CN114924439A

CN114924439A - Backlight module and display panel

Info

Publication number: CN114924439A
Application number: CN202210260769.1A
Authority: CN
Inventors: 吕界; 康报虹
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-08-19

Abstract

The application discloses a backlight module and a display panel, wherein the backlight module comprises a light guide plate, a fixing piece and a light bar; the side surface of the light guide plate comprises a light incident surface; the fixing piece comprises a body and a convex part arranged on the body; the body is arranged on one side of the light incident surface of the light guide plate and is arranged at intervals with the light incident surface; the light bar is arranged on the body and is arranged at intervals with the light incident surface; along the length direction of the light bar, the length of the bulge part is smaller than that of the body; the protruding part contacts with the end part of the light guide plate close to the lamp strip, and the lamp strip and the fixing part displace along with the expansion or contraction of the light guide plate, so that the distance between the light strip and the light incoming surface of the light guide plate is kept, the undersize distance between the light strip and the light incoming surface of the light guide plate caused by the expansion of the light guide plate can be avoided, and the lamp strip is prevented from being extruded.

Description

Backlight module and display panel

Technical Field

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

Background

The backlight is divided into a direct type and a side type. Because the requirement of modern society on the lightness and thinness of the display is higher and higher, the thickness of the display formed by the side-in type backlight is thinner than that of the display formed by the direct type backlight, and therefore, the side-in type backlight has better development prospect.

In the prior art, in the side-in type backlight module, the light bar is designed on the side wall of the back plate on the side surface of the light guide plate and is arranged at intervals with the light incident surface of the light guide plate. The LED backlight module is characterized in that a plurality of LEDs are arranged on the light bar, and the closer the distance between the LED light-emitting surface and the light-entering surface of the light guide plate is, the better the backlight display effect is. However, in an actual process, the distance between the LED light emitting surface and the light incident surface of the light guide plate is often designed to be large, because the temperature inside the backlight module rises due to heat generated during operation of the backlight module, the end of the light guide plate close to the LED light emitting surface expands due to heating, and if the distance is too small, the LED may contact with the expanded light guide plate or even be extruded, thereby causing damage to the LED. Therefore, how to reduce the distance between the light emitting surface of the LED and the light incident surface of the light guide plate without damaging the LED is a problem worthy of research.

Disclosure of Invention

The application provides a backlight unit and display panel solves among the prior art how to reduce the technical problem that the distance between LED play plain noodles and the light guide plate income plain noodles is not gone into under the prerequisite that causes LED to damage.

In order to solve the above technical problem, a first technical solution provided by the present application is: the backlight module comprises a light guide plate, a fixing piece and a light bar; the side surface of the light guide plate comprises a light incident surface; the fixing piece comprises a body and a bulge part arranged on the body; the body is arranged on one side of the light incident surface of the light guide plate and is arranged at intervals with the light incident surface; the light bar is arranged on the body and is arranged at intervals with the light incident surface; the length of the protruding part is smaller than that of the light guide plate along the length direction of the light bar; the protruding portion is in contact with the end portion, close to the light bar, of the light guide plate, and the light bar and the fixing piece displace together along with expansion or contraction of the light guide plate so as to keep the distance between the light bar and the light incident surface of the light guide plate.

The light bar is arranged on the surface of the body close to the light guide plate, and comprises a printed circuit board and a plurality of light-emitting devices arranged on the printed circuit board; the fixing piece comprises a plurality of protruding parts which are arranged at intervals along the length direction of the body; the projection of the plurality of the convex parts on the lamp strip is arranged in a staggered mode with the plurality of the light-emitting devices, a first opening is formed in the position, corresponding to the convex parts, of the printed circuit board, and the convex parts penetrate through the first opening and are in contact with the end portion, close to the lamp strip, of the light guide plate.

The LED lamp also comprises a back plate, wherein the back plate comprises a side wall and a bottom wall which are connected with each other; the bottom wall of the back plate is arranged on one side of the light guide plate, which is far away from the light emergent surface, and the side wall of the back plate is arranged on one side of the body, which is far away from the light incident surface of the light guide plate; the protruding part is fixedly connected with the end part, close to the lamp strip, of the light guide plate, so that the fixing part moves relative to the bottom wall of the back plate along with expansion or contraction of the light guide plate.

Wherein, the inner surface of the back plate is provided with a plurality of sliding rails or sliding chutes at intervals; the body is provided with a second opening matched with the sliding rail or a sliding block matched with the sliding groove, so that the fixing piece slides along the sliding rail or the sliding groove along with the expansion or contraction of the light guide plate.

The inner surface of the back plate is provided with a plurality of spaced sliding rails, and the body is provided with a second opening matched with the sliding rails; the slide rails are respectively connected with the side wall and the bottom wall of the back plate; the convex part is connected with a common side wall between two adjacent second openings; the side wall of the sliding rail, which is matched with the two adjacent second openings, is provided with a limiting flange, the limiting flange is positioned between the protruding part and the bottom wall of the second opening, and the protruding part is positioned between the limiting flange and the bottom wall of the back plate.

The inner surface of the back plate is provided with a plurality of spaced sliding rails, and the body is provided with a groove matched with the sliding rails; the fixing piece is arranged in a suspended mode through the sliding rail and is arranged at intervals with the bottom wall of the back plate.

The LED lamp also comprises a back plate, wherein the back plate comprises a side wall and a bottom wall which are connected with each other; the bottom wall of the back plate is arranged on one side, away from the light emitting surface, of the light guide plate, and the body is arranged between the light incident surface of the light guide plate and the side wall of the back plate; the body is connected with the side wall of the back plate through an elastic piece, and the protruding portion is abutted to the end portion, close to the light bar, of the light guide plate, so that the fixing piece moves relative to the bottom wall of the back plate along with expansion or contraction of the light guide plate.

The fixing piece and the bottom wall of the back plate are arranged at intervals.

The light guide plate comprises a plate body and a boss; the plate body is provided with a light emergent surface; the boss is arranged on the surface of the plate body opposite to the light emergent surface, and the boss is positioned at the end part of the plate body close to the light bar; the boss is in contact with the boss; the projection of the lamp strip on the light guide plate is located in the light incident surface.

In order to solve the above technical problem, a second technical solution provided by the present application is: a display panel comprises a display module and a backlight module; the display module is used for displaying images; the backlight module is used for providing a light source for the display module; the backlight module is any one of the backlight modules.

The beneficial effect of this application: different from the prior art, the application discloses a backlight module and a display panel, wherein the backlight module comprises a light guide plate, a fixing piece and a light bar; the side surface of the light guide plate comprises a light incident surface; the fixing piece comprises a body and a bulge part arranged on the body; the body is arranged on one side of the light incident surface of the light guide plate and is arranged at intervals with the light incident surface; the light bar is arranged on the body and is arranged at intervals with the light incident surface; along the length direction of the light bar, the length of the bulge part is smaller than that of the body; the protruding part is close to the tip contact of lamp strip with the light guide plate, and the lamp strip takes place the displacement along with the inflation or the shrink of light guide plate together with the mounting to keep the distance between the income plain noodles of lamp strip and light guide plate, can avoid the inflation of light guide plate and the distance between the income plain noodles of lamp strip and light guide plate that causes diminishes, and then avoid the lamp strip to receive the extrusion, under this prerequisite, can be as little as possible with the distance setting between the income plain noodles of lamp strip and light guide plate, do benefit to the efficiency that promotes being shaded.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present application;

fig. 2 is a schematic top view of the light bar, the fixing member and the light guide plate in the backlight module shown in fig. 1;

FIG. 3 is an exploded view of the light bar, the fixing member and the back plate of the backlight module shown in FIG. 1;

fig. 4 is a schematic view of an assembly structure of the light bar, the fixing member and the back plate in the backlight module shown in fig. 1;

FIG. 5a is a schematic view of a light guide plate of the backlight module shown in FIG. 1 according to a first embodiment;

FIG. 5b is a schematic view of a second embodiment of a light guide plate in the backlight module shown in FIG. 1;

fig. 6 is a schematic structural diagram of a backlight module according to a second embodiment of the present application;

fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the present application.

Reference numerals:

1-backlight module, 11-light guide plate, 111-plate body, 1111-first surface, 1112-second surface, 1113-side surface, 112-boss, 12-fixing piece, 121-body, 1211-second opening, 122-bulge, 13-lamp strip, 131-printed circuit board, 1311-first opening, 132-light-emitting element, 14-backboard, 141-side wall, 142-bottom wall, 143-slide rail, 1431-limit flange, 15-silica gel pad, 16-reflection sheet, 17-reflection adhesive tape, 18-rubber frame, 181-first part, 182-second part, 19-optical film, 20-elastic piece, 2-display module, 21-liquid crystal panel, 22-foam adhesive, 3-front frame, 31-third part, 32-fourth part.

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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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 following description, for purposes of explanation rather than limitation, specific details are set forth such as the particular system architecture, interfaces, techniques, etc., in order to provide a thorough understanding of the present application.

The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, features defined as "first", "second", and "third" may explicitly or implicitly include at least one of the described features. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. All directional indications (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly. The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The present application will be described in detail with reference to the accompanying drawings and examples.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present disclosure.

The backlight module 1 includes a light guide plate 11, a fixing member 12, and a light bar 13. The side surface of the light guide plate 11 includes a light incident surface a. The fixing member 12 includes a body 121 and a protrusion 122 disposed on the body 121, wherein the body 121 is disposed on one side of the light incident surface a of the light guide plate 11 and spaced apart from the light incident surface a of the light guide plate 11. The light bar 13 is disposed on the body 121 and spaced apart from the light incident surface a of the light guide plate 11. The protrusion 122 contacts an end of the light guide plate 11 close to the light bar 13, and the light bar 13 and the fixing member 12 displace together with the expansion or contraction of the light guide plate 11 to maintain a distance between the light bar 13 and the light incident surface a of the light guide plate 11.

Preferably, the length of the protrusion 122 is smaller than the length of the light guide plate 11 along the length direction of the light bar 13. Because the protruding part 122 contacts with the end part of the light guide plate 11 close to the light bar 13, the length of the protruding part 122 is set to be smaller than the length of the light guide plate 11, so that the contact area between the protruding part 122 and the light guide plate 11 can be reduced, the heat generated by the light emission of the light bar 13 is favorably reduced, and the heat expansion of the light guide plate 11 is reduced to a certain extent through the body 121 and the heat conducted to the light guide plate 11 by the protruding part 122. Even if the light guide plate 11 is heated to expand, the protrusion 122 contacts with the end portion of the light guide plate 11 close to the light bar 13, and the protrusion 122 may displace along with the expansion or contraction of the light guide plate 11, because the protrusion 122 is connected to the body 121, the light bar 13 fixed to the body 121 and the protrusion 122 displace along with the expansion or contraction of the light guide plate 11, so that the distance between the light bar 13 and the light incident surface a of the light guide plate 11 is maintained, the distance between the light bar 13 and the light incident surface a of the light guide plate 11 caused by the expansion of the light guide plate 11 is prevented from decreasing, and further, the light bar 13 is prevented from being squeezed. On this basis, the distance between the light bar 13 and the light incident surface a of the light guide plate 11 can be set as small as possible, so as to improve the backlight efficiency.

With continued reference to fig. 1, the backlight module 1 further comprises a back plate 14, and the back plate 14 comprises a sidewall 141 and a bottom wall 142 connected to each other. The bottom wall 142 of the back plate 14 is disposed on a side of the light guide plate 11 away from the light emitting surface b, and the side wall 141 of the back plate 14 is disposed on a side of the body 121 of the fixing member 12 away from the light incident surface a of the light guide plate 11. Optionally, the side wall 141 of the back plate 14 is perpendicular to the bottom wall 142 of the back plate 14, and the body 121 of the fixing member 12 is perpendicular to the protrusion 122 of the fixing member 12, so as to facilitate processing. It is understood that the side wall 141 of the back plate 14 and the bottom wall 142 of the back plate 14 can form a non-perpendicular included angle, and the degree of the included angle is designed according to specific needs, for example, the included angle can be 80 degrees to 90 degrees. The body 121 of the fixing member 12 and the protrusion 122 of the fixing member 12 may form a non-perpendicular angle therebetween, for example, the angle may be 80 degrees to 90 degrees. The included angle does not allow the protrusion 122 to block the light emitted from the light bar 13, and does not affect the movement of the light bar 13 and the fixing member 12 together with the expansion of the light guide plate 11.

Referring to fig. 2 to 5b, fig. 2 is a schematic top view structure diagram of a light bar, a fixing member and a light guide plate in the backlight module provided in fig. 1, fig. 3 is a schematic exploded structure diagram of the light bar, the fixing member and a back plate in the backlight module provided in fig. 1, fig. 4 is a schematic assembly structure diagram of the light bar, the fixing member and the back plate in the backlight module provided in fig. 1, fig. 5a is a schematic structure diagram of a first embodiment of the light guide plate in the backlight module provided in fig. 1, and fig. 5b is a schematic structure diagram of a second embodiment of the light guide plate in the backlight module provided in fig. 1.

The light bar 13 comprises a printed circuit board 131 and a plurality of light emitting elements 132 arranged on the printed circuit board 131; optionally, the light emitting element 132 is a light emitting diode LED, such as a micro LED or a MiniLED. The light bar 13 is spaced apart from the light incident surface a of the light guide plate 11, so that light emitted from the light emitting elements 132 of the light bar 13 is emitted to the light incident surface a of the light guide plate 11 and then emitted from the light emitting surface b of the light guide plate 11. The length of the light guide plate 11 is greater than or equal to that of the light bar 13, so that light emitted by the light bar 13 is guided to the light emitting surface b of the light guide plate 11, and the backlight efficiency is improved; optionally, the length of the light guide plate 11 is equal to the length of the light bar 13. The length of the body 121 can be greater than, less than or equal to the length of the light bar 13, and the light bar 13 can be fixed on the body 121; optionally, the length of the body 121 is the same as the length of the light bar 13.

In the present embodiment, the light bar 13 is disposed on the surface of the body 121 close to the light guide plate 11 (as shown in fig. 2). In other embodiments, the light bar 13 may be disposed on a surface of the body 121 away from the light guide plate 11, in which case, an opening or a light-transmitting portion needs to be disposed at a position of the body 121 corresponding to the light-emitting element 132 of the light bar 13, or the body 121 is made of a light-transmitting material, so that light emitted by the light-emitting element 132 of the light bar 13 can be incident on the light incident surface a of the light guide plate 11. It can be understood that the specific arrangement mode of the relative position of the light bar 13 and the body 121 can be designed according to the requirement.

The projection 122 may be one or more.

In the first embodiment, the fixing member 12 includes a plurality of protrusions 122 (shown in fig. 2) spaced apart along the length direction of the body 121, that is, the length of the protrusions 122 is smaller than the length of the body 121; through making mounting 12 include a plurality of bellying 122, guaranteeing that bellying 122 and light guide plate 11 are close to the tip contact stability of lamp strip 13 to when guaranteeing that bellying 122 can take place the displacement along with the inflation of light guide plate 11, reduced the area of contact of bellying 122 with light guide plate 11, do benefit to and avoid light guide plate 11 to be heated and expand. The projections of the plurality of protrusions 122 on the light bar 13 are disposed in a staggered manner with respect to the plurality of light emitting elements 132, the printed circuit board 131 has a first opening 1311 at a position corresponding to the protrusion 122, and the protrusion 122 passes through the first opening 1311 and contacts with an end of the light guide plate 11 close to the light bar 13 (as shown in fig. 3). The number of the protrusions 122 may be set according to the length of the light bar 13. Optionally, the first opening 1311 is a notch disposed on the edge of the circuit board 131 close to the bottom wall 142 of the back plate 14.

In the second embodiment, the fixing member 12 may include only one protrusion 122, and the length of the protrusion 122 is smaller than the length of the light guide plate 11, so that the contact area between the protrusion 122 and the light guide plate 11 may be reduced. It will be appreciated that the specific arrangement of the projections 122 may be designed as desired.

Referring to fig. 5a-5b, the light guide plate 11 includes a plate body 111 and a boss 112, the plate body 111 includes a first surface 1111 and a second surface 1112 disposed opposite to each other, and a lateral surface 1113 connecting the first surface 1111 and the second surface 1112, the lateral surface 1113 of the plate body 111 is a light incident surface a, and the first surface 1111 of the plate body 111 is a light emergent surface b; that is, the plate 111 has a light incident surface a and a light emitting surface b. The boss 112 is disposed on the surface of the plate body 111 opposite to the light-emitting surface b; that is, the boss 112 is provided on the second surface 1112 of the plate body 111. The boss 112 is disposed at the end of the plate 111 near the light bar 13, and the protrusion 122 of the fixing member 12 contacts the boss 112. Optionally, the fixing member 12 is made of a material with excellent thermal expansion performance, so that the fixing member 12 is prevented from expanding due to heat generated by light emission of the light bar 13, and the distance between the light bar 13 and the light incident surface a of the light guide plate 11 is favorably maintained.

In the first embodiment of the light guide plate 11, the surface of the boss 112 close to the light bar 13 is flush with the side surface 1113 of the plate body 111 (as shown in fig. 5 a). In the second embodiment of the light guide plate 11, the distance between the surface of the boss 112 close to the light bar 13 and the light bar 13 is greater than the distance between the side surface 1113 of the plate body 111 and the light bar 13 (as shown in fig. 5 b). It is understood that the position of the boss 112 on the plate body 111 is designed according to the requirement.

Optionally, the protrusion 122 of the fixing member 12 contacts the surface of the boss 112 close to the light bar 13 (as shown in fig. 1), so as to facilitate the fixing member 12 to displace along with the expansion or contraction of the light guide plate 11. Preferably, the protrusion 122 of the fixing member 12 contacts only the surface of the boss 112 close to the light bar 13, so as to reduce the contact area between the fixing member 12 and the light guide plate 11.

It should be noted that when the surface of the boss 112 close to the light bar 13 is flush with the side surface 1113 of the plate body 111, the surface of the boss 112 close to the light bar 13 and the side surface 1113 of the plate body 111 are light incident surfaces a of the light guide plate 11; when the distance between the surface of the boss 112 close to the light bar 13 and the light bar 13 is greater than the distance between the side surface 1113 of the plate body 111 and the light bar 13, the side surface 1113 of the plate body 111 is the light incident surface a of the light guide plate 11. The projection of the light bar 13 on the light guide plate 11 is located in the light incident surface a of the light guide plate 11, so that the light emitted by the light bar 13 is emitted to the light guide plate 11; preferably, the projection of the light bar 13 on the light guide plate 11 is located in the side surface 1113 of the plate body 111.

In the present embodiment, the protrusion 122 is fixedly connected to the end of the light guide plate 11 close to the light bar 13, so that the fixing member 12 can move relative to the bottom wall 142 of the back plate 14 along with the expansion or contraction of the light guide plate 11. Wherein, the tip that bellying 122 and light guide plate 11 are close to lamp strip 13 can realize fixed connection through the heat dissipation double faced adhesive tape, also can realize fixed connection through buckle structure, specifically designs as required, and this application is not restricted to this. That is, the protruding portion 122 and the protruding platform 112 are fixedly connected by a heat dissipation double-sided tape, a snap structure, or the like.

Referring to fig. 3, a plurality of spaced slide rails 143 are disposed on the inner surface of the back plate 14, and the slide rails 143 are connected to the side walls 141 and/or the bottom wall 142 of the back plate 14; the body 121 has a second opening 1211 engaged with the slide rail 143 so that the fixing member 12 slides along the slide rail 143 as the light guide plate 11 expands or contracts. By arranging the slide rail 143 on the back plate 14, the fixing member 12 slides along the slide rail 143, which is beneficial to reducing the friction force when the fixing member 12 displaces relative to the bottom wall 142 of the back plate 14, so that the fixing member 12 is easily driven to move together when the light guide plate 11 expands or contracts.

Optionally, a plurality of spaced slide rails 143 are disposed on the bottom wall 142 of the back plate 14, the body 121 has a second opening 1211 engaged with the slide rails 143, and the slide rails 143 are connected to the side walls 141 of the back plate 14. The side walls of the slide rails 143, which are fitted with the adjacent two second openings 1211, have limit flanges 1431, and specifically, the two sides of the two slide rails 143 facing each other have the limit flanges 1431. The convex portion 122 is connected to a common sidewall between the adjacent two second openings 1211. When the fixing member 12, the light bar 13 and the back panel 14 are assembled as shown in fig. 4, the position-limiting flange 1431 is located between the protruding portion 122 and the bottom wall of the second opening 1211, and the protruding portion 122 is located between the position-limiting flange 1431 and the bottom wall 142 of the back panel 14.

Optionally, a plurality of spaced slide rails 143 are disposed on the bottom wall 142 of the back plate 14, the slide rails 143 are connected to the side walls 141 of the back plate 14, and the body 121 has a groove (not shown) matching with the slide rails 143; the fixing member 12 is suspended by the sliding rail 143 to be spaced from the bottom wall 142 of the back plate 14, so that the friction force generated when the fixing member 12 displaces relative to the bottom wall 142 of the back plate 14 is further reduced, and the fixing member 12 is more easily driven to move together when the light guide plate 11 expands or contracts.

In other embodiments, a plurality of spaced runners are provided on the inner surface of the bottom wall 142 of the back plate 14; the body 121 has a slider engaged with the sliding groove so that the fixing member 12 slides along the sliding groove as the light guide plate 11 expands or contracts. For example, the projection 122 may be used as the slider, or a slider that engages with a slide groove may be provided on the body 121.

With reference to fig. 1, the backlight module 1 further includes a silicone pad 15, a reflective sheet 16, a reflective tape 17, a rubber frame 18, and an optical film 19.

A reflecting sheet 16 and a silica gel pad 15 are sequentially arranged between the plate body 111 of the light guide plate 11 and the bottom wall 142 of the back plate 14; the reflector plate 16 is close to the end face of the light bar 13 and contacts with the boss 112 of the light guide plate, and the silica gel pad 15 is close to the end face of the light bar 13 and is arranged at an interval with the boss 112 of the light guide plate 11. The surface of the plate body 111 of the light guide plate 11 away from the bottom wall 142 of the back plate 14 is provided with an optical film 19. The plastic frame 18 includes a first portion 181 and a second portion 182 connected to each other, the first portion 181 is disposed on a side of the side wall 141 of the back plate 14 away from the light bar 13, and the second portion 182 is disposed on a side of the light bar 13 away from the bottom wall 142 of the back plate 14. The surface of the second portion 182 of the adhesive frame 18 close to the light guide plate 11 is provided with a reflective adhesive tape 17, and the reflective adhesive tape 17 is located above the end portion of the light guide plate 11 close to the light bar 13, so that the light emitted from the light bar 13 enters the light guide plate 11 as much as possible. The functions of the silica gel pad 15, the reflector 16, the reflective tape 17, the rubber frame 18, and the optical film 19 are the same as those in the prior art, and are not described again.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a backlight module according to a second embodiment of the present application.

The structure of the backlight module provided in fig. 6 is substantially the same as that of the backlight module provided in fig. 1, except that: the manner of relative movement between the anchor 12 and the backing plate 14 is different and the same parts will not be described again.

In the embodiment, the body 121 is connected to the side wall 141 of the back plate 14 through the elastic member 20, and the protrusion portion 122 abuts against an end of the light guide plate 11 close to the light bar 13, so that the fixing member 12 moves relative to the bottom wall 142 of the back plate 14 along with the expansion or contraction of the light guide plate 11. When the light guide plate 11 expands due to heat, the light guide plate 11 pushes the fixing member 12 to move toward the side wall 141 (i.e. the right side in the figure) of the back plate 14 relative to the bottom wall 142 of the back plate 14 against the elastic force of the elastic member 20; the light guide plate 11 expands and contracts, and the fixing member 12 moves toward the light guide plate 11 (i.e., the left side in the drawing) with respect to the bottom wall 142 of the rear plate 14 by the elastic force of the elastic member 20.

Alternatively, the protrusion 122 abuts against the side surface of the boss 112 of the light guide plate 11 close to the light bar 13 without being fixed. For example, the elastic force of the elastic member 20 causes the protrusion 122 to abut against the side surface of the boss 112 of the light guide plate 11, which is close to the light bar 13.

Optionally, the protrusion portion 122 may also be fixedly connected to the boss 112 of the light guide plate 11, for example, by using a heat dissipation double-sided tape, a fastening structure, or the like, so as to ensure the consistency of the movement of the fixing element 12 and the light guide plate 11, and facilitate to maintain the distance between the light incident surface a of the light guide plate 11 and the light bar 13.

Optionally, the fixing element 12 and the bottom wall 142 of the back plate 14 are disposed at an interval, that is, the fixing element 12 is disposed above the bottom wall 142 of the back plate 14 in a suspended manner, so as to avoid friction generated by the contact between the fixing element 12 and the bottom wall 142 of the back plate 14, and when the light guide plate 11 is expanded by heat, the fixing element 12 can be pushed to move relative to the bottom wall 142 of the back plate 14 by overcoming the elastic force of the elastic element 20.

Optionally, the elastic member 20 is a spring. The number of the elastic members 20 may be designed according to the length of the light bar 13.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the present application.

The display panel comprises a backlight module 1 and a display module 2. The display module 2 is used for displaying images, and the backlight module 1 is used for providing light sources for the display module 2. The backlight module 1 provided in any of the above embodiments is the backlight module 1, and the backlight module 1 provided in fig. 1 is taken as an example for description.

The display module 2 comprises a liquid crystal panel 21, wherein the liquid crystal panel 21 is arranged on one side of the light guide plate 11, which is far away from the bottom wall 142 of the back plate 14; the liquid crystal panel 21 is partially disposed on the side of the second portion 182 of the rubber frame 18 away from the bottom wall 142 of the back plate 14, and the foam rubber 22 is disposed between the liquid crystal panel 21 and the second portion 182 of the rubber frame 18.

The display panel further includes a front frame 3, the front frame 3 includes a third portion 31 and a fourth portion 32 connected to each other, the third portion 31 is disposed on a side of the first portion 181 of the plastic frame 18 away from the light bar 13, and the fourth portion 32 is disposed on a side of the second portion 182 of the plastic frame 18 away from the light guide plate 11.

The functions of the liquid crystal panel 21, the foam rubber 22 and the front frame 3 are the same as those of the prior art, and are not described again.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.

Claims

1. A backlight module includes:

the side surface of the light guide plate comprises a light incident surface;

the fixing piece comprises a body and a protruding part arranged on the body; the body is arranged on one side of the light incident surface of the light guide plate and is arranged at intervals with the light incident surface;

the light bar is arranged on the body and is arranged at intervals with the light incident surface;

the light guide plate is characterized in that along the length direction of the light bar, the length of the protruding part is smaller than that of the light guide plate; the protruding portion is in contact with the end portion, close to the light bar, of the light guide plate, and the light bar and the fixing piece displace together along with expansion or contraction of the light guide plate so as to keep the distance between the light bar and the light incident surface of the light guide plate.

2. The backlight module of claim 1, wherein the light bar is disposed on a surface of the body near the light guide plate, and the light bar comprises a printed circuit board and a plurality of light emitting devices disposed on the printed circuit board; the fixing piece comprises a plurality of protruding parts which are arranged at intervals along the length direction of the body; the projection of the plurality of the protruding parts on the lamp strip and the plurality of the light-emitting devices are arranged in a staggered mode, the position, corresponding to the protruding parts, of the printed circuit board is provided with a first opening, and the protruding parts penetrate through the first opening and are in contact with the end parts, close to the lamp strip, of the light guide plate.

3. The backlight module according to claim 2, further comprising a back plate comprising interconnected sidewalls and a bottom wall; the bottom wall of the back plate is arranged on one side of the light guide plate, which is far away from the light emergent surface, and the side wall of the back plate is arranged on one side of the body, which is far away from the light incident surface of the light guide plate; the protruding part is fixedly connected with the end part, close to the light bar, of the light guide plate, so that the fixing part moves relative to the bottom wall of the back plate along with expansion or contraction of the light guide plate.

4. The backlight module according to claim 3, wherein the inner surface of the back plate is provided with a plurality of spaced slide rails or slide grooves; the body is provided with a second opening matched with the sliding rail or a sliding block matched with the sliding groove, so that the fixing piece slides along the sliding rail or the sliding groove along with the expansion or contraction of the light guide plate.

5. The backlight module according to claim 4, wherein the back plate has a plurality of spaced slide rails on an inner surface thereof, and the body has second openings engaged with the slide rails; the sliding rails are respectively connected with the side wall and the bottom wall of the back plate; the convex part is connected with a common side wall between two adjacent second openings; the side wall of the sliding rail, which is matched with the two adjacent second openings, is provided with a limiting flange, the limiting flange is positioned between the protruding part and the bottom wall of the second opening, and the protruding part is positioned between the limiting flange and the bottom wall of the back plate.

6. The backlight module as claimed in claim 4, wherein the back plate has a plurality of spaced rails on an inner surface thereof, and the body has a groove for engaging with the rails; the fixing piece is arranged in a suspension mode through the sliding rail and is arranged at an interval with the bottom wall of the back plate.

7. The backlight module according to claim 2, further comprising a back plate comprising interconnected sidewalls and a bottom wall; the bottom wall of the back plate is arranged on one side, away from the light emitting surface, of the light guide plate, and the body is arranged between the light incident surface of the light guide plate and the side wall of the back plate; the body is connected with the side wall of the back plate through an elastic piece, and the protruding portion is abutted to the end portion, close to the light bar, of the light guide plate, so that the fixing piece moves relative to the bottom wall of the back plate along with expansion or contraction of the light guide plate.

8. The backlight module according to claim 7, wherein the fixing member is spaced from the bottom wall of the back plate.

9. The backlight module according to any one of claims 1-8, wherein the light guide plate comprises a plate body and a boss; the plate body is provided with a light emergent surface; the boss is arranged on the surface of the plate body opposite to the light emergent surface, and the boss is positioned at the end part of the plate body close to the light bar; the boss is in contact with the boss; the projection of the lamp strip on the light guide plate is located in the light incident surface.

10. A display panel, comprising:

the display module is used for displaying images;

the backlight module is used for providing a light source for the display module; the backlight module as claimed in any one of claims 1-9.