Light-emitting device, preparation method thereof and display panel

Abstract

The invention discloses a light-emitting device, a preparation method thereof and a display panel, and relates to the technical field of display. The light-emitting device comprises a retaining wall structure forming an accommodating space, a light-emitting unit located in the accommodating space, a first conversion part for performing first conversion on light rays emitted by the light-emitting unit, and a second conversion part for performing second conversion on the light rays emitted by the light-emitting unit. Through the design of the first conversion part and the second conversion part, light emitted by the light-emitting unit can be converted twice, the problem of incomplete conversion after one-time conversion can be avoided, the color mixing phenomenon of multiple light-emitting devices included in the display panel can be avoided, the phenomenon that light colors of the light-emitting devices do not exist is avoided, and the display quality is improved. The yield of the display panel can be improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a light-emitting device and its preparation method, and a display panel. Background Technology

[0002] The display panel includes multiple light-emitting devices, each of which comprises a light-emitting unit and a color conversion layer. The light emitted by the light-emitting unit is emitted after color conversion by the color conversion layer.

[0003] In related technologies, the conversion efficiency of the color transfer layer when converting the light emitted by the light-emitting unit is low, and the conversion is usually incomplete. Therefore, it is easy to cause color mixing in the multiple light-emitting devices included in the display panel, or to cause the light color of the light-emitting device to be lost, resulting in a low yield of the display panel. Summary of the Invention

[0004] This application provides a light-emitting device and its fabrication method, as well as a display panel, which can solve the problem of low yield of display panels in related technologies. The technical solution is as follows:

[0005] On one hand, a light-emitting device is provided, the light-emitting device comprising:

[0006] A retaining wall structure located on the drive backplate, the retaining wall structure forming an accommodating space;

[0007] A light-emitting unit located on the drive backplate and within the receiving space, the light-emitting unit being used to emit light;

[0008] A first conversion section is located on the side of the light-emitting unit away from the driving back plate. The first conversion section is used to perform a first conversion on the light emitted by the light-emitting unit.

[0009] And a second conversion unit located on the side of the first conversion unit away from the drive back plate, the second conversion unit being used to perform a second conversion on the light emitted by the light-emitting unit.

[0010] Optionally, the light-emitting device further includes an encapsulation layer located between the first conversion part and the second conversion part, the encapsulation layer being used to encapsulate the first conversion part.

[0011] Optionally, the encapsulation layer is also used to scatter the light passing through the first conversion unit;

[0012] Optionally, the encapsulation layer includes a host material and scattering particles, wherein the host material is at least one of methyl acrylate, ethyl acrylate, methyl 2-methacrylate, and ethyl 2-methacrylate, and the scattering particles are at least one of titanium dioxide and zinc oxide.

[0013] Optionally, the material of the first conversion section includes at least perovskite quantum dots, and the material of the second conversion section includes at least indium phosphide or cadmium selenide quantum dots.

[0014] Optionally, the first conversion unit is used to convert the light emitted by the light-emitting unit into light of a first wavelength, and the second conversion unit is used to convert the light of the first wavelength into light of a second wavelength;

[0015] Wherein, the first wavelength is less than or equal to the second wavelength.

[0016] Optionally, the light-emitting device is a red light-emitting device;

[0017] The light-emitting unit is a blue light chip, the first wavelength of light is red or green light, and the second wavelength of light is red light; or, the light-emitting unit is a violet light chip, the first wavelength of light is blue light, and the second wavelength of light is red light.

[0018] Optionally, the light-emitting device is a green light-emitting device;

[0019] The light-emitting unit is a blue light chip, the first wavelength of light is green light, and the second wavelength of light is green light; or, the light-emitting unit is a violet light chip, the first wavelength of light is blue light, and the second wavelength of light is green light.

[0020] Optionally, the orthographic projection of the second conversion unit on the drive back plate covers the orthographic projection of the light-emitting unit on the drive back plate, and also covers the orthographic projection of the first conversion unit on the drive back plate.

[0021] The surface of the second conversion part away from the drive back plate is convex towards the side away from the drive back plate, or the surface of the second conversion part away from the drive back plate is concave towards the side close to the drive back plate.

[0022] Optionally, the light-emitting device includes: a first target layer and a second target layer located on the side of the second conversion section away from the driving backplate;

[0023] The refractive index of the first target layer is different from that of the second target layer.

[0024] Optionally, the first target layer includes a first lens, the orthographic projection of the first lens onto the driving backplate covers the orthographic projection of the light-emitting unit onto the driving backplate, and the surface of the first lens away from the driving backplate is convex to the side away from the driving backplate.

[0025] Optionally, the light-emitting device further includes: a second lens located on the side of the second conversion section near the driving back plate; the barrier structure includes: a plurality of barrier portions stacked sequentially in a direction away from the driving back plate; the barrier structure includes a plurality of sub-accommodating spaces formed by the plurality of barrier portions;

[0026] The light-emitting unit, the first conversion part, the second conversion part, and the second lens are located at least within the plurality of sub-accommodating spaces.

[0027] Optionally, the plurality of retaining wall portions include: a first retaining wall portion, a second retaining wall portion, and a third retaining wall portion stacked in a direction away from the drive back plate; the plurality of sub-accommodating spaces include a first sub-accommodating space formed by the first retaining wall portion, a second sub-accommodating space formed by the second retaining wall portion, and a third sub-accommodating space formed by the third retaining wall portion.

[0028] The cross-sectional area of ​​the first retaining wall portion in the direction perpendicular to the thickness of the drive back plate decreases as the distance from the drive back plate increases. The encapsulation layer is located within the first sub-accommodating space, and the surface of the encapsulation layer away from the drive back plate is recessed towards the side closer to the drive back plate.

[0029] The cross-sectional area of ​​the second retaining wall portion in the direction perpendicular to the thickness of the drive back plate increases with the increase of the distance from the drive back plate. The second lens is located in the second sub-accommodating space, and the surface of the second lens away from the drive back plate is concave towards the side closer to the drive back plate.

[0030] The cross-sectional area of ​​the third retaining wall portion in the direction perpendicular to the thickness of the drive back plate decreases as the distance from the drive back plate increases. The second conversion portion is located within the third sub-accommodating space, and the surface of the second conversion portion away from the drive back plate protrudes to the side away from the drive back plate.

[0031] Optionally, the light-emitting device further includes a filter section located on the side of the second conversion section away from the driving back plate;

[0032] The color of the light that can be transmitted through the filter section is the same as the color of the light after it has passed through the first conversion section and the second conversion section.

[0033] Optionally, the light-emitting unit includes an anode layer, a light-emitting layer, and a cathode layer stacked in a direction away from the driving backplate, and the first conversion unit and the light-emitting unit are integrated.

[0034] On the other hand, a method for fabricating a light-emitting device is provided, the method comprising:

[0035] A light-emitting unit is formed on the drive backplate, and the light-emitting unit is used to emit light.

[0036] A first conversion section is formed on the side of the light-emitting unit away from the driving back plate. The first conversion section is used to perform a first conversion on the light emitted by the light-emitting unit.

[0037] A retaining wall structure is formed around the light-emitting unit so that the light-emitting unit is located within the receiving space formed by the retaining wall structure;

[0038] A second conversion section is formed on the side of the first conversion section away from the drive back plate. The second conversion section is used to perform a second conversion on the light emitted by the light-emitting unit.

[0039] In another aspect, a display panel is provided, the display panel comprising: a driving backplate and a plurality of light-emitting devices as described in any one of claims 1 to 14 arranged in an array on the driving backplate;

[0040] The driving backplate is used to provide driving signals for the plurality of light-emitting devices, and the light-emitting devices are used to emit light under the drive of the driving signals.

[0041] Optionally, the driving backplane includes a substrate and a driving circuit located on the substrate, the driving circuit being connected to a plurality of the light-emitting devices.

[0042] The beneficial effects of the technical solution provided in this application include at least the following:

[0043] This application provides a light-emitting device and its fabrication method, as well as a display panel. The light-emitting device includes a baffle structure constituting a receiving space, a light-emitting unit located within the receiving space, a first conversion part that performs a first conversion on the light emitted by the light-emitting unit, and a second conversion part that performs a second conversion on the light emitted by the light-emitting unit. Through the design of the first and second conversion parts, the light emitted by the light-emitting unit undergoes two conversions, avoiding the problem of incomplete conversion after a single conversion. This prevents color mixing among multiple light-emitting devices in the display panel and avoids the loss of light color in the light-emitting devices, thereby improving the yield of the display panel. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1This is a schematic diagram of the structure of a light-emitting device provided in an embodiment of this application;

[0046] Figure 2 This is a schematic diagram of another light-emitting device provided in an embodiment of this application;

[0047] Figure 3 This is a schematic diagram of color conversion of a red light-emitting device provided in an embodiment of this application;

[0048] Figure 4 This is a schematic diagram of color conversion for another red light-emitting device provided in an embodiment of this application;

[0049] Figure 5 This is a color conversion schematic diagram of another red light-emitting device provided in the embodiments of this application;

[0050] Figure 6 This is a schematic diagram illustrating the color conversion of a green light-emitting device provided in an embodiment of this application;

[0051] Figure 7 This is a schematic diagram of color conversion for another green light-emitting device provided in an embodiment of this application;

[0052] Figure 8 This is a schematic diagram of the structure of another light-emitting device provided in the embodiments of this application;

[0053] Figure 9 This is a schematic diagram of another light-emitting device provided in the embodiments of this application;

[0054] Figure 10 This application provides a schematic diagram of the structure of another light-emitting device.

[0055] Figure 11 This is a schematic diagram of another light-emitting device provided in the embodiments of this application;

[0056] Figure 12 This is a schematic diagram of forming an arc-shaped concave surface provided in an embodiment of this application;

[0057] Figure 13 This is a schematic diagram of forming an arc-shaped raised surface provided in an embodiment of this application;

[0058] Figure 14 This is a schematic diagram of another light-emitting device provided in the embodiments of this application;

[0059] Figure 15 This is a schematic diagram of another light-emitting device provided in the embodiments of this application;

[0060] Figure 16 This is a flowchart illustrating a method for fabricating a light-emitting device according to an embodiment of this application;

[0061] Figure 17 This is a schematic diagram of forming a light-emitting unit provided in an embodiment of this application;

[0062] Figure 18 This is a schematic diagram of a first conversion unit provided in an embodiment of this application;

[0063] Figure 19 This is a schematic diagram of a retaining wall structure provided in an embodiment of this application;

[0064] Figure 20 This is a schematic diagram of a second conversion unit provided in an embodiment of this application;

[0065] Figure 21 This is a schematic diagram of forming a second target layer provided in an embodiment of this application;

[0066] Figure 22 This is a schematic diagram of a filter section provided in an embodiment of this application;

[0067] Figure 23 This is a schematic diagram of the structure of a display panel provided in an embodiment of this application;

[0068] Figure 24 This is a schematic diagram of another display panel structure provided in an embodiment of this application;

[0069] Figure 25 This is a schematic diagram of the structure of another display panel provided in the embodiments of this application;

[0070] Figure 26 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0072] In related technologies, although organic light-emitting diodes (OLEDs) and quantum dot light-emitting diodes (QLEDs) can produce violet light emission, most fabricated violet LED chips exhibit a relatively broad electroluminescence peak due to material limitations. To reduce the emission linewidth and improve color purity of violet LED chips, light filters are typically incorporated into the light-emitting device. However, this method results in wasted light from the light-emitting unit and a decrease in the device's display performance.

[0073] Therefore, quantum dot materials can be used to convert the light emitted by the light-emitting chip, avoiding light waste and ensuring display quality. As a novel quantum dot material, lead halide perovskite quantum dots possess excellent luminescent properties, such as high fluorescence quantum yield and narrow half-width at half-maximum, making them highly promising for applications ranging from solid-state lighting to full-color displays.

[0074] Currently, the external quantum efficiency (EQE) of red and green light-emitting devices has exceeded 20%, demonstrating significant commercial application value. However, blue-violet perovskite quantum dots suffer from lower fluorescence intensity due to their wider band gap, more surface defects, and the susceptibility of their octahedral structure to distortion caused by external environmental influences. Compared to the approximately 90% fluorescence quantum yield of red and green perovskite quantum dots, violet perovskite quantum dots exhibit lower fluorescence quantum yield, weaker luminous intensity, and greater synthesis difficulty. Consequently, the EQE of blue-violet QLED chips remains around 0.1%, limiting the full-color application of perovskite quantum dots in the display field.

[0075] In other words, the light conversion efficiency of existing light-emitting devices is low, and the light is not completely converted. This can easily lead to color mixing among the multiple light-emitting devices in the display panel, or cause the light color of the light-emitting devices to be lost, resulting in a low yield of the display panel.

[0076] Figure 1 This is a schematic diagram of the structure of a light-emitting device provided in an embodiment of this application. (Reference) Figure 1 The light-emitting device 100 includes: a barrier structure 101, a light-emitting unit 102, a first conversion part 103, and a second conversion part 104. The barrier structure 101, the light-emitting unit 102, the first conversion part 103, and the second conversion part 104 are all located on the drive back plate 200.

[0077] The retaining wall structure 101 can form a receiving space N, and the light-emitting unit 102 can be located in the receiving space N, and the light-emitting unit 102 is used to emit light.

[0078] The first conversion unit 103 is located on the side of the light-emitting unit 102 away from the driving backplate 200, and is used to perform a first conversion on the light emitted by the light-emitting unit 102. The second conversion unit 104 is located on the side of the first conversion unit 103 away from the driving backplate 200, and is used to perform a second conversion on the light emitted by the light-emitting unit 102.

[0079] That is, the light emitted by the light-emitting unit 102 can be converted twice, sequentially by the first conversion unit 103 and the second conversion unit 104. This avoids the problem of incomplete conversion after one conversion, thereby avoiding color mixing among the multiple light-emitting devices 100 included in the display panel 01, and preventing the light color of the light-emitting devices 100 from being lost, thus improving the yield of the display panel 01.

[0080] Optionally, the color of the light emitted by the light-emitting unit 102 after the first conversion by the first conversion unit 103 can be the same as or different from the color of the light emitted by the light-emitting unit 102 after the second conversion by the second conversion unit 104. This embodiment does not limit this. The color of the light after the second conversion can be the emission color of the light-emitting device.

[0081] In summary, the embodiments of this application provide a light-emitting device, which includes a baffle structure constituting a receiving space, a light-emitting unit located within the receiving space, a first conversion part that performs a first conversion on the light emitted by the light-emitting unit, and a second conversion part that performs a second conversion on the light emitted by the light-emitting unit. Through the design of the first and second conversion parts, the light emitted by the light-emitting unit undergoes two conversions, avoiding the problem of incomplete conversion after a single conversion. This prevents color mixing among multiple light-emitting devices in the display panel and avoids the loss of light color in the light-emitting devices, thereby improving the yield of the display panel.

[0082] In this embodiment, the orthographic projection of the first conversion unit 103 on the drive back plate 200 covers the orthographic projection of the light-emitting unit 102 on the drive back plate 200. This ensures that all light emitted by the light-emitting unit 102 can be converted by the first conversion unit 103.

[0083] Optionally, the first conversion part 103 can be frustum-shaped. (See reference...) Figure 1 The orthographic projection of the first conversion unit 103 onto the reference plane is trapezoidal. The reference plane is perpendicular to the surface of the drive backplate 200. Of course, the shape of the first conversion unit 103 can also be other shapes, such as a cylinder. The orthographic projection of a cylinder onto the reference plane is rectangular.

[0084] In this embodiment, the first conversion section 103 can be formed after the light-emitting unit is transferred to the driving backplate. The first conversion section 103 can be fabricated using a nanoimprinting process. Alternatively, the first conversion section 103 can be fabricated using a vapor deposition process. Or, the first conversion section 103 can be fabricated using a printing process.

[0085] like Figure 1As shown, the advantage of the trapezoidal orthographic projection of the first conversion section 103 on the reference plane is that it facilitates the subsequent formation of other film layers (such as the encapsulation layer 105 and the second lens T2 in subsequent embodiments) on the surface of the first conversion section 103 away from the drive backplate 200. Furthermore, the trapezoidal orthographic projection of the first conversion section 103 on the reference plane allows for a greater gap between the first conversion section 103 and the barrier structure 101 during the subsequent formation of the barrier structure 101, thus preventing the presence of the first conversion section 103 from affecting the manufacturing process of the barrier structure 101.

[0086] Furthermore, the orthographic projection of the second conversion unit 104 on the drive backplate 200 covers the orthographic projection of the light-emitting unit 102 on the drive backplate 200. This ensures that all light emitted by the light-emitting unit 102 can be converted by the second conversion unit 104. Also, the orthographic projection of the second conversion unit 104 on the drive backplate 200 covers the orthographic projection of the first conversion unit 103 on the drive backplate 200. This ensures that all light that has undergone the first conversion by the first conversion unit 103 can undergo the second conversion by the second conversion unit 104.

[0087] Optional, see reference Figure 1 The surface of the second conversion section 104 away from the drive backplate 200 is convex towards the side away from the drive backplate 200, such as an arc-shaped convex surface. Alternatively, refer to... Figure 2 The surface of the second conversion part 104 away from the drive back plate 200 is concave to the side away from the drive back plate 200, such as the surface of the second conversion part 104 away from the drive back plate 200 being an arc-shaped concave surface.

[0088] refer to Figure 1 and Figure 2 The light-emitting device 100 further includes an encapsulation layer 105. The encapsulation layer 105 is located between the first conversion section 103 and the second conversion section 104. The encapsulation layer 105 is used to encapsulate the first conversion section 103.

[0089] Optionally, the encapsulation layer 105 may include a host material, which is at least one of methyl acrylate, ethyl acrylate, methyl 2-methacrylate, and ethyl 2-methacrylate.

[0090] Alternatively, the encapsulation layer 105 can also scatter the light after it has passed through the first conversion unit 103. This allows more light to be converted by the second conversion unit 104, ensuring that the light emitted by the light-emitting unit 102 undergoes two conversions, thereby improving the efficiency of light conversion.

[0091] Optionally, the encapsulation layer 105 includes a host material and scattering particles. The host material can be an acrylate (the refractive index of the acrylate can be in the range of 1.359 to 2), for example, at least one of methyl acrylate, ethyl acrylate, methyl 2-methacrylate, and ethyl 2-methacrylate. The scattering particles can be at least one of titanium dioxide (TiO2) and zinc oxide (ZnO).

[0092] Optionally, the scattering particles can be titanium dioxide. That is, the encapsulation layer 105 can be a mixture of acrylate and titanium dioxide, and can be called a titanium dioxide acrylate encapsulation layer. For example, the main material is methyl acrylate, and the scattering particles are titanium dioxide. That is, the encapsulation layer 105 can be a mixture of methyl acrylate and titanium dioxide, and can be called a titanium dioxide methyl acrylate encapsulation layer.

[0093] Alternatively, the scattering particles can be zinc oxide. That is, the encapsulation layer 105 can be a mixture of acrylate and zinc oxide, which can be called a zinc oxide acrylate encapsulation layer.

[0094] In this embodiment, the material of the first conversion unit 103 includes at least perovskite quantum dots, and the material of the second conversion unit 104 includes at least indium phosphide or cadmium selenide quantum dots. Thus, the first conversion unit 103 can be referred to as a perovskite quantum dot conversion unit, and the second conversion unit 104 can be referred to as an indium phosphide or cadmium selenide quantum dot conversion unit. The first conversion unit 103 can be encapsulated in a glass-like form; that is, the first conversion unit 103 can be glass doped with perovskite quantum dots.

[0095] Optionally, the first conversion section 103 can be crystalline, and the lattice structure itself has a light-diffusing effect. Therefore, it is not necessary to add scattering particles to the first conversion section 103. After passing through the first conversion section 103, the first conversion section 103 can absorb a portion of the light emitted by the light-emitting unit and convert this absorbed light. At the same time, the unconverted light can pass through the encapsulation layer 105 and irradiate the second conversion section 104. The material of the second conversion section 104 may also include titanium dioxide (TiO2) scattering particles and methyl acrylate. That is, the second conversion section 104 can be a mixed quantum dot film layer with high scattering effect. In this case, the light reaching the second conversion section 104 is scattered and converted.

[0096] Optionally, the first conversion unit 103 can be used to convert the light emitted by the light-emitting unit 102 into light of a first wavelength, and the second conversion unit 104 can be used to convert the light of the first wavelength into light of a second wavelength. Wherein, the first wavelength is less than or equal to the second wavelength.

[0097] That is, the light emitted by the light-emitting unit 102 can be converted into light of the first wavelength after passing through the first conversion unit 103, and the light of the first wavelength can be converted into light of the second wavelength after passing through the second conversion unit 104. The two conversion processes conform to the law of converting short-wavelength light to long-wavelength light.

[0098] As an optional implementation, the light-emitting device 100 is a red light-emitting device, meaning that the light emitted by the light-emitting unit 102 can emit red light after two conversions. If the light-emitting unit 102 is a blue light chip, meaning the light emitted by the light-emitting unit 102 is blue, then the first wavelength of light can be red or green, and the second wavelength of light can be red. If the light-emitting unit 102 is a violet light chip, meaning the light emitted by the light-emitting unit 102 is violet, then the first wavelength of light can be blue, and the second wavelength of light can be red. The blue light chip can be a blue micro LED, and the violet light chip can be a violet micro LED.

[0099] refer to Figure 3 When the light-emitting unit 102 is a blue light chip, the first conversion unit 103 can be a red perovskite quantum dot conversion unit, and the second conversion unit 104 can be a red indium phosphide or cadmium selenide quantum dot conversion unit. This design allows the light-emitting device 100 to be a red light-emitting device.

[0100] refer to Figure 4 When the light-emitting unit 102 is a blue light chip, the first conversion unit 103 can be a green perovskite quantum dot conversion unit, and the second conversion unit 104 can be a red indium phosphide or cadmium selenide quantum dot conversion unit. This design allows the light-emitting device 100 to be a red light-emitting device.

[0101] refer to Figure 5 When the light-emitting unit 102 is a violet light chip, the first conversion unit 103 can be a blue perovskite quantum dot conversion unit, and the second conversion unit 104 can be a red indium phosphide or cadmium selenide quantum dot conversion unit. This design allows the light-emitting device 100 to be a red light-emitting device.

[0102] As an alternative implementation, the light-emitting device 100 is a green light-emitting device, meaning that the light emitted by the light-emitting unit 102 can emit green light after two conversions. If the light-emitting unit 102 is a blue light chip, meaning the light emitted by the light-emitting unit 102 is blue, then the first wavelength of light can be green, and the second wavelength of light can also be green. If the light-emitting unit 102 is a violet light chip, meaning the light emitted by the light-emitting unit 102 is violet, then the first wavelength of light can be blue, and the second wavelength of light can also be green. The blue light chip can be a blue micro LED, and the violet light chip can be a violet micro LED.

[0103] refer to Figure 6 When the light-emitting unit 102 is a blue light chip, the first conversion unit 103 can be a green perovskite quantum dot conversion unit, and the second conversion unit 104 can be a green indium phosphide or cadmium selenide quantum dot conversion unit. This design allows the light-emitting device 100 to be a green light-emitting device.

[0104] refer to Figure 7 When the light-emitting unit 102 is a violet light chip, the first conversion unit 103 can be a blue perovskite quantum dot conversion unit, and the second conversion unit 104 can be a green indium phosphide or cadmium selenide quantum dot conversion unit. This design allows the light-emitting device 100 to be a green light-emitting device.

[0105] In this embodiment, the light emitted by the light-emitting unit 102, after being converted by the first conversion unit 103 (perovskite quantum dot conversion unit), can pass through the encapsulation layer 105 (titanium oxide acrylate encapsulation layer 105) and reach the second conversion unit 104. The second conversion unit 104 (indium phosphide or cadmium selenide quantum dot conversion unit) performs a second conversion on the light. This improves the light conversion efficiency, greatly reduces light loss in the optical path, increases product brightness, and facilitates the fabrication of ultra-thin, high color gamut light-emitting devices.

[0106] In this embodiment, regardless of whether the light-emitting unit 102 is a blue light chip or a violet light chip, the light emitted by the light-emitting unit 102 can be converted for the first time by the first conversion unit 103 (perovskite quantum dot conversion unit). After the first conversion, some light may not be converted (the unconverted light is the blue or violet light emitted by the light-emitting unit 102), while some light has been converted. Since the scattering rates of the unconverted light (e.g., blue light) and the converted light (e.g., red light) are different, the converted light will not be absorbed by the second conversion unit 104, but can be directly transmitted. The unconverted light is converted a second time by the second conversion unit 104 after passing through the encapsulation layer 105. This can effectively improve the phenomenon of light leakage from the light-emitting unit 102 in the light-emitting device.

[0107] In the embodiments of this application, reference is made to Figure 1 and Figure 2 The light-emitting device 100 also includes a reflective layer 106 located within the accommodating space N and between the light-emitting unit 102 and the driving backplate 200. The reflective layer 106 can be used to reflect the light emitted by the light-emitting unit 102 to the first conversion unit 103. Optionally, the material of the reflective layer 106 can be a metal, for example, the metal of the reflective layer 106 can be silver (Ag).

[0108] Optionally, the light-emitting device 100 further includes a limiting portion 107 located within the accommodating space N. The limiting portion 107 forms a limiting space 107a, and the light-emitting unit 102 can be located within the limiting space 107a. The limiting portion 107 can be used to limit the placement position of the light-emitting unit 102. Further, the light-emitting device 100 also includes an encapsulation portion 108 and a third lens T3 located within the limiting space 107a and on the side of the light-emitting unit 102 away from the driving backplate 200. Both the encapsulation portion 108 and the third lens T3 are used to encapsulate the light-emitting unit 102.

[0109] The third lens T3 is located between the light-emitting unit 102 and the first conversion part 103. The surface of the third lens T3 away from the driving back plate 200 is convex towards the side away from the driving back plate 200, such as an arc-shaped convex surface. The surface of the third lens T3 near the driving back plate 200 is also convex towards the side near the driving back plate 200, such as an arc-shaped convex surface.

[0110] Optionally, the reflective layer 106, the limiting portion 107, and the encapsulation portion 108 can constitute a reflective cavity for the light emitted by the light-emitting unit 102. The light can be reflected multiple times within the reflective cavity before entering the third lens T3. The light can be focused on the surface of the third lens T3 away from the driving backplate 200. The focused light is then incident on the first conversion portion 103 for color conversion.

[0111] Furthermore, the light-emitting device 100 also includes a second lens T2 located on the side of the second conversion section 104 near the drive back plate 200. The second lens T2 can be used to converge the light after the first conversion by the first conversion section 103, ensuring that the light after the first conversion section 103 can be converted by the second conversion section 104.

[0112] In this embodiment, the light emitted by the light-emitting unit 102 can pass through the reflective layer 106 and the accommodating space N, allowing the light to enter the first conversion unit 103 through the encapsulation part 108 and the third lens T3, whereby the first conversion unit 103 performs a first conversion on the light. Furthermore, the light can pass through the second lens T2 to enter the second conversion unit 104, whereby the second conversion unit 104 performs a second conversion on the light.

[0113] Figure 8 This is a schematic diagram of another light-emitting device provided in an embodiment of this application. (Reference) Figure 8 The light-emitting device 100 includes a first target layer 109 and a second target layer 110 located on the side of the second conversion section 104 away from the driving backplate 200. The refractive index of the first target layer 109 is different from that of the second target layer 110.

[0114] Optionally, the first target layer 109 and the second target layer 110 can serve an encapsulation function, and the first target layer 109 and the second target layer 110 can be collectively referred to as a thin film encapsulation (TFE). The material of the second target layer 110 may include zirconium dioxide.

[0115] Because the refractive index of the first target layer 109 is different from that of the second target layer 110, light can be refracted at the interface between the first target layer 109 and the second target layer 110. This allows for a third conversion of the light (the third conversion does not involve color conversion, but only a change in the direction of the light), which facilitates the convergence of the light and improves the light extraction efficiency.

[0116] In this embodiment, the total thickness of the first conversion part 103 and the second conversion part 104 affects the light conversion efficiency. A thicker total thickness results in higher light conversion efficiency, while a thinner total thickness results in lower light conversion efficiency. To ensure consistent conversion efficiency across different areas within the accommodating space of the retaining wall structure 101, the total thickness of the first conversion part 103 and the second conversion part 104 can be made approximately the same in different areas. (Reference) Figure 8 The thickness h1 of the middle part of the first conversion part 103 is greater than the thickness h2 of the edge part of the first conversion part 103, and the thickness h3 of the middle part of the second conversion part 104 is less than the thickness h4 of the edge part of the second conversion part.

[0117] refer to Figure 8The surface of the second conversion section 104 away from the drive backplate 200 is a concave arc-shaped surface. Therefore, the total thickness of the first conversion section 103 and the second conversion section 104 in the middle is relatively small. Thus, by setting the first target layer 109 and the second target layer 110, the light from the edges can be converged to the middle, compensating for the light in the middle. Furthermore, the convergence of light through the first target layer 109 and the second target layer 110 can reduce light crosstalk (color distortion) caused by light scattering.

[0118] Optionally, the refractive index of the first target layer 109 can be less than the refractive index of the second target layer 110, thus allowing light to travel from a medium with a lower refractive index to a medium with a higher refractive index. Alternatively, the refractive index of the first target layer 109 can be greater than the refractive index of the second target layer 110, thus allowing light to travel from a medium with a higher refractive index to a medium with a lower refractive index.

[0119] For example, the refractive index of the first target layer 109 can be greater than 1.8, and the refractive index of the second target layer 110 can be between 1.2 and 1.4.

[0120] refer to Figure 8 The first target layer 109 includes a first lens T1. The orthographic projection of the first lens T1 onto the driving back plate 200 covers the orthographic projection of the light-emitting unit 102 onto the driving back plate 200. The surface of the first lens T1 away from the driving back plate 200 is convex in some directions away from the driving back plate 200. For example, the surface of the first lens T1 away from the driving back plate 200 is an arc-shaped convex surface.

[0121] For example, each light-emitting device 100 may include a first lens T1. After the light emitted by the light-emitting unit 102 is converted twice by the first conversion part 103 and the second conversion part 104, it can be refracted on the raised surface of the first lens T1 away from the driving back plate 200, thereby converging the light and improving the light extraction efficiency.

[0122] As for the first case, refer to Figure 9 When the surface of the second conversion section 104 away from the drive back plate 200 is convex towards the side away from the drive back plate 200, the second conversion section 104 can serve as the first target layer 109, provided that the refractive index of the second conversion section 104 is less than the refractive index of the second target layer 110. This allows light to be refracted at the interface between the second conversion section 104 and the second target layer 110.

[0123] That is, in this case, the first target layer 109 and the second conversion unit 104 in the light-emitting device 100 can be a single component, and can perform both the second conversion (light conversion) and the third conversion (light refraction) functions.

[0124] Furthermore, in Figure 9 In the scheme shown, the surface of the second conversion part 104 away from the drive back plate 200 is an arc-shaped raised surface. Therefore, the total thickness of the first conversion part 103 and the second conversion part 104 in the middle is relatively large, which can make the conversion efficiency in the middle better.

[0125] As for the second scenario, refer to Figure 8 When the surface of the second conversion section 104 away from the drive backplate 200 is recessed towards the side away from the drive backplate 200, a first target layer 109 can be provided on the side of the second conversion section 104 away from the drive backplate 200. The surface of the first target layer 109 away from the drive backplate 200 is convex towards the side away from the drive backplate 200, and the surface of the first target layer 109 near the drive backplate 200 is convex towards the side near the drive backplate 200. That is, both the surface of the first target layer 109 away from the drive backplate 200 and the surface near the drive backplate 200 are arc-shaped convex surfaces. This allows the second conversion section 104 to perform a second conversion (light conversion), and the interface between the first target layer 109 and the second target layer 110 to perform a third conversion (light refraction).

[0126] In this embodiment, the second target layer 110 can be a fourth lens T4 corresponding to the first lens T1. The orthographic projection of the fourth lens T4 onto the driving backplate 200 overlaps with the orthographic projection of the first lens T1 onto the driving backplate 200. The surface of the fourth lens T4 away from the driving backplate 200 is convex towards the side away from the driving backplate 200. For example, the surface of the fourth lens T4 away from the driving backplate 200 is an arc-shaped convex surface. The arc-shaped convex surface of the fourth lens T4 away from the driving backplate 200 can further converge the light.

[0127] In this case, each light-emitting device 100 may include a fourth lens T4. Since the surface of the fourth lens T4 away from the driving backplate 200 is not a flat surface, the light-emitting device 100 may also include a flattening layer 111 located on the side of the second target layer 110 away from the driving backplate 200. This flattening layer 111 mainly serves a flattening function.

[0128] Or, refer to Figure 10 The second target layer 110 can cover the first lens T1, and the surface of the second target layer 110 away from the driving back plate 200 is a flat surface. That is, the interface between the second target layer 110 and the first lens T1 can not only refract light, but the second target layer 110 can also play a flat role.

[0129] In the embodiments of this application, reference is made to Figure 1 , Figure 2 ,as well as Figures 8 to 10The barrier structure 101 can be a black barrier. The material of the black barrier can include black adhesive-dyed material. The black barrier can be used to absorb light and reduce color crosstalk between adjacent light-emitting devices in the display panel.

[0130] In the embodiments of this application, reference is made to Figures 8 to 10 The accommodating space formed by the barrier structure 101 has a smaller dimension h5 near the driving backplate 200 and a larger dimension h6 in the area away from the driving backplate 200. The reason for this design is that the film layer within the accommodating space can be prepared using a printing process. To reduce the difficulty of the printing process, the printing drop area needs to be larger. However, a larger drop area requires a larger dimension in the accommodating space away from the driving backplate 200. This way, even with a larger printing drop area, the printed material can slide down along the larger opening of the accommodating space, avoiding printing into the accommodating space of adjacent light-emitting units.

[0131] Figure 11 This is a schematic diagram of another light-emitting device provided in an embodiment of this application. (Reference) Figure 11 The retaining wall structure 101 includes a plurality of retaining wall portions stacked sequentially in a direction away from the drive back plate 200. The retaining wall structure 101 includes a plurality of sub-accommodating spaces N formed by the plurality of retaining wall portions, wherein one retaining wall portion forms a corresponding sub-accommodating space N.

[0132] The light-emitting unit 102, the first conversion unit 103, and the second conversion unit 104 are located within at least one of the multiple sub-accommodating spaces N. Furthermore, the first lens T1, the second lens T2, the third lens T3, and the fourth lens T4 may all be located within the multiple sub-accommodating spaces N.

[0133] refer to Figure 11 The plurality of retaining wall portions include a first retaining wall portion 1011, a second retaining wall portion 1012, and a third retaining wall portion 1013 stacked in a direction away from the drive back plate 200. The plurality of sub-accommodating spaces N include a first sub-accommodating space N1 formed by the first retaining wall portion 1011, a second sub-accommodating space N2 formed by the second retaining wall portion 1012, and a third sub-accommodating space N3 formed by the third retaining wall portion 1013.

[0134] The cross-sectional area of ​​the first barrier portion 1011 in the thickness direction perpendicular to the drive back plate 200 decreases as the distance from the drive back plate 200 increases. That is, the cross-section of the first barrier portion 1011 can be an upright trapezoid. The encapsulation layer 105 is located within the first sub-accommodating space N1.

[0135] The cross-sectional area of ​​the second retaining wall portion 1012 in the thickness direction perpendicular to the drive back plate 200 increases with the increase of the distance from the drive back plate 200. That is, the cross-section of the second retaining wall portion 1012 can be an inverted trapezoid. The second lens T2 is located within the second sub-accommodating space N2.

[0136] The cross-sectional area of ​​the third retaining wall portion 1013 in the thickness direction perpendicular to the drive back plate 200 decreases as the distance from the drive back plate 200 increases. That is, the cross-section of the third retaining wall portion 1013 can be an upright trapezoid. The second conversion portion 104 is located within the third sub-accommodating space N3.

[0137] In the direction perpendicular to the bearing surface of the drive backplate 200, the height of the side of the encapsulation layer 105 can be less than or equal to the height of the first baffle portion 1011, so that the encapsulation layer 105 can be located within the first sub-accommodating space N1 formed by the first baffle portion 1011. The height of the side of the second lens T2 (which can also be called a condenser lens) can be less than or equal to the height of the second baffle portion 1012, so that the second lens T2 can be located within the second sub-accommodating space N2 formed by the second baffle portion 1012. The height of the side of the second conversion unit 104 can be less than or equal to the height of the third baffle portion 1013, so that the second conversion unit 104 can be located within the third sub-accommodating space N3 formed by the third baffle portion 1013.

[0138] That is, the sides of the encapsulation layer 105, the second lens T2, and the second conversion part 104 will not exceed the inner wall of the sub-accommodating space of the corresponding barrier part, which can ensure that the encapsulation layer 105 is stably disposed in the first sub-accommodating space N1, the second lens T2 is stably disposed in the second sub-accommodating space N2, and the second conversion part 104 is stably disposed in the third sub-accommodating space N3.

[0139] exist Figure 11 In this process, the main material of the encapsulation layer 105 may include methyl acrylate or acrylic. If the encapsulation layer 105 includes scattering particles, the material of the scattering particles may be titanium dioxide. The material of the second lens T2 may include methyl acrylate. The material of the second conversion section 104 may include a mixture of quantum dots and methyl acrylate.

[0140] In this embodiment, the encapsulation layer 105, the second lens T2, and the second conversion part 104 can all be formed using inkjet printing. That is, an organic solution can be printed into the sub-accommodating space N formed by the sub-barrier portion using an inkjet printhead. After the organic solution solidifies, the corresponding component can be formed within the sub-accommodating space N formed by the barrier portion. It should be noted that the surfaces of the encapsulation layer 105, the second lens T2, and the second conversion part 104 formed by inkjet printing, away from the drive backplate 200, can be either concave or convex.

[0141] refer to Figure 11 The encapsulation layer 105 is located within the first sub-accommodating space N1, and the surface of the encapsulation layer 105 away from the drive backplate 200 is recessed towards the side closer to the drive backplate 200. The second lens T2 is located within the second sub-accommodating space N2, and the surface of the second lens T2 away from the drive backplate 200 is recessed towards the side closer to the drive backplate 200, while the surface closer to the drive backplate 200 is convex towards the side closer to the drive backplate 200. The second conversion part 104 is located within the third sub-accommodating space N3, and the surface of the second conversion part 104 away from the drive backplate 200 is convex towards the side away from the drive backplate 200.

[0142] For example, the surface of the second lens T2 away from the drive back plate 200 is a concave arc-shaped surface, and the surface of the second lens T2 near the drive back plate 200 is a convex arc-shaped surface. This structure of the second lens T2 can be called a crescent-shaped structure, that is, the second lens T2 can be called a crescent-shaped condenser lens. In addition, the surface of the second conversion part 104 away from the drive back plate 200 is a convex arc-shaped surface.

[0143] In this embodiment of the application, in order to ensure that the light emitted by the light-emitting unit 102 is prevented from shining on adjacent light-emitting devices after the first conversion unit 103 performs the first conversion, the second barrier portion 1012 can be configured as a light-absorbing barrier portion. That is, the second barrier portion 1012 can have light-absorbing properties. For example, the second barrier portion 1012 can be a black barrier portion, and the material of the black barrier portion includes a black dyed material. In this case, after the light emitted by the light-emitting unit 102 undergoes the first conversion by the first conversion unit 103, the light that is directed towards adjacent light-emitting devices can be absorbed by the second barrier portion 1012, which can effectively prevent color bleeding in the display panel.

[0144] Furthermore, since the cross-section of the second barrier portion 1012 is an inverted trapezoid, when the inkjet printhead prints the organic solution into the second sub-accommodating space N2 formed by the second barrier portion 1012 during the process of forming the second barrier portion 1012 by inkjet printing, it can effectively prevent the organic solution from flowing into the adjacent light-emitting devices, thus ensuring the uniformity of the second conversion portion 104 of each light-emitting device 100.

[0145] It should be noted that reflective material can be added inside the first barrier portion 1011. This ensures that the first barrier portion 1011 is reflective, allowing light incident on it to be reflected and then directed to the second conversion portion 104 for color conversion. This effectively improves the light conversion efficiency.

[0146] It should also be noted that the third barrier portion 1013 can be a transparent barrier portion, a reflective barrier portion, or a light-absorbing barrier portion. This application embodiment does not limit this.

[0147] In this embodiment, the second conversion section 104 can be reused as the first target layer 109. The second target layer 110 is located on the side of the second conversion section 104 away from the driving backplate 200. That is, the second target layer 110 is in contact with the surface of the second conversion section 104 away from the driving backplate 200. Furthermore, the refractive index of the second target layer 110 can be made smaller than the refractive index of the second conversion section 104. Thus, the light emitted by the light-emitting unit 102, after passing through the first conversion section 103 and the second conversion section 104, is highly susceptible to total internal reflection at the interface between the second conversion section 104 and the second target layer 110, especially the light rays emanating from the edge of the light-emitting device. The totally internalized light rays can then exit normally from the area where the light-emitting device is located, effectively improving the light extraction efficiency.

[0148] In the embodiments of this application, for Figure 1 , Figure 2 , Figure 8 and Figure 9 The second conversion unit 104 in the middle, Figure 10 The first conversion unit 103 and the second conversion unit 104 in the middle, and Figure 11 For the encapsulation layer 105, the second lens T2, and the second conversion section 104, a raised structure or a recessed structure can be obtained in the following two ways.

[0149] The first type, reference Figure 12 , Figure 12 This is a schematic diagram of a concave membrane structure provided in an embodiment of this application. The barrier structure 101 includes at least a hydrophilic barrier portion made of a hydrophilic material. The liquid can be an organic solution used to form within the containment space. The organic solution can also be called ink, and thus the hydrophilic barrier portion can be referred to as a hydrophilic barrier portion.

[0150] The hydrophilic baffle is made of a hydrophilic material. In this case, during the formation of a film layer in the sub-accommodating space of the hydrophilic baffle using inkjet printing, after the inkjet printhead prints the organic solution into the sub-accommodating space of the hydrophilic baffle, because the hydrophilic baffle is made of a hydrophilic material, the organic solution can tend towards the sidewall of the hydrophilic baffle. This results in the surface of the film layer away from the drive backplate 200 after the organic solution in the sub-accommodating space has been cured, forming an arc-shaped concave surface A1 (which can be called a convex lens structure). The organic solution can be cured by ultraviolet (UV) irradiation, with a peak value of 365°.

[0151] The second option is to refer to... Figure 13 , Figure 13 This is a schematic diagram of another protruding structure membrane layer provided in an embodiment of this application. The plurality of sub-barrier portions in the barrier structure 101 include at least one hydrophobic barrier portion made of a hydrophobic material. The liquid can be an organic solution used to form within the containment space. The organic solution can also be called ink, and thus the hydrophobic barrier portion can be referred to as a hydrophobic barrier portion.

[0152] The hydrophobic barrier is made of a hydrophobic material. In this case, during the process of forming a film layer in the sub-accommodating space of the hydrophobic barrier using inkjet printing, after the inkjet printhead prints the organic solution into the sub-accommodating space of the hydrophobic barrier, because the hydrophobic barrier is made of a hydrophobic material, the organic solution can be repelled from the sidewall of the hydrophobic barrier. This results in the film layer obtained after the organic solution in the sub-barrier structure 101 has been cured, with the side away from the drive backplate 200 having an arc-shaped convex surface A2 (which can be called a concave lens structure). The organic solution can be cured by ultraviolet (UV) irradiation, with a peak value of 365°.

[0153] It should be noted that the multiple barrier sections included in the barrier structure 101 can all be hydrophilic barrier sections or all be hydrophobic barrier sections. Of course, some of the barrier sections may be hydrophilic barrier sections and others may be hydrophobic barrier sections.

[0154] Optionally, for cases where the liquid is water, the hydrophilic / hydrophobic properties of the barrier can be adjusted by adding fluorine to the barrier portion. For example, the fluorine content in the hydrophobic barrier portion is greater than that in the hydrophilic barrier portion. Alternatively, it can be said that the hydrophobic barrier portion includes fluorine, while the hydrophilic barrier portion does not.

[0155] exist Figure 1 In this process, the material of the retaining wall structure 101 can be a hydrophobic material, which allows the surface of the second conversion part 104 away from the drive back plate 200 to be an arc-shaped raised surface.

[0156] exist Figure 2 In this process, the material of the retaining wall structure 101 can be a hydrophilic material, which allows the surface of the second conversion part 102 away from the drive back plate 200 to be an arc-shaped concave surface.

[0157] exist Figure 8In the barrier structure 101, the portion of the material near the drive backplate 200 is hydrophilic, while the portion away from the drive backplate 200 is hydrophobic. Optionally, when forming the barrier structure 101, the adhesive (containing fluorine) can be applied and then cured after a certain period. Because fluorine is relatively light, it floats to the top after this period. That is, curing the adhesive after the fluorine has accumulated in the upper part makes the upper part of the barrier structure 101 hydrophobic and the lower part hydrophilic. Alternatively, Figure 8 The retaining wall structure 101 can be fabricated in two steps: first, a hydrophilic retaining wall portion is prepared using a hydrophilic material; then, a hydrophobic retaining wall portion is prepared using a hydrophobic material. This allows the surface of the second conversion part 102 away from the drive back plate 200 to be an arc-shaped concave surface, and both the first lens T1 and the second lens T2 are convex lenses.

[0158] exist Figure 9 In this design, the baffle structure 101 can be made of a hydrophobic material, allowing the surface of the second conversion section 104 away from the drive backplate 200 to be an arc-shaped convex surface. When the second conversion section 104 includes scattering particles, to ensure that the light emitted from the second conversion section 104 converges towards the center, the adhesive (containing scattering particles) can be applied and then cured after a certain period of time during the formation of the second conversion section 104. Since the scattering particles are relatively heavy, they settle in the lower part after this period. Therefore, the second conversion section 104 can have scattering particles in the area relatively close to the drive backplate 200, while the area relatively far from the drive backplate 200 does not contain scattering particles. Thus, when light passes through the second conversion section 104, it first passes through the area with scattering particles and then through the area without scattering particles, preventing the upper part of the second conversion section 104 from scattering the light before it exits, thereby improving the light converging effect.

[0159] exist Figure 10 In the barrier structure 101, the portion of the material near the drive backplate 200 is hydrophilic, while the portion away from the drive backplate 200 is hydrophobic. Optionally, when forming the barrier structure 101, the adhesive (containing fluorine) can be applied and then cured after a certain period. Because fluorine is relatively light, it floats to the top after this period. That is, curing the adhesive after the fluorine has accumulated in the upper part makes the upper part of the barrier structure 101 hydrophobic and the lower part hydrophilic. Alternatively, Figure 10 The baffle structure 101 can be fabricated in two steps: first, a hydrophilic baffle portion is prepared using a hydrophilic material; then, a hydrophobic baffle portion is prepared using a hydrophobic material. This allows the surfaces of the encapsulation layer 105 and the second conversion part 102 away from the drive backplate 200 to be arc-shaped concave surfaces, and the first lens T1 to be a convex lens.

[0160] exist Figure 11 In this configuration, the material of the first barrier portion 1011 can be a hydrophilic material, thereby making the surface of the encapsulation layer 105 away from the drive backplate 200 an arc-shaped concave surface. The material of the second barrier portion 1012 can be a hydrophilic material, thereby making the surface of the second lens T2 away from the drive backplate 200 an arc-shaped concave surface. The material of the third barrier portion 1013 can be a hydrophobic material, thereby making the surface of the second conversion portion 104 away from the drive backplate 200 an arc-shaped convex surface.

[0161] Since the surface of the first conversion section 102 away from the driving backplate 200 is a concave arc-shaped surface, the thickness of the middle part of the first conversion section 102 is relatively small. To ensure that the total thickness of the first conversion section 102 and the second conversion section 104 is sufficiently thick, thereby improving the light conversion efficiency, the surfaces of the encapsulation layer 105 away from the driving backplate and the second lens T2 away from the driving backplate can both be concave arc-shaped surfaces. This allows for increased thickness in the middle part of the second conversion section 104 by avoiding overlap in the thickness of the encapsulation layer 102 and the second lens T2. Furthermore, since the surface of the second conversion section 104 away from the driving backplate 200 is a convex arc-shaped surface, the total thickness of the middle part of the second conversion section 104 is relatively large. This can improve the transmission path of light after it enters the second conversion section 104 from the middle, thereby improving the light conversion efficiency of the second conversion section 104. In addition, it should be noted that the convex arc-shaped surface of the second conversion section 104 away from the driving backplate 200 can prevent the brightness of light from being high at a single viewing angle (such as the orthogonal viewing angle) while the brightness of other viewing angles is low, thus improving the viewing angle range of the light.

[0162] It should be noted that, Figure 11 The hydrophilicity or hydrophobicity of the first retaining wall portion 1011, the second retaining wall portion 1012, and the third retaining wall portion 1013 is merely an example. The first retaining wall portion 1011 may also be hydrophilic, and the second retaining wall portion 1012 and the third retaining wall portion 1013 may also be hydrophobic. The embodiments of this application do not specifically limit the hydrophilicity or hydrophobicity of each retaining wall portion.

[0163] In the embodiments of this application, reference is made to Figure 14 The light-emitting device 100 may further include a filter section 112 located on the side of the second conversion section 104 away from the driving backplate 200. The color of the light transmitted through the filter section 112 is the same as the color of the light emitted by the light-emitting unit 102 after passing through the first conversion section 103 and the second conversion section 104. The function of the filter section 112 is to filter out light that is not completely converted inside the light-emitting device and to reflect ambient light, thereby improving the purity of the light emitted by the light-emitting device 100.

[0164] For example, assuming the light-emitting device 100 is a red light-emitting device, then the filter section 112 can be a red filter section. Assuming the light-emitting device 100 is a green light-emitting device, then the filter section 112 can be a green filter section.

[0165] In this embodiment, the light-emitting unit 102 can be an organic light-emitting diode (OLED). For example, the light-emitting unit 102 includes an anode layer, a light-emitting layer, and a cathode layer stacked along a direction away from the driving backplane 200. In this case, the first conversion unit 103 can be integrated with the light-emitting unit 102. For example... Figure 15 In this configuration, the first conversion unit 103 can be integrated with the light-emitting unit 102.

[0166] In summary, the embodiments of this application provide a light-emitting device, which includes a baffle structure constituting a receiving space, a light-emitting unit located within the receiving space, a first conversion part that performs a first conversion on the light emitted by the light-emitting unit, and a second conversion part that performs a second conversion on the light emitted by the light-emitting unit. Through the design of the first and second conversion parts, the light emitted by the light-emitting unit undergoes two conversions, avoiding the problem of incomplete conversion after a single conversion. This prevents color mixing among multiple light-emitting devices in the display panel and avoids the loss of light color in the light-emitting devices, thereby improving the yield of the display panel.

[0167] Figure 16 This is a flowchart illustrating a method for fabricating a light-emitting device according to an embodiment of this application. (Reference) Figure 16 The method includes:

[0168] Step S101: Form a light-emitting unit on the driving backplate.

[0169] In this embodiment, the light-emitting unit 102 can be used to emit light. The light-emitting unit 102 can be directly formed on the driving backplate 200, or the light-emitting unit 102 can be first formed on another substrate and then transferred to the driving backplate 200 by mass transfer.

[0170] Optionally, multiple light-emitting devices can be fabricated simultaneously. (Reference) Figure 17 To prepare Figure 14 Taking the multiple light-emitting devices shown as an example, multiple light-emitting devices are first formed on another substrate, and then the multiple light-emitting devices are transferred to the driving backplane 200 by mass transfer.

[0171] Step S102: A first conversion section is formed on the side of the light-emitting unit away from the driving backplate.

[0172] In this embodiment, the first conversion unit 103 is used to perform a first conversion on the light emitted by the light-emitting unit 102. (See reference...) Figure 18After the first conversion section 103 is formed, an encapsulation layer 105 and a second lens T2 can be formed on the side of the first conversion section 103 away from the drive backplate 200.

[0173] Optionally, the preparation process of the first conversion unit 103 may include: hot melting a mixture of glass matrix and perovskite quantum microcrystal raw materials to obtain molten material; placing the molten material on the side of the light-emitting unit 102 away from the driving backplate 200, and then using a mold for imprinting and extreme cooling to obtain the first conversion unit 103.

[0174] Alternatively, the preparation process of the first conversion section 103 may include: forming perovskite quantum dot ink in the accommodating space N by printing or vapor deposition, and then using a vacuum concentration drying (VCD) process to solidify the organic solution to obtain the first conversion section 103.

[0175] Step S103: Form a retaining wall structure around the light-emitting unit so that the light-emitting unit is located within the receiving space formed by the retaining wall structure.

[0176] In the embodiments of this application, reference is made to Figure 19 A barrier structure 101 can be formed around the light-emitting unit 102 by applying adhesive and exposure. The barrier structure 101 can separate multiple light-emitting devices into an independent light-emitting device.

[0177] Optionally, the retaining wall structure 101 can be a black fluorine-containing retaining wall.

[0178] Step S104: A second conversion section is formed on the side of the first conversion section away from the drive backplate.

[0179] In this embodiment, the second conversion unit 104 can be used to perform a second conversion on the light emitted by the light-emitting unit 102. (See reference...) Figure 20 Within the accommodating space N formed by the barrier structure 101, the second conversion section 104 is formed by inkjet printing. Since the barrier structure 101 contains fluorine, the barrier structure 101 can be a hydrophobic barrier structure 101, and the surface of the formed second conversion section 104 away from the drive back plate 200 can be an arc-shaped raised surface.

[0180] The preparation process of the second conversion section 104 includes: printing indium phosphide or cadmium selenide quantum dot ink into the accommodating space N using an inkjet printhead; and curing the organic solution using a VCD process to obtain the second conversion section 104.

[0181] Optionally, since the solution systems of the first conversion section 103 and the second conversion section 104 are different, the two conversion sections can be formed by printing twice.

[0182] In the embodiments of this application, reference is made to Figure 21 After forming the second conversion section 104, a second target layer 110 (serving a planarizing function) may be formed on the side of the second conversion section 104 away from the drive backplate 200. The material of this second target layer 110 may include zirconium dioxide. (See reference...) Figure 22 After the second target layer 110 is formed, a plurality of filter sections 112 can be formed on the side of the second target layer 110 away from the driving back plate 200. Each filter section 112 corresponds to a light-emitting device, and there is a gap J (black) between adjacent filter sections 112 to avoid cross-color phenomenon between different light-emitting devices.

[0183] In summary, this application provides a method for fabricating a light-emitting device. The light-emitting device fabricated by this method includes a baffle structure constituting a receiving space, a light-emitting unit located within the receiving space, a first conversion section that performs a first conversion on the light emitted by the light-emitting unit, and a second conversion section that performs a second conversion on the light emitted by the light-emitting unit. Through the design of the first and second conversion sections, the light emitted by the light-emitting unit undergoes two conversions, avoiding the problem of incomplete conversion after a single conversion. This prevents color mixing among multiple light-emitting devices in the display panel and avoids the loss of light color in the light-emitting devices, thereby improving the yield of the display panel.

[0184] This application embodiment also provides a display panel, the display panel 01 including: a driving backplate 200 and a plurality of light-emitting devices 100 arranged in an array on the driving backplate 200. The driving backplate 200 can be used to provide driving signals to the plurality of light-emitting devices 100, and the light-emitting devices 100 are used to emit light under the drive of the driving signals.

[0185] The driving backplane 200 includes a substrate and a driving circuit located on the substrate. The driving circuit is connected to multiple light-emitting devices.

[0186] Optionally, among the multiple light-emitting devices 100 included in the display panel 01, some light-emitting devices can be red light-emitting devices, some light-emitting devices can be green light-emitting devices, and some light-emitting devices can be blue light-emitting devices.

[0187] In this blue light-emitting device, the first conversion section, the second conversion section, and the filter section can all be made of transparent materials. That is, the blue light-emitting device can output light directly without conversion.

[0188] Figures 22 to 25 The display panels shown each display a red light-emitting device R, a green light-emitting device G, and a blue light-emitting device B.

[0189] exist Figure 25The light-emitting unit 102 in the red light-emitting device R can be a red chip that emits red light. Figure 25 The light-emitting unit 102 in the green light-emitting device G can be a green chip that emits green light. Figure 25 The light-emitting unit 102 in the blue light-emitting device B can be a blue chip that emits blue light. This solution can be achieved by integrating the first conversion unit 103 and the light-emitting unit 102.

[0190] Since the display panel can have essentially the same technical effects as the light-emitting device described in the previous embodiments, for the sake of brevity, the technical effects of the display panel will not be described again here.

[0191] Figure 26 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. (Reference) Figure 26 The display device includes a power supply component 01 and a display panel 01. The power supply component 02 is connected to the display panel 01 and is used to supply power to the display panel 01.

[0192] Optionally, the display device can be any product or component with display function, such as a mobile phone, tablet computer, television, advertising machine, display screen, digital photo frame, etc.

[0193] Since the display device can have essentially the same technical effects as the light-emitting device described in the previous embodiments, for the sake of brevity, the technical effects of the display device will not be described again here.

[0194] The terminology used in the embodiments section of this application is for explaining the embodiments of this application only and is not intended to limit this application. Unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains.

[0195] The terminology used in the embodiments section of this application is for illustrative purposes only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in the patent application specification and claims of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected," "linked," and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up," "down," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0196] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0197] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A light-emitting device, characterized in that, The light-emitting device includes: A retaining wall structure located on the drive backplate, the retaining wall structure forming an accommodating space; A light-emitting unit located on the drive backplate and within the receiving space, the light-emitting unit being used to emit light; A first conversion section is located on the side of the light-emitting unit away from the driving back plate. The first conversion section is used to perform a first conversion on the light emitted by the light-emitting unit. And a second conversion unit located on the side of the first conversion unit away from the drive back plate, the second conversion unit being used to perform a second conversion on the light emitted by the light-emitting unit.

2. The light-emitting device according to claim 1, characterized in that, The light-emitting device further includes an encapsulation layer located between the first conversion part and the second conversion part, the encapsulation layer being used to encapsulate the first conversion part.

3. The light-emitting device according to claim 2, characterized in that, The encapsulation layer is also used to scatter the light passing through the first conversion unit; The encapsulation layer includes a main material and scattering particles. The main material is at least one of methyl acrylate, ethyl acrylate, methyl 2-methacrylate, and ethyl 2-methacrylate. The scattering particles are at least one of titanium dioxide and zinc oxide.

4. The light-emitting device according to claim 1, characterized in that, The material of the first conversion section includes at least perovskite quantum dots, and the material of the second conversion section includes at least indium phosphide or cadmium selenide quantum dots.

5. The light-emitting device according to any one of claims 1 to 4, characterized in that, The first conversion unit is used to convert the light emitted by the light-emitting unit into light of a first wavelength, and the second conversion unit is used to convert the light of the first wavelength into light of a second wavelength; Wherein, the first wavelength is less than or equal to the second wavelength.

6. The light-emitting device according to claim 5, characterized in that, The light-emitting device is a red light-emitting device; The light-emitting unit is a blue light chip, the first wavelength of light is red or green light, and the second wavelength of light is red light; or, the light-emitting unit is a violet light chip, the first wavelength of light is blue light, and the second wavelength of light is red light.

7. The light-emitting device according to claim 5, characterized in that, The light-emitting device is a green light-emitting device; The light-emitting unit is a blue light chip, the first wavelength of light is green light, and the second wavelength of light is green light; or, the light-emitting unit is a violet light chip, the first wavelength of light is blue light, and the second wavelength of light is green light.

8. The light-emitting device according to any one of claims 1 to 4, characterized in that, The orthographic projection of the second conversion unit on the drive back plate covers the orthographic projection of the light-emitting unit on the drive back plate, and also covers the orthographic projection of the first conversion unit on the drive back plate. The surface of the second conversion part away from the drive back plate is convex towards the side away from the drive back plate, or the surface of the second conversion part away from the drive back plate is concave towards the side close to the drive back plate.

9. The light-emitting device according to any one of claims 1 to 4, characterized in that, The light-emitting device includes: a first target layer and a second target layer located on the side of the second conversion section away from the driving backplate; The refractive index of the first target layer is different from that of the second target layer.

10. The light-emitting device according to claim 10, characterized in that, The first target layer includes a first lens, the orthographic projection of the first lens on the driving back plate covers the orthographic projection of the light-emitting unit on the driving back plate, and the surface of the first lens away from the driving back plate is convex to the side away from the driving back plate.

11. The light-emitting device according to any one of claims 1 to 4, characterized in that, The light-emitting device further includes: a second lens located on the side of the second conversion section near the driving back plate; the barrier structure includes: a plurality of barrier sections stacked sequentially in a direction away from the driving back plate; the barrier structure includes a plurality of sub-accommodating spaces formed by the plurality of barrier sections; The light-emitting unit, the first conversion part, the second conversion part, and the second lens are located at least within the plurality of sub-accommodating spaces.

12. The light-emitting device according to claim 11, characterized in that, The plurality of retaining wall portions include: a first retaining wall portion, a second retaining wall portion, and a third retaining wall portion stacked in a direction away from the drive back plate; the plurality of sub-accommodating spaces include a first sub-accommodating space formed by the first retaining wall portion, a second sub-accommodating space formed by the second retaining wall portion, and a third sub-accommodating space formed by the third retaining wall portion; The cross-sectional area of ​​the first retaining wall portion in the direction perpendicular to the thickness of the drive back plate decreases as the distance from the drive back plate increases. The encapsulation layer is located within the first sub-accommodating space, and the surface of the encapsulation layer away from the drive back plate is recessed towards the side closer to the drive back plate. The cross-sectional area of ​​the second retaining wall portion in the direction perpendicular to the thickness of the drive back plate increases with the increase of the distance from the drive back plate. The second lens is located in the second sub-accommodating space, and the surface of the second lens away from the drive back plate is concave towards the side closer to the drive back plate. The cross-sectional area of ​​the third retaining wall portion in the direction perpendicular to the thickness of the drive back plate decreases as the distance from the drive back plate increases. The second conversion portion is located within the third sub-accommodating space, and the surface of the second conversion portion away from the drive back plate protrudes to the side away from the drive back plate.

13. The light-emitting device according to any one of claims 1 to 4, characterized in that, The light-emitting device further includes a filter section located on the side of the second conversion section away from the driving back plate; The color of the light that can be transmitted through the filter section is the same as the color of the light after it has passed through the first conversion section and the second conversion section.

14. The light-emitting device according to any one of claims 1 to 4, characterized in that, The light-emitting unit includes an anode layer, a light-emitting layer, and a cathode layer stacked in a direction away from the drive backplate, and the first conversion unit and the light-emitting unit are integrated.

15. A method for fabricating a light-emitting device, characterized in that, The method includes: A light-emitting unit is formed on the drive backplate, and the light-emitting unit is used to emit light. A first conversion section is formed on the side of the light-emitting unit away from the driving back plate. The first conversion section is used to perform a first conversion on the light emitted by the light-emitting unit. A retaining wall structure is formed around the light-emitting unit so that the light-emitting unit is located within the receiving space formed by the retaining wall structure; A second conversion section is formed on the side of the first conversion section away from the drive back plate. The second conversion section is used to perform a second conversion on the light emitted by the light-emitting unit.

16. A display panel, characterized in that, The display panel includes: a driving backplate and a plurality of light-emitting devices as described in any one of claims 1 to 14 arranged in an array on the driving backplate; The driving backplate is used to provide driving signals for the plurality of light-emitting devices, and the light-emitting devices are used to emit light under the drive of the driving signals.

17. The display panel according to claim 16, characterized in that, The driving backplane includes a substrate and a driving circuit located on the substrate, and the driving circuit is connected to a plurality of light-emitting devices.

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