US-12622325-B2 - Display device and method of fabricating the same

US12622325B2US 12622325 B2US12622325 B2US 12622325B2US-12622325-B2

Abstract

A display device includes: a substrate including a plurality of pixels; and a light-emitting element layer on the substrate. The light-emitting element layer includes: light-emitting elements in each pixel, configured to emit light, and arranged along a first direction; viewing angle control portions respectively on the light-emitting elements; and reflecting portions respectively on one side and another side of the light-emitting elements in a second direction crossing the first direction in a plan view

Inventors

Young Min Park
Dong Hwan Kim
Jung Hoon SHIN
Sang Won Lee

Assignees

SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20221121
Priority Date: 20220406

Claims (19)

1 . A display device comprising: a substrate comprising a plurality of pixels; and a light-emitting element layer on the substrate, the light-emitting element layer comprising: light-emitting elements in each pixel, configured to emit light, and arranged along a first direction; viewing angle control portions respectively on the light-emitting elements; and reflecting portions respectively on one side and another side of the light-emitting elements in a second direction crossing the first direction in a plan view, wherein each of the viewing angle control portions comprises a first layer having a first refractive index and a second layer having a second refractive index that is smaller than the first refractive index.
2 . The display device of claim 1 , wherein each of the first layer and the second layer is provided in plural.
3 . The display device of claim 2 , wherein the plurality of first layers and the plurality of second layers are alternately stacked on each other.
4 . The display device of claim 3 , wherein a difference between the first refractive index and the second refractive index is 0.3 or more.
5 . The display device of claim 1 , wherein the viewing angle control portions on the respective light-emitting elements are spaced apart from one another.
6 . The display device of claim 1 , wherein the reflecting portions comprise an opaque reflective material.
7 . The display device of claim 6 , wherein the opaque reflective material comprises resin comprising white-color-based pigments.
8 . The display device of claim 7 , wherein a reflectance of the reflecting portions with respect to the light emitted from each of the light-emitting elements is 80% or more.
9 . The display device of claim 1 , wherein the reflecting portions are in direct contact with adjacent ones of the light-emitting elements.
10 . The display device of claim 1 , wherein the light-emitting element layer further comprises light-transmitting portions filling between the light-emitting elements and the reflecting portions in a plan view.
11 . The display device of claim 10 , wherein the light-transmitting portions comprise transparent resin.
12 . The display device of claim 10 , wherein a light transmittance of the light-transmitting portions with respect to the light emitted from each of the light-emitting elements is 90% or more.
13 . A display device comprising: a substrate comprising a pixel, the pixel comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel, the first to third sub-pixels being arranged in a first direction; and a light-emitting element layer on the substrate, the light-emitting element layer comprising: a first light-emitting element on the first sub-pixel; a second light-emitting element on the second sub-pixel; a third light-emitting element on the third sub-pixel; a first viewing angle control portion on the first light-emitting element; a second viewing angle control portion on the second light-emitting element; a third viewing angle control portion on the third light-emitting element; and reflecting portions respectively on one side and another side of the first light-emitting element, the second light-emitting element, and the third light-emitting element in a second direction crossing the first direction in a plan view, wherein each of the first viewing angle control portion, the second viewing angle control portion, and the third viewing angle control portion comprises a first layer having a first refractive index and a second layer having a second refractive index that is smaller than the corresponding first refractive index.
14 . The display device of claim 13 , wherein the first light-emitting element is configured to emit a first light, the second light-emitting element is configured to emit a second light, and the third light-emitting element is configured to emit a third light, and wherein a wavelength of the third light has a value between a wavelength of the first light and a wavelength of the second light, and the wavelength of the second light is greater than the wavelength of the first light.
15 . The display device of claim 14 , wherein the first viewing angle control portion has a first thickness, the second viewing angle control portion has a second thickness, and the third viewing angle control portion has a third thickness, and wherein the third thickness has a value between the first thickness and the second thickness, and the second thickness is greater than the first thickness.
16 . The display device of claim 15 , wherein each of the first viewing angle control portion, the second viewing angle control portion, and the third viewing angle control portion comprises a first layer having a first refractive index and a second layer having a second refractive index that is smaller than the first refractive index, wherein each of the first layer and the second layer is provided in plural, and wherein the plurality of first layers and the plurality of second layers are alternately stacked on each other.
17 . The display device of claim 16 , wherein a difference between the first refractive index and the second refractive index is 0.3 or more.
18 . A method of fabricating a display device, the method comprising disposing a light-emitting element layer on a substrate, the substrate comprising a plurality of pixels, the disposing of the light-emitting element comprising: disposing light-emitting elements in each pixel and arranged in a first direction, the light-emitting elements being configured to emit light, and disposing viewing angle control portions respectively on the light-emitting elements; disposing reflecting portions respectively on one side and another side of the light-emitting elements in a second direction crossing the first direction in a plan view; and disposing and filling light-transmitting portions between the light-emitting elements and the reflecting portions in a plan view, wherein each of the viewing angle control portions comprises a first layer having a first refractive index and a second layer having a second refractive index that is smaller than the first refractive index.
19 . The method of claim 18 , wherein the disposing of the light-emitting elements and the viewing angle control portions comprises: forming target light-emitting elements on one surface of a mother substrate; disposing a viewing angle control layer on the other surface that is opposite to the one surface of the mother substrate; and disposing the light-emitting elements and the viewing angle control portions in each of the pixels by cutting the mother substrate and the viewing angle control layer.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to and the benefit of Korean Patent Application No. 10-2022-0042826, filed on Apr. 6, 2022, in the Korean Intellectual Property Office, the contents of which are herein incorporated by reference in their entirety. BACKGROUND 1. Field Aspects of embodiments of the present disclosure relate to a display device and a method of fabricating the same. 2. Description of the Related Art With the advancement of the information society, the demand for display devices for displaying images in various forms is increasing. Examples of such display devices include flat panel display devices, including liquid crystal display (LCD) devices, field emission display (FED) devices, light emitting display devices, and the like. Light emitting display devices include an organic light emitting display device including an organic light-emitting element or light emitting diode display device including an inorganic light emitting diode element, such as a light emitting diode (LED) as a light-emitting element. In the case of a display device for a vehicle that is located in front of a driver or passenger, an image displayed on the display device may be visible as a reflection on the windshield at nighttime. When this occurs, the reflected image may distract the driver. Also, when the passenger views an image via the display device and the image is exposed to (or visible to) the driver, the image may disturb the driver and impact the driver's driving ability and focus. SUMMARY Aspects of the present disclosure provide a display device configured to control a vertical viewing angle. However, aspects of the present disclosure are not restricted to those set forth herein. The above and other aspects of the present disclosure will become more apparent to one of ordinary skill in the art to which the present disclosure pertains by referencing the detailed description of the present disclosure below. According to an embodiment of the present disclosure, a display device includes: a substrate including a plurality of pixels; and a light-emitting element layer on the substrate. The light-emitting element layer includes: light-emitting elements in each pixel, configured to emit light, and arranged along a first direction; viewing angle control portions respectively on the light-emitting elements; and reflecting portions respectively on one side and another side of the light-emitting elements in a second direction crossing the first direction in a plan view. Each of the viewing angle control portions may include a first layer having a first refractive index and a second layer having a second refractive index that is smaller than the first refractive index. Each of the first layer and the second layer may be provided in plural. The plurality of first layers and the plurality of second layers may be alternately stacked on each other. A difference between the first refractive index and the second refractive index may be 0.3 or more. The viewing angle control portions on the respective light-emitting elements may be spaced apart from one another. The reflecting portions include may an opaque reflective material. The opaque reflective material may include resin including white-color-based pigments. A reflectance of the reflecting portions with respect to the light emitted from each of the light-emitting elements may be 80% or more. The reflecting portions may be in direct contact with adjacent the light-emitting elements. The light-emitting element layer may further include light-transmitting portions filling between the light-emitting elements and the reflecting portions in a plan view. The light-transmitting portions may include transparent resin. A light transmittance of the light-transmitting portions with respect to the light emitted from each of the light-emitting elements may be 90% or more. According to another embodiment of the present disclosure, a display device includes: a substrate including a pixel, the pixel including a first sub-pixel, a second sub-pixel, and a third sub-pixel, the first to third sub-pixels being arranged in a first direction, and a light-emitting element layer on the substrate. The light-emitting element layer includes: a first light-emitting element on the first sub-pixel; a second light-emitting element on the second sub-pixel; a third light-emitting element on the third sub-pixel; a first viewing angle control portion on the first light-emitting element; a second viewing angle control portion on the second light-emitting element; a third viewing angle control portion on the third light-emitting element; and reflecting portions respectively on one side and another side the first light-emitting element, the second light-emitting element, and the third light-emitting element in a second direction crossing the first direction in a plan view. The first light-emitting element may be configured to emit a first light, the second light-emitting elemen