Display panel and display device

Abstract

The present application provides a display panel and a display device, relating to the technical field of displays, and is used to improve the light-emitting efficiency of the display panel. The display panel includes a blue OLED device layer, an auxiliary light-emitting layer, and a quantum dot layer that are sequentially stacked; the quantum dot layer includes a red quantum dot unit, a green quantum dot unit, and a blue light-transmitting region, the auxiliary light-emitting layer includes a light-transmitting layer located between the blue OLED device layer and the quantum dot layer, and a light reflection structure disposed in the light-transmitting layer, the light reflection structure is configured to reflect part of the blue light emitted by the blue OLED device layer to the quantum dot layer, and reflect part of the light emitted from the quantum dot layer back to the quantum dot layer. The display panel provided by the present application is applied to a display device.

Description

Technical Field

[0001] This application relates to the field of display technologies, and in particular, to a display panel and a display device. Background Art

[0002] As a current-driven light-emitting device, an Organic Light Emitting Diode (OLED for short) has been increasingly applied to high-performance display fields such as display panels due to its self-luminescence, fast response, wide viewing angle, and the ability to be fabricated on flexible substrates. However, the light-emitting efficiency of existing display panels is relatively low. Summary of the Invention

[0003] In view of the above problems, embodiments of this application provide a display panel and a display device for improving the light-emitting efficiency of the display panel.

[0004] To achieve the above object, embodiments of this application provide the following technical solutions:

[0005] A first aspect of embodiments of this application provides a display panel, which includes: a blue OLED device layer, an auxiliary light extraction layer, and a quantum dot layer that are sequentially stacked; the quantum dot layer includes a red quantum dot unit, a green quantum dot unit, and a blue light-transmitting region, the auxiliary light extraction layer includes a light-transmitting layer located between the blue OLED device layer and the quantum dot layer, and a light reflection structure disposed in the light-transmitting layer, and the light reflection structure is configured to reflect part of the blue light emitted by the blue OLED device layer to the quantum dot layer, and reflect part of the light emitted from the quantum dot layer to the blue OLED device layer back to the quantum dot layer.

[0006] In the above display panel, by providing an auxiliary light extraction layer between the blue OLED device layer and the quantum dot layer, and a light reflection structure is provided in the auxiliary light extraction layer, the light reflection structure can reflect part of the light emitted from the quantum dot layer to the blue OLED device layer back to the quantum dot layer and emit it from the front of the display panel, so that part of the light emitted from the quantum dot layer to the blue OLED device layer can also be utilized, thereby reducing the loss of the light emitted from the quantum dot layer, improving the light utilization rate of the quantum dot layer, and further improving the light-emitting efficiency of the display panel.

[0007] In a possible implementation manner, the light reflection structure is an inverted conical structure, the tip of the inverted conical structure faces the blue OLED device layer, the bottom surface of the inverted conical structure faces the quantum dot layer, and the bottom surface of the inverted conical structure is parallel to the quantum dot layer.

[0008] In a possible implementation, the light reflection structure is a conical structure or a triangular pyramid structure, the blue light OLED device layer includes a plurality of blue light pixels, and the shape of the blue light pixels is rectangular;

[0009] Preferably, when the light reflection structure is a conical structure, the apex angle of the conical structure is 5°-45°, and the diameter of the bottom surface of the conical structure is 1%-10% of the length of the blue light pixel, or the diameter of the bottom surface of the conical structure is 1%-10% of the width of the blue light pixel.

[0010] In a possible implementation, the blue light OLED device layer includes an array substrate, an anode layer, a blue light emitting layer, a cathode layer, and a packaging layer stacked in sequence, and the blue light emitting layer includes a plurality of the blue light pixels.

[0011] In a possible implementation, the light reflection structure includes a conical main body, and both the conical surface and the bottom surface of the conical main body are reflective surfaces;

[0012] Preferably, the conical main body includes a frame layer and an outer layer covering the frame layer, and the outer surface of the outer layer forms the reflective surface.

[0013] In a possible implementation, a plurality of the light reflection structures are arranged at intervals in the auxiliary light emitting layer, and the gap between any two adjacent light reflection structures is configured such that the blue light reflected by the conical surfaces of the two light reflection structures can pass through the gap and irradiate the quantum dot layer.

[0014] In a possible implementation, the light transmissive layer is an organic glue layer connected to the blue light OLED device layer and the quantum dot layer on both sides respectively, and the thickness of the organic glue layer in the direction perpendicular to the blue light OLED device layer is 5-10 μm.

[0015] In a possible implementation, the quantum dot layer further includes a black matrix, the black matrix includes a plurality of openings, and each opening is provided with a red light quantum dot unit, a green light quantum dot unit, or a blue light transmissive region;

[0016] Preferably, the blue light transmissive region is a blank region formed in the opening of the black matrix.

[0017] In a possible implementation, the display panel further includes a color filter layer disposed on the quantum dot layer, the color filter layer includes a red light filter region, a green light filter region, and a blue light filter region, the red light filter region corresponds to the red light quantum dot unit, the green light filter region corresponds to the green light quantum dot unit, and the blue light filter region corresponds to the blue light transmissive region.

[0018] A second aspect of the embodiments of the present application provides a display device, including the display panel of any one of the embodiments in the first aspect above. Since this display device includes the display panel described in the first aspect above, therefore, this display device also has the advantages of the display panel described in the first aspect above, which will not be elaborated here. For specific details, please refer to the relevant descriptions above.

[0019] In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the beneficial effects brought by these technical features of the technical solutions described above, the other technical problems that can be solved by the display panel and the display device provided by the embodiments of the present invention, the other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manners. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of the display panel provided by the embodiments of the present invention;

[0022] Figure 2 It is a cross-sectional view of the display panel provided by the embodiments of the present invention;

[0023] Figure 3 For Figure 2 It is an optical path diagram between the blue OLED device layer and the auxiliary light extraction layer in

[0024] Figure 4 It is a top view of the auxiliary light extraction layer in the embodiments of the present invention;

[0025] Figure 5 For Figure 2 It is a schematic structural diagram of the light reflection structure in

[0026] Description of the reference numerals:

[0027] 100 - Blue OLED device layer;

[0028] 101 - Blue pixel;

[0029] 200 - Auxiliary light extraction layer;

[0030] 201 - Translucent layer;

[0031] 202 - Light reflection structure;

[0032] 203 - Conical surface;

[0033] 204 - Bottom surface;

[0034] 300 - Quantum dot layer;

[0035] 301 - Red light quantum dot unit;

[0036] 302 - Green light quantum dot unit;

[0037] 303 - Blue light transmissive region;

[0038] 304 - Black matrix;

[0039] 400 - Color filter layer;

[0040] 401 - Red light filter region;

[0041] 402 - Green light filter region;

[0042] 403 - Blue light filter region. Detailed implementation mode

[0043] In the related art, a display panel generally includes an array substrate, an anode layer, a light-emitting layer, a cathode layer, and a packaging layer which are sequentially stacked. Among them, the light-emitting layer is usually formed on the anode layer by means of vacuum evaporation. Exemplarily, in a vacuum chamber, the anode layer is masked by a Fine Metal Mask (abbreviated as FMM). After the organic light-emitting material is heated, it evaporates through the openings of the FMM and is deposited on the anode layer to form red (R) pixels, green (G) pixels, and blue (B) pixels. However, as the size of the display panel increases and the resolution improves, the size of the FMM increases and the number of openings increases, resulting in easy deformation of the FMM, causing misalignment between the openings of the FMM and the anode blocks of the anode layer, and further making it difficult to accurately deposit and form R pixels, G pixels, and B pixels in a predetermined area, resulting in color mixing during the evaporation process of the display panel.

[0044] To solve the problem of color mixing generated during the evaporation process of a display panel, one improvement method is to use an evaporated blue OLED in combination with a quantum dot (Quantum Dots, abbreviated as QD) color film technology, that is, to adopt the QD-OLED technology. Exemplarily, first, a blue OLED device layer is formed on an array substrate, and then a quantum dot layer including a red (R) quantum dot unit, a green (G) quantum dot unit, and a light-transmitting region for blue light to pass through is formed above the blue OLED device layer. After that, a color filter (abbreviated as CF) is formed on the quantum dot layer. The blue light emitted by the blue OLED device excites the red quantum dot unit in the quantum dot layer to emit red light and excites the green quantum dot unit in the quantum dot layer to emit green light. The red light and green light emitted by the quantum dot layer and the blue light passing through the light-transmitting region in the quantum dot layer achieve color display of the display panel.

[0045] However, the inventors of the present application found during the research process that for a display panel made using the QD-OLED technology, after the blue OLED device excites the red quantum dot unit and the green quantum dot unit, the red quantum dot unit and the green quantum dot unit can emit light circumferentially, but only the light facing the outside of the display panel can be observed by the viewer, and the rest of the light will be lost. For example, the light between 0-180 degrees on the outside of the display panel can be observed, while the light on the inside of the display panel is absorbed by the light-absorbing structure (such as a black matrix) or light-absorbing material (such as the black material forming the black matrix) inside the display panel, resulting in low utilization rate of the light emitted by the excited red quantum dot unit and green quantum dot unit, and thus low luminous efficiency of the display panel.

[0046] To address the problem of low luminous efficiency of the above display panel, an embodiment of the present application provides a display panel, in which an auxiliary light-emitting layer is formed above the blue OLED device layer, and a plurality of light reflection structures are arranged at intervals in the auxiliary light-emitting layer. The blue light emitted by the blue OLED device layer is reflected by the gaps between adjacent light reflection structures and the light reflection structures and then irradiates the quantum dot layer to activate the red quantum dot unit and the green quantum dot unit to emit light of corresponding colors, and the light reflection structures are used to reflect the light emitted by the red quantum dot unit and the green quantum dot unit so that the light irradiates the outside of the display panel, thereby reducing the loss of the light emitted by the red quantum dot unit and the green quantum dot unit, improving the light utilization rate of the red quantum dot unit and the green quantum dot unit, and further improving the luminous efficiency of the display panel.

[0047] In order to make the above-mentioned objects, features, and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0048] Referring to Figures 1 to 5 , the display panel provided by the embodiment of the present application includes a blue light OLED device layer 100, a light extraction assisting layer 200, and a quantum dot layer 300 that are sequentially stacked. Among them, the blue light OLED device layer 100 is located at the lower part of the display panel, and is used to carry the light extraction assisting layer 200 and the quantum dot layer 300, and to emit blue light.

[0049] The quantum dot layer 300 is located above the blue light OLED device layer 100. The quantum dot layer 300 includes a red light quantum dot unit 301, a green light quantum dot unit 302, and a blue light transmissive region 303. Among them, there are usually multiple red light quantum dot units, green light quantum dot units, and blue light transmissive regions respectively. These red light quantum dot units 301, green light quantum dot units 302, and blue light transmissive regions 303 are generally arranged in a multi-row and multi-column manner. The red light quantum dot unit 301 can be excited by the blue light emitted by the blue light OLED device layer 100 to emit red light, the green light quantum dot unit 302 can be excited by the blue light emitted by the blue light OLED device layer 100 to emit green light, and the blue light transmissive region 303 can allow the blue light emitted by the blue light OLED device layer 100 in the region opposite to the blue light transmissive region 303 to pass through, so that the quantum dot layer 300 can emit a composite light including red light, green light, and blue light, thereby enabling the display panel to achieve a display function.

[0050] The light extraction assisting layer 200 is located between the blue light OLED device layer 100 and the quantum dot layer 300. The surface of the light extraction assisting layer 200 facing the blue light OLED device layer 100 can be in direct contact with the blue light OLED device layer 100. Taking the orientation shown in the display panel as an example, the lower surface of the light extraction assisting layer 200 is attached to the light emitting surface of the blue light OLED device layer 100. Of course, the light extraction assisting layer 200 may not be in direct contact with the blue light OLED device layer 100. For example, the lower surface of the light extraction assisting layer 200 is bonded to the light emitting surface of the blue light OLED device layer 100 through an optical adhesive (OCA). Similarly, the surface of the light extraction assisting layer 200 facing the quantum dot layer 300 can be in contact with the quantum dot layer 300. Taking Figure 2 the orientation shown in the display panel as an example, the lower surface of the light extraction assisting layer 200 is attached to the light emitting surface of the blue light OLED device layer 100. Of course, the light extraction assisting layer 200 may not be in direct contact with the blue light OLED device layer 100. For example, the lower surface of the light extraction assisting layer 200 is bonded to the light emitting surface of the blue light OLED device layer 100 through an optical adhesive (OCA). Similarly, the surface of the light extraction assisting layer 200 facing the quantum dot layer 300 can be in contact with the quantum dot layer 300. Taking Figure 2Taking the orientation shown in the display panel as an example, the upper surface of the auxiliary light-emitting layer 200 is attached to the lower surface of the quantum dot layer 300. Of course, the upper surface of the auxiliary light-emitting layer 200 may not be in direct contact with the lower surface of the quantum dot layer 300. For example, an optical adhesive is provided between the upper surface of the auxiliary light-emitting layer 200 and the lower surface of the quantum dot layer 300, and the upper surface of the auxiliary light-emitting layer 200 is bonded to the lower surface of the quantum dot layer 300 through the optical adhesive.

[0051] In this embodiment, the auxiliary light-emitting layer 200 includes a light-transmitting layer 201 located between the blue light OLED device layer 100 and the quantum dot layer 300, and a light reflection structure 202 disposed in the light-transmitting layer 201. Among them, the light-transmitting layer 201 can allow the blue light emitted by the blue light OLED device layer 100 to pass through. The light reflection structure 202 is disposed in the light-transmitting layer 201 and is used for reflecting a part of the blue light emitted by the blue light OLED device layer 100 to the quantum dot layer 300, and reflecting a part of the light emitted from the quantum dot layer 300 to the blue light OLED device layer 100 back to the quantum dot layer 300.

[0052] When the display panel with the above structure is working, the blue light OLED device layer 100 emits blue light. A part of this blue light directly passes through the light-transmitting layer 201 and shoots towards the quantum dot layer 300, and another part is reflected by the light reflection structure 202 and then shoots towards the quantum dot layer 300. After the quantum dot layer 300 receives the above blue light, the red light quantum dot unit 301 is excited by the blue light and emits red light, the green light quantum dot unit 302 is excited by the blue light and emits green light, and the blue light transmissive region 303 can allow the blue light emitted by the blue light OLED device layer 100 in the region opposite to the blue light transmissive region 303 to pass through, so that the quantum dot layer 300 can emit a composite light including red light, green light and blue light, thereby enabling the display panel to achieve the display function.

[0053] During the working process of the above display panel, not all the light emitted by the quantum dot layer 300 will shoot towards the outside of the display panel. A part of the light will shoot towards the inside of the display panel, that is, a part of the light emitted by the quantum dot layer 300 will pass through the light-transmitting layer 201 and shoot towards the blue light OLED device layer 100. Since the light reflection structure 202 is provided in the light-transmitting layer 201, the light shooting from the quantum dot layer 300 to the light reflection structure 202 is reflected back to the quantum dot layer 300 and shoots towards the outside of the display panel from the quantum dot layer 300. Therefore, compared with the light shooting from the quantum dot layer 300 to the blue light OLED device layer 100 being absorbed in the related art, the loss of the light emitted by the red light quantum dot unit 301 and the green light quantum dot unit 302 is reduced, the light utilization rate of the red light quantum dot unit 301 and the green light quantum dot unit 302 is improved, and thus the light-emitting efficiency of the display panel is improved.

[0054] In the above embodiments, the light reflection structure 202 reflects the light emitted by the red quantum dot unit 301 and the green quantum dot unit 302 towards the inner side of the display panel back to the quantum dot layer 300. In some embodiments, the light reflection structure 202 is an inverted conical structure, and the tip of the inverted conical structure faces the blue light OLED device layer 100, so that some of the blue light emitted by the blue light OLED device layer 100 can easily pass by the light reflection structure and reach the quantum dot layer 300; at the same time, the blue light incident on the light reflection structure 202 from the blue light OLED device layer 100 can also be easily reflected to the quantum dot layer 300. The bottom surface 204 of the inverted conical structure faces the quantum dot layer 300, and the bottom surface 204 of the inverted conical structure is parallel to the quantum dot layer 300, so that the light incident on the light reflection structure 202 from the quantum dot layer 300 can be easily reflected back to the quantum dot layer 300. At the same time, it can also increase the area of the light reflecting surface of the light reflection mechanism, so as to reflect more light back to the quantum dot layer 300, further reducing the loss of the light emitted by the red quantum dot unit 301 and the green quantum dot unit 302, improving the light utilization rate of the red quantum dot unit 301 and the green quantum dot unit 302, and thus improving the light emitting efficiency of the display panel.

[0055] In some embodiments, the light reflection structure 202 includes a conical main body, and both the conical surface 203 and the bottom surface 204 of the conical main body are light reflecting surfaces. Further, the conical main body includes a frame layer and an outer layer covering the frame layer, and the outer surface of the outer layer forms a light reflecting surface.

[0056] Exemplarily, the light reflection structure 202 can be a conical structure or a triangular pyramid structure, that is, the inverted conical structure can be an inverted conical structure or an inverted triangular pyramid structure, and its tip points to the blue light OLED device layer 100. Among them, both the conical surface 203 and the bottom surface 204 of the conical structure are light reflecting surfaces, and a pure metal material can be used, because the pure metal has a higher reflectivity, and the reflectivity is usually greater than 80%. Exemplarily, metal silver or aluminum can be selected.

[0057] The conical main body includes a frame layer and an outer layer covering the frame layer. Among them, the material of the frame layer can be an oxide ceramic, exemplarily, it can be alumina ceramic, beryllium oxide ceramic, silicon dioxide ceramic or titanium dioxide ceramic; the material of the outer layer can be a pure metal material, exemplarily, metal silver or aluminum can be selected. Such a design can not only control the reflectivity of the conical structure by controlling the thickness of the light reflecting layer according to the actual application requirements, but also optimize the material of the frame layer of the conical structure to reduce costs.

[0058] As an achievable implementation, the blue OLED device layer 100 includes a plurality of blue pixels 101, and the plurality of blue pixels 101 are arranged in a multi-row and multi-column manner. Taking the plane parallel to the quantum dot layer 300 as the cross-section, the cross-sectional shape of the blue pixel 101 is rectangular. In this embodiment, the light reflection structure 202 can be a conical structure. Taking the plane perpendicular to the quantum dot layer 300 and passing through the center line of the conical structure as the cross-section, the cross-sectional shape of the conical structure is an isosceles triangle, and the apex angle of the isosceles triangle is 5°-45°, that is, the apex angle of the conical structure is 5°-45°; the bottom surface 204 of the conical structure is circular in shape, and the diameter of the bottom surface 204 of the conical structure is 1%-10% of the length of the blue pixel, or the diameter of the bottom surface 204 of the conical structure is 1%-10% of the width of the blue pixel. In this way, not only can the problem of mutual reflection loss of blue light caused by the reflection of blue light from the light reflection structure towards the blue OLED device layer when the apex angle is too large be reduced, but also the light reflection efficiency of the cone bottom will not be low due to the too small area of the bottom surface 204 of the conical structure when the apex angle is too small. In addition, the above conical structure is simple to prepare and has low cost.

[0059] The blue OLED device layer 100 includes an array substrate, an anode layer, a blue light emitting layer, a cathode layer, and a packaging layer stacked in sequence. The blue light emitting layer includes a plurality of blue pixels. During operation, under the control of the array substrate, holes in the anode layer and electrons in the cathode layer can recombine in the blue light emitting layer to form excitons, so that each blue pixel emits blue light.

[0060] In the above embodiment, one light reflection structure 202 or multiple light reflection structures 202 can be provided in the light transmissive layer 201 of the auxiliary light emitting layer 200. Preferably, multiple light reflection structures 202 are provided in the light transmissive layer 201, and these light reflection structures 202 are arranged at intervals in the light transmissive layer 201. The gap between any two adjacent light reflection structures is configured such that the blue light reflected by the conical surfaces 203 of the two light reflection structures 202 can pass through the gap and reach the quantum dot layer 300. That is, the gap between two adjacent light reflection structures needs to be satisfied so that the blue light emitted by the blue OLED device layer 100 can pass through the gap into the quantum dot layer 300 to the greatest extent, thereby ensuring that the blue light incident from the apex or conical surface 203 of any light reflection structure 202 can be reflected and then emitted from the adjacent cone bottom edge or the gap between adjacent light reflection structures to the quantum dot layer 300, and thus maximizing the light extraction efficiency of the blue light emitted by the blue OLED device layer 100. It should be noted that compared with the related art, the light extraction efficiency of the blue light emitted by the blue OLED device layer 100 can be increased by 30%-50%.

[0061] It should be noted that the blue light passing through the gap between two adjacent light reflection structures includes: the blue light directly reaching the quantum dot layer 300 through the gap, and the blue light reflected by the light reflection structure and then passing through the gap. The above auxiliary light-emitting layer 200 can be prepared in the following manner: The light reflection structure 202 can be used as an additive and mixed with a solvent or a dispersant to form a stable dispersion system, and then solidified to form the auxiliary light-emitting layer 200.

[0062] As an implementable embodiment, the light-transmitting layer 201 is an organic glue layer respectively connected to the blue light OLED device layer 100 and the quantum dot layer 300 on both sides. The thickness of the organic glue layer in the direction perpendicular to the blue light OLED device layer is 5 - 10 μm. For example, the thickness of the organic glue layer is 10 μm, 7.5 μm or 5 μm. Designed in this way, the light-transmitting layer 201 can not only play a cementing role, but also be used as a dispersant to mix with the light reflection structure 202 to ensure the light output effect of the light-transmitting layer 201. If the organic glue layer is too thin, for example, when the thickness of the organic glue layer is less than 5 μm, the amount of glue in the organic glue layer is small at this time, which cannot meet the requirements of the cementing function and affects the reliability of the display panel; if the organic glue layer is too thick. For example, when the thickness of the organic glue layer is greater than 10 μm, it will affect the transmittance of the light-transmitting layer.

[0063] The organic glue layer has a refraction effect on the incident light, and the refractive index varies due to different materials. The refractive index of the organic glue layer can be selected between 1.5 and 1.8, so that the light-transmitting layer 201 has a better light transmittance.

[0064] In some embodiments, referring to Figure 2 , the quantum dot layer 300 further includes a black matrix 304. The black matrix 304 includes a plurality of openings, and each opening is provided with a red light quantum dot unit 301, a green light quantum dot unit 302 or a blue light transmission area 303. Among them, the blue light transmission area 303 can be a blank area formed in the opening of the black matrix, so as to improve the transmittance of the blue light emitted by the blue light OLED device layer 100 passing through the blue light transmission area 303.

[0065] In other embodiments, referring to Figure 1 and Figure 2 , the display panel further includes a color filter layer 400 formed on the quantum dot layer 300. The color filter layer 400 includes a red light filter area 401, a green light filter area 402 and a blue light filter area 403. Among them, the red light filter area 401 is arranged in one-to-one correspondence with the red light quantum dot unit 301, the green light filter area 402 is arranged in one-to-one correspondence with the green light quantum dot unit 302, and the blue light filter area 403 is arranged in one-to-one correspondence with the blue light transmission area 303. Designed in this way, it can ensure accurate filtering of the light emitted by the quantum dot layer 300 to realize the color picture display of the display panel.

[0066] The embodiment of the present application further provides a display device, including the display panel described in the above embodiment. Since this display device includes the display panel described in each of the above embodiments, therefore, this display device also has the advantages of the above display panel, which will not be repeated here. For details, please refer to the relevant description above. The display device provided in this embodiment can be any product or component with a display function, such as a television, a digital camera, a mobile phone, a tablet computer, a laptop computer, a smart watch, an e-book, a navigator, an in-vehicle computer, etc.

[0067] The embodiments or implementation manners in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0068] It should be noted that the phrases such as "an embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include specific features, structures or characteristics, but not every embodiment necessarily includes such specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when combining an embodiment to describe a specific feature, structure or characteristic, it is within the knowledge scope of those skilled in the art to implement such a feature, structure or characteristic in combination with other embodiments, whether explicitly or implicitly described.

[0069] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display panel, characterized in that, It includes a blue light OLED device layer, an auxiliary light extraction layer, and a quantum dot layer that are stacked in sequence; the quantum dot layer includes a red light quantum dot unit, a green light quantum dot unit, and a blue light transmissive region, the auxiliary light extraction layer includes a light transmissive layer located between the blue light OLED device layer and the quantum dot layer, and a light reflection structure disposed in the light transmissive layer, and the light reflection structure is configured to reflect a part of the blue light emitted by the blue light OLED device layer to the quantum dot layer, and reflect a part of the light emitted from the quantum dot layer to the blue light OLED device layer back to the quantum dot layer.

2. The display panel according to claim 1, characterized in that, The light reflection structure is an inverted conical structure, the tip of the inverted conical structure faces the blue light OLED device layer, the bottom surface of the inverted conical structure faces the quantum dot layer, and the bottom surface of the inverted conical structure is parallel to the quantum dot layer.

3. The display panel according to claim 2, characterized in that, The light reflection structure is a conical structure or a triangular pyramid structure, and the blue light OLED device layer includes a plurality of blue light pixels, and the shape of the blue light pixels is rectangular; When the light reflection structure is a conical structure, the apex angle of the conical structure is 5°-45°, the diameter of the bottom surface of the conical structure is 1%-10% of the length of the blue light pixel, or the diameter of the bottom surface of the conical structure is 1%-10% of the width of the blue light pixel.

4. The display panel according to claim 3, characterized in that, The blue light OLED device layer includes an array substrate, an anode layer, a blue light emitting layer, a cathode layer, and a packaging layer that are stacked in sequence, and the blue light emitting layer includes a plurality of the blue light pixels.

5. The display panel according to claim 1, characterized in that, The light reflection structure includes a conical main body, and both the conical surface and the bottom surface of the conical main body are light reflecting surfaces; The conical main body includes a frame layer and an outer layer covering the frame layer, and the outer surface of the outer layer forms the light reflecting surface.

6. The display panel according to any one of claims 1-5, characterized in that, A plurality of the light reflection structures are arranged at intervals in the auxiliary light extraction layer, and the gap between any two adjacent light reflection structures is configured such that the blue light reflected by the conical surfaces of the two light reflection structures can pass through the gap and reach the quantum dot layer.

7. The display panel according to claim 1, characterized in that, The light transmissive layer is an organic glue layer connected to the blue light OLED device layer and the quantum dot layer on both sides respectively, and the thickness of the organic glue layer in the direction perpendicular to the blue light OLED device layer is 5-10 μm.

8. The display panel according to claim 1, characterized in that, The quantum dot layer further includes a black matrix, the black matrix includes a plurality of openings, and each opening is provided with one of the red light quantum dot unit, the green light quantum dot unit, or the blue light transmissive region; The blue light transmissive region is a blank region formed in the opening of the black matrix.

9. The display panel according to claim 1, characterized in that, The display panel further includes a color filter layer disposed on the quantum dot layer, the color filter layer includes a red light filter region, a green light filter region, and a blue light filter region, the red light filter region corresponds to the red light quantum dot unit, the green light filter region corresponds to the green light quantum dot unit, and the blue light filter region corresponds to the blue light transmissive region.

10. A display device, characterized in that, It includes the display panel according to any one of claims 1-9.

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