CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority to and the benefit of Korean patent application number 10-2018-0102240 filed on Aug. 29, 2018, the entire content of which is incorporated herein by reference.

BACKGROUND

1. Field

Various embodiments of the present disclosure relate to a display device.

2. Description of the Related Art

Light emitting diodes (LEDs) may have relatively suitable or satisfactory durability even under poor environmental conditions, and have excellent performance in terms of lifetime and luminance. Recently, research on applying such LEDs to various display devices has become noticeably more active.

As a part of such research, technologies of fabricating an LED having a small size corresponding to the micro-scale or the nano-scale using an inorganic crystalline structure, e.g., a structure obtained by growing a nitride-based semiconductor are being developed. For example, LEDs may be fabricated in a small size enough to form a pixel of a self-luminance display device, etc.

SUMMARY

Various embodiments of the present disclosure are directed to a display device having an improved color gamut.

An embodiment of the present disclosure may provide a display device including: a substrate; a plurality of pixels on the substrate, each of the pixels including first to third sub-pixels each including at least one light emitting diode configured to emit light; and a color conversion layer including first to third color conversion patterns respectively corresponding to the first to third sub-pixels, each of the first to third color conversion patterns being configured to transmit the light or convert the light into light of a different color. The light emitting diode of each of the first to third sub-pixels may be coupled to a first electrode and a second electrode. At least one of the first to third color conversion patterns may include a perovskite compound.

In an embodiment, two of the first to third color conversion patterns each may include a perovskite compound.

In an embodiment, the color conversion patterns each including the perovskite compound are the first and second color conversion patterns, and the first color conversion pattern may be configured to convert the light into red light, the second color conversion pattern may be configured to convert the light into green light, and the third color conversion pattern may be configured to transmit the light.

In an embodiment, at least one of the first and second color conversion patterns may further include a quantum dot.

In an embodiment, the light emitting diode may be configured to emit blue light.

In an embodiment, one of the first to third color conversion patterns may include a perovskite compound, and another one of the first to third color conversion patterns may include a quantum dot.

In an embodiment, the first color conversion pattern may include a quantum dot configured to convert the light into red light, and the second color conversion pattern may include a perovskite compound configured to convert the light into green light.

In an embodiment, the second color conversion pattern may further include a quantum dot.

In an embodiment, the light emitting diode may be configured to emit blue light.

In an embodiment, the perovskite compound may be represented by formula 1 below:
AMX3Formula 1

wherein A may be a monovalent organic cation or a monovalent transition metal or alkali metal cation, M may be a divalent transition metal, rare earth metal, alkaline earth metal, Pb, Sn, Ge, Ga, In, Al, Sb, Bi or Po cation, X may be selected from the group consisting of halogen anions and combinations thereof, and two or more of X may be identical or different.

In an embodiment, the perovskite compound may be represented by formula 2 below:
A3M2X9Formula 2

wherein A may be selected from the group consisting of monovalent organic cations, monovalent transition metal and alkali metal cations, and combinations thereof, M may be selected from the group consisting of trivalent cations and combinations thereof, X may be selected from the group consisting of halogen anions and combinations thereof, and two or more of A, M or X may be identical or different.

In an embodiment, the perovskite compound may be represented by formula 3 below:
A2MM′X6Formula 3

wherein A may be selected from the group consisting of monovalent organic cations, monovalent transition metal and alkali metal cations, and combinations thereof, M may be a monovalent transition metal, alkali metal or In cation, M′ may be a trivalent cation, X may be selected from the group consisting of halogen anions and combinations thereof, and two or more of A, M or X may be identical or different.

In an embodiment, the perovskite compound is represented by formula 4 below:
A2MX4Formula 4

wherein A may be selected from the group consisting of monovalent organic cations, monovalent transition metal and alkali metal cations, and combinations thereof, M may be a divalent cation of a transition metal or other suitable metal, X may be selected from the group consisting of halogen anions and combinations thereof, and two or more of A or X may be identical or different.

In an embodiment, the perovskite compound may have a form selected from the group consisting of a quantum dot, a nanocrystal, a nanoplate, a nanosheet, and combinations thereof.

In an embodiment, a composite includes the perovskite compound and a polymer.

In an embodiment, the color conversion pattern may be provided by scattering or stacking the perovskite compound in a dielectric matrix.

In an embodiment, at least one of the first to third color conversion patterns may further include a scatterer. In an embodiment, the color conversion layer may further include first to third color filters respectively on the first to third color conversion patterns.

