CN112820762A

CN112820762A - OLED display

Info

Publication number: CN112820762A
Application number: CN202011644621.5A
Authority: CN
Inventors: 吉珍太
Original assignee: HKC Co Ltd; Changsha HKC Optoelectronics Co Ltd
Current assignee: HKC Co Ltd; Changsha HKC Optoelectronics Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-05-18
Anticipated expiration: 2040-12-31
Also published as: CN112820762B

Abstract

The invention provides an OLED display, which comprises a back plate, a substrate, a pixel group and an electrode layer, wherein the substrate and the back plate are oppositely arranged; the pixel groups are arranged on one side of the backboard facing the substrate; the electrode layer is arranged on one side, away from the substrate, of the quantum layer and is electrically connected with the pixel group. The technical scheme of the invention relates to the technical field of OLED display, and the electrode layer is used as an anode to be electrically connected with the pixel group, so that the driving efficiency of the pixel group is improved through the electrode layer during display, the display effect is improved, and the use comfort of a user is improved.

Description

OLED display

Technical Field

The invention relates to the technical field of OLED display, in particular to an OLED display.

Background

An OLED (organic light-Emitting Diode), also called organic electroluminescent Display, organic light-Emitting semiconductor (OLED). The OLED is a current type organic light emitting device, and emits light by injection and recombination of carriers, and the intensity of light emission is proportional to the injected current. Under the action of an electric field, holes generated by an anode and electrons generated by a cathode move, are respectively injected into a hole transport layer and an electron transport layer, and migrate to a light emitting layer. When the two meet at the light emitting layer, energy excitons are generated, thereby exciting the light emitting molecules to finally generate visible light. However, in the prior art, as the size of the display screen is larger and larger, the driving voltage attenuation tendency is gradually increased when the OLED is driven to display, so that the driving efficiency is reduced, the display effect of the OLED is reduced, and the comfort level of the user is reduced.

Disclosure of Invention

The invention mainly aims to provide an OLED display, and aims to solve the technical problem that the driving efficiency of the OLED is reduced due to the fact that the driving voltage attenuation trend is gradually increased when the OLED is driven to display in the prior art.

In order to achieve the above object, the present invention provides an OLED display, which includes a back plate, a substrate, a pixel group, and an electrode layer, wherein the substrate is disposed opposite to the back plate; the pixel groups are arranged on one side of the backboard facing the substrate; the electrode layer is arranged on one side, which is far away from the substrate, of the quantum layer of the pixel group, and the electrode layer is electrically connected with the pixel group.

Optionally, the pixel group includes a red pixel, a blue pixel, a green pixel, and a white pixel, where the red pixel, the blue pixel, the green pixel, and the white pixel are sequentially disposed at intervals according to a preset sequence.

Optionally, the red light pixel, the blue light pixel, the green light pixel, or the white light pixel includes an organic light source and a quantum layer, and the organic light source is disposed on the back plate; the quantum layer is arranged on one side of the organic light source, which faces the substrate, and is electrically connected with the organic light source; wherein the light beam emitted by the organic light source transmits through the quantum layer to convert the color of the light beam.

Optionally, the organic light source is a white light source, the white light source includes a yellow-green light emitting layer and two blue light emitting layers, and the yellow-green light emitting layer is disposed between the two blue light emitting layers to superpose light beams emitted by the yellow-green light emitting layer and the two blue light emitting layers into a white light beam.

Optionally, the organic light source is a blue light source, and the blue light source includes at least one blue light emitting layer.

Optionally, the blue light source further comprises a green light emitting layer disposed between any two adjacent blue light emitting layers.

Optionally, the quantum layer comprises a red quantum layer and or a green quantum layer.

Optionally, the OLED display further includes a filter disposed on the substrate, wherein the quantum layer and the filter are disposed in an overlapping manner along a direction perpendicular to the backplane.

Optionally, the filter is a red filter, a green filter, or a blue filter.

Optionally, the OLED display further includes a gate power supply disposed on the substrate on a side facing the backplane, the pixel group being electrically connected to the gate power supply through a pixel electrode.

According to the technical scheme, the electrode layer is used as the anode and is electrically connected with the pixel group, and when the display is carried out, the driving efficiency of the pixel group is improved through the electrode layer, so that the display effect is improved, and the use comfort of a user is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an OLED display according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an OLED display according to another embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an OLED display according to another embodiment of the present invention;

FIG. 4 is a schematic diagram of a pixel group of an OLED display according to the present invention;

fig. 5 is a partially enlarged schematic view of the organic light source of fig. 1.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Pixel group	11	Red light pixel
12	Green pixel	13	Blue light pixel
				14	White light pixel	15	Organic light source
16	Quantum layer	17	Optical filter
				18	Electrode layer	20	Grid power supply
30	Substrate	40	Back plate
				50	Hole transport layer	60	Blue light emitting layer
70	Electron transport layer	80	Negative charge generation layer
				90	Positive charge generating layer

The implementation, functional features and advantages of the objects of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides an OLED display, please refer to fig. 1 and 4, the OLED display includes a back plate 40, a substrate 30, a pixel group 10 and an Electrode Layer 18(QEL, Quantum-dot Electrode Layer), the substrate 30 and the back plate 40 are disposed opposite to each other; the pixel group 10 is disposed on the back plate 40 on a side facing the substrate 30, the electrode layer 18 is disposed on the quantum layer 16 on a side facing away from the substrate 30, and the electrode layer 18 is electrically connected to the pixel group 10. The pixel group 10 is disposed on the back plate 40, light beams emitted by the pixel group 10 are emitted from one side of the substrate 30 (please refer to direction a in fig. 1), a light emitting surface of the pixel group 10 is one side of the substrate 30, that is, the OLED display displays in a back light emitting manner, and a user observes image information displayed after the pixel groups 10 displaying different colors are combined through the substrate 30

The electrode layer 18 is used as an anode and electrically connected to the pixel group 10, the electrode layer 18 provides a certain voltage to the pixel group 10, and adjusts the current of the pixel group 10; the OLED display further comprises a grid power supply 20, wherein the grid power supply 20 is arranged on one side of the substrate 30, which faces to the back plate 40, and the pixel group 10 is electrically connected with a source and a drain of the grid power supply 20 through a pixel electrode, so that power is supplied to the pixel group 10, a control command is sent to the pixel group 10, and the like.

Specifically, the pixel group 10 includes a red pixel 11, a blue pixel 13, a green pixel 12, and a white pixel 14, wherein the red pixel 11, the blue pixel 13, the green pixel 12, and the white pixel 14 are sequentially arranged at intervals according to a preset sequence; the arrangement order of the red light pixels 11, the blue light pixels 13, the green light pixels 12 and the white light pixels 14 can be adjusted, that is, the preset order is the red light pixels 11, the blue light pixels 13, the green light pixels 12 and the white light pixels 14 from left to right, or the blue light pixels 13, the red light pixels 11, the green light pixels 12 and the white light pixels 14 can also be adjusted. The arrangement order of the red light pixels 11, the blue light pixels 13, the green light pixels 12 and the white light pixels 14 does not constitute a limitation of the OLED display structure of the present invention. The sizes of the red light pixel 11, the blue light pixel 13, the green light pixel 12, and the white light pixel 14 may also be adjusted, and since the light emitting efficiency and the light emitting life of each color pixel are also different, in order to ensure the uniformity of the light, the light emitting efficiencies of the red light pixel 11, the blue light pixel 13, the green light pixel 12, and the white light pixel 14 need to be the same, so that the sizes of the red light pixel 11, the blue light pixel 13, the green light pixel 12, and the white light pixel 14 may also be different, that is, the size of the red light pixel 11 may be larger than the size of the blue light pixel 13, the size of the green light pixel 12 may be larger than the size of the white light pixel 14. The number of the red pixels 11, the blue pixels 13, the green pixels 12, or the white pixels 14 is at least one. In this embodiment, in order to meet the requirement of the user, the number of the red pixels 11, the blue pixels 13, the green pixels 12, or the white pixels 14 may be adjusted, so as to change the display luminance, the color saturation, and the like of the OLED display, thereby improving the compatibility of the OLED display of the present invention.

Further, the red light pixel 11, the blue light pixel 13, the green light pixel 12, or the white light pixel 14 includes an organic light source 15 and a Quantum layer 16 (QD), the organic light source 15 is disposed on the back plate 40; the quantum layer 16 is arranged on one side of the organic light source 15 facing the substrate 30 and is electrically connected with the organic light source 15; wherein the light beam emitted from the organic light source 15 is transmitted through the quantum layer 16 to convert the color of the light beam. The red pixel 11, the blue pixel 13, the green pixel 12, or the white pixel 14 are all sub-pixels of the pixel group 10, sub-pixels of different colors emit light through the organic light source 15, when the light beam emitted by the organic light source 15 passes through the quantum layer 16, the quantum layer 16 may convert the color of the light beam emitted by the organic light source 15, for example, when the quantum layer 16 is a red quantum layer, the color of the light beam emitted by the organic light source 15 is converted into red, and when the quantum layer 16 is a green quantum layer, the color of the light beam emitted by the organic light source 15 is converted into green, and the like. Meanwhile, the quantum layer 16 can be used to improve the conversion efficiency of the light beam emitted by the organic light source 15, thereby indirectly improving the light emitting efficiency of the organic light source 15 and making the color brighter.

According to the technical scheme of the invention, the electrode layer 18 is used as an anode and is electrically connected with the pixel group 10, and when the display is carried out, the driving efficiency of the pixel group 10 is improved through the electrode layer 18, so that the display effect is improved, and the use comfort of a user is improved.

Further, as an embodiment, referring to fig. 5, the organic light source 15 may be a white light source, that is, the color of the light beam emitted by the organic light source 15 is white, specifically, the white light source includes a Yellow-Green emitting layer (Yellow-Green EML) and two Blue emitting layers (Blue EML), and the Yellow-Green emitting layer is disposed between the two Blue emitting layers so that the light beams emitted by the Yellow-Green emitting layer and the two Blue emitting layers are superimposed into a white light beam. In addition, the white light source further includes an Electron Transport Layer (ETL), an Electron Injection Layer (EIL), a Hole Transport Layer (HTL), a positive charge generation layer (p.cgl), a negative charge generation layer (n.cgl), and the like, and the light emitting layer of each color is combined in a specific manner to realize a light emitting function, for example, the light emitting layer of each color is overlapped with the electron transport layer 70(ETL), the Electron Injection Layer (EIL), the hole transport layer 50(HTL), the positive charge generation layer (p.cgl), and the negative charge generation layer 80(n.cgl) to realize a light source.

When the white light source is used as the light source, in order to realize that the sub-pixel emits a red light beam (i.e., forms the red light pixel 11), the red quantum layer may be used to cover the red quantum layer on the white light source, so that the color of the light beam passing through the red quantum layer is converted into red, and the red light pixel 11 is formed. In addition, in order to further improve the Color reproducibility of the light beam, a Filter 17 (C/F) may be further used, where the Filter 17 is disposed on the substrate 30, and the quantum layer 16 and the Filter 17 are disposed in an overlapping manner along a direction perpendicular to the back plate 40, that is, after the light beam passes through the red quantum layer, the light beam passes through the Filter 17 to improve the Color reproducibility of the light beam. It should be noted that the color of the filter 17 is the same as the color of the quantum layer 16, that is, when the quantum layer is red, the filter 17 is the red filter 17, so that the color reproducibility is higher after the red light beam passing through the red quantum layer passes through the red filter 17 again, thereby further improving the display effect.

Similarly, in order to realize that the sub-pixel emits a green light beam (i.e. forms the green pixel 12), the green quantum layer may be used to cover the white light source, so that the color of the light beam transmitted through the green quantum layer is changed to green, thereby forming the green pixel 12. In addition, as in the red pixel 11, a green filter 17 may be used to further improve the color reproducibility of the light beam, and it is only necessary to ensure that the color of the filter 17 matches the color of the quantum layer 16.

It should be noted that, in practical applications, since the conversion efficiency of the blue light beam is high, in the embodiment, referring to fig. 2, it is not necessary to convert the light beam emitted by the white light source by disposing a blue quantum layer, and only the blue filter 17 is disposed to filter the light beam into the blue light beam, so as to reduce the production cost of the OLED display of the present invention.

As another embodiment, the organic light source 15 may be a Blue light source, that is, the color of the light beam emitted by the organic light source 15 is Blue, specifically, the Blue light source includes at least three Blue light emitting layers (Blue EML), and in addition, the white light source further includes an Electron Transport Layer (ETL), an Electron Injection Layer (EIL), a Hole Transport Layer (HTL), a positive charge generation layer (p.cgl), a negative charge generation layer (n.cgl), and the like, and the light emitting function is realized by combining the layers in a specific manner.

When the blue light source is used as the light source, similarly, in order to realize that the sub-pixel emits a red light beam (i.e., forms the red light pixel 11), the red quantum layer may be used to cover the blue light source, so that the color of the light beam passing through the red quantum layer is converted into red, and the red light pixel 11 is formed. In addition, in order to further improve the Color reproducibility of the light beam, a Filter 17 (C/F) may be further used, where the Filter 17 is disposed on the substrate 30, and the quantum layer 16 and the Filter 17 are disposed in an overlapping manner along a direction perpendicular to the back plate 40, that is, after the light beam passes through the red quantum layer 16, the light beam passes through the Filter 17 to improve the Color reproducibility of the light beam. It should be noted that the color of the filter 17 is the same as the color of the quantum layer 16, that is, when the quantum layer 16 is red, the filter 17 is a red filter 17, so that the color reproducibility is higher after the red light beam passing through the red quantum layer 16 passes through the red filter 17 again, thereby further improving the display effect.

Similarly, in order to realize that the sub-pixel emits a green light beam (i.e. forms the green pixel 12), the green quantum layer may be used to cover the blue light source, so that the color of the light beam transmitted through the green quantum layer is changed to green, thereby forming the green pixel 12. In addition, as in the red pixel 11, a green filter 17 may be used to further improve the color reproducibility of the light beam, and it is only necessary to ensure that the color of the filter 17 matches the color of the quantum layer 16. In the above process, the white pixel 14 may be added separately according to the requirement, that is, the sub-pixel emits the white light beam, and when the sub-pixel is used as the white pixel 14, the quantum layer 16 and the optical filter 17 may not be provided, so that the white light beam directly passes through the display screen to be emitted.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An OLED display, comprising:

a back plate;

the substrate is arranged opposite to the back plate;

a pixel group disposed on the backplane towards a side of the substrate;

the electrode layer is arranged on one side, which is far away from the substrate, of the quantum layer of the pixel group and is electrically connected with the pixel group.

2. The OLED display of claim 1, wherein the pixel group comprises a red pixel, a blue pixel, a green pixel and a white pixel, wherein the red pixel, the blue pixel, the green pixel and the white pixel are sequentially spaced in a predetermined order.

3. The OLED display claimed in claim 2, wherein the red pixel, the blue pixel, the green pixel, or the white pixel includes:

an organic light source disposed on the back plate;

a quantum layer disposed on a side of the organic light source facing the substrate and electrically connected to the organic light source;

wherein the light beam emitted by the organic light source transmits through the quantum layer to convert the color of the light beam.

4. The OLED display of claim 3, wherein the organic light source is a white light source comprising a yellow-green light emitting layer and two blue light emitting layers, the yellow-green light emitting layer being disposed between the two blue light emitting layers such that light beams emitted from the yellow-green light emitting layer and the two blue light emitting layers are superimposed to form a white light beam.

5. The OLED display claimed in claim 3, wherein the organic light source is a blue light source including at least one blue light emitting layer.

6. The OLED display claimed in claim 5, wherein the blue light source further includes a green light emitting layer disposed between any two adjacent blue light emitting layers.

7. The OLED display of claim 3, wherein the quantum layers include a red quantum layer and or a green quantum layer.

8. The OLED display device claimed in claim 3, further comprising a filter disposed on the substrate, wherein the quantum layer and the filter are disposed in an overlapping manner in a direction perpendicular to the backplane.

9. The OLED display of claim 8, wherein the filter is a red filter, a green filter, or a blue filter.

10. The OLED display device claimed in claim 1, further comprising a gate power supply disposed on a side of the substrate facing the backplane, the pixel groups being electrically connected to the gate power supply through pixel electrodes.