Apparatus for manufacturing a display device and method for manufacturing a display device

Abstract

Provided are an apparatus for manufacturing a display device and a method for manufacturing a display device. The apparatus for manufacturing a display device comprises: a main body, generating ultrasonic vibration; and a horn, comprising a horn main body portion and a horn tip portion, the horn main body portion being connected to the main body and amplifying the ultrasonic vibration, the horn tip portion being connected to the horn main body portion and applying the ultrasonic vibration to a bonding object, wherein the horn main body portion comprises at least one main body groove, the at least one main body groove being surrounded by the horn main body portion and completely penetrating the horn main body portion from a surface of the horn main body portion in a thickness direction.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0025165, filed on Mar. 5, 2019, which is hereby incorporated by reference for all purposes as if fully set forth herein. Technical Field

[0002] The present invention relates to an apparatus for manufacturing a display device and a method for manufacturing a display device. Background Art

[0003] A display device is a device for visually displaying data. Such a display device includes a substrate divided into a display area and a non-display area. A plurality of pixels are arranged on the substrate in the display area, and a plurality of pads (also referred to as "pads") are arranged on the substrate in the non-display area. The plurality of pads are connected to a flexible film (COF film) on which a drive circuit or the like is mounted to transmit a drive signal to the pixel.

[0004] The flexible film includes a plurality of leads connected to the plurality of pads, and each of the leads may be bonded to a separate pad. The bonding may be performed by an ultrasonic bonding process.

[0005] Meanwhile, an ultrasonic bonding process may be performed by an ultrasonic device that applies a predetermined vibration to the flexible film and the pad. However, when a welding head that applies the vibration of the ultrasonic device to the flexible film and the pad has a different vibration amplitude for each region, the bonding force between the lead wire and the pad may be different for each region. Therefore, a bonding failure of the display device may occur.

[0006] The above information disclosed in this Background section is only for understanding the background of the inventive concept and therefore it may contain information that does not constitute the prior art. Summary of the invention

[0007] Aspects of the present invention are to provide an apparatus for manufacturing a display device which applies vibration of the same amplitude to a joint portion of a display device for each region, and a method of manufacturing a display device.

[0008] Additional features of the inventive concepts will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the inventive concepts.

[0009] According to an exemplary embodiment of the inventive concept, an apparatus for manufacturing a display device includes: a main body, generating ultrasonic vibrations; and a welding head, including a welding head main body portion and a welding head terminal portion, the welding head main body portion is connected to the main body and amplifies the ultrasonic vibrations, and the welding head terminal portion is connected to the welding head main body portion and applies the ultrasonic vibrations to a bonding object, wherein the welding head main body portion includes at least one main body groove, and the at least one main body groove is surrounded by the welding head main body portion, and the welding head main body portion is completely penetrated from the surface of the welding head main body portion in the thickness direction.

[0010] The main body groove may include a main body through hole that completely penetrates the welding head main body from a surface of the welding head main body in a thickness direction.

[0011] The horn body may include a center line bisecting the horn body in a first direction, the body groove includes a first body groove disposed on the center line, and the first direction is a direction from the body toward the horn body.

[0012] The main body groove may also include a second main body groove and a third main body groove, the second main body groove is arranged on one side of the first main body groove in a second direction intersecting the first direction, the third main body groove is arranged on the other side of the first main body groove in the second direction, and the distance from the first main body groove to the second main body groove is equal to the distance from the first main body groove to the third main body groove.

[0013] A length of the first body groove in the first direction may be greater than a length of the second body groove in the first direction, and greater than a length of the third body groove in the first direction.

[0014] The welding head body may have a uniform thickness along the first direction.

[0015] The horn body portion may include at least one of a metal, a metal compound, a non-metallic inorganic compound, and an organic compound, and the horn tip portion has a uniform amplitude along the second direction during ultrasonic vibration of the horn tip portion.

[0016] The difference between the minimum amplitude of the horn tip and the maximum amplitude of the horn tip may be 5% or less of the maximum amplitude or the minimum amplitude.

[0017] The horn tip portion may include a first surface connected to the horn body portion and a second surface facing the first surface, and the horn tip portion includes a tip groove recessed from edges spaced apart from each other in a second direction of the second surface.

[0018] The terminal groove may be recessed in a direction from the second surface toward the first surface.

[0019] The body may include a power supply unit supplying power, a signal converter converting an electric signal of the supplied power into a vibration signal, and a vibration amplifier amplifying an amplitude of the vibration signal.

[0020] The bonding object may include a signal wiring disposed on the target panel and a lead wiring disposed on the printed circuit board, and the signal wiring and the lead wiring are ultrasonically bonded to each other.

[0021] The tip of the welding head may directly contact the printed circuit board and apply vibration to the printed circuit board.

[0022] According to an exemplary embodiment of the inventive concept, an apparatus for manufacturing a display device includes: a main body, generating ultrasonic vibrations; and a welding head, including a welding head main body portion and a welding head terminal portion, the welding head main body portion is connected to the main body and amplifies the ultrasonic vibrations, and the welding head terminal portion is connected to the welding head main body portion and applies the ultrasonic vibrations to a bonding object, wherein the welding head main body portion includes at least one main body groove, the at least one main body groove is surrounded by the welding head main body portion and completely penetrates the welding head main body portion from the surface of the welding head main body portion in a thickness direction, the welding head terminal portion includes a lower surface facing the bonding object, and the lower surface of the welding head terminal portion has a curved shape.

[0023] The curved shape of the lower surface may have a predetermined curvature.

[0024] According to an exemplary embodiment of the inventive concept, a method for manufacturing a display device includes: placing a target panel including a pad area provided with multiple signal wirings and a flexible printed circuit board including multiple lead wirings on the pad area of ​​the target panel; and placing an ultrasonic bonding device on the flexible printed circuit board, and placing a welding head end portion to contact the flexible printed circuit board to transmit ultrasonic vibrations to the flexible printed circuit board, the ultrasonic bonding device includes a main body and a welding head, the main body generates ultrasonic vibrations, the welding head includes a welding head main body portion connected to the main body and amplifying the ultrasonic vibrations and a welding head end portion connected to the welding head main body portion and applying the ultrasonic vibrations to the bonding object, wherein the welding head main body portion includes at least one main body groove, and the at least one main body groove is surrounded by the welding head main body portion.

[0025] Placing the target panel and the flexible printed circuit board may include placing the signal wiring and the lead wiring corresponding to each other in a thickness direction to directly contact each other, and transmitting the ultrasonic vibration includes ultrasonically bonding the signal wiring to the lead wiring.

[0026] Multiple signal wirings can be arranged along a first direction, the vibration direction of the ultrasonic vibration transmitted by the ultrasonic bonding device is a second direction intersecting the first direction, and the area of ​​the ultrasonic bonding device contacting the flexible printed circuit board has a uniform vibration amplitude along the first direction, and the difference between the maximum value of the vibration amplitude and the minimum value of the vibration amplitude is 5% or less of the maximum value or the minimum value of the vibration amplitude.

[0027] The body groove may include a body through hole, the body through hole completely penetrates the horn body part from a surface of the horn body part in a thickness direction, and the horn body part has a uniform thickness along the second direction.

[0028] The welding head tip portion may include a first surface connected to the welding head body portion and a second surface facing the first surface, the welding head tip portion includes a terminal groove recessed from edges spaced apart from each other in a first direction along the second surface, and the terminal groove is recessed in a direction from the second surface toward the first surface and terminates in the welding head tip portion.

[0029] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings illustrate exemplary embodiments of the invention and together with the description serve to explain the inventive concept. The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification.

[0031] Figure 1 is a perspective view of an apparatus for manufacturing a display device according to an exemplary embodiment.

[0032] Figure 2 is a block diagram illustrating operations of components of an apparatus for manufacturing a display device.

[0033] Figure 3 is a plan view of a welding head body portion and a welding head tip portion of an apparatus for manufacturing a display device according to an exemplary embodiment.

[0034] Figure 4 is a side view of a welding head body portion and a welding head tip portion of an apparatus for manufacturing a display device according to an exemplary embodiment.

[0035] Figure 5 is a front view of a welding head body portion and a welding head tip portion of an apparatus for manufacturing a display device according to an exemplary embodiment.

[0036] Figure 6 is a flowchart of a method of manufacturing a display device according to another exemplary embodiment.

[0037] Figure 7 is a perspective view illustrating bonding of bonding objects by a manufacturing apparatus for a display device according to another exemplary embodiment.

[0038] Figure 8 is a perspective view showing a signal wiring and a lead wiring combined with each other.

[0039] Fig. 9 It is along Figure 8 A cross-sectional view taken along line VIII-VIII'.

[0040] Fig.10 It is a plan view showing the maximum vibration amplitude and the minimum vibration amplitude of the horn tip portion when bonding objects to be bonded.

[0041] Fig.11A and Fig. 11B is a diagram showing vibration amplitudes of respective regions of a manufacturing apparatus for a display device.

[0042] Fig.12 is a perspective view of an apparatus for manufacturing a display device according to another exemplary embodiment.

[0043] Fig.13 is a side view of a welding head main body portion and a welding head tip portion of an apparatus for manufacturing a display device according to another exemplary embodiment.

[0044] Fig.14 is a front view of a welding head main body portion and a welding head tip portion of an apparatus for manufacturing a display device according to another exemplary embodiment.

[0045] Fig.15A and Fig. 15B is a view showing vibration amplitudes of respective regions of an apparatus for manufacturing a display device.

[0046] Fig.16 is a front view of a welding head main body portion and a welding head tip portion of an apparatus for manufacturing a display device according to still another exemplary embodiment.

[0047] Fig.17 is a front view of a welding head main body portion and a welding head tip portion of an apparatus for manufacturing a display device according to still another exemplary embodiment.

[0048] Fig.18 is a front view of a welding head main body portion and a welding head tip portion of an apparatus for manufacturing a display device according to still another exemplary embodiment.

[0049] Fig.19 is a perspective view of an apparatus for manufacturing a display device according to still another exemplary embodiment.

[0050] Fig. 20 is a side view of a welding head main body portion and a welding head tip portion of an apparatus for manufacturing a display device according to still another exemplary embodiment.

[0051] Fig.21 is a perspective view illustrating bonding of bonding objects by an apparatus for manufacturing a display device according to still another exemplary embodiment.

[0052] Fig.22A and Fig. 22B is a side view illustrating bonding of bonding objects by an apparatus for manufacturing a display device according to still another exemplary embodiment.

[0053] Fig.23 is a perspective view of a welding head body portion and a welding head tip portion of an apparatus for manufacturing a display device according to another exemplary embodiment. DETAILED DESCRIPTION

[0054] In the following description, for the purpose of explanation, many specific details are set forth to provide a thorough understanding of various exemplary embodiments or implementations of the invention. As used herein, "embodiment" and "implementation" are interchangeable words, which are non-limiting examples of devices or methods using one or more of the inventive concepts disclosed herein. However, it is apparent that various exemplary embodiments can be practiced without these specific details or with one or more equivalent arrangements. In other cases, well-known structures and devices are shown in block diagram form to avoid unnecessarily obscuring various exemplary embodiments. In addition, various exemplary embodiments may be different, but need not be exclusive. For example, without departing from the inventive concept, the specific shape, construction and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0055] Unless otherwise specified, the exemplary embodiments shown will be understood as providing exemplary features of the details of the changes in some ways of implementing the inventive concept in practice. Therefore, unless otherwise specified, the features, components, modules, layers, films, panels, regions and / or aspects, etc. (hereinafter individually or collectively referred to as "elements") of the various embodiments may be further combined, separated, interchanged and / or rearranged without departing from the inventive concept.

[0056] The use of cross hatching and / or shading is usually provided in the drawings to make the boundaries between adjacent elements clear. Thus, unless otherwise specified, the presence or absence of cross hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, ratio, commonality between the elements shown, and / or any other characteristics, attributes, properties, etc. of the elements. In addition, in the drawings, the size and relative size of the elements may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments may be implemented differently, a specific process sequence may be performed differently from the described sequence. For example, two processes described in succession may be performed substantially simultaneously or in an order opposite to the described sequence. In addition, the same reference numerals represent the same elements.

[0057] When an element, such as a layer, is referred to as being "on," "connected to," or "bonded to" another element or layer, the element may be directly on, directly connected to, or directly bonded to the other element or layer, or there may be intervening elements or layers. However, when an element or layer is referred to as being "directly on," "directly connected to," or "directly bonded to" another element or layer, there are no intervening elements or layers. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, and / or a fluid connection with or without intervening elements. In addition, the DR1 axis, the DR2 axis, and the DR3 axis are not limited to the three axes of a rectangular coordinate system, such as the x-axis, the y-axis, and the z-axis, and may be interpreted in a broader sense. For example, the DR1 axis, the DR2 axis, and the DR3 axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purpose of this disclosure, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as XYZ, XYY, YZ, and ZZ for example. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0058] Although the terms "first", "second", etc. can be used here to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another element. Therefore, without departing from the disclosed teachings, the first element discussed below can be named as the second element.

[0059] Spatially relative terms such as "under," "below," "under," "down," "above," "up," "above," "higher," "side" (e.g., as in "sidewall"), etc. may be used herein for descriptive purposes, and thereby describe the relationship of one element to another (other) element as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "below" or "beneath" other elements or features would subsequently be positioned as being "above" the other elements or features. Thus, the exemplary term "under" may encompass both above and below orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

[0060] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one", "one (kind / person)" and "the (said)" are intended to also include plural forms. In addition, the terms "including", "comprising" and "including" when used in this specification indicate the existence of stated features, integral bodies, steps, operations, elements, components and / or combinations thereof, but do not exclude the existence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or combinations thereof. It is also noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms rather than degree terms, so that they are used to explain the inherent deviations of measured values, calculated values ​​and / or provided values ​​that will be recognized by those of ordinary skill in the art.

[0061] Various exemplary embodiments are described herein with reference to cross-sectional views and / or exploded views as schematic diagrams of idealized exemplary embodiments and / or intermediate structures. As such, variations in the shapes of the diagrams caused by, for example, manufacturing techniques and / or tolerances are anticipated. Therefore, the exemplary embodiments disclosed herein should not necessarily be interpreted as being limited to the specific illustrated shapes of the regions, but rather include deviations in shapes caused by, for example, manufacturing. In this manner, the regions shown in the drawings may be schematic in nature, and the shapes of these regions may not reflect the actual shapes of the regions of the device, and as such, are not necessarily intended to be restrictive.

[0062] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure is a part. Terms (such as those defined in general dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense unless explicitly so defined herein.

[0063] Figure 1 is a perspective view of an apparatus for manufacturing a display device according to an exemplary embodiment, Figure 2 is a block diagram illustrating the operation of components of an apparatus for manufacturing a display device, Figure 3 is a plan view of a welding head main body portion and a welding head tip portion of an apparatus for manufacturing a display device according to an exemplary embodiment, Figure 4 is a side view of a welding head main body portion and a welding head tip portion of an apparatus for manufacturing a display device according to an exemplary embodiment, Figure 5 is a front view of a welding head body portion and a welding head tip portion of an apparatus for manufacturing a display device according to an exemplary embodiment.

[0064] The apparatus for manufacturing a display device (also referred to as a display device manufacturing apparatus) 10 according to an exemplary embodiment may be a bonding apparatus for bonding a signal wiring of a display panel disposed on a joint portion of the display device to a lead wiring of a flexible printed circuit board. More specifically, the apparatus for manufacturing a display device 10 according to an exemplary embodiment may be an ultrasonic bonding apparatus designed so that the applied ultrasonic frequency matches the resonant frequency of the apparatus 10 for manufacturing a display device. The ultrasonic bonding apparatus may directly bond the signal wiring of the display panel to the lead wiring of the flexible printed circuit board. That is, the signal wiring and the lead wiring may be directly bonded to each other by ultrasonic bonding.

[0065] The applied ultrasonic frequency matches the resonance frequency, and the ultrasonic bonding device can effectively bond the signal wiring and the lead wiring to each other.

[0066] A display device, which is a device for displaying moving images or still images, can be used as a display screen for various products such as televisions, notebook computers, monitors, billboards, and the Internet of Things, as well as portable electronic appliances (such as mobile phones, smart phones, tablet personal computers (tablet PCs), smart watches, watch phones, mobile communication terminals, electronic notebooks, e-books, portable multimedia players (PMPs), navigators, and ultra-mobile PCs).

[0067] For example, the display device can be at least one of a liquid crystal display (LCD), a quantum dot organic light-emitting display (QD-OLED), a quantum dot liquid crystal display (QD-LCD), a quantum nano-luminescent display (NanoLED), and a micro-luminescent display (micro-LED).

[0068] Reference Figures 1 to 5 , the apparatus 10 for manufacturing a display device according to an exemplary embodiment includes a body 20 and a welding head 30 connected to the body 20. The welding head 30 includes a welding head connection part 31 physically connected to the body 20, a welding head main body part 33 connected to the welding head connection part 31, and a welding head terminal part 35 connected to the welding head main body part 33.

[0069] The body 20 is used to transmit a vibration signal to the welding head 30. The vibration signal may be vibration energy.

[0070] The welding head connection portion 31 of the welding head 30 may be physically connected to the main body 20 through the connection portion CP of the main body 20 .

[0071] The horn body portion 33 of the horn 30 may be used to transmit the vibration signal received from the body 20 to the horn tip portion 35 of the horn 30 .

[0072] The welding head end portion 35 of the welding head 30 can bond the bonding object by receiving the vibration signal from the welding head body portion 33. That is, the welding head end portion 35 can be used to apply the vibration signal directly to the flexible printed circuit film of the bonding part of the display device to directly bond the signal wiring to the lead wiring.

[0073] Reference Figure 2 , a main body 20 of an apparatus 10 for manufacturing a display device includes a power supply unit 21 generating an electric signal, a signal converter 23 converting the electric signal received from the power supply unit 21 into a vibration signal, and a vibration amplifier 25 amplifying the vibration amplitude of the vibration signal.

[0074] The power supply unit 21 receives power from an external power supply. The power supply unit 21 may convert the power received from the external power supply into an electrical signal. The electrical signal converted by the power supply unit 21 may be transmitted to the signal converter 23. The electrical signal may have a higher frequency than the power. For example, the frequency of the power may be about 60 Hz, and the frequency of the electrical signal may be about 20 kHz, 35 kHz, or 40 kHz, but the inventive concept is not limited thereto.

[0075] The signal converter 23 converts the electric signal received from the power supply unit 21 into a vibration signal, and transmits the vibration signal to the vibration amplifier 25. The vibration signal may have Figure 2 The vibration signal causes the welding head 30 to vibrate, and the vibration direction of the vibration signal can be as follows: Figure 1 The second direction DR2 is shown in FIG.

[0076] The vibration amplifier 25 amplifies the amplitude of the vibration signal received from the signal converter 23 and transmits the amplified vibration signal to the welding head 30. The amplified vibration signal may have a value such as Figure 2 The frequency of wave 2wav is equal to the frequency of the aforementioned wave 1wav, but the amplitude of wave 2wav can be greater than the amplitude of wave 1wav.

[0077] The welding head body part 33 of the welding head 30 can transmit the amplified vibration signal received from the vibration amplifier 25 to the welding head end part 35 of the welding head 30. The welding head body part 33 can transmit the vibration signal having the same amplitude strength as the amplitude strength of the amplified vibration signal received from the vibration amplifier 25 to the welding head end part 35 as it is, but the inventive concept is not limited thereto, and the welding head body part 33 amplifies the amplified vibration signal received from the vibration amplifier 25, and transmits the vibration signal having an amplitude strength greater than the amplitude strength of the amplified vibration signal to the welding head end part 35.

[0078] The horn tip portion 35 of the horn 30 may bond the bonding objects by receiving the vibration signal from the horn body portion 33 .

[0079] As described above, the bonding object may include: the display panel 100 including the display substrate 101 and the signal wiring PAD disposed on the display substrate 101 ; and the flexible printed circuit board 300 including the base substrate 301 and the lead wiring LE disposed on the base substrate 301 .

[0080] When the welding head 30 vibrates along the second direction DR2 using the amplified vibration signal received from the vibration amplifier 25, the welding head tip portion 35 may vibrate along the first direction DR1 with amplitudes different from each other. The reason for this is that when the amplified vibration signal applied to the welding head 30 is very large, the welding head 30 exhibits elastic behavior over the entire area along the first direction DR1.

[0081] The welding head 30 may include a material that exhibits elastic behavior when an amplified vibration signal is applied. For example, the welding head 30 may include a metal, a metal compound, a non-metallic inorganic compound, or an organic compound. For example, the welding head 30 may include a metal such as tungsten (W), copper (Cu), silver (Ag), gold (Au), platinum (Pt), aluminum (Al), iron (Fe), or titanium (Ti), an oxide thereof, a nitride thereof, a halogen compound thereof, or a combination alloy thereof.

[0082] Therefore, the horn body 33 of the horn 30 may be provided therein with horn grooves TH1, TH2, and TH3 surrounded by the horn body 33 so that the horn body 33 vibrates with the same amplitude along the first direction DR1. The horn grooves TH1 to TH3 may be arranged to be spaced apart from each other along the first direction DR1.

[0083] The horn grooves TH1 to TH3 may be completely surrounded by the constituent material of the horn body portion 33. The horn grooves TH1 to TH3 may include through holes that completely penetrate the horn body portion 33 from the surface of the horn body portion 33 in the thickness direction.

[0084] The welding head grooves TH1 to TH3 can allow the welding head 30 of the display device manufacturing apparatus 10 to which the vibration signal is applied to have the same amplitude for each region thereof. Therefore, the welding head 30 of the display device manufacturing apparatus 10 can apply the vibration signal having the vibration amplitude for each region to the bonding object to prevent bonding failure of the bonding object.

[0085] More specifically, the welding head body 33 of the welding head 30 includes long side edges LEG1 and LEG2 extending along the first direction DR1 and short side edges SEG1 and SEG2 extending along the second direction DR2. The welding head body 33 may further include a reference line CL for dividing the long side edges LEG1 and LEG2 equally.

[0086] The first horn groove TH1 of the horn body part 33 may be disposed to overlap with the reference line CL of the horn body part 33. That is, the first horn groove TH1 may be disposed at the center of the horn body part 33 in the first direction DR1.

[0087] Assuming that the vibration energy caused by the vibration signal applied to the horn body 33 is constant, the mass of the horn body 33 may be inversely proportional to its vibration amplitude. When the first horn slot TH1 may be disposed at the center of the horn body 33, the mass of the central region of the horn body 33 is reduced to increase the vibration amplitude of the central region, thereby increasing the vibration amplitude of the central region of the horn tip 35.

[0088] The second welding head slot TH2 may be disposed at one side of the first welding head slot TH1 in the first direction DR1, and the third welding head slot TH3 may be disposed at the other side of the first welding head slot TH1 in the first direction DR1. That is, the third welding head slot TH3 may be separated from the second welding head slot TH2, and the first welding head slot TH1 is located between the third welding head slot TH3 and the second welding head slot TH2.

[0089] Similar to the first horn slot TH1, each of the second horn slot TH2 and the third horn slot TH3 increases the vibration amplitude of the horn body portion 33 to increase the vibration amplitude of the central area of ​​the horn tip portion 35. That is, even when the first horn slot TH1 increases the vibration amplitude of the central area of ​​the horn body portion 33 to increase the vibration amplitude of the central area of ​​the horn tip portion 35, the increase in vibration amplitude is small around the central areas of the horn body portion 33 and the horn tip portion 35. For the purpose of preventing this problem, the second horn slot TH2 and the third horn slot TH3 are arranged at one side and the other side of the first horn slot TH1 in the first direction DR1, thereby allowing the horn body portion 33 and the horn tip portion 35 to have a uniform vibration amplitude over the entire area in the first direction DR1.

[0090] like Figure 3 As shown in , the distance between the second horn groove TH2 and the first horn groove TH1 may be equal to the distance between the third horn groove TH3 and the first horn groove TH1. That is, the horn grooves TH1 to TH2 of the horn body portion 33 may be symmetrically arranged along the first direction DR1 of the horn body portion 33 in a plan view. Therefore, it is possible to prevent uneven vibration amplitude from occurring when the horn grooves TH1, TH2, and TH3 are irregularly arranged, so that uniform vibration amplitude is applied to the entire area of ​​the horn body portion 33 and the horn tip portion 35.

[0091] The length L of the first welding head slot TH1 in the second direction DR2 th1It may be about 0.2 to about 0.8 times the length L33 of the welding head body 33 in the second direction DR2. th1 When the length L33 of the horn body 33 in the second direction DR2 is about 0.2 times or more, the vibration amplitude of the horn body 33 and the horn tip 35 can be effectively increased. th1 When the welding head body portion 33 is approximately 0.8 times or less of the length L33 in the second direction DR2, the vibration amplitude of the central area of ​​the welding head body portion 33 and the welding head terminal portion 35 is larger than the vibration amplitude of the peripheral area of ​​the welding head body portion 33 and the welding head terminal portion 35, thereby preventing uneven vibration amplitude over the entire area of ​​the welding head body portion 33 and the welding head terminal portion 35.

[0092] The length L of the first welding head slot TH1 in the second direction DR2 th1 The length L of the adjacent second welding head slot TH2 in the second direction DR2 may be th2 or the length L of the adjacent third welding head slot TH3 in the second direction DR2 th3 However, the inventive concept is not limited thereto, and the length L th1 Can be equal to the length L th2 or length L th3 .

[0093] Although in Figure 3 3, but the number of the welding head grooves in the welding head body part 33 may be changed according to the length of the second long side edge LEG2 of the welding head body part 33 in the first direction DR1. For example, when the length of the second long side edge LEG2 of the welding head body part 33 is about 80 mm to about 135 mm, the number of the welding head grooves may be 2 to 4. When the number of the welding head grooves is three, the arrangement of the welding head grooves TH1 to TH3 may be applied. In addition, when the number of the welding head grooves is two, the arrangement of the welding head grooves TH1 to TH3 may be applied. Figure 3 The second welding head slot TH2 and the third welding head slot TH3 shown in the figure are used, and the first welding head slot TH1 may not be applied. When the number of welding head slots is four, these welding head slots are arranged at regular intervals along the first direction DR1. In this case, in each welding head slot, the shape and size of the first welding head slot TH1 or the second welding head slot TH2 may be applied, but the inventive concept is not limited.

[0094] In some exemplary embodiments, when the length of the second long side edge LEG2 of the horn body portion 33 is about 45 mm or less, the number of horn grooves may be one. That is, when one horn groove is applied, the first horn groove TH1 may be applied, and the second horn groove TH2 and the third horn groove TH3 may not be applied.

[0095] In some exemplary embodiments, when the length of the second long side edge LEG2 of the welding head body portion 33 is about 45 mm to about 80 mm, the number of welding head grooves can be one or two. That is, when one welding head groove is applied, Figure 3 The first welding head slot TH1 is shown and may not be applied Figure 3 The second welding head slot TH2 and the third welding head slot TH3 shown in FIG. 1 can be used when two welding head slots are used. Figure 3 The second welding head slot TH2 and the third welding head slot TH3 shown in FIG. Figure 3 The first welding head slot TH1 is shown in FIG.

[0096] In some exemplary embodiments, when the length of the second long side edge LEG2 of the welding head body part 33 is about 135 mm or more, the number of welding head grooves may be four. The respective welding head grooves may be arranged at regular intervals along the first direction DR1. In this case, each of the welding head grooves may have the same shape and size as the first welding head groove TH1 or the second welding head groove TH2, but the inventive concept is not limited thereto.

[0097] Reference Figure 4 , the horn body portion 33 according to the exemplary embodiment may have a uniform thickness h33 along the third direction DR3. For example, the ratio of the minimum thickness of the horn body portion 33 to the maximum thickness of the horn body portion 33 may be about 0.9 to about 1. One end of the horn body portion 33 adjacent to the horn tip portion 35 in the second direction DR2 may have the minimum thickness of the horn body portion 33, and the other end of the horn body portion 33 facing the one end of the horn body portion 33 in the second direction DR2 may have the maximum thickness of the horn body portion 33.

[0098] That is, as described above, the mass of the horn body portion 33 is inversely proportional to its vibration amplitude. When a thickness difference occurs in an area along the second direction DR2 of the horn body portion 33, an increase in the vibration amplitude due to a reduction in mass increases in some areas. A vibration signal having an uneven vibration amplitude occurring due to a thickness difference in an area of ​​the horn body portion 33 along the second direction DR2 may be transmitted to the horn tip portion 35 through a reinforcing action and / or a canceling action to have an uneven vibration amplitude over the entire area of ​​the horn body portion 33 and the horn tip portion 35.

[0099] The horn body portion 33 according to the exemplary embodiment has a uniform thickness h33 along the second direction DR2 to have a uniform vibration amplitude over the entire areas of the horn body portion 33 and the horn tip portion 35 in the first direction DR1 .

[0100] Hereinafter, a method of manufacturing a display device according to another exemplary embodiment will be described. In the following exemplary embodiments, the same reference numerals as those in the aforementioned exemplary embodiments are denoted by the same reference numerals, and descriptions thereof will be omitted or simplified.

[0101] Figure 6 is a flowchart of a method of manufacturing a display device according to another exemplary embodiment, Figure 7 is a perspective view showing bonding of bonding objects by an apparatus for manufacturing a display device according to another exemplary embodiment, Figure 8 is a perspective view showing signal wiring and lead wiring combined with each other, Fig. 9 It is along Figure 8 A cross-sectional view taken along line VIII-VIII', Fig.10 is a plan view showing the maximum vibration amplitude and the minimum vibration amplitude of the welding head tip when bonding the bonding object. Fig.11A and Fig. 11B is a view showing vibration amplitudes of respective regions of an apparatus for manufacturing a display device.

[0102] Fig.10 is a plan view showing the maximum vibration amplitude and the minimum vibration amplitude of the welding head tip when bonding the bonding object. Fig.11A and Fig. 11B is a view showing vibration amplitudes of respective regions of an apparatus for manufacturing a display device. Fig.11A It shows the vibration amplitude of the horn tip portion 35 of the apparatus 10 for manufacturing a display device for each region in the first direction DR1 when the apparatus 10 for manufacturing a display device does not include the horn grooves TH1 , TH2 , and TH3 .

[0103] Reference Figures 6 to 10 as well as Fig.11A and Fig. 11B In a method of manufacturing a display device according to another exemplary embodiment, the display device is manufactured using the aforementioned display device manufacturing apparatus 10 (hereinafter, for ease of explanation, the apparatus for manufacturing a display device will be described as a display device manufacturing apparatus).

[0104] First, a target panel and a flexible printed circuit board are arranged, the target panel includes a pad area PA provided with a plurality of signal wirings PAD, and the flexible printed circuit board includes a plurality of lead wirings LE on the pad area PA of the target panel (S10). The target panel may be the aforementioned bonding object. The bonding object may include a signal wiring PAD provided on the display substrate 101 and a lead wiring LE provided on the base substrate 301.

[0105] The step S10 of arranging the flexible printed circuit board may include the step of arranging the signal wiring PAD and the lead wiring LE to correspond to each other in the thickness direction (ie, the third direction DR3 ) to be in direct contact with each other.

[0106] More specifically, the display substrate 101 may include a display area DA for displaying an image and a pad area PA located around the display area DA. A plurality of signal wirings PAD disposed on the display substrate 101 may be disposed on the pad area PA of the display substrate 101. The plurality of signal wirings PAD and the plurality of lead wirings LE may be arranged along a first direction DR1.

[0107] Subsequently, the display device manufacturing apparatus 10 is positioned to contact the flexible printed circuit board 300 to transmit ultrasonic vibration (S20). As described above, the plurality of signal wirings PAD may be arranged along the first direction DR1, and the vibration direction of the ultrasonic vibration transmitted by the display device manufacturing apparatus 10 may be the second direction DR2 crossing the first direction DR1.

[0108] The welding head end portion 35 of the display device manufacturing equipment 10 can be set on the upper surface of the flexible printed circuit board 300, can be in direct contact with the base substrate 301, and can ultrasonically apply the vibration signal in the second direction DR2 to the signal wiring PAD and the lead wiring LE. In addition, the welding head end portion 35 can apply pressure in the downward direction through the base substrate 301 to further promote the contact between the signal wiring PAD and the lead wiring LE. That is, the welding head end portion 35 can have a vibration amplitude in the second direction DR2, and can make the signal wiring PAD and the lead wiring LE ultrasonically vibrate with each other. The base substrate 301 in contact with the welding head end portion 35 can vibrate substantially simultaneously with the welding head end portion 35 in the vibration direction of the welding head end portion 35 (for example, in the second direction DR2). Therefore, the signal wiring PAD and the lead wiring LE can be ultrasonically combined by the display device manufacturing equipment 10.

[0109] The area of ​​the display device manufacturing apparatus 10 contacting the flexible printed circuit board 300 may have a uniform vibration amplitude along the first direction DR1, and specifically, the difference between the maximum value and the minimum value of the vibration amplitude may be 5% or less of the maximum value or the minimum value.

[0110] The display substrate 101 may be a rigid substrate including a rigid material such as glass or quartz. However, the inventive concept is not limited thereto, and the display substrate 101 may be a flexible substrate including a flexible material such as polyimide (PI).

[0111] The signal wiring PAD may include at least one of molybdenum (Mo), aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), titanium (Ti), tantalum (Ta), tungsten (W), and copper (Cu). The signal wiring PAD may be a single film made of the illustrated material. However, the inventive concept is not limited thereto, and the signal wiring PAD may be a laminated film.

[0112] The base substrate 301 may include a flexible organic insulating material. For example, the base substrate 301 may include a base film.

[0113] The lead wiring LE may include a metal material. The lead wiring LE may include at least one metal selected from molybdenum (Mo), aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), titanium (Ti), tantalum (Ta), tungsten (W), and copper (Cu).

[0114] Subsequently, the signal wiring PAD and the lead wiring LE corresponding to each other in the thickness direction are ultrasonically bonded by ultrasonic vibration generated from the ultrasonic bonding device (S30). The step of ultrasonically bonding the signal wiring PAD and the lead wiring LE may include the following steps: at least partially melting the signal wiring PAD and the lead wiring LE at the mutual interface, and solidifying and bonding the melted products.

[0115] More specifically, when the lead wiring LE ultrasonically vibrates on one surface of the signal wiring PAD, a predetermined friction force is generated at the interface between one surface of the signal wiring PAD and one surface of the lead wiring LE, and friction heat can be generated due to the friction force. When the friction heat is sufficient to melt the materials constituting the signal wiring PAD and the lead wiring LE, the pad melting region of the signal wiring PAD adjacent to the lead wiring LE and the lead melting region of the lead wiring LE adjacent to the signal wiring PAD can be melted respectively. That is, the signal wiring PAD may include a pad non-melting region and a pad melting region. In addition, the lead wiring LE may include a lead non-melting region and a lead melting region.

[0116] The pad non-melting region may be a region including only a material included in the signal wiring PAD. The lead non-melting region may be a region including only a material included in the lead wiring LE.

[0117] The pad melting region is a region where the material included in the lead wiring LE diffuses and thus the material of the signal wiring PAD and the material of the lead wiring LE are mixed with each other. The lead melting region is a region where the material included in the signal wiring PAD diffuses and thus the material of the lead wiring LE and the material of the signal wiring PAD are mixed with each other.

[0118] The signal wiring PAD and the lead wiring LE may be bonded to each other in the pad melting region and the lead melting region while solidifying. An interface between the signal wiring PAD and the lead wiring LE, ie, an interface between the pad melting region and the lead melting region may have a non-flat shape.

[0119] Reference Fig.10 , Fig.11A and Fig. 11B As described above, the signal wiring PAD on the display substrate 101 and the lead wiring LE on the base substrate 301 are provided. The bonding tip 35 may apply a vibration signal having a uniform vibration amplitude along the first direction DR1 to the signal wiring PAD and the lead wiring LE.

[0120] The vibration signal of the horn tip 35 may have a maximum vibration amplitude AMax and a minimum vibration amplitude AMin. The difference between the maximum vibration amplitude AMax and the minimum vibration amplitude AMin of the vibration signal of the horn tip 35 may be less than about 5% of the maximum vibration amplitude Amax or the minimum vibration amplitude Amin.

[0121] In the display device manufacturing apparatus 10 according to the exemplary embodiment, as Fig. 11B As shown in the figure, the second and third welding head grooves TH2 and TH3 are respectively provided on one side and the other side of the first welding head groove TH1 of the welding head body part 33, so that the welding head body part 33 and the welding head tip part 35 can have a uniform vibration amplitude over the entire area along the first direction DR1.

[0122] Furthermore, in the display device manufacturing apparatus 10 according to the exemplary embodiment, as Fig. 11B As shown in , the horn body portion 33 has a uniform thickness h33 along the second direction DR2 , so the horn body portion 33 and the horn tip portion 35 may have a uniform vibration amplitude over the entire area along the first direction DR1 .

[0123] Fig.12 is a perspective view of an apparatus for manufacturing a display device according to another exemplary embodiment, Fig.13 is a side view of a welding head main body portion and a welding head tip portion of an apparatus for manufacturing a display device according to another exemplary embodiment, Fig.14 is a front view of a welding head main body portion and a welding head tip portion of an apparatus for manufacturing a display device according to another exemplary embodiment, Fig.15A and Fig. 15B is a view showing vibration amplitudes of respective regions of an apparatus for manufacturing a display device. Fig.15A shows the vibration amplitude of the horn tip portion 35 of the display device manufacturing apparatus 10 in the first direction DR1 when the horn tip portion 35 does not include the horn grooves GR1 and GR2, Fig. 15B The vibration amplitude of the horn tip portion 35_1 of the display device manufacturing apparatus 10_1 in the first direction DR1 is shown when the horn tip portion 35_1 includes the horn grooves GR1 and GR2.

[0124] Reference Figures 12 to 15B The display device manufacturing apparatus 10_1 according to the present exemplary embodiment and the display device manufacturing apparatus 10_1 according to Figure 1 The display device manufacturing apparatus 10 described above is different in that the horn tip portion 35_1 further includes horn grooves GR1 and GR2.

[0125] More specifically, the welding head end portion 35_1 of the display device manufacturing apparatus 10_1 according to the present exemplary embodiment may include welding head grooves GR1 and GR2. Fig.14 As shown in , the horn tip portion 35_1 may include a long side edge extending along the first direction DR1 and a short side edge extending along the third direction DR3. The horn grooves GR1 and GR2 of the horn tip portion 35_1 may respectively have a shape recessed from the short side edge of the horn tip portion 35_1. The horn grooves GR1 and GR2 of the horn tip portion 35_1 may respectively have a shape recessed from the middle area of ​​the short side edge of the horn tip portion 35_1.

[0126] The horn tip portion 35_1 may include a first surface connected to the horn body portion 33 and a second surface facing the first surface.

[0127] Each of the horn grooves GR1 and GR2 of the horn tip portion 35_1 may have a shape recessed in the second direction DR2 from a second surface of the horn tip portion 35_1 .

[0128] Reference Fig.15A and Fig. 15B , it can be found that the welding head end portion 35_1 of the display device manufacturing apparatus 10_1 includes the welding head grooves GR1 and GR2, so the vibration amplitude of the short side edge region of the welding head end portion 35_1 in which the welding head grooves GR1 and GR2 are arranged or the vibration amplitude of the peripheral region thereof increases. That is, in the display device manufacturing apparatus 10_1 according to the present exemplary embodiment, the welding head end portion 35_1 includes the welding head grooves GR1 and GR2, so it is possible to make the vibration amplitude of each region of the welding head end portion 35_1 in the first direction DR1 uniform.

[0129] like Fig.14As shown in FIG, the horn grooves GR1 and GR2 of the horn tip portion 35_1 may have a first length Lgr1 and a second length Lgr2 in the third direction DR3, respectively. The first length Lgr1 and the second length Lgr2 of the horn grooves GR1 and GR2 may be equal to each other.

[0130] Each of the first length Lgr1 and the second length Lgr2 of the horn grooves GR1 and GR2 in the third direction DR3 may be about 0.1 times to about 0.9 times the thickness h35 of the horn tip portion 35_1 .

[0131] When each of the first length Lgr1 and the second length Lgr2 of the horn grooves GR1 and GR2 is about 0.1 times or more of the thickness h35 of the horn tip portion 35_1, the vibration amplitude of the horn body portion 33 and the horn tip portion 35_1 can be effectively increased. In addition, when each of the first length Lgr1 and the second length Lgr2 of the horn grooves GR1 and GR2 is about 0.9 times or less of the thickness h35 of the horn tip portion 35_1, the vibration amplitude of the short side edge region of the horn body portion 33 and the horn tip portion 35_1 is greater than the vibration amplitude of the peripheral region other than the short side edge region of the horn body portion 33 and the horn tip portion 35_1, and thus uneven vibration amplitude over the entire region of the horn body portion 33 and the horn tip portion 35_1 can be prevented.

[0132] The welding head grooves GR1 and GR2 can be made shorter from the short side edges of the welding head tip portion 35_1 toward the central area of ​​the welding head tip portion 35_1. Fig.14 As shown in FIG. 3 , the lengths of the horn grooves GR1 and GR2 in the third direction DR3 can be reduced from the short side edges of the horn tip portion 35_1 toward the central area of ​​the horn tip portion 35_1. Therefore, the magnitude of the vibration to be amplified can be gradually reduced from the short edge area in which the horn grooves GR1 and GR2 are arranged toward the central area.

[0133] Even in this exemplary embodiment, in the display device manufacturing equipment 10_1, the second welding head groove TH2 and the third welding head groove TH3 are also arranged on one side and the other side of the first welding head groove TH1 of the welding head body part 33, so the welding head body part 33 and the welding head tip part 35_1 can have a uniform vibration amplitude over the entire area along the first direction DR1.

[0134] Furthermore, in the display device manufacturing apparatus 10_1 according to the present exemplary embodiment, as shown in FIG. Fig. 15B As shown in , the horn body portion 33 has a uniform thickness h33 along the second direction DR2 , so the horn body portion 33 and the horn tip portion 35_1 may have a uniform vibration amplitude over the entire area along the first direction DR1 .

[0135] Fig.16 is a front view of a welding head main body portion and a welding head tip portion of a display device manufacturing apparatus according to still another exemplary embodiment.

[0136] Reference Fig.16 The welding head grooves GR1_1 and GR2_1 of the welding head terminal portion 35_2 of the display device manufacturing apparatus according to the present exemplary embodiment are different from those according to Fig.14 The horn grooves GR1 and GR2 of the horn tip portion 35 are different in that the planar shape of each of the horn grooves GR1_1 and GR2_1 is a triangle.

[0137] More specifically, the lengths of the welding head grooves GR1_1 and GR2_1 of the welding head terminal portion 35_2 of the display device manufacturing apparatus according to the present exemplary embodiment may decrease from the short side edge of the welding head terminal portion 35_2 toward the central area of ​​the welding head terminal portion 35_2, and the plane shape of each of the welding head grooves GR1_1 and GR2_1 is a triangle. That is, the lengths of the welding head grooves GR1_1 and GR2_1 in the third direction DR3 may decrease at a constant degree from the short side edge of the welding head terminal portion 35_2 toward the central area of ​​the welding head terminal portion 35_2.

[0138] The welding head end portion 35_2 of the display device manufacturing apparatus includes the welding head grooves GR1_1 and GR2_1, so the vibration amplitude of the short side edge region of the welding head end portion 35_2 in which the welding head grooves GR1_1 and GR2_1 are arranged or the vibration amplitude of the peripheral region thereof increases. That is, in the display device manufacturing apparatus according to the present exemplary embodiment, the welding head end portion 35_2 includes the welding head grooves GR1_1 and GR2_1, so it is possible to make the vibration amplitude of each region of the welding head end portion 35_2 in the first direction DR1 uniform.

[0139] Even in this exemplary embodiment, in the display device manufacturing equipment, the second welding head groove TH2 and the third welding head groove TH3 are also arranged on one side and the other side of the first welding head groove TH1 of the welding head body part 33, so the welding head body part 33 and the welding head tip part 35_2 can have a uniform vibration amplitude over the entire area along the first direction DR1.

[0140] Furthermore, in the display device manufacturing apparatus according to the present exemplary embodiment, the horn body portion 33 has a uniform thickness h33 along the second direction DR2 , so the horn body portion 33 and the horn tip portion 35_2 may have a uniform vibration amplitude over the entire area along the first direction DR1 .

[0141] Fig.17 is a front view of a welding head main body portion and a welding head tip portion of a display device manufacturing apparatus according to still another exemplary embodiment.

[0142] Reference Fig.17 The welding head grooves GR1_2 and GR2_2 of the welding head terminal portion 35_3 of the display device manufacturing apparatus according to the present exemplary embodiment are different from those according to Fig.16 The difference between the horn grooves GR1_1 and GR2_1 of the horn tip portion 35_2 is that the length reduction rate of the horn grooves GR1_2 and GR2_2 in the third direction DR3 may decrease from the short side edge of the horn tip portion 35_3 toward the central area of ​​the horn tip portion 35_3.

[0143] The welding head end portion 35_3 of the display device manufacturing apparatus includes the welding head grooves GR1_2 and GR2_2, so the vibration amplitude of the short side edge region of the welding head end portion 35_3 in which the welding head grooves GR1_2 and GR2_2 are arranged or the vibration amplitude of the peripheral region thereof increases. That is, in the display device manufacturing apparatus according to the present exemplary embodiment, the welding head end portion 35_3 includes the welding head grooves GR1_2 and GR2_2, so it is possible to make the vibration amplitude of each region of the welding head end portion 35_3 in the first direction DR1 uniform.

[0144] Even in this exemplary embodiment, in the display device manufacturing equipment, the second welding head groove TH2 and the third welding head groove TH3 are also arranged on one side and the other side of the first welding head groove TH1 of the welding head body part 33, so the welding head body part 33 and the welding head tip part 35_3 can have a uniform vibration amplitude over the entire area along the first direction DR1.

[0145] Furthermore, in the display device manufacturing apparatus according to the present exemplary embodiment, the horn body portion 33 has a uniform thickness h33 along the second direction DR2, so the horn body portion 33 and the horn tip portion 35_3 may have a uniform vibration amplitude over the entire area along the first direction DR1.

[0146] Fig.18 is a front view of a welding head main body portion and a welding head tip portion of a display device manufacturing apparatus according to still another exemplary embodiment.

[0147] Reference Fig.18 The welding head tip portion 35_4 of the display device manufacturing apparatus according to the present exemplary embodiment is different from the welding head tip portion 35 of the aforementioned display device manufacturing apparatus according to the exemplary embodiment in that a plurality of welding head grooves GR1 and a plurality of welding head grooves GR2 are provided.

[0148] More specifically, the horn grooves GR1 and GR2 of the horn tip portion 35_4 of the display device manufacturing apparatus according to the present exemplary embodiment may be arranged to be spaced apart from each other in the third direction DR3 .

[0149] Although in Fig.18, two horn grooves GR1 and two horn grooves GR2 are shown to be arranged recessed from the short side edge of the horn tip portion 35_4, but the inventive concept is not limited thereto, and three or more horn grooves GR1 and three or more horn grooves GR2 may be recessed from the short side edge.

[0150] The welding head end portion 35_4 of the display device manufacturing apparatus includes the welding head grooves GR1 and GR2, so the vibration amplitude of the short side edge region of the welding head end portion 35_4 in which the welding head grooves GR1 and GR2 are arranged or the vibration amplitude of the peripheral region thereof increases. That is, in the display device manufacturing apparatus according to the present exemplary embodiment, the welding head end portion 35_4 includes the welding head grooves GR1 and GR2, so it is possible to make the vibration amplitude of each region of the welding head end portion 35_4 in the first direction DR1 uniform.

[0151] Even in this exemplary embodiment, in the display device manufacturing equipment, the second welding head groove TH2 and the third welding head groove TH3 are also arranged on one side and the other side of the first welding head groove TH1 of the welding head main body part 33, so the welding head main body part 33 and the welding head terminal part 35_4 can have a uniform vibration amplitude over the entire area along the first direction DR1.

[0152] Furthermore, in the display device manufacturing apparatus according to the present exemplary embodiment, the horn body portion 33 has a uniform thickness h33 along the second direction DR2, so the horn body portion 33 and the horn tip portion 35_4 may have a uniform vibration amplitude over the entire area along the first direction DR1.

[0153] Fig.19 is a perspective view of a display device manufacturing apparatus according to still another exemplary embodiment, Fig. 20 is a side view of a welding head main body portion and a welding head tip portion of a display device manufacturing apparatus according to still another exemplary embodiment, Fig.21 is a perspective view showing bonding of bonding objects by a display device manufacturing apparatus according to still another exemplary embodiment, Fig.22A and Fig. 22B is a side view illustrating bonding of bonding objects by a display device manufacturing apparatus according to still another exemplary embodiment.

[0154] Reference Figures 19 to 22B The shape of the welding head terminal portion 35_5 of the display device manufacturing apparatus 10_2 according to the present exemplary embodiment is different from that according to Figure 1 The shape of the bonding head tip portion 35 of the display device manufacturing apparatus 10 is different.

[0155] More specifically, in the welding head tip portion 35_5 of the display device manufacturing apparatus 10_2 according to the present exemplary embodiment, the lower surface of the welding head tip portion 35_5 contacting the bonding target object may have a curved shape having a predetermined curvature CRV. As described above, the bonding object may include a signal wiring PAD disposed on the display substrate 101 and a lead wiring LE disposed on the base substrate 301.

[0156] Furthermore, in the horn tip portion 35_5 of the display device manufacturing apparatus 10_2 according to the present exemplary embodiment, the lower surface of the horn tip portion 35_5 may have a hemispherical shape having a curvature a. That is, the lower surface of the horn tip portion 35_5 may have a predetermined curvature a.

[0157] like Fig.22A As shown in FIG. 1 , the display device manufacturing apparatus 10_2 may extend in a direction perpendicular to the bonding direction of the bonding objects, but as shown in FIG. Fig. 22B As shown in , the display device manufacturing apparatus 10_2 may not extend in a direction perpendicular to the bonding direction of the bonding object, but may be inclined in a downward direction (eg, in the third direction DR3) to form an acute angle with respect to the bonding direction of the bonding object.

[0158] like Fig. 22B As shown in , when the welding head tip portion 35_5 applies a vibration signal and pressure to the bonding object in a state in which the display device manufacturing equipment 10_2 forms an acute angle with respect to the bonding direction of the bonding object, there is a possibility that the base substrate 301 of the flexible printed circuit board and / or the lead wiring LE set on the base substrate 301 that contacts the welding head tip portion 35_5 will be subjected to greater pressure.

[0159] However, as in the present exemplary embodiment, when the welding head terminal portion 35_5 of the display device manufacturing equipment 10_2 has a lower surface that contacts the bonding object and has a predetermined curvature CRV, the base substrate 301 of the flexible printed circuit board and / or the lead wiring LE arranged on the base substrate 301 can contact the welding head terminal portion 35_5, and at the same time, have a larger contact area at the portion where the base substrate 301 of the flexible printed circuit board and / or the lead wiring LE arranged on the base substrate 301 contact with the welding head terminal portion 35_5, thereby reducing the possibility of wear and / or breakage due to high pressure.

[0160] In addition, when the lower surface of the welding head terminal portion 35_5 has a curved shape with a predetermined curvature a, the contact area between the welding head terminal portion 35_5 and the bonding object can be made constant, which is different from the case where the display device manufacturing equipment 10_2 extends in a direction perpendicular to the bonding direction of the bonding object (such as Fig.22A) or in which the display device manufacturing equipment 10_2 does not extend in a direction perpendicular to the bonding direction of the bonding object but is inclined in a downward direction (for example, in a third direction DR3) to form an acute angle relative to the bonding direction of the bonding object, thereby improving the bonding reliability of the display device.

[0161] Even in this exemplary embodiment, the welding head terminal portion 35_5 of the display device manufacturing apparatus 10_2 includes the welding head grooves GR1 and GR2, so the vibration amplitude of the short side edge region of the welding head terminal portion 35_5 in which the welding head grooves GR1 and GR2 are arranged or the vibration amplitude of the peripheral region thereof increases. That is, in the display device manufacturing apparatus 10_2 according to the present exemplary embodiment, the welding head terminal portion 35_5 includes the welding head grooves GR1 and GR2, so it is possible to make the vibration amplitude of each region of the welding head terminal portion 35_5 in the first direction DR1 uniform.

[0162] In addition, in the display device manufacturing equipment 10_2, the second welding head groove TH2 and the third welding head groove TH3 are arranged on one side and the other side of the first welding head groove TH1 of the welding head body part 33, so the welding head body part 33 and the welding head tip part 35_5 can have a uniform vibration amplitude over the entire area along the first direction DR1.

[0163] Furthermore, in the display device manufacturing apparatus 10_2 according to the present exemplary embodiment, the horn body portion 33 has a uniform thickness h33 along the second direction DR2, so the horn body portion 33 and the horn tip portion 35_5 may have a uniform vibration amplitude over the entire area along the first direction DR1.

[0164] and Figures 19 to 22B In the display device manufacturing equipment, as shown in Figure 1 As shown in , the horn tip portion 35_5 may not be provided with the horn grooves GR1 and GR2. That is, in this case, the display device manufacturing apparatus may include a horn body portion 33 having a plurality of horn grooves and a horn tip portion 35_5 including a lower surface having a curved shape.

[0165] Fig.23 is a perspective view of a welding head main body portion and a welding head tip portion of a display device manufacturing apparatus according to another exemplary embodiment.

[0166] Reference Fig.23 The welding head end portion 35_6 of the display device manufacturing equipment 10_3 according to the present exemplary embodiment is different from the welding head end portion 35_6 of the display device manufacturing equipment 10_3 according to the exemplary embodiment. Fig. 20 The welding head tip portion 35_6 is different from the welding head tip portion 35_5 in that the welding head tip portion 35_6 includes not only a lower surface contacting the bonding object but also an upper surface facing the lower surface, each of which has a curved shape with a predetermined curvature CRV.

[0167] More specifically, the welding head tip portion 35_6 according to the present exemplary embodiment may include not only a lower surface contacting the bonding object, but also an upper surface facing the lower surface, each of the lower surface and the upper surface having a curved shape with a predetermined curvature CRV. The curvature of the upper surface of the welding head tip portion 35_6 may be equal to the curvature of the lower surface of the welding head tip portion 35_6, but the inventive concept is not limited thereto.

[0168] As in the present exemplary embodiment, when the welding head tip portion 35_6 includes not only a lower surface having a curved shape but also an upper surface having a curved shape, when the lower surface of the welding head tip portion 35_6 is worn due to use, the upper surface of the welding head tip portion 35_6 can be used to apply a vibration signal and pressure to the bonding object by vertically switching the welding head tip portion 35_6 along the third direction DR3.

[0169] As described above, according to exemplary embodiments of the inventive concept, an apparatus for manufacturing a display device which applies vibration of the same magnitude to a joint portion of the display device for each region may be provided.

[0170] Although certain exemplary embodiments and implementations have been described herein, other embodiments and modifications will be apparent from this description. Therefore, the inventive concept is not limited to such embodiments, but is limited to the broader scope of the appended claims and various obvious modifications and equivalent arrangements that will be apparent to those of ordinary skill in the art.

Claims

1. An apparatus for manufacturing a display device, the apparatus comprising: a body configured to generate ultrasonic vibrations; as well as A horn comprising a horn main body portion and a horn tip portion, wherein the horn main body portion is connected to the main body and is configured to amplify the ultrasonic vibration, and the horn tip portion is connected to the horn main body portion and is configured to apply the ultrasonic vibration to a bonding object. The welding head body part includes at least one body groove, which is surrounded by the welding head body part and completely penetrates the welding head body part from the surface of the welding head body part in the thickness direction. Wherein, the welding head main body has a constant thickness in the thickness direction, and Wherein, the thickness of the entire welding head main body in the thickness direction is smaller than the width of the welding head tail end in the thickness direction.

2. The device according to claim 1, wherein: The at least one main body groove includes a main body through hole, and the main body through hole completely penetrates the welding head main body from the surface of the welding head main body in the thickness direction.

3. The device according to claim 2, wherein: The welding head body portion includes a center line that divides the welding head body portion into equal parts in a first direction, the at least one body groove includes a first body groove arranged on the center line, and the first direction is a direction from the body toward the welding head body portion.

4. The apparatus according to claim 3, wherein: The at least one main body groove further includes a second main body groove and a third main body groove, the second main body groove is arranged at one side of the first main body groove in a second direction intersecting the first direction, the third main body groove is arranged at the other side of the first main body groove in the second direction, and A distance from the first main body groove to the second main body groove is equal to a distance from the first main body groove to the third main body groove.

5. The device according to claim 4, wherein: A length of the first main body groove in the first direction is greater than a length of the second main body groove in the first direction, and is greater than a length of the third main body groove in the first direction.

6. An apparatus for manufacturing a display device, the apparatus comprising: a body configured to generate ultrasonic vibrations; as well as A horn comprising a horn main body portion and a horn tip portion, wherein the horn main body portion is connected to the main body and is configured to amplify the ultrasonic vibration, and the horn tip portion is connected to the horn main body portion and is configured to apply the ultrasonic vibration to a bonding object. The welding head body part includes at least one body groove, and the at least one body groove is surrounded by the welding head body part and completely penetrates the welding head body part from the surface of the welding head body part in the thickness direction. The welding head end portion includes a lower surface facing the bonding object, The lower surface of the welding head end portion has a curved shape, The welding head main body has a constant thickness in the thickness direction, and The thickness of the entire welding head main body in the thickness direction is smaller than the width of the welding head tip portion in the thickness direction.

7. The device according to claim 6, wherein: The curved shape of the lower surface has a predetermined curvature.

8. A method for manufacturing a display device, the method comprising the following steps: placing a target panel including a pad area provided with a plurality of signal wirings and a flexible printed circuit board including a plurality of lead wirings on the pad area of ​​the target panel; as well as An ultrasonic bonding device is placed on the flexible printed circuit board, and a horn tip is placed in contact with the flexible printed circuit board to transmit ultrasonic vibration to the flexible printed circuit board, wherein the ultrasonic bonding device includes a main body and a horn, the main body generates ultrasonic vibration, the horn includes a horn main body connected to the main body and amplifying the ultrasonic vibration, and a horn tip connected to the horn main body and applying the ultrasonic vibration to the bonding object. The welding head body part includes at least one body groove, which is surrounded by the welding head body part and completely penetrates the welding head body part from the surface of the welding head body part in the thickness direction. Wherein, the welding head main body has a constant thickness in the thickness direction, and Wherein, the thickness of the entire welding head main body in the thickness direction is smaller than the width of the welding head tail end in the thickness direction.

9. The method according to claim 8, wherein: The step of placing the target panel and the flexible printed circuit board includes placing the signal wiring and the lead wiring corresponding to each other in a thickness direction to directly contact each other, and The step of transmitting the ultrasonic vibration includes ultrasonically bonding the signal wiring to the lead wiring.

10. The method according to claim 8, wherein: The plurality of signal wirings are arranged along a first direction, The vibration direction of the ultrasonic vibration transmitted by the ultrasonic combining device is a second direction intersecting the first direction, and The area of ​​the ultrasonic bonding device contacting the flexible printed circuit board has a uniform vibration amplitude along the first direction, and the difference between the maximum value of the vibration amplitude and the minimum value of the vibration amplitude is 5% or less of the maximum value or the minimum value of the vibration amplitude.

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