Backlight module, preparation method thereof and display device
By introducing a light conversion unit and a color conversion film into the backlight module, the problems of uneven brightness and light leakage in the display device's aperture area are solved, improving display quality and brightness uniformity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XIAMEN TIANMA MICRO ELECTRONICS
- Filing Date
- 2023-05-08
- Publication Date
- 2026-07-21
Smart Images
Figure CN116598408B_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of display technology, and in particular relates to a backlight module and its manufacturing method, and a display device. Background Technology
[0002] With the development of display technology, the requirements for screen-to-body ratio of display devices are becoming increasingly higher. The existence of technologies such as punch-hole and irregular shapes means that some areas in the backlight module of the display device cannot be effectively utilized, resulting in poor brightness uniformity of the backlight module. Summary of the Invention
[0003] This application provides a backlight module and its manufacturing method, as well as a display device. The backlight module can improve the uniformity of its backlight brightness, while also improving the problem of abnormal light emission from the aperture area and enhancing the backlight quality.
[0004] An embodiment of a first aspect of this application provides a backlight module, including an aperture region and a backlight region surrounding at least a portion of the aperture region, the backlight module comprising:
[0005] The substrate includes a body portion located in the backlight region and a first through hole located in the hole region;
[0006] The light-emitting layer includes a light-emitting element and a color conversion film. Along the light emission direction of the backlight module, the color conversion film is located on the side of the light-emitting element away from the substrate, and the light-emitting layer is located in the backlight area and on one side of the substrate.
[0007] The light conversion unit, along the light emission direction of the backlight module, includes a second through hole disposed opposite to the first through hole. Along the first direction, the light conversion unit is disposed on the side of the light-emitting layer facing the hole area. Along the first direction, the orthographic projection of the light conversion unit is a first projection, and the orthographic projection of the light-emitting layer is a second projection. The first projection and the second projection at least partially overlap. The light conversion unit converts part of the light emitted by the light-emitting element into white light.
[0008] The first direction is the direction from which the backlight area points to the hole area.
[0009] A second aspect of this application also provides a method for fabricating a backlight module, the backlight module including an aperture region and a backlight region surrounding at least a portion of the aperture region, the fabrication method comprising:
[0010] A substrate is provided, the substrate including a body portion and a first through hole, the body portion being located in the backlight area, and the first through hole being located in the hole area;
[0011] A light-emitting layer and a light-converting section are formed. The light-emitting layer is formed in the backlight area and located on one side of the substrate, along the light emission direction of the backlight module. The color conversion film is formed on the side of the light-emitting element away from the substrate. Along a first direction, the light-converting section is disposed on the side of the light-emitting layer facing the aperture area. The light-converting section includes a second through-hole. Along the light emission direction of the backlight module, the second through-hole is disposed opposite to the first through-hole. Along the first direction, the orthographic projection of the light-converting section is a first projection, and the orthographic projection of the light-emitting layer is a second projection. The first projection and the second projection at least partially overlap. The light-converting section converts part of the light emitted by the light-emitting element into white light. The first direction is the direction from the backlight area to the aperture area.
[0012] An embodiment of the third aspect of this application also provides a display device, including the backlight module provided in the first aspect of this application.
[0013] The backlight module provided in this application converts at least a portion of the light emitted from the light-emitting element toward the aperture area into white light through a light conversion unit. This provides supplementary lighting to the aperture area, reducing the brightness difference between the aperture area and the backlight area and improving backlight brightness uniformity. Furthermore, it prevents light emitted by the light-emitting element from being emitted directly without conversion, which could lead to display abnormalities in the aperture area, such as blue light leakage, affecting the display quality of the display panel. In other words, the backlight module provided in this application can improve its own backlight brightness uniformity while simultaneously addressing the problem of abnormal light emission from the aperture area and improving backlight quality. Attached Figure Description
[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the 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.
[0015] Figure 1 This is a schematic diagram of the structure of a backlight module provided in an embodiment of this application;
[0016] Figure 2 yes Figure 1 A cross-sectional view along P-P';
[0017] Figure 3 yes Figure 1 Another sectional view along P-P';
[0018] Figure 4 yes Figure 1 Another sectional view along P-P';
[0019] Figure 5 yes Figure 1 Another sectional view along P-P';
[0020] Figure 6 yes Figure 1 Another sectional view along P-P';
[0021] Figure 7 This is a schematic diagram of the structure of the light conversion unit in a backlight module provided in an embodiment of this application;
[0022] Figure 8 yes Figure 7 A cross-sectional schematic diagram of the light conversion section;
[0023] Figure 9 yes Figure 1 Another sectional view along P-P';
[0024] Figure 10 This is a cross-sectional schematic diagram of the light conversion section in a backlight module provided in an embodiment of this application;
[0025] Figure 11 yes Figure 1 Enlarged view of the Q region;
[0026] Figure 12 yes Figure 1 Another magnified view of the Q region;
[0027] Figure 13 This is a flowchart illustrating a method for fabricating a backlight module according to an embodiment of this application;
[0028] Figures 14 to 15 This is a schematic diagram of film layer changes in a backlight module fabrication method provided in this application embodiment;
[0029] Figure 16 This is a flowchart of another method for manufacturing a backlight module provided in this application embodiment;
[0030] Figures 17 to 19 This is a schematic diagram of film layer changes in a backlight module fabrication method provided in this application embodiment;
[0031] Figure 20 This is a flowchart of another method for manufacturing a backlight module provided in this application embodiment;
[0032] Figures 21 to 22 This is a schematic diagram of film layer changes in a backlight module fabrication method provided in this application embodiment;
[0033] Figure 23 This is a schematic diagram of the structure of the light conversion unit in a backlight module provided in an embodiment of this application;
[0034] Figure 24This is a schematic diagram of the structure of a display device provided in an embodiment of this application.
[0035] In the attached image:
[0036] 1-Backlight module; A1-Hole area; A2-Backlight area; A21-Main backlight area; A22-Supplemental light area; 11-Substrate; 111-Body part; 112-First through hole; 12-Light-emitting layer; 121-Light-emitting element; 1211-First light-emitting element; 1212-Second light-emitting element; 122-Color conversion film; 123-Encapsulation layer; 13-Light conversion part; 131-First surface; 132-Protrusion part; 133-Light-concentrating structure; 134-Second through hole; 14-Optical film material; 136-First layer; 135-Second layer; 2-Display device; 21-Liquid crystal layer; 22-Back shell; 23-Camera. Detailed Implementation
[0037] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description in order to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples thereof.
[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.
[0039] The inventors discovered through research that, as the screen-to-body ratio requirements for display devices increase, achieving full-screen display has become a pursuit goal in display technology. Cameras are an indispensable component of display devices. To place the camera below the aperture area, an area needs to be reserved in the display panel for light to pass through; this area is typically formed by creating a hole in the display panel. However, during display, the aperture area may appear dark, resulting in poor brightness uniformity between the aperture area of the backlight module and the normal display area. Based on research into these problems, the inventors provide a backlight module, its manufacturing method, and a display device to improve the full-screen display effect of the display panel.
[0040] To better understand this application, the following will be combined with... Figures 1 to 24 The backlight module, its manufacturing method, and display device according to the embodiments of this application will be described in detail.
[0041] Please see Figure 1 and Figure 2 This application provides a backlight module 1, including an aperture region A1 and a backlight region A2 surrounding at least a portion of the aperture region A1. The backlight module 1 includes a substrate 11, a light-emitting layer 12, and a light conversion part 13. The substrate 11 includes a body portion 111 located in the backlight region A2 and a first through hole 112 located in the aperture region A1. The light-emitting layer 12 includes a light-emitting element 121 and a color conversion film 122. Along the light emission direction x of the backlight module 1, the color conversion film 122 is located on the side of the light-emitting element 121 facing away from the substrate 11, and the light-emitting layer 12 is located in the backlight region A2 and on one side of the substrate 11. Along the light emission direction x of the backlight module 1, the light conversion unit 13 includes a second through hole 134 disposed opposite to the first through hole 112. Along the first direction y, the light conversion unit 13 is disposed on the side of the light-emitting layer 12 facing the hole area A1. Along the first direction y, the orthographic projection of the light conversion unit 13 is the first projection, and the orthographic projection of the light-emitting layer 12 is the second projection. The first projection and the second projection at least partially overlap. The light conversion unit 13 converts part of the light emitted by the light-emitting element 121 into white light. Here, the first direction y is the direction from the backlight area A2 to the hole area A1.
[0042] The backlight module 1 provided in this application includes a substrate 11, a light-emitting layer 12, and a light conversion part 13. The backlight module 1 includes an aperture area A1 and a backlight area A2. The backlight area A2 is used to emit light to provide backlight for the display panel. The substrate 11 includes a first through hole 112 and a body part 111. The body part 111 is located in the backlight area A2. The light-emitting layer 12 is located in the backlight area A2 and is located on one side of the body part 111. The light-emitting layer 12 includes a light-emitting element 121 and a color conversion film 122. The light-emitting element 121 is located on the side surface of the body part 111 facing the light-emitting surface of the backlight module 1. The color conversion film 122 is located on the side of the light-emitting element 121 away from the substrate 11. The color conversion film 122 is used to convert the light emitted by the light-emitting element 121 to provide backlight for the display panel. The light conversion unit 13 includes a second through hole 134 disposed opposite to the first through hole 112 along the light emission direction of the backlight module 1. The projections of the first through hole 112 and the second through hole 134 along the light emission direction of the backlight module 1 at least partially overlap, so that the backlight module 1 includes a light-transmitting area for providing light to the camera. Along the first direction y, the light conversion unit 13 is disposed on the side of the light-emitting layer 12 facing the aperture area A1. Along the first direction y, the orthographic projection of the light conversion unit 13 is the first projection, and the orthographic projection of the light-emitting layer 12 is the second projection. The first projection and the second projection at least partially overlap, and the light conversion unit 13 converts part of the light emitted by the light-emitting element 121 into white light. Wherein, the first direction y is the direction from the backlight area A2 to the aperture area A1. The light conversion unit 13 converts at least a portion of the light emitted from the light-emitting element 121 toward the aperture area A1 into white light. This provides supplementary lighting to the aperture area A1, reducing the brightness difference between the aperture area A1 and the backlight area A2, and improving the uniformity of backlight brightness. Furthermore, it prevents the light emitted by the light-emitting element 121 from being emitted directly without conversion, which could cause display abnormalities in the aperture area A1, such as blue light leakage, affecting the display quality of the display panel. In other words, the backlight module 1 provided in this application can improve its own backlight brightness uniformity while simultaneously addressing the problem of abnormal light emission from the aperture area A1 and improving backlight quality.
[0043] In the aforementioned backlight module 1, the orthographic projection of the color conversion film 122 onto the substrate 11 covers the orthographic projection of the light-emitting element 121 onto the substrate 11. This ensures that all light emitted by the light-emitting element 121 towards the light-emitting surface of the backlight module 1 is converted by the color conversion film 122. On one hand, this mixes the light emitted by the light-emitting element 121 to achieve planar backlighting; on the other hand, it prevents blue light leakage. The light-emitting element 121 can be a mini LED, specifically a mini LED that emits blue light. After conversion by the color conversion film 122 and the light conversion unit 13, it emits white light. That is, the light conversion unit 13 can compensate for the portion of blue light emitted by the mini LED that is directed towards the aperture region A1, converting it into white light emission.
[0044] In one feasible embodiment, the light conversion unit 13 includes a colloid and a fluorescent material mixed with the colloid.
[0045] In the above embodiment, the light conversion unit 13 includes a colloid and a fluorescent material mixed with the colloid. The colloid is used for molding and fixing the light conversion unit 13, and the fluorescent material is used to convert blue light into white light, on the one hand preventing blue light from leaking out of the aperture area A1, and on the other hand providing white supplementary light to the aperture area A1.
[0046] In one feasible implementation, the fluorescent material includes a yellow fluorescent material, or a combination of a red fluorescent material and a green fluorescent material.
[0047] In the above embodiments, the fluorescent material can be of one color or a mixture of multiple colors; this application does not impose any particular limitation, and the choice can be made according to actual needs. When using a single-color fluorescent material, yellow fluorescent material can be used, as it can convert blue light into white light. When using a mixture of multiple colors of fluorescent material, red and green fluorescent materials can be mixed to convert blue light into white light.
[0048] In one feasible implementation, such as Figure 3 As shown, along the light emission direction of the backlight module 1, the height of the light conversion section 13 is h1, and the height of the light-emitting layer 12 is h2, where h1 ≥ h2. The light conversion section 13 includes a first surface 131, which is parallel to the plane of the substrate 11 and is located on the side of the color conversion film 122 away from the substrate 11.
[0049] In the above embodiment, by setting the height of the light conversion unit 13 along the light emission direction of the backlight module 1 to be greater than the height of the light-emitting layer 12, it is convenient to increase the overlap area of the first projection and the second projection by adjusting the position of the light conversion unit 13 and the light-emitting layer 12 in the thickness direction of the backlight module 1, thereby improving the conversion efficiency of the light conversion unit 13 for the light emitted by the light-emitting element 121 toward the aperture region A1. At the same time, by making the first surface 131 of the light conversion unit 13 located on the side of the color conversion film 122 away from the substrate 11, the light emitted by the light-emitting element 121 toward the aperture region A1 that is far from the substrate 11 can be better converted by the light conversion unit 13, reducing the adverse effects of this part of the light on the aperture region A1 and converting it into beneficial supplementary light.
[0050] In one feasible implementation, h1≥h2, and the first projection covers the second projection, so that the light emitted from the light-emitting element 121 to the aperture area A1 is converted by the light conversion unit 13, thereby better improving the problem of blue light leakage caused by the light emitted from the light-emitting element 121 being directly emitted into the aperture area A1 without conversion.
[0051] In one feasible implementation, such as Figure 2 As shown, along the light emission direction of the backlight module 1, the height of the light conversion part 13 is h1, and the height of the light-emitting layer 12 is h2, h1 = h2; the light conversion part 13 is located on the side of the substrate 11 facing the light-emitting layer 12 and is in contact with the substrate 11.
[0052] In the above embodiment, h1 = h2, and the light-emitting layer 12 and the light conversion part 13 are both located on the same side of the substrate 11 and in contact with the substrate 11, so that the first projection and the second projection can overlap. That is, the color conversion film 122 and the light conversion part 13 can cooperate to achieve the effect of covering the light emitted by the light-emitting element 121, thereby further improving the problem of blue light leakage in the aperture area A1 and enhancing the supplementary light effect in the aperture area A1.
[0053] In one feasible implementation, such as Figure 3 and Figure 4 As shown, along the light emission direction of the backlight module 1, the height of the light conversion part 13 is h1, the height of the light-emitting layer 12 is h2, and h1 > h2; along the first direction y, the orthographic projection of the substrate 11 is the third projection, and the first projection and the third projection at least partially overlap.
[0054] In the above embodiment, h1 > h2, and along the first direction y, the orthographic projection of the substrate 11 is the third projection. The first projection and the third projection at least partially overlap, that is, a portion of the light conversion section 13 is located on the side of the substrate 11 facing the aperture region A1. The light conversion section 13 can convert the portion of the light emitted from the light-emitting element 121 towards the aperture region A1 that is close to the substrate 11, improving the light leakage phenomenon at the position between the light-emitting layer 12 and the substrate 11. At this time, the first surface 131 of the light conversion section 13 is located on the side of the color conversion film 122 away from the substrate 11 or is flush with the surface of the color conversion film 122 on the side away from the substrate 11; this application does not make any particular limitation. It can be ensured that the first projection covers the second projection to achieve a good anti-light leakage and aperture region A1 supplementary light effect.
[0055] In one feasible implementation, such as Figure 3 As shown, along the light emission direction of the backlight module 1, the height of the light conversion part 13 is h1, and the height of the light-emitting layer 12 is h2, where h1 > h2; the light conversion part 13 is located on the side of the substrate 11 facing the light-emitting layer 12 and is in contact with the substrate 11.
[0056] In the above embodiment, the light conversion part 13 is located on the side of the substrate 11 facing the light-emitting layer 12 and is in contact with the substrate 11. That is, the light-emitting layer 12 and the light conversion part 13 are both located on the same side of the substrate 11 and are in contact with the substrate 11, and h1>h2, that is, the first projection covers the second projection. At this time, the color conversion film 122 and the light conversion part 13 can cooperate to achieve the effect of covering the light emitted by the light-emitting element 121, thereby further improving the problem of blue light leakage in the aperture area A1 and enhancing the supplementary light effect in the aperture area A1.
[0057] In one feasible implementation, such as Figures 4 to 6 As shown, the light conversion unit 13 includes a protrusion 132, which is located at the end of the light conversion unit 13 away from the substrate 11. The protrusion 132 is parallel to the plane of the substrate 11, and the protrusion 132 and the orthogonal projection of the light-emitting layer 12 on the substrate 11 overlap.
[0058] In the above embodiment, the protrusion 132 overlaps with the color conversion film 122, thereby further reducing the probability of light escaping through the gap between them, and further improving the effect of preventing blue light leakage.
[0059] In one feasible embodiment, the light-emitting layer 12 further includes an encapsulation layer 123, which is located between the color conversion film 122 and the light-emitting element 121 and is used to encapsulate the light-emitting element 121.
[0060] The protruding portion can directly contact the color conversion film or the encapsulation layer; this application does not impose any particular limitation. Specifically, such as Figure 4 and Figure 6 As shown, the protrusion 132 is located on the side of the color conversion film 122 facing away from the substrate 11. Figure 5 As shown, the protruding portion is located on the side of the encapsulation layer 123 away from the substrate 11.
[0061] like Figure 5 and Figure 6 As shown, the end of the light conversion section 13 away from the protrusion is located on the surface of the substrate 11 facing the light-emitting surface and is in contact with the substrate 11. Alternatively, as... Figure 4As shown, the end of the light conversion section 13 away from the protrusion is located on the side of the substrate facing the hole area, which is not particularly limited in this application. Since the light conversion section 13 overlaps with the color conversion film 122, the light conversion section 13 can be configured not to contact the surface of the substrate 11 facing the light-emitting surface of the display panel. During the fabrication process, the light-emitting element 121 and the encapsulation layer 123 can be fabricated on the substrate first, and then the light conversion section 13 can be fabricated. There is no need to reserve a preset position for the light conversion section 13 on the substrate 11, so that the light conversion section 13 does not need to be aligned with the preset position when fabricating it. This simplifies the fabrication process, requiring only the addition of the step of fabricating the light conversion section 13 to the conventional fabrication process. The impact on the conventional fabrication process is small, resulting in lower fabrication costs.
[0062] In one feasible implementation, such as Figure 7 and Figure 8 As shown, the light conversion unit 13 includes a light-concentrating structure 133, which is formed on the side surface of the light conversion unit 13 away from the light-emitting layer 12, and the light-concentrating structure 133 is integrally formed with the light conversion unit 13.
[0063] In the above embodiment, a light-concentrating structure 133 is formed on the side of the light conversion unit 13 facing the second through hole 134. When the light emitted by the light-emitting element 121 is converted into white light by the light conversion unit 13 and emitted into the second through hole 134, it can be focused by the light-concentrating structure 133, thereby further improving the brightness of the hole area A1, reducing the brightness difference between the backlight area A2 and the hole area A1, and improving the uniformity of the backlight.
[0064] In the above embodiments, the light conversion part 13 can be a preform. On the one hand, the preform is formed by molding, which facilitates the formation of the light-concentrating structure 133 on the light conversion part 13, and the light-concentrating structure 133 formed by molding has high precision. On the other hand, using a preform for the light conversion part 13 allows for direct assembly to form the display panel, which helps improve the production efficiency of the display panel. Only an assembly step for the light conversion part 13 needs to be added to the conventional manufacturing process, which has little impact on the conventional manufacturing process, thus resulting in lower manufacturing costs.
[0065] In one feasible implementation, such as Figure 7 and Figure 8 As shown, the light-concentrating structure 133 includes a prism structure, the length direction of which is parallel to the thickness direction of the substrate 11; or, the light-concentrating structure 133 includes a block-shaped protrusion.
[0066] In the above embodiments, the light-concentrating structure 133 can be a strip-shaped or ring-shaped prism structure, or a block-shaped structure, such as a pyramid. When it is a strip-shaped prism structure, the length direction of the prism structure can be the height direction of the light conversion part 13. When it is a ring-shaped prism structure, the extension direction of the prism structure can be the direction surrounding the second through hole 134.
[0067] In one feasible implementation, such as Figure 7 As shown, the light conversion part 13 may be a prefabricated part, and this application does not impose any particular limitation.
[0068] In one feasible implementation, such as Figure 9 As shown, the backlight module 1 also includes an optical film 14. The optical film 14 is located on the side of the light-emitting layer 12 away from the substrate 11. The optical film 14 is used to adjust the light emitted by the light-emitting layer 12 to achieve a better backlight effect. The optical film 14 includes a third opening 141 located in the hole area A1. The projections of the third through hole 141, the second through hole 123, and the first through hole 112 in the thickness direction of the display module at least partially overlap to form a light-transmitting area.
[0069] In one feasible implementation, such as Figure 10 As shown, the light conversion unit 13 includes a first layer 136 and a second layer 135. The first layer 136 is disposed around the second through hole 134, and the second layer 135 is located on the side of the first layer 136 away from the second through hole 134. The refractive index of the first layer 136 is greater than the refractive index of the second layer 135.
[0070] In the above embodiment, both the first layer 136 and the second layer 135 are barrel-shaped and radially nested along the second through hole 134. The outer diameter of the first layer 136 is smaller than the outer diameter of the second layer 135, that is, the first layer 136 forms the second through hole 134, and the second layer 135 is located on the side of the first layer 136 away from the second through hole 134. The refractive indices of the first layer 136 and the second layer 135 are different. Specifically, the refractive index of the first layer 136 is greater than that of the second layer 135, so that the light emitted by the light-emitting element 121 can be converged after entering the second layer 135 and then the first layer 136, thereby further improving the brightness of the hole area A1, reducing the brightness difference between the backlight area A2 and the hole area A1, and improving the backlight uniformity.
[0071] In one feasible implementation, such as Figure 11 and Figure 12As shown, the backlight area A2 includes a main backlight area A21 and a supplementary light area A22. The main backlight area A21 is arranged around the aperture area A1, and the supplementary light area A22 is arranged around the aperture area A1 and located between the main backlight area A21 and the aperture area A1. The light-emitting layer 12 includes a first light-emitting element 1211 located in the main backlight area A21 and a second light-emitting element 1212 located in the supplementary light area A22. The first light-emitting element 1211 and the second light-emitting element 1212 are arranged in an array, or the first light-emitting element 1211 is arranged in an array and the second light-emitting element 1212 is arranged in a ring around the aperture area A1.
[0072] In one implementation, such as Figure 11 As shown, the backlight area A2 includes a main backlight area A21 and a supplementary light area A22. The supplementary light area A22 is located between the main backlight area A21 and the aperture area A1. The light-emitting layer 12 includes a first light-emitting element 1211 located in the main backlight area A21 and a second light-emitting element 1212 located in the supplementary light area A22. The first light-emitting element 1211 and the second light-emitting element 1212 are arranged in an array, which facilitates fabrication.
[0073] In another implementation, such as Figure 12 As shown, the first light-emitting elements 1211 are arranged in an array, and the second light-emitting elements 1212 are arranged in a ring around the aperture region A1. The arrangement of the second light-emitting elements 1212 according to the shape of the aperture region A1 can improve the brightness uniformity of the aperture region A1. The second light-emitting elements 1212 can be uniformly distributed along the aperture region A1, and the distribution density of the second light-emitting elements 1212 can be greater than the distribution density of the first light-emitting elements, thereby improving the brightness of the aperture region A1.
[0074] This application also provides a method for fabricating a backlight module 1, such as... Figure 13 As shown, the backlight module 1 includes an aperture region A1 and a backlight region A2 surrounding at least a portion of the aperture region A1. The fabrication method includes:
[0075] S100, such as Figure 14 As shown, a substrate 11 is provided. The substrate 11 includes a body portion 111 and a first through hole 112. The body portion 111 is located in the backlight area A2, and the first through hole 112 is located in the hole area A1.
[0076] S200, such as Figure 15As shown, a light-emitting layer 12 and a light-converting section 13 are formed. The light-emitting layer 12 is formed in the backlight area A2 and located on one side of the substrate 11. Along the light emission direction of the backlight module 1, a color conversion film 122 is formed on the side of the light-emitting element 121 away from the substrate 11. Along the first direction y, the light-converting section 13 is disposed on the side of the light-emitting layer 12 facing the aperture area A1. The light-converting section 13 includes a second through hole 134. Along the light emission direction of the backlight module 1, the second through hole 134 is disposed opposite to the first through hole 112. Along the first direction y, the orthographic projection of the light-converting section 13 is the first projection, and the orthographic projection of the light-emitting layer 12 is the second projection. The first projection and the second projection overlap at least partially. The light-converting section 13 converts part of the light emitted by the light-emitting element 121 into white light. The first direction y is the direction from the backlight area A2 to the aperture area A1.
[0077] In the above preparation method, a light-emitting layer 12 is formed on the substrate 11, and a light conversion section 13 is formed along the first direction y on the side of the light-emitting layer 12 facing the aperture region A1. The light conversion section 13 converts part of the light emitted by the light-emitting element 121 into white light. Along the first direction y, the orthographic projection of the light conversion section 13 is the first projection, and the orthographic projection of the light-emitting layer 12 is the second projection. The first projection and the second projection at least partially overlap. The first direction y is the direction from the backlight region A2 to the aperture region A1 on the side of the light-emitting layer 12 facing the aperture region A1. This provides supplementary light to the aperture region A1, reduces the brightness difference between the aperture region A1 and the backlight region A2, and improves the uniformity of backlight brightness. On the other hand, it prevents the light emitted by the light-emitting element 121 from being emitted directly without conversion, which could cause display abnormalities in the aperture region A1, such as blue light leakage, affecting the display quality of the display panel. In other words, the backlight module 1 provided in this application can improve its own backlight brightness uniformity, improve the problem of abnormal light emission from the aperture region A1, and improve the backlight quality.
[0078] In one feasible implementation, such as Figure 16 As shown, the light-emitting layer 12 also includes an encapsulation layer 123 located between the light-emitting element 121 and the color conversion film 122. The steps of forming the light-emitting layer 12 and the light conversion part 13 include:
[0079] S211, such as Figure 17 As shown, a light-emitting element 121 located in the backlight region A2 is formed on the substrate 11.
[0080] S212, such as Figure 18 As shown, a light conversion section 13 is formed on the substrate 11 surrounding the hole region A1.
[0081] S213, such as Figure 19 As shown, an encapsulation layer 123 is formed on the side of the light-emitting element 121 that is away from the substrate 11.
[0082] S214, as Figure 15 As shown, a color conversion film 122 is formed on the side of the encapsulation layer 123 facing away from the substrate 11.
[0083] In the above preparation method, the light-emitting element 121 is formed first, then the light conversion part 13 is formed, and then the encapsulation layer 123 is formed. The material of the encapsulation layer 123 can be a transparent adhesive, so that the light-emitting element 121 can be encapsulated by the encapsulation layer 123, and the light conversion part 13 can be bonded and fixed, thereby saving the step of fixing the light conversion layer.
[0084] In one feasible implementation, such as Figure 20 As shown, the light-emitting layer 12 also includes an encapsulation layer 123 located between the light-emitting element 121 and the color conversion film 122. The steps of forming the light-emitting layer 12 and the light conversion part 13 include:
[0085] S221, as Figure 21 As shown, a light-emitting element 121 located in the backlight region A2 and an encapsulation layer 123 located on the side of the light-emitting element 121 away from the substrate 11 are formed on the substrate 11, and the encapsulation layer 123 encapsulates the light-emitting element 121.
[0086] S222, as Figure 22 As shown, a light conversion section 13 is formed on the side of the encapsulation layer 123 away from the substrate 11, on the side of the encapsulation layer 123 facing the hole area A1, and on the side of the substrate 11 facing the first through hole 112.
[0087] S223, such as Figure 15 As shown, a color conversion film 122 is formed on the side of the encapsulation layer 123 opposite to the body portion 111.
[0088] In the above implementation, the positions of steps S222 and S223 can be interchanged.
[0089] When step S222 is performed first and then step S223, the light-emitting element 121 and the encapsulation layer 123 are prepared sequentially, then the light conversion part 13 is prepared, and finally the color conversion film 122 is prepared. The light conversion part 13 can be prepared as a structure that partially covers the surface of the encapsulation layer 123 away from the substrate 11. The light conversion part 13 overlaps and is fixed with the encapsulation layer 123.
[0090] When step S223 is performed before step S222, that is, the light-emitting element 121 and the encapsulation layer 123 are prepared sequentially, then the color conversion film 122 is prepared, and finally the light conversion part 13 is prepared. The light conversion part 13 can be prepared as a structure that partially covers the surface of the color conversion film 122 away from the substrate 11, so that the color conversion film 122 and the light conversion part 13 can overlap to reduce the probability of light leakage from the area between them.
[0091] In one feasible implementation, the light conversion section 13 is formed by a coating process.
[0092] Since the light conversion part 13 includes a colloid and a fluorescent material mixed with the colloid, the colloid doped with the fluorescent material can be directly coated and cured to form the light conversion part 13. The preparation process is simple, and the structure can be adjusted according to the actual backlight module 1 structure.
[0093] In another feasible embodiment, the light conversion part 13 is formed by mounting a preform of the light conversion part 13 to the side of the light-emitting layer 12 facing the hole area A1. The preform includes a second through hole 134 and a light-concentrating structure 133. The light-concentrating structure 133 is formed on the side surface of the preform facing the second through hole 134 and is integrally formed with the preform.
[0094] In the above embodiments, such as Figure 23 As shown, the light conversion part 13 is a preform. During the preparation of the backlight module 1, the preform can be directly installed into the hole area A1. The preparation process is convenient, and the light-concentrating structure 133 can be prepared according to the actual light requirements. The preform can be prepared by mold, which facilitates the formation of the light-concentrating structure 133.
[0095] This application also provides a display device 2, such as... Figure 24 As shown, it includes any one of the backlight modules 1 provided in the above embodiments of this application.
[0096] Since the display device 2 provided in this application includes any of the backlight modules 1 provided in the above embodiments, the display device 2 provided in this application has the beneficial effects of any of the backlight modules 1 provided in the above embodiments, which will not be repeated here.
[0097] The display device 2 in this application embodiment includes, but is not limited to, mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, control consoles, and other devices with display functions.
[0098] In one feasible embodiment, the display device 2 further includes a liquid crystal layer 21 disposed on the side of the backlight module 1 facing the light-emitting surface. The orthographic projection of the liquid crystal layer in the thickness direction of the backlight module 1 covers the backlight module 1. The display device also includes a back shell 22 on the side of the substrate 11 in the backlight module facing away from the light-emitting surface and a camera 23 disposed opposite to the aperture area.
[0099] The display device 2 includes a first display area disposed opposite to the backlight area A2 of the backlight module 1 and a second display area disposed opposite to the hole area A1 of the backlight module 1. The brightness difference between the first display area and the second display area is small, and the brightness uniformity of the display device 2 is high, which helps to improve the user experience.
[0100] The embodiments described above are not exhaustive and do not limit the invention to specific examples. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to effectively utilize this application and its modifications. This application is limited only by the claims and their full scope and equivalents.
Claims
1. A backlight module, characterized in that, The backlight module includes an aperture area and a backlight area surrounding at least a portion of the aperture area. The substrate includes a body portion located in the backlight region and a first through hole located in the hole region; The light-emitting layer includes a light-emitting element and a color conversion film. Along the light emission direction of the backlight module, the color conversion film is located on the side of the light-emitting element away from the substrate, and the light-emitting layer is located in the backlight area and on one side of the substrate. The light conversion unit, along the light emission direction of the backlight module, includes a second through hole disposed opposite to the first through hole. Along the first direction, the light conversion unit is disposed on the side of the light-emitting layer facing the hole area. Along the first direction, the orthographic projection of the light conversion unit is a first projection, and the orthographic projection of the light-emitting layer is a second projection. The first projection and the second projection at least partially overlap. The light conversion unit converts part of the light emitted by the light-emitting element into white light. The first direction is the direction from which the backlight area points to the hole area.
2. The backlight module according to claim 1, characterized in that, Along the light emission direction of the backlight module, the height of the light conversion part is h1, the height of the light-emitting layer is h2, and h1≥h2; The light conversion section includes a first surface, which is parallel to the plane of the substrate and is located on the side of the color conversion film away from the substrate.
3. The backlight module according to claim 2, characterized in that, Along the light emission direction of the backlight module, the height of the light conversion part is h1, and the height of the light-emitting layer is h2, where h1 = h2; The light conversion unit is located on the side of the substrate facing the light-emitting layer and is in contact with the substrate.
4. The backlight module according to claim 2, characterized in that, Along the light emission direction of the backlight module, the height of the light conversion part is h1, and the height of the light-emitting layer is h2, where h1 > h2; Along the first direction, the orthographic projection of the substrate is a third projection, and the first projection and the third projection at least partially overlap; Alternatively, the light conversion section is located on the side of the substrate facing the light-emitting layer and is in contact with the substrate.
5. The backlight module according to claim 1, characterized in that, The light conversion part includes a protrusion located at the end of the light conversion part away from the substrate. The protrusion is parallel to the plane of the substrate, and the protrusion and the orthogonal projection portion of the light-emitting layer on the substrate overlap.
6. The backlight module according to claim 1, characterized in that, The light conversion part includes a light-focusing structure, which is formed on the side surface of the light conversion part away from the light-emitting layer, and the light-focusing structure is integrally formed with the light conversion part.
7. The backlight module according to claim 6, characterized in that, The light-concentrating structure includes a prism structure, the length direction of which is parallel to the thickness direction of the substrate; or, The light-concentrating structure includes block-shaped protrusions.
8. The backlight module according to claim 6, characterized in that, The light conversion unit includes a first layer and a second layer. The first layer is disposed around the second through hole, and the second layer is located on the side of the first layer away from the second through hole. The refractive index of the first layer is greater than that of the second layer.
9. The backlight module according to claim 1, characterized in that, The light conversion unit includes a colloid and a fluorescent material mixed with the colloid.
10. The backlight module according to claim 9, characterized in that, The fluorescent material includes yellow fluorescent material, or red fluorescent material and green fluorescent material.
11. The backlight module according to claim 1, characterized in that, The backlight area includes a main backlight area and a supplementary light area. The main backlight area is arranged around the aperture area, and the supplementary light area is arranged around the aperture area and located between the main backlight area and the aperture area. The light-emitting layer includes a first light-emitting element located in the main backlight area and a second light-emitting element located in the supplementary light area. The first light-emitting element and the second light-emitting element are arranged in an array, or the first light-emitting element is arranged in an array and the second light-emitting element is arranged in a ring around the aperture area.
12. A method for manufacturing a backlight module, the backlight module comprising an aperture region and a backlight region surrounding at least a portion of the aperture region, characterized in that, The preparation method includes: A substrate is provided, the substrate including a body portion and a first through hole, the body portion being located in the backlight area, and the first through hole being located in the hole area; A light-emitting layer and a light-converting section are formed. The light-emitting layer is formed in the backlight area and located on one side of the substrate. Along the light emission direction of the backlight module, a color conversion film is formed on the side of the light-emitting element away from the substrate. Along a first direction, the light-converting section is disposed on the side of the light-emitting layer facing the aperture area. The light-converting section includes a second through-hole. Along the light emission direction of the backlight module, the second through-hole is disposed opposite to the first through-hole. Along the first direction, the orthographic projection of the light-converting section is a first projection, and the orthographic projection of the light-emitting layer is a second projection. The first projection and the second projection at least partially overlap. The light-converting section converts part of the light emitted by the light-emitting element into white light. The first direction is the direction from the backlight area to the aperture area.
13. The preparation method according to claim 12, characterized in that, The light-emitting layer further includes an encapsulation layer located between the light-emitting element and the color conversion film, and the step of forming the light-emitting layer and the light conversion part includes: A light-emitting element located in the backlight area is formed on the substrate; A light conversion section is formed on the substrate surrounding the hole region; An encapsulation layer is formed on the side of the light-emitting element that is away from the substrate; A color conversion film is formed on the side of the encapsulation layer opposite to the substrate.
14. The preparation method according to claim 12, characterized in that, The light-emitting layer further includes an encapsulation layer located between the light-emitting element and the color conversion film, and the step of forming the light-emitting layer and the light conversion part includes: A light-emitting element located in the backlight area and an encapsulation layer located on the side of the light-emitting element away from the substrate are formed on the substrate, and the encapsulation layer encapsulates the light-emitting element; A light conversion section is formed on the side of the encapsulation layer away from the substrate, on the side of the encapsulation layer facing the hole area, and on the side of the substrate facing the first through hole; A color conversion film is formed on the side of the encapsulation layer opposite to the body portion.
15. The preparation method according to claim 12, characterized in that, The light conversion part is formed by a coating process; or, the light conversion part is formed by mounting a preform of the light conversion part onto the side of the light-emitting layer facing the hole area. The preform includes a second through hole and a light-concentrating structure. The light-concentrating structure is formed on the surface of the preform facing the second through hole and is integrally formed with the preform. The preform includes a barrel shape and a barrel shape with edges.
16. A display device, characterized in that, Includes the backlight module as described in any one of claims 1-11.