US-12628700-B2 - LED display apparatus

US12628700B2US 12628700 B2US12628700 B2US 12628700B2US-12628700-B2

Abstract

A display apparatus includes a circuit board including a driver circuit, and a pixel array including a plurality of pixels on the circuit board, where each of the plurality of pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel, and where the pixel array includes a lower light emitting structure including a first lower light-emitting diode (LED) cell, a second lower LED cell, and a third lower LED cell respectively corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel, each of the first lower LED cell, the second lower LED cell, and the third lower LED cell including a first semiconductor laminate configured to emit first light of a first wavelength, and a base insulating layer on lower surfaces of the first lower LED cell, the second lower LED cell, and the third lower LED cell.

Inventors

Sammook KANG
MiHyun Kim
Hankyu SEONG
Jihye YEON

Assignees

SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20230713
Priority Date: 20220715

Claims (20)

1 . A display apparatus, comprising: a circuit board comprising a driver circuit; and a pixel array comprising a plurality of pixels on the circuit board, wherein each of the plurality of pixels comprises a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the pixel array further comprises: a lower light emitting structure comprising: a first lower light-emitting diode (LED) cell, a second lower LED cell, and a third lower LED cell respectively corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel, each of the first lower LED cell, the second lower LED cell, and the third lower LED cell comprising a first semiconductor laminate configured to emit first light of a first wavelength, and a base insulating layer on lower surfaces of the first lower LED cell, the second lower LED cell, and the third lower LED cell and comprising an inter-cell insulating portion extending to a region between the first lower LED cell, the second lower LED cell, and the third lower LED cell; an upper light emitting structure on the lower light emitting structure, the upper light emitting structure comprising: a transparent insulating portion on the first lower LED cell, an upper LED cell on the second lower LED cell and comprising a second semiconductor laminate configured to emit second light of a second wavelength, a wavelength converter on the third lower LED cell and configured to convert the first light into third light of a third wavelength, and a light blocking partition disposed among the transparent insulating portion, the upper LED cell, and the wavelength converter, the light blocking partition optically isolating the transparent insulating portion, the upper LED cell, and the wavelength converter from each other; a first bonding structure comprising: a first bonding insulating layer on an upper surface of the lower light emitting structure, and a first bonding electrode at least partially surrounded by the first bonding insulating layer and connected to each of the first lower LED cell, the second lower LED cell, and the third lower LED cell; and a second bonding structure comprising: a second bonding insulating layer on a lower surface of the upper light emitting structure and bonded to the first bonding insulating layer, and a second bonding electrode at least partially surrounded by the second bonding insulating layer, connected to at least the upper LED cell, and bonded to the first bonding electrode.
2 . The display apparatus of claim 1 , wherein each of the first semiconductor laminate and the second semiconductor laminate comprises a first conductive semiconductor layer, an active layer and a second conductive semiconductor layer, and wherein the lower light emitting structure and the upper light emitting structure are arranged such that the second conductive semiconductor layers of the first semiconductor laminate and the second semiconductor laminate face each other.
3 . The display apparatus of claim 2 , wherein the first bonding electrode and the second bonding electrode are respectively connected to the second conductive semiconductor layers of the first semiconductor laminate and the second semiconductor laminate.
4 . The display apparatus of claim 2 , wherein the pixel array further comprises: a first individual electrode on a lower surface of the first lower LED cell and connected to the first conductive semiconductor layer of the first lower LED cell; a second individual electrode penetrating a portion of the second lower LED cell, the first bonding insulating layer, the second bonding insulating layer, and the upper LED cell, and connected to the first conductive semiconductor layer of the upper LED cell; and a third individual electrode on a lower surface of the third lower LED cell and connected to the first conductive semiconductor layer of the third lower LED cell.
5 . The display apparatus of claim 4 , wherein the second individual electrode comprises: a through via extending from a lower surface of the second lower LED cell to the second conductive semiconductor layer of the upper LED cell; and a side wall insulating film at least partially surrounding a side surface of the through via.
6 . The display apparatus of claim 1 , wherein the first bonding electrode and the second bonding electrode comprise shapes corresponding to each other in a plan view.
7 . The display apparatus of claim 6 , wherein the first bonding electrode and the second bonding electrode comprise a grid shape in a plan view.
8 . The display apparatus of claim 6 , wherein the first bonding electrode and the second bonding electrode comprise a plurality of line shapes in a plan view.
9 . The display apparatus of claim 1 , wherein the first bonding electrode comprises an upper surface substantially coplanar with an upper surface of the first bonding insulating layer, and wherein the second bonding electrode comprises a lower surface substantially coplanar with a lower surface of the second bonding insulating layer.
10 . The display apparatus of claim 1 , wherein each of the first bonding insulating layer and the second bonding insulating layer comprise a transparent insulating material.
11 . The display apparatus of claim 1 , wherein the first bonding electrode comprises a grid shape in a plan view, and wherein the inter-cell insulating portion at least partially overlaps the first bonding electrode in a direction substantially perpendicular to an upper surface of the circuit board.
12 . The display apparatus of claim 1 , wherein the base insulating layer comprises at least one of SiO 2 , SiN, SiCN, SiOC, SiON and SiOCN.
13 . The display apparatus of claim 1 , wherein each of the first lower LED cell, the second lower LED cell, and the third lower LED cell comprises a side surface that is inclined such that a width of each of the first lower LED cell, the second lower LED cell, and the third lower LED cell increases approaching the upper light emitting structure, and wherein the upper LED cell comprises a side surface that is inclined such that a width of the upper LED cell increases approaching the lower light emitting structure.
14 . The display apparatus of claim 1 , wherein the light blocking partition at least partially overlaps the second bonding electrode in a direction substantially perpendicular to an upper surface of the circuit board.
15 . The display apparatus of claim 1 , wherein the first semiconductor laminate is configured to emit blue light, wherein the second semiconductor laminate is configured to emit green light, and wherein the wavelength converter is configured to convert at least a portion of blue light to red light.
16 . The display apparatus of claim 1 , wherein the first sub-pixel and the third sub-pixel are disposed in a first diagonal direction and the second sub-pixel is disposed in a second diagonal direction in a plan view.
17 . The display apparatus of claim 1 , wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel are disposed side by side in one direction in a plan view.
18 . A display apparatus, comprising: a circuit board comprising a driver circuit; and a pixel array on the circuit board and comprising a plurality of pixels, wherein each of the plurality of pixels comprises a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the pixel array further comprises: a lower light emitting structure comprising a first lower light-emitting diode (LED) cell, a second lower LED cell, and a third lower LED cell respectively corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel and configured to emit blue light, an upper light emitting structure comprising: a transparent insulating portion on the first lower LED cell, an upper LED cell on the second lower LED cell and configured to emit green light, and a wavelength converter on the third lower LED cell and configured to convert blue light into red light, a first bonding structure comprising: a first bonding insulating layer on an upper surface of the lower light emitting structure, and a first bonding electrode at least partially surrounded by the first bonding insulating layer and connected to each of the first lower LED cell, the second lower LED cell, and the third lower LED cell, and a second bonding structure comprising: a second bonding insulating layer on a lower surface of the upper light emitting structure and bonded to the first bonding insulating layer, and a second bonding electrode at least partially surrounded by the second bonding insulating layer, connected to the upper LED cell, and bonded to the first bonding electrode.
19 . The display apparatus of claim 18 , wherein the first bonding electrode comprises a grid shape connected to each of the first lower LED cell, the second lower LED cell, and the third lower LED cell along a boundary of the first lower LED cell, the second lower LED cell, and the third lower LED cell.
20 . The display apparatus of claim 19 , wherein the second bonding electrode comprises a grid shape corresponding to a shape of the first bonding electrode.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application claims benefit of priority to Korean Patent Application No. 10-2023-0013740 filed on Feb. 1, 2023, and Korean Patent Application No. 10-2022-0087470 filed on Jul. 15, 2022 in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference in their entireties. BACKGROUND 1. Field Example embodiments of the present disclosure relate to a light-emitting diode (LED) display apparatus. 2. Description of Related Art A semiconductor light emitting diode (LED) may be used as a light source for lighting devices and also various electronic products. Also, an LED may be widely used as a light source for various display devices such as a television (TV), a mobile phone, a personal computer (PC), a notebook PC, a personal digital assistant (PDA), etc. A general display device may mainly include a display panel including a liquid crystal display (LCD) and a backlight, but recently, an LED display panel using LED elements (e.g., micro LEDs) as a light source of a pixel (sub-pixel) has been developed. Such a display device may have a compact size, and may also implement a high-brightness display device having excellent light efficiency as compared to a LCD. Information disclosed in this Background section has already been known to or derived by the inventors before or during the process of achieving the embodiments of the present application, or is technical information acquired in the process of achieving the embodiments. Therefore, it may contain information that does not form the prior art that is already known to the public. SUMMARY Provided is a light-emitting diode (LED) display apparatus having high efficiency which may be formed by a simplified alignment process. Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments. According to an aspect of an example embodiment, a display apparatus may include a circuit board including a driver circuit, and a pixel array including a plurality of pixels on the circuit board, where each of the plurality of pixels may include a first sub-pixel, a second sub-pixel, and a third sub-pixel, where the pixel array may include a lower light emitting structure including a first lower light-emitting diode (LED) cell, a second lower LED cell, and a third lower LED cell respectively corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel, each of the first lower LED cell, the second lower LED cell, and the third lower LED cell including a first semiconductor laminate configured to emit first light of a first wavelength, and a base insulating layer on lower surfaces of the first lower LED cell, the second lower LED cell, and the third lower LED cell and including an inter-cell insulating portion extending to a region between the first lower LED cell, the second lower LED cell, and the third lower LED cell, an upper light emitting structure on the lower light emitting structure, the upper light emitting structure including a transparent insulating portion on the first lower LED cell, an upper LED cell on the second lower LED cell and including a second semiconductor laminate configured to emit second light of a second wavelength, a wavelength converter on the third lower LED cell and configured to convert the first light into third light of a third wavelength, and a light blocking partition disposed among the transparent insulating portion, the upper LED cell, and the wavelength converter, the light blocking partition optically isolating the transparent insulating portion, the upper LED cell, and the wavelength converter from each other, a first bonding structure including a first bonding insulating layer on an upper surface of the lower light emitting structure and a first bonding electrode at least partially surrounded by the first bonding insulating layer and connected to each of the first lower LED cell, the second lower LED cell, and the third lower LED cell, and a second bonding structure including a second bonding insulating layer on a lower surface of the upper light emitting structure and bonded to the first bonding insulating layer, and a second bonding electrode at least partially surrounded by the first bonding insulating layer, connected to at least the upper LED cell, and bonded to the first bonding electrode. According to an aspect of an example embodiment, a display apparatus may include a circuit board including a driver circuit and a pixel array on the circuit board and including a plurality of pixels, where each of the plurality of pixels may include a first sub-pixel, a second sub-pixel, and a third sub-pixel, where the pixel array may further include a lower light emitting structure including a first lower LED cell, a second lower LED cell, and a third lower LED cell respectively corresponding to the first sub-pixel,