Display device

Patent metadata

Field	Value
Publication number	US-2020212138-A1
Application number	US-201916536428-A
Country	US
Kind code	A1
Filing date	Aug 9, 2019
Priority date	Dec 26, 2018
Publication date	Jul 2, 2020
Grant date	—

Abstract

Provided is a display device including a light emitting device and a light receiving device. The light receiving device includes a first light receiving electrode and a light receiving layer. The light receiving device receives a second light reflected from an external object and generates current.

First claim

What is claimed is:

1 . A display device comprising:
a base substrate; and a light emitting device and a light receiving device which are disposed on the base substrate,
wherein the light emitting device comprises:
a first light emitting electrode disposed on the base substrate; and
a light emitting layer disposed on the first light emitting electrode and emitting a first light, and
wherein the light receiving device comprises:
a light receiving electrode disposed on the base substrate;
a light receiving layer disposed on the light receiving electrode,
wherein the light receiving device receives a second light reflected from an external object and generates current.

2 . The display device of claim 1 , wherein the light receiving layer comprises:
a donor material having a HOMO energy level of greater than or equal to about −6 eV to less than or equal to about −4 eV and a LOMO energy level of greater than or equal to about −3 eV to less than or equal to about −1 eV; and an acceptor material having a HOMO energy level of greater than or equal to about −7 eV to less than or equal to about −5 eV and a LUMO energy level of greater than or equal to about −4 eV to less than or equal to about −2 eV, wherein the HOMO energy level of the donor material is higher than the HOMO energy level of the acceptor material, and the LUMO energy level of the donor material is higher than the LUMO energy level of the acceptor material.

3 . The display device of claim 2 , wherein the donor material is at least one selected from among Benz[b]anthracene, 2,4-Bis[4-(N,N-dibenzylamino)-2,6-dihydroxyphenyl]squaraine, Copper (II) phthalocyanine, DBP, m-MTDATA, TDATA, 2-TNATA, NPB, TPD, TAPC, HMTPD, TCTA, PANI/DBSA, PEDOT/PSS, PANI/CSA, or PANI/PSS, and the acceptor is at least one selected from among ICBA, perylene, [5,6]-Fullerene-C 70 , BCP, Bphen, Alq 3 , BAlq, TPBi, TAZ, NTAZ, an alkali metal complex, or an alkali earth metal complex.

4 . The display device of claim 2 , wherein the light receiving layer comprises
a donor layer comprising a donor material; and an acceptor layer disposed on the donor layer and comprising an acceptor material.

5 . The display device of claim 4 , wherein the light emitting device further comprises:
a lower donor layer disposed between the first light emitting electrode and the light emitting layer and extending from the donor layer; and an upper acceptor layer disposed on the light emitting layer and extending from the acceptor layer.

6 . The display device of claim 5 , further comprising:
a hole transport region disposed between the first light emitting electrode and the lower donor layer and between the light receiving electrode and the donor layer; and an electron transport region disposed on the upper acceptor layer and the acceptor layer.

7 . The display device of claim 2 , further comprising:
a hole transport region disposed on the first light emitting electrode and the light receiving electrode; and an electron transport region disposed on the light emitting layer and the light receiving layer.

8 . The display device of claim 7 , wherein the light receiving layer is a single layer.

9 . The display device of claim 1 , further comprising:
a second electrode disposed on the light emitting layer and the light receiving layer; a thin film encapsulation layer disposed on the second electrode; and an input sensor disposed on the thin film encapsulation layer.

10 . The display device of claim 9 , wherein
the first light emitting electrode and the light receiving electrode are reflective electrodes, and the second electrode is a transparent electrode.

11 . The display device of claim 1 , wherein the external object is a finger.

12 . The display device of claim 1 , wherein the first light is a visible light having a central wavelength of greater than or equal to about 440 nm to less than or equal to about 680 nm.

13 . The display device of claim 1 , wherein the light emitting device is an organic electroluminescent device.

14 . The display device of claim 1 , wherein the light emitting device comprises:
a first light emitting device emitting a first color light; a second light emitting device emitting a second color light; and a third light emitting device emitting a third color light, wherein the first light emitting device, the second light emitting device, the third light emitting device, and the light receiving device are spaced apart from each other when viewed in a plan view.

15 . The display device of claim 14 , wherein the first light emitting device, the second light emitting device, the third light emitting device, and the light receiving device are disposed on a same plane on the base substrate.

16 . The display device of claim 14 , wherein:
the first light emitting device comprises a first sub light emitting electrode, a first light emitting layer disposed on the first sub light emitting electrode and a first auxiliary layer disposed on the first light emitting layer; the second light emitting device comprises a second sub light emitting electrode, a second light emitting layer disposed on the second sub light emitting electrode, and the second auxiliary layer disposed on the second light emitting layer; and the third light emitting device comprises a third sub light emitting electrode, a third light emitting layer disposed the third sub light emitting electrode, and the third auxiliary layer disposed on the third light emitting layer, wherein the thickness of the third auxiliary layer is thinner than the thickness of the second auxiliary layer and the thickness of the second auxiliary layer is thinner than the thickness of the first auxiliary layer.

17 . A display device, which comprises a plurality of light emitting regions and a non-light emitting region disposed between the light emitting regions, the display device comprising:
a light emitting device comprising a first light emitting electrode and a light emitting layer disposed on the first light emitting electrode; and a light receiving device comprising a first light receiving electrode and a light receiving layer disposed on the first light receiving electrode and comprising a donor material and an acceptor material, wherein: the donor material has a HOMO energy level of greater than or equal to about −6 eV to less than or equal to about −4 eV and a LUMO energy level of greater than or equal to about −3 eV to less than or equal to about −1 eV; the acceptor material has a HOMO energy level of greater than or equal to about −7 eV to less than or equal to about −5 eV and a LUMO energy level of greater than or equal to about −4 eV to less than or equal to about −2 eV; and the HOMO energy level of the donor material is higher than the HOMO energy level of the acceptor material, and the LUMO energy level of the donor material is higher than the LUMO energy level of the acceptor material.

18 . The display device of claim 17 , wherein the light receiving device receives a second light reflected from a finger and detects a change in generated current.

19 . The display device of claim 17 , wherein
each of the plurality of light emitting regions corresponds to the light emitting device, the non-light emitting region comprises a sensing region, and the light receiving device is disposed in the sensing region.

20 . A display device comprising:
a base substrate; a first light emitting electrode and a first light receiving electrode which are disposed on

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Chang-Min
• Kang Yujin
• Ko Hyomin
• Kim Daehyeon
• Lee Juwon

Classifications

• H10K85/00

  Organic materials used in the body or electrodes of devices covered by this subclass · CPC title

• H10K59/878

  comprising reflective means · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/80522

  combined with auxiliary electrodes · CPC title

• H10K59/80518

  Reflective anodes, e.g. ITO combined with thick metallic layers · CPC title