Pickup, device and method for combining fingerprint sensor with display panel

Abstract

Provided are a pickup, device, and method for attaching a fingerprint sensor to a display panel. The device includes: a pickup for fixing a rear surface of a fingerprint sensing unit and having a first planar surface with a first-first inclination; a stage for fixing a front surface of the display panel and having a second planar surface with a second-first inclination; a distance measuring unit for measuring distances to a plurality of first points on the front surface of the fingerprint sensing unit and distances to a plurality of second points on the rear surface of the display panel; a controller for outputting a control signal for adjusting the inclination of the first planar surface and / or the second planar surface; a tilt adjustment unit for adjusting the inclination of the first planar surface and / or the second planar surface; and a vertical drive unit for moving at least one of the first planar surface and the second planar surface along a first direction to attach the fingerprint sensing unit to the display panel.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0016704, filed on February 13, 2019, which is hereby incorporated by reference for all purposes as if fully set forth herein. Technical Field

[0002] Exemplary embodiments of the present invention generally relate to a bonding apparatus and a bonding method, and more particularly, to an apparatus for bonding a sensor to a display panel and a method for bonding a sensor to a display panel. Background Art

[0003] As interest in display devices has increased and demand for using portable information media has increased, research on display devices has focused on commercialization.

[0004] Recently, display devices have been equipped with fingerprint sensors for identifying a user's fingerprint. The front surface of the fingerprint sensor may be coupled to the rear surface of the display panel of the display device, and the fingerprint sensor can identify the user's fingerprint that comes into contact with the front surface of the display panel, on which an image is displayed. In this case, the parallelism between the rear surface of the display panel and the front surface of the fingerprint sensor can affect the performance of the fingerprint sensor.

[0005] It will be understood that this background to the technology section is intended to provide a useful context for understanding the technology, and that as so disclosed herein, the background to the technology section may include ideas, concepts, or understandings that were not already known or understood as part of the understanding by those skilled in the relevant art before the corresponding effective filing date of the subject matter disclosed herein.

[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 prior art. Summary of the Invention

[0007] The device constructed according to an exemplary embodiment of the invention can improve the parallelism between the rear surface of the display panel and the front surface of the fingerprint sensor.

[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, an apparatus for coupling a fingerprint sensor to a display panel includes: a picker for fixing a rear surface of a fingerprint sensing unit of the fingerprint sensor and including a first planar surface having a 1-1 inclination; a stage for fixing a front surface of the display panel and including a second planar surface having a 2-1 inclination; a first distance measuring unit for measuring first distances to a plurality of first points located on the front surface of the fingerprint sensing unit; a second distance measuring unit for measuring second distances to a plurality of second points located on the rear surface of the display panel; and a controller for outputting a control signal, the control signal including at least one of a first control signal and a second control signal, the first control signal being used to adjust the picker based on the first distance and the second distance. The device further comprises a first control signal for adjusting the inclination of the first plane surface of the device from a 1-1 inclination to a 1-2 inclination, and a second control signal for adjusting the inclination of the second plane surface of the platform from a 2-1 inclination to a 2-2 inclination based on the first distance and the second distance; a tilt adjustment unit, comprising at least one of a first tilt adjustment unit and a second tilt adjustment unit, the first tilt adjustment unit being used to adjust the inclination of the first plane surface according to the first control signal, and the second tilt adjustment unit being used to adjust the inclination of the second plane surface based on the second control signal; and a vertical driving unit for moving at least one of the first plane surface and the second plane surface along a first direction so that the front surface of the fingerprint sensing unit and the rear surface of the display panel are combined with each other.

[0010] The apparatus may further include an adhesive injector for applying an adhesive onto at least one of a front surface of the fingerprint sensing unit and a rear surface of the display panel, the adhesive including a curable resin.

[0011] The device may further include: a horizontal driving unit for moving the first planar surface of the picker in a direction perpendicular to the first direction; and a camera unit for imaging the front surface of the fingerprint sensing unit and the rear surface of the display panel, wherein the controller may analyze the image captured by the camera unit to generate a third control signal, and the horizontal driving unit may receive the third control signal and cause the front surface of the fingerprint sensing unit and the sensing area of ​​the display panel to overlap each other in the first direction.

[0012] The first planar surface having the 1-1th inclination and the second planar surface having the 2-1st inclination may be parallel to each other.

[0013] The multiple first points may include point 1-1, point 1-2, point 1-3 and point 1-4, point 1-1, point 1-2, point 1-3 and point 1-4 may correspond to vertices of the first quadrilateral, point 1-1 and point 1-3 may be located on the 1-1 diagonal of the first quadrilateral, point 1-2 and point 1-4 may be located on the 1-2 diagonal of the first quadrilateral, the multiple second points may include point 2-1, point 2-2, point 2-3 and point 2-4, point 2-1, point 2-2, point 2-3 and point 2-4 may correspond to vertices of the second quadrilateral, point 2-1 and point 2-3 may be located on the 2-1 diagonal of the second quadrilateral , the 2-2nd point and the 2-4th point may be located on the 2-2nd diagonal of the second quadrilateral, and the controller may determine at least one of the 1-2nd inclination and the 2-2nd inclination based on the 1-1st distance, the 1-2nd distance, the 1-3rd distance, and the 1-4th distance to the 1-1st point, the 1-2nd point, the 1-3rd distance, and the 1-4th distance to the 2-1st point, the 2-2nd distance, the 2-3rd distance, and the 2-4th distance to the 2-1st point, the 2-2nd point, the 2-2nd point, and the 2-3rd distance, and the 2-4th distance, respectively, and at least one of the 1-2nd inclination and the 2-2nd inclination makes the 1-1st diagonal, the 1-2nd diagonal, the 2-1st diagonal, and the 2-2nd diagonal parallel to a plane.

[0014] Point 1-1, point 1-2, point 1-3 and point 1-4 may overlap with point 2-1, point 2-2, point 2-3 and point 2-4 in a first direction, respectively, wherein the controller may determine a first gap between point 1-1 and point 2-1, a second gap between point 1-2 and point 2-2, a third gap between point 1-3 and point 2-3, and a fourth gap between point 1-4 and point 2-4 based on the 1-1 distance, 1-2 distance, 1-3 distance and 1-4 distance to point 1-1, point 1-2, point 1-3 and point 1-4, respectively, and the 2-1 distance, 2-2 distance, 2-3 distance and 2-4 distance to point 2-1, point 2-2, point 2-3 and point 2-4, respectively.

[0015] The controller may determine at least one of the 1-2 inclination and the 2-2 inclination based on the differences between the first gap, the second gap, the third gap, and the fourth gap, wherein the at least one of the 1-2 inclination and the 2-2 inclination makes the first gap and the third gap substantially equal to each other and makes the second gap and the fourth gap substantially equal to each other.

[0016] The controller may determine the inclination of a first plane defining the flatness of the front surface of the fingerprint sensing unit based on the first distance, may determine the inclination of a second plane defining the flatness of the rear surface of the display panel based on the second distance, and may determine at least one of a 1-2 inclination and a 2-2 inclination based on the inclination of the first plane and the inclination of the second plane, wherein the at least one of the 1-2 inclination and the 2-2 inclination makes the first planar surface and the second planar surface parallel to each other.

[0017] The first plane defining the flatness of the front surface of the fingerprint sensing unit may include a 1-1 plane and a 1-2 plane, the 1-1 plane and the 1-2 plane having a minimum spacing distance between them among the two parallel planes of the first group, and the multiple first points of the front surface of the fingerprint sensing unit are located on the 1-1 plane and the 1-2 plane, and the second plane defining the flatness of the rear surface of the display panel may include a 2-1 plane and a 2-2 plane, the 2-1 plane and the 2-2 plane having a minimum spacing distance between them among the two parallel planes of the second group, and the multiple second points of the rear surface of the display panel are located on the 2-1 plane and the 2-2 plane.

[0018] The controller can determine a moving distance of at least one of the first planar surface and the second planar surface in the first direction based on the first distance, the second distance, and a predetermined distance between the rear surface of the display panel and the front surface of the fingerprint sensing unit after combination, and the vertical driving unit can move at least one of the first planar surface and the second planar surface by the moving distance.

[0019] According to another exemplary embodiment, an apparatus for coupling a fingerprint sensor to a display panel includes: a picker for fixing a rear surface of a fingerprint sensing unit of the fingerprint sensor and including a first planar surface having a first-first inclination; a stage for fixing a front surface of the display panel and including a second planar surface having a second-first inclination; a first distance measuring unit for measuring first distances to a plurality of first points located on the front surface of the fingerprint sensing unit; and a controller for outputting a control signal, the control signal including at least one of a first control signal and a second control signal, the first control signal being used to change the inclination of the first planar surface of the picker from the first-first inclination to the second-first inclination based on the first distance. The tilt is adjusted to a 1-2th tilt, and the second control signal is used to adjust the tilt of the second planar surface of the platform from a 2-1st tilt to a 2-2nd tilt based on the first distance; a tilt adjustment unit includes at least one of a first tilt adjustment unit and a second tilt adjustment unit, the first tilt adjustment unit is used to adjust the tilt of the first planar surface according to the first control signal, and the second tilt adjustment unit is used to adjust the tilt of the second planar surface according to the second control signal; and a vertical driving unit is used to move at least one of the first planar surface and the second planar surface along the first direction so that the front surface of the fingerprint sensing unit and the rear surface of the display panel are combined with each other.

[0020] The controller may determine at least one of a 1-2nd inclination and a 2-2nd inclination that substantially minimizes parallelism of the front surface of the fingerprint sensing unit with respect to the second planar surface.

[0021] The controller may determine an inclination of a first plane defining the flatness of a front surface of the fingerprint sensing unit based on a first distance, and may determine at least one of a 1-2 inclination and a 2-2 inclination based on the inclination of the first plane and a 2-1 inclination of the second plane surface, wherein at least one of the 1-2 inclination and the 2-2 inclination makes the first plane surface and the second plane surface parallel to each other.

[0022] According to another exemplary embodiment, an apparatus for coupling a first component to a second component includes: a picker for fixing a rear surface of the first component and including a first planar surface having a 1-1 inclination; a stage for fixing a front surface of the second component and including a second planar surface having a 2-1 inclination; a first distance measuring unit for measuring a first distance to a plurality of first points located on the front surface of the first component; a second distance measuring unit for measuring a second distance to a plurality of second points located on the rear surface of the second component; and a controller for outputting a control signal, the control signal including at least one of a first control signal and a second control signal, the first control signal being used to adjust the first distance of the picker to a predetermined distance based on the first distance and the second distance. The inclination of a planar surface is adjusted from a 1-1 inclination to a 1-2 inclination, and the second control signal is used to adjust the inclination of the second planar surface of the platform from a 2-1 inclination to a 2-2 inclination based on the first distance and the second distance; an inclination adjustment unit, including at least one of a first inclination adjustment unit and a second inclination adjustment unit, the first inclination adjustment unit adjusts the inclination of the first planar surface based on the first control signal, and the second inclination adjustment unit adjusts the inclination of the second planar surface based on the second control signal; and a vertical driving unit for moving at least one of the first planar surface and the second planar surface along a first direction so that the front surface of the first component and the rear surface of the second component are combined with each other.

[0023] According to another exemplary embodiment, a pickup for attaching a fingerprint sensor to a display panel includes a fingerprint sensing unit and a flexible printed circuit board (FPCB). The fingerprint sensing unit has a front surface to be attached to the display panel and a rear surface opposite the front surface. The FPCB is attached to the rear surface of the fingerprint sensing unit. The pickup includes a head for supporting the fingerprint sensor. The head includes a first surface that contacts the rear surface of the fingerprint sensing unit; a second surface that contacts the FPCB; and a third surface that overlaps the fingerprint sensing unit and the FPCB in plan view and defines a groove relative to the first and second surfaces.

[0024] The second surface may not overlap the fingerprint sensing unit in a plan view, the third surface may be spaced apart from the fingerprint sensing unit and the flexible printed circuit board, and the second surface may be disposed between the first surface and the third surface in a direction perpendicular to the first surface and the second surface.

[0025] A step difference between the first surface and the second surface may be substantially equal to or smaller than a thickness of the flexible printed circuit board.

[0026] The second surface may include a material substantially the same as a material forming the first surface or a material having elasticity.

[0027] According to an exemplary embodiment, a method for combining a fingerprint sensor with a display panel includes the following steps: fixing a rear surface of a fingerprint sensing unit of the fingerprint sensor to a first planar surface of a picker, the first planar surface having a first-1 inclination; fixing a front surface of the display panel to a second planar surface of a stage, the second planar surface having a second-1 inclination; measuring first distances to a plurality of first points located on the front surface of the fingerprint sensing unit by a first distance measuring unit; measuring second distances to a plurality of second points located on the rear surface of the display panel by a second distance measuring unit; outputting a control signal by a controller, the control signal including at least one of a first control signal and a second control signal, the first control signal The control signal is used to adjust the inclination of the first planar surface of the pickup from the 1-1 inclination to the 1-2 inclination based on the first distance and the second distance, and the second control signal is used to adjust the inclination of the second planar surface of the stage from the 2-1 inclination to the 2-2 inclination based on the first distance and the second distance; the inclination of the first planar surface is adjusted by the first inclination adjustment unit according to the first control signal, and the inclination of the second planar surface is adjusted by the second inclination adjustment unit based on the second control signal; and at least one of the first planar surface and the second planar surface is moved along the first direction by the vertical driving unit so that the front surface of the fingerprint sensing unit and the rear surface of the display panel are combined with each other.

[0028] The step of outputting a control signal may include: determining the inclination of a first plane based on a first distance, the first plane defining the flatness of the front surface of the fingerprint sensing unit; and determining the inclination of a second plane based on a second distance, the second plane defining the flatness of the rear surface of the display panel, and the step may also include: determining at least one of a 1-2 inclination and a 2-2 inclination based on the inclination of the first plane and the inclination of the second plane, the at least one of the 1-2 inclination and the 2-2 inclination making the first plane surface and the second plane surface parallel to each other.

[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 plan view illustrating a display panel according to an exemplary embodiment.

[0032] Figure 2is a plan view illustrating a display device according to an exemplary embodiment.

[0033] Figure 3 It is along Figure 2 A cross-sectional view taken along line II'.

[0034] Figure 4 is a perspective view illustrating a fingerprint sensor according to an exemplary embodiment.

[0035] Figure 5 is an exploded perspective view of a fingerprint sensing unit according to an exemplary embodiment.

[0036] Figure 6 is a block diagram of a bonding apparatus according to an exemplary embodiment.

[0037] Figure 7 is a perspective view of a second tilt adjusting unit and a stage according to an exemplary embodiment.

[0038] Figure 8 is a perspective view of a second inclination adjusting unit according to another exemplary embodiment.

[0039] Figure 9 is a perspective view of a pickup according to an exemplary embodiment.

[0040] Figure 10A and Figure 10B are a plan view and a cross-sectional view of a fingerprint sensor and a pickup coupled to each other according to an exemplary embodiment.

[0041] Figure 11 are views illustrating vertical and horizontal movements of a coupling device according to an exemplary embodiment.

[0042] Figure 12 is a view illustrating a plurality of distance measurement points according to an exemplary embodiment.

[0043] Figure 13 is a view illustrating a plurality of distance measurement points according to another exemplary embodiment.

[0044] Figure 14 is a view illustrating a method of measuring a distance to a suction surface of a pickup according to an exemplary embodiment.

[0045] Figure 15 is a view illustrating a method of measuring a distance to an adsorption surface of a stage according to an exemplary embodiment.

[0046] Figure 16 is a view illustrating a method of measuring a distance to a front surface of a fingerprint sensing unit (in which the fingerprint sensing unit is adsorbed to an adsorption surface of a pickup) according to an exemplary embodiment.

[0047] Figure 17 is a view illustrating a method of measuring a distance to a rear surface of a display panel (in which the display panel is adsorbed to an adsorption surface of a stage) according to an exemplary embodiment.

[0048] Figure 18 is a view illustrating a method of measuring a distance to a front surface of a fingerprint sensing unit (where the fingerprint sensing unit is adsorbed to an adsorption surface of a pickup) and a distance to a rear surface of a display panel (where the display panel is adsorbed to an adsorption surface of a stage) according to an exemplary embodiment.

[0049] Figure 19 is a view illustrating a method of measuring a distance to a front surface of a fingerprint sensing unit (where the fingerprint sensing unit is adsorbed to an adsorption surface of a pickup) and a distance to a rear surface of a display panel (where the display panel is adsorbed to an adsorption surface of a stage) according to another exemplary embodiment.

[0050] Figure 20 、 Figure 21 and Figure 22 is a view illustrating a method of measuring a distance to a front surface of a fingerprint sensing unit (in which the fingerprint sensing unit is adsorbed to an adsorption surface of a pickup) according to an exemplary embodiment.

[0051] Figure 23 and Figure 24 is a view illustrating a gap deviation between a front surface of a fingerprint sensing unit and a rear surface of a display panel measured according to an exemplary embodiment.

[0052] Figure 25 is a view illustrating parallelism according to an exemplary embodiment.

[0053] Figure 26 and Figure 27 is a view illustrating flatness or parallelism according to an exemplary embodiment.

[0054] Figure 28 and Figure 29 is a view illustrating a front surface of a fingerprint sensing unit and a rear surface of a display panel measured according to an exemplary embodiment.

[0055] Figure 30 and Figure 31 is a view illustrating a front surface of a fingerprint sensing unit and a rear surface of a display panel after tilt adjustment according to an exemplary embodiment.

[0056] Figure 32 、 Figure 33 、 Figure 34 and Figure 35 is a view illustrating a method of adjusting the inclination of a suction surface of a stage and / or a pickup according to an exemplary embodiment.

[0057] Figure 36 are views illustrating a method of aligning a stage and a pickup in a vertical direction after tilt adjustment and a method of checking a distance between a front surface of a fingerprint sensing unit and a rear surface of a display panel according to exemplary embodiments.

[0058] Figure 37 is a view illustrating a method of applying an adhesive over a rear surface of a display panel according to an exemplary embodiment.

[0059] Figure 38 is a view illustrating a method of combining a front surface of a fingerprint sensing unit and a rear surface of a display panel according to an exemplary embodiment.

[0060] Figure 39 is a flowchart illustrating a method of combining a front surface of a fingerprint sensing unit and a rear surface of a display panel according to an exemplary embodiment.

[0061] Figure 40 is a flowchart illustrating a method of aligning an inclination of an adsorption surface of a stage and an inclination of an adsorption surface of a pickup according to an exemplary embodiment.

[0062] Figure 41 is a flowchart illustrating a method of aligning a suction surface of a stage and a suction surface of a pickup in a vertical direction according to an exemplary embodiment.

[0063] Figure 42 is a flowchart illustrating a method of adjusting the inclination of the suction surface of the stage and the inclination of the suction surface of the pickup according to an exemplary embodiment.

[0064] Figure 43 is a flowchart illustrating a method of adjusting an inclination of an adsorption surface of a stage and / or an inclination of an adsorption surface of a pickup according to an exemplary embodiment.

[0065] Figure 44 is a flowchart illustrating a method of adjusting an inclination of an adsorption surface of a stage and / or an inclination of an adsorption surface of a pickup according to another exemplary embodiment.

[0066] Figure 45 is a flowchart illustrating a method of adjusting an inclination of an adsorption surface of a stage and / or an inclination of an adsorption surface of a pickup according to another exemplary embodiment. DETAILED DESCRIPTION

[0067] In the following description, for the purpose of explanation, many specific details are set forth to provide a thorough understanding of the various exemplary embodiments or implementations of the invention. "Embodiment" and "implementation" as used herein are interchangeable words as non-limiting examples of devices or methods employing one or more inventive concepts disclosed herein. However, it is apparent that the various exemplary embodiments can be implemented without these specific details or implemented with one or more equivalent arrangements. In other cases, known structures and devices are shown in block diagram form to avoid making the various exemplary embodiments unnecessarily vague. In addition, the various exemplary embodiments can be different, but do not have to be exclusive. For example, without departing from the inventive concept, the specific shape, construction and characteristics of the exemplary embodiment can be used or implemented in another exemplary embodiment.

[0068] Unless otherwise specified, the exemplary embodiments shown will be understood as providing exemplary features of varying details of some of the ways in which the inventive concept can be implemented 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.

[0069] Cross hatching and / or shading are typically used in the accompanying drawings to make the boundaries between adjacent elements clear. Thus, unless otherwise specified, the presence or absence of cross hatching or shading does not express or indicate any preference or requirement for the specific material, material properties, size, ratio, commonality between the illustrated elements, and / or any other characteristics, attributes, properties, etc. of the elements. In addition, in the accompanying drawings, the size and relative size of the elements may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than described. For example, two continuously described processes may be performed substantially simultaneously or in an order opposite to the described order. In addition, the same reference numerals represent the same elements.

[0070] When an element or layer is referred to as being "on" another element or layer, "connected to" or "bound to" another element or layer, the element or layer may be directly on, directly connected to or directly bound to the other element or layer, or there may be an intermediate element or intermediate layer. However, when an element or layer is referred to as being "directly on" another element or layer, "directly connected to" or "directly bound to" another element or layer, there are no intermediate elements or intermediate layers. For this reason, the term "connected" may refer to a physical connection, an electrical connection and / or a fluid connection with or without an intermediate element. In addition, the X-axis, Y-axis and Z-axis are not limited to the three axes of a rectangular coordinate system such as an x-axis, a y-axis and a z-axis, and may be interpreted in a broader sense. For example, the X-axis, Y-axis and Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purposes 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 understood as X only, Y only, Z only, 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.

[0071] Although the terms "first," "second," etc. may be used herein 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. Thus, a first element discussed below could be named a second element without departing from the teachings of the disclosure.

[0072] For descriptive purposes, spatially relative terms such as "under," "beneath," "beneath," "down," "over," "up," "above," "higher," "side" (e.g., as in "sidewall"), etc., may be used herein 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 drawings is turned over, an element described as "under" or "beneath" other elements or features would subsequently be positioned as "over" the other elements or features. Thus, the exemplary term "under" can include both above and below orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or at other orientations), and as such, the spatially relative descriptors used herein should be interpreted accordingly.

[0073] The terms used herein are for the purpose of describing specific embodiments and are not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms "one", "a (kind / person)" and "the (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, the descriptions indicate the presence of stated features, integral bodies, steps, operations, elements, components and / or their groups, but do not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or their groups. It should also be noted that, as used herein, the terms "substantially", "approximately" and other similar terms are used as approximate terms rather than as degree terms, and so they are used to explain the inherent deviations in the measured values, calculated values ​​and / or provided values ​​that will be recognized by those of ordinary skill in the art.

[0074] Various exemplary embodiments are described herein with reference to cross-sectional and / or exploded views that are schematic representations of idealized exemplary embodiments and / or intermediate structures. As such, variations in the illustrated shapes due to, for example, manufacturing techniques and / or tolerances are anticipated. Therefore, the exemplary embodiments disclosed herein should not necessarily be construed as limited to the specific illustrated shapes of the regions, but rather are intended to include deviations in shape due to, for example, manufacturing. In this manner, the regions illustrated in the accompanying 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 limiting.

[0075] As is customary in the art, some exemplary embodiments are described and illustrated in the accompanying drawings using functional blocks, units, and / or modules. It will be understood by those skilled in the art that these functional blocks, units, and / or modules are physically implemented by electronic (or optical) circuits, discrete components, microprocessors, hard-wired circuits, memory elements, wiring connections, and the like, such as logic circuits, which can be formed using semiconductor-based manufacturing techniques or other manufacturing techniques. Where functional blocks, units, and / or modules are implemented by microprocessors or other similar hardware, they can be programmed and controlled using software (e.g., microcode) to perform the various functions discussed herein, and can optionally be driven by firmware and / or software. It is also contemplated that each functional block, unit, and / or module can be implemented by dedicated hardware, or as a combination of dedicated hardware that performs some functions and a processor (e.g., one or more programmed microprocessors and associated circuitry) that performs other functions. In addition, without departing from the scope of the inventive concept, each functional block, unit, and / or module of some exemplary embodiments can be physically separated into two or more interactive and discrete functional blocks, units, and / or modules. Furthermore, the functional blocks, units and / or modules of some exemplary embodiments may be physically combined into more complex functional blocks, units and / or modules without departing from the scope of the inventive concept.

[0076] Unless otherwise defined, all terms used herein (including technical and scientific terms) 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 common 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 expressly defined as such herein.

[0077] As used herein, the display device will be described as an organic light emitting diode (OLED) display device. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the display device may be a liquid crystal display (LCD) device or a plasma display device.

[0078] In the following, reference will be made to Figures 1 to 45 Exemplary embodiments of the present invention are described.

[0079] Figure 1 is a plan view showing a display panel 100 according to an exemplary embodiment, Figure 2 is a plan view showing a display device according to an exemplary embodiment, Figure 3 It is along Figure 2 A cross-sectional view taken along line II' of Figure 4 is a perspective view of a fingerprint sensor 200 according to an exemplary embodiment.

[0080] Reference Figures 1 to 4 According to an exemplary embodiment, a display device includes a display panel 100 and a fingerprint sensor 200 provided at a rear surface 111 of the display panel 100. The display panel 100 may include a substrate 110, a display unit 120, a window 130, a first flexible printed circuit board 150, and a composite sheet 140. The fingerprint sensor 200 may include a fingerprint sensing unit 210 and a second flexible printed circuit board 220.

[0081] The display panel 100 can display, for example, arbitrary time information, text, video, photos, two-dimensional or three-dimensional images, etc. on its front surface. The type of the display panel 100 is not particularly limited as long as the display panel 100 can display images. In an exemplary embodiment, the display panel 100 can be an OLED panel. However, the inventive concept is not limited to a specific type of display panel 100, and in some exemplary embodiments, the display panel 100 can include other types of display panels.

[0082] The display panel 100 can be provided in various shapes, for example, a quadrilateral plate having two pairs of parallel sides. When the display panel 100 has a substantially quadrilateral plate shape, any one of the two pairs of sides may be longer than the other pair. Hereinafter, according to exemplary embodiments, the display panel 100 will be described as having a substantially quadrilateral shape having a pair of long sides and a pair of short sides.

[0083] However, the inventive concept is not limited to a display panel 100 having a specific shape, but may have various shapes. For example, in some exemplary embodiments, the display panel 100 may have the following shapes: a closed polygonal shape including straight sides; a circular shape, an elliptical shape, etc. including curved sides; a semicircular shape, a semi-elliptical shape, etc. including straight sides and curved sides.

[0084] The display panel 100 may be fully or at least partially flexible. For example, the display panel 100 may be flexible throughout the entire area, or may be flexible in an area corresponding to a flexible area.

[0085] The display panel 100 can display an image toward the front surface. The display panel 100 includes a display area and a non-display area. The display area is provided with a display unit 120 for displaying an image, and the non-display area is located on at least one side of the display area. For example, the non-display area can surround the display area.

[0086] The display panel 100 includes a sensing area 142 for sensing fingerprints. The sensing area 142 corresponds to an area overlapping with the fingerprint sensing unit 210 in a plan view and has a shape substantially the same as that of the fingerprint sensing unit 210. The sensing area 142 may overlap with part or all of the display area. For example, the sensing area 142 may be surrounded by the display area.

[0087] The window 130 is provided on one side of the front surface of the display panel 100. The window 130 may have a plate shape corresponding to the shape of the display panel 100 and cover at least a portion of the front surface of the display panel 100. For example, when the display panel 100 has a quadrilateral shape, the window 130 may also have a corresponding quadrilateral shape. Alternatively, when the display panel 100 has a circular shape, the window 130 may also have a corresponding circular shape. The front surface of the window 130 may correspond to the front surface of the display panel 100.

[0088] The window 130 transmits an image from the display panel 100 and mitigates external impact, thereby substantially preventing the display panel 100 from being broken or malfunctioning due to the external impact.

[0089] The window 130 may be fully or at least partially flexible. For example, the window 130 may be flexible throughout the entire area, or may be flexible in an area corresponding to the flexible area.

[0090] More specifically, the display device includes a substrate 110 , a display unit 120 disposed on a front surface 112 of the substrate 110 , and a fingerprint sensor 200 disposed on a rear surface 111 of the substrate 110 .

[0091] For example, the substrate 110 may include an insulating material such as quartz, synthetic quartz, calcium fluoride, F-doped quartz, soda-lime glass, non-alkali glass, and resin. In addition, the substrate 110 may include a flexible material to be bent or folded, and may have a single-layer structure or a multi-layer structure.

[0092] For example, the substrate 110 may include a material selected from the group consisting of polystyrene, polyvinyl alcohol, polymethyl methacrylate, polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, cellulose triacetate, and cellulose acetate propionate.

[0093] However, the inventive concept is not limited to the above materials, and for example, in some exemplary embodiments, the substrate 110 may include, for example, glass fiber reinforced plastic.

[0094] In an exemplary embodiment, the substrate 110 may be a polyimide substrate. The polyimide substrate may include, for example, a first polyimide layer, a barrier film layer, and a second polyimide layer. When the polyimide substrate is formed to be thin and flexible, the polyimide substrate may be formed on a rigid carrier substrate to support the formation of a light-emitting structure. More specifically, the substrate 110 according to an exemplary embodiment may have a structure in which a first polyimide layer, a barrier film layer, and a second polyimide layer are stacked on a carrier substrate. For example, after an insulating layer is provided on the second polyimide layer, a thin film transistor and a light-emitting element may be formed on the insulating layer. After forming such a light-emitting structure, the carrier substrate may be removed. Because the polyimide substrate is thin and flexible, it may be difficult to directly form a light-emitting structure on the polyimide substrate. In this way, a rigid carrier substrate may be utilized to form the light-emitting structure, and then the carrier substrate may be removed so that the polyimide substrate can be used as the substrate 110.

[0095] The substrate 110 may have a plate shape having a front surface 112 and a rear surface 111 opposite to the front surface 112. The rear surface 111 of the substrate 110 may correspond to the rear surface 111 of the display panel 100.

[0096] The display unit 120 may be disposed on the front surface 112 of the substrate 110. In an exemplary embodiment, the display unit 120 may overlap a portion or the entirety of the sensing area 142.

[0097] The display unit 120 displays an image input by a user or information provided to the user. The display unit 120 may include a plurality of pixels arranged on the front surface 112 of the substrate 110 and at least one wire electrically connected to the pixels. The substrate 110 may include a flexible material so that at least a portion thereof (e.g., the bent portion 110-1) can be bent in a backward direction. The wire may include at least one gate line and / or at least one data line. In an exemplary embodiment, a plurality of gate lines and a plurality of data lines may be arranged in a matrix, and a plurality of pixels may be aligned adjacent to a point where the lines intersect each other and electrically connected to a point where the lines intersect each other.

[0098] The first flexible printed circuit board 150 may include a wiring structure that electrically connects the main circuit board to the display panel 100. According to an exemplary embodiment, the first flexible printed circuit board 150 may be a flexible printed circuit board. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the first flexible printed circuit board 150 may be a rigid printed circuit board. The first flexible printed circuit board 150 may be electrically connected to the main circuit board via a connector 152.

[0099] The first flexible printed circuit board 150 may include a driver integrated circuit (IC) 151, such as a driver IC for providing drive signals and image signals to the display panel 100 or a timing controller (T-CON) for controlling the drive signals and image signals. The driver IC 151 may include a gate driver IC for sequentially selecting gate signal lines of the display panel 100 and applying scan signals (or drive signals) thereto, and a data driver IC (or source driver IC) for applying image signals to the data signal lines of the display panel 100. According to exemplary embodiments, when the gate driver IC selects a gate signal line and applies a scan signal to change the corresponding pixel to an active state, the data driver IC may apply an image signal to the corresponding pixel via the data signal line. The timing controller may control the transmission timing of the signal transmitted to the driver IC 151, thereby substantially preventing a display time difference that may occur during the process of outputting to the display panel 100.

[0100] The composite sheet 140 is attached to the rear surface 111 of the substrate 110 through an adhesive layer. The composite sheet 140 has an opening 141 in the sensing area 142 for exposing the rear surface 111 of the substrate 110. The opening 141 may have a shape substantially the same as that of the sensing area 142 or the fingerprint sensing unit 210. The opening 141 may be larger than the sensing area 142 or the fingerprint sensing unit 210 by a predetermined margin. The composite sheet 140 may include a heat radiation sheet for dissipating heat generated in the display unit 120, a black sheet for blocking light generated in the display unit 120, a pattern film for preventing unevenness of the substrate 110, and a conductive film for preventing damage to the display panel 100 due to static electricity.

[0101] The fingerprint sensor 200 is a sensing element for identifying a user's fingerprint and may be provided on the rear surface 111 of the substrate 110. The fingerprint sensor 200 includes a fingerprint sensing unit 210 having a flat plate shape and a second flexible printed circuit board 220. According to an exemplary embodiment, the fingerprint sensing unit 210 may be provided only in the sensing area 142 of the rear surface 111 of the substrate 110.

[0102] In an exemplary embodiment, the fingerprint sensing unit 210 may have a size and shape suitable for recognizing a user's fingerprint. Hereinafter, the fingerprint sensing unit 210 will be described as having a generally quadrilateral shape. However, the inventive concept is not limited to a fingerprint sensing unit 210 having a specific shape, and in some exemplary embodiments, the fingerprint sensing unit 210 may have a generally circular shape, an elliptical shape, a semicircular shape, or a polygonal shape.

[0103] The fingerprint sensing unit 210 can be connected to the first flexible printed circuit board 150 through the second flexible printed circuit board 220. The second flexible printed circuit board 220 includes a pad portion 221 connected to the fingerprint sensing unit 210 and a connector 222 connected to the first flexible printed circuit board 150. The second flexible printed circuit board 220 may include, for example, separate wiring, a flexible printed circuit board, a tape carrier package, connectors, and a chip on film.

[0104] The fingerprint sensor 200 may be an optical sensor or an ultrasonic sensor. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the fingerprint sensor 200 may include various other types of fingerprint sensors. For example, the fingerprint sensor 200 may be a capacitive type, a thermal sensing type, or a contactless type.

[0105] The adhesive layer (hereinafter, also referred to as an adhesive) 145 bonds the fingerprint sensing unit 210 and the substrate 110 to each other. The adhesive layer 145 may include a curable adhesive. The curable adhesive may include, for example, at least one of an epoxy resin composition, a silicone resin composition, a modified epoxy resin composition (such as a silicone-modified epoxy resin), a modified silicone resin composition (such as an epoxy-modified silicone resin), a polyimide resin composition, a modified polyimide resin composition, polyphthalamide (PPA), a polycarbonate resin, polyphenylene sulfide (PPS), a liquid crystal polymer (LCP), ABS resin, a phenolic resin, an acrylic resin, and a PBT resin.

[0106] Figure 5 is an exploded perspective view of the fingerprint sensing unit 210 according to an exemplary embodiment.

[0107] According to an exemplary embodiment, the fingerprint sensing unit 210 includes an ultrasonic transmitter 215 and an ultrasonic receiver 216 disposed below a planarization layer 239. The front surface 211 of the planarization layer 239 may correspond to the front surface 211 of the fingerprint sensing unit 210. The ultrasonic transmitter 215 may include a piezoelectric transmitter layer 232, which is substantially flat and can function as a plane wave generator. Ultrasonic waves can be generated by applying a voltage to the piezoelectric layer, causing it to expand or contract according to the applied signal, thereby generating a plane wave. The voltage can be applied to the flat piezoelectric transmitter layer 232 via a first transmitter electrode 233 and a second transmitter electrode 231. Ultrasonic waves can be generated by varying the thickness of the layer through the piezoelectric effect. Such ultrasonic waves can travel toward a finger (or another object to be detected) and can pass through the planarization layer 239 and the display panel 100. Portions of the wave not absorbed or transmitted by the object to be detected may be reflected, again passing through the display panel 100 and the planarization layer 239, and received by at least a portion of the ultrasonic receiver 216. The first transmitter electrode 233 and the second transmitter electrode 231 may be metallized electrodes, eg, metal layers coating opposite sides of the piezoelectric transmitter layer 232 .

[0108] The ultrasound receiver 216 may include an array of sensor pixel circuits 235 and a piezoelectric receiver layer 237 disposed on a substrate 234 (also referred to as a backplate). In an exemplary embodiment, each sensor pixel circuit 235 may include one or more additional circuit elements, such as one or more TFT elements, electrical interconnect traces, diodes, and capacitors, for example. Each sensor pixel circuit 235 may be configured to convert charge generated in the piezoelectric receiver layer 237 adjacent to the sensor pixel circuit 235 into an electrical signal. Each sensor pixel circuit 235 may include a pixel input electrode 236 electrically coupling the piezoelectric receiver layer 237 to the sensor pixel circuit 235.

[0109] In an exemplary embodiment, a receiver bias electrode 238 is disposed on one side of the piezoelectric receiver layer 237 adjacent to the planarization layer 239. The receiver bias electrode 238 can be a metallized electrode and can be grounded or biased to control which signals are passed to the array of sensor pixel circuits 235. Ultrasonic energy reflected from the exposed front surface 211 of the planarization layer 239 can be converted into localized charges by the piezoelectric receiver layer 237. These localized charges can be collected by the pixel input electrode 236 and passed to the sensor pixel circuits 235 located therebeneath. The charges can be amplified or buffered by the sensor pixel circuits 235.

[0110] The planarization layer 239 may comprise any suitable material that can be acoustically bonded to the ultrasonic receiver 216, such as plastic, ceramic, sapphire, metal, and glass. In an exemplary embodiment, the planarization layer 239 may correspond to the display panel 100. Specifically, when using the ultrasonic transmitter 215, fingerprint detection and imaging can be performed with a relatively thick planarization layer 239, which may have a thickness of approximately 3 mm and greater. However, for embodiments of the ultrasonic receiver 216 capable of imaging fingerprints in force detection mode or capacitance detection mode, a thinner and relatively more flexible planarization layer 239 may be desirable. In an exemplary embodiment, the planarization layer 239 may comprise one or more polymers (e.g., one or more types of parylene) and may be formed to be substantially thinner. For example, in an exemplary embodiment, the planarization layer 239 may be tens of microns thick or even less than 10 microns thick.

[0111] Piezoelectric materials that can be used to form the piezoelectric receiver layer 237 can include piezoelectric polymers having suitable acoustic properties (such as an acoustic impedance in the range of about 2.5 MRayls to about 5 MRayls). More specifically, the piezoelectric material can include a ferroelectric polymer such as polyvinylidene fluoride (PVDF) and polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) copolymers. Examples of PVDF copolymers can include 60:239 (mol%) PVDF-TrFE, 70:30 PVDF-TrFE, 80:215 PVDF-TrFE, and 90:10 PVDR-TrFE. Other examples of applicable piezoelectric materials can include polyvinylidene chloride (PVDC) homopolymers and copolymers, polytetrafluoroethylene (PTFE) homopolymers and copolymers, and diisopropylammonium bromide (DIPAB).

[0112] The thickness of each of the piezoelectric transmitter layer 232 and the piezoelectric receiver layer 237 can be selected to be suitable for generating and receiving ultrasonic waves. In an exemplary embodiment, the planar PVDF piezoelectric transmitter layer 232 has a thickness of approximately 28 μm, and the PVDF-TrFE piezoelectric receiver layer 237 has a thickness of approximately 12 μm. Exemplary frequencies of ultrasonic waves can range from approximately 5 MHz to approximately 30 MHz, with wavelengths of approximately 1 mm or less.

[0113] Figure 6 is a block diagram of a bonding apparatus 300 according to an exemplary embodiment, Figure 7 is a perspective view of the second inclination adjusting unit 340-1 and the stage 320 according to an exemplary embodiment, Figure 8 is a perspective view of a second inclination adjusting unit 340-2 according to another exemplary embodiment, Figure 9 is a perspective view of a pickup 330 according to an exemplary embodiment, Figure 10A and Figure 10B are a plan view and a cross-sectional view illustrating the fingerprint sensor 200 and the pickup 330 coupled to each other according to an exemplary embodiment, Figure 11 2 are views illustrating vertical and horizontal movements of the coupling device 300 according to an exemplary embodiment.

[0114] Reference Figure 6 and Figure 11 The bonding device 300 according to an exemplary embodiment includes: a picker 330 for picking up the fingerprint sensor 200, transferring the fingerprint sensor 200 toward the display panel 100, and then bonding the fingerprint sensor 200 to the rear surface 111 of the display panel 100 (more specifically, to the rear surface 111 of the substrate 110); and a stage 320 for supporting the display panel 100 when the fingerprint sensor 200 is pressed to the display panel 100 by the picker 330. The picker 330 may include an adsorption surface 335 or a first plane surface 335 to which the rear surface 212 of the fingerprint sensing unit 210 is fixed. The stage 320 may include an adsorption surface 321 or a second plane surface 321 to which the front surface of the display panel 100 is fixed.

[0115] Furthermore, the coupling device 300 according to an exemplary embodiment may include a horizontal drive unit 365 for moving the picker 330 in a horizontal direction (e.g., a direction substantially perpendicular to the direction of gravity, a direction substantially parallel to the XY plane, the X-axis direction, and the Y-axis direction) in response to a control signal from the controller 310, and a vertical drive unit 360 for moving the picker 330 in a vertical direction (e.g., a direction substantially perpendicular to the XY plane and the Z-axis direction) in response to a control signal from the controller 310. Furthermore, the horizontal drive unit 365 may include a drive unit for rotating the suction surface 335 of the picker 330 about a vertical direction (e.g., the Z-axis direction). Furthermore, the coupling device 300 may further include a horizontal drive unit for moving the stage 320 in a horizontal direction (e.g., a direction substantially parallel to the XY plane, the X-axis direction, and the Y-axis direction), and a vertical drive unit for moving the stage 320 in a vertical direction (e.g., a direction substantially perpendicular to the XY plane and the Z-axis direction).

[0116] Furthermore, the coupling device 300 according to an exemplary embodiment may include a camera unit 380 for imaging the adsorption surface 321 of the stage 320 and / or the adsorption surface 335 of the pickup 330. The controller 310 analyzes the image captured by the camera unit 380 to calculate a positional error between the sensing area 142 of the display panel 100 (where the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320) and the fingerprint sensing unit 210. The positional error may include errors in the horizontal directions (e.g., the X-axis and Y-axis directions) and a rotational error about the vertical direction (e.g., the Z-axis direction). The controller 310 controls the horizontal drive unit 365 based on the positional error calculated from the captured image to horizontally move or rotate the adsorption surface 335 of the pickup 330 so that the fingerprint sensing unit 210 is precisely aligned with the sensing area 142 in the vertical direction (e.g., the Z-axis direction).

[0117] Reference Figure 7 and Figure 11 , the picker 330 absorbs the fingerprint sensor 200 from the rail while the display panel 100 is moved to a predetermined working position and waiting at the predetermined working position, and transports the fingerprint sensor 200 to the sensing area 142 of the display panel 100 on which the adhesive 145 is applied. In this state, the picker 330 moves downward and presses the fingerprint sensor 200 to the display panel 100 so that they can be combined with each other. In this case, according to an exemplary embodiment, the stage 320 positioned below the display panel 100 can support the display panel 100.

[0118] The picker 330 includes a head 331 that absorbs and supports the fingerprint sensor 200 during the transfer process or the pressing process of the fingerprint sensor 200. The structure of the head 331 will be described below. The coupling device 300 may include a first tilt adjustment unit 350 that can adjust the tilt of the picker 330 (or more precisely, the tilt of the suction surface 335 of the head 331).

[0119] The stage 320 is in direct contact with the display panel 100, thereby supporting the display panel 100. The second inclination adjusting unit 340 adjusts the horizontality (ie, inclination) of the stage 320 while supporting the stage 320 from below the stage 320.

[0120] The distance measuring unit 390 measures distances to a plurality of points located at the adsorption surface 321 of the stage 320, the adsorption surface 335 of the pickup 330, the front surface 211 of the fingerprint sensing unit 210, and the rear surface 111 of the display panel 100. The distance measuring unit 390 may include a first distance measuring unit 430 and a second distance measuring unit 440. The first distance measuring unit 430 is configured to measure distances from a predetermined reference plane to a plurality of points located at the adsorption surface 335 of the pickup 330 ( Figure 12 and Figure 13 The second distance measuring unit 440 is used to measure the distance from the predetermined reference plane to the plurality of points ( Figure 12 and Figure 13 The distance of 420).

[0121] In an exemplary embodiment, the distance measurement unit 390 includes one or more ultrasonic sensors and measures the distance by utilizing the time it takes for an ultrasonic signal emitted from each ultrasonic sensor to reflect from a point on an arbitrary plane and return. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the distance measurement unit 390 may include, for example, a confocal sensor, an interferometer sensor, a 2D / 3D scanner, and a gap sensor.

[0122] The following will refer to Figures 12 to 22 A method of measuring distances to a plurality of points by using the distance measuring unit 390 is described.

[0123] The first tilt adjustment unit 350 adjusts the tilt of the suction surface 335 of the pickup 330 from the 1-1st tilt to the 1-2nd tilt based on a control signal output from the controller 310 to be described below. The second tilt adjustment unit 340 is provided below the stage 320 and adjusts the tilt of the suction surface 321 of the stage 320 from the 2-1st tilt to the 2-2nd tilt based on a control signal output from the controller 310 to be described below.

[0124] The controller 310 calculates deviations between distances from a reference plane to a plurality of points, and generates a control signal for adjusting the inclination of the first inclination adjustment unit 350 and / or the second inclination adjustment unit 340 based on the calculated deviations.

[0125] The adhesive injector (or referred to as an adhesive injection unit) 370 applies the adhesive 145 onto the rear surface 111 of the display panel 100 and / or the front surface 211 of the fingerprint sensing unit 210 .

[0126] Figure 7 and Figure 8 is a view illustrating the second inclination adjusting unit 340 according to an exemplary embodiment.

[0127] Reference Figure 7 According to the illustrated exemplary embodiment, the second inclination adjustment unit 340 - 1 may include a 2-1st inclination adjustment unit driven by a third motor 343 , a 2-2nd inclination adjustment unit driven by a first motor 341 and a second motor 342 , and an adjustment plate 344 of the support table 320 .

[0128] The first motor 341 and the second motor 342 are located below one side of the adjustment plate 344, and the third motor 343 is located below the other side of the adjustment plate 344. Each of the first motor 341, the second motor 342, and the third motor 343 is connected to through-holes 341b and 342b defined at an edge portion of one side of the adjustment plate 344 and a through-hole 343b defined at a center portion of the other side of the adjustment plate 344 via screw shafts 341a, 342a, and 343a, respectively. Threads may be defined inside the through-holes 341b, 342b, and 343b, and the threads of the screw shafts 341a, 342a, and 343a engage with the threads of the through-holes 341b, 342b, and 343b for operation.

[0129] When the first motor 341 is driven, the adjustment plate 344 moves upward or downward (ascends or descends) depending on the rotation direction of the screw shaft 341a. For example, when the screw shaft 341a rotates clockwise, only the area of ​​the adjustment plate 344 connected to the screw shaft 341a can rise. In this case, the screw shaft 342a connected to the other side of the adjustment plate 344 supports the lifting of the adjustment plate 344. Therefore, when the adjustment plate 344 rotates about the Y-axis, for example, the inclination of the stage 320 provided on the upper surface of the adjustment plate 344 can be adjusted.

[0130] On the other hand, when the second motor 342 is driven, only the area of ​​the adjustment plate 344 through which it is connected to the screw shaft 342a moves up or down, and in this case, the adjustment plate 344 is supported to rotate around the Y axis through the screw shaft 341a on the other side of the adjustment plate 344.

[0131] Furthermore, when the third motor 343 is driven, the adjustment plate 344 moves upward or downward depending on the rotation direction of the screw shaft 343a. For example, when the screw shaft 343a rotates clockwise, only the area of ​​the adjustment plate 344 connected to the screw shaft 343a can be raised. In this case, when the adjustment plate 344 rotates about the X-axis, for example, the inclination of the stage 320 disposed on the upper surface of the adjustment plate 344 can be adjusted.

[0132] Reference Figure 8 , the second inclination adjusting unit 340-2 according to the illustrated exemplary embodiment includes a first plate 346-1 for supporting the table 320, a second plate 346-2 for supporting the first plate 346-1, a third plate 347-1 for supporting the second plate 346-2, and a fourth plate 347-2 for supporting the third plate 347-1.

[0133] The first plate 346 - 1 and the second plate 346 - 2 are joined to each other with curved surfaces relative to the X-axis, and the third plate 347 - 1 and the fourth plate 347 - 2 are joined to each other with curved surfaces relative to the Y-axis.

[0134] The first motor 348 moves the first plate 346-1 relative to the second plate 346-2 in the Y-axis direction, allowing the upper surface of the first plate 346-1 to rotate relative to the second plate 346-2 about the X-axis. The second motor 345 moves the third plate 347-1 relative to the fourth plate 347-2 in the X-axis direction, allowing the upper surface of the third plate 347-1 to rotate relative to the fourth plate 347-2 about the Y-axis.

[0135] Although reference has been Figure 7 and Figure 8 The structure of the second tilt adjustment unit 340 has been described, but the inventive concept is not limited thereto. For example, the second tilt adjustment unit 340 may include tilt adjustment units of various configurations that can rotate the adsorption surface 321 of the stage 320 relative to any direction (e.g., the X-axis direction and the Y-axis direction that are substantially parallel to the XY plane and intersect with each other).

[0136] Figure 9 is a perspective view of a pickup 330 according to an exemplary embodiment, Figure 10A and Figure 10B are a plan view and a cross-sectional view illustrating the fingerprint sensor 200 and the pickup 330 coupled to each other according to an exemplary embodiment.

[0137] Reference Figure 9 , the picker 330 may include a fixing portion 334 , a driving shaft 333 , an extending portion 332 , and a head portion 331 .

[0138] The fixing portion 334 may be fixed to the vertical driving unit 360 and the horizontal driving unit 365. The head portion 331 may be fixed to the vertical driving unit 360 and the horizontal driving unit 365 through the fixing portion 334.

[0139] The extension portion 332 is connected to the fixing portion 334 via the driving shaft 333. The extension portion 332 is rotatably coupled to the driving shaft 333. The extension portion 332 can rotate about the Z axis. In addition, the extension portion 332 can rotate about the X axis and the Y axis under the control of the first inclination adjustment unit 350.

[0140] The head portion 331 is coupled to the extension portion 332. The head portion 331 is located at the end of the pickup 330. The lower surface of the head portion 331 is a suction surface 335 that can directly contact the fingerprint sensor 200.

[0141] Reference Figure 10A and Figure 10B The head 331 includes a first surface 335 (adsorption surface) in contact with the rear surface 212 of the fingerprint sensing unit 210, a third surface 336_1 in contact with the second flexible printed circuit board 220, and a second surface 339_1 overlapping the fingerprint sensing unit 210 and the second flexible printed circuit board 220 in a plan view, and the second surface 339_1 defines a groove 339 relative to the first surface 335 and the third surface 336_1.

[0142] The head 331 includes a first surface 335 (e.g., an adsorption surface) that is a flat surface in direct contact with the fingerprint sensing unit 210. The adsorption surface 335 is adsorbed to the rear surface 212 of the fingerprint sensing unit 210, to which the second flexible printed circuit board 220 is attached. The adsorption surface 335 does not overlap the second flexible printed circuit board 220 in a plan view, but rather contacts only the rear surface 212 of the fingerprint sensing unit 210 exposed by the second flexible printed circuit board 220. The edge of the adsorption surface 335 may be substantially parallel to the exposed edge of the fingerprint sensing unit 210. The edge of the adsorption surface 335 and the edge of the fingerprint sensing unit 210 may be spaced apart from each other by a distance within a predetermined distance D in a plan view. Furthermore, the edge of the adsorption surface 335 and the edge of the second flexible printed circuit board 220 may be spaced apart from each other by a distance within a predetermined distance D in a plan view. For example, the predetermined distance D may be approximately 1 mm, more preferably approximately 0.5 mm.

[0143] The head portion 331 includes a second surface 339_1 defining a groove 339. The groove 339 is recessed relative to the suction surface 335 in a region overlapping the pad portion 221 of the second flexible printed circuit board 220 in plan view. The groove 339 and the second surface 339_1 overlap part or all of the overlapping region between the fingerprint sensing unit 210 and the second flexible printed circuit board 220 in plan view. The second surface 339_1 does not contact the second flexible printed circuit board 220. The step difference between the second surface 339_1 and the suction surface 335 is greater than the thickness of the second flexible printed circuit board 220. The second surface 339_1 and the groove 339 extend along the edge of the suction surface 335 depending on the position of the pad portion 221. Furthermore, the groove 339 can expose a portion of the fingerprint sensing unit 210 adjacent to the second flexible printed circuit board 220.

[0144] The head portion 331 includes a protrusion 336 protruding from the second surface 339_1 in an area that overlaps the second flexible printed circuit board 220 in plan view but does not overlap the pad portion 221 in plan view. A third surface 336-1 of the protrusion 336 may not overlap the fingerprint sensing unit 210 in plan view. Furthermore, the third surface 336-1 is in direct contact with the second flexible printed circuit board 220. The third surface 336-1 in contact with the second flexible printed circuit board 220 may not protrude beyond the suction surface 335. The step difference between the third surface 336-1 and the suction surface 335 may be substantially equal to the thickness of the second flexible printed circuit board 220. Alternatively, the step difference between the third surface 336-1 and the suction surface 335 may be less than the thickness of the second flexible printed circuit board 220. The third surface 336-1 extends along one side of the groove 339 (e.g., the side opposite the suction surface 335).

[0145] In an exemplary embodiment, the protrusion 336 may be integrally formed with the head 331. The protrusion 336 may include a material substantially the same as that included in the head 331. Alternatively, the protrusion 336 may include a material different from that of the head 331. The protrusion 336 may include a metal, such as aluminum. Alternatively, the protrusion 336 may include a resilient cushioning material. The third surface 336-1 may include a metal material substantially the same as that included in the adsorption surface 335. Alternatively, the third surface 336-1 may include a resilient cushioning material.

[0146] The head portion 331 may include at least one suction hole 337. The suction holes 337 may be connected to each other via a connection hole 338 recessed relative to the suction surface 335. The connection hole 338 may be located at the suction surface 335 of the head portion 331. The suction hole 337 may be connected to a vacuum pump. The vacuum pump draws air into the head portion 331 through the suction hole 337. The fingerprint sensing unit 210 may be attached to the suction surface 335 of the head portion 331 by the suction force of the head portion 331.

[0147] According to exemplary embodiments, since the groove 339 is defined in the head portion 331 at a position corresponding to the pad portion 221, damage to the pad portion 221 during bonding of the fingerprint sensor 200 can be substantially prevented. Furthermore, when the pressure applied to the fingerprint sensing unit 210 in the area overlapping the pad portion 221 is reduced due to the groove 339, the deviation in the gap between the fingerprint sensing unit 210 and the display panel 100 can increase after bonding. According to exemplary embodiments, since the protrusion 336 for pressing the second flexible printed circuit board 220 is formed in an area that does not overlap the pad portion 221, pressure loss of the fingerprint sensing unit 210 in the area overlapping the pad portion 221 can be compensated. Consequently, the fingerprint sensing unit 210 and the display panel 100 can be bonded with a uniform spacing without damaging the pad portion 221.

[0148] Figure 12 and Figure 13 is a view illustrating a plurality of distance measurement points according to an exemplary embodiment.

[0149] According to an exemplary embodiment, the first distance measuring unit 430 measures distances from a predetermined reference plane to a plurality of first points 410 located at the adsorption surface 335 of the pickup 330 and / or located at the front surface 211 of the fingerprint sensing unit 210 (where the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the pickup 330). The plurality of first points 410 may include a 1-1 point 411, a 1-2 point 412, a 1-3 point 413, and a 1-4 point 414 corresponding to vertices of a quadrilateral (such as a rectangle, a rhombus, or a square) located on the XY plane.

[0150] According to an exemplary embodiment, the second distance measuring unit 440 measures distances from a predetermined reference plane to a plurality of second points 420 located at the adsorption surface 321 of the stage 320 and / or located at the rear surface 111 of the display panel 100 (where the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320). The plurality of second points 420 may include a 2-1st point 421, a 2-2nd point 422, a 2-3rd point 423, and a 2-4th point 424 corresponding to vertices of a quadrilateral (such as a rectangle, a rhombus, or a square) located on the XY plane.

[0151] In terms of their positions on the XY plane, point 1-1 411, point 1-2 412, point 1-3 413, and point 1-4 414 may respectively correspond to point 2-1 421, point 2-2 422, point 2-3 423, and point 2-4 424. When the fingerprint sensing unit 210 and the display panel 100 are coupled to each other, point 1-1 411, point 1-2 412, point 1-3 413, and point 1-4 414 may respectively overlap with point 2-1 421, point 2-2 422, point 2-3 423, and point 2-4 424.

[0152] The 1-1st point 411, the 1-2nd point 412, the 1-3rd point 413, and the 1-4th point 414 may be points located at the adsorption surface 335 of the picker 330 or points located on the front surface 211 of the fingerprint sensing unit 210. In addition, the 1-1st point 411, the 1-2nd point 412, the 1-3rd point 413, and the 1-4th point 414 may be coordinates on the XY plane.

[0153] The 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 may similarly be points located at the adsorption surface 321 of the stage 320 or points located on the rear surface 111 of the display panel 100. In addition, the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 may be coordinates on the XY plane.

[0154] Reference Figure 13 , point 1-1 411, point 1-2 412, point 1-3 413, and point 1-4 414 may correspond to positions on the XY plane that are different from those of point 2-1 421, point 2-2 422, point 2-3 423, and point 2-4 424. When the fingerprint sensing unit 210 and the display panel 100 are coupled to each other, each of point 1-1 411, point 1-2 412, point 1-3 413, and point 1-4 414 may not overlap with any of point 2-1 421, point 2-2 422, point 2-3 423, and point 2-4 424.

[0155] Figure 14 is a view illustrating a method of measuring a distance to the adsorption surface 335 of the pickup 330 according to an exemplary embodiment.

[0156] The first distance measuring unit 430 may include a plurality of first distance measuring units 431, 432, 433, and 434, which are respectively located at positions substantially the same as those of the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 on the XY plane.

[0157] A plurality of first distance measuring units 431, 432, 433, and 434 measure distances (hereinafter also referred to as third distances) D11, D12, D13, and D14 from the first reference plane RP1 to the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located on the adsorption surface 335 of the pickup 330 along the Z-axis direction. The first reference plane RP1 may be any plane parallel to the XY plane. The distances D11, D12, D13, and D14 from the first reference plane RP1 to the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located on the adsorption surface 335 of the pickup 330 may be used to calculate the thickness deviation of the fingerprint sensing unit 210 and to align the inclination of the adsorption surface 335 of the pickup 330.

[0158] Figure 15 is a view illustrating a method of measuring a distance to the adsorption surface 321 of the stage 320 according to an exemplary embodiment.

[0159] The second distance measuring unit 440 may include a plurality of second distance measuring units 441, 442, 443, and 444, which are respectively located at positions substantially the same as those of the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 on the XY plane.

[0160] The plurality of second distance measuring units 441, 442, 443, and 444 measure distances D21, D22, D23, and D24 (hereinafter referred to as fourth distances) from the second reference plane RP2 to the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located on the adsorption surface 321 of the stage 320 along the Z-axis direction. The second reference plane RP2 may be any plane parallel to the XY plane. The second reference plane RP2 may be substantially the same plane as the first reference plane RP1. The distances D21, D22, D23, and D24 from the second reference plane RP2 to the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located on the adsorption surface 321 of the stage 320 can be used to calculate the thickness deviation of the display panel 100 and for tilt alignment of the adsorption surface 321 of the stage 320.

[0161] Figure 16 is a view illustrating a method of measuring a distance to the front surface 211 of the fingerprint sensing unit 210 (in which the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the pickup 320) according to an exemplary embodiment.

[0162] As described above, the plurality of first distance measurement units 431 , 432 , 433 , and 434 may be located at substantially the same positions as the 1-1 point 411 , the 1-2 point 412 , the 1-3 point 413 , and the 1-4 point 414 , respectively, on the XY plane.

[0163] The plurality of first distance measuring units 431, 432, 433, and 434 measure distances D31, D32, D33, and D34 from the first reference plane RP1 to the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located at the front surface 211 of the fingerprint sensing unit 210 (wherein the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the pickup 330) along the Z-axis direction. Based on the distances D31, D32, D33, and D34 from the first reference plane RP1 to the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located at the front surface 211 of the fingerprint sensing unit 210 (wherein the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the pickup 330) and the distances D31, D32, D33, and D34 from the first reference plane RP1 to the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located at the front surface 211 of the fingerprint sensing unit 210 (wherein the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the pickup 330) The distances D11, D12, D13, and D14 of the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 at the fingerprint sensing unit 210 may be calculated. The thicknesses D11-D31, D12-D32, D13-D33, and D14-D34 of the fingerprint sensing unit 210 at the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 as well as deviations thereof may be calculated.

[0164] Figure 17 3 is a view illustrating a method of measuring a distance to the rear surface 111 of the display panel 100 (in which the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320 ) according to an exemplary embodiment.

[0165] As described above, the plurality of second distance measurement units 441 , 442 , 443 , and 444 may be located at substantially the same positions as the 2-1st point 421 , the 2-2nd point 422 , the 2-3rd point 423 , and the 2-4th point 424 , respectively, on the XY plane.

[0166] A plurality of second distance measuring units 441, 442, 443, and 444 measure distances D41, D42, D43, and D44 from the second reference plane RP2 to a 2-1st point 421, a 2-2nd point 422, a 2-3rd point 423, and a 2-4th point 424 located at the rear surface 111 of the display panel 100 (wherein the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320) along the Z-axis direction. Based on the distances D41, D42, D43, and D44 from the second reference plane RP2 to the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located at the rear surface 111 of the display panel 100 (wherein the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320), and the distances D21, D22, D23, and D24 from the second reference plane RP2 to the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located at the adsorption surface 321 of the stage 320, the thicknesses D21-D41, D22-D42, D23-D43, and D24-D44 of the display panel 100 at the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 can be calculated.

[0167] In addition, if Figure 12 As shown in FIG, when the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 are located at positions substantially the same as those of the 2-1 point 421, the 2-2 point 422, the 2-3 point 423, and the 2-4 point 424 on the XY plane, respectively, and the first reference plane RP1 and the second reference plane RP2 coincide with each other, based on FIG. Figure 16 The distances D31, D32, D33, and D34 from the first reference plane RP1 to the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located at the front surface 211 of the fingerprint sensing unit 210 (where the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the pickup 330) are measured, and based on the Figure 17The distances D41, D42, D43 and D44 measured from the second reference plane RP2 to the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423 and the 2-4th point 424 at the rear surface 111 of the display panel 100 (wherein the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320), the sum of the distance D31 and the distance D41, the sum of the distance D32 and the distance D42, the sum of the distance D33 and the distance D43, the sum of the distance D34 and the distance D44 and their deviations between the fingerprint sensing unit 210 and the display panel 100 at the 1-1st point 411, the 1-2nd point 412, the 1-3rd point 413 and the 1-4th point 414 can be calculated. When the first reference plane RP1 and the second reference plane RP2 are parallel to each other and spaced apart from each other by a predetermined distance, all gaps between the display panel 100 and the fingerprint sensing unit 210 may increase or decrease by the predetermined distance without affecting the deviation.

[0168] Figure 18 and Figure 19 is a view illustrating a method of measuring distances to a first point 410 and a second point 420 according to an exemplary embodiment.

[0169] Reference Figure 18 , the distance to the first point 410 and the distance to the second point 420 can be measured simultaneously.

[0170] The distance measuring unit 390 may include a plurality of first distance measuring units 431, 432, 433, and 434, which are respectively located at positions substantially the same as those of the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 on the XY plane, and may also include a plurality of second distance measuring units 441, 442, 443, and 444, which are respectively located at positions substantially the same as those of the 2-1 point 421, the 2-2 point 422, the 2-3 point 423, and the 2-4 point 424 on the XY plane. The first distance measuring units 431, 432, 433, and 434 and the second distance measuring units 441, 442, 443, and 444 may be fixed to a plate 450 having opposite sides parallel to the XY plane. The plate 450 may be movable in a horizontal direction.

[0171] Reference Figure 19 , the distance to the first point 410 and the distance to the second point 420 can be measured separately. The pickup 330 and the stage 320 can be vertically aligned (see Figure 39 Before S400 in FIG. 4 , the distance to the first point 410 and the distance to the second point 420 are measured.

[0172] Return to reference Figure 14 and Figure 15 , a plurality of first distance measuring units 431, 432, 433, and 434 measure distances D11, D12, D13, and D14 from the first reference plane RP1 to the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located on the suction surface 335 of the pickup 330 along the Z-axis direction. A plurality of second distance measuring units 441, 442, 443, and 444 measure distances D21, D22, D23, and D24 from the second reference plane RP2 to the 2-1 point 421, the 2-2 point 422, the 2-3 point 423, and the 2-4 point 424 located on the suction surface 321 of the stage 320 along the Z-axis direction. The pickup 330 can then be moved horizontally onto the stage 320. In addition, when the plurality of first distance measuring units 431, 432, 433, and 434 are measuring the distance, the first reference plane RP1 may be parallel to the adsorption surface 335 of the pickup 330 and may not be parallel to the second reference plane RP2. Then, with the horizontal movement, the adsorption surface 335 of the pickup 330 or the first reference surface (or may be referred to as the first reference plane) RP1 may be rotated to be parallel to the second reference surface (or may be referred to as the second reference plane) RP2.

[0173] Figure 20 、 Figure 21 and Figure 22 A method of measuring a distance to the front surface 211 of the fingerprint sensing unit 210 (where the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the picker 330) according to an exemplary embodiment is illustrated.

[0174] Reference Figure 20 According to an exemplary embodiment, the distance measuring unit 390 may include a plurality of first distance measuring units 431, 432, 433, and 434 fixed to the plate 450 to be disposed at positions substantially the same as those of the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 on the XY plane. In addition, as Figure 18 As shown in , a plurality of second distance measuring units 441 , 442 , 443 , and 444 may be fixed to a plate 450 .

[0175] Reference Figure 21According to another exemplary embodiment, the first distance measuring unit 435 may be provided separately (i.e., the first distance measuring unit 430 may include only one first distance measuring unit 435). The first distance measuring unit 435 moves parallel to the first reference plane RP1 along the coordinates of the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 on the XY plane. According to the illustrated exemplary embodiment, the driving unit that causes the first distance measuring unit 435 to move horizontally may be provided under the control of the controller 310.

[0176] Reference Figure 22 According to another exemplary embodiment, the first distance measuring unit 435 may be provided separately and may not move. Instead, the horizontal driving unit 365 for controlling the horizontal movement of the pickup 330 may move the adsorption surface 335 of the pickup 330 so that the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 of the adsorption surface 335 of the pickup 330 or the front surface 211 of the fingerprint sensing unit 210 may overlap with the coordinates of the first distance measuring unit 435 on the XY plane in sequence.

[0177] although Figure 20 、 Figure 21 and Figure 22 The first distance measuring unit 430 is shown as an example, but Figures 20 to 22 The configuration shown in can also be applied to the second distance measuring unit 440 .

[0178] Figure 23 and Figure 24 2 is a view illustrating a gap deviation between the front surface 211 of the fingerprint sensing unit 210 and the rear surface 111 of the display panel 100 measured according to an exemplary embodiment.

[0179] Figure 23 It is along the way Figure 12 A cross-sectional view taken at the planes of point 1-1 411, point 1-3 413, point 2-1 421 and point 2-3 423. Figure 24 It is along the way Figure 12 The gap G1 is a distance between the 1-1 point 411 of the front surface 211 of the fingerprint sensing unit 210 and the 2-1 point 421 of the rear surface 111 of the display panel 100. The gap G1 may correspond to the above reference point 412. Figure 16 and Figure 17The distance D31 is described as the sum of the distance D41. The gap G2, the gap G3, and the gap G4 may correspond to the sum of the distance D32 and the distance D42, the sum of the distance D33 and the distance D43, and the sum of the distance D34 and the distance D44, respectively.

[0180] like Figure 23 and Figure 24 As shown in FIG, the front surface 211 of the fingerprint sensing unit 210 measured at the four first points 410 and the rear surface 111 of the display panel 100 measured at the four second points 420 may both be curved surfaces that may not be defined as a flat surface, and their flatness may not be zero. Therefore, by adjusting the inclination of the adsorption surface 321 of the stage 320 or the adsorption surface 335 of the pickup 330, it may not be possible to completely eliminate the deviation in the gap in the Z-axis direction between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensing unit 210 measured at four or more points on the XY plane.

[0181] According to exemplary embodiments, the deviations in the Z-axis direction between the gaps G1, G2, G3, and G4 between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensing unit 210, measured at four points 410 and 420, can be substantially minimized. In exemplary embodiments, the inclination of the adsorption surface 321 of the stage 320 or the adsorption surface 335 of the pickup 330 can be adjusted so that the gaps G1 and G3 measured at diagonal points become substantially equal to each other, and the gaps G2 and G4 measured at diagonal points become substantially equal to each other. For example, the height of the 2-1st point 421 of the rear surface 111 of the display panel 100 is fixed, and the inclination of the adsorption surface 321 of the stage 320 can be adjusted so that the deviation between the gaps G3 and G1 at the 2-3rd point 423 can be increased. Furthermore, the height of the 2-2nd point 422 of the rear surface 111 of the display panel 100 is fixed, and the inclination of the adsorption surface 321 of the stage 320 can be adjusted so that the 2-4th point 424 can rise by the deviation between the gap G4 and the gap G2.

[0182] According to an exemplary embodiment, deviations among the gaps G1, G2, G3, and G4, which may be caused by thickness deviations of the fingerprint sensing unit 210, thickness deviations of the display panel 100, and tilt alignment errors between the adsorption surface 321 of the stage 320 and the adsorption surface 335 of the pickup 330, may be substantially minimized.

[0183] Figure 25 is a view illustrating parallelism according to an exemplary embodiment. Figure 26 and Figure 27is a view illustrating flatness or parallelism according to an exemplary embodiment.

[0184] Hereinafter, the distance will be described as being measured from four first points 411, 412, 413, and 414 located on the front surface 211 of the fingerprint sensing unit 210. However, the inventive concept is not limited thereto, and flatness and parallelism may be applied to distances measured at any four or more arbitrary points located on an arbitrary plane.

[0185] As used herein, parallelism defines the degree to which two objects are parallel to each other. Because parallelism defines the relative pose between two objects, parallelism is determined based on how the pose of one object relates to the pose of the other object. In this context, the reference object is called a benchmark.

[0186] Reference Figure 25 and Figure 27 , assuming that a plane parallel to the XY plane is a reference, the distance ΔDD2 between the two planes 461 and 462, which are parallel to the XY plane and pass through the two points 411 and 413 having the maximum distance difference from each other, becomes the parallelism of the front surface 211 of the fingerprint sensing unit 210. Similarly, referring to Figure 28 and Figure 29 , assuming that a plane parallel to the XY plane is a reference, the distance between the two planes 471 and 472 becomes the parallelism of the rear surface 111 of the display panel 100, and the two planes 471 and 472 are parallel to the XY plane and respectively pass through the two points 423 and 421 having the maximum distance difference from each other.

[0187] Furthermore, flatness as used herein defines how flat the shape of a curved surface is. Flatness can be defined as the minimum distance between two parallel planes.

[0188] Reference Figure 26 and Figure 27 , taking four points arranged at the vertices constituting a quadrilateral shape as a reference, and a distance ΔDD1 between a 1-1st plane 463 and a 1-2nd plane 464 may be the flatness of the front surface 211 of the fingerprint sensing unit 210, wherein the 1-1st plane 463 passes through the 1-1st point 411 and the 1-3rd point 413 in a diagonal direction and is parallel to a straight line passing through the 1-2nd point 412 and the 1-4th point 414 in a diagonal direction, and the 1-2nd plane 464 passes through the 1-2nd point 412 and the 1-4th point 414 in a diagonal direction and is parallel to a straight line passing through the 1-1st point 411 and the 1-3rd point 413 in a diagonal direction.

[0189] If planes parallel to the 1-1 plane 463 and the 1-2 plane 464 defining the flatness of the front surface 211 of the fingerprint sensing unit 210 are references, the parallelism of the front surface 211 of the fingerprint sensing unit 210 becomes minimum at the distance ΔDD1.

[0190] Figure 28 and Figure 29 is a view illustrating the front surface 211 of the fingerprint sensing unit 210 and the rear surface 111 of the display panel 100 measured according to an exemplary embodiment.

[0191] As described above, the flatness of the front surface 211 of the fingerprint sensing unit 210 is defined by the first planes 463 and 464. The first planes 463 and 464 include the 1-1st plane 463, which diagonally passes through the 1-1st point 411 and the 1-3rd point 413 and is parallel to a line diagonally passing through the 1-2nd point 412 and the 1-4th point 414. The 1-2nd plane 464, which diagonally passes through the 1-2nd point 412 and the 1-4th point 414 and is parallel to a line diagonally passing through the 1-1st point 411 and the 1-3rd point 413. The flatness of the front surface 211 of the fingerprint sensing unit 210 is the distance ΔDD1 between the 1-1st plane 463 and the 1-2nd plane 464.

[0192] Furthermore, the flatness of the rear surface 111 of the display panel 100 is defined by second planes 473 and 474. Second planes 473 and 474 include a 2-1st plane 473, which diagonally passes through the 2-1st point 421 and the 2-3rd point 423 and is parallel to a line diagonally passing through the 2-2nd point 422 and the 2-4th point 424. A 2-2nd plane 474, which diagonally passes through the 2-2nd point 422 and the 2-4th point 424 and is parallel to a line diagonally passing through the 2-1st point 421 and the 2-3rd point 423. The flatness of the rear surface 111 of the display panel 100 is a distance ΔDD4 between the 2-1st plane 473 and the 2-2nd plane 474.

[0193] If the planes parallel to the second planes 473 and 474 defining the flatness of the rear surface 111 of the display panel 100 are a reference, the parallelism of the front surface 211 of the fingerprint sensing unit 210 is a distance ΔDD3, where the parallelism is defined by two planes 465 and 466 that are both parallel to the second planes 473 and 474 and pass through the 1-1 point 411 and the 1-3 point 413, respectively.

[0194] Figure 30 and Figure 31is a view illustrating the front surface 211 of the fingerprint sensing unit 210 and the rear surface 111 of the display panel 100 after tilt adjustment according to an exemplary embodiment.

[0195] Similar to the above description, the flatness of the front surface 211 of the fingerprint sensing unit 210 is a distance ΔDD1 , and the flatness of the rear surface 111 of the display panel 100 is a distance ΔDD4 .

[0196] like Figure 30 and Figure 31 As shown in , the inclination of the rear surface 111 of the display panel 100 is adjusted. More specifically, the inclination of the adsorption surface 321 of the stage 320 is adjusted so that the first planes 463 and 464 defining the flatness of the front surface 211 of the fingerprint sensing unit 210 and the second planes 473 and 474 defining the flatness of the rear surface 111 of the display panel 100 are parallel to each other.

[0197] Therefore, the parallelism of the front surface 211 of the fingerprint sensing unit 210 with respect to the rear surface 111 of the display panel 100 (more specifically, with respect to the second planes 473 and 474 defining the flatness of the rear surface 111 of the display panel 100) becomes minimum at a distance ΔDD1 (which is equal to the flatness). In addition, the parallelism of the rear surface 111 of the display panel 100 with respect to the front surface 211 of the fingerprint sensing unit 210 (more specifically, with respect to the first planes 463 and 464 defining the flatness of the front surface 211 of the fingerprint sensing unit 210) becomes minimum at a distance ΔDD4 (which is equal to the flatness).

[0198] Figure 32 、 Figure 33 、 Figure 34 and Figure 35 3 is a view illustrating a method of adjusting the inclination of the adsorption surface 321 of the stage 320 and / or the inclination of the adsorption surface 335 of the pickup 330 according to an exemplary embodiment.

[0199] like Figure 32As shown in , according to an exemplary embodiment, the inclination of the adsorption surface 321 of the stage 320 and / or the inclination of the adsorption surface 335 of the pickup 330 may be adjusted so that the gap G1 and the gap G3 measured at a point in the diagonal direction become substantially equal to each other and become the gap G1' and the gap G3', and the gap G2 and the gap G4 measured at a point in the diagonal direction become substantially equal to each other and become the gap G2' and the gap G4'. Alternatively, as described above, the inclination of the adsorption surface 321 of the stage 320 and / or the inclination of the adsorption surface 335 of the pickup 330 may be adjusted so that the first planes 463 and 464 defining the flatness of the front surface 211 of the fingerprint sensing unit 210 and the second planes 473 and 474 defining the flatness of the rear surface 111 of the display panel 100 may be parallel to each other.

[0200] Reference Figure 33 According to another exemplary embodiment, the inclination of the adsorption surface 321 of the stage 320 and the inclination of the adsorption surface 335 of the pickup 330 may be adjusted so that the inclination of the rear surface 111 of the display panel 100 and the inclination of the front surface 211 of the fingerprint sensing unit 210 are substantially parallel to the XY plane, or so that the parallelism of the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensing unit 210 relative to the XY plane becomes substantially minimum.

[0201] Reference Figure 34 According to yet another exemplary embodiment, although the inclination of the adsorption surface 321 of the stage 320 is not adjusted, the inclination of the adsorption surface 335 of the picker 330 may be adjusted so that the inclination of the rear surface 111 of the display panel 100 and the inclination of the front surface 211 of the fingerprint sensing unit 210 are substantially parallel to each other.

[0202] Reference Figure 35 According to yet another exemplary embodiment, although the inclination of the adsorption surface 335 of the picker 330 is not adjusted, the inclination of the adsorption surface 321 of the stage 320 may be adjusted so that the inclination of the rear surface 111 of the display panel 100 and the inclination of the front surface 211 of the fingerprint sensing unit 210 are substantially parallel to each other.

[0203] Figure 36 are views illustrating a method of aligning the stage 320 and the picker 330 in a vertical direction after tilt adjustment and a method of recognizing a distance deviation between the front surface 211 of the fingerprint sensing unit 210 and the rear surface 111 of the display panel 100 according to an exemplary embodiment.

[0204] Reference Figure 36After adjusting the inclination of the adsorption surface 321 of the stage 320 and / or the inclination of the adsorption surface 335 of the pickup 330, the camera unit 380 can capture images of the adsorption surface 321 of the stage 320 and the adsorption surface 335 of the pickup 330. The controller 310 analyzes the images captured by the camera unit 380 and calculates a positional error between the sensing area 142 of the display panel 100 (where the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320) and the front surface 211 of the fingerprint sensing unit 210. The controller 310 controls the horizontal driving unit 365 based on the positional error calculated from the captured images to horizontally move or rotate the adsorption surface 335 of the pickup 330 so that the fingerprint sensing unit 210 accurately overlaps with the sensing area 142 in the vertical direction (Z-axis direction).

[0205] In addition, refer to Figure 36 After adjusting the inclination of the adsorption surface 321 of the stage 320 and / or the inclination of the adsorption surface 335 of the pickup 330, as described above with reference to Figures 16 to 24 In the manner described above, the distances D41', D42', D43', and D44' to the rear surface 111 of the display panel 100 and the distances D31', D32', D33', and D34' to the front surface 211 of the fingerprint sensing unit 210 are measured again at the plurality of points 410 and 420. The remeasured distances D31', D32', D33', D34', D41', D42', D43', and D44' can be used to confirm the adjusted inclination. In addition, the remeasured distances D31', D32', D33', D34', D41', D42', D43', and D44' can be used to determine the descending distance MD of the adsorption surface 335 of the pickup 330 (see Figure 38 )(or the rising distance of the adsorption surface 321 of the stage 320).

[0206] Figure 37 is a view illustrating a method of applying the adhesive 145 to the rear surface 111 of the display panel 100 according to an exemplary embodiment.

[0207] Reference Figure 37 After measuring the gap between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensing unit 210 at a plurality of points, the adhesive injector 370 applies the adhesive 145 onto the rear surface 111 of the display panel 100. However, the inventive concept is not limited thereto, and in some exemplary embodiments, the adhesive injector 370 may apply the adhesive 145 onto the front surface 211 of the fingerprint sensing unit 210.

[0208] Figure 38is a view illustrating a method of combining the front surface 211 of the fingerprint sensing unit 210 and the rear surface 111 of the display panel 100 according to an exemplary embodiment.

[0209] Reference Figure 38 , the controller 310 determines the descending distance (or referred to as the moving distance) MD of the adsorption surface 335 of the pickup 330 (or the ascending distance of the adsorption surface 321 of the stage 320) based on the distances D1', D2', D3', and D4' between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensor 200 (specifically, the front surface 211 of the fingerprint sensing unit 210) measured at a plurality of points. As described above with reference to Figure 36 As described above, the gaps G1', G2', G3', and G4' between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensor 200 may be determined based on the distances D1', D2', D3', and D4' between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensor 200 remeasured at a plurality of points. Figures 16 to 24 The controller 310 can determine the distances D1, D2, D3 and D4 between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensor 200 after the tilt adjustment by measuring the distances D1, D2, D3 and D4 between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensor 200 at multiple points and the predicted changes in the gaps G1', G2', G3' and G4' between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensor 200 after the tilt adjustment.

[0210] The gap (G") between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensor 200 may be a minimum value, an average value, or a maximum value of the gaps G1', G2', G3', and G4' between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensor 200 after the tilt adjustment. The descending distance MD may be determined as a value obtained by subtracting a predetermined thickness of the adhesive 145 after bonding (or a predetermined gap between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensor 200 after bonding) from G". The controller 310 controls the vertical driving unit 360 so that the adsorption surface 335 of the picker 330 descends in the vertical direction by the determined descending distance MD.

[0211] Figure 39 is a flowchart illustrating a method of combining the front surface 211 of the fingerprint sensing unit 210 and the rear surface 111 of the display panel 100 according to an exemplary embodiment.

[0212] The bonding method according to an exemplary embodiment may include aligning the inclination of the adsorption surface 335 of the pickup 330 and the inclination of the adsorption surface 321 of the stage 320 (S100). The adsorption surface 335 of the pickup 330 may be a first planar surface, and the adsorption surface 321 of the stage 320 may be a second planar surface. The adsorption surface 335 of the pickup 330 may be aligned to have a 1-1th inclination, and the adsorption surface 321 of the stage 320 may be aligned to have a 2-1th inclination. The 1-1th inclination and the 2-1st inclination may be defined as a normal vector of the adsorption surface 335 of the pickup 330 and a normal vector of the adsorption surface 321 of the stage 320, respectively. The 1-1th inclination of the adsorption surface 335 of the pickup 330 and the 2-1th inclination of the adsorption surface 321 of the stage 320 may be aligned to be substantially the same. For example, the adsorption surface 335 of the picker 330 and the adsorption surface 321 of the stage 320 may be aligned to be parallel to a horizontal plane (wherein the horizontal plane is perpendicular to the gravity direction or the vertical direction). Figure 40 Describe its detailed description.

[0213] like Figure 11 As shown in FIG, the rear surface 212 of the fingerprint sensing unit 210 is adsorbed and fixed to the adsorption surface 335 of the picker 330 (S200), and the front surface of the display panel 100 is adsorbed and fixed to the adsorption surface 321 of the stage 320 (S300). The front surface of the display panel 100 may refer to the front surface of the display unit 120 or the front surface of the window 130.

[0214] In the above description, the fingerprint sensing unit 210 and the display panel 100 are described as being adsorbed and fixed to the pickup 330 and the stage 320, but the inventive concept is not limited thereto. For example, in some exemplary embodiments, the fingerprint sensing unit 210 and the display panel 100 may be attached to the pickup 330 and the stage 320, respectively, by various methods, such as adsorption by a vacuum pump and attachment by static electricity.

[0215] Then, the picker 330 to which the fingerprint sensing unit 210 is adsorbed and the stage 320 to which the display panel 100 is adsorbed may be aligned in a vertical direction (S400), which will be referred to below. Figure 41 are described in more detail.

[0216] Then, if Figure 12 、 Figure 13 as well as Figures 16 to 22As shown in FIG, first distances D31, D32, D33, and D34 of a plurality of first points 410 located on the front surface 211 of the fingerprint sensing unit 210 are measured by the first distance measuring unit 430 (S500), and second distances D41, D42, D43, and D44 of a plurality of second points 420 located on the rear surface 111 of the display panel 100 are measured by the second distance measuring unit 440 (S600). The rear surface 111 of the display panel 100 may refer to the rear surface 111 of the substrate 110 where the predetermined sensing area 142 is exposed by the composite sheet 140.

[0217] Then, the inclination of at least one of the adsorption surface 321 (eg, the second planar surface) of the stage 320 and the adsorption surface 335 (eg, the first planar surface) of the pickup 330 is adjusted ( S700 ).

[0218] More specifically, if Figure 34 As shown in , the controller 310 can output a first control signal for adjusting the inclination of the first planar surface 335 of the pickup 330 from a 1-1th inclination to a 1-2th inclination based on the first distances D31, D32, D33 and D34 and the second distances D41, D42, D43 and D44, and the first inclination adjustment unit 350 can adjust the inclination of the first planar surface 335 according to the first control signal.

[0219] Alternatively, as Figure 35 As shown in , the controller 310 can output a second control signal for adjusting the inclination of the second planar surface 321 of the stage 320 from a 2-1st inclination to a 2-2nd inclination, and the second inclination adjustment unit 340 can adjust the inclination of the second planar surface 321 according to the second control signal.

[0220] Alternatively, Figure 33 As shown in , the controller 310 can output a first control signal for adjusting the inclination of the first planar surface 335 of the pickup 330 from the 1-1 inclination to the 1-2 inclination based on the first distances D31, D32, D33 and D34 and the second distances D41, D42, D43 and D44, the first inclination adjustment unit 350 can adjust the inclination of the first planar surface 335 according to the first control signal, the controller 310 can output a second control signal for adjusting the inclination of the second planar surface 321 of the stage 320 from the 2-1 inclination to the 2-2 inclination based on the first distances D31, D32, D33 and D34 and the second distances D41, D42, D43 and D44, and the second inclination adjustment unit 340 can adjust the inclination of the second planar surface 321 according to the second control signal.

[0221] The method for determining the 1st-2nd inclination and the 2nd-2nd inclination is as follows Figures 23 to 32 As shown in the following. Figures 42 to 45 A method of determining the 1st-2nd inclination and the 2nd-2nd inclination is described in detail.

[0222] Then, the controller 310 may determine the vertical movement distance of at least one of the pickup 330 and the stage 320 (S800). As described above, the inclination of the suction surface 321 of the stage 320 and the inclination of the suction surface 335 of the pickup 330 are adjusted to the 1-2 inclination and the 2-2 inclination, respectively. Therefore, the controller 310 may determine the vertical movement distance MD of at least one of the pickup 330 and the stage 320 based on the first distances D31', D32', D33', and D34' to the plurality of first points 410 and the second distances D41', D42', D43', and D44' to the plurality of second points 420 after the inclination adjustment.

[0223] like Figure 36 As shown in FIG, when the adsorption surface 335 of the pickup 330 is adjusted to the 1-2 inclination, the first distance measuring unit 430 can re-measure the first distances D31', D32', D33', and D34' to the plurality of first points 410 located on the front surface 211 of the fingerprint sensing unit 210. When the inclination of the adsorption surface 335 of the pickup 330 is not adjusted (i.e., it has the 1-1 inclination), the first distances D31, D32, D33, and D34 to the plurality of first points 410 do not change. When the adsorption surface 321 of the stage 320 is adjusted to the 2-2 inclination, the second distance measuring unit 440 can re-measure the second distances D41', D42', D43', and D44' to the plurality of second points 420 located on the rear surface 111 of the display panel 100. When the inclination of the adsorption surface 321 of the stage 320 is not adjusted (ie, it has the 2-1st inclination), the second distances D41 , D42 , D43 , and D44 to the plurality of second points 420 do not change.

[0224] Optionally, the controller 310 can calculate the first distances D31', D32', D33' and D34' to the multiple first points 410 after adjusting to the 1-2 inclination and the second distances D41', D42', D43' and D44' to the multiple second points 420 after adjusting to the 2-2 inclination based on the difference between the 1-1 inclination and the 1-2 inclination and the difference between the 2-1 inclination and the 2-2 inclination without re-measuring the step.

[0225] The controller 310 determines the moving distance MD (=G″-PG) as a value obtained by subtracting a predetermined setting value (PG) from the gap (G″) between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensing unit 210 (determined based on the first distances D31′, D32′, D33′, and D34′ to the plurality of first points 410 after adjustment to the 1-2nd inclination and the second distances D41′, D42′, D43′, and D44′ to the plurality of second points 420 after inclination adjustment) (S800). The predetermined setting value (PG) may correspond to the thickness of the adhesive 145 after bonding (or the gap between the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensor 200). The predetermined setting value may be approximately 5 μm or greater (or approximately 10 μm or greater). In addition, the predetermined setting value may be approximately 20 μm or less (or approximately 15 μm or less).

[0226] Then, the adhesive injector 370 applies the adhesive 145 onto the rear surface 111 of the display panel 100 (more specifically, onto the sensing area 142 or the front surface 211 of the fingerprint sensing unit 210) (S900). The adhesive 145 may be applied to a portion of at least one of the rear surface 111 of the display panel 100 or the front surface 211 of the fingerprint sensing unit 210 at a thickness greater than a predetermined set value (PG), and then the adhesive 145 may be spread onto the front surface 211 of the fingerprint sensing unit 210 by pressure applied during the bonding process between the display panel 100 and the fingerprint sensing unit 210.

[0227] Then, the vertical drive unit 360 moves at least one of the adsorption surface 335 of the pickup 330 and the adsorption surface 321 of the stage 320 in the vertical direction so that the front surface 211 of the fingerprint sensing unit 210 and the rear surface 111 of the display panel 100 are combined with each other (S1000). The vertical drive unit 360 can move the adsorption surface 335 of the pickup 330 in the vertical direction by a determined movement distance MD under the control of the controller 310. Alternatively, the vertical drive unit 360 can move the adsorption surface 321 of the stage 320 in the vertical direction by the determined movement distance MD. Alternatively, the vertical drive unit 360 can move the adsorption surface 335 of the pickup 330 and the adsorption surface 321 of the stage 320 toward each other so that they are spaced apart from each other by a predetermined set value (PG).

[0228] Figure 40 is a flowchart illustrating a method of aligning the inclination of the adsorption surface 321 of the stage 320 and the inclination of the adsorption surface 335 of the pickup 330 according to an exemplary embodiment. Figure 40 The flowchart shown in FIG. 1 can be used in conjunction with the flowchart according to the exemplary embodiment. Figure 39 This corresponds to step S100 shown in FIG.

[0229] First, the picker 330 is moved onto the stage 320 ( S110 ).

[0230] Then, if Figure 14 As shown in FIG, the first distance measuring units 431, 432, 433, and 434 measure distances D11, D12, D13, and D14 from the first reference plane RP1 to the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located at the adsorption surface 335 of the pickup 330 (S120). The first reference plane RP1 may be any plane parallel to the XY plane.

[0231] The controller 310 calculates the parallelism of the suction surface 335 of the pickup 330 relative to the first reference plane RP1 using the deviations between the distances D11, D12, D13, and D14 (S130). The parallelism of the suction surface 335 of the pickup 330 relative to the first reference plane RP1 can be defined as the maximum deviation between the distances D11, D12, D13, and D14.

[0232] The controller 310 compares the parallelism of the suction surface 335 of the pickup 330 with a predetermined parallelism tolerance A1 (S140). When the parallelism of the suction surface 335 of the pickup 330 is greater than the predetermined parallelism tolerance A1, the controller 310 adjusts the inclination of the suction surface 335 of the pickup 330 so that the parallelism of the suction surface 335 of the pickup 330 becomes substantially minimum (i.e., the suction surface 335 of the pickup 330 is substantially parallel to the first reference plane RP1) (S150). The predetermined parallelism tolerance A1 may be approximately 5 μm, approximately 10 μm, or approximately 20 μm.

[0233] After the inclination is adjusted, the parallelism of the suction surface 335 of the pickup 330 may be checked again (S120, S130, and S140). When the parallelism of the suction surface 335 of the pickup 330 is less than the predetermined parallelism tolerance A1, the adjusted inclination of the suction surface 335 of the pickup 330 may be set to a 1-1th inclination.

[0234] like Figure 15 As shown in FIG, the second distance measuring units 441, 442, 443, and 444 measure distances D21, D22, D23, and D24 from the second reference plane RP2 to the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located on the adsorption surface 321 of the stage 320 (S160). The second reference plane RP2 may be any plane parallel to the XY plane. The second reference plane RP2 may be a plane substantially the same as the first reference plane RP1.

[0235] The controller 310 calculates the parallelism of the adsorption surface 321 of the stage 320 relative to the second reference plane RP2 using the deviations between the distances D21, D22, D23, and D24 (S170). The parallelism of the adsorption surface 321 of the stage 320 relative to the second reference plane RP2 can be defined as the maximum deviation between the distances D21, D22, D23, and D24.

[0236] The controller 310 compares the parallelism of the adsorption surface 321 of the stage 320 with a predetermined parallelism tolerance A1 (S180). When the parallelism of the adsorption surface 321 of the stage 320 is greater than the predetermined parallelism tolerance A1, the controller 310 adjusts the inclination of the adsorption surface 321 of the stage 320 so that the parallelism of the adsorption surface 321 of the stage 320 becomes substantially minimum (i.e., the adsorption surface 321 of the stage 320 is substantially parallel to the second reference plane RP2) (S190).

[0237] After the inclination is adjusted, the parallelism of the adsorption surface 321 of the stage 320 may be checked again (S160, S170, and S180). When the parallelism of the adsorption surface 321 of the stage 320 is less than the predetermined parallelism tolerance A1, the adjusted inclination of the adsorption surface 321 of the stage 320 may be set to the 2-1st inclination.

[0238] Figure 41 is a flowchart illustrating a method of aligning the inclination of the adsorption surface 321 of the stage 320 and the inclination of the adsorption surface 335 of the pickup 330 according to an exemplary embodiment. Figure 41 The flowchart shown in FIG. 1 can be used in conjunction with the flowchart according to the exemplary embodiment. Figure 39 Corresponding to step S400 shown in .

[0239] As described above, the rear surface 212 of the fingerprint sensing unit 210 is adsorbed and fixed to the adsorption surface 335 of the picker 330 (S200), the front surface of the display panel 100 is adsorbed and fixed to the adsorption surface 321 of the stage 320 (S300), and then the picker 330 is moved to a predetermined position on the stage 320.

[0240] The camera unit 380 images the rear surface 111 of the display panel 100 (where the display panel 100 is fixed to the adsorption surface 321 of the stage 320) and the front surface 211 of the fingerprint sensing unit 210 (where the fingerprint sensing unit 210 is fixed to the adsorption surface 335 of the pickup 330) (S410).

[0241] The controller 310 analyzes the image captured by the camera unit 380 to calculate a positional error between the sensing area 142 of the display panel 100 (where the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320) and the front surface 211 of the fingerprint sensing unit 210 (S420). The positional error may refer to an error in the horizontal direction when the sensing area 142 of the rear surface 111 of the display panel 100 and the front surface 211 of the fingerprint sensing unit 210 are vertically coupled by the vertical drive unit. The positional error may include distance errors in two directions (X-axis direction and Y-axis direction) perpendicular to the vertical direction (Z-axis direction) and a rotational error around the vertical direction (Z-axis direction).

[0242] The controller 310 compares the position error with a predetermined tolerance A2 ( S430 ).

[0243] When the position error is greater than the predetermined tolerance A2, the horizontal driving unit 365 moves or rotates the adsorption surface 335 of the picker 330 horizontally under the control of the controller 310 so that the fingerprint sensing unit 210 and the sensing area 142 are accurately overlapped in the vertical direction (Z-axis direction) (S440).

[0244] The vertical alignment ( S410 , S420 , S430 , and S440 ) of the stage 320 and the pickup 330 may be performed again after the tilt adjustment ( S700 ) of the suction surface 321 of the stage 320 and the suction surface 335 of the pickup 330 .

[0245] Figure 42 is a flowchart illustrating a method of adjusting the inclination of the adsorption surface 321 of the stage 320 and the inclination of the adsorption surface 335 of the pickup 330 according to an exemplary embodiment. Figure 42 The flowchart shown in FIG. 1 can be used in conjunction with the flowchart according to the exemplary embodiment. Figure 39 The steps S500 to S700 shown in FIG.

[0246] The first distance measuring units 431, 432, 433, and 434 measure first distances D31, D32, D33, and D34 from the first reference plane RP1 to the first-1st point 411, the first-2nd point 412, the first-3rd point 413, and the first-4th point 414 located at the front surface 211 of the fingerprint sensing unit 210 (where the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the pickup 330) (S1110). The first reference plane RP1 may be any plane parallel to the XY plane.

[0247] The controller 310 calculates the parallelism of the front surface 211 of the fingerprint sensing unit 210 relative to the first reference plane RP1 using the deviations between the first distances D31, D32, D33, and D34 (S1120). The parallelism of the front surface 211 of the fingerprint sensing unit 210 relative to the first reference plane RP1 may be defined as the maximum deviation between the first distances D31, D32, D33, and D34. The parallelism of the front surface 211 of the fingerprint sensing unit 210 relative to the first reference plane RP1 may be the same as the above reference plane. Figures 26 to 31 The described distance ΔDD2 corresponds.

[0248] The controller 310 compares the parallelism of the front surface 211 of the fingerprint sensing unit 210 relative to the first reference plane RP1 with a predetermined parallelism tolerance A3 (S1130). The predetermined parallelism tolerance A3 may be about 5 μm, about 10 μm, or about 20 μm.

[0249] When the parallelism of the front surface 211 of the fingerprint sensing unit 210 is greater than the predetermined parallelism tolerance A3, the controller 310 controls the inclination of the adsorption surface 335 of the aligned picker 330 from the 1-1 inclination to the 1-2 inclination, so that the parallelism of the front surface 211 of the fingerprint sensing unit 210 relative to the first reference plane RP1 is reduced (more preferably, substantially minimized) (S1140).

[0250] The first reference plane RP1 may be any plane parallel to the XY plane. Alternatively, the first reference plane RP1 may be any plane parallel to the adsorption surface 321 of the stage 320 having the 2-1st inclination before the inclination adjustment. The adsorption surface 321 of the stage 320 having the 2-1st inclination may be any plane parallel to the XY plane.

[0251] After the tilt adjustment, the parallelism of the front surface 211 of the fingerprint sensing unit 210 may be checked again ( S1110 , S1120 , and S1130 ).

[0252] The second distance measuring units 441, 442, 443, and 444 measure second distances D41, D42, D43, and D44 from the second reference plane RP2 to the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located at the rear surface 111 of the display panel 100 (where the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320) (S1150). The second reference plane RP2 may be any plane parallel to the first reference plane RP1.

[0253] The controller 310 calculates the parallelism of the rear surface 111 of the display panel 100 with respect to the second reference plane RP2 using the deviations between the second distances D41, D42, D43, and D44 (S1160). The parallelism of the rear surface 111 of the display panel 100 with respect to the second reference plane RP2 may be defined as the maximum deviation between the second distances D41, D42, D43, and D44. The parallelism of the rear surface 111 of the display panel 100 with respect to the second reference plane RP2 may be the same as the maximum deviation between the second distances D41, D42, D43, and D44. Figures 26 to 31 The described correspondence (similar to ΔDD2).

[0254] The controller 310 compares the parallelism of the rear surface 111 of the display panel 100 relative to the second reference plane RP2 with a predetermined parallelism tolerance A4 (S1170). The predetermined parallelism tolerance A4 may be about 5 μm, about 10 μm, or about 20 μm.

[0255] When the parallelism of the rear surface 111 of the display panel 100 is greater than the predetermined parallelism tolerance A4, the controller 310 controls the inclination of the adsorption surface 321 of the console 320 from the 2-1 inclination to the 2-2 inclination, so that the parallelism of the rear surface 111 of the display panel 100 relative to the second reference plane RP2 is reduced (more preferably, substantially minimized) (S1180).

[0256] The second reference plane RP2 may be any plane parallel to the XY plane. Alternatively, the second reference plane RP2 may be any plane parallel to the adsorption surface 335 of the pickup 330 having the 1-1th inclination before the inclination adjustment. The adsorption surface 335 of the pickup 330 having the 1-1th inclination may be any plane parallel to the XY plane.

[0257] After the tilt adjustment, the parallelism of the rear surface 111 of the display panel 100 may be checked again ( S1150 , S1160 , and S1170 ).

[0258] In some exemplary embodiments, steps S1150 , S1160 , S1170 , and S1180 for checking the parallelism of the rear surface 111 of the display panel 100 may be omitted. In this case, the first reference plane RP1 is an arbitrary plane parallel to the adsorption surface 321 of the stage 320 .

[0259] The controller 310 calculates the parallelism of the front surface 211 of the fingerprint sensing unit 210 relative to the adsorption surface 321 of the stage 320 based on the deviations between the first distances D31, D32, D33, and D34 measured in step S1110 (S1120). The controller 310 controls the inclination of the adsorption surface 335 of the pickup 330 from the first inclination of 1-1 to the first inclination of 1-2 so that the parallelism of the front surface 211 of the fingerprint sensing unit 210 relative to the adsorption surface 321 of the stage 320 decreases (more preferably, substantially minimizes) (S1140). However, the inventive concept is not limited thereto, and in some exemplary embodiments, the controller 310 may control the inclination of the adsorption surface 321 of the stage 320 from the second inclination of 2-1 to the second inclination of 2-2 so that the parallelism of the front surface 211 of the fingerprint sensing unit 210 relative to the adsorption surface 321 of the stage 320 decreases (more preferably, substantially minimizes).

[0260] Therefore, regardless of the thickness deviation of the display panel 100, the inclination of at least one of the adsorption surface 321 of the stage 320 and the adsorption surface 335 of the picker 330 can be adjusted so that the parallelism of the front surface 211 of the fingerprint sensing unit 210 relative to the adsorption surface 321 of the stage 320 (or relative to the front surface of the display panel 100 receiving the user's fingerprint) can be substantially minimized.

[0261] Similar to the above description, in an exemplary embodiment, the steps of checking the parallelism of the front surface 211 of the fingerprint sensing unit 210 (S1110, S1120, S1130, and S1140) may be omitted. In this case, the second reference plane RP2 is an arbitrary plane parallel to the adsorption surface 335 of the pickup 330.

[0262] Figure 43 3 is a flowchart illustrating a method of adjusting the inclination of the adsorption surface 321 of the stage 320 and / or the inclination of the adsorption surface 335 of the pickup 330 according to an exemplary embodiment. According to an exemplary embodiment, Figure 43 The flowchart shown in Figure 39 The steps S500 to S700 shown in FIG.

[0263] As described above in step S1110, first distances D31, D32, D33, and D34 of the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located at the front surface 211 of the fingerprint sensing unit 210 (wherein the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the pickup 330) are measured (S1210).

[0264] like Figure 28 and Figure 29As shown in FIG, the controller 310 determines the inclination of the first planes 463 and 464 (wherein the first planes 463 and 464 define the flatness of the front surface 211 of the fingerprint sensing unit 210 (i.e., the distance ΔDD1)) using the deviations between the first distances D31, D32, D33 and D34 (S1220).

[0265] Furthermore, as in the above-described step S1150, second distances D41, D42, D43, and D44 of the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located at the rear surface 111 of the display panel 100 (wherein the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320) are measured (S1230).

[0266] The controller 310 determines the inclination of the second planes 473 and 474 defining the flatness of the rear surface 111 of the display panel 100 (ie, the distance ΔDD4 ) using deviations between the second distances D41 , D42 , D43 , and D44 ( S1240 ).

[0267] The controller 310 calculates the error between the inclination of the first planes 463 and 464 and the inclination of the second planes 473 and 474 (S1250). The inclination of the first planes 463 and 464 and the inclination of the second planes 473 and 474 can be defined as normal vectors perpendicular to the corresponding planes. The error between the inclination of the first planes 463 and 464 and the inclination of the second planes 473 and 474 can be defined as the angle between each normal vector.

[0268] The controller 310 compares the error between the inclination of the first planes 463 and 464 and the inclination of the second planes 473 and 474 with a predetermined tolerance A5 (S1260). The predetermined tolerance A5 may be approximately 1 degree, 2 degrees, 3 degrees, or 5 degrees.

[0269] When the error between the inclination of the first planes 463 and 464 and the inclination of the second planes 473 and 474 is greater than the predetermined tolerance A5, the controller 310 adjusts the inclination of at least one of the adsorption surface 335 of the pickup 330 and the adsorption surface 321 of the stage 320 so that the error between the inclination of the first planes 463 and 464 and the inclination of the second planes 473 and 474 is reduced (more preferably, so that the inclination of the first planes 463 and 464 becomes substantially equal to the inclination of the second planes 473 and 474) (S1270).

[0270] After the inclination adjustment, the error between the inclination of the first planes 463 and 464 and the inclination of the second planes 473 and 474 may be checked again ( S1210 to S1270 ).

[0271] Figure 44 is a flowchart illustrating a method of adjusting the inclination of the adsorption surface 321 of the stage 320 and / or the inclination of the adsorption surface 335 of the pickup 330 according to another exemplary embodiment. Figure 44 The flowchart shown in FIG. 1 can be combined with the flowchart according to another exemplary embodiment. Figure 39 The steps S500 to S700 shown in FIG.

[0272] As described above in step S1110, first distances D31, D32, D33, and D34 of the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located at the front surface 211 of the fingerprint sensing unit 210 (wherein the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the pickup 330) are measured (S1310).

[0273] Furthermore, as in the above-described step S1150, second distances D41, D42, D43, and D44 of the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located at the rear surface 111 of the display panel 100 (wherein the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320) are measured (S1320).

[0274] like Figure 12 As shown in , the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 may correspond to positions substantially the same as those of the 2-1 point 421, the 2-2 point 422, the 2-3 point 423, and the 2-4 point 424, respectively, on the XY plane.

[0275] Based on Figure 16 The first distances D31, D32, D33 and D34 from the first reference plane RP1 to the 1-1 point 411, the 1-2 point 412, the 1-3 point 413 and the 1-4 point 414 located at the front surface 211 of the fingerprint sensing unit 210 (where the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the pickup 330), respectively, are measured, and based on the following Figure 17The controller 310 may determine the second distances D41, D42, D43 and D44 measured from the second reference plane RP2 to the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423 and the 2-4th point 424 located at the rear surface 111 of the display panel 100 (wherein the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320), respectively, and the gaps G1 (=D31+D41), G2 (=D32+D42), G3 (=D33+D43) and G4 (=D34+D44) between the 1-1st point 411, the 1-2nd point 412, the 1-3rd point 413 and the 1-4th point 414 and the corresponding points among the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423 and the 2-4th point 424, respectively (S1330).

[0276] The controller 310 calculates deviations between the gaps G1, G2, G3, and G4 (S1340). The controller 310 may calculate the deviation between the gap G1 and the gap G3 and the deviation between the gap G2 and the gap G4, respectively (S1340).

[0277] The controller 310 compares each of the deviations between the gaps G1 and G3 and the deviations between the gaps G2 and G4 with a predetermined tolerance A6 ( S1350 ). The predetermined tolerance A6 may be about 5 μm, about 10 μm, or about 20 μm.

[0278] When the deviation between the gap G1 and the gap G3 is greater than the predetermined tolerance A6, the controller 310 adjusts the inclination of at least one of the adsorption surface 335 of the pickup 330 and the adsorption surface 321 of the stage 320 so that the deviation between the gap G1 and the gap G3 is reduced (more specifically, so that they become substantially the same) (S1360). In addition, when the deviation between the gap G2 and the gap G4 is greater than the predetermined tolerance A6, the controller 310 adjusts the inclination of at least one of the adsorption surface 335 of the pickup 330 and the adsorption surface 321 of the stage 320 so that the deviation between the gap G2 and the gap G4 is reduced (more specifically, so that they become substantially the same) (S1360).

[0279] After the inclination adjustment, deviations among the gaps G1 , G2 , G3 , and G4 may be checked again ( S1310 to S1360 ).

[0280] Figure 45 is a flowchart illustrating a method of adjusting the inclination of the adsorption surface 321 of the stage 320 and / or the inclination of the adsorption surface 335 of the pickup 330 according to another exemplary embodiment. Figure 45 The flowchart shown in FIG. 1 can be combined with the flowchart according to another exemplary embodiment. Figure 39 The steps S500 to S700 shown in FIG.

[0281] As described above in step S1110, first distances D31, D32, D33, and D34 of the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located at the front surface 211 of the fingerprint sensing unit 210 (wherein the fingerprint sensing unit 210 is adsorbed to the adsorption surface 335 of the pickup 330) are measured (S1410).

[0282] In addition, if Figure 14 As shown in FIG, third distances D11, D12, D13, and D14 can be measured from the 1-1 point 411, the 1-2 point 412, the 1-3 point 413, and the 1-4 point 414 located at the adsorption surface 335 having the 1-1 slope of the pickup 330. Alternatively, the distances to the adsorption surface 335 having the 1-1 slope of the pickup 330 can be preset.

[0283] As mentioned above Figure 14 and Figure 16 As described above, based on the first distances D31, D32, D33 and D34 to the 1-1 point 411, the 1-2 point 412, the 1-3 point 413 and the 1-4 point 414 located at the front surface 211 of the fingerprint sensing unit 210 and the third distances D11, D12, D13 and D14 to the 1-1 point 411, the 1-2 point 412, the 1-3 point 413 and the 1-4 point 414 located at the adsorption surface 335 of the pickup 330, the thicknesses D11-D31, D12-D32, D13-D33 and D34-D14 of the fingerprint sensing unit 210 at the 1-1 point 411, the 1-2 point 412, the 1-3 point 413 and the 1-4 point 414 can be calculated (S1420).

[0284] Furthermore, as in the above-described step S1150, second distances D41, D42, D43, and D44 of the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located at the rear surface 111 of the display panel 100 (wherein the display panel 100 is adsorbed to the adsorption surface 321 of the stage 320) are measured (S1430).

[0285] In addition, if Figure 15 As shown in FIG, fourth distances D21, D22, D23, and D24 from the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located at the adsorption surface 321 having the 2-1st inclination of the stage 320 can be measured. Alternatively, the distances from the adsorption surface 321 having the 2-1st inclination of the stage 320 can be predetermined.

[0286] As mentioned above Figure 15 and Figure 17 As described above, based on the second distances D41, D42, D43, and D44 to the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located at the rear surface 111 of the display panel 100, and based on the distances D21, D22, D23, and D24 to the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 located at the adsorption surface 321 of the stage 320, the controller 310 may calculate the thicknesses D21-D41, D22-D42, D23-D43, and D24-D44 of the display panel 100 at the 2-1st point 421, the 2-2nd point 422, the 2-3rd point 423, and the 2-4th point 424 (S1440).

[0287] Based on the thicknesses D11-D31, D12-D32, D13-D33, and D14-D34 of the fingerprint sensing unit 210 and based on the thicknesses D21-D41, D22-D42, D23-D43, and D24-D44 of the display panel 100, the controller 310 may determine a gap G1 between the 1-1 point 411 and the 2-1 point 421, a gap G2 between the 1-2 point 412 and the 2-2 point 422, a gap G3 between the 1-3 point 413 and the 2-3 point 423, and a gap G4 between the 1-4 point 414 and the 2-4 point 424 (S1450).

[0288] The distance between the adsorption surface 335 of the pickup 330 having the 1-1st inclination and the adsorption surface 321 of the stage 320 having the 2-1st inclination may have a predetermined value. Figure 14 and Figure 15 , the distance between the adsorption surface 335 having the 1-1st inclination of the pickup 330 and the adsorption surface 321 having the 2-1st inclination of the stage 320 is measured. The gaps G1, G2, G3, and G4 can be obtained by subtracting the sum of the thicknesses D11-D31, D12-D32, D13-D33, and D14-D34 of the fingerprint sensing unit 210 and the thicknesses D21-D41, D22-D42, D23-D43, and D24-D44 of the display panel 100 from the distance between the adsorption surface 335 having the 1-1st inclination of the pickup 330 and the adsorption surface 321 having the 2-1st inclination of the stage 320.

[0289] like Figure 44As shown in step S1340 shown in FIG, the controller 310 calculates the deviations between the gaps G1, G2, G3, and G4 (S1460). As in step S1350, the controller 310 compares the deviations between the gaps G1, G2, G3, and G4 with a predetermined tolerance A7 (S1470). The predetermined tolerance A7 may be approximately 5 μm, approximately 10 μm, or approximately 20 μm.

[0290] As in step S1360 , the controller 310 adjusts the inclination of at least one of the adsorption surface 335 of the pickup 330 and the adsorption surface 321 of the stage 320 so that deviations among the gaps G1 , G2 , G3 , and G4 may be reduced ( S1480 ).

[0291] After the inclination adjustment, deviations among the gaps G1 , G2 , G3 , and G4 may be checked again ( S1410 to S1480 ).

[0292] In an exemplary embodiment, the thickness of the fingerprint sensing unit 210 may be calculated based on the thicknesses D11-D31, D12-D32, D13-D33, and D14-D34 and the thicknesses D21-D41, D22-D42, D23-D43, and D24-D44 of the display panel 100. Figure 42 , the parallelism of the front surface 211 of the fingerprint sensing unit 210 and the parallelism of the rear surface 111 of the display panel 100 are shown in FIG.

[0293] In addition, the thickness of the fingerprint sensing unit 210 may be determined based on the thicknesses D11-D31, D12-D32, D13-D33, and D14-D34 and the thicknesses D21-D41, D22-D42, D23-D43, and D24-D44 of the display panel 100. Figure 43 , the inclinations of the first planes 463 and 464 (wherein the first planes 463 and 464 define the flatness of the front surface 211 of the fingerprint sensing unit 210) and the inclinations of the second planes 473 and 474 (wherein the second planes 473 and 474 define the flatness of the rear surface 111 of the display panel 100) shown in FIG.

[0294] As described above, according to one or more exemplary embodiments, the parallelism between the rear surface of the display panel and the front surface of the fingerprint sensor may be improved.

[0295] Although certain exemplary embodiments and implementations have been described herein, other embodiments and modifications will be apparent from this description. Accordingly, the inventive concept is not limited to such embodiments, but rather to the broader scope of the appended claims and various obvious modifications and equivalent arrangements as will be apparent to those skilled in the art.

Claims

1. A device for integrating a fingerprint sensor into a display panel, the device comprising: a picker for fixing a rear surface of a fingerprint sensing unit of the fingerprint sensor, the picker comprising a first planar surface having a 1-1th inclination; a table for fixing the front surface of the display panel, the table comprising a second planar surface having a 2-1 inclination; a first distance measuring unit configured to measure first distances from a first reference plane to a plurality of first points located on a front surface of the fingerprint sensing unit; a second distance measuring unit, configured to measure second distances from a second reference plane to a plurality of second points located on a rear surface of the display panel; a controller configured to output a control signal, the control signal including at least one of a first control signal for adjusting the inclination of the first planar surface of the pickup from the 1-1 inclination to the 1-2 inclination based on the first distance and the second distance, and a second control signal for adjusting the inclination of the second planar surface of the stage from the 2-1 inclination to the 2-2 inclination based on the first distance and the second distance; an inclination adjustment unit, comprising at least one of a first inclination adjustment unit and a second inclination adjustment unit, wherein the first inclination adjustment unit is configured to adjust the inclination of the first planar surface according to the first control signal, and the second inclination adjustment unit is configured to adjust the inclination of the second planar surface based on the second control signal; as well as a vertical driving unit for moving at least one of the first planar surface and the second planar surface along a first direction so that the front surface of the fingerprint sensing unit and the rear surface of the display panel are combined with each other, The first reference plane is a plane perpendicular to the first direction and where the first distance measuring unit is located, and the second reference plane is a plane perpendicular to the first direction and where the second distance measuring unit is located.

2. The apparatus according to claim 1, further comprising an adhesive injector for applying an adhesive onto at least one of the front surface of the fingerprint sensing unit and the rear surface of the display panel, the adhesive comprising a curable resin.

3. The apparatus according to claim 1, further comprising: a horizontal driving unit for moving the first planar surface of the pickup in a direction perpendicular to the first direction; as well as a camera unit for imaging the front surface of the fingerprint sensing unit and the rear surface of the display panel, in: The controller analyzes the image captured by the camera unit to generate a third control signal; and The horizontal driving unit receives the third control signal and causes the front surface of the fingerprint sensing unit and the sensing area of ​​the display panel to overlap each other in the first direction.

4. The device according to claim 1, wherein The first planar surface having the 1-1th inclination and the second planar surface having the 2-1th inclination are parallel to each other.

5. The apparatus according to claim 1, wherein: The plurality of first points include point 1-1, point 1-2, point 1-3 and point 1-4; The point 1-1, the point 1-2, the point 1-3 and the point 1-4 correspond to vertices of the first quadrilateral; The point 1-1 and the point 1-3 are located on the diagonal line 1-1 of the first quadrilateral; The 1-2 point and the 1-4 point are located on the 1-2 diagonal line of the first quadrilateral; The plurality of second points include point 2-1, point 2-2, point 2-3 and point 2-4; The point 2-1, the point 2-2, the point 2-3, and the point 2-4 correspond to vertices of the second quadrilateral; The 2-1st point and the 2-3th point are located on the 2-1st diagonal of the second quadrilateral; The 2-2nd point and the 2-4th point are located on the 2-2nd diagonal of the second quadrilateral; and The controller determines at least one of the 1-2 inclination and the 2-2 inclination based on the 1-1 distance, the 1-2 distance, the 1-3 distance and the 1-4 distance to the 1-1 point, the 1-2 point, the 1-3 point and the 1-4 point respectively, and the 2-1 distance, the 2-2 distance, the 2-3 distance and the 2-4 distance to the 2-1 point, the 2-2 point, the 2-3 point and the 2-4 point respectively, and the at least one of the 1-2 inclination and the 2-2 inclination makes the 1-1 diagonal line, the 1-2 diagonal line, the 2-1 diagonal line and the 2-2 diagonal line parallel to a plane.

6. The device according to claim 5, wherein: The point 1-1, the point 1-2, the point 1-3, and the point 1-4 overlap with the point 2-1, the point 2-2, the point 2-3, and the point 2-4, respectively, in the first direction; and The controller determines a first gap between the point 1-1 and the point 2-1, a second gap between the point 1-2 and the point 2-2, a third gap between the point 1-3 and the point 2-3, and a fourth gap between the point 1-4 and the point 2-4 based on the 1-1 distance, the 1-2 distance, the 1-3 distance, and the 1-4 distance to the point 1-1, the point 1-2, the point 1-3, and the point 1-4, respectively, and the 2-1 distance, the 2-2 distance, the 2-3 distance, and the 2-4 distance to the point 2-1, the point 2-2, the point 2-3, and the point 2-4, respectively.

7. The device according to claim 6, wherein The controller determines at least one of the 1-2 inclination and the 2-2 inclination based on differences among the first gap, the second gap, the third gap, and the fourth gap, and the at least one of the 1-2 inclination and the 2-2 inclination makes the first gap and the third gap equal to each other and makes the second gap and the fourth gap equal to each other.

8. The device according to claim 6, wherein The controller: determining an inclination of a first plane based on the first distance, the first plane defining a flatness of the front surface of the fingerprint sensing unit; determining an inclination of a second plane based on the second distance, the second plane defining the flatness of the rear surface of the display panel; and At least one of the 1-2 inclination and the 2-2 inclination is determined based on the inclination of the first plane and the inclination of the second plane, and the at least one of the 1-2 inclination and the 2-2 inclination makes the first planar surface and the second planar surface parallel to each other.

9. The apparatus according to claim 8, wherein: The first plane defining the flatness of the front surface of the fingerprint sensing unit includes a 1-1 plane and a 1-2 plane, the 1-1 plane and the 1-2 plane having a minimum spacing distance between them among two parallel planes of a first group, the plurality of first points of the front surface of the fingerprint sensing unit being located on the 1-1 plane and the 1-2 plane, and The second plane that limits the flatness of the rear surface of the display panel includes a 2-1 plane and a 2-2 plane, and the 2-1 plane and the 2-2 plane have a minimum spacing distance between them among the two parallel planes of the second group, and the multiple second points of the rear surface of the display panel are located on the 2-1 plane and the 2-2 plane.

10. The apparatus according to claim 1, wherein: the controller determining a movement distance of the at least one of the first planar surface and the second planar surface in the first direction based on the first distance, the second distance, and a predetermined distance between the rear surface of the display panel and the front surface of the fingerprint sensing unit after the combination; and The vertical driving unit moves the at least one of the first planar surface and the second planar surface by the moving distance.

11. A device for integrating a fingerprint sensor into a display panel, the device comprising: a picker for fixing a rear surface of a fingerprint sensing unit of the fingerprint sensor, the picker comprising a first planar surface having a 1-1th inclination; a table for fixing the front surface of the display panel, the table comprising a second planar surface having a 2-1 inclination; a first distance measuring unit configured to measure first distances from a first reference plane to a plurality of first points located on a front surface of the fingerprint sensing unit; a controller configured to output a control signal, the control signal including at least one of a first control signal for adjusting the inclination of the first planar surface of the pickup from the 1-1 inclination to the 1-2 inclination based on the first distance, and a second control signal for adjusting the inclination of the second planar surface of the stage from the 2-1 inclination to the 2-2 inclination based on the first distance; a tilt adjustment unit, comprising at least one of a first tilt adjustment unit and a second tilt adjustment unit, wherein the first tilt adjustment unit is configured to adjust the tilt of the first planar surface according to the first control signal, and the second tilt adjustment unit is configured to adjust the tilt of the second planar surface according to the second control signal; as well as a vertical driving unit for moving at least one of the first planar surface and the second planar surface along a first direction so that the front surface of the fingerprint sensing unit and the rear surface of the display panel are combined with each other, The first reference plane is a plane perpendicular to the first direction and where the first distance measuring unit is located.

12. The device according to claim 11, wherein The controller determines at least one of the 1-2nd inclination and the 2-2nd inclination that minimizes parallelism of the front surface of the fingerprint sensing unit with respect to the second planar surface.

13. The device according to claim 11, wherein The controller: determining an inclination of a first plane based on the first distance, the first plane defining a flatness of the front surface of the fingerprint sensing unit; and At least one of the 1-2 inclination and the 2-2 inclination is determined based on the inclination of the first plane and the 2-1 inclination of the second plane surface, and the at least one of the 1-2 inclination and the 2-2 inclination makes the first plane surface and the second plane surface parallel to each other.

14. A device for joining a first component to a second component, the device comprising: a pickup for fixing the rear surface of the first assembly, the pickup comprising a first planar surface having a first inclination of 1-1; a table for fixing the front surface of the second component, the table comprising a second planar surface having a 2-1 inclination; a first distance measuring unit for measuring first distances from a first reference plane to a plurality of first points located on a front surface of the first component; a second distance measuring unit for measuring second distances from a second reference plane to a plurality of second points located on a rear surface of the second component; a controller configured to output a control signal, the control signal including at least one of a first control signal for adjusting the inclination of the first planar surface of the pickup from the 1-1 inclination to the 1-2 inclination based on the first distance and the second distance, and a second control signal for adjusting the inclination of the second planar surface of the stage from the 2-1 inclination to the 2-2 inclination based on the first distance and the second distance; a tilt adjustment unit, comprising at least one of a first tilt adjustment unit and a second tilt adjustment unit, wherein the first tilt adjustment unit adjusts the tilt of the first planar surface based on the first control signal and the second tilt adjustment unit adjusts the tilt of the second planar surface based on the second control signal; as well as a vertical driving unit for moving at least one of the first planar surface and the second planar surface along a first direction so that the front surface of the first component and the rear surface of the second component are coupled to each other, The first reference plane is a plane perpendicular to the first direction and where the first distance measuring unit is located, and the second reference plane is a plane perpendicular to the first direction and where the second distance measuring unit is located.

15. A picker for bonding a fingerprint sensor to a display panel, the fingerprint sensor comprising a fingerprint sensing unit and a flexible printed circuit board, the fingerprint sensing unit having a front surface to be bonded to the display panel and a rear surface opposite the front surface, the flexible printed circuit board being bonded to the rear surface of the fingerprint sensing unit, the picker being configured to pick up the fingerprint sensor and transfer the fingerprint sensor toward the display panel, and comprising: a head portion for supporting the fingerprint sensor, the head portion including a first surface, a second surface, and a third surface, the first surface being in contact with the rear surface of the fingerprint sensing unit, the second surface being in contact with the flexible printed circuit board, and the third surface overlapping the fingerprint sensing unit and the flexible printed circuit board in a plan view and defining a groove relative to the first surface and the second surface.

16. The pickup according to claim 15, wherein: The second surface does not overlap with the fingerprint sensing unit in a plan view; The third surface is spaced apart from the fingerprint sensing unit and the flexible printed circuit board; and The second surface is disposed between the first surface and the third surface in a direction perpendicular to the first surface and the second surface.

17. The pickup according to claim 15, wherein A step difference between the first surface and the second surface is equal to or smaller than a thickness of the flexible printed circuit board.

18. The pickup according to claim 15, wherein The second surface includes the same material as that forming the first surface or a material having elasticity.

19. A method for integrating a fingerprint sensor into a display panel, the method comprising the following steps: Fixing a rear surface of a fingerprint sensing unit of the fingerprint sensor to a first planar surface of a pickup, the first planar surface having a first inclination of 1-1; fixing the front surface of the display panel to a second planar surface of the stage, the second planar surface having a 2-1 first inclination; measuring, by a first distance measuring unit, first distances from a first reference plane to a plurality of first points located at a front surface of the fingerprint sensing unit; measuring, by a second distance measuring unit, second distances from a second reference plane to a plurality of second points located at a rear surface of the display panel; Outputting a control signal through a controller, the control signal including at least one of a first control signal for adjusting the inclination of the first planar surface of the pickup from the 1-1 inclination to the 1-2 inclination based on the first distance and the second distance, and a second control signal for adjusting the inclination of the second planar surface of the stage from the 2-1 inclination to the 2-2 inclination based on the first distance and the second distance; adjusting the inclination of the first planar surface through a first inclination adjustment unit according to the first control signal, and adjusting the inclination of the second planar surface through a second inclination adjustment unit based on the second control signal; as well as moving at least one of the first planar surface and the second planar surface along a first direction by a vertical driving unit so that the front surface of the fingerprint sensing unit and the rear surface of the display panel are combined with each other, The first reference plane is a plane perpendicular to the first direction and where the first distance measuring unit is located, and the second reference plane is a plane perpendicular to the first direction and where the second distance measuring unit is located.

20. The method according to claim 19, wherein The step of outputting the control signal includes: determining an inclination of a first plane based on the first distance, the first plane defining the flatness of the front surface of the fingerprint sensing unit; and determining an inclination of a second plane based on the second distance, the second plane defining the flatness of the rear surface of the display panel, and The step also includes determining at least one of the 1-2 inclination and the 2-2 inclination based on the inclination of the first plane and the inclination of the second plane, and the at least one of the 1-2 inclination and the 2-2 inclination makes the first plane surface and the second plane surface parallel to each other.

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