CN211263844U - Light guide plate, backlight module and display device - Google Patents

Abstract

The utility model provides a light guide plate, backlight unit and display device. Specifically, the light guide plate comprises a light emitting surface, a bottom surface opposite to the light emitting surface, and a light incident surface and a non-light incident surface which are connected with the light emitting surface and the bottom surface; the light incident surface is arranged corresponding to the light source, and a plurality of micro units used for absorbing light rays are arranged on the non-light incident surface at intervals. The micro unit used for absorbing light is arranged on the non-light-incident surface of the light guide plate, the micro unit absorbs light on the side edge of the light guide plate and light reflected by the side wall of the back plate, and light at the edge of the rubber frame is reduced, so that light leakage of the side edge is effectively improved, formation of a bright line on the side edge is avoided, and picture quality is improved.

Description

Light guide plate, backlight module and display device

Technical Field

The utility model relates to a show technical field, especially relate to a light guide plate, backlight unit and display device.

Background

The liquid crystal module is widely used as a display device in electronic products such as mobile phones, notebook computers, tablet computers, digital cameras, vehicle-mounted displays, liquid crystal televisions and the like. The liquid crystal module mainly comprises a liquid crystal panel and a backlight module, wherein the backlight module mainly has the function of providing uniform and high-brightness luminous bodies for the liquid crystal panel. Along with the development of the technology and the improvement of the appearance demand of consumers, the traditional backlight module with the front frame and the rear cover cannot meet the demand of high-end consumers, and research personnel of many display manufacturers break through the narrow frame and ultrathin display and the like continuously, however, the narrow frame has the problem of side light leakage, and the picture quality of a visual area is influenced.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present invention is to provide a light guide plate, a backlight module and a display device to solve the technical problem of side light leakage in narrow frames.

In view of the above, the present invention provides a light guide plate, which includes a light emitting surface, a bottom surface opposite to the light emitting surface, and a light incident surface and a non-light incident surface connecting the light emitting surface and the bottom surface; the light incident surface is arranged corresponding to the light source, and a plurality of micro units used for absorbing light rays are arranged on the non-light incident surface at intervals.

Further, the micro unit comprises a groove and a light absorption structure arranged on the groove.

Further, the grooves are sequentially arranged at intervals along the direction from the light emitting surface to the bottom surface.

Further, the light absorption structure is a coating coated on the surface of the groove or a filling part for filling the groove.

Further, the light absorbing structure is black in color.

Furthermore, the depth of the groove is 50-100 microns, and the size of the groove along the direction from the light emitting surface to the bottom surface is 100-300 microns.

Further, the cross-sectional shape of the groove is a parallelogram, a trapezoid or a triangle.

Further, the groove and the light guide plate are integrally formed in an injection molding mode.

On the other hand, the utility model also provides a backlight module, including aforementioned arbitrary light guide plate.

In another aspect, the present invention further provides a display device, which includes the backlight module.

From the above, can see out, the utility model provides a light guide plate, backlight unit and display device sets up the little unit that is used for absorbing light through the non-income plain noodles at the light guide plate, little unit absorbs the light of light guide plate side and the light of backplate lateral wall reflection, reduces to jet out the light at gluey frame edge to effectively improve the side light leak, avoid the formation of side bright line, improve the picture quality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a backlight module in the prior art;

fig. 2 is a schematic structural view of a light guide plate according to an embodiment of the present invention;

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

fig. 4 is a schematic structural view of a non-light-incident surface of a light guide plate according to an embodiment of the present invention;

fig. 5A is a schematic structural view of a light guide plate according to an embodiment of the present invention, in which a cross section of a groove is a parallelogram;

fig. 5B is a schematic structural view illustrating a groove of a light guide plate according to an embodiment of the present invention, the groove having a trapezoidal cross section;

fig. 5C is a schematic structural view illustrating a groove of a light guide plate according to an embodiment of the present invention, the groove having a triangular cross section;

fig. 6 is a schematic structural diagram of a backlight module according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.

It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should have the ordinary meaning as understood by those having ordinary skill in the art to which the present disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

As shown in fig. 1, the inventor of the present invention noticed that, in the existing narrow frame and frameless module, light is collected at the side of the light guide plate 1 ', and meanwhile, the light at the side of the light guide plate 1 ' can be reflected to the back plate 2 ', and because the glue frame 3 ' is narrow, the light reflected by the side of the light guide plate 1 ' and the side of the back plate 2 ' can not be blocked, and the light is emitted from the edge of the glue frame 3 ', which causes side light leakage and affects the quality of the picture in the visible area.

In view of this, the embodiments of the present invention provide a light guide plate. As shown in fig. 2 to 3, the light guide plate 1 includes a light emitting surface 13 for emitting light, a bottom surface 14 opposite to the light emitting surface 13, and a light incident surface (not shown) and a non-light incident surface 12 connecting the light emitting surface 13 and the bottom surface 14, wherein the light incident surface is disposed corresponding to the light source. It should be understood that the side corresponding to the non-light-incident surface is free of light sources. For example, the light source is disposed at the lower side, the light incident surface is located at the lower side of the light guide plate 1, and the left side, the right side, and the upper side of the light guide plate 1 are all non-light incident surfaces 12; for another example, the light sources are disposed on the left and right sides, the light incident surface is located on the left side surface and the right side surface of the light guide plate 1, and both the upper side surface and the lower side surface of the light guide plate 1 are non-light incident surfaces 12.

Further, a plurality of micro units 11 for absorbing light rays are arranged on the non-light incident surface 12 at intervals. The micro-units 11 can absorb light rays emitted to the non-light-incident surface 12, such as light rays emitted from the side edge of the light guide plate 1 and light rays reflected by the side wall of the back plate, so that light rays emitted from the edge of the rubber frame are reduced, light leakage from the side edge is effectively improved, occurrence of side bright lines is avoided, and picture quality is improved. In addition, since the micro-cells 11 have a small size, a dark band does not occur at the side of the light guide plate at a normal viewing angle, and thus the original function of the light guide plate 1 is not affected.

As an alternative embodiment, the microcell 11 includes a protrusion and a light absorbing layer disposed on the surface of the protrusion, and the light absorbing layer is made of a light absorbing material. Based on the structure, light emitted to the protrusions is absorbed by the absorption layer, light between the back plate and the side edge of the light guide plate is effectively reduced, light emitted out of the edge of the rubber frame is obviously reduced, and the technical effect of improving side light leakage is achieved. It should be understood that the distance between the end of the protrusion and the non-light incident surface is less than or equal to 200 μm, depending on the requirement of the narrow frame.

As an alternative embodiment, as shown in fig. 2 and 3, the microcell 11 includes a groove 111 and a light absorbing structure 112 disposed on the groove 111. Here, when the light guide plate is installed in the backlight module, the light absorbing structure 112 absorbs light rays emitted from the side of the light guide plate or reflected by the back plate and the reflective film when the light rays are emitted to the groove 111. By utilizing the groove 111 and the light absorption structure 112 thereon, light at the edge of the rubber frame can be conveniently reduced, light gathering is eliminated, and the technical effects of improving side light leakage and avoiding side bright lines are achieved. In addition, the groove 111 is disposed inside the non-light incident surface 12, and the light absorbing structure 112 is disposed on the groove 111, so that the size of the light guide plate 1 is not increased, and the light guide plate is more suitable for manufacturing a display device with a narrow frame than a convex structure.

Further, the grooves 111 are sequentially arranged at intervals along the direction from the light emitting surface 13 to the bottom surface 14, referring to fig. 4. Such an arrangement allows the microcells 11 to form a structure like a micro louver, and light of a large angle is absorbed by the microcells 11 (refer to a dotted arrow in fig. 2) based on the principle that light of different angles of the louver has different transmittances, thereby reducing light leakage at the side. Meanwhile, based on the structure of the micro louver, light rays with small angles cannot be absorbed (refer to a solid arrow in fig. 2), and under a normal viewing angle, a dark band cannot appear on the side surface of the light guide plate 1, so that the original function of the light guide plate 1 can be ensured.

It should be noted that the groove 111 may be flexibly disposed on the non-light incident surface 12 according to specific implementation requirements. For example, the non-light incident surface 12 is provided with a row of the grooves 111, as shown in fig. 4, the arrangement is simple, and the processing is convenient. Of course, the non-light incident surface 12 may also have a plurality of rows of the grooves 111, that is, the grooves 111 are arranged in an array.

As a specific example of the light absorption structure in the above embodiment, referring to fig. 2, the light absorption structure 112 is a filling portion filling the groove 111. The filling part is simple and convenient to prepare, does not need a special process, and is convenient for industrial application.

As a specific example of the light absorbing structure in the above embodiment, referring to fig. 3, the light absorbing structure 112 is a coating layer coated on the surface of the groove 111. The coating requires less material and is more favorable for reducing the cost.

Further, the light absorbing structure is black in color. The black color can absorb light with various wavelengths in a visible light range, and the light absorption structure can be guaranteed to have a good light absorption effect. Alternatively, the material of the light absorbing structure may be selected from the group consisting of: black UV (Ultraviolet light, ultra Rays, abbreviated UV) curable material or black thermally curable material. The material can be cured by ultraviolet irradiation or heating, and is simple and convenient. Wherein, the black UV curing material can be acrylic resin or urethane resin doped with black pigment; the black thermosetting material may be an epoxy-based resin doped with a black pigment. The black pigment may be carbon black. Optionally, the material of the light absorbing structure is black UV glue.

As an alternative embodiment, as shown in FIG. 5A, the depth of the groove is 50-100 μm, which is indicated by letter L. The size of the groove along the direction from the light emitting surface to the bottom surface is 100-300 mu m, and the groove is represented by a letter h in the figure. The depth and the size of the groove can ensure the absorption of light rays with large angles and can effectively avoid the formation of dark bands on the non-light-incident surface of the light guide plate.

Further, the sectional shape of the groove 111 may be flexibly set. For example, referring to fig. 5A, the cross-sectional shape of the groove 111 may be a parallelogram, wherein the parallelogram includes, but is not limited to, a rectangle. For another example, referring to fig. 5B, the cross-sectional shape of the groove 111 may be trapezoidal. For another example, the cross-sectional shape of the groove 111 may be a triangle (see fig. 5C). Different cross section shapes are set, so that different requirements of customers generated based on different test visual angles and different acceptance levels can be met.

Further, the groove 111 and the light guide plate 1 are integrally injection-molded. Through integrative injection moulding, need not to carry out special processing to light guide plate 1 and can obtain recess 111, convenient simple and low cost.

Based on same utility model conceive, this embodiment is novel still provides a backlight unit, and this backlight unit includes: the light guide plate according to any of the above embodiments. Obviously, the backlight module of the present embodiment employs the light guide plate of the foregoing embodiment, and accordingly has the technical effects of eliminating light gathering of the light guide plate, solving the problem of bright edges caused by side light leakage, and improving picture quality.

As a specific embodiment, referring to fig. 6, the backlight module further includes an optical template 4, a reflective film 5, a back plate 2, and a glue frame 3. Specifically, an optical diaphragm 4 is arranged on the light emitting surface of the light guide plate 1, and a reflective film 5 and a back plate 2 are sequentially arranged on the bottom surface of the light guide plate 1; the back plate 2 is provided with a side wall which coats the side surfaces of the light guide plate 1 and the optical diaphragm 4; and the side wall and the optical diaphragm 4 are provided with a rubber frame 3.

In the prior art, as shown in fig. 1, since the rubber frame 3 is narrow, the light collected on the side surface of the light guide plate 1 and the light reflected by the back plate 2 are easily emitted from the edge of the rubber frame 3; compared with the prior art, the backlight module in the embodiment utilizes the light guide plate in the foregoing embodiment, when light rays irradiate to the non-light incident surface 12, the micro unit 11 absorbs light rays with a larger angle, so that light rays collected at the side surface of the light guide plate 1 and light rays reflected by the backlight 2 are reduced, light rays emitted from the edge of the rubber frame 3 are reduced, side light leakage is reduced, formation of a bright edge can be prevented, and the quality of a picture in a visible area is improved.

Based on same utility model the design, the utility model also provides a display device, this display device includes: the backlight module as described in the above embodiments. Obviously, the display device of the present embodiment employs the backlight module of the foregoing embodiment, and accordingly has the technical effects of reducing side plate light leakage, preventing bright edge formation, and improving picture quality, which are brought by the light guide plate included in the backlight module.

It should be noted that the display device in this embodiment may be any product or component having a display function, such as a liquid crystal panel, electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a vehicle-mounted display, and the like.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. A light guide plate is characterized by comprising a light emitting surface, a bottom surface opposite to the light emitting surface, a light incident surface and a non-light incident surface, wherein the light incident surface and the non-light incident surface are connected with the light emitting surface and the bottom surface; the light incident surface is arranged corresponding to the light source, and a plurality of micro units used for absorbing light rays are arranged on the non-light incident surface at intervals.

2. The light guide plate according to claim 1, wherein the micro-unit comprises a groove and a light absorbing structure disposed on the groove.

3. The light guide plate according to claim 2, wherein the grooves are sequentially arranged at intervals along a direction from the light emitting surface to the bottom surface.

4. The light guide plate according to claim 2, wherein the light absorbing structure is a coating layer applied to the surface of the groove or a filling part filling the groove.

5. The light guide plate according to claim 2, wherein the light absorbing structure is black in color.

6. The light guide plate according to claim 2, wherein the groove has a depth of 50 to 100 μm, and a dimension of the groove along the direction from the light emitting surface to the bottom surface is 100 to 300 μm.

7. The light guide plate according to claim 2, wherein the groove has a cross-sectional shape of a parallelogram, a trapezoid or a triangle.

8. The light guide plate according to claim 2, wherein the groove is integrally injection-molded with the light guide plate.

9. A backlight module comprising the light guide plate according to any one of claims 1 to 8.

10. A display device comprising the backlight module according to claim 9.

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