Direct type backlight module

Abstract

The utility model discloses a direct type backlight module which comprises a plurality of backlight assemblies, and the backlight assemblies are spliced to form the backlight module. The backlight assembly comprises a backlight source, a diaphragm, a lens unit, a Fresnel lens unit and a shielding frame, the diaphragm is arranged between the backlight source and the Fresnel lens unit, the lens unit is arranged in the center of the diaphragm, and the shielding plate is arranged at the end of the same side of the backlight source, the diaphragm and the Fresnel lens unit. The backlight module has the advantages that the light mixing distance is reduced through the combination of the backlight source, the lens unit and the Fresnel lens unit, the display effect is improved, the requirement for backlight uniformity is met, meanwhile, a small light divergence angle is achieved, the aberration of an optical part can be reduced through the small light divergence angle, the image quality is improved, and the display effect is improved. And a plurality of backlight assemblies are spliced to form the direct type backlight module, so that the backlight size is further enlarged, and the backlight display requirement of a large-size display panel is met.

Description

Technical Field

[0001] The utility model relates to the technical field of direct-type backlight modules, in particular to a direct-type backlight module. Background Art

[0002] In the field of large-size backlit displays, backlight technology has always been one of the most important key technologies. Traditional LCD backlight systems usually adopt an edge-entry structure, that is, the light source enters from the side of the display panel and is then evenly distributed through components such as reflection or light guide plates to achieve brightness and uniformity of the display screen. However, using a light guide plate to guide light, especially on large-size display panels, may cause brightness loss, thereby reducing the energy efficiency and overall performance of the display panel and affecting the viewing experience. Utility Model Content

[0003] The technical problem to be solved by the utility model is how to meet the backlight display requirements of large-size display panels.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] A direct-type backlight module comprises a plurality of backlight components, wherein the plurality of backlight components are spliced ​​to form a backlight module;

[0006] The backlight assembly includes a backlight source, an aperture, a lens unit, a Fresnel lens unit, and a shielding frame. The aperture is arranged between the backlight source and the Fresnel lens unit. The lens unit is arranged at the center of the aperture. The shielding plate is arranged at the same side end of the backlight source, the aperture, and the Fresnel lens unit.

[0007] The combination of backlight source, lens unit and Fresnel lens unit reduces the light mixing distance, improves the display effect, and achieves a smaller light divergence angle while meeting the backlight uniformity. The smaller light divergence angle can reduce the aberration of the optical part and improve the image quality. By splicing multiple backlight components to form a direct-type backlight module, the backlight size is further expanded to meet the backlight display requirements of large-size display panels.

[0008] Preferably, the backlight source is an LED light source.

[0009] Preferably, the lens unit is a plano-convex lens, a bi-convex lens or a meniscus lens.

[0010] Preferably, the refractive index of the lens unit is 1.48-1.8.

[0011] Preferably, the lens unit is made of glass or resin.

[0012] Preferably, the Fresnel surface of the Fresnel lens unit is arranged away from the lens unit.

[0013] Preferably, the Fresnel surface of the Fresnel lens unit is an aspherical surface or a spherical surface.

[0014] Preferably, the surfaces of the aperture and the shielding frame are coated with a layer of black light-absorbing material.

[0015] Preferably, the centers of the backlight source, the lens unit and the Fresnel lens unit are on the same straight line.

[0016] Preferably, the distance between the lens unit and the Fresnel lens is greater than the distance between the backlight source and the lens unit.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The combination of backlight source, lens unit and Fresnel lens unit reduces the light mixing distance, improves the display effect, and achieves a smaller light divergence angle while meeting the backlight uniformity. The smaller light divergence angle can reduce the aberration of the optical part and improve the image quality. By splicing multiple backlight components to form a direct-type backlight module, the backlight size is further expanded to meet the backlight display requirements of large-size display panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of a backlight assembly in Embodiment 1 of the utility model;

[0021] Figure 3 It is a structural schematic diagram of a backlight assembly according to a second embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to facilitate those skilled in the art to understand the technical solution of the utility model, the technical solution of the utility model is further explained in conjunction with the drawings in the specification.

[0023] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying opposite importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically limited.

[0025] Embodiment 1

[0026] See also Figure 1 and Figure 2 This embodiment discloses a direct-type backlight module, including a plurality of backlight components 1, and the plurality of backlight components 1 are spliced ​​to form a backlight module.

[0027] The backlight assembly 1 includes a backlight light source 11, an aperture 12, a lens unit 13, a Fresnel lens unit 14, and a shielding frame 15. The aperture 12 is arranged between the backlight light source 11 and the Fresnel lens unit 14. The lens unit 13 is arranged at the center of the aperture 12. The distance between the lens unit 13 and the Fresnel lens 14 is greater than the distance between the backlight light source 11 and the lens unit 13, and the ratio is not less than 15; the shielding frame 15 is arranged at the same side end of the backlight light source 11, the aperture 12, and the Fresnel lens unit 14. The adjacent backlight assemblies 1 are shielded by the shielding frame 15 to avoid light crosstalk between the backlight assemblies 1 and improve the backlight uniformity.

[0028] The center spacing between the backlight light sources 11, the center spacing between the lens units 13 and the center spacing between the Fresnel lens units 14 are all equal, and the ratio of the spacing between the backlight light sources 11 and the Fresnel lens units 14 to the width of the Fresnel lens units 14 is not greater than 1.2.

[0029] The backlight source 11 is an LED light source.

[0030] The aperture 12 is located at the plane position of the lens unit 13. The light-transmitting area of ​​the aperture 12 is circular in shape with an aperture of 11 mm. The material of the aperture 12 is PC, and a black light-absorbing material layer is coated on the surface.

[0031] The lens unit 13 is a plano-convex lens or a biconvex lens or a meniscus lens. The concave and convex surfaces of the lens unit 13 can be spherical or aspherical. In the present embodiment, the lens unit 13 is a plano-convex lens with positive focal length, and its concave and convex surfaces are aspherical. The convex surface of the lens unit 13 faces away from the backlight source 11, and the convex surface of the lens unit 13 is a quadratic surface. The lens unit 13 is a two-dimensional lens unit, and the focal length of the lens unit 13 is 29.7 mm. The lens unit 13 is made of glass or resin. The refractive index of the lens unit 13 is 1.48-1.8, and in the present embodiment, the refractive index is 1.52.

[0032] The Fresnel lens unit 14 includes a plane and a tooth surface, wherein the tooth surface is a Fresnel surface, the Fresnel surface of the Fresnel lens unit 14 is away from the lens unit 13, and the plane is located on the other side. The focal length of the Fresnel lens unit 14 is 56.87 mm, the Fresnel lens unit 14 is a two-dimensional lens unit, the material of the Fresnel lens unit 17 is PMMA, and further, the refractive index of the Fresnel lens unit 14 is 1.49; the shape of the Fresnel lens unit 14 is square, and the diameter is 45 mm*45 mm.

[0033] The Fresnel lens unit 14 can further converge the light passing through the lens unit 13 and achieve uniform output of the light, thereby improving the display effect.

[0034] The shielding frame 15 is a frame structure with partitions.

[0035] The shielding frame material may be a PC, ABS material or the like, and a black light absorbing material layer is coated on the surface thereof.

[0036] Compared with the prior art, the backlight assembly 1 proposed in this embodiment reduces the light mixing distance and improves the display effect through the combination of the backlight light source 11, the lens unit 13, and the Fresnel lens unit 14, while meeting the backlight uniformity and achieving a smaller light divergence angle. The smaller light divergence angle can reduce the aberration of the optical part and improve the image quality. By splicing multiple backlight assemblies 1 to form a direct-type backlight module, the backlight size is further expanded to meet the backlight display requirements of large-size display panels.

[0037] Embodiment 2

[0038] See also Figure 3 The present embodiment is different from the first embodiment in that the lens unit 13 in the present embodiment is a meniscus lens with positive focal length, the concave and convex surfaces of the lens unit 13 are both quadratic surfaces, and the focal length of the lens unit 13 is 5.9 mm.

[0039] The aperture 12 is located at the concave surface of the lens unit 13 , and the light-transmitting area of ​​the aperture 12 is circular in shape with a diameter of 5 mm.

[0040] The Fresnel surface of the Fresnel lens unit 14 faces the lens unit 13, and the flat surface faces away from the lens unit 13. The focal length of the Fresnel lens unit 14 is 52.9 mm. The shape of the Fresnel lens unit 14 is square, and the aperture is 34 mm*34 mm.

[0041] Compared with the first embodiment, the backlight module of this embodiment is smaller in size and has better backlight collimation.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0043] The above-described embodiments merely represent implementation methods of the utility model, and the protection scope of the utility model is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the utility model, and all of these belong to the protection scope of the utility model.

Claims

1. A direct-type backlight module, characterized in that: It includes a plurality of backlight components, and the plurality of backlight components are spliced ​​to form a backlight module; The backlight assembly includes a backlight source, an aperture, a lens unit, a Fresnel lens unit, and a shielding frame. The aperture is arranged between the backlight source and the Fresnel lens unit, a lens unit is arranged at the center of the aperture, and the shielding frame is arranged at the same side end of the backlight source, the aperture, and the Fresnel lens unit.

2. The direct-lit backlight module according to claim 1, characterized in that: The backlight source is an LED light source.

3. The direct-lit backlight module according to claim 1, characterized in that: The lens unit is a plano-convex lens, a biconvex lens or a meniscus lens.

4. The direct-lit backlight module according to claim 1, characterized in that: The refractive index of the lens unit is 1.48-1.

8.

5. The direct-lit backlight module according to claim 1, characterized in that: The lens unit is made of glass or resin.

6. The direct-lit backlight module according to claim 1, characterized in that: The Fresnel surface of the Fresnel lens unit is arranged away from the lens unit.

7. The direct-lit backlight module according to claim 1, characterized in that: The Fresnel surface of the Fresnel lens unit is an aspherical surface or a spherical surface.

8. The direct-lit backlight module according to claim 1, characterized in that: The surfaces of the aperture and the shielding frame are both coated with a black light absorbing material layer.

9. The direct-lit backlight module according to claim 1, characterized in that: The centers of the backlight source, the lens unit and the Fresnel lens unit are on the same straight line.

10. The direct-lit backlight module according to claim 1, characterized in that: The distance between the lens unit and the Fresnel lens is greater than the distance between the backlight source and the lens unit.

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