Micro-light emitting diode display and methods of manufacturing and operating the same

Patent metadata

Field	Value
Publication number	US-2024072014-A1
Application number	US-202318106855-A
Country	US
Kind code	A1
Filing date	Feb 7, 2023
Priority date	Aug 23, 2022
Publication date	Feb 29, 2024
Grant date	—

Abstract

An ultra-high pixel per inch (ppi) micro-light-emitting diode (LED) display includes a micro-LED layer including a plurality of micro-LEDs, a backplane layer including a switching device connected to the micro-LED layer, and a field shielding member provided between the plurality of micro-LEDs and the switching device, the field shielding member configured to shield the switching device from a field applied to the switching device from the plurality of micro-LEDs during an operation of the micro-LED display, where the micro-LED layer and the backplane layer form a single body in a sequentially stacked structure.

First claim

What is claimed is:

1 . An ultra-high pixel per inch (ppi) micro-light-emitting diode (LED) display comprising:
a micro-LED layer comprising a plurality of micro-LEDs; and a backplane layer comprising a switching device connected to the micro-LED layer, and a field shielding member provided between the plurality of micro-LEDs and the switching device, the field shielding member configured to shield the switching device from a field applied to the switching device from the plurality of micro-LEDs during an operation of the micro-LED display, wherein the micro-LED layer and the backplane layer form a single body in a sequentially stacked structure.

2 . The micro-LED display of claim 1 , wherein the field shielding member comprises
a reflective layer configured to reflect light emitted from the plurality of micro-LEDs; and a metal layer provided as a contact terminal and configured to apply a voltage to the reflective layer.

3 . The micro-LED display of claim 2 , wherein the plurality of micro-LEDs comprises:
at least one active micro-LED; and an inactive dummy micro-LED.

4 . The micro-LED display of claim 3 , wherein the reflective layer is provided on a surface of the at least one active micro-LED facing the switching device,
wherein the reflective layer does not electrically contact the at least one active micro-LED, and wherein the metal layer is provided on the inactive dummy micro-LED.

5 . The micro-LED display of claim 4 , further comprising a current blocking layer provided on at least a side surface of the at least one active micro-LED and between the reflective layer and the at least one active micro-LED.

6 . The micro-LED display of claim 1 , wherein the switching device comprises a channel layer,
wherein the field shielding member is connected to a first side of the channel layer, and wherein the micro-LED layer is connected to a second side of the channel layer that is different from the first side of the channel layer.

7 . The micro-LED display of claim 6 , wherein the entire channel layer is provided on the field shielding member.

8 . The micro-LED display of claim 7 , wherein the field shielding member comprises a metal layer.

9 . The micro-LED display of claim 8 , further comprising a reflective layer contacting the plurality of micro-LEDs,
wherein the reflective layer is between the plurality of micro-LEDs and the switching device, and wherein the reflective layer is connected to the channel layer through the metal layer.

10 . The micro-LED display of claim 1 , wherein the switching device comprises a plurality of switching devices, and
wherein the field shielding member comprises:
a single metal layer corresponding to the plurality of switching devices and separated from the plurality of micro-LEDs; and
a metal layer provided as a contact terminal and configured to apply a voltage to the single metal layer.

11 . The micro-LED display of claim 10 , wherein the switching device comprises a channel layer, and
wherein the micro-LED is connected to one side of the channel layer.

12 . The micro-LED display of claim 11 , wherein a reflective layer is provided between the switching device and the plurality of micro-LEDs, and
wherein the plurality of micro-LEDs is connected to the channel layer through the reflective layer.

13 . A method of manufacturing an ultra-high pixel per inch (ppi)micro-light-emitting diode (LED) display, the method comprising:
forming a plurality of micro-LEDs on a substrate; forming a reflective layer on the plurality of micro-LEDs; forming an interlayer insulating layer on the reflective layer; forming a switching device on the interlayer insulating layer; and connecting the switching device to the plurality of micro-LEDs, wherein the plurality of micro-LEDs comprises:
a plurality of active micro-LEDs, and
an inactive micro-LED,
wherein the switching device is connected to the plurality of active micro-LEDs, wherein the reflective layer does not directly contact the plurality of micro-LEDs, and wherein a metal layer as a voltage applying terminal is formed on the reflective layer and on the inactive micro-LED.

14 . The method of claim 13 , further comprising forming a current blocking layer between the reflective layer and the plurality of micro-LEDs.

15 . A method of manufacturing an ultra-high pixel per inch (ppi)micro-light-emitting diode (LED) display, the method comprising:
forming a micro-LED on a substrate; forming a reflective layer on the micro-LED, the reflective layer contacting the micro-LED; forming an interlayer insulating layer on the reflective layer; forming a field shielding member on the interlayer insulating layer; forming a buffer layer on the field shielding member, the field shielding member being provided on the interlayer insulating layer; forming a switching device on the buffer layer; and connecting a first side of the switching device to the field shielding member and a second side of the switching device to the micro-LED.

16 . The method of claim 15 , wherein the switching device comprises a channel layer connected to the field shielding member and the micro-LED,
wherein the field shielding member comprises a metal layer, and wherein the entire channel layer is on the metal layer.

17 . A method of manufacturing an ultra-high pixel per inch (ppi)micro-light-emitting diode (LED) display, the method comprising:
forming a micro-LED on a substrate; forming a reflective layer on the micro-LED, the reflective layer contacting the micro-LED; forming an interlayer insulating layer on the reflective layer; forming a field shielding member on the interlayer insulating layer; forming a buffer layer on the field shielding member, the field shielding member being provided on the interlayer insulating layer; forming a switching device on the buffer layer; and connecting the switching device to the micro-LED, wherein the field shielding member comprises:
a metal layer that does not directly contact the switching device and the micro-LED; and
a voltage applying terminal connected to the metal layer.

18 . A method of operating an ultra-high pixel per inch (ppi)micro-light-emitting diode (LED) display comprising a micro-LED and a switching device connected to the micro-LED, the method comprising:
shielding the switching device from a field applied to the switching device from the micro-LED during an operation of the micro-LED display by applying, to a field shielding member, a bias voltage, wherein the field shielding member is between the micro-LED and the switching device, and wherein the field shielding member is electrically insulated from the micro-LED.

19 . The method of claim 18 , wherein the switching device comprises a channel layer,
wherein the field shielding member is connected to one side of the channel layer, and wherein the bias voltage is supplied to the field shielding member through the switching device.

20 . The method of claim 18 , wherein the bias voltage is directly applied to the field shielding member without passing through the switching device.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kong Kiho
• Chol Junhee
• Lee Eunsung

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• H10H20/034

  of coatings · CPC title

• H10H20/841

  Reflective coatings, e.g. dielectric Bragg reflectors · CPC title

• H10H29/142 Primary

  Two-dimensional arrangements, e.g. asymmetric LED layout · CPC title

• H10H20/0364

  of interconnections · CPC title