Lens structure, multi-curve controlled silica gel lens and direct type backlight module

Abstract

The utility model provides a lens structure, a multi-curve controlled silica gel lens and a direct type backlight module, the lens structure comprises a seat body and a lens body, the lens body is arranged on the seat body and is provided with a concave accommodating cavity, the bottom surface of the accommodating cavity is a light-in surface, the outer surface of the lens body opposite to the light-in surface is a light-out surface, the light-in surface comprises an A-level surface and a B-level surface, and the B-level surface comprises an A-level surface and a B-level surface. The A-level face and the B-level face are arranged at intervals in the circumferential direction and connected, the curve of the longitudinal section of the light-emitting face corresponds to the curve of the section of the light-in face, the face type of the A-level face conforms to the formula # imgabs0 # and the face type of the B-level face conforms to the formula # imgabs1 # imgabs2 #, the light-emitting uniformity of light rays is improved through multi-curve control, the light rays sequentially pass through the light-in face and the light-emitting face of the mirror body through the containing cavity to be refracted, and the light-emitting face and the light-out face of the mirror body sequentially pass through the light-in face and the light-out face of the mirror body. Rotation is designed to form curves in multiple directions of the A-level surface and the B-level surface, the brightness of light is controlled by accurately controlling the light intensity in multiple directions, a visual effect with good uniformity is easy to form when light is emitted from the lens, and the uniformity of TV backlight is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of backlight lenses, and in particular to a lens structure, a multi-curve controlled silicone lens and a direct-down backlight module. Background Art

[0002] With the development of display device manufacturing technology, the display quality requirements of display devices are getting higher and higher, and display devices also need to be made thinner and thinner. Liquid crystal displays are commonly used display devices. Their liquid crystal panels cannot emit light directly, and a backlight module needs to be set to provide light source.

[0003] Backlight modules can generally be divided into edge-entry backlight modules and direct-type backlight modules. The light source of the edge-entry backlight module is set on the side of the panel, and the light enters from the side, while the light source of the direct-entry backlight module is located on the back of the panel, and the light is emitted directly. Compared with the edge-entry backlight module, the direct-entry backlight module can make the display panel have higher brightness and better display effect as a whole, and is especially suitable for large-size display devices.

[0004] In the prior art, the light incident surface or light emitting surface of the backlight lens is formed by rotating a regular arc curve through a rotation axis. There are fewer curves for controlling light and the ability to control the direction of light is weak. It is necessary to increase the thickness of the diffusion plate or set an optical film to control the optical effect. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present application provides a lens structure, a multi-curve controlled silicone lens and a direct-type backlight module.

[0006] A lens structure disclosed in the present application includes: a base body and a mirror body, wherein the mirror body is arranged on the base body, and has an inwardly concave accommodating cavity, wherein the bottom surface of the accommodating cavity is a light incident surface, and the outer surface of the mirror body opposite to the light incident surface is a light emitting surface, wherein the light incident surface includes an A-level surface and a B-level surface, wherein the A-level surface and the B-level surface are arranged at intervals along the circumferential direction, and the A-level surface and the B-level surface are connected, wherein the curve of the longitudinal section of the light emitting surface corresponds to the curve of the section of the light incident surface, and the surface shape of the A-level surface complies with the formula: Class B surface shape follows the formula: Among them, c is the curvature of the vertex of the surface, k is the quadratic aspheric coefficient, r is the radial coordinate, z is the axial coordinate, and a1, a2, a3... are the aspheric coefficients.

[0007] Preferably, the top surface of the mirror body is provided with multiple circles of first annular protrusions, which are arranged in sequence from the center of the top of the mirror body to the edge of the top of the mirror body, and the angle between the top surface of the first annular protrusion and the plane where the top surface of the base body is located is α, and the angle α gradually increases from the center of the top of the mirror body to the edge of the top of the mirror body.

[0008] Preferably, multiple circles of second annular protrusions are provided at the bottom of the mirror body, and the multiple circles of second annular protrusions are arranged in sequence from the periphery of the accommodating cavity to the edge of the bottom of the mirror body. The angle between the bottom surface of the second annular protrusion and the plane where the top surface of the seat body is located is β, and the angle β gradually decreases from the center of the bottom of the mirror body to the edge of the bottom of the mirror body.

[0009] Preferably, the A-level surfaces are symmetrically arranged along the diameter direction of the mirror body.

[0010] Preferably, the cross section of the seat body is square.

[0011] Preferably, the cross section of the seat body is circular.

[0012] Preferably, the cross section of the seat body is elliptical.

[0013] Preferably, the periphery of the cross-section of the seat body is a closed free curve.

[0014] According to another aspect of the utility model, a multi-curve controlled silicone lens disclosed in the present application includes a lens structure.

[0015] According to another aspect of the utility model, a direct-type backlight module disclosed in the present application includes a silicone lens with multi-curve control.

[0016] The beneficial effects of the present application are: improving the uniformity of light output through multi-curve control, the light is refracted through the light incident surface and the light output surface of the mirror body in turn through the accommodating cavity, the design is rotated to form curves in multiple directions of the A-level surface and the B-level surface, and the light intensity in multiple directions is accurately controlled to control the brightness of the light. The light output of the lens can easily form a visual effect with good uniformity, thereby improving the uniformity of the TV backlight. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 This is one of the three-dimensional diagrams of the lens structure in the embodiment;

[0019] Figure 2 This is the second stereoscopic diagram of the lens structure in the embodiment;

[0020] Figure 3 A top view of the lens structure in the embodiment;

[0021] Figure 4 for Figure 3 Section view of the mid-section AA;

[0022] Figure 5 for Figure 3 Section view of the middle section BB;

[0023] Figure 6 for Figure 3 Magnified view of area C in the middle;

[0024] Figure 7 for Figure 3 Magnified view of area D in center.

[0025] Reference numerals:

[0026] 1-base body; 2-mirror body;

[0027] 20-accommodating cavity; 21-light incident surface; 22-light emitting surface; 23-first annular protrusion; 24-second annular protrusion; 25-angle α; 26-angle β; 31-A-level surface; 32-B-level surface; 311-first standard curve; 312-second standard curve; 321-first free curve; 322-second free curve. DETAILED DESCRIPTION

[0028] The following will disclose multiple embodiments of the present application with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present application. In other words, in some embodiments of the present application, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0029] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, in the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present application. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0031] In order to further understand the application content, features and effects of the present application, the following embodiments are cited and described in detail with reference to the accompanying drawings.

[0032] Embodiment 1

[0033] See also Figure 1 and Figure 2 , Figure 1 This is one of the three-dimensional diagrams of the lens structure. Figure 2 This is the second stereoscopic diagram of the lens structure. The lens structure in this example includes a base 1 and a lens body 2. The base 1 is used to carry the lens body 2, and the lens body 2 is used to refract light.

[0034] Please also read Figure 3 , Figure 4 and Figure 5 , Figure 3 is the top view of the lens structure. Figure 4 for Figure 3 Section view of the mid-section AA, Figure 5 for Figure 3 The cross-sectional view of the middle section BB, wherein the mirror body 2 is arranged on the base body 1, and the bottom of the mirror body 2 has a concave accommodating cavity 20, the bottom surface of the accommodating cavity 20 is the light incident surface 21, and the outer surface of the mirror body 2 opposite to the light incident surface 21 is the light emitting surface 22, the light incident surface 21 includes an A-level surface 31 and a B-level surface 32, the A-level surface 31 and the B-level surface 32 are arranged at intervals along the circumferential direction, and the A-level surface 31 and the B-level surface 32 are connected, the curve of the longitudinal section of the light emitting surface 22 corresponds to the curve of the section of the light incident surface 21, and the surface shape of the A-level surface 31 complies with the formula: Class B 32 face type follows the formula: Among them, c is the curvature of the vertex, that is, the inverse of the radius, k is the quadratic aspheric coefficient, and r is the radial coordinate, that is, r 2 =x 2 +y 2 , z is the axial coordinate, a1 and a2 are the aspheric coefficients.

[0035] In this example, the A-level surface 31 of the light incident surface 21 is formed by rotating the first standard curve 311, the B-level surface 32 of the light incident surface 21 is formed by rotating the first free curve 321, the A-level surface 31 of the light exiting surface 22 is formed by rotating the second standard curve 312, and the B-level surface 32 of the light exiting surface 22 is formed by rotating the second free curve 322. The two curves obtained by cutting the light incident surface 21 at 0° & 180° of the radial longitudinal section of the mirror body 2 are two symmetrical first free curves 321, and the two curves obtained by cutting the light incident surface 21 at 90° & 270° of the radial longitudinal section of the mirror body 2 are also two symmetrical first free curves 321, that is, the mirror body 2 is provided with B-level surfaces 32 all around, the A-level surface 31 and the B-level surface 32 are cross-arranged, and the A-level surface 31 and the B-level surface 32 are smoothly transitioned and connected, and the smooth transition can be geometric continuity or parametric continuity, at the radial longitudinal section of the same angle.

[0036] In this way, the uniformity of light emission is improved by setting up multi-curve control. The light is refracted through the light incident surface 21 and the light emitting surface 22 of the mirror body 2 in turn through the accommodating cavity 20. The design is rotated to form curves in multiple directions of the A-level surface 31 and the B-level surface 32. The intensity of light in multiple directions is accurately controlled to control the brightness of the light. The light output of the lens can easily form a visual effect with good uniformity, thereby improving the uniformity of the TV backlight.

[0037] Please also read Figure 6 , Figure 6 for Figure 3 An enlarged view of the middle C area, further, the top surface of the mirror body 2 is provided with a plurality of circles of first annular protrusions 23, and the plurality of circles of first annular protrusions 23 are sequentially arranged along the center of the top of the mirror body 2 to the edge of the top of the mirror body 2, and the angle between the top surface of the first annular protrusion 23 and the plane where the top surface of the base body 1 is located is α, and the angle α25 gradually increases from the center of the top of the mirror body 2 to the edge of the top of the mirror body 2.

[0038] Specifically, the multi-circle first annular protrusion 23 on the top surface of the mirror body 2 is a nanometer-level or micrometer-level structure, and the cross-section of the first annular protrusion 23 is serrated, that is, a Fresnel structure. The base body 1 is arranged along a horizontal plane, and the top surface of the base body 1 is parallel to the horizontal plane. The top surface of the first annular protrusion 23 is a plane. Along the longitudinal section of the mirror body 2, the angle between the top surface of the first annular protrusion 23 and the horizontal plane is α.

[0039] In this way, the brightness of the top of the lens is adjusted by adjusting the angle α25 between the first annular protrusion 23 and the plane where the top surface of the base body 1 is located. When the angle α25 increases, the brightness of the top of the lens body 2 decreases, and when the angle α25 decreases, the brightness of the top of the lens body 2 increases. The light at the center and the surroundings is dispersed while the center brightness is reduced, making the light spot uniform.

[0040] Please also read Figure 7 , Figure 7 for Figure 3 An enlarged view of the middle D area shows that, further, a plurality of circles of second annular protrusions 24 are provided at the bottom of the mirror body 2, and the plurality of circles of second annular protrusions 24 are sequentially arranged from the periphery of the accommodating cavity 20 to the edge of the bottom of the mirror body 2, and an angle β is formed between the bottom surface of the second annular protrusion 24 and the plane where the top surface of the base body 1 is located, and the angle β26 gradually decreases from the center of the bottom of the mirror body 2 to the edge of the bottom of the mirror body 2.

[0041] Specifically, the multiple circles of second annular protrusions 24 at the bottom of the mirror body 2 are nanometer-level or micrometer-level structures, and the cross-section of the second annular protrusions 24 is serrated, that is, a Fresnel structure. The bottom surface of the second annular protrusions 24 is a plane, and along the longitudinal section of the mirror body 2, the angle between the bottom surface of the second annular protrusions 24 and the horizontal plane is β.

[0042] In this way, a Fresnel structure is added to the bottom, and the bottom structure of the lens is adjusted by adjusting the angle β26 between the second annular protrusion 24 and the plane where the top surface of the base body 1 is located. The angle β26 is reduced, the brightness of the light spot of the mirror body 2 is reduced, and the angle β26 is increased to increase the utilization rate of light. The light hits the Fresnel and is reflected out, and then collected again by the light-emitting free surface for light effect. The brightness of the light spot of the mirror body 2 is increased, and the light spot is more uniform.

[0043] Furthermore, the A-level surfaces 31 are symmetrically arranged along the diameter direction of the mirror body 2, that is, the two opposite sides of the mirror body 2 along the diameter are both the A-level surfaces 31, or the two opposite sides of the mirror body 2 along the diameter are both the B-level surfaces 32.

[0044] Furthermore, the cross section of the base body 1 is square, and the mirror body 2 corresponds to the shape of the base body 1.

[0045] The combination of square lens structures greatly improves the uniformity of the light spots formed between lamps and significantly reduces the manufacturing process, saving production process costs while improving the TV backlight visual effect.

[0046] Furthermore, the cross section of the base body 1 is circular, and the mirror body 2 corresponds to the shape of the base body 1.

[0047] The circular lens structure has strong adaptability and versatility and low cost.

[0048] Furthermore, the cross-section of the base body 1 is elliptical, and correspondingly, the mirror body 2 corresponds to the shape of the base body 1, or the periphery of the cross-section of the base body 1 is a closed free curve, and the mirror body 2 corresponds to the shape of the base body 1.

[0049] Elliptical lens structures or other free shapes are suitable for scenes with special requirements.

[0050] Embodiment 2

[0051] The multi-curve controlled silicone lens in this example includes the lens structure of the first embodiment.

[0052] Embodiment 3

[0053] The direct-lit backlight module in this example includes a multi-curve controlled silicone lens.

[0054] In summary, the uniformity of light output is improved by setting up multi-curve control. The light passes through the light incident surface and the light output surface of the mirror body in turn through the accommodating cavity, and the design is rotated to form curves in multiple directions of the A-level surface and the B-level surface. The intensity of light in multiple directions is accurately controlled to control the brightness of the light. The light output of the lens can easily form a visual effect with good uniformity, thereby improving the uniformity of the TV backlight.

[0055] The above is only the implementation mode of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A lens structure, characterized in that: include: A base body (1) and a mirror body (2), wherein the mirror body (2) is arranged on the base body (1) and has an inwardly concave accommodating cavity (20), wherein the bottom surface of the accommodating cavity (20) is a light incident surface (21), and the outer surface of the mirror body (2) opposite to the light incident surface (21) is a light emitting surface (22), wherein the light incident surface (21) comprises an A-level surface (31) and a B-level surface (32), wherein the A-level surface (31) and the B-level surface (32) are arranged at intervals along a circumferential direction, and the A-level surface (31) and the B-level surface (32) are connected, wherein the curve of the longitudinal section of the light emitting surface (22) corresponds to the curve of the cross section of the light incident surface (21), and the surface shape of the A-level surface (31) complies with the formula: The surface shape of the Class B surface (32) complies with the formula: Among them, c is the curvature of the vertex of the surface, k is the quadratic aspheric coefficient, r is the radial coordinate, z is the axial coordinate, and a1, a2, a3... are the aspheric coefficients.

2. The lens structure according to claim 1, characterized in that: The top surface of the mirror body (2) is provided with a plurality of circles of first annular protrusions (23), which are arranged in sequence from the center of the top of the mirror body (2) to the edge of the top of the mirror body (2), and the angle between the top surface of the first annular protrusion (23) and the plane where the top surface of the base body (1) is located is α, and the angle α (25) gradually increases from the center of the top of the mirror body (2) to the edge of the top of the mirror body (2).

3. The lens structure according to claim 1, characterized in that: The bottom of the mirror body (2) is provided with a plurality of circles of second annular protrusions (24), which are arranged in sequence from the periphery of the accommodating cavity (20) to the edge of the bottom of the mirror body (2), and the angle between the bottom surface of the second annular protrusion (24) and the plane where the top surface of the base (1) is located is β, and the angle β (26) gradually decreases from the center of the bottom of the mirror body (2) to the edge of the bottom of the mirror body (2).

4. The lens structure according to claim 1, characterized in that: The A-level surface (31) is symmetrically arranged along the diameter direction of the mirror body (2).

5. The lens structure according to any one of claims 1 to 4, characterized in that: The base body (1) has a square cross section.

6. The lens structure according to any one of claims 1 to 4, characterized in that: The base body (1) has a circular cross section.

7. The lens structure according to any one of claims 1 to 4, characterized in that: The base body (1) has an elliptical cross section.

8. The lens structure according to any one of claims 1 to 4, characterized in that: The periphery of the cross-section of the seat body (1) is a closed free curve.

9. A multi-curve controlled silicone lens, characterized in that: The lens structure comprises any one of claims 1-8.

10. A direct-type backlight module, characterized in that: A multi-curve controlled silicone lens comprising the multi-curve controlled silicone lens as described in claim 9.

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