CN210742646U

CN210742646U - Direct type backlight module, interactive teaching blackboard and terminal equipment

Info

Publication number: CN210742646U
Application number: CN201921784063.5U
Authority: CN
Inventors: 王彬; 谢宇霆
Original assignee: Anhui Siji Electronic Technology Co Ltd
Current assignee: Anhui Siji Electronic Technology Co Ltd
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-06-12
Anticipated expiration: 2029-10-22

Abstract

The utility model discloses a straight following formula backlight unit, interactive blackboard of teaching and terminal equipment belongs to liquid crystal display technical field. The backlight module comprises a back plate, a reflecting film, an optical assembly and a liquid crystal panel which are sequentially arranged, a frame arranged at the periphery of the back plate, a light-emitting element arranged between the reflecting film and the optical assembly and connected with the back plate, and a light-ejecting column arranged between the reflecting film and the optical assembly and connected with the back plate, wherein the optical assembly is pressed on the frame through an ejection member. The back plate and the frame of the backlight module adopt split structures, the back plate and the frame are not required to be processed by adopting a punch forming process, the deformation is small, the profile precision is high, the optical performance of the whole backlight module is effectively improved, the structural stability is good, and the vibration deformation is not easy to occur.

Description

Direct type backlight module, interactive teaching blackboard and terminal equipment

Technical Field

The utility model belongs to the technical field of liquid crystal display, concretely relates to straight following formula backlight unit, interactive blackboard of teaching and terminal equipment.

Background

With the development of display technology, liquid crystal display devices have been widely used. Liquid Crystal Display (LCD) screen, which is called Liquid Crystal Display for short, is one kind of flat panel Display and is used for screen Display of TV set and computer. The liquid crystal display screen uses liquid crystal solution in two pieces of polarization materials, so that the crystal can be rearranged to achieve the purpose of imaging when current passes through the liquid, and the liquid crystal display screen has the advantages of low power consumption, small volume and low radiation.

The most important part of the lcd device is a backlight module, which can be divided into a side-in type backlight module and a direct type backlight module according to the difference of the Light incident positions of the Light sources, wherein the direct type backlight module is a backlight module in which the Light sources such as Light Emitting Diodes (LEDs) are arranged in a back array of the backlight module, and the emitted Light passes through optical films such as a Light guide plate and a brightness enhancement film to form a uniformly distributed surface backlight. The side-in type backlight module is that the light source is arranged at the side edge of the backlight module, and light enters the light guide plate, passes through the light guide plate and the optical film and then is converted into a uniformly distributed surface backlight source.

Traditional backlight unit is during manufacturing, its drain pan (be the backplate, backplate hem forms the frame) adopts panel beating stamping process to make usually, adopt this kind of mode, the one-time stamping forming of panel that adopts iron usually, and when adopting panel beating stamping process production drain pan, in the stamping process, main stress point is in the punching press recess, mainly be the backplate atress of drain pan, and the punching press shape is different, corresponding mechanical structure also can be different, if the punching press recess is intensive, then each regional atress dispersion, if the recess is loose, then the atress is concentrated relatively, cause the atress uneven easily, module backplate deformation, thereby can influence the optical effect of complete machine. In addition, adopt punching press integrated into one piece's drain pan, if the size of display is too big, because the rigidity of drain pan is limited, when external force acts on the module, cause the display to rock, the backplate takes place to warp easily, in module transportation or installation, very easily because the backplate vibrates the deformation and causes the display to damage. Therefore, it is necessary to solve the above-described problems.

Disclosure of Invention

The technical problem is as follows: the utility model provides a good, the structural strength is high, non-deformable's straight following formula backlight unit of optical effect to an interactive blackboard of teaching and a terminal equipment are provided.

The technical scheme is as follows: the utility model discloses a straight following formula backlight unit, including backplate, reflectance coating, optical assembly and the liquid crystal display panel who arranges in proper order, set up the frame at backplate edge all around, set up between reflectance coating and the optical assembly and with luminous element that the backplate is connected, set up between reflectance coating and optical assembly and with the top light post that the backplate is connected, optical assembly presses on the frame through ejection piece.

Furthermore, an ejection piece mounting groove and a protruding part are arranged on the frame; the ejection piece is provided with a plug-in part and a clamping groove; the inserting part is correspondingly inserted in the ejecting part mounting groove, and the protruding part is correspondingly inserted in the clamping groove, so that the edge of the optical assembly is fixed on the frame.

Further, the edge of the liquid crystal panel is fixedly arranged on the ejection member through a pressing strip.

Furthermore, the back plate and the frame are both made of aluminum magnesium alloy.

Furthermore, the light-emitting element is an LED lamp bead, and the LED lamp bead correspondingly penetrates through a lamp bead through hole formed in the reflecting film, so that the LED lamp bead is located between the reflecting film and the optical assembly.

Further, the reflective film is of a cover structure, the opening faces the optical assembly, and the ejection piece presses the edge of the reflective film and the optical assembly together onto the frame.

Further, a reinforcing rib is arranged on one side, away from the optical assembly, of the back plate.

Further, the frame is screwed with the ejection member.

The utility model discloses an interactive blackboard of teaching include straight following formula backlight unit.

The utility model discloses a terminal equipment include straight following formula backlight unit.

Has the advantages that: compared with the prior art, the utility model, have following advantage:

(1) the utility model discloses a straight following formula backlight unit, backplate and frame are the components of a whole that can function independently structure, set up the frame around the backplate promptly alone, therefore the backplate need not carry out stamping forming, consequently, among the prior art has been solved, backplate and the integrative stamping forming in-process of limit money because the stamping forming in-process, because the atress is inhomogeneous, the backplate can take place structural deformation, influence backlight unit optical property's problem to adopt the components of a whole that can function independently structure, need not stamping forming, the backplate surface does not have the deformation, the effectual optical property who improves backlight unit. Meanwhile, the split structure is adopted, the frame has a good supporting and reinforcing effect on the back plate, and particularly for a large-size backlight module, the whole body formed by the back plate and the frame has high strength and rigidity and is not easy to deform, so that the backlight module cannot be damaged due to vibration and deformation of the back plate in the transportation or installation process.

(2) The utility model discloses a straight following formula backlight unit because the structure of backplate has taken place the change to make the assembly change, the utility model discloses a straight following formula backlight unit only adopts and jets out the piece, with the optical assembly crimping on the frame to bear liquid crystal display panel, can play the bradyseism effect on the one hand, protect optical assembly and liquid crystal display panel, on the other hand makes the assembly simple and convenient, easily dismantles, has improved assembly efficiency effectively, and the repair in the later stage of being convenient for is maintained.

(3) The utility model discloses a straight following formula backlight unit directly adopts the layering to fix liquid crystal display panel on penetrating the piece, and is simple and convenient, the effectual assembly efficiency that has improved.

(4) The utility model discloses a straight following formula backlight unit adopts LED lamp pearl as optical element, especially preferred reflection type LED lamp pearl, has characteristics such as efficiency height, light are two little, stability is strong, the scattering is even, has improved backlight unit's optical property effectively.

(5) The utility model discloses a straight following formula backlight unit adopts aluminium magnesium alloy material's backplate and frame, and aluminium magnesium alloy rigidity is high non-deformable, the little quality of density is light, the heat conductivity is good, easily processing, consequently can effectively improve backlight unit's structural strength and heat dispersion, alleviates backlight unit's quality.

(6) The utility model discloses an in straight following formula backlight unit's an preferred structure, the reflectance coating is cover body structure for light can be at the inside more even reflection of backlight unit, and can avoid the light leak, has improved backlight unit's optical property effectively.

(7) The utility model discloses a straight following formula backlight unit, when the size is great, set up the strengthening rib in one side of backplate, can play the additional strengthening to backlight unit's structure, improved jumbo size backlight unit's structural stability.

Drawings

Fig. 1 is a three-dimensional structure diagram of a direct type backlight module of the present invention;

FIG. 2 is an exploded view of the direct type backlight module of the present invention;

fig. 3 is a cross-sectional view of a direct type backlight module of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a three-dimensional structure view (without reinforcing ribs and a side frame) of the direct type backlight module of the present invention;

FIG. 6 is a partial enlarged view of FIG. 5 at B;

fig. 7 is a structural diagram of an LED light bar employed in an embodiment of the present invention;

fig. 8 is a structural view of a reflection film employed in an embodiment of the present invention;

fig. 9 is a cross-sectional view of a frame of a direct type backlight module according to the present invention;

fig. 10 is a cross-sectional view of an ejection member of a direct type backlight module according to the present invention.

The figure shows that: 1. a back plate; 2. a frame; 3. a light emitting element; 4. a reflective film; 5. a topping column; 6. an optical component; 7. an ejection member; 8. a liquid crystal panel; 9. reinforcing ribs; 10. layering; 21. a first contact surface;

22. a projection; 23. a second contact surface; 24. an ejection member mounting groove; 41. the lamp bead is provided with a through hole; 61. a diffusion plate; 62. an optical film; 71. a first blank holder; 72. a plug-in part; 73. a card slot; 74. and (5) second pressing.

Detailed Description

The invention is further described with reference to the following examples and the accompanying drawings.

As shown in fig. 1, 2 and 3, the present invention relates to a direct type backlight module, which comprises a back plate 1, a reflective film 4, an optical assembly 6 and a liquid crystal panel 8 arranged in sequence, a frame 2 disposed on the periphery of the back plate 1, a light emitting element 3 disposed between the reflective film 4 and the optical assembly 6 and connected to the back plate 1, and a light ejecting column disposed between the reflective film 4 and the optical assembly 6 and connected to the back plate 1, wherein the optical assembly 6 is pressed on the frame 2 through an ejection member 7.

Specifically, backplate 1 is a flat board, sets up frame 2 at 1 all edges around of backplate, and frame 2 forms for four sections concatenations, the utility model discloses an in the embodiment, backplate 1 and frame 2's material is almag, adopts the laser welding mode to connect between every section frame 2 to form. Backplate 1 and frame 2 directly can adopt spiro union or riveted mode to be connected, nevertheless install optical assembly 6 back, backplate 1, frame 2 and optical assembly 6 enclose into a confined cavity, and light-emitting component 3, reflectance coating 4, top light post 5 all set up the cavity in, the cavity is inside can refer to figure 3 and show, figure 3 is the utility model discloses a straight following formula backlight unit's cross-sectional view. Because the reflective film 4 is relatively thin, the light emitting elements 3 are disposed on the back plate 1, through holes are formed in the reflective film 4, the light emitting elements 3 can pass through the through holes and are located between the reflective film 4 and the optical assembly 6, and the number of the light emitting elements 3 is determined by optical calculation according to the size of the backlight module. The utility model discloses an in the embodiment, what light emitting component 3 adopted is LED lamp pearl, and the preferred is reflective LED lamp pearl, and it has the lamp pearl through-hole 41 that corresponds with LED lamp pearl to open on reflectance coating 4, and LED lamp pearl passes corresponding lamp pearl through-hole 41. In order to facilitate installation of the LED lamp beads, the LED lamp beads can be made into an LED lamp strip, the LED lamp strip is structurally shown in fig. 7, and then the LED lamp strip is directly connected with the backboard 1, so that the LED lamp beads are connected with the backboard 1, the LED lamp strip and the backboard 1 can be connected through bolts, and all the LED lamp beads are connected in series to provide a light source for the backlight module.

The top light column 5 is connected with the back plate 1, and the reflecting film 4 is provided with a plurality of through holes, so that the top light column 5 can be connected on the back plate 1 by bolts or rivets. One end of the top light column 5 connected with the back plate 1 can press the reflection film 4, and the other end of the top light column is in contact with the optical assembly 6 and is used for supporting the optical assembly 6, so that the phenomenon that the optical assembly 6 is too large in size and generates concave deformation is avoided, and the optical performance of the whole backlight module is influenced.

The optical assembly 6 includes a diffuser 61 and an optical film 62, the type of the optical film 62 is selected according to the requirements of the backlight module, and the optical assembly 6 is used for enhancing the optical performance of the backlight module.

The utility model discloses a straight following formula backlight unit because backplate 1 and frame 2 are the structure of components of a whole that can function independently, consequently, need consider how optical assembly 6 assembles, for the more convenient assembly of optical assembly 6, the utility model discloses a shoot out 7 and fix optical assembly 6 with frame 2 matched with mode. The utility model discloses a straight following formula backlight unit's frame 2 uses the section bar, and the cross-section of its section bar is as shown in FIG. 9, be provided with first contact surface 21, second contact surface 23 on the frame 2, eject a mounting groove 24 and bulge 22, use the section bar equally on ejecting 7, its material is PC or PVC, and its section bar cross-section is as shown in FIG. 10, is provided with first blank holder 71, second blank holder 74, grafting portion 72 and draw-in groove 73 on ejecting 7. The inserting part 72 of the injection member 7 can be inserted into the injection member mounting groove 24 correspondingly, the protrusion 22 is inserted into the slot 73, when the injection member 7 is inserted in place, the first contact surface 21 contacts with the lower side surface of the first pressing edge 71, the edge of the optical component 6 is pressed on the second contact surface 23 by the second pressing edge 74, and then the injection member 7 is screwed and fixed with the rim 2, so that the optical component 6 is accurately assembled, as shown in fig. 3, 4, 5 and 6.

The utility model discloses an in the embodiment of straight following formula backlight unit, in order to make the complete machine have better optical property to prevent the light leak, reflectance coating 4 is cover body structure, and its structure is as shown in FIG. 8, and after reflectance coating 4 adorned, its bottom surface and 1 contact of backplate, opening orientation optical assembly 6 because cover body structure makes the reflection that light can be better, and can prevent the light leak. With the reflective film 4 of this configuration, when the injection member 7 presses the optical module 6 against the bezel 2, the edge of the reflective film 4 is also pressed against the bezel 2.

The liquid crystal panel 8 is fixed on the injection member 7 by the pressing strip 10, specifically, on the second pressing edge 74 of the injection member 7, and the pressing strip 10 can be a common adhesive tape with a single-sided adhesive function, so that the cost is low and the sticking is convenient.

To jumbo size backlight unit, the utility model discloses one side that can also keep away from optical assembly 6 at backplate 1 is provided with strengthening rib 9, and overall structure stability that can effectual improvement backlight unit avoids backplate 1, frame 2 etc. to take place to warp, and then has avoided arousing backlight unit's complete machine optical property because of warping.

The utility model provides an interactive blackboard of teaching, this interactive blackboard of teaching includes foretell straight following formula backlight unit.

The utility model provides a terminal equipment simultaneously, this terminal equipment includes foretell straight following formula backlight unit.

The above examples are only preferred embodiments of the present invention, it should be noted that: it will be apparent to those skilled in the art that various modifications and equivalents can be made without departing from the spirit of the invention, and it is intended that all such modifications and equivalents fall within the scope of the invention as defined in the claims.

Claims

1. The direct type backlight module is characterized by comprising a back plate (1), a reflecting film (4), an optical assembly (6) and a liquid crystal panel (8) which are sequentially arranged, a frame (2) arranged at the periphery of the back plate (1), a light-emitting element (3) arranged between the reflecting film (4) and the optical assembly (6) and connected with the back plate (1), and a light-ejecting column (5) arranged between the reflecting film (4) and the optical assembly (6) and connected with the back plate (1), wherein the optical assembly (6) is pressed on the frame (2) through an ejection piece (7).

2. A direct type backlight module as claimed in claim 1, wherein the frame (2) is provided with an ejection member mounting groove (24) and a protrusion (22); the ejection piece (7) is provided with a plug-in part (72) and a clamping groove (73);

the inserting part (72) is correspondingly inserted into the ejecting part mounting groove (24), the protruding part (22) is correspondingly inserted into the clamping groove (73), and the edge of the optical assembly (6) is fixed on the frame (2).

3. A direct type backlight module as claimed in claim 2, characterized in that the edges of the liquid crystal panel (8) are fixed on the output member (7) by a pressing strip (10).

4. The direct-type backlight module according to claim 1, wherein the back plate (1) and the frame (2) are made of aluminum-magnesium alloy.

5. The direct-type backlight module according to claim 1, wherein the light emitting elements (3) are LED beads, and the LED beads correspondingly penetrate through bead through holes (41) formed in the reflective film (4), so that the LED beads are located between the reflective film (4) and the optical assembly (6).

6. A direct type backlight module according to claim 1, 2, 3, 4 or 5, wherein the reflective film (4) is a cover structure with an opening facing the optical assembly (6), and the ejection member (7) presses the edge of the reflective film (4) and the optical assembly (6) together onto the frame (2).

7. A direct type backlight module according to claim 1, 2, 3, 4 or 5, wherein the side of the back plate (1) far away from the optical assembly (6) is provided with a reinforcing rib (9).

8. A direct type backlight module as claimed in claim 1, 2, 3, 4 or 5, wherein the frame (2) is screwed with the ejection member (7).

9. An interactive teaching blackboard comprising the direct type backlight module of any one of claims 1 to 8.

10. A terminal device, comprising the direct type backlight module according to any one of claims 1 to 8.