Backboard assembly, backlight module, display module and display equipment

Abstract

The utility model relates to the technical field of backlight module structures, in particular to a back plate assembly, a backlight module, a display module and display equipment, the back plate assembly comprises a back plate, a light-emitting device and a reflecting layer, the back plate is provided with a mounting surface, the reflecting layer is coated on the mounting surface of the back plate, and the light-emitting device is arranged on the reflecting layer; wherein the reflecting layer comprises reflective ink and quantum dots. The utility model mainly aims to provide a back plate assembly, and aims to reduce module assembly procedures and improve production efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to backlight module structure technical field, especially backlight module, display module and display device. BACKGROUND

[0002] The backlight module in the direct type display screen is the key assembly of realizing uniform illumination. It is usually composed of light emitting device, light guide plate, reflecting sheet, diffusion sheet, light enhancement sheet and the like. In the direct type backlight module, the light emitting device is directly placed on the back plate, and the point light emitting device or line light emitting device is converted into surface light emitting device through the light guide plate, so that the light is uniformly distributed. The reflecting sheet is used for reflecting the light leaked from the bottom back to the light guide plate for reuse, so as to increase the use efficiency of light.

[0003] In the assembly process of the backlight module, the reflecting sheet usually needs to be assembled manually due to its soft material characteristics. This manual assembly method limits the production efficiency, because it is difficult for the automatic equipment to handle the accurate positioning and assembly of the soft material. This not only increases the labor cost, but also limits the production speed, affecting the efficiency of the whole backlight module manufacturing process. SUMMARY

[0004] The main purpose of the utility model is to provide a back plate assembly, which aims to reduce the module assembly process and improve the production efficiency.

[0005] To achieve the above purpose, the back plate assembly provided by the utility model comprises a back plate, a light emitting device and a reflecting layer, the back plate has a mounting surface, the reflecting layer is coated on the mounting surface of the back plate, and the light emitting device is arranged on the reflecting layer. The reflecting layer comprises reflecting ink and quantum dots.

[0006] The utility model provides a backlight module, which comprises a light guide plate and the back plate assembly, the light guide plate is fixedly connected with the back plate assembly, and the light incident surface of the light guide plate faces the reflecting layer.

[0007] The utility model provides a display module, which comprises a display screen and the backlight module, the display screen is connected with the backlight module, and the light emitting surface of the light guide plate faces the display screen.

[0008] The utility model provides a display device, which comprises the display module. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0010] Figure 1 The overall schematic diagram of an embodiment of the back plate assembly provided by the present application is shown in the figure.

[0011] Figure 2 The top view of the back plate assembly provided by the present application is shown in the figure. Figure 1 The top view of the back plate assembly provided by the present application is shown in the figure.

[0012] Figure 3 The structural schematic diagram of an embodiment of the reflective layer provided by the present application is shown in the figure.

[0013] Figure 4 The structural schematic diagram of another embodiment of the reflective layer provided by the present application is shown in the figure.

[0014] Figure 5 The structural schematic diagram of another embodiment of the reflective layer provided by the present application is shown in the figure.

[0015] Figure 6 The three-dimensional structural diagram of an embodiment of the backlight module provided by the present application is shown in the figure.

[0016] Explanation of the reference signs:

[0017] 10, back plate; 20, light emitting device; 30, reflective layer; 31, reflective ink layer; 311, reflective ink sub-layer; 32, quantum dot layer; 321, quantum dot sub-layer; 301, first area; 302, second area; 10a, center mounting area; 10b, edge area.

[0018] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0020] It should be noted that if the embodiments of the utility model have directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture, if the specific posture changes, the directionality indication also changes accordingly.

[0021] In addition, if the embodiments of the utility model have descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled persons in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the utility model.

[0022] The back plate assembly provided by the utility model, please refer to Figure 1 , including back plate 10, light emitting device 20 and reflective layer 30, back plate 10 has installation surface, light emitting device 20 is fixedly arranged on the installation surface of back plate 10, reflective layer 30 is coated on the installation surface of back plate 10, and the light emitting device 20 is arranged on the reflective layer 30;Wherein, the reflective layer includes reflective ink and quantum dots.

[0023] The back plate assembly provided by the utility model is applied to direct type display screen, and the direct type display screen refers to a kind of LCD display screen design, wherein light emitting device 20 is arranged inside back plate 10, light emitting device 20 is usually arranged in matrix on back plate 10, to be evenly distributed on back plate 10, so that light is as dispersed as evenly as possible when reaching light guide plate, finally, display screen has more remarkable imaging effect on brightness, color, color gamut.

[0024] In order to achieve uniform dispersion of light rays of the backlight module and improve the production efficiency of the assembled module, the technical scheme provides a back plate assembly. Specifically, in the technical scheme, the reflection layer 30 is directly fixed on the back plate 10 by spraying, thereby replacing the reflection sheet. In this way, the reflection sheet does not need to be separately manufactured, thereby saving the time and cost of opening the reflection sheet knife mold, improving the development speed of the backlight module, and in the module production line, the back plate assembly is used as a whole piece to participate in the module assembly, thereby canceling the step of assembling the reflection sheet in the module production line, thereby saving the development and production cost of the backlight module. Further, compared with the use of the reflection sheet, the reflection layer 30 does not need to consider the positioning problem, thereby further improving the production efficiency of the backlight module. After the back plate assembly is applied to the backlight module, part of the light emitted by the light emitting device 20 of the back plate assembly is reflected back to the reflection layer 30 of the back plate assembly when encountering the light guide plate. At this time, the light is directly diffusely reflected by the reflective ink to return to the light guide plate, and the light excites the quantum dots to form a high color gamut display effect. At the same time, the arc surface around the back plate 10 is covered by the coating of the reflection layer 30, which can improve the brightness uniformity of the backlight module. In summary, while saving the cost of the module structure, the display index of the high-brightness high-color-gamut picture can be improved, and the picture color is more vivid.

[0025] In the technical solution, the light is not reflected to the single light plate by the traditional structure of the reflecting sheet, but the white light reflecting ink and the quantum dots are directly coated on the mounting surface of the back plate 10 by the spraying process. The mounting surface of the back plate 10 refers to the surface of the back plate 10 facing the light guide plate after the back plate 10 module assembly is completed. Thus, the outer surface of the mounting surface of the back plate 10 theoretically has light reflecting capability (in fact, the edge of the mounting surface may be occupied and blocked by the adhesive medium, the light guide plate, the diffuser sheet and other structures due to the assembly process of the backlight module). Thus, compared with the reflecting sheet, the reflecting layer 30 further increases the reflecting area of the back plate assembly. At this time, the reflecting area includes the flat plate area on the back plate 10 on which the light emitting device 20 is mounted (the flat plate area is provided with a groove structure for avoiding or limiting the light emitting device 20 and other structures of the backlight module on the back plate 10, so that the structures can be relatively fixedly mounted) and the arc edge area surrounding the light emitting device 20. In the structure of the back plate assembly, the reflecting layer 30 is first coated on the mounting surface of the back plate by the spraying process, and then the light emitting device is mounted. At this time, the back plate assembly forms a hierarchical structure of the back plate 10, the reflecting layer 30 and the light emitting device 20 in sequence. Of course, the light emitting device 20 can be shielded by using a shielding structure to avoid the light emitting device 20 from being positioned on the reflecting layer 30, or the reflecting layer 30 can be directly coated on the surface of the light emitting device 20, which is not limited herein. The reflecting layer 30 includes the white light reflecting ink and the quantum dots. The light reflecting ink is composed of color powder, stabilizer and resin and other materials to have heat resistance, so as to prevent the reflecting layer 30 from falling off the back plate 10 in the case of serious heat generation of the display screen. The quantum dots can provide higher color saturation, wider color gamut and higher brightness for the light reflected to the light guide plate after being excited by the light. The reflecting layer 30 can be a composite layer structure, that is, the light reflecting ink is coated on the mounting surface of the back plate 10 as the bottom layer of the reflecting layer 30, and then the material containing quantum dots is coated on the surface of the light reflecting ink. The material containing quantum dots refers to a liquid material containing quantum dots and organic solvent, which can also contain a surfactant or a stabilizer. It can be understood that the organic solvent can be an alcohol or a ketone, which is a non-reactive or low-reactive solvent to avoid chemical reaction with the surface ligand of the quantum dots. The surfactant can be a non-ionic surfactant or an anionic surfactant, and the stabilizer can be an antioxidant or a light stabilizer. The above reagents can be reasonably selected through limited experiments, which are not limited herein. In another embodiment, the reflecting layer 30 can be a mixed layer, that is, the light reflecting ink and the quantum dots are mixed in a solvent. At this time, only one spraying action is needed to have a layer of reflecting layer 30. It can be understood that the above two embodiments can have the same or similar display effect, which is not limited herein. It can be understood that the light emitting device 20 can be a single LED lamp or an LED light bar, which is not limited herein.

[0026] Specifically, in an embodiment, the reflecting layer 30 comprises a light-reflecting ink layer 31 and a quantum dot layer 32 arranged in sequence, the light-reflecting ink layer 31 contacts the mounting surface of the back plate 10; the light-reflecting ink layer 31 and the quantum dot layer 32 both comprise a first region 301 and a second region 302, the first region 301 is arranged close to the light-emitting device 20, the second region 302 is arranged away from the light-emitting device 20, the substance density of the first region 301 is lower than that of the second region 302, and it can be understood that, from the perspective of uniformity of light reflection, considering that the area closer to the light-emitting device 20 is more concentrated in light, and the light-emitting device 20 is avoided from appearing over-bright or spot phenomenon, the setting of the reflecting layer 30 into regions with different substance densities can effectively adjust the light reflection capability, the substance density of the light-reflecting ink layer 31 and the quantum dot layer 32 of the first region 301 is lower, and by reducing the density, it is helpful to reduce light absorption and reduce the reflection capability, so that the light can be more uniformly propagated in the entire reflecting layer 30, and the local over-brightness caused by direct irradiation of the light-emitting device 20 is reduced; the second region 302 contains more reflecting materials, so as to enhance the light reflection capability of the area away from the light-emitting device 20, so as to compensate for the light loss of the second region 302, so as to ensure that the part of the light guide plate corresponding to the second region 302 has equal or close brightness to the part of the light guide plate corresponding to the first region 301, and the overall display effect is ensured to be within a reasonable error range.

[0027] In an embodiment of the present application, please refer to Figure 2 The light-emitting device 20 is an LED light bar with high brightness, low power consumption and long service life, the mounting surface of the back plate 10 comprises a central mounting area 10a of the back plate 10 and an edge area 10b arranged around the central mounting area 10a, and a plurality of LED light bars are arranged at intervals in the central mounting area 10a, so as to improve the light emission uniformity of the LED light bar on the back plate 10, wherein a first region 301 is formed between any two adjacent LED light bars, and the edge area 10b forms a second region 302, and it can be understood that the edge area 10b essentially comprises the entire peripheral arc outer surface of the back plate 10, and the reflecting layer 30 covering the edge area 10b can improve light reflection and scattering at the edge, so as to enhance the brightness uniformity of the entire screen.

[0028] In an embodiment of the present application, please refer to Figure 2 The substance densities of the first region 301 and the second region 302 gradually increase along the direction from close to the LED light bar to away from the LED light bar, and in this regard Figure 2The numbers "75", "100", "120" and "150" on the left side explain that the numbers only represent the trend of the material density of the reflective ink and the quantum dots in the reflective layer 30 along the change direction, and the material density can be understood as the content ratio of the toner in the unit volume of the reflective ink in the reflective ink material under a single variable (the single variable can be understood as only considering the content ratio without considering the refractive index of the toner, the characteristics of the resin and the like), and the same is true for the quantum dots. Of course, the material density can also be the content ratio per unit area after the reflective layer 20 is coated on the back plate 10. In this way, the material density of the reflective layer 30 is set to be a stepped density, which is helpful to optimize the light distribution, reduce the excessive brightness and spot problems caused by the close distance of the light emitting device 20, and improve the brightness and uniformity of the entire display area.

[0029] Further, since the second area 302 is far away from the LED light bar, the maximum material density of the second area 302 is set to be greater than that of the first area 301, so that the overall reflection ability of the second area 302 can be enhanced, thereby the light can be scattered and dispersed more effectively, the light spot and hot spot can be reduced, and the brightness uniformity of the entire display panel can be improved.

[0030] In an embodiment of the present application, the reflective layer 30 has any one of the features A1, B1 and C1.

[0031] A1: please refer to Figure 3 The reflective layer 30 includes a plurality of reflective ink layers 31 and quantum dot layers 32, and the reflective ink layers 31 and the quantum dot layers 32 are alternately and laminatedly arranged. In this way, the structure of the alternately laminated layers can increase the number of light reflections, thereby improving the overall reflection efficiency. Through multiple reflections, the light can be better mixed between the layers, the light spot and the dark area can be reduced, the display uniformity can be improved, and thus the display requirements of the display device can be met.

[0032] B1: please refer to Figure 4 The reflective layer 30 includes one reflective ink layer 31 and one quantum dot layer 32, the reflective ink layer 31 includes a plurality of laminated reflective ink sub-layers 311, and the quantum dot layer 32 includes a plurality of laminated quantum dot sub-layers 321. The multi-layer structure allows more precise light management, and each layer can be optimized for specific optical requirements, thereby meeting the display requirements of the display device.

[0033] C1: please refer to Figure 5The reflective layer 30 comprises a plurality of light-reflecting ink layers 31 and quantum dot layers 32, the light-reflecting ink layers 31 and the quantum dot layers 32 are alternately stacked, each light-reflecting ink layer 31 comprises a plurality of light-reflecting ink sub-layers 311 stacked, and each quantum dot layer 32 comprises a plurality of quantum dot sub-layers 321 stacked, so that, in the technical solution, the reflective layer 30 has the effects of improving reflection and uniformity by the multilayer alternately stacked structure, and has the benefits of optimizing light management and stability by the sub-layer structure, and can provide customized optical solutions for specific display applications.

[0034] In an embodiment, the reflective layer 30 is a reflective composite layer composed of light-reflecting ink and quantum dots, at this time, the light-reflecting ink and the quantum dots are mixed together by a known bonding agent, so that the reflective composite layer is only physically mixed, and no chemical reaction occurs between the two components to form a new substance, thereby ensuring the independent physical and chemical properties of each component.

[0035] The utility model provides a kind of backlight module, please refer to Figure 6 , backlight module includes light guide plate and backplate assembly, light guide plate is fixedly connected backplate assembly, the light entrance surface of light guide plate faces reflective layer 30, so, the uniformity of light entering the light entrance surface of light guide plate can be improved by the reflection effect of reflective layer 30, the specific structure of backplate assembly refers to the above embodiment, simultaneously, the backplate assembly includes all embodiments of backplate assembly, since the backlight module proposed in the utility model adopts all technical solutions of the above all embodiments, it at least has all beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0036] The utility model provides a kind of display module, including display screen and backlight module, display screen connects backlight module, the light exit surface of light guide plate faces display screen, light in display screen after the light in backlight module through light guide plate, diffusion sheet and brightening film etc.

[0037] The utility model provides a kind of display equipment, display equipment can be television, computer etc., not limited here, display module includes all embodiment structures of backplate assembly proposed in the utility model, since the display equipment proposed in the utility model adopts all technical solutions of the above all embodiments, it at least has all beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0038] The above are only exemplary embodiments of the present application, and do not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A backplane assembly, characterized by, The backboard assembly comprises a backboard, a light-emitting device and a reflective layer, the backboard has a mounting surface, the reflective layer is coated on the mounting surface of the backboard, and the light-emitting device is arranged on the reflective layer. The reflective layer comprises light-reflecting ink and quantum dots.

2. The backplane assembly of claim 1, wherein, The reflective layer comprises a light-reflecting ink layer and a quantum dot layer arranged in sequence, the light-reflecting ink layer contacts the mounting surface of the backboard, the light-reflecting ink layer and the quantum dot layer each comprise a first region and a second region, the first region is arranged close to the light-emitting device, and the second region is arranged away from the light-emitting device, the substance density of the first region is lower than that of the second region, and the light-emitting device is arranged on the light-reflecting ink layer or the quantum dot layer.

3. The backplane assembly of claim 2, wherein, The light-emitting device is an LED light bar, the mounting surface of the backboard comprises a central mounting area of the backboard and an edge area surrounding the central mounting area, a plurality of LED light bars are arranged in the central mounting area at intervals, the first region is formed between any two adjacent LED light bars, and the second region is formed in the edge area.

4. The backplane assembly of claim 3, wherein, The substance density of the first region and the second region gradually increases in a direction from close to the LED light bar to away from the LED light bar.

5. The backplane assembly of claim 4, wherein, The maximum substance density of the second region is greater than that of the first region.

6. The backsheet assembly of any one of claims 2 to 5, wherein, The reflective layer has any one of features A1, B1 and C1, wherein, A1: the reflective layer comprises a plurality of light-reflecting ink layers and a plurality of quantum dot layers, and the light-reflecting ink layers and the quantum dot layers are arranged in an alternating stack; B1: the reflective layer comprises one light-reflecting ink layer and one quantum dot layer, the light-reflecting ink layer comprises a plurality of light-reflecting ink sub-layers arranged in a stack, and the quantum dot layer comprises a plurality of quantum dot sub-layers arranged in a stack; C1: the reflective layer comprises a plurality of light-reflecting ink layers and a plurality of quantum dot layers, the light-reflecting ink layers and the quantum dot layers are arranged in an alternating stack, each light-reflecting ink layer comprises a plurality of light-reflecting ink sub-layers arranged in a stack, and each quantum dot layer comprises a plurality of quantum dot sub-layers arranged in a stack.

7. The backplane assembly of claim 1, wherein, The reflective layer is a reflective composite layer, and the reflective composite layer is composed of light-reflecting ink and quantum dots.

8. A backlight module, characterized in that, The backlight module comprises a light guide plate and the backboard assembly according to any one of claims 1 to 7, the light guide plate is fixedly connected to the backboard assembly, and a light-incident surface of the light guide plate faces the reflective layer.

9. A display module, characterized by The display module comprises a display screen and the backlight module according to claim 8, the display screen is connected to the backlight module, and a light-emitting surface of the light guide plate faces the display screen.

10. A display device, characterized by The display device comprises the display module according to claim 9.

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