CN115117223A

CN115117223A - Display panel and display device

Info

Publication number: CN115117223A
Application number: CN202210722430.9A
Authority: CN
Inventors: 刘操; 陈营营
Original assignee: Shanghai Tianma Microelectronics Co Ltd
Current assignee: Shanghai Tianma Microelectronics Co Ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2022-09-27
Anticipated expiration: 2042-06-24
Also published as: CN115117223B

Abstract

The application discloses display panel and display device, this display panel includes the first primary color luminescence unit that is located the base plate, first primary color luminescence unit includes first light-emitting component and covers the first quantum dot layer of first light-emitting component, through set up at least one layer of light regulation layer in the one side that first light-emitting component deviates from the base plate in first quantum dot layer, and light regulation layer includes at least one half reflection zone and at least one total reflection district, and through set up the reflection barricade at the lateral wall surface of first primary color luminescence unit and the surface towards the base plate, make the light that emerges from first light-emitting component transport back and forth in first quantum dot layer, increase the optical path of light in first quantum dot layer, thereby increase the absorptivity quantum of first quantum dot layer to light, and then improve the light conversion efficiency of first quantum dot layer. And further arranging a half reflection region and a full reflection region in the adjacent light adjusting layers to be overlapped in the direction vertical to the surface of the substrate to form a micro-cavity structure, so that the spectrum is narrowed, and the color gamut is improved.

Description

Display panel and display device

Technical Field

The application relates to the technical field of display, in particular to a display panel and a display device.

Background

With the development of display technology, people have higher and higher requirements for display image quality. The Quantum Dot (QD) material used for color conversion in a display panel has the advantages of high brightness, high efficiency, wide color gamut and the like, has a wide application prospect in the display field, but has the problem of low light conversion efficiency. Therefore, how to improve the light conversion efficiency of the quantum dot layer in the display panel has been an urgent technical problem to be solved in the field of quantum dot display.

Disclosure of Invention

In order to solve the above technical problems, embodiments of the present application provide a display panel and a display device to improve the light conversion efficiency of a quantum dot layer in the display panel.

In order to achieve the above object, the embodiments of the present application provide the following technical solutions:

a display panel, comprising:

a substrate;

the light-emitting unit is positioned on the substrate and comprises a first primary color light-emitting unit, the first primary color light-emitting unit comprises a first light-emitting element and a first quantum dot layer covering the first light-emitting element, and the first quantum dot layer is used for converting light emitted by the first light-emitting element into first primary color visible light;

the first quantum dot layer is provided with at least one light ray adjusting layer, the light ray adjusting layer is positioned on one side of the first light-emitting element, which is far away from the substrate, and the light ray adjusting layer comprises at least one semi-reflection region and at least one total reflection region;

the side wall surface of the first primary color light-emitting unit and the surface facing the substrate are provided with reflection retaining walls, and the reflection retaining walls are used for reflecting light emitted to the reflection retaining walls.

A display device comprises the display panel.

Compared with the prior art, the technical scheme has the following advantages:

the display panel provided by the embodiment of the application comprises a first primary color light-emitting unit positioned on a substrate, wherein the first primary color light-emitting unit comprises a first light-emitting element and a first quantum dot layer covering the first light-emitting element, at least one layer of light regulation layer is arranged on one side of the first light-emitting element, which is far away from the substrate, in the first quantum dot layer, the light regulation layer comprises at least one semi-reflection region and at least one total reflection region, so that when light emitted from the first light-emitting element passes through the light regulation layer, one part of the light directly penetrates through the semi-reflection region, the other part of the light is reflected by the semi-reflection region and the total reflection region, the light reflected by the semi-reflection region and the total reflection region enters the first quantum dot layer again to be absorbed, and the light reflected by the semi-reflection region and the total reflection region is transmitted towards the side wall of the first primary color light-emitting unit or towards the substrate, the side wall surface of the first primary color light-emitting unit and the surface facing the substrate are provided with reflection retaining walls for reflecting light emitted to the reflection retaining walls, namely the light emitting device is matched with at least one light adjusting layer arranged in the first quantum dot layer and the reflection retaining walls which semi-surround the first primary color light-emitting unit, so that light emitted from the first light-emitting element is transmitted back and forth in the first quantum dot layer, the optical path of the light in the first quantum dot layer is increased, the absorptivity of the first quantum dot layer to the light is increased, and the light conversion efficiency of the first quantum dot layer is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application 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 application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a conventional display panel using quantum dot layers for color conversion;

fig. 2 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the present disclosure;

fig. 3 is an enlarged cross-sectional view of a display panel according to an embodiment of the present application, illustrating a first primary color light-emitting unit;

fig. 4(a) -4 (b) are schematic top views of two light adjusting layers disposed in a first quantum dot layer of a first primary light emitting unit in a display panel provided in an embodiment of the present application;

FIG. 5 is a schematic top view of a light adjusting layer disposed in a first quantum dot layer of a first primary light-emitting unit in a display panel according to an embodiment of the present disclosure;

FIG. 6 is a schematic top view of another light adjusting layer disposed in a first quantum dot layer of a first primary light emitting unit in a display panel according to an embodiment of the present disclosure;

FIG. 7 is a schematic top view of another light adjusting layer disposed in a first quantum dot layer of a first primary light-emitting unit in a display panel according to an embodiment of the present disclosure;

FIG. 8 is a schematic top view of another light adjusting layer disposed in a first quantum dot layer of a first primary light-emitting unit in a display panel according to an embodiment of the present disclosure;

fig. 9 is a schematic top view illustrating another light adjusting layer disposed in the first quantum dot layer of the first primary light emitting unit in the display panel according to the embodiment of the present disclosure;

FIG. 10 is a schematic top view of another light adjusting layer disposed in a first quantum dot layer of a first primary light-emitting unit in a display panel according to an embodiment of the present disclosure;

FIG. 11 is a schematic diagram illustrating an enlarged cross-sectional structure of a first primary color light-emitting unit in a display panel according to another embodiment of the present application;

FIG. 12 is a schematic top view of two adjacent light adjusting layers disposed in a first quantum dot layer of a first primary light emitting unit in a display panel according to an embodiment of the present disclosure;

fig. 13 is a schematic top view illustrating an odd light adjusting layer and an even light adjusting layer disposed in a first quantum dot layer of a first primary light emitting unit in a display panel according to an embodiment of the present disclosure;

FIG. 14 is a schematic diagram illustrating an enlarged cross-sectional structure of a second primary color light-emitting unit in a display panel according to an embodiment of the present application;

fig. 15 is a schematic cross-sectional view illustrating a display panel according to another embodiment of the present application;

FIG. 16 is a schematic diagram illustrating an enlarged cross-sectional structure of a light-emitting unit of a third primary color in a display panel according to another embodiment of the present application;

fig. 17 is a schematic structural diagram of a display device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited to the specific embodiments disclosed below.

Next, the present application will be described in detail with reference to the drawings, and in the detailed description of the embodiments of the present application, the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration, and the drawings are only examples, which should not limit the scope of the protection of the present application. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

As described in the background section, how to improve the light conversion efficiency of the quantum dot layer in the display panel has been an urgent technical problem to be solved in the field of quantum dot display.

Fig. 1 is a schematic cross-sectional view of a display panel using a quantum dot layer for color conversion in the prior art, and as can be seen from fig. 1, the display panel comprises a circuit substrate 010 and a plurality of pixels 020 on the circuit substrate 010, wherein, in red pixel 021, the blue light emitted from backlight source 01 excites red light quantum dot layer 02 to generate red light, in green pixel 022, the blue light emitted from backlight source 01 excites green light quantum dot layer 03 to generate green light, in blue pixel 023, the blue light emitted from backlight source 01 passes through scattering layer 04 and then directly emits out, as can be seen, the red quantum dot layer 02 is used to convert the blue light emitted from the backlight 01 into red light, the green quantum dot layer 03 is used to convert the blue light emitted from the backlight 01 into green light, the scattering layer 04 is used to increase the exit angle of the blue light, namely, the backlight source 01, the red light quantum dot layer 02 and the green light quantum dot layer 03 are matched to realize the full-color display of the display panel.

The inventors have found that, during the transmission of light from the backlight 01 in the quantum dot layer 02/03, if the light misses the quantum dot material, the light will continue to be transmitted in the original direction; if the light hits the quantum dot material but is not absorbed by the quantum dot material, the light is scattered, and the light is transmitted continuously after the direction is changed; if absorbed by the quantum dot material, it will excite visible light of a predetermined color, i.e., the light emitted from the backlight 01 is transmitted and absorbed in the quantum dot layer 02/03, so that in order for the quantum dot layer 02/03 to absorb one hundred percent of the light emitted from the backlight 01, the quantum dot layer 02/03 needs to be thick enough, at least 15 μm or more,

however, as shown in fig. 1, the space between adjacent pixels 020 is usually blocked by the retaining wall 030, and since the retaining wall 030 is formed by photolithography and is limited by the aspect ratio, the thickness of the retaining wall 030 can only be below 15 μm at present, which limits the thickness of the quantum dot layer 02/03 to only below 15 μm, in this case, the absorption rate of the quantum dot layer 02/03 to the light emitted by the backlight 01 is low, which causes the loss of the light emitted by the backlight 01, and the conversion efficiency of the quantum dot layer 02/03 to the light emitted by the backlight 01 is low.

The display panel shown in fig. 1 further includes an encapsulation layer 040, a filter layer 050, an opaque layer 060, and a protective glass/film 070, where the color of light transmitted through the filter layer 50 differs for each pixel.

Based on the above research, an embodiment of the present application provides a display panel, as shown in fig. 2, including:

a substrate 100;

a light emitting unit 200 on the substrate 100, the light emitting unit 200 including a first primary color light emitting unit 210, the first primary color light emitting unit 210 including a first light emitting element 211 and a first quantum dot layer 212 covering the first light emitting element 211, the first quantum dot layer 212 for converting light emitted from the first light emitting element 211 into a first primary color visible light;

at least one light adjusting layer 300 is disposed in the first quantum dot layer 212, the light adjusting layer 300 is located on a side of the first light emitting element 211 away from the substrate 100, and the light adjusting layer 300 includes at least one semi-reflective region 310 and at least one total-reflective region 320;

the side wall surface of the first primary color light emitting unit 210 and the surface facing the substrate 100 are provided with a reflective wall 400, and the reflective wall 400 is used for reflecting the light emitted to the reflective wall 400.

Optionally, the first primary color visible light may be any one of red light, green light and blue light, and the application does not limit the specific primary color visible light of the first primary color visible light, as the case may be. When the first primary color visible light is red light or green light, the first light emitting element 211 may be a blue LED or an ultraviolet LED, so as to perform color conversion on light emitted from the blue LED or the ultraviolet LED through the first quantum dot layer 212 to convert the light into the first primary color visible light; when the first primary color visible light is blue light, the first light emitting element 211 may be an ultraviolet LED to perform color conversion on light emitted from the ultraviolet LED through the first quantum dot layer 212 into the first primary color visible light.

Fig. 3 is an enlarged cross-sectional view of the first primary color light emitting unit 210 in the display panel shown in fig. 2, as shown in fig. 3, light emitted from the first light emitting element 211 is transmitted in the first quantum dot layer 212, and absorbed and converted into visible light of the first primary color, and during the transmission of the light emitted from the first light emitting element 211 in the first quantum dot layer 212, the light passes through at least one light adjusting layer 300 disposed in the first quantum dot layer 212, since each light adjusting layer 300 includes at least one semi-reflective region 310 and at least one total-reflective region 320, most of the light incident to the semi-reflective region 310 passes through the semi-reflective region 310, and a small part of the light is reflected by the semi-reflective region 310, as shown by the solid arrows in fig. 3, while all of the light incident to the total-reflective region 320 is reflected by the total-reflective region 320, as shown by the dashed arrows in fig. 3, that is the semi-reflective region 310 keeps the light continuously transmitted in the direction away from the substrate 100, and the light reflected by the semi-reflective region 310 and the total-reflective region 320 enters the first quantum dot layer 212 again for absorption.

As shown in fig. 3, since the light adjusting layer 300 is disposed on a side of the first quantum dot layer 212, which is away from the substrate, of the first light emitting element 211, light emitted from the first light emitting element 211 is reflected by the semi-reflective region 310 and the total-reflective region 320 in the light adjusting layer 300 and is transmitted toward the sidewall of the first primary color light emitting unit or toward the substrate 100, in this embodiment, a reflective barrier 400 is further disposed on both the sidewall surface of the first primary color light emitting unit 210 and the surface facing the substrate 100, so that when the light reflected by the semi-reflective region 310 and the total-reflective region 320 is emitted to the reflective barrier 400, the light is reflected by the reflective barrier 400 and enters the first quantum dot layer 212 again to be absorbed.

Moreover, the reflective barriers 400 can also reflect the light directly emitted from the first light-emitting elements 211, for example, the light directly emitted from the first light-emitting elements 211 and emitted toward the substrate 100 can be reflected by the reflective barriers 400 located on the surface of the first primary color light-emitting unit 210 facing the substrate 100, so that the light is emitted in a direction away from the substrate 100. For another example, light emitted directly from the first light emitting element 211 toward the sidewall of the first primary color light emitting unit 210 may be reflected by the reflective wall 400 on the sidewall surface of the first primary color light emitting unit 210, so that the light enters the first quantum dot layer 212 again to be absorbed. For another example, the light emitted from the first light emitting element 211 passing through the semi-reflective region 310 in the light adjusting layer 300 may also be emitted to the sidewall of the first primary color light emitting unit 210 and reflected by the reflective wall 400 on the sidewall surface of the first primary color light emitting unit 210, so that the light enters the first quantum dot layer 212 again and is absorbed.

Therefore, in the display panel provided in the embodiment of the present application, at least one light ray adjusting layer 300 is disposed in the first quantum dot layer 212 of the first primary light emitting unit 210 on a side of the first light emitting element 211 facing away from the substrate 100, and the light ray adjusting layer 300 includes at least one semi-reflective region 310 and at least one total-reflective region 320, and the reflective barriers 400 are disposed on the sidewall surface of the first primary light emitting unit 210 and the surface facing the substrate 100, so that light emitted from the first light emitting element 211 is transmitted back and forth in the first quantum dot layer 212, and the optical path of the light in the first quantum dot layer 212 is increased, thereby increasing the absorption rate of the first quantum dot layer 212 to the light, and further improving the light conversion efficiency of the first quantum dot layer 212.

It should be emphasized that if the reflection barriers 400 are only disposed on the sidewall surface of the first primary color light emitting unit 210 and the surface facing the substrate 100, and the light adjusting layer 300 is not disposed in the first quantum dot layer 212, the light emitted from the first light emitting element 211 usually passes through the first quantum dot layer 212 in a shorter path, and the absorption rate of the light emitted from the first light emitting element 211 by the first quantum dot layer 212 is still lower, resulting in the light conversion efficiency of the first quantum dot layer 212 still being lower.

On the basis of the above embodiments, optionally, in an embodiment of the present application, the light ray adjustment layer 300 includes a semi-reflective region 310 and a total-reflective region 320, and fig. 4(a) and 4(b) show two distribution diagrams of the light ray adjustment layer 300 including a semi-reflective region 310 and a total-reflective region 320.

In this embodiment, the semi-reflective region 310 and the total-reflective region 320 may have the same area or different areas, for example, the area of the semi-reflective region 310 is larger than the area of the total-reflective region 320, so as to ensure that the light emitted from the first light-emitting device 211 is emitted in a direction away from the substrate 100.

In this embodiment, the positions of the semi-reflective region 310 and the total-reflective region 320 may be set left and right, for example, the semi-reflective region 310 is located on the left side, and the total-reflective region 320 is located on the right side, as shown in fig. 4 (a); it can also be arranged up and down, for example, the semi-reflective region 310 is located at the upper side, and the total-reflective region 320 is located at the lower side; or an enclosing and surrounding arrangement, for example, the semi-reflective region 310 is located in the central region of the light ray adjustment layer 300, and the total-reflective region 320 encloses the semi-reflective region 310, as shown in fig. 4(b), or the total-reflective region 320 is located in the central region of the light ray adjustment layer 300, and the semi-reflective region 310 encloses the total-reflective region 320. Here, the left-right setting and the up-down setting are explained as the left-right and the up-down in fig. 4 (a).

In the present embodiment, the shapes of the semi-reflective region 310 and the total-reflective region 320 may also be determined according to actual situations. In summary, the present application does not limit the area, shape and position relationship of the semi-reflective region 310 and the total-reflective region 320 in the light adjusting layer 300, as the case may be.

It is understood that, when the light adjusting layer 300 includes only one semi-reflective region 310 and one total-reflective region 320, the light incident on the semi-reflective region 310 is mostly transmitted, a small portion is reflected, and the light incident on the total-reflective region 320 is totally reflected, which may result in non-uniform light emission.

In consideration of the uniformity of the emitted light of the first primary color light-emitting unit, optionally, in another embodiment of the present application, in the light adjusting layer 300, at least one semi-reflective region includes a plurality of semi-reflective regions 310, at least one total-reflective region includes a plurality of total-reflective regions 320, and the semi-reflective regions 310 and the total-reflective regions 320 are alternately arranged along a first direction, which is parallel to the surface of the substrate 100. In the present embodiment, the first direction is not limited to any specific direction, and any direction parallel to the surface of the substrate 100 may be used.

Fig. 5 is a schematic top view of a light adjusting layer 300 disposed in a first quantum dot layer 212 of a first primary light emitting unit 210 in a display panel provided by an embodiment of the present application, and it can be seen from fig. 5 that within the light adjusting layer 300, semi-reflective regions 310 and total-reflective regions 320 are alternately arranged only along a first direction.

In this embodiment, the semi-reflective regions 310 and the total-reflective regions 320 are alternately arranged along the first direction, such that in the first direction, a portion of the light is transmitted by the semi-reflective regions 310, a portion of the light is reflected by the semi-reflective regions 310 and the total-reflective regions 320 (mainly by the total-reflective regions 320), and the transmitted light and the reflected light are alternately arranged, such that the light emitted from the first primary color light emitting unit 210 in the first direction is relatively uniform. However, in the direction perpendicular to the first direction, the semi-reflective region 310 still transmits most of the light, and the total-reflective region 320 reflects all of the light, i.e. there is still a phenomenon of non-uniform light output.

Fig. 6 is a schematic top view of another light adjusting layer 300 disposed in the first quantum dot layer 212 of the first primary light emitting unit 210 in the display panel provided in the embodiment of the present application, as shown in fig. 6, the light adjusting layer 300 includes a plurality of semi-reflective regions 311 and a plurality of second semi-reflective regions 312 (indicated by dashed boxes in fig. 6), the light adjusting layer 300 includes a plurality of rows formed by alternately arranging the first semi-reflective regions 311 and the total-reflective regions 320 along a first direction, and two adjacent rows are separated by one second semi-reflective region 312;

the first semi-reflective regions 311 in two adjacent rows in the light adjusting layer 300 are in one-to-one correspondence, and the total reflective regions 320 in two adjacent rows are in one-to-one correspondence.

In the present embodiment, in each row formed by the first semi-reflective regions 311 and the total-reflective regions 320 alternately arranged along the first direction in the light adjusting layer 300, the first semi-reflective regions 311 and the total-reflective regions 320 are alternately arranged, so that the light is emitted more uniformly. However, the second semi-reflective regions 312 spaced in rows still have the problem of non-uniform light emission.

It should be noted that, in fig. 6, the first semi-reflective region 311 and the second semi-reflective region 312 are the integrally formed semi-reflective region 310, and in this embodiment, the semi-reflective region 310 is divided into the first semi-reflective region 311 and the second semi-reflective region 312, so as to show that the areas of the first semi-reflective region 311 and the second semi-reflective region 312 are different and the positions are different. The arrangement in fig. 6 can also be regarded as that in the light adjusting layer, the total reflection regions 320 are arranged in an array at intervals, and the rest regions are the semi-reflection regions 310.

Similarly, fig. 7 is a schematic top view of another light adjusting layer 300 disposed in the first quantum dot layer 212 of the first primary color light emitting unit 210 in the display panel provided in the embodiment of the present disclosure, as shown in fig. 7, the plurality of total reflection regions in the light adjusting layer 300 include a plurality of first total reflection regions 321 and a plurality of second total reflection regions 322, the light adjusting layer 300 includes a plurality of rows formed by alternately arranging the semi-reflection regions 310 and the first total reflection regions 321 along the first direction, and two adjacent rows are separated by one second total reflection region 322;

the semi-reflective regions 310 in two adjacent rows in the light adjusting layer 300 correspond to each other, and the first total-reflective regions 321 in two adjacent rows correspond to each other.

In the present embodiment, in each row formed by the semi-reflective regions 310 and the first total-reflective regions 321 alternately arranged along the first direction in the light adjusting layer 300, the semi-reflective regions 310 and the first total-reflective regions 321 are alternately arranged, so that the light is emitted more uniformly. However, the second total reflection regions 322 in different rows still have the problem of non-uniform light emission.

It should be noted that, in fig. 7, first total reflection area 321 and second total reflection area 322 are total reflection area 320 formed integrally, and in this embodiment, total reflection area 320 is divided into first total reflection area 321 and second total reflection area 322, so as to show that first total reflection area 321 and second total reflection area 322 have different areas and different positions. The arrangement in fig. 7 can also be regarded as that in the light adjusting layer, the semi-reflective regions 310 are arranged in a spaced array, and the rest of the regions are all the total-reflective regions 320.

Further, fig. 8 is a schematic top view of another light adjusting layer 300 disposed in the first quantum dot layer 212 of the first primary color light emitting unit 210 in the display panel provided in the embodiment of the present application, and as can be seen from fig. 8, the light adjusting layer 300 includes a plurality of rows formed by alternately arranging semi-reflective regions 310 and total-reflective regions 320 along a first direction, and the rows are sequentially arranged along a second direction, the second direction is parallel to the surface of the substrate 100 and is perpendicular to the first direction;

the semi-reflective regions 310 in two adjacent rows in the light adjusting layer 300 are arranged in a staggered manner, and the total-reflective regions 320 in two adjacent rows are arranged in a staggered manner.

In this embodiment, the light adjusting layer 300 is arranged in a first direction, the semi-reflective regions 310 and the total-reflective regions 320 are alternately arranged, and in a second direction perpendicular to the first direction, the semi-reflective regions 310 and the total-reflective regions 320 are also alternately arranged, so that the total-reflective regions 320 are all disposed around one semi-reflective region 310, and the semi-reflective regions 310 are also disposed around one total-reflective region 320, thereby making the light emission more uniform.

On the basis of the foregoing embodiment, optionally, in an embodiment of the present application, as shown in fig. 8, in the second direction, the center of the semi-reflective region 310 in the ith row is aligned with the center of the total-reflective region 320 in the (i + 1) th row, the center of the total-reflective region 320 in the ith row is aligned with the center of the semi-reflective region 310 in the (i + 1) th row, and i is an integer not less than 1. That is, in the present embodiment, the semi-reflective regions 310 and the total-reflective regions 320 in the light adjusting layer 300 form an array checkerboard arrangement, so as to further increase the uniformity of the emitted light.

Further, considering that the light ray adjustment layer 300 disposed in the first quantum dot layer 212 may be a multilayer, then the area of the semi-reflective region 310 in some light ray adjustment layers 300 may be set larger than the area of the total-reflective region 320, and the area of the total-reflective region 320 in some light ray adjustment layers 300 may be set larger than the area of the semi-reflective region 310, and therefore, optionally, in an embodiment of the present application, as shown in fig. 8 to 10, in the ith row in the light ray adjustment layer 300, the width w1 of the semi-reflective region 310 in the second direction is equal to the width w2 of the total-reflective region 320 in the second direction, and the length d1 of the semi-reflective region 310 between adjacent total-reflective regions 320 in the first direction is greater than, equal to, or less than the length d2 of the total-reflective region 320 in the first direction.

In the present embodiment, in the ith row of the light adjusting layer 300, the length d1 of the semi-reflective region 310 between adjacent total reflective regions 320 along the first direction is specifically greater than, equal to, or less than the length d2 of the total reflective regions 320 along the first direction, which may be determined by the requirement of the transmitted light of the light adjusting layer 300.

Specifically, in one embodiment of the present application, if more transmitted light rays are intended to be incident to the light ray adjustment layer 300 than reflected light rays, in the ith row within the light ray adjustment layer 300, the length d1 of the semi-reflective region 310 between adjacent total-reflective regions 320 in the first direction may be greater than the length d2 of the total-reflective regions 320 in the first direction, as shown in fig. 9;

in another embodiment of the present application, if the transmitted light intended to be incident to the light ray adjustment layer 300 is equivalent to the reflected light, in the ith row within the light ray adjustment layer 300, the length d1 of the semi-reflective region 310 between adjacent total reflective regions 320 in the first direction may be equal to the length d2 of the total reflective regions 320 in the first direction, as shown in fig. 8;

in still another embodiment of the present application, if the transmitted light intended to be incident to the light ray adjustment layer 300 is less than the reflected light, the length d1 of the semi-reflective region 310 between the adjacent total reflective regions 320 in the first direction may be less than the length d2 of the total reflective regions 320 in the first direction, as shown in fig. 10, as the case may be.

It should be noted that, in the ith row in the light ray adjusting layer 300 shown in fig. 9, the length of the semi-reflective region 310 in the first direction may also be equal to or less than the length of the total-reflective region 320 in the first direction, and in the ith row in the light ray adjusting layer 300 shown in fig. 10, the length of the total-reflective region 320 in the first direction may also be equal to or less than the length of the semi-reflective region 310 in the first direction, but these places are distributed at the boundary portion of the light ray adjusting layer 300 and do not affect the arrangement of the whole semi-reflective region 310 and the total-reflective region 320.

It should be further noted that, in the light ray adjusting layer 300 shown in fig. 9 and 10, in order to clearly show the distribution of the semi-reflective regions 310 and the total-reflective regions 320, some dotted lines are added to correspond to serial numbers of each row, but it should be understood that each semi-reflective region 310 in fig. 9 is an integrally formed region, the arrangement in fig. 9 may be regarded as that in the light ray adjusting layer 300, the total-reflective regions 320 are arranged at intervals along a first direction to form a plurality of rows, and each row is arranged in sequence along a second direction, the total-reflective regions 320 in two adjacent rows are arranged in a staggered manner, and the remaining regions are the semi-reflective regions 310; each total reflection region 320 in fig. 10 is an integrally formed region, and the arrangement in fig. 10 can be regarded as that in the light ray adjustment layer 300, the semi-reflection regions 310 are arranged at intervals along the first direction to form a plurality of rows, and each row is arranged in sequence along the second direction, the semi-reflection regions 310 in two adjacent rows are arranged in a staggered manner, and the remaining regions are all the total reflection regions 320.

It should be noted that, in the above embodiments, specific shapes of the semi-reflective region 310 and the total-reflective region 320 in the light ray adjustment layer 300 are not limited, and fig. 4(a) -4 (b) and fig. 5-10 all illustrate the semi-reflective region 310 and the total-reflective region 320 as rectangles, and in other embodiments of the present application, the semi-reflective region 310 and/or the total-reflective region 320 may also be other shapes such as circles or polygons, as the case may be.

Alternatively to any of the above embodiments, in an embodiment of the present application, as shown in fig. 11, at least one of the light adjustment layers in the first quantum dot layer 212 includes at least two light adjustment layers 300 arranged in sequence in a direction away from the substrate 100;

the orthographic projection of the semi-reflective region 310 in the j-th layer of the light adjusting layer 300 on the surface of the substrate 100 is at least partially overlapped with the orthographic projection of the total reflective region 320 in the j + 1-th layer of the light adjusting layer 300 on the surface of the substrate 100, the orthographic projection of the total reflective region 320 in the j-th layer of the light adjusting layer 300 on the surface of the substrate 100 is at least partially overlapped with the orthographic projection of the semi-reflective region 310 in the j + 1-th layer of the light adjusting layer 300 on the surface of the substrate 100, and j is an integer not less than 1.

In the present embodiment, an orthogonal projection of the semi-reflective region 310 in the j-th layer light-adjusting layer 300 on the surface of the substrate 100 at least partially overlaps an orthogonal projection of the total-reflective region 320 in the j + 1-th layer light-adjusting layer 300 on the surface of the substrate 100, that is, the semi-reflective region 310 in the j-th layer light-adjusting layer 300 and the total-reflective region 320 in the j + 1-th layer light-adjusting layer 300 have overlapping portions in a direction perpendicular to the surface of the substrate 100;

similarly, the orthographic projection of the total reflection region 320 in the j-th layer of the light adjusting layer 300 on the surface of the substrate 100 and the orthographic projection of the semi-reflection region 310 in the j + 1-th layer of the light adjusting layer 300 on the surface of the substrate 100 at least partially overlap, that is, the total reflection region 320 in the j-th layer of the light adjusting layer 300 and the semi-reflection region 310 in the j + 1-th layer of the light adjusting layer 300 have overlapping portions in the direction perpendicular to the surface of the substrate 100;

since the light incident to the semi-reflective region 310 can be partially reflected and the light incident to the total-reflective region 320 can be totally reflected, the overlapping portion of the semi-reflective region 310 in the j-th light-adjusting layer and the total-reflective region 320 in the j + 1-th layer in the direction perpendicular to the surface of the substrate 100 forms a microcavity structure, and the overlapping portion of the total-reflective region 320 in the j-th light-adjusting layer and the semi-reflective region 310 in the j + 1-th layer in the direction perpendicular to the surface of the substrate 100 also forms a microcavity structure, according to the microcavity effect, when the cavity length dimension (i.e., the distance between adjacent quantum dot layers 300) of the microcavity structure is in the same order as the wavelength of the light wave, the light with a specific wavelength interferes and the spectrum is narrowed.

Therefore, in the present embodiment, the half reflection regions 310 and the total reflection regions 320 in the adjacent light adjustment layers 300 are at least partially overlapped in the direction perpendicular to the surface of the substrate 100 to form a micro-cavity structure, and the distance between the adjacent light adjustment layers 300 can be set, so that the half-peak width of the emergent light of the first primary color light emitting unit is narrowed, thereby improving the color gamut of the display panel.

It should be noted that, referring to fig. 11, the first quantum dot layer 212 may be an inverted trapezoid structure, and at this time, the cross-sectional area of the first quantum dot layer 212 gradually increases along the direction away from the substrate 100, and then, the area of each light adjustment layer 300 gradually increases along the direction away from the substrate 100, and in this embodiment, when the area of the j-th light adjustment layer 300 is smaller than the area of the j + 1-th light adjustment layer 300, in the direction perpendicular to the substrate 100 surface, in the overlapping region of the j-th light adjustment layer 300 and the j + 1-th light adjustment layer 300, the orthographic projection of the semi-reflective region 310 in the j-th light adjustment layer 300 on the substrate 100 surface and the orthographic projection of the total reflective region 320 in the j + 1-th light adjustment layer 300 on the substrate 100 surface at least partially overlap, and the orthographic projection of the total reflective region 320 in the j + 1-th light adjustment layer 300 on the substrate 100 surface and the orthographic projection of the semi-reflective region 310 in the j + 1-th light adjustment layer 300 on the substrate 100 surface The shadows overlap at least partially.

It should be further noted that, in the present application, there is no limitation on whether the semi-reflective region 310 and the total-reflective region 320 in the adjacent light-adjusting layers 300 form a micro-cavity structure in the direction perpendicular to the surface of the substrate 00, in other embodiments of the present application, the semi-reflective region 310 and the total-reflective region 320 in the adjacent light-adjusting layers 300 may not overlap in the direction perpendicular to the surface of the substrate 100, for example, the arrangement of the semi-reflective region 310 and the total-reflective region 320 in each light-adjusting layer 300 is the same, which is determined by the specific situation.

Further, on the basis of the above-mentioned embodiments, optionally, in an embodiment of the present application, as shown in fig. 11, an orthogonal projection of the semi-reflective region 310 in the j-th layer light-adjusting layer 300 on the surface of the substrate 100 coincides with an orthogonal projection of the total-reflective region 320 in the j + 1-th layer light-adjusting layer 300 on the surface of the substrate 100, and an orthogonal projection of the total-reflective region 320 in the j-th layer light-adjusting layer 300 on the surface of the substrate 100 coincides with an orthogonal projection of the semi-reflective region 310 in the j + 1-th layer light-adjusting layer 300 on the surface of the substrate 100.

Specifically, in order to clearly reveal the correspondence between the semi-reflective regions 310 and the total-reflective regions 320 between the adjacent light adjusting layers 300, fig. 12 shows a schematic top view of two adjacent light ray adjusting layers 300, as shown in fig. 12, in the present embodiment, the semi-reflective region 310 in the j-th layer light ray regulation layer 300 and the total reflective region 320 in the j + 1-th layer light ray regulation layer 300 are completely overlapped in the direction perpendicular to the substrate surface, the total reflective region 320 in the j-th layer light ray regulation layer 300 and the semi-reflective region 310 in the j + 1-th layer light ray regulation layer 300 are completely overlapped in the direction perpendicular to the substrate surface, therefore, a microcavity structure with a larger area is formed, the half-peak width of emergent light of the first primary color light-emitting unit is further narrowed, and the color gamut of the display panel is further improved.

On the basis of the above embodiments, optionally, in an embodiment of the present application, as shown in fig. 12, in the light adjusting layer 300 of the j-th layer, the area of each semi-reflective region 310 is equal to the area of each total-reflective region 320, that is, in the light adjusting layer 300 of the j-th layer, the area of each semi-reflective region 310 is equal to the area of each total-reflective region 320, and the semi-reflective regions 310 of the light adjusting layer 300 of the j-th layer, the total-reflective regions 320 of the light adjusting layer 300 of the j + 1-th layer and the total-reflective regions 320 of the light adjusting layer 300 of the j-th layer form micro-cavity structures in one-to-correspondence with the semi-reflective regions 310 of the light adjusting layer 300 of the j + 1-th layer and the total-reflective regions 320 of the light adjusting layer 300 of the j-1-th layer, the emergent light of the first primary color light-emitting unit is more uniform, the half-peak width of the emergent light of the first primary color light-emitting unit is further narrowed, and the color gamut of the display panel is further improved.

On the basis of any of the above embodiments, optionally, in an embodiment of the present application, in the mth layer of light ray adjustment layer 300, the total area of each semi-reflective region 310 is greater than the total area of each total-reflective region 320, and m is an odd number not less than 1;

in the nth light adjusting layer 300, the total area of each semi-reflective region 310 is smaller than or equal to the total area of each total-reflective region 320, and n is an even number not smaller than 1.

In this embodiment, in a direction away from the substrate 100, the total area of each semi-reflective region 310 in the odd-numbered light ray adjustment layer 300 is greater than the total area of each total-reflective region 320, so that more light rays incident on the odd-numbered light ray adjustment layer 300 penetrate through the odd-numbered light ray adjustment layer, and it is ensured that the light rays emitted from the first light-emitting element 211 are emitted in a direction away from the substrate 100 as a whole, specifically, for example, the arrangement of the semi-reflective regions 310 and the total-reflective regions 320 in the odd-numbered light ray adjustment layer 300 is as shown in the arrangement in fig. 9, and of course, each total-reflective region 320 and each semi-reflective region 310 in the odd-numbered light ray adjustment layer 300 also reflect light rays;

in the direction away from the substrate 100, the total area of each semi-reflective region 310 in the even-numbered light ray adjustment layer 300 is smaller than or equal to the total area of each total-reflective region 320, that is, the total area of each total-reflective region 320 in the even-numbered light ray adjustment layer 300 is larger than or equal to the total area of each semi-reflective region 310, so that the light rays incident into the even-numbered light ray adjustment layer 300 are sufficiently or more reflected to increase the optical path length of the light rays in the first quantum dot layer 212 and increase the absorption rate of the light rays by the first quantum dot layer 212, for example, the arrangement of the semi-reflective regions 310 and the total-reflective regions 320 in the even-numbered light ray adjustment layer 300 is as shown in the arrangement in fig. 8 or fig. 10, and of course, each semi-reflective region 310 in the even-numbered light ray adjustment layer 300 also transmits the light rays.

In order to more clearly show the corresponding relationship between the semi-reflective regions 310 and the total-reflective regions 320 between the light ray adjustment layers of the odd number layers and the light ray adjustment layers of the even number layers, fig. 13 shows the arrangement of the light ray adjustment layers 300 of the odd number layers as shown in fig. 9, and the arrangement of the light ray adjustment layers 300 of the even number layers as shown in fig. 8.

On the basis of any of the above embodiments, optionally, in an embodiment of the present application, as shown in fig. 11, the arrangement of the semi-reflective region 310 and the total-reflective region 320 in the j-th light adjusting layer 300 is the same as the arrangement of the semi-reflective region 310 and the total-reflective region 320 in the j + 2-th light adjusting layer 300, that is, in the direction away from the substrate 100, the arrangement of the semi-reflective region 310 and the total-reflective region 320 in the 1-th light adjusting layer 300 is the same as the arrangement of the semi-reflective region 310 and the total-reflective region 320 in the 3-rd light adjusting layer 300, the arrangement of the semi-reflective region 310 and the total-reflective region 320 in the 2-th light adjusting layer 300 is the same as the arrangement of the semi-reflective region 310 and the total-reflective region 320 in the 4-th light adjusting layer 300, and so on, which the process can be simplified. However, the present application does not limit this, and in other embodiments of the present application, the arrangement of the semi-reflective region 310 and the total-reflective region 320 in each light adjusting layer 300 may be different, as the case may be.

As is known from the foregoing, when the cavity length (i.e., the distance between the adjacent light-adjusting layers) of the microcavity structure formed by the semi-reflective region 310 and the total-reflective region 320 between the adjacent light-adjusting layers 300 is the same as the wavelength of the emergent light wave, the emergent light will interfere with each other, and the spectrum of the emergent light will be narrowed, so that for the emergent light with different colors, the distance between the adjacent light-adjusting layers 300 in the quantum dot layer needs to be designed differently.

Optionally, in an embodiment of the present application, as shown in fig. 2 and fig. 14, the light emitting unit 200 further includes a second primary color light emitting unit 220, the second primary color light emitting unit 220 includes a second light emitting element 221 and a second quantum dot layer 222 covering the second light emitting element, the second quantum dot layer 222 is configured to convert light emitted from the second light emitting element into visible light of a second primary color;

at least one light adjusting layer 300 is disposed on a side of the second quantum dot layer 222, which faces away from the substrate 100, of the second light emitting element 221;

the sidewall surface of the second primary color light emitting unit 220 and the surface facing the substrate 100 are provided with reflective barriers 400;

in the present embodiment, the first primary color is red light, and the second primary color is green light, and as can be seen from a comparison of fig. 11 and 14, the interval between the adjacent light adjusting layers 300 in the first quantum dot layer 212 is greater than the interval between the adjacent light adjusting layers 300 in the second quantum dot layer 222.

In the present embodiment, since red light is longer than green light wavelength, it is necessary to set the interval between the adjacent light adjustment layers 300 in the first quantum dot layer 212 to be larger than the interval between the adjacent light adjustment layers 300 in the second quantum dot layer 222. For example, with the first quantum dot layer 212 and the second quantum dot layer 222 having the same thickness, as shown in fig. 11, 3 layers of light adjusting layers 300 are provided in the first quantum dot layer 212, and as shown in fig. 12, 4 layers of light adjusting layers are provided in the second quantum dot layer 222.

In this embodiment, both the first light emitting element 211 and the second light emitting element 221 may be blue LEDs or ultraviolet LEDs, that is, for the red light emitting unit (the first primary color light emitting unit 210) and the green light emitting unit (the second primary color light emitting unit 220), both the blue LEDs and the ultraviolet LEDs may be used as backlight sources to excite a quantum dot layer to perform color conversion, and emit corresponding red light and green light, specifically, the LEDs may be OLEDs, Mini LEDs, or Micro LEDs.

On the basis of the above embodiments, optionally, in an embodiment of the present application, as shown in fig. 2, the light emitting unit 200 further includes a third primary color light emitting unit 230, and the third primary color light emitting unit 230 includes a third light emitting element 231 and a light scattering layer 232 covering the third light emitting element, in this case, when the first light emitting element 211, the second light emitting element 221 and the third light emitting element 231 are all blue LEDs, blue light emitted by the third light emitting element 231 can directly penetrate through the light scattering layer 232 to be emitted, that is, a quantum dot layer is not required to be disposed in the third primary color light emitting unit 230, where the light scattering layer 232 is used for improving the blue light emitting viewing angle.

Optionally, in another embodiment of the present application, as shown in fig. 15, the light emitting unit 200 further includes a third primary color light emitting unit 230, the third primary color light emitting unit 230 includes a third light emitting element 231 and a third quantum dot layer 233 covering the third light emitting element, the third quantum dot layer 233 is used for converting light emitted from the third light emitting element 231 into visible light of a third primary color;

at least one light regulation layer 300 is arranged on one side of the third light-emitting element 231 in the third quantum dot layer 233, which is far away from the substrate;

the sidewall surface of the third primary color light emitting unit 230 and the surface facing the substrate 100 are provided with reflective barriers 400;

in the present embodiment, the visible light of the third primary color is blue light, fig. 16 is an enlarged cross-sectional structural diagram of the light-emitting unit of the third primary color in the display panel shown in fig. 15, and comparing fig. 14 and fig. 16, the distance between the adjacent light adjusting layers 300 in the second quantum dot layer 222 is larger than the distance between the adjacent light adjusting layers 300 in the third quantum dot layer 232.

In the present embodiment, since red light is longer than green light in wavelength, it is necessary to set the interval between the adjacent light adjustment layers 300 in the first quantum dot layer 211 to be larger than the interval between the adjacent light adjustment layers 300 in the second quantum dot layer 222, as shown in fig. 11 and 14; similarly, as shown in fig. 14 and 16, since green light is longer than blue light, it is necessary to set the interval between the adjacent light adjustment layers 300 in the second quantum dot layer 222 to be larger than the interval between the adjacent light adjustment layers 300 in the third quantum dot layer 233. That is, in the present embodiment, for the first, second, and third quantum dot layers 211, 222, and 233 having the same thickness, the distance between the adjacent light adjustment layers 300 in the first quantum dot layer 211 is the largest, the number of layers is the smallest, the distance between the adjacent light adjustment layers 300 in the second quantum dot layer 222 is the next, the number of layers is the larger, and the distance between the adjacent light adjustment layers 300 in the third quantum dot layer 233 is the smallest, and the number of layers is the largest.

It should be noted that, in the present embodiment, the third light emitting element 231 is an ultraviolet LED, because, when the third light emitting element 231 is a blue LED, as shown in fig. 2, the blue light can be directly emitted after passing through the light scattering layer 232 without performing color conversion by using a quantum dot layer, and when the third light emitting element 231 is an ultraviolet LED, the third quantum dot layer 233 needs to be disposed to perform color conversion on the ultraviolet light and convert the ultraviolet light into blue light to be emitted.

On the basis of any of the above embodiments, optionally, in an embodiment of the present application, the total reflection region 320 is an Ag metal region, an Al metal region, a Ti metal region, or a Mo metal region.

Alternatively to any of the above embodiments, in an embodiment of the present application, the semi-reflective region 310 is a Mg/Ag alloy metal region or an Indium Tin Oxide (ITO) region.

In addition, referring to fig. 2 and fig. 15, the display panel provided in the embodiments of the present application further includes blocking walls 500 to block the light emitting units 200; an encapsulation layer 510 to seal each light emitting cell 200; a filter layer 520 for filtering out the light with the excessive color, for example, the filter layer 520 above the red light emitting unit 210 filters out the excessive blue light emitted by the light emitting device 211 and transmits the red light; a light-shielding layer 530 and a cover glass/film 540.

An embodiment of the present application further provides a display device 700, and as shown in fig. 17, the display device 700 includes the display panel 600 provided in any one of the embodiments. Since the specific structure of the display panel 600 has been described in detail in the foregoing embodiments, it is not described herein again. The display device 700 may be any electronic device with a display function, such as a touch display screen, a mobile phone, a tablet computer, a notebook computer, an electronic paper book, or a television.

In summary, the present application discloses a display panel and a display device, the display panel includes a first primary color light emitting unit located on a substrate, the first primary color light emitting unit includes a first light emitting element and a first quantum dot layer covering the first light emitting element, at least one light adjusting layer is disposed on a side of the first light emitting element away from the substrate in the first quantum dot layer, the light adjusting layer includes at least one semi-reflective region and at least one total reflective region, and a reflective barrier is disposed on a sidewall surface of the first primary color light emitting unit and a surface facing the substrate, so that light emitted from the first light emitting element is transmitted back and forth in the first quantum dot layer, an optical path of the light in the first quantum dot layer is increased, and thus an absorption rate of the first quantum dot layer to the light is increased, and further a light conversion efficiency of the first quantum dot layer is improved. And a semi-reflection area and a total reflection area in the adjacent light adjusting layers are further arranged to be overlapped in the direction vertical to the surface of the substrate to form a micro-cavity structure, so that the spectrum of emergent light is narrowed, and the color gamut of the display panel is improved.

All parts in the specification are described in a mode of combining parallel and progressive, each part is mainly described to be different from other parts, and the same and similar parts among all parts can be referred to each other.

In the above description of the disclosed embodiments, features described in various embodiments in this specification can be substituted for or combined with each other to enable those skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display panel, comprising:

a substrate;

at least one light ray adjusting layer is arranged in the first quantum dot layer, the light ray adjusting layer is positioned on one side, away from the substrate, of the first light-emitting element, and the light ray adjusting layer comprises at least one semi-reflecting region and at least one total-reflecting region;

the lateral wall surface of first primary color luminescence unit and orientation the surface of base plate all is provided with the reflection barricade, the reflection barricade is used for to directive reflection barricade's light reflects.

2. The display panel according to claim 1, wherein the at least one semi-reflective region comprises a plurality of semi-reflective regions, the at least one total-reflective region comprises a plurality of total-reflective regions, and the semi-reflective regions and the total-reflective regions are alternately arranged along a first direction parallel to the substrate surface.

3. The display panel according to claim 2, wherein the light adjusting layer comprises a plurality of rows of the semi-reflective regions and the total-reflective regions alternately arranged along the first direction, and the rows are sequentially arranged along a second direction, the second direction being parallel to the substrate surface and perpendicular to the first direction;

the semi-reflecting regions in two adjacent rows in the light adjusting layer are arranged in a staggered mode, and the total-reflecting regions in two adjacent rows are arranged in a staggered mode.

4. The display panel according to claim 3, wherein in the second direction, the center of the semi-reflective region in the ith row is aligned with the center of the total reflective region in the (i + 1) th row, the center of the total reflective region in the ith row is aligned with the center of the semi-reflective region in the (i + 1) th row, and i is an integer not less than 1.

5. The display panel according to claim 4, wherein in the ith row in the light adjustment layer, the width of the semi-reflective region in the second direction is equal to the width of the total reflective region in the second direction, and the length of the semi-reflective region between adjacent total reflective regions in the first direction is greater than, equal to, or less than the length of the total reflective region in the first direction.

6. The display panel according to claim 2, wherein the plurality of semi-reflective regions comprises a plurality of first semi-reflective regions and a plurality of second semi-reflective regions, the light adjusting layer comprises a plurality of rows of the first semi-reflective regions and the total reflective regions alternately arranged along the first direction, and two adjacent rows are separated by one of the second semi-reflective regions;

the first half reflection areas in two adjacent lines in the light ray adjusting layer correspond to one another, and the total reflection areas in two adjacent lines correspond to one another.

7. The display panel according to claim 2, wherein the plurality of total reflection regions include a plurality of first total reflection regions and a plurality of second total reflection regions, the light adjusting layer includes a plurality of rows of the semi-reflection regions and the first total reflection regions alternately arranged along the first direction, and two adjacent rows are separated by one of the second total reflection regions;

the semi-reflecting regions in two adjacent rows in the light ray adjusting layer correspond to one another, and the first total-reflecting regions in two adjacent rows correspond to one another.

8. The display panel according to any one of claims 1 to 7, wherein at least one of the light ray adjusting layers in the first quantum dot layer comprises at least two light ray adjusting layers arranged in sequence in a direction away from the substrate;

the orthographic projection of a semi-reflection area in the j-th layer of light adjusting layer on the surface of the substrate is at least partially overlapped with the orthographic projection of a total reflection area in the j + 1-th layer of light adjusting layer on the surface of the substrate, the orthographic projection of the total reflection area in the j-th layer of light adjusting layer on the surface of the substrate is at least partially overlapped with the orthographic projection of the semi-reflection area in the j + 1-th layer of light adjusting layer on the surface of the substrate, and j is an integer not less than 1.

9. The display panel according to claim 8, wherein an orthographic projection of the semi-reflective region in the j-th layer light regulating layer on the substrate surface coincides with an orthographic projection of the total reflective region in the j + 1-th layer light regulating layer on the substrate surface, and an orthographic projection of the total reflective region in the j-th layer light regulating layer on the substrate surface coincides with an orthographic projection of the semi-reflective region in the j + 1-th layer light regulating layer on the substrate surface.

10. The display panel according to claim 9, wherein in the j-th light adjusting layer, the area of each semi-reflective region is equal to the area of each full-emissive region.

11. The display panel according to claim 8, wherein in the m-th light ray adjustment layer, the total area of each semi-reflective region is larger than the total area of each total reflective region, and m is an odd number not smaller than 1;

in the nth light ray adjusting layer, the total area of each semi-reflecting region is smaller than or equal to that of each total reflecting region, and n is an even number not smaller than 1.

12. The display panel according to claim 8, wherein the arrangement of the semi-reflective regions and the total emission regions in the j-th light adjusting layer is the same as that of the semi-reflective regions and the total emission regions in the j + 2-th light adjusting layer.

13. The display panel according to claim 1, wherein the light emitting unit further comprises a second primary color light emitting unit including a second light emitting element and a second quantum dot layer covering the second light emitting element, the second quantum dot layer being configured to convert light emitted from the second light emitting element into visible light of a second primary color;

at least one layer of light ray adjusting layer is arranged on one side, away from the substrate, of the second light emitting element in the second quantum dot layer;

the side wall surface of the second primary color light-emitting unit and the surface facing the substrate are both provided with the reflecting retaining wall;

the first primary color is red light, the second primary color is green light, and the space between the adjacent light adjusting layers in the first quantum dot layer is larger than the space between the adjacent light adjusting layers in the second quantum dot layer.

14. The display panel according to claim 13, wherein the light-emitting unit further comprises a third primary color light-emitting unit comprising a third light-emitting element and a third quantum dot layer covering the third light-emitting element, the third quantum dot layer being configured to convert light emitted from the third light-emitting element into visible light of a third primary color;

at least one layer of light ray adjusting layer is arranged on one side, away from the substrate, of the third light emitting element in the third quantum dot layer;

the side wall surface of the third primary color light-emitting unit and the surface facing the substrate are provided with the reflection retaining walls;

the third primary color visible light is blue light, and the distance between the adjacent light adjusting layers in the second quantum dot layer is larger than the distance between the adjacent light adjusting layers in the third quantum dot layer.

15. The display panel according to claim 1, wherein the total reflection region is an Ag metal region, an Al metal region, a Ti metal region, or a Mo metal region.

16. The display panel of claim 1, wherein the semi-reflective region is a Mg/Ag alloy metal region or an Indium Tin Oxide (ITO) region.

17. A display device characterized by comprising the display panel according to any one of claims 1 to 16.