Display device and tiled display device including the same

Patent metadata

Field	Value
Publication number	US-2024429219-A1
Application number	US-202418657654-A
Country	US
Kind code	A1
Filing date	May 7, 2024
Priority date	Jun 22, 2023
Publication date	Dec 26, 2024
Grant date	—

Abstract

A tiled display device includes a display device. The display device including a substrate, a plurality of transistors on one surface of the substrate, a plurality of light emitting elements on the plurality of transistors, a plurality of bottom wirings on a rear surface of the substrate, and a first selective reflective film between the substrate and the plurality of bottom wirings. The first selective reflective film includes M pairs of first layers and second layers, where M is an integer greater than or equal to 2. A refractive index of the first layer is higher than a refractive index of the second layer.

First claim

What is claimed is:

1 . A display device comprising:
a substrate; a plurality of transistors on one surface of the substrate; a plurality of light emitting elements on the plurality of transistors; a plurality of bottom wirings on a rear surface of the substrate; and a first selective reflective film between the substrate and the plurality of bottom wirings, wherein the first selective reflective film comprises M pairs of first layers and second layers, where M is an integer greater than or equal to 2, and wherein a refractive index of the first layer is higher than a refractive index of the second layer.

2 . The display device of claim 1 , wherein a reflective target wavelength of the first selective reflective film is 310 nm or less.

3 . The display device of claim 1 , wherein a difference between a refractive index of the first layer and a refractive index of the second layer is 0.55 or more.

4 . The display device of claim 1 , wherein the first layer comprises TiO 2 , and the second layer comprises SiO 2 or HfO 2 .

5 . The display device of claim 1 , wherein the first layer comprises Si 3 N 4 and the second layer comprises SiO 2 .

6 . The display device of claim 1 , wherein a thickness of the first layer is smaller than a thickness of the second layer.

7 . The display device of claim 1 , further comprising a second selective reflective film between the substrate and the plurality of transistors,
wherein the second selective reflective film comprises N pairs of a third layer and a fourth layer, where N is an integer greater than or equal to 2, and wherein a refractive index of the third layer is higher than a refractive index of the fourth layer.

8 . The display device of claim 7 , wherein a reflective target wavelength of the second selective reflective film is 310 nm or less.

9 . The display device of claim 7 , wherein a reflective target wavelength of the first selective reflective film is substantially the same as a reflective target wavelength of the second selective reflective film.

10 . The display device of claim 7 , wherein a reflective target wavelength of the second selective reflective film is smaller than a reflective target wavelength of the first selective reflective film.

11 . The display device of claim 10 , wherein a thickness of the second selective reflective film is smaller than a thickness of the first selective reflective film.

12 . The display device of claim 1 , further comprising a second selective reflective film between the substrate and the plurality of transistors,
wherein the second selective reflective film comprises N pairs of a third layer and a fourth layer, where N is an integer greater than or equal to 2, and wherein a refractive index of the third layer is higher than a refractive index of the fourth layer.

13 . The display device of claim 12 , wherein a reflective target wavelength of the second selective reflective film is greater than a reflective target wavelength of the first selective reflective film.

14 . The display device of claim 13 , wherein a thickness of the second selective reflective film is greater than a thickness of the first selective reflective film.

15 . The display device of claim 13 , wherein a thickness of the third layer is greater than a thickness of the first layer, and a thickness of the fourth layer is greater than a thickness of the third layer.

16 . The display device of claim 1 , further comprising data lines on the one surface of the substrate;
power supply lines on the one surface of the substrate; and side wirings on a side surface of the substrate, connected to one or more of the bottom wirings and the data lines, and connected to one or more of the bottom wirings and the power supply lines.

17 . The display device of claim 1 , further comprising a device identifier on the rear surface of the substrate and separated from the bottom wirings.

18 . A display device comprising:
a substrate; a plurality of first transistors of a first sub-pixel and a plurality of second transistors of a second sub-pixel on one surface of the substrate; a first light emitting element on the plurality of first transistors of the first sub-pixel and a second light emitting element on the plurality of second transistors of the second sub-pixel; a plurality of bottom wirings on a rear surface of the substrate; and a first selective reflective film between the substrate and the plurality of bottom wirings, wherein the first selective reflective film comprises: a first reflective film overlapping the plurality of first transistors of the first sub-pixel in a thickness direction of the substrate; and a second reflective film overlapping the plurality of second transistors of the second sub-pixel in the thickness direction of the substrate, wherein the first reflective film and the second reflective film are spaced from each other.

19 . The display device of claim 18 , wherein each of the first reflective film and the second reflective film comprises M pairs of first layers and second layers, where M is an integer greater than or equal to 2), and
wherein a refractive index of the first layer is higher than a refractive index of the second layer.

20 . A tiled display device comprising:
a plurality of display devices; and a connection member between the plurality of display devices, wherein one display device from among the plurality of display devices comprises: a substrate; a plurality of transistors on one surface of the substrate; a plurality of light emitting elements on the plurality of transistors; a plurality of bottom wirings on a rear surface of the substrate; and a first selective reflective film between the substrate and the plurality of bottom wirings, wherein the first selective reflective film comprises M pairs of first layers and second layers, where M is an integer greater than or equal to 2, and wherein a refractive index of the first layer is higher than a refractive index of the second layer.

Assignees

• Samsung Display Co Ltd

Inventors

• Son Kyung Rock
• Yang Hui Won
• Lee Gwang Geun

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• H10D86/441

  Interconnections, e.g. scanning lines · CPC title

• G09F9/33

  being semiconductor devices, e.g. diodes · CPC title

• H10H20/856

  Reflecting means · CPC title