Light board, backlight module and display device

Abstract

The present invention provides a light board, a backlight module, and a display device, wherein the light board includes a substrate; a plurality of light sources located on the substrate; and an optical film located on the plurality of light sources; wherein the optical film includes an encapsulation layer and a light-splitting layer and a light-gathering layer located on both sides of the encapsulation layer, the light-splitting layer includes a plurality of groups of first protrusions facing the plurality of light sources, and the light-gathering layer includes a plurality of groups of second protrusions. In the present invention, after the light emitted from the light source undergoes the light-splitting treatment of the light-splitting layer and the light-gathering treatment of the light-gathering layer in sequence, the problem of light shadow shielding can be solved, and at the same time, the brightness of the light emitted by the light source can be ensured not to be reduced too much, and the display requirements can be met, thereby effectively improving the problem of uneven display of the display device prepared using the light board.

Description

Technical Field

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

[0002] Mini LED (miniature light emitting diode) technology holds great potential and has become a key development direction for next-generation display technology. However, the uneven distribution of LEDs across panels can lead to poor image quality, making it more susceptible to uneven display and shadowing. Summary of the Invention

[0003] Embodiments of the present invention provide a lamp board, a backlight module, and a display device to improve the problem of uneven display of a display device manufactured using the lamp board.

[0004] The present invention provides a light board, comprising:

[0005] substrate;

[0006] a plurality of light sources, located on the substrate;

[0007] an optical film, located on the plurality of light sources;

[0008] The optical film includes an encapsulation layer and a light-splitting layer and a light-gathering layer located on both sides of the encapsulation layer. The light-splitting layer includes multiple groups of first protrusions facing the multiple light sources, and the light-gathering layer includes multiple groups of second protrusions.

[0009] In some embodiments of the present invention, the first protrusion is a polygonal pyramid or a protrusion with a cross section in the shape of a concave lens, and the second protrusion is a polygonal pyramid or a protrusion with a cross section in the shape of a convex lens.

[0010] In some embodiments of the present invention, a plurality of diffusion particles are disposed in the encapsulation layer, and the plurality of diffusion particles are evenly distributed and have different particle sizes.

[0011] In some embodiments of the present invention, a support layer is further included between the packaging layer and the substrate. The support layer, the packaging layer and the substrate form a plurality of receiving spaces. At least one of the receiving spaces is provided with a corresponding light source and a corresponding first protrusion.

[0012] In some embodiments of the present invention, the supporting layer includes a plurality of reflecting portions for reflecting light from a plurality of the light sources.

[0013] In some embodiments of the present invention, at least one of the reflecting portions includes a first surface close to the packaging layer, a second surface close to the substrate, and an outer side surface and an inner side surface connected between the first surface and the second surface and arranged opposite to each other, and the inner side surface is arranged at an angle relative to the second surface.

[0014] In some embodiments of the present invention, the setting of the reflecting part must meet the following conditions: B<A / 2, B≥C, arctanα=(BC) / D≥0.5; wherein, A is the distance between the contour lines of the outer side surfaces of the reflecting part under the longitudinal cross-sectional perspective, B is the width of the second surface of the reflecting part under the longitudinal cross-sectional perspective, C is the width of the first surface of the reflecting part under the longitudinal cross-sectional perspective, D is the height of the reflecting part under the longitudinal cross-sectional perspective, and α is the angle between the inner side surface of the reflecting part and the first surface under the longitudinal cross-sectional perspective.

[0015] In some embodiments of the present invention, the encapsulation layer, the light-gathering layer, and the light-splitting layer are an integrally formed structure.

[0016] An embodiment of the present invention further provides a backlight module, comprising the aforementioned light board.

[0017] An embodiment of the present invention further provides a display device including the aforementioned backlight module.

[0018] In the lamp board provided in the embodiment of the present invention, the light emitted from the light source is sequentially subjected to the light-splitting processing of the light-splitting layer and the light-focusing processing of the light-focusing layer, which can not only solve the problem of light shadow shielding, but also ensure that the brightness of the light emitted by the light source will not be reduced too much, and can meet the display requirements, thereby effectively improving the problem of uneven picture display of the display device prepared by using the lamp board. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a cross-sectional schematic diagram of a light panel provided by an embodiment of the present invention;

[0021] Figure 2 is another cross-sectional schematic diagram of a light panel provided by an embodiment of the present invention;

[0022] Figure 3 is a cross-sectional schematic diagram of a receiving space provided by an embodiment of the present invention;

[0023] Figure 4 It is another cross-sectional schematic diagram of the accommodation space provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] Furthermore, it should be understood that the specific embodiments described herein are intended only to illustrate and explain the present invention and are not intended to limit the present invention. In the present invention, unless otherwise indicated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of a device in actual use or operation, specifically the directions of the drawings in the accompanying drawings; whereas "inner" and "outer" refer to the outline of the device.

[0026] like Figure 1 As shown, the present invention provides a light board, comprising: a substrate 10; a plurality of light sources 20, located on the substrate 10; an optical film 30, located on the plurality of light sources 20; wherein the optical film 30 comprises an encapsulation layer 301 and a light-splitting layer 302 and a light-gathering layer 303 located on both sides of the encapsulation layer 301, the light-splitting layer 302 comprises a plurality of groups of first protrusions 302a facing the plurality of light sources 20, and the light-gathering layer 303 comprises a plurality of groups of second protrusions 303a.

[0027] Among them, such as Figure 1 As shown, a plurality of the light sources 20 are arranged on the substrate 10, and the spectroscopic layer 302 is located above the light source 20, for receiving the light emitted by the light source 20 and dispersing it. The spectroscopic layer 302 is located on the side of the packaging layer 301 close to the substrate, and the focusing layer 303 is provided on the other side of the packaging layer 301 away from the substrate 10, and the focusing layer 303 is used to gather the light dispersed by the spectroscopic layer 302.

[0028] Specifically, the light-splitting layer 302 includes multiple groups of first protrusions 302a, which are used to disperse the light emitted by the light source 20. The light-gathering layer 303 includes multiple groups of second protrusions 303a, which are used to gather the light. The positions occupied by the multiple groups of first protrusions 302a on one side of the encapsulation layer 301 correspond to the positions occupied by the multiple groups of second protrusions 303a on the other side of the encapsulation layer 301, and the surface area of ​​the encapsulation layer 301 occupied by the multiple groups of first protrusions 302a on one side of the encapsulation layer 301 is the same as the surface area of ​​the encapsulation layer 301 occupied by the multiple groups of second protrusions 303a on the other side of the encapsulation layer 301.

[0029] Preferably, in this embodiment, the encapsulation layer 301 , the light-splitting layer 302 and the light-gathering layer 303 are made of the same material, and have the same refractive index.

[0030] In this embodiment, the light emitted from the light source 20 enters the light-splitting layer 302 through the air. Since the light-splitting layer 302 is provided with a plurality of first protrusions 302a facing the light source 20, the plurality of first protrusions 302a can disperse the light into multiple beams of light, and the multiple beams of light pass through the encapsulation layer 301 and enter the light-gathering layer 303. Since the light-gathering layer 303 is provided with a plurality of second protrusions 303a, the multiple beams of light can be focused after entering the light-gathering layer 303. Therefore, the light emitted from the light source 20 can solve the problem of light shadow shielding after passing through the light-splitting processing of the light-splitting layer 302 and the light-gathering processing of the light-gathering layer 303 in turn, and at the same time, it can ensure that the brightness of the light emitted by the light source 20 will not be reduced too much, and can meet the display requirements, thereby effectively improving the problem of uneven display of the display device prepared by using the lamp board.

[0031] Preferably, the light source 20 is an LED lamp.

[0032] The first protrusion 302a is a polygonal pyramid or a protrusion with a cross section in the shape of a concave lens, and the second protrusion 303a is a polygonal pyramid or a protrusion with a cross section in the shape of a convex lens.

[0033] In this embodiment, the first protrusion 302a is used to disperse the light emitted by the light source 20. When the first protrusion 302a is a polygonal pyramid (for example, a square pyramid or a hexagonal pyramid) or a protrusion with a cross-section in the shape of a concave lens, it can have the effect of dispersing the light. The second protrusion 303a is used to focus the light emitted by the light source 20. When the second protrusion 303a is a polygonal pyramid (for example, a square pyramid or a hexagonal pyramid) or a protrusion with a cross-section in the shape of a convex lens, it can have the effect of focusing the light.

[0034] Furthermore, if Figure 2 As shown, a plurality of diffusion particles 301 a are disposed in the encapsulation layer 301 , and the plurality of diffusion particles 301 a are evenly distributed and have different particle sizes.

[0035] In this embodiment, the diffusion particles 301a are provided in the encapsulation layer 301. The diffusion particles 301a have different particle sizes and are evenly distributed in the encapsulation layer 301. When the light emitted by the light source 20 is dispersed into multiple beams of light at the spectroscopic layer 302 and then enters the encapsulation layer 301, since the diffusion particles 301a of different particle sizes are evenly distributed in the encapsulation layer 301, the light entering the encapsulation layer 301 encounters the diffusion particles 301a during the propagation process and undergoes secondary dispersion on the surface of the diffusion particles 301a, thereby making the light emitted from the light source 20 become more dispersed light.

[0036] Afterwards, the light after secondary dispersion enters the light-collecting layer 303 . Since the light-collecting layer 303 is provided with the second protrusions 303 a for collecting light, the light after secondary dispersion is collected by the second protrusions 303 a .

[0037] Compared with the aforementioned method of making the light emitted by the light source 20 pass through the splitting treatment of the splitting layer 302 and the focusing treatment of the focusing layer 303 in sequence, thereby solving the problem of lamp shadow shielding of the lamp board, and at the same time, it can ensure that the brightness of the light emitted by the light source 20 will not be reduced too much and can still meet the display requirements. In this embodiment, the diffusion particles 301a are added to the encapsulation layer 301, wherein the diffusion particles 301a can be inorganic diffusion particles or organic diffusion particles. The diffusion particles 301a dispersed in the encapsulation layer 301 can achieve secondary dispersion processing of the light after the dispersion processing by the splitting layer 302, which is equivalent to using the original encapsulation layer 301 as the second splitting layer, and the light after the secondary dispersion processing has a better dispersion effect. Therefore, based on the aforementioned scheme, this embodiment can better solve the problem of lamp shadow shielding, and at the same time, ensure that the brightness of the light emitted by the light source 20 will not be reduced too much, and can meet the display requirements, thereby effectively improving the problem of uneven display of the display device prepared using the lamp board.

[0038] In this example, please continue to refer to Figure 3 and Figure 4 , further comprising the supporting layer 40 located between the encapsulation layer 301 and the substrate 10, wherein the supporting layer 40, the encapsulation layer 301 and the substrate 10 form a plurality of receiving spaces, and at least one of the receiving spaces is provided with the corresponding light source 20 and the corresponding first protrusion 302a.

[0039] It can be understood that in this embodiment, the distance between the encapsulation layer 301 and the substrate 10 is maintained by the support layer 40. In one of the receiving spaces, the light source 20 is provided on a side close to the substrate 10, and the light source 20 is located in the middle of the bottom of the receiving space. The first protrusion 302a is located directly above the light source 20 and occupies part or all of the area at the top of the receiving space. Specifically, Figure 3 The cross-sectional structure of a single receiving space is shown in FIG. 1 , wherein it should be noted that a single or multiple light sources 20 may be provided in the receiving space, and the number of the corresponding first protrusions 302a provided is also not limited. Figure 3 The number of the light sources 20 to be arranged in the receiving space and the number of the first protrusions 302a arranged in the receiving space can be changed according to the actual preparation requirements of the light board.

[0040] Specifically, the supporting layer 40 includes multiple reflecting parts 401 for reflecting light from multiple light sources 20, and at least one of the reflecting parts 401 includes a first surface 401a close to the encapsulation layer 301, a second surface 401b close to the substrate 10, and an inner side surface 401c and an outer side surface 401d connected between the first surface 401a and the second surface 401b and arranged opposite to each other, and the inner side surface 401c is arranged at an angle relative to the second surface 401b.

[0041] In this embodiment, the supporting portion 40 includes a plurality of reflecting portions 401, which are evenly distributed in the space between the encapsulation layer 301 and the substrate 10, and support the encapsulation layer 301. Since the light emitted by the light source 20 needs to be dispersed by the first protrusion 302a and gathered by the second protrusion 303a, the loss of light emitted by the light source 20 needs to be minimized in the receiving space.

[0042] The reflective portion 401 includes a first surface 401a close to the encapsulation layer 301, a second surface 401b close to the substrate 10, and an inner side surface 401c and an outer side surface 401d connected to and opposite to the first surface 401a and the second surface 401b. Figure 3 As can be seen in the figure, the first surface 401a is in contact with the encapsulation layer 301, and the second surface 401b is in contact with the substrate 10. Therefore, the first surface 401a and the second surface 401b do not affect the light emitted by the light source 20, while the inner surface 401c and the outer surface 401d do affect the light emitted by the light source 20. In this embodiment, the inner surface 401c is preferably tilted relative to the second surface 401b. Therefore, the light emitted by the light source 20 is reflected on the inner surface 401c and enters the light-splitting layer 302 at a certain angle.

[0043] Specifically, the setting of the reflecting part 401 must meet the following conditions: B<A / 2, B≥C, arctanα=(BC) / D≥0.5; wherein, A is the distance between the contour lines of the outer side surface 401d of the reflecting part 401 from the longitudinal cross-sectional perspective, B is the width of the second surface 401b of the reflecting part 401 from the longitudinal cross-sectional perspective, C is the width of the first surface 401a of the reflecting part 401 from the longitudinal cross-sectional perspective, D is the height of the reflecting part 401 from the longitudinal cross-sectional perspective, and α is the angle between the inner side surface 401c of the reflecting part 401 and the first surface 401a from the longitudinal cross-sectional perspective.

[0044] In this embodiment, the structure of the reflective portion 401 is limited by the above conditions so that the light emitted by the light source 20 can enter the light-splitting layer 302 as much as possible for dispersion processing, thereby reducing the loss of the light emitted by the light source 20 in the receiving space.

[0045] Furthermore, in this embodiment, the encapsulation layer 301 , the light-splitting layer 302 and the light-collecting layer 303 are an integrally formed structure.

[0046] In this embodiment, by designing the encapsulation layer 301, the light-splitting layer 302 and the light-gathering layer 303 as an integrally formed structure, it is helpful to simplify the preparation process of the lamp board. For example, a laser engraving machine can be used to engrave the first protrusion 302a of the light-splitting layer 302 and the second protrusion 303a of the light-gathering layer 303 on a hot pressing mold, and then transfer them to the encapsulation layer 301 when the encapsulation layer 301 is formed, thereby achieving the arrangement of the light-splitting layer 302 and the light-gathering layer 303 on both sides of the encapsulation layer 301.

[0047] An embodiment of the present invention further provides a backlight module, comprising the aforementioned light board.

[0048] Furthermore, an embodiment of the present invention also provides a display device including the aforementioned backlight module.

[0049] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A light board, characterized in that: include: substrate; a plurality of light sources, located on the substrate; an optical film, located on the plurality of light sources; The optical film includes an encapsulation layer and a light-splitting layer and a light-gathering layer located on both sides of the encapsulation layer, the light-splitting layer includes multiple groups of first protrusions facing the multiple light sources, and the light-gathering layer includes multiple groups of second protrusions; The light board further includes: a support layer located between the packaging layer and the substrate, wherein the support layer, the packaging layer, and the substrate enclose a plurality of receiving spaces, the plurality of receiving spaces being arranged at intervals, and at least one of the receiving spaces being provided with a corresponding light source and a corresponding first protrusion; The supporting layer includes a plurality of reflecting parts for reflecting light from the plurality of light sources; At least one of the reflective portions includes a first surface close to the encapsulation layer, a second surface close to the substrate, and an outer side surface and an inner side surface connected between the first surface and the second surface and opposite to each other, wherein the inner side surface is inclined relative to the second surface; The setting of the reflecting part must meet the following conditions: B<A / 2, B≥C, arctanα=(BC) / D≥0.5; wherein, A is the distance between the contour lines of the outer side surfaces of the reflecting part under the longitudinal cross-sectional perspective, B is the width of the second surface of the reflecting part under the longitudinal cross-sectional perspective, C is the width of the first surface of the reflecting part under the longitudinal cross-sectional perspective, D is the height of the reflecting part under the longitudinal cross-sectional perspective, and α is the angle between the inner side surface of the reflecting part and the first surface under the longitudinal cross-sectional perspective.

2. The light board according to claim 1, characterized in that: The first protrusion is a polygonal pyramid or a protrusion with a cross section in the shape of a concave lens, and the second protrusion is a polygonal pyramid or a protrusion with a cross section in the shape of a convex lens.

3. The light board according to claim 1, characterized in that: A plurality of diffusion particles are arranged in the encapsulation layer. The plurality of diffusion particles are evenly distributed and have different particle sizes.

4. The light board according to claim 1, characterized in that: The encapsulation layer, the light-gathering layer and the light-splitting layer are an integrally formed structure.

5. A backlight module, characterized in that: The invention comprises the light board described in any one of claims 1 to 4.

6. A display device, characterized in that: Including the backlight module described in claim 5.

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