CN104122691B - Display unit without screws - Google Patents

Abstract

The invention relates to a screwless display device, comprising a front shell (10), a display module (15), a support structure (17) and a rear shell (21). The front shell has a hollow portion, an inner edge surrounding and adjacent to the hollow portion, and an outer edge remote from the hollow portion. The front shell is provided with a first buckling piece which is positioned on the inner edge. The display module has a display surface (16), wherein the first fastener is fastened with the edge of the display module and the display surface is arranged corresponding to the hollow portion. The supporting structure is provided with a second fastener and a substrate (19), and the substrate is electrically connected with the display module. The front shell is also provided with a third fastener which is positioned between the outer edge and the inner edge, and the second fastener and the third fastener are mutually fastened. The rear shell is provided with a fourth buckling piece, the front shell is further provided with a fifth buckling piece which is located on the outer edge, the fourth buckling piece and the fifth buckling piece are mutually buckled, and the front shell is connected with the rear shell.

Description

Display unit without screws

technical field

The invention relates to a display device; in particular, a screwless display device.

Background technique

The main components of the existing liquid crystal display device include a front case, a rear case, a display module, a support structure, a substrate, a speaker, and a wireless transmission module. In the accommodation space, the display module is fixed on the front case, the panel drive module and the power supply module are installed on the substrate and electrically connected to the display module through the cable, the substrate is fixed on the support structure, and the support structure is fixed on the front case and its Located between the display module and the rear case, the loudspeaker is also arranged in the accommodating space.

The main problem in the prior art is that no matter the above-mentioned front case, rear case, display module, support structure, substrate, speaker or wireless transmission module, it is necessary to design corresponding screw holes and nut seats, and use corresponding screws to lock them together so that Fix the above parts. During the assembly process, it is necessary to align the screw holes on each component to be assembled with the nut seat in sequence, and lock the screws one by one to fix them. As mentioned above, the assembly process consumes a lot of man-hours and a lot of manpower to meet the needs of assembly. In addition, if the locking force is too large, it will easily cause material damage and increase the defective rate of products; if the locking force is too small, it may cause loosening and make the whole The machine assembly is not tight and requires heavy work, resulting in high production costs.

Contents of the invention

In view of this, the object of the present invention is to propose a simple and cheap display device that does not need to be locked by screws, in order to simplify the assembly process and improve the convenience of assembly, so as to reduce man-hours and manpower consumption and reduce production costs. .

To achieve the above object, the present invention provides a screwless display device, which includes a front case, a display module, a supporting structure and a rear case. The front shell has a hollow portion, an inner edge and an outer edge, the inner edge surrounds and is adjacent to the hollow portion, and the outer edge is away from the hollow portion. The front shell has a first buckle, and the first buckle is located on the inner edge. The display module has a display surface, wherein the first buckle engages the edge of the display module and the display surface is set corresponding to the hollow part. The supporting structure has a second buckle and is provided with a substrate, and the substrate is electrically connected to the display module. The front shell also has a third buckle, the third buckle is located between the outer edge and the inner edge, and the second buckle and the third buckle are engaged with each other. The rear case has a fourth buckle, the front case also has a fifth buckle, the fifth buckle is located on the outer edge, the fourth buckle and the fifth buckle are engaged with each other, and the front case is connected to the rear case.

In an exemplary embodiment, one of the third buckle and the second buckle is a hook, and the other is a slot; the fifth buckle and the fourth buckle One of them is a hook, and the other is a slot.

In an exemplary embodiment, the front shell also has a first positioning piece and a first elastic element, the support structure also has a second positioning piece, one of the first positioning piece and the second positioning piece is a positioning column , the other of which is a positioning hole, the first positioning piece and the second positioning piece are fitted and positioned with each other, and one end of the first elastic element abuts against the supporting structure.

In an exemplary embodiment, the front shell also has a third positioning piece, the third positioning piece is located on the outer edge, the rear shell also has a fourth positioning piece, one of the third positioning piece and the fourth positioning piece is a positioning plate, the other of which is a positioning groove, the thickness of the positioning plate decreases toward the direction of the free end of the positioning plate, and the width of the positioning groove increases toward the opening of the positioning groove, the thickness and width correspond to each other, the third positioning member Insert and position with the fourth positioning piece.

In an exemplary embodiment, the display device further includes a side shell, the side shell has a sixth buckle, the front shell and the rear shell are each provided with a seventh buckle, the sixth buckle and the seventh buckle The side shells are engaged with each other, and the side shells are connected between the front shell and the rear shell.

In an exemplary embodiment, the side shell has a fifth positioning piece, the rear shell has a sixth positioning piece, one of the fifth positioning piece and the sixth positioning piece is a positioning column, and the other is a positioning hole, The fifth locating piece and the sixth locating piece are nested and positioned with each other.

In an exemplary embodiment, the display device further includes a wireless transmission module, the wireless transmission module has a wireless transmission substrate, the front case also has an eighth buckle and a seventh positioning piece, the eighth buckle is a hook, and The seventh positioning part has a guide groove, and the wireless transmission substrate is inserted into the guide groove and fixed with the eighth buckling part.

In an exemplary embodiment, the front case further has a second elastic element, one end of the second elastic element abuts against the front end of the wireless transmission substrate, and the eighth buckle engages the rear end of the wireless transmission substrate.

In an exemplary embodiment, the substrate has input and output terminals, the rear shell is penetrated with a terminal hole, and the rear shell is extended towards the direction of the substrate with a terminal positioning plate, one end of the input and output terminal is penetrated in the terminal hole, and The terminal positioning plate is adjacent to the input and output terminals.

In an exemplary embodiment, the display device further includes a speaker, the speaker has a fixing plate, the front case further has a first fixing member, the rear case further has a second fixing member, the first fixing member abuts against one side of the fixing plate, The second fixing piece abuts against the other side of the fixing plate.

The present invention proposes a screwless display device, which uses its own material elasticity and the design of the snap-in structure, without the need to use screws to lock the front case, the display module, the supporting structure, the substrate, and the side case. The assembly can be completed by snapping and fixing with the back shell and other components in sequence, which can simplify the assembly process and improve the convenience of assembly, so as to reduce man-hours and manpower consumption and reduce production costs.

In order to make the purpose, features and advantages of the present invention easier for those skilled in the art to understand, a preferred embodiment is given below and described in detail in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is an exploded view of a display device according to a preferred embodiment of the present invention.

FIG. 2 is a schematic diagram of a front case of a display device according to a preferred embodiment of the present invention.

Figure 2a is a partial view of the front shell shown in Figure 2.

Figure 2b is the second partial view of the front shell shown in Figure 2 .

Figure 2c is the third partial view of the front shell shown in Figure 2 .

Figure 2d is a partial view four of the front shell shown in Figure 2 .

FIG. 3 is a schematic diagram of a rear case of a display device according to a preferred embodiment of the present invention.

Fig. 3a is a partial diagram 1 of the back shell shown in Fig. 3 .

Figure 3b is the second partial view of the back shell shown in Figure 3 .

Figure 3c is the third partial view of the back shell shown in Figure 3 .

FIG. 4 is a schematic diagram of assembly of a front case, a display module, a substrate and a supporting structure according to a preferred embodiment of the present invention.

FIG. 4a is a partial assembly diagram 1 of the front case, the display module, the substrate and the supporting structure shown in FIG. 4 .

Fig. 4b is a partial assembly diagram 2 of the front case, the display module, the substrate and the supporting structure shown in Fig. 4 .

FIG. 5 is a schematic diagram of a side shell of a display device according to a preferred embodiment of the present invention.

Fig. 6 is a schematic diagram of the assembly of the side shell and the rear shell of a preferred embodiment of the present invention.

FIG. 7 is a schematic diagram of a key group of a display device according to a preferred embodiment of the present invention.

FIG. 8 is a schematic diagram of the assembly of the button group, the side shell and the rear shell in a preferred embodiment of the present invention.

FIG. 9 is a schematic diagram of a wireless transmission module of a display device according to a preferred embodiment of the present invention.

FIG. 10 is a schematic diagram of a speaker of a display device according to a preferred embodiment of the present invention.

Label description

1 Display device

10 Front shell

11 Hollow part

12 inner edge

13 outer edge

14 The first buckle

15 Display module

16 Display surface

17 Support structure

18 Second buckle

19 Substrate

20 The third buckle

21 rear case

22a, 22b The fourth buckle

23a, 23b Fifth buckle

24a, 24b First positioner

25a, 25b Second locator

26a, 26b Third locator

27a, 27b Fourth positioning member

28a, 28b Side shells

29a, 29b The sixth buckle

30a, 30b The seventh buckle

31 The fifth positioning part

32a, 32b Sixth locator

33 Wireless transmission module

34 Wireless transmission substrate

341 mirror group

342 slots

343 jack

35 The eighth buckle

36 The seventh positioning piece

37 Guide groove

38 Chamfer

39 Input and output terminals

40 Terminal hole

41 Terminal positioning plate

42 Speaker

43 Fixed plate

44 The first fixing part

45 Second Fixing Part

46 The first elastic element

47 Second elastic element

48 Button group

49 key

50 sensor

51 The third elastic element

52 Arriving at the pillar.

detailed description

Please also refer to Figures 1 to 10. As shown in FIG. 1 , the display device 1 includes a front case 10 , a display module 15 , a support structure 17 , a substrate 19 , a rear case 21 , side cases 28 a and 28 b , a wireless transmission module 33 , a speaker 42 and a key set 48 . As shown in FIG. 2 , the front shell 10 has a hollow portion 11 , an inner edge 12 and an outer edge 13 , the inner edge 12 surrounds and is adjacent to the hollow portion 11 , and the outer edge 13 is away from the hollow portion 11 . The front shell 10 has a first buckle 14 (as shown in Figure 2), a third buckle 20 (as shown in Figures 2a and 2b) and a fifth buckle 23a (as shown in Figure 2a) With the fifth buckle 23b (as shown in Figure 2c). The first buckle 14 is located on the inner edge 12, the third buckle 20 is located between the outer edge 13 and the inner edge 12, and the fifth buckle 23a and 23b are located on the outer edge 13 and are located on the top and bottom of the front shell 10 respectively. , the detailed structure is described later. The display module 15 has a display surface 16 (as shown in FIG. 1 ), wherein the first buckle 14 engages the edge of the display module 15 and the display surface 16 is disposed corresponding to the hollow portion 11 .

The bottom of the front shell 10 is provided with the above-mentioned third buckle 20 and fifth buckle 23a (as shown in Figure 2a), and also provided with the first positioning piece 24a, the third positioning piece 26a and the first elastic element 46 (as shown in Figure 2a). Among them, the third buckle 20 is a hook, the fifth buckle 23a is a slot, the first positioning piece 24a is a positioning column, and the third positioning piece 26a is a positioning plate and is located on the outer edge 13 (as shown in FIG. 2 ). shown), the thickness of the positioning plate decreases towards the direction of the free end. The first elastic element 46 is a shrapnel, one end of which is fixed to the front shell 10 and the other end is a free end, which is suspended in the air and slightly bent.

As shown in Figure 2b and Figure 2c, the top of the front case 10 is provided with a third buckle 20 (as shown in Figure 2b), a fifth buckle 23b (as shown in Figure 2c), a first The positioning piece 24b and the third positioning piece 26b (as shown in Figure 2b). Wherein, the fifth buckle part 23b is a card slot, the first positioning part 24b is a positioning column, the third positioning part 26b is located on the outer edge 13 (as shown in Figure 2) and the third positioning part 26b is a positioning plate, the positioning The thickness of the plate decreases towards the free end.

The front shell 10 also has an eighth buckle 35, a seventh positioning piece 36, a second elastic element 47 and a first fixing piece 44 (as shown in Figure 2d), the eighth buckle 35 is a hook, and the seventh The positioning piece 36 has a guide groove 37, and the opening of the guide groove 37 has a chamfer 38. The second elastic element 47 is a shrapnel, one end of which is fixed to the front shell 10 and the other end is a free end, which is suspended in the air and slightly bent. , the first fixing member 44 is a cylinder and a wing extending from the cylinder.

The rear case 21 has fourth buckle parts 22a and 22b and a supporting column 52 (as shown in FIG. 3 ). (As shown in Figure 3a), the fourth positioning piece 27a is a positioning groove, the width of which is increasing toward the opening of the positioning groove, and the thickness of the positioning plate of the third positioning piece 26a (as shown in Figure 2a) is the same as that of the positioning plate of the third positioning piece 26a. The widths of the positioning slots of the four positioning members 27a correspond to each other.

The top of the rear shell 21 is provided with a fourth buckle 22b and a fourth positioning piece 27b (as shown in Figure 3b), the fourth positioning piece 27b is a positioning groove, and the width of the positioning groove increases toward the direction of the opening of the positioning groove. The thickness of the positioning plate of the third positioning member 26b (as shown in Figure 2b) corresponds to the width of the positioning groove of the fourth positioning member 27b. The side of the rear shell 21 is provided with seventh buckle parts 30a, 30b and a sixth positioning part 32a (as shown in Figure 3b), the seventh buckle part 30a is a clamping plate, and the seventh buckle part 30b is a locking block , wherein the front shell 10 and the rear shell 21 are docked and engaged, and the side shells 28a and 28b are engaged with the sides of the front shell 10 and the rear shell 21 (as shown in Figure 1), and the front shell 10 also has a seventh buckle (not marked) and its position is opposite to the seventh buckle 30a, 30b of the rear shell 21. The sixth positioning piece 32a (as shown in Figure 3b) is a positioning hole. The rear shell 21 is penetrated with a terminal hole 40 in the middle (as shown in Figure 3c), and the rear shell 21 is extended in the direction of the front shell 10 near the terminal hole 40 (see Figure 1). There is a terminal positioning plate 41.

As shown in Figure 4, after the display module 15 is engaged and fixed with the front case 10, the support structure 17 is also engaged with the front case 10 and is located behind the display module 15 relative to the display surface 16 (see Figure 1 for cooperation). , the support structure 17 is engaged with a substrate 19, and the substrate 19 is used to electrically connect the display module 15, so as to drive and control the display module 15. The top and the bottom of the support structure 17 have a second buckle 18 (as shown in Figure 4), and the bottom of the support structure 17 is also provided with a second positioning member 25a (as shown in Figure 4a), the support structure 17 The top is also provided with a second positioning piece 25b (as shown in Figure 4b). Wherein, the second buckle 18 corresponds to the third buckle 20 and can be fixedly engaged with each other (as shown in FIG. 4b ), and the second buckle 18 is a slot.

When assembling, first align the support structure 17 with the predetermined position of the front shell 10 and then press down (see Figure 4 for cooperation). Since the third buckle 20 is made of plastic material and has elasticity, the third buckle 20 can be bent slightly The hook can pass through the second buckle 18 until the hook returns to its original position due to elasticity after passing through the slot, so as to engage and fix each other. The second buckle 18 is limited in width, which can avoid plastic deformation of the third buckle 20 due to excessive bending. In other embodiments, the second buckle can also be a hook, and the third buckle can be changed into a slot. In this embodiment, the front shell 10, the supporting structure 17, the rear shell 21, and the side shells 28a, 28b are all made of plastic material, and the engaging structures on them are integrally formed and also made of plastic material. There is, but is not limited to, some degree of elasticity beyond its elastic limit.

The second positioning piece 25a (as shown in Figure 4a) is a hollow cylinder with a positioning hole at its central axis, the positioning hole corresponds to the positioning column of the first positioning piece 24a, and the second positioning piece 25a and the first positioning piece The parts 24a can be nested and positioned with each other; in addition, the second positioning part 25b (as shown in Figure 4b) is a positioning hole with an opening on one side, and the first positioning part 24b is a positioning column (as shown in Figure 4b).

When assembling the support structure 17 to the front case 10, the first positioning piece 24b is snapped into the positioning hole from the opening side of the second positioning piece 25b by inserting the support structure 17 obliquely relative to the front case 10, and then the The support structure 17 is rotated to face the front shell 10, and the first positioning piece 24b and the second positioning piece 25b, as well as the first positioning piece 24a and the second positioning piece 25a (as shown in FIG. 4a ), are positioned in cooperation with each other. Push the support structure 17 toward the front shell 10 until the third buckle 20 and the second buckle 18 are engaged with each other (as shown in Figures 4, 4a and 4b), and the assembly is completed. With such a structure, there are Helps improve the convenience and accuracy of assembly. In other embodiments, the first positioning member can be a positioning hole and the second positioning member is a positioning post. After the support device 17 is assembled on the front shell 10, the free end of the first elastic element 46 will abut against the support structure 17 (as shown in Figure 4a), which is equivalent to clamping and supporting the first elastic element 46 and the third buckle 20 The structure 17 makes the connection between the support structure 17 and the front shell 10 more robust.

The side shells 28a (as shown in Fig. 5) and 28b (as shown in Fig. 6) have sixth buckle parts 29a and 29b, and the sixth buckle part 29a is a hook, which is used to connect with the seventh buckle part. 30a engage with each other (as shown in Figure 6); the sixth buckle 29b is a locking hole, which is used to engage with the seventh buckle 30b (as shown in Figure 6); the side shells 28a and 28b Connected between the front shell 10 and the rear shell 21. The side shells 28a and 28b have a fifth positioning piece 31 (as shown in Figures 5 and 6), the fifth positioning piece 31 is a positioning column, and the fifth positioning piece 31 and the sixth positioning piece 32a are nested and positioned with each other (such as shown in Figure 6).

The button group 48 (as shown in Figure 7) is used to install on the side shell 28a (as shown in Figure 5 and Figure 8), and the button group 48 includes a button 49 and a sensor 50 (as shown in Figure 7 ), the sensor 50 is installed behind the button 49 and it can be a pressure sensor, but not limited thereto. One side of the button 49 has a third elastic element 51 and one end of the button 49 has a sixth positioning member 32b (as shown in Figure 7). The third elastic element 51 is a shrapnel, one end of which is fixed to the button 49 and the other end is a free end, the free end is suspended and slightly bent. When assembled, the sixth positioning piece 32b is a positioning hole and is aligned with one of the sixth positioning pieces 32a (as shown in Figure 3b), and one of the fifth positioning pieces 31 will pass through the sixth positioning pieces 32a and 32b at the same time. (As shown in Fig. 8, where the sixth positioning member 32a is blocked) and are nested and positioned with each other. Cooperating with the above-mentioned engaging structure, the side shell 28a, the front shell 10, the rear shell 21 and the button group 48 can be locked and fixed with each other. The free end of the third elastic element 51 can push against the front shell 10 (as shown in Figure 8, the front shell 10 is removed in the figure for the convenience of illustration), so that the button group 48 can be connected with the side shell 28a and the front shell 10. And the connection relationship between the back shell 21 is closer. In other embodiments, the fifth positioning piece can be a positioning hole, the sixth positioning piece arranged on the button is still a positioning hole, and the sixth positioning piece arranged on the side of the front shell or the rear shell is changed to a positioning hole. column.

The wireless transmission module 33 has a wireless transmission substrate 34 and a mirror group 341 (as shown in FIG. 9 ), the wireless transmission substrate 34 is provided with a slot 342 , and the mirror group 341 is provided with a jack 343 . The wireless transmission module 33 is used for receiving wireless signals. For example, the signal sent by the remote controller will pass through the lens group 341 and be received by the wireless transmission substrate 34 . When assembling, align the jack 343 with the seventh positioning member 36, install the lens group 341 to the front case 10 (as shown in Figure 9 and Figure 2d), and then insert the wireless transmission substrate 34 obliquely with the chamfer 38 The opening of the guide groove 37, and then enter along the guide groove 37 until the slot 342 is plugged into the bottom of the guide groove 37. At the same time, the eighth buckle 35 will be engaged with the rear end of the wireless transmission substrate 34, and the The free ends of the two elastic elements 47 will abut against the front end of the wireless transmission substrate 34 , so that the wireless transmission module 33 can be closely engaged and fixed with the front shell 10 .

The loudspeaker 42 has a fixing plate 43 (shown in Figure 10), a first fixing part 44 of the front shell 10 (shown in Figure 2d) and a second fixing part 45 of the rear shell 21 (shown in Figure 3a) Corresponding to each other, they are used to cooperate with each other to clamp the fixing plate 43 . When the loudspeaker 42 is assembled with the front case 10 and the rear case 21 (see Figures 2d, 3a, 4 and 10 for cooperation), the fixing plate 43 of the loudspeaker 42 is first aligned with the cylindrical part of the first fixing part 44 and inserted so that the first The wings of the fixing part 44 abut against one side of the fixing plate 43 , and when the rear case 21 is finally assembled, the second fixing part 45 is crimped on the other side of the fixing plate 43 , so that the speaker 42 is clamped and fixed.

When assembling the front shell 10 and the rear shell 21, first align the third positioning pieces 26a and 26b (as shown in Figures 2a and 2b) and insert them into the fourth positioning pieces 27a and 27b (as shown in Figures 3a and 3b) The thickness of the positioning plates of the third positioning parts 26a and 26b and the width of the positioning grooves of the fourth positioning parts 27a and 27b cooperate with each other so that they can be inserted and positioned, so that the front shell 10 and the rear shell 21 can be engaged with each other. Maintain precise positioning until the fourth buckle parts 22a and 22b (as shown in Figures 3a and 3b) and the fifth buckle parts 23a and 23b (as shown in Figures 2a and 2c) are engaged and fixed with each other, so that the front The shell 10 is connected to the rear shell 21. The cooperation between the third positioning parts 26 a and 26 b and the fourth positioning parts 27 a and 27 b can also increase the connection tightness between the front case 10 and the rear case 21 . In other embodiments, the fourth buckle can also be changed into a slot, and the fifth buckle can be changed into a hook.

The substrate 19 has input and output terminals 39 (as shown in FIG. 4 ). After the rear shell 21 and the front shell 10 (as shown in FIG. 1 ) are assembled, one end of the input and output terminals 39 will pass through the terminal hole 40 (As shown in FIG. 3c and FIG. 4 ), and the terminal positioning plate 41 is adjacent to the input and output terminals 39 to help positioning, and the terminal positioning plate 41 also has the function of supporting the rear shell 21 . In addition, the post 52 (as shown in FIG. 3 ) of the rear case 21 is crimped to the rear surface of the display module 15 (as shown in FIG. 4 ) to help fix and support the display module 15 .

To sum up, the present invention proposes a screwless display device, which can easily, properly and quickly install the front case, display and The module, support structure, base plate, side case, button group, wireless transmission module and rear case are snapped and fixed in sequence to complete the assembly. Compared with the prior art, the present invention can simplify the assembling process and improve the convenience of assembling, thereby reducing working hours and manpower consumption, and reducing production costs.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in this art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of protection of an invention shall be defined by the claims.

Claims (9)

1. A screwless display device, comprising: A front shell (10) has a hollow portion (11), an inner edge (12) and an outer edge (13), the inner edge (12) surrounds and is adjacent to the hollow portion (11), the outer edge (13) ) away from the hollow part (11), the front shell (10) has a first buckle (14), and the first buckle (14) is located on the inner edge (12); A display module (15) having a display surface (16), wherein the first buckle (14) engages the edge of the display module (15) and the display surface (16) corresponds to the hollow portion (11) set up; A support structure (17) has a second buckle (18) and is provided with a substrate (19), the substrate (19) is electrically connected to the display module (15), and the front case (10) also has a first Three fasteners (20), the third fastener (20) is located between the outer edge (13) and the inner edge (12), the second fastener (18) and the third fastener (20) snap into each other; and A rear shell (21) has a fourth buckle (22a, 22b), the front shell (10) also has a fifth buckle (23a, 23b), and the fifth buckle (23a, 23b ) is located on the outer edge (13), the fourth buckle (22a, 22b) and the fifth buckle (23a, 23b) are engaged with each other, and the front shell (10) is connected to the rear shell (21); Wherein, the front case (10) also has a first positioning piece (24a, 24b) and a first elastic element (46), and the support structure (17) also has a second positioning piece (25a, 25b), the One of the first positioning piece (24a, 24b) and the second positioning piece (25a, 25b) is a positioning column, and the first positioning piece (24a, 24b) and the second positioning piece (25a, 25b) The other one is a positioning hole, the first positioning piece (24a, 24b) and the second positioning piece (25a, 25b) are fitted and positioned with each other, and one end of the first elastic element (46) is against the supporting structure ( 17). 2. The screwless display device according to claim 1, wherein one of the third buckle (20) and the second buckle (18) is a hook, and the third buckle The other one of (20) and the second buckle (18) is a slot; one of the fifth buckle (23a, 23b) and the fourth buckle (22a, 22b) is The hook, the other of the fifth buckle (23a, 23b) and the fourth buckle (22a, 22b) is a slot. 3. The screwless display device according to claim 1, wherein the front case (10) further has a third positioning piece (26a, 26b), and the third positioning piece (26a, 26b) is located on the outer edge (13), the rear case (21) also has a fourth positioning piece (27a, 27b), one of the third positioning piece (26a, 26b) and the fourth positioning piece (27a, 27b) is positioned plate, the other one of the third positioning piece (26a, 26b) and the fourth positioning piece (27a, 27b) is a positioning groove, and a thickness of the positioning plate decreases toward the direction of the free end of the positioning plate, and the positioning groove A width increases towards the opening direction of the positioning groove, the thickness and the width correspond to each other, and the third positioning piece (26a, 26b) and the fourth positioning piece (27a, 27b) are inserted and positioned with each other. 4. The screwless display device according to claim 1, further comprising a side shell (28a, 28b), the side shell (28a, 28b) has a sixth buckle (29a, 29b), the front shell (10) and the rear shell (21) are respectively provided with a seventh buckle (30a, 30b), and the sixth buckle (29a, 29b) and the seventh buckle (30a, 30b) are engaged with each other , the side shells (28a, 28b) are connected between the front shell (10) and the rear shell (21). 5. The screwless display device according to claim 4, wherein, the side shell (28a, 28b) also has a fifth positioning piece (31), and the rear shell (21) also has a sixth positioning piece ( 32a, 32b), one of the fifth positioning piece (31) and the sixth positioning piece (32a, 32b) is a positioning column, and the fifth positioning piece (31) and the sixth positioning piece (32a, 32b) ) is a positioning hole, and the fifth positioning piece (31) and the sixth positioning piece (32a, 32b) are nested and positioned with each other. 6. The screwless display device according to claim 1, further comprising a wireless transmission module (33), the wireless transmission module (33) has a wireless transmission substrate (34), and the front case (10) also has a The eighth buckle (35) and a seventh positioning piece (36), the eighth buckle (35) is a hook, the seventh positioning piece (36) has a guide groove (37), the wireless transmission The base plate (34) is inserted into the guide groove (37) and engaged and fixed with the eighth buckle (35). 7. The screwless display device according to claim 6, wherein the front case (10) further has a second elastic element (47), and one end of the second elastic element (47) abuts against the wireless transmission substrate (34), the eighth buckle (35) engages the rear end of the wireless transmission substrate (34). 8. The screwless display device according to claim 1, wherein the substrate (19) has an input and output terminal (39), the rear case (21) is penetrated with a terminal hole (40), and the rear The shell (21) extends towards the direction of the substrate (19) and is provided with a terminal positioning plate (41), one end of the input and output terminal (39) is passed through the terminal hole (40), and the terminal positioning plate (41) is adjacent to The input and output terminals (39). 9. The screwless display device according to claim 1, further comprising a speaker (42), the speaker has a fixing plate (43), and the front case (10) also has a first fixing member (44), The rear shell (21) also has a second fixing piece (45), the first fixing piece (44) abuts against one side of the fixing plate (43), and the second fixing piece (45) abuts against the fixing plate The other side of (43).