Display panel, preparation method thereof and display device

Abstract

The display panel provided by the present disclosure comprises a first substrate, a light emitting unit array and a light conversion color film array, the light emitting unit array comprises a plurality of light emitting units, the light conversion color film array comprises a plurality of light conversion color films, the light emitting units are used for generating and emitting first color light, the light conversion color films are used for generating other color light under the excitation of the first color light, the display panel further comprises a first band-pass filter layer located between the light emitting unit array and the light conversion color film array and / or a second band-pass filter layer located on a side of the light conversion color film array away from the light emitting unit array; the first band-pass filter layer comprises a first light condensing structure and a first band-pass filter structure located on a side of the first light condensing structure away from the first substrate; the second band-pass filter layer comprises a second light condensing structure and a second band-pass filter structure located on a side of the second light condensing structure away from the first substrate. The present disclosure further provides a preparation method of the display panel and a display device.

Description

Technical Field

[0001] This disclosure relates to the field of displays, and in particular to a display panel, a method for manufacturing the same, and a display device. Background Technology

[0002] With the continuous development of display technology, people have increasingly higher requirements for the display quality of display devices. As a new type of light-emitting material, light conversion material has the advantages of concentrated emission spectrum, high color purity, and easy adjustment of emission color through the size, structure, or composition of the light conversion material. Light conversion ink, after solution processing, spin coating, or inkjet printing, is further cured into a film to form a light conversion color film, which is a new generation of light-emitting material for solid-state lighting and full-color flat panel displays.

[0003] The display principle of a light-conversion display device is as follows: the light-emitting unit generates light and illuminates the light-conversion color filter, thereby exciting the light-conversion color filter to emit other colors of light, thus achieving color display. However, in practical applications, it has been found that the light extraction rate (the ratio of the light intensity emitted by the light-conversion color filter area to the light intensity emitted by the corresponding light-emitting unit) of existing light-conversion display devices is relatively low. Summary of the Invention

[0004] This disclosure aims to at least solve the technical problem of low light conversion efficiency of light conversion color filters in the prior art, and proposes a display panel, its preparation method and display device.

[0005] In a first aspect, embodiments of this disclosure provide a display panel, comprising: a first substrate, an array of light-emitting units, and an array of light-converting color filters. The array of light-emitting units is located on one side of the first substrate and includes multiple light-emitting units. The array of light-converting color filters is located on the side of the array away from the first substrate and includes multiple light-converting color filters. One light-converting color filter corresponds to one light-emitting unit, and different light-converting color filters correspond to different light-emitting units. The light-emitting units are used to generate and emit a first color of light, and the light-converting color filters are used to generate other colors of light under the excitation of the first color of light. The display panel further includes:

[0006] A first bandpass filter layer, located between the light-emitting unit array and the light-converting color filter array, includes: a first light-collecting structure and a first bandpass filter structure located on the side of the first light-collecting structure away from the first substrate. The first light-collecting structure is configured to focus light, and the first bandpass filter structure is configured to transmit a first color light and reflect other colors of light; and / or...

[0007] The second bandpass filter layer is located on the side of the light conversion color filter array away from the light-emitting unit array, and includes: a second light-concentrating structure and a second bandpass filter structure located on the side of the second light-concentrating structure away from the first substrate. The second light-concentrating structure is configured to concentrate light, and the second bandpass filter structure is configured to transmit the other color light and reflect the first color light.

[0008] In some embodiments, the first focusing structure includes a plurality of first collimating lenses, each of which corresponds to a light-emitting unit.

[0009] In some embodiments, the system further includes a first transparent resin layer located between the light-emitting unit array and the light-converting color filter array, wherein the first collimating lens is embedded in the first transparent resin layer.

[0010] In some embodiments, the second light-concentrating structure includes a plurality of second collimating lenses, each of which corresponds to one of the light-converting color filters.

[0011] In some embodiments, the system further includes: a second transparent resin layer located on the side of the light conversion color filter array away from the light-emitting unit array, wherein the second collimating lens is embedded in the second transparent resin layer.

[0012] In some embodiments, the first light-concentrating structure includes: at least two layers of first light-concentrating films stacked together, wherein the refractive index of the first light-concentrating film closer to the first substrate is less than the refractive index of the first light-concentrating film farther from the first substrate.

[0013] In some embodiments, the second light-concentrating structure includes at least two layers of second light-concentrating films stacked together, wherein the refractive index of the second light-concentrating film closer to the first substrate is less than the refractive index of the second light-concentrating film farther from the first substrate.

[0014] In some embodiments, the first bandpass filter structure is a distributed Bragg reflection structure;

[0015] And / or, the second bandpass filter structure is a distributed Bragg reflection structure.

[0016] In some embodiments, the light conversion color filter array includes: a first light conversion color filter emitting a second color light and a second light conversion color filter emitting a third color light, wherein the other color light includes: the second color light and the third color light;

[0017] The first color light is blue light, the second color light is red light, and the third color light is green light.

[0018] In some embodiments, the first bandpass filter structure is configured to have a transmittance of more than 90% for light in the 400nm to 550nm band and to perform total internal reflection for light in the 550nm to 780nm band.

[0019] In some embodiments, the second bandpass filter structure is configured to have a transmittance of more than 90% for light in the 480nm to 800nm ​​band and to perform total internal reflection for light in the 380nm to 480nm band.

[0020] In some embodiments, the display panel is divided into multiple light-emitting areas, and each light-emitting area corresponds to a light-emitting unit.

[0021] The display panel further includes: a first pixel defining layer located on the side of the first substrate close to the light-emitting unit array and a first encapsulation layer located on the side of the first pixel defining layer away from the first substrate, wherein the first bandpass filter layer is located between the first encapsulation layer and the light conversion color filter array.

[0022] The first pixel defining layer is provided with a plurality of first receiving holes, each of which corresponds to a light-emitting area, and the light-emitting unit is located in the corresponding first receiving hole.

[0023] In some embodiments, the display panel is divided into multiple light-emitting areas, each of which corresponds to a light-emitting unit. The multiple light-emitting areas include: a first light-emitting area for emitting a first color light, a second light-emitting area for emitting a second color light, and a third light-emitting area for emitting a third color light.

[0024] The orthographic projection of the second bandpass filter layer onto the first substrate covers the second light-emitting region and the third light-emitting region but does not cover the first light-emitting region;

[0025] The display panel further includes: a second pixel defining layer located on the side of the light-emitting unit array away from the first substrate, the second pixel defining layer having a plurality of second receiving holes, the second receiving holes corresponding one-to-one with the light-emitting areas, the first light conversion color film and the second light conversion color film being located in the corresponding second receiving holes, and a transparent resin pattern being provided in the second receiving hole corresponding to the first light-emitting area.

[0026] In some embodiments, the display panel further includes: a second encapsulation layer located on the side of the second pixel defining layer close to the first substrate, a color resist layer located on the side of the second pixel defining layer away from the first substrate, a second substrate located on the side of the color resist layer away from the first substrate, a sealing adhesive located between the first substrate and the second substrate and in the peripheral region, and a second bandpass filter layer located between the color resist layer and the second pixel defining layer.

[0027] The color resist layer includes a black matrix and multiple color resists, the multiple color resists including a first color resist, a second color resist and a third color resist, the first color resist corresponds one-to-one with the first light-emitting region, the second color resist corresponds one-to-one with the second light-emitting region, and the third color resist corresponds one-to-one with the third light-emitting region.

[0028] In some embodiments, the display panel further includes: a second encapsulation layer located on the side of the second pixel defining layer away from the first substrate, a color resist layer located on the side of the second encapsulation layer away from the first substrate, a circular polarizer located on the side of the color resist layer away from the first substrate, and a protective film located on the side of the circular polarizer away from the first substrate.

[0029] The color resist layer includes a black matrix and multiple color resists, the multiple color resists including a first color resist, a second color resist and a third color resist, the first color resist corresponds one-to-one with the first light-emitting region, the second color resist corresponds one-to-one with the second light-emitting region, and the third color resist corresponds one-to-one with the third light-emitting region.

[0030] Secondly, embodiments of this disclosure also provide a display device, including: the display panel as described in the first aspect above.

[0031] Thirdly, embodiments of this disclosure also provide a method for manufacturing a display panel, which can be used to manufacture the display panel provided in the first aspect, the method comprising:

[0032] Fabricating a first display substrate includes: forming a light-emitting unit array on a first substrate, the light-emitting unit array including a plurality of light-emitting units, the light-emitting units being used to generate and emit a first color light;

[0033] Fabricating a second display substrate includes: forming a light-converting color filter array on a second substrate, the light-converting color filter array including a plurality of light-converting color filters, one light-converting color filter corresponding to one light-emitting unit and different light-converting color filters corresponding to different light-emitting units, the light-converting color filters being used to generate other colors of light under the excitation of the first color light;

[0034] The first display substrate and the second display substrate are assembled and fixed together, and the light-emitting unit array and the light-converting color filter array are located between the first substrate and the second substrate.

[0035] The process of preparing the second display substrate, and after the step of forming the light conversion color filter array, further includes: forming a first bandpass filter layer on the side of the light conversion color filter array away from the second substrate, the first bandpass filter layer including: a first bandpass filter structure and a first light-concentrating structure located on the side of the first bandpass filter structure away from the second substrate, the first light-concentrating structure being configured to concentrate light, and the first bandpass filter structure being configured to transmit a first color light and reflect other color light;

[0036] And / or, during the fabrication of the second display substrate and before the step of forming the light conversion color filter array, the method further includes: forming a second bandpass filter layer on the second substrate and on one side of the subsequent fabrication of the light conversion color filter array, the second bandpass filter layer comprising: a second bandpass filter structure and a second light-concentrating structure located on the side of the second bandpass filter structure away from the second substrate, the second light-concentrating structure being configured to concentrate light, and the second bandpass filter structure being configured to transmit the other color light and reflect the first color light.

[0037] Fourthly, embodiments of this disclosure also provide a method for manufacturing a display panel, which can be used to manufacture the display panel provided in the first aspect, the method comprising:

[0038] An array of light-emitting units is formed on a first substrate, the array of light-emitting units comprising a plurality of light-emitting units, the light-emitting units being used to generate and emit light of a first color;

[0039] A light-converting color filter array is formed on the side of the light-emitting unit array away from the first substrate. The light-converting color filter array includes multiple light-converting color filters. One light-converting color filter corresponds to one light-emitting unit, and different light-converting color filters correspond to different light-emitting units. The light-converting color filters are used to generate other colors of light when excited by the first color light.

[0040] Between the step of forming the light-emitting unit array and the step of forming the light conversion color filter array, the method further includes: forming a first bandpass filter layer on the side of the light-emitting unit array away from the first substrate. The first bandpass filter layer includes: a first light-concentrating structure and a first bandpass filter structure located on the side of the first light-concentrating structure away from the first substrate. The first light-concentrating structure is configured to concentrate light, and the first bandpass filter structure is configured to transmit a first color light and reflect other color light.

[0041] And / or, after the step of forming the light conversion color filter array, the method further includes: forming a second bandpass filter layer on the side of the light conversion color filter array away from the first substrate, the second bandpass filter layer including: a second light-concentrating structure and a second bandpass filter structure located on the side of the second light-concentrating structure away from the first substrate, the second light-concentrating structure being configured to concentrate light, and the second bandpass filter structure being configured to transmit the other color light and reflect the first color light. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure;

[0043] Figure 2 This is a schematic diagram of another display panel structure provided in an embodiment of the present disclosure;

[0044] Figure 3 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0045] Figure 4a This is a schematic diagram of a structure of the first bandpass filter layer in an embodiment of this disclosure;

[0046] Figure 4b This is a schematic diagram of a structure of the second bandpass filter layer in an embodiment of this disclosure;

[0047] Figure 5a This is a schematic diagram of another structure of the first bandpass filter layer in an embodiment of this disclosure;

[0048] Figure 5b This is a schematic diagram of another structure of the second bandpass filter layer in an embodiment of this disclosure;

[0049] Figure 6 This is a schematic diagram of another display panel provided in an embodiment of the present disclosure;

[0050] Figures 7a to 7d A schematic diagram of the intermediate structure for fabricating the first display substrate;

[0051] Figures 8a to 8f A schematic diagram of the intermediate structure for fabricating the second display substrate;

[0052] Figure 9 This is a schematic diagram of another display panel provided in an embodiment of the present disclosure;

[0053] Figures 10a to 10g This is a schematic diagram of the structure in which other functional film layers are directly fabricated on the first display substrate in an embodiment of this disclosure;

[0054] Figure 11 A flowchart illustrating a method for manufacturing a display panel according to an embodiment of this disclosure;

[0055] Figure 12 A flowchart illustrating another method for manufacturing a display panel provided in an embodiment of this disclosure. Detailed Implementation

[0056] To enable those skilled in the art to better understand the technical solutions of this disclosure, a display panel, its manufacturing method, and display device provided in this disclosure will be described in detail below with reference to the accompanying drawings.

[0057] Research has revealed that the low light extraction rate of the region with the light conversion color filter in the quantum dot display device provided by related technologies is due to at least the following reasons: First, the large-angle light emitted by the light-emitting unit has high reflectivity and low transmittance when passing through other functional film layers located between the light-emitting unit and the light conversion color filter, resulting in significant light loss during propagation; second, the light emitted by the light conversion color filter after excitation is scattered light (360° scattering), and some light rays fail to escape from the display panel; third, the light conversion efficiency of the light conversion color filter itself is low. Based on the above research findings, this disclosure provides a technical solution to improve the light extraction rate of the region with the light conversion color filter in the quantum dot display device.

[0058] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure, such as... Figure 1 As shown, the display panel is a quantum dot display panel, comprising: a first substrate 1, a light-emitting unit array, and a light-converting color filter array. The light-emitting unit array is located on one side of the first substrate 1 and includes multiple light-emitting units 2. The light-converting color filter array is located on the side of the light-emitting unit array away from the first substrate 1 and includes multiple light-converting color filters 3. Each light-converting color filter 3 corresponds to one light-emitting unit 2, and different light-converting color filters 3 correspond to different light-emitting units 2. The light-emitting units 2 are used to generate and emit a first color light, and the light-converting color filters 3 are used to generate other colors of light under the excitation of the first color light. The wavelength of the first color light is shorter than the wavelength of the other colors of light.

[0059] In this embodiment, the light-emitting unit 2 includes an organic light-emitting diode (OLED). The OLED includes a cathode and an anode disposed opposite each other, and an organic functional layer located between the cathode and anode. The organic functional layer includes at least an organic light-emitting layer, and may also include functional film layers such as a hole transport layer, a hole blocking layer, an electron transport layer, and an electron blocking layer, depending on actual needs. Generally, each light-emitting unit 2 is configured with a corresponding driving circuit, which includes a driving transistor. The driving circuit is electrically connected to the corresponding light-emitting unit 2 to drive the light-emitting unit 2 to emit light.

[0060] In some embodiments, the material of the light conversion color filter 3 includes quantum dot materials.

[0061] The display panel further includes a first bandpass filter layer 4, located between the light-emitting unit array and the light conversion color filter array, comprising a first light-concentrating structure 41 and a first bandpass filter structure 42 located on the side of the first light-concentrating structure 41 away from the first substrate 1. The first light-concentrating structure 41 is configured to concentrate light, and the first bandpass filter structure 42 is configured to transmit first color light and reflect other color light.

[0062] In this embodiment, the first color light emitted by the light-emitting unit 2 is focused by the first light-concentrating structure 41 and then incident at a small angle (the angle between the light ray and the normal to the plane of the first substrate 1) onto the first bandpass filter structure 42. At this time, most or even all of the first color light can pass through the first bandpass filter structure 42 and be directed towards the light conversion color filter 3, thereby reducing light loss during light propagation. In addition, by focusing the light through the first light-concentrating structure 41, the light transmission effect of the first bandpass filter structure 42 on the first color light can also be improved, which will be described in detail below. After being irradiated by the first color light, the light conversion color filter 3 excites other colors of light and scatters them. Among them, the other colors of light facing away from the light-emitting side of the display panel are reflected after irradiating the first bandpass filter structure 42. The reflected light is emitted from the light-emitting side of the display panel, thereby increasing the light output of the area where the light conversion color filter 3 is located, and thus improving the light extraction rate of the area of ​​the light conversion color filter 3.

[0063] Figure 2 This is a schematic diagram of another display panel structure provided in an embodiment of the present disclosure, such as... Figure 2 As shown, with Figure 1 The difference is that the display panel shown is that... Figure 2 The display panel shown does not include the first bandpass filter layer 4, but does include a second bandpass filter layer 5. The second bandpass filter layer 5 is located on the side of the light conversion color filter array away from the light-emitting unit array. The second bandpass filter layer 5 includes a second light-concentrating structure 51 and a second bandpass filter structure 52 located on the side of the second light-concentrating structure 51 away from the first substrate 1. The second light-concentrating structure 51 is configured to concentrate light, and the second bandpass filter structure 52 is configured to transmit other colors of light and reflect the first color of light.

[0064] In this embodiment, other colors of light emitted by the light-converting color filter 3 are focused by the second focusing structure 51 and then incident at a small angle onto the second bandpass filter structure 52. At this time, most or even all of the other colors of light can pass through the second bandpass filter structure 52 and be directed towards the light-converting color filter 3, thereby reducing light loss during light propagation. In addition, by focusing the light through the second focusing structure 51, the reflection effect of the second bandpass filter structure 52 on the first color of light and the light transmission efficiency of other colors of light can be improved. This will be described in detail below. At the same time, some of the first color of light will pass through the light-converting color filter 3 and be directed towards the second bandpass filter layer 5. The first color of light directed towards the second bandpass filter layer 5 will be reflected by the second bandpass filter structure 52 and then be directed back towards the light-converting color filter 3 to excite the light-converting color filter 3 to emit other colors of light, thereby improving the light conversion efficiency of the light-converting color filter 3 and thus improving the light extraction efficiency of the region of the light-converting color filter 3.

[0065] Figure 3 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure, as shown below. Figure 3 As shown, Figure 3 The display panel shown also includes Figure 1 The first bandpass filter layer 4 and Figure 2 The second bandpass filter layer 5 is provided. In this embodiment of the present disclosure, by simultaneously providing the first bandpass filter layer 4 and the second bandpass filter layer 5, the light extraction efficiency of the light conversion color filter 3 region can be further improved.

[0066] Figure 4a This is a schematic diagram of a structure of the first bandpass filter layer 4 in an embodiment of this disclosure, as shown below. Figure 4a As shown, in some embodiments, the first bandpass filter structure 42 is a distributed Bragg reflector (DBR) structure. That is, the first bandpass filter structure 42 is formed by alternating layers of high-refractive-index films 421 and 423 (which can be fabricated from nanoscale materials) and low-refractive-index films 422 and 424 (which can be fabricated from nanoscale materials), achieving a filtering effect through light interference. When there are multiple layers of high-refractive-index films 421 and 423 and low-refractive-index films 422 and 424, the refractive indices of different high-refractive-index films 421 and 423 can be the same or different, and the refractive indices of different low-refractive-index films 422 and 424 can also be the same or different. It is only necessary to ensure that the refractive index of each high-refractive-index film 421 and 423 is greater than that of its adjacent low-refractive-index film 422 and 424, and that the refractive index of each low-refractive-index film 422 and 424 is less than that of its adjacent high-refractive-index film 421 and 423.

[0067] The thickness d of each thin film within the distributed Bragg reflector structure satisfies: q is a positive integer, λ is the center wavelength of the reflection band (also called the filter band), and θ is the angle of incidence. Therefore, given the values ​​of d, q, and n, the reflection and transmission bands of the distributed Bragg reflection structure will change for light rays with different angles of incidence. In practical applications, it has been found that when the angle θ increases, the reflection band shifts towards shorter wavelengths. That is, when designing the first bandpass filter structure 42 with a distributed Bragg reflection structure based on the bands of other colors of light as reflection waves, the first bandpass filter structure 42 will reflect the first color light incident at a large angle, causing the overall transmittance of the first color light to decrease. To address this, in this embodiment, the first bandpass filter structure 42 is used in conjunction with the first focusing structure 41. By focusing the first color light so that the first color light incident on the first bandpass filter structure 42 is at a small angle, the filtering of the first color light by the first bandpass filter structure 42 can be reduced, thereby improving the light transmittance of the first color light and improving the light extraction rate of the light conversion color filter 3 region.

[0068] Figure 4b This is a schematic diagram of a structure of the second bandpass filter layer 5 in an embodiment of this disclosure, as shown below. Figure 4b As shown, the second bandpass filter structure 52 has the same structure as the first bandpass filter structure 42, that is, the second bandpass filter structure 52 is formed by alternating layers of high refractive index thin films 521 and 523 (which can be prepared from nanoscale materials) and low refractive index thin films 522 and 524 (which can be prepared from nanoscale materials). Based on the same principle discussed above, in this embodiment, the second bandpass filter structure 52 is used in conjunction with the second focusing structure 51. By focusing the first color light transmitted through the light conversion color filter 3 and other color light generated by the light conversion color filter 3, the first color light and other color light incident on the second bandpass filter structure 52 are small-angle incident light, thereby improving the reflectivity of the second bandpass filter structure 52 for the first color light and the transmittance for other color light, which is beneficial to improving the light extraction rate of the light conversion color filter 3 region.

[0069] It should be noted that, Figure 4a Figure 4 only illustrates the case where the first bandpass filter structure 42 and the second bandpass filter structure 52 contain four stacked thin films. This case is only for illustrative purposes and does not limit the technical solution of this disclosure.

[0070] Continue to participate Figure 4aAs shown, in some embodiments, the first focusing structure 41 includes a plurality of first collimating lenses, each corresponding to a light-emitting unit 2. In some embodiments, the display panel further includes a first transparent resin layer 8 located between the light-emitting unit array and the light-converting color filter array, with the first collimating lens embedded in the first transparent resin layer 8. In some embodiments, the first collimating lens is a plano-convex lens, with its convex surface facing the first substrate 1 and its planar surface facing away from the first substrate 1.

[0071] Continue to participate Figure 4b As shown, in some embodiments, the second focusing structure 51 includes a plurality of second collimating lenses, each corresponding to a light-converting color filter 3. The display panel also includes a second transparent resin layer located on the side of the light-converting color filter array away from the light-emitting unit array, with the second collimating lenses embedded in the second transparent resin layer. In some embodiments, the second collimating lens is a plano-convex lens, with its convex surface facing the first substrate 1 and its planar surface facing away from the first substrate 1.

[0072] Figure 5a This is another schematic diagram of the structure of the first bandpass filter layer 4 in an embodiment of this disclosure, as shown below. Figure 5a As shown, with Figure 4a The first focusing structure 41 within the first bandpass filter layer 4 shown in the diagram uses a different collimating lens than the one shown in the diagram. Figure 5a The first focusing structure 41 within the first bandpass filter layer 4 shown adopts a thin-film stacked structure. Specifically, the first focusing structure 41 includes at least two stacked first focusing films 411 and 412. Among adjacent first focusing films, the refractive index of the first focusing film 411 closer to the first substrate 1 is less than the refractive index of the first focusing film 412 farther away from the first substrate 1. That is, in the direction away from the first substrate 1, the refractive indices of each first focusing film 411 and 412 increase sequentially. When light is refracted from an optically less dense medium to an optically denser medium, if the angle of incidence is greater than 0, the angle of refraction is smaller than the angle of incidence, thereby achieving a focusing effect.

[0073] Figure 5a The illustration shows an example of a first focusing structure 41 comprising two stacked first focusing films 411 and 412. This example is for illustrative purposes only and does not limit the technical solutions of this disclosure. Taking a medium with a refractive index n0 = 1.5 in contact with the lowermost first focusing film 411, a refractive index n1 = 1.78 for the lowermost first focusing film 411, and a refractive index n2 = 2.30 for the uppermost first focusing film 412 as an example, for light rays with an incident angle α0 = 50°, the angle of refraction after refracting into the lowermost first focusing film 411 is approximately α1 ≈ 40°, and the angle of refraction after refracting into the uppermost first focusing film 412 is approximately α2 ≈ 30°.

[0074] Figure 5b This is a schematic diagram of another structure of the second bandpass filter layer 5 in an embodiment of this disclosure, as shown below. Figure 5b As shown, with Figure 5a The structure of the first focusing structure 41 within the first bandpass filter layer 4 shown is similar. Figure 5b The second light-concentrating structure 51 in the second bandpass filter layer 5 shown includes at least two layers of second light-concentrating films 511 and 512 stacked together. The refractive index of the second light-concentrating film closer to the first substrate 1 is less than the refractive index of the second light-concentrating film farther away from the first substrate 1. Light concentration can be achieved through this stacked film structure. Figure 5b The illustration shows an example of the second light-concentrating structure 51 comprising two layers of second light-concentrating films 511 and 512 stacked together. This example is for illustrative purposes only and does not limit the technical solutions of this disclosure.

[0075] Figure 6 This is a schematic diagram of another display panel provided in an embodiment of the present disclosure, as shown below. Figure 6 As shown, Figure 6 The display panel shown includes a first bandpass filter layer 4 and a second bandpass filter layer 5, and the light conversion color filter array includes a first light conversion color filter 3 that emits a second color light and a second light conversion color filter 3 that emits a third color light. Other colors of light include the second color light and the third color light.

[0076] In some embodiments, the first color light is blue light, the second color light is red light, and the third color light is green light. The first light-converting color filter 3 is a red light-converting color filter 3r, and the second light-converting color filter 3 is a green light-converting color filter 3g. The blue light emitted by the light-emitting unit 2 excites the red light-converting color filter 3r to emit red light, and the blue light emitted by the light-emitting unit 2 excites the green light-converting color filter 3g to emit green light. In this case, the light-emitting unit 2 can be a blue organic light-emitting diode.

[0077] Furthermore, in some embodiments, the first bandpass filter structure 42 is configured to have a transmittance of more than 90% for light in the 400nm to 550nm wavelength band and to perform total internal reflection for light in the 550nm to 780nm wavelength band. In some embodiments, the second bandpass filter structure 52 is configured to have a transmittance of more than 90% for light in the 480nm to 800nm ​​wavelength band and to perform total internal reflection for light in the 380nm to 480nm wavelength band.

[0078] In some embodiments, the display panel is divided into multiple light-emitting areas, and each light-emitting area corresponds to a light-emitting unit 2. The display panel further includes a first pixel defining layer 16 located on the side of the first substrate 1 close to the light-emitting unit array and a first encapsulation layer 7 located on the side of the first pixel defining layer 16 away from the first substrate 1. A first bandpass filter layer 4 is located between the first encapsulation layer 7 and the light conversion color filter array. The first pixel defining layer 16 is provided with multiple first receiving holes, each first receiving hole corresponding to a light-emitting area, and the light-emitting unit 2 is located in the corresponding first receiving hole.

[0079] In some embodiments, the plurality of light-emitting regions include: a first light-emitting region for emitting a first color light, a second light-emitting region for emitting a second color light, and a third light-emitting region for emitting a third color light; that is, the first light-emitting region, the second light-emitting region, and the third light-emitting region are respectively a blue light-emitting region, a red light-emitting region, and a green light-emitting region. The orthographic projection of the second bandpass filter layer 5 on the first substrate 1 covers the second light-emitting region and the third light-emitting region but does not cover the first light-emitting region; the display panel further includes: a second pixel defining layer 10 located on the side of the light-emitting unit array away from the first substrate 1, the second pixel defining layer 10 is provided with a plurality of second receiving holes, the second receiving holes correspond one-to-one with the light-emitting regions, the first light conversion color filter 3 and the second light conversion color filter 3 are both located in the corresponding second receiving holes, and a transparent resin pattern 30b is provided in the second receiving hole corresponding to the first light-emitting region.

[0080] In some embodiments, the display panel further includes: a second encapsulation layer 9 located on the side of the second pixel defining layer 10 close to the first substrate 1, a color resist layer 11 located on the side of the second pixel defining layer 10 away from the first substrate 1, a second substrate 17 located on the side of the color resist layer 11 away from the first substrate 1, a sealing adhesive 13 located between the first substrate 1 and the second substrate 17 and in the peripheral area, and a second bandpass filter layer 5 located between the color resist layer 11 and the second pixel defining layer 10.

[0081] The color resist layer 11 includes a black matrix 18 and multiple color resists, including a first color resist, a second color resist, and a third color resist. The first color resist corresponds one-to-one with a first light-emitting region, the second color resist corresponds one-to-one with a second light-emitting region, and the third color resist corresponds one-to-one with a third light-emitting region. That is, the first color resist is a blue color resist 12b, the second color resist is a red color resist 12r, and the third color resist is a green color resist 12g.

[0082] Figure 6The display panel shown is a type of interlocking display panel, which is formed by interlocking a first display substrate and a second display substrate. The first display substrate includes: a first substrate 1, a driving layer 6, a first pixel defining layer 16, a light-emitting unit array, and a first encapsulation layer 7; the second display substrate includes: a second substrate 17, a color resist layer 11, a second bandpass filter layer 5, a second pixel defining layer 10, a light conversion color filter array, a second encapsulation layer 9, and a first bandpass filter layer 4. The first display substrate and the second display substrate can be interlocked and fixed by a first transparent resin layer 8, and the first substrate 1 and the second substrate 17 are sealed in the peripheral area by a sealing adhesive 13.

[0083] Figures 7a to 7d A schematic diagram of the intermediate structure for fabricating the first display substrate, as shown below. Figures 7a to 7d As shown, the manufacturing process of the first display substrate is as follows: First, a first substrate 1 is provided. The first substrate 1 can be a rigid glass substrate or a flexible resin substrate. Then, see... Figure 7a As shown, a driving layer 6 is fabricated on the first substrate 1 using a thin-film transistor (TFT) array process. The driving layer 6 includes a driving circuit, which includes a thin-film transistor (containing the driving transistor). The thin-film transistor can be an oxide thin-film transistor or a low-temperature polysilicon (LTPS) thin-film transistor. Specific process details are conventional in the art and will not be elaborated here. Then, see... Figure 7b As shown, a first pixel defining layer 16 is fabricated. The first pixel defining layer 16 can be made of a transparent resin material or a colored resin material, preferably made of a colored resin material, and more preferably made of a black resin material. The first pixel defining layer 16 defines a plurality of first receiving holes, each of which corresponds to a light-emitting region. In some embodiments, the size of the first receiving hole corresponding to the green light-emitting region (the cross-sectional area of ​​the light-emitting side of the receiving hole) is greater than or equal to the size of the first receiving hole corresponding to the red light-emitting region, and the size of the first receiving hole corresponding to the red light-emitting region is greater than or equal to the size of the first receiving hole corresponding to the blue light-emitting region. Next, see... Figure 7cAs shown, a light-emitting element is fabricated within the first receiving hole. Taking a blue organic light-emitting diode (OLED) as an example, the anode of the blue OLED shares the same layer as the drain of the driving transistor. In this case, only an organic functional layer capable of emitting blue light and a cathode need to be fabricated within the first receiving hole. In some embodiments, the anode of the OLED is made of a metallic material (e.g., molybdenum, aluminum, etc.) so that the anode serves as a reflective electrode, and the cathode is made of a transparent conductive material (e.g., indium tin oxide, indium gallium zinc oxide, etc.). In some embodiments, the overall thickness of the driving layer 6 and the OLED is 3µm to 4µm. Finally, see... Figure 7d As shown, a first encapsulation layer 7 is prepared. The first encapsulation layer 7 is a stacked structure composed of alternating inorganic and organic encapsulation films. For example, the first encapsulation layer 7 is a three-layer stacked structure of inorganic encapsulation film-organic encapsulation film-inorganic encapsulation film. The inorganic encapsulation film can be obtained by depositing silicon oxide and / or silicon nitride materials through chemical vapor deposition (CVD) process, and the thickness is generally 1 μm. The organic encapsulation film can be obtained by inkjet printing (IJP) organic materials, and the thickness is generally 6 μm to 8 μm. The organic encapsulation film can also play a planarization role.

[0084] Figures 8a to 8f A schematic diagram of the intermediate structure for fabricating the second display substrate, as shown below. Figures 8a to 8f As shown, the manufacturing process of the second display substrate is as follows: First, a second substrate 17 is provided. The second substrate 17 can be a rigid glass substrate or a flexible resin substrate. Then, see... Figure 8a As shown, a color resist layer 11 is fabricated on the second substrate 17; specifically, a black matrix 18 with a thickness of less than or equal to 2 μm is first fabricated; then, each color resist is fabricated separately, with a thickness of less than or equal to 3 μm; in some embodiments, the color resists include: a blue color resist 12b, a red color resist 12r, and a green color resist 12g. Then, see... Figure 8bAs shown, a second bandpass filter layer 5 is prepared. Specifically, a second bandpass filter structure 52 is formed by alternating deposition of nanoscale high-refractive-index resin material and nanoscale low-refractive-index resin material using plasma-enhanced chemical vapor deposition (PECVD), followed by the preparation of a second light-concentrating structure 51. In this embodiment, multiple second collimating lenses (e.g., plano-convex lenses) can be prepared by exposure and development to obtain the second light-concentrating structure 51, or multiple second light-concentrating films can be prepared by stacking them, with the refractive index of each second light-concentrating film decreasing sequentially in the direction away from the second substrate 17. The second bandpass filter layer 5 completely covers the red light emitting region and the green light emitting region, but does not cover the blue light emitting region. It should be noted that when the second light-concentrating structure 51 includes multiple second collimating lenses, a second transparent resin layer is prepared above the second collimating lenses to achieve planarization in order to ensure the preparation of the subsequent film layer. In this case, the second collimating lenses are embedded in the second transparent resin layer. Next, see Figure 8c As shown, a second pixel defining layer 10 is fabricated, and a plurality of second receiving holes are provided on the second pixel defining layer 10, with each second receiving hole corresponding to a light-emitting region. In some embodiments, the dihedral angle β formed by the sidewall portion of the second pixel defining layer 10 used to form the second receiving hole and the bottom plane of the second receiving hole is in the range of 80° to 120°, preferably 90° to 110°, and the thickness of the second pixel defining layer 10 is 6µm to 12µm. In some embodiments, the size of the second receiving hole corresponding to the green light-emitting region (the cross-sectional area of ​​the light-emitting side of the receiving hole) is greater than or equal to the size of the second receiving hole corresponding to the red light-emitting region, and the size of the second receiving hole corresponding to the red light-emitting region is greater than or equal to the size of the second receiving hole corresponding to the blue light-emitting region. In addition, some isolation dams 19 can be provided above the second pixel defining layer 10 that forms the second receiving holes corresponding to the red light-emitting region and the second receiving holes corresponding to the green light-emitting region to prevent the mixing of green quantum dot materials and red quantum dot materials during the subsequent fabrication of the green light conversion color film 3g and the red light conversion color film 3r. In addition, a reflective metal layer (not shown) can be provided on the sidewalls surrounding the second receiving hole to increase the amount of light emitted. Next, see... Figure 8dAs shown, a red light conversion color film 3r and a green light conversion color film 3g are fabricated in the second receiving hole corresponding to the red light emitting region and the second receiving hole corresponding to the green light emitting region, respectively. A transparent resin pattern 30b is fabricated in the second receiving hole corresponding to the blue light emitting region. Scattering particles are doped into the light conversion color film 3 and the transparent resin pattern 30b to ensure the consistency of the viewing angle of each emitting region. The thickness of the light conversion color film 3 and the transparent resin pattern 30b is 6µm to 12µm, similar to the thickness of the second pixel defining layer 10. The curing temperature of the resin material in the light conversion color film 3 and the resin material in the transparent resin pattern 30b is less than or equal to 180°C. Next, see... Figure 8e As shown, a second encapsulation layer 9 is prepared; in some embodiments, the refractive index of the second encapsulation layer 9 is between 1.7 and 2.0, preferably between 1.75 and 1.85; the thickness of the second encapsulation layer 9 is less than 1 μm, preferably less than 0.5 μm. Finally, referring to 8f, a first bandpass filter layer 4 is prepared; specifically, a first bandpass filter structure 42 is formed by alternating deposition of nanoscale high-refractive-index resin material and nanoscale low-refractive-index resin material by plasma-enhanced chemical vapor deposition; then a first light-concentrating structure 41 is prepared; in the embodiments of this disclosure, multiple first collimating lenses (e.g., plano-convex lenses) can be prepared by exposure and development to obtain the first light-concentrating structure 41, or multiple first light-concentrating films can be prepared by stacking multiple first light-concentrating films, and the refractive index of each first light-concentrating film decreases sequentially in the direction away from the first substrate 1 to obtain the first light-concentrating structure 41; wherein, the first bandpass filter layer 4 completely covers the red light-emitting region, the green light-emitting region, and the blue light-emitting region.

[0085] The alignment process between the first and second display substrates is as follows: First, under a vacuum or nitrogen atmosphere, a sealing adhesive 13 is applied to the peripheral area of ​​the first and / or second display substrates, and a first transparent resin material is applied to the central area. Then, the two substrates are brought close together for high-precision alignment and alignment. Next, the sealing adhesive 13 is cured using an ultraviolet curing process, and the first transparent resin material is thermally cured using a low-temperature (≤100℃) curing process. The sealing adhesive 13 has a thickness of 15µm to 50µm, preferably 20µm to 40µm, and more preferably 20µm to 30µm. The sealing adhesive 13 contains fiber or microsphere fillers with controlled particle size and thickness. The first transparent resin material is preferably a low-temperature curing resin (main curing temperature ≤100℃, preferably ≤90℃), and after curing, its outgassing value after baking at 100℃ for 2 hours is ≤100ppm. After curing, the first transparent resin material forms a first transparent resin layer 8, the thickness of which ranges from 5µm to 30µm, preferably from 10µm to 15µm. Furthermore, to avoid total internal reflection of some light at the interface between adjacent film layers, the refractive index of the first transparent resin layer 8 is preferably less than or equal to the refractive index of the film layer in the first light-concentrating structure 41 that is in contact with the first transparent resin layer 8, and the refractive index of the first transparent resin layer is greater than or equal to the refractive index of the film layer in the first encapsulation layer 7 that is in contact with the first transparent resin layer 8. For example, if the refractive index of the film layer in the first light-concentrating structure 41 that is in contact with the first transparent resin layer 8 is n3, and the refractive index of the film layer in the first encapsulation layer 7 that is in contact with the first transparent resin layer 8 is n4, then the refractive index n5 of the first transparent resin layer 8 satisfies: n4≤n5≤n3. Specific values ​​can be set according to actual conditions.

[0086] It should be noted that when the display panel contains a first bandpass filter layer 4 and the first light-concentrating structure 41 in the first bandpass filter layer 4 includes a first collimating lens, the first collimating lens will be embedded in the first transparent resin layer 8.

[0087] Figure 9 This is a schematic diagram of another display panel provided in an embodiment of the present disclosure, as shown below. Figure 9 As shown, with Figure 6 The display panel shown is different from the box-type display panel. Figure 9 The display panel shown is a non-cell display panel; specifically, the light conversion color filter array is directly fabricated on the first display substrate. At this time, the second encapsulation layer 9 is located on the side of the second pixel defining layer 10 away from the first substrate 1, the second bandpass filter layer 5 is located on the side of the second encapsulation layer 9 away from the first substrate 1, and the color resist layer 11 is located on the side of the second bandpass filter layer 5 away from the first substrate 1.

[0088] In practical applications, it has been found that in display panels employing blue light-emitting units 2 + red / green light conversion color filters 3g, the amount of blue light emitted by the display panel is relatively high, which can easily lead to an overall bluish tint in the displayed image. To solve this problem, a circular polarizer 14 and a protective film 15 are also provided on the side of the color resist layer 11 away from the first substrate 1. The protective film 15 is located on the side of the circular polarizer 14 away from the first substrate 1. The circular polarizer 14 is a reflective circular polarizer 14, preferably a reflective circular polarizer 14 with slightly higher reflectivity in the blue light band, in order to reduce the blue light component in the emitted light. The protective film 15 is a coating material with high transmittance and scratch resistance, in order to protect the circular polarizer 14.

[0089] Figures 10a to 10g This is a schematic diagram of the structure in which other functional films are fabricated directly on the first display substrate in an embodiment of this disclosure, such as... Figures 10a to 10g As shown, in this embodiment of the present disclosure, the process of directly fabricating other functional film layers on the first display substrate is as follows: First, a first display substrate is provided; the specific fabrication process can be found in the preceding content and will not be repeated here. Then, see... Figure 10aAs shown, a first transparent resin layer 8 is fabricated on the first display substrate. To avoid total internal reflection of some light at the interface between adjacent film layers, preferably, the refractive index of the first transparent resin layer 8 is less than or equal to the refractive index of the film layer in the subsequently fabricated first light-concentrating structure 41 that is in contact with the first transparent resin layer 8, and the refractive index of the first transparent resin layer is greater than or equal to the refractive index of the film layer in the first encapsulation layer 7 that is in contact with the first transparent resin layer 8. When the first light-concentrating structure 41 in the subsequently fabricated first bandpass filter layer 4 includes a first collimating lens structure, a receiving groove for accommodating the first collimating lens needs to be fabricated on the side of the first transparent resin layer 8 facing away from the substrate through an exposure (e.g., halftone mask exposure) and development process. For example, if the first collimating lens is a plano-convex lens, the receiving groove has a convex bottom. When the first light-concentrating structure 41 in the subsequently fabricated first bandpass filter layer 4 is a multilayer first light-concentrating thin film stacked structure, the aforementioned receiving groove is not required. Next, referring to Figure 10b, the first bandpass filter layer 4 is prepared; specifically, the first focusing structure 41 is prepared first, and then the first bandpass filter structure 42 is prepared; in this embodiment of the present disclosure, multiple first collimating lenses (e.g., plano-convex lenses) can be prepared by exposure and development to obtain the first focusing structure 41, at which time the first collimating lenses are located in the receiving groove of the first transparent resin layer 8; or the first focusing structure 41 can be obtained by preparing multiple first focusing films stacked together, and in the direction away from the first substrate 1, the refractive index of each first focusing film increases sequentially; plasma enhancement can be used to enhance the light. A first bandpass filter structure 42 is formed by alternating deposition of nanoscale high-refractive-index resin material and nanoscale low-refractive-index resin material using chemical vapor deposition. The first bandpass filter structure 42 can also be located within a receiving groove (in which case the maximum thickness of the first transparent resin layer 8 is greater than or equal to the maximum thickness of the first bandpass filter structure 42). In some embodiments, the surface of the first bandpass filter structure 42 away from the first substrate 1 is flush with the surface of the first transparent resin layer 8 away from the first substrate 1 to facilitate the subsequent fabrication of film layers. The first bandpass filter layer 4 completely covers the red light emitting region, the green light emitting region, and the blue light emitting region. Next, see... Figure 10c As shown, the second pixel defining layer 10 is fabricated. The specific fabrication process can be found in the previous content and will not be repeated here. Next, see... Figure 10d As shown, a red light conversion color film 3r and a green light conversion color film 3g are respectively prepared in the second receiving hole corresponding to the red light emitting region and the second receiving hole corresponding to the green light emitting region, and a transparent resin pattern 30b is prepared in the second receiving hole corresponding to the blue light emitting region. Next, see... Figure 10e As shown, a second encapsulation layer 9 is prepared; the refractive index of the second encapsulation layer 9 is in the range of 1.7 to 2.0, preferably between 1.75 and 1.85; the thickness of the second encapsulation layer 9 is less than 1 μm, preferably less than 0.5 μm. Next, see... Figure 10f As shown in Figure 10g, a first bandpass filter layer 4 is fabricated. Specifically, a second focusing structure 51 is fabricated first, followed by a second bandpass filter structure 52. The fabrication processes for the second focusing structure 51 and the second bandpass filter structure 52 are the same as those for the first focusing structure 41 and the first bandpass filter structure 42. Specific fabrication processes can be found in the preceding content and will not be repeated here. The second bandpass filter layer 5 completely covers the red and green light emission regions, but does not cover the blue light emission region. Next, referring to Figure 10g, a color resist layer 11, a circular polarizer 14, and a protective film 15 are fabricated sequentially.

[0090] Based on the same inventive concept, this disclosure also provides a display device, which is a quantum dot display device. The display device includes the display panel provided in any of the preceding embodiments. For a description of the display panel, please refer to the content of the preceding embodiments, which will not be repeated here.

[0091] Based on the same inventive concept, this disclosure also provides a method for preparing a display panel, which can be used to prepare the display panel provided in the preceding embodiments.

[0092] Figure 11 A flowchart illustrating a method for manufacturing a display panel according to an embodiment of this disclosure is shown below. Figure 11 As shown, the preparation method includes:

[0093] Step S101: Prepare the first display substrate.

[0094] Step S101 includes step S1011.

[0095] Step S1011: Form an array of light-emitting units on the first substrate.

[0096] The light-emitting unit array includes multiple light-emitting units, which are used to generate and emit light of a first color.

[0097] Step S102: Prepare the second display substrate.

[0098] Step S102 includes step S1021.

[0099] Step S1021: Form a light conversion color filter array on the second substrate.

[0100] The light conversion color filter array includes multiple light conversion color filters, one light conversion color filter corresponds to one light-emitting unit, and different light conversion color filters correspond to different light-emitting units. The light conversion color filters are used to generate other colors of light under the excitation of the first color light.

[0101] In some embodiments, step S1022 is further included within step S102 and after step S1021.

[0102] Step S1022: Form a first bandpass filter layer on the side of the light conversion color filter array away from the second substrate.

[0103] The first bandpass filter layer includes a first bandpass filter structure and a first light-concentrating structure located on the side of the first bandpass filter structure away from the second substrate. The first light-concentrating structure is configured to concentrate light, and the first bandpass filter structure is configured to transmit a first color light and reflect other colors of light.

[0104] In some embodiments, step S102 includes step S1020 within step S102 and before step S1021.

[0105] Step S1020: A second bandpass filter layer is formed on the second substrate and on one side of the subsequent fabrication of the light conversion color filter array.

[0106] The second bandpass filter layer includes a second bandpass filter structure and a second light-concentrating structure located on the side of the second bandpass filter structure away from the second substrate. The second light-concentrating structure is configured to concentrate light, and the second bandpass filter structure is configured to transmit other colors of light and reflect the first color of light.

[0107] The technical solution disclosed herein does not limit the order of steps S101 and S102, that is, step S102 may be executed before step S101, after step S101, or simultaneously with step S101.

[0108] Step S103: Fix the first display substrate and the second display substrate together.

[0109] The light-emitting unit array and the light-converting color filter array are located between the first substrate and the second substrate.

[0110] In this embodiment, step S102 may include at least one of steps S1020 and S1021. The illustrations showing step S102 including steps S1020 to S2022 are merely illustrative and do not limit the technical solution of this disclosure. For a detailed description of each step, please refer to the corresponding content in the preceding embodiments; further details will not be repeated here.

[0111] Figure 12 A flowchart illustrating another method for manufacturing a display panel provided in this disclosure embodiment is shown below. Figure 12 As shown, the preparation method includes:

[0112] Step S201: Form an array of light-emitting units on the first substrate.

[0113] The light-emitting unit array includes multiple light-emitting units, which are used to generate and emit light of a first color.

[0114] Step S203: Form a light conversion color filter array on the side of the light-emitting unit array away from the first substrate.

[0115] The light conversion color filter array includes multiple light conversion color filters, one light conversion color filter corresponds to one light-emitting unit, and different light conversion color filters correspond to different light-emitting units. The light conversion color filters are used to generate other colors of light under the excitation of the first color light.

[0116] In some embodiments, step S202 is further included between step S201 and step S203.

[0117] Step S202: A first bandpass filter layer is formed on the side of the light-emitting unit array away from the first substrate.

[0118] The first bandpass filter layer includes: a first light-concentrating structure and a first bandpass filter structure located on the side of the first light-concentrating structure away from the first substrate. The first light-concentrating structure is configured to concentrate light, and the first bandpass filter structure is configured to transmit a first color light and reflect other colors of light.

[0119] In some embodiments, step S204 is further included after step S203.

[0120] Step S204: Form a second bandpass filter layer on the side of the light conversion color filter array away from the first substrate.

[0121] The second bandpass filter layer includes a second light-concentrating structure and a second bandpass filter structure located on the side of the second light-concentrating structure away from the first substrate. The second light-concentrating structure is configured to concentrate light, and the second bandpass filter structure is configured to transmit other colors of light and reflect the first color of light.

[0122] In this embodiment of the disclosure, the preparation method may include at least one of the above steps S202 and S204. The accompanying drawings may include cases where steps S202 to S204 are shown simultaneously, but this is merely illustrative and does not limit the technical solution of this disclosure. For a detailed description of each step, please refer to the corresponding content in the preceding embodiments; it will not be repeated here.

[0123] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A display panel, comprising: First substrate, light-emitting unit array, and second pixel defining layer; The light-emitting unit array is located on one side of the first substrate and includes multiple light-emitting units; the second pixel defining layer is located on the side of the light-emitting unit array away from the first substrate; the second pixel defining layer is provided with multiple second receiving holes; The display panel further includes a light-converting color filter array, which comprises multiple light-converting color filters. One light-converting color filter is disposed in a second receiving aperture. Each light-converting color filter corresponds to one light-emitting unit, and different light-converting color filters correspond to different light-emitting units. The orthographic projection of the light-converting color filter on the first substrate covers the orthographic projection of the corresponding light-emitting unit on the first substrate. The width of the second receiving aperture is greater than the width of the light-emitting unit. The light-emitting unit generates and emits a first color light, and the light-converting color filter generates other colors of light under the excitation of the first color light. The other colors of light include a second color light and a third color light. The first color light is blue light, the second color light is red light, and the third color light is green light. The light-converting color filter is fabricated using an inkjet printing process. The display panel is divided into multiple light-emitting areas, and the second receiving hole corresponds to each of the light-emitting areas. The multiple light-emitting areas include a blue light-emitting area, a red light-emitting area, and a green light-emitting area. The blue light-emitting area emits blue light, the red light-emitting area emits red light, and the green light-emitting area emits green light. The size of the second receiving hole corresponding to the green light-emitting area is larger than the size of the second receiving hole corresponding to the red light-emitting area, and the size of the second receiving hole corresponding to the red light-emitting area is larger than the size of the second receiving hole corresponding to the blue light-emitting area. The display panel also includes an isolation dam, which is disposed on the side of the second pixel defining layer surrounding the second receiving hole corresponding to the red light-emitting area and the green light-emitting area, away from the first substrate. The display panel is characterized in that it further includes: A first bandpass filter layer, located between the light-emitting unit array and the light-converting color filter array, includes: a first light-gathering structure and a first bandpass filter structure located on the side of the first light-gathering structure away from the first substrate. The first light-gathering structure is configured to focus light, and the first bandpass filter structure is configured to transmit a first color light and reflect other colors of light. The first light-gathering structure includes a first transparent resin layer located between the light-emitting unit array and the light-converting color filter array, and a plurality of first collimating lenses embedded in the first transparent resin layer and corresponding one-to-one with the light-emitting units. One of the two surfaces of the first collimating lens along its thickness direction is closer to the surface of the first substrate, and further away from the first substrate than the two surfaces of the first transparent resin layer along its thickness direction. And / or, The second bandpass filter layer, located on the side of the light conversion color filter array away from the light-emitting unit array, includes: a second light-gathering structure and a second bandpass filter structure located on the side of the second light-gathering structure away from the first substrate. The second light-gathering structure is configured to focus light, and the second bandpass filter structure is configured to transmit other colors of light and reflect the first color of light. The second light-gathering structure includes a second transparent resin layer located on the side of the light conversion color filter away from the light-emitting unit array, and a plurality of second collimating lenses embedded in the second transparent resin layer and corresponding one-to-one with the light conversion color filter. The display panel also includes: The first encapsulation layer is located between the light-emitting unit array and the first light-concentrating structure; the refractive index of the film layer in the first light-concentrating structure that is in contact with the first transparent resin layer is n3, the refractive index of the film layer in the first encapsulation layer that is in contact with the first transparent resin layer is n4, and the refractive index of the first transparent resin layer is n5, wherein the above refractive indices satisfy: n4≤n5≤n3. The second encapsulation layer is located on the side of the second pixel defining layer that is close to the first substrate; the refractive index of the second encapsulation layer is 1.7-2.0 and the thickness is less than 1 μm.

2. The display panel according to claim 1, characterized in that, The first light-concentrating structure includes at least two layers of first light-concentrating films stacked together, wherein the refractive index of the first light-concentrating film closer to the first substrate is less than the refractive index of the first light-concentrating film farther from the first substrate.

3. The display panel according to claim 1, characterized in that, The second light-concentrating structure includes at least two layers of second light-concentrating films stacked together, wherein the refractive index of the second light-concentrating film closer to the first substrate is less than the refractive index of the second light-concentrating film farther from the first substrate.

4. The display panel according to claim 1, characterized in that, The first bandpass filter structure is a distributed Bragg reflection structure; And / or, the second bandpass filter structure is a distributed Bragg reflection structure.

5. The display panel according to claim 1, characterized in that, The material of the light conversion color filter includes quantum dot materials.

6. The display panel according to any one of claims 1-5, characterized in that, The light conversion color filter array includes: a first light conversion color filter that emits a second color light and a second light conversion color filter that emits a third color light.

7. The display panel according to claim 6, characterized in that, The first bandpass filter structure is configured to have a transmittance of more than 90% for light in the 400nm to 550nm band and to perform total internal reflection for light in the 550nm to 780nm band.

8. The display panel according to claim 6, characterized in that, The second bandpass filter structure is configured to have a transmittance of more than 90% for light in the 480nm to 800nm ​​band and to perform total internal reflection for light in the 380nm to 480nm band.

9. The display panel according to claim 6, characterized in that, The display panel further includes: a first pixel defining layer located on the side of the first substrate near the light-emitting unit array, and the first bandpass filter layer located between the first encapsulation layer and the light conversion color filter array; The first pixel defining layer is provided with a plurality of first receiving holes, each of which corresponds to a light-emitting area, and the light-emitting unit is located in the corresponding first receiving hole.

10. The display panel according to claim 6, The orthographic projection of the second bandpass filter layer onto the first substrate covers the red light emitting region and the green light emitting region but does not cover the blue light emitting region. The second receiving hole corresponds one-to-one with the light-emitting area. The first light conversion color film and the second light conversion color film are both located in the corresponding second receiving hole. A transparent resin pattern is provided in the second receiving hole corresponding to the blue light emitting area.

11. The display panel according to claim 10, characterized in that, The display panel further includes: a color resist layer located on the side of the second pixel defining layer away from the first substrate, a second substrate located on the side of the color resist layer away from the first substrate, a sealing adhesive located between the first substrate and the second substrate and in the peripheral area, and a second bandpass filter layer located between the color resist layer and the second pixel defining layer. The color resist layer includes a black matrix and multiple color resists, the multiple color resists including a first color resist, a second color resist and a third color resist, the first color resist corresponds one-to-one with the blue light emitting area, the second color resist corresponds one-to-one with the red light emitting area, and the third color resist corresponds one-to-one with the green light emitting area.

12. The display panel according to claim 10, characterized in that, The display panel further includes: a second encapsulation layer located on the side of the second pixel defining layer away from the first substrate, a color resist layer located on the side of the second encapsulation layer away from the first substrate, a circular polarizer located on the side of the color resist layer away from the first substrate, and a protective film located on the side of the circular polarizer away from the first substrate. The color resist layer includes a black matrix and multiple color resists, the multiple color resists including a first color resist, a second color resist and a third color resist, the first color resist corresponds one-to-one with the blue light emitting area, the second color resist corresponds one-to-one with the red light emitting area, and the third color resist corresponds one-to-one with the green light emitting area.

13. A display device, characterized in that, include: The display panel as described in any one of claims 1-12 above.

14. A method for manufacturing a display panel as described in any one of claims 1-12, comprising: Fabricating a first display substrate includes: forming a light-emitting unit array on a first substrate, the light-emitting unit array including a plurality of light-emitting units, the light-emitting units being used to generate and emit a first color light; Fabricating a second display substrate includes: forming a light-converting color filter array on a second substrate, the light-converting color filter array including a plurality of light-converting color filters, one light-converting color filter corresponding to one light-emitting unit and different light-converting color filters corresponding to different light-emitting units, the light-converting color filters being used to generate other colors of light under the excitation of the first color light; The first display substrate and the second display substrate are assembled and fixed together, and the light-emitting unit array and the light-converting color filter array are located between the first substrate and the second substrate. The feature is that, during the fabrication of the second display substrate and after the step of forming the light conversion color filter array, the method further includes: forming a first bandpass filter layer on the side of the light conversion color filter array away from the second substrate, the first bandpass filter layer comprising: a first bandpass filter structure and a first light-concentrating structure located on the side of the first bandpass filter structure away from the second substrate, the first light-concentrating structure being configured to concentrate light, and the first bandpass filter structure being configured to transmit a first color light and reflect other color light; And / or, during the fabrication of the second display substrate and before the step of forming the light conversion color filter array, the method further includes: forming a second bandpass filter layer on the second substrate and on one side of the subsequent fabrication of the light conversion color filter array, the second bandpass filter layer comprising: a second bandpass filter structure and a second light-concentrating structure located on the side of the second bandpass filter structure away from the second substrate, the second light-concentrating structure being configured to concentrate light, and the second bandpass filter structure being configured to transmit the other color light and reflect the first color light.

15. A method for manufacturing a display panel as described in any one of claims 1-12, comprising: An array of light-emitting units is formed on a first substrate, the array of light-emitting units comprising a plurality of light-emitting units, the light-emitting units being used to generate and emit light of a first color; A light-converting color filter array is formed on the side of the light-emitting unit array away from the first substrate. The light-converting color filter array includes multiple light-converting color filters. One light-converting color filter corresponds to one light-emitting unit, and different light-converting color filters correspond to different light-emitting units. The light-converting color filters are used to generate other colors of light when excited by the first color light. The feature is that, between the step of forming the light-emitting unit array and the step of forming the light-converting color filter array, it further includes: forming a first bandpass filter layer on the side of the light-emitting unit array away from the first substrate, the first bandpass filter layer including: a first light-concentrating structure and a first bandpass filter structure located on the side of the first light-concentrating structure away from the first substrate, the first light-concentrating structure being configured to concentrate light, and the first bandpass filter structure being configured to transmit a first color light and reflect other color light; And / or, after the step of forming the light conversion color filter array, the method further includes: forming a second bandpass filter layer on the side of the light conversion color filter array away from the first substrate, the second bandpass filter layer including: a second light-concentrating structure and a second bandpass filter structure located on the side of the second light-concentrating structure away from the first substrate, the second light-concentrating structure being configured to concentrate light, and the second bandpass filter structure being configured to transmit the other color light and reflect the first color light.

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