Printing device and forming method of circuit protection layer of display device

Abstract

The invention relates to the technical field of 3D printing, in particular to a printing device and a forming method of a circuit protection layer of a display device. The printing apparatus of the present invention comprises: a main body support; the body support is provided with a front end and a rear end in the horizontal direction. The at least two retaining wall printing units are suitable for printing on the surfaces of the connecting area and / or the non-connecting area of the flexible circuit board to form retaining walls; the printing unit comprises a printing needle; the printing units are arranged at intervals in the direction from the front end to the rear end. The filling glue printing unit and the retaining wall printing unit are arranged in a spaced mode in the direction from the front end to the rear end, and the filling glue printing unit is located between the rear end and the retaining wall printing unit and suitable for printing filling glue in the space among the retaining walls formed by the multiple printing units to form a circuit protection layer; the circuit protection layer at least covers the connection area. The circuit protection layer can effectively solve the problems that the film thickness uniformity of the circuit protection layer is poor, packaging is affected, and even the display effect is possibly affected.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a printing device and a forming method of a circuit protection layer of a display device. Background Art

[0002] In recent years, "high screen-to-body ratio" and even "full screen" design have gradually become the mainstream design of electronic products such as mobile phones, tablets, laptops and TVs. One of the most effective ways to increase the screen-to-body ratio is to bend the screen driver IC to the side or back of the OLED screen through a flexible circuit board. However, during the bending process, how to effectively protect the fragile metal wiring has become one of the most important links.

[0003] Usually, a metal cover layer (MCL) is formed on the connection area between the flexible circuit board and the display panel before bending to protect the metal traces in the connection area, enhance the resistance and durability of the flexible board, and reduce the risk of bright lines and other risks caused by damage to the metal traces in the connection area during the bending process and subsequent product use.

[0004] However, the circuit protection layer formed by the prior art will appear concave on the side close to the display panel, and then will slope sharply, and may overflow to the upper surface of the display panel, affecting subsequent packaging and even the display effect; and the film thickness uniformity of the protective layer is poor, so that when the flexible circuit board and the display panel are folded, the actual size of the part located at the bottom of the display device is greatly different from the designed size, and the poor uniformity will also affect the accuracy of the subsequent assembly process. Summary of the invention

[0005] Therefore, in order to solve the problem that the circuit protection layer has poor uniformity in film thickness, which affects packaging and may even affect display effects, the present invention provides a printing device and a forming method for a circuit protection layer of a display device.

[0006] The present invention provides a printing device for a circuit protection layer of a display device, wherein the display device comprises a display panel and a flexible circuit board on the side of the display panel, wherein the flexible circuit board has a connection area with the display panel and a non-connection area connected to the connection area; the printing device comprises: a main body bracket; the main body bracket has a front end and a rear end along a horizontal direction; at least two retaining wall printing units, suitable for printing on the surface of the connection area and / or the non-connection area to form retaining walls respectively; the printing unit comprises a printing needle; the printing unit is arranged at intervals in the direction from the front end to the rear end of the main body bracket; a filling glue printing unit is arranged at intervals from the retaining wall printing unit in the direction from the front end to the rear end of the main body bracket, is located between the rear end and the retaining wall printing unit, and is suitable for printing filling glue in the space between multiple retaining walls formed by multiple printing units to form the circuit protection layer; the circuit protection layer at least covers the connection area.

[0007] Optionally, the retaining wall printing unit is provided with a clamp for clamping the printing needle.

[0008] Optionally, the retaining wall printing unit is provided with a needle-dropping motion axis, which is parallel to the surface of the main support connected to the retaining wall printing unit and perpendicular to the horizontal direction; the clamp is suitable for moving along the needle-dropping motion axis.

[0009] Optionally, the printing pins of adjacent retaining wall printing units are spaced apart by a first spacing in a horizontal direction parallel to a surface of the main support connected to the retaining wall printing units, and the first spacing is adjustable.

[0010] Optionally, at least one of the adjacent retaining wall printing units is provided with a spacing adjustment axis, and the spacing adjustment axis is arranged in a horizontal direction parallel to the surface of the main bracket connected to the retaining wall printing unit, and is movably connected to the clamp; the clamp is suitable for horizontally moving along the spacing adjustment axis to adjust the first spacing.

[0011] Optionally, the retaining wall printing unit is further provided with a retaining wall curing component, which is spaced apart from the printing needle and connected to the clamp.

[0012] Optionally, there is a second spacing between the printing pins of adjacent printing units in a horizontal direction perpendicular to the surface of the main support connected to the retaining wall printing unit, and the second spacing is greater than the diameter of the printing pin.

[0013] Optionally, the main support is further provided with: a scanning unit, which is arranged near the front end; the scanning unit is used to scan the display device to measure the required size; a pretreatment unit, which is arranged between the scanning unit and the retaining wall printing unit; the pretreatment unit includes at least: at least one of a solvent wiping mechanism, a wind knife mechanism, and a plasma cleaning mechanism; a curing unit, which is arranged near the rear end; the filling glue curing unit includes at least an IR curing lamp or a UV curing lamp.

[0014] The present invention also provides a method for forming a circuit protection layer of a display device, the display device comprising a display panel and a flexible circuit board on the side of the display panel, the flexible circuit board having a connection area with the display panel and a non-connection area connected to the connection area; the circuit protection layer is formed using a printing device for the circuit protection layer of the display device provided by the present invention; the method for forming the circuit protection layer comprises the following steps: determining a predetermined coverage area of ​​the flexible circuit board, the predetermined coverage area at least covering the connection area; forming a first retaining wall on the side of the predetermined coverage area facing the display panel, and forming a second retaining wall on the side of the predetermined coverage area away from the display panel; the first retaining wall and the second retaining wall have the same height; the circuit protection layer is formed between the first retaining wall and the second retaining wall, and the circuit protection layer fills the space between the first retaining wall and the second retaining wall. In the process of forming the first retaining wall and the second retaining wall, the operating parameters of the printing pins of different retaining wall printing units are the same.

[0015] Optionally, during the process of the printing pin printing the first retaining wall and the second retaining wall, the printing pin moves along the width direction of the flexible circuit board for printing; the method for forming a circuit protection layer of the display device also includes the following steps: scanning the connection area along the width direction of the flexible circuit board to determine the range of side warping in the width direction of the connection area; according to the range of side warping, setting the printing parameters of the printing pin so that the height of the printing pin is adjusted during the movement of the printing pin along the width direction of the flexible circuit board to avoid the range of side warping.

[0016] Optionally, the printing needle starts printing after avoiding the side warping range when moving from the idle interval to above the connecting area; the printing needle ends printing before starting to avoid the side warping range when moving from above the connecting area to the idle interval.

[0017] Optionally, a second spacing is arranged between the printing pins of adjacent printing units in the horizontal direction perpendicular to the surface of the main support connected to the retaining wall printing unit, and the second spacing is greater than the diameter of the printing pin; during the process of the printing pin printing the first retaining wall and the second retaining wall, one printing unit starts printing first after the printing pin of the unit moves to the printing position, and the other printing unit moves to the printing position and starts printing after the first printing unit performs a partial printing action; the first printing unit completes the printing of the corresponding retaining wall first, and the second printing unit completes the printing of the corresponding retaining wall later.

[0018] The beneficial effects of the technical solution of the present invention are:

[0019] The circuit protection layer printing device of the display device provided by the present invention is provided with at least two retaining wall printing units, which can print two retaining walls in one step, form a first retaining wall close to the display panel and a second retaining wall away from the display panel on the flexible circuit board, take the position between the first retaining wall and the second retaining wall as the position covered by the circuit protection layer, and print the filling glue by the filling glue printing unit to form the circuit protection layer. The circuit protection layer formed in this way can make the size data of the two retaining walls equivalent by controlling the parameters, so that the filling glue will naturally level between the two retaining walls, and will not produce a sharp climbing phenomenon, and will not produce a depression, so that the film thickness of the formed circuit protection layer is highly uniform. Since there will be no sharp climbing, the overall film thickness of the circuit protection layer can also be reduced, and the required climbing width can also be reduced. And because the retaining wall close to the display panel exists, it will not climb to the surface of the display panel, and will not affect the subsequent packaging and even the display effect. And at least two printing units can print at least two retaining walls at one time in one step, without the need for sequential printing and formation as in single-needle printing, which can effectively improve the working efficiency. And the same operating parameters can be set by two printing needles, so that the size of the formed retaining wall can also be kept consistent to the greatest extent. It is more conducive to the thickness uniformity of the circuit protection layer.

[0020] The method for forming a circuit protection layer of a display device provided by the present invention uses the printing device provided by the present invention to print the circuit protection layer, and two retaining walls can be printed in one step, forming a first retaining wall close to the display panel and a second retaining wall away from the display panel on the flexible circuit board, and the position between the first retaining wall and the second retaining wall is used as the position covered by the circuit protection layer, and the filling glue is printed by the filling glue printing unit to form the circuit protection layer. The circuit protection layer formed in this way can control the parameters so that the size data of the two retaining walls are equivalent, so that the filling glue will naturally level between the two retaining walls, and will not produce a sharp climbing phenomenon, and will not produce depressions, so that the formed circuit protection layer has a strong uniformity of film thickness. Since no sharp climbing occurs, the overall film thickness of the circuit protection layer can also be reduced, and the required climbing width can also be reduced. And because the retaining wall close to the display panel exists, it will not climb to the surface of the display panel, and will not affect the subsequent packaging or even the display effect. And at least two printing units can print at least two retaining walls at one time in one step, without the need for sequential printing like single-needle printing, which can effectively improve the work efficiency. Furthermore, the same operating parameters can be set through two printing pins, so that the size of the formed retaining wall can be kept consistent to the greatest extent, which is more conducive to the uniformity of the thickness of the circuit protection layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a schematic diagram of the side view structure of the circuit protection layer in the prior art;

[0023] Figure 2 A schematic diagram of the top view structure of a circuit protection layer in the prior art;

[0024] Figure 3 A schematic side view of the structure of a circuit protection layer formed by using the printing device and printing method of the circuit protection layer of the display device of the present invention;

[0025] Figure 4 A schematic diagram of a top view of a circuit protection layer formed by using a printing device and a printing method for a circuit protection layer of a display device of the present invention;

[0026] Figure 5 A schematic structural diagram showing a state where a flexible circuit board of a display device is bent;

[0027] Figure 6It is a schematic diagram of the state when the retaining wall is formed in the method for forming the circuit protection layer of the display device of the present invention;

[0028] Figure 7 It is a schematic diagram of the state when a circuit protection layer is formed in the method for forming a circuit protection layer of a display device of the present invention;

[0029] Figure 8 A partial front view of a printing device for a circuit protection layer of a display device according to an embodiment of the present invention;

[0030] Fig. 9 for Figure 8 Side view of the structure;

[0031] Fig.10 A schematic diagram of a printing needle in a printing device for a circuit protection layer of a display device according to an embodiment of the present invention avoiding a warped area at an edge of a flexible circuit board;

[0032] Fig.11 A schematic diagram of a printing device for a circuit protection layer of a display device in operation according to an embodiment of the present invention;

[0033] Fig.12 FIG. 1 is a schematic diagram of a state in which two printing units perform asynchronous printing according to a setting of a second interval L in a method for forming a circuit protection layer of a display device according to an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1-display panel; 2-flexible circuit board; 21-connection area; 22-non-connection area; 31-first retaining wall; 32-second retaining wall; 33-circuit protection layer;

[0036] 100-main body bracket; 210, 220-retaining wall printing unit; 211, 221-printing needle; 212, 222-needle drop movement axis; 213, 223-clamp; 300-filling glue printing unit; 230-spacing adjustment axis; 240-retaining wall curing component; 300-filling glue printing unit; 400-scanning unit; 500-pretreatment unit; 600-filling glue curing unit. DETAILED DESCRIPTION

[0037] refer to Figure 1-Figure 2In the prior art method, the side of the display panel 1 is connected to the flexible circuit board 2, and the flexible circuit board 2 includes a connection area 21 connected to the display panel 1 and a non-connection area 22 that does not display the panel 1. A circuit protection layer 33 is formed on the connection area 21 to cover the connection area 21, thereby protecting the metal wiring in the connection area 21. In addition, a first retaining wall 31 is provided at a position away from the display panel 1 to prevent the fluid material forming the circuit protection layer 33 from flowing to the non-connection area and contaminating the devices in the non-connection area. In this way, due to the fluid properties of the material itself, the circuit protection layer presents a shape of first being concave and then climbing sharply on the side close to the display panel 1, and it is easy to climb to the surface of the display panel. The film layer thickness uniformity is poor, which may affect the subsequent packaging and even the display effect.

[0038] Therefore, the present invention provides a printing device and a forming method for a circuit protection layer of a display device to solve the problem that the circuit protection layer has poor film thickness uniformity, which affects packaging and may even affect display effects.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Example 1

[0044] refer to Figure 8-Figure 11 , and cooperate Figure 3-Figure 4 , this embodiment provides a printing device for a circuit protection layer of a display device.

[0045] The display device includes a display panel 1 and a flexible circuit board 2 on the side of the display panel. The flexible circuit board has a connection area 21 connected to the display panel 1 and a non-connection area 22 connected to the connection area 21. The connection area 21 is provided with metal traces to be protected.

[0046] The printing device comprises:

[0047] The main frame 100 has a front end and a rear end along the horizontal direction; Fig.11 For example, the left side of the figure is the front end and the right side of the figure is the back end.

[0048] At least two retaining wall printing units 210, 220 are adapted to print retaining walls on the surface of the connection area 21 and / or the non-connection area 22, respectively; the printing units include printing pins 211, 221; the printing units are arranged at intervals in the direction from the front end to the rear end of the main support;

[0049] The filling glue printing unit 300 is spaced apart from the retaining wall printing units 210 and 220 in the direction from the front end to the rear end of the main support 100, and is located between the rear end and the retaining wall printing unit. It is suitable for printing filling glue in the space between multiple retaining walls formed by multiple printing units to form the circuit protection layer; the circuit protection layer at least covers the connection area.

[0050] The device for printing the circuit protection layer of the display device provided in this embodiment is provided with at least two retaining wall printing units 210 and 220, and can print two retaining walls in one step. Figure 3 , Figure 4For example, a first retaining wall 31 close to the display panel 1 and a second retaining wall 32 away from the display panel 1 are formed on the flexible circuit board 2, and the position between the first retaining wall 31 and the second retaining wall 32 is used as the position covered by the circuit protection layer 33, and the filling glue printing unit 300 prints the filling glue to form the circuit protection layer 33. The circuit protection layer 33 formed in this way can control the parameters so that the size data of the first retaining wall 31 and the second retaining wall 32 are equivalent, so that the filling glue will naturally level between the two retaining walls, and will not produce a sharp climbing phenomenon, and will not produce a depression, so the formed circuit protection layer 33 has a strong uniformity of film thickness. Since there will be no sharp climbing, the overall film thickness of the circuit protection layer 33 can also be reduced, and the required climbing width can also be reduced. And because of the existence of the retaining wall close to the display panel 1, it will not climb to the surface of the display panel 1, and will not affect the subsequent packaging or even the display effect. And at least two printing units can print at least two retaining walls at one time in one step, without the need for sequential printing like single-needle printing, which can effectively improve the work efficiency. Furthermore, the same operating parameters can be set through two printing pins, so that the size of the formed retaining wall can be kept consistent to the greatest extent, which is more conducive to the uniformity of the thickness of the circuit protection layer.

[0051] In addition, the smaller the thickness and the slope width (the distance from the beginning of thickening to reaching the specified thickness) of the circuit protection layer 33, the smaller the bending area of ​​the flexible circuit board on the side of the display device can be. Figure 5 The bending area includes the connection area 21 of the flexible circuit board and the circuit protection layer 33 on its surface. After the flexible circuit board is bent and folded (i.e., the non-connection area 22 is parallel to and overlapped with the display panel 1, refer to Figure 5 The state shown in the figure) will serve as the "chin" of the display device (the dotted box area in the figure), protruding from the bottom of the display panel 1 and the non-connection area 22. It is easy to understand that the smaller the thickness of the circuit protection layer 33, the smaller the thickness of this part after folding. At the same time, because the thickness of the circuit protection layer 33 is reduced as a whole, it is not necessary to reach a very high thickness when printing the filling glue, so the distance from the beginning of thickening to reaching the specified thickness can be shortened, that is, the climbing width can be reduced, and the overall size of the circuit protection layer 33 can also be smaller. As a result, the size of the connection area 21 under the circuit protection layer 33 can also be designed to be smaller. Therefore, in general, the smaller the thickness and climbing width of the circuit protection layer 33, the smaller the bending area of ​​the flexible circuit board on the side of the device can be made.

[0052] For further reference, Figure 8 The retaining wall printing units 210 and 220 are provided with clamps 213 and 223 for clamping the printing pins 211 and 221.

[0053] For further reference, Figure 8The retaining wall printing units 210 and 220 are provided with needle drop motion shafts 212 and 222, which are parallel to the surface of the main frame 100 connected to the retaining wall printing units 210 and 220 and perpendicular to the horizontal direction; the clamps 213 and 223 are suitable for moving along the needle drop motion shafts 212 and 222. Thus, the printing needles 211 and 221 can be driven to move in the vertical direction.

[0054] For further reference, Figure 8 There is a first spacing between the printing pins 211 and 221 of the adjacent retaining wall printing units 210 and 220 in a horizontal direction parallel to the surface of the main support 100 connected to the retaining wall printing unit, and the first spacing is adjustable.

[0055] Specifically, at least one of the adjacent retaining wall printing units 210 and 220 is provided with a spacing adjustment shaft 230, for example, in this embodiment, 220 is provided with the spacing adjustment shaft 230. The spacing adjustment shaft 230 is arranged in a horizontal direction parallel to the surface of the main support 100 connected to the retaining wall printing unit, and is movably connected to the clamp 223 / 213 (223 in this embodiment, 213 in other embodiments, or both are provided with the spacing adjustment shaft 230); the clamp 223 is suitable for horizontal movement along the spacing adjustment shaft to adjust the first spacing. In this way, the first spacing can be adjusted according to design requirements, thereby controlling the size of the circuit protection layer.

[0056] For further reference, Figure 8 The retaining wall printing unit is also provided with a retaining wall curing component 240, which is spaced apart from the printing needle 211 and connected to the clamp. Figure 8 In the embodiment, a retaining wall curing component 240 is provided in the retaining wall printing unit 210, and a retaining wall curing component 240 can also be provided in the retaining wall printing unit 220, or both are provided. The retaining wall printing unit is provided with a retaining wall curing component 240, which can cure the material immediately after the printing needle prints the material, so that the retaining wall is quickly formed and the printing efficiency is improved. The retaining wall curing component can be, for example, a UV curing lamp.

[0057] For further reference, Fig. 9, there is a second spacing L between the printing pins of adjacent printing units in the horizontal direction perpendicular to the surface of the main support connected to the retaining wall printing unit, and the second spacing L is greater than the diameter of the printing pin. Since the horizontal dimension of the circuit protection layer 33 is sometimes small, it may be smaller than the sum of the radii of the two printing pins, that is, smaller than the diameter of one printing pin. In this case, the two printing pins cannot be printed synchronously side by side. Therefore, the two printing pins are staggered by setting the second spacing L. During the movement, one starts printing first and the other starts printing later, and the printing is completed asynchronously, which can meet the printing requirements of the small-sized circuit protection layer 33.

[0058] For further reference, Fig.11 The main body support is further provided with:

[0059] The scanning unit 400 is used to scan the display device on which the circuit protection layer is to be formed to measure the required size.

[0060] The pre-processing unit 500 is disposed between the scanning unit 400 and the retaining wall printing units 210 and 220 ; the pre-processing unit 500 at least includes: at least one of a solvent wiping mechanism, an air knife mechanism, and a plasma cleaning mechanism.

[0061] The filling glue curing unit 600 is arranged near the front end; the filling glue curing unit 600 at least includes an IR curing lamp or a UV curing lamp; and is used to cure the filling glue printed by the filling glue printing unit 300, so that the uncured filling glue is cured to form a circuit protection layer 33.

[0062] During actual operation, the display device A is carried on the carrier plate / conveyor belt B, and the printing device moves relatively along the length direction of the display device A. It first passes through the scanning unit 400 to scan the display device A and obtain relevant dimensional information. Then it passes through the pretreatment unit 500 for pretreatment such as solvent wiping, air knife surface cleaning, and plasma cleaning. Then, the retaining wall printing units 210 and 220 print the first retaining wall and the second retaining wall, and the size of the circuit protection layer is determined by the first spacing. Then, the printing device moves relatively along the width direction of the display device A to print the first retaining wall and the second retaining wall. Then, the filling glue printing unit 300 prints the circuit protection layer 33 in the space between the first retaining wall and the second retaining wall. Finally, the filling glue curing unit 600 cures the uncured circuit protection layer 33.

[0063] Comparison with existing technology Figure 1 , Figure 2 The circuit protection layer 33 printed by the printing device provided in this embodiment is as follows: Figure 3 , Figure 4For the structure shown, the prior art method can only achieve a circuit protection layer 33 thickness of 50±15μm and a climbing width of >150μm; while the method of this embodiment can achieve a circuit protection layer 33 thickness of 20±10μm and a climbing width ≤100μm.

[0064] Example 2

[0065] refer to Figure 6 , Figure 7 , combined with Figure 3 and Figure 4 This embodiment provides a method for forming a circuit protection layer of a display device. The circuit protection layer is formed using the printing device for the circuit protection layer of the display device provided in embodiment 1.

[0066] The display device includes a display panel 1 and a flexible circuit board 2 on the side of the display panel 1, wherein the flexible circuit board 2 has a connection area 21 connected to the display panel 1 and a non-connection area 22 connected to the connection area 21; the method for forming the circuit protection layer includes the following steps:

[0067] Determine a predetermined coverage area of ​​the flexible circuit board 2, wherein the predetermined coverage area at least covers the connection area 21;

[0068] like Figure 6 As shown, a first retaining wall 31 is formed on the side of the predetermined coverage area facing the display panel 1, and a second retaining wall 32 is formed on the side of the predetermined coverage area away from the display panel 1; the first retaining wall 31 and the second retaining wall 32 have the same height;

[0069] like Figure 7 As shown, the circuit protection layer 33 is formed between the first retaining wall 31 and the second retaining wall 32, and the circuit protection layer 33 fills the space between the first retaining wall 31 and the second retaining wall 32;

[0070] During the process of forming the first retaining wall 31 and the second retaining wall 32 , the operation parameters of the printing pins of different retaining wall printing units are the same.

[0071] The method for forming the circuit protection layer of the display device provided in this embodiment uses the printing device provided by the present invention to print the circuit protection layer, and two retaining walls can be printed in one step, forming a first retaining wall close to the display panel and a second retaining wall away from the display panel on the flexible circuit board, and the position between the first retaining wall and the second retaining wall is used as the position covered by the circuit protection layer, and the filling glue is printed by the filling glue printing unit to form the circuit protection layer. The circuit protection layer formed in this way can control the parameters to make the size data of the two retaining walls equivalent, so that the filling glue will naturally level between the two retaining walls, and will not produce a sharp climbing phenomenon, and will not produce a depression, so that the thickness uniformity of the film layer of the formed circuit protection layer is strong. Since there will be no sharp climbing, the overall thickness of the film layer of the circuit protection layer 33 can also be reduced, and the required climbing width can also be reduced. And because of the existence of the retaining wall close to the display panel, it will not climb to the surface of the display panel, and will not affect the subsequent packaging or even the display effect. And at least two printing units can print at least two retaining walls at one time in one step, without the need for sequential printing like single-needle printing, which can effectively improve the work efficiency. Furthermore, the same operating parameters can be set through two printing pins, so that the size of the formed retaining wall can be kept consistent to the greatest extent, which is more conducive to the uniformity of the thickness of the circuit protection layer.

[0072] Furthermore, during the process of printing the first retaining wall 31 and the second retaining wall 32 by the printing needle, the printing needle moves along the width direction of the flexible circuit board 2 for printing;

[0073] The method for forming a circuit protection layer of the display device further comprises the following steps:

[0074] Scanning the connection area 21 along the width direction of the flexible circuit board 2 to determine the range of the warping of the side edge of the connection area 21 in the width direction;

[0075] The printing parameters of the printing pin are set according to the range of the side warping, so that the height of the printing pin is adjusted to avoid the range of the side warping during the movement of the printing pin along the width direction of the flexible circuit board 2.

[0076] refer to Fig.10 Usually, the side of the flexible circuit board in the width direction has a certain degree of warping. Printing in this area will affect the printing effect and the shape of the retaining wall. In addition, the warping will block the print needle and cause errors in the printing process. Therefore, by pre-scanning and setting parameters, the print needle can avoid the warped area.

[0077] Furthermore, when the printing needle moves from the idle area to the top of the connection area, it starts printing after avoiding the range of the warped side; when the printing needle moves from the top of the connection area to the idle area, it ends printing before starting to avoid the range of the warped side. Since the warped area will not only block the printing needle, but also printing at the warped position will affect the final shape of the retaining wall, therefore, by pre-scanning and setting the operating parameters of the printing needle, the warped area is avoided and printed in the non-warped area. Fig.10 The dashed line range. Figure 4 It can also be seen from the figure that the retaining wall and the circuit protection layer do not cover the side area in the width direction. Although the circuit protection layer 33 will flow toward the side, it will eventually flow back to the middle due to the warping and will not flow out of the range of the flexible circuit board.

[0078] refer to Fig.12 , and combined with Fig. 9 As shown, a second spacing L is provided between the printing pins of adjacent printing units in a horizontal direction perpendicular to the surface of the main support 100 connecting the retaining wall printing units 210 and 220, and the second spacing L is greater than the diameter of the printing pins 211 and 221; during the process of the printing pins 211 and 221 printing the first retaining wall and the second retaining wall, one printing unit starts printing first after the printing pin of the unit moves to the printing position, and the other printing unit starts printing later after the first printing unit performs a partial printing action and moves to the printing position; the first printing unit completes the printing of the corresponding retaining wall first, and the second printing unit completes the printing of the corresponding retaining wall later. By setting the second spacing L, the two printing pins are staggered, and one starts printing first and the other starts printing later during the movement process, and the printing is completed asynchronously, which can meet the high-precision printing requirements of the small-sized circuit protection layer 33.

[0079] refer to Figure 5 During the printing of the retaining walls, by setting the second spacing L, the first retaining wall 31 starts printing first, and the second retaining wall 32 starts printing later. After the first retaining wall 31 starts printing a part, the second retaining wall 32 starts printing. Thus, asynchronous printing of the double retaining walls is achieved, and the situation where the two printing units interfere with each other can be avoided when the size of the circuit protection layer 33 is small.

[0080] A specific printing process of the metal circuit protection layer is as follows:

[0081] 1) Fill the retaining wall printing units 210 and 220 and the filling glue printing unit 300 with corresponding materials, and start the printing device.

[0082] 2) The display device A is carried on the carrier plate / conveyor belt B and transported to the preparation position, and the display device A is adjusted to be horizontal.

[0083] 3) Move the display device A to the scanning station, position the display device A, and then the scanning unit 400 scans the display device A to obtain relevant dimensions. Then calculate the relevant required parameters, such as the first spacing, the second spacing, the distance between the printing pin and the pin surface of the display device, the predetermined coverage area size, the height of the retaining wall, the thickness of the circuit protection layer, the side warping range, the compensation parameters, etc.

[0084] 4) Input the parameters into the printing device for setting, so that the relevant units are adjusted to the corresponding positions to meet the relevant setting parameters.

[0085] 5) The display device A is moved to the pre-treatment station, and the pre-treatment unit 500 performs pre-treatment on the display device A, including solvent wiping, air knife surface cleaning, plasma cleaning, etc.

[0086] 6) The display device A is moved to the retaining wall printing station, and the retaining wall printing units 210 and 220 perform asynchronous printing of the first retaining wall 31 and the second retaining wall 32, while the retaining wall curing component 240 performs curing along with the printing.

[0087] 7) The display device A is moved to the protection layer printing station, and the filling glue printing unit 300 prints the circuit protection layer 33 .

[0088] 8) The display device A is moved to the protective layer curing station, and the circuit protective layer 33 is cured by the filling glue curing unit 600 .

[0089] 9) The display device A is transported away from each workstation and unloaded from the carrier plate / conveyor belt B, ready for printing the circuit protection layer of the next display device A.

[0090] 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 printing device for a circuit protection layer of a display device, the display device comprising a display panel and a flexible circuit board on the side of the display panel, the flexible circuit board having a connection area with the display panel and a non-connection area connected to the connection area; characterized in that: The printing device comprises: The main body support has a front end and a rear end along the horizontal direction; At least two retaining wall printing units are adapted to print retaining walls on the surface of the connection area and / or the non-connection area respectively; the printing units include printing pins; the printing units are arranged at intervals in the direction from the front end to the rear end of the main support; A filling glue printing unit is spaced apart from the retaining wall printing unit in the direction from the front end to the rear end of the main support, and is located between the rear end and the retaining wall printing unit. It is suitable for printing filling glue in the space between multiple retaining walls formed by multiple printing units to form the circuit protection layer; the circuit protection layer at least covers the connection area.

2. The printing device for the circuit protection layer of the display device according to claim 1, characterized in that: The retaining wall printing unit is provided with a clamp for clamping the printing needle.

3. The printing device for the circuit protection layer of the display device according to claim 2, characterized in that: The retaining wall printing unit is provided with a needle-dropping motion axis, which is parallel to the surface of the main support connected to the retaining wall printing unit and perpendicular to the horizontal direction; the clamp is suitable for moving along the needle-dropping motion axis.

4. The printing device for the circuit protection layer of the display device according to claim 3, characterized in that: There is a first spacing between the printing pins of adjacent retaining wall printing units in a horizontal direction parallel to the surface of the main body bracket connected to the retaining wall printing units, and the first spacing is adjustable.

5. The printing device for the circuit protection layer of the display device according to claim 4, characterized in that: At least one of the adjacent retaining wall printing units is provided with a spacing adjustment axis, and the spacing adjustment axis is arranged in a horizontal direction parallel to the surface of the main bracket connected to the retaining wall printing unit, and is movably connected to the clamp; the clamp is suitable for horizontally moving along the spacing adjustment axis to adjust the first spacing.

6. The device for printing a circuit protection layer of a display device according to claim 2, characterized in that: The retaining wall printing unit is also provided with a retaining wall curing component, which is spaced apart from the printing needle and connected to the clamp.

7. The device for printing a circuit protection layer of a display device according to claim 3, characterized in that: There is a second spacing between the printing pins of adjacent printing units in a horizontal direction perpendicular to the surface of the main body bracket connected to the retaining wall printing unit, and the second spacing is greater than the diameter of the printing pin.

8. The device for printing a circuit protection layer of a display device according to any one of claims 2 to 7, characterized in that: The main body support is further provided with: A scanning unit is disposed near the front end; the scanning unit is used to scan the display device to measure the required size; A pre-treatment unit is arranged between the scanning unit and the retaining wall printing unit; the pre-treatment unit comprises at least one of a solvent wiping mechanism, an air knife mechanism, and a plasma cleaning mechanism; A filling glue curing unit is arranged near the rear end; the filling glue curing unit at least includes an IR curing lamp or a UV curing lamp.

9. A method for forming a circuit protection layer of a display device, wherein the display device comprises a display panel and a flexible circuit board on the side of the display panel, wherein the flexible circuit board has a connection area with the display panel and a non-connection area connected to the connection area; characterized in that: Using a printing device for a circuit protection layer of a display device according to any one of claims 1 to 8 to form the circuit protection layer; The method for forming the circuit protection layer comprises the following steps: Determining a predetermined coverage area of ​​the flexible circuit board, wherein the predetermined coverage area at least covers the connection area; A first retaining wall is formed on a side of the predetermined coverage area facing the display panel, and a second retaining wall is formed on a side of the predetermined coverage area away from the display panel; the first retaining wall and the second retaining wall have the same height; forming the circuit protection layer between the first retaining wall and the second retaining wall, wherein the circuit protection layer fills the space between the first retaining wall and the second retaining wall; During the process of forming the first retaining wall and the second retaining wall, the operation parameters of the printing pins of different retaining wall printing units are the same.

10. The method for forming a circuit protection layer of a display device according to claim 9, characterized in that: During the process of printing the first retaining wall and the second retaining wall by the printing pin, the printing pin moves along the width direction of the flexible circuit board for printing; The method for forming a circuit protection layer of the display device further comprises the following steps: Scanning the connection area along the width direction of the flexible circuit board to determine the range of warping of the side edge of the connection area in the width direction; The printing parameters of the printing pin are set according to the range of the side warping, so that the height of the printing pin is adjusted to avoid the range of the side warping during the movement of the printing pin along the width direction of the flexible circuit board.

11. The method for forming a circuit protection layer of a display device according to claim 10, characterized in that: When the printing needle moves from the idle area to above the connection area, the printing needle starts printing after avoiding the warped range of the side edge; When the printing needle moves from above the connection area to the idle area, the printing is finished before the printing needle starts to avoid the side warping range.

12. The method for forming a circuit protection layer of a display device according to claim 9, characterized in that: A second spacing is provided between the printing pins of adjacent printing units in a horizontal direction perpendicular to the surface of the main support connected to the retaining wall printing unit, and the second spacing is greater than the diameter of the printing pin; During the process of the printing pin printing the first retaining wall and the second retaining wall, one printing unit starts printing first after the printing pin of this unit moves to the printing position, and the other printing unit moves to the printing position and starts printing after the first printing unit performs a partial printing action; the first printing unit completes the printing of the corresponding retaining wall first, and the latter unit completes the printing of the corresponding retaining wall later.

Images