CN115220145A - Backlight module and light guide plate - Google Patents
Backlight module and light guide plate Download PDFInfo
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- CN115220145A CN115220145A CN202211006010.7A CN202211006010A CN115220145A CN 115220145 A CN115220145 A CN 115220145A CN 202211006010 A CN202211006010 A CN 202211006010A CN 115220145 A CN115220145 A CN 115220145A
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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
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/003—Lens or lenticular sheet or layer
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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
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
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Abstract
The invention provides a backlight module, which comprises a light guide plate and a light source. The light guide plate comprises a light incident surface, a light emergent surface, a bottom surface, a plurality of first micro-lens structures, a plurality of second micro-lens structures, a plurality of light-diffusing microstructures and a plurality of grooves. The light emergent surface comprises a first area and a second area which is arranged between the first area and the light incident surface and is smaller than the first area. The first micro-lens structures are arranged in the first area of the light-emitting surface and are arranged along the first direction and extend towards the second direction perpendicular to the first direction and the light-in surface. The second micro-lens structures are arranged in the second area of the light-emitting surface and are arranged along the first direction, and each second micro-lens structure is provided with a plurality of bending parts. The light-diffusing microstructures are arranged on the light incident surface and are arranged in parallel along a first direction, and the light source is arranged on one side of the light incident surface of the light guide plate. The plurality of grooves are arranged on the bottom surface. A light guide plate for a backlight module is also provided. The backlight module and the light guide plate provided by the invention have the effects of improving the light-emitting uniformity and avoiding generating light interference grains.
Description
Technical Field
The present invention relates to a light source module, and more particularly, to a backlight module and a light guide plate.
Background
The known backlight module includes a light guide plate and a plurality of light emitting diodes, the light guide plate has a light incident surface and a light emitting surface adjacent to the light incident surface, the light emitting diodes are disposed beside the light incident surface of the light guide plate, and after light emitted from the light emitting diodes enters the light guide plate through the light incident surface, the light guide plate guides the light to the light emitting surface of the light guide plate to emit the light. Because the light-emitting diodes are arranged beside the light-in surface at a certain interval, the light emitted by the light-emitting diodes can cause the light-out surface of the light guide plate near the light-in surface to form alternately bright and dark regions, i.e. a phenomenon of uneven brightness (hot spot). Therefore, it is known to dispose a light-diffusing microstructure (e.g., a bump with an arc-shaped side surface) on the light incident surface to improve the brightness unevenness. Moreover, in the design of the conventional light guide plate, a cylindrical lens (lens) structure extending from the light incident surface to a direction away from the light incident surface can be disposed on the light emergent surface to increase the brightness and the shielding performance of the backlight module. However, if the light guide plate has the light-diffusing microstructure and the lenticular lens structure, the light-diffusing microstructure and the lenticular lens structure interfere with each other to generate light interference patterns with a relatively obvious bright-dark contrast on the light-emitting surface, which reduces the uniformity of the emitted light and seriously affects the visual quality.
The "background" section is only provided to aid in understanding the present disclosure, and thus the disclosure in the "background" section may include some known techniques that do not constitute a part of the knowledge of those skilled in the art. Furthermore, the disclosure in the "background" does not represent a material or problem to be solved by one or more embodiments of the present invention, nor is it a representation that has been known or appreciated by those skilled in the art prior to the filing of the present application.
Disclosure of Invention
The invention provides a backlight module and a light guide plate, which can provide a backlight source with high luminance uniformity and avoid generating light interference lines under the condition that microstructures are simultaneously arranged on a light emergent surface and a light incident surface.
Other objects and advantages of the present invention will be further understood from the technical features disclosed in the embodiments of the present invention.
In order to achieve one or a part of or all of the above or other objects, an embodiment of the invention provides a backlight module including a light guide plate and a light source. The light guide plate comprises a light incident surface, a light emergent surface, a bottom surface, a plurality of first micro-lens structures, a plurality of second micro-lens structures, a plurality of light expansion microstructures and a plurality of grooves. The light incident surface is connected between the light emergent surface and the bottom surface, the light emergent surface comprises a first area and a second area, and the second area is arranged between the first area and the light incident surface and is smaller than the first area. The first micro-lens structures are arranged in the first area of the light-emitting surface and are arranged along a first direction, each first micro-lens structure extends towards a second direction, the first direction is perpendicular to the second direction, and the second direction is perpendicular to the light-in surface. The thickness of the first micro-lens structure is gradually increased from one end close to the light incident surface to the other end opposite to the light incident surface. The second micro-lens structures are arranged in the second area of the light-emitting surface and are arranged along the first direction, and each second micro-lens structure is provided with a plurality of bending parts. The two adjacent bending parts in the second micro structure protrude towards opposite directions, and respective vertexes of the two adjacent bending parts are respectively positioned at two sides of a connecting line of two ends of the second micro lens structure in the second direction. The light-diffusing microstructures are arranged on the light incident surface and are arranged in parallel along a first direction, the plurality of grooves are arranged on the bottom surface and are perpendicular to the plurality of first micro-lens structures, and the light source is arranged on one side of the light incident surface of the light guide plate.
In order to achieve one or a part of or all of the above objectives or other objectives, an embodiment of the invention provides a light guide plate, which includes a light incident surface, a light emitting surface, a bottom surface, a plurality of first microlens structures, a plurality of second microlens structures, a plurality of light spreading microstructures, and a plurality of grooves. The light incident surface is connected between the light emergent surface and the bottom surface, the light emergent surface comprises a first area and a second area, and the second area is arranged between the first area and the light incident surface and is smaller than the first area. The first micro-lens structures are arranged in the first area of the light-emitting surface and are arranged along a first direction, each first micro-lens structure extends towards a second direction, the first direction is perpendicular to the second direction, and the second direction is perpendicular to the light-in surface. The thickness of the first micro-lens structure is gradually increased from one end close to the light incident surface to the other end opposite to the light incident surface. The second micro-lens structures are arranged in the second area of the light-emitting surface and arranged along the first direction, and each second micro-lens structure is provided with a plurality of bending parts. The two adjacent bending parts in the second micro structure protrude towards opposite directions, and respective vertexes of the two adjacent bending parts are respectively positioned at two sides of a connecting line of two ends of the second micro lens structure in the second direction. The distance between two endpoints of each second micro-lens structure in the second direction along the second direction is between 1mm and 6mm, and the respective vertexes of two adjacent bending parts are respectively located at two sides of the connecting line of the two endpoints. The light-diffusing microstructures are arranged on the light incident surface and are arranged in parallel along a first direction. The plurality of grooves are arranged on the bottom surface and are vertical to the plurality of first micro-lens structures.
Embodiments of the present invention have at least one of the following advantages. In the backlight module of the embodiment of the invention, the area of the light-emitting surface of the light guide plate close to the light-incident side is provided with the plurality of second micro-lens structures in the bent shapes, so that the light collecting effect of the first micro-lens structures close to the light-incident side can be weakened, the interference phenomenon generated by the interaction influence of the first micro-lens structures of the light-emitting surface and the light-expanding micro-structures of the light-incident surface on light rays is eliminated, and the generation of light interference grains with obvious light and shade contrast is avoided. Moreover, because the second micro-lens structure of the bending type has a plurality of bending parts protruding towards different directions, the effect of scattering the advancing route of the incident light can be provided, the interference phenomenon is further weakened, and the light emitting uniformity of the area of the light guide plate close to the light inlet side can be improved, and the second micro-lens structure of the bending type can be designed to have the same number of the bending parts at two sides so as to balance the deflection light quantity at two sides and make the light emitting more uniform. In addition, a blank area without microstructures can be arranged in the distribution area of the second micro-lens structure in a matched bending mode, and the first micro-lens structure and the second micro-lens structure can have size distribution with gradual change or regional difference according to needs, so that the light collecting intensity or the light homogenizing effect is adjusted locally, and the luminance distribution uniformity of the light emitting surface is further improved. Furthermore, a plurality of grooves can be formed on the bottom surface of the light guide plate by matching the first micro lens structure, the second micro lens structure and the light-diffusing microstructure, so that the phenomenon of uneven brightness on the light inlet side of the light guide plate is eliminated.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic perspective view of a backlight module according to an embodiment of the invention.
Fig. 2 and 3 are schematic diagrams illustrating a dimension design of the second microlens structure in a folded configuration, wherein fig. 3 is a partial enlarged view of fig. 2.
FIGS. 4A-4E are schematic diagrams illustrating optical simulations of light-guiding transition regions of a light guide plate according to various embodiments of the present invention.
Fig. 5A and 5B are schematic views of a first microlens structure and a second microlens structure according to another embodiment of the invention.
FIG. 6 is a schematic diagram of a second microlens structure of a meander pattern according to another embodiment of the invention.
Fig. 7 is a schematic diagram of a first microlens structure and a second microlens structure according to another embodiment of the invention.
Fig. 8 is a schematic diagram of a first microlens structure and a second microlens structure according to another embodiment of the invention.
Fig. 9 is a schematic view of a backlight module according to another embodiment of the invention.
List of reference numerals
100. 100a backlight module
110 light guide plate
110a incident light surface
110b light-emitting surface
110c bottom surface
112. 112A, 112B, 122 first microlens structure
114. 124 second microlens Structure
114a, 114a (M), 114a (N) a bent portion
114b linear section
114c arc curved segment
114d point of inflection
116 light-diffusing microstructure
118: trench
120 light source
120a light emitting element
C, connecting wire
D1 first direction
D2 the second direction
D3 third Direction
d is the distance between
H. h is distance
MP, the vertex of the bending part
NL normal to the light incident surface
P is the first area
Q is the second region
R is a blank region
Alpha is the included angle.
Detailed Description
The foregoing and other technical and other features and advantages of the invention will be apparent from the following detailed description of preferred embodiments, read in conjunction with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
Fig. 1 is a schematic perspective view of a backlight module according to an embodiment of the invention. Referring to fig. 1, a backlight module 100 of the present embodiment includes a light guide plate 110 and a light source 120. The light guide plate 110 has an incident surface 110a, an exit surface 110b and a bottom surface 110c, the incident surface 110a is connected between the exit surface 110b and the bottom surface 110c, and the light source 120 is disposed at one side of the incident surface 110a and is adapted to provide a light beam toward the incident surface 110a. That is, the backlight module 100 of the present embodiment is a side-in type backlight module. In the present embodiment, the light source 120 may include a plurality of light emitting elements 120a arranged along a direction, such as, but not limited to, light emitting diodes.
In the embodiment, the light emitting surface 110b includes a first region P and a second region Q, and the second region Q is disposed between the first region P and the light incident surface 110a and is smaller than the first region P. When the light guide plate is applied to a display device, the light guide plate can be divided into a transition area shielded by a frame and a visible area corresponding to a display area (active area) of the display device, in this embodiment, the first area P of the light guide plate 110 can overlap the visible area and the second area Q can overlap the transition area. The plurality of first microlens structures 112 are disposed in the first region P of the light-emitting surface 110b, and each of the first microlens structures 112 is arranged along the first direction D1 and extends toward the second direction D2 to be distributed in the first region P, so that the first microlens structures 112 can provide a shielding effect and improve a light-collecting effect of the light-emitting brightness of the light-emitting surface 110 b. In the present embodiment, the first direction D1 is perpendicular to the second direction D2, and the second direction D2 is perpendicular to the light incident surface 110a. The plurality of second microlens structures 114 are disposed in the second region Q of the light emitting surface 110b, the second microlens structures 114 are arranged along the first direction D1, and each second microlens structure 114 has a plurality of bending portions 114a. In this embodiment, all the bending portions 114a are only distributed on the light emitting surface 110b and are not extended or disposed on the surface of other light guide plates, each bending portion 114a protrudes along a direction parallel to the light emitting surface 110b, and two adjacent bending portions 114a have different protruding directions. For example, the bending portion 114a (M) shown in fig. 1 protrudes toward the right side of the second region Q, and the adjacent bending portion 114a (N) protrudes toward the left side of the second region Q, that is, the bending portion 114a (M) and the bending portion 114a (N) have opposite protruding directions. The light-diffusing microstructures 116 may be disposed on the light-incident surface 110a and arranged in parallel along the first direction D1, and each light-diffusing microstructure 116 may extend along the third direction D3, so that the light-incident surface 110a has a saw-tooth shape or a wavy shape. The light diffusing microstructures 116 may be used to enlarge the light incident angle and reduce the dark area of the light incident side of the light guide plate 110, and the light diffusing microstructures 116 may include a plurality of semicircular columns, but is not limited thereto, and in other embodiments, the light diffusing microstructures 116 may be different structures such as a groove structure, a dot structure, or a frosted surface.
In the embodiment of the invention, the arrangement of the first microlens structure 112 and the second microlens structure 114 is not limited. For example, the first microlens structures 112 may be arranged parallel to each other and have the same pitch as shown in fig. 1; in another embodiment, each first microlens structure 112 can be connected to an adjacent first microlens structure 112. Furthermore, in an embodiment, a plurality of second microlens structures 114 can be arranged parallel to one another, a corresponding relationship between a first microlens structure 112 and a second microlens structure 114 can be formed between the first microlens structure 112 and the second microlens structure 114, and the first microlens structure 112 and the second microlens structure 114 can be connected to one another. In other embodiments, the first microlens structures 112 and the second microlens structures 114 do not have a one-to-one number arrangement relationship, and there may be a gap therebetween.
An example of the dimension design of the second microlens structure 114 in the folded configuration is described below with reference to fig. 2 and 3, wherein fig. 3 is a partial enlarged view S of fig. 2. Referring to fig. 2, in an embodiment, a distance H between two end points of the second microlens structure 114 in the second direction D2 perpendicular to the light incident surface 110a along the second direction D2 may be between 1mm and 6mm, and furthermore, two adjacent bending portions 114a of the microlens structure 114 may protrude in different directions, so in the embodiment, for example, respective vertexes of the two adjacent bending portions 114a (M) and 114a (N) may be respectively located at two sides of a connection line C between two ends of the second microlens structure 114 in the second direction D2. Furthermore, as shown in fig. 3, a distance h between the vertex MP of the two bending portions protruding from the second microlens structure 114 in the same direction and the normal NL of the light incident surface may be between 25 micrometers and 1000 micrometers, and a minimum distance d between two adjacent second microlens structures 114 may be between 25 micrometers and 500 micrometers. In addition, each of the second microlens structures 114 may be formed by a plurality of line-shaped segments 114b connected to each other, and an acute angle α between each of the line-shaped segments 114b and the normal NL to the light incident surface 110a may be between 15 degrees and 75 degrees.
By means of the design of the above embodiment, since the area of the light-emitting surface 110b of the light guide plate 110 near the light-incident side is provided with the plurality of second microlens structures 114 in a bent shape, the light-collecting effect of the first microlens structures 112 near the light-incident side can be weakened, thereby eliminating the interference phenomenon generated by the interaction between the first microlens structures 112 of the light-emitting surface 110b and the light-diffusing microstructures 116 of the light-incident surface 110a, and avoiding the generation of light interference patterns with obvious light and dark contrast. Moreover, because the second microlens structure 114 of the folded type has a plurality of bending portions 114a protruding in different directions, for example, two adjacent bending portions 114a (M), 114a (N) can protrude in opposite directions, so that respective vertexes of the two adjacent bending portions 114a (M), 114a (N) are respectively located at two sides of a connecting line C between two ends of the second microlens structure 114 in the second direction D2, thereby providing an effect of scattering an incident light traveling route, further weakening the interference phenomenon and improving the light-emitting uniformity of the light guide plate 110 near the light-incident side region.
Fig. 4A to 4E are schematic diagrams illustrating optical simulation of light incident transition regions of a light guide plate according to different embodiments of the present invention, and fig. 4A to 4E only use hatching to plot bright regions of the light guide plate in the optical simulation results, so that the bright region distribution areas of the respective drawings can be used to compare the light interference pattern elimination effects of different designs, wherein the smaller the bright region distribution area is, the less obvious the light interference pattern is, i.e., the better the light interference pattern elimination effect is. Fig. 4A is a conventional design of a microlens structure without a bending pattern, and fig. 4B-4E are optical simulation diagrams of the light entrance transition region when the angle α between the linear segment 114B and the normal NL of the light entrance surface is 15 degrees, 30 degrees, 45 degrees, and 60 degrees respectively under the conditions that the distance h =200 μm and the distance d =120 μm. As is clear from the bright area distributions of the respective drawings in fig. 4A-4E, the different embodiments of the second microlens structure with a folded configuration of the present invention can provide the effect of reducing the optical interference fringes compared to the conventional design, and as can be seen from the comparison of fig. 4B-4E, the effect of reducing the optical interference fringes is very good when the angle α is 45 degrees (fig. 4D) and 60 degrees (fig. 4E). Therefore, in the embodiment of the present invention, a preferred range of the acute angle α between the linear section 114b and the normal NL to the light incident surface may be about 45 degrees to 60 degrees.
In an embodiment of the invention, the shapes of the first microlens structure 112 without a bending portion and the second microlens structure 114 with a bending portion 114a are not limited, and may be, for example, the arc-shaped lens structure shown in fig. 1, or may be, for example, the V-shaped lens structure shown in fig. 5A and 5B to provide better light control performance. That is, the cross-sectional profiles of the first microlens structure 112 and the second microlens structure 114 may be triangular, fan-shaped, arcuate, trapezoidal, etc. without limitation.
FIG. 6 is a schematic diagram of a second microlens structure of a meander pattern according to another embodiment of the invention. As shown in fig. 6, in the present embodiment, the second microlens structure 114 can also be formed by connecting a plurality of arc-shaped curved sections 114c, and each two adjacent arc-shaped bending sections can respectively protrude toward two opposite directions to form an inverse curved point 114d. Furthermore, in the embodiment of the invention, the number of the bending portions of each second microlens structure 114 protruding toward one direction may be equal to the number of the bending portions protruding toward the opposite direction, thereby balancing the amount of deflected light on both sides of the second microlens structure 114 and making the light emitting more uniform.
In an embodiment of the invention, the first microlens structure and the second microlens structure are not limited to the bump structure shown in fig. 1, for example, as shown in fig. 7, the second microlens structure 124 in the bent configuration and the first microlens structure 122 in the unbent configuration may be groove structures recessed from the light exit surface 110b, and the cross-sectional profile of the groove structures may be, but is not limited to, triangular, fan-shaped, bow-shaped, trapezoidal, and the like.
Fig. 8 is a schematic view of a microlens structure according to another embodiment of the invention. In this embodiment, the thickness of the first microlens structure 112A without the bending portion may gradually increase from one end close to the light incident surface 110a to the other end opposite to the light incident surface, and the light intensity near one side of the light incident surface is relatively high, so that the first microlens structure 112A with gradually increasing thickness can provide a gradually changing light collecting effect, and the overall uniformity of the light guide plate 110 in light emitting can be improved corresponding to the gradually changing light intensity from the light incident side, and the gradually changing light collecting effect generated by the first microlens structure 112A with gradually changing size is also helpful for weakening the aforementioned interference phenomenon. Furthermore, the first microlens structure 112A with gradually changing thickness and the first microlens structure 112B without gradually changing thickness can be disposed on the light-emitting surface 110B corresponding to the light source distribution position, and the second microlens structure 114 in the bent form can also have gradually changing or regionally different size distribution as required, so that the light collection intensity or the light uniformization effect can be locally adjusted, and the luminance uniformity of the light-emitting surface is further improved.
Fig. 9 is a schematic view of a backlight module according to another embodiment of the invention. In the backlight module 100a of the present embodiment, a blank region R without microstructures may be further disposed between the second region Q of the light emitting surface 110b and the light incident surface 110a, and the blank region R may be smaller than the second region Q, for example, and the provision of the blank region R is also helpful to weaken the aforementioned interference phenomenon and reduce the required number of the second microlens structures 114 in the bending mode. Furthermore, in the present embodiment, the bottom surface 110c of the light guide plate 110 may be distributed with a plurality of grooves 118, and the grooves 118 are arranged along the second direction D2 and extend in the first direction D1, and may be substantially perpendicular to the first micro-prism structures 112. When the light emitted from the light source 120 encounters the light-diffusing microstructures 116 of the light-incident surface 110a, the light entering the light guide plate 110 can be uniformly diffused in advance, and then the light is reflected or scattered by the grooves 118 of the bottom surface 110c to be diffused into a planar shape and then enter the light-emitting surface 110b, so that the grooves 118 can reduce the phenomenon of uneven brightness (hot spot) on the light-incident side of the light guide plate 110 to further improve the uniformity of luminance distribution.
In summary, in the backlight module according to the embodiment of the invention, since the area of the light-emitting surface of the light guide plate near the light-incident side is provided with the plurality of second microlens structures in the bent shape, the light-collecting effect of the first microlens structures near the light-incident side can be weakened, thereby eliminating the interference phenomenon caused by the interaction between the first microlens structures on the light-emitting surface and the light-diffusing microstructures on the light-incident surface, and avoiding the generation of light interference patterns with obvious light-dark contrast. Moreover, because the second micro-lens structure of the bending type has a plurality of bending parts protruding towards different directions, the effect of scattering the advancing route of the incident light can be provided, the interference phenomenon is further weakened, the light-emitting uniformity of the area of the light guide plate close to the light-in side can be improved, and the second micro-lens structure of the bending type can be designed to be the same in the number of the bending parts at two sides so as to balance the deflection light quantity at two sides and enable the light-emitting to be more uniform. In addition, a blank area without microstructures can be arranged in the distribution area of the second micro-lens structure in a matched bending mode, and the first micro-lens structure and the second micro-lens structure can have size distribution with gradual change or regional difference according to needs, so that the light collecting intensity or the light homogenizing effect is adjusted locally, and the luminance distribution uniformity of the light emitting surface is further improved. Furthermore, a plurality of grooves can be formed on the bottom surface of the light guide plate by matching the first micro-lens structure, the second micro-lens structure and the light-diffusing micro-structure, so that the phenomenon of uneven brightness of the light incident side of the light guide plate is eliminated.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A backlight module comprises a light guide plate and a light source
The light guide plate comprises a light incident surface, a light emergent surface, a bottom surface, a plurality of first micro-lens structures, a plurality of second micro-lens structures, a plurality of light-expanding microstructures and a plurality of grooves, wherein the light incident surface, the light emergent surface, the bottom surface, the plurality of first micro-lens structures, the plurality of second micro-lens structures, the plurality of light-expanding microstructures and the plurality of grooves are arranged in the grooves
The light incident surface is connected between the light emergent surface and the bottom surface, the light emergent surface comprises a first area and a second area, and the second area is arranged between the first area and the light incident surface and is smaller than the first area;
the plurality of first micro-lens structures are arranged in the first area of the light emitting surface, the plurality of first micro-lens structures are arranged along a first direction, each first micro-lens structure extends towards a second direction, the first direction is perpendicular to the second direction, the second direction is perpendicular to the light incident surface, and the thickness of each first micro-lens structure is gradually increased from one end close to the light incident surface to the other end opposite to the light incident surface;
the plurality of second micro-lens structures are arranged in the second area of the light emitting surface, the plurality of second micro-lens structures are arranged along the first direction, each second micro-lens structure is provided with a plurality of bending parts, two adjacent bending parts in each second micro-structure protrude towards opposite directions, the respective vertexes of the two adjacent bending parts are respectively positioned at two sides of a connecting line of two ends of each second micro-lens structure in the second direction, and the number of the bending parts protruding towards the two opposite directions of each second micro-lens structure is the same; and
the light diffusion microstructures are arranged on the light incident surface and are arranged in parallel along the first direction;
the plurality of grooves are arranged on the bottom surface and are vertical to the plurality of first micro-lens structures; and
the light source is arranged on one side of the light incident surface of the light guide plate.
2. The backlight module of claim 1, wherein a distance between two endpoints of each second microlens structure in the second direction along the second direction is between 1mm and 6 mm.
3. The backlight module of claim 1, wherein each of the second microlens structures is formed by a plurality of linear segments connected to each other, and an acute angle between each of the linear segments and a normal of the light incident surface is between 45 degrees and 60 degrees.
4. The backlight module of claim 1, wherein each of the second microlens structures is an arc-shaped structure having at least one inflection point.
5. The backlight module of claim 1, wherein the second microlens structures are parallel to each other, and a minimum distance between two adjacent second microlens structures is between 25 micrometers and 500 micrometers.
6. The backlight module of claim 1, wherein the first and second microlens structures have a triangular, fan-shaped, arcuate, or trapezoidal cross-sectional profile.
7. The backlight module of claim 1, wherein the first micro-lens structures and the second micro-lens structures are bump structures protruding from a light-emitting surface or groove structures recessed from the light-emitting surface.
8. The backlight module of claim 1, wherein the light-emitting surface further comprises a blank region without a micro-lens structure, and the blank region is located between the light-incident surface and the second region.
9. The backlight module of claim 1, wherein the first microlens structures and the second microlens structures have a one-to-one number configuration.
10. The light guide plate comprises a light incident surface, a light emergent surface, a bottom surface, a plurality of first micro-lens structures, a plurality of second micro-lens structures, a plurality of light expansion micro-structures and a plurality of grooves, wherein the light incident surface, the light emergent surface, the bottom surface, the plurality of first micro-lens structures, the plurality of second micro-lens structures, the plurality of light expansion micro-structures and the plurality of grooves are arranged on the light guide plate
The light incident surface is connected between the light emergent surface and the bottom surface, the light emergent surface comprises a first area and a second area, and the second area is arranged between the first area and the light incident surface and is smaller than the first area;
the plurality of first micro-lens structures are arranged in the first area of the light emitting surface, the plurality of first micro-lens structures are arranged along a first direction, each first micro-lens structure extends towards a second direction, the first direction is perpendicular to the second direction, the second direction is perpendicular to the light incident surface, and the thickness of each first micro-lens structure is gradually increased from one end close to the light incident surface to the other end opposite to the light incident surface;
the plurality of second micro-lens structures are arranged in the second area of the light emitting surface, the plurality of second micro-lens structures are arranged along the first direction, each second micro-lens structure is provided with a plurality of bending parts, the distance between two endpoints of each second micro-lens structure in the second direction along the second direction is between 1mm and 6mm, two adjacent bending parts in each second micro-structure protrude towards opposite directions, the respective vertexes of the two adjacent bending parts are respectively positioned on two sides of the connecting line of the two endpoints, and the number of the bending parts protruding towards two opposite directions of each second micro-lens structure is the same;
the light diffusion microstructures are arranged on the light incident surface and are arranged in parallel along the first direction; and
the plurality of grooves are arranged on the bottom surface and are perpendicular to the plurality of first micro-lens structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211006010.7A CN115220145A (en) | 2022-08-22 | 2022-08-22 | Backlight module and light guide plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211006010.7A CN115220145A (en) | 2022-08-22 | 2022-08-22 | Backlight module and light guide plate |
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| KR20180078938A (en) * | 2016-12-30 | 2018-07-10 | 엘지디스플레이 주식회사 | Backlight unit and liquid crystal display device including same |
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| CN101630037A (en) * | 2008-07-18 | 2010-01-20 | 鸿富锦精密工业（深圳）有限公司 | Backlight module and light guide plate thereof |
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