Display apparatus

Patent metadata

Field	Value
Publication number	US-12475734-B2
Application number	US-202118034787-A
Country	US
Kind code	B2
Filing date	May 21, 2021
Priority date	Nov 2, 2020
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A display apparatus according to an embodiment of the present disclosure includes: a panel which includes a light emitting area and at least one non-light emitting area; a light emitting device which is disposed in the light emitting area and includes a first electrode, a light emitting stack, and a second electrode; a light converter which partitions an opening of the light emitting area and includes a light conversion material; and a capping layer disposed on the second electrode. The light converter includes a light conversion layer and a light amplifier.

First claim

What is claimed is:

1 . A display apparatus comprising:
a panel which comprises a light emitting area and at least one non-light emitting area; a light emitting device which is disposed in the light emitting area and comprises a first electrode, a light emitting stack, and a second electrode; a light converter which partitions an opening of the light emitting area and comprises a light conversion material; and a capping layer disposed on the second electrode, a light receiver disposed near the light converter; wherein the light converter comprises a light conversion layer and a light amplifier and the light receiver comprises a light absorption layer; wherein a thickness from a top of the light amplifier to a bottom of the second electrode or to a bottom of the capping layer and a thickness from a top of the light absorption layer to the bottom of the second electrode or to the bottom of the capping layer is in a range of 1.275 μm to 6.375 μm so that constructive interference occurs.

2 . The display apparatus of claim 1 , wherein the light conversion layer covers an edge of the first electrode, and the light emitting stack and the second electrode are disposed on the light conversion layer in such a manner as to overlap each other.

3 . The display apparatus of claim 1 , further comprising a planarization layer between the light conversion layer and the light amplifier, wherein the light conversion layer is disposed on the light amplifier and then they overlap each other.

4 . The display apparatus of claim 2 , wherein the light conversion material is a material that absorbs light in a visible light region and emits light in a near-infrared region.

5 . The display apparatus of claim 4 , wherein the near-infrared has a wavelength of 780 nm to 990 nm.

6 . The display apparatus of claim 1 , wherein the light receiver does not overlap at least one of the light conversion layer, the planarization layer, and the light amplifier.

7 . The display apparatus of claim 1 , wherein the light receiver further comprises a reflective electrode.

8 . The display apparatus of claim 4 ,
wherein the second electrode and the capping layer extend over the light conversion layer, and wherein a part of the light the near-infrared region emitted from the light conversion layer is reflected from an interface between the second electrode and the capping layer, so that the constructive interference occurs.

9 . A display apparatus comprising:
a substrate: a transistor disposed on the substrate; an organic light emitting diode disposed on the transistor; a capping layer disposed on the organic light emitting diode; an encapsulation part disposed on the capping layer; a cover glass disposed on the encapsulation part; and a near-infrared converter which is disposed in the form of matrix and partitions an opening, a near-infrared light receiver disposed adjacent to the near-infrared converter; wherein the organic light emitting diode comprises a first electrode, a light emitting stack, and a second electrode, and wherein the near-infrared converter comprises a light conversion layer and a light amplifier, the near-infrared light receiver comprises a light absorption layer and the capping layer extends to a top of the light conversion layer, wherein a thickness from a top of the light amplifier to a bottom of the second electrode or to a bottom of the capping layer and a thickness from a top of the light absorption layer to the bottom of the second electrode or to the bottom of the capping layer is in a range of 1.275 μm to 6.375 μm so that constructive interference occurs.

10 . The display apparatus of claim 9 , wherein the light conversion layer comprises a light conversion material, and wherein the light conversion material absorbs light in a visible light region and emits light in a near-infrared region.

11 . The display apparatus of claim 10 , wherein the light in a near-infrared region emitted from the light conversion layer is reflected from a top surface of the light amplifier.

12 . The display apparatus of claim 11 , wherein a part of the light in a near-infrared region reflected from a bottom surface of the capping layer disposed on the light conversion layer meets the light in a near-infrared region reflected from the top surface of the light amplifier, so that the constructive interference occurs.

13 . The display apparatus of claim 1 , wherein the transistor comprises a semiconductor layer, a gate electrode, a source electrode, and a drain electrode, and wherein the near-infrared light receiver further comprises a transparent electrode, and a reflective electrode.

14 . The display apparatus of claim 13 , wherein the near-infrared reflected from an object outside the cover glass is incident on the light absorption layer of the near-infrared light receiver, and a change in current of the light absorption layer is detected.

15 . The display apparatus of claim 13 , wherein the capping layer extends to a top surface of the near-infrared light receiver, wherein a part of the near-infrared is reflected from the light absorption layer, and the part of the near-infrared reflected from the light absorption layer is reflected from a bottom surface of the capping layer, so that the constructive interference occurs.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Wonrae
• Lee Seungbum
• Kim Younghoon
• Yang Yoonsik
• You Seungcheol

Classifications

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/8731

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K59/38

  comprising colour filters or colour changing media [CCM] · CPC title

• H10K59/65 Primary

  OLEDs integrated with inorganic image sensors · CPC title

• H10K59/40

  OLEDs integrated with touch screens · CPC title