Backlight module and display device

Abstract

The utility model relates to a backlight module and a display device. The backlight module comprises a back plate, a light guide plate and a light guide plate, a light source; an optical film group; a middle frame; the reflection assembly comprises a first reflection sheet, a second reflection sheet and a color conversion assembly, the first reflection sheet and the second reflection sheet are connected in a bending mode, the color conversion assembly comprises a first color conversion layer and a second color conversion layer, and part of light emitted by the light source is converted into white light by the first color conversion layer and the second color conversion layer. According to the backlight module and the display device, the first reflecting sheet and the first color conversion layer are arranged between the side plate of the back plate and the side wall of the optical film set, and the second reflecting sheet and the second color conversion layer are arranged between the bottom surface of the bearing part of the middle frame and the top surface of the optical film set, so that blue leaked from the edge of the optical film set can be removed. Light is effectively converted into white light, so that the problem that the color gamut at the edge of the display device is slightly blue is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a display technical field especially, a kind of backlight module and display device that can improve peripheral blue. BACKGROUND

[0002] With the development of display technology, mini (Mini) light emitting diode (Light Emitting Diode, LED) has been more and more widely used. The display device using Mini LED backlight technology performs better in dynamic contrast, brightness, color gamut, viewing angle, and has the advantages of light and thin, high quality, low power consumption and energy saving. The existing direct type quantum dot backlight module includes a backboard, a light emitting piece arranged at the bottom of the backboard, and an optical film piece group arranged above the light emitting piece. The optical film piece group includes a diffusion plate and a quantum dot film piece QDEF (Quantum Dot Enhancement Film) above the diffusion plate. The light emitting piece uses a blue LED that can emit blue light. A part of the blue light can excite green light and red light when passing through the quantum dot film piece, and mix with another part of the blue light that is not excited to produce white light.

[0003] However, due to the angle and quantum dot film piece edge failure problems of the light closer to the edge of the backlight module, the light emitted from the light emitting piece (especially the light incident on the edge) is difficult to be fully excited by the quantum dot film piece, resulting in a blue color gamut at the edge. SUMMARY

[0004] To solve the above technical problems, the purpose of the utility model is to provide a backlight module and display device that can improve the peripheral blue.

[0005] According to one aspect of the utility model, the utility model provides a backlight module, comprising:

[0006] A backboard, the backboard includes a bottom plate and a side plate connected to the bottom plate, the bottom plate and the side plate form a containing space;

[0007] A light source, the light source is arranged on the bottom plate, the light source includes a plurality of light emitting elements;

[0008] An optical film piece group, the light source film piece group is contained in the containing space and located above the light source;

[0009] A middle frame, the middle frame is clamped on the top of the side plate, the middle frame has a bearing part, and the bearing part is located above the edge of the optical film piece group;

[0010] a reflecting assembly, the reflecting assembly comprising a first reflecting sheet and a second reflecting sheet connected to each other by bending, the first reflecting sheet being arranged between the side plate and a side wall of the optical film set, the second reflecting sheet being pressed between a bottom surface of the bearing part and a top surface of the optical film set; and

[0011] a color conversion assembly, the color conversion assembly comprising a first color conversion layer and a second color conversion layer, the first color conversion layer being arranged on a surface of the first reflecting sheet facing the side wall of the optical film set, the second color conversion layer being arranged on a surface of the second reflecting sheet facing the top surface of the optical film set;

[0012] wherein a part of the light emitted by the light source is converted into white light by the first color conversion layer and the second color conversion layer.

[0013] As an optional technical solution, the optical film set comprises a quantum dot conversion film for converting at least a part of the light emitted by the light source into white light.

[0014] As an optional technical solution, the quantum dot conversion film has a plurality of color conversion particles, and the quantum dot conversion film has a first region and a second region surrounding the first region.

[0015] As an optional technical solution, the optical film set further comprises a diffusion plate, the quantum dot conversion film is located on the diffusion plate, and a step structure is formed by protruding at an edge of the bottom plate, and the optical film set is supported on the step structure.

[0016] As an optional technical solution, the color conversion assembly further comprises a third color conversion layer, the step structure has a first side wall facing the light source, and the third color conversion layer is arranged on the first side wall, and a part of the light emitted by the light source is converted into white light by the third color conversion layer.

[0017] As an optional technical solution, the first color conversion layer, the second color conversion layer, and the third color conversion layer are phosphor layers or ink layers or quantum dot layers.

[0018] As an optional technical solution, the reflecting assembly further comprises a third reflecting sheet arranged on the first side wall, and the third color conversion layer is arranged on a surface of the third reflecting sheet facing the light source.

[0019] As an optional technical solution, the second reflecting sheet and the second color conversion layer exceed the bearing part.

[0020] As an optional technical solution, the first light emitting element is defined as a first light emitting element in the plurality of light emitting elements that is closest to the first side wall, and a vertical projection of the second reflecting sheet and the second color conversion layer on the bottom plate does not reach the first light emitting element.

[0021] According to another aspect of the present application, the present application further provides a display device, comprising a display module and the backlight module as described above, the display module is carried on the carrying portion, the display module has adjacent display area and peripheral area, the second reflective sheet and the second color conversion layer are located in the peripheral area in the vertical projection of the display module.

[0022] In summary, the backlight module and the display device of the present application can effectively convert the blue light leaked from the edge of the optical film sheet group into white light by arranging the first reflective sheet and the first color conversion layer between the side plate of the back plate and the side wall of the optical film sheet group and arranging the second reflective sheet and the second color conversion layer between the bottom surface of the carrying portion of the middle frame and the top surface of the optical film sheet group, thereby avoiding the problem of blue color domain at the edge of the display device.

[0023] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments, but not as a limitation to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A schematic diagram of the generation of blue edge in the display device in the prior art.

[0025] Figure 2 A schematic diagram of the display device provided by the present application. DETAILED DESCRIPTION

[0026] In order to make the technical features, content and advantages of the present application and the effects achieved more easily understood, the present application will be described in detail below with reference to the accompanying drawings and in the form of embodiments, and the drawings used are only for the purpose of illustration and auxiliary description, and not necessarily the true proportion and accurate configuration after the implementation of the present application. Therefore, the proportion and configuration relationship of the drawings should not be interpreted as limiting the scope of the present application in actual implementation. Please note.

[0027] Please refer to Figure 1 , Figure 1A schematic diagram of the prior art display device generating blue edges. The display device 1000' includes a backlight module 10' and a display module 20', the backlight module 10' includes a back plate 101', a light source 102', and an optical film set 103', the back plate 101' includes a bottom plate 1011' and a side plate 1012' connected to the bottom plate 1011', the bottom plate 1011' and the side plate 1012' form a containing space, the light source 102' is arranged on the bottom plate 1011', and the optical film set 103' is contained in the containing space and located above the light source 102'. The light source 102' includes a plurality of blue light-emitting diodes, and the optical film set 103' includes a blue light conversion film 1031' and a diffusion plate, a brightness enhancement film and other optical films. When the blue light emitted by the light source 102' passes through the blue light conversion film 1031', green light and red light can be excited, and the white light is generated by mixing the unexcited part of the blue light. In actual use, part of the blue light emitted by the blue light-emitting diode will leak from the edge of the diffusion plate, the brightness enhancement film and other optical films when passing through the diffusion plate, the brightness enhancement film and other optical films. The leaked blue light is not converted by the blue light conversion film 1031', so that the color gamut at the edge of the display device 1000' is blue. In addition, the blue light conversion film 1031' is usually a quantum dot conversion film, and the quantum dot is easy to be quenched by water and oxygen or high temperature. The four sides of the quantum dot conversion film are not protected by a barrier layer due to the process, and the film periphery will contact the water and oxygen in the air, resulting in the edge failure problem, so as to further aggravate the color gamut of the display device 1000' at the edge.

[0028] To solve the above problems, the utility model provides a kind of backlight module and display device. Please refer to Figure 2 , Figure 2The utility model provides a kind of display device's schematic diagram.It is provided that display device 1000 includes backlight module 10 and display module 20.Backlight module 10 includes backplate 101, light source 102, optical film piece group 103, middle frame 104, reflection component 105 and color conversion component 106.Wherein, backplate 101 includes bottom plate 1011 and with the side plate 1012 of bottom plate 1011, bottom plate 1011 and side plate 1012 form a containing space, light source 102 is set on bottom plate 1011, and light source 102 includes multiple light emitting elements, specifically in an embodiment can be blue light emitting diode.Optical film piece group 103 is contained in the containing space of bottom plate 1011 and side plate 1012 and is located above light source 102.Middle frame 104 is clamped in the top of side plate 1012, and middle frame 104 has bearing part 1041, when backlight module 10 is applied to display device 1000, bearing part 1041 is used to bear display module 20, and bearing part 1041 is located above the edge of optical film piece group 103.Reflection component 105 includes mutually bent first reflector sheet 1051 and second reflector sheet 1052, first reflector sheet 1051 is set between side plate 1012 and the side wall of optical film piece group 103 (or, first reflector sheet 1051 is set on the inner side of side plate 1012 adjacent light source 102), second reflector sheet 1052 is pressed between the bottom surface of bearing part 1041 and the top surface of optical film piece group 103, and first reflector sheet 1051 and second reflector sheet 1052 are integrally formed as "L" type.Color conversion component 106 includes first color conversion layer 1061 and second color conversion layer 1062, first color conversion layer 1061 is set on the surface of first reflector sheet 1051 towards the side wall of optical film piece group 103, and second color conversion layer 1601 is set on the surface of second reflector sheet 1052 towards the top surface of optical film piece group 103.By the setting of first color conversion layer 1061 and second color conversion layer 1062 and the position setting of two, part of light emitted by light source 102 is leaked to reflection component 105 and color conversion component 106 when the edge of optical film piece group 103, the part of light can be converted into white light by first color conversion layer 1061 and second color conversion layer 1062 and is reflected by reflection component 160 after reemission and is shot towards display module 20.Such can solve the problem that the color gamut of display device 1000 edge is blue due to the edge leakage of blue light when the light (blue light) emitted by light source 102 passes through the edge of optical film piece group 103.In an embodiment, first reflector sheet 1051 is pasted on the side wall of side plate 1012, and second reflector sheet 1052 is partially pasted on the bottom surface of bearing part 1041, but not limited thereto.

[0029] It should be noted that the optical film set 103 includes a quantum dot conversion film 1031 and other optical films such as a diffusion plate, the quantum dot conversion film 1031 is located on the diffusion plate, when the blue light emitted by the light source 102 passes through the quantum dot conversion film 1031, the quantum dot conversion film 1031 can convert at least a part of the light emitted by the light source 102 into white light, and a small part of the light leaked from the optical film set 103 is converted into white light by the first color conversion layer 1061 and the second color conversion layer 1062. Among them, the quantum dot film is a new type of nanometer material functional film with unique optical properties, which can accurately and efficiently convert blue light into bright red light and bright green light, and greatly improve the color gamut performance of the liquid crystal display screen by fine adjustment of the backlight. In addition, the quantum dot conversion film 1031 has a plurality of color conversion particles, the quantum dot conversion film 1031 has a first region and a second region, the second region surrounds the first region, in other words, the first region is the central region of the quantum dot conversion film 1031, and the second region is the peripheral region of the quantum dot conversion film 1031. The four side edges of the quantum dot conversion film 1031 (i.e. the second region of the quantum dot conversion film 1031) are not protected by a barrier layer due to the process, and the second region of the quantum dot conversion film 1031 will contact water and oxygen in the air, causing the edge to fail. At this time, the structures of the first region and the second region are slightly different, and the quantum dot conversion film 1031 at the edge part cannot realize its function of converting blue light into white light, at this time, more blue light is leaked from the optical film set 103, and the backlight module 10 of the utility model can also effectively convert this part of the leaked blue light into white light due to the setting of the first reflecting sheet 1051, the first color conversion layer 1061, the second reflecting sheet 1052 and the second color conversion layer 1062.

[0030] In addition, the edge of the bottom plate 1011 is provided with a stepped structure 1013, the optical film group 103 is carried on the stepped structure 1013, the stepped structure 1013 has a first side wall facing the light source 102, the reflection assembly 105 further comprises a third reflection sheet 1053, and the color conversion assembly 106 further comprises a third color conversion layer 1063. The third reflection sheet 1053 and the third color conversion layer 1063 are arranged on the first side wall, and the third color conversion layer 1063 is arranged on the surface of the third reflection sheet 1053 facing the light source 102 (that is, the third reflection sheet 1053 is arranged between the first side wall and the third color conversion layer 1063). In this way, part of the light emitted from the side of the light source 102 can be converted into white light by the third color conversion layer 1063 and re-emitted after being reflected by the third reflection sheet 1053 and then irradiated to the display module 20. In this way, the utilization rate of the light emitted by the light source 102 can be improved, the efficiency of converting the light into white light from blue light can be improved, and the problem of blue color shift at the edge can be further reduced. It is worth mentioning that in the embodiment, the first color conversion layer 1061, the second color conversion layer 1062 and the third color conversion layer 1063 are all phosphor layers (but not limited to this, in other embodiments, the first color conversion layer 1061, the second color conversion layer 1062 and the third color conversion layer 1063 can also be ink layers (specifically, yellow ink) or quantum dot layers), and the phosphor layer can be coated on the surface of the first reflection sheet 1051, the second reflection sheet 1052 and the third reflection sheet 1053 by coating. In the embodiment, the phosphor layer is one layer, and the material of the phosphor layer is a mixture of different phosphor materials. For example, it includes red phosphor material and green phosphor material, but the present application is not limited to this. In the embodiment, by mixing the phosphor, the phosphor layer is further excited, so that the light efficiency and color gamut of the backlight module can be improved. The blue light emitted from the edge of the optical film group 103 irradiates the phosphor layer to excite the red phosphor and the green phosphor, so that the effect of converting the blue light into white light can be achieved. It should be noted that the color of the first reflection sheet 1051, the second reflection sheet 1052 and the third reflection sheet 1053 can be white or yellow. When the first reflection sheet 1051, the second reflection sheet 1052 and the third reflection sheet 1053 are yellow, the absorption of blue light in the light can be enhanced, which is beneficial to further reduce the leakage of blue light. The material, size and reflectivity of the first reflection sheet 1051, the second reflection sheet 1052 and the third reflection sheet 1053 can be determined according to the actual situation, which is not limited here.

[0031] It is worth mentioning that the bearing part 1041 is used for bearing the display module 20, the display module 20 has a display area and a peripheral area, the peripheral area is arranged around the display area, the second reflective sheet 1052 and the second color conversion layer 1062 are beyond the outer edge of the bearing part 1041, and the vertical projection of the second reflective sheet 1052 and the second color conversion layer 1062 on the display module 20 is located in the peripheral area. Alternatively, for example, the light emitting element with the minimum distance from the first side wall in the plurality of light emitting elements is defined as the first light emitting element 1021, and the vertical projection of the second reflective sheet 1052 and the second color conversion layer 1062 on the bottom plate 1011 does not reach the first light emitting element 1021. Therefore, the blue light leaked from the edge of the optical film group 103 can be maximally converted into yellow light or white light, and the normal display of the display device 100 in the display area is not affected, so as to further optimize the problem of the edge color gamut of the display device 1000 being blue.

[0032] In summary, the backlight module and the display device of the present application can effectively convert the blue light leaked from the edge of the optical film group into white light by arranging the first reflective sheet and the first color conversion layer between the side plate of the back plate and the side wall of the optical film group and arranging the second reflective sheet and the second color conversion layer between the bottom surface of the bearing part of the middle frame and the top surface of the optical film group, thereby avoiding the problem of the color gamut of the display device being blue at the edge.

[0033] The above-described embodiments are only used to illustrate the technical ideas and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the patent scope of the present application, that is, any equivalent changes or modifications made according to the spirit disclosed by the present application should be covered in the patent scope of the present application.

Claims

1. A backlight module, characterized in that, include: The back panel includes a bottom plate and a side plate connected to the bottom plate, the bottom plate and the side plate forming an accommodating space; A light source, which is disposed on the base plate, includes multiple light-emitting elements; An optical film assembly, wherein the light source film assembly is housed in the housing space and located above the light source; The middle frame is snapped onto the top of the side plate and has a support portion located above the edge of the optical film assembly. A reflective assembly includes a first reflective sheet and a second reflective sheet that are bent and connected to each other. The first reflective sheet is disposed between the side plate and the side wall of the optical film assembly, and the second reflective sheet is pressed against the bottom surface of the support portion and the top surface of the optical film assembly. and A color conversion assembly includes a first color conversion layer and a second color conversion layer. The first color conversion layer is disposed on the surface of the first reflective sheet facing the sidewall of the optical film assembly, and the second color conversion layer is disposed on the surface of the second reflective sheet facing the top surface of the optical film assembly. In this process, a portion of the light emitted by the light source is converted into white light by the first color conversion layer and the second color conversion layer.

2. The backlight module according to claim 1, characterized in that, The optical film assembly includes a quantum dot conversion film used to convert at least a portion of the light emitted by the light source into white light.

3. The backlight module according to claim 2, characterized in that, The quantum dot conversion film has multiple color conversion particles, and the quantum dot conversion film has a first region and a second region, with the second region surrounding the first region.

4. The backlight module according to claim 2, characterized in that, The optical film assembly also includes a diffuser plate on which the quantum dot conversion film is located. The edge of the base plate protrudes to form a stepped structure, on which the optical film assembly is supported.

5. The backlight module according to claim 4, characterized in that, The color conversion component also includes a third color conversion layer. The stepped structure has a first sidewall facing the light source, and the third color conversion layer is disposed on the first sidewall. A portion of the light emitted by the light source is converted into white light by the third color conversion layer.

6. The backlight module according to claim 5, characterized in that, The first color conversion layer, the second color conversion layer, and the third color conversion layer are phosphor layers, ink layers, or quantum dot layers.

7. The backlight module according to claim 5, characterized in that, The reflective assembly also includes a third reflective sheet disposed on the first sidewall, and a third color conversion layer disposed on the surface of the third reflective sheet facing the light source.

8. The backlight module according to claim 1, characterized in that, The second reflective sheet and the second color conversion layer extend beyond the support portion.

9. The backlight module according to claim 1, characterized in that, The edge of the base plate protrudes to form a stepped structure, and the optical film assembly is supported on the stepped structure. The stepped structure has a first sidewall facing the light source. The light-emitting element with the smallest distance from the first sidewall among the plurality of light-emitting elements is defined as the first light-emitting element. The vertical projection of the second reflector and the second color conversion layer on the base plate does not reach the first light-emitting element.

10. A display device, characterized in that, The display module includes a display module and a backlight module as described in any one of claims 1-9. The display module is supported on the support portion and has an adjacent display area and a peripheral area. The vertical projection of the second reflective sheet and the second color conversion layer on the display module is located in the peripheral area.

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