Quantum dot color film, display panel and manufacturing method of quantum dot color film

Abstract

The invention relates to a quantum dot color film, a display panel and a manufacturing method of the quantum dot color film, and the quantum dot color film comprises a light guide film layer which comprises a first light emitting part and a second light emitting part; the second light emitting part comprises a light guide part obliquely connected with the first light emitting part and a light transmission sub-part connected with the light guide part, the light transmission sub-part is flush with the first light emitting part, and a gap is formed between the light transmission sub-part and the first light emitting part; the quantum dot layer is formed on the surfaces of the light transmission sub-part and the first light emitting part; the barrier layer covers the surface of the quantum dot layer; and the black matrix is formed in the gap, and the black matrix covers the periphery of the quantum dot layer.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a quantum dot color film, a display panel, and a method for manufacturing the quantum dot color film. Background Art

[0002] Quantum dot (QD) materials are increasingly used in display panels due to their adjustable emission wavelength, narrow half-width and good stability. Currently, QD materials are mainly used in quantum dot tubes (QD Tube) and quantum dot films (QD Film), but these two applications are limited to liquid crystal displays (LCDs). By utilizing the photoluminescent characteristics of QD materials and making QD materials into color filters (CF), the application areas of QD materials (such as OLED, MicroLED, etc.) can be greatly improved.

[0003] In the existing display panels with quantum dot color film substrate structures, much of the incident light emitted by the light-emitting devices in the display panel to its quantum dot color film substrate is scattered light. During the propagation process, part of the scattered light is absorbed by the black matrix (black bank material) in the quantum dot color film substrate, resulting in low light utilization of the display panel and making the display of the display panel darker. The existing solution is to increase the luminous intensity of the light-emitting devices in the display panel to compensate for the problem of low light utilization, but this will cause high energy waste.

[0004] The method adopted by the related technology is to provide a quantum dot layer, which includes a plurality of light outgoing films arranged in an array and a black matrix arranged between the light outgoing films; the film surface of each light outgoing film layer on the illuminated side is provided with a plurality of light outgoing grooves, and the light outgoing grooves are filled with light outgoing convex structures. The convex structure of the light outgoing convex structure plays the role of a convex mirror focusing in the quantum dot color film substrate, increasing the optical path of the incident light irradiated to the quantum dot color film substrate in the quantum dot layer, so that more light can pass through the quantum dot layer. However, this technology has defects: first, the light outgoing convex structure has a limited light angle, and the light close to the periphery of the black matrix with the adjusted light angle is still absorbed by the black matrix, that is, the light is not fully utilized.

[0005] Therefore, when the quantum dot material of the quantum dot color film layer is stimulated to emit light, improving the luminous efficiency of the quantum dot color film substrate is a technical problem that needs to be solved urgently. Summary of the invention

[0006] The present application provides a display panel and a method for manufacturing a quantum dot color film, which can solve the problem of luminous efficiency of the quantum dot color film.

[0007] A quantum dot color film, comprising: The light output film layer comprises a first light output portion and a second light output portion; the second light output portion comprises a light guiding portion obliquely connected to the first light output portion and a light transmission sub-portion connected to the light guiding portion, the light transmission sub-portion is flush with the first light output portion, and a gap is formed between the light transmission sub-portion and the first light output portion; a quantum dot layer formed on the surface of the light transmission sub-section and the first light emitting section; a barrier layer covering the surface of the quantum dot layer; and A black matrix is ​​formed in the gap, and the black matrix covers the periphery of the quantum dot layer.

[0008] By adopting the above scheme, the light output film layer includes a first light output part and a second light output part. The second light output part is composed of a light guiding part and a light transmission sub-part. The light transmission sub-part is parallel to the first light output part but there is a gap between them. This structure can effectively guide and distribute light to ensure that the light can effectively reach the quantum dot layer.

[0009] In one of the embodiments, each light transmission sub-section is connected to four of the light guiding sections.

[0010] By adopting the above solution, each light transmission sub-unit is connected to four light guiding parts. When this structure is subsequently used for a display panel, light from the four sides of the light-emitting unit can be guided to be transmitted in the forward direction. This design enhances the guiding effect and uniformity of the light.

[0011] In one embodiment, each of the light transmission sub-portions has the same size as the first light emitting portion.

[0012] By adopting the above solution, each light transmission sub-section has the same size as the first light emitting section, thereby ensuring the uniformity and stability of the light.

[0013] In one embodiment, the light output film layer includes a first film layer and a second film layer, the first light output portion includes the first film layer and the second film layer which are stacked, and the second light output portion includes only the first film layer.

[0014] By adopting the above scheme, through the stacking arrangement of different film layers, diversity of light output film layer structures is provided, which may be helpful to adjust the propagation characteristics of light.

[0015] In one embodiment, the first film layer is a whole sheet structure or a strip structure that is overlapped and intersected.

[0016] By adopting the above solution, flexibility is provided for the structure of the first film layer, which helps the quantum dot color film to fit closely with the remaining layer structures of the display panel.

[0017] In one of the embodiments, a surface of the second light emitting portion that is away from the light emitting side is a concave portion, and the concave portion is filled with a black photoresist or a heat dissipation medium.

[0018] By adopting the above solution, the surface of the second light emitting portion facing away from the light emitting side is a concave portion filled with black photoresist or heat dissipation medium. This design helps to manage the transmission and heat dissipation of light and ensure the stability and reliability of the display panel.

[0019] In one embodiment, the light guiding portion includes two opposite surfaces, and the two surfaces are coated with a reflective film.

[0020] By adopting the above solution, the light guiding part includes two opposite surfaces coated with a reflective film. The application of the reflective film can increase the reflection and guiding effect of light and improve the efficiency and brightness of the display panel.

[0021] A display panel, comprising: A substrate, and a plurality of light-emitting units disposed on the substrate; and As described above, in the quantum dot color film, each of the light-emitting units is arranged corresponding to the first light emitting portion, the first part of the light beam emitted by the light-emitting unit can be emitted through the first light emitting portion, and the second part of the light beam emitted by the light-emitting unit can be guided by the light guiding portion to be emitted from the light transmission sub-portion.

[0022] By adopting the above scheme, the forward light emitted by the light-emitting unit directly reaches the quantum dot layer from the first light emitting part, and the large-angle light emitted by the light-emitting unit reaches the light transmission sub-part through the guidance of the light guiding part, and is then transmitted to the quantum dot layer through the light transmission sub-part. Therefore, the light emitted by the light-emitting unit can be basically fully utilized, avoiding the large-angle light being absorbed by the black matrix and affecting the luminous efficiency of the quantum dot color film.

[0023] In one of the embodiments, an array of black photoresists is disposed on the substrate, a surface of the second light emitting portion facing away from the light emitting side is attached to the black photoresist, the black photoresist includes an opening, and the light emitting unit is disposed in the opening.

[0024] By adopting the above solution, an array of black photoresists is arranged on the substrate, and the surface of the second light emitting portion is in contact with the black photoresist. The opening of the black photoresist allows the light emitting unit to be arranged therein, which helps to manage heat and improve the stability of the display panel.

[0025] The present application also relates to a method for manufacturing a quantum dot color film, comprising: A light output film layer is provided, wherein the light output film layer comprises a first light output portion and a second light output portion; the second light output portion comprises a light guiding portion obliquely connected to the first light output portion and a light transmission sub-portion connected to the light guiding portion, the light transmission sub-portion is flush with the first light output portion, and a gap is formed between the light transmission sub-portion and the first light output portion; forming a quantum dot layer on the surface of the light transmission sub-section and the first light emitting section; forming a barrier layer on the surface of the quantum dot layer; and A black matrix is ​​formed in the gap, and the black matrix can cover the periphery of the quantum dot layer.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. By adopting the above solution, the light guide part can be used to effectively guide and distribute the light, ensuring that the light can effectively reach the quantum dot layer, thereby improving the utilization rate of the quantum dot color film for light.

[0027] 2. By adopting the above solution, when the quantum dot color film needs to be cut, the quantum dot color film can be cut from the position of the black matrix, which will not damage the quantum dot layer, thereby preventing the quantum dots from being corroded by water and oxygen from the edge.

[0028] 3. The display panel provided in the present application utilizes a light-outlet film layer to form new display nodes between adjacent light-emitting units, thereby further improving pixel density, display resolution, and visual transition effects of images. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a cross-sectional structural diagram of a quantum dot color film provided in the first embodiment of the present application; Figure 2 yes Figure 1 A top view of the provided quantum dot color film; Figure 3 yes Figure 1 A top view of another quantum dot color film is provided; Figure 4 yes Figure 1 A schematic diagram of the structure of a display panel formed by the provided quantum dot color film; Figure 5 is a cross-sectional structural diagram of a quantum dot color film provided in the second embodiment of the present application; Figure 6 is a cross-sectional structural diagram of a quantum dot color film provided in the third embodiment of the present application; Figure 7 yes Figure 6 A schematic diagram of the structure of a display panel formed by the provided quantum dot color film; Figure 8It is a schematic diagram of the structure of a display panel formed by another quantum dot color film.

[0030] Description of reference numerals: 1. Light guide out film layer; 10. First light emitting part; 12. Second light emitting part; 120. Light guide part; 122. Light transmission sub-part; 101. Gap; 2. Quantum dot layer; 3. Barrier layer; 13. First film layer; 14. Second film layer; 130. First film strip; 132. Second film strip; 124. Concave part; 4. Black matrix; 5. First black photoresist; 134. Connecting surface; 100. Quantum dot color film; 200. Display panel; 6. Substrate; 7. Light emitting unit; 8. Second black photoresist; 71. First partial light beam; 72. Second partial light beam; 9. Heat dissipation medium. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-8 The substrate further describes in detail the method for manufacturing a display panel and a quantum dot color film provided in the present application to solve the problem of the luminous efficiency of the quantum dot color film.

[0032] Example 1 See also Figure 1 , Figure 1 A quantum dot color film 100 is provided, and the quantum dot color film 100 includes: a light output film layer 1, a quantum dot layer 2, a barrier layer 3, and a black matrix 4.

[0033] The light output film layer 1 includes a first light output portion 10 and a second light output portion 12. The second light output portion 12 includes a light guiding portion 120 obliquely connected to the first light output portion 10 and a light transmission sub-portion 122 connected to the light guiding portion 120, the light transmission sub-portion 122 is flush with the first light output portion 10, and a gap 101 is formed between the light transmission sub-portion 122 and the first light output portion 10.

[0034] In this embodiment, there is no limitation on the material of the light output film layer, as long as the material and structure of the light output film layer 1 can guide the light so that the light is transmitted in the light transmission direction.

[0035] See also Figure 2 In one embodiment, each light transmission sub-unit 122 is connected to four light guiding units 120. Each light transmission sub-unit 122 is connected to four light guiding units 120. When this structure is used for a display panel, the light emitted from the four sides of the light emitting unit can be guided and transmitted to the second light emitting unit 12 in the forward direction. This design enhances the guiding effect and uniformity of the light and allows as much light as possible to be emitted.

[0036] In this embodiment, each of the light transmission sub-portions 122 has the same size as the first light emitting portion 10. Each of the light transmission sub-portions 122 has the same size as the first light emitting portion 10, which ensures the uniformity and stability of the light.

[0037] In this embodiment, the light guiding portion 120 includes two opposite connection surfaces 134, and the two connection surfaces 134 are plated with a reflective film (not shown). The reflective film can increase the reflection and guiding effect of light, and improve the efficiency and brightness of the display panel.

[0038] The quantum dot layer 2 is formed on the surface of the light transmission sub-section 122 and the first light emitting section 10; quantum dots are dispersed and arranged in the quantum dot layer 2, and light is refracted and toned into corresponding colors after passing through the corresponding quantum dots. The quantum dot layer 2 includes a blue quantum dot film made of a blue quantum dot material, a green quantum dot film made of a green quantum dot material, or a red quantum dot film made of a red quantum dot material. Obviously, the quantum dot layer 2 can also be a quantum dot film made of other color quantum dot materials, and the material of the light-transmitting film is a transparent resin material. For example, the quantum dot layer 2 includes a plurality of array-distributed red quantum dot color films, green quantum dot color films, and a transparent film layer. The materials of the red quantum dot color film and the green quantum dot color film are perovskite materials, and the perovskite material is MAPbX3 (X is one or more combinations of Cl, Br, and I). The luminescence spectrum of the perovskite material can change with the change of the X element in CsPbX3, so it is possible to obtain a perovskite material that emits red or green light through different combinations of the X element. The embodiment of the present application can prepare a red quantum dot color film, a green quantum dot color film, and a transparent film layer by inkjet printing.

[0039] The barrier layer 3 covers the surface of the quantum dot layer 2 and is used to protect the quantum dot layer 2 and to block the quantum dot layer 2 from being corroded by water and oxygen.

[0040] The black matrix 4 is formed in the gap 101, and the black matrix 4 covers the periphery of the quantum dot layer 2. The black matrix 4 is used to prevent the mutual crosstalk of the light passing through the first light emitting portion 10 and the second light emitting portion 12. The thickness of the black matrix 4 is at least higher than the quantum dot layer 2 to cover the surroundings of the quantum dot layer 2 to enhance the ability of the quantum dot layer 2 to block water and oxygen. As a result, moisture and oxygen in the surrounding environment are not easy to enter the quantum dots surrounded by the black matrix 4.

[0041] It can be understood that a color filter layer is also provided in the light emitting direction of the quantum dot color film 100. In the present application, since the structure of the color filter layer is not improved, Figure 1The color filter layer includes a plurality of red color resists, green color resists, and blue color resists arranged in an array. The red quantum dot color film corresponds to the red color resist, the green quantum dot color film corresponds to the green color resist, and the transparent film layer corresponds to the blue color resist.

[0042] By adopting the above scheme, the light output film layer 1 includes a first light emitting portion 10 and a second light emitting portion 12. The second light emitting portion 12 is composed of a light guiding portion 120 and a light transmission sub-portion 122. The light transmission sub-portion 122 is parallel to the first light emitting portion 10 but there is a gap 101 between them. This structure can effectively guide and distribute light, ensure that the light can effectively reach the quantum dot layer 2, reduce the large-angle light emitted by the light-emitting unit 7 incident on the black matrix 4 to be absorbed by the black matrix 4, and reduce the utilization rate of light by the quantum dot color film 100.

[0043] In the related art, since the quantum dot color film 100 needs to be cut into a suitable size, the quantum dot structure on the side will be destroyed by water (H2O) and oxygen (O2) after cutting and lose the function of stimulating red and green light. When the depth of water (H2O) and oxygen (O2) invading the quantum dot structure reaches the distance that can be recognized by the human eye, the quantum dot structure will fail, and the undesirable phenomenon of blue tinting will appear around the blue light MiniLed module when it is lit. In the present invention, since the quantum dot color film 100 is composed of a number of independent units corresponding to the light emitting part, each independent quantum dot unit is covered by a black matrix on all sides, so when the quantum dot color film 100 needs to be cut, it can be cut from the position of the black matrix, so that the quantum dots will not be damaged.

[0044] In one embodiment, the first film layer 13 is a whole sheet structure or a strip structure intersecting and overlapping. Figure 2 In the embodiment, the first film layer 13 is a whole piece structure. Figure 3 In the embodiment, the first film layer 13 is formed by crossing a first film strip 130 along a first direction and a second film strip 132 along a second direction. By adopting the above solution, flexibility is provided for the structural design of the first film layer 13, which helps the quantum dot color film 100 and the other layer structures of the display panel 200 to fit closely.

[0045] See also Figure 4 , Figure 4 A display panel 200 is provided, comprising: a substrate 6 , a plurality of light-emitting units 7 disposed on the substrate 6 , and a quantum dot color film 100 .

[0046] The light-emitting unit 7 can be one of a blue OLED, a blue Micro-LED, and a blue Mini-LED. The quantum dot color film 100 is arranged in the light-emitting direction of the light-emitting unit 7. Each light-emitting unit 7 is arranged corresponding to the first light-emitting portion 10. The first partial light beam 71 emitted by the light-emitting unit 7 can be emitted through the first light-emitting portion 10. The second partial light beam 72 emitted by the light-emitting unit 7 can be guided by the light-guiding portion 120 to be emitted from the light-transmitting sub-portion 122.

[0047] By adopting the above scheme, the forward light emitted by the light-emitting unit 7 directly reaches the quantum dot layer 2 from the first light emitting part 10, and the large-angle light emitted by the light-emitting unit 7 reaches the light transmission sub-part 122 through the guidance of the light guiding part 120, and is then transmitted to the quantum dot layer 2 through the light transmission sub-part 122. Therefore, the light emitted by the light-emitting unit 7 can be basically fully utilized, avoiding the large-angle light being absorbed by the black matrix 4 and affecting the luminous efficiency of the quantum dot color film 100.

[0048] In one embodiment, the substrate 6 is provided with a second black photoresist 8 arranged in an array, the surface of the second light emitting portion 12 facing away from the light emitting side is in contact with the second black photoresist 8, the second black photoresist 8 includes an opening, and the light emitting unit 7 is arranged in the opening. The substrate 6 is provided with a second black photoresist 8 arranged in an array, and the surface of the second light emitting portion 12 is in contact with the second black photoresist 8. The opening of the second black photoresist 8 allows the light emitting unit 7 to be arranged therein, and this structure helps to manage heat and improve the stability of the display panel.

[0049] The present application also relates to a method for manufacturing a quantum dot color film 100, comprising: S1: Provide a light output film layer 1, wherein the light output film layer 1 comprises a first light output portion 10 and a second light output portion 12; the second light output portion 12 comprises a light guiding portion 120 obliquely connected to the first light output portion 10 and a light transmission sub-portion 122 connected to the light guiding portion 120, wherein the light transmission sub-portion 122 is flush with the first light output portion 10, and a gap 101 is formed between the light transmission sub-portion 122 and the first light output portion 10.

[0050] S2: forming a quantum dot layer 2 on the surfaces of the light transmission sub-section 122 and the first light emitting section 10 .

[0051] S3: forming a barrier layer 3 on the surface of the quantum dot layer 2 .

[0052] S4: forming a black matrix 4 in the gap 101 , and the black matrix 4 can cover the periphery of the quantum dot layer 2 .

[0053] Example 2 See also Figure 5, Embodiment 2 is basically the same as Embodiment 1, except that, in this embodiment, the light output film layer 1 includes a first film layer 13 and a second film layer 14, the first light output portion 10 includes a first film layer 13 and a second film layer 14 stacked, and the second light output portion 12 includes only the first film layer 13. The stacking of different film layers provides a diversity of the structure of the light output film layer 1, which may help to adjust the propagation characteristics of light. The first film layer 13 and the second film layer 14 are made of the same material, and the first film layer 13 and the second film layer 14 are fixed with an adhesive layer. In other embodiments, in order to improve the light extraction efficiency, the first film layer 13 and the second film layer 14 may also be made of different materials.

[0054] Example 3 See also Figure 6 The structure of the quantum dot color film provided in Example 3 is basically the same as that in Example 1, except that, in this embodiment, the concave portion 124 formed on the surface of the second light emitting portion 12 facing away from the light emitting side is filled with the first black photoresist 5 and / or the heat dissipation medium 9.

[0055] The first black photoresist 5 is filled in the concave portion 124 to provide additional structural stability and prevent the light output film layer 1 from being deformed due to thermal expansion or mechanical stress. Of course, in order to further improve the stability of the structure.

[0056] See also Figure 7 When the quantum dot color film is used for a display panel, there is no need to set a black photoresist on the substrate 6. The large-angle light emitted by the light-emitting unit 7 can still be absorbed by the first black photoresist 5. The adjacent light-emitting units 7 can be filled with a heat dissipation medium or not filled. Compared with Example 1, the heat dissipation effect is better.

[0057] In yet another possible embodiment, see Figure 8 The first black photoresist 5 may also protrude from the recess 124 , and the protruding portion may be embedded between adjacent light-emitting units 7 . A heat dissipation medium 9 is disposed between adjacent light-emitting units 7 , and the surface of the heat dissipation medium 9 contacts the first black photoresist 5 protruding from the surface of the recess 124 .

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A quantum dot color film, characterized in that: include: A light-guiding film layer (1) comprises a first light-emitting portion (10) and a second light-emitting portion (12); the second light-emitting portion (12) comprises a light-guiding portion (120) obliquely connected to the first light-emitting portion (10) and a light-transmitting sub-portion (122) connected to the light-guiding portion (120); the light-transmitting sub-portion (122) is flush with the first light-emitting portion (10); a gap (101) is formed between the light-transmitting sub-portion (122) and the first light-emitting portion (10); A quantum dot layer (2) formed on the surface of the light transmission sub-section (122) and the first light emitting section (10); A barrier layer (3) covering the surface of the quantum dot layer (2); as well as A black matrix (4) is formed in the gap (101), and the black matrix (4) covers the periphery of the quantum dot layer (2).

2. The quantum dot color film according to claim 1, characterized in that: Each light transmission sub-section (122) is connected to four of the light guiding sections (120).

3. The quantum dot color film according to claim 1, characterized in that: Each of the light transmission sub-sections (122) has the same size as the first light emitting section (10).

4. The quantum dot color film according to claim 2, characterized in that: The light-guiding film layer (1) comprises a first film layer (13) and a second film layer (14); the first light-emitting portion (10) comprises the first film layer (13) and the second film layer (14) which are stacked; and the second light-emitting portion (12) comprises only the first film layer (13).

5. The quantum dot color film according to claim 4, characterized in that: The first film layer (13) is a whole-piece structure or is composed of a plurality of overlapping strip structures.

6. The quantum dot color film according to claim 1, characterized in that: The surface of the second light emitting portion (12) facing away from the light emitting side is a concave portion (124), and the concave portion (124) is filled with a first black photoresist (5) and / or a heat dissipation medium.

7. A quantum dot color film according to any one of claims 1 to 6, characterized in that: The light guiding portion (120) comprises two opposite connecting surfaces (134), and the two connecting surfaces (134) are respectively coated with a reflective film.

8. A display panel, characterized in that: include: base(6); A plurality of light-emitting units (7) arranged on the substrate; as well as According to the quantum dot color film as described in any one of claims 1 to 6, each of the light-emitting units (7) is arranged corresponding to the first light emitting portion (10), and the first partial light beam (71) emitted by the light-emitting unit (7) can be emitted through the first light emitting portion (10), and the second partial light beam (72) emitted by the light-emitting unit (7) can be guided by the light guiding portion (120) to be emitted from the light transmission sub-portion (122).

9. The display panel according to claim 8, characterized in that: The substrate (6) is provided with a second black photoresist (8) arranged in an array, the surface of the second light emitting portion (12) facing away from the light emitting side is in contact with the second black photoresist (8), the second black photoresist (8) comprises an opening, and the light emitting unit (7) is arranged in the opening.

10. A method for preparing a quantum dot color film, characterized in that: include: A light-guiding film layer (1) is provided, wherein the light-guiding film layer (1) comprises a first light-emitting portion (10) and a second light-emitting portion (12); the second light-emitting portion (12) comprises a light-guiding portion (120) obliquely connected to the first light-emitting portion (10) and a light-transmitting sub-portion (122) connected to the light-guiding portion (120); the light-transmitting sub-portion (122) is flush with the first light-emitting portion (10); and a gap (101) is formed between the light-transmitting sub-portion (122) and the first light-emitting portion (10); forming a quantum dot layer (2) on the surface of the light transmission sub-section (122) and the first light emitting section (10); forming a barrier layer (3) on the surface of the quantum dot layer (2); and A black matrix (4) is formed in the gap (101), and the black matrix (4) can cover the periphery of the quantum dot layer (2).

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