EP-4738439-A1 - LIGHT-EMITTING DIODE AND DISPLAY MODULE COMPRISING SAME

EP4738439A1EP 4738439 A1EP4738439 A1EP 4738439A1EP-4738439-A1

Abstract

A light-emitting diode is disclosed. The light-emitting diode comprises: a metal pad; a first sub-pixel provided on the metal pad and emitting light of a first color; a second sub-pixel emitting light of a second color different from the first color; and a third sub-pixel emitting light of a third color different from the first color and the second color.

Inventors

LEE, JINWOONG
YOO, SUNGHYUN
KIM, Hyunkyung
LEE, KYEHOON

Assignees

Samsung Electronics Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20240927

Claims (15)

A light-emitting diode comprising: a metal pad; a first sub-pixel, arrangeable on the metal pad, configured to emit light of a first color; a second sub-pixel configured to emit light of a second color different from the light of the first color; and a third sub-pixel configured to emit light of a third color different from the light of the first color from the first sub-pixel and the light of the second color from the second sub-pixel.
The light-emitting diode as claimed in claim 1, wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are arranged parallel to one another along a horizontal direction, and the light-emitting diode further includes: a first partition to be disposed between the first sub-pixel and the second sub-pixel, and a second partition to be disposed between the second sub-pixel and the third sub-pixel.
The light-emitting diode as claimed in claim 2, wherein the first partition and the second partition respectively include a distributed Bragg reflector (DBR) structure.
The light-emitting diode as claimed in claim 2, wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are electrically insulated, respectively, from the metal pad through an insulating layer.
The light-emitting diode as claimed in claim 2, wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are electrically connected in series.
The light-emitting diode as claimed in claim 5, wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel respectively include an anode device electrode and a cathode device electrode, the cathode device electrode of the first sub-pixel is electrically connected to the anode device electrode of the second sub-pixel, and the cathode device electrode of the second sub-pixel is electrically connected to the anode device electrode of the third sub-pixel.
The light-emitting diode as claimed in claim 6, wherein the cathode device electrode of the first sub-pixel and the anode device electrode of the second sub-pixel are integrally formed, and the cathode device electrode of the second sub-pixel and the anode device electrode of the third sub-pixel are integrally formed.
The light-emitting diode as claimed in claim 7, wherein the cathode device electrode of the third sub-pixel is electrically connected to the metal pad.
The light-emitting diode as claimed in claim 5, wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel respectively include an anode device electrode and a cathode device electrode, and the cathode device electrode of the first sub-pixel, the cathode device electrode of the second sub-pixel, and the cathode device electrode of the third sub-pixel are electrically connected to the metal pad, respectively.
The light-emitting diode as claimed in claim 9, wherein the cathode device electrode of the first sub-pixel and the anode device electrode of the second sub-pixel are integrally formed, and the cathode device electrode of the second sub-pixel and the anode device electrode of the third sub-pixel are integrally formed.
The light-emitting diode as claimed in claim 2, wherein one of the first sub-pixel, the second sub-pixel, and the third sub-pixel further includes a color conversion layer, and the color conversion layer includes quantum dots or nano phosphors.
The light-emitting diode as claimed in claim 2, wherein the first sub-pixel includes a semiconductor layer configured to emit light of the first color, the second sub-pixel includes a semiconductor layer configured to emit light of the first color, and a first color conversion layer stacked on the semiconductor layer of the second sub-pixel and excited by light of the first color from the second sub-pixel to emit light of the second color different from light of the first color, and the third sub-pixel includes a semiconductor layer configured to emit light of the first color, and a second color conversion layer stacked on the semiconductor layer of the third sub-pixel and excited by light of the first color from the third sub-pixel to emit light of the third color different from light of the first color and the second color, the first color conversion layer and the second color conversion layer respectively including quantum dots or nano phosphors.
The light-emitting diode as claimed in claim 1, wherein the second sub-pixel and the third sub-pixel are stacked on the first sub-pixel at an interval therebetween, and light emitted from the first sub-pixel is projected into a space between the second sub-pixel and the third sub-pixel.
The light-emitting diode as claimed in claim 13, wherein the first sub-pixel includes: a first transparent electrode layer stacked on a light-emitting surface of the first sub-pixel, a distributed Bragg reflector (DBR) layer covering a side surface of the first sub-pixel and a portion of the first transparent electrode layer, and an adhesive layer formed of a conductive metal material, disposed below the first sub-pixel, and metallurgically bonded to the metal pad, and the second sub-pixel and the third sub-pixel are respectively stacked on the DBR layer.
The light-emitting diode as claimed in claim 14, wherein the second sub-pixel and the third sub-pixel respectively include an anode device electrode and a cathode device electrode, and the cathode device electrode of the second sub-pixel and the cathode device electrode of the third sub-pixel are electrically connected to the metal pad, respectively.

Description

[Technical Field] The present disclosure relates to a light-emitting diode and a display module comprising the same. [Background Art] The display panel may include a thin film transistor (TFT) layer having a plurality of TFTs and a plurality of light-emitting diodes mounted on the TFT layer. The plurality of light-emitting diodes may express various colors while being operated in pixel units or sub-pixel units. An operation of each pixel or each sub-pixel may be controlled by the plurality of TFTs. Each light-emitting diode may emit various colors, for example, red, green, and blue. [Disclosure of Invention] [Solution to Problem] According to at least one embodiment of the present disclosure, provided is a light-emitting diode including: a metal pad; a first sub-pixel, arrangeable on the metal pad, configured to emit light of a first color; a second sub-pixel configured to emit light of a second color different from the light of the first color; and a third sub-pixel configured to emit light of a third color different from the light of the first color from the first sub-pixel and the light of the second color from the second sub-pixel. The first sub-pixel, the second sub-pixel, and the third sub-pixel may be arranged parallel to one another along a horizontal direction. The light-emitting diode may further include a first partition to be disposed between the first sub-pixel and the second sub-pixel, and a second partition to be disposed between the second sub-pixel and the third sub-pixel. The first partition and the second partition may respectively include a distributed Bragg reflector (DBR) structure. The first sub-pixel, the second sub-pixel, and the third sub-pixel may be electrically insulated, respectively, from the metal pad through an insulating layer. The first sub-pixel, the second sub-pixel, and the third sub-pixel may be electrically connected in series. The first sub-pixel, the second sub-pixel, and the third sub-pixel may repsectively include an anode device electrode and a cathode device electrode. The cathode device electrode of the first sub-pixel may be electrically connected to the anode device electrode of the second sub-pixel. The cathode device electrode of the second sub-pixel may be electrically connected to the anode device electrode of the third sub-pixel. The cathode device electrode of the first sub-pixel and the anode device electrode of the second sub-pixel may be integrally formed. The cathode device electrode of the second sub-pixel and the anode device electrode of the third sub-pixel may be integrally formed. The cathode device electrode of the third sub-pixel may be electrically connected to the metal pad. The first sub-pixel, the second sub-pixel, and the third sub-pixel may respectively include an anode device electrode and a cathode device electrode. The cathode device electrode of the first sub-pixel, the cathode device electrode of the second sub-pixel, and the cathode device electrode of the third sub-pixel may respectively be electrically connected to the metal pad. The cathode device electrode of the first sub-pixel and the anode device electrode of the second sub-pixel may be integrally formed. The cathode device electrode of the second sub-pixel and the anode device electrode of the third sub-pixel may be integrally formed. One of the first sub-pixel, the second sub-pixel, and the third sub-pixel may further include a color conversion layer. The color conversion layer may include quantum dots or nano phosphors. The first sub-pixel may include a semiconductor layer configured to emit light of the first color. The second sub-pixel may include a semiconductor layer configured to emit light of the first color, and a first color conversion layer stacked on the semiconductor layer of the second sub-pixel and excited by light of the first color from the second sub-pixel to emit light of the second color different from light of the first color. The third sub-pixel may include a semiconductor layer configured to emit light of the first color, and a second color conversion layer stacked on the semiconductor layer of the third sub-pixel and excited by light of the first color from the third sub-pixel to emit light of the third color different from light of the first color and the second color. The second sub-pixel and the third sub-pixel may be stacked on the first sub-pixel at an interval therebetween. Light emitted from the first sub-pixel may be projected into a space between the second sub-pixel and the third sub-pixel. The first sub-pixel may include a first transparent electrode layer stacked on a light-emitting surface of the first sub-pixel, a distributed Bragg reflector (DBR) layer covering a side surface of the first sub-pixel and a portion of the first transparent electrode layer, and an adhesive layer formed of a conductive metal material, disposed below the first sub-pixel, and metallurgically bonded to the metal pad. The second sub-pixel and the third sub-pix