a first emission layer that emits light in a first wavelength band in a first direction. The second pixel has a second light-emitting device which includes a second emission layer to emit light in a second wavelength band in a second direction different from the first direction. The second emission layer is below the first emission layer of the first light-emitting device. The light sensor senses light in the second wavelength band emitted from the second pixel and reflected by an object. The light shield is arranged along a light path incident to the light sensor.

First claim

What is claimed is:

1. A display apparatus, comprising:
a substrate;
a first pixel on the substrate, the first pixel including a first light-emitting diode, the first light-emitting diode including a first electrode, a second electrode, and a first emission layer between the first and second electrodes, the first emission layer to emit light in a first wavelength band, the first electrode of the first light-emitting diode to reflect the light of the first emission layer in a first direction;
a second pixel on the substrate, the second pixel including a second light-emitting diode, the second light-emitting diode including a third electrode, a fourth electrode, and a second emission layer between the third and fourth electrodes, the second emission layer to emit light in a second wavelength band, the fourth electrode of the second light-emitting diode to reflect the light of the second emission layer in a second direction opposite to the first direction, the second emission layer of the second light-emitting diode below the first emission layer of the first light-emitting diode;
a light sensor on the substrate to sense the light in the second wavelength band emitted from the second pixel and reflected by an object; and
a light shield adjacent to the light sensor on the substrate, wherein
the first electrode of the first light-emitting diode and the fourth electrode of the second light-emitting diode are adjacent to each other in a horizontal direction.

2. The display apparatus as claimed in claim 1 , wherein:
the light sensor includes a thin film transistor, and
the thin film transistor includes a third semiconductor layer.

3. The display apparatus as claimed in claim 2 , wherein the third semiconductor layer includes amorphous silicon germanium.

4. The display apparatus as claimed in claim 2 , further comprising:
an insulating layer between the light shield and the third semiconductor layer.

5. The display apparatus as claimed in claim 4 , wherein the insulating layer includes at least one of silicon nitride or silicon oxide.

6. The display apparatus as claimed in claim 1 , wherein the light shield has a stack structure including:
a first light shielding layer including amorphous germanium, and
a second light shielding layer including amorphous silicon germanium.

7. The display apparatus as claimed in claim 1 , wherein:
the first electrode of the first light-emitting diode is reflective and the second electrode of the first light-emitting diode is transparent, and
the third electrode of the second light-emitting diode is transparent and the fourth electrode of the second light-emitting diode is reflective.

8. The display apparatus as claimed in claim 1 , wherein the fourth electrode of the second light-emitting diode is on a same layer as the first electrode of the first light-emitting diode.

9. The display apparatus as claimed in claim 1 , further comprising:
an insulating layer between the fourth electrode of the second light-emitting diode and the first electrode of the first light-emitting diode.

10. The display apparatus as claimed in claim 1 , wherein:
the first pixel includes a first thin film transistor electrically connected to the first light-emitting diode and including a first semiconductor layer, and
the second pixel includes a second thin film transistor electrically connected to the second light-emitting diode and including a second semiconductor layer.

11. The display apparatus as claimed in claim 10 , wherein each of the first semiconductor layer and the second semiconductor layer includes polysilicon.

12. The display apparatus as claimed in claim 1 , wherein a resolution of the second pixel is lower than a resolution of the first pixel.

13. The display apparatus as claimed in claim 1 , wherein:
the first wavelength band includes a visible light range, and
the second wavelength band includes an infrared range.

14. A method of manufacturing a display apparatus, the method comprising:
preparing a substrate;
forming, on the substrate, a light sensor to sense light of a second wavelength band reflected by an object;
forming a second light-emitting diode, the second light-emitting diode including a third electrode, a fourth electrode, and a second emission layer between the third and fourth electrodes, the second emission layer to emit the light of the second wavelength band, the fourth electrode of the second light-emitting diode to reflect the light of the second emission layer in a direction to the substrate;
forming a first light-emitting diode, the first light-emitting diode including a first electrode, a second electrode, and a first emission layer between the first and second electrodes, the first emission layer to emit light of a first wavelength band, the first electrode of the first light-emitting diode to reflect the light of the first emission layer in a direction opposite to the substrate; and
forming a light shield in a path of light incident to the light sensor, wherein the first electrode of the first light-emitting diode and the fourth electrode of the second light-emitting diode are formed concurrently.

15. The method as claimed in claim 14 , wherein the first electrode of the first light-emitting diode and the fourth electrode of the second light-emitting diode are substantially coplanar.

16. The method as claimed in claim 14 , wherein forming the light shield includes:
before forming the light sensor, stacking a first light shielding layer and a second light shielding layer on the substrate and patterning the first light shielding layer and the second light shielding layer.

17. The method as claimed in claim 14 , wherein:
forming the light shield is performed during forming of the light sensor, and
forming the light sensor includes stacking a first light shielding layer, a second light shielding layer, an insulating layer, and a semiconductor layer on the substrate and patterning the first light shielding layer, the second light shielding layer, the insulating layer, and the semiconductor layer,
the first light shielding layer and the second light shielding layer are included in the light shield, and
the semiconductor layer is included in the light sensor.

18. The method as claimed in claim 14 , further comprising:
before forming the first light-emitting diode and the second light-emitting diode, forming a first thin film transistor electrically connected to the first light-emitting diode and a second thin film transistor electrically connected to the second light-emitting diode.

19. The method as claimed in claim 14 , wherein:
the first wavelength band includes a visible light range, and
the second wavelength band includes an IR range.

20. An apparatus, comprising:
a first pixel to emit a first light in a first wavelength band to display an image, the first pixel including a first light-emitting diode having a first electrode, a second electrode, and a first emission layer between the first and second electrodes, the first emission layer to emit the first light, the first electrode of the first light-emitting diode to reflect the first light in a first direction;
a second pixel to emit a second light in a second wavelength band to detect an object, the second pixel including a second light-emitting diode having a third electrode and a fourth electrode, and a second emission layer between the third and fourth electrodes, the second emission layer to emit the second light, the fourth electrode of the second light-emitting diode to reflect

Assignees

• Samsung Display Co Ltd

Inventors

• JEON Bogeon
• Ahn Taeyoung
• Lee Sangwook
• CHO Eunjeong

Classifications

• H01L27/3227 Primary

  Electricity · mapped topic

• A61B5/0077

  Devices for viewing the surface of the body, e.g. camera, magnifying lens · CPC title

• H01L27/3272

  Electricity · mapped topic

• A61B5/14552

  Details of sensors specially adapted therefor · CPC title

• H01L27/3248

  Electricity · mapped topic