Spliced ​​liquid crystal display device and assembly method thereof

Abstract

The present application relates to a spliced ​​liquid crystal display device and an assembly method thereof. The spliced ​​liquid crystal display device includes at least two liquid crystal display units spliced ​​together. The liquid crystal display unit includes a liquid crystal display panel, a backlight module located on the backlight side of the liquid crystal display panel, and a circuit board assembly. The liquid crystal display panel includes a display area and a frame area located around the display area. The frame area includes a binding area and a non-binding area. The width of the binding area is greater than that of the non-binding area. The backlight module includes a back plate, a middle frame, a light board, and an optical component. The circuit board assembly is electrically connected to the binding area and is arranged toward one side of the back plate. The liquid crystal display unit also includes a front frame. The front frame includes a positive pressure portion and a side pressure portion arranged in an intersecting manner. The positive pressure portion is pressed against one side of the binding area of ​​the liquid crystal display panel, and the side pressure portion is connected to the back plate and / or the middle frame. The non-binding area of ​​the liquid crystal display panel is connected to the middle frame via a colloid. The present application can effectively reduce the splicing seam and improve the display quality of the picture.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a spliced ​​liquid crystal display device and an assembly method thereof. Background Art

[0002] With the rapid development of the outdoor display market, large-size, high-resolution spliced ​​display screens have become the development direction of outdoor displays. Spliced ​​display screens generally use multiple LCD units for splicing, and use corner front frames and optical glue to press and fix the LCD panels of the LCD units to the backlight module to achieve large-screen display. Since the edges of the LCD panel and the surrounding glue frame are non-display areas, the front frame can effectively shield the non-display area and improve the aesthetics. However, the edge where the binding area of ​​the LCD panel is located is wider, while the other edges where the binding area is not set are narrower. The entire edge of the LCD panel is matched with the front frame, resulting in a larger splicing seam formed at the splicing of two adjacent LCD units, affecting the display quality. Summary of the Invention

[0003] The purpose of this application is to provide a spliced ​​liquid crystal display device and an assembly method thereof, which can effectively reduce the splicing seams and improve the picture display quality.

[0004] In the first aspect, an embodiment of the present application proposes a spliced ​​liquid crystal display device, comprising at least two liquid crystal display units spliced ​​together, the liquid crystal display unit comprising a liquid crystal display panel, a backlight module located on the backlight side of the liquid crystal display panel, and a circuit board assembly, the liquid crystal display panel comprising a display area and a frame area located around the display area, the frame area comprising a binding area and a non-binding area, the width of the binding area being greater than the width of the non-binding area; the backlight module comprising a back panel, a middle frame, a light board and an optical component, the circuit board assembly being electrically connected to the binding area and being arranged toward one side of the back panel; the liquid crystal display unit also comprising a front frame, the front frame comprising a positive pressure portion and a side pressure portion arranged to intersect, the positive pressure portion being crimped to one side of the binding area of ​​the liquid crystal display panel, the side pressure portion being connected to the back panel and / or the middle frame; the non-binding area side of the liquid crystal display panel is connected to the middle frame through a colloid.

[0005] In one possible embodiment, the colloid includes a first adhesive portion and a second adhesive portion that are intersectingly arranged, the first adhesive portion is located on the side of the non-binding area of ​​the liquid crystal display panel, and the second adhesive portion is located between the back of the non-binding area of ​​the liquid crystal display panel and the middle frame.

[0006] In a possible implementation, the first adhesive portion is a curing adhesive, and the second adhesive portion is a white translucent curing adhesive, or the second adhesive portion is a combination adhesive including α-adhesive and β-adhesive.

[0007] In a possible implementation, both the first adhesive part and the second adhesive part are white translucent cured adhesives, or both the first adhesive part and the second adhesive part are composite adhesives including α adhesive and β adhesive.

[0008] In a possible implementation, the thickness of the first adhesive part and the thickness of the second adhesive part are 0.05 mm - 0.7 mm; or the thicknesses of both the first adhesive part and the second adhesive part are 0.05 mm - 0.7 mm.

[0009] In a possible implementation, an ink barrier layer is further provided between the side surface of the non-bonding area of the liquid crystal display panel and the first adhesive part, and the thickness of the ink barrier layer is 0.01 mm - 0.1 mm.

[0010] In a possible implementation, buffer layers are respectively provided between the positive pressure part and the bonding area of the liquid crystal display panel and between the side pressure part and the backplane and / or the middle frame.

[0011] In a possible implementation, the optical component includes a reflective sheet, a diffusion plate, and an optical control film disposed on the light-emitting side of the lamp board, and support columns are further provided between the reflective sheet and the diffusion plate; the middle frame includes a first frame body corresponding to the bonding area and a second frame body corresponding to the non-bonding area, and step parts for supporting the diffusion plate are respectively provided on the first frame body and the second frame body, and the distance d between the side surface of the step part and the diffusion plate satisfies the following condition: 0 < d < 0.5 mm; along the light-emitting direction, the height of the second frame body is greater than the height of the first frame body, and the height difference between the two is less than or equal to the thickness of the optical control film.

[0012] In a possible implementation, a light-shielding layer is further provided on the side part of the colloid of the liquid crystal display panel and one side of the corresponding middle frame.

[0013] In a second aspect, an assembling method for a spliced liquid crystal display device is provided in an embodiment of the present application, including: providing a liquid crystal display panel, a backlight module, a front frame, and a circuit board assembly, and electrically connecting the circuit board assembly to the bonding area of the liquid crystal display panel; horizontally placing the backlight module, coating a colloid on one side of the middle frame corresponding to the non-bonding area of the liquid crystal display panel to make it semi-cured and thickened; vertically or obliquely placing the backlight module, attaching the liquid crystal display panel to the light-emitting side of the backlight module, and scraping and leveling the overflowing colloid and then curing it; horizontally placing the backlight module, assembling the front frame to one side of the bonding area of the liquid crystal display panel, and attaching a light-shielding layer to the side part of the colloid of the liquid crystal display panel and one side of the corresponding middle frame; assembling the circuit board assembly to one side of the backplane of the backlight module.

[0014] The spliced ​​liquid crystal display device provided in the embodiment of the present application includes at least two liquid crystal display units spliced ​​together, the liquid crystal display unit includes a liquid crystal display panel, a backlight module located on the backlight side of the liquid crystal display panel, and a circuit board assembly, the liquid crystal display panel includes a display area and a frame area located around the display area, the frame area includes a binding area and a non-binding area, the width of the binding area is greater than the width of the non-binding area; the backlight module includes a back plate, a middle frame, a light board and an optical component, the circuit board assembly is electrically connected to the binding area and is arranged toward one side of the back plate; the liquid crystal display unit also includes a front frame, the front frame includes a positive pressure portion and a side pressure portion arranged to intersect, the positive pressure portion is pressed against the liquid crystal display surface On one side of the binding area of ​​the board, the side pressure part is connected to the back panel or the middle frame; the non-binding area side of the liquid crystal display panel is connected to the middle frame through a colloid; thus, the present application combines the characteristics that the binding area of ​​the frame area is wider and the non-binding area is narrower, and the frame area of ​​the liquid crystal display panel in at least two liquid crystal display units spliced ​​together corresponds to the binding area by using a front frame to press the position to the side of the backlight module, and the frame area corresponds to the non-binding area by using a colloid to bond to the middle frame. Since the colloid occupies less space than the front frame structure, it can effectively reduce the width of the splicing seam formed by splicing the non-binding area and binding area of ​​the two adjacent liquid crystal display units, thereby improving the picture display quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the drawings, identical components are denoted by the same reference numerals. The drawings are not drawn to scale and are intended only to illustrate relative positions. Layer thicknesses in certain locations are exaggerated for ease of understanding, and the layer thicknesses depicted in the drawings do not necessarily represent actual layer thickness proportions.

[0016] Figure 1 A schematic structural diagram of a spliced ​​liquid crystal display device provided in the first embodiment of the present application is shown;

[0017] Figure 2 Show Figure 1 A schematic structural diagram of the liquid crystal display unit;

[0018] Figure 3 Show Figure 2 A cross-sectional view of the liquid crystal display unit along direction MM;

[0019] Figure 4 Show Figure 3 A partial enlarged view of the middle area A;

[0020] Figure 5 1. A cross-sectional view of a liquid crystal display unit along direction MM in a spliced ​​liquid crystal display device provided in a second embodiment of the present application is shown;

[0021] Figure 6 Show Figure 5A partial enlarged view of the middle area B;

[0022] Figure 7 A flowchart showing an assembly method of a spliced ​​liquid crystal display device according to a third embodiment of the present application is shown;

[0023] Figure 8 and Figure 9 A schematic diagram illustrating the assembly process of a spliced ​​liquid crystal display device provided in the second embodiment of the present application is shown.

[0024] Description of reference numerals:

[0025] 100. Liquid crystal display unit;

[0026] 1. Liquid crystal display panel; 11. Array substrate; 12. Color filter substrate; AA, display area; NA, border area; BA, binding area; SA, non-binding area; T, step portion;

[0027] 2. Backlight module; 21. Back panel; 22. Middle frame; 221. First frame; 222. Second frame; 23. Light board; 24. Optical assembly; 241. Diffuser; 242. Optical control diaphragm; 25. Reflector; 26. Support column;

[0028] 3. Circuit board assembly; 31. Flexible circuit board; 32. Rigid printed circuit board; 4. Front frame; 41. Positive pressure part; 42. Side pressure part;

[0029] 5. colloid; 51. first adhesive portion; 52. second adhesive portion;

[0030] 6. Ink barrier layer; 7. Buffer layer; 8. Light-shielding layer. DETAILED DESCRIPTION

[0031] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are set forth in order to provide a comprehensive understanding of the present application. However, it will be apparent to those skilled in the art that the present application can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the well-known structures and techniques are not shown in order to avoid unnecessary ambiguity in the present application; and, for clarity, the sizes of regional structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0032] First embodiment

[0033] like Figure 1 and Figure 2As shown, the first embodiment of the present application provides a spliced ​​liquid crystal display device, including at least two liquid crystal display units 100 spliced ​​together, the liquid crystal display unit 100 includes a liquid crystal display panel 1, a backlight module 2 located on the backlight side of the liquid crystal display panel 1 and a circuit board assembly 3, the liquid crystal display panel 1 includes a display area AA and a border area NA located on the peripheral side of the display area AA, the border area NA includes a binding area BA and a non-binding area SA, the width of the binding area BA is greater than the width of the non-binding area SA; the backlight module 2 includes a back panel 21, a middle frame 22, a light board 23 and an optical component 24, the circuit board assembly 3 is electrically connected to the binding area BA, and is arranged toward the side of the back panel 21.

[0034] The liquid crystal display unit 100 also includes a front frame 4, which includes a positive pressure portion 41 and a side pressure portion 42 arranged to intersect each other. The positive pressure portion 41 is pressed against one side of the binding area BA of the liquid crystal display panel 1, and the side pressure portion 42 is connected to the back panel 21 and / or the middle frame 22; the non-binding area SA side of the liquid crystal display panel 1 is connected to the middle frame 22 through the colloid 5.

[0035] like Figure 2 As shown, the liquid crystal display panel 1 mainly includes an array substrate 11 and a color filter substrate 12 arranged opposite each other, and a liquid crystal layer (not shown) arranged between the array substrate 11 and the color filter substrate 12. Generally, because the array substrate 11 needs to be provided with a binding area BA to electrically connect with the circuit board assembly 3, the overall size of the array substrate 11 is larger than the overall size of the color filter substrate 12, resulting in the width of the binding area BA in the border area NA being larger than the width of the non-binding area SA. The non-binding area SA can be used for applying sealant to encapsulate the array substrate 11, the color filter substrate 12, and the liquid crystal layer into a box.

[0036] In related art, the entire frame area NA of the LCD panel 1 is fixedly connected to the backlight module 2 via the front frame 4. This results in a large seam between two adjacent LCD units 100, affecting the display quality. To reduce the seam, related art also proposes omitting the front frame 4 and encapsulating the frame area NA with a light-shielding layer or directly bonding the frame area NA to the outer cover on the light-emitting side. This results in a loose connection between the LCD panel 1 and the backlight module 2, affecting the reliability of the spliced ​​LCD device.

[0037] For this reason, Figure 3As shown, in the first embodiment of the present application, combined with the characteristics that the binding area BA of the frame area NA is wider and the non-binding area SA is narrower, the binding area BA is pressed to the side of the backlight module 2 through the front frame 4, that is, the front frame 4 includes a positive pressure portion 41 and a side pressure portion 42 arranged to intersect, the positive pressure portion 41 is pressed to the side of the binding area BA of the liquid crystal display panel 1, and the width of the positive pressure portion 41 is smaller than the width of the binding area BA; the side pressure portion 42 is connected to the back panel 21 or the middle frame 22 to ensure the stability and reliability of the connection between the liquid crystal display panel 1 and the backlight module 2; and for the non-binding area SA, the non-binding area SA is connected to the middle frame 22 by bonding with a colloid 5. Since the colloid 5 occupies less space than the front frame 4 structure, the width of the splicing seam formed by splicing the non-binding areas SA and the binding areas BA of two adjacent liquid crystal display units 100 can be reduced.

[0038] The spliced ​​liquid crystal display device provided in the embodiment of the present application includes at least two liquid crystal display units 100 spliced ​​together, the liquid crystal display unit 100 includes a liquid crystal display panel 1, a backlight module 2 located on the backlight side of the liquid crystal display panel 1 and a circuit board assembly 3, the liquid crystal display panel 1 includes a display area AA and a frame area NA located on the peripheral side of the display area AA, the frame area NA includes a binding area BA and a non-binding area SA, the width of the binding area BA is greater than the width of the non-binding area SA; the backlight module 2 includes a back plate 21, a middle frame 22, a light board 23 and an optical component 24, the circuit board assembly 3 is electrically connected to the binding area BA and is arranged toward the side of the back plate 21; the liquid crystal display unit 100 also includes a front frame 4, the front frame 4 includes a positive pressure part 41 and a side pressure part 42 arranged to intersect, the positive pressure part 41 is pressed against the side of the binding area BA of the liquid crystal display panel 1, and the side pressure part 42 is connected to the back plate 21 or the middle frame 22; the non-binding area SA side of the liquid crystal display panel 1 is connected to the middle frame 22 through a colloid 5. Therefore, the present application combines the characteristics that the binding area BA of the border area NA is wider and the non-binding area SA is narrower, and the border area NA of the liquid crystal display panel 1 in at least two liquid crystal display units 100 that are spliced ​​together is pressed to the side of the backlight module 2 using a front frame 4 at a position corresponding to the binding area BA, and the border area BA is bonded to the middle frame 22 using a glue 5 at a position corresponding to the non-binding area SA. Since the glue 5 occupies less space than the front frame structure, the width of the splicing seam formed by splicing the non-binding area BA and the binding area SA of the two adjacent liquid crystal display units 100 can be effectively reduced, thereby improving the picture display quality.

[0039] In some examples, such as Figure 4 As shown, the colloid 5 includes a first adhesive portion 51 and a second adhesive portion 52 that are intersectingly arranged. The first adhesive portion 51 is located on the side of the non-binding area SA of the liquid crystal display panel 1, and the second adhesive portion 52 is located between the back of the non-binding area SA of the liquid crystal display panel 1 and the middle frame 22.

[0040] Optionally, the thickness of the first adhesive portion 51 is 0.05 to 0.3 mm. The first adhesive portion 51 is located on the side of the non-binding area SA of the liquid crystal display panel 1, also known as side glue, and is used to improve the structural strength of the side of the non-binding area SA and prevent the array substrate 11 and the color filter substrate 12 from separating due to water vapor intrusion on the side of the liquid crystal display panel 1.

[0041] Optionally, the thickness of the second adhesive portion 52 is 0.05 mm to 0.7 mm. The second adhesive portion 52 is located between the back of the non-binding area SA of the LCD panel 1 and the middle frame 22 and is also called back glue, and is used to securely connect the LCD panel 1 to the middle frame 22 .

[0042] Furthermore, in one example, the first adhesive portion 51 is a curing glue, and the second adhesive portion 52 is a white translucent curing glue. The first adhesive portion 51 can be cured by ultraviolet light or heat, and the second adhesive portion 52 is a white translucent curing glue that is cured by ultraviolet light or heat, and diffuses after light penetrates. Before the liquid crystal display panel 1 is assembled to the backlight module 2, the first adhesive portion 51 is first applied, and then the second adhesive portion 52 is applied to the back of the middle frame 22 or the non-binding area SA of the liquid crystal display panel 1, and then the two are cured and connected.

[0043] In another example, the second adhesive portion 52 is a combination of α-glue and β-glue. During assembly, α-glue is applied to the middle frame 22, and β-glue is applied to the back of the LCD panel 1. The α-glue and β-glue are two glues containing different reactive monomers mixed in a perfect ratio. When the two come into contact at room temperature, high temperature, or under UV irradiation, a chemical reaction occurs, causing them to solidify.

[0044] In some examples, a buffer layer 7 is provided between the positive pressure portion 41 of the front frame 4 and the binding area BA of the liquid crystal display panel 1 , and between the side pressure portion 42 and the back plate 21 or the middle frame 22 .

[0045] Optionally, the buffer layer 7 between the positive pressure portion 41 and the bonding area BA of the liquid crystal display panel 1 can be a polyurethane (PU) material. Optionally, the buffer layer 7 between the side pressure portion 42 and the back panel 21 or the middle frame 22 can be a patch, PU material, or soft paint. Further optionally, the side pressure portion 42 is connected to the side wall of the back panel 21 and / or the middle frame 22 by screws or adhesive.

[0046] In some examples, the optical assembly 24 includes a reflective sheet 25 located on the light-emitting side of the light board 23 , a diffuser 241 , and an optical control film 242 . A support column 26 is further provided between the reflective sheet 25 and the diffuser 241 .

[0047] The light board 23 includes a circuit board and a plurality of light-emitting elements disposed on the circuit board. The reflective sheet 25 is provided with a slotted opening corresponding to the light-emitting elements, and the slotted opening can prevent the reflective sheet 26 from blocking the light emitted by the light-emitting elements. Optionally, the reflective sheet 25 can be made of a plastic material. For example, polyethylene terephthalate (PET), polycarbonate (PC), polystyrene (PS), etc. The reflective sheet 25 can also include a high-reflection coating applied to the plastic material, such as titanium dioxide TiO2, to increase the light reflection coefficient. The reflective sheet 25 can reflect the light between the optical control diaphragm 242 and the backplane 21 back to the optical control diaphragm 242 again, improving the light output efficiency of the backlight module 2 and ultimately enhancing the backlight brightness of the backlight module 2.

[0048] The diffusion plate 241 and the optical control diaphragm 242 are fixedly connected by a transparent optical adhesive to prevent relative displacement between the diffusion plate 241 and the optical control diaphragm 242 from affecting the light output effect of the backlight module 2.

[0049] The diffusion plate 241 is used to diffuse the light emitted by the light board 23 to balance the brightness of the entire backlight module 2. The optical control diaphragm 242 can include, for example, a prism sheet, a protective sheet, etc. The prism sheet is used to control the propagation direction of the light diffused by the diffusion plate 241 so that the propagation direction of the light is perpendicular to the liquid crystal display panel 1. The protective sheet is used to protect the prisms of the prism sheet from scratches, etc. The protective sheet can also be used to widen the viewing angle that was narrowed due to the prism sheet before.

[0050] Furthermore, the support column 26 is an elastic column that can be telescoped along its own axis. One end of the support column 26 along its own axis is connected to the reflective sheet 25, and the other end abuts against the diffusion plate 241.

[0051] Optionally, the support column 26 is an elastic thimble with a spring disposed inside, and it can be telescoped with the change of the light mixing distance. The number of the support columns 26 is multiple, and the ends of the multiple support columns 26 away from the reflective sheet 25 respectively abut against the diffusion plate 241 to prevent the middle position of the optical control diaphragm 242 from sagging inward due to its own gravity and affecting the light output effect. This backlight module 2 with multiple support columns 26 is especially suitable for display devices with larger sizes, such as display devices with a size of 67 inches or larger.

[0052] Furthermore, the middle frame 22 includes a first frame body 221 corresponding to the bonding area BA and a second frame body 222 corresponding to the non-bonding area SA. The first frame body 221 and the second frame body 222 are respectively provided with a step portion T for supporting the diffusion plate 241, and the distance d between the side surface of the step portion T and the diffusion plate 241 satisfies the following condition: 0 < d < 0.5 mm; along the light output direction, the height of the second frame body 222 is greater than the height of the first frame body 221, and the height difference between the two is less than or equal to the thickness of the optical control diaphragm 242.

[0053] As Figure 3 shown, along the light-emitting direction, the height of the second housing 222 is greater than that of the first housing 221. There is a step difference between the top support surfaces of the first housing 221 and the second housing 222, and the height h of the step difference d satisfies h ≤ the total thickness of the optical control film 242.

[0054] As Figure 4 shown, the first housing 221 and the second housing 222 are respectively provided with a stepped portion T for supporting the diffusion plate 241. The distance d between the side surface of the stepped portion T and the diffusion plate 241 satisfies the following condition: 0 < d < 0.5 mm. Since the diffusion plate 241 is prone to thermal expansion due to the high temperature of the lamp board 23, setting the distance d like this can reserve space for the thermal deformation of the diffusion plate 241, prevent the diffusion plate 241 from deforming and affecting the light-emitting effect, and improve the optical quality.

[0055] In some examples, a light-shielding layer 8 is further provided on the side of the colloid 5 of the liquid crystal display panel 1 and on one side of the corresponding middle frame 22. The light-shielding layer 8 is used to prevent light leakage and improve the light-emitting effect and aesthetics of the display device.

[0056] Thus, in this embodiment, in the plurality of liquid crystal display units 100 spliced together, the splicing seam formed between the liquid crystal display panels 1 of two adjacent liquid crystal display units 100 includes two parts: one part is the width of the front frame 4 corresponding to the bonding area BA, and the other part is the width of the colloid 5 corresponding to the non-bonding area SA. The width of the colloid 5 is less than the width of the front frame 4, and the sum of their widths is greater than the sum of the widths of the two parts of the front frame 4, that is, the width of the splicing seam. This not only meets the stability requirement that the liquid crystal display panel 1 needs the front frame 4 for support, but also minimizes the width of the splicing seam as much as possible, improving the picture display quality.

[0057] Second Embodiment

[0058] As Figure 5 and Figure 6 shown, the second embodiment of the present application provides a spliced liquid crystal display device, which is similar in structure to the spliced liquid crystal display device in the foregoing first embodiment. The difference lies in that the colloid 5 structure and the assembly sequence on the non-bonding area SA side of the liquid crystal display panel 1 are different.

[0059] Specifically, in one example, the first adhesive portion 51 and the second adhesive portion 52 of the colloid 5 are both white, translucent curing adhesives that are cured by UV or heat, and diffuse when light passes through them. During assembly, the colloid 5 is first applied to the second frame body 222 of the middle frame 22 at a position corresponding to the non-binding area SA. After semi-curing and thickening, the colloid 5 is then attached to the LCD panel 1 at an angle or vertically, allowing the colloid 5 to overflow and cover the sides of the LCD panel 1. A suspended heating knife is then used to scrape the adhesive to smooth the edges, thereby forming the first adhesive portion 51 and the second adhesive portion 52, respectively. The cured thickness of the first and second adhesive portions is 0.05 mm to 0.7 mm.

[0060] In another example, the first adhesive portion 51 and the second adhesive portion 52 are both a combination of α glue and β glue. During assembly, α glue is applied to the position of the second frame 222 of the middle frame 22 corresponding to the non-binding area SA (a small amount of β glue can be added if the viscosity is insufficient), and β glue is applied to the back of the liquid crystal display panel 1 (a small amount of α glue can be added if the viscosity is insufficient). After each is semi-cured, the liquid crystal display panel 1 and the second frame 222 of the middle frame 22 are attached. Alpha glue and β glue are two types of glue containing different reactive monomers mixed in a perfect proportion. The overflow can be smoothed with a suspended scraper. When the two come into contact at room temperature or high temperature or under UV irradiation, a chemical reaction will occur and solidify. After curing, the first adhesive portion 51 and the second adhesive portion 52 are formed, and the thickness of the first adhesive portion 51 and the second adhesive portion 52 after curing is 0.05mm-0.7mm.

[0061] In some examples, an ink barrier layer 6 is further provided between the side surface of the non-binding area SA of the liquid crystal display panel 1 and the first adhesive portion 51 , and the thickness of the ink barrier layer 6 is 0.01 mm to 0.1 mm.

[0062] Because the first adhesive portion 51 is not applied to the LCD panel 1 before assembly, an ink barrier layer 6 can be applied to the side of the non-binding area SA to prevent separation of the array substrate 11 and the color filter substrate 12 due to moisture intrusion from the sides of the LCD panel 1. The ink barrier layer 6 can be cured by UV or heat and has a thickness of generally 0.01 mm to 0.1 mm. The first adhesive portion 51 formed after subsequent curing covers the ink barrier layer 6.

[0063] Third embodiment

[0064] like Figure 7 As shown, the third embodiment of the present application provides an assembly method of any of the spliced ​​liquid crystal display devices described above, including the following steps S1 to S5. Figure 8 and Figure 9 The specific steps of the assembly method are described in detail.

[0065] Step S1 : providing a liquid crystal display panel 1 , a backlight module 2 , a front frame 4 and a circuit board assembly 3 , wherein the circuit board assembly 3 is electrically connected to the binding area BA of the liquid crystal display panel 1 .

[0066] Step S2: placing the backlight module 2 horizontally, and coating the colloid 5 on the side of the middle frame 22 corresponding to the non-binding area SA of the liquid crystal display panel 1 to semi-solidify and thicken it.

[0067] like Figure 8 As shown, the colloid 5 is cured by ultraviolet equipment or heated by a heating device, so that the curing rate of the colloid 5 is 3-40% and the colloid 5 is thickened, and the viscosity is greater than 3500cp.

[0068] Taking the spliced ​​liquid crystal display device of the first embodiment as an example, before assembly, the first adhesive portion 51 is coated on one side of the non-binding area SA of the liquid crystal display panel, and is UV-cured or heat-cured. Then, the second adhesive portion 52 is coated on the back side of the non-binding area SA of the middle frame 22 or / the liquid crystal display panel, and is UV-cured or heat-cured.

[0069] Taking the spliced ​​liquid crystal display device of the second embodiment as an example, before assembly, an ink barrier layer 6 is coated on one side of the non-binding area SA of the liquid crystal display panel, and a colloid 5 is coated on the back of the middle frame 22 or / the non-binding area SA of the liquid crystal display panel, and then semi-cured and thickened.

[0070] Step S3: Place the backlight module 2 vertically or tilted, attach the liquid crystal display panel 1 to the light-emitting side of the backlight module 2, and smooth out the overflowed colloid 5 with a scraper and then solidify it.

[0071] like Figure 9 As shown, taking the spliced ​​liquid crystal display device of the second embodiment as an example, after the backlight module 2 is placed vertically or tilted, the side coated with the colloid 5 is on the top, and the liquid crystal display panel 1 is attached to the light-emitting side of the backlight module 2. The colloid 5 can be pressed thin and overflowed, and the overflowed colloid 5 is scraped flat and then solidified, thereby forming the second adhesive portion 52 and the first adhesive portion 51 respectively.

[0072] Step S4: Place the backlight module 2 horizontally, assemble the front frame 4 to the binding area BA side of the LCD panel 1, and apply the light shielding layer 8 to the side of the colloid 5 of the LCD panel 1 and the corresponding side of the middle frame 22;

[0073] Step S5 : assembling the circuit board assembly 3 to one side of the back plate 21 of the backlight module 2 .

[0074] The assembly method of the spliced ​​liquid crystal display device provided in the embodiment of the present application is based on the characteristics that the binding area BA of the border area NA is wider and the non-binding area SA is narrower. The border area NA of the liquid crystal display panel 1 in at least two liquid crystal display units 100 that are spliced ​​together is pressed to the side of the backlight module 2 by using a front frame 4 at a position corresponding to the binding area BA, and the border area BA is bonded to the middle frame 22 by using a glue 5 at a position corresponding to the non-binding area SA. Since the glue 5 occupies less space than the front frame structure, the width of the splicing seam formed by splicing the non-binding area BA and the binding area SA of the two adjacent liquid crystal display units 100 can be effectively reduced, thereby improving the picture display quality.

[0075] It should be noted that the technical solutions of the liquid crystal display panel 1 provided in each embodiment of the present application can be widely used in various liquid crystal display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, and MVA (Multi-Domain Vertical Alignment) display panel.

[0076] It should be readily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes the meaning of “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0077] As used herein, the term "substrate substrate" refers to the material on which subsequent material layers are added. The substrate substrate itself can be patterned. The material added on top of the substrate substrate can be patterned, or it can remain unpatterned. In addition, the substrate substrate can include a wide range of materials, such as silicon, germanium, gallium arsenide, indium phosphide, etc. Alternatively, the substrate substrate can be made of a non-conductive material (e.g., glass, plastic, or sapphire wafer, etc.).

[0078] As used herein, the term "layer" may refer to a portion of a material comprising an area having a certain thickness. A layer may extend over the entire underlying structure or overlying structure, or may have an extent smaller than the extent of the underlying or overlying structure. In addition, a layer may be an area of ​​a homogeneous or inhomogeneous continuous structure whose thickness is less than the thickness of the continuous structure. For example, a layer may be located between the top and bottom surfaces of the continuous structure or between any pairs of lateral planes at the top and bottom surfaces. A layer may extend laterally, vertically, and / or along a tapered surface. A substrate may be a layer, may include one or more layers therein, and / or may have one or more layers located thereon, above, and / or below it. A layer may include multiple layers. For example, an interconnect layer may include one or more conductors and a contact layer (within which contacts, interconnects, and / or vias are formed) and one or more dielectric layers.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A spliced ​​liquid crystal display device, comprising at least two liquid crystal display units spliced ​​together, wherein the liquid crystal display unit comprises a liquid crystal display panel, a backlight module located on the backlight side of the liquid crystal display panel, and a circuit board assembly; the liquid crystal display panel comprises a display area and a frame area located around the display area, the frame area comprises a binding area and a non-binding area, and the width of the binding area is greater than that of the non-binding area; the backlight module comprises a back plate, a middle frame, a light board, and an optical component; the circuit board assembly is electrically connected to the binding area and is arranged toward one side of the back plate; characterized in that: The liquid crystal display unit further includes a front frame, the front frame including a positive pressure portion and a side pressure portion arranged to intersect each other, the positive pressure portion is pressed against one side of the binding area of ​​the liquid crystal display panel, and the side pressure portion is connected to the back plate and / or the middle frame; the non-binding area of ​​the liquid crystal display panel is connected to the middle frame via a colloid; The optical assembly includes a reflector, a diffuser, and an optical control film located on the light-emitting side of the light board, and a support column is provided between the reflector and the diffuser; The middle frame includes a first frame body corresponding to the binding area and a second frame body corresponding to the non-binding area. The first frame body and the second frame body are respectively provided with a step portion supporting the diffuser plate. The distance d between the side surface of the step portion and the diffuser plate meets the following conditions: <d<0.5mm; Along the light emitting direction, the height of the second frame body is greater than the height of the first frame body, and the height difference between the two is less than or equal to the thickness of the optical control film.

2. The spliced ​​liquid crystal display device according to claim 1, wherein: The colloid includes a first adhesive portion and a second adhesive portion that are intersectingly arranged, the first adhesive portion is located on the side of the non-binding area of ​​the liquid crystal display panel, and the second adhesive portion is located between the back of the non-binding area of ​​the liquid crystal display panel and the middle frame.

3. The spliced ​​liquid crystal display device according to claim 2, wherein: The first adhesive portion is a curing adhesive, and the second adhesive portion is a white translucent curing adhesive, or the second adhesive portion is a combination adhesive including α-adhesive and β-adhesive.

4. The spliced ​​liquid crystal display device according to claim 2, wherein: The first adhesive portion and the second adhesive portion are both white translucent curing adhesive, or the first adhesive portion and the second adhesive portion are both composite adhesives including α-adhesive and β-adhesive.

5. The spliced ​​liquid crystal display device according to claim 4, characterized in that: An ink barrier layer is further provided between the side surface of the non-binding area of ​​the liquid crystal display panel and the first adhesive portion, and the thickness of the ink barrier layer is 0.01 mm to 0.1 mm.

6. The spliced ​​liquid crystal display device according to claim 2, wherein: The thickness of the first adhesive portion is 0.05 mm to 0.3 mm, and the thickness of the second adhesive portion is 0.05 mm to 0.7 mm; or the thickness of the first adhesive portion and the thickness of the second adhesive portion are both 0.05 mm to 0.7 mm.

7. The spliced ​​liquid crystal display device according to claim 1, wherein: Buffer layers are respectively provided between the positive pressure portion and the binding area of ​​the liquid crystal display panel and between the side pressure portion and the back plate and / or the middle frame.

8. The spliced ​​liquid crystal display device according to claim 1, wherein: A light shielding layer is further provided on the side of the colloid of the liquid crystal display panel and on a corresponding side of the middle frame.

9. A method for assembling a spliced ​​liquid crystal display device according to any one of claims 1 to 8, characterized in that: include: Providing a liquid crystal display panel, a backlight module, a front frame and a circuit board assembly, wherein the circuit board assembly is electrically connected to the binding area of ​​the liquid crystal display panel; The backlight module is placed horizontally, and a colloid is applied to the non-binding area of ​​the middle frame corresponding to the liquid crystal display panel to semi-solidify and thicken the colloid; Place the backlight module vertically or tilted, attach the liquid crystal display panel to the light-emitting side of the backlight module, and smooth out the overflowed colloid by scraping and solidifying it; Place the backlight module horizontally, assemble the front frame to one side of the binding area of ​​the liquid crystal display panel, and apply a light shielding layer to the side of the colloid of the liquid crystal display panel and the corresponding side of the middle frame; The circuit board assembly is assembled to one side of the back plate of the backlight module.

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