Display panel

Abstract

This application provides a display panel. The display panel includes multiple pixel units, each pixel unit including a red area, a green area, and a blue area. The display panel includes a substrate, a blue light-emitting device, an encapsulation layer, and a quantum dot film. The quantum dot film includes red and green quantum dot color areas and a light-transmitting area. The red quantum dot color area is located in the red area and emits red light when excited by blue light emitted by the blue light-emitting device. The green quantum dot color area is located in the green area and emits green light when excited by blue light emitted by the blue light-emitting device. The light-transmitting area is located in the blue area and is configured to transmit blue light emitted by the blue light-emitting device. The display panel also includes a light conversion layer disposed between the encapsulation layer and the quantum dot film. The light conversion layer converts the downward-emitted red and green light into blue light, thereby reducing the superposition and interference between different colors of light emitted by the quantum dot film and improving the color purity of the display panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel. BACKGROUND

[0002] This part provides only background information related to the present disclosure, which does not necessarily have to be prior art.

[0003] Organic light emitting diode (OLED) has the advantages of self-illumination, high brightness, high contrast, fast response speed, wide viewing angle, simple structure, flexibility and other advantages. Due to its excellent performance, it has attracted the attention of colleges and enterprises, and has developed rapidly and been widely used in display products.

[0004] In the related art, in order to increase the display color gamut of the OLED display panel, the OLED display panel uses quantum dots to make a color film (CF) layer, that is, a quantum dot film is formed, so that the light emitting layer capable of emitting blue light excites the quantum dots in the color film layer to emit RGB monochromatic light. However, although this method can improve the display color gamut of the OLED display panel, since the quantum dot film is a nano-particle light-emitting layer, the light-emitting angle is relatively dispersed, and the different colors of light emitted will interfere with each other, reducing the color purity of the OLED display panel. SUMMARY

[0005] The embodiments of the present application provide a display panel, which can reduce the interference between different colors of light emitted by the quantum dot film and improve the color purity of the display panel. The specific technical content is as follows:

[0006] The embodiments of the present application provide a display panel, which can reduce the interference between different colors of light emitted by the quantum dot film and improve the color purity of the display panel. The specific technical content is as follows:

[0007] The display panel comprises a substrate;

[0008] A blue light emitting device is arranged on the substrate;

[0009] An encapsulation layer is arranged on the side of the blue light emitting device away from the substrate;

[0010] A quantum dot film is disposed on the side of the encapsulation layer away from the substrate. The quantum dot film includes a red quantum dot color region, a green quantum dot color region, and a light-transmitting region. The red quantum dot color region is located in the red region and emits red light when excited by blue light emitted by the blue light-emitting device. The green quantum dot color region is located in the green region and emits green light when excited by blue light emitted by the blue light-emitting device. The light-transmitting region is located in the blue region and is configured to transmit blue light emitted by the blue light-emitting device.

[0011] A light conversion layer is disposed between the encapsulation layer and the quantum dot film. The light conversion layer is configured to emit blue light after being excited by either red or green light. The light conversion layer includes an upconversion luminescent material.

[0012] In some embodiments of this application, the orthogonal projection of the light conversion layer onto the substrate at least covers the red and green areas.

[0013] In some embodiments of this application, the orthographic projection of the light conversion layer onto the substrate covers the red and green areas.

[0014] The display panel further includes a light-transmitting layer, which is disposed on the same layer as the light conversion layer. The orthogonal projection of the light-transmitting layer on the substrate covers the blue area, and the light-transmitting layer is configured to transmit blue light emitted by the blue light-emitting device.

[0015] In some embodiments of this application, the light conversion layer includes a first sub-conversion layer and a second sub-conversion layer. The orthographic projection of the first sub-conversion layer on the substrate covers the red region. The first sub-conversion layer is configured to emit blue light after being excited by red light. The first sub-conversion layer includes a first upconversion luminescent material. The orthographic projection of the second sub-conversion layer on the substrate covers the green region. The second sub-conversion layer is configured to emit blue light after being excited by green light. The second sub-conversion layer includes a second upconversion luminescent material.

[0016] The display panel further includes a light-transmitting layer, which is disposed on the same layer as the first and second sub-conversion layers. The orthogonal projection of the light-transmitting layer on the substrate covers the blue area, and the light-transmitting layer is configured to transmit blue light emitted by the blue light-emitting device.

[0017] In some embodiments of this application, a groove is formed on the surface of the encapsulation layer near the quantum dot film, and the light conversion layer is disposed in the groove.

[0018] In some embodiments of this application, the encapsulation layer includes a first inorganic layer, an organic layer, and a second inorganic layer sequentially stacked along a direction close to the quantum dot film. The groove is formed on the surface of the second inorganic layer close to the quantum dot film, and the depth of the groove is less than the thickness of the second inorganic layer.

[0019] In some embodiments of this application, the upconversion luminescent material is a solid compound doped with rare earth elements.

[0020] In some embodiments of this application, the solid compound is any one or a mixture of sulfides, fluorides, tellurates, bismuthates and phosphates, and the rare earth element is any one or a mixture of two of Tm and Yb.

[0021] In some embodiments of this application, the solid compound is a pentaphosphate and the rare earth element is Tm.

[0022] In some embodiments of this application, the solid compound is a fluoride, and the rare earth elements are Yb and Tm.

[0023] In some embodiments of this application, the first upconversion luminescent material is: a solid compound doped with rare earth elements, wherein the solid compound is one or a mixture of two of fluorides and sulfides, and the rare earth elements are any one or a mixture of two of Tm and Yb.

[0024] The second upconversion luminescent material is a solid compound doped with rare earth elements, wherein the solid compound is a bismuthate and the rare earth element is Ho.

[0025] Beneficial effects of the embodiments in this application:

[0026] According to the display panel provided in this application embodiment, a light conversion layer is disposed between the encapsulation layer and the quantum dot film. The light conversion layer is configured to emit blue light after being excited by either red or green light. By converting the red and green light emitted downwards from the quantum dot film into blue light through the light conversion layer, the optical path of the light emitted downwards from the red and green quantum dot color regions of the quantum dot film is shortened, thereby reducing the superposition and interference between different colors of light emitted by the quantum dot film and improving the color purity of the display panel. Furthermore, the converted blue light can re-excite the quantum dot film to emit red and green light, thereby improving the light extraction efficiency of the display panel.

[0027] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments of this application or related technologies are briefly introduced below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of this application;

[0030] Figure 2 This is another structural schematic diagram of a display panel provided in an embodiment of this application;

[0031] Figure 3 A flowchart illustrating a method for manufacturing a display panel according to an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of another display panel structure provided in an embodiment of this application;

[0033] Figure 5 This is another schematic diagram of the structure of a display panel provided in an embodiment of this application;

[0034] Figure 6 A flowchart illustrating another method for manufacturing a display panel as provided in an embodiment of this application. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art are within the scope of protection of this application.

[0036] like Figure 1 , Figure 2As shown, an embodiment of the first aspect of this application proposes a display panel 100, including a plurality of pixel units, each pixel unit including a red area 101, a green area 102, and a blue area 103; the display panel 100 includes a substrate 110, a blue light-emitting device 120, an encapsulation layer 130, a quantum dot film 140, and a light conversion layer 150. The blue light-emitting device 120 is disposed on the substrate 110, the encapsulation layer 130 is disposed on the side of the blue light-emitting device 120 away from the substrate 110, and the quantum dot film 140 is disposed on the side of the encapsulation layer 130 away from the substrate 110. The quantum dot film 140 includes a red quantum dot color area 141, a green quantum dot color area 142, and a light-transmitting layer. Region 143, red quantum dot color region 141 is located in red region 101, red quantum dot color region 141 emits red light when excited by blue light emitted by blue light emitted by blue light emitting device 120, green quantum dot color region 142 is located in green region 102, green quantum dot color region 142 emits green light when excited by blue light emitted by blue light emitting device 120, light-transmitting region 143 is located in blue region 103, light-transmitting region 143 is configured to transmit blue light emitted by blue light emitting device 120, light conversion layer 150 is disposed between encapsulation layer 130 and quantum dot film 140, light conversion layer 150 is configured to emit blue light after being excited by either red light or green light, light conversion layer 150 includes upconversion light emitting material.

[0037] It should be understood that the substrate 110 includes a substrate and a driving circuit layer. The driving circuit layer includes multiple driving transistors, which can be thin-film transistors (TFTs). These TFTs can be top-gate or bottom-gate type. Taking a top-gate TFT as an example, the TFT includes an active layer, a first insulating layer, a gate, a second insulating layer, a source, and a drain. The active layer is disposed on the substrate, the first insulating layer is disposed on the substrate and covers the active layer, the gate is disposed on the side of the first insulating layer away from the substrate, the second insulating layer is disposed on the first insulating layer and covers the gate, and the source and drain are disposed on the second insulating layer and connected to the active layer through vias in the second insulating layer. The red quantum dot color region 141 and the green quantum dot color region 142 of the quantum dot thin film 140 can be adjacent or separated by the light-transmitting region 143.

[0038] like Figure 1As shown, in the display panel 100 provided in this embodiment, the downward-emitted red and green light is converted into blue light by the light conversion layer 150, shortening the optical path of the light emitted downward from the red quantum dot color region 141 and the green quantum dot color region 142, thereby reducing the superposition and interference between different colors of light emitted by the quantum dot film 140 and improving the color purity of the display panel 100. Specifically, when the display panel 100 is working, the blue light A emitted by the blue light-emitting device 120 penetrates the light conversion layer 150 and excites the red quantum dot color region 141 and the green quantum dot color region 142 of the quantum dot film 140 to emit red light B and green light C, respectively. The excited red light B and green light C are emitted in various directions. Among them, the red light B and green light C emitted downward and reaching the light conversion layer 150 are converted into blue light A, thereby shortening the optical path of the light emitted downward from the red quantum dot color region 141 and the green quantum dot color region 142, reducing the superposition and interference between the red and green light emitted by the quantum dot film, and thus improving the color purity of the display panel. Furthermore, the converted blue light A can be used to excite the quantum dot film to emit red light B and green light C, thereby improving the light emission efficiency of the display panel 100.

[0039] In some embodiments of this application, the orthogonal projection of the light conversion layer 150 onto the substrate 110 covers at least the red region 101 and the green region 102. Since the red quantum dot color region 141 is located in the red region 101 and the green quantum dot color region 142 is located in the green region 102, by making the orthogonal projection of the light conversion layer 150 onto the substrate 110 cover at least the red region 101 and the green region 102, the amount of red and green light reaching the light conversion layer 150 and being converted can be increased, thereby reducing the superposition and interference between the red and green light emitted by the quantum dot film 140 and improving the color purity of the display panel 100.

[0040] In some embodiments of this application, such as Figure 1 As shown, the orthographic projection of the light conversion layer 150 onto the substrate 110 covers the red area 101 and the green area 102. The display panel 100 also includes a light-transmitting layer 180, which is co-located with the light conversion layer 150. The orthographic projection of the light-transmitting layer 180 onto the substrate 110 covers the blue area 103. The light-transmitting layer 180 is configured to transmit blue light emitted by the blue light-emitting device 120. It is understood that the thickness of the light-transmitting layer 180 and the light conversion layer 150 can be the same, or the light-transmitting layer 180 can partially cover the light conversion layer 150. A planarization layer can be provided on the side of the light conversion layer 150 away from the substrate 110 to compensate for the thickness difference between the light conversion layer 150 and the light-transmitting layer 180 on the side away from the substrate 110, thereby facilitating the formation of the quantum dot film 140 and ensuring the thickness uniformity of the quantum dot film 140. In addition, the orthographic projection of the light-transmitting layer 180 onto the substrate 110 covers the blue area 103, which can improve the transmittance of the display panel 100 to blue light.

[0041] In some embodiments of this application, such as Figure 2 As shown, a groove 1301 is formed on the surface of the thin-film encapsulation (TFE) 130 near the quantum dot film 140, and the light conversion layer 150 is disposed within the groove 1301. By forming the groove 1301 on the surface of the encapsulation layer 130 near the quantum dot film 140 and disposing of the light conversion layer 150 within the groove 1301, the color purity of the display panel 100 can be improved while reducing the overall thickness of the display panel 100. It can be understood that when the red quantum dot color area 141 and the green quantum dot color area 142 of the quantum dot film 140 are adjacently distributed, the groove 1301 can be formed on the surface of the encapsulation layer 130 near the quantum dot film 140, in the area corresponding to the red quantum dot color area 141 and the green quantum dot color area 142, and the light conversion layer 150 can be disposed within the groove 1301.

[0042] In some embodiments of this application, such as Figure 2 As shown, the encapsulation layer 130 includes a first inorganic layer 131, an organic layer 132, and a second inorganic layer 133 sequentially stacked along the direction close to the quantum dot film 140. A groove 1301 is formed on the surface of the second inorganic layer 133 close to the quantum dot film 140. The depth of the groove 1301 is less than the thickness of the second inorganic layer 133. This ensures the encapsulation effect of the encapsulation layer 130 on the blue light-emitting device 120 and extends the service life of the display panel 100.

[0043] In some embodiments of this application, the upconversion luminescent material is a solid compound doped with rare earth elements.

[0044] In some embodiments, the solid compound is any one or a mixture of sulfides, fluorides, tellurates, bismuthates and phosphates, and the rare earth element is any one or a mixture of two of Tm and Yb.

[0045] In some embodiments, the solid compound is a pentaphosphate and the rare earth element is Tm. This type of upconversion luminescent material can emit 450nm light when excited by either red or green light.

[0046] In some embodiments, the solid compound is a fluoride, and the rare earth elements are Yb and Tm. This type of upconversion luminescent material can emit light at 455 nm or 480 nm when excited by either red or green light.

[0047] In some embodiments of this application, the light-transmitting layer 180 is a solid compound, such as any one or a mixture of sulfides, fluorides, tellurates, bismuthates and phosphates.

[0048] In some embodiments of this application, the blue light-emitting device 120 may be a blue OLED, a blue MicroLED, or a blue OLED lamp, and this application does not limit it. Taking a blue OLED as an example, the blue OLED includes a first electrode layer, a blue light EL layer, a second electrode layer, and a CPL layer sequentially disposed along the direction away from the substrate 110. The CPL layer and the encapsulation layer 130 work together to effectively isolate water and oxygen, extending the lifespan of the blue light OLED.

[0049] In some embodiments, the wavelength range of blue light in this application is 450 to 480 nm, wherein the wavelength of blue light emitted by the blue light-emitting device 120 and the wavelength of blue light emitted by the upconversion light-emitting material after being excited by either red light or green light both fall within this range.

[0050] like Figure 3 As shown, an embodiment of the second aspect of this application also provides a method for manufacturing a display panel, for manufacturing the display panel 100 provided in the embodiment of the first aspect of this application. The display panel 100 includes a plurality of pixel units, each pixel unit including a red area 101, a green area 102 and a blue area 103. The manufacturing method includes:

[0051] S101, Provide substrate 110;

[0052] S102, A blue light-emitting device 120 is formed on the substrate 110;

[0053] S103. An encapsulation layer 130 is formed on the blue light-emitting device 120;

[0054] S104. A light conversion layer 150 is formed on the encapsulation layer 130. The light conversion layer 150 is configured to emit blue light after being excited by either red light or green light. The light conversion layer 150 includes an upconversion luminescent material.

[0055] S105. Form a quantum dot thin film 140. The quantum dot thin film 140 includes a red quantum dot color region 141, a green quantum dot color region 142, and a light-transmitting region 143. The red quantum dot color region 141 is located in the red region 101 and emits red light when excited by the blue light emitted by the blue light-emitting device 120. The green quantum dot color region 142 is located in the green region 102 and emits green light when excited by the blue light emitted by the blue light-emitting device 120. The light-transmitting region 143 is located in the blue region 103 and is configured to transmit the blue light emitted by the blue light-emitting device 120.

[0056] According to the method for manufacturing a display panel according to an embodiment of this application, a light conversion layer 150 is formed on the encapsulation layer 130. Therefore, when the display panel is operating, the light conversion layer 150 converts the red and green light emitted downwards from the red quantum dot color region 141 and the green quantum dot color region 142, respectively, into blue light. This shortens the optical path of the light emitted downwards from the red and green quantum dot color regions 141 and 142, reduces the superposition and interference between different colors of light emitted from the quantum dot film 140, and thus improves the color purity of the display panel. Furthermore, the converted blue light can re-excite the quantum dot film to emit red and green light, thereby improving the light extraction efficiency of the display panel.

[0057] In some embodiments of this application, in step S104 above, forming the light conversion layer 150 on the encapsulation layer 130 includes: forming a groove 1301 on the surface of the encapsulation layer 130 near the quantum dot film 140, and forming the light conversion layer 150 within the groove 1301. By forming the groove 1301 on the encapsulation layer 130 and forming the light conversion layer 150 within the groove 1301, the thickness of the display panel 100 can be reduced. It is understood that when the red quantum dot color area 141 and the green quantum dot color area 142 of the quantum dot film 140 are adjacently distributed, the groove 1301 can be formed on the side of the encapsulation layer 130 near the quantum dot film 140, in the area corresponding to the red quantum dot color area 141 and the green quantum dot color area 142, and the light conversion layer 150 is disposed within the groove 1301, thereby simplifying the manufacturing process and reducing manufacturing costs.

[0058] like Figure 4As shown, an embodiment of the third aspect of this application provides a display panel 100, including a plurality of pixel units. Each pixel unit includes a red area 101, a green area 102, and a blue area 103. The display panel 100 includes a substrate 110, a blue light-emitting device 120, an encapsulation layer 130, a quantum dot film 140, a first sub-conversion layer 160, a second sub-conversion layer 170, and a light-transmitting layer 180. The blue light-emitting device 120 is disposed on the substrate 110, and the encapsulation layer 130 is disposed on the blue light-emitting device 120. On the side of the encapsulation layer 130 away from the substrate 110, a quantum dot film 140 is disposed. The quantum dot film 140 includes a red quantum dot color region 141, a green quantum dot color region 142, and a light-transmitting region 143. The red quantum dot color region 141 is located in the red region 101 and emits red light when excited by the blue light emitted by the blue light-emitting device 120. The green quantum dot color region 142 is located in the green region 102 and emits red light when excited by the blue light emitted by the blue light-emitting device 120. The device emits green light when excited by blue light. The light-transmitting region 143 is located in the blue region 103 and is configured to transmit the blue light emitted by the blue light-emitting device 120. A first sub-conversion layer 160 is disposed between the encapsulation layer 130 and the quantum dot film 140. The orthographic projection of the first sub-conversion layer 160 onto the substrate 110 covers the red region 101. The first sub-conversion layer 160 is configured to emit blue light when excited by red light. The first sub-conversion layer 160 includes a first upconversion light-emitting material. A second sub-conversion layer 170 is disposed in the encapsulation layer. Between 130 and quantum dot film 140, the orthogonal projection of second sub-conversion layer 170 on substrate 110 covers green region 102. Second sub-conversion layer 170 is configured to emit blue light after being excited by green light. Second sub-conversion layer 170 includes second upconversion light-emitting material. Light-transmitting layer 180 is disposed in the same layer as first sub-conversion layer 160 and second sub-conversion layer 170. Orthogonal projection of light-transmitting layer 180 on substrate 110 covers blue region 103. Light-transmitting layer 180 is configured to transmit blue light emitted by blue light-emitting device 120.

[0059] like Figure 4As shown, in the display panel 100 provided in this application embodiment, by setting the first sub-conversion layer 160 and the second sub-conversion layer 170, red light and green light can be better converted into blue light, thereby shortening the optical path of the light emitted downward from the red quantum dot color area 141 and the green quantum dot color area 142, thereby reducing the superposition and interference between different colors of light emitted from the quantum dot film 140, and improving the color purity of the display panel 100. Specifically, when the display panel 100 is working, the blue light A emitted by the blue light-emitting device 120 penetrates the first sub-conversion layer 160 and the second sub-conversion layer 170 respectively, exciting the red quantum dot color area 141 and the green quantum dot color area 142 of the quantum dot film 140 to emit red light B and green light C respectively. The excited red light B and green light C are emitted in various directions. Among them, the downward emitted red light B and green light C reach the first sub-conversion layer 160 and the second sub-conversion layer 170 respectively and are converted into blue light A, thereby shortening the optical path of the light emitted downward from the red quantum dot color area 141 and the green quantum dot color area 142, reducing the mutual superposition and interference between the red and green light emitted by the quantum dot film 140, and thus improving the color purity of the display panel. In addition, the converted blue light A can excite the quantum dot film to emit red light B and green light C, thereby improving the light emission efficiency of the display panel. Furthermore, the orthogonal projection of the light-transmitting layer 180 on the substrate 110 covers the blue area 103, which can improve the transmittance of the display panel 100 to blue light.

[0060] Understandably, the red quantum dot color region 141 and the green quantum dot color region 142 of the quantum dot film 140 can be distributed adjacently or separated by the light-transmitting region 143. The thickness of the light-transmitting layer 180 can be the same as that of the first sub-conversion layer 160 and the second sub-conversion layer 170, or the light-transmitting layer 180 can partially cover the first sub-conversion layer 160 and / or the second sub-conversion layer 170. A planarization layer can be provided on the side of the first sub-conversion layer 160 and / or the second sub-conversion layer 170 away from the substrate 110 to compensate for the thickness difference between the first sub-conversion layer 160 and / or the second sub-conversion layer 170 and the light-transmitting layer 180 on the side away from the substrate 110, thereby facilitating the formation of the quantum dot film 140 and ensuring the uniformity of the thickness of the quantum dot film 140.

[0061] In some embodiments of this application, such as Figure 5As shown, a first groove 1302 and a second groove 1303 are formed on the surface of the encapsulation layer 130 near the quantum dot film 140. The first groove 1302 corresponds to the red area 101, and the second groove 1303 corresponds to the green area 102. The first sub-conversion layer 160 is disposed in the first groove 1302, and the second light conversion layer 170 is disposed in the second groove 1303. At this time, the light-transmitting layer 180 is the part of the encapsulation layer 130 that is disposed in the same layer as the first sub-conversion layer 160 and the second sub-conversion layer 170. In this way, the color purity of the display panel 100 can be improved while the overall thickness of the display panel 100 can be reduced.

[0062] In some embodiments of this application, such as Figure 5 As shown, the encapsulation layer 130 includes a first inorganic layer 131, an organic layer 132, and a second inorganic layer 133 sequentially stacked along the direction close to the quantum dot film 140. The first groove 1302 and the second groove 1303 are both formed on the surface of the second inorganic layer 133 close to the quantum dot film 140. The depth of the first groove 1302 and the second groove 1303 is less than the thickness of the second inorganic layer 133. Thus, the encapsulation effect of the encapsulation layer 130 on the blue light emitting device 120 is guaranteed, and the service life of the display panel 100 is extended.

[0063] In some embodiments of this application, the first upconversion luminescent material is a solid compound doped with rare earth elements, wherein the solid compound is one or a mixture of two of fluorides and sulfides, and the rare earth elements are any one or a mixture of two of Tm and Yb.

[0064] The second upconversion luminescent material is a solid compound doped with rare earth elements, specifically a bismuthate and Ho as the rare earth element.

[0065] In some embodiments of this application, the light-transmitting layer 180 is a solid compound, such as any one or a mixture of sulfides, fluorides, tellurates, bismuthates and phosphates.

[0066] In some embodiments of this application, the blue light wavelength range is 450nm to 480nm. Specifically, the blue light wavelength emitted by the blue light emitting device 120, the blue light emitted by the first upconversion luminescent material after being excited by red light, and the blue light emitted by the second upconversion luminescent material after being excited by green light all fall within this range.

[0067] like Figure 6 As shown, an embodiment of the fourth aspect of this application also provides a method for manufacturing a display panel, for manufacturing the display panel 100 provided in the embodiment of the third aspect of this application. The display panel 100 includes a plurality of pixel units, each pixel unit including a red area 101, a green area 102 and a blue area 103. The manufacturing method includes:

[0068] S201, Provide substrate 110;

[0069] S202, A blue light-emitting device 120 is formed on the substrate 110;

[0070] S203. An encapsulation layer 130 is formed on the blue light-emitting device 120;

[0071] S204. A first sub-conversion layer 160, a second sub-conversion layer 170, and a light-transmitting layer 180 are formed on the encapsulation layer 130. The orthographic projection of the first sub-conversion layer 160 on the substrate 110 covers the red region 101. The first sub-conversion layer 160 is configured to emit blue light after being excited by red light. The first sub-conversion layer 160 includes a first upconversion light-emitting material. The orthographic projection of the second sub-conversion layer 170 on the substrate 110 covers the green region 102. The second sub-conversion layer 170 is configured to emit blue light after being excited by green light. The second sub-conversion layer 170 includes a second upconversion light-emitting material. The orthographic projection of the light-transmitting layer 180 on the substrate 110 covers the blue region 103. The light-transmitting layer 180 is configured to transmit blue light emitted by the blue light-emitting device 120.

[0072] S205. Form a quantum dot thin film 140. The quantum dot thin film 140 includes a red quantum dot color region 141, a green quantum dot color region 142, and a light-transmitting region 143. The red quantum dot color region 141 is located in the red region 101 and emits red light when excited by the blue light emitted by the blue light-emitting device 120. The green quantum dot color region 142 is located in the green region 102 and emits green light when excited by the blue light emitted by the blue light-emitting device 120. The light-transmitting region 143 is located in the blue region 103 and is configured to transmit the blue light emitted by the blue light-emitting device 120.

[0073] According to the method for manufacturing a display panel according to an embodiment of this application, a first sub-conversion layer 160 and a second sub-conversion layer 170 are formed on the encapsulation layer 130. The orthographic projection of the first sub-conversion layer 160 on the substrate 110 covers the red region 101, and the orthographic projection of the second sub-conversion layer 170 on the substrate 110 covers the green region 102. The formed quantum dot film 140 includes a red quantum dot color region 141, a green quantum dot color region 141, and a light-transmitting region 143. The red quantum dot color region 141 is located in the red region 101, and the green quantum dot color region 142 is located in the green region 102. Therefore, when the display panel is working, the first sub-conversion layer 160 converts the red light emitted downwards from the red quantum dot color region 141 into blue light, and the second sub-conversion layer 170 converts the green light emitted downwards from the green quantum dot color region 142 into blue light. This shortens the optical path of the light emitted downwards from the red quantum dot color region 141 and the green quantum dot color region 142, reduces the superposition and interference between different colors of light emitted by the quantum dot film 140, and thus improves the color purity of the display panel. In addition, the converted blue light can re-excite the quantum dot film to emit red and green light, thereby improving the light extraction efficiency of the display panel. Furthermore, the orthographic projection of the light-transmitting layer 180 onto the substrate 110 covers the blue region 103, and the light-transmitting region 143 on the quantum dot film 140 is located in the blue region 103, thereby improving the transmittance of the display panel to blue light.

[0074] In some embodiments of this application, in step S204 above, forming a first sub-conversion layer 160, a second sub-conversion layer 170, and a light-transmitting layer 180 on the encapsulation layer 130 includes:

[0075] A first groove 1302 and a second groove 1303 are formed on the surface of the encapsulation layer 130 near the quantum dot film 140. A first sub-conversion layer 160 and a second sub-conversion layer 170 are formed in the first groove 1302 and the second groove 1303, respectively. At this time, the part of the encapsulation layer 130 that is disposed in the same layer as the first sub-conversion layer 160 and the second sub-transition layer 170 is the light-transmitting layer 180. That is, there is no need to prepare the light-transmitting layer 180 separately, which can simplify the manufacturing process and reduce the manufacturing cost.

[0076] An embodiment of the fifth aspect of this application provides a display device, including a display panel 100 provided in the embodiments of the first aspect of this application or the embodiments of the third aspect of this application.

[0077] The specific type of display device is not particularly limited, and any type of display device commonly used in the art is acceptable, such as mobile phones, tablets, televisions, monitors, laptops, digital photo frames, navigators, and any other products or components with display functions. Those skilled in the art can make appropriate selections according to the specific purpose of the display device, which will not be elaborated here.

[0078] It should be noted that, in addition to the display panel, the display device also includes other necessary components and parts, such as the housing, circuit board, power cord, etc., which are for the purpose of displaying the device. Those skilled in the art can make corresponding additions according to the specific usage requirements of the display device, which will not be elaborated here.

[0079] Compared with the prior art, the beneficial effects of the display device provided in this application embodiment are the same as the beneficial effects of the display panel 100 provided in the above embodiment, and will not be repeated here.

[0080] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0081] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0082] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A display panel, characterized by, The display panel comprises a plurality of pixel units, each of the pixel units comprising a red region, a green region and a blue region; The display panel comprises a substrate; A blue light emitting device disposed on the substrate; An encapsulation layer disposed on a side of the blue light emitting device away from the substrate; A quantum dot film disposed on a side of the encapsulation layer away from the substrate, the quantum dot film comprising a red quantum dot color region, a green quantum dot color region and a light transmission region, the red quantum dot color region being located in the red region, the red quantum dot color region emitting red light under excitation of blue light emitted by the blue light emitting device, the green quantum dot color region being located in the green region, the green quantum dot color region emitting green light under excitation of blue light emitted by the blue light emitting device, the light transmission region being located in the blue region, the light transmission region being configured to transmit the blue light emitted by the blue light emitting device; A light conversion layer disposed between the encapsulation layer and the quantum dot film, the light conversion layer being configured to emit blue light under excitation of either of red light and green light, the light conversion layer comprising an up-conversion luminescent material; a normal projection of the light conversion layer on the substrate covering at least the red region and the green region, the blue light emitted by the blue light emitting device penetrating the light conversion layer, the light conversion layer converting the red light and the green light emitted downward by the red quantum dot color region and the green quantum dot color region into blue light.

2. The display panel of claim 1, wherein: A normal projection of the light conversion layer on the substrate covers the red region and the green region; The display panel further comprises a light transmission layer, the light transmission layer being disposed in the same layer as the light conversion layer, a normal projection of the light transmission layer on the substrate covering the blue region, the light transmission layer being configured to transmit the blue light emitted by the blue light emitting device.

3. The display panel of claim 1, wherein, The light conversion layer comprises a first sub-conversion layer and a second sub-conversion layer, a normal projection of the first sub-conversion layer on the substrate covering the red region, the first sub-conversion layer being configured to emit blue light under excitation of red light, the first sub-conversion layer comprising a first up-conversion luminescent material, a normal projection of the second sub-conversion layer on the substrate covering the green region, the second sub-conversion layer being configured to emit blue light under excitation of green light, the second sub-conversion layer comprising a second up-conversion luminescent material; The display panel further comprises a light transmission layer, the light transmission layer being disposed in the same layer as the first and second sub-conversion layers, a normal projection of the light transmission layer on the substrate covering the blue region, the light transmission layer being configured to transmit the blue light emitted by the blue light emitting device.

4. The display panel of claim 1, wherein, A surface of the encapsulation layer close to the quantum dot film is provided with a groove, and the light conversion layer is disposed in the groove.

5. The display panel of claim 4, wherein, The encapsulation layer comprises a first inorganic layer, an organic layer and a second inorganic layer stacked in sequence in a direction close to the quantum dot film, the groove being formed in a surface of the second inorganic layer close to the quantum dot film, and a depth of the groove being less than a thickness of the second inorganic layer.

6. The display panel of claim 1 or 2, wherein, The up-conversion luminescent material is a solid compound doped with a rare earth element.

7. The display panel of claim 6, wherein, The solid compound is a mixture of any one or more of sulfides, fluorides, tellurates, bismuthates and phosphates, and the rare earth element is any one or a mixture of both of Tm and Yb.

8. The display panel of claim 6, wherein, The solid compound is a pentaphosphate, and the rare earth element is Tm.

9. The display panel of claim 6, wherein, The solid compound is a fluoride, and the rare earth element is Yb and Tm.

10. The display panel of claim 3, wherein, The first up-conversion luminescent material is a solid compound doped with a rare earth element, the solid compound is a mixture of one or both of a fluoride and a sulfide, and the rare earth element is any one or a mixture of both of Tm and Yb. The second up-conversion luminescent material is a solid compound doped with a rare earth element, the solid compound is a bismuthate, and the rare earth element is Ho.

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