Preparation method of spliced ​​display screen and spliced ​​display screen

Abstract

The present application discloses a method for preparing a spliced ​​display screen and a spliced ​​display screen. The method comprises: providing a display module; laser welding the display module along a predetermined trajectory to form a weld for sealingly connecting a first substrate and a second substrate; wherein the weld comprises a peripheral closed section and at least one internal partitioning section, the peripheral closed section and each internal partitioning section forming at least two closed loops to respectively enclose each functional element. The above scheme simultaneously achieves the connection and sealing of the first and second substrates and the splicing between the display units through laser welding, eliminating the need for sealant in the traditional sealing process. The weld formed by laser welding is narrower than the width of traditional sealant, thereby achieving a narrow frame and "seamless" splicing. The splicing is also completed simultaneously with the laser welding, reducing the number of splicing steps.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a method for preparing a spliced ​​display screen and the spliced ​​display screen. Background Art

[0002] To compete with the LED (Light Emitting Diode) large-screen direct display industry, the LCD (Liquid Crystal Display) TV industry has been continuously innovating and developing numerous narrow-bezel products. These products, combined to achieve large-screen displays, compete with current direct-display micro LED displays. However, increasingly narrow bezels require significant design changes to the existing panel structure. This sacrifices the width of the frame adhesive, resulting in reduced adhesion between the upper and lower glass substrates and a weakened panel structure, greatly increasing the risk of glass panel breakage. Furthermore, traditional splicing methods utilize modules. The presence of the front bezel not only increases the distance between the AA (Active Area) and the AA (currently the narrowest on the market is 0.88mm), but also increases the use of backlight modules, significantly impacting both the visual quality and cost of the splicing process. Summary of the Invention

[0003] The present application provides a method for preparing a spliced ​​display screen and a spliced ​​display screen, so as to reduce the width of the splicing seam and improve the splicing appearance.

[0004] To solve the above technical problems, the first technical solution provided by this application is:

[0005] A method for preparing a spliced ​​display screen, comprising:

[0006] A display module is provided; the display module includes a first substrate and a second substrate arranged opposite to each other, and at least two functional elements located between the first substrate and the second substrate;

[0007] The display module is laser welded along a preset trajectory to form a weld for sealingly connecting the first substrate and the second substrate; wherein the weld includes an outer closed section and at least one inner partition section, and the outer closed section and each inner partition section form at least two closed loop portions to respectively enclose each functional element therein.

[0008] According to one embodiment of the present application, at least one of the internal partition segments is a partition sub-weld.

[0009] According to one embodiment of the present application, the closed loop portions are arranged in a matrix, and the closed loop portions are all rectangular.

[0010] According to an embodiment of the present application, the laser welding of the display module along a preset trajectory to form a weld for sealingly connecting the first substrate and the second substrate includes:

[0011] Adding welding auxiliary materials on the surface of the display module along the track;

[0012] The laser is focused on the welding auxiliary material for welding.

[0013] According to one embodiment of the present application, the welding auxiliary material includes one or more of polyamide, epoxy resin and unsaturated polyester resin.

[0014] According to one embodiment of the present application, a clearance area is provided on the outside of the functional element for isolating the effect of welding heat.

[0015] According to an embodiment of the present application, the width of the weld is 50 to 100 um, and the width of the clearance area is 100 to 200 um.

[0016] According to an embodiment of the present application, the functional element includes an effective display area, and the spacing between the effective display areas of adjacent functional elements is 200 um.

[0017] According to an embodiment of the present application, after the step of laser welding the display module along a preset trajectory to form a weld for sealingly connecting the first substrate and the second substrate, the method further includes:

[0018] Splitting along the perimeter line to obtain a spliced ​​panel having a plurality of the functional elements; wherein the weld is located inside the perimeter line;

[0019] The spliced ​​display screen is obtained by installing the spliced ​​panel in the module outer frame.

[0020] In order to solve the above technical problems, the second technical solution provided by this application is:

[0021] A spliced ​​display screen is manufactured using the above method.

[0022] The beneficial effects of this application are:

[0023] The preparation method of the spliced ​​display screen and the spliced ​​display screen provided in the present application simultaneously achieve the connection sealing of the first substrate and the second substrate and the splicing between the display units through laser welding, eliminating the frame glue in the traditional sealing process. The weld width formed by laser welding is smaller than the width of traditional frame glue, so a narrow frame can be achieved, realizing "seamless" splicing, and the splicing is completed at the same time as the laser welding, which also reduces the splicing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0025] Figure 1 is a flow chart of an exemplary embodiment of a method for preparing a spliced ​​display screen of the present application;

[0026] Figure 2 is a structural diagram of a first embodiment of a display module of the present application;

[0027] Figure 3 yes Figure 2 A partial enlarged view of

[0028] Figure 4 is a structural diagram of a second embodiment of the display module of the present application;

[0029] Figure 5 yes Figure 2 Schematic diagram of the structure of the weld formed after laser welding;

[0030] Figure 6 yes Figure 4 Schematic diagram of the structure of the weld formed after laser welding;

[0031] Figure 7 1 is a schematic structural diagram of a first embodiment of a weld of the present application;

[0032] Figure 8 is a structural schematic diagram of a second embodiment of a weld of the present application;

[0033] Figure 9 is a structural schematic diagram of a third embodiment of a weld of the present application;

[0034] Figure 10 yes Figure 1 A flow chart of an exemplary embodiment of step S2 in the method for preparing a spliced ​​display screen is shown;

[0035] Figure 11 is a flow chart of another exemplary embodiment of a method for preparing a spliced ​​display screen of the present application;

[0036] Figure 12 It is a structural diagram of an exemplary embodiment of the spliced ​​display screen of the present application.

[0037] Description of reference numerals:

[0038] First substrate 100a

[0039] Color layer 110a

[0040] Black matrix layer 120a

[0041] First transparent conductive layer 130a

[0042] The first alignment layer 140a

[0043] Second substrate 200a

[0044] Second transparent conductive layer 210a

[0045] The second alignment layer 220a

[0046] Functional element 300a

[0047] LCD 310a

[0048] First substrate 100b

[0049] Second substrate 200b

[0050] Functional element 300b

[0051] Weld 400

[0052] Peripheral closed section 410

[0053] Internal partition 420

[0054] CELL10

[0055] Module frame 20 DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0057] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] This application provides a method for preparing a spliced ​​display screen. Figure 1 , Figure 11 is a flow chart of an exemplary embodiment of a method for preparing a spliced ​​display screen of the present application. Specifically, the method may include the following steps:

[0059] S1: Provide a display module; wherein the display module includes a first substrate and a second substrate arranged opposite to each other, and at least two functional elements located between the first substrate and the second substrate.

[0060] Specifically, see Figure 2 and Figure 3 , Figure 2 is a structural diagram of the first embodiment of the display module of the present application, Figure 3 yes Figure 2 , the display module in this embodiment includes a first substrate 100a, a second substrate 200a and a functional element 300a.

[0061] Specifically, the first substrate 100a and the second substrate 200a are both large glass panels, and the multiple functional elements 300a between the first substrate 100a and the second substrate 200a are used to implement the display function of the display module. For example, when the display module is a liquid crystal display (LCD), the components of the LCD are the upper and lower substrates, and the liquid crystal (LC) located between the upper and lower substrates. The upper and lower substrates are respectively a TFT (thin film transistor) substrate and a CF (color film) substrate.

[0062] The CF substrate includes a first substrate 100a, and a plurality of color layers (Color Layer, referred to as CF) 110a, a black matrix (Black Matrix, referred to as BM) layer 120a, a first transparent conductive layer (ITO layer) 130a and a first alignment layer 140a provided on the first substrate 100a. The TFT substrate includes a second substrate 200a, and a TFT layer ( Figure 3 The first and second alignment layers 140a and 220a are filled with liquid crystal (LC) 310a.

[0063] There are multiple functional elements 300a between the first substrate 100a and the second substrate 200a. Each functional element 300a includes the above-mentioned color layer 110a, black matrix layer 120a, first transparent conductive layer 130a, first alignment layer 140a, liquid crystal 310a, second alignment layer 220a and second transparent conductive layer 210a. The display function of the LCD is realized by the functional element 300a. It should be noted that only the main structure of the functional element 300a is listed here. The functional element 300a is a well-known structure in the LCD field and will not be described in detail in this application.

[0064] The typical process for existing LCD spliced ​​displays is to seal the liquid crystal with glue, then cut the large glass plate to form multiple independent display units (CELLs) with liquid crystals, then assemble the individual cells into modules, and then splice the modules together to form a spliced ​​display. This application uses a subsequent laser welding process to directly seal the liquid crystal to form multiple spliced ​​cells, achieving both the sealing of a single cell and the splicing of multiple cells. The spliced ​​cells are then assembled into modules to form a spliced ​​display. Laser welding and module assembly will be explained in detail later.

[0065] This application is mainly used for LCD splicing display. In addition, it can also be used for OLED (Organic Electroluminescence Display, organic light emitting diode) splicing display. Figure 4 , Figure 4 3 is a schematic structural diagram of a second embodiment of a display module of the present application. The display module in this embodiment includes a first substrate 100b, a second substrate 200b and a functional element 300b.

[0066] Specifically, the first substrate 100b includes a TFT substrate, the second substrate 200b includes a cover glass, and the functional element 300b includes an organic self-luminous layer.

[0067] S2: Laser welding the display module along a preset trajectory to form a weld for sealingly connecting the first substrate and the second substrate; wherein the weld includes an outer closed section and at least one inner partition section, and the outer closed section and each inner partition section form at least two closed loop portions to respectively enclose each functional element therein.

[0068] See also Figure 5 , Figure 5 yes Figure 2The structural diagram of the weld formed after laser welding shows that after laser welding, a weld 400 is formed between the first substrate 100a and the second substrate 200a to surround the functional element 300a, thereby achieving a sealed connection between the first substrate 100a and the second substrate 200a.

[0069] See also Figure 6 , Figure 6 yes Figure 4 The structural diagram of the weld formed after laser welding shows that after laser welding, a weld 400 is formed between the first substrate 100b and the second substrate 200b to surround the functional element 300b, thereby achieving a sealed connection between the first substrate 100b and the second substrate 200b.

[0070] This application mainly focuses on the following Figure 2 and Figure 5 The LCD splicing display process is described in detail.

[0071] The present application uses laser welding to achieve the connection and sealing between the first substrate 100a and the second substrate 200a. Laser welding uses high-energy laser pulses to locally heat a small area of ​​the material. The energy of the laser radiation diffuses into the material through heat conduction, melting the material to form a specific molten pool, thereby achieving the purpose of welding. Therefore, when two pieces of glass need to be sealed and connected, the laser beam can be focused on the two pieces of glass to be welded. The energy generated by the laser beam causes the two pieces of glass to form a weld at the welding interface to achieve connection. After the welding is completed along the preset trajectory, the CELL is sealed.

[0072] The equipment used for laser welding is a laser welding machine, which has a laser welding head. During welding, the laser welding head performs contactless processing from the outer surface of the display module (specifically, the outer surface of the first substrate 100a or the second substrate 200a). Since the distance between the first substrate 100a and the second substrate 200a is very small (the cell thickness of the cell is about 3 to 5um), when the laser beam acts on the outer surface of the display module, a weld 400 can be formed at the welding interface, achieving a sealed connection between the first substrate 100a and the second substrate 200a. After the laser welding is completed, multiple cells 10 are formed. Figure 5 The structure shown in the dotted box is CELL10. A single CELL10 includes a functional element 300a and a first substrate 100a and a second substrate 200a corresponding to two sides of the functional element 300a.

[0073] During the welding process, since the laser welding energy is very large and there is a heat-affected zone, and there are multiple components and circuits between the first substrate 100a and the second substrate 200a during welding, in order to avoid damaging the surrounding components and circuits during laser welding, a clearance area is set outside the functional element 300a to protect the surrounding components and circuits from being affected, that is, to isolate the impact of welding heat. The width of the clearance area is 100 to 200um.

[0074] From the above principle of laser welding to form weld seam 400, it can be understood that, since laser welding is generally performed automatically, the above-mentioned preset trajectory can be the movement trajectory of the laser welding head preset by the internal program of the laser welding machine. The laser welding head moves along the preset trajectory to perform laser welding, thereby forming the above-mentioned weld seam 400. Of course, in other embodiments, when manual welding is used, the preset trajectory can also be a mark temporarily set on the surface of the first substrate 100a or the second substrate 200a. Manual laser welding can also be performed along the mark to form the desired weld seam 400.

[0075] Traditional cell sealing uses sealant, which is typically 500µm wide. A minimum of 350µm is required to ensure safety. This results in a wider cell border. A narrower border requires sacrificing the width of the sealant. This reduces the adhesion between the upper and lower substrates, weakening the panel and significantly increasing the risk of glass panel breakage. This application uses laser welding to achieve a sealant connection between the upper and lower substrates, achieving a weld width of only 50-100µm. Compared to sealant, the cell border is significantly narrower.

[0076] See again Figure 2 and Figure 3 Functional element 300a has an active display area (AA), which is the total area for displaying text and graphics. This area is the area where text and graphics are displayed by the color layers 110a of adjacent cells 10. After laser welding is completed to form a large spliced ​​cell, the width of the seam between individual cells 10 is actually the spacing D between the active display areas, that is, the spacing between the color layers 110a of adjacent cells 10. This application uses laser welding to achieve sealing and splicing of cells 10, ultimately reducing the spacing between active display areas to a minimum of 200 μm, far lower than the currently narrowest size of 880 μm, achieving a truly "seamless" splicing.

[0077] See also Figures 7 to 9 , Figures 7 to 9 Schematic diagrams of the structures of three embodiments of the weld of the present application. The preset trajectory and the shape of the weld 400 are determined according to the number of cells 10 used for splicing and the shape arrangement of the cells 10. Figure 7 This is a structural diagram of the first embodiment of the weld of the present application, which shows the weld structure of two cells. Figure 8 : is a structural diagram of the second embodiment of the weld of the present application, which shows the weld structure of four cells. Figure 9 3 is a structural diagram of the third embodiment of the weld of the present application, which shows a weld structure with two cells and four cells.

[0078] Depend on Figure 7 and Figure 8 It can be seen that the weld 400 includes an outer closed section 410 and at least one internal partition section 420. Each adjacent CELL10 is separated by an internal partition section 420. The outer closed section 410 and each internal partition section 420 form at least two closed loop portions to enclose each functional element 300a respectively.

[0079] Figure 7 The weld structure of two cells has one internal partition 420 in the weld 400. Figure 8 The weld seam structure of a four-cell assembly includes four internal partitions 420. Since individual cells 10 are typically rectangular in shape and arranged in a matrix, correspondingly, each closed loop portion is arranged in a matrix, and each closed loop portion is rectangular. Based on the weld seam structures of the two- and four-cell assembly described above, it can be inferred that when there are four or more cells 10, i.e., when each cell 10 is arranged in a matrix of N rows and M columns, the weld seam 400 structure of the assembled cell is as follows: the number of internal partitions 420 is (N-1)*(M-1)*N*M, and the peripheral closed segments 410 surround each internal partition 420, where M and N are both integers greater than or equal to 3.

[0080] Figure 7 and Figure 8 All of them are made into a spliced ​​CELL on the same large glass plate, except Figure 7 and Figure 8 In addition to the structure, you can also Figure 9 As shown, two or more spliced ​​cells are made simultaneously on the same large glass plate.

[0081] Based on the above embodiment, at least one internal partition segment 420 is a partition sub-weld. Preferably, each internal partition segment 420 between two adjacent cells 10 is a partition sub-weld. In this embodiment, adjacent cells 10 have only one partition sub-weld, meaning that adjacent cells 10 share a single weld. This further reduces the spacing between adjacent cells 10, further reducing the spacing D between the active display areas of the spliced ​​cells 10 to as little as 200 μm, achieving seamless splicing. In other embodiments, to enhance the bonding strength between the first substrate 100a and the second substrate 200a, the number of partition sub-welds in the internal partition segment 420 can be appropriately increased, meaning that two or more partition sub-welds are provided between adjacent cells 10.

[0082] It can be seen that the present application realizes the connection sealing of the first substrate 100a and the second substrate 200a and the splicing between CELL10 at the same time through laser welding, eliminating the frame glue in the traditional sealing process. The width of the weld 400 formed by laser welding is smaller than the width of the traditional frame glue, so it can achieve a narrow frame and realize "seamless" splicing. The splicing is completed at the same time as laser welding, and the subsequent splicing process is also reduced.

[0083] Based on the above examples, please refer to Figure 10 , Figure 10 yes Figure 1 The flowchart of an exemplary embodiment of step S2 in the method for preparing a spliced ​​display screen is shown. Step S2 of the embodiment of the present application may include:

[0084] S21: adding welding auxiliary materials on the surface of the display module along the track.

[0085] S22: The laser is focused on the welding auxiliary material for welding.

[0086] In the embodiments of this application, a welding material is added to the welding interface. The laser is then focused onto the material, causing it to melt and then solidify, further enhancing the adhesion between the two pieces of glass. Specifically, the welding material includes one or more of polyamide, epoxy resin, and unsaturated polyester resin. Unsaturated polyester resin is the most commonly used filler material, blending seamlessly with the glass material to form a strong weld that resists erosion by external moisture.

[0087] Based on the above examples, please refer to Figure 11 , the embodiment of the present application further includes, after step S2:

[0088] S3: Splitting along the perimeter line to obtain a spliced ​​panel with multiple functional elements; wherein the weld is located inside the perimeter line.

[0089] S4: Install the splicing panels in the module frame to obtain a spliced ​​display screen.

[0090] The purpose of splitting along the perimeter line is to remove excess waste and obtain a large spliced ​​CELL. The perimeter line refers to a boundary line at a certain distance from the outer periphery of the weld 400. The perimeter line surrounds the weld 400, and the distance between the perimeter line and the weld 400 should be as small as possible to ensure that the weld 400 is not damaged after splitting and that there is no excessive waste around the weld 400.

[0091] See also Figure 12 , Figure 12 A structural diagram of a splicing display screen formed by installing a splicing panel in a module frame 20 is shown. In the present application, the splicing panel is installed in the module frame 20 to complete the assembly of the module. Compared with the traditional method of assembling a single CELL in a module and then splicing multiple modules, the present application reduces the use of the module frame 20 and reduces the cost on the one hand, and can further reduce the width of the splicing seam on the other hand, that is, further reduce the distance D between the effective display areas to achieve "seamless" splicing.

[0092] The present application also provides a spliced ​​display screen, which is prepared by the method of the above embodiment. The spliced ​​display screen includes a module frame and a spliced ​​display unit arranged in the module frame. The spliced ​​display unit is prepared by steps S1 to S3 of the above embodiment. The structure of the spliced ​​display screen is as follows: Figure 12 Since the spliced ​​display screen adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here.

[0093] The terms "first", "second" and "third" in this application are only used for descriptive purposes and should not be understood as indicating the number of the indicated technical features. Thus, the features defined as "first", "second" and "third" can explicitly or implicitly include at least one of these features. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back ...) are only used to explain the relative positional relationship, movement, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0094] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for preparing a spliced ​​display screen, characterized in that: include: A display module is provided; wherein the display module includes a first substrate and a second substrate arranged opposite to each other, and at least two functional elements located between the first substrate and the second substrate; Laser welding is performed on the first substrate and the second substrate along a predetermined trajectory to form a weld for sealingly connecting the first substrate and the second substrate; wherein the weld includes a peripheral closed section and at least one internal separation section, the peripheral closed section and each internal separation section forming at least two closed loop portions to respectively enclose each functional element, and the closed loop portions are arranged in a matrix; the weld width is 50 to 100 μm; Splitting along the perimeter line to obtain a spliced ​​panel having a plurality of the functional elements; wherein the weld is located inside the perimeter line; The spliced ​​display screen is obtained by installing the spliced ​​panel in the module outer frame.

2. The method for preparing a spliced ​​display screen according to claim 1, wherein: At least one of the internal partition segments is a partition sub-weld.

3. The method for preparing a spliced ​​display screen according to claim 1, wherein: The closed loop portions are arranged in a matrix, and all of the closed loop portions are rectangular.

4. The method for preparing a spliced ​​display screen according to claim 1, wherein: The laser welding of the display module along a preset track to form a weld for sealingly connecting the first substrate and the second substrate comprises: Adding welding auxiliary materials on the surface of the display module along the track; The laser is focused on the welding auxiliary material for welding.

5. The method for preparing a spliced ​​display screen according to claim 4, wherein: The welding auxiliary material includes one or more of polyamide, epoxy resin and unsaturated polyester resin.

6. The method for preparing a spliced ​​display screen according to claim 1, wherein: The functional element has a clearance area outside for isolating the functional element from the influence of welding heat.

7. The method for preparing a spliced ​​display screen according to claim 6, wherein: The width of the clearance area is 100 to 200 μm.

8. The method for preparing a spliced ​​display screen according to claim 1, wherein: The functional element includes an effective display area, and the distance between the effective display areas of adjacent functional elements is 200 μm.

9. A spliced ​​display screen, characterized in that: The spliced ​​display screen is manufactured by the method according to any one of claims 1 to 8.

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