Backlight module and display device

Abstract

Provided are a backlight module (100) and a display device. The backlight module (100) comprises a back plate (110), a blue surface light source (120), an optical film layer (130) and an adhesive frame (140), wherein the back plate (110) is provided with an accommodating space (113), the adhesive frame (140) is arranged in the accommodating space (113) of the back plate (110), and the blue surface light source (120) is located in the adhesive frame (140); the optical film layer (130) is located in the adhesive frame (140) and located above the blue surface light source (120); and a quantum dot layer (150) is provided on the side of the adhesive frame (140) facing the blue surface light source (120).

Description

Backlight module and display device

[0001] This application claims priority to Chinese patent application No. 202311684464.4 filed on December 7, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of display technology, and in particular relates to a backlight module and a display device. Background Art

[0003] Quantum dot materials, with their high color purity and continuously tunable spectrum, can significantly enhance the display quality of display panels, and are therefore widely used in display technology. In related technologies, blue LED (Light-Emitting Diode) backlight modules rely on a QD (Quantum Dot) film layer to convert blue light into white light. However, this can cause blue light to leak out from the edges of the blue surface light source, resulting in a bluish cast around the edges of the blue LED backlight module, affecting the quality of the image. SUMMARY OF THE INVENTION

[0004] The embodiments of the present application provide a backlight module and a display device to solve the problem of bluish tint around the periphery of the existing blue LED backlight module.

[0005] In a first aspect, an embodiment of the present application provides a backlight module, comprising:

[0006] a back panel having a receiving space;

[0007] A plastic frame is arranged in the accommodation space of the back plate;

[0008] A blue surface light source is disposed in the accommodation space; and

[0009] An optical film layer is located in the plastic frame and above the blue surface light source;

[0010] Wherein, a quantum dot layer is provided on the side of the plastic frame facing the blue surface light source.

[0011] In a second aspect, an embodiment of the present application further provides a display device, comprising: a backlight module as described in any one of the above. Beneficial effects

[0012] The embodiments of the present application provide a backlight module and a display device, wherein the backlight module includes a back panel, a blue surface light source, an optical film layer, and a plastic frame. The blue surface light source, the optical film layer, and the plastic frame are all arranged inside the back panel. The blue light emitted by the blue surface light source near the edge of the blue surface light source is irradiated onto the plastic frame. The blue light is converted into white light by the quantum dot layer on the plastic frame and then emitted. This overcomes the problem of bluish light around the existing blue light LED backlight module and improves the picture display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0014] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0015] FIG1 is a cross-sectional view of a first form of a backlight module provided in an embodiment of the present application.

[0016] FIG2 is a cross-sectional view of a second form of a backlight module provided in an embodiment of the present application.

[0017] FIG3 is a top view of a blue surface light source in the second form of the backlight module provided in an embodiment of the present application.

[0018] FIG4 is a cross-sectional view of a third form of a backlight module provided in an embodiment of the present application.

[0019] FIG5 is a cross-sectional view of a fourth form of a backlight module provided in an embodiment of the present application.

[0020] FIG6 is a cross-sectional view of a fifth form of a backlight module provided in an embodiment of the present application.

[0021] FIG7 is a top view of a blue surface light source in a backlight module provided in an embodiment of the present application. Modes for Carrying Out the Invention

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0023] Some embodiments of the present application provide a backlight module, including:

[0024] a back panel having a receiving space;

[0025] A plastic frame is arranged in the accommodation space of the back plate;

[0026] A blue surface light source is disposed in the accommodation space; and

[0027] An optical film layer is located in the plastic frame and above the blue surface light source;

[0028] Wherein, a quantum dot layer is provided on the side of the plastic frame facing the blue surface light source.

[0029] In some embodiments of the present application, the plastic frame and the quantum dot layer are integrally formed by two-color injection molding.

[0030] In some embodiments of the present application, the total thickness of the plastic frame and the quantum dot layer is D, and the thickness of the quantum dot layer is d, wherein 0.6 mm ≤ D ≤ 0.7 mm, and 0.1 mm ≤ d ≤ 0.2 mm.

[0031] In some embodiments, the plastic frame comprises a white polycarbonate material or an acrylic resin material;

[0032] The quantum dot layer includes quantum dot material and glue.

[0033] In some embodiments, the quantum dot layer is attached to a side surface of the plastic frame close to the blue surface light source and the optical film layer.

[0034] In some embodiments, along the thickness direction of the blue surface light source, the cross-sectional shape of the side of the plastic frame is rectangular.

[0035] In some embodiments, the blue surface light source includes a driving substrate and an LED device, the LED device includes a plurality of first LED chips and a plurality of second LED chips, the first LED chips are arranged in a circle near the edge of the driving substrate, the second LED chips are arranged on the driving substrate, the first LED chip is closer to the edge of the driving substrate than the second LED chip, and the emission angle of the first LED chip is smaller than the emission angle of the second LED chip.

[0036] In some embodiments, the emission angle of the first LED chip is α, where 0 < α < 90°;

[0037] And / or, the emission angle of the second LED chip is β, wherein 140°≤β≤155°.

[0038] In some embodiments, the side surface of the optical film layer is closer to the plastic frame than the side surface of the blue surface light source.

[0039] Some embodiments of the present application further provide a display device comprising the backlight module described in any of the above embodiments.

[0040] The present invention provides a backlight module 100 and a display device to solve the problem of blue light around the periphery of existing blue Mini-LED (Mini-Light-Emitting Diode, submillimeter light-emitting diode) backlight modules. The following will describe the invention with reference to the accompanying drawings.

[0041] Referring to Figures 1, 2, 3, 4, 5 and 6, Figure 1 is a cross-sectional view of the first form of the backlight module provided in an embodiment of the present application, Figure 2 is a cross-sectional view of the second form of the backlight module provided in an embodiment of the present application, Figure 3 is a top view of the blue surface light source in the second form of the backlight module provided in an embodiment of the present application, Figure 4 is a cross-sectional view of the third form of the backlight module provided in an embodiment of the present application, Figure 5 is a cross-sectional view of the fourth form of the backlight module provided in an embodiment of the present application, and Figure 6 is a cross-sectional view of the fifth form of the backlight module provided in an embodiment of the present application.

[0042] The embodiment of the present application provides a backlight module 100 , which includes a backplate 110 , a blue surface light source 120 , an optical film layer 130 and a plastic frame 140 .

[0043] In this embodiment, the back plate 110 is made of a metal material, such as aluminum. The back plate 110 is formed in one piece by stamping, which improves the support effect and simplifies the processing. As shown in Figure 1, the back plate 110 includes a bottom plate 111 and side plates 112. The bottom plate 111 and the side plates 112 enclose a receiving space 113. The back plate 110 has a mounting surface 114. The mounting surface 114 is located on one side of the bottom plate 111 and is located within the receiving space 113.

[0044] In this embodiment, as shown in FIG1 , the blue surface light source 120 includes a driving substrate 122 and an LED device 121. The driving substrate 122 is installed in the back panel 110. The driving substrate 122 can be one of a printed circuit board, a glass substrate, or a polyimide substrate. When the driving substrate 122 is a glass substrate, since the glass substrate has a high flatness, a driving circuit is made on the glass substrate to drive the LED device 121, which can realize an active driving scheme, thereby reducing the overall volume of the driving circuit and better reducing the power consumption of the driving circuit. One side of the driving substrate 122 is in contact with the mounting surface 114, and a plurality of LED devices 121 are set on the other side of the driving substrate 122. The LED devices 121 can be Mini-LED devices, which can provide higher resolution and thus improve the luminous effect. The plurality of LED devices 121 are arranged in a matrix on the driving substrate 122. The LED devices 121 emit blue light. The LED devices 121 are electrically connected to the driving substrate 122, and the driving substrate 122 drives the LED devices 121.

[0045] In this embodiment, as shown in Figure 1, the optical film layer 130 includes a light conversion layer 131, which is arranged on the blue surface light source 120. The light conversion layer 131 is located on the light output side of the blue surface light source 120. The light conversion layer 131 is a quantum dot conversion layer. The quantum dot conversion layer includes red light quantum dots and green light quantum dots. The red light quantum dots and the green light quantum dots emit red and green respectively under the excitation of blue light. The excited red and green are mixed with the blue light emitted by the blue surface light source 120 into white light, which can be used as a backlight source for the display panel.

[0046] In addition, as shown in Figure 1, the optical film layer 130 also includes a dichroic film 132 and a light-enhancing film 133. The dichroic film 132 is arranged on the side of the light conversion layer 131 away from the blue surface light source 120, and the light-enhancing film 133 is arranged on the side of the dichroic film 132 away from the light conversion layer 131. The dichroic film 132 is an optical film that can better realize the diffusion of light. The dichroic film 132 can be set in multiple layers and stacked to further improve the diffusion of light. The light-enhancing film 133 controls the light again to increase the brightness. The light-enhancing film 133 includes a multifunctional prism sheet.

[0047] In this embodiment, the plastic frame 140 is a rectangular frame structure. The plastic frame 140 is arranged in the back panel 110. The plastic frame 140 has an upper end face, a lower end face, an outer side face and an inner side face. The lower end face of the plastic frame 140 is in contact with the mounting surface 114 of the bottom plate 111 of the back panel 110, and the outer side face of the plastic frame 140 is in contact with the side plate 112 of the back panel 110. The blue surface light source 120 and the optical film layer 130 are located in the plastic frame 140. There is a certain distance between the side edges of the blue surface light source 120 and the optical film layer 130 and the inner side face of the plastic frame 140. The inner side face of the plastic frame 140 is provided with a quantum dot layer 150.

[0048] It can be understood that part of the blue light emitted by the blue surface light source 120 does not pass through the optical film layer 130 and is directly emitted onto the plastic frame 140. By setting a quantum dot layer 150 on the inner side surface of the plastic frame 140, the blue light that does not pass through the optical film layer 130 is converted into white light by the quantum dot layer 150 and then reflected by the plastic frame 140, thereby solving the problem of blue light around the blue light LED backlight module and improving the picture display effect.

[0049] In some embodiments, as shown in FIG. 6 , the side surface of the optical film layer 130 is closer to the plastic frame 140 than the side surface of the blue surface light source 120 .

[0050] It can be understood that the area of ​​the optical film layer 130 is larger than the area of ​​the blue surface light source 120. The blue light at the edge of the blue surface light source 120 is incident on the optical film layer 130, and this part of the blue light is converted into white light by the optical film layer 130, further reducing the blue color around the display panel.

[0051] In other embodiments, as shown in FIG. 1 , the side surface of the optical film layer 130 and the side surface of the blue surface light source 120 are in the same plane, and the area of ​​the optical film layer 130 is the same as the area of ​​the blue surface light source 120 .

[0052] In some embodiments, as shown in FIG1 , the plastic frame 140 and the quantum dot layer 150 are integrally molded using two-color injection molding. The use of two-color injection molding technology to support the plastic frame 140 and the quantum dot layer 150 allows the plastic frame 140 and the quantum dot layer 150 to be integrally formed from different materials. This simplifies the manufacturing process, ensures the flatness of the quantum dot layer 150, and improves the light conversion efficiency of the quantum dot layer 150. The integral molding of the plastic frame 140 and the quantum dot layer 150 not only fulfills the plastic frame 140's function of supporting and reflecting light, but also performs the function of converting blue light into white light, thereby enhancing the performance of the plastic frame 140.

[0053] In the above embodiment, as shown in Figure 1, the total thickness of the rubber frame 140 and the quantum dot layer 150 is D, 0.6mm≤D≤0.7mm, and the value of D can be 0.6mm, 0.65mm or 0.7mm, wherein the thickness of the quantum dot layer 150 is d, 0.1mm≤d≤0.2mm, and the value of d can be 0.1mm, 0.15mm or 0.2mm.

[0054] In this embodiment, the thickness of the integrally formed rubber frame 140 and the quantum dot layer 150 is the same as the thickness of the rubber frame in the related art. The thickness of the rubber frame 140 is thinned, and the thickness of the quantum dot layer 150 is thinned. The quantum dot layer 150 does not occupy the limited space in the back panel 110, and the space design is reasonable.

[0055] In the above embodiment, the plastic frame 140 comprises a white polycarbonate material or an acrylic resin material. The plastic frame 140 is designed to be white so as to reflect a certain amount of light while preventing excessive light from being reflected, which would cause the display panel to be bright.

[0056] As a variation, the plastic frame 140 may also be made of black or gray polycarbonate material or acrylic resin material.

[0057] In some embodiments, the glue frame 140 includes quantum dot material and glue, the quantum dot material includes red light quantum dots and green light quantum dots, and the red light quantum dots and green light quantum dots are evenly distributed in the glue.

[0058] In some embodiments, as shown in Figures 4 and 5 , the quantum dot layer 150 is attached to the plastic frame 140 and fixed to the inner side of the plastic frame 140 by a glue needle. As shown in Figure 4 , the entire inner side of the plastic frame 140 is covered with the quantum dot layer 150. As shown in Figure 5 , the quantum dot layer 150 may also be partially covered, for example, on the side of the inner side of the plastic frame 140 near the lower end face. This can also achieve the purpose of eliminating blue light by placing the quantum dot layer 150 in an area where blue light is concentrated, while also reducing the amount of quantum dot layer 150 used and lowering costs.

[0059] In some embodiments, along the thickness direction of the blue surface light source 120 , the cross-sectional shape of the side of the plastic frame 140 is rectangular.

[0060] It is understandable that the inner side surface of the plastic frame 140 is designed to have a planar structure, which facilitates the molding of the quantum dot layer 150 and the plastic frame 140 through a two-color injection molding process, and is also conducive to the quantum dot layer 150 being attached to the inner side surface of the plastic frame 140, ensuring the flatness of the quantum dot layer 150 and improving the performance of the quantum dot layer 150. In some embodiments, referring to Figures 2 and 3, the LED device 121 includes a plurality of first LED chips 123 and a plurality of second LED chips 124. The first LED chips 123 and the second LED chips 124 are arranged in an array along a first direction X and a second direction Y. The first LED chips 123 are arranged in a circle near the edge of the driving substrate 122, and the second LED chips 124 are arranged on the driving substrate 122. The first LED chips 123 are closer to the edge of the driving substrate 122 than the second LED chips 124. The emission angle of the first LED chip 123 is smaller than the emission angle of the second LED chip 124. The emission angle refers to the light emission angle of the LED chip, that is, its light scattering angle, which can be understood as the light emission range of the LED chip.

[0061] It can be understood that part of the light emitted by the first LED chip 123 diverges toward the side of the plastic frame 140. The first LED chip 123 is selected to have a chip with a smaller divergence angle, so that less light is irradiated to the plastic frame 140, and light is collected at the edge of the blue surface light source 120. A small amount of blue light is converted into white light through the quantum dot layer 150, further solving the problem of blue light around the display panel, and at the same time avoiding the problem of bright light around the display panel, thereby improving the display effect.

[0062] Based on the above embodiment, the emission angle of the first LED chip 123 is α, wherein 0<α<90°, wherein α can be 10°, 20°, 30°, 50°, 60°70°, 80° or other unspecified values. The emission angle of the first LED chip 123 is reasonably designed to meet the light collection requirements while avoiding affecting the display effect.

[0063] Based on the above embodiment, the emission angle of the second LED chip is β, where 140°≤β≤155°. β can be 140°, 145°, 150°, 155°, or other unspecified values. The emission angle of the second LED chip is reasonably set to meet the display requirements of the display panel.

[0064] In some embodiments, as shown in Figure 7, the LED device 121 includes a plurality of first LED chips 123 and a plurality of second LED chips 124, and the first LED chips 123 and the second LED chips 124 are arranged in an array along the first direction X axis and the second direction Y. The first LED chips 123 are arranged in a circle near the edge of the driving substrate 122, and the second LED chips 124 are arranged on the driving substrate 122. The first LED chip 123 is closer to the edge of the driving substrate 122 than the second LED chip 124. The distance between the first LED chip 123 and the edge of the driving substrate 122 is L1, and the distance between the first LED chip 123 and the second LED chip 124 connected to it is L2, where L1>L2.

[0065] It can be understood that in this embodiment, the distance between the first LED chip 123 and the edge of the driving substrate 122 is increased, and the light emitted by the first LED chip 123 is converted into white light through the upper optical film layer 130 as much as possible, and emitted from the front of the display panel, reducing the amount of blue light directed to the plastic frame 140, thereby solving the problem of blue light around the LED backlight module and improving the picture quality.

[0066] Referring to Figures 1 to 6, an embodiment of the present application also provides a display device, which includes the backlight module 100, the shading layer 200 and the display panel 300 described in any one of the above items, the shading layer 200 is arranged on the upper end surface of the plastic frame 140, and extends to above the partial area of ​​the side of the optical film layer 130 away from the blue surface light source 120, the display panel 300 is arranged on the plastic frame 140, and the shading layer 200 is located between the display panel 300 and the upper end surface of the plastic frame 140.

[0067] As will be appreciated, there is a gap between the side of the plastic frame 140 and the optical film layer 130. The light-shielding layer 200 can reduce light leakage in this area. The light-shielding layer 200 can be a double-sided light-shielding tape that not only blocks light but also bonds the display panel 300, plastic frame 140, and optical film layer 130 together, preventing them from sliding and improving the stability of the display device.

[0068] In the embodiment of the present application, the display panel 300 is a liquid crystal display panel, which includes an upper substrate, a lower substrate, a liquid crystal layer, a color filter layer, a touch layer and other structures. The structure of the display panel 300 is the existing technology.

[0069] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0070] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features.

[0071] The backlight module and display device provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A backlight module, wherein: include: A back panel having a receiving space; A plastic frame, arranged in the accommodation space of the back plate; A blue surface light source is arranged in the accommodation space; as well as, An optical film layer, located in the plastic frame and above the blue surface light source; Wherein, a quantum dot layer is arranged on the side of the plastic frame facing the blue surface light source.

2. The backlight module according to claim 1, wherein: The glue frame and the quantum dot layer are integrally formed.

3. The backlight module according to claim 1, wherein: The total thickness of the rubber frame and the quantum dot layer is D, and the thickness of the quantum dot layer is d, wherein 0.6 mm≤D≤0.7 mm, and 0.1 mm≤d≤0.2 mm.

4. The backlight module according to claim 1, wherein: The plastic frame comprises white polycarbonate material or acrylic resin material; The quantum dot layer includes quantum dot material and glue.

5. The backlight module according to claim 1, wherein: The quantum dot layer is attached to a side surface of the plastic frame close to the blue surface light source and the optical film layer.

6. The backlight module according to claim 1, wherein: Along the thickness direction of the blue surface light source, the cross-sectional shape of the side of the rubber frame is a rectangle.

7. The backlight module according to claim 1, wherein: The blue surface light source includes a driving substrate and an LED device, the LED device includes a plurality of first LED chips and a plurality of second LED chips, the first LED chips are arranged in a circle near the edge of the driving substrate, the second LED chips are arranged on the driving substrate, the first LED chip is closer to the edge of the driving substrate than the second LED chip, and the emission angle of the first LED chip is smaller than the emission angle of the second LED chip.

8. The backlight module according to claim 7, wherein: The emission angle of the first LED chip is α, wherein 0<α<90°; And / or, the emission angle of the second LED chip is β, wherein 140°≤β≤155°.

9. The backlight module according to claim 1, wherein: The side surface of the optical film layer is closer to the plastic frame than the side surface of the blue surface light source.

10. The backlight module according to claim 1, wherein: The back plate includes a bottom plate and a side plate, the bottom plate and the side plate enclose the accommodation space, and the back plate is further provided with a mounting surface, the mounting surface is located on one side of the bottom plate and in the accommodation space; The lower end surface of the rubber frame is fitted with the mounting surface, the outer side surface of the rubber frame is fitted with the side plate of the back plate, the blue surface light source and the optical film layer are located in the rubber frame, and the quantum dot layer is arranged on the inner side surface of the rubber frame.

11. A display device, comprising a backlight module, wherein the backlight module comprises: A back panel having a receiving space; A plastic frame, arranged in the accommodation space of the back plate; A blue surface light source is arranged in the accommodation space; as well as, An optical film layer, located in the plastic frame and above the blue surface light source; Wherein, a quantum dot layer is arranged on the side of the plastic frame facing the blue surface light source.

12. The display device according to claim 11, wherein: The glue frame and the quantum dot layer are integrally formed.

13. The display device according to claim 11, wherein: The total thickness of the rubber frame and the quantum dot layer is D, and the thickness of the quantum dot layer is d, wherein 0.6 mm≤D≤0.7 mm, and 0.1 mm≤d≤0.2 mm.

14. The display device according to claim 11, wherein: The plastic frame comprises white polycarbonate material or acrylic resin material; The quantum dot layer includes quantum dot material and glue.

15. The display device according to claim 11, wherein: The quantum dot layer is attached to a side surface of the plastic frame close to the blue surface light source and the optical film layer.

16. The display device according to claim 11, wherein: Along the thickness direction of the blue surface light source, the cross-sectional shape of the side of the rubber frame is a rectangle.

17. The display device according to claim 11, wherein: The blue surface light source includes a driving substrate and an LED device, the LED device includes a plurality of first LED chips and a plurality of second LED chips, the first LED chips are arranged in a circle near the edge of the driving substrate, the second LED chips are arranged on the driving substrate, the first LED chip is closer to the edge of the driving substrate than the second LED chip, and the emission angle of the first LED chip is smaller than the emission angle of the second LED chip.

18. The display device according to claim 17, wherein: The emission angle of the first LED chip is α, wherein 0<α<90°; And / or, the emission angle of the second LED chip is β, wherein 140°≤β≤155°.

19. The display device according to claim 11, wherein: The side surface of the optical film layer is closer to the plastic frame than the side surface of the blue surface light source.

20. The display device according to claim 11, wherein: The back plate includes a bottom plate and a side plate, the bottom plate and the side plate enclose the accommodation space, and the back plate is further provided with a mounting surface, the mounting surface is located on one side of the bottom plate and in the accommodation space; The lower end surface of the rubber frame is fitted with the mounting surface, the outer side surface of the rubber frame is fitted with the side plate of the back plate, the blue surface light source and the optical film layer are located in the rubber frame, and the quantum dot layer is arranged on the inner side surface of the rubber frame.

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