US-12622135-B2 - Organic light emitting diode and display panel

US12622135B2US 12622135 B2US12622135 B2US 12622135B2US-12622135-B2

Abstract

The present disclosure provides an organic light emitting diode and a display panel. The organic light emitting diode includes: a base; a micro-nano structure layer on a side of the base; a first electrode on a side of the micro-nano structure layer away from the base; an electroluminescence layer on a side of the first electrode away from the micro-nano structure layer; and a second electrode on a side of the electroluminescence layer away from the first electrode.

Inventors

Fudong Chen
Zhiqiang Jiao
Qingyu Huang

Assignees

BOE TECHNOLOGY GROUP CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20210913
Priority Date: 20201012

Claims (3)

1 . A display panel, comprising a base, a driving circuit layer on the base, a plurality of organic light emitting diodes on a side of the driving circuit layer away from the base, and, a color filter substrate on a side of the plurality of organic light emitting diodes away from the base; wherein the driving circuit layer comprises a plurality of driving circuits for driving the plurality of organic light emitting diodes; wherein the color filter substrate includes a plurality of filters in one-to-one correspondence with the plurality of organic light emitting diodes and black matrixes between every two filters, and the plurality of filters include red filters, green filters, blue filters; wherein each organic light emitting diode comprises: a micro-nano structure layer on a side of the driving circuit layer away from the base; a first electrode on a side of the micro-nano structure layer away from the base; an electroluminescence layer on a side of the first electrode away from the micro-nano structure layer; and a second electrode on a side of the electroluminescence layer away from the first electrode; wherein the micro-nano structure layer comprises a photonic crystal; each organic light emitting diode further comprises a protective layer between the electroluminescence layer and the second electrode, and an encapsulation layer on a side of the second electrode away from the electroluminescence layer; the second electrode comprises a first indium zinc oxide layer; the protective layer comprises a first inorganic dielectric layer, a first organic semiconductor layer and a second inorganic dielectric layer arranged sequentially in the direction away from the base; a material of the first inorganic dielectric layer and the second inorganic dielectric layer comprises molybdenum trioxide; and a material of the first organic semiconductor layer comprises N, N′-diphenyl-N, N′-(1-naphthyl)-1,1′-biphenyl-4, 4′-diamine; wherein the color filter substrate is located on a side of the encapsulation layer of each organic light emitting diode away from the base; the first electrode has a portion filled in concaves of the photonic crystal; and each driving circuit includes a driving transistor located between the base and the micro-nano structure layer and including a drain electrode, which is electrically connected to and in direct contact with the portion of the first electrode of its corresponding organic light emitting diode.
2 . The display panel of claim 1 , wherein each organic light emitting diode further comprises grating structures provided on a side of the first electrode away from the micro-nano structure layer, on a side of the electroluminescence layer away from the first electrode, and on a side of the second electrode close to the protective layer, respectively; a period of each of the grating structures is the same as a period of the photonic crystal; orthographic projections, on the base, of convexes and concaves of the grating structure on the side of the first electrode away from the micro-nano structure layer and orthographic projections, on the base, of convexes and concaves of the grating structure on the side of the electroluminescence layer away from the first electrode at least partially overlap orthographic projections of convexes and concaves of the photonic crystal on the base, respectively; orthographic projections, on the base, of convexes of the grating structure on the side of the second electrode close to the protective layer at least partially overlap the orthographic projections of the concaves of the photonic crystal on the base; and orthographic projections, on the base, of concaves of the grating structure on the side of the second electrode close to the protective layer at least partially overlap the orthographic projections of the convexes of the photonic crystal on the base.
3 . The display panel of claim 2 , wherein the first electrode comprises a first indium tin oxide layer, a first silver layer, and a second indium tin oxide layer arranged sequentially in a direction away from the base.

Description

TECHNICAL FIELD The present disclosure relates to display technology, and in particular, to an organic light emitting diode and a display panel. BACKGROUND An Organic Light Emitting Diode (OLED) has become a standard accessory for a high-end display due to its advantages of self-luminescence, high brightness, high contrast, fast response, and the like. OLED devices may be divided into bottom-emitting type devices and top-emitting type devices based on a photon outgoing surface. Due to a small aperture ratio of a bottom-emitting type device when the bottom-emitting type device is applied to a display panel, a top-emitting type device is mainly applied to a small and medium-sized, portable apparatus, and the like. SUMMARY According to an aspect of the present disclosure, an organic light emitting diode is provided. The organic light emitting diode includes: a base; a micro-nano structure layer on a side of the base; a first electrode on a side of the micro-nano structure layer away from the base; an electroluminescence layer on a side of the first electrode away from the micro-nano structure layer; and a second electrode on a side of the electroluminescence layer away from the first electrode. Optionally, the micro-nano structure layer includes a first grating and/or a photonic crystal. Optionally, the organic light emitting diode further includes a protective layer between the electroluminescence layer and the second electrode. Optionally, grating structures are provided on a side of the first electrode away from the micro-nano structure layer, on a side of the electroluminescence layer away from the first electrode, and on a side of the second electrode close to the protective layer; a period of each grating structure is the same as a period of the first grating or the photonic crystal; orthographic projections on the base of convexes and concaves of the grating structure on the side of the first electrode away from the micro-nano structure layer and orthographic projections on the base of convexes and concaves of the grating structure on the side of the electroluminescence layer away from the first electrode at least partially overlap with orthographic projections on the base of convexes and concaves of the first grating or the photonic crystal, respectively; orthographic projections on the base of convexes of the grating structure on the side of the second electrode close to the protective layer at least partially overlap with the orthographic projections on the base of the concaves of the first grating or the photonic crystal; and orthographic projection on the base of concaves of the grating structure on the side of the second electrode close to the protective layer at least partially overlap with the orthographic projections on the base of the convexes of the first grating or the photonic crystal. Optionally, the first electrode includes a first indium tin oxide layer, a first silver layer, and a second indium tin oxide layer provided sequentially in a direction away from the base. Optionally, the second electrode includes a first indium zinc oxide layer. Optionally, the protective layer includes a first inorganic dielectric layer, a first organic semiconductor layer and a second inorganic dielectric layer provided sequentially in the direction away from the base. Optionally, a material of the first inorganic dielectric layer and of the second inorganic dielectric layer includes molybdenum trioxide; and a material of the first organic semiconductor layer includes N, N′-diphenyl-N, N′-(1-naphthyl)-1,1′-biphenyl-4, 4′-diamine. Optionally, the organic light emitting diode further includes an encapsulation layer on a side of the second electrode away from the electroluminescence layer. According to another aspect of the present disclosure, a display panel is provided. The display panel includes the above organic light emitting diode and a driving circuit for driving the organic light emitting diode. BRIEF DESCRIPTION OF DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or in the related art, drawings used in the description of the embodiments or the related art will be briefly described below. FIG. 1 is a schematic diagram illustrating a structure of an organic light emitting diode according to an embodiment of the present disclosure; FIG. 2 is a schematic diagram illustrating a structure of a protective layer according to an embodiment of the disclosure; FIG. 3 is a schematic diagram illustrating charge migration in a protective layer according to an embodiment of the present disclosure; FIG. 4 is a schematic diagram illustrating a structure of a first electrode according to an embodiment of the present disclosure; FIG. 5 is a schematic diagram illustrating a structure of a display panel according to an embodiment of the present disclosure; and FIG. 6 is a schematic diagram illustrating a structure of a display panel according to an embodimen