TW201541160A - Light guide plate - Google Patents

Abstract

A light guide plate includes at least one light incident surface, at least one light emitting surface and multiple micro structure units. The light emitting surface makes an angle with the light incident surface. The micro structure units are arranged on the light-emitting surface, and each of the micro structure units includes a first micro structure and a second micro structure adjacent to the first micro structure. The first micro structure includes a first inclined plane and a second inclined plane making a first angle with the first inclined plane, the second micro structure includes a third inclined plane and a fourth inclined plane making a second angle with the third inclined plane, and the second angle is different to the first angle. A length of the first micro structure measured in a direction perpendicular to the light incident surface is the same as that of the second micro structure, and a length of the first micro structure measured in a direction parallel with the light incident surface and the light-emitting surface is the same as that of the second micro structure.

Description

Light guide

The present invention relates to a light guide plate.

Conventional light guide plates generally use a plurality of light-emitting diodes as light sources, but the light provided by the light-emitting diodes has a certain divergence angle. When the pitch of the light-emitting diodes is large, the light-guide plates are likely to form dark regions. And reduce the uniformity of light output.

In order to avoid this problem, Taiwan Patent Publication No. TW200942916 discloses a design of an optical plate. As shown in FIG. 6 , the optical plate 100 has a light incident surface 102 and a light exit surface 104 , wherein a plurality of first trenches 110 and a plurality of second trenches 112 are alternately formed on the light incident surface 102 . The first trench 110 is different in shape from the second trench 112. For example, the first trench 110 may be triangular and the second trench 112 may be curved. The dark regions of the light exiting surface 104 are eliminated by the grooves 110, 112 having different shapes to change the direction in which light is incident on the optical plate 100.

Taiwan Patent Publication No. TWM351401 discloses a light guide plate having a plurality of V-shaped grooves on one side of the light guide plate, and the density, angle and depth of the V-shaped grooves are randomly distributed on one surface of the light guide plate according to different degrees. Chinese Patent Publication No. CN1996059A discloses a backlight module. The backlight module includes a light-emitting diode and a light guide plate, and two rows of V-shaped grooves of different structures are arranged on the light-incident surface of the light guide plate. Chinese Patent Publication No. CN102563466A discloses a light guide plate having a plurality of first microstructures and a plurality of second microstructures on the light entrance side of the light guide plate, wherein the first microstructure and the second microstructure are alternately arranged, and the V in the first microstructure The apex angle of the slot is greater than the apex angle of the V-groove in the second microstructure.

The invention provides a light guide plate which has good light uniformity, is easy to manufacture and is easy to control the light exit angle.

According to an embodiment of the invention, a light guide plate for receiving and guiding light from at least one light source includes at least one light incident surface, at least one light exit surface, and a plurality of microstructure units. The light incident surface is adjacent to the light source to receive the light emitted by the light source, and the light emitting surface is at an angle to the light incident surface. A plurality of microstructure units are arranged on the light incident surface, and each of the microstructure units includes an adjacent first microstructure and a second microstructure. The first microstructure includes a first slope and a second slope sandwiching a first angle, and the second microstructure includes a third slope and a fourth slope sandwiching a second angle, wherein the first angle and the second angle Different. The first microstructure and the second microstructure have the same length in a direction perpendicular to the light incident surface, and the first microstructure and the second microstructure have the same length in a direction parallel to the light incident surface and the light exit surface.

In an embodiment, the angles of the first angle and the second angle range from 90 degrees to 130 degrees, respectively.

In an embodiment, each of the microstructure units may be a triangular bump structure or a recess structure that is recessed toward the inside of the light guide plate.

In an embodiment, the light source can include at least one light emitting diode light strip.

In one embodiment, the light emitting diode light bar includes a plurality of light emitting diodes, and each of the microstructured units is in contact with a light emitting diode.

A light guide plate according to another embodiment of the present invention includes at least one light incident surface, at least one light exit surface, and a plurality of microstructure units. The light incident surface is adjacent to the light source to receive the light emitted by the light source, and the light emitting surface is at an angle to the light incident surface. A plurality of microstructure units are arranged on the light incident surface, and each of the microstructure units includes an adjacent first microstructure and a second microstructure. The first microstructure includes a first slope adjacent to the second microstructure and a second slope away from the second microstructure, the second microstructure includes a third slope adjacent to the second microstructure and a second away from the second microstructure The fourth slope. The first inclined surface and the light incident surface are sandwiched by a third angle, and the third inclined surface and the light incident surface are sandwiched by a fourth angle, wherein the third angle is different from the fourth angle. The first microstructure and the second microstructure have the same length in a direction perpendicular to the light incident surface, and the first microstructure and the second microstructure have the same length in a direction parallel to the light incident surface and the light exit surface.

In an embodiment, the angle between the first inclined surface and the light incident surface may be different from the angle between the second inclined surface and the light incident surface, and the angle between the third inclined surface and the light incident surface may be different from the fourth oblique angle. The angle between the face and the entrance face.

According to the design of each of the above embodiments, the optical deflection angles of the first microstructure and the second microstructure are different, so that the intermediate line of the two structures is asymmetric, so that the light is incident on the light guide plate from the first microstructure. The traveling direction is different from the traveling direction of the light after the second microstructure is incident on the light guide plate, so that more light enters the region where the light guide plate may be a dark region, and the dark region of the light surface is eliminated to improve the light exiting surface. The uniformity of the exiting surface source. Furthermore, according to the design of the embodiment, since the length and height of the first microstructure and the second microstructure are opposite to each other, the process of the light guide plate is relatively simple, and only a different number is required. An angle and a second angle can produce an asymmetric type of microstructure unit, and at the same time, it is easy to accurately adjust the light angle and the light deflection effect of concentrated or diffused light.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein. The above and other objects, features, and advantages of the invention will be apparent from

10‧‧‧Light guide plate

12‧‧‧Into the glossy surface

14‧‧‧Glossy

20‧‧‧Microstructural unit

22, 24‧‧‧Microstructure

22a‧‧‧First bevel

22b‧‧‧second slope

24a‧‧‧3rd bevel

24b‧‧‧4th bevel

30, 30' ‧ ‧ light source

31‧‧‧Lighting diode

100‧‧‧Optical board

102‧‧‧Into the glossy surface

104‧‧‧Glossy surface

110, 112‧‧‧ trench

A1-a4, b1, b2‧‧‧ angle

H, W‧‧‧ length

L‧‧‧ middle line

1 is a schematic view of a light guide plate according to an embodiment of the present invention.

2 is an enlarged schematic view of a microstructure unit according to an embodiment of the present invention.

3 is a schematic view of a light guide plate according to another embodiment of the present invention.

4 is a schematic view showing another embodiment of the light source of FIG. 1.

Figure 5 is a schematic illustration of another embodiment of the light source of Figure 2.

Figure 6 is a schematic view of a conventional light guide plate.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the embodiments of the invention. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

1 is a schematic view showing a light guide plate according to an embodiment of the present invention. As shown As shown in FIG. 1, the light guide plate 10 for receiving light from a light source 30 and guiding it out comprises at least one light incident surface 12, at least one light exit surface 14, and a plurality of microstructure units 20. The light-incident surface 12 is adjacent to the light source 30 to receive the light emitted by the light source 30. The light-emitting surface 14 is at an angle with the light-incident surface 12, and the light that travels inside the light-guide plate 10 is led out through the light-emitting surface 14. A plurality of microstructure units 20 are arranged on the light incident surface 12, and each of the microstructure units 20 includes an adjacent first microstructure 22 and a second microstructure 24, and thus the first microstructure 22 and the second microstructure The 24 series are alternately arranged on the light incident surface 12.

2 is an enlarged schematic view of a microstructure unit according to an embodiment of the present invention. As shown in FIG. 2, each microstructure unit 20 includes an adjacent first microstructure 22 and a second microstructure 24, and a first microstructure. 22 includes a first inclined surface 22a and a second inclined surface 22b sandwiching a first angle a1. The second microstructure 24 includes a third inclined surface 24a and a fourth inclined surface 24b sandwiching a second angle a2. In this embodiment, the first angle a1 is different from the second angle a2, and the lengths H of the first microstructure 22 and the second microstructure 24 in the direction perpendicular to the light incident surface 12 are the same, and the first microstructure 22 The length W of the second microstructures 24 in the direction parallel to the light incident surface 12 and the light exit surface 14 is the same.

With the design of the above embodiment, since the first angle a1 of the first microstructure 22 is different from the second angle a2 of the second microstructure 24, the first microstructure 22 and the second microstructure 24 can be opposite to each other. The intermediate line L is in an asymmetric state, so that the traveling direction of the light after entering the light guide plate 10 from the first microstructure 22 is different from the traveling direction of the light after entering the light guide plate 10 from the second microstructure 24, so that there will be more light. When entering the region where the light guide plate 10 may be a dark region, the dark region phenomenon of the light-emitting surface 14 is effectively eliminated, and the uniformity of the surface light source emitted from the light-emitting surface 14 is improved. Moreover, according to the design of the embodiment, since the length and height of the first microstructure 22 and the second microstructure 24 are opposite to each other, the process of the light guide plate 10 is relatively simple and only needs to be performed. Setting the different first angle a1 and second angle a2 can generate the asymmetric microstructure unit 20, and at the same time, it is easy to accurately adjust the light angle and the light deflection effect of the concentrated or diffused light.

In an embodiment, the angle ranges of the first angle a1 and the second angle a2 may be 90 degrees to 130 degrees, respectively. The manner of forming the microstructures 22, 24 is not limited, and may be, for example, a triangular bump structure (FIG. 1) or a recessed structure recessed toward the inside of the light guide plate 10. 3). Furthermore, the light source 30 can comprise, for example, at least one light-emitting diode light strip.

4 is a schematic view showing another embodiment of the light source of FIG. 1. Referring to FIG. 1 and FIG. 3 simultaneously, the light source 30' is similar in structure to the light source 30 except that the light source 30a includes a plurality of light emitting diodes 31, and each of the microstructure units 20 corresponds to a light emitting diode.

Figure 5 is a schematic illustration of another embodiment of the light source of Figure 2. Referring to FIG. 2 and FIG. 5 simultaneously, the light source 30' is similar in structure to the light source 30 except that the light source 30a includes a plurality of light emitting diodes 31, and each of the microstructure units 20 corresponds to a light emitting diode.

It should be noted that the manner in which the asymmetric structure of the microstructure unit is generated in the present invention is not limited. Referring again to FIG. 2, in another embodiment, the first microstructure 22 includes a first slope 22a adjacent to the second microstructure 24 and Along from the second bevel 22b of the second microstructure 24, the second microstructure 24 includes a third bevel 24a adjacent the first microstructure 22 and a fourth bevel 24b remote from the first microstructure 22. The inclined surface 22a and the light incident surface 12 are sandwiched by a third angle a3, and the inclined surface 24a and the light incident surface 12 are sandwiched by a fourth angle a4, wherein the third angle a3 and the fourth angle a4 are different, and an asymmetric pattern can also be generated. Microstructure unit. Furthermore, in an embodiment, the angle a3 between the inclined surface 22a and the light incident surface 12 may be different from the angle b1 between the inclined surface 22b and the light incident surface 12, and the angle a4 between the inclined surface 24a and the light incident surface 12 may be different from the inclined surface. An angle b2 between the 24b and the light incident surface 12.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention.

10‧‧‧Light guide plate

12‧‧‧Into the glossy surface

14‧‧‧Glossy

20‧‧‧Microstructural unit

22, 24‧‧‧Microstructure

22a‧‧‧First bevel

22b‧‧‧second slope

24a‧‧‧3rd bevel

24b‧‧‧4th bevel

A1-a4, b1, b2‧‧‧ angle

H, W‧‧‧ length

L‧‧‧ middle line

Claims (13)

a light guide plate for receiving and guiding light from at least one light source, the light guide plate comprising: at least one light incident surface adjacent to the light source to receive light emitted by the light source; at least one light emitting surface, and the light entering An angle of the face clip; and a plurality of microstructure units arranged on the light incident surface, each of the microstructure units including an adjacent first microstructure and a second microstructure, the first microstructure comprising a clip a first inclined surface and a second inclined surface of the first angle, the second microstructure includes a third inclined surface and a fourth inclined surface sandwiching a second angle, wherein the first angle is different from the second angle, The first microstructure and the second microstructure have the same length in a direction perpendicular to the light incident surface, and the first microstructure and the second microstructure are in a direction parallel to the light incident surface and the light exit surface. The length is the same. The light guide plate of claim 1, wherein the angle of the first angle and the second angle are 90 degrees and 130 degrees, respectively. The light guide plate of claim 1, wherein the microstructure units are triangular bump structures. The light guide plate of claim 1, wherein the microstructure units are recessed structures that are recessed toward the inside of the light guide plate. The light guide plate of claim 1, wherein the light source comprises at least one light emitting diode light strip. The light guide plate of claim 5, wherein the light emitting diode light bar comprises a plurality of light emitting diodes, and each of the microstructure units corresponds to one of the light emitting diodes. A light guide plate for receiving and guiding light from at least one light source, the light guide plate comprising: Having at least one light incident surface adjacent to the light source to receive light emitted by the light source; at least one light emitting surface is at an angle with the light incident surface; and a plurality of microstructure units are arranged on the light incident surface, each of the micro The structural unit includes an adjacent first microstructure and a second microstructure, the first microstructure including a first slope adjacent to the second microstructure and a second slope away from the second microstructure, the first The second microstructure includes a third inclined surface adjacent to the first microstructure and a fourth inclined surface away from the first microstructure, the first inclined surface and the light incident surface sandwiching a third angle, the third inclined surface and the input The smoothing clip has a fourth angle, wherein the third angle is different from the fourth angle, and the first microstructure and the second microstructure have the same length in a direction perpendicular to the light incident surface, and the first The microstructure and the second microstructure have the same length in a direction parallel to the light incident surface and the light exit surface. The light guide plate of claim 7, wherein an angle between the first inclined surface and the light incident surface is different from an angle between the second inclined surface and the light incident surface. The light guide plate of claim 7, wherein an angle between the third inclined surface and the light incident surface is different from an angle between the fourth inclined surface and the light incident surface. The light guide plate of claim 7, wherein the microstructure units are triangular bump structures. The light guide plate of claim 7, wherein the microstructure units are recessed structures that are recessed toward the inside of the light guide plate. The light guide plate of claim 7, wherein the light source comprises at least one light emitting diode light strip. The light guide plate of claim 12, wherein the light emitting diode light bar comprises a plurality of light emitting diodes, and each of the microstructure units corresponds to one of the light emitting diodes.