CN218181270U

CN218181270U - Backlight module and liquid crystal display device

Info

Publication number: CN218181270U
Application number: CN202221991866.XU
Authority: CN
Inventors: 罗菲; 康报虹
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-12-30
Anticipated expiration: 2032-07-28

Abstract

The application relates to a backlight module and a liquid crystal display device. The backlight module comprises: the light guide plate comprises a backlight plate, a light bar, a rubber frame and a light guide plate, wherein the rubber frame is enclosed in the periphery of the backlight plate to form a cavity, the light bar and the light guide plate are arranged in the cavity, the light bar is positioned on one side of the light guide plate, the rubber frame comprises a rubber frame main body and at least one limiting portion, each limiting portion and the light bar are positioned on different sides of the light guide plate, each limiting portion is formed by extending the inner walls of the rubber frame main body towards the cavity, and the limiting portion and at least one side end face of the light guide plate are arranged oppositely. This application cancels the rubber strip of light guide plate spacing fixed through above-mentioned mode, and directly adopts the mode that forms spacing portion on the gluey frame, material saving cost, production cost of labor, be applicable to automated production, promote production efficiency.

Description

Backlight module and liquid crystal display device

Technical Field

The present disclosure relates to display technologies, and particularly to a backlight module and a liquid crystal display device.

Background

The liquid crystal display is developed in the direction of super-frameless and super-narrow frames, and the width of the frames of the liquid crystal display is developed to 4mm. For the liquid crystal display, the light guide plate is usually limited by sticking a buffer rubber strip on the backlight plate, so as to prevent the light guide plate from shaking in the liquid crystal display to cause scraping among optical components.

However, with the development of industry 4.0, the trend of liquid crystal module production is to perform automatic production, and the method of sticking the cushion rubber strip is not suitable for automatic production, and the cost is high when manual sticking is performed.

SUMMERY OF THE UTILITY MODEL

The application aims at providing a backlight module and a liquid crystal display device, which can be suitable for automatic production and reduce production cost.

In a first aspect, an embodiment of the present application provides a backlight module, including: the light guide plate comprises a backlight plate, a light bar, a rubber frame and a light guide plate, wherein the rubber frame is enclosed in the periphery of the backlight plate to form a cavity, the light bar and the light guide plate are arranged in the cavity, the light bar is positioned on one side of the light guide plate, the rubber frame comprises a rubber frame main body and at least one limiting portion, each limiting portion and the light bar are positioned on different sides of the light guide plate, each limiting portion is formed by extending the inner walls of the rubber frame main body towards the cavity, and the limiting portion and at least one side end face of the light guide plate are arranged oppositely.

In one embodiment of the present application, a front projection shape of the light guide plate on the backlight plate is a rectangle, and each of the limiting portions is disposed opposite to the other three side end surfaces of the light guide plate.

In one implementation of the present application, two spacing portions are disposed on the other three side end surfaces of the light guide plate in an opposite manner.

In one implementation of the present application, the height of each limiting portion along the first direction is smaller than the height of the rubber frame main body along the first direction.

In one implementation of this application, glue at least one lateral wall of frame main part and its corresponding be equipped with the breach between the spacing portion.

In one implementation of the present application, at least one side wall of the rubber frame main body corresponds to the limiting portion, and the notches are respectively arranged on two sides of the limiting portion along the first direction.

In one implementation of this application, the outer wall of spacing portion is in the orthographic projection of board in a poor light is first projection portion, it is in to glue the frame main part the orthographic projection of board in a poor light is second projection portion, and part first projection portion falls into in the second projection portion.

In one implementation of this application, the outer wall of spacing portion for spacing portion the outer wall orientation of gluey frame main part the direction slope of light guide plate sets up.

In one implementation of the present application, the backlight panel includes: a backlight plate main body; the enclosing baffle is enclosed at the periphery of the backlight plate main body, the rubber frame main body is enclosed at the periphery of the enclosing baffle, and the side wall of the enclosing baffle is provided with a notch matched with the limiting part.

In a second aspect, an embodiment of the present application further provides a liquid crystal display device, including: a liquid crystal display panel; and the backlight module of any one of the first aspect, the backlight module is disposed at a backlight side of the liquid crystal display panel, and the backlight module is configured to provide a light source to the liquid crystal display panel.

According to the embodiment of the application, a backlight module comprises: the backlight module comprises a backlight plate, a lamp strip, a rubber frame and a light guide plate, wherein the rubber frame surrounds the periphery of the backlight plate to form a cavity, the lamp strip and the light guide plate are arranged in the cavity, the lamp strip is positioned on one side of the light guide plate, the rubber frame comprises a rubber frame main body and at least one limiting part, the limiting parts and the lamp strip are positioned on different sides of the light guide plate, each limiting part is formed by extending each inner wall of the rubber frame main body towards the inside of the cavity, and the limiting parts are arranged opposite to at least one side end face of the light guide plate; compared with the prior art, the backlight module that this application embodiment provided forms spacing portion through extending at gluey frame main part inner wall, need not the material cost and the attached cost of labor of spacing rubber strip, has reduced manufacturing cost to promote production efficiency, be applicable to automated production.

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 given like reference numerals. The drawings are not necessarily to scale, they are merely intended to illustrate the relative positions of the layers, and the thicknesses of some portions are exaggerated for ease of understanding, and the thicknesses in the drawings do not represent the proportional relationship of the actual thicknesses.

Fig. 1 is a schematic structural diagram of a liquid crystal display device provided in an embodiment of the present application;

fig. 2 is a cross-sectional view of a liquid crystal display device provided in an embodiment of the present application;

fig. 3 is a top view illustrating a backlight module according to an embodiment of the disclosure;

fig. 4 is a top view of a backlight module according to an embodiment of the present application;

fig. 5 is an exploded view of a liquid crystal display device according to an embodiment of the present application;

fig. 6 is a cross-sectional view showing an exploded view of a liquid crystal display device provided in an embodiment of the present application;

FIG. 7 is a side view of a limiting part of the rubber frame based on FIGS. 5-6;

fig. 8 is a perspective view of a limiting part of the rubber frame based on fig. 5-6;

fig. 9 is a schematic view showing a layered structure of a liquid crystal display device provided in an embodiment of the present application.

Description of reference numerals:

100. a backlight module; 10. a backlight plate; 11. a backlight plate main body; 12. a surrounding baffle plate; 13. opening; 20. a rubber frame; 21. a rubber frame main body; 22. a limiting part; 23. a notch; 30. a light guide plate; 40. a light bar; 50. a reflective sheet; 60. an optical film set;

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

300. soaking cotton glue;

A. a first direction.

Detailed Description

Features of various aspects of the present application and exemplary embodiments will be 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 illustrating examples thereof. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail 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.

The display device generally includes a display panel and a backlight module, wherein the display panel is a non-emissive light receiving element, the backlight module is disposed on a side of a backlight surface of the display panel and is used for providing a light source for the display panel to enable the display panel to display an image, and the display panel is taken as a liquid crystal display panel, and the display device is an example of a liquid crystal display device for description.

In the side-in type liquid crystal display device, the backlight module comprises a backlight plate, a rubber frame, a reflector plate, a light guide plate, a light bar and an optical module group, wherein the backlight plate comprises a backlight plate main body and an enclosing baffle, the enclosing baffle is enclosed in the periphery of the backlight plate main body, the reflector plate is arranged on one side of the backlight plate main body, the light guide plate is arranged on one side of the reflector plate deviating from the backlight plate main body, the rubber frame comprises a rubber frame main body, the rubber frame main body is enclosed in the periphery of the backlight plate main body, the light bar is arranged on the backlight plate main body or the rubber frame main body, the light emergent side of the light bar is arranged opposite to one side of the light guide plate, the optical module group is arranged on one side of the backlight plate deviating from the light guide plate, and the rubber frame main body is used for connecting the optical module group.

For the liquid crystal display, the light guide plate is usually limited by sticking a buffer rubber strip on the backlight plate, so as to prevent the light guide plate from shaking in the liquid crystal display to cause scraping between optical film units. However, the automatic production is the trend of liquid crystal module production, and the method of sticking the cushion rubber strip is not suitable for the automatic production, and the cost is high when the manual sticking is adopted.

In view of this, embodiments of the present disclosure provide a backlight module 100 and a liquid crystal display device including the backlight module 100, the plastic frame 20 of the backlight module 100 further includes at least one limiting portion 22, each limiting portion 22 and the light bar 40 are located on different sides of the light guide plate 30, each limiting portion 22 is formed by extending each inner wall of the plastic frame main body 21 toward the cavity, and the limiting portion 22 is disposed opposite to at least one side end surface of the light guide plate 30. Through forming spacing portion 22 at the extension of gluey frame main part 21 inner wall, need not the material cost and the attached cost of labor of spacing rubber strip, reduced manufacturing cost to promote production efficiency, be applicable to automated production.

The following describes specific structures of the backlight module 100 and the liquid crystal display device including the backlight module 100 according to various embodiments of the present application, respectively, with reference to the drawings.

First embodiment

Referring to fig. 1-2, the backlight module 100 includes a backlight plate 10, a plastic frame 20, a reflector 50, a light guide plate 30, a light bar 40, and an optical module group 60.

The position-limiting portion 22 and at least one side end surface of the light guide plate 30 are disposed opposite to each other at a predetermined interval of 0-0.2mm, that is, the position-limiting portion 22 contacts with at least one side end surface of the light guide plate 30, or the position-limiting portion 22 and at least one side end surface of the light guide plate 30 have a gap smaller than 0.2mm, and both of the above two manners can limit the light guide plate 60 after expansion.

In some embodiments, as shown in fig. 3, a front projection shape of the light guide plate 30 on the backlight plate 10 is a rectangle, and each of the limiting portions 22 is disposed opposite to the other three side end surfaces of the light guide plate 30. That is, for the rectangular light guide plate 30, one side end surface of the light guide plate 30 is disposed opposite to the light bar 40, and the other three side end surfaces are disposed opposite to the position-limiting portions 22, and when the light guide plate 30 expands due to heat, the other three side end surfaces of the light guide plate 30 expand to different degrees, so that the position-limiting portions 22 are formed by extending the inner walls of the plastic frame main body 21 corresponding to the other three side end surfaces of the light guide plate 30 into the cavity, and the sides of the light guide plate 30 are better prevented from shaking in the liquid crystal display to cause scraping between the optical film sets 60.

In other embodiments, as shown in fig. 4, the front projection shape of the light guide plate 30 on the backlight 10 is a rectangle, and the position-limiting portion 22 is disposed on a lateral end surface of the light guide plate 30 facing away from the light bar 40. That is, for the rectangular light guide plate 30, one side end surface of the light guide plate 30 is disposed opposite to the light bar 40, and one side end surface of the light guide plate 30 facing away from the light bar 40 is disposed opposite to the limiting portion 22, when the light guide plate 30 expands due to heat, the other three side end surfaces of the light guide plate 30 all expand to different degrees, and the other side end surface of the light guide plate 30 along the light exit direction of the light bar 40 expands most significantly, so that the limiting portion 22 is formed by extending the inner wall of the rubber frame main body 21 corresponding to the other side end surface of the light guide plate 30 into the cavity, which can prevent the light guide plate 30 from expanding to cause scraping between the optical film sets 60, and further reduce the production cost.

On the basis of any of the above embodiments, please refer to fig. 3 to fig. 4, when the other three side end surfaces of the light guide plate 30 are provided with the position-limiting parts 22, the three inner walls of the rubber frame main body 21 corresponding to the other three side end surfaces of the light guide plate 30 are respectively provided with two position-limiting parts 22 distributed at intervals. When the limit parts 22 are oppositely arranged on one side end face of the light guide plate 30 departing from the light bar 40, two limit parts 22 distributed at intervals are arranged on the inner wall of the rubber frame main body 21 corresponding to the side end face of the light guide plate 30 departing from the light bar 40.

Therefore, the inner wall of the rubber frame main body 21 which needs to be provided with the limiting parts 22 is provided with two limiting parts 22 at intervals along the extending direction of each side wall to realize the expansion limitation of the light guide plate 30, and compared with the arrangement of one limiting part 22, the rubber frame main body can better limit the scraping among the optical film groups 60 caused by the expansion of the light guide plate 30 and better limit the narrow frame design of the liquid crystal display device; compared with the arrangement of a plurality of limiting parts 22, the production cost can be further reduced.

Further, as shown in fig. 3-4, each of the position-limiting portions 22 is disposed at a corner close to the rubber frame main body 21, so that a position for engaging with the baffle 12 of the backlight 10 is reserved at the middle position of the rubber frame main body 21, and the design of other structures of the rubber frame main body 21 is not affected.

In addition, the height of each limiting portion 22 along the first direction is smaller than the height of the rubber frame main body 21 along the first direction, and when the limiting portions 22 are extruded by the light guide plate 30 to move outwards, if the height of the connecting portion of the limiting portions 22 and the side wall of the rubber frame main body 21 is smaller, the limiting portions 22 are easily broken and cannot be deformed, so that the rubber frame 20 is damaged, and the product yield is affected.

Wherein, the first direction refers to the height direction of the liquid crystal display device.

Referring to fig. 5-7, in some embodiments, a gap 23 is formed between at least one side wall of the rubber frame main body 21 and the corresponding limiting portion 22. The notch 23 prevents the light guide plate 30 from expanding and extruding the limiting portion 22 to cause damage to the limiting portion 22 due to stress concentration, and on the other hand, prevents the light guide plate 30 from expanding and extruding the limiting portion 22 to cause arching of the outer wall of the rubber frame main body 21 to limit development of a narrow frame of the liquid crystal display device.

Furthermore, the notches 23 are respectively formed on at least one side wall of the rubber frame main body 21 and the corresponding limiting portion 22 along the two sides of the first direction. Moreover, the notch 23 extends to one side of the rubber frame main body 21 facing the backlight plate 10, so that the limiting part 22 can rotate within the range of 5-10 degrees along the side connected with the rubber frame main body 21, and the outer wall of the rubber frame main body 21 is better prevented from arching.

Referring to fig. 5, 6 and 8, in a further embodiment, a forward projection of the outer wall of the limiting portion 22 on the backlight board 10 is a first projection portion, a forward projection of the rubber frame main body 21 on the backlight board 10 is a second projection portion, and a part of the first projection portion falls into the second projection portion. That is, when the light guide plate 30 is heated and expanded, the limiting portion 22 is pushed, the limiting portion 22 moves outwards, the outer wall part of the limiting portion 22 is located in the outer wall of the rubber frame main body 21, the whole limiting portion 22 is located in the rubber frame main body 21, the appearance of the whole liquid crystal display device cannot be enlarged, and the narrow frame design of the liquid crystal display device is facilitated.

Specifically, the outer wall of the limiting portion 22 is inclined with respect to the limiting portion 22 in a direction toward the light guide plate 30 from the outer wall of the rubber frame body 21, the inclination angle is 1 ° to 3 °, and one side of the limiting portion 22 close to the backlight plate 10 is inward, and the light guide plate 30 is opposite to one side of the limiting portion 22 close to the backlight plate 10, so that the light guide plate 30 is expanded to move outward, but the side of the limiting portion 22 close to the backlight plate 10 is inclined inward, so that the appearance of the whole liquid crystal display device is not enlarged, and the narrow frame design of the liquid crystal display device is facilitated.

In other embodiments, the backlight panel 10 includes: a backlight plate body 11; the surrounding baffle 12 surrounds the periphery of the backlight plate main body 11, the rubber frame main body 21 surrounds the periphery of the surrounding baffle 12, the side wall of the surrounding baffle 12 is provided with a notch 13 matched with the limiting part 22, and the limiting part 22 is oppositely arranged in the notch 13, so that the assembly of the backlight plate 10 and the rubber frame 20 is facilitated.

As an example, the rubber frame main body 21 and the limiting member are integrally molded, the material of the rubber frame main body 21 and the limiting member is a deformable material with a buffering performance, specifically, expanded polypropylene (EPP), expanded Polyethylene (EPE), expanded Polystyrene (EPS), and the like, the material of the rubber frame main body 21 and the limiting member is not limited herein, and the rubber frame main body 21 and the limiting member made of the material with the buffering performance can better protect the optical diaphragm group 60 during assembly and use.

The light guide plate 30 is formed by printing light guide points on the bottom surface of an optical acrylic plate by using laser engraving, V-shaped cross grid engraving and UV screen printing techniques by using an optical acrylic/PC plate and then using a high-tech material with a very high refractive index and no light absorption, and is used for uniformly diffusing light emitted from the light bar 40.

The Light bar 40 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) with conventional sizes, or may be Micro-LEDs (Micro-LEDs) or submillimeter LEDs (Mini-LEDs). The Micro-LED refers to an LED chip with the grain size of less than 100 microns, and the Mini-LED refers to an LED chip with the grain size of 100-300 microns. The LED, the Mini-LED or the Micro-LED can be used as a self-luminous light emitting 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.

In other embodiments, the optical film set 60 includes a plurality of stacked optical films, and the optical films are fixedly connected by a transparent optical adhesive to prevent the optical films from being displaced relative to each other to affect the light-emitting effect of the backlight module 100.

Specifically, the optical film may be any one of a diffusion plate, a prism sheet, or a protective sheet, and the optical film group 60 includes a plurality of stacked diffusion plates, prism sheets, or protective sheets; alternatively, the optical film sheet may be at least two of a diffusion sheet, a prism sheet, or a protective sheet, and the optical film sheet set 60 includes at least two optical film sheets stacked together, such as a diffusion sheet and a prism sheet, a prism sheet and a protective sheet. The diffusion plate is used for diffusing the light emitted by the light bar 40 so as to balance the brightness of the whole backlight module 100; the prism sheet is used for controlling the propagation direction of the light diffused by the diffusion plate so that the propagation direction of the light is vertical to the display panel; the protective sheet serves to protect the prisms of the prism sheet from scratches and the like, and also serves to widen the viewing angle, which was previously narrowed by the prism sheet.

The reflector plate 50 specifically can adopt reflective paper, in the backlight unit 100 of formula of inclining into, paste a whole layer of reflective paper under the light guide plate 30, because lamp strip 40 with the light source launch the light guide plate 30 on, light takes place the deflection through the light guide plate 30, partial light is dispersed away towards liquid crystal display panel 200, partial light can get into the reflective paper, the reflective paper reflects light guide plate 30 back with absorptive partial light to launch away through liquid crystal display panel, thereby improve the light-emitting rate.

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

Second embodiment

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

The periphery of the liquid crystal display panel 200 may be directly adhered to the backlight module 100 by using a foam adhesive 300, the foam adhesive 300 is a double-sided adhesive tape, and the liquid crystal display panel 200 is made of liquid crystal glass.

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

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

It can be understood that the technical solution of the backlight module 100 provided In the embodiments of the present application can be widely applied 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, and MVA (Multi-Domain Vertical Alignment) display panels. It should be readily understood that "on 8230; \8230on", "on 8230;," on 82308230; \823030jaabove "and" on 8230; \8230on "in this application should be interpreted in the broadest manner so that" on 8230on "not only means" directly on something "but also includes the meaning of" on something "with intermediate features or layers in between, and" above 8230or "above 8230" \8230 "; not only includes the meaning of" above something "or" above "but also includes the meaning of" above something "or" above "with no intervening features or layers therebetween (i.e., directly on something).

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions 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 solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A backlight module comprises a backlight plate, a lamp strip, a rubber frame and a light guide plate, wherein the rubber frame surrounds the periphery of the backlight plate to form a cavity, the lamp strip and the light guide plate are arranged in the cavity, the lamp strip is positioned at one side of the light guide plate, and the backlight module is characterized in that,

the rubber frame comprises a rubber frame main body and at least one limiting part, each limiting part and the lamp strip are located on different sides of the light guide plate, each limiting part is formed by extending each inner wall of the rubber frame main body towards the cavity, and the limiting parts are arranged opposite to at least one side end face of the light guide plate.

2. The backlight module according to claim 1, wherein the light guide plate has a rectangular front projection, and the position-limiting portions are disposed opposite to the other three side end surfaces of the light guide plate.

3. The backlight module according to claim 2, wherein two spacing portions are disposed on the other three side faces of the light guide plate.

4. The backlight module according to claim 1, wherein the height of each position-limiting portion along the first direction is less than the height of the plastic frame main body along the first direction.

5. The backlight module as claimed in claim 1, wherein a gap is formed between at least one sidewall of the plastic frame body and the corresponding limiting portion.

6. The backlight module according to claim 5, wherein the at least one sidewall of the plastic frame body and the corresponding limiting portion are respectively provided with the notch along two sides of the first direction.

7. The backlight module as claimed in claim 1, wherein the outer wall of the position-limiting portion is a first projection portion in the front projection of the backlight plate, the main body of the adhesive frame is a second projection portion in the front projection of the backlight plate, and a part of the first projection portion falls into the second projection portion.

8. The backlight module according to claim 7, wherein the outer wall of the position-limiting portion is disposed obliquely with respect to the outer wall of the rubber frame main body toward the light guide plate.

9. The backlight module according to claim 1, wherein the backlight plate comprises:

a backlight plate main body; and (c) a second step of,

the side wall of the enclosing baffle is provided with an opening matched with the limiting part.

10. A liquid crystal display device, comprising:

a liquid crystal display panel; and

the backlight module according to any of claims 1-9, disposed on a backlight side of the liquid crystal display panel, the backlight module configured to provide a light source to the liquid crystal display panel.