CN112820762B

CN112820762B - OLED display

Info

Publication number: CN112820762B
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: 2023-04-25
Anticipated expiration: 2040-12-31
Also published as: CN112820762A

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 group is 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 when the OLED display is performed, 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 known as an organic laser display, an organic light Emitting semiconductor (OrganicElectroluminesence Display, OLED). An OLED is a current-type organic light emitting device, which is a phenomenon of emitting light by injection and recombination of carriers, and the intensity of the emitted light is proportional to the current injected. Under the action of an electric field, holes generated by the anode and electrons generated by the cathode of the OLED move, are respectively injected into the hole transport layer and the electron transport layer, and migrate to the light emitting layer. When the two meet at the light emitting layer, an energy exciton is generated, thereby exciting the light emitting molecule to finally generate visible light. However, in the prior art, as the size of the display screen is larger and larger, the tendency of the driving voltage weakening is also 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 an OLED is reduced because the weakening trend of driving voltage is gradually increased when the OLED is driven for displaying in the prior art.

In order to achieve the above objective, 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 group is 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 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, wherein the red pixel, the blue pixel, the green pixel, and the white pixel are sequentially arranged at intervals in a preset order.

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 facing the substrate and is electrically connected with the organic light source; wherein, the light beam emitted by the organic light source penetrates the quantum layer to change 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, so that light beams emitted by the yellow-green light emitting layer and the two blue light emitting layers are superimposed into white light beams.

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

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

Optionally, the quantum layer includes a red quantum layer and/or a green quantum layer.

Optionally, the OLED display further includes an optical filter disposed on the substrate, where the quantum layer and the optical filter are overlapped in a direction perpendicular to the back plate.

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 a side of the substrate facing the back plate, and the pixel group is electrically connected to the gate power supply through a pixel electrode.

According to the technical scheme, the electrode layer is used as the anode to be electrically connected with the pixel group, and when the display is performed, 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 invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained from the structures shown in these drawings without inventive effort for a person skilled in the art.

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

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

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

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

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

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				10	Pixel group	11	Red light pixel
12	Green light 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 board	40	Backboard
				50	Hole transport layer	60	Blue light-emitting layer
70	Electron transport layer	80	Negative charge generating layer
				90	Positive charge generating layer

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

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indications (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indication is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Referring 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), wherein the substrate 30 is disposed opposite to the back plate 40; the pixel group 10 is arranged on the back plate 40 on a side facing the substrate 30, the electrode layer 18 is arranged on the quantum layer 16 on a side facing away from the substrate 30, and the electrode layer 18 is electrically connected with the pixel group 10. The pixel group 10 is disposed on the back plate 40, the light beams emitted from the pixel group 10 are emitted from the substrate 30 (refer to the direction a in fig. 1), the light emitting surface of the pixel group 10 is one side of the substrate 30, that is, the OLED display displays in a back-illuminated manner, and the user observes the image information displayed by combining the pixel groups 10 with different colors through the substrate 30

The electrode layer 18 is used as an anode and is electrically connected with the pixel group 10, and the electrode layer 18 provides a certain voltage for the pixel group 10 and adjusts the current of the pixel group 10; the OLED display further includes a gate power supply 20, the gate power supply 20 is disposed on the side of the substrate 30 facing the back plate 40, and the pixel group 10 is electrically connected to the source and drain electrodes of the gate power supply 20 through pixel electrodes, so as to supply power to the pixel group 10 and send control commands to the pixel group 10.

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 in a preset order; the arrangement order of the red pixel 11, the blue pixel 13, the green pixel 12 and the white pixel 14 may be adjusted, that is, the preset order is the red pixel 11, the blue pixel 13, the green pixel 12 and the white pixel 14 sequentially from left to right, or may be the blue pixel 13, the red pixel 11, the green pixel 12 and the white pixel 14, etc. The order of placement of the red pixels 11, the blue pixels 13, the green pixels 12, and the white pixels 14 does not constitute a limitation of the OLED display structure of the present invention. The sizes of the red pixel 11, the blue pixel 13, the green pixel 12, and the white pixel 14 may be adjusted, and since the light emitting efficiency and the light emitting lifetime of the pixels of various colors are different, the light emitting efficiency of the red pixel 11, the blue pixel 13, the green pixel 12, and the white pixel 14 may be kept the same for ensuring the uniformity of the light, so that the sizes of the pixels may be different, that is, the size of the red pixel 11 may be larger than the size of the blue pixel 13, the size of the green pixel 12 may be larger than the size of the white pixel 14, and so on. 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 needs 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 according to the present invention.

Further, the red pixel 11, the blue pixel 13, the green pixel 12 or the white pixel 14 includes an organic light source 15 and a Quantum Dot (QD), wherein the organic light source 15 is disposed on the back plate 40; the quantum layer 16 is disposed on a side of the organic light source 15 facing the substrate 30 and is electrically connected to the organic light source 15; wherein, the light beam emitted by the organic light source 15 is transmitted through the quantum layer 16 to change 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, and sub-pixels with 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 change 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 changed to red, when the quantum layer 16 is a green quantum layer, the color of the light beam emitted by the organic light source 15 is changed to green, and so on. Meanwhile, the quantum layer 16 can be used for improving the conversion efficiency of the light beam emitted by the organic light source 15, so that the luminous efficiency of the organic light source 15 is indirectly improved, and the color is brighter.

According to the technical scheme, the electrode layer 18 is used as an anode to be electrically connected with the pixel group 10, and when display is performed, 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 configured by a white light source, that is, the color of the light beam emitted by the organic light source 15 is white, and specifically, the white light source includes a Yellow-Green (Yellow-Green) EML layer and two Blue (Blue EML) light emitting layers, and the Yellow-Green light emitting layers are disposed between the two Blue light emitting layers so that the light beams emitted by the Yellow-Green light emitting layers and the two Blue light 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 function is realized by combining the light emitting layers of each color in a specific manner, for example, the light source is realized by stacking the electron transport layer 70 (ETL), the Electron Injection Layer (EIL), the hole transport layer 50 (HTL), the positive charge generation layer (p.cgl), the negative charge generation layer 80 (n.cgl), and the like.

When the white light source is used as the light source, in order to enable the sub-pixel to emit red light (i.e. form the red pixel 11), the red quantum layer may be used to cover the white light source, so that the color of the light beam transmitted through the red quantum layer is converted into red, and the red pixel 11 is formed. In addition, in order to further improve the Color reproduction 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 reproduction 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 a red filter 17, so that after the red light beam passing through the red quantum layer passes through the red filter 17 again, the color reproducibility is higher, and the display effect is further improved.

Similarly, to realize that the sub-pixel emits a green light beam (i.e., forms the green pixel 12), the green sub-layer may be used to cover the white light source, so that the color of the light beam transmitted through the green sub-layer is converted into green, and the green pixel 12 is formed. In addition, as with the red pixel 11, a green filter 17 may be used to further improve the color reproduction of the light beam, so long as the color of the filter 17 is ensured to be consistent with the color of the quantum layer 16.

In practical application, as the conversion efficiency of the blue light beam is high, in this embodiment, referring to fig. 2, it is unnecessary to provide a blue quantum layer to convert the light beam emitted from the white light source, and only a blue filter 17 is provided to filter the light beam into a 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 configured by 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 generating layer (p.cgl), a negative charge generating layer (n.cgl), and the like, which are combined in a specific manner to realize the light emitting function.

In a similar manner, when the blue light source is used as the light source, in order to enable the sub-pixel to emit a red light beam (that is, form 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 transmitted through the red quantum layer is changed into red, and further 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 optical filter 17 is the same as the color of the quantum layer 16, that is, when the quantum layer 16 is red, the optical filter 17 is the red optical filter 17, so that after the red light beam passing through the red quantum layer 16 passes through the red optical filter 17 again, the color reproducibility is higher, and the display effect is further improved.

Similarly, to realize that the sub-pixel emits a green light beam (i.e., forms the green pixel 12), the green sub-layer may be used to cover the blue light source, so that the color of the light beam transmitted through the green sub-layer is converted into green, and the green pixel 12 is formed. In addition, as with the red pixel 11, a green filter 17 may be used to further improve the color reproduction of the light beam, so long as the color of the filter 17 is ensured to be consistent with the color of the quantum layer 16. In the above process, the white light pixel 14 may be added separately according to the requirement, that is, even if the sub-pixel emits a white light beam, when the sub-pixel is used as the white light pixel 14, the quantum layer 16 and the optical filter 17 may not be disposed, so that the white light beam is directly emitted through the display screen.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present description and drawings or direct/indirect application in other related technical fields are included in the scope of the present invention under the inventive concept of the present invention.

Claims

1. An OLED display, the OLED display comprising:

a back plate;

the base plate is arranged opposite to the backboard;

the pixel group is arranged on one side of the backboard, which faces the substrate;

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

the pixel group comprises a red light pixel, a blue light pixel, a green light pixel and a white light pixel, wherein the red light pixel, the blue light pixel, the green light pixel and the white light pixel are sequentially arranged at intervals according to a preset sequence;

the red pixel, the blue pixel, the green pixel, or the white pixel includes:

an organic light source disposed on the back plate;

the quantum layer is arranged on one side of the organic light source facing the substrate and is electrically connected with the organic light source;

the grid power supply is arranged on one side, facing the backboard, of the substrate; the electrode layer is used as an anode and is respectively and electrically connected with the organic light source and the quantum layer, the organic light source and the quantum layer are respectively and electrically connected with a source electrode and a drain electrode of the grid power supply, so that power supplies are provided for the organic light source and the quantum layer, and the current of the organic light source and the quantum layer is regulated;

wherein, the light beam emitted by the organic light source penetrates the quantum layer to change the color of the light beam.

2. The OLED display device claimed in claim 1, wherein the organic light source is a white light source including 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 as a white light beam.

3. The OLED display of claim 1, wherein the organic light source is a blue light source comprising at least one blue light emitting layer.

4. The OLED display of claim 3, wherein the blue light source further comprises a green light emitting layer disposed between any adjacent two of the blue light emitting layers.

5. The OLED display of claim 1, wherein the quantum layers comprise red quantum layers and or green quantum layers.

6. The OLED display device of claim 1, further comprising a filter disposed on the substrate, wherein the quantum layer and the filter are disposed overlapping in a direction perpendicular to the back plane.

7. The OLED display of claim 6, wherein the filter is a red filter, a green filter, or a blue filter.