CN111679498A - Backlight module and display device - Google Patents

Abstract

The application discloses backlight unit and display device, backlight unit includes: the substrate is provided with a central area and at least one edge area surrounding the central area, the substrate is also provided with a continuous first surface, the first surface extends from the central area to the edge area, and in the edge area, the first surface also comprises an extending surface which is a surface formed by deviating the first surface from the central area in the edge area; the thickness of the substrate in the edge region is smaller than the thickness of the substrate in the central region.

Description

Backlight module and display device

Technical Field

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

Background

Compared with the traditional side-in backlight module (BLU), the mini LED backlight module in the current stage is more concerned due to the advantages of high brightness, ultra-narrow frame, partition light control, special shape and the like; at present, the industry can manufacture small-size (such as mobile phones) in one-step molding mode, but the size of the equipment is limited, and the mode of splicing a plurality of mini LED backlight modules in medium and large sizes can be adopted to realize larger size. Referring to fig. 1 and 2, the structure of the conventional side-in type backlight module is compared with that of the miniLED backlight module, where fig. 1 is a schematic structural diagram of the conventional side-in type backlight module, and fig. 2 is a schematic structural diagram of the miniLED backlight module. As shown in fig. 1, the conventional side-type backlight module includes: the backlight module comprises a back plate 1, a reflecting layer 7, a substrate 2, a diffusion plate 5 and a prism sheet 6 which are sequentially stacked, wherein a light source 3 comprises an electroluminescent device 31, the electroluminescent device 31 is arranged on the side wall of the substrate 2, and the substrate 2 is a PCB (printed circuit board) substrate or an FPC (flexible printed circuit) substrate; as shown in fig. 2, the mini LED backlight module includes a back plate 1 arranged in a stacked manner; a substrate 2; a light source layer 3 disposed on the substrate 2, the light source layer 3 including a plurality of mini LED devices 31; a fluorescent film 4 disposed on the light source layer 3 and entirely covering the mini LED device 31 and the substrate 2; the optical film material is arranged on one side, away from the back plate 1, of the fluorescent film 4 and comprises a diffusion film 5 and a prism sheet 6; wherein, a metal conductive layer (not shown) is disposed on the substrate 2, and the electrode of the mini LED device 31 is electrically connected with the metal conductive layer of the substrate 2.

A common mini LED backlight module covers a resin protective layer on the surface of an LED, one of the common mini LED backlight module is transparent, and a similar quantum dot film (QD film) isochromatic conversion film layer is added during subsequent assembly to become white light; the other is that yellow fluorescent powder is directly added into transparent resin to prepare a fluorescent film, so that the fluorescent film can be converted into white light; fig. 3 shows a structure of the latter, and specifically fig. 3 is a schematic diagram of a mini LED backlight module. The mini LED backlight module comprises a substrate layer 2, the substrate layer 2 comprises a plurality of substrates 20 arranged in a splicing manner, a splicing seam 210 is arranged between at least two adjacent substrates 20, in fact, the protective glue which is transparent or added with fluorescent powder can cover the boundary of the substrates at most, due to poor assembly and splicing work, no light is LED out from the seam (in the area of the dotted frame shown in fig. 3), and the thickness of the backlight module is required to be thinner and thinner, so that the reserved light mixing space (OD) is more limited, so that a dark line is visually formed at the seam between each substrate due to uneven light mixing, the phenomenon is shown in a circle shown in fig. 4, fig. 4 is a schematic diagram of the effect of the dark line of the splicing area, and as shown in fig. 4, the splicing seam 210 between the first substrate 201 and the second substrate 202 generates the dark line.

Disclosure of Invention

The embodiment of the application provides a backlight module and a display device, wherein the backlight module comprises a substrate and a plurality of light-emitting devices arranged on the substrate, the substrate is provided with a central area and at least one edge area, the substrate is provided with a continuous first surface, and the first surface extends from the central area to the edge area; and in the edge region, the first surface includes an extended surface, which is a surface formed by the first surface deviating from the central region in the edge region; and arranging the light emitting device on the extension surface, wherein the light emitting device is a mini LED, and the extension surface can deflect the light rays of the edge area relative to the light rays of the central area and conduct the light rays to the edge area, so that the aim of improving the dark lines of the edge area is fulfilled.

The embodiment of the application provides a backlight unit, backlight unit includes: the substrate is provided with a central area and at least one edge area surrounding the central area, the substrate is further provided with a continuous first surface, the first surface extends from the central area to the edge area, and in the edge area, the first surface further comprises an extending surface, and the extending surface is a surface formed by deviating the first surface from the central area in the edge area.

In some embodiments, the thickness of the substrate in the edge region is less than the thickness of the substrate in the central region.

In some embodiments, the substrate further has a continuous second surface disposed opposite to the first surface, wherein the extension surface extends to form an included angle with the second surface in the process of extending from the central region to the edge region.

In some embodiments, the extension surface is an inclined surface.

In some embodiments, the backlight module further includes a fluorescent film disposed on the light emitting device and covering the light emitting device and the substrate.

In some embodiments, the backlight module further includes a diffusion film disposed on a side of the fluorescent film facing away from the substrate.

In some embodiments, the backlight module further comprises a prism film disposed on a side of the diffusion film facing away from the substrate.

In some embodiments, the substrate is a glass substrate.

In some embodiments, the light emitting device is a mini LED.

The embodiment of the present application further provides a display device, which includes the backlight module as described above, and further includes a display panel, wherein the display panel includes a first substrate, a second substrate, and a liquid crystal layer disposed between the first substrate and the second substrate.

The backlight module comprises a substrate and a plurality of light-emitting devices arranged on the substrate, wherein the substrate is provided with a central area and at least one edge area, the substrate is provided with a continuous first surface, and the first surface extends from the central area to the edge area; and in the edge region, the first surface includes an extended surface, which is a surface formed by the first surface deviating from the central region in the edge region; the thickness of the substrate in the edge region is less than the thickness of the substrate in the central region; the light emitting device is arranged on the extending surface and is a mini LED, and the extending surface can enable the light rays in the edge area to deflect relative to the light rays in the central area and conduct the light rays to the edge area, so that the aim of improving the dark lines of the edge area is fulfilled.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a conventional side-entry backlight module.

FIG. 2 is a schematic structural diagram of a mini LED backlight module.

FIG. 3 is a schematic diagram of a mini LED backlight module.

Fig. 4 is a schematic diagram of the effect of the dark lines of the splice area.

FIG. 5 is a schematic cross-sectional view of a mini LED backlight module.

FIG. 6 is a diagram of the splicing effect of a mini LED backlight module.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 5 and 6, fig. 5 is a schematic cross-sectional view of a mini LED backlight module; FIG. 6 is a diagram of the effect of splicing miniLED backlight module. As shown in fig. 5 and fig. 6, in the present embodiment, a backlight module is provided, which includes a substrate 1, a plurality of light emitting devices 2 disposed on the substrate 1, a fluorescent film 3 disposed on the plurality of light emitting devices 2 and covering the light emitting devices 2 and the substrate 1 in front, and a diffusion film 4 disposed on a side of the fluorescent film 3 away from the substrate 1. In this embodiment, the backlight module further includes a back plate disposed on a side of the substrate 1 away from the prism film.

As shown in fig. 5, the substrate 1 has a central region 10 and at least one edge region 11 surrounding the central region 10, the substrate 1 has a continuous first surface 12, and the first surface 12 extends from the central region 10 to the edge region 11; in the edge region 11, the first surface 12 further includes an extending surface 13, the extending surface 13 is a surface formed by the first surface 12 deviating from the central region 10 in the edge region 11, that is, the first surface 12 corresponds to the central region 10 and the edge region 11, the extending surface 13 corresponds to the edge region 11, a region of the first surface 12 other than the extending surface 13 defines a central surface 14, and the extending surface 13 and the central surface 14 are connected to form a continuous first surface 12.

As shown in fig. 5, the substrate 1 further has a continuous second surface 15, the second surface 15 is disposed opposite to the first surface 12, wherein the extension plane 13 extends in a direction from the central region 10 to the edge region 11, and the extension plane 13 extends to form an included angle 16 with the second surface 15.

In the present embodiment, the thickness of the substrate 1 in the edge region 11 is smaller than the thickness of the substrate 1 in the central region 10, wherein the height of the extension plane 13 of the substrate 1 from the second surface 15 in the direction extending from the central region 10 to the edge region 11 gradually decreases. Here, as a preferred embodiment, the second surface 15 is a flat surface, the extension surface 13 is an inclined surface, and the central surface 14 is a flat surface disposed parallel to the second surface 15.

In the embodiment of the present application, an orthographic projection of the edge region 11 on the second surface 15 of the substrate 1 is defined as a light compensation region, where the light compensation region is a region with a darker emergent light, that is, a region that needs to compensate light, for example, the light compensation region may also be a region with uneven brightness caused by local damage or failure of the plurality of light emitting devices 2 or unevenness of the fluorescent film 3.

In the present embodiment, the light emitting device 2 is provided as a light source on the extension face 13; due to the deviation of the extending surface 13 relative to the first surface 12, the light-emitting angle of the light-emitting device 2 on the extending surface 13 is deflected relative to the light-emitting angle of the light-emitting device 2 on the first surface 12, so that the light rays of the light-emitting device 2 on the extending surface 13 are all deflected towards the direction of the light supplement region, thereby changing the conventional light-emitting angle, the extending surface 13 is used for guiding the light rays of the light-emitting device 2 to the diffusion film 4 (shown in fig. 6) of the light supplement region, and the diffusion film 4 is used for enabling the light rays of the plurality of light-emitting devices 2 to be uniformly emitted.

It should be noted that, in the present embodiment, the substrate 1 is a glass substrate. Compared with the conventional substrate in the prior art, the conventional substrate is generally a PCB substrate or an FPC substrate, and because the PCB substrate or the FPC substrate is formed by laminating multiple layers of resin, an ideal shape cannot be prepared by simple processing techniques such as cutting and grinding, in this embodiment, the substrate 1 is a glass substrate, and can replace the conventional PCB substrate and the conventional FPC substrate, and the substrate 1 can be directly cut into a required shape, for example, the extending surface 13 is formed by cutting at least one side edge of the first surface 12 of the substrate 1, and the cutting manner is cutter wheel cutting or laser cutting. The extension face 13 formed by cutting in this embodiment is an inclined face, that is, the extension face 13 is an inclined plane, the longitudinal section of the substrate 1 on the side away from the back plate is of a solid regular trapezoid structure, and the longitudinal section of the substrate 1 on the side close to the back plate is of a solid rectangular structure.

In some embodiments, the substrate 1 includes a TFT substrate as a driving circuit substrate, the TFT substrate includes a substrate and a metal conductive layer disposed on the substrate, a plurality of light emitting devices 2 are further disposed on the substrate 1, and electrodes of the plurality of light emitting devices 2 on the substrate 1 are electrically connected to the metal conductive layer on the substrate 1, i.e., the TFT substrate; as a preferred embodiment, the plurality of light emitting devices 2 are arranged on the substrate 1 in an array. The light emitting device 2 is also provided on the extended surface 13 of the substrate 1.

It should be further noted that a groove is formed in one side of the substrate 1 close to the light emitting device 2, the metal conductive layer is accommodated in the groove, the light emitting device 2 is partially accommodated in the groove and electrically connected to the metal conductive layer, and the groove is designed to facilitate fixing of the plurality of light emitting devices 2; alternatively, the light emitting device 2 may be electrically connected to the metal conductive layer of the substrate 1 by bulk transfer. Wherein the metal conductive layer is formed on the first surface 12 of the substrate 1 by an exposure and development process.

Referring to fig. 6, in the present embodiment, the backlight module includes a plurality of substrates 1 arranged in a splicing manner and a glue material structure 21 disposed between adjacent substrates 1, where the glue material structure 21 is used to bond adjacent substrates 1, and the material of the glue material structure 21 includes but is not limited to at least one of a double-sided tape, a water adhesive, and an optical adhesive; the side edge of each substrate 1 is provided with one extending surface 13, the extending surfaces 13 of the adjacent substrates 1 are respectively distributed on two sides of the adhesive material structural member 21, and the orthographic projections of the extending surfaces 13 of the two adjacent substrates 1 and the adhesive material structural member 21 in the backlight direction are light supplementing regions 22. The plurality of substrates 1 are provided with a plurality of light emitting devices 2, the plurality of substrates 1 are each provided with the extending surface 13, and the light emitting devices 2 are provided on the extending surfaces 13 of the plurality of substrates 1 as light sources.

As shown in fig. 6, in the present embodiment, the light source on the extending surface 13 is transmitted to the diffusion film 4 of the light compensation area 22, so as to solve the problem that the light source of the substrate 1 in the prior art cannot be transmitted to the diffusion film 4 of the light compensation area 22 and generate light, thereby achieving the purpose of solving the problem that the existing spliced mini LED backlight module generates a spliced dark line at the spliced position.

In another embodiment, the extending surface 13 may be a curved surface that satisfies a light guiding requirement, for example, the extending surface 13 may be a concave curved surface on which the light emitting device 2 is disposed, and the light source of the light emitting device 2 on the concave curved surface may be transmitted to the diffusion film 4 of the light compensation region 22 due to the converging action of the concave curved surface on the light.

In addition, the backlight module further comprises a packaging adhesive layer, the packaging adhesive layer is arranged between the metal conducting layer of the substrate 1 and the plurality of light emitting devices 2, and the packaging adhesive layer is insulating adhesive or optical adhesive; as a preferred embodiment, the encapsulation adhesive layer is a silica gel layer, the encapsulation adhesive layer is used for performing multi-surface encapsulation on the plurality of light emitting devices 2, the encapsulation adhesive layer is used for enabling connection portions between the electrodes of the plurality of light emitting devices 2 and the metal conductive layer to be in an insulating state, and the insulating adhesive of the encapsulation adhesive layer is mainly used for fixing the plurality of light emitting devices 2.

In the above embodiments of the present invention, the light emitting devices 2 are all mini LEDs. The mini LED can be connected with a specific power supply through the metal wiring layer of the substrate 1 to control light emitting or non-light emitting, the mini LED can emit red light, blue light, green light and the like, and the color of the light emitted by the mini LED is mainly determined by the material and the light mixing condition of the mini LED.

In other embodiments, the light emitting device 2 is not limited to a mini LED, and the light emitting device 2 may also be selected from at least one of an OLED, an LED, and a QD, for example, the backlight module may adopt a white LED integrally packaged by an RGB three-color LED, the blue LED chip excites a yellow phosphor to emit white light, the RGB three-color LED generates white light through color mixing, and the like.

In the above embodiment, the fluorescent film 3 covers the plurality of light emitting devices 2 on the substrate 1 over the whole surface, and the fluorescent film 3 is formed in a manner of covering over the whole surface, so that the consistency between the fluorescent film 3 at the joint and the plurality of substrates 1 can be ensured; the medium of the fluorescent film 3 has better uniformity on the whole surface, so that the plurality of light-emitting devices 2 are ensured to be uniformly conducted in the fluorescent film 3 after light is emitted; the fluorescent film 3 is made of any one of transparent optical cement (OCA cement for short), fluorescent powder or quantum dot protective film.

In the above embodiment, the backlight module further includes, but is not limited to, other optical films besides the diffusion film 4, for example, the backlight module further includes a prism film, and the prism film is disposed on a side of the diffusion film 4 away from the back plate.

The present invention also provides a display device, including: the display panel comprises a first substrate, a second substrate and a liquid crystal layer arranged between the first substrate and the second substrate; the backlight module is arranged below the display panel and comprises a back plate, a substrate 1, a plurality of light emitting devices 2 arranged on the substrate 1, a fluorescent film 3, a diffusion film 4 and a prism film which are sequentially arranged.

The backlight module and the display device provided by the embodiment of the application, the backlight module comprises at least one substrate 1 and at least one light compensation area, a plurality of mini LEDs are arranged on the substrate 1, a first surface 12 is arranged on one side of the substrate 1, which is far away from a back plate, the substrate 1 is provided with a central area 10 and at least one edge area 11 surrounding the central area 10, the substrate 1 is provided with a continuous first surface 12, and the first surface 12 extends from the central area 10 to the edge area 11; in the edge region 11, the first surface 12 further includes an extending surface 13, the extending surface 13 is a surface formed by the first surface 12 deviating from the central region 10 in the edge region 11, and the thickness of the substrate 1 in the edge region 11 is smaller than the thickness of the substrate 1 in the central region 10; alternatively, the substrate 1 further has a continuous second surface 15, the second surface 15 is disposed opposite to the first surface 12, wherein the extension surface 13 extends in a direction from the central region 10 to the edge region 11, and the extension surface 13 extends to form an included angle with the second surface 15; the extension plane 13 is preferably a slanted plane; the extension surface 13 conducts the light source of the mini LED to the diffusion film 4 of the light compensation area, so that the dark line of the light compensation area is reinforced, the transition is smooth, and the brightness of the whole surface is more uniform.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The backlight module and the display device provided by the embodiment of the present application are described in detail above, and a specific example is applied to illustrate the principle and the implementation manner of the present application, and the description of the embodiment is only used to help understanding the technical scheme and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims (10)

1. A backlight module is characterized in that the backlight module comprises:

the substrate is provided with a central area and at least one edge area surrounding the central area, the substrate is further provided with a continuous first surface, the first surface extends from the central area to the edge area, and in the edge area, the first surface further comprises an extending surface, and the extending surface is a surface formed by deviating the first surface from the central area in the edge area.

2. The backlight module of claim 1, wherein the thickness of the substrate in the edge region is less than the thickness of the substrate in the central region.

3. The backlight module as claimed in claim 1, wherein the substrate further has a continuous second surface opposite to the first surface, and wherein the extension surface extends to form an included angle with the second surface during the extension from the central region to the edge region.

4. The backlight module as claimed in claim 3, wherein the extending surface is an inclined surface.

5. The backlight module as claimed in claim 4, wherein the backlight module further comprises a fluorescent film disposed on the light emitting device and covering the light emitting device and the substrate entirely.

6. The backlight module as claimed in claim 5, wherein the backlight module further comprises a diffusion film disposed on a side of the phosphor film opposite to the substrate.

7. The backlight module of claim 6, further comprising a prismatic film disposed on a side of the diffuser film facing away from the substrate.

8. The backlight module of claim 7, wherein the substrate is a glass substrate.

9. The backlight module of claim 8, wherein the light emitting devices are mini LEDs.

10. A display device comprising the backlight module according to claims 1 to 9, and further comprising a display panel, wherein the display panel comprises a first substrate, a second substrate, and a liquid crystal layer disposed between the first substrate and the second substrate.

Images