TWM462874U - Thin type backlight module, diffuser light guide plate and processing tool sets thereof - Google Patents

Description

Thin direct type backlight module, light guide plate with light-emitting function, and processing tool set thereof

The present invention relates to a backlight module, and in particular to a direct-lit backlight module.

The backlight module is an important component of the liquid crystal display panel. The structure of the direct-lit backlight module is a plurality of light-emitting diodes on the back surface of the light guide plate, and the light source is dispersed into an area light source through the light-expanding space, and then the front surface of the light guide plate is used. The diffuser adjusts the light intensity of the area source to form a uniform surface source.

However, if the diffuser is removed, even if various surface optics from the side-entry backlight module are applied to the surface of the light guide plate, it is necessary to arrange a light-expanding space far enough away between the light source and the light guide plate to provide sufficient light. The optical natural divergence path can barely achieve the surface light source that can be used for light uniformity.

One technical aspect of the present disclosure is to provide a thin direct-lit backlight module that can achieve a uniformity of light source without the need for a light-expanding space.

In an embodiment, a thin direct-lit backlight module includes a light guide plate, a light source, and a recess. The light source is located on the bottom surface of the light guide plate; On the top surface of the light guide plate, the shape of the groove starts from the top surface of the light guide plate and is curved toward the bottom surface of the light guide plate; for convenience of defining the feature, the light source has a 50% light intensity envelope, and the groove shape is oriented toward The bottom surface of the light guide plate is bent to end within the 50% light intensity envelope.

Thereby, the light type of the light source is guided in the light guide plate by the groove, so that when the light source is brought close to or even attached to the bottom surface of the light guide plate, there is no obvious light spot or dark spot on the top surface of the light guide plate.

In other embodiments of the present technical aspect, based on the 50% light intensity envelope of the selected specific light source, if the light source is of a centrally concentrated type, the shape of the groove may be designed to be the top of the light guide plate. The surface is curved toward the bottom surface and gradually steep; conversely, if the light pattern of the light source is diverging toward the side, the shape of the groove can be designed to be curved from the top surface of the light guide plate toward the bottom surface and gradually flattened. Further, the shape of the groove is preferably a smooth curve according to a side cross-section of the light guide plate; or a combination of two or more line segments having different slopes based on actual processing considerations, and within the line segment. When the circle is defined, the inscribed circle envelope is a smooth curve designed by the light type.

In addition, in view of the positive cross-section of the light guide plate, in order to achieve the above-mentioned technical objective of guiding the light type of the light source to the lateral direction in the light guide plate, the shape of the groove can be designed to be circular; it is worth noting that The position of the light guide plate is different, for example, at the center or near the edge, and the shape of the groove can also be designed as a circular ellipse or egg shape, so as to obtain uniform light distribution of the light guide plate.

Specifically, the thin direct type backlight module of the technical aspect is in an embodiment, and the design data is as follows: the groove depth is 50-95% of the thickness of the light guide plate, and the surface opening area of the groove is the light source body. 30-90 times the area to choose from or take For compounding.

In a further embodiment, a thin direct-type backlight module of the present invention is proposed to form a sandwich interface inside the light guide plate. The interlayer interface ring is disposed around the groove to help enhance luminous flux and Evenness. For example, the interlayer interface can be an air gap.

In other embodiments, a surface microstructure is formed on the top surface of the light guide plate at the periphery of the groove, which can be used to finely adjust the amount of light according to the change of the arrangement density or the change of the structure depth. The technical means is very practical when processing a thin direct type backlight module according to the technical aspect of the present invention. In the embodiments, the surface microstructures of different specifications can be used to adjust the light guide plates of different batch quantities and The groove is used to achieve product uniformity and improve process stability. Similarly, the application of the surface microstructure technology can also be applied to the surface of the groove, that is, a groove microstructure formed on the surface of the groove, and the groove microstructure can be a plurality of wavy ridges or surface scraping. The mark helps to solve the doubts of the central dark spot when the main technical means of the technical aspect, that is, the effect of changing the light pattern by the shape of the groove is too good.

Finally, the technical aspect of the present invention provides a general design of the bottom surface of the light guide plate in various embodiments for selection according to requirements. Taking an embodiment as an example, the technical aspect proposes an inverted V-shaped groove formed on the bottom surface of the light guide plate and facing the light source. The opening diameter of the inverted V-shaped groove is 1/3-1/ of the length of the body of the light source. 10. At this particular size, the inverted V-shaped groove can beneficially destroy the original light pattern of the light source. Taking another embodiment as an example, the technical aspect provides an inverted V-shaped groove formed on the bottom surface of the light guide plate and facing the light source, but the opening diameter of the inverted V-shaped groove is equivalent to the length of the body of the light source, without Further destroying the original light pattern of the light source so that it diverges laterally, the inverted V-shaped groove can In order to increase the amount of light source light that can be applied to the top surface of the light guide plate. Of course, taking another embodiment as an example, in consideration of the small thickness requirement of the overall thin direct type backlight module, the present technical aspect proposes a receiving groove formed on the bottom surface of the light guide plate to accommodate the body of the light source.

Another technical aspect of the present disclosure is to provide a light guide plate having a light-expanding function, which can directly connect the light source to the bottom surface of the light guide plate, and still present a uniform surface light source on the top surface of the light guide plate.

In an embodiment, a light guide plate with a light-expanding function is provided for mounting at least one light source on the bottom surface, guiding the light source to emit light on the top surface, and when the light source is close to the bottom surface, the top surface has no significant light. point. The light guide plate with light-expanding function comprises a body and a groove; the body is plate-shaped and can transmit light; the groove is formed on the top surface of the body, and is viewed along a side of the body, and the shape of the groove starts from The top surface of the body is curved toward the bottom surface of the body.

The technical aspect is in other embodiments, and the general design of the bottom surface of the light guide plate is proposed for selection according to requirements. Taking an embodiment as an example, the technical aspect proposes an inverted V-shaped groove formed on the bottom surface of the light guide plate and facing the light source. The opening diameter of the inverted V-shaped groove is 1/3-1/ of the length of the body of the light source. 10. At this particular size, the inverted V-shaped groove can beneficially destroy the original light pattern of the light source. Taking another embodiment as an example, the technical aspect provides an inverted V-shaped groove formed on the bottom surface of the light guide plate and facing the light source, but the opening diameter of the inverted V-shaped groove is equivalent to the length of the body of the light source, without In the case of further damaging the original light pattern of the light source so as to diverge laterally, the inverted V-shaped groove can increase the amount of light source that can be applied to the groove on the top surface of the light guide plate. Of course, taking another embodiment as an example, considering the small thickness requirement of the overall thin direct type backlight module, the technical state A receiving groove is formed on the bottom surface of the light guide plate to accommodate the body of the light source.

In other embodiments of the present technical aspect, based on the 50% light intensity envelope of the selected specific light source, if the light source is of a centrally concentrated type, the shape of the groove may be designed to be the top of the light guide plate. The surface is curved toward the bottom surface and gradually steep; conversely, if the light pattern of the light source is diverging toward the side, the shape of the groove can be designed to be curved from the top surface of the light guide plate toward the bottom surface and gradually flattened. Further, the shape of the groove is preferably a smooth curve according to a side cross-section of the light guide plate; or a combination of two or more line segments having different slopes based on actual processing considerations, and within the line segment. When the circle is defined, the inscribed circle envelope is a smooth curve designed by the light type.

In addition, in view of the positive cross-section of the light guide plate, in order to achieve the above-mentioned technical objective of guiding the light type of the light source to the lateral direction in the light guide plate, the shape of the groove can be designed to be circular; it is worth noting that The position of the light guide plate is different, for example, at the center or near the edge, and the shape of the groove can also be designed as a circular ellipse or egg shape, so as to obtain uniform light distribution of the light guide plate.

Specifically, in one embodiment, the light guide plate having the light-expanding function of the present technical aspect proposes that the design data is as follows, the groove depth is 50-95% of the thickness of the light guide plate, and the surface opening area of the groove is a light source. The body area is 30-90 times, which can be used as an alternative or mixed.

In a further embodiment, a light guide plate with a light-expanding function is proposed in the embodiment, and a meso-layer interface is formed on the periphery of the groove to help increase the luminous flux. With uniformity. For example, the interlayer interface can be an air gap.

In other embodiments, a surface microstructure is formed on the top surface of the light guide plate at the periphery of the groove, which can be used to finely adjust the amount of light according to the change of the arrangement density or the change of the structure depth. The technical means is very practical when processing a thin type of direct type backlight module according to the technical aspect of the present invention; the surface microstructure of different specifications can be used to adjust the light guide plate and the groove of different batches of mass production to realize Product uniformity, improve process stability. Similarly, the application of the technical means can also be applied to the surface of the groove, that is, a groove microstructure formed on the surface of the groove, and the groove microstructure can be a plurality of wavy ridges or surface scratches, which helps When the main technical means of the technical aspect, that is, the effect of changing the light pattern by the shape of the groove is too good, the doubt of the central dark spot is solved.

Another technical aspect of the present disclosure is to provide a thin direct type backlight module, which can achieve a light source uniformity without using a light-expanding space.

In an embodiment, a thin direct-type backlight module is provided for mounting at least one light source on the light-incident surface, guiding the light source to emit light on the light-emitting surface, and when the light source is close to the light-incident surface, the light-emitting surface is not Significant light spot. The thin direct type backlight module comprises a light guide plate and a groove; the groove is formed on the light exit surface of the light guide plate, and the groove is formed by a side cross section, and the two side walls form an angle at the bottom of the groove. 70-90 degrees, and any of the side walls has a first bent portion and at least one second bent portion. The first bending portion is located near the light emitting surface, and the first bending portion forms a first inner angle in the light guide plate, the first inner angle is 160-165 degrees; the second bending portion is opposite to the first bending portion The first bending portion is located away from the light emitting surface, and the second bending portion forms a second inner angle in the light guiding plate, and the second inner angle is 140-155 degrees.

Furthermore, the sidewall of the recess of the thin direct type backlight module may further include a third The bending portion is located away from the light-emitting surface relative to the second bending portion, and the third bending portion forms a third internal angle in the light guide plate, and the third internal angle is 135--150 degrees. Thereby, the inscribed circle of the line segments between the bent portions can form an inscribed circle envelope, and the inscribed circle envelope is a smooth curve designed according to the light type, and further theoretical derivation is taken into consideration. The ideal state and the actual needs of practical industrial processing.

The technical aspect is in other embodiments, and the general design of the bottom surface of the light guide plate is proposed for selection according to requirements. Taking an embodiment as an example, the technical aspect proposes an inverted V-shaped groove formed on the bottom surface of the light guide plate and facing the light source. The opening diameter of the inverted V-shaped groove is 1/3-1/ of the length of the body of the light source. 10. At this particular size, the inverted V-shaped groove can beneficially destroy the original light pattern of the light source. Taking another embodiment as an example, the technical aspect provides an inverted V-shaped groove formed on the bottom surface of the light guide plate and facing the light source, but the opening diameter of the inverted V-shaped groove is equivalent to the length of the body of the light source, without In the case of further damaging the original light pattern of the light source so as to diverge laterally, the inverted V-shaped groove can increase the amount of light source that can be applied to the groove on the top surface of the light guide plate. Of course, taking another embodiment as an example, in consideration of the small thickness requirement of the overall thin direct type backlight module, the present technical aspect proposes a receiving groove formed on the bottom surface of the light guide plate to accommodate the body of the light source.

In addition, in view of the positive cross-section of the light guide plate, in order to achieve the above-mentioned technical objective of guiding the light type of the light source to the lateral direction in the light guide plate, the shape of the groove can be designed to be circular; it is worth noting that The position of the light guide plate is different, for example, at the center or near the edge, and the shape of the groove can also be designed as a circular ellipse or egg shape, so as to obtain uniform light distribution of the light guide plate.

Specifically, the thin direct type backlight module of the technical aspect is in an embodiment, and the design data is as follows, the groove depth is 50-95% of the thickness of the light guide plate, and the second bend The depth of the folded portion is 25-85% of the thickness of the light guide plate, the surface open area of the groove is 30-90 times the area of the light source body, and the cross-sectional area of the second bent portion is 16-48 times the area of the light source body, Optional or mixed.

In a further embodiment, a thin direct-type backlight module of the present invention is proposed to form a sandwich interface inside the light guide plate. The interlayer interface ring is disposed around the groove to help enhance luminous flux and Evenness. For example, the interlayer interface can be an air gap.

In other embodiments, a surface microstructure is formed on the top surface of the light guide plate at the periphery of the groove, which can be used to finely adjust the amount of light according to the change of the arrangement density or the change of the structure depth. The technical means is very practical when processing a thin type of direct type backlight module according to the technical aspect of the present invention; the surface microstructure of different specifications can be used to adjust the light guide plate and the groove of different batches of mass production to realize Product uniformity, improve process stability. Similarly, the application of the technical means can also be applied to the surface of the groove, that is, a groove microstructure formed on the surface of the groove, and the groove microstructure can be a plurality of wavy ridges or surface scratches, which helps When the main technical means of the technical aspect, that is, the effect of changing the light pattern by the shape of the groove is too good, the doubt of the central dark spot is solved.

Another technical aspect of the present disclosure is to provide a thin direct type backlight module processing tool set to realize the processing of the above-mentioned thin direct type backlight module or light guide plate with light-expanding function.

In an embodiment, the present invention provides a thin direct type backlight module processing tool set for processing a thin direct type backlight module as described above. Processing tool The group includes a first tool and a second tool. The first tool is centered on the position of the light source, and feeds the light guide plate to form an angle of 70-90 degrees between the two sidewalls of the bottom of the groove; the second tool system Off-axis to the first cutter, the light guide plate is fed to form the first bent portion and the second bent portion.

In other embodiments of the present technical aspect, the second tool may be an annular cutter or may be designed to connect the first cutter to the body. Furthermore, the feed depth of the second tool can be designed to be 60-80% of the feed depth of the first tool. Alternatively, the first tool and the second tool may alternatively or entirely be designed as a rotary feed tool.

In the first embodiment, a thin direct type backlight module processing tool set is proposed for processing the thin direct type backlight module as described above. The machining tool set includes a first tool and a second tool. The first tool is centered on the position of the light source, and feeds the light guide plate to form an angle of 70-90 degrees between the two sidewalls of the bottom of the groove; the second tool system The light guide plate is fed to the first cutter at 140-150 degrees to form the first bent portion and the second bent portion.

In other embodiments in conjunction with the above embodiments, the second tool may be designed to connect the first tool to the body; in addition, the feed depth of the second tool may be designed to be 60-80% of the feed depth of the first tool; In one aspect, the first tool and the second tool may alternatively or entirely be designed as a rotary feed tool.

Another technical aspect of the present disclosure is to provide a thin direct-lit backlight module that can realize a surface light source without leaving a light-expanding space between the light source and the light guide plate.

In an embodiment, the present invention provides a thin direct type backlight module. The light source is used to install at least one light source on the light incident surface, and the light source is guided to emit light on the light exit surface, and when the light source is close to the light incident surface, the light exit surface has no significant light spot. The thin direct type backlight module comprises a light guide plate, a groove and an inverted V-shaped groove; the groove is formed on the light exit surface of the light guide plate, and the groove is formed by a side cross section, and the two side walls are formed by the two side walls. The bottom of the groove forms an angle of 70-90 degrees, and the shape of the groove is a circular shape of the light guide plate. The depth of the groove is 50-95% of the thickness of the light guide plate, and the surface opening area of the groove is 30-90 times the area of the light source body. Any one of the side walls of the recess has a first bent portion and at least one second bent portion. The first bent portion is located near the light exit surface, and the first bent portion forms a first inner angle in the light guide plate. An inner angle is 160-165 degrees; the second bending portion is located away from the light exit surface relative to the first bending portion, and the second bending portion forms a second inner angle in the light guide plate, and the second inner angle is 140 -155 degrees; claiming that the depth of the second bending portion is 25-85% of the thickness of the light guide plate, and the sectional area of the second bending portion is 16-48 times the area of the light source body. Finally, the inverted V-shaped groove is formed on the light incident surface of the light guide plate and faces the light source, and the opening diameter of the inverted V-shaped groove corresponds to the length of the body of the light source.

In a further embodiment, the thin direct-type backlight module of the present technology proposes a technical means for forming a sandwich interface inside the light guide plate, and the interlayer interface ring is disposed around the groove to help improve luminous flux and uniformity. . For example, the interlayer interface can be an air gap.

In other embodiments, a surface microstructure is formed on the top surface of the light guide plate at the periphery of the groove, which can be used to finely adjust the amount of light according to the change in the arrangement density or the change in the depth of the structure. This technical means is very practical when processing a thin type of direct type backlight module according to the technical aspect of the present invention; The structure adjusts the light guide plate and the groove of different batches of mass production to achieve product uniformity and improve process stability. Similarly, the application of the technical means can also be applied to the surface of the groove, that is, a groove microstructure formed on the surface of the groove, and the groove microstructure can be a plurality of wavy ridges or surface scratches, which helps When the main technical means of the technical aspect, that is, the effect of changing the light pattern by the shape of the groove is too good, the doubt of the central dark spot is solved.

The present invention overcomes the disadvantages of the conventional direct type backlight module in terms of volume, especially thickness, by the structural features of the above embodiments; on the other hand, it also takes into consideration the quality of the production line during manufacturing. The requirements of stability and homogeneity, and the technical means of matching and selecting multiple sets are proposed.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the detailed description of the invention and the accompanying drawings.

0100, 0101‧‧‧ light source

0210‧‧‧ Ontology

0201, 0202‧‧‧ Thin type direct type backlight module

0231‧‧‧ angle

0241‧‧‧First bend

0242‧‧‧Second bend

0402‧‧‧Right view

0421‧‧‧ Groove microstructure

0500, 0501‧‧‧ machining tool set

0520, 0521‧‧‧ second tool

0110‧‧‧ envelope

0200, 0211, 0212, 0213, 0400, 0410‧‧‧ light guide

0220, 0221, 0222, 0223, 0420‧‧‧ grooves

0401‧‧‧Overhead angle

0403‧‧‧left perspective

0430, 0431‧‧‧ inverted V-shaped groove

0510, 0511‧‧‧ first tool

0601‧‧‧ Highlights

FIG. 1 is a schematic structural view of a light guide plate having a light-expanding function according to an embodiment of the present disclosure.

FIG. 2 is a schematic structural view of a thin direct type backlight module according to an embodiment of the present disclosure.

FIG. 3 is a side cross-sectional view of the thin direct type backlight module 0201 of FIG.

FIG. 4 is a schematic structural view of a thin direct type backlight module according to still another embodiment of the present disclosure.

FIG. 5 is a diagram showing a light pattern of the light source 0100.

Figure 6 is a schematic diagram showing the structure of the experimental parameter environment.

Figure 7 is a schematic view showing the structure of the first control group.

Figure 8 is a graph showing the light intensity distribution of the first control group.

Figure 9 is a schematic view showing the structure of the second control group.

Figure 10 is a graph showing the light intensity distribution of the second control group.

Figure 11 is a schematic view showing the structure of the first experimental group.

Figure 12 is a diagram showing the light intensity distribution of the first experimental group.

Figure 13 is a schematic view showing the structure of the second experimental group.

Figure 14 is a schematic view showing the structure of the second experimental group.

Figure 15 is a light pattern diagram of a light emitting diode LED light source having a secondary lamp cup designed for lateral illumination.

Figure 16 is a schematic view showing the structure of the first control group in combination with the secondary lamp cup.

Figure 17 is a graph showing the light intensity distribution of the first control group in combination with the secondary lamp cup.

Figure 18 is a schematic view showing the structure of the second control group in combination with the secondary lamp cup.

Figure 19 is a graph showing the light intensity distribution of the second control group in combination with the secondary lamp cup.

Figure 20 is a schematic view showing the structure of the first experimental group in combination with the secondary lamp cup.

Figure 21 is a diagram showing the light intensity distribution of the first experimental group in combination with the secondary lamp cup.

FIG. 22 is a diagram showing a junction of a light guide plate having a light-expanding function according to still another embodiment of the present disclosure. Schematic diagram.

FIG. 23 is a schematic structural view of a light guide plate having a light-expanding function according to still another embodiment of the present disclosure.

FIG. 24 is a schematic view showing the structure of a light guide plate having a light-expanding function according to another embodiment of the present disclosure.

FIG. 25 is a schematic structural view of a groove microstructure according to an embodiment of the present disclosure.

FIG. 26 is a schematic structural view of a groove microstructure of another embodiment of the present disclosure.

FIG. 27 is a schematic structural view of a thin direct type backlight module processing tool set according to an embodiment of the present disclosure.

FIG. 28 is a schematic structural view of a thin direct type backlight module processing tool set according to another embodiment of the present disclosure.

Figure 29 is a schematic view showing the structure of an experimental case.

Figure 30 is a diagram showing the geometry of the two-stage groove of another experimental case of the present disclosure.

FIG. 31 is a structural diagram of a segmented groove design of still another experimental case of the present disclosure.

Figure 32 is a schematic view showing the structure of the third control group.

Figure 33 is a graph showing the light intensity distribution of the third control group.

Figure 34 is a schematic diagram showing the uniformity distribution of the third control group.

Figure 35 is a schematic view showing the structure of the third experimental group.

Figure 36 is a diagram showing the light intensity distribution of the third experimental group.

Figure 37 is a schematic diagram showing the uniformity distribution of the third experimental group.

Please refer to FIG. 1 , which is a schematic structural view of a light guide plate with a light-expanding function according to an embodiment of the present invention. For convenience of explanation, the light source 0100 is further illustrated. In Fig. 1, the light guide plate 0200 is composed of a body 0210 and a groove 0220. The relative position is shown in the figure, and will not be described. The light source 0100 is usually a point light source, which can be realized by a light-emitting diode, but it is not excluded that the body 0210 has a flat shape and can transmit light, usually by acrylic ( PMMA) or plastic (PC), but does not exclude other equivalents; for example, the sheet may be acrylic resin (Acrylic Resin), cycloolefin polymer (COC), polymethyl methacrylate (PMMA), polycarbonate At least one of a material group consisting of (PC), polyetherimide, Fluorocarbon Polymer, or Silicone or other alternative material.

In other words, in a special application, the body 0210 can also be a wave plate. The light source 0100 is mounted on the bottom surface of the body 0210, and the groove 0220 is formed on the top surface of the body 0210 for guiding the light source 0100 to emit light on the top surface of the body 0210, so that the relative positions of the two are matched. On the other hand, if the light source 0100 is changed to a line light source, such as a light bar, the groove 0220 is also changed to a narrow groove to correspond to the light type provided by the light source 0100, but does not deviate from the novel teaching and request law. protected range. It should be noted that, along the side of the body 0210, the shape of the groove 0220 starts from the top surface of the body 0210 and is curved toward the bottom surface of the body 0210 to match the light-emitting pattern of the light source 0100; thereby, the groove 0220 The light pattern can be diverged toward the side in the body 0210, and when the light source 0100 is close to the bottom surface, There is no significant spot on the top surface. Moreover, the light source 0100 is directly attached to the bottom surface of the light guide plate 0200, and a uniform surface light source can still be present on the top surface of the light guide plate 0200, thereby realizing the possibility that the diffusion plate is not required or the diffusion particles are broken into the body 0210.

Viewed from another perspective, the light guide plate having the light-expanding function can also be defined as a thin direct-type backlight module in another embodiment. Please refer to FIG. 2 , which is a schematic structural view of a thin direct type backlight module according to an embodiment of the present invention. In the second embodiment, the thin direct type backlight module 0201 includes a light guide plate 0211, a light source (not shown), and a recess 0221. The light source is located on the bottom surface of the light guide plate 0211; the groove 0221 is located on the top surface of the light guide plate 0211, and the shape of the groove 0221 is as shown in the embodiment of FIG. 1 , starting from the top surface of the light guide plate 0211 and facing the bottom surface of the light guide plate 0211. For the convenience of defining the features, please refer to FIG. 3, which is a side cross-sectional view of the thin direct type backlight module 0201 of FIG. 2, which shows the original light type of the light source 0100 and the guide of the embodiment. The relative position of the groove 0221 of the light plate 0211, and the light pattern after the action of the groove 0221 is not shown. In FIG. 3, the light source 0100 has a 50% light intensity envelope 0110, and the shape of the groove 0221 is curved toward the bottom surface of the light guide plate 0211 and ends in the 50% light intensity envelope 0110. Thereby, the light type of the light source 0100 is guided in the light guide plate 0211 by the groove 0221, so that when the light source 0100 is brought close to or even attached to the bottom surface of the light guide plate 0211, there is no significant spot or darkness on the top surface of the light guide plate 0211. point. It should be noted that since the light source 0100 is located directly under the groove 0221 in the present embodiment, it is easy to understand that a bright spot or an aperture appears near the center of the groove 0221; however, in fact, the vicinity of the center of the groove 0221 may also appear. The production of dark spots or dark bands, dark spots or dark bands is unrealistic and unimaginable. It is a flaw that is not easy to detect under technical prejudice and will be explained in the appropriate paragraphs.

According to the above, from the perspective of the implementation, it is not easy to process the groove 0221 having a curved surface on the large-sized light guide plate 0211. Therefore, please refer to FIG. 4, which is another embodiment of the present invention. The structure diagram of the thin direct type backlight module. In the fourth embodiment, the thin direct type backlight module 0202 includes a light guide plate 0212 and a groove 0222; the groove is formed on the light exit surface of the light guide plate 0212, and the groove 0222 is formed by a side cross section, and is composed of two side walls. The two side walls form an angle 0231 of about 70-90 degrees at the bottom of the groove, and any of the side walls has a first bent portion 0241 and at least one second bent portion 0242. The first bending portion 0241 is located near the light emitting surface, and the first bending portion 0241 forms a first inner angle in the light guide plate 0212, and the first inner angle is 160-165 degrees; the second bending portion The second bending portion 0242 is formed in the light guide plate 0212 to form a second inner angle, and the second inner angle is 140-155 degrees. The above design data has profound meanings, rather than the application of conventional means or general design concepts. It is explained as follows: Technically, the creators of this new type have tried their best and tried many ways, and the new creations have practical value and teaching contribution. The technical solution, the development history and experimental data are described for the subsequent implementation and optimization of the following: First, to establish the experimental environment, please refer to Figure 5, which is the optical package of the light source 0100. From the light pattern diagram of the selected light source 0100, it can be seen that the main light intensity distribution range is above 36 degrees, which is indicated by the double arrow in the figure. Please refer to Figure 6 again, which is a schematic diagram of the structure of the experimental parameter environment. In Fig. 6, the thickness of the light guide plate is selected to be 6 mm, and three measurement positions are defined, that is, the direction of the light intensity sensing device is as shown by the arrow, and is sequentially a viewing angle 0401, a right viewing angle 0402, and a left viewing angle 0403.

Then, set up the first control group as follows: directly with the unprocessed light guide plate, the bottom surface is attached The light source was combined, and the experimental results are shown in Fig. 7 and Fig. 8. Fig. 7 is a schematic view showing the structure of the first control group, and Fig. 8 is a light intensity distribution diagram of the first control group. As can be seen from Figure 8, the specific measurement results are:

Top view angle 0401: 903.883 lumens (lm-Flux on Irradiance/Illuminance map)

Right view 0402: 0 lumens (lm-Flux on Irradiance/Illuminance map)

Left view 0403: 0 lumens (lm-Flux on Irradiance/Illuminance map)

Next, the second control group is set up as follows: If the light shape of the light source is guided by a V-shaped groove with a solid cone, the Snell's Law and the Total Reflection Theorem (TIR) are derived as follows: n1sinθ1 =n2sinθ2

Nsinθc=N'sinθ90°

Take the refractive index of polymethyl methacrylate (PMMA) as an example, according to the formula:

The total reflection angle is 42.15 degrees. Therefore, as mentioned above, since the selected light source 0100 has a main light intensity distribution range of 36 degrees or more, the total reflection angle condition is selected to be 36 degrees, and further derivation is as follows: 1.49sin36°=sinθm

Θm=61°

Θc=61*2=122°

The V-shaped groove of this design can be angled at an angle of 122 degrees. The light is reversed in the medium, that is, the optical path of the light guide body, and the displacement is as follows:

Wherein, the d parallel light displacement amount formula can be used to further calculate the depth, that is, the V-shaped groove depth, and t is the thickness of the light guide plate; here, the V-shaped groove depth is calculated to be 5.5 mm and the angle is 122 degrees. The experimental results are shown in Fig. 9 and Fig. 10. Fig. 9 is a schematic view showing the structure of the second control group, and Fig. 10 is a light intensity distribution diagram of the second control group. From the experimental results of the second control group, it can be seen that the light flux distribution can be obtained by simply operating in a V-shaped cone:

Top view angle 0401: 480.241 lumens (lm-Flux on Irradiance/Illuminance map)

Right view 0402: 201.998 lumens (lm-Flux on Irradiance/Illuminance map)

Left view 0403: 198.801 lumens (lm-Flux on Irradiance/Illuminance map)

Next, the first experimental group taught by the embodiment is measured, and its structure is as shown in FIG. The two-stage structural design of the groove 0222 is taught by the embodiment. The structural parameters are: the first section has a bending depth of 4 mm, the second section has a bending depth of 1.5 mm, and the total depth is 5.5 mm. The fold has a virtual angle of 122 degrees and a bottom angle of 95 degrees. The experimental results are shown in Fig. 11 and Fig. 12, and Fig. 11 is a schematic structural view of the first experimental group, and Fig. 12 is a light intensity distribution diagram of the first experimental group. From the experimental results, the luminous flux distribution is:

Top view angle 0401: 261.431 lumens (lm-Flux on Irradiance/Illuminance map)

Right view 0402: 306.822 lumens (lm-Flux on Irradiance/Illuminance map)

Left view 0403: 306.564 lumens (lm-Flux on Irradiance/Illuminance map)

Next, the second experimental group taught by the embodiment is measured with structural parameters: a first section bending depth of 3 mm, a second section bending depth of 2 mm, a total depth of 5 mm, and a second angle of the second bending portion of the two side walls of the groove. 140 degrees, the bottom angle is 75 degrees. The experimental results are shown in Figures 13 and 14, Figure 13 is a schematic diagram of the structure of the second experimental group, and Figure 14 is a light intensity distribution diagram of the second experimental group. From the experimental results, the luminous flux distribution is:

Overlook angle 0401: 477.731 lumens (lm-Flux on Irradiance/Illuminance map)

Right view 0402: 63.9789 lumens (lm-Flux on Irradiance/Illuminance map)

Left view 0403: 64.265 lumens (lm-Flux on Irradiance/Illuminance Map)

Therefore, in this embodiment, we can simply conclude that the simulation can be carried out by using a common light-emitting diode LED light source. It can be found that all the light is directly emitted from the center directly above before the structure taught by the embodiment is added. The luminous flux on the upper side can reach 900lm, and the central light intensity reaches 20000000lx. The light pattern after simply adding the V structure can see the light guiding around, the luminous flux on the upper side is reduced by nearly 50%, the central light intensity is reduced by 60%, and the surrounding luminous flux is also reduced. From 0 to 200 lm, it proves that although it has the effect of guiding light and reducing the central bright circle, it is not useful. With the two-stage structure taught in this embodiment, the central intensity is 30%, and the overall uniformity is 85%. The diameter of the structure needs to be larger than the diameter of the light-emitting surface and the deeper the depth, the greater the effect is more obvious, and the multi-segment structure can be used to adjust the effect.

To put it bluntly, if we choose the light source type, we can design it more accurately. For example, choose a light-emitting diode with a secondary lamp cup: please refer to Figure 15, which is a design with lateral illumination. The light pattern of the LED light source of the secondary lamp cup is applied to the light-emitting diode as the light source 0100. The simulation results are as follows in the first control group, the second control group and the experimental group: The simulation results of the first control group in combination with the secondary lamp cup are shown in Figs. Fig. 16 is a schematic view showing the structure of the first control group combined with the secondary lamp cup, and Fig. 17 is a diagram showing the light intensity distribution of the first control group combined with the secondary lamp cup. Its luminous flux distribution is:

Overlook angle 0401: 696.567 lumens (lm-Flux on Irradiance/Illuminance map)

Right view 0402: 0 lumens (lm-Flux on Irradiance/Illuminance map)

Left view 0403: 0 lumens (lm-Flux on Irradiance/Illuminance map)

The simulation results of the second control group in combination with the secondary lamp cup are shown in Figs. Fig. 18 is a schematic view showing the structure of the second control group in combination with the secondary lamp cup, and Fig. 19 is a diagram showing the light intensity distribution of the second control group in combination with the secondary lamp cup. Its luminous flux distribution is:

Overlook angle 0401: 168.262 lumens (lm-Flux on Irradiance/Illuminance map)

Right view 0402: 238.308 lumens (lm-Flux on Irradiance/Illuminance map)

Left view 0403: 237.084 lumens (lm-Flux on Irradiance/Illuminance map)

The simulation results of the first experimental group combined with the secondary lamp cup are shown in Figs. Figure 20 is a schematic view showing the structure of the first experimental group combined with the secondary lamp cup, and Fig. 21 is a light intensity distribution diagram of the first experimental group combined with the secondary lamp cup. Its luminous flux distribution is:

MW-Flux on Irradiance/Illuminance map

Right view 0402: 289.55 lumens (lm-Flux on Irradiance/Illuminance map)

Left view 0403: 290.727 lumens (lm-Flux on Irradiance/Illuminance map)

Accordingly, the present embodiment obtains the following verification conclusion: a more significant effect can be seen by adding the light source 0100 of the secondary lamp cup, and the central bright ring is lowered after the structure taught in the embodiment. At times, the central luminous flux is reduced by 76%, confirming that its light guiding effect and the reduction of the central hotspot are amazing. However, the secondary lamp cup is not a contribution of this new type, although it is beneficial to further enhance the overall goal of the desired result, but it is not my generation. For the developer of the light guide plate structure design; easy to say, from the perspective of the industry chain, the two technical fields are far apart, but only in the terminal products have complementary effects, just like the computer's memory settings The virtual memory is planned on the CPU or the motherboard or on the hard disk. In terms of product results, it seems to be the same, but in reality it is very different. For example, industrial design must consider mass production. Because of its small size, the lamp cup can be processed by injection molding. However, due to the large volume of the light guide plate, there is no possibility of large-scale processing by injection molding. Further description will be given later. The novel embodiments are incapable of realizing or transferring technology to a small-sized injection-molded lamp cup in a large-scale production of a large-sized light guide plate. Therefore, the novel creator proposes that the structure of the light guide plate that replaces the effect of the lamp cup is as follows, and the machining tool set that actually applies the groove on the light guide plate is as follows: In the design of the light guide plate that replaces the effect of the lamp cup, firstly, It is stated that the lamp cup guiding the light laterally may not be able to form a uniform surface light source on the top surface of the light guide plate. The so-called too long, in the new experiment of the present creator, it often leads to the appearance of the central dark spot; The reason is that when the reflection ability of the groove is too strong, a dark spot appears in the center; when the light is too concentrated, a bright spot appears in the center, and then the side is accompanied by a dark band and a bright circle. These phenomena have basically no solution on the lamp cup, and can only be processed by the process parameters of strict control, which is not a technical means of teaching. However, in the mass production of large-sized light guide plate technology, the new creator has considerable teaching and technical means, which will be explained later.

Therefore, referring to the design concept, please refer to FIG. 22, which is a schematic structural view of a light guide plate with a light-expanding function according to still another embodiment of the present disclosure, as described above, a light guide plate with a light-expanding function or a thin type The direct type backlight module is characterized in that The groove is curved from the top to the bottom surface and enters the 50% light intensity envelope of the light source. Based on the 50% light intensity envelope of the selected specific light source, if the light source is of a centrally concentrated type, the shape of the groove taught by the present invention can be designed to be curved from the top surface of the light guide plate toward the bottom surface and Conversely, as shown in Fig. 22, if the light source of the light source 0101 is diverging toward the side, the shape of the groove 0223 can be designed to be curved from the top surface of the light guide plate 0213 toward the bottom surface and gradually flattened. Further, the shape of the groove is viewed from the side of the light guide plate, and is ideally designed as a smooth curve to match the light type of the light source. However, in the actual processing considerations, it should be designed as an inscribed circular envelope of two or more different slopes, and the inscribed circular envelope is a smooth curve designed according to the light type. The definition and design of the envelope and smooth curve are left to be explained later when the design concept of the third bending part is explained.

Next, if you consider the design of the bottom surface of the light guide plate instead of the special size secondary lamp cup, the new creator proposes at least three design concepts for the sake of illustration, for the late research and development personnel to choose according to requirements. Please refer to FIG. 23 , which is a schematic structural view of a light guide plate with a light-expanding function according to still another embodiment of the present invention. Of course, it can also be applied to the thin direct type backlight module. In Fig. 23, the light guide plate 0400 having the light-expanding function has an inverted V-shaped groove 0430 formed on the bottom surface of the light guide plate 0410 and facing the light source 0100. The opening diameter of the inverted V-shaped groove 0430 is the body length of the light source 0100. 1/3-1/10, at this particular size, the inverted V-shaped groove 0430 can beneficially destroy the original light pattern of the light source, making it close to the light-emitting diode of the secondary lamp cup shown in Fig. 13. Light type.

Please refer to FIG. 24 again, which is a schematic structural view of a light guide plate with a light-expanding function according to another embodiment of the present invention. In Fig. 24, an inverted V-shaped groove 0431 is formed on the light guide plate The bottom surface of 0410 faces the light source 0100, but the opening diameter of the inverted V-shaped groove 0431 corresponds to the length of the body of the light source 0100, and in the case where the original light type of the light source 0100 is not further damaged, so that it is diverged laterally, this The inverted V-shaped groove 0431 can raise the amount of light of the light source that the top surface of the light guide plate 0410 can act. It should be noted that the inverted V-shaped groove 0431 will instead be too concentrated when the light source 0100 is concentrated. Because the light is gathered, the straight line hits the groove 0420 and then rebounds linearly to the bottom surface of the light guide plate 0410, and then bounces back to the light guide plate. The top surface of 0410, and the bright and dark bands with dense spacing; therefore, the giant structure design concept can inherit the idea that the inverted V-shaped groove 0431 covers all the light-emitting surfaces of the light source 0100, so as to improve the utilization, but the specific micro In the structural design, an arcuate groove recessed inwardly can be designed to guide the light beam of the light source 0100. Of course, taking another embodiment as an example, considering the small thickness requirement of the overall thin direct type backlight module, it is also possible to directly form a receiving groove on the bottom surface of the light guide plate to accommodate the body of the light source. As mentioned above, if the pairing of the light source light type and the light guide plate is actually carried out, there is a need for the scatter beam, and the accommodating groove is preferably an arc shape that is recessed inward; on the contrary, if there is a demand for bundling, it is inverted V. More preferably, the above solution cannot be mixed. For example, the top surface of the receiving groove is designed to have a bundled or scattered geometry, and the centrally opened small groove that destroys the light type.

As described above, the present invention is not only the technical field of the processing technology of the light guide plate, but also from the existing light guide plate surface structure design means, the fine selection can be applied to the foregoing embodiments, and then the multiplicative effect is produced. As described in the following, in the embodiment, a surface microstructure is formed on the top surface of the light guide plate at the periphery of the groove, which can be used to finely adjust according to the change of the arrangement density or the change of the structure depth. The amount of light. This technical means, in the mass processing of the thin direct type described in the technical aspect When the backlight module is used, it is very practical; the surface micro-structures of different specifications can be used to adjust the light guide plates and their grooves produced by different batches to achieve product uniformity and improve process stability.

In other words, the machining tool that cuts the groove will be worn out due to the use, and the effect of the groove will be different. In the production line, the same group of tools is the same batch of raw materials, that is, raw. The light guide of the first hundred batches of the light guide plate may be different from the light pattern of the last one hundred batches; therefore, each hundred batches of processing can be progressively matched with the back-end process to process different patterns (patent) ) The uniform light effect is unified on the light guide plate. From this point of view, this is not achieved by injection molding technology. More specifically, a machining tool set for realizing the light guide plate and the thin direct type backlight module with the light-expanding function described above will be described, which includes a first tool and at least one second tool corresponding to the two-stage structure. The angle between the bottom of the groove and the bent portion is angled; therefore, as in the foregoing concept, in the specific process, the two infeed machining can be disassembled into two processes, and the sampling process is followed by the first knife. The processing effect of the grooved semi-finished product is not as expected, the angle and depth of the second knife can be adjusted, and the finished light effect of the groove can be corrected. Finally, the optical microstructure pattern is selected according to the demand, resulting in improved production efficiency and uniform quality. The scrap rate is reduced; this is not the result of the general injection molding or the technology of simply forming a groove on the surface of the light guide plate, and the technical means are proved to be extraordinary.

Finally, please refer to FIG. 25 and FIG. 26 together; FIG. 25 is a schematic structural view of a groove microstructure of an embodiment of the present invention, and FIG. 25 is a schematic structural view of a groove microstructure of another embodiment of the present invention. It is claimed that the application of the above pattern process can also be applied to the surface of the groove 0420, that is, a groove microstructure 0421 is formed on the surface of the groove 0420, and the groove microstructure 0421 can be a plurality of wavy ridges. Or surface scratches that help when When the effect of the shape of the groove 0420 changing the light pattern is too good, the doubt of the central dark spot is solved. Therefore, from this point of view, the groove 0420 is not as strong as the ability to divergize the light pattern toward the lateral direction. When it is too strong, the central dark spot appears instead, and the light amount adjustment is required by the groove microstructure 0421. It is apparent that the groove 0420 and its microstructure design have differences from those taught by conventional conventional design means. In addition, the implementation of the groove microstructure 0421, such as wavy ridges and surface scratches, is related to the tool and will be described later.

In addition, in view of the positive cross-section of the light guide plate, in order to achieve the above-mentioned technical objective of guiding the light type of the light source to the lateral direction in the light guide plate, the shape of the groove can be designed to be circular; it is worth noting that The position of the light guide plate is different, for example, at the center or near the edge, and the shape of the groove can also be designed as a circular ellipse or egg shape, so as to obtain uniform light distribution of the light guide plate.

In a further embodiment, a light guide plate with a light-expanding function is proposed in the embodiment, and a meso-layer interface is formed on the periphery of the groove to help increase the luminous flux. With uniformity. For example, the interlayer interface can be an air gap. Specifically, the light guide plate processing process can be as small as 0.1 mm, so the light guide plate with a thickness of 6 mm can be formed by laminating two or more sub-boards; therefore, an air gap is formed between the two sub-boards; The path between the groove directly below and the light source should not have an air gap, so it should be filled with transparent glue.

In the design of the machining tool set for actually applying the groove on the light guide plate, please refer to FIG. 27, which is a structural schematic diagram of the processing tool set of the thin direct type backlight module of the present invention, which is used for processing. As shown in FIG. 4, the recess has a thin direct type backlight module 0202 having a structure of two or more stages. The machining tool set 0500 includes a first tool 0510 and a second tool 0520. The first tool 0510 is located at the position of the light source 0100. The axial center feeds the light guide plate 0212 so that the two sidewalls of the bottom of the groove form an angle of 70-90 degrees; the second cutter 0520 is off-axis to the first cutter 0510, and feeds the light guide plate to form the first A bent portion 0241 and a second bent portion 0242.

In other embodiments, the second tool 0520 can be an annular cutter or can be designed to connect the first cutter 0510 to the body. Further, the feed depth of the second cutter 0520 can be designed to be 60-80% of the feed depth of the first cutter 0510. On the other hand, the first tool 0510 and the second tool 0520 may alternatively or entirely be designed as a rotary feed tool. In the process of the rotary feed, the groove microstructure 0421 can be processed by the way.

Please refer to FIG. 28 , which is a schematic structural view of a thin direct type backlight module processing tool set according to another embodiment of the present invention. As shown in the figure, the machining tool set 0501 includes a first tool 0511 and a second tool 0521. The first cutter 0511 is centered on the position of the light source 0100, and feeds the light guide plate 0212 so that the two sidewalls of the bottom of the groove form an angle of 70-90 degrees; the second cutter 0521 is coaxial with the first cutter 0511, with 140 The light guide plate 0212 is fed to -150 degrees to form the first bent portion 0241 and the second bent portion 0242.

Finally, the creator of the present invention further verified that if the structure taught by the embodiments is not adopted, the design of other possibilities, that is, the case of the failure of the experiment of the novel creator, for later reference, is shown in the column as shown in FIG. The shape cone is taken as an example, and the 29th figure is a schematic diagram of the structure of a new creator. The cylindrical tip shown in Figure 29 will yield the following technical shortcomings:

1. Section problem: It is impossible to receive the light of the light source between the wall of the vertical column and the section of the inclined wall, and a dark band will be produced, and the grade must be uneven.

2. The same angle bevel: the point source is not perfect, there must be a certain area, a simple V-shaped groove, the angle design is bound to meet certain specific light, and can not take care of other deviation angles of the incoming light.

3. The width of the light source is limited: from the point of view of the design of the light source, the bottom angle of a single V-shaped groove is locked, which causes the design of the light source to be quite limited.

4. Uncontrollable second-order optics: because the angle at which the light source diverges is progressively changed above a conditional value (for example, 36 degrees); therefore, the bottom angle of the locked V-shaped groove causes a large angle to cut into the groove. (for example, 63 degrees), its secondary optics cannot be fully estimated, that is, its landing point cannot be predicted.

Therefore, the creators of this new model are eager to bring forward the technical enthusiasm, and provide relevant failure experience for further reference. In conclusion, the embodiment disclosed by the present invention further contributes the following technical effects as compared with the above technical solution:

1. Design angle and structure diameter relationship

2. The relationship between the width of the light source, the diameter of the structure and the number of structural segments

3. Propose the optimal design angle and number of segments of the corresponding light source width

According to the calculation equation, the design method is proposed.

5. Further improve the design of uniformity and efficiency

Based on the actual implementation, the total reflection angle from the PMMA to the air of the light guide plate is 42.15 degrees. In order to make the forward light (0 degree) fully reflective, a two-stage V-shaped with a bottom angle of less than 84.3 degrees is designed. Conical structure, at this time, the groove designed by two or more sections can further reduce the thickness and structural depth of the overall light guide plate. Here are the explanations: Taking the length of the cross section of the light source as an example, in order to prevent the forward light from directly leaving the light exiting surface, the half width (cone radius) of the groove structure must be greater than 1 cm, so that a simple V-shaped groove considering a total reflection angle of 42.15 degrees is known. The thickness of the light guide plate under the structure must be greater than 1.10 cm, ie: X=tan47.85°=1.10cm°

In contrast, the structure of the two or more sections taught, as shown in Fig. 30, is a geometrical diagram of the two-stage groove, assuming that the total cross-sectional width of the groove is divided into two structures having a width of 0.5 cm, and the sides of the groove are The angle of the second section of the two bends is increased to 120 degrees to calculate, then:

Y1=0.55cm

Y2=0.28cm

Therefore, the overall structure height only needs Y=y1+y2=0.83cm, which obviously reduces the overall thickness by 25%.

It is worth noting that the overall structure of the groove is divided into several segments to approximate the smooth curve of the light pattern, which is determined by the smoothness of the light curve. According to the selected material PMMA, the bottom structure of the groove is less than 84.3 degrees except for the angle requirement. The other angle relationship design can refer to the following formula: Y=(x+42.15°)x2 where X is the segment to be segmented. For the relative light source angle, please refer to Figure 31, which is a segmented concave The slot design architecture diagram; taking the 27-degree segmentation point as an example, the second-stage structure is 138.3 degrees; taking the 15-degree segmentation point as an example, the second-stage structure is 114.3 degrees.

Further, based on the above teachings, the sidewall of the recess of the thin direct type backlight module or the light guide plate having the light-expanding function may further include a third bent portion; the system is located away from the light-emitting surface with respect to the second bent portion. The third bending portion forms a third inner angle in the light guide plate, and the third inner angle is 135-150 degrees. Thereby, the inscribed circle of the line segments between the bent portions can form an inscribed circle envelope, and the inscribed circle envelope is a smooth curve designed according to the light type, and further theoretical derivation is taken into consideration. The ideal state and the actual needs of practical industrial processing.

To be stated, the first collinear segment may be defined as a virtual straight line of the first bent portion and the second bent portion, and the second collinear segment may be defined as a virtual straight line between the second bent portion and the bottom portion; In the bent portion, the virtual straight line of the second bent portion and the third bent portion is the second collinear segment, the virtual straight line of the third bent portion and the bottom portion is the third collinear segment, and so on. The collinear segments can each draw an inscribed circle. The drawing method can use the same radius, the center of different positions, or adjust the radius and the center of the circle to draw an inscribed circle to cut more than two collinear segments; this is mathematically The definition is not discussed here. Finally, these inscribed circles are defined near the groove, and an envelope is defined. The line shape of the envelope matches the 50% light intensity envelope of the light source to guide the light in the light guide plate. Travel sideways.

From another perspective, the envelope can be a second-order or higher differential equation curve, which depends mainly on the light pattern of the 50% light intensity envelope of the light source; and the shape of the sidewall of the groove matches the second-order differential equation curve. After that, the average deviation is within 5%. This design method also has its application and benefit.

Finally, the multi-section design of the groove not only guides the light of the light source laterally, but also improves the lateral light intensity uniformity outside the center of the light source. The experiment is as follows: The simulation results of the third control group are as shown in Nos. 32 and 33. Figure 34 shows. Fig. 32 is a schematic view showing the structure of the third control group, Fig. 33 is a light intensity distribution diagram of the third control group, and Fig. 34 is a schematic diagram showing the uniformity distribution of the third control group. In Fig. 32, the structure of the third control group is a single-section V-shaped structure groove with a depth of 5 mm and a bottom angle of 84.3 degrees. From the result of Fig. 34, it is obvious that bright spots 0601 appear on both sides, which affects the overall light uniformity. .

The simulation results of the third experimental group are shown in Figures 35, 36, and 37. Fig. 35 is a schematic view showing the structure of the third experimental group, Fig. 36 is a light intensity distribution diagram of the third experimental group, and Fig. 37 is a schematic diagram showing the uniformity distribution of the third experimental group. In Fig. 35, the structure of the third experimental group is the two-stage V-shaped structural groove of the above teaching, the total depth is 5 mm, the depth of the first bent portion to the second bent portion is 3 mm, the bottom angle is 84.3 degrees, and the groove is two The second bending part of the side has a virtual angle of 120 degrees; from the result of the 37th figure, it is obvious that the two side bright points disappear, which proves that the edge bright ring is effectively eliminated, and the overall uniformity is increased.

Therefore, in the light guide plate of the foregoing embodiments, the brightness of the front side relative to the center of the LED light source does not exceed 15%, 20%, and 25% of the brightness of the periphery of the light source according to the distance. Please refer to FIG. 37 for a comprehensive understanding. It can be used as a uniform surface light source. Moreover, the machining tool set can also synchronously scrape fine lines or generate wavy surface processing lines when the grooves are dug.

The above description is only a preferred and feasible embodiment of the present invention, and thus does not limit the scope of the patent of the present invention, so the equivalent technical change of the present specification and the contents of the drawings is used. All are included in the scope of the present invention.

0100‧‧‧Light source

0212‧‧‧Light guide plate

0231‧‧‧ angle

0242‧‧‧Second bend

0202‧‧‧Thin type direct type backlight module

0222‧‧‧ Groove

0241‧‧‧First bend

Claims (66)

A thin direct type backlight module includes: a light guide plate; a light source on a bottom surface of the light guide plate, having a 50% light intensity envelope; and a groove on a top surface of the light guide plate, the groove The shape starts from the top surface of the light guide plate and is curved toward the bottom surface of the light guide plate to stop within the 50% light intensity envelope. The thin direct type backlight module of claim 1, wherein the shape of the groove is curved from the top surface of the light guide plate toward the bottom surface of the light guide plate and gradually becomes steep. The thin type direct type backlight module of claim 1, wherein the shape of the groove is curved from the top surface of the light guide plate toward the bottom surface of the light guide plate and gradually flattened. The thin direct type backlight module of claim 1, wherein the shape of the groove is a smooth curve according to a side cross section of the light guide plate. The thin direct type backlight module of claim 1, wherein the shape of the groove is a circular shape in a front view of the light guide plate. The thin direct type backlight module of claim 1, wherein the groove depth is 50-95% of the thickness of the light guide plate. The thin direct type backlight module of claim 1, wherein the surface opening area of the groove is 30-90 times the area of the light source body. The thin direct type backlight module of claim 1, further comprising a sandwich interface formed inside the light guide plate and disposed at a periphery of the groove. The thin direct type backlight module of claim 8, wherein the interlayer interface is an air gap. The thin type direct type backlight module of claim 1, further comprising a surface microstructure formed on a top surface of the light guide plate at a periphery of the groove, and finely adjusting the amount of light by a change in arrangement density. The thin direct type backlight module of claim 1, further comprising a surface microstructure formed on a top surface of the light guide plate at a periphery of the groove, and the amount of light is finely adjusted according to a structural depth change. The thin direct type backlight module of claim 1, further comprising a groove microstructure formed on a surface of the groove, the groove microstructure being a plurality of wavy ridges. The thin direct type backlight module of claim 1, further comprising a groove microstructure formed on a surface of the groove, the groove microstructure being a plurality of surface scratches. The thin type direct type backlight module of claim 1, further comprising an inverted V-shaped groove formed on a bottom surface of the light guide plate and facing the light source, wherein an opening diameter of the inverted V-shaped groove is a body length of the light source 1/3-1/10. The thin direct type backlight module of claim 1, further comprising an inverted V-shaped groove formed on the bottom surface of the light guide plate and facing the light source, wherein the inverted V-shaped groove has an opening diameter corresponding to the body of the light source length. The thin type direct type backlight module of claim 1, further comprising a receiving groove formed on a bottom surface of the light guide plate for receiving the body of the light source. A light guide plate with a light-expanding function is used for mounting at least one light source on the bottom surface, guiding the light source to emit light on the top surface, and when the light source is close to the bottom surface, the top surface has no significant light spot, including: a body, a plate And a groove formed on the top surface of the body, viewed along a side of the body, the groove is shaped to start from the top surface of the body and curved toward the bottom surface of the body. The light guide plate having the light-expanding function according to claim 17, further comprising an inverted V-shaped groove formed on the bottom surface of the light guide plate and facing the light source, wherein the diameter of the opening of the inverted V-shaped groove is the body of the light source 1/3-1/10 of the length. The light guide plate having the light-expanding function according to claim 17, further comprising an inverted V-shaped groove formed on the bottom surface of the light guide plate and facing the light source, the opening diameter of the inverted V-shaped groove is equivalent to the light source Body length. The light guide plate having the light-expanding function according to claim 17, further comprising a receiving groove formed on the bottom surface of the light guide plate for receiving the body of the light source. The light guide plate having the light-expanding function according to claim 17, wherein the shape of the groove is curved from the top surface of the light guide plate toward the bottom surface of the light guide plate and gradually becomes steep. The light guide plate having the light-expanding function according to claim 17, wherein the shape of the groove is curved from the top surface of the light guide plate toward the bottom surface of the light guide plate and gradually flattened. The light guide plate having the light-expanding function according to claim 17, wherein the shape of the groove is a smooth curve according to a side cross-section of the light guide plate. The light guide plate having the light-expanding function according to claim 17, wherein the shape of the groove is a circular shape viewed from a front cross section of the light guide plate. The light guide plate having the light-expanding function according to claim 17, wherein the groove depth is 50-95% of the thickness of the light guide plate. The light guide plate having the light-expanding function according to claim 17, wherein the surface opening area of the groove is 30-90 times the area of the light source body. The light guide plate having the light-expanding function according to claim 17, further comprising a sandwich interface formed inside the light guide plate and disposed at a periphery of the groove. The light guide plate having a light-expanding function according to claim 27, wherein the interlayer interface is an air gap. The light guide plate having the light-expanding function according to claim 17 further comprising a surface microstructure formed on the top surface of the light guide plate at a periphery of the groove, and the amount of light is finely adjusted by the change of the arrangement density. The light guide plate having the light-expanding function according to claim 17 further comprising a surface microstructure formed on the top surface of the light guide plate at a periphery of the groove, and the amount of light is finely adjusted by a change in the depth of the structure. The light guide plate having the light-expanding function according to claim 17, 29 or 30, further comprising a groove microstructure formed on the surface of the groove, the groove microstructure being a plurality of wavy ridges. The light guide plate having the light-expanding function according to claim 17, 29 or 30, further comprising a groove microstructure formed on the surface of the groove, the groove microstructure being a plurality of surface scratches. A thin direct type backlight module is configured to install at least one light source on the light incident surface, and guide the light source to emit light on the light exit surface, and when the light source is close to the light incident surface, the light exit surface has no significant light spot, including: a guide a light plate; and a groove formed on the light-emitting surface of the light guide plate, the groove is formed by a side cross-section, and is formed by two side walls, and the two side walls form an angle of 70-90 degrees at the bottom of the groove, and any of the side walls has a first bent portion is located near the light exiting surface, the first bent portion forms a first inner angle in the light guide plate, the first inner angle is 160-165 degrees; and at least one second bend The folded portion is located away from the light exiting surface with respect to the first bent portion, and the second bent portion forms a second internal angle in the light guide plate, and the second internal angle is 140-155 degrees. The thin-type direct-lit backlight module of claim 33, further comprising: a third bent portion located at a distance from the light-emitting surface relative to the second bent portion, wherein the third bent portion is in the light guide plate A third internal angle is formed, the third internal angle being 135--150 degrees. The thin type direct type backlight module of claim 33 or 34, further comprising an inverted V-shaped groove formed on the light incident surface of the light guide plate and facing the light source, wherein the inverted V-shaped groove has an opening diameter of the The body length of the light source is 1/3-1/10. The thin type direct type backlight module of claim 33 or 34, further comprising an inverted V-shaped groove formed on the light incident surface of the light guide plate and facing the light source, wherein the inverted V-shaped groove has an opening diameter equivalent to The length of the body of the light source. The thin type direct type backlight module of claim 33 or 34, further comprising a receiving groove formed on the light incident surface of the light guide plate for receiving the body of the light source. The thin direct type backlight module of claim 33, wherein the shape of the groove is a circular shape in a front view of the light guide plate. The thin direct type backlight module of claim 33, wherein the groove depth is 50-95% of the thickness of the light guide plate. The thin direct type backlight module of claim 33, wherein the second bent portion has a depth of 25-85% of the thickness of the light guide plate. The thin direct type backlight module of claim 33, wherein the surface opening area of the groove is 30-90 times the area of the light source body. The thin direct type backlight module of claim 33, wherein the second bent portion has a cross-sectional area of 16-48 times the area of the light source body. The thin type direct type backlight module of claim 33, further comprising a sandwich interface formed inside the light guide plate and disposed at a periphery of the groove. The thin direct type backlight module of claim 43, wherein the interlayer interface is a gas Gap. The thin type direct type backlight module of claim 33, further comprising a surface microstructure formed on a top surface of the light guide plate at a periphery of the groove, wherein the amount of light is finely adjusted by a change in arrangement density. The thin type direct type backlight module of claim 33 further comprising a surface microstructure formed on a top surface of the light guide plate at a periphery of the groove, and finely adjusting the amount of light by a structural depth change. The thin direct type backlight module of claim 33, 45 or 46, further comprising a groove microstructure formed on the surface of the groove, the groove microstructure being a plurality of wavy ridges. The thin direct type backlight module of claim 33, 45 or 46, further comprising a groove microstructure formed on a surface of the groove, the groove microstructure being a plurality of surface scratches. A thin direct type backlight module processing tool set for processing the thin direct type backlight module according to claim 33, comprising: a first tool, wherein the light source position is an axis, and the light guide plate is inserted into the light guide plate Processing, the two sidewalls of the bottom of the groove form an angle of 70-90 degrees; and a second cutter is off-axis to the first cutter, and the light guide plate is fed to form the first bend portion and The second bent portion. The thin direct type backlight module processing tool set according to claim 49, wherein the second tool is an annular cutter. The thin direct type backlight module processing tool set according to claim 49, wherein the second tool body is coupled to the first tool. The thin type direct type backlight module processing tool set according to claim 49, wherein the second The feed depth of the tool is 60-80% of the feed depth of the first tool. The thin direct type backlight module processing tool set according to claim 49, wherein the first tool is a rotary feed tool. The thin direct type backlight module processing tool set according to claim 49 or 53, wherein the second tool is a rotary feed tool. A thin direct type backlight module processing tool set for processing the thin direct type backlight module according to claim 33, comprising: a first tool, wherein the light source position is an axis, and the light guide plate is inserted into the light guide plate Processing, the two sides of the bottom of the groove form an angle of 70-90 degrees; and a second cutter coaxially with the first cutter, feeding the light guide plate at 140-150 degrees to form the first a bent portion and the second bent portion. The thin direct type backlight module processing tool set according to claim 55, wherein the second tool body is coupled to the first tool. The thin direct type backlight module processing tool set according to claim 55, wherein the second tool has a feeding depth of 60-80% of a feeding depth of the first tool. The thin direct type backlight module processing tool set according to claim 55, wherein the first tool is a rotary feed tool. The thin direct type backlight module processing tool set according to claim 55 or 58, wherein the second tool is a rotary feed tool. A thin direct type backlight module is configured to install at least one light source on the light incident surface, and guide the light source to emit light on the light exit surface, and when the light source is close to the light incident surface, the light exit surface has no significant light spot, including: a guide a light plate; a groove formed on a light-emitting surface of the light guide plate, the groove being viewed from a side cross section The two side walls are formed, and the two side walls form an angle of 70-90 degrees at the bottom of the groove, and the shape of the groove is a circular shape of the light guide plate; the groove depth is the thickness of the light guide plate 50-95%, the surface opening area of the groove is 30-90 times the area of the light source body; and any side wall has: a first bending portion located near the light emitting surface, the first bending Forming a first inner angle in the light guide plate, the first inner angle is 160-165 degrees; and at least one second bending portion is located away from the light exit surface relative to the first bent portion, the first The second bending portion forms a second inner angle in the light guide plate, the second inner angle is 140-155 degrees, and the second bending portion has a depth of 25-85% of the thickness of the light guide plate, the second The cross-sectional area of the bent portion is 16-48 times the area of the light source body; and an inverted V-shaped groove is formed on the light incident surface of the light guide plate and faces the light source, and the opening diameter of the inverted V-shaped groove is equivalent The length of the body of the light source. The thin type direct type backlight module of claim 60, further comprising a sandwich interface formed inside the light guide plate and disposed at a periphery of the groove. The thin direct type backlight module of claim 61, wherein the interlayer interface is an air gap. The thin type direct type backlight module of claim 60, further comprising a surface microstructure formed on a top surface of the light guide plate at a periphery of the groove, wherein the amount of light is finely adjusted by a change in arrangement density. The thin type direct type backlight module of claim 60, further comprising a surface microstructure formed on a top surface of the light guide plate at a periphery of the groove, and finely adjusting the amount of light by a structural depth change. The thin direct type backlight module of claim 60, 63 or 64, further comprising a groove microstructure formed on the surface of the groove, the groove microstructure being a plurality of waves Embossed. The thin direct type backlight module of claim 60, 63 or 64, further comprising a groove microstructure formed on a surface of the groove, the groove microstructure being a plurality of surface scratches.