Display device used on rail transit vehicle

Abstract

The utility model relates to a display device used on a rail transit vehicle. The display device comprises an LCD display screen, a middle frame structure, a front frame structure, a rear cover plate and an elastic piece structure. The LCD display screen comprises a display circuit board and an LCD display assembly connected with the display circuit board. The middle frame structure comprises a middle frame plate and a middle frame main frame arranged on the peripheral side of the middle frame plate in a surrounding mode, the LCD display assembly is arranged in a middle frame limiting cavity defined by the middle frame plate and the middle frame main frame, and the display circuit board is arranged on the rear side of the middle frame plate; the front frame structure comprises a front frame main frame arranged outside the middle frame main frame and a front frame plate arranged on the front side of the front frame main frame, and the front frame plate is arranged on the front side of the LCD display assembly; the rear cover plate is arranged outside the middle frame plate and covers the display circuit board; the elastic sheet structure comprises a plurality of metal elastic sheets arranged between the middle frame main frame and the front frame main frame. The liquid crystal display device can solve the problem that the reliability and the stability of a traditional LCD display device are affected due to the fact that a gap between a middle frame structure and a front frame structure is too large.

Description

TECHNICAL FIELD

[0001] The utility model relates to rail transit technical field, especially relate to a display equipment for rail transit vehicle. BACKGROUND

[0002] On the rail transit equipment, usually in its car will set up various LCD (Liquid Crystal Display, liquid crystal display) display equipment. In the current LCD display equipment, the traditional middle frame structure and front frame structure are widely used. These structures after bending process, often face the problem of deformation. Specifically, the traditional middle frame structure and front frame structure in the bending process link face many challenges, the material characteristics used determine that when subjected to bending force, the structure is prone to deformation. For example, the internal lattice structure of metal material is destroyed when subjected to external force bending, stress concentration phenomenon occurs. Moreover, due to the limitation of processing technology, such as the precision of bending equipment, the control precision of bending angle and other factors, this deformation is often difficult to accurately control within a reasonable range. This deformation directly causes the gap between the middle frame structure and the front frame structure to not meet the design expectation. Since the two are in close cooperation, the deformation of either party can break the original spatial layout relationship. For example, the middle frame structure may swell outward or inward after bending deformation, which changes the gap between the middle frame structure and the front frame structure designed according to the accurate size.

[0003] Moreover, in the reliability evaluation system of electronic equipment, EFT (Electrical Fast Transient, Electrical Fast Transient) and ESD (Electro-Static discharge, Electrostatic Discharge Test) test are indispensable parts. The gap between the middle frame structure and the front frame structure caused by the structural defects of the traditional LCD display equipment is too large, which is manifested in the EFT test. When the pulse group is transmitted along the circuit, due to the existence of a larger space at the gap, the pulse signal will scatter, reflect and other phenomena. It is like light on uneven surface will refract, so that the signal cannot reach the target element according to the predetermined path and intensity, thereby interfering with the normal work of the entire circuit system. In terms of ESD test, the gap is too large, which means that the electric charge is more likely to accumulate or produce ionization channel in the gap during electrostatic discharge. This is because the larger gap reduces the path length and contact area of static charge conduction, making it more difficult for static charge to be effectively dissipated or transferred. This leads to the damage of internal circuit elements when the equipment is subjected to electrostatic discharge, affecting the normal operation of the display equipment.

[0004] Further, the stability of the structure and the accuracy of signal transmission of the LCD display device are extremely high. Due to the excessively large gap between the middle frame structure and the front frame structure, the electrical connection line behind the LCD display screen is indirectly affected. A slight change of the signal transmission line can cause signal transmission delay or signal amplitude change, thereby causing color deviation of the display content of the LCD display screen. For example, the electrical signals of red, green and blue colors should be accurately transmitted, but due to interference in the transmission process, the red signal can be slightly enhanced, resulting in a red picture. At the same time, the instability of the mechanical structure also affects the normal work of the LCD display screen. The excessively large gap can cause a slight displacement of the LCD display screen at the fixed position of the device, which is like placing a precision instrument on an uneven support, so that the arrangement of liquid crystal molecules is disturbed, thereby causing screen flicker, snowflakes or more serious display failure.

[0005] From a technical point of view, the generation of such defects is mainly due to the limitations of the traditional middle frame structure and front frame structure in the design and processing process. On the one hand, these structures often use relatively simple materials and designs, which lack sufficient strength and stability to resist deformation during the bending process. On the other hand, the quality control during the processing process is difficult, and it is difficult to ensure that the gap precision of each batch of products meets the design requirements. Therefore, in view of the deficiencies of the prior art, it is particularly urgent and necessary to develop a new technology that can effectively solve the bending deformation problem of the middle frame structure and the front frame structure and improve the reliability and stability of the display device. Practical new type content

[0006] The utility model provides a kind of display device for rail transit vehicle, can solve the technical problem that the gap between middle frame structure and front frame structure is excessively large due to the bending deformation of LCD display device in traditional technology, which affects the reliability and stability of display device.

[0007] To solve the above technical problems, the utility model provides a kind of display device for rail transit vehicle, comprising:

[0008] LCD display screen, including display circuit board, and LCD display component connected with the display circuit board;

[0009] Middle frame structure, including middle frame plate, and middle frame main frame surrounded in the side of the middle frame plate, the middle frame plate and the middle frame main frame are surrounded and form middle frame limiting cavity with front side open, the LCD display component is limited in the middle frame limiting cavity, and the display circuit board is located at the rear side of the middle frame plate;

[0010] The front frame structure comprises a front frame main frame detachably arranged outside the circumferential side of the main frame main frame, and a front frame plate arranged on the front side of the front frame main frame, and the front frame plate is arranged on the four circumferential edges of the front side of the LCD display assembly.

[0011] The rear cover plate is detachably arranged outside the main frame plate and covers the display circuit board;

[0012] The elastic sheet structure comprises a plurality of metal elastic sheets arranged between the outer circumferential side of the main frame main frame and the inner circumferential side of the front frame main frame.

[0013] Optionally, one side of the metal elastic sheet is detachably connected to the outer circumferential side of the main frame main frame, and the other side abuts against the inner circumferential side of the front frame main frame; or,

[0014] The metal elastic sheet abuts against the outer circumferential side of the main frame main frame on one side, and is detachably connected to the inner circumferential side of the front frame main frame on the other side; or,

[0015] The metal elastic sheet is detachably connected to the outer circumferential side of the main frame main frame on one side, and is detachably connected to the inner circumferential side of the front frame main frame on the other side.

[0016] Optionally, one side of the metal elastic sheet is detachably connected to the outer circumferential side of the main frame main frame, and the other side abuts against the inner circumferential side of the front frame main frame.

[0017] Optionally, the main frame main frame comprises a plurality of main frame edges arranged around the circumferential side of the main frame plate, and at least one metal elastic sheet is detachably arranged on each main frame edge.

[0018] Optionally, at least one clamping groove is arranged on each main frame edge, and at least one metal elastic sheet is correspondingly clamped in each clamping groove.

[0019] Optionally, the clamping groove is arranged along the transverse direction or the longitudinal direction of the main frame edge, and the metal elastic sheet is correspondingly clamped in the clamping groove along the transverse direction or the longitudinal direction.

[0020] Optionally, each clamping groove comprises a plurality of clamping sub-grooves arranged on the main frame edge, and a plurality of parts of the metal elastic sheet are correspondingly clamped in the plurality of clamping sub-grooves.

[0021] Optionally, the metal elastic sheet comprises an elastic sheet protruding portion and an elastic sheet clamping portion arranged on one side of the elastic sheet protruding portion, the elastic sheet clamping portion is clamped on the outer circumferential side of the main frame main frame, and the elastic sheet protruding portion abuts against the inner circumferential side of the front frame main frame; or,

[0022] The metal spring sheet comprises a spring sheet protruding part and a spring sheet clamping part arranged on one side of the spring sheet protruding part, the spring sheet clamping part is clamped on the inner circumferential side of the front frame main frame, and the spring sheet protruding part is abutted on the outer circumferential side of the middle frame main frame.

[0023] The metal spring sheet comprises a spring sheet protruding part and a first spring sheet clamping part and a second spring sheet clamping part arranged on two sides of the spring sheet protruding part respectively, the first spring sheet clamping part is clamped on the outer circumferential side of the middle frame main frame, and the second spring sheet clamping part is clamped on the inner circumferential side of the front frame main frame.

[0024] Optionally, the metal spring sheet comprises the spring sheet protruding part arranged in a C-shaped, V-shaped, U-shaped or O-shaped manner, and each spring sheet clamping part is arranged on one side or both sides of the spring sheet protruding part.

[0025] Optionally, the spring sheet protruding part is arranged in a C-shaped protrusion or a V-shaped protrusion, and the spring sheet clamping part comprises a spring sheet clamping hook arranged on each end of the C-shaped protrusion or the V-shaped protrusion.

[0026] The beneficial effects brought by the technical scheme of the utility model include:

[0027] By arranging a plurality of metal spring sheets between the outer circumferential side of the middle frame main frame of the middle frame structure and the inner circumferential side of the front frame main frame of the front frame structure, deformation buffering and gap control of the middle frame structure and the front frame structure can be realized. During the installation process of the display device, the metal spring sheet is subjected to extrusion and elastic deformation. Such elastic deformation can absorb part of the energy and reduce the gap between the front frame structure and the middle frame structure. In the normal state, the metal spring sheet can apply uniform elastic pressure to the front frame structure and the middle frame structure, so as to maintain the gap between the two within a suitable range, for example, the designed gap is 0.3mm, and the metal spring sheet can ensure that the actual gap fluctuates very little around this ideal value.

[0028] In terms of EFT test, the metal material and reasonable structure design of the metal spring sheet can conduct and shield the pulse signal to a certain extent. When the pulse signal propagates along the circuit near the middle frame structure or the front frame structure, the metal spring sheet can serve as an auxiliary signal conduction path to reduce abnormal scattering and reflection of the signal at the gap. For ESD test, the metal spring sheet can connect the middle frame structure and the front frame structure to form a continuous potential conduction path, so that the static charge can be conducted and dispersed between the middle frame structure and the front frame structure more quickly, avoiding the accumulation of charges at these parts and causing damage to the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the premise of not paying creative labor.

[0030] Figure 1 The three-dimensional structure diagram of the display device for the rail transit vehicle according to the embodiment of the present application Figure 1

[0031] Figure 2 The three-dimensional structure diagram of the display device for the rail transit vehicle according to the embodiment of the present application Figure 2

[0032] Figure 3 The exploded structure diagram of the display device for the rail transit vehicle according to the embodiment of the present application

[0033] Figure 4 The cross-sectional structure diagram of the display device for the rail transit vehicle according to the embodiment of the present application

[0034] Figure 5 The three-dimensional structure diagram of the display device for the rail transit vehicle (when the front frame structure is removed) according to the embodiment of the present application

[0035] Figure 6 The three-dimensional structure diagram of the display device for the rail transit vehicle (when the rear cover plate is removed) according to the embodiment of the present application

[0036] Figure 7 The three-dimensional structure diagram of the middle frame structure of the display device for the rail transit vehicle according to the embodiment of the present application Figure 1

[0037] Figure 8 The three-dimensional structure diagram of the middle frame structure of the display device for the rail transit vehicle according to the embodiment of the present application Figure 2

[0038] Figure 9 The three-dimensional structure diagram of the front frame structure of the display device for the rail transit vehicle according to the embodiment of the present application

[0039] Figure 10 The three-dimensional structure diagram of the metal elastic sheet of the display device for the rail transit vehicle according to the embodiment of the present application Figure 1

[0040] Figure 11 ​​​​​The utility model discloses a three-dimensional structure schematic diagram of the metal elastic sheet for the display equipment on the rail transit vehicle Figure 2 .

[0041] In the drawing: 10, the display equipment for rail transit vehicle;100, LCD display screen;110, display circuit board;120, LCD display assembly;200, middle frame structure;210, middle frame board;220, middle frame main frame;222, middle frame edge;224, clamping groove;2242, buckle branch groove;230, middle frame limiting cavity;240, positioning plate;250, middle frame support;300, front frame structure;310, front frame main frame;312, front frame edge;320, front frame board;400, back cover plate;500, elastic sheet structure;510, metal elastic sheet;512, elastic sheet convex part;514, elastic sheet clamping part. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in conjunction with the drawings in the utility model embodiment, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of protection of the utility model.

[0043] As Figures 1 to 4 shown, the utility model provides a kind of display equipment 10 for rail transit vehicle, including LCD display screen, the middle frame structure 200 and back cover plate 400 being surrounded in the week side and rear side (pointing the side of display face of LCD display screen) of LCD display screen, the edge of the front frame structure 300 being surrounded in the week side and LCD display screen of middle frame structure 200 and front side (pointing the side corresponding of display face of LCD display screen), and the elastic sheet structure 500 (as Figures 4 to 6 Shown) being arranged between middle frame structure 200 and front frame structure 300. Through middle frame structure 200, back cover plate 400, front frame structure 300, it is positioned fixed to LCD display screen from week side, rear side and front side, and through elastic sheet structure 500, the gap between middle frame structure 200 and front frame structure 300 can be adjusted, so that the gap between them is kept in reasonable range, guarantee the reliability and stability of display equipment.

[0044] Specifically, as Figures 3 to 6As shown, the LCD display screen 100 can include a display circuit board 110, and an LCD display assembly 120 connected with the display circuit board 110. The display circuit board 110 is integrated with various electronic elements, and is the core control circuit for realizing the display function of the display device, and can be connected with the LCD display assembly 120 through a specific interface. The LCD display assembly 120 is the key display component of the display device, and is supported and fixed by the middle frame structure 200, and relies on accurate internal circuit connection to display images.

[0045] Moreover, as shown, Figures 4 to 8 The middle frame structure 200 can include a middle frame plate 210, and a middle frame main frame 220 surrounding the periphery of the middle frame plate 210. The middle frame plate 210 and the middle frame main frame 220 form a middle frame limiting cavity 230 with the front side open. The LCD display assembly is limited in the middle frame limiting cavity 230, and the display circuit board 110 is arranged on the rear side of the middle frame plate 210. That is, the middle frame main frame 220 can surround the periphery of the LCD display assembly, and the middle frame plate 210 can cover the rear side of the LCD display assembly (i.e., the side facing away from the display surface of the LCD display assembly). The middle frame main frame 220 and the middle frame plate 210 can provide a mounting and fixing basis for the display circuit board 110, the LCD display assembly, the front frame structure 300, and the rear cover plate 400. Moreover, the display circuit board 110 can be arranged on the rear side of the middle frame plate 210, outside the middle frame limiting cavity 230. That is, the display circuit board 110 can be arranged on the outer side of the middle frame plate 210, and the LCD display assembly and the display circuit board 110 can be separated by the middle frame plate 210. Moreover, the rear cover plate 400 can be detachably arranged on the outer side of the middle frame plate 210, and cover the display circuit board 110. That is, the rear cover plate 400 can protect the display circuit board 110. In addition, the middle frame plate 210 can be a solid flat plate, or a hollow frame plate.

[0046] Moreover, as shown, Figures 4 to 8 The front frame structure 300 can include a front frame main frame 310 detachably arranged on the periphery of the middle frame main frame 220, and a front frame plate 320 arranged on the front side of the front frame main frame 310. The front frame plate 320 is limited on the periphery of the front side of the LCD display assembly. The front frame main frame 310 can be detachably connected with the middle frame main frame 220, and the front frame structure 300 and the middle frame structure 200 can be connected together. Moreover, the front frame plate 320 can be a hollow frame plate, and the front frame plate 320 can limit the front side of the LCD display assembly from the periphery, and fix the LCD display assembly. The front frame structure 300 is located on the front side of the middle frame structure 200, and together with the middle frame structure 200 forms the housing frame of the display device. The front frame structure 300 needs to be closely matched with the middle frame structure 200 to ensure the stability of the internal structure while ensuring the appearance of the device.

[0047] Moreover, asFigures 3 to 6 As shown, the spring structure 500 may include multiple metal springs 510 disposed between the outer periphery of the middle frame main frame 220 and the inner periphery of the front frame main frame 310. By providing multiple metal springs 510 between the outer periphery of the middle frame main frame 220 of the middle frame structure 200 and the inner periphery of the front frame main frame 310 of the front frame structure 300, deformation buffering and gap control can be achieved for the middle frame structure 200 and the front frame structure 300. During the installation of the display device, the metal springs 510 are compressed and undergo elastic deformation. This elastic deformation can absorb some energy and reduce the gap between the front frame structure 300 and the middle frame structure 200. Under normal conditions, the metal springs 510 apply uniform elastic pressure to the front frame structure 300 and the middle frame structure 200, thereby maintaining the gap between them within a suitable range. For example, if the designed gap is 0.3mm, the metal springs 510 can ensure that the actual gap fluctuates minimally around this ideal value.

[0048] In EFT testing, the metal spring 510, with its metallic material and rational structural design, can conduct and shield pulse signals to a certain extent. When the pulse signal propagates along the circuit near the middle frame structure 200 or the front frame structure 300, the metal spring 510 can serve as an auxiliary signal conduction path, reducing abnormal scattering and reflection of the signal at the gaps. For ESD testing, the metal spring 510 can connect the middle frame structure 200 and the front frame structure 300, forming a continuous potential conduction path. This allows electrostatic charges to be conducted and dispersed more quickly between the middle frame structure 200 and the front frame structure 300, preventing charge accumulation in these areas and thus avoiding equipment damage.

[0049] Furthermore, such as Figures 3 to 6 As shown, the metal spring 510 can be detachably connected to the outer periphery of the main frame 220 on one side and abutted against the inner periphery of the main frame 310 on the other side. This allows the metal spring 510 to be detachably connected to the main frame 200 on one side and elastically abutted against the front frame 300 on the other side, making the connection simple and convenient. Alternatively, the metal spring 510 can also abut against the outer periphery of the main frame 220 on one side and be detachably connected to the inner periphery of the main frame 310 on the other side. This allows the metal spring 510 to elastically abut against the main frame 200 on one side and be detachably connected to the front frame 300 on the other side, making the connection simple and convenient. Alternatively, the metal spring 510 can also be detachably connected to the outer periphery of the main frame 220 on one side and detachably connected to the inner periphery of the main frame 310 on the other side. This allows the metal spring 510 to be detachably connected to the main frame 200 on one side and detachably connected to the front frame 300 on the other side, making the connection firm and reliable.

[0050] In the embodiment, the metal spring 510 can be buckled on one side to the outer circumferential side of the middle frame main frame 220, and abut on the other side to the inner circumferential side of the front frame main frame 310. That is, the metal spring 510 can be buckled on one side to the middle frame structure 200, and elastically abut on the other side to the front frame structure 300. The metal spring 510 and the middle frame structure 200 are detachably connected by the buckling connection mode, and the connection is simple and convenient. In addition, the metal spring 510 can be abut on one side to the outer circumferential side of the middle frame main frame 220, and buckled on the other side to the inner circumferential side of the front frame main frame 310, or buckled on one side to the outer circumferential side of the middle frame main frame 220, and buckled on the other side to the inner circumferential side of the front frame main frame 310.

[0051] In addition, the metal spring 510 can be detachably connected to the middle frame structure 200 or / and the front frame structure 300 by the buckling connection mode, or can be detachably connected by the screw connection mode. In addition, the metal spring 510 can be detachably connected to the middle frame structure 200 or / and the front frame structure 300, or can be fixedly connected, such as welding, riveting, etc.

[0052] Moreover, as shown in Figures 7 to 8 The middle frame main frame 220 can include a plurality of middle frame edges 222 surrounding the circumferential side of the middle frame plate 210, and at least one metal spring 510 is buckled on each middle frame edge 222. For example, when the middle frame plate 210 is rectangular, the middle frame main frame 220 can include four middle frame edges 222 bent and extended at the four circumferential edges of the middle frame plate 210, and the included angle between each middle frame edge 222 and the middle frame plate 210 can be a right angle. Moreover, the four middle frame edges 222 can be sequentially connected end to end to form a whole, and in addition, the four middle frame edges 222 can be intermittently arranged. One or more (two or more) metal springs 510 can be buckled on each middle frame edge 222 of the four middle frame edges 222, and the four circumferences of the middle frame main frame 220 are elastically connected to the front frame main frame 310. Moreover, the middle of each middle frame edge 222 or / and both sides can be provided with a metal spring 510.

[0053] Correspondingly, as shown in Figure 9 The front frame main frame 310 can include a plurality of front frame edges 312 surrounding the circumferential side of the front frame plate 320, and each front frame edge 312 corresponds to a middle frame edge 222 and elastically abuts with the metal spring 510. Similarly, when the middle frame plate 210 is rectangular, the front frame main frame 310 can include four front frame edges 312 bent and extended at the four circumferential edges of the front frame plate 320, and the included angle between each front frame edge 312 and the front frame plate 320 can be a right angle. Moreover, the four front frame edges 312 can be sequentially connected end to end to form a whole, such as can be overlapped, or welded, or directly integrally arranged between two adjacent front frame edges 312, and can be fully surrounded and fixed from the outside to the middle frame main frame 220.

[0054] Further, as shown in Figures 7 to 8 Further, the clamping groove 224 can be arranged along the transverse direction or the longitudinal direction of the middle frame edge 222, and the metal spring 510 is correspondingly clamped in the clamping groove 224 along the transverse direction or the longitudinal direction. That is, the clamping groove 224 can be arranged along the transverse direction of the middle frame edge 222, and the metal spring 510 is correspondingly clamped in the clamping groove 224 along the transverse direction of the middle frame edge 222; or, the clamping groove 224 can be arranged along the longitudinal direction of the middle frame edge 222, and the metal spring 510 is correspondingly clamped in the clamping groove 224 along the longitudinal direction of the middle frame edge 222. In addition, the clamping groove 224 can be arranged along the oblique direction (neither the transverse direction nor the longitudinal direction) of the middle frame edge 222. Further, the clamping groove 224 can be arranged as a straight groove structure (i.e., including a plurality of slot openings arranged in a straight line), an arc-shaped groove structure (i.e., including a plurality of slot openings arranged in an arc shape), a ring-shaped groove structure (i.e., including a plurality of slot openings arranged in a ring shape), a parallel groove structure (i.e., including a plurality of parallel slot openings), a staggered groove structure (i.e., including a plurality of staggered slot openings), or an irregularly shaped slot opening structure.

[0055] Further, the clamping groove 224 can be arranged along the transverse direction or the longitudinal direction of the middle frame edge 222, and the metal spring 510 is correspondingly clamped in the clamping groove 224 along the transverse direction or the longitudinal direction. That is, the clamping groove 224 can be arranged along the transverse direction of the middle frame edge 222, and the metal spring 510 is correspondingly clamped in the clamping groove 224 along the transverse direction of the middle frame edge 222; or, the clamping groove 224 can be arranged along the longitudinal direction of the middle frame edge 222, and the metal spring 510 is correspondingly clamped in the clamping groove 224 along the longitudinal direction of the middle frame edge 222. In addition, the clamping groove 224 can be arranged along the oblique direction (neither the transverse direction nor the longitudinal direction) of the middle frame edge 222. Further, the clamping groove 224 can be arranged as a straight groove structure (i.e., including a plurality of slot openings arranged in a straight line), an arc-shaped groove structure (i.e., including a plurality of slot openings arranged in an arc shape), a ring-shaped groove structure (i.e., including a plurality of slot openings arranged in a ring shape), a parallel groove structure (i.e., including a plurality of parallel slot openings), a staggered groove structure (i.e., including a plurality of staggered slot openings), or an irregularly shaped slot opening structure.

[0056] Furthermore, each snap-fit ​​groove 224 may include a slot on the middle frame edge 222, into which a portion of the metal spring piece 510 can be snapped. Additionally, each snap-fit ​​groove 224 may also include multiple snap-fit ​​support grooves 2242 on the middle frame edge 222, into which multiple portions of the metal spring piece 510 can be snapped. This allows one or more portions of the metal spring piece 510 to be snapped into one or more slots (i.e., snap-fit ​​support grooves 2242) of a snap-fit ​​groove 224 on the middle frame edge 222, enabling the metal spring piece 510 to be snapped and fixed from one or more positions. Moreover, the multiple slots (i.e., snap-fit ​​support grooves 2242) can be arranged in a straight line, an arc, a ring, parallel, or staggered arrangement, etc.

[0057] Specifically, for example, each snap-fit ​​groove 224 on the middle frame edge 222 may include two snap-fit ​​support grooves 2242 arranged side by side on the middle frame edge 222 in a horizontal or vertical direction (forming a parallel groove structure), and two parts on one side of the metal spring sheet 510 may be snapped into the two snap-fit ​​support grooves 2242 respectively. In addition, each snap-fit ​​groove 224 on the middle frame edge 222 may include a slot arranged in a horizontal or vertical direction on the middle frame edge 222, and one part on one side of the metal spring sheet 510 may be snapped into the slot.

[0058] In addition, each front frame edge 312 of the front frame main frame 310 may be provided with a corresponding limiting groove, which is correspondingly provided with the snap-fit ​​groove 224 on the middle frame edge 222 of the middle frame main frame 220, so that after one side of the metal spring 510 is snapped into the snap-fit ​​groove 224 on the middle frame main frame 220, the other side can be limited in the limiting groove of the front frame main frame 310, making the connection between the front frame main frame 310 and the middle frame main frame 220 tighter and more reliable.

[0059] In addition, such as Figures 10 to 11 As shown, each metal spring 510 may include a spring protrusion 512 and a spring locking portion 514 disposed on one side of the spring protrusion 512. The spring locking portion 514 can be locked onto the outer periphery of the middle frame main frame 220, and the spring protrusion 512 can abut against the inner periphery of the front frame main frame 310. Alternatively, the metal spring 510 may include a spring protrusion 512 and a spring locking portion 514 disposed on one side of the spring protrusion 512. The spring locking portion 514 can be locked onto the inner periphery of the front frame main frame 310, and the spring protrusion 512 abuts against the outer periphery of the middle frame main frame 220. Alternatively, the metal spring 510 may include a spring protrusion 512, and a first spring snap-fit ​​portion 514 and a second spring snap-fit ​​portion 514 respectively disposed on both sides of the spring protrusion 512. The first spring snap-fit ​​portion 514 snaps onto the outer periphery of the middle frame main frame 220, and the second spring snap-fit ​​portion 514 snaps onto the inner periphery of the front frame main frame 310.

[0060] By bending the metal spring 510, the spring protruding portion 512 with elasticity can be formed on the metal spring 510. Moreover, by the spring clamping portion 514 provided on the metal spring 510, the metal spring 510 can be clamped on the middle frame structure 200 and / or the front frame structure 300, and the metal spring 510 can be in abutment with the front frame structure 300 and the middle frame structure 200 or the two spring clamping portions 514 are respectively in elastic clamping with the front frame structure 300 and the middle frame structure 200, so as to elastically adjust the gap between the middle frame structure 200 and the front frame structure 300 by the metal spring 510. Moreover, the spring clamping portion 514 of the metal spring 510 can include one or more clamping sub-portions, and can be clamped one by one with one slot or multiple buckle branch slots 2242 of the clamping slot 224. For example, the spring clamping portion 514 of the metal spring 510 includes two clamping sub-portions arranged side by side in up and down or left and right directions, and can be clamped one by one with two buckle branch slots 2242 arranged side by side in the up and down or left and right directions on the middle frame edge 222.

[0061] Further, the metal spring 510 can include the spring protruding portion 512 in the shape of C, V, U or O, and each of the spring clamping portions 514 provided on one side or both sides of the spring protruding portion 512. That is, the spring protruding portion 512 in the shape of C, V, U or O can be formed on the metal spring 510 by bending, so as to form the spring protruding portion 512 and apply elastic force to the middle frame structure 200 and the front frame structure 300 to adjust the gap therebetween when the metal spring 510 is arranged between the middle frame structure 200 and the front frame structure 300.

[0062] For example, the spring protruding portion 512 can be in the shape of C or V, and the spring clamping portion 514 can include each of the spring clamping hooks provided on both ends of the spring protruding portion 512 in the shape of C or V. When the metal spring 510 is arranged, each of the spring clamping hooks on both ends of the spring protruding portion 512 in the shape of C or V of the metal spring 510 can be clamped in the two buckle branch slots 2242 of the clamping slot 224 of the middle frame edge 222. Moreover, the metal spring 510 can be made of copper, stainless steel or other metal materials with certain elasticity.

[0063] Moreover, each of the metal springs 510 can include at least one branch spring. When the metal spring 510 includes one branch spring, the branch spring has the spring protruding portion 512 and the spring clamping portion 514 described above. When the metal spring 510 includes multiple branch springs, each of the branch springs has the spring protruding portion 512 and the spring clamping portion 514 described above, and the multiple branch springs are connected together by the spring clamping portion 514, and the spring protruding portions 512 of the adjacent branch springs are arranged at intervals to enhance the elastic force.

[0064] In addition, asFigures 3 to 8 As shown, the middle frame structure 200 can further include a plurality of positioning plates 240 respectively protruding outside the edges of the two sides of the middle frame plate 210, and the positioning plates 240 can be bent and extended to the outside of the middle frame main frame 220 and the front frame main frame 310, which not only can protect the front frame structure from the side, but also can facilitate the installation of the entire display device on other structures (such as the car wall of the rail transit vehicle). In addition, the middle frame structure 200 can further include a plurality of middle frame supports 250 respectively protruding outside the rear side of the middle frame plate 210, and the rear cover plate 400 and the display circuit board 110 can be located between the plurality of middle frame supports 250, which not only can carry the display device through the middle frame supports 250, but also can protect the rear cover plate 400 and the display circuit board 110 through the middle frame supports 250.

[0065] Compared with the traditional technology which simply relies on the self-structure of the middle frame structure 200 and the front frame structure 300, the display device provided by the utility model adds the metal spring 510, which significantly enhances the connectivity of the overall structure. In the installation process of the traditional middle frame structure 200 and the front frame structure 300, there will inevitably be a gap. The metal spring 510 is like a built-in "spring" and can provide a timely counterforce to the middle frame structure 200 and the front frame structure 300 during installation, reduce the gap and increase the contact area. The traditional technology has difficulty in ensuring the gap of the middle frame structure 200 and the front frame structure 300, but the metal spring 510 can provide accurate gap control according to design requirements. It does not excessively rely on the processing accuracy, and even if there is a slight size deviation in the processing process of the middle frame structure 200 and the front frame structure 300, the elasticity of the metal spring 510 can also adjust and ensure that the gap between the two meets the requirements. In terms of electrical performance, the gap of the traditional middle frame structure 200 and the front frame structure 300 is too large, which leads to poor performance in EFT test and ESD test, but the special design of the metal spring 510 can effectively improve this situation. For example, in the EFT test, the pulse signal under the traditional structure may be reflected multiple times in the gap between the middle frame structure 200 and the front frame structure 300, causing signal attenuation and interference, but the metal spring 510 can guide the signal to propagate correctly and reduce reflection. In the ESD test, the metal spring 510 can fill the weak link of electrostatic protection caused by the too large gap, and enhance the overall anti-static ability of the device.

[0066] The display device provided by the utility model can control the gap between the middle frame structure 200 and the front frame structure 300 accurately, avoids too large gap caused by deformation. The metal spring 510 can play the role of buffering and positioning between the middle frame structure 200 and the front frame structure 300, can offset part of deformation stress generated in the bending process of the middle frame structure 200 and the front frame structure 300, ensures that the two always maintain appropriate matching accuracy. The display device provided by the utility model can improve the performance of the equipment in EFT test and ESD test. By stabilizing the structural relationship of the middle frame structure 200 and the front frame structure 300, reducing the unreasonable accumulation of interference and static charge in the signal transmission process, so as to ensure that the equipment can work normally when suffering from electrical pulse and static discharge. The display device provided by the utility model can improve the display effect of the LCD display screen, fundamentally eliminate the influence of signal transmission abnormality and insufficient mechanical stability caused by structural problems on display quality, and ensure that the LCD display screen can stably and accurately display image content.

[0067] It should be noted that in the utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0068] The above is only the specific implementation of the utility model, so that those skilled in the art can understand or implement the utility model. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown in the text, but will conform to the widest scope consistent with the principles and novel features of the utility model shown in the text.

Claims

1. A display device (10) for a rail vehicle, characterized in that The application relates to a LCD display screen (100) comprising a display circuit board (110) and an LCD display assembly (120) connected with the display circuit board (110); a middle frame structure (200) comprising a middle frame plate (210) and a middle frame main frame (220) surrounding the periphery of the middle frame plate (210), the middle frame plate (210) and the middle frame main frame (220) surrounding the middle frame plate (210) to form a middle frame limiting cavity (230) with an open front side, the LCD display assembly (120) being limitedly arranged in the middle frame limiting cavity (230), and the display circuit board (110) being arranged on the rear side of the middle frame plate (210); a front frame structure (300) comprising a front frame main frame (310) detachably arranged on the periphery outside the middle frame main frame (220) and a front frame plate (320) arranged on the front side of the front frame main frame (310), the front frame plate (320) being limitedly arranged on the four peripheral edges of the front side of the LCD display assembly (120); a rear cover plate (400) detachably arranged on the outside of the middle frame plate (210) and covering the display circuit board (110); and a spring piece structure (500) comprising a plurality of metal spring pieces (510) arranged between the outer periphery of the middle frame main frame (220) and the inner periphery of the front frame main frame (310). One side of the metal spring piece (510) is detachably connected with the outer periphery of the middle frame main frame (220), and the other side is abutted against the inner periphery of the front frame main frame (310); or one side of the metal spring piece (510) is abutted against the outer periphery of the middle frame main frame (220), and the other side is detachably connected with the inner periphery of the front frame main frame (310); or one side of the metal spring piece (510) is detachably connected with the outer periphery of the middle frame main frame (220), and the other side is detachably connected with the inner periphery of the front frame main frame (310). One side of the metal spring piece (510) is buckle-connected with the outer periphery of the middle frame main frame (220), and the other side is abutted against the inner periphery of the front frame main frame (310). The middle frame main frame (220) comprises a plurality of middle frame edges (222) surrounding the periphery of the middle frame plate (210), and at least one metal spring piece (510) is buckle-connected on each middle frame edge (222). At least one clamping groove (224) is arranged on each middle frame edge (222), and at least one metal spring piece (510) is correspondingly clamped in each clamping groove (224). The clamping groove (224) is arranged along the transverse direction or the longitudinal direction of the middle frame edge (222), and the metal spring piece (510) is correspondingly clamped in the clamping groove (224) along the transverse direction or the longitudinal direction. Each clamping groove (224) comprises a plurality of buckle branch grooves (2242) arranged on the middle frame edge (222), and a plurality of parts of the metal spring piece (510) are correspondingly clamped in the buckle branch grooves (2242).

2. The display device (10) for use on a rail vehicle according to claim 1, characterized in that, ​ ​ ​ 3. The display device (10) for use on a rail vehicle according to claim 1, characterized in that, ​ 4. The display device (10) for use on a rail vehicle according to claim 3, characterized in that ​ 5. The display device (10) for use on a rail vehicle according to claim 4, characterized in that, ​ 6. The display device (10) for use on a rail vehicle according to claim 5, characterized in that ​ 7. The display device (10) for use on a rail vehicle according to claim 5, characterized in that, ​ 8. The display device (10) for use on a rail vehicle according to claim 1, characterized in that The metal spring (510) comprises a spring protruding portion (512) and a spring clamping portion (514) arranged on one side of the spring protruding portion (512), the spring clamping portion (514) is clamped on the outer circumferential side of the main frame (220), and the spring protruding portion (512) abuts the inner circumferential side of the front frame main frame (310); or, The metal spring (510) comprises a spring protruding portion (512) and a spring clamping portion (514) arranged on one side of the spring protruding portion (512), the spring clamping portion (514) is clamped on the outer circumferential side of the main frame (220), and the spring protruding portion (512) abuts the inner circumferential side of the front frame main frame (310); or, The metal spring (510) comprises a spring protruding portion (512) and a spring clamping portion (514) arranged on one side of the spring protruding portion (512), the spring clamping portion (514) is clamped on the outer circumferential side of the main frame (220), and the spring protruding portion (512) abuts the inner circumferential side of the front frame main frame (310); or, 9. The display device (10) for use on a rail vehicle according to claim 8, characterized in that The metal spring (510) comprises a spring protruding portion (512) and a spring clamping portion (514) arranged on one side of the spring protruding portion (512), the spring clamping portion (514) is clamped on the outer circumferential side of the main frame (220), and the spring protruding portion (512) abuts the inner circumferential side of the front frame main frame (310); or, 10. The display device (10) for use on a rail vehicle according to claim 9, characterized in that The spring protruding portion (512) is arranged in a C-shaped protrusion or a V-shaped protrusion, and the spring clamping portion (514) comprises a spring clamping hook arranged at each end of the C-shaped protrusion or the V-shaped protrusion. The spring protruding portion (512) is arranged in a C-shaped protrusion or a V-shaped protrusion, and the spring clamping portion (514) comprises a spring clamping hook arranged at each end of the C-shaped protrusion or the V-shaped protrusion.

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