CN215729190U - Backlight module and display device - Google Patents

Abstract

The application discloses backlight unit and display device, wherein, a backlight unit includes: a back plate; the circuit board is arranged on the back plate; the light-emitting element and the supporting device are arranged on the circuit board; and a light guide plate supported by the supporting means; wherein the support means at least partially surrounds the light emitting element. The light guide plate is better supported by the supporting device, so that the light mixing distance between the light guide plate and the LED is more uniform, and the uniformity of the outgoing screen is better improved; in the backlight module disclosed by the application, the supporting device is provided with the dimming device in the light path direction of the light-emitting element, and the opening angle of the LED is enlarged due to the increase of secondary light distribution, so that the mixed light between the LEDs is enhanced, the distance between the LEDs can be enlarged, the number of light source LEDs is reduced, the heat accumulation is reduced, and the risk of a hot-melting light guide plate is avoided or reduced.

Description

Backlight module and display device

Technical Field

The present application generally relates to the field of display technologies, and in particular, to a backlight module and a display device.

Background

Among the flat panel Display devices, a Liquid Crystal Display (LCD) has features of small size, low power consumption, relatively low manufacturing cost, no radiation, etc., and occupies a leading position in the current flat panel Display market.

The backlight type of the liquid crystal display device mainly comprises a direct type backlight and a side type backlight, the direct type backlight is a mainstream in the market because the partitions of the LED light source and the partitions of the liquid crystal display panel can be in one-to-one correspondence, and the effect of local dimming of the partitions is good, however, the direct type backlight module is thick in size and cannot meet the pursuit of the ultrathin liquid crystal display device in the market.

However, the liquid crystal display device of the edge-type backlight module has a problem of uniformity of a picture in a visible area.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide a backlight module and a display device, which can better support a light guide plate and make the light mixing distance between the light guide plate and the LEDs more uniform.

In a first aspect, the present application provides a backlight module, comprising:

a back plate;

the circuit board is arranged on the back plate;

the light-emitting element and the supporting device are arranged on the circuit board;

and a light guide plate supported by the supporting means;

wherein the support means at least partially surrounds the light emitting element.

Optionally, the supporting device includes a half-sleeve body or a sleeve body, the half-sleeve body partially surrounds the light-emitting element, and the sleeve body surrounds the light-emitting element.

Optionally, the support means comprises a plurality of support posts arranged around the light emitting element.

Optionally, a light adjusting device is disposed on the supporting device along the light path direction of the light emitting element.

Optionally, the light modulation device comprises a plurality of lenses arranged along the direction of the supporting light guide plate.

Optionally, the lens includes a first refractive surface close to the light emitting element and a second refractive surface far from the light emitting element, wherein at least one of the first refractive surface and the second refractive surface is a curved surface.

Optionally, one of the first refraction surface and the second refraction surface is a curved surface, and the other is a plane.

Optionally, at least part of the first refractive surface and/or the second refractive surface is/are rough.

Optionally, the roughness structure comprises a saw-tooth, a pattern or a frosted pattern.

Optionally, the light adjusting device further includes a light reflecting structure disposed on a side of the supporting device close to the optical film, where the light reflecting structure includes a reflective sheet or at least a portion of a surface of the reflective sheet is coated with a reflective material.

In a second aspect, the present application provides a display device including the backlight module described in any one of the above.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

the backlight module that this application embodiment provided passes through the better support light guide plate of strutting arrangement, makes the mixed light distance between light guide plate and the LED more even to the homogeneity that makes out the screen obtains better improvement.

In the backlight module disclosed by the application, the supporting device is provided with the dimming device in the light path direction of the light-emitting element, and the opening angle of the LED is enlarged due to the increase of secondary light distribution, so that the mixed light between the LEDs is enhanced, the distance between the LEDs can be enlarged, the number of light source LEDs is reduced, the heat accumulation is reduced, and the risk of a hot-melting light guide plate is avoided or reduced.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram of a light guide plate supporting method in the prior art;

FIG. 2 is a schematic view illustrating a light guide plate of the prior art being bent and deformed at a light incident side under the action of gravity;

FIG. 3 is a schematic view of another supporting structure of a light guide plate in the prior art;

fig. 4 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a supporting device according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of another support device provided in the embodiments of the present application;

FIG. 7 is a schematic structural diagram of another supporting device provided in the embodiments of the present application;

FIG. 8 is a schematic structural diagram of another support device provided in the embodiments of the present application;

FIG. 9 is an optical schematic of a concave lens;

FIG. 10 is a schematic structural diagram of a lens provided in an embodiment of the present application;

fig. 11 is a schematic structural diagram of a dimming device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of another dimming device provided in an embodiment of the present application;

FIG. 13 is a schematic diagram of a refractive surface according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a light reflecting structure according to an embodiment of the present application.

In the figure:

10. a back plate; 20. a circuit board; 30. a light emitting element; 40. a support device; 50. a light guide plate; 60. a display panel; 70. a lens; 80. a light reflecting structure; 90. a reflective film layer; 701. a first refractive surface; 702. a second refraction surface; 703. a coarse structure; 401. a half sleeve body; 402. a sleeve body; 403. and (4) a support column.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the utility model. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1, the conventional backlight module mainly supports the light guide plate by the supporting columns at the two ends of the back plate structure, and leaves out the light mixing distance a between the light guide plate and the LED lamp, because the display is vertically placed and the supporting columns of the light guide plate have only two ends, the center of the light guide plate can be bent and sagged under the action of gravity, resulting in uneven width of the light mixing distance a, as shown in fig. 2.

As shown in fig. 3, in another conventional backlight module, the supporting columns at two ends of the back plate structure are omitted to support the light guide plate, and the SMT stoppers on the PCB are used to support the light guide plate, so as to leave a light mixing distance a between the light guide plate and the LED lamp. Because the length of side income formula PCB board is limited, and the LED that need arrange is many, and the clearance between the lamp is less, can reserve the space of SMT dog limited, so the quantity that the dog was put is not many, and the effect of playing is not obvious.

The heat accumulated at the light incident side is high, and the light guide plate close to the light incident side is easy to soften and droop, so that the LED lamp beads are easy to crush by the light guide plate; because the width of side income formula PCB board is limited, so the circuit of PCB board is walked the line and is needed to pass through under the dog, and the light guide plate is supported to the dog, because small in quantity, the dog area is little, and the stress is few, and the atress is big, presses the circuit under the broken dog to walk the line easily, leads to the dead lamp of LB.

PCB: printed Circuit boards, also known as Printed Circuit boards, are important electronic components, support for electronic components, and carriers for electrical interconnection of electronic components.

SMT: surface Mounted Technology, also known as Surface mount Technology or Surface mount Technology, is a short description of a series of process flows for processing on the basis of printed circuit boards, and is a Technology and process that is popular in the electronic assembly industry.

LGP: the light guide plate, optics level ya keli/PC panel, panel surface design has the dot, is used for destroying the total reflection of light, turns into even area light source with the line light source.

Referring to fig. 4 in detail, the present application provides a backlight module, including:

a back plate 10;

a circuit board 20 disposed on the back plate 10;

a light emitting element 30 and a supporting device 40 provided on the circuit board;

and a light guide plate 50 supported by the supporting device 40;

wherein the support means 40 at least partially surrounds the light emitting element 50.

In the embodiment of the application, the backlight module provided by the application adopts a side-in type backlight module. Wherein, the light emitting component selects the LED light source, and the circuit board selects the PCB board.

The side-in type backlight module is to arrange LED components on the side opposite to the display area, convert the point light source emitted by the LED into a line light source by using the gap (light mixing distance a) between the light guide plate 50 and the LED light source and the micro-mechanism on the side of the light guide plate 50, enter the light guide plate 50, then change the line light source into a surface light source perpendicular to the exit of the light guide plate 50 through the optical dots (which destroy the total reflection of the light entering the light guide plate 50), and then diffuse, atomize and gather the light through the optical film above the light guide plate 50 to form a stable backlight source for use.

There are two main determining factors for the uniformity of the picture in the visible area of the side-entry backlight module: the optical dot layout at the bottom of the light guide plate 50 and the size uniformity of the light mixing gap (a) between the LED light sources and the light guide plate 50.

The Light mixing distance (a) affects the luminous flux entering the Light Guide Plate 50 (LGP), and in the area with a large distance, the more the luminance attenuation is, the less the luminous flux entering the Light Guide Plate 50 by the Light source LED, resulting in the reduction of the screen-out luminance in the area, and in the area with a small distance, the less the luminance attenuation is, the more the luminous flux entering the Light Guide Plate 50 by the Light source LED is, the higher the screen-out luminance in the area is than in the area with a large distance, so it can be seen that the uneven distance of the gap (a) on the Light-entering side will result in the reduction of the visible area screen uniformity of the backlight module.

It should be noted that, in the embodiment of the present application, a structure of a side-in type backlight module is illustrated, where the side-in type backlight source may be disposed at any edge position around a display area, and the disposing direction and the disposing position of the backlight source are not limited in the present application, and any manner of disposing is within the protection scope of the present application.

In some embodiments, as shown in fig. 5, the supporting device 40 includes a half-sleeve 401 for supporting the light guide plate 50, and the half-sleeve partially surrounds the light emitting element 30. The cross section of the half-sleeve body can be a right-angle shape, a circular shape or other shapes, the cross section shape of the half-sleeve body is not limited in the embodiment of the present application, and the size of the light emitting element 30 surrounding the half-sleeve body is also not specifically limited in the present application, and when the application is performed, the size of the display area or the number of the light emitting elements 30 can be adjusted.

It should be noted that the half-cover body in the embodiment of the present application can surround a part of the position of the light emitting element 30 in any direction, and in consideration of the arrangement of the following embodiments of the present application to the reflective structure, the half-cover body can be disposed at a position of the light emitting element 30 close to the display panel 60.

In some embodiments, as shown in fig. 6, the supporting device 40 includes a sheath 402, and the supporting column is used for supporting the light guide plate 50, and the sheath surrounds the light emitting element 30. It should be noted that the cross-sectional shape of the sleeve body may be circular, square or other shapes, the size of the sleeve body may be the same as the size of the light-emitting element 30, the package size matching the LED of the light-emitting element 30 is directly clamped and sleeved on the LED light source, and the size of the sleeve body may not match the size of the LED, and is fixed on the PCB by gluing. The present application is not particularly limited, and the size of the display region or the number of the light emitting elements 30 may be adjusted in application.

In some embodiments, as shown in fig. 7 and 8, the supporting device 40 includes a plurality of supporting pillars 403 disposed around the light emitting elements 30, and the supporting pillars are used for supporting the light guide plate 50. It should be noted that the number of the support columns may be two, three, four or more, the arrangement position of the support columns may be adjusted relative to the size of the light emitting element 30, and the arrangement position is not particularly limited in this application, and may be adjusted according to the size of the display area or the number of the light emitting elements 30 when applied.

Support column or the support dog that replaces current light guide plate 50 through strutting arrangement 40 in this application embodiment, better support light guide plate 50 makes mixed light distance A between light guide plate 50 and the LED more add evenly to the homogeneity that makes out the screen obtains better improvement.

In addition, a light adjusting device is provided on the supporting device 40 along the optical path direction of the light emitting element 30. The dimming device includes a plurality of lenses 70 disposed along a direction of supporting the light guide plate 50.

As shown in fig. 4, a D region inside a dotted line frame inside the light guide plate 50 is represented as a dot distribution region of the light guide plate 50, an arrow F1 indicates a light direction in which a light modulator is not provided in the prior art, and an arrow F2 indicates a light direction after secondary light distribution is performed by the light modulator in the embodiment of the present application.

According to the backlight module, secondary light distribution is carried out by adding the adjusting device, the light opening angle of the LEDs is enlarged, and light mixing among the LEDs is enhanced, so that the distance between the LEDs can be enlarged, the number of light source LEDs is reduced, heat accumulation is reduced, and the risk of the hot melting light guide plate 50 is avoided or reduced.

In the embodiment of the present application, as shown in fig. 4, the direction along which the light guide plate 50 is supported is the z-axis direction, the direction along which the LED lamp array is arranged is the x-axis direction, and the display panel 60 is arranged above the light guide plate 50, i.e., the y-axis direction. In some embodiments, the directions of the x-axis, y-axis, and z-axis may be interchanged.

In the embodiment of the present application, the lens 70 includes a first refractive surface 701 close to the light emitting element 30 and a second refractive surface 702 far from the light emitting element 30, wherein at least one of the first refractive surface 701 and the second refractive surface 702 is a curved surface. The material of the lens may be transparent PMMA (methyl methacrylate), or other high light transmittance material.

As shown in fig. 9, the light emitted from the LED light source has the strongest light intensity perpendicular to the normal viewing angle of the lamp bead, and after passing through the two curved surfaces, i.e., the first refraction surface 701 and the second refraction surface 702 of the lens 70, the strongest light perpendicular to the normal viewing angle is refracted for the second time to refract the light passing through the lens toward a large angle, so that the original point light sources of the LED can be diffused by controlling and designing the curvature of the radian of the two curved surfaces, thereby enhancing the light mixing effect, and mixing all the point light sources at the light incident side into a uniform line light source incident light guide plate 50.

In one embodiment, the first refraction surface 701 and the second refraction surface 702 are both curved surfaces, a curved bending direction of the first refraction surface 701 is directed from the light emitting device 30 to the light guide plate 50, and a curved bending direction of the second refraction surface 702 is directed from the light guide plate 50 to the light emitting device 30. The two curved surfaces form a concave lens, and are characterized by thin center and thick edge, and have a divergence effect on light.

In one embodiment, as shown in fig. 10, one of the first refraction surface 701 and the second refraction surface 702 is a curved surface, and the other is a flat surface. For example, the first refraction surface 701 is a curved surface, the curved surface of the first refraction surface 701 is bent in a direction from the light emitting element 30 to the light guide plate 50, and the second refraction surface 702 is a flat surface. Other forms that follow the principle of a concave lens may also be included in a particular arrangement. During its actual implementation, for better carrying out secondary grading, enlarge LED's opening light angle, do not do the restriction to the radian camber of two refracting surfaces in this embodiment, the principle that it followed is for can refract the lens with the LED light wide-angle that receives, it can to enlarge opening light angle.

It should be noted that, in the embodiment of the present application, the arrangement direction of the concave lens is arranged along the array direction of the light emitting element 30, that is, the two thick ends of the concave lens are arranged along the array direction of the light emitting element 30. The point light sources of the light emitting elements 30 in the array can be diverged to enhance the light mixing effect, so that all the point light sources on the light incident side are mixed into a uniform line light source incident on the light guide plate 50.

It should be noted that the embodiment of the present application shows a form in which a plurality of lenses are disposed on one supporting device 40, as shown in fig. 11, and in other embodiments, a plurality of lenses may be stacked along the supporting light guide plate 50 by disposing one lens on one supporting device 40, as shown in fig. 12, so as to achieve the effect of a plurality of lenses. Any way of implementing the superposition of multiple lenses is within the scope of the present application.

In one embodiment, as shown in fig. 13, at least a part of the first refraction surface 701 and/or the second refraction surface 702 is a rough structure 703. Wherein the roughness 703 includes, but is not limited to, a saw-tooth shape, a pattern, or a frosted pattern.

Specifically, the two refraction surfaces may be partially or completely made into irregular saw-tooth shapes or other various patterns, frosted patterns, etc. (without limitation), and the principle followed is that when the light of the LED lamp is incident, the light can be refracted, diffused, etc. at multiple angles, so that the light can be fully mixed, and the light can be more uniform before being incident on the light guide plate 50.

In one embodiment, the light adjusting device further comprises a light reflecting structure 80 disposed on a side of the supporting device 40 close to the optical film, wherein the light reflecting structure 80 comprises a reflective sheet or is at least partially coated with a reflective material, as shown in fig. 14. The light that incides this face of LED is reflected back through the reflective structure 80 who sets up in this application embodiment, when improving the utilization ratio of light, can eliminate because of the Hotspot lamp shadow phenomenon that the LED optics throws the diaphragm and produce.

In the embodiment of the application, the lens in the light modulation device mainly performs light scattering in the x-axis direction, namely, the light opening angle of the LED lamp in the x-axis direction is enlarged, so that light mixing between the LED lamp and the lamp is enhanced; one surface of the y-axis direction close to the display panel 60 is coated with a high-reflectivity material or provided with a reflector plate (the reflectivity is more than 90%), and light rays incident to the surface of the LED are reflected back, so that the light utilization rate is improved.

The side of the y-axis facing away from the display panel 60 is coated with a high reflectivity material or provided with a reflective sheet (reflectivity > 90%), and light incident on this side from the LEDs is reflected back by the reflective sheet. If the opening angle of the LED lamp in the y-axis direction is increased, the LED lamp is not covered, absorbed or reflected back, and passes through the upper membrane, a Hotspot lamp shadow phenomenon is generated.

It should be noted that, in some embodiments, the reflective film 90 is disposed on the lower portion of the light guide plate 50, and when the light reflecting structure 80 on the side of the y-axis direction away from the display panel 60 is disposed, the reflective film 90 on the lower portion of the light guide plate 50 may be extended to the position of the PCB, so that the same light reflecting effect may be generated. The arrangement mode of the light reflecting structure 80 is not limited in the embodiment of the application, and no matter which light reflecting structure 80 is used, the effect of reflecting the light incident to the surface of the LED can be realized.

The utility model provides a backlight module can solve the problem that the mixed light of the whole side of income light side is low from the homogeneity that the clearance of A value is uneven brought, guarantees that mixed light distance A is unanimous, replaces current SMT (surface Mounted technology) dog (Stopper) of location light guide plate 50 on PCB board (Printed Circuit Boards) simultaneously, avoids light guide plate 50 to crash the light source LED lamp pearl of income light side.

And, another function of this application is to light source LED lamp, carries out the secondary grading, enlarges the luminous angle of light source LED lamp, and the mixed light between the reinforcing light source LED lamp plays the interval (Pitch) between the increase LED lamp to fine solution is because of the Hotspot lamp shadow problem that the Pitch increase produced, reaches the effect of saving cost, and because of the reduction of LED lamp number, the light source calorific capacity that brings reduces simultaneously, avoids hot melt light guide plate.

In a second aspect, the present application provides a display device including the backlight module described in any one of the above.

The display device in the embodiment of the application may be a television, or may be a display device having a display function, such as a PC, a smart phone, a tablet computer, an e-book reader, an MP3(Moving Picture Experts Group Audio Layer III, motion Picture Experts compression standard Audio Layer) player, an MP4(Moving Picture Experts Group Audio Layer IV, motion Picture Experts compression standard Audio Layer) player, a portable computer, or the like.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the utility model to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the utility model, which fall within the scope of the utility model as claimed.

Claims (11)

1. A backlight module, comprising:

a back plate;

the circuit board is arranged on the back plate;

the light-emitting element and the supporting device are arranged on the circuit board;

and a light guide plate supported by the supporting means;

wherein the support means at least partially surrounds the light emitting element.

2. A backlight module according to claim 1, wherein: the supporting device comprises a half sleeve body or a sleeve body, the half sleeve body partially surrounds the light-emitting element, and the sleeve body surrounds the light-emitting element.

3. A backlight module according to claim 1, wherein: the support device comprises a plurality of support posts arranged around the light emitting element.

4. A backlight module according to claim 1, wherein: a light adjusting device is arranged on the supporting device along the light path direction of the light emitting element.

5. The backlight module according to claim 4, wherein: the light adjusting device comprises a plurality of lenses arranged along the direction of the supporting light guide plate.

6. A backlight module according to claim 5, wherein: the lens comprises a first refraction surface close to the light-emitting element and a second refraction surface far away from the light-emitting element, wherein at least one of the first refraction surface and the second refraction surface is a curved surface.

7. A backlight module according to claim 6, wherein: one of the first refraction surface and the second refraction surface is a curved surface, and the other one is a plane.

8. A backlight module according to claim 6, wherein: at least part of the first refraction surface and/or the second refraction surface is of a rough structure.

9. A backlight module according to claim 8, wherein: the coarse structure comprises saw-toothed shapes, patterns or frosted patterns.

10. The backlight module according to claim 4, wherein: the light adjusting device further comprises a light reflecting structure arranged on one side, close to the optical diaphragm, of the supporting device, and the light reflecting structure comprises a reflecting sheet or at least part of the surface of the reflecting sheet is coated with a reflecting material.

11. A display device, characterized in that: comprising a backlight module as claimed in any one of claims 1 to 10.

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