Backlight module and display device

Abstract

The present application discloses a backlight module and a display device, which relates to the field of display technology. The backlight module includes a plurality of light panels and a back panel. The plurality of light panels are spliced ​​and arranged on the surface of the back panel, and a light panel seam is formed between two adjacent light panels. The backlight module also includes a photoluminescent structure and a diffusion plate. The diffusion plate is arranged on the side of the light panel away from the back panel. The photoluminescent structure is arranged at the light panel seam to fill in the light of the light panel seam, and the photoluminescent structure is made of photoluminescent material. Through the above design, when the display device is working, the light emitted by the light panel controls the photoluminescent structure to light up, fill in the light of the light panel seam, and the light emitted by the photoluminescent structure is more matched with the light emitted by the light panel, and the transition is uniform. In addition, the present application is more energy-saving, and the heat generated is less, and the impact on the light panel is also smaller.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] With the continuous development of optoelectronic display technology, the demand for large-size display devices has gradually increased. However, due to process limitations, the yield rate of producing large-size display devices is low. In order to save loss costs, companies generally adopt the production method of producing small light panels and then splicing multiple small light panels for production.

[0003] However, light board seams will be formed between adjacent light boards, and dark lines will be generated at the positions corresponding to the light board seams when the display device is displaying, affecting the normal display of the display device. Therefore, how to solve the problem of dark lines that will appear when the display device is displaying due to the light board seams has become an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this application is to provide a backlight module and a display device to prevent dark lines from appearing at the seams of the corresponding light panels of the display device, thereby improving the optical quality of the display device.

[0005] The present application discloses a backlight module, which includes multiple light boards and a backboard. The multiple light boards are spliced ​​and arranged on the surface of the backboard, and a light board seam is formed between two adjacent light boards. The backlight module also includes a photoluminescent structure and a diffusion plate. The diffusion plate is arranged on the side of the light board away from the backboard. The photoluminescent structure is arranged at the light board seam to fill in the light at the light board seam, and the photoluminescent structure is made of photoluminescent material.

[0006] Optionally, the backlight module also includes a light board mounting bracket, the light board mounting bracket includes a rectangular frame and at least one branch, the branch is arranged in the rectangular frame and corresponds to the seam of the light board, and the two ends of the branch are respectively connected to the rectangular frame, dividing the rectangular frame into at least two light board mounting grooves, and the light board is arranged in the light board mounting groove; the rectangular frame and the branch are composed of the photoluminescent structure.

[0007] Optionally, a reflective structure is provided on the diffusion plate, and the reflective structure is opposite to the edge of the light board, reflecting the light emitted by the light board toward the photoluminescent structure.

[0008] Optionally, the backlight module also includes a light board mounting bracket, the light board mounting bracket includes a rectangular frame and at least one branch, the branch is arranged in the rectangular frame and corresponds to the seam of the light board, and the two ends of the branch are respectively connected to the rectangular frame, dividing the rectangular frame into at least two light board mounting grooves, and the light board is arranged in the light board mounting grooves; the rectangular frame and the branch are both porous transparent substrates, and the photoluminescent structure is filled in the holes of the porous transparent substrate.

[0009] Optionally, the side of the branch facing away from the back plate is recessed downward to form a concave structure.

[0010] Optionally, the backlight module further includes a plurality of baffles, the photoluminescent structure includes a plurality of sub-luminescent structures, the baffles are arranged between two adjacent sub-luminescent structures, and the distance between two adjacent baffles is equal to the distance between two adjacent lamp beads in the light board; the material of the baffles is black light-isolating material.

[0011] Optionally, the backlight module further includes a support member, which is disposed between the photoluminescent structure and the diffusion plate, and the length of the support member is equal to the length of the seam of the light panel, and the material of the support member is a transparent material.

[0012] Optionally, the light boards on both sides of the light board seam are respectively the first light board and the second light board, and the side of the support member close to the first light board and the side close to the second light board are both provided with refractive structures, and the light emitted by the first light board and the second light board is refracted above the light board seam after passing through the refractive structure; and the refractive index of the refractive structure gradually decreases along the direction from the back panel to the diffuser panel.

[0013] Optionally, the rectangular frame includes four corner frames and at least four strip frames, the corner frames are respectively located at the four corners of the rectangular frame, and both ends of the strip frames are detachably connected to the two corner frames located on the same side.

[0014] The present application also discloses a display device, which includes a display panel and a backlight module. The display panel and the backlight module are arranged opposite to each other, and the backlight module provides backlight for the display panel.

[0015] Compared with the solution of setting a reflective sheet at the seam of the light board, the present application sets a photoluminescent structure at the seam of the light board. When the display device is working, the lamp beads on the light board emit light, and after being reflected by the diffusion plate, the light is irradiated onto the photoluminescent structure, exciting the photoluminescent material to light up, and filling the light of the light board seam. The light emitted by the photoluminescent structure is brighter than the reflected light, and is more matched with the light emitted by the light board, the transition is more uniform, and the generation of halo is reduced. Compared with the solution of setting a lamp tube at the seam of the light board, the photoluminescent structure uses the light emitted by the lamp beads on the light board to excite the photoluminescent material to emit light, which is more energy-saving, generates less heat, and has less impact on the light board. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0017] Figure 1 is a schematic diagram of a display device according to an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of a backlight module according to an embodiment of the present application;

[0019] Figure 3 This is a schematic diagram of edge lamp beads of a lamp panel according to an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of a light panel bracket according to an embodiment of the present application;

[0021] Figure 5 is a schematic cross-sectional view of a branch according to an embodiment of the present application;

[0022] Figure 6 This is a schematic diagram of a light panel with a reflective sheet provided at a joint in an embodiment of the present application;

[0023] Figure 7 is a schematic top view of a sub-light emitting structure according to an embodiment of the present application;

[0024] Figure 8 is a schematic diagram of a support member according to an embodiment of the present application;

[0025] Figure 9 is an enlarged schematic diagram of a support member according to an embodiment of the present application;

[0026] Figure 10 This is a schematic diagram of a rectangular frame according to an embodiment of the present application.

[0027] Among them, 10, display device; 100, display panel; 200, backlight module; 210, light board; 211, first light board; 212, second light board; 213, lamp beads; 220, backboard; 230, light board seam; 300, photoluminescent structure; 310, sub-luminescent structure; 320, baffle; 400, light board mounting bracket; 410, rectangular frame; 411, corner frame; 412, strip frame; 420, branch; 440, concave structure; 450, light board mounting groove; 500, diffuser; 510, reflective structure; 600, support; 610, refractive structure; 700, reflective sheet; 800, seam uniformity plate. DETAILED DESCRIPTION

[0028] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative. However, the present application can be implemented in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0029] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate relative importance or implicitly specify the quantity of the technical features indicated. Therefore, unless otherwise specified, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features; "plurality" means two or more. The term "comprising" and any variations thereof are intended to be non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0030] In addition, terms indicating orientation or positional relationships such as “center,” “lateral,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside” are described based on the orientation or relative positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present application, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0031] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0032] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0033] Figure 1 is a schematic diagram of a display device according to an embodiment of the present application. Figure 1 As shown, the present application discloses a display device 10 , which includes a display panel 100 and a backlight module 200 . The display panel 100 and the backlight module 200 are arranged opposite to each other, and the backlight module 200 provides backlight for the display panel 100 .

[0034] Among them, the display panel 100 includes: such as TN (Twisted Nematic) display panel 100, IPS (In-Plane Switching) display panel 100, VA (Vertical Alignment) display panel 100 and MVA (Multi-Domain Vertical Alignment) display panel 100, all of which are applicable to the technical solution of this application.

[0035] This application also discloses a backlight module 200 and improves the backlight module 200, which can be used in the display device 10 described above. The backlight module 200 described in this application provides the following design:

[0036] Figure 2 is a schematic diagram of a backlight module according to an embodiment of the present application. Figure 2 As shown, the direction indicated by the arrow in the figure is the transmission direction of part of the light. The present application discloses a backlight module 200, which includes a plurality of light boards 210 and a backboard 220. The plurality of light boards 210 are spliced ​​and arranged on the surface of the backboard 220, and a light board seam 230 is formed between two adjacent light boards 210. The backlight module 200 also includes a photoluminescent structure 300, which is arranged at the light board seam 230 to fill in the light of the light board seam 230, and the photoluminescent structure 300 is made of photoluminescent material.

[0037] Among them, the photoluminescent material is a rare earth photoluminescent polymer material. The light emitted by the lamp beads 213 on the lamp board 210 is reflected by the diffuser plate 500 and irradiated onto the photoluminescent material, entering an excited ionization state. The ionized free electrons have a certain amount of energy and can cause the excited ionization of other atoms. When the photoluminescent material returns to a stable state from the excited ionization state, the photoluminescent structure 300 emits light to fill in the light at the seam 230 of the lamp board.

[0038] Compared with the solution of setting a reflective sheet 700 at the seam 230 of the light board, the present application sets a photoluminescent structure 300 at the seam 230 of the light board. When the display device 10 is working, the light of the lamp beads 213 on the light board 210 controls the photoluminescent structure 300 to light up, and fills the light in the seam 230 of the light board. The light emitted by the photoluminescent structure 300 is brighter than the light emitted by the reflective sheet, and is more matched with the light emitted by the light board 210.

[0039] Compared with the solution of setting lamp tubes at the seams 230 of the light board, the photoluminescent structure 300 excites the photoluminescent material to emit light through the light emitted by the light board 210, which is more energy-saving, generates less heat, and has less impact on the heat dissipation of the light board 210.

[0040] Among them, in order to further improve the luminous efficiency of the photoluminescent structure 300 and make the light emitted by the photoluminescent structure 300 more matched with the light emitted by the lamp board 210, the present application sets the diffuser plate 500 on the side of the lamp board 210 away from the back plate 220, and the diffuser plate 500 is provided with a reflective structure 510 at a position facing the edge of the lamp board 210 to reflect the light emitted by the lamp board 210 toward the photoluminescent structure 300.

[0041] Firstly, the light emitted by the lamp beads 213 can be more irradiated onto the photoluminescent structure 300, making the photoluminescent structure 300 brighter. Secondly, the brightness of the reflective structure 510 corresponding to the diffuser plate 500 is reduced, so that the light transition between the area of ​​the diffuser plate 500 corresponding to the light board 210 and the area of ​​the diffuser plate 500 corresponding to the light board seam 230 can be better, thereby preventing the occurrence of a halo problem between the above two areas.

[0042] Further, you can Figure 3 As shown, the arrow in the figure indicates the direction of partial light transmission. The present application also allows the thickness of the photoluminescent structure 300 to be increased. Specifically, the thickness of the photoluminescent structure 300 is greater than the height of the light panel seam 230. The light-emitting surfaces of the row of lamp beads 213 on the light panel 210 near the seam 230 face the photoluminescent structure 300. This allows more light to reach the photoluminescent structure 300, thereby increasing its brightness. Furthermore, the increased thickness brings the photoluminescent structure 300 closer to the diffuser 500, further improving the brightness of the light panel seam 230. Combined with the reflective structure 510, the response time of the photoluminescent structure 300 can be reduced.

[0043] In order to further facilitate the installation of the light board 210 and prevent the problem that the distance between the light board 210 and the diffuser 500 at different positions is different, which leads to a decrease in the optical quality of the display device 10, the present application also discloses a light board mounting bracket 400, which is combined with the light board mounting bracket 400. Figure 2 and Figure 4 As shown, the light board mounting bracket 400 includes a rectangular frame 410 and at least one branch 420. The branch 420 is disposed within the rectangular frame 410 and corresponds to the light board joint 230. Both ends of the branch 420 are connected to the rectangular frame 410, dividing the rectangular frame 410 into at least two light board mounting slots 450. The light board 210 is disposed within each of the light board mounting slots 450. The rectangular frame 410 and the branch 420 are formed by the photoluminescent structure 300. The thickness of the branch 420 and the rectangular frame 410 is equal to the thickness of the light board 210.

[0044] It can be understood that the entire light board 210 is directly made of photoluminescent material, which can not only facilitate the installation of the light board 210, but also effectively prevent the dark line problem of the display panel 100 caused by the seam 230 of the light board.

[0045] Of course, only the branch 420 may be formed of the photoluminescent structure 300 , while the photoluminescent material or the lamp beads 213 are provided on the surface of the rectangular frame 410 .

[0046] Of course, the thickness of the branch 420 and the thickness of the rectangular frame 410 can also be greater than the thickness of the light board 210, which reduces the distance between the photoluminescent material and the diffuser 500 and indirectly increases the brightness at the light board seam 230.

[0047] Furthermore, the photoluminescent structure 300 can be placed on a carrier. Specifically, the rectangular frame 410 and the branches 420 are both porous transparent substrates, and the photoluminescent structure 300 is filled in the pores of the porous transparent substrate. This increases the gap size of the photoluminescent structure 300, increases the surface area of ​​the photoluminescent structure 300, and thus increases the luminous area of ​​the photoluminescent structure 300, resulting in brighter brightness at the light panel seam 230. Furthermore, the photoluminescent material can be applied only on the surface of the porous transparent substrate, saving costs.

[0048] The thickness of the branch 420 and the rectangular frame 410 is equal to the thickness of the light board 210. Of course, the thickness of the branch 420 and the rectangular frame 410 can also be greater than the thickness of the light board 210, reducing the distance between the photoluminescent material and the diffuser 500, thereby indirectly increasing the brightness at the seam 230 of the light board.

[0049] Figure 5 is a cross-sectional schematic diagram of a branch of an embodiment of the present application, such as Figure 5 As shown, the direction indicated by the arrow in the figure is the direction of partial light transmission. The side of the branch 420 facing away from the back plate 220 is recessed downward to form a concave structure 440. The concave structure 440 can be formed directly by the concave photoluminescent material or by the concave surface of the transparent substrate. The concave structure 440 allows the light emitted by the photoluminescent structure 300 to be concentrated directly above the light panel joint 230.

[0050] Since all sides of the photoluminescent structure 300 are luminous, the light emitted from the side will be blocked by the light board. Therefore, in order to improve the light utilization rate of the photoluminescent structure 300, the present application also adds a reflective sheet 700, such as Figure 6 As shown, the reflective sheet 700 is arranged between the photoluminescent structure 300 and the light board 210, and the reflective surface of the reflective sheet 700 faces the photoluminescent structure 300. Preferably, the reflective sheet 700 is arranged at an angle, and the angle between it and the back plate 220 is an acute angle, so as to reflect the light emitted from the side of the photoluminescent structure 300 to directly above the photoluminescent structure 300, thereby improving the brightness of the light board seam 230.

[0051] Figure 7 is a schematic top view of a sub-light emitting structure according to an embodiment of the present application. Figure 7 As shown, the present application splits the photoluminescent structure 300 by setting a plurality of baffles 320. Specifically, the photoluminescent structure 300 includes a plurality of sub-light-emitting structures 310. The baffle 320 is set between two adjacent sub-light-emitting structures 310, and the distance between two adjacent baffles 320 is equal to the distance between two adjacent lamp beads 213 in the lamp board 210. The material of the baffle 320 is black light-isolating material.

[0052] The sub-light-emitting structures 310 are separated by the baffles 320, so that the brightness of the sub-light-emitting structures 310 in the corresponding area is determined only by the brightness of the lamp beads 213 on the lamp board 210 in the corresponding area. This prevents the light emitted by the sub-light-emitting structure 310 from being transmitted to another sub-light-emitting structure 310, which would cause the brightness of the entire photoluminescent structure 300 to be uniform. This effect is particularly significant on display devices equipped with local dimming technology.

[0053] Figure 8 is a schematic diagram of a support member according to an embodiment of the present application, such as Figure 8As shown, since existing support columns are all set on the light board 210, but the display device 10 of the present application is formed by splicing multiple light boards 210, the optical film such as the diffuser plate 500 on the light board 210 is relatively heavy. If the solution of setting support columns on the light board 210 to support the diffuser plate 500 at points is still adopted, dark spots will be generated at the positions corresponding to the support columns on the diffuser plate 500, or the diffuser plate 500 will be damaged at the positions corresponding to the support columns. Therefore, the present application provides a support member 600.

[0054] The specific design is as follows: the support member 600 is disposed between the photoluminescent structure 300 and the diffuser plate 500, and its length is equal to the length of the light board seam 230. The support member 600 is made of a transparent material. The support area of ​​the support member 600 is increased to accommodate the display device 10 of the present application, preventing dark spots or damage to the diffuser plate 500 at the location corresponding to the support member 600. Furthermore, by moving the support member 600 onto the photoluminescent structure 300, the support column on the light board 210 is no longer required, thereby improving the production yield of the light board 210.

[0055] Furthermore, the present application also sets a seam homogenizing plate 800 between the support member 600 and the diffuser plate 500, the width of the seam homogenizing plate 800 is equal to the width of the light board seam 230, and the positive projection of the seam homogenizing plate 800 on the back panel completely falls into the light board seam 230, homogenizing the light emitted by the photoluminescent structure 300, and preventing the light emitted by the lamp beads 213 on the light board 210 and the light emitted by the photoluminescent structure 300 from having a transition area that is too strong, thereby producing a halo phenomenon.

[0056] The support column and the photoluminescent structure 300 may be fixed to the back plate 220 by screws, and the seam light-diffusing plate 800 may be glued to the support column.

[0057] Figure 9 is an enlarged schematic diagram of a support member according to an embodiment of the present application, as shown in FIG. Figure 9As shown in the figure, the direction indicated by the arrow is the direction of partial light transmission. The light boards 210 on both sides of the light board joint 230 are respectively the first light board 211 and the second light board 212. The support member 600 is provided with a refractive structure 610 on both the side close to the first light board 211 and the side close to the second light board 212. The light emitted by the first and second light boards 211, 212, passes through the refractive structure 610 and is refracted above the light board joint 230. The refractive index of the refractive structure 610 gradually decreases along the direction from the back panel 220 to the diffuser plate 500. This refracts light emitted by the lamp beads 213 in other areas directly above the light board joint 230, further supplementing the light of the light board 210 joint. In particular, the light emitted by the lamp beads 213, which would not originally illuminate directly above the photoluminescent structure 300, is now directed directly above the photoluminescent structure 300, thereby increasing the brightness of the light board joint 230.

[0058] Figure 10 is a schematic diagram of a rectangular frame according to an embodiment of the present application. Figure 10 As shown, the rectangular frame 410 of the present application is a detachable rectangular frame 410, which includes four corner frames 411 and at least four strip frames 412. The corner frames 411 are respectively located at the four corners of the rectangular frame 410, and the two ends of the strip frames 412 are respectively detachably connected to the two corner frames 411 located on the same side.

[0059] Through the detachable connection between the corner frame 411 and the strip frame 412, when dealing with display devices 10 of different sizes, it is only necessary to disassemble the strip frame 412 and the corner frame 411, and replace the strip frame 412 of the appropriate size to assemble a suitable lamp board mounting bracket 400, so as to save production costs and improve the utilization rate of the lamp board bracket 400.

[0060] It should be noted that the inventive concept of this application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the various embodiments or technical features are combined, the original technical effects will be enhanced.

[0061] The above content is a further detailed description of the present application in conjunction with specific optional implementation methods, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, they can make several simple deductions or substitutions without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.

Claims

1. A backlight module, comprising a plurality of light panels and a back panel, wherein the plurality of light panels are spliced ​​and arranged on the surface of the back panel, and a light panel splicing seam is formed between two adjacent light panels, characterized in that: The backlight module further includes a photoluminescent structure and a diffusion plate. The diffusion plate is arranged on the side of the light board away from the backboard. The photoluminescent structure is arranged at the seam of the light board to fill in the seam of the light board, and the photoluminescent structure is made of photoluminescent material. The backlight module further includes a light board mounting bracket, the light board mounting bracket including a rectangular frame and at least one branch, the branch being arranged within the rectangular frame and corresponding to the seam of the light board, and the two ends of the branch being respectively connected to the rectangular frame, dividing the rectangular frame into at least two light board mounting slots, the light board being arranged in the light board mounting slots; The rectangular frame and the branches are formed by the photoluminescent structure.

2. The backlight module according to claim 1, wherein: The diffusion plate is provided with a reflective structure, which is opposite to the edge of the light board and reflects the light emitted by the light board toward the photoluminescent structure.

3. The backlight module according to any one of claim 1, wherein: The side of the branch away from the back plate is sunken downward to form a concave structure.

4. The backlight module according to claim 1, wherein: The backlight module further includes a plurality of baffles, the photoluminescent structure includes a plurality of sub-light-emitting structures, the baffles are arranged between two adjacent sub-light-emitting structures, and the distance between two adjacent baffles is equal to the distance between two adjacent lamp beads in the light board; the baffles are made of black light-isolating material; The sub-light-emitting structures are separated by the baffles, so that the brightness of the sub-light-emitting structures in the corresponding areas is only determined by the brightness of the lamp beads on the lamp board in the corresponding areas.

5. The backlight module according to claim 1, wherein: The backlight module further includes a support member, which is disposed between the photoluminescent structure and the diffusion plate. The length of the support member is equal to the length of the light panel seam, and the material of the support member is transparent.

6. The backlight module according to claim 5, wherein: The light boards on both sides of the light board seam are respectively a first light board and a second light board, and the side of the support member close to the first light board and the side close to the second light board are both provided with a refraction structure, and the light emitted by the first light board and the second light board passes through the refraction structure and is refracted above the light board seam; Furthermore, the refractive index of the refractive structure gradually decreases along the direction from the back plate to the diffuser plate.

7. The backlight module according to claim 1, wherein: The rectangular frame includes four corner frames and at least four strip frames. The corner frames are respectively located at the four corners of the rectangular frame. Both ends of the strip frames are detachably connected to the two corner frames located on the same side.

8. A display device, characterized in that: The display device includes a display panel and the backlight module according to any one of claims 1 to 7. The display panel and the backlight module are arranged opposite to each other, and the backlight module provides backlight for the display panel.

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