CN219202097U - Use stable straight following formula backlight unit - Google Patents

Abstract

The utility model discloses a direct type backlight module with stable use, which comprises a back plate, a light emitting mechanism, a light scattering mechanism and a front frame, wherein the light emitting mechanism and the light scattering mechanism are sequentially arranged in the back plate from back to front; the inner side wall of the back plate is provided with a first step, a second step and a diffusion plate limiting groove, the first step and the second step are sequentially arranged on the inner side wall of the back plate from back to front, and the diffusion plate limiting groove is arranged on the outer side of the first step; the diffusion mechanism comprises a diffusion plate and a diaphragm assembly, a diffusion plate limiting lug is arranged on the diffusion plate, the diffusion plate is arranged on the first step, the diffusion plate limiting lug is clamped in a diffusion plate limiting groove, and the diaphragm assembly is arranged on the second step. The utility model is used for providing a backlight source for display devices such as liquid crystal displays and the like which cannot emit light autonomously.

Description

Use stable straight following formula backlight unit

Technical Field

The utility model relates to the technical field of backlight sources, in particular to a direct type backlight module with stable use.

Background

The display is a main component of a display device such as a computer, a television, a vehicle-mounted display and the like, and the display device such as the computer, the television, the vehicle-mounted display and the like can only display the content required to be displayed through the display. The existing display mainly adopts a liquid crystal screen for display, and the liquid crystal screen cannot emit light autonomously, so that a backlight module is required to be configured for the liquid crystal screen to realize the display function of the liquid crystal screen. The backlight module comprises a direct type backlight module and a side-in type backlight module, wherein the direct type backlight module mainly comprises a back plate, a lamp panel, a diffusion plate, a diaphragm, a front frame and the like, and point light sources emitted by the lamp panel are converted into surface light sources by the diffusion plate and the diaphragm, so that the backlight module capable of uniformly emitting light is formed. In the prior direct type backlight module, the diffusion plate is directly supported on the front side of the back plate, and no special structure is used for fixing the diffusion plate, but the diffusion plate has heavier weight, and is easy to shift and other defects in the back plate, thereby affecting the luminous uniformity of the direct type backlight module and finally affecting the picture display effect of a display. For example, in the patent document "CN201810531011.0, a light guiding diffusion plate of a compound direct type backlight module" is directly supported on the front side of a back plate, and is not fixed by a special structure, and is easily displaced when being installed in the back plate, so that the uniformity of light emission is affected when the direct type backlight module is used, and finally the picture display effect of a display is affected.

Disclosure of Invention

The utility model provides a direct type backlight module which can be used stably, aiming at solving the technical problems that in the prior art, a diffusion plate is directly supported on the front side of a back plate, no special structure is used for fixing the diffusion plate, and the diffusion plate is easy to shift and the like when being installed in the back plate, so that the uniformity of luminescence is influenced when the direct type backlight module is used, and finally the picture display effect of a display is influenced.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the direct type backlight module comprises a back plate, a light emitting mechanism, a light scattering mechanism and a front frame, wherein the light emitting mechanism and the light scattering mechanism are sequentially arranged in the back plate from back to front, the front frame is fixed on the back plate, and the front frame presses and fixes the light scattering mechanism in the back plate; the inner side wall of the back plate is provided with a first step, a second step and a diffusion plate limiting groove, the first step and the second step are sequentially arranged on the inner side wall of the back plate from back to front, and the diffusion plate limiting groove is arranged on the outer side of the first step; the diffusion plate limiting projection is matched with the diffusion plate limiting groove, the diffusion plate is arranged on the first step, and the diffusion plate limiting projection is clamped in the diffusion plate limiting groove; the diaphragm assembly is adapted to the second step, and the diaphragm assembly is mounted on the second step.

Further, a first double-sided adhesive tape is arranged on the first step, a second double-sided adhesive tape is arranged on the second step, the diffusion plate is fixedly adhered to the first step through the first double-sided adhesive tape, and the diaphragm assembly is fixedly adhered to the second step through the second double-sided adhesive tape.

Further, the diaphragm assembly comprises a light diffusion film, a lower light enhancement film, a middle light enhancement film and an upper light enhancement film, wherein the light diffusion film, the lower light enhancement film, the middle light enhancement film and the upper light enhancement film are sequentially stacked on the diffusion plate; the light scattering film, the lower brightness enhancement film and the middle brightness enhancement film are respectively provided with an avoidance opening, the avoidance openings on the light scattering film, the lower brightness enhancement film and the middle brightness enhancement film are gradually reduced, and the second double-sided adhesive tape is fixedly adhered to the lower brightness enhancement film, the middle brightness enhancement film and the upper brightness enhancement film through the avoidance openings.

Further, a diaphragm limiting groove is formed in the inner side wall of the backboard, diaphragm limiting convex blocks are arranged on the outer sides of the light scattering film, the lower brightness enhancement film, the middle brightness enhancement film and the upper brightness enhancement film, the diaphragm limiting groove is matched with the diaphragm limiting convex blocks, and the diaphragm limiting convex blocks are clamped and fixed in the diaphragm limiting groove.

Further, a first fixing clamping groove is formed in the inner side wall of the backboard, a first fixing clamping block is arranged on the front frame, the first fixing clamping groove is matched with the first fixing clamping block, and the first fixing clamping block is clamped in the first fixing clamping groove.

Further, be provided with preceding frame supporting groove on the backplate, be provided with preceding frame supporting shoe on the preceding frame, preceding frame supporting groove and preceding frame supporting shoe looks adaptation, preceding frame supporting shoe bonds in preceding frame supporting groove through third double faced adhesive tape.

Further, the first fixing clamping groove and the front frame supporting groove are arranged on two short sides of the backboard, a third double-sided adhesive tape is arranged on the outer side of one long side of the backboard, and one long side of the front frame is fixedly adhered to the backboard through the third double-sided adhesive tape.

Further, a second fixing clamping block is arranged outside the other long side of the backboard, a second fixing clamping groove is formed in the front frame, the second fixing clamping block is matched with the second fixing clamping groove, and the second fixing clamping block is clamped in the second fixing clamping groove.

Further, the light-emitting mechanism comprises a heat-conducting double-sided adhesive tape, a lamp panel and a reflecting film, wherein the lamp panel is fixedly adhered to the bottom of the inner side of the back plate through the heat-conducting double-sided adhesive tape, and the reflecting film is attached to the front side of the lamp panel.

Further, the bottom of the inner side of the back plate is provided with a positioning column, the lamp panel is provided with a positioning hole, the positioning column is matched with the positioning hole, and the positioning column is inserted into the positioning hole.

The beneficial effects achieved by the utility model mainly comprise the following points: be provided with first step, second step and diffuser plate spacing groove on the backplate inside wall of straight following formula backlight unit, the diffuser plate is installed on first step just, has guaranteed the stability of diffuser plate installation in the backplate to the stability when having guaranteed straight following formula backlight unit and having used. When the diffusion plate is installed on the first step, the diffusion plate limiting protruding blocks are just clamped in the diffusion plate limiting grooves, and the installation stability of the diffusion plate in the back plate is further improved. The diaphragm assembly is just installed on the second step, so that the stability of the diaphragm assembly installed in the back plate is improved, and the stability of the direct type backlight module in use is further guaranteed.

Drawings

FIG. 1 is a schematic diagram of an explosion structure of a direct type backlight module using stabilization in an embodiment of the utility model;

FIG. 2 is a schematic view of a back plate with an angle according to an embodiment of the present utility model;

FIG. 3 is a schematic view of the part A of FIG. 2 in an enlarged partial structure;

FIG. 4 is a schematic view of the part B of FIG. 2 in an enlarged partial structure;

FIG. 5 is a schematic view of a back plate according to another embodiment of the present utility model;

FIG. 6 is a schematic view of a part of the enlarged structure of the portion C in FIG. 5;

FIG. 7 is a schematic view of the part of the portion D in FIG. 5 in an enlarged configuration;

FIG. 8 is a schematic view of the enlarged partial structure of the E portion in FIG. 5;

FIG. 9 is a schematic view of the structure of the front frame at an angle in the embodiment of the present utility model;

FIG. 10 is a schematic view of the enlarged partial structure of the portion F in FIG. 9;

FIG. 11 is a schematic view of a front frame at another angle in an embodiment of the present utility model;

FIG. 12 is a schematic view of the portion G of FIG. 11 in a partially enlarged configuration;

FIG. 13 is a schematic view of a diffuser plate according to an embodiment of the present utility model;

FIG. 14 is a schematic view showing the structures of a light diffusing film, a lower brightness enhancement film, a middle brightness enhancement film and an upper brightness enhancement film according to the embodiment of the present utility model;

FIG. 15 is a schematic view of the enlarged partial structure of the H portion in FIG. 14;

fig. 16 is a schematic diagram of an explosion structure of a heat conducting double sided adhesive tape, a lamp panel and a reflective film mounted in a back plate according to an embodiment of the present utility model.

The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar components; the terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limiting the present patent.

Detailed Description

The present utility model will be described in further detail below with reference to the drawings and examples for the understanding of those skilled in the art.

Example 1

Referring to fig. 1 to 16, a stable direct type backlight module is used for providing a backlight source for a display device such as a liquid crystal display which cannot emit light autonomously. The direct type backlight module comprises a back plate 1, a light emitting mechanism 2, a light scattering mechanism 3 and a front frame 4, wherein the back plate 1 and the front frame 4 are used for installing and fixing the light emitting mechanism 2 and the light scattering mechanism 3, the light emitting mechanism 2 and the light scattering mechanism 3 are sequentially arranged in the back plate 1 from back to front, the front frame 4 is fixed on the back plate 1, and the front frame 4 presses and fixes the light scattering mechanism 3 in the back plate 1, so that the backlight module with an integral structure is formed. The inner side wall of the back plate 1 is provided with a first step 11, a second step 12 and a diffusion plate limiting groove 13, the first step 11 and the second step 12 are sequentially arranged on the inner side wall of the back plate 1 from back to front, and the diffusion plate limiting groove 13 is arranged on the outer side of the first step 11. The light diffusing mechanism 3 comprises a diffusion plate 31 and a membrane component 32, the diffusion plate 31 is provided with a diffusion plate limiting projection 311, the diffusion plate 31 is matched with the first step 11, namely, the size, shape and thickness of the diffusion plate 31 are consistent with those of the space on the first step 11, so that the diffusion plate 31 is just stably arranged on the first step 11, the stability of the diffusion plate in the back plate 1 is ensured, and the stability of the direct type backlight module in use is ensured. The diffuser plate spacing lug 311 is adapted with the diffuser plate spacing groove 13, that is, the position, size, quantity and shape of the diffuser plate spacing lug 311 are consistent with the position, size, quantity and shape of the diffuser plate spacing groove 13, so that when the diffuser plate 31 is installed on the first step 11, the diffuser plate spacing lug 311 is just clamped and fixed in the diffuser plate spacing groove 13, and the installation stability of the diffuser plate in the back plate 1 is further improved. The membrane component 32 is matched with the second step 12, that is, the size, shape and thickness of the membrane component 32 are consistent with the size, shape and depth of the space on the second step 12, so that the membrane component 32 is just stably arranged on the second step 12, the stability of the membrane component 32 in the back plate 1 is improved, and the stability of the direct type backlight module in use is further ensured.

Referring to fig. 1, 5 and 8, in order to further improve the stability of the installation of the diffusion plate 31 and the membrane assembly 32 in the back plate 1, a first double sided adhesive tape is disposed on the first step 11, a second double sided adhesive tape is disposed on the second step 12, the diffusion plate 31 is adhered and fixed on the first step 11 by the first double sided adhesive tape, and the membrane assembly 32 is adhered and fixed on the second step 12 by the second double sided adhesive tape, so that the diffusion plate 31 and the membrane assembly 32 can be fixed in the back plate 1 by stable adhesion of the double sided adhesive tape, the installation stability of the diffusion plate 31 and the membrane assembly 32 in the back plate 1 can be improved, and the use stability of the direct type backlight module is further improved.

Referring to fig. 1 and 14, in order to improve the brightness and uniformity of the backlight module, the film assembly 32 has a structure including a light-diffusing film 321, a lower brightness enhancement film 322, a middle brightness enhancement film 323 and an upper brightness enhancement film 324, wherein the light-diffusing film 321, the lower brightness enhancement film 322, the middle brightness enhancement film 323 and the upper brightness enhancement film 324 are sequentially stacked on the diffusion plate 31. In order to facilitate the adhesion and fixation of the lower and middle light enhancement films 322, 323 and 324 on the second step 12, the light diffusion film 321, the lower and middle light enhancement films 322 and 323 are provided with avoiding openings 325 on the upper and outer sides thereof, the avoiding openings 325 on the light diffusion film 321, the lower and middle light enhancement films 322 and 323 become smaller gradually, and the second double-sided adhesive is adhered and fixed to the lower and middle light enhancement films 322 and 323 and 324 through the avoiding openings 325, so that the multilayer films can be adhered and fixed on the second step 12 by one double-sided adhesive, namely, the light diffusion film 321, the lower and middle light enhancement films 322 and 323 and the upper light enhancement films 324 can be adhered and fixed on the second step 12, and the adhesion and fixation operation of the light diffusion film 321, the lower and middle light enhancement films 322 and 324 on the second step 12 is also facilitated. The upper brightness enhancement film 324 may be a DBEF film.

Referring to fig. 1-3 and fig. 13-15, in order to further improve the stability of the installation of the light-diffusing film 321, the lower brightness enhancement film 322, the middle brightness enhancement film 323 and the upper brightness enhancement film 324 in the back plate 1, the inner side wall of the back plate 1 is provided with a film limiting groove 19, the outer sides of the light-diffusing film 321, the lower brightness enhancement film 322, the middle brightness enhancement film 323 and the upper brightness enhancement film 324 are respectively provided with a film limiting bump 326, the film limiting groove 19 is matched with the film limiting bump 326, that is, the position, the size, the shape and the number of the film limiting grooves 19 are consistent with the position, the size, the shape and the number of the film limiting bumps 326, so that the film limiting bumps 326 are exactly clamped in the film limiting grooves 19, and the installation of the light-diffusing film 321, the lower brightness enhancement film 322, the middle brightness enhancement film 323 and the upper brightness enhancement film 324 in the back plate 1 is further stable.

Referring to fig. 1, a film pressing foam rubber 5 is disposed on the inner side of a front frame 4 and abuts against an upper brightness enhancement film 324, a surface foam rubber 6 is disposed on the outer side of the front frame 4 to facilitate installation of a display screen, and an L-shaped silica gel 8 is disposed on the outer side of a diffusion plate 31 to clamp the diffusion plate 31 in a back plate 1.

Referring to fig. 1 to 16, when the direct type backlight module of the present embodiment is installed, the light emitting mechanism 2 and the light diffusing mechanism 3 are installed in the back plate 1, and then the front frame 4 is fixed on the back plate 1, so as to form a backlight module with stable structure. When the light scattering mechanism 3 is installed, the diffusion plate 31 is firstly adhered and fixed on the first step 11 through the first double-sided adhesive, and the diffusion plate limiting bump 311 is clamped and fixed in the diffusion plate limiting groove 13 during installation; and then the light diffusion film 321, the lower brightness enhancement film 322, the middle brightness enhancement film 323 and the upper brightness enhancement film 324 are sequentially overlapped on the diffusion plate 31 and are adhered and fixed on the second step 12 through the second double-sided adhesive, and the diaphragm limiting bump 326 is clamped and fixed in the diaphragm limiting groove 19. The direct type backlight module is used for providing a backlight source for display devices such as liquid crystal displays and the like which cannot emit light autonomously.

Example two

Referring to fig. 1 to 16, the whole direct type backlight module with stability in this embodiment is the same as that in the first embodiment, and the mounting structure of the front frame 4 and the back plate 1 is improved based on the first embodiment, and the same point of this embodiment as that of the first embodiment is referred to in the first embodiment, and the improvement will be further described.

Referring to fig. 2 to 12, a first fixing slot 14 is provided on the inner sidewall of the back plate 1, a first fixing block 41 is provided on the front frame 4, and the first fixing slot 14 is adapted to the first fixing block 41, that is, the position, size, shape and number of the first fixing slot 14 are consistent with the position, size, shape and number of the first fixing block 41, so that the first fixing block 41 can be just clamped in the first fixing slot 14, and the front frame 4 is fixed on the inner sidewall of the back plate 1.

Referring to fig. 2 to 12, in order to further improve the stability of the installation of the front frame 4 on the back plate 1 and the supporting capability of the front frame 4, the back plate 1 is provided with a front frame supporting groove 15, the front frame 4 is provided with a front frame supporting block 42, and the front frame supporting groove 15 is matched with the front frame supporting block 42, that is, the position, size, shape and number of the front frame supporting grooves 15 are consistent with those of the front frame supporting block 42, so that the front frame supporting block 42 can be just installed in the front frame supporting groove 15. The front frame supporting block 42 is preferably adhered in the front frame supporting groove 15 through the third double faced adhesive tape 151, so that the stability of the front frame 4 mounted on the back plate 1 is further improved, and the use stability of the direct type backlight module is ensured.

Referring to fig. 1 to 12, in the present embodiment, the first fixing clip 41 and the front frame support 42 are disposed on two short sides of the front frame 4, and the first fixing clip groove 14 and the front frame support groove 15 are disposed on two short sides of the back plate 1. The outer side of one long side of the back plate 1 is provided with a third double faced adhesive tape 16, the outer side of one long side of the front frame 4 is provided with an L-shaped turnover structure, and the L-shaped turnover structure is fixedly adhered to the back plate 1 through the third double faced adhesive tape 16. The other long side of the backboard 1 is externally provided with a second fixed clamping block 17, the front frame 4 is provided with a second fixed clamping groove 43, and the second fixed clamping block 17 is matched with the second fixed clamping groove 43, namely, the position, the size, the shape and the number of the second fixed clamping blocks 17 are consistent with those of the second fixed clamping groove 43, so that the second fixed clamping blocks 17 are exactly clamped in the second fixed clamping groove 43. In addition, the sealant 7 is preferably disposed between the side of the front frame 4 where the second fixing slot 43 is disposed and the outer side of the back plate 1, and the front frame 4 and the back plate 1 are sealed by the sealant 7, so as to prevent dust from entering the direct type backlight module. Therefore, the mounting stability of the front frame 4 on the back plate 1 can be further improved, and the use stability of the direct type backlight module is ensured.

Referring to fig. 1 to 16, when the direct type backlight module of the present embodiment is installed, the light emitting mechanism 2 and the light diffusing mechanism 3 are installed in the back plate 1, and then the front frame 4 is fixed on the back plate 1, so as to form a backlight module with stable structure. When the light scattering mechanism 3 is installed, the diffusion plate 31 is firstly adhered and fixed on the first step 11 through the first double-sided adhesive, and the diffusion plate limiting bump 311 is clamped and fixed in the diffusion plate limiting groove 13 during installation; and then the light diffusion film 321, the lower brightness enhancement film 322, the middle brightness enhancement film 323 and the upper brightness enhancement film 324 are sequentially overlapped on the diffusion plate 31 and are adhered and fixed on the second step 12 through the second double-sided adhesive, and the diaphragm limiting bump 326 is clamped and fixed in the diaphragm limiting groove 19. When the front frame 4 is fixedly mounted on the back plate 1, the first fixing clamping block 41 is clamped and fixed in the first fixing clamping groove 14, the front frame supporting block 42 is mounted in the front frame supporting groove 15, and the second fixing clamping block 17 is clamped and fixed in the second fixing clamping groove 43. The direct type backlight module is used for providing a backlight source for display devices such as liquid crystal displays and the like which cannot emit light autonomously.

Example III

Referring to fig. 1 to 16, the whole direct type backlight module using the stabilization in this embodiment is the same as that in the second embodiment, and the structure of the light emitting mechanism 2 is improved based on the second embodiment, and the point of the present embodiment is the same as that in the second embodiment, and the improvement is further described below.

Referring to fig. 16, the light emitting mechanism 2 includes a heat-conducting double faced adhesive tape 21, a lamp panel 22 and a reflective film 23, wherein the lamp panel 22 is adhered and fixed on the bottom of the inner side of the back plate 1 by the heat-conducting double faced adhesive tape 21, so that heat generated during operation of the lamp panel 22 can be conducted onto the back plate 1 by the heat-conducting double faced adhesive tape 21, and further dissipated by the back plate 1. The reflective film 23 is attached to the front side of the lamp panel 22, and reflects the light emitted by the lamp panel 22 to the front side of the backlight module, thereby improving the brightness of the backlight module. The backboard 1 adopts die casting, and the lamp panel 22 adopts a structure that an LED lamp is arranged on a PCB.

Referring to fig. 16, in order to facilitate the installation of the lamp panel 22 at the bottom of the inner side of the back plate 1, the bottom of the inner side of the back plate 1 is provided with a positioning column 18, the lamp panel 22 is provided with a positioning hole 221, and the positioning column 18 is matched with the positioning hole 221, i.e. the position, the shape and the size of the positioning column 18 are consistent with those of the positioning hole 221, so that the positioning column 18 can be just inserted into the positioning hole 221, and the lamp panel 22 can be positioned with the positioning hole 221 through the positioning column 18 when the bottom of the inner side of the back plate 1 is installed.

Referring to fig. 1 to 16, when the direct type backlight module of the present embodiment is installed, the light emitting mechanism 2 and the light diffusing mechanism 3 are installed in the back plate 1, and then the front frame 4 is fixed on the back plate 1, so as to form a backlight module with stable structure. When the light emitting mechanism 2 is installed, the lamp panel 22 is adhered and fixed at the bottom of the inner side of the back plate 1 through the heat conducting double faced adhesive tape 21, and the reflecting film 23 is attached to the front side of the lamp panel 22. When the light scattering mechanism 3 is installed, the diffusion plate 31 is firstly adhered and fixed on the first step 11 through the first double-sided adhesive, and the diffusion plate limiting bump 311 is clamped and fixed in the diffusion plate limiting groove 13 during installation; and then the light diffusion film 321, the lower brightness enhancement film 322, the middle brightness enhancement film 323 and the upper brightness enhancement film 324 are sequentially overlapped on the diffusion plate 31 and are adhered and fixed on the second step 12 through the second double-sided adhesive, and the diaphragm limiting bump 326 is clamped and fixed in the diaphragm limiting groove 19. When the front frame 4 is fixedly mounted on the back plate 1, the first fixing clamping block 41 is clamped and fixed in the first fixing clamping groove 14, the front frame supporting block 42 is mounted in the front frame supporting groove 15, and the second fixing clamping block 17 is clamped and fixed in the second fixing clamping groove 43. The direct type backlight module is used for providing a backlight source for display devices such as liquid crystal displays and the like which cannot emit light autonomously.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The utility model provides a use stable straight following formula backlight unit which characterized in that: the light-emitting device comprises a back plate (1), a light-emitting mechanism (2), a light-scattering mechanism (3) and a front frame (4), wherein the light-emitting mechanism (2) and the light-scattering mechanism (3) are sequentially arranged in the back plate (1) from back to front, the front frame (4) is fixed on the back plate (1), and the light-scattering mechanism (3) is pressed and fixed in the back plate (1) by the front frame (4); the novel back plate comprises a back plate (1), and is characterized in that a first step (11), a second step (12) and a diffusion plate limiting groove (13) are formed in the inner side wall of the back plate (1), the first step (11) and the second step (12) are sequentially arranged on the inner side wall of the back plate (1) from back to front, and the diffusion plate limiting groove (13) is formed in the outer side of the first step (11); the diffusion mechanism (3) comprises a diffusion plate (31) and a membrane assembly (32), wherein a diffusion plate limiting lug (311) is arranged on the diffusion plate (31), the diffusion plate (31) is matched with the first step (11), the diffusion plate limiting lug (311) is matched with the diffusion plate limiting groove (13), the diffusion plate (31) is arranged on the first step (11), and the diffusion plate limiting lug (311) is clamped in the diffusion plate limiting groove (13); the diaphragm assembly (32) is matched with the second step (12), and the diaphragm assembly (32) is installed on the second step (12).

2. The use-stable direct type backlight module according to claim 1, wherein: the first step (11) is provided with a first double-sided adhesive tape, the second step (12) is provided with a second double-sided adhesive tape, the diffusion plate (31) is fixedly adhered to the first step (11) through the first double-sided adhesive tape, and the diaphragm assembly (32) is fixedly adhered to the second step (12) through the second double-sided adhesive tape.

3. The use-stable direct type backlight module according to claim 2, wherein: the diaphragm assembly (32) comprises a light diffusion film (321), a lower brightness enhancement film (322), a middle brightness enhancement film (323) and an upper brightness enhancement film (324), wherein the light diffusion film (321), the lower brightness enhancement film (322), the middle brightness enhancement film (323) and the upper brightness enhancement film (324) are sequentially stacked on the diffusion plate (31); the novel light-diffusing film comprises a light-diffusing film (321), a lower brightness enhancement film (322) and a middle brightness enhancement film (323), wherein avoidance openings (325) are formed in the light-diffusing film (321), the lower brightness enhancement film (322) and the middle brightness enhancement film (323), the avoidance openings (325) in the light-diffusing film (321), the lower brightness enhancement film (322) and the middle brightness enhancement film (323) are gradually reduced, and the second double-sided adhesive tape is fixedly bonded with the lower brightness enhancement film (322), the middle brightness enhancement film (323) and the upper brightness enhancement film (324) through the avoidance openings (325).

4. The use-stable direct type backlight module according to claim 3, wherein: be provided with diaphragm spacing groove (19) on backplate (1) inside wall, light dispersion membrane (321), lower brightness enhancement film (322), well brightness enhancement film (323) and last brightness enhancement film (324) outside all are provided with diaphragm spacing lug (326), diaphragm spacing groove (19) and diaphragm spacing lug (326) looks adaptation, diaphragm spacing lug (326) card is solid in diaphragm spacing groove (19).

5. The use-stable direct type backlight module according to any one of claims 1 to 4, wherein: the novel back plate comprises a back plate (1), and is characterized in that a first fixing clamping groove (14) is formed in the inner side wall of the back plate (1), a first fixing clamping block (41) is arranged on the front frame (4), the first fixing clamping groove (14) is matched with the first fixing clamping block (41), and the first fixing clamping block (41) is clamped in the first fixing clamping groove (14).

6. The use-stable direct type backlight module according to claim 5, wherein: the back plate (1) is provided with a front frame supporting groove (15), the front frame (4) is provided with a front frame supporting block (42), the front frame supporting groove (15) is matched with the front frame supporting block (42), and the front frame supporting block (42) is adhered in the front frame supporting groove (15) through a third double-sided adhesive tape (151).

7. The use-stable direct type backlight module according to claim 6, wherein: the first fixing clamping grooves (14) and the front frame supporting grooves (15) are formed in two short sides of the back plate (1), third double-sided adhesive tapes (16) are arranged on the outer side of one long side of the back plate (1), and one long side of the front frame (4) is fixedly bonded to the back plate (1) through the third double-sided adhesive tapes (16).

8. The use-stable direct type backlight module according to claim 7, wherein: the other long side of the backboard (1) is externally provided with a second fixing clamping block (17), the front frame (4) is provided with a second fixing clamping groove (43), the second fixing clamping block (17) is matched with the second fixing clamping groove (43), and the second fixing clamping block (17) is clamped and fixed in the second fixing clamping groove (43).

9. The use-stable direct type backlight module according to claim 8, wherein: the light-emitting mechanism (2) comprises a heat-conducting double-sided tape (21), a lamp panel (22) and a reflecting film (23), wherein the lamp panel (22) is fixedly adhered to the bottom of the inner side of the back plate (1) through the heat-conducting double-sided tape (21), and the reflecting film (23) is attached to the front side of the lamp panel (22).

10. The use-stable direct type backlight module according to claim 9, wherein: the LED lamp comprises a back plate (1), and is characterized in that a positioning column (18) is arranged at the bottom of the inner side of the back plate (1), a positioning hole (221) is formed in a lamp panel (22), the positioning column (18) is matched with the positioning hole (221), and the positioning column (18) is inserted into the positioning hole (221).

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