US-12628484-B2 - Display device and method of fabricating the same

US12628484B2US 12628484 B2US12628484 B2US 12628484B2US-12628484-B2

Abstract

A display device includes light-emitting elements arranged on a circuit substrate, extending in a thickness direction of the circuit substrate, and including a first light-emitting element configured to emit a first light, and a second light-emitting element configured to emit a second light, and having a width that is less than a width of the first light-emitting element, a common electrode layer above the light-emitting elements, and a connection electrode layer between the first light-emitting element and the common electrode layer.

Inventors

Jin Woo Choi
Sung Kook PARK
Sung Eun BAEK
Dae ho Song

Assignees

SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20220523
Priority Date: 20210809

Claims (15)

1 . A display device comprising: light-emitting elements arranged on a circuit substrate, extending in a thickness direction of the circuit substrate, and comprising a first light-emitting element configured to emit a first light, and a second light-emitting element configured to emit a second light, and having a width that is less than a width of the first light-emitting element; a common electrode layer above the light-emitting elements; and a connection electrode layer between the first light-emitting element and the common electrode layer, wherein the first light-emitting element partially overlaps the second light-emitting element in the thickness direction.
2 . The display device of claim 1 , wherein the first light-emitting element is on a different layer from the second light-emitting element.
3 . The display device of claim 2 , wherein the light-emitting elements further comprise a third light-emitting element configured to emit a third light, and on a different layer from the first light-emitting element.
4 . The display device of claim 3 , wherein the third light-emitting element is on a same layer as the second light-emitting element.
5 . The display device of claim 4 , wherein the width of the first light-emitting element is greater than a width of the third light-emitting element.
6 . The display device of claim 4 , wherein portions of the first light-emitting element respectively overlap the second light-emitting element and the third light-emitting element in a plan view.
7 . The display device of claim 2 , wherein the connection electrode layer does not overlap with the second light-emitting element.
8 . The display device of claim 2 , wherein the connection electrode layer comprises a same material as the common electrode layer.
9 . The display device of claim 2 , wherein a width of the connection electrode layer is less than the width of the first light-emitting element.
10 . The display device of claim 1 , wherein the light-emitting elements comprise: a first semiconductor layer on the circuit substrate; an active layer on the first semiconductor layer; and a second semiconductor layer on the active layer.
11 . The display device of claim 10 , wherein the light-emitting elements further comprise an electron-blocking layer between the first semiconductor layer and the active layer, and a superlattice layer between the active layer and the second semiconductor layer.
12 . The display device of claim 11 , wherein the circuit substrate further comprises pixel electrodes, and wherein the first semiconductor layer of the light-emitting elements is connected to a respective one of the pixel electrodes.
13 . The display device of claim 12 , further comprising a connection electrode between the first semiconductor layers of the light-emitting elements and the pixel electrodes.
14 . The display device of claim 13 , wherein a length of the connection electrode of the first light-emitting element is less than a length of the connection electrode of the second light-emitting element.
15 . The display device of claim 10 , wherein the connection electrode layer comprises a same material as the second semiconductor layer.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to, and the benefit of, Korean Patent Application No. 10-2021-0104921 filed on Aug. 9, 2021 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. BACKGROUND 1. Field The present disclosure relates to a display device and a method of fabricating the same. 2. Description of the Related Art As the information-oriented society evolves, various demands for display devices are ever increasing. Display devices may be flat panel display devices such as a liquid-crystal display device, a field emission display device, and a light-emitting display device. Light-emitting display devices may include an organic light-emitting display device including organic light-emitting diodes as the light-emitting elements, an inorganic light-emitting display device including inorganic semiconductor elements as the light-emitting elements, and a micro-LED display device including a light-emitting diodes as the light-emitting elements. Recently, a head mounted display including a light-emitting display device has been developed. A head mounted display (HMD) is a glasses-type monitor device providing virtual reality (VR) or augmented reality (AR) that is worn on a user's body in the form of glasses or a helmet to form a focus close to the user's eyes. A high-resolution micro-LED display panel including micro light-emitting diodes is applied to head mounted displays. SUMMARY Aspects of the present disclosure provide a display device in which internal quantum efficiency is improved by increasing the area of a first light-emitting element. Aspects of the present disclosure also provide a method of fabricating a display device in which internal quantum efficiency is improved by increasing the area of a first light-emitting element. It should be noted that aspects of the present disclosure are not limited to the above-mentioned object, and other aspects of the present disclosure will be apparent to those skilled in the art from the following descriptions. According to an aspect of the present disclosure, there is provided a display device including light-emitting elements arranged on a circuit substrate, extending in a thickness direction of the circuit substrate, and including a first light-emitting element configured to emit a first light, and a second light-emitting element configured to emit a second light, and having a width that is less than a width of the first light-emitting element, a common electrode layer above the light-emitting elements, and a connection electrode layer between the first light-emitting element and the common electrode layer. The first light-emitting element may be on a different layer from the second light-emitting element. The light-emitting elements may further include a third light-emitting element configured to emit a third light, and being on a different layer from the first light-emitting element. The third light-emitting element may be on a same layer as the second light-emitting element. The width of the first light-emitting element may be greater than a width of the third light-emitting element. One or more portions of the first light-emitting element may overlap the second light-emitting element and the third light-emitting element in a plan view. The connection electrode layer might not overlap with the second light-emitting element. The connection electrode layer may include a same material as the common electrode layer. A width of the connection electrode layer may be less than a width of the first light-emitting element. The light-emitting elements may include a first semiconductor layer on the circuit substrate, an active layer on the first semiconductor layer, and a second semiconductor layer on the active layer. The light-emitting elements may further include an electron blocking layer between the first semiconductor layer and the active layer, and a superlattice layer between the active layer and the second semiconductor layer. The circuit substrate may further include pixel electrodes, wherein the first semiconductor layer of the light-emitting elements is connected to a respective one of the pixel electrodes. The display device may further include a connection electrode between the first semiconductor layers of the light-emitting elements and the pixel electrodes. A length of the connection electrode of the first light-emitting element may be less than a length of the connection electrode of the second light-emitting element. The connection electrode layer may include a same material as the second semiconductor layer. According to another aspect of the present disclosure, there is provided a method of fabricating a display device, the method including forming a common electrode layer on a first substrate, forming a first light-emitting element for emitting a first light, and a second light-emitting element for emitting a second light, on the common elect