Disclosure of Invention
The invention provides a direct type backlight module, a direct type backlight module manufacturing method and a display, wherein a diffusion layer directly covering the backlight source is used for replacing a traditional diffusion plate with a cavity between the backlight source and a substrate, the thickness of the direct type backlight module is effectively reduced, and the application range of the direct type backlight module is expanded.
In a first aspect, the present invention provides a direct type backlight module, including:
a substrate;
a backlight mounted on the substrate;
a diffusion layer directly overlying the backlight;
and the diffusion powder is distributed in the diffusion layer.
Preferably, the first and second electrodes are formed of a metal,
the diffusion layer is made of transparent materials.
Preferably, the first and second electrodes are formed of a metal,
the transparent material comprises silica gel or epoxy glue.
Preferably, the first and second electrodes are formed of a metal,
the thickness range of the diffusion layer is 0.1 mm-5 mm.
Preferably, the first and second electrodes are formed of a metal,
the mass ratio of the diffusion powder to the diffusion layer is not more than 10%.
Preferably, the first and second electrodes are formed of a metal,
the diffusion layer is provided with a modeling upper surface.
Preferably, the first and second electrodes are formed of a metal,
the direct type backlight module further comprises:
and the optical film group is arranged on the upper surface of the diffusion layer.
Preferably, the first and second electrodes are formed of a metal,
the direct type backlight module further comprises:
the reflecting sheet is arranged on the substrate and provided with a through hole for mounting the backlight source.
In a second aspect, the present invention provides a method for manufacturing a direct type backlight module according to the first aspect, including:
mounting a backlight on a substrate;
and a diffusion layer with diffusion powder distributed inside is directly covered on the backlight source.
In a third aspect, the present invention provides a display device, including the direct type backlight module according to the first aspect.
The invention provides a direct type backlight module, a manufacturing method thereof and a display, wherein the backlight module comprises a substrate, a backlight source, a diffusion layer and diffusion powder, wherein the backlight source is arranged on the substrate, the diffusion layer directly covers the backlight source, the diffusion powder is distributed in the diffusion layer, and the diffusion powder is used for diffusing light emitted by the backlight source so as to achieve the purpose of uniform light emission. The technical scheme provided by the invention utilizes the diffusion layer directly covered on the backlight source to replace the traditional diffusion plate with a cavity between the diffusion layer and the backlight source and the base plate, thereby effectively reducing the thickness of the direct type backlight module and expanding the application range of the direct type backlight module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail and completely with reference to the following embodiments and accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
In a first aspect, as shown in fig. 1 and fig. 2, the present embodiment provides a direct type backlight module, including:
a substrate 1; a backlight 2 mounted on the substrate 1; a diffusion layer 3 directly covering the backlight 2; and diffusion powder 4 distributed in the diffusion layer 3.
In this embodiment, the diffusion layer 3 directly covers the backlight 2, specifically, there is no cavity between the diffusion layer 3, the backlight 2 and the substrate 1, that is, the diffusion layer 3 covers the side and top surfaces of the backlight 2 (as shown in fig. 1); or there may be a cavity between the diffusion layer 3, the backlight 2 and the substrate 1, or there may be a partial cavity between the diffusion layer 3, the backlight 2 and the substrate 1 as shown in fig. 2, wherein the shape of the cavity is not limited to a curved surface, a plane, a combination thereof, and the like. The diffusion powder 4 distributed in the diffusion layer 3 is used for diffusing the light emitted by the backlight source 2 to achieve the purpose of uniform light emission. That is, in the technical scheme provided by this embodiment, the diffusion layer 3 directly covering the backlight source 2 is used to replace the conventional diffusion plate having a cavity between the diffusion layer and the backlight source 2 and the substrate 1, so that the thickness of the direct-type backlight module is effectively reduced, and the application range of the direct-type backlight module is expanded.
Specifically, the backlight source 2 mentioned in this embodiment includes light sources such as an LED (light emitting diode), a CCFL (cold cathode fluorescent lamp), and the like, and is particularly suitable for a direct-type LED backlight module using the LED as the backlight source, where the LED may be a blue LED, a white LED, a green LED, or the like, and a user may select the light sources according to the actual needs of the user.
In an embodiment of the present invention, the diffusion layer 3 is made of a transparent material, and light emitted from the backlight 2 needs to be transmitted outward through the diffusion layer 3, so that the light transmittance of the diffusion layer 3 needs to be ensured, that is, the transparent material is selected as the diffusion layer, where the transparent material includes materials with high light transmittance, such as PC (polycarbonate), PMMA (polymethyl methacrylate), and the like. Preferably, the transparent material comprises silica gel or epoxy glue, and the silica gel and the epoxy glue have the advantages of certain softness, fluidity, high temperature resistance and the like under the condition of better light transmittance, so that the aim of easy manufacture is fulfilled.
In one embodiment of the present invention, the thickness of the diffusion layer 3 ranges from 0.1 mm to 5 mm, for example, the diffusion layer 3 may be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 2 mm, or 5 mm. The diffusion layer 3 is used for diffusing light in the diffusion layer, so that light emitted by the backlight source 2 is uniform after passing through the diffusion layer 3, and if the thickness of the diffusion layer 3 is small, namely less than 0.1 mm, the light emitted by the backlight source 2 may not be dispersed in the diffusion layer to a sufficient degree, so that the light may still be non-uniform after passing through the diffusion layer. If the thickness of the diffusion layer 3 is larger than 5 mm, the backlight module has a certain thickness, thereby limiting the application range of the backlight module in ultra-thin liquid crystal display devices.
In one embodiment of the present invention, the mass ratio of the diffusion powder 4 to the diffusion layer 3 is not more than 10%, for example, the mass ratio of the diffusion powder 4 to the diffusion layer 3 is 1%, 1.5%, 2%, 5%, 10%, or the like. The diffusion powder 4 can increase the scattering and transmission of light, is the substance that diffuses light in the diffusion layer 3, makes the light become even, soft after passing through the diffusion layer, however the addition of diffusion powder 4 is too big, promptly with the mass ratio of diffusion layer 3 is greater than 10%, can make the diffusion powder be difficult to stir evenly to white point appears in the diffusion layer, hinders the propagation of light, reduces the scattering and the transmission effect of diffusion powder to light, thereby makes the light that continues to propagate from the diffusion layer appear distributing inhomogeneous phenomenon. And according to the characteristics of different light diffusion powders, the use beyond a specific concentration can greatly reduce the light extraction efficiency, which is contrary to the product design in consideration of energy efficiency utilization rate.
In an embodiment of the present invention, the diffusion layer 3 is provided with a shaped upper surface, that is, different patterning processes can be performed on the upper surface of the diffusion layer, as shown in fig. 3, the upper surface of the diffusion layer can be arranged as an array or random arrangement of microstructures with different three-dimensional shapes, and the surface of the diffusion layer is frosted and sandblasted or has a planar pattern, which is beneficial to light extraction and improves light distribution uniformity.
As shown in fig. 4, in an embodiment of the present invention, the direct-type backlight module further includes: the optical film group 5 is disposed on the upper surface of the diffusion layer 3, wherein the optical film group 5 may include a quantum dot film, a brightness enhancement film, a diffusion film, and the like, and may be used to change the color of light emitted from the backlight source, provide the brightness of light, further diffuse the light, and the like, so that the liquid crystal display device may have a better display effect due to the light passing through the optical film group 5.
As shown in fig. 5 and 6, in an embodiment of the present invention, the direct type backlight module further includes: set up in reflector plate 6 on the base plate 1, reflector plate 6 is provided with the through-hole for the installation backlight 2, when backlight 2 is luminous, light can be to propagating all around, consequently has the situation that light shines on base plate 1, increases reflector plate 6 and will shine the light of shining on base plate 1 and reflect on base plate 1 to improve the utilization ratio of light, set up the through-hole at reflector plate 6, when installation backlight 2, pass the through-hole on emitter plate 6, install backlight 2 on base plate 1. When the backlight module is provided with the reflector 6, no cavity exists among the diffusion layer 3, the backlight source 2 and the reflector 6, that is, the diffusion layer 3 covers the side surface and the top surface of the backlight source 2 (as shown in fig. 5); or there may be a cavity between the diffusion layer, the backlight 2 and the substrate 1, as shown in fig. 6, and there may be a partial cavity between the diffusion layer 3, the backlight 2 and the substrate 1, wherein the shape of the cavity is not limited to a curved surface, a plane, a combination thereof, and the like.
In a second aspect, the present embodiment provides a method for manufacturing a direct-type backlight module, including:
mounting a backlight on a substrate;
and the backlight source is directly covered with diffusion layers with diffusion powder inside.
In the embodiment, the diffusion layer directly covered on the backlight source is used for replacing the traditional diffusion plate with a cavity between the backlight source and the substrate, so that the thickness of the direct type backlight module is effectively reduced, and the application range of the direct type backlight module is expanded.
In one possible implementation manner, the transparent silica gel doped with the diffusion powder is directly coated on the backlight source mounted on the substrate to form the direct type backlight module shown in fig. 1; or, a diffusion layer (such as the diffusion layer 4 shown in fig. 2) with a desired configuration is manufactured by using a mold, and diffusion powder is distributed in the diffusion layer, and then the formed diffusion layer is directly covered on a backlight source mounted on a substrate, so as to form the direct type backlight module shown in fig. 6.
In a third aspect, the present embodiment provides a display, including the direct type backlight module according to any of the above embodiments, where the display may be a television display, a computer display, or the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.