TWI489157B - Twins light guiding plate and manufacturing method thereof and backlight module with twins light guiding plate - Google Patents

Description

Double-layer light guide plate structure, manufacturing method thereof and backlight module with double-layer light guide plate

The invention relates to a light guide plate structure and a manufacturing method thereof, in particular to a double-layer light guide plate structure and a manufacturing method thereof, and a backlight module with a double-layer light guide plate.

In recent years, flat panel displays such as LCD (Liquid Crystal Display) and PDP (Plasma Display Panel) have become lighter and thinner, and have gradually replaced CRT (Cathode Ray Tube) displays as displays. The mainstream of the market is widely used in TV, notebook computers, mobile phones and other products.

Most electronic devices generally have a single-sided display, which has only one display surface, but as its application range expands, in some applications, a dual display screen display device may be required, such as in a public area or in a play. In the field, the two-sided display allows people in different locations to view the information displayed on the display device.

Please refer to FIG. 1 , which is a schematic diagram of a conventional double-sided display structure. The conventional double-sided display A1 uses only one light guide plate A11, and the optical film A12 and the upper panel A13 are disposed on one side of the light guide plate A11, and the optical film A14 and the lower panel A15 are disposed on the other side, and then fixed. On the outer frame A16. In the double-sided display A1, the upper and lower surfaces of the light guide plate A11 are both light-emitting surfaces, and are provided with a microstructure (not shown). Therefore, the optical taste of the upper panel A13 and the lower panel A15 cannot be adjusted, resulting in optical The difficulty of adjusting the taste is quite high.

Please refer to FIG. 2, which is a schematic diagram of another conventional double-sided display structure. Another conventional double-sided display A2 is provided with two light guide plates A21, one of which is provided with an optical film A22 and an upper panel A23 on one side thereof, and the other side faces the other light guide plate A21, and another A light guide plate A21 is provided on one side thereof with an optical film A24 and a lower plate A25, and the two light guide plates A21 are respectively fixed to the outer frame A26 by being locked or engaged. In such a double-sided display A2, although the optical taste can be individually adjusted by providing two light guide plates A21, the two light guide plates A21 are separately fixed to the outer frame A26, and the two light guide plates A21 The distance between them is quite close, which makes the assembly quite complicated. In addition, when the double-sided display A2 is vibrated, it is easy to cause the two light guide plates A21 to collide with each other and scratch.

In view of this, the present invention provides an embodiment of a dual-layer light guide plate structure, including: a first light guide plate, a plurality of first support columns, and a second light guide plate. The first light guide plate includes a first light-emitting surface and a first non-light-emitting surface; the plurality of first support columns are located on the first non-light-emitting surface; and the second light guide plate includes a second light-emitting surface and a second non-light-emitting surface. The second non-light-emitting surface faces the first non-light-emitting surface, and each of the first support columns abuts against the second light guide plate, and each of the first support columns and the second light guide plate are integrally joined by ultrasonic welding to maintain a gap between the first light guide plate and the second light guide plate.

The invention further provides an embodiment of a method for manufacturing a double-layer light guide plate structure, comprising: emitting a first light guide plate and a plurality of first support columns, wherein the plurality of first support columns are disposed on the first light guide plate; and the second light guide or hot press a light guide plate; a first light guide plate and a second light guide plate are stacked, such that each first support column abuts against the second light guide plate; ultrasonic welding is first The light guide plate and the second light guide plate are integrated into each of the first support columns and the second light guide plate.

The invention further provides an embodiment of a backlight module having a double-layer light guide plate, comprising: a double-layer light guide plate structure, a frame, and a light source module. The frame houses a double-layer light guide plate structure; the light source module projects light toward the double-layer light guide plate structure to emit light from the first light-emitting surface and the second light-emitting surface.

According to the light guide plate structure and the manufacturing method thereof of the present invention, the double-layer light guide plates can be integrated to avoid collision with each other, and the overall strength is increased by the integrated structure. In addition, the first light guide plate and the second light guide plate can respectively adjust the optical quality, and it is easier to achieve the optical taste requirement.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art.

3A and 3B show a first embodiment of the double-layer light guide plate structure of the present invention. Fig. 3A is a schematic view of the double-layer light guide plate before ultrasonic welding, and Fig. 3B is a schematic view of the double-layer light guide plate after ultrasonic welding.

As shown in FIG. 3A, in the first example of the present invention, the double-layer light guide plate structure 1 comprises: a first light guide plate 2, a plurality of first support columns 3, a second light guide plate 5, and a plurality of second support columns 6.

The first light guide plate 2 is a substantially rectangular sheet structure having a first light output Face 21 and first non-light exit face 22. The first support column 3 is integrally formed on the first non-light-emitting surface 22 of the first light guide plate 2, and the first support column 3 has a first top surface 31, and the first support column 3 is connected to the first non-light-emitting surface. The cross-sectional area of the surface 22 is greater than or equal to the cross-sectional area of the first top surface 31. As a whole, the first support post 3 is linearly tapered from the first non-light-emitting surface 22 to the first top surface 31 (eg, As shown in Fig. 3A, the cross section is a trapezoidal shape). However, the first support column 3 is linearly tapered. The invention is not limited thereto. For example, the first support column 3 or the stepped tapered structure or other joints have a large cross section and a small top cross section. structure.

The second light guide plate 5 has a substantially rectangular sheet structure and has a second light exit surface 51 and a second non-light exit surface 52. The second support column 6 is integrally formed on the second non-light-emitting surface 52 of the second light guide plate 5, and the second support column 6 has a second top surface 61, and the second support column 6 is connected to the second non-light-emitting surface. The cross-sectional area of the surface 52 is greater than or equal to the cross-sectional area of the second top surface 61. As a whole, the second support post 6 is linearly tapered from the second non-light-emitting surface 52 to the second top surface 61 (eg, As shown in Fig. 3A, the cross section is a trapezoidal shape). However, the second support column 6 is linearly tapered. The invention is not limited thereto. For example, the second support column 6 or the stepped tapered structure or other joints have a large cross section and a small top cross section. structure.

After the first light guide plate 2 and the second light guide plate 5 are stacked, the first non-light-emitting surface 22 of the first light guide plate 2 faces the second non-light-emitting surface 52 of the second light guide plate 5, so that each of the first support columns 3 The first top surface 31 abuts against the second top surface 61 of each of the second support columns 6 .

As shown in FIG. 3B, when the first light guide plate 2 and the second light guide plate 5 are stacked, On the ultrasonic welding machine, the first light guide plate 2 and the second light guide plate 5 are fused by ultrasonic waves, so that the first top surface 31 of the first support column 3 and the second top surface 61 of the corresponding second support column 6 are severely The first top surface 31 and the second top surface 61 are melted and joined together to maintain a gap between the first light guide plate 2 and the second light guide plate 5 by friction. In this embodiment, after the first support post 3 and the second support post 6 are integrally fused by ultrasonic waves, the original tapered structure is changed to have the same cross-sectional size (as shown in FIG. 3B, the cross section is rectangular). The columnar structure, but the invention is not limited thereto, and the shape after welding is changed depending on the original tapered structure.

It should be noted that the number and position of the first support column 3 and the corresponding second support column 6 are configured according to the weight of the first light guide plate 2 and the second light guide plate 5 and the amount of deformation thereof to ensure the first guide. The light plate 2 and the second light guide plate 5 do not collide. As shown in FIG. 3C, the number of the first support columns 3 and the corresponding second support columns 6 is insufficient, causing the deformation of the first light guide plate 2 due to its own weight to cause the first light guide plate 2 and the second light guide plate 5 to occur. collision. As shown in FIG. 3D, the number and position of the first support post 3 and the corresponding second support post 6 are appropriate. Although the first light guide plate 2 is deformed by its own weight, it does not collide with the second light guide plate 5. Generally, the first support post 3 and the corresponding second support post 6 are evenly disposed on the first light guide plate 2 and the second light guide plate 5.

As shown in FIG. 4A, in some embodiments, the first light guide plate 2 may be provided with a plurality of first patterns 25 on the first non-light-emitting surface 22, and the second light guide plate 5 may be disposed on the second non-light-emitting layer. The face 52 is provided with a plurality of second patterns 55. In some embodiments, the first support post 3 is disposed closer to the first plurality of first patterns 25 than the first pattern 25 The periphery of the non-light-emitting surface 22, the second support column 6 is disposed at a position closer to the periphery of the second non-light-emitting surface 52 than the plurality of second patterns 55, in other words, the first support column 3 is disposed at the outer edge of the plurality of first patterns 25, The two support columns 6 are disposed on the outer edge of the plurality of second patterns 55. The height of the first support post 3 is substantially greater than the height of the first pattern 25, and the height of the second support post 6 is substantially greater than the height of the second pattern 55.

As shown in FIGS. 4B and 4C, in some embodiments, a portion of the first support pillars 3 are disposed on the outer edge of the plurality of first patterns 25, and another portion of the first support pillars 3 may be disposed on the plurality of first patterns. Between 25, a part of the second support columns 6 are disposed on the outer edge of the plurality of second patterns 55, and the other portion of the second support columns 6 may be disposed between the plurality of second patterns 55. In some embodiments, the first support post 3 between the plurality of first patterns 25 is provided with a first pattern 25 on its first top surface 31, and the second support post 6 between the plurality of second patterns 55 is in its The second top surface 61 is provided with a second pattern 55. In other words, the first support pillars 3 and the second support pillars 6 located between the patterns can be regarded as a part of the pattern structure.

As shown in FIG. 4D, in some embodiments, the first support pillar 3 and the first pattern 25 have the same pattern structure, and the second support pillar 6 and the second pattern 55 have the same pattern structure, and the pattern structures have At a constant height, the pattern structure of the first light guide plate 2 and the pattern structure of the second light guide plate 5 are integrally joined by ultrasonic welding to form a plurality of support columns.

The foregoing description is directed to the position of the support column and the pattern. The present invention is not limited thereto. The present invention can only provide the plurality of first patterns 25 on the first light guide plate 2 without providing the support column 3, or only a plurality of second patterns 55 are disposed on the two light guide plates 5 The support post 6 is not provided, or the first light guide plate 2 and/or the second light guide plate 5 may further have a pattern structure on the light exit surface thereof.

As shown in FIG. 4E, in some embodiments, the first light guide plate 2 forms a plurality of first support columns 3 in an integrally formed manner on the first non-light-emitting surface 22, and is provided with a plurality of first on the first non-light-emitting surface 22 Pattern 25. After the first light guide plate 2 and the second light guide plate 5 are stacked, they are placed on the ultrasonic welding machine, and the first light guide plate 2 and the second light guide plate 5 are ultrasonically welded to make the first top of the first support column 3 The surface 31 and the second non-light-emitting surface 52 of the second light guide plate 5 are strongly rubbed to generate a local high temperature, and the first top surface 31 and the second non-light-emitting surface 52 are melted and joined together. As shown in FIG. 4F, in some embodiments, the first support post 3 has the same pattern structure as the first pattern 25, and the pattern structure of the first light guide plate 2 is joined to the second light guide plate 5 via ultrasonic welding. One.

5A, 5B and 5C show a second embodiment of the double-layer light guide structure of the present invention. The difference between this embodiment and the first embodiment is that the present embodiment has the reflecting member 7.

As shown in FIG. 5A, the reflector 7 can be pre-positioned on the second light guide plate 5. When the first light guide plate 2 and the second light guide plate 5 are integrally welded by ultrasonic waves, the reflector 7 is located on the first light guide plate 2. Between the first non-light-emitting surface 22 and the second non-light-emitting surface 52 of the second light guide plate 5, and as shown in FIGS. 5A and 5B, the reflection member 7 on the second light guide plate 5 is not covered with the outer edge The second support column 6 does not affect the fusion between the plurality of first support columns 3 and the plurality of second support columns 6. The surface 71 and the surface 72 of the reflecting member 7 may be in contact with or adjacent to the first pattern 25 and the second pattern 55, respectively. Here, the reflector 7 can reserve the support post hole position or the shape design gap first, Avoid interference with the first support column 3 or the second support column 6.

As shown in FIG. 5C, in some embodiments, the first support post 3 is a pattern structure, and the second support post 6 is a pattern structure. The reflective member 7 is first placed on the first light guide plate 2 and the second light guide plate 5. The pattern structure of the first light guide plate 2 and the pattern structure of the second light guide plate 5 are joined together by ultrasonic welding. During the welding process, the gap between the first light guide plate 2 and the second light guide plate 5 is controlled, so that the first non-light-emitting surface 22 of the first light guide plate 2 is attached to the surface 71 of the reflector 7, and the second light guide plate 5 The second non-light-emitting surface 52 is attached to the surface 72 of the reflector 7.

The foregoing description of the reflector 7 is merely an example, and the invention is not limited thereto, and a person skilled in the art can replace the reflective layer formed by coating a material having a reflective property on a light guide plate.

As shown in Fig. 5D, it is a schematic diagram of the ray travel of the present invention. The first support post 3 and the second support post 6 maintain a gap D between the first light guide plate 2 and the second light guide plate 5 to prevent the first light guide plate 2 and the second light guide plate 5 from colliding during the vibration test or transportation process. . The first pattern 25 and the second pattern 55 are to change the traveling direction and path of the light to achieve the specification of optical uniformity, for example, when the light does not touch the first pattern 25 (or the second pattern 55), the traveling direction is light. The path of refraction (light reflection), as indicated by the direction of travel B; for example, when the light hits the first pattern 25 (or the second pattern 55), its direction of travel changes, as indicated by the direction of travel A.

As shown in FIG. 6A, when the first support post 3 is disposed on the outer edge of the two ends of the first light guide plate 2 and the second support post 6 is disposed on the outer edge of the two ends of the second light guide plate 5, the double-layer light guide plate structure The brightness distribution of 1 is as shown in Fig. 6B, wherein the X-axis direction indicates the position, The Y-axis direction represents energy, and each position of the double-layer light guide plate structure 1 displays the brightness energy of the position according to its color, and FIG. 6C is a schematic cross-sectional view of FIG. 6B, in which the darker line is horizontal. The cross section, the lighter line is the vertical cross section. As shown in FIG. 7A, the center of the double-layer light guide plate structure 1 is connected to the first support column 3 and the second support column 6, and the brightness distribution thereof is as shown in FIG. 7B, and FIG. 7C is the picture 7B. Schematic diagram of the section. As shown in FIG. 8A, the center of the double-layer light guide plate structure 1 is connected to the first support column 3 and the second support column 6, and the brightness distribution thereof is as shown in FIG. 8B, and FIG. 8C is the figure 8B. Schematic diagram of the section. It can be clearly seen from the foregoing drawings that no matter where the first support column 3, the second support column 6, the first pattern 25 and the second pattern 55 are disposed, there is little difference in energy variation, and there is no bright dark band or the like. The phenomenon occurs, and therefore, the arrangement of the first support post 3, the second support post 6, the first pattern 25, and the second pattern 55 does not affect the optical taste. Here, the diameters of the first support column 3 and the second support column 6 may be twice the diameter of the first pattern 25 and the second pattern 55, respectively (that is, the diameters of the first support column 3 and the second support column 6 are equal to The diameters of the first pattern 25 and the second pattern 55 are up to five times, and the first support column 3 and the second support column 6 do not affect the optical taste, wherein the diameters of the first support column 3 and the second support column 6 are relatively smaller. Preferably, it is less than or equal to three times the diameter of the first pattern 25 and the second pattern 55. For example, the diameter of the first pattern 25 and the second pattern 55 is 50 um, and the first support column 3 and the second support column 6 are The diameter is less than or equal to 250 um, preferably less than or equal to 150 um.

Figure 9 is a view showing an embodiment of the structure of the double-layer backlight module of the present invention. As shown in FIG. 9, in the first example of the present invention, the dual-layer backlight module structure comprises: double-layer light guide Plate structure 1, frame 8, and light source module 9.

The frame 8 is a substantially rectangular hollow frame for accommodating the double-layer light guide plate structure 1 so that the double-layer light guide plate structure 1 can be stably positioned at the hollow position of the frame 8. Here, the structure of the double-layer light guide plate structure 1 is the same as that of any of the foregoing embodiments, and will not be described herein.

The light source module 9 is preferably composed of a substrate 91 and a light-emitting element 92, and is positioned at the inner edge of the frame 8 between the double-layer light guide plate structure 1 and the frame 8, and is respectively directed toward the two-layer guide of the double-layer light guide plate structure 1. The light plate projects light such that the light is emitted from the first light-emitting surface 21 and the second light-emitting surface 51 of the double-layer light guide plate structure 1. The light source module 9 can be disposed on one side or both sides of the double-layer light guide plate structure 1 and can be changed according to design.

Fig. 10 is a view showing an embodiment of a method of manufacturing the double-layer light guide plate structure of the present invention. The manufacturing method of the double-layer light guide plate structure of the present invention comprises:

Step S1: The first light guide plate 2 and the plurality of first support columns 3 are emitted, and the plurality of first support columns 3 are disposed on the first light guide plate 2.

The first light guide plate 2 has a first light exit surface 21 and a first non-light exit surface 22 . The first support column 3 is integrally formed on the first non-light-emitting surface 22 of the first light guide plate 2, and the first support column 3 has a first top surface 31, and the first support column 3 is connected by the first non-light-emitting surface The surface 22 is linearly tapered toward the direction of the first top surface 31, and its structure and position are as described above, and will not be described again here.

In this step, the plurality of first patterns 25 may be further disposed on the first non-light-emitting surface 22 of the first light guide plate 2, or the first pattern 25 may be further disposed on the first top surface 31 of the first support pillar 3, in other words The first support column 3 may be provided in a pattern structure.

Step S2: The second light guide plate 5 and the plurality of second support columns 6 are emitted, and the plurality of second support 5 columns are disposed on the second light guide plate 6.

In this step, the second light guide plate 5 is made by injection molding or thermoforming. The second light guide plate 5 has a second light exit surface 51 and a second non-light exit surface 52. The plurality of second support columns 6 are integrally formed to form the second non-light-emitting surface 52 of the second light guide plate 5, and the second support column 6 has a second top surface 61, and the second support column 6 is connected by the second non-light-emitting surface The surface 52 is tapered in a straight line toward the second top surface 61. The structure and position thereof are as described above, and will not be described here.

In this step, the plurality of first patterns 55 may be further disposed on the second non-light-emitting surface 52 of the second light guide plate 5, or the first pattern 25 may be further disposed on the second top surface 61 of the second support column 6, in other words The second support column 6 may be provided in a pattern structure.

After the step S2, the method further includes: providing the reflector 7 and positioning on the second light guide plate 5. Here, the reflecting member 7 can be replaced by a reflective layer, which is not described here as described above.

The diameter of the first support column 3 and the second support column 6 may be one to five times the diameter of the first pattern 25 and the second pattern 55, wherein the first support column 3 and the second support column 6 are The diameter may preferably be less than or equal to three times the diameter of the first pattern 25 and the second pattern 55, as described above, and will not be described again herein.

Step S3: The first light guide plate 2 and the second light guide plate 5 are superposed so that each second support column 6 abuts against the corresponding first support column 3.

After the first light guide plate 2 and the second light guide plate 5 are stacked, the first non-light-emitting surface 22 of the first light guide plate 2 faces the second non-light-emitting surface 52 of the second light guide plate 5, so that each first The first top surface 31 of the support column 3 abuts against the second top surface 61 of each of the second support columns 6.

If the reflective member 7 is positioned on the second light guide plate 5 after the step S2, in this step, after the first light guide plate 2 and the second light guide plate 5 are stacked, the reflective member 7 is located at the first light guide plate 2 and Between the second light guide plates 5. As described above, the structure and position of the first support post 3 and the second support post 6 are different, and the two sides of the reflective member 7 are respectively attached to the first non-light-emitting surface 22 and the second non-light-emitting surface 52, or are reflected. The two sides of the member 7 are spaced apart from the first non-light-emitting surface 22 and the second non-light-emitting surface 52, respectively, and are not described here.

Step S4: Ultrasonic welding the first light guide plate 2 and the second light guide plate 5 so that each second support column 6 is integrated with the corresponding first support column 3.

The first light guide plate 2 and the second light guide plate 5 are placed on the ultrasonic welding machine, and the first light guide plate 2 and the second light guide plate 5 are ultrasonically welded to make the first top of the first support column 3 The surface 31 is strongly rubbed against the second top surface 61 of the corresponding second support post 6 to generate a local high temperature, so that the first top surface 31 and the second top surface 61 are melted and joined together. As described above, as the structure and position of the first support column 3 and the second support column 6 are different, the structure after the joint is different, and will not be described here.

In summary, according to the light guide plate structure and the manufacturing method thereof of the present invention, the double-layer light guide plates can be integrated to avoid collision with each other, and the overall strength is increased by the integrated structure. In addition, the first light guide plate and the second light guide plate can respectively adjust the optical quality, and it is easier to achieve the optical taste requirement.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the present invention. The invention is not limited to the spirit and scope of the invention, and may be modified and retouched. Therefore, the scope of patent protection of the present invention is subject to the scope of the patent application attached to the specification. .

1‧‧‧Double light guide plate structure

2‧‧‧First light guide

21‧‧‧The first glazing

22‧‧‧First non-illuminating surface

25‧‧‧ first pattern

3‧‧‧First support column

31‧‧‧First top surface

5‧‧‧Second light guide

51‧‧‧Second glazing

52‧‧‧Second non-illuminating surface

55‧‧‧second pattern

6‧‧‧Second support column

61‧‧‧Second top

7‧‧‧reflector

71/72‧‧‧ surface

8‧‧‧Frame

9‧‧‧Light source module

91‧‧‧Substrate

92‧‧‧Lighting elements

A1‧‧‧Double-sided display

A11‧‧‧Light guide plate

A12/A14‧‧‧Optical diaphragm

A13‧‧‧Upper panel

A15‧‧‧ lower panel

A16‧‧‧External framework

A2‧‧‧Double-sided display

A21‧‧‧Light guide plate

A22/A24‧‧‧Optical diaphragm

A23‧‧‧Upper panel

A25‧‧‧ lower panel

A26‧‧‧External framework

Figure 1 is a schematic view (1) of a conventional double-sided display structure.

Figure 2 is a schematic diagram of a conventional double-sided display structure (2).

Fig. 3A is a schematic view showing the first embodiment of the present invention before ultrasonic welding.

Figure 3B is a schematic view of the first embodiment of the present invention after ultrasonic welding.

Figure 3C is a schematic view of the deformation of the light guide plate (1).

Figure 3D is a schematic view of the deformation of the light guide plate (1).

Fig. 4A is a schematic view (1) showing a plurality of patterns in the present invention.

Figure 4B is a schematic view (2) of the present invention for setting a complex pattern.

4C is a top plan view of the first light guide plate of FIG. 4B.

Fig. 4D is a schematic view (3) of setting a complex pattern of the present invention.

Fig. 4E is a schematic view (4) showing the arrangement of a plurality of patterns in the present invention.

Figure 4F is a schematic view (5) of setting a complex pattern in the present invention.

Fig. 5A is a schematic view (1) showing a reflecting member according to a second embodiment of the present invention.

Fig. 5B is a schematic view (2) showing the arrangement of the reflecting member in the second embodiment of the present invention.

Fig. 5C is a schematic view (3) showing the arrangement of the reflecting member in the second embodiment of the present invention.

Figure 5D is a schematic view of the ray travel of the present invention.

Fig. 6A is a schematic view showing that the support column is not provided at the center in the present invention.

Figure 6B is a schematic diagram of the luminance distribution of Figure 6A.

Figure 6C is a schematic cross-sectional view of Figure 6B.

Fig. 7A is a schematic view showing the arrangement of microstructure patterns at the center of the present invention.

Figure 7B is a schematic diagram of the luminance distribution of Figure 7A.

Figure 7C is a schematic cross-sectional view of Figure 7B.

Figure 8A is a schematic view of the present invention in which a support column is disposed at the center.

Figure 8B is a schematic diagram of the luminance distribution of Figure 8A.

Figure 8C is a schematic cross-sectional view of Figure 8B.

Figure 9 is a schematic view showing the structure of the double-layer backlight module of the present invention.

Figure 10 is a flow chart showing the steps of the manufacturing method of the present invention.

1‧‧‧Double light guide plate structure

2‧‧‧First light guide

21‧‧‧The first glazing

22‧‧‧First non-illuminating surface

3‧‧‧First support column

31‧‧‧First top surface

5‧‧‧Second light guide

51‧‧‧Second glazing

52‧‧‧Second non-illuminating surface

6‧‧‧Second support column

61‧‧‧Second top

Claims (11)

A double-layer light guide plate structure, comprising: a first light guide plate, comprising a first first light-emitting surface and a first non-light-emitting surface, wherein the first light guide plate further comprises a plurality of first patterns, wherein the first non-light-emitting layer is located a plurality of first support columns on the first non-light-emitting surface; and a second light guide plate including a second light-emitting surface and a second non-light-emitting surface, the second non-light-emitting surface facing the first non-light-emitting surface a light-emitting surface, wherein the second light guide plate further comprises a plurality of second patterns on the second non-light-emitting surface, and the second light guide plate further comprises a plurality of second support columns on the second non-light-emitting surface; wherein The first support column is closer to the circumference of the first non-light-emitting surface than the first patterns, and the second support columns are closer to the circumference of the second non-light-emitting surface than the second patterns, and each of the first support columns Abutting the second light guide plate, each of the first support columns and the second light guide plate are integrally joined by ultrasonic welding to maintain a gap between the first light guide plate and the second light guide plate. . The double-layer light guide plate structure of claim 1, wherein the first support columns are located between the first patterns, and the second support columns are located between the second patterns. The double-layer light guide plate structure of claim 1, wherein the diameters of the first support columns are less than or equal to five times the diameter of the first patterns. The double-layer light guide plate structure of claim 1, further comprising: a reflective member positioned on the second light guide plate between the first non-light-emitting surface and the second non-light-emitting surface. The double-layer light guide plate structure of claim 4, wherein the reflective member further comprises a support post hole position or a shape design notch to avoid interference with the first support post or the second support post. The double-layer light guide plate structure of claim 4, wherein the first non-light-emitting surface and the second non-light-emitting surface are respectively attached to a surface of the reflective member. A method for manufacturing a double-layer light guide plate comprises: emitting a first light guide plate and a plurality of first support columns, wherein the first support columns are disposed on the first light guide plate, and setting a plurality of first patterns on the first On one side of the light guide plate, the first support columns are closer to the circumference of one surface of the first light guide plate than the first patterns; the second light guide plate is injected or hot pressed, and a plurality of second support columns are disposed on the first light guide plate a second light guide plate is disposed on one surface of the second light guide plate, and the second support columns are closer to a circumference of one side of the second light guide plate than the second patterns; a light guide plate and the second light guide plate, wherein each of the first support columns abuts the second light guide plate, and each of the second support columns abuts the corresponding first support column; and ultrasonically welds the The first light guide plate and the second light guide plate are integrally joined to each of the first support columns and the second light guide plate. The method of manufacturing the double-layer light guide plate according to claim 7, wherein after the step of emitting the first light guide plate and the first support columns, the method further comprises: providing a reflective member positioned on the second light guide plate on. The manufacturing method of the double-layer light guide plate structure according to claim 8, wherein in the step of superposing the first light guide plate and the second light guide plate, the reflection member is disposed on the first light guide plate and the first Between two light guide plates. The manufacturing method of the double-layer light guide plate structure according to claim 8, wherein the reflection member further comprises a support post hole position or a shape design notch to avoid interference with the first support column or the second support column. . A backlight module having a double-layer light guide plate, comprising: the double-layer light guide plate structure according to any one of claims 1-6; a frame for accommodating the double-layer light guide plate structure; and at least one light source module facing The double-layer light guide plate structure projects light to cause light to be emitted from the first light-emitting surface and the second light-emitting surface.