CN108646337B - Side light-entering type light guide plate and backlight module - Google Patents

Side light-entering type light guide plate and backlight module Download PDF

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CN108646337B
CN108646337B CN201810644208.5A CN201810644208A CN108646337B CN 108646337 B CN108646337 B CN 108646337B CN 201810644208 A CN201810644208 A CN 201810644208A CN 108646337 B CN108646337 B CN 108646337B
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light
guide plate
light guide
arc
shaped grooves
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CN108646337A (en
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王鹏飞
林宜芳
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Shanxi Yuhao New Optical Material Co ltd
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Shanxi Yuhao New Optical Material Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Abstract

The invention relates to a side light-in type light guide plate, which belongs to the technical field of light guide plates and comprises a light-in surface, a mesh surface, a light-out surface, a light-reflecting surface and two side surfaces, wherein light emitted by an L ED light source is coupled into the side light-in type light guide plate from the light-in surface, the light-reflecting surface is arranged opposite to the light-in surface, the mesh surface is arranged opposite to the light-out surface, the two side surfaces are arranged opposite to each other, a plurality of basic V-shaped grooves or a plurality of arc-shaped grooves are arranged on the light-in surface, and the basic V-shaped grooves or the arc-shaped grooves penetrate from the light-out surface to the mesh surface.

Description

Side light-entering type light guide plate and backlight module
Technical Field
The invention relates to the technical field of light guide plates, in particular to a side light-entering light guide plate and a backlight module.
Background
The main optical components of a backlight module (B L U, Back L ight Unit) of a planar light source (flat panel lamp or liquid Crystal Display (L CD, &lttttransition = L "&gttl &/t &gttiquid Crystal Display) are constructed as L ED light source, a light guide plate (L GP, &lttttransition = L" &tttl &/t &tttgtt g sight guide plate), a reflective sheet, a diffusive sheet or a prism sheet L ED light source is a type of point light source, generally requiring application of a plurality of L EDs arranged side by side as a straight line, L number is determined according to different product specification requirements, light distribution spacing is uniformly distributed according to light guide plate light entrance end face length.
The light incident surface of the current side-incident light type light guide plate is a planar structure, and in this case, when two L EDs of an L ED light source used in cooperation with the light incident surface are far apart, the phenomenon of light shadows is serious.
Based on this, the prior art is certainly subject to improvement.
Disclosure of Invention
In order to solve the technical problem, the invention provides a side light-entering light guide plate, which has the following specific technical scheme:
the invention provides a side light-entering type light guide plate which comprises a light-entering surface, a mesh point surface, a light-exiting surface, a light-reflecting surface and two side surfaces, wherein light emitted by an L ED light source is coupled into the side light-entering type light guide plate from the light-entering surface, the light-reflecting surface is arranged opposite to the light-entering surface, the mesh point surface is arranged opposite to the light-exiting surface, the two side surfaces are arranged opposite to each other, a plurality of basic V-shaped grooves or a plurality of arc-shaped grooves are arranged on the light-entering surface, and the basic V-shaped grooves or the arc-shaped grooves penetrate from the light-exiting surface to the mesh point surface.
Optionally, be provided with a plurality of reinforcing V type recesses on the basis V type recess, reinforcing V type recess is followed go out the plain noodles and run through to the mesh face, the angle of basis V type recess is the obtuse angle, the angle of reinforcing V type recess is acute angle or right angle.
Optionally, the angle of the basic V-groove is 120 ± 10 °, and the angle of the reinforcing V-groove is 60 ± 10 °.
Optionally, the angle of the basic V-groove is 120 °, and the angle of the reinforcing V-groove is 90 °.
Optionally, the angle of the base V-groove is 135 ° and the angle of the reinforcing V-groove is 60 ° or 90 °.
Optionally, the arc-shaped grooves comprise equal-depth arc-shaped grooves and unequal-depth arc-shaped grooves.
Optionally, the thickness of the side light-entering light guide plate is 1.5mm, the curvature variation range of the unequal-depth arc-shaped grooves is 0.56-1.15, and the depth variation range is 0.17-0.43 mm; the thickness of the side light-entering type light guide plate is 2mm, the curvature variation range of the unequal-depth arc-shaped grooves is 0.42-0.86, and the depth variation range is 0.22-0.58 mm; the thickness of the side light-entering type light guide plate is 2.5mm, the curvature variation range of the unequal-depth arc-shaped grooves is 0.33-0.69, and the depth variation range is 0.28-0.72 mm; the thickness of the side light-entering type light guide plate is 3mm, the curvature variation range of the unequal-depth arc-shaped grooves is 0.28-0.57, and the depth variation range is 0.33-0.87 mm.
Optionally, a plurality of dots are arranged on the dot plane, and the dot density gradually increases from one end close to the light incident surface to one end far away from the light incident surface.
Optionally, the material of the side-entry light guide plate is PMMA, COP, PC, MS, PS or PET.
The embodiment of the invention also provides a backlight module which comprises the side light-entering light guide plate.
By means of the scheme, the plurality of basic V-shaped grooves or the plurality of arc-shaped grooves are formed in the light incident surface, so that the distribution angle of the light coupled into the side-entry light guide plate can be increased, namely, the opening angle of the light coupled into the side-entry light guide plate can be increased, the proportion of available light can be increased, and the lamp shadow phenomenon can be weakened.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is another schematic structure of the present invention.
Fig. 3 is a schematic view of another structure of the present invention.
Fig. 4 is a schematic diagram of the light intensity distribution after the light enters the side-entry light guide plate and the light intensity distribution in the air.
Fig. 5 is a schematic view of the interface state of light coupled into the light guide plate when the light incident surface of the light guide plate is a plane.
Fig. 6 is a schematic view of the interface state of light coupled into the light guide plate when the light incident surface of the light guide plate is a curved surface.
FIG. 7 is a schematic representation of the luminous intensity distribution of an L ED light source.
Fig. 8 is a schematic diagram of the light intensity distribution after the light enters the light guide plate from the light entrance side.
Fig. 9 is a schematic view of a reinforcing V-groove of 60 ° disposed on a base V-groove of 120 °.
Fig. 10 is a comparison diagram of light intensity distribution after light enters the light guide plate after the angle of the basic V-shaped groove is 60 ° and 120 ° and the enhanced V-shaped groove of 60 ° is arranged on the basic V-shaped groove of 120 °.
Fig. 11 is a schematic view of a reinforcing V-groove of 90 ° disposed on a base V-groove of 120 °.
Fig. 12 is a comparison diagram of light intensity distribution after light enters the light guide plate after the angle of the basic V-shaped groove is 90 ° and 120 ° and the enhanced V-shaped groove of 90 ° is arranged on the basic V-shaped groove of 120 °.
Fig. 13 is a schematic view of a reinforcing V-groove of 60 ° disposed over a base V-groove of 135 °.
FIG. 14 is a comparison of light intensity distributions of light entering the light guide plate after the basic V-shaped grooves have an angle of 60 DEG and 135 DEG and the enhanced V-shaped grooves of 60 DEG are formed in the basic V-shaped grooves of 135 deg.
Fig. 15 is a schematic view of a reinforcing V-groove of 90 ° disposed over a base V-groove of 135 °.
Fig. 16 is a comparison diagram of light intensity distribution after light enters the light guide plate after the angle of the basic V-shaped groove is 90 ° and 135 ° and the enhanced V-shaped groove of 60 ° is arranged on the basic V-shaped groove of 135 °.
Fig. 17 is a schematic view showing the relationship between the apex angle, depth and thickness of the light guide plate of the uneven-depth arc-shaped grooves.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
Referring to fig. 1 to 3, the side light-incident light guide plate provided in the embodiment of the present invention includes a light incident surface 1, a dot surface 2, a light exit surface 3, a light reflection surface 4, and two side surfaces 5 and 6, wherein light emitted from an L ED light source is coupled into the side light-incident light guide plate from the light incident surface 1, the light reflection surface 4 is disposed opposite to the light incident surface 1, the dot surface 2 is disposed opposite to the light exit surface 3, the two side surfaces 5 and 6 are disposed opposite to each other, the light incident surface 1 is provided with a plurality of basic V-shaped grooves 7 or a plurality of arc-shaped grooves, and the basic V-shaped grooves 1 or the arc-shaped grooves penetrate from the.
The material of the side light-entering light guide plate may be PMMA (polymethyl methacrylate), COP (cyclic olefin polymer), PC (polycarbonate), MS (methyl methacrylate-styrene copolymer), PS (polystyrene), or PET (polyethylene terephthalate).
Further, the arc-shaped groove may be an equal-depth arc-shaped groove 8, as shown in fig. 2; the arcuate grooves may also be arcuate grooves 9 of unequal depth, as shown in fig. 3. The equal depth means that the distances between the light rays on the same vertical line and the arc-shaped grooves are equal, and the unequal depth means that the distances between the light rays on the same vertical line and the arc-shaped grooves are unequal.
Specifically, L ED light source emits light which is coupled into the side-entry light guide plate from the light-incident surface 1 after being conducted by air, in the process, the light enters the optically dense medium from the optically thinner medium, and in combination with the above-mentioned side-entry light guide plate material, the refractive index of PMMA is 1.491, the refractive index of COP is 1.535, the refractive index of PC is 1.586, the refractive index of MS is 1.533, the refractive index of PS is 1.59, and the refractive index of PET is 1.655, since the refractive indices of these materials are all greater than that of air, according to the geometrical optics principle and Snell's law (Snell's L aw), the light intensity distribution after the light enters the side-entry light guide plate must be smaller than the distribution angle in air, as shown in fig. 4, the left graph in fig. 4 is the light intensity distribution in air, and the right graph in fig. 4 is the light intensity distribution after the light enters the light guide plate.
L ED light source is coupled into the side light-in type light guide plate via air, when the light-in surface of the side light-in type light guide plate is plane, the interface state of the light coupled into the side light-in type light guide plate is as shown in figure 5, L ED light source emits incident light, the refracted light is refracted through the light-in surface, because the refraction index of the side light-in type light guide plate is larger than that of air, following the refraction law, the angle theta L between the refracted light and the normal is smaller than the angle theta A between the incident light and the normal, when the light-in surface of the side light-in type light guide plate is made into curved surface structure, the interface state of the light coupled into the side light-in type light guide plate is as shown in figure 6, the geometrical principle is the same plane structure, therefore, the angle theta L 'between the refracted light and the normal is smaller than the angle theta A' between the plane and the curved surface light-in surface.
In combination with the above, in the embodiment of the invention, the light incident surface 1 is provided with the plurality of basic V-shaped grooves 7 or the plurality of arc-shaped grooves to increase the distribution angle of the light coupled into the side-entrance light guide plate, that is, to increase the opening angle of the light coupled into the side-entrance light guide plate.
As shown in Table 1, it is the light intensity distribution of L ED light source and the light intensity distribution after the light enters the side light-in type light guide plate with the light-in surface 1 including a plurality of basic V-shaped grooves measured by the optical experiment, as shown in FIG. 7 and FIG. 8, FIG. 7 is the light intensity distribution diagram of L ED light source, FIG. 8 is the light intensity distribution diagram after the light enters the side light-in type light guide plate, FIG. 8 shows that the light intensity distribution after the light enters the side light-in type light guide plate covers the angle range of-55-65 when the light-in surface 1 of the side light-in type light guide plate is a plane (curve 1 in FIG. 8), the light intensity distribution after the light enters the side light-in type light guide plate obviously increases when the basic V-shaped grooves are disposed on the light-in surface 1 of the side light-in type light guide plate, and the light intensity distribution after the light enters the side light guide plate obviously increases when the basic V-shaped grooves are disposed on the light-in surface 1 of the side light guide plate (curve 4 in FIG. 8).
TABLE 1
Figure BDA0001703134070000061
The principle of the arc-shaped grooves is the same as that of the basic V-shaped grooves 7, and after the plurality of arc-shaped grooves are arranged on the light incident surface 1 of the side light incident type light guide plate, the angle range covered by the light intensity distribution after the light enters the side light incident type light guide plate is obviously enlarged.
In summary, in the embodiment of the present invention, the plurality of basic V-shaped grooves 7 or the plurality of arc-shaped grooves are disposed on the light incident surface 1 of the side light incident type light guide plate, so that the light incident angle of the side light incident type light guide plate can be opened, the ratio of available light can be increased, and the light shadow phenomenon can be reduced.
Further, according to the light intensity distribution of the side light-entering type light guide plate with the plurality of basic V-shaped grooves 7 on the light-entering surface 1 shown in fig. 8, it can be known that the angles of the basic V-shaped grooves 7 suitable for light transmission and dispersion are 120 ° and 135 °, in this case, the light intensity at the viewing angle of 0 ° is the largest, the peak value of the light intensity is close to half power (the light intensity after entering the light guide plate is 0.5) at the viewing angle of 20 to 40 °, and the light guide plate has both transmission and light-emitting application effects, and the transmission effect of the planar structure is the best, but the light intensity distribution angle is limited within ± 60 °. In order to further increase the light intensity distribution range after the light enters the light guide plate from the light entrance side, in another embodiment of the present invention, a plurality of enhanced V-shaped grooves are disposed on the basic V-shaped groove 7, the enhanced V-shaped grooves penetrate from the light exit surface 3 to the dot surface 2, the angle of the basic V-shaped groove 7 is an obtuse angle, and the angle of the enhanced V-shaped groove is an acute angle or a right angle.
Specifically, after the basic V-shaped groove 7 is etched on the light incident surface 2, an enhanced V-shaped groove is further etched on the basic V-shaped groove 7. Because the reinforced V-shaped groove that can be etched on the basic V-shaped groove 7 is limited when the basic V-shaped groove 7 is an acute angle, the angle of the basic V-shaped groove 7 is set to be an obtuse angle, and the angle of the reinforced V-shaped groove is set to be an acute angle or a right angle in the embodiment of the present invention. The angle of the basic V-shaped groove 7 or the angle of the reinforced V-shaped groove refers to an angle formed by the basic V-shaped groove 7 or the reinforced V-shaped groove on the same horizontal plane.
The light intensity distribution angle range of the light entering side light-entering type light guide plate can be further enlarged by the structure that the plurality of basic V-shaped grooves 7 are only arranged on the light entering surface 2 relatively after the plurality of enhanced V-shaped grooves are arranged on the basic V-shaped grooves 7.
In another embodiment, the angle of the base V-groove 7 is 120 + -10 deg., and the angle of the reinforcing V-groove is 60 + -10 deg.. As shown in fig. 9, which is a schematic view of a 60 ° reinforcing V-groove provided on a 120 ° basic V-groove, fig. 9 is merely exemplified by providing a plurality of 60 ° reinforcing V-grooves on one 120 ° basic V-groove. As shown in fig. 10, it is a comparison diagram of the light intensity distribution after the light enters the light guide plate after the angle of the basic V-shaped groove 7 is 60 °, 120 ° and the enhanced V-shaped groove of 60 ° is disposed on the basic V-shaped groove of 120 °. As can be seen from fig. 10, the basic V-shaped groove 7 of 120 ° is matched with the enhanced V-shaped groove of 60 °, so that the distribution angle of the half light intensity (the light intensity is 0.5 after the light enters the light guide plate) is maximized, the maximum light intensity is 0 °, and the peak value of 30-60 ° is moderate and continuously decreases to the position of the half light intensity, and the light distribution is relatively uniform.
Experiments show that when the angle of the basic V-shaped groove 7 is 120 +/-10 degrees and the angle of the enhanced V-shaped groove is 60 +/-10 degrees, the light intensity and the distribution angle of the light entering the side light-entering type light guide plate can be maximized.
In another embodiment, the angle of the basic V-groove 7 is 120 ° and the angle of the reinforcing V-groove is 90 °. As shown in fig. 11, which is a schematic view of providing a 90 ° reinforcing V-groove on a 120 ° basic V-groove, fig. 11 is merely exemplified by providing a plurality of 90 ° reinforcing V-grooves on one 120 ° basic V-groove 7. As shown in fig. 12, it is a comparison diagram of the light intensity distribution after the light enters the light guide plate after the angle of the basic V-shaped groove 7 is 90 ° and 120 ° and the enhanced V-shaped groove of 90 ° is disposed on the basic V-shaped groove of 120 °. As can be seen from fig. 12, the basic V-shaped groove of 120 ° is matched with the enhanced V-shaped groove of 90 ° to maximize the distribution angle of the half-intensity, the maximum intensity continuously decreases to the half-intensity position at the peak values of 30 ° and 30-60 °, respectively, and the light distribution is relatively uniform.
In another embodiment, the angle of the basic V-groove 7 is 135 ° and the angle of the reinforcing V-groove is 60 ° or 90 °.
As shown in fig. 13, which is a schematic view of a 60 ° reinforced V-groove provided on a 135 ° basic V-groove, fig. 13 is merely exemplified by providing a plurality of 60 ° reinforced V-grooves on one 135 ° basic V-groove 7. As shown in fig. 14, it is a comparison diagram of light intensity distribution after the light enters the light guide plate after the angle of the basic V-shaped groove 7 is 60 °, 135 ° and the enhanced V-shaped groove of 60 ° is disposed on the basic V-shaped groove of 135 °. As can be seen from fig. 14, the 135 ° basic V-shaped groove matches with the 60 ° enhanced V-shaped groove, so that the half light intensity distribution angle is the largest, the maximum light intensity is 0 °, the peak value of 0-60 ° is moderate and continuously decreases to the half light intensity position, and the light distribution is relatively uniform.
As shown in fig. 15, which is a schematic view of a 90 ° reinforcing V-groove provided on a 135 ° base V-groove, fig. 15 is merely exemplified by providing a plurality of 90 ° reinforcing V-grooves on one 135 ° base V-groove 7. As shown in fig. 16, it is a comparison diagram of the light intensity distribution after the light enters the light guide plate after the angle of the basic V-shaped groove 7 is 90 °, 135 ° and the enhanced V-shaped groove of 60 ° is disposed on the basic V-shaped groove of 135 °. As can be seen from fig. 16, the 135 ° basic V-shaped groove matches with the 90 ° enhanced V-shaped groove, so that the half light intensity distribution angle is the largest, the maximum light intensity is at 20 °, and the peak values of 20-60 ° continuously decrease to the half light intensity position, respectively, and the light distribution is relatively uniform.
Further, when the arc-shaped groove on the light incident surface 1 is the arc-shaped groove 9 with unequal depth, when the depth d of the arc-shaped groove 9 with unequal depth changes, the curvature K also changes correspondingly. In order to obtain a better light intensity distribution angle range and make the light guide plate more applicable, the thickness T of the side light-entering type light guide plate is set to be 1.5-3mm, and correspondingly, the curvature change range of the arc-shaped groove is 0.28-1.15. The thickness T of the side light-entering light guide plate is the distance between the light-emitting surface 3 and the dot surface 2. Tests show that when the thickness T of the side light-entering type light guide plate is 1.5-3mm, and correspondingly the change range of the curvature K of the unequal-depth arc-shaped groove 9 is 0.28-1.15, the opening angle of the side light-entering type light guide plate can be increased obviously, and the light shadow phenomenon can be weakened obviously.
Specifically, the length of the light emitting surface of the L ED light source corresponds to the length of the light incident surface of the side light incident type light guide plate, the width of the L ED light source corresponds to the thickness T of the side light incident type light guide plate and is less than or equal to the thickness T of the side light incident type light guide plate, based on the thickness T of the light guide plate being 1.5mm, 2mm, 2.5mm, and 3mm, the relationship between the vertex angle θ and the depth d of the unequal-depth arc-shaped groove 9 of the light incident surface and the thickness T of the light guide plate is shown in fig. 17, and the curvature K is shown.
Specifically, as shown in fig. 17, when the vertex angle θ is 165 °, the depth d of the arc-shaped groove is too small, so that the side-entry light guide plate is close to L ED light source and the overheating problem is easily caused, and therefore the angle range of the vertex angle θ in the embodiment of the present invention is selected to be 120 ° or 155 °.
When the thickness T of the side-entry light guide plate is 1.5mm, the depth d is 0.43mm when the vertex angle θ is 120 °, and the curvature K is 1.15, which is an optimum angle. When the apex angle θ is 155 °, the depth d is 0.17mm, and the curvature K is 0.56, and the optimum depth can be obtained. Since the light matching is good but the light intensity is decreased when the light source is too far away from the light source, it can be seen from table 2 that when the thickness T of the side-entry light guide plate is 1.5mm, the optimum curvature K is in the range of 0.56-1.15.
When the thickness T of the side-entry light guide plate is 2mm, the depth d is 0.58mm when the vertex angle θ is 120 °, and the curvature K is 0.86, which is the optimum angle. When the apex angle theta is 155 deg., the depth d is 0.22mm and the curvature K is 0.42, the best depth matching can be obtained. Since the light matching is good but the light intensity is decreased when the light source is too far away from the light source, it can be seen from table 2 that when the thickness T of the side-entry light guide plate is 2mm, the optimum curvature K ranges from 0.42 to 0.86.
When the thickness T of the side-entry light guide plate is 2.5mm, the depth d is 0.72mm when the vertex angle θ is 120 °, and the curvature K is 0.69, which is an optimum angle. When the apex angle θ is 155 °, the depth d is 0.28mm, and the curvature is 0.33, and the optimum depth matching can be obtained. Since the light matching is good but the light intensity is decreased when the light source is too far away from the light source, it can be seen from table 2 that when the thickness T of the side-entry light guide plate is 2.5mm, the optimum curvature K is in the range of 0.33 to 0.69.
When the thickness T of the side-entry light guide plate is 3mm, the depth d is 0.87mm when the vertex angle θ is 120 °, and the curvature K is 0.57, which is the optimum angle. When the apex angle θ is 155 °, the depth d is 0.33mm, and the curvature K is 0.28, and the optimum depth matching can be obtained. Since the light pattern is well matched but the light intensity is decreased when the light source is too far away from the light source, it can be seen from table 2 that the optimum curvature K ranges from 0.28 to 0.57 when the side-entry light guide plate has a thickness T of 3 mm.
TABLE 2
Figure BDA0001703134070000101
Figure BDA0001703134070000111
Optionally, a plurality of dots are disposed on the dot plane 2, and the dot density gradually increases from one end close to the light incident plane 1 to one end far away from the light incident plane 1. That is, the dots are densely arranged on the dot plane 2 from the end close to the light incident plane 1 to the end far from the light incident plane 1. The dot density refers to the number of dots distributed per unit area. Because the light intensity can weaken gradually from the light incident surface 1 to the light reflection-incident surface 4 after the light enters the side light-incident type light guide plate, the arrangement can ensure that the light scattered from all directions is relatively uniform.
The embodiment of the invention also provides a backlight module, which comprises the side light-entering light guide plate provided in the content. For the rest of the components of the backlight module, reference may be made to the contents in the related art, and for the specific composition and structure of the side-entry light guide plate, reference may be made to the contents provided in the above embodiments, which are not described herein again.
The backlight module provided by the embodiment of the invention can increase the light intensity of the backlight module by arranging the backlight module comprising the side light-entering type light guide plate, thereby weakening the shadow phenomenon.
All the optional technical schemes can be combined at will, and the structure after one-to-one combination is not explained in detail in the invention.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.

Claims (4)

1. L ED light source emitted by the light source is coupled into the side light-entering type light guide plate from the light-entering surface, the light-entering surface is opposite to the light-entering surface, the mesh point surface is opposite to the light-exiting surface, the two side surfaces are opposite to each other, a plurality of arc-shaped grooves are arranged on the light-entering surface, and the arc-shaped grooves penetrate through the light-exiting surface and extend downwards to the mesh point surface;
the arc-shaped grooves are arc-shaped grooves with different depths; the unequal depths mean that the distances between the light rays on the same vertical line and the arc-shaped groove are unequal;
the thickness of the side light-entering type light guide plate is 1.5mm, the curvature variation range of the unequal-depth arc-shaped grooves is 0.56-1.15, and the depth variation range is 0.17-0.43 mm;
or the thickness of the side light-entering type light guide plate is 2mm, the curvature variation range of the unequal-depth arc-shaped groove is 0.42-0.86, and the depth variation range is 0.22-0.58 mm;
or the thickness of the side light-entering type light guide plate is 2.5mm, the curvature variation range of the unequal-depth arc-shaped grooves is 0.33-0.69, and the depth variation range is 0.28-0.72 mm;
or the thickness of the side light-entering type light guide plate is 3mm, the curvature variation range of the unequal-depth arc-shaped grooves is 0.28-0.57, and the depth variation range is 0.33-0.87 mm.
2. The light guide plate of claim 1, wherein the dot surface has a plurality of dots, and the density of the dots increases from an end near the light incident surface to an end far from the light incident surface.
3. The light guide plate of claim 1, wherein the material of the light guide plate is PMMA, COP, PC, MS, PS or PET.
4. A backlight module, comprising the side-entry light guide plate of any one of claims 1 to 3.
CN201810644208.5A 2018-06-21 2018-06-21 Side light-entering type light guide plate and backlight module Active CN108646337B (en)

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CN101988686A (en) * 2009-08-03 2011-03-23 友达光电股份有限公司 Light guide plate
CN102393545A (en) * 2011-12-09 2012-03-28 深圳市华星光电技术有限公司 Light guide plate, and backlight unit and liquid crystal display apparatus possessing the same
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CN204666858U (en) * 2015-05-08 2015-09-23 东莞市颖锋光电材料有限公司 A kind of light guide plate improving bright dipping briliancy
CN105629370A (en) * 2016-01-05 2016-06-01 京东方光科技有限公司 Light guide plate, backlight module and display device
CN107884870A (en) * 2017-12-27 2018-04-06 翰博高新材料(合肥)股份有限公司 A kind of light conducting plate structure for solving the problems, such as lamp shadow and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN1797096A (en) * 2004-12-29 2006-07-05 鸿富锦精密工业（深圳）有限公司 Plate for guiding light
CN201035177Y (en) * 2007-01-19 2008-03-12 台湾奈普光电科技股份有限公司 Improved structure of light conducting plate
CN101988686A (en) * 2009-08-03 2011-03-23 友达光电股份有限公司 Light guide plate
CN201615441U (en) * 2009-12-31 2010-10-27 深圳市山本光电有限公司 Light guide plate
US8870434B2 (en) * 2011-09-12 2014-10-28 Skc Haas Display Films Co., Ltd. Asymmetric serrated edge light guide film having circular base segments
CN102393545A (en) * 2011-12-09 2012-03-28 深圳市华星光电技术有限公司 Light guide plate, and backlight unit and liquid crystal display apparatus possessing the same
CN204666858U (en) * 2015-05-08 2015-09-23 东莞市颖锋光电材料有限公司 A kind of light guide plate improving bright dipping briliancy
CN105629370A (en) * 2016-01-05 2016-06-01 京东方光科技有限公司 Light guide plate, backlight module and display device
CN107884870A (en) * 2017-12-27 2018-04-06 翰博高新材料(合肥)股份有限公司 A kind of light conducting plate structure for solving the problems, such as lamp shadow and preparation method thereof

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