Military display module with low temperature resistance and high stability

Abstract

The utility model discloses a military display module with low temperature resistance and high stability. The military display module comprises a bearing piece, a conductive frame, an elastic conductive layer and a display module composed of a backlight assembly, heating glass and a display screen. By arranging the elastic conductive layer on the conductive frame around the display window, no matter whether the metal frame is flat or not, the tight fitting and electric contact performance of the ITO conductive coating arranged on the surface of the display screen and the metal frame can be guaranteed, and therefore the electromagnetic shielding reliability is guaranteed; by arranging the heating glass and arranging the ITO conductive coating on the surface of the display screen, the heating glass and the ITO conductive coating can heat the display screen after being electrified, so that the low-temperature resistance of the display module is improved, the ITO conductive coating can shield electromagnetic interference, and the electromagnetic interference resistance can be further improved; the positioning structures are arranged on the metal frame and the protection frame, so that the assembly precision and the assembly efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of display, in particular to a military display module, in particular to a low-temperature-resistant and high-stability military display module. Background Art

[0002] As an interactive interface of electronic devices, the display screen is an essential component. Electronic devices, especially display modules, have poor anti-fall and shock resistance, and are difficult to adapt to harsh environments, especially military environments, where vibrations and impacts are more frequent. Due to structural problems, existing military display modules will affect the normal use of the display screen when subjected to vibrations and impacts, and are also prone to damage glass components during assembly. In addition, although LCD screens have many advantages such as low cost and mature technology, they have a fatal disadvantage, which is the small operating temperature range. Once in a low temperature environment, the liquid crystal is frozen and cannot be used. Therefore, how to improve the temperature range of LCD screens is also a topic worth studying.

[0003] The applicant's prior application CN109765709A discloses a military low-temperature resistant display module, including a PCB circuit board, a liquid crystal screen, a backlight assembly and an outer frame. The liquid crystal screen is provided with an ITO conductive coating. The liquid crystal screen and the backlight assembly are fixed together in sequence by gluing and then installed on the PCB circuit board through a buffer layer. The outer frame is a groove-type frame that can accommodate the liquid crystal screen. The outer frame is installed on the PCB circuit board by snap-fitting. A display window is provided in the middle of the outer frame for exposing the display area of ​​the liquid crystal screen. Pins for installation and connection are provided on the back of the PCB circuit board. Bolt fixing holes are provided on the PCB circuit board at one end of the pins. An elastic plate is provided on the outer frame at the end opposite to the pins. Bolt fixing holes are provided on the elastic plate. The entire military display module can be fixed on the base through two sets of bolt fixing holes. This technology is one of the first-generation series of products of our company. Some problems were gradually found in the production and use of this series of products. For example, as the use time increases or the metal frame is not flat enough, there will be gaps between the transparent conductive film on the surface of the LCD screen and the conductive contact with the metal frame, which may cause magnetic leakage. In some extreme cases, it cannot meet the requirements of high-performance electromagnetic shielding. In addition, during the assembly process, the LCD screen is a glass device, and a gap must be reserved around the side walls of the LCD screen and the metal frame. If the gap is too small, it will cause assembly difficulties. If the gap is too large, the relative position of the LCD screen and the metal frame will be more random during manual assembly, that is, the assembled product consistency is poor. Especially before tightening the twisting foot of the metal frame, the LCD screen and the metal frame are active due to the gap, and the twisting and tightening requires the entire module to be turned over. In this process, it is very easy to cause the LCD screen and the metal frame to move relative to each other. This misalignment aggravates the inconsistency of the product, and there is a certain probability that the ITO conductive coating will be misaligned or wrinkled, so that the electromagnetic shielding performance and heating performance cannot meet expectations; therefore, some new technologies are urgently needed to solve these problems. On the basis of solving these problems, the applicant has updated all the series of products and formed a series of patent applications. Utility Model Content

[0004] The main purpose of the utility model is to provide a low temperature resistant and highly stable military display module, aiming to improve the tightness of the connection between components in the prior art military display module during assembly and use, thereby improving the overall stability. Another purpose of the utility model is to solve the problem of low positioning accuracy of the display screen and the metal frame during the assembly process of the prior art military display module.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A low temperature resistant and highly stable military display module, comprising:

[0007] bearing member;

[0008] The conductive frame is provided with at least one display window;

[0009] An elastic conductive layer is disposed on the bottom frame around the display window; and

[0010] The display module comprises a backlight assembly, a heating glass and a display screen which are sequentially installed, wherein the display screen is attached to the elastic conductive layer and aligned with the display window, and an ITO conductive coating is provided on the surface of the display screen aligned with the display window;

[0011] The conductive frame is detachably connected and buckled on the carrier, so that the display module is wrapped in the space between the conductive frame and the carrier to form a display module.

[0012] Furthermore, a temperature sensor or a thermistor is disposed on the surface of the display screen, and the heating power of the ITO conductive coating is controlled by the temperature sensor or the thermistor.

[0013] Furthermore, the conductive frame includes a bottom frame and side frames located around the bottom frame, the display window is arranged on the bottom frame, at least one side frame is provided with a plurality of positioning holes, the display screen is provided with a protective frame wrapping around it, and the protective frame is provided with positioning blocks corresponding to the positioning holes.

[0014] Furthermore, the positioning block is a wedge-shaped block protruding laterally, and the thickness of the wedge-shaped block increases in a direction away from the bottom frame, and a clamping surface in contact with the edge of the positioning hole is formed at the end with the maximum thickness.

[0015] Furthermore, the protection frame is a plastic basket, and the positioning block is integrally formed with the protection frame.

[0016] Furthermore, the conductive frame is a metal frame, the side frames are metal thin plates, and gaps are arranged between adjacent side frames, so that the side frames have the elasticity to be able to slightly deform outwards.

[0017] Furthermore, the elastic conductive layer is conductive foam, and the conductive foam is attached to the bottom frame around the display window by adhesive.

[0018] Furthermore, a buffering and shock-absorbing layer is arranged between the display module and the circuit board.

[0019] Furthermore, the carrier is a circuit board, a fixing hole is provided on the circuit board, and a twist pin for connecting with the fixing hole is provided on the side frame.

[0020] Furthermore, a fixing block matched with the twist foot is provided on one side of the fixing hole, and the fixing block is provided with a slight slope.

[0021] The beneficial effects of the utility model are:

[0022] 1. In the utility model, by adding an elastic conductive layer, whether the conductive frame is flat or not, the ITO conductive coating on the surface of the display screen can be closely fitted and electrically contacted with the conductive frame, thereby ensuring the reliability of electromagnetic shielding; by arranging a heating glass and an ITO conductive coating on the surface of the display screen, on the one hand, the heating glass and the ITO conductive coating can heat the display screen after power is turned on, thereby improving the low temperature resistance of the display module; on the other hand, the ITO conductive coating can shield electromagnetic interference, which can further improve the electromagnetic interference resistance of the display module of the utility model.

[0023] 2. The utility model can effectively prevent the display screen from being damaged during the assembly process by providing a protection frame outside the display screen; by providing positioning structures on the conductive frame and the protection frame, the protection frame can be positioned with the metal frame with high precision during the assembly process, thereby preventing the relative displacement of the two during the assembly process from affecting the product consistency and electromagnetic shielding performance.

[0024] 3. The utility model uses the conductive foam as an elastic conductive layer to make a non-rigid contact between the display screen and the conductive frame, thereby improving the impact resistance of the display module. The extrusion force generated when the conductive frame is installed on the carrier by twisting the feet will deform the conductive foam and generate a pre-tightening force, thereby improving the seismic performance. The conductive foam can not only deform and fit tightly to improve the electromagnetic shielding performance, but also provide shock absorption performance; at the same time, with the positioning of the positioning blocks and positioning holes, the installation is accurate, the yield rate is high, and the protection performance of the display screen is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the low-temperature-resistant and high-stability military display module of the utility model;

[0026] Figure 2 This is a schematic diagram of the decomposition of the low-temperature resistant and high-stability military display module of the utility model;

[0027] Figure 3 This is a side view of the low temperature resistant and high stability military display module of the utility model;

[0028] Figure 4 for Figure 3 Middle AA section view;

[0029] Figure 5 for Figure 4 A is a partial enlarged schematic diagram;

[0030] Figure 6 This is a schematic diagram of the display screen of the utility model;

[0031] Figure 7 It is a schematic diagram of the conductive frame of the utility model.

[0032] 100-bearing member, 110-fixing hole, 120-fixing block;

[0033] 200-conductive frame, 210-bottom frame, 211-display window, 220-side frame, 221-positioning hole, 222-cable hole, 223-twist foot, 224-gap;

[0034] 300- elastic conductive layer;

[0035] 400-display module, 410-backlight assembly, 420-heating glass, 430-display screen, 431-ITO conductive coating, 432-protection frame, 433-positioning block, 434-cable;

[0036] 500- shock absorbing layer. DETAILED DESCRIPTION

[0037] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] like Figure 1 , Figure 2 and Figure 6 As shown, the utility model provides a low temperature resistant and high stability military display module, comprising:

[0041] Carrier 100;

[0042] The conductive frame 200 is provided with at least one display window 211;

[0043] An elastic conductive layer 300 is disposed on the conductive frame 200 around the display window 211; and

[0044] The display module 400 includes a backlight assembly 410, a heating glass 420 and a display screen 430 which are installed in sequence. The display screen 430 is attached to the elastic conductive layer 300 and aligned with the display window 211. The surface of the display screen 430 aligned with the display window 211 is provided with an ITO conductive coating 431;

[0045] The conductive frame 200 is detachably connected and buckled onto the carrier 100 , so that the display module 400 is wrapped in the space between the conductive frame 200 and the carrier 100 to form a display module.

[0046] The utility model sets an elastic conductive layer 300 between the conductive frame 200 and the ITO conductive coating 431 set on the surface of the display screen 430, and uses the deformable characteristics of the elastic conductive layer 300 to ensure the close contact between the ITO conductive coating 431 and the conductive frame 200. On the one hand, it can improve the sealing of the low-temperature resistant and high-stability military display module of the present application to ensure the performance of use. On the other hand, it can improve the reliability of electromagnetic shielding and avoid the problem of loose connection between the display screen 430 and the conductive frame 200 due to deformation of the conductive frame 200 and loose assembly, thereby causing the electromagnetic shielding performance to decrease. In addition, by setting a deformable elastic conductive layer 300, direct rigid contact between the display screen 430 and the conductive frame 200 is avoided, and the anti-seismic performance of the utility model is improved through flexible contact. In addition, by setting a heating glass 420 and setting an ITO conductive coating 431 on the surface of the display screen 430, on the one hand, the heating glass 420 and the ITO conductive coating 431 can heat the display screen 430 after being powered on, thereby improving the low temperature resistance of the display module. On the other hand, the ITO conductive coating 431 can shield electromagnetic interference, which can further improve the anti-electromagnetic interference performance of the display module of the utility model.

[0047] As a preferred embodiment, the ITO conductive coating 431 is manufactured by coating a layer of indium tin oxide film on the surface of the display screen 430 by sputtering, evaporation or other methods.

[0048] As a preferred embodiment, the square resistance of the ITO conductive coating 431 is less than 16 ohms, the ITO conductive coating 431 is connected to the flexible circuit board of the thermistor assembly through a heating wire, and the heating is controlled by a temperature control module provided on the flexible circuit board.

[0049] As a preferred embodiment, a temperature sensor or a thermistor may be provided on the surface of the liquid crystal screen to control the heating power of the ITO conductive coating 431 through the temperature sensor or thermistor, thereby controlling the operating temperature range of the display module.

[0050] In some embodiments, Figure 2 As shown, a heating glass 420 is arranged between the carrier 100 and the display module 400 . The heating glass 420 and the display screen 430 are fixed by gluing. When the heating glass 420 is powered on, the display screen 430 can be heated, thereby further improving the low temperature resistance of the display screen 430 .

[0051] In some embodiments, Figure 2 and Figure 7 As shown, the conductive frame 200 includes a bottom frame 210 and side frames 220 located around the bottom frame 210, the display window 211 is arranged on the bottom frame 210, at least one side frame 220 is provided with a plurality of positioning holes 221, and the display screen 430 is provided with a protective frame 432 that wraps around it, and the protective frame 432 is provided with positioning blocks 433 corresponding to the positioning holes 221. The display screen 430 is wrapped around by the protective frame 432, so that the display screen 430 is prevented from directly contacting the conductive frame 200 around it, and the display screen 430 is effectively prevented from being damaged during the assembly process; in addition, the utility model provides the cooperation of the positioning blocks 433 and the positioning holes 221, so that during assembly, the display screen 430 and the conductive frame 200 can be accurately positioned, and the relative displacement of the display screen 430 and the conductive frame 200 during the assembly process is effectively prevented.

[0052] like Figure 2 and Figure 5 As shown, as a preferred embodiment, the positioning block 433 is a wedge-shaped block protruding laterally, and the thickness of the wedge-shaped block increases in the direction away from the bottom frame 210, and a snap-fitting surface in contact with the edge of the positioning hole 221 is formed at the end with the maximum thickness; by setting the wedge-shaped positioning block 433, no additional tools are required, so that the positioning block 433 can be easily snapped into the positioning hole 221 according to the wedge-shaped guide.

[0053] In some preferred embodiments, each side frame 220 is provided with at least one positioning hole 221, and the number and position of the positioning blocks 433 are arranged corresponding to the positioning holes 221, so that the display screen 430 can be completely positioned on all sides, for example Figure 7 In the embodiment, two positioning holes 221 are provided on each side frame 220 .

[0054] In some embodiments, Figure 2 and Figure 5As shown, the protection frame 432 is a plastic basket, and the positioning block 433 is integrally formed with the protection frame 432. The plastic basket is low in cost, can provide good protection, and is easy to form. The plastic basket itself can be fixed around the display screen 430 by gluing. Of course, as a basic common sense, the plastic basket must also be provided with an outlet for the display screen 430 cable.

[0055] In some embodiments, participating Figure 7 As shown, the conductive frame 200 is a metal frame, the side frame 220 is a metal sheet, and a gap 224 is arranged between adjacent side frames 220, so that the side frame 220 has the elasticity to be slightly deformed outward, so that in the process of assembling the protection frame 432, when the wedge block squeezes the side frame 220, the side frame 220 can be slightly deformed outward, and when the wedge block reaches the positioning hole 221, the side frame 220 rebounds quickly, which not only meets the assembly requirements, but also minimizes the gap 224 between the plastic basket and the side frame 220 of the conductive frame 200, thereby improving the relative position assembly accuracy between the display screen 430 and the conductive frame 200, and at the same time making the display screen 430 firmly assembled and improving the seismic performance.

[0056] In some embodiments, Figure 2 As shown, the elastic conductive layer 300 is conductive foam, which is attached to the bottom frame 210 around the display window 211 by gluing. The gluing methods include but are not limited to solid glue, liquid glue, double-sided glue or conductive glue with self-adhesive backing. Using conductive foam as the elastic conductive layer 300 not only meets the requirements but also has low cost.

[0057] In some embodiments, Figure 2As shown, the carrier 100 is a circuit board, specifically a PCB circuit board, the circuit board is provided with a long strip fixing hole 110, the side frame 220 is provided with a twist foot 223 for connecting with the fixing hole 110, and one side of the fixing hole 110 is provided with a fixing block 120 matched with the twist foot 223, and the fixing block 120 is provided with a slight slope. By providing the fixing hole 110, the installation and positioning of the conductive frame 200 and the carrier 100 can be quickly realized by passing the twist foot 223 through the fixing hole 110, further improving the assembly accuracy and assembly efficiency. The utility model realizes a snap connection through the twist foot 223 and the slightly sloped fixed block 120, which is not only convenient for assembly and disassembly and has appropriate tightness, but also will not cause the equipment to be unreliable due to too loose installation, nor will the display screen 430 be damaged due to too tight installation; and by providing the slightly sloped fixed block 120, a pre-tightening force can be provided between the connection between the metal frame and the circuit board, and the snap connection of the utility model is not easy to loosen even if subjected to severe vibration and impact; when twisting the twist foot 223, only a very small twisting angle is needed to achieve the best match between the twist foot 223 and the fixed block 120, and the twisting is more time-saving and labor-saving. Even if the twist foot 223 is used for a long time, it is not easy to break, which can extend the service life.

[0058] In some embodiments, Figure 2 As shown, a buffer and shock absorbing layer 500 is arranged between the display module 400 and the circuit board. The buffer and shock absorbing layer 500 can be a buffer foam to improve the shock resistance. The buffer foam can be a whole piece attached to the back of the backlight assembly 410, or it can be a plurality of small modules, as long as the back of the display module 400 is in flexible contact with the circuit board and is firmly fixed.

[0059] In some embodiments, the side frame 220 of the conductive frame 200 is provided with a plurality of cable holes for leading out the cables 434 of the display screen 430; Figure 7 Taking the middle rectangular frame as an example, the two long side frames 220 of the rectangular frame are respectively provided with a second cable hole 223 for leading out the cable 434 of the display screen 430 .

[0060] The utility model also provides an assembly method of a display module in an optimal embodiment, which is as follows: conductive foam is attached to the four sides of the display window 211 on the bottom frame 210 through conductive glue; an ITO conductive coating 431 is plated on the surface of the display screen 430, a plastic basket is installed around the display screen 430, and the positioning blocks 433 around the protective frame 432 are inserted into the positioning holes 221 of the side frame 220 for snap-fitting and fixing, thereby completing the fixing of the display screen 430 and the conductive frame 200, and then the heated glass 420 is pasted on the surface of the display screen 430 away from the display window 211, and the backlight assembly 410 is installed to form a display assembly, and then the display assembly is turned upside down on the circuit board, the twist foot 223 passes through the fixing block 110 on the circuit board to the back, and the twist foot 223 is twisted so that a micro pressure is generated between the end of the twist foot 223 and the micro-slope fixing block 120, thereby completing the assembly of the low-temperature resistant and high-stability military display module.

[0061] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not deviate from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A low temperature resistant and high stability military display module, characterized in that: include: bearing member; The conductive frame is provided with at least one display window; An elastic conductive layer is arranged on the bottom frame around the display window; as well as The display module comprises a backlight assembly, a heating glass and a display screen which are sequentially installed, wherein the display screen is attached to the elastic conductive layer and aligned with the display window, and an ITO conductive coating is provided on the surface of the display screen aligned with the display window; The conductive frame is detachably connected and buckled on the carrier, so that the display module is wrapped in the space between the conductive frame and the carrier to form a display module.

2. A low temperature resistant and high stability military display module according to claim 1, characterized in that: The surface of the display screen is provided with a temperature sensor or a thermistor, and the heating power of the ITO conductive coating is controlled by the temperature sensor or the thermistor.

3. A low temperature resistant and high stability military display module according to claim 1, characterized in that: The conductive frame includes a bottom frame and side frames located around the bottom frame, the display window is arranged on the bottom frame, at least one side frame is provided with a plurality of positioning holes, the display screen is provided with a protective frame wrapping around it, and the protective frame is provided with positioning blocks corresponding to the positioning holes.

4. A low temperature resistant and high stability military display module according to claim 3, characterized in that: The positioning block is a wedge-shaped block protruding laterally. The thickness of the wedge-shaped block increases in a direction away from the bottom frame, and a clamping surface in contact with the edge of the positioning hole is formed at the end with the maximum thickness.

5. A low temperature resistant and high stability military display module according to claim 4, characterized in that: The protection frame is a plastic basket, and the positioning block is integrally formed with the protection frame.

6. The low temperature resistant and high stability military display module according to claim 3, characterized in that: The conductive frame is a metal frame, the side frame is a metal thin plate, and gaps are arranged between adjacent side frames, so that the side frames have elasticity that allows them to be slightly deformed outward.

7. The low temperature resistant and high stability military display module according to claim 1, characterized in that: The elastic conductive layer is conductive foam, and the conductive foam is attached to the bottom frame around the display window by adhesive.

8. The low temperature resistant and high stability military display module according to claim 7, characterized in that: A buffering and shock-absorbing layer is arranged between the display module and the circuit board.

9. The low temperature resistant and high stability military display module according to claim 3, characterized in that: The bearing member is a circuit board, a fixing hole is arranged on the circuit board, and a twist foot for connecting with the fixing hole is arranged on the side frame.

10. A low temperature resistant and high stability military display module according to claim 9, characterized in that: A fixing block matched with the twist foot is arranged on one side of the fixing hole, and the fixing block is provided with a slight slope.

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