CN219122545U - Backlight module and display device - Google Patents

Abstract

The application relates to a backlight module and display device, backlight module includes: the back plate comprises a bottom plate and side plates, wherein the side plates are enclosed to form a cavity on the side wall of the bottom plate, the light emitting side array of the bottom plate is provided with a plurality of lamp beads, the light emitting side of each lamp bead is provided with one lens respectively, an included angle between the side plates and the bottom plate is an obtuse angle, the lens close to the side plates is a foldback lens, and the foldback lens is used for enabling partial light passing through the foldback lens to be refracted, and the rest of light is reflected. The problem of peripheral shadow of display screen that brings after contained angle between bottom plate and the curb plate is the obtuse angle has been improved to this application, sets up the lens that is close to the curb plate into reentrant lens, beats the light of lamp pearl to effective display area border and corner all around through the reflection, has realized that the backplate inclined plane is done big and the effect of complete machine side view thinning.

Description

Backlight module and display device

Technical Field

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

Background

At present, most of local dimming televisions adopt ultrathin direct type backlight designs, and as the whole television is thinner, the light mixing distance OD is very short, so that the distance between lamp beads is small, the lamp bead consumption is large, the backlight cost is high, and the driving is complex. In order to reduce the cost, the light mixing distance OD is increased, the distance between the lamp beads is increased, the use amount of the lamp beads is reduced, the backlight cost is greatly reduced, and the driving is simpler. However, increasing the light mixing distance OD increases the overall thickness of the back plate, and the common solution is to make the inclined surfaces around the back plate large, i.e. make the included angle between the back plate and the side plate of the back plate large, so as to reduce the thickness in visual effect.

However, the light-emitting angle of the lens limited by the regional dimming is limited, after the inclined plane of the backboard is enlarged, peripheral lamp beads are far away from the edge of the effective display region, and light rays emitted by the lamp beads cannot be effectively refracted in the past, so that the technical problems of peripheral shadow and poor subjective visual effect of the backlight module are caused.

Disclosure of Invention

The application aims to provide a backlight module and a display device, and aims to improve the peripheral brightness of the display device when the included angle between the bottom plate and the side plate of the back plate is larger, so that the difference between the peripheral brightness and the central area brightness of the display device is reduced, and the overall brightness display effect is more uniform.

In a first aspect, an embodiment of the present application provides a backlight module, including backplate, lamp plate, a plurality of lamp pearl and a plurality of lens, the backplate includes bottom plate and curb plate, the curb plate enclose and close in the bottom plate lateral wall forms the cavity, be equipped with the lamp plate in the cavity, the light-emitting side array of bottom plate distributes and has a plurality of the lamp pearl, each the light-emitting side of lamp pearl sets up one respectively the lens, the curb plate with contained angle between the bottom plate is the obtuse angle, is close to the curb plate the lens is the lens of turning back, the lens of turning back is used for making the process the partial light of lens of turning back takes place the refraction, and other part light takes place the reflection.

In an embodiment of the present application, the first cavity is opened towards one side corresponding to the lamp bead by the foldback lens, and the lamp bead is disposed in the first cavity.

In one embodiment of the present application, a surface of the foldback lens facing away from the bottom plate is recessed toward the bottom plate.

In one embodiment of the present application, the foldback lens includes: the reflecting mirror surface is positioned on one surface of the foldback lens, which is away from the bottom plate, and the reflecting mirror surface is recessed towards the direction of the bottom plate; and a refractive mirror surface located on a peripheral side of the folding lens, the refractive mirror surface protruding toward a direction away from the folding lens.

In one embodiment of the present application, the lens remote from the side plate is a refractive lens, and the refractive lens is used for refracting all light rays passing through the refractive lens.

In an embodiment of the present application, the refractive lens is provided with a second cavity towards one side corresponding to the lamp bead, and the lamp bead is disposed in the second cavity.

In one embodiment of the present application, the refractive lens is a convex lens, and a central position of a face of the refractive lens facing away from the bottom plate is recessed toward the direction of the bottom plate.

In one embodiment of the present application, the included angle between the side plate and the bottom plate ranges from 125 ° to 155 °.

In an embodiment of the application, the light mixing distance of the backlight module is 5mm-10mm, and the distance between adjacent lamp beads is 20mm-40mm.

The embodiment of the application also provides a display device, which comprises: a display panel; and a backlight module according to any one of the first aspect, the backlight module being disposed on a backlight side of the display panel, the backlight module being configured to provide a light source to the display panel.

According to the embodiment of the application, the backlight module comprises a back plate, a lamp panel, a plurality of lamp beads and a plurality of lenses, wherein the back plate comprises a bottom plate and side plates, the side plates enclose in the bottom plate side wall forms a cavity, the lamp panel is arranged in the cavity, the light emitting side array is distributed with a plurality of the lamp beads, the light emitting sides of the lamp beads are respectively provided with one lens, the included angle between the side plates is an obtuse angle, the lenses close to the side plates are foldback lenses, the foldback lenses are used for enabling partial light rays passing through the foldback lenses to be refracted, the light paths are prolonged by reflection of the rest light rays, and the light rays are beaten to the periphery and corners of an effective display area.

This application is through setting up the lens of peripheral lamp pearl into the lens of turning back, and the lens of turning back makes the partial light that passes through this lens take place the refraction, and partial light takes place the reflection, extension light path to guarantee that the light-emitting of border all around is more, and the visual effect is more even, improves peripheral shadow and the poor problem of main pipe visual effect, in order to realize under the condition that the contained angle is super-large obtuse angle between bottom plate and the curb plate of backplate, visual effect thinning's effect in appearance.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the drawings, like parts are designated with like reference numerals. The drawings are not drawn to scale, but are merely for illustrating relative positional relationships, and the layer thicknesses of certain portions are exaggerated in order to facilitate understanding, and the layer thicknesses in the drawings do not represent the actual layer thickness relationships.

FIG. 1 is a top view of a prior art backlight module with a mixing distance OD5 mm;

FIG. 2 is a side view of the backlight module based on FIG. 1;

FIG. 3 shows a top view of a prior art backlight module with a mixing distance OD10 mm;

FIG. 4 is a side view of the backlight module based on FIG. 3;

fig. 5 shows a top view of a backlight module according to an embodiment of the present application;

fig. 6 shows a side view of a backlight module according to an embodiment of the present application;

fig. 7 shows an imaging schematic diagram of a foldback lens of a backlight module according to an embodiment of the present application;

fig. 8 shows an imaging schematic diagram of a refractive lens of a backlight module according to an embodiment of the present application;

fig. 9 shows a side view of a display device of an embodiment of the present application.

Reference numerals illustrate:

100. a backlight module; 10. a back plate; 11. a bottom plate; 12. a side plate; 20. a lamp panel; 21. a lamp bead; 30. a refractive lens; 31. a second chamber; 40. a return lens; 41. a first chamber; 42. a reflecting mirror surface; 43. refractive mirror.

200. A display panel; 201. an array substrate; 202. a color film substrate; 203. and a liquid crystal layer.

Detailed Description

Features and exemplary embodiments of various aspects of the present application are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing an example of the present application. In the drawings and the following description, at least some well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present application; also, the size of the region structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

With the progress of the age, there is a higher demand for display technology of television sets. Such as higher definition, higher color display, higher image refresh rate, higher contrast, thinner appearance. In the mainstream lcd tv at present, since the lcd panel itself does not emit light, only the backlight source emits light to penetrate the lcd panel, and the viewer can see the display image of the liquid crystal from the front. In a quite long period of time, the light intensity emitted by the backlight source is constant, so that the contrast ratio of the television can only be represented by the gray level of the liquid crystal panel, and the contrast ratio value of the liquid crystal television is different from hundreds to thousands according to different manufacturing processes of the liquid crystal panel. In contrast to millions of contrast in active light emitting plasma televisions and organic light emitting semiconductor (OLED) televisions, liquid crystal televisions cannot be contrasted at all. The backlight area dimming technology perfectly solves the problem of the short board of the liquid crystal television, the basic principle is that the backlight also realizes dynamic display, the backlight is brighter in the area with bright liquid crystal display than the original backlight, and the backlight is directly turned off for non-light emission in the area with non-bright liquid crystal display, so that the million-level contrast ratio can be realized.

The liquid crystal display device generally includes a liquid crystal display panel and a backlight module 100, wherein the liquid crystal display panel is a non-emissive light receiving element, and the backlight module 100 is disposed on a backlight surface side of the liquid crystal display panel and is used for providing a light source for the liquid crystal display panel so that the liquid crystal display panel displays an image.

At present, most of local dimming televisions adopt ultrathin direct type backlight designs, because the whole television is thinner, the light mixing distance OD is short, as shown in fig. 1 and 2, taking the light mixing distance OD5mm as an example, the inclination angle of the back plate 10 is 135 degrees, and the distance between any two lamp beads 21 (LEDs) of the back plate 10 is 20mm, which has the disadvantages of more lamp beads 21, high backlight cost and complex driving.

In order to reduce the cost, the light mixing distance OD is increased, as shown in fig. 3 and 4, the light mixing distance OD is increased to 10mm, the inclination angle of the back plate 10 is 125 °, the distance between any two lamp beads 21 of the back plate 10 is 40mm, uniform backlight can be realized, the consumption of the lamp beads 21 is reduced by half, the backlight cost is greatly reduced, and the driving is simpler.

However, the light mixing distance OD10mm is 5mm relative to the light mixing distance OD5mm, the overall thickness of the back plate 10 is increased by 5mm, and the current general method of direct-type backlight is to make the inclined planes around the back plate large, even if the bottom plate 11 and the side plate 12 of the back plate 10 have a larger obtuse angle, so that the side view effect is thinner. However, the limitation of the light emitting angle of the lens limited by the regional dimming is that after the inclined plane of the back plate is enlarged, the peripheral lamp beads 21 are far away from the edge of the effective display region, and the light cannot be refracted in the past, so that the periphery is dark and the subjective visual effect is poor.

Referring to fig. 5 and 6, the embodiment of the present application provides a backlight module 100 and a liquid crystal display device including the backlight module 100, the backlight module 100 includes a back plate 10, a lamp panel 20, a plurality of lamp beads 21 and a plurality of lenses, the back plate 10 includes a bottom plate 11 and a side plate 12, the side plate 12 encloses in the side wall of the bottom plate 11 to form a cavity, the lamp panel 20 is disposed in the cavity, a plurality of lamp beads 21 are distributed on an emitting side array of the bottom plate 11, one lens is disposed on an emitting side of each lamp bead 21, an included angle between the side plate 12 and the bottom plate 11 is an obtuse angle, the lens close to the side plate 12 is a foldback lens 40, and the foldback lens 40 is used for refracting part of light passing through the foldback lens 40, and the rest of light is reflected. This application is through setting up the lens of outlying lamp pearl 21 into the lens 40 that turns back, and the lens 40 that turns back makes the partial light that passes through this lens take place the refraction, and partial light takes place the reflection, extension light path to guarantee that the light-emitting at border all around is more, and the visual effect is more even, improves peripheral shadow and the poor problem of main pipe visual effect, in order to realize under the circumstances that the contained angle is super-large obtuse angle between bottom plate 11 and curb plate 12 of backplate 10, visual effect thinning's effect in appearance.

The specific structure of the backlight module 100 and the liquid crystal display device including the backlight module 100 according to the embodiments of the present application are described below with reference to the accompanying drawings.

First embodiment

Referring to fig. 7, the folding lens 40 is a concave lens with a concave top, and the periphery of the lens can refract light and the top can reflect light, and the folding lens 40 reflects part of the light passing through the folding lens to reach the periphery edge and corner of the effective display area, so as to achieve the effects of large inclined plane of the back plate 10 and thinning the whole side view.

With continued reference to fig. 7, a first chamber 41 is formed on a side of the turn-back lens 40 facing the lamp bead 21, the lamp bead 21 is disposed in the first chamber 41, the lamp bead 21 and the turn-back lens 40 form an inner wall of the first chamber 41, the first chamber 41 is hollowed out at a middle position of a side of the turn-back lens 40 facing the bottom plate 11, and the first chamber 41 is hollowed out to prevent interference between the turn-back lens 40 and the lamp bead 21 due to the fact that the lamp bead 21 has a height of 0.6mm, after the lamp bead 21 is mounted, a gap is formed between the lamp bead 21 and the turn-back lens 40, so that the turn-back lens 40 forms a secondary optical lens, that is, light emitted by the lamp bead 21 at the first time enters the turn-back lens 40 from air of the first chamber 41, and the second time is air entering the cavity from the turn-back lens 40.

Further, a surface of the folded lens 40 facing away from the bottom plate 11 is recessed toward the bottom plate 11, so that the folded lens 40 is a concave lens. Specifically, referring to fig. 6, the foldback lens 40 includes: a reflection mirror surface 42 located on a surface of the return lens 40 facing away from the base plate 11, the reflection mirror surface 42 being recessed toward the base plate 11; and a refractive mirror surface located on the peripheral side of the folding lens 40, the refractive mirror surface protruding in a direction away from the folding lens 40.

From this, some light gets into the lens 40 of turning back from first cavity 41, and the air in the entering cavity of reflection through reflection mirror 42 again, and other part light gets into the lens 40 of turning back from first cavity 41, and the air in the entering cavity of refraction through the refraction mirror surface again, and wherein the light that reflects out can reflect on bottom plate 11 again, and the light-emitting angle is big to the extension light path, the light-emitting angle of the light after the refraction is little, guarantees regional effect of regional dimming.

In addition, the lens far from the side plate 12 is a refractive lens 30, and the refractive lens 30 is used for refracting all light rays passing through the refractive lens 30. In this embodiment, the peripheral lenses are changed to be the foldback lenses 40, so that the bevel edge folding angle of the back plate 10 is greatly increased, and the effect of thinning the appearance side view is achieved. Meanwhile, the rest lenses adopt the refraction lenses 30 so as to keep smaller light emergent angles of the refraction lenses 30, so that better performance in regional dimming is achieved, and the middle refraction lenses 30 keep smaller light emergent angles so that light interference between adjacent lamp beads 21 is not easy to occur.

Further, as shown in fig. 8, the second chamber 31 is formed on the side of the refractive lens 30 facing the corresponding lamp bead 21, the lamp bead 21 is disposed in the second chamber 31, the lamp bead 21 and the refractive lens 30 form a space between the inner walls of the second chamber 31, that is, the second chamber 31 is hollowed out at the middle position of the side of the refractive lens 30 facing the bottom plate 11, and since the lamp bead 21 has a height of 0.6mm, the hollowed-out position of the second chamber 31 can prevent the refractive lens 30 from interfering with the lamp bead 21 due to the installation, and after the installation, the lamp bead 21 has a gap from the refractive lens 30, so that the refractive lens 30 forms a secondary optical lens, that is, the light emitted from the first lamp bead 21 enters the refractive lens 30 from the air of the second chamber 31, and the second time is the air entering the cavity from the refractive lens 30.

With continued reference to fig. 8, the refractive lens 30 is a convex lens, and the light emitted from the lamp beads 21 enters the convex lens from the air in the second chamber 31, and then the refractive lens 30 is recessed toward the bottom plate 11 at a center position of a surface facing away from the bottom plate 11 with a smaller light-emitting angle. Since the light-emitting angle of the refractive lens 30 is small, the problem of excessive brightness at the middle position of the top of the lamp beads 21 is easily caused, and the central position of the top of the refractive lens 30 is provided with a recess, so as to prevent the excessive brightness at the central position of each lamp bead 21.

In this embodiment, by arranging a circle of lamp beads 21 with the turn-back lenses 40 at the outermost periphery and arranging the refractive lenses 30 at the other lamp beads 21, it is ensured that the brightness of the display device is uniform throughout the time when the included angle between the side plate 12 and the bottom plate 11 is within the range of 125 ° -155 °.

It should be noted that, the outermost periphery is not limited to the folded lens 40, but may be two or more rows of lenses, and the outermost periphery is not limited to the folded lens 40, and may be selected from other optical lenses with larger light angle, which is not described here.

And, the light mixing distance OD of the backlight module 100 is in the range of 5mm-10mm, and the distance between adjacent lamp beads 21 is in the range of 20mm-40mm. The light mixing distance refers to the height dimension of the bottom plate 11 from the cavity between the optical film groups, so that the light rays emitted by the lamp beads 21 are mixed with each other.

It should be noted that, the light mixing distance OD is determined according to the product requirement, and the present application uses the light mixing distance OD5mm and the light mixing distance OD10mm as examples to facilitate visual explanation, and no matter how much the light mixing distance OD value is, the area dimming backlight design belongs to the protection scope of the present application.

As an example, the lamp panel 20 includes a circuit board and a plurality of Light Emitting elements disposed on the circuit board, wherein the Light Emitting elements may be Light-Emitting diodes (LEDs) of conventional size, and may be submillimeter Light-Emitting diodes (Mini-LEDs). Mini-LEDs refer to LED devices with die sizes of 100-300 μm. The LED or Mini-LED is used as a self-luminous element for display, and has the advantages of low power consumption, high brightness, high resolution, high color saturation, high reaction speed, long service life, high efficiency and the like.

The back plate 10 may be made of a metal material, such as any one of aluminum plate, aluminum alloy plate, or galvanized steel, and may be manufactured by a stamping process. The metal material has better ductility, and can protect the backlight module 100 from being broken easily under the impact of external force. The back plate 10 may also be made of plastic material, such as polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene, etc., so as to reduce the weight of the backlight module 100 and the cost of the backlight module 100. The shape of the back plate 10 may be the same as that of the liquid crystal display panel 200 using the backlight module 100, for example, when the shape of the liquid crystal display panel 200 is rectangular, the shape of the back plate 10 of the backlight module 100 using it is also rectangular. The shape of the back plate 10 may vary from embodiment to embodiment.

Second embodiment

Referring to fig. 9, in a first embodiment, a liquid crystal display device is provided according to the present embodiment, including: a display panel 200; and the backlight module 100 according to the first embodiment, the backlight module 100 is disposed on the backlight side of the display panel 200, and the backlight module 100 is configured to provide a light source for the display panel 200.

The outer periphery of the display panel 200 may be directly adhered to the backlight module 100 by using a foam adhesive, wherein the foam adhesive is a double sided adhesive, and the material of the display panel 200 is liquid crystal glass.

Specifically, the display panel 200 includes an array substrate 201, a color film substrate 202, and a liquid crystal layer 203 disposed between the array substrate 201 and the color film substrate 202, wherein the backlight module 100 is disposed on a backlight side of the array substrate 201.

The display panel 200 may be a single display panel 200 or may be a double display panel 200 stacked in the thickness direction. When the display panel 200 is a dual display panel 200, the display panel 200 at the bottom layer is used for controlling light, and the display panel 200 at the top layer is used for displaying, so that the contrast ratio of the liquid crystal display device can be improved.

It can be appreciated that the technical solution of the backlight module provided In the embodiments of the present application may be widely used to provide light sources for various display panels, such as TN (Twisted Nematic) display panels, IPS (In-Plane Switching) display panels, VA (Vertical Alignment) display panels, MVA (Multi-Domain Vertical Alignment, multi-quadrant vertically aligned) display panels.

It should be readily understood that the terms "on … …", "above … …" and "above … …" in this application should be interpreted in the broadest sense such that "on … …" means not only "directly on something" but also includes the meaning of "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes the meaning of "not only" on something "or" above "but also" above "or" above "without intermediate features or layers therebetween (i.e., directly on something).

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. The backlight module comprises a back plate, a lamp panel, a plurality of lamp beads and a plurality of lenses, wherein the back plate comprises a bottom plate and side plates, the side plates are enclosed on the side walls of the bottom plate to form a cavity, the lamp panel is arranged in the cavity, the lamp beads are distributed on the light emitting side of the bottom plate in an array manner, the lenses are respectively and correspondingly arranged on the light emitting side of each lamp bead,

the included angle between the side plate and the bottom plate is an obtuse angle, the lens close to the side plate is a foldback lens, and the foldback lens is used for refracting part of light passing through the foldback lens and reflecting the rest of light.

2. The backlight module according to claim 1, wherein the foldback lens is provided with a first chamber toward a side corresponding to the lamp bead, and the lamp bead is disposed in the first chamber.

3. A backlight module according to claim 1, wherein a face of the foldback lens facing away from the bottom plate is recessed toward the bottom plate.

4. A backlight module according to claim 3, wherein the return lens comprises:

the reflecting mirror surface is positioned on one surface of the foldback lens, which is away from the bottom plate, and the reflecting mirror surface is recessed towards the direction of the bottom plate; and

and the refraction mirror surface is positioned on the periphery side of the foldback lens and protrudes towards the direction deviating from the foldback lens.

5. A backlight module according to any one of claims 1 to 4, wherein the lens remote from the side plate is a refractive lens for refracting all light passing through the refractive lens.

6. A backlight module according to claim 5, wherein the refractive lens has a second cavity facing the side corresponding to the lamp bead, and the lamp bead is disposed in the second cavity.

7. A backlight module according to claim 5, wherein the refractive lens is a convex lens, and a center position of a surface of the refractive lens facing away from the bottom plate is recessed toward the bottom plate.

8. A backlight module according to claim 1, wherein the angle between the side plate and the bottom plate is in the range of 125 ° -155 °.

9. A backlight module according to claim 1, wherein the light mixing distance of the backlight module is in the range of 5mm-10mm, and the distance between adjacent lamp beads is in the range of 20mm-40mm.

10. A display device, comprising:

a display panel; and

the backlight module according to any one of claims 1-9, wherein the backlight module is disposed on a backlight side of the display panel, and the backlight module is configured to provide a light source to the display panel.

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