CN201437963U - Improved structure of light guide plate - Google Patents

Abstract

The utility model discloses a light guide plate structure improvement, the light guide plate at least comprises a light incident surface, a bottom surface intersected with the light incident surface and a light emergent surface opposite to the bottom surface, and a plurality of point light sources are arranged at one side corresponding to the light incident surface; the light incident surface forms at least one inclined part, an included angle is formed between the inclined part and the bottom surface, the included angle is smaller than 90 degrees, light rays of the point light source are not easy to run off after entering the light guide plate through the light incident surface, the point light source can be effectively applied to the light guide plate, and therefore the efficiency of the whole backlight module is improved.

Description

Light guide plate structure improvement

technical field

The utility model aims at improving the structure of the light guide plate in the backlight module, and aims to provide an improved structure of the light guide plate that is not easy to lose when the light enters the light guide plate from the light incident surface, can be effectively used in the light guide plate, and further improves the efficiency of the overall backlight module.

Background technique

According to the general application of liquid crystal displays in information devices, you can choose to use the direct type or side-light backlight module structure according to the actual design requirements; as shown in Figure 1 and Figure 2A, it is a general side-light backlight module The structure is mainly composed of a point light source 11, a light guide plate 12, a diffuser plate 13 and a prism assembly 14. The light guide plate 12 includes a light incident surface 121, a bottom surface 122 intersecting the light incident surface 121, and a bottom surface connected to the light incident surface 121. 122 opposite to the light emitting surface 123, the point light source 11 is arranged on the side corresponding to the light incident surface 121, and receives the light emitted by the point light source 11, and its bottom surface 122 reflects and scatters the introduced light to form a uniform light source along all directions. For the dispersed scattered light, the light exit surface 123 guides the uniformly dispersed light out of the light guide plate 12 and guides it to the liquid crystal display panel, so as to achieve the display effect of the liquid crystal display panel.

Wherein, the light guide plate 12 is flat plate as shown in the figure, and the light of each point light source 11 enters the light guide plate 12 from the light incident surface 121, and the light is emitted from the expected direction by the light guide plate 12; however, the point light source When part of the parallel light L1 of 11 enters the light guide plate 12 from the light incident surface 121, the light L1 will directly exit from the side of the light guide plate 12, and cannot be emitted toward the light exit surface 123, greatly reducing the energy of the light, thereby reducing the backlight module. efficiency.

In addition, the light guide plate 12 can also be a wedge-shaped plate as shown in FIG. The height H1 of 124 is greater than the diameter of the point light source 11, and the light of each point light source 11 enters through the protrusion 124, so that all the light of the point light source 11 can enter the light guide plate 12 through the protrusion 124, and the light guide plate 12 will The light is emitted from the expected direction, so that the light incident area of the light guide plate is increased.

However, the protruding portion 124 forms a slope 125 inclined at a certain angle toward the light-emitting surface 123 of the light guide plate, so when part of the light L1 of the point light source 11 enters the light guide plate 12 from the light-incidence surface 121, the light L2 is refracted through the slope 125. The light enters toward the bottom surface 122, and after being refracted by the bottom surface 122, the light L3 exits toward the light-emitting surface 123. The light L3 is emitted toward the light-emitting surface 123 after the above-mentioned multiple refractions, greatly reducing the energy of the light, thereby reducing the backlight module efficiency.

Utility model content

In view of this, the technical problem solved by the utility model is to provide an improved structure of the light guide plate. When the light enters the light guide plate from the light incident surface, it is not easy to be lost. It can be effectively applied in the light guide plate and used in the backlight module. It can also improve the efficiency of the overall backlight module.

The technical solution of the utility model is: an improved structure of a light guide plate, the light guide plate at least includes a light incident surface, a bottom surface intersecting the light incident surface, and a light exit surface opposite to the bottom surface, and a plurality of point light sources are provided On the side corresponding to the light incident surface; the light incident surface forms at least one inclined portion, and the inclined portion forms an included angle with the bottom surface, and the included angle is less than 90 degrees.

Wherein, the light incident surface forms an inclined portion and a flat portion, and the flat portion is perpendicular to the bottom surface.

A plurality of optical microstructures are arranged on the inclined portion and/or on the planar portion.

The optical microstructure is a groove recessed into the surface.

The optical microstructure is a groove protruding from the surface.

The light incident surface forms a single inclined portion.

Complex optical microstructures are arranged on the inclined portion.

The light incident surface is formed with a plurality of inclined parts, and a connecting part is provided between each inclined part, and the connecting part is parallel to the bottom surface.

The light guide plate is flat or wedge-shaped.

The beneficial effects of the utility model are: the light guide plate at least includes a light incident surface, a bottom surface intersecting the light incident surface, and a light exit surface opposite to the bottom surface, and a plurality of point light sources are arranged on a corresponding light incident surface. side; wherein, the light incident surface forms at least one inclined portion, and the inclined portion forms an included angle with the bottom surface, the included angle is less than 90 degrees, so that the light from the point light source is not easy to be lost after entering the light guide plate from the light incident surface, and can be used in The effective application in the light guide plate improves the efficiency of the overall backlight module.

Description of drawings

FIG. 1 is a structural perspective view of a conventional light guide plate;

2A and B are structural schematic diagrams of conventional light guide plates;

3 is a perspective view of the structure of the light guide plate in the first embodiment of the present invention;

FIG. 4A is a schematic structural diagram of a light guide plate in the first embodiment of the present invention;

FIG. 4B is a schematic structural view of the light guide plate of the second embodiment of the present invention;

5 is a perspective view of the structure of the light guide plate of the third embodiment of the present invention;

6 is a schematic structural view of a light guide plate in a fourth embodiment of the present invention;

7 is a perspective view of the structure of the light guide plate in the fifth embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a light guide plate according to a sixth embodiment of the present invention.

【Description of figure number】

Point light source 11 Light guide plate 12

Light incident surface 121 Bottom surface 122

Light-emitting surface 123 Protruding part 124

Bevel 125 Diffusion plate 13

Prism combination 14 Light guide plate 20

Light incident surface 21 Inclined part 211

Plane part 212 Connecting part 213

Bottom surface 22 Light-emitting surface 23

Protrusion 24 Bevel 25

V-shaped vertical groove 26 Arc vertical groove 27

Point Light 3

Detailed ways

The structure of the light guide plate of the utility model is improved. The structure of the light guide plate 20 is shown in the first embodiment shown in FIG. 3 and FIG. 21 intersecting the bottom surface 22, and a light-emitting surface 23 opposite to the bottom surface 22, and the plurality of point light sources 3 are arranged on the side corresponding to the light-incident surface 21, and the light guide plate 20 forms a protruding portion 24 at the light-incidence surface 21 Make the height H1 of the protruding portion 24 higher than the height H2 of the light guide plate 20, and the height H1 of the protruding portion 24 is greater than the diameter of the point light source 3, and the protruding portion 24 is inclined at a certain angle toward the light-emitting surface 23 of the light guide plate Bevel 25.

The key point is that the light incident surface 21 forms at least one inclined portion 211. In the embodiment shown in the figure, the light incident surface 21 forms a single inclined portion 211, and the inclined portion 211 forms an angle A with the bottom surface 22, The included angle A is less than 90 degrees, so when part of the light L1 of the point light source 3 enters the light guide plate 20 from the light incident surface 21, the light L2 is directly incident on the bottom surface 22 by the inclined portion 211, and after being refracted by the bottom surface 22, The light L3 is emitted toward the light-emitting surface 23. The inclined portion 211 can reduce the light entering the inclined surface 25, so that the energy of the light will not be broken due to multiple refractions, so that the light is not easy to be lost after entering the light guide plate from the light-incoming surface. Effective application in the light guide plate, when used in the backlight module, can also improve the overall efficiency of the backlight module.

As shown in Figure 4B is the second embodiment of the present utility model, the light guide plate 20 is a flat plate, and it is also provided with a light incident surface 21, a bottom surface 22, and a light exit surface 23, and the light incident surface 21 also forms a single inclined portion 211, when part of the light L1 of the point light source 3 enters the light guide plate 20 from the light incident surface 21, the light L2 is directly incident on the bottom surface 22 through the inclined part 211, and after being refracted by the bottom surface 22, the light L3 is directed to the light exit surface 23 The inclined part 211 can reduce the light emitted from the side of the light guide plate, so that the light is not easy to be lost after entering the light guide plate from the light incident surface, and can also improve the efficiency of the overall backlight module.

As shown in Figure 5, it is the third embodiment of the present utility model, the incident surface 21 is formed with an inclined portion 211 and a flat portion 212, and the flat portion 212 is perpendicular to the bottom surface 22, which can also achieve the effect of reducing light loss; of course , the light guide plate can be flat or wedge-shaped as shown in the figure.

As shown in Figure 6, it is the fourth embodiment of the present utility model, the light incident surface 21 is formed with a plurality of inclined parts 211, and a connecting part 213 is arranged between each inclined part 211, and the connecting part 213 is parallel to the bottom surface 22, and can also be To achieve the effect of reducing light loss; of course, the light guide plate can be flat or wedge-shaped as shown in the figure.

The inclined portion and/or planar portion in the above-mentioned embodiments may further be provided with a plurality of optical microstructures, which may be concave or protruding grooves on the surface, and the grooves may be V-shaped or arc-shaped, and Each optical microstructure can be a horizontal groove and/or a vertical groove, as shown in the fifth embodiment of FIG. 26.

As shown in the sixth embodiment of FIG. 8, taking a flat light guide plate as an example, the light incident surface 21 is formed with an inclined portion 211 and a flat portion 212, and the inclined portion 211 is provided with a plurality of arc-shaped vertical grooves on the concave surface. Groove 27; of course, the planar portion can also be provided with optical microstructures.

Claims (10)

1. An improved light guide plate structure, the light guide plate at least includes a light incident surface, a bottom surface intersecting the light incident surface, and a light exit surface opposite to the bottom surface, and a plurality of point light sources are arranged on the light incident surface side; characterized in that: The light incident surface forms at least one inclined portion, and the inclined portion forms an included angle with the bottom surface, and the included angle is less than 90 degrees. 2 . The structural improvement of the light guide plate according to claim 1 , wherein the light incident surface is formed with an inclined portion and a flat portion, and the flat portion is perpendicular to the bottom surface. 3 . 3 . The structural improvement of the light guide plate according to claim 2 , wherein a plurality of optical microstructures are provided on the inclined portion and/or on the planar portion. 4 . 4 . The structural improvement of the light guide plate according to claim 3 , wherein the optical microstructure is a groove recessed into the surface. 5. The structural improvement of the light guide plate according to claim 3, wherein the optical microstructure is a groove protruding from the surface. 6 . The structural improvement of the light guide plate according to claim 1 , wherein the light incident surface forms a single inclined portion. 7 . The structural improvement of the light guide plate according to claim 6 , wherein a plurality of optical microstructures are provided on the inclined portion. 8 . The structural improvement of the light guide plate according to claim 7 , wherein the optical microstructure is a groove concave or convex on the surface. 9 . The structural improvement of the light guide plate according to claim 1 , wherein a plurality of inclined portions are formed on the light incident surface, and connecting portions are provided between each inclined portion, and the connecting portions are parallel to the bottom surface. 10. The structural improvement of the light guide plate according to claim 1, 2, 6 or 9, wherein the light guide plate is flat or wedge-shaped.

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