Display device middle frame forming method, display device manufacturing method and printing device

Abstract

The invention relates to the technical field of 3D printing, in particular to a middle frame forming method of a display device and a display device manufacturing method. The method for forming the middle frame of the display device comprises the following steps of: scanning data; height scanning is conducted on the edge of the printing base body, and then the longitudinal sectional areas of different positions of the edge of the printing base body are obtained; dividing a printing area; according to a height scanning result, the edge area is divided into a plurality of printing areas, and continuous parts with the same longitudinal sectional area are divided into the same printing area; the printing area at least comprises a hollow area and a non-hollow area; printing a middle frame; printing of a middle frame material is conducted in the edge area along the periphery of the edge of the printing base body, according to the longitudinal sectional areas of the different printing areas, the same glue output amount is adopted in the different printing areas, meanwhile, printing is conducted at different printing speeds, and a middle frame with the top face consistent with the surface fluctuation change state of the printing base body is formed. By means of the method, the problem that in the prior art, the middle frame 3D printing step of a narrow-frame display device is tedious can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a method for forming a middle frame of a display device, a method for manufacturing the display device, and a printing device. Background Art

[0002] For the middle frame of the narrow-frame display device, one of the mainstream methods is to form the middle frame by 3D printing. The specific solution is to use high-precision 3D printing equipment to print one or more circles of glue along the edge of the product to form the middle frame. Usually, in order to achieve mass production efficiency of the product, a printing device is used to print along the edge of the product at the same speed. However, since the edge of the product is usually provided with auxiliary structures according to the function, the longitudinal cross-sectional shapes at different positions of the edge are not consistent. Therefore, when the same printing speed (i.e., the moving speed of the print head) is used for printing, the liquid level at the position with a large longitudinal cross-sectional area and the position with a small longitudinal cross-sectional area will be inconsistent, and the surface flatness is poor. It takes a period of leveling or secondary glue filling to make the glue liquid surface flatness meet the requirements. Another way is to control the amount of glue output at different positions by air pressure to make the flatness meet the requirements. However, there is a response delay in air pressure control. After the gas is pressurized, it cannot immediately affect the current glue output, but only affects the glue output later and thereafter. It cannot be quickly and directly reflected in the glue output, and it is difficult to accurately control. If pre-pressurization is applied in advance, it is also difficult to preset the advance amount and accurately control it because the pressure required for different situations is different. Therefore, the leveling or glue filling steps are still required. Therefore, in general, the current 3D printing of the middle frame of the narrow-frame display device has the problem of complicated steps. Summary of the invention

[0003] Therefore, in order to solve the problem of complicated steps in 3D printing of a middle frame of a narrow-frame display device in the prior art, the present invention provides a method for forming a middle frame of a display device and a method for forming a display device.

[0004] The present invention provides a method for forming a middle frame of a display device, comprising: providing a printing substrate, the printing substrate comprising a back plate, a display module layer, and a cover plate which are stacked; the edge of the display module layer is indented inwardly compared with the edge of the back plate, and the edge of the cover plate is indented inwardly compared with the display module layer; the printing substrate comprises an edge area, the edge area is an area including the edge of the back plate, the edge of the display module layer and the edge of the cover plate, and a certain width from the edge to the center of the printing substrate; wherein the portion of the back plate edge exposed by the display module layer is partially hollowed out; and further comprising the following steps: data scanning ; Perform a height scan on the edge of the printing substrate to obtain the longitudinal cross-sectional areas at different positions of the edge of the printing substrate; divide the printing area; divide the edge area into multiple printing areas according to the height scan result, and divide the continuous parts with the same longitudinal cross-sectional area into the same printing area; the printing area at least includes a hollow area and a non-hollow area; print the middle frame; print the middle frame material in the edge area along the edge of the printing substrate, and according to the longitudinal cross-sectional areas of different printing areas, use the same glue output in different printing areas, and use different printing speeds to print, so as to form a middle frame whose top surface is consistent with the surface undulation change state of the printing substrate.

[0005] Optionally, in the data scanning step, the printing substrate is scanned in a direction from an edge of the edge area away from the center of the printing substrate to an edge of the edge area close to the center of the printing substrate; at least the hollowed-out areas, the corner areas of the printing substrate, and the areas without hollowed-out areas between the corner areas of the printing substrate are scanned once.

[0006] Optionally, the printing speed of different printing areas and the longitudinal cross-sectional area of ​​the printing areas are calculated by the following relationship; v=Q / S; wherein v is the printing speed, S is the longitudinal cross-sectional area, and Q is a calculation constant, and its value is affected by the inner diameter of the needle, the tube resistance and the feed pressure of the printing device; the larger the inner diameter of the needle, the larger the Q; the larger the tube resistance, the smaller the Q; and the larger the feed pressure, the larger the Q.

[0007] Optionally, in the step of dividing the printing area, the non-hollow area includes a straight area and a corner area; the corner area is an area corresponding to the corner position in the edge area of ​​the printing substrate; the straight area is an area of ​​the non-hollow area between the corner areas on the same side; discontinuous areas at different positions are divided into different straight areas and different corner areas; discontinuous hollow areas at different positions are divided into different hollow areas.

[0008] Optionally, in the step of printing the middle frame, an anti-overflow wall is first formed in the edge area, and then printing materials are printed in the area within the anti-overflow wall in the edge area; after printing is completed, the anti-overflow wall is removed.

[0009] Optionally, in the step of forming the anti-overflow wall, the same glue output is used in the edge area, and different printing speeds are used for circumferential printing at least twice to form a laminated anti-overflow wall; wherein, the hollow area is avoided from being glued out.

[0010] Optionally, in the step of forming the anti-overflow wall, a first anti-overflow wall is formed at an edge of the edge area away from the center of the printing substrate; the middle frame is printed in the edge area, on the side wall of the first anti-overflow wall close to the center of the printing substrate toward the center of the printing substrate.

[0011] Optionally, in the step of forming the anti-overflow wall, a second anti-overflow wall is also formed at the edge of the edge area close to the center position of the printing substrate, and the top surface height of the second anti-overflow wall is greater than or equal to the top surface height of the first anti-overflow wall; the middle frame is printed and formed in the edge area, between the first anti-overflow wall and the second anti-overflow wall.

[0012] Optionally, in the step of printing the middle frame, the printing method includes direct writing printing, piezoelectric valve printing, needle valve printing, and inkjet printing.

[0013] The present invention further provides a method for manufacturing a display device, wherein a middle frame of the display device is formed by the method for forming a middle frame of the display device provided by the present invention.

[0014] The present invention also provides a printing device, which is suitable for 3D printing a printing substrate to form a middle frame; the printing substrate includes a back plate, a display module layer, and a cover plate which are stacked; the edge of the display module layer is indented inwardly compared with the edge of the back plate, and the edge of the cover plate is indented inwardly compared with the display module layer; the printing substrate includes an edge area, and the edge area includes the edge of the back plate, the edge of the display module layer and the edge of the cover plate, and an area of ​​a certain width from the edge to the center of the printing substrate; wherein the portion of the back plate edge exposed by the display module layer is partially hollowed out; the printing device includes: a carrier, suitable for carrying the printing substrate; a filling glue printing unit, suitable for printing the middle frame material in the edge area to form a middle frame with a flat top surface; a scanning unit, suitable for scanning the shape of the printing substrate to obtain the shape of the printing substrate Height data at different positions in the edge area; a bracket, suitable for installing the filling glue printing unit and the scanning unit; a driving unit, suitable for driving the bracket to move, so as to drive the scanning unit and the filling glue printing unit to move; the driving unit is a variable speed driving device; a numerical control unit, suitable for controlling the driving unit to drive the bracket to drive the scanning unit and the filling glue printing unit to move; and suitable for receiving the height data obtained by the scanning unit, performing calculation processing to obtain the longitudinal cross-sectional area of ​​the printing substrate at different positions in the edge area, and dividing the edge area into multiple printing areas according to the longitudinal cross-sectional area; and controlling the driving unit to drive the bracket to drive the filling glue printing unit to use the same glue output in different printing areas, and use different printing speeds for printing at the same time, so as to form a middle frame whose top surface is consistent with the surface undulation change state of the printing substrate.

[0015] Optionally, the printing device also includes: at least one anti-overflow wall printing unit, installed on the bracket, suitable for printing in the edge area to form an anti-overflow wall; a guide rail connected to the bracket, and the bracket is suitable for moving along the guide rail when driven by the driving unit.

[0016] The beneficial effects of the technical solution of the present invention are:

[0017] The method for forming the middle frame of the display device provided by the present invention obtains the longitudinal cross-sectional area at different positions of the edge area by scanning the height of the edge area, divides the edge area into different printing areas according to the longitudinal cross-sectional area, and prints different printing areas using the same glue output but different printing speeds according to the longitudinal cross-sectional area. The top surface of the middle frame formed after printing by the method provided by the present invention is formed in one step, and the top surface flatness consistency in the edge area is high, and no secondary glue filling or leveling steps are required, and the steps are simple; at the same time, the top surface flatness of the middle frame formed is also relatively high, and the product quality is higher; in addition, the same glue output is used to control the difference in printing speed. Compared with controlling the glue output by air pressure, there is no delay problem of glue output due to air pressure, and the change of speed is controlled by the printer, and it only needs to change according to the division of the area, which can respond in real time without delay, and has high accuracy and controllability.

[0018] The manufacturing method of the display device provided by the present invention adopts the middle frame forming method provided by the present invention to form the middle frame, obtains the longitudinal cross-sectional area at different positions of the edge area by scanning the edge area height, divides the edge area into different printing areas by the longitudinal cross-sectional area, and prints different printing areas using the same glue output but different printing speeds according to the longitudinal cross-sectional area. The top surface of the middle frame formed after printing by the method provided by the present invention is formed in one step, and the top surface flatness consistency in the edge area is high, and no secondary glue filling or leveling steps are required, and the steps are simple; at the same time, the top surface flatness of the middle frame formed is also relatively high, and the product quality is higher; in addition, the same glue output is used to control the difference in printing speed. Compared with controlling the glue output by air pressure, there is no delay problem of glue output caused by air pressure, and the speed change is controlled by the printer, and only needs to be changed according to the division of the area, which can respond in real time without delay, and has high accuracy and controllability.

[0019] The printing device provided by the present invention is suitable for 3D printing a printing substrate to form a middle frame using the middle frame forming method provided by the present invention. The longitudinal cross-sectional area at different positions of the edge area is obtained by scanning the height of the edge area, and the edge area is divided into different printing areas according to the longitudinal cross-sectional area. For different printing areas, the same glue output amount but different printing speeds are used for printing according to the longitudinal cross-sectional area. The top surface of the middle frame formed after printing by the method provided by the present invention is formed in one step, and the top surface flatness consistency in the edge area is high, and no secondary glue filling or leveling steps are required, and the steps are simple; at the same time, the top surface flatness of the middle frame formed is also relatively high, and the product quality is higher; in addition, the same glue output amount is used to control the difference in printing speed. Compared with controlling the glue output amount by air pressure, there is no delay problem of glue output due to air pressure, and the change of speed is controlled by the printer, which only needs to be changed according to the division of the area, and can respond in real time without delay, and the accuracy and controllability are high. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of a printing process of a middle frame of a display device in the prior art;

[0022] Figure 2 A schematic diagram of dividing the printing area in a method for forming a middle frame of a display device according to an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of a longitudinal section scan after a middle frame is formed by a middle frame printing method of a display device in the prior art;

[0024] Figure 4 A schematic longitudinal cross-sectional scan diagram of a method for forming a middle frame of a display device according to an embodiment of the present invention after forming the middle frame;

[0025] Figure 5 A graph showing the relationship between the amount of glue discharged and the printing speed in a method for forming a middle frame of a display device according to an embodiment of the present invention;

[0026] Figure 6 A longitudinal section slice photograph of a display device after forming a middle frame by a middle frame printing method in the prior art;

[0027] Figure 7 A longitudinal cross-sectional slice photograph of a method for forming a middle frame of a display device according to an embodiment of the present invention after forming the middle frame;

[0028] Figure 8a-8d Schematic diagram of longitudinal sections of different situations during the process of forming a middle frame in a method for forming a middle frame of a display device according to an embodiment of the present invention;

[0029] Fig. 9 A flowchart of a method for forming a middle frame of a display device according to an embodiment of the present invention;

[0030] Fig.10 The figure is a schematic diagram of the state of a part of the structure of a printing device in a printing process according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] refer to Figure 1 A method for printing a middle frame of a display device in the prior art provides a printing substrate, including a back plate, a display module layer, and a cover plate (due to the top view, Figure 1Only the cover plate 300 is shown in the figure); the edge of the display module layer is indented inwardly compared with the edge of the back plate, and the edge of the cover plate is indented inwardly compared with the display module layer; the printing substrate includes an edge area, and the edge area includes the edge of the back plate, the edge of the display module layer and the edge of the cover plate, and an area of ​​a certain width from the edge to the center of the printing substrate; wherein, the portion of the back plate edge exposed by the display module layer is partially hollowed out (the blank area without number in the figure); starting from a point in the edge area (for example Figure 1 Point a in the middle), print the middle frame material around the edge area (such as Figure 1 As shown by the arrow in the figure, of course, in different methods, it can also be as follows Figure 1 In the reverse direction, the starting point can also be other positions) to form the middle frame 400. The same glue output and printing speed are used in the process. The middle frame 400 formed in this way must have different heights in the middle frame 400 in the hollow position area and the middle frame 400 in other positions. Therefore, leveling or secondary glue filling is required to form a flat top surface. Therefore, the steps are complicated and the process flow is long. Alternatively, by pre-scanning, the height data at different positions are obtained, and the glue output is adjusted by air pressure. In this way, as described in the background technology, there are problems that are difficult to control, and the quality of the final product is still not ideal, and leveling or secondary glue filling is still required. In general, the middle frame formation method of the prior art has the problem of cumbersome steps.

[0032] In view of this, the present invention provides a method for forming a middle frame of a display device and a method for manufacturing a display device to solve the problem that the middle frame printing method in the prior art has complicated steps, a long process flow or is difficult to control.

[0033] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Example 1

[0038] refer to Figure 2 ,as well as Figure 8a , Figure 8b , Fig. 9 This embodiment provides a method for forming a middle frame of a display device, comprising:

[0039] A printing substrate is provided, wherein the printing substrate comprises a back plate 100, a display module layer 200, and a cover plate 300 which are stacked; an edge of the display module layer 200 is indented inwardly compared to an edge of the back plate 100, and an edge of the cover plate 300 is indented inwardly compared to the edge of the display module layer 200;

[0040] The printing substrate includes an edge region, and the edge region is a region including an edge of the back plate 100 , an edge of the display module layer 200 , and an edge of the cover plate 300 ;

[0041] The portion of the edge of the back plate 100 exposed by the display module layer is partially hollowed out (blank area without number in the figure);

[0042] The following steps are also included:

[0043] Data scanning: performing a height scan on the edge area of ​​the printing substrate to obtain the longitudinal cross-sectional area at different positions of the edge of the printing substrate;

[0044] Dividing the printing area; dividing the edge area into a plurality of printing areas according to the height scanning result, and dividing the continuous parts with the same longitudinal cross-sectional area into the same printing area; the printing area at least includes a hollow area and a non-hollow area;

[0045] Printing the middle frame; printing the middle frame material in the edge area along the edge of the printing substrate, using the same glue output in different printing areas according to the longitudinal cross-sectional areas, and printing at different printing speeds to form a middle frame whose top surface is consistent with the surface undulation change state of the printing substrate.

[0046] The method for forming the middle frame of the display device provided in this embodiment obtains the longitudinal cross-sectional area at different positions of the edge area by scanning the height of the edge area, divides the edge area into different printing areas according to the longitudinal cross-sectional area, and uses the same glue output but different printing speeds for printing according to the longitudinal cross-sectional area for different printing areas. The top surface of the middle frame formed after printing by the method provided by the present invention is formed in one step, and the top surface flatness consistency in the edge area is high, and no secondary glue filling or leveling steps are required, and the steps are simple; at the same time, the top surface flatness of the middle frame formed is also relatively high, and the product quality is higher; in addition, the same glue output is used to control the difference in printing speed. Compared with controlling the glue output by air pressure, there is no delay problem of glue output due to air pressure, and the speed change is controlled by the printer, which only needs to be changed according to the division of the area, and can respond in real time without delay, and the accuracy and controllability are high.

[0047] refer to Figure 3 and Figure 4 The middle frame formed by the middle frame forming method provided in this embodiment has a liquid surface on the top surface of the middle frame formed after one-step printing, which is obviously smoother than the liquid surface on the top surface of the middle frame formed after one-step printing by the printing method of the prior art, and the bulge of the prior art is obvious. Figure 6 and Figure 7 This is also confirmed by the longitudinal cross-sectional slice photos. The longitudinal cross-section of the middle frame of the final product is also that the top surface flatness of the middle frame formed by the method of this embodiment is higher than that of the top surface flatness of the middle frame formed by the printing method of the prior art.

[0048] Further, in this embodiment, in the step of data scanning, the printing substrate is scanned in a direction from an edge of the edge region away from the center of the printing substrate to an edge of the edge region close to the center of the printing substrate; in some embodiments, Figure 2 As shown, at least the hollowed-out area, the corner areas of the printing substrate, and the non-hollowed-out areas between the corner areas of the printing substrate are scanned once.

[0049] Furthermore, in this embodiment, in the step of dividing the printing area, the non-hollow area includes a straight area and a corner area; the corner area is an area corresponding to the corner position in the edge area of ​​the printing substrate; the straight area is an area of ​​the non-hollow area between the corner areas on the same side; areas that are not continuous at different positions are divided into different straight areas and different corner areas; and hollow areas that are not continuous at different positions are divided into different hollow areas. Figure 8a , Figure 8b As shown, the longitudinal section of the non-hollow area is roughly as follows Figure 8aAs shown, it includes a back plate 100, a display module layer 200 and a cover plate 300 arranged in layers. The middle frame 430 formed by printing the middle frame material covers the exposed surfaces of each layer in the edge area. The longitudinal section of the hollow area is roughly as follows Figure 8b As shown, the back plate 100 in the hollow area is removed, so it is completely covered by the display module layer 200 without being exposed. The middle frame 430 only covers the surface of the display module layer 200 and the cover plate 300 in the printed area.

[0050] like Figure 2 As shown, each of the areas 4001-4012 in the figure is scanned once. In actual operation, the division of the printing area and the scanning height can be performed at the same time. Since the hollow areas and corner areas are visible to the naked eye, the division of the areas can be basically determined by the naked eye. Since the sizes of the hollow positions are not the same, the different hollow areas 4006 and 4010 are divided into different hollow areas, and different printing speeds are used. Similarly, different corner areas and straight areas may also have size differences, so they are also divided into different printing areas, and different printing speeds are used. And non-connected straight areas (such as Figure 2 4007 and 4005) are also divided into different printing areas. This allows the speed change to be more accurately controlled, which is conducive to the one-time molding of the middle frame with high consistency of top surface flatness.

[0051] Furthermore, in this embodiment, the printing speed of different printing areas and the longitudinal cross-sectional area of ​​the printing area are calculated by the following relationship: v = Q / S; wherein v is the printing speed (i.e., the moving speed of the print head), S is the longitudinal cross-sectional area, and Q is a calculation constant, the value of which is affected by the inner diameter of the needle of the printing device, the tube resistance, and the feed air pressure; the larger the inner diameter of the needle, the larger Q; the larger the tube resistance, the smaller Q; the larger the feed air pressure, the larger Q. The relationship diagram is shown in FIG. Figure 5 In a preferred embodiment, the above relationship is v=19.86 / S.

[0052] For further reference, Figure 8c-Figure 8d In different embodiments, in the step of printing the middle frame, an anti-overflow wall is first formed in the edge area, and then the printing material is printed in the area within the anti-overflow wall in the edge area; after printing is completed, the anti-overflow wall is removed.

[0053] Specifically, in the step of forming the anti-overflow wall, the same glue output amount is used in the edge area, and different printing speeds are used for circumferential printing at least twice to form the stacked anti-overflow wall. Through multiple rounds of printing, a stack is formed, which is gradually piled up to form the anti-overflow wall. In particular, the hollow area is avoided from glue output.

[0054] For example, refer to Figure 8cIn one embodiment, in the step of forming the overflow prevention wall, a first overflow prevention wall 410 is formed at an edge of the edge area away from the center of the printing substrate; the middle frame 430 is printed in the edge area, on the side wall of the first overflow prevention wall 410 close to the center of the printing substrate toward the center of the printing substrate. Figure 2 The hollow area next to 4006 and 4010 is used to prevent glue from leaking out.

[0055] For example, refer to Figure 8d In the step of forming the anti-overflow wall, a second anti-overflow wall 420 is further formed at an edge of the edge region near the center of the printing substrate; the top surface height of the second anti-overflow wall 420 is greater than or equal to the top surface height of the first anti-overflow wall. The middle frame 430 is printed and formed in the edge region, between the first anti-overflow wall 410 and the second anti-overflow wall 420.

[0056] Furthermore, in the step of printing the middle frame, the printing method includes direct writing printing, piezoelectric valve printing, needle valve printing, and inkjet printing.

[0057] Example 2

[0058] This embodiment provides a method for manufacturing a display device, wherein a middle frame of the display device is formed by the method for forming a middle frame of a display device provided in the first embodiment.

[0059] The manufacturing method of the display device provided in this embodiment adopts the middle frame forming method provided in the above-mentioned embodiment 1 to form the middle frame, obtains the longitudinal cross-sectional area at different positions of the edge area by scanning the height of the edge area, divides the edge area into different printing areas by the longitudinal cross-sectional area, and prints different printing areas using the same glue output but different printing speeds according to the longitudinal cross-sectional area. The top surface of the middle frame formed after printing by the method provided by the present invention is formed in one step, and the top surface flatness consistency in the edge area is high, and no secondary glue filling or leveling steps are required, and the steps are simple; at the same time, the top surface flatness of the middle frame formed is also relatively high, and the product quality is higher; in addition, the same glue output is used to control the difference in printing speed. Compared with controlling the glue output by air pressure, there is no delay problem of glue output due to air pressure, and the speed change is controlled by the printer, which only needs to be changed according to the division of the area, and can respond in real time without delay, and the accuracy and controllability are high.

[0060] Example 3

[0061] refer to Fig.10, this embodiment provides a printing device, which is suitable for 3D printing a printing substrate to form a middle frame; the printing substrate includes a back plate, a display module layer, and a cover plate which are stacked; the edge of the display module layer is indented inwardly compared with the edge of the back plate, and the edge of the cover plate is indented inwardly compared with the display module layer; the printing substrate includes an edge area, and the edge area includes the edge of the back plate, the edge of the display module layer and the edge of the cover plate, and the area of ​​a certain width from the edge to the center of the printing substrate; wherein the portion of the back plate edge exposed by the display module layer is partially hollowed out;

[0062] Characterized in that the printing device comprises:

[0063] A carrier B, suitable for carrying the printing substrate A;

[0064] The filling glue printing unit 30 is adapted to print the middle frame material in the edge area to form a middle frame with a flat top surface;

[0065] A scanning unit 50, adapted to scan the shape of the printing substrate A to obtain height data at different positions in the edge region of the printing substrate;

[0066] A bracket, suitable for installing the filling glue printing unit and the scanning unit;

[0067] A driving unit (not shown in the figure) is suitable for driving the bracket to move, so as to drive the scanning unit 50 and the filling glue printing unit 30 to move; the driving unit is a variable speed driving device, for example, a variable speed motor;

[0068] The numerical control unit 40 is suitable for controlling the driving unit to drive the bracket to drive the scanning unit 50 and the filling glue printing unit 30 to move; and is suitable for receiving the height data obtained by the scanning unit 50, performing calculation processing to obtain the longitudinal cross-sectional area of ​​the printing substrate A at different positions in the edge area, and dividing the edge area into multiple printing areas according to the longitudinal cross-sectional area; and controlling the driving unit to drive the bracket to drive the filling glue printing unit to use the same glue output amount in different printing areas, and use different printing speeds for printing, so as to form a middle frame whose top surface is consistent with the surface undulation change state of the printing substrate.

[0069] The printing device provided in this embodiment is suitable for 3D printing a printing substrate to form a middle frame using the middle frame forming method provided in the above-mentioned embodiment 1. The longitudinal cross-sectional area at different positions of the edge area is obtained by scanning the height of the edge area, and the edge area is divided into different printing areas according to the longitudinal cross-sectional area. For different printing areas, the same glue output amount but different printing speeds are used for printing according to the longitudinal cross-sectional area. The top surface of the middle frame formed after printing by the method provided by the present invention is formed in one step, and the top surface flatness consistency in the edge area is high, and no secondary glue filling or leveling steps are required, and the steps are simple; at the same time, the top surface flatness of the middle frame formed is also relatively high, and the product quality is higher; in addition, the same glue output amount is used to control the difference in printing speed. Compared with controlling the glue output amount by air pressure, there is no delay problem of glue output due to air pressure. The change in speed is controlled by the printer, and it only needs to change according to the division of the area. It can respond in real time without delay, and the accuracy and controllability are high.

[0070] Furthermore, the printing device also includes:

[0071] At least one anti-overflow wall printing unit 20, mounted on the bracket, suitable for printing in the edge area to form an anti-overflow wall;

[0072] The guide rail 10 is connected to the bracket, and the bracket is suitable for moving along the guide rail under the drive of the driving unit.

[0073] refer to Fig.10 In some embodiments, the bracket includes a first bracket 11 connected to the guide rail 10 and a second bracket 12 for installing the filling glue printing unit 30, the anti-overflow wall printing unit 20, the scanning unit 50 and the numerical control unit 40. The first bracket 101 and the second bracket 12 are fixedly connected. The first bracket 11 is arranged vertically, and the second bracket 12 is arranged horizontally. The driving unit (not shown in the figure) is arranged on the first bracket 11 or the second bracket 12. The guide rail 10 includes a first guide rail and a second guide rail (not shown in the figure) that are horizontally orthogonal, so that the bracket can move along an orthogonal first direction and a second direction, so that the moving trajectory can cover all positions of the printing substrate.

[0074] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for forming a middle frame of a display device, characterized in that: include: A printing substrate is provided, wherein the printing substrate comprises a back plate, a display module layer, and a cover plate which are stacked; an edge of the display module layer is indented inwardly compared to an edge of the back plate, and an edge of the cover plate is indented inwardly compared to the display module layer; The printing substrate includes an edge area, and the edge area includes the edge of the back plate, the edge of the display module layer and the edge of the cover plate, and an area of ​​a certain width from the edge to the center of the printing substrate; Wherein, the portion of the edge of the back plate exposed by the display module layer is partially hollowed out; The following steps are also included: Data scanning: performing a height scan on the edge area of ​​the printing substrate to obtain the longitudinal cross-sectional area at different positions of the edge of the printing substrate; Dividing the printing area; dividing the edge area into a plurality of printing areas according to the height scanning result, and dividing the continuous parts with the same longitudinal cross-sectional area into the same printing area; the printing area at least includes a hollow area and a non-hollow area; Printing the middle frame; printing the middle frame material in the edge area along the edge of the printing substrate, using the same glue output in different printing areas according to the longitudinal cross-sectional areas, and printing at different printing speeds to form a middle frame whose top surface is consistent with the surface undulation change state of the printing substrate.

2. The method for forming a middle frame of a display device according to claim 1, wherein: In the data scanning step, the printing substrate is scanned in a direction from an edge of the edge region away from the center of the printing substrate to an edge of the edge region close to the center of the printing substrate; At least the hollowed-out area, the corner areas of the printing substrate, and the non-hollowed-out areas between the corner areas of the printing substrate are scanned once.

3. The method for forming a middle frame of a display device according to claim 1, wherein: The printing speed of different printing areas and the longitudinal cross-sectional area of ​​the printing area are calculated by the following relationship: v=Q / S Among them, v is the printing speed, S is the longitudinal cross-sectional area, and Q is a calculation constant, whose value is affected by the inner diameter of the needle, the tube resistance and the feed pressure of the printing device; the larger the inner diameter of the needle, the larger Q; the larger the tube resistance, the smaller Q; and the larger the feed pressure, the larger Q.

4. The method for forming a middle frame of a display device according to claim 1, wherein: In the step of dividing the printing area, the non-hollow area includes a straight area and a corner area; the corner area is an area corresponding to a corner position in an edge area of ​​the printing substrate; the straight area is an area of ​​the non-hollow area between the corner areas on the same side; discontinuous areas at different positions are divided into different straight areas and different corner areas; Discontinuous hollow areas at different positions are divided into different hollow areas.

5. The method for forming a middle frame of a display device according to claim 1, wherein: In the step of printing the middle frame, an anti-overflow wall is first formed in the edge area, and then printing of printing materials is performed in the area within the anti-overflow wall in the edge area; After printing is completed, the anti-overflow wall is removed.

6. The method for forming a middle frame of a display device according to claim 5, characterized in that: In the step of forming the anti-overflow wall, the same glue output is used in the edge area, and different printing speeds are used for circumferential printing at least twice to form a laminated anti-overflow wall; wherein, the hollow area is avoided from being glued.

7. The method for forming a middle frame of a display device according to claim 5, characterized in that: In the step of forming the anti-overflow wall, a first anti-overflow wall is formed at an edge of the edge area away from the center of the printing substrate; the middle frame is printed in the edge area, on the side wall of the first anti-overflow wall close to the center of the printing substrate toward the center of the printing substrate.

8. The method for forming a middle frame of a display device according to claim 7, wherein: In the step of forming the anti-overflow wall, a second anti-overflow wall is further formed at an edge of the edge area close to the center of the printing substrate, and the top surface height of the second anti-overflow wall is greater than or equal to the top surface height of the first anti-overflow wall; The middle frame is printed and formed within the edge area, between the first anti-overflow wall and the second anti-overflow wall.

9. The method for forming a middle frame of a display device according to claim 1, wherein: In the step of printing the middle frame, the printing method includes direct writing printing, piezoelectric valve printing, needle valve printing, and inkjet printing.

10. A method for manufacturing a display device, characterized in that: The middle frame of the display device is formed by the method for forming the middle frame of the display device according to any one of claims 1 to 9.

11. A printing device, suitable for performing 3D printing on a printing substrate to form a middle frame; the printing substrate comprises a back plate, a display module layer, and a cover plate which are stacked; the edge of the display module layer is indented inwardly compared with the edge of the back plate, and the edge of the cover plate is indented inwardly compared with the display module layer; The printing substrate includes an edge area, which includes the edge of the back plate, the edge of the display module layer and the edge of the cover plate, and an area of ​​a certain width from the edge to the center of the printing substrate; wherein, The portion of the edge of the back plate exposed by the display module layer is partially hollowed out; Characterized in that the printing device comprises: A carrier, suitable for carrying the printing substrate; A filling glue printing unit, adapted to print the middle frame material in the edge area to form a middle frame with a flat top surface; A scanning unit, adapted to scan the shape of the printing substrate to obtain height data at different positions in the edge region of the printing substrate; A bracket, suitable for installing the filling glue printing unit and the scanning unit; A driving unit, adapted to drive the bracket to move, so as to drive the scanning unit and the filling glue printing unit to move; the driving unit is a variable speed driving device; The numerical control unit is suitable for controlling the driving unit to drive the bracket to drive the scanning unit and the filling glue printing unit to move; and is suitable for receiving the height data obtained by the scanning unit, performing calculation processing to obtain the longitudinal cross-sectional area of ​​the printing substrate at different positions in the edge area, and dividing the edge area into multiple printing areas according to the longitudinal cross-sectional area; and controlling the driving unit to drive the bracket to drive the filling glue printing unit to use the same glue output amount in different printing areas, and use different printing speeds to print at the same time, so as to form a middle frame whose top surface is consistent with the surface undulation change state of the printing substrate.

12. The printing device according to claim 11, characterized in that: Also includes: At least one anti-overflow wall printing unit, mounted on the bracket, suitable for printing in the edge area to form an anti-overflow wall; A guide rail is connected to the bracket, and the bracket is suitable for moving along the guide rail under the drive of the driving unit.

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