Display device including flexible printed circuit board

Abstract

The present application relates to a display device. The display device includes: a display panel including a display area and a non-display area; and a flexible printed circuit board connected to the display panel in the non-display area, wherein the flexible printed circuit board includes a base film, an electrode pad disposed on one side of the base film, a circuit pattern connected to the electrode pad, a covering layer overlapping at least a portion of the circuit pattern, and a covering resin overlapping at least a portion of the covering layer and the circuit pattern. The covering layer includes a main body portion and a protruding portion protruding from the main body portion.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0152403, filed on November 25, 2019, which is hereby incorporated by reference for all purposes as if fully set forth herein. Technical Field

[0003] Exemplary embodiments of the present invention relate generally to a flexible printed circuit board, and more particularly, to a display device including the flexible printed circuit board. Background Art

[0004] A display device (such as a liquid crystal display (LCD), an organic light emitting diode (OLED) display, etc.) includes a display panel in which an image is displayed and a driver (such as a gate driver, a data driver, etc.) for driving the display panel. The data driver may be provided in the form of a separate chip and thus may be electrically connected to the display panel. The gate driver may be integrated with the display panel rather than provided as a chip. Alternatively, the display device may include a touch panel and a touch driver for driving the touch panel.

[0005] The display panel or the touch panel includes a pad area in which pads for receiving external signals are arranged, and electronic components such as a flexible printed circuit board are coupled to the pad area.

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

[0007] Exemplary embodiments of the present invention provide a flexible printed circuit board that effectively prevents foreign particles or moisture from penetrating, and a display device including the same.

[0008] Additional features of the inventive concept 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 concept.

[0009] An exemplary embodiment of the present invention provides a flexible printed circuit board, including a base film, an electrode pad disposed on one side of the base film, a circuit pattern connected to the electrode pad, a cover layer overlapping at least a portion of the circuit pattern, and a covering resin overlapping at least a portion of the cover layer and the circuit pattern. The cover layer includes a main body portion and a protruding portion protruding from the main body portion.

[0010] The covering resin may overlap the protruding portion.

[0011] The covering resin may overlap at least a portion of the main body portion.

[0012] At least a portion of the circuit pattern may overlap the protruding portion.

[0013] The cover layer may include a plurality of protruding portions.

[0014] The plurality of protruding portions may be disposed spaced apart from each other at regular intervals.

[0015] The cover resin may be spaced apart from the electrode pad on a plane.

[0016] The cover layer may be spaced apart from the electrode pad on a plane.

[0017] Another exemplary embodiment of the present invention provides a display device, comprising: a display panel including a display area and a non-display area; and a flexible printed circuit board coupled to the display panel in the non-display area. The flexible printed circuit board includes a base film, an electrode pad disposed on one side of the base film, a circuit pattern connected to the electrode pad, a cover layer overlapping at least a portion of the circuit pattern, and a cover resin overlapping at least a portion of the cover layer and the circuit pattern, and wherein the cover layer includes a main body portion and a protruding portion protruding from the main body portion.

[0018] The display panel may include a pad portion located in the non-display area, and the pad portion may be electrically connected to the electrode pad.

[0019] The display device may further include an anisotropic conductive film between the pad portion and the electrode pad.

[0020] The anisotropic conductive film may be spaced apart from the cover resin in a plane.

[0021] The anisotropic conductive film is spaced apart from the cover layer in a plane.

[0022] The covering resin may overlap the protruding portion.

[0023] The covering resin may overlap at least a portion of the main body portion.

[0024] At least a portion of the circuit pattern may overlap the protruding portion.

[0025] The cover layer may include a plurality of protruding portions.

[0026] Another exemplary embodiment of the present invention provides a display device, including: a touch panel including a touch area and a peripheral area; and a flexible printed circuit board coupled to the touch panel in the peripheral area. The flexible printed circuit board includes a base film, an electrode pad disposed on one side of the base film, a circuit pattern connected to the electrode pad, a cover layer overlapping at least a portion of the circuit pattern, and a cover resin overlapping at least a portion of the cover layer and the circuit pattern. The cover layer includes a main body portion and a protruding portion protruding from the main body portion.

[0027] The touch panel may include a pad portion located in the peripheral area, and the pad portion may be electrically connected to the electrode pad.

[0028] The display device may further include an anisotropic conductive film disposed between the pad portion and the electrode pad.

[0029] The exemplary embodiments may provide a flexible printed circuit board that effectively prevents foreign particles or moisture from penetrating, and may improve the reliability of a display device including the flexible printed circuit board.

[0030] 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

[0031] The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the invention and together with the description serve to explain the inventive concept.

[0032] Figure 1 is a schematic top view of a display device according to an exemplary embodiment of the present invention.

[0033] Figure 2 is a schematic top view of a display device according to an exemplary embodiment of the present invention.

[0034] Figure 3 is a top view of some constituent elements of a flexible printed circuit board according to an exemplary embodiment of the present invention.

[0035] Figure 4 yes Figure 3 , a cross-sectional view taken along line IV-IV'.

[0036] Figure 5 is a top view of some constituent elements of a flexible printed circuit board according to an exemplary embodiment of the present invention.

[0037] Figure 6 yes Figure 5, a cross-sectional view taken along line VI-VI'.

[0038] Figure 7 is a cross-sectional view of a flexible printed circuit board according to an exemplary embodiment of the present invention.

[0039] Figure 8 is a cross-sectional view of a flexible printed circuit board having a touch pad attached thereto according to an exemplary embodiment of the present invention.

[0040] Fig. 9 A specific area of ​​a display device according to a comparative example is shown. DETAILED DESCRIPTION

[0041] In the following description, for the purpose of illustration, many specific details are elaborated to provide a thorough understanding of various exemplary embodiments of the present invention. As used herein, "embodiment" is a non-limiting example of one or more devices or methods using the inventive concept disclosed herein. However, it is apparent that various exemplary embodiments can be put into practice without these specific details or with one or more equivalent arrangements. In other examples, in order to avoid unnecessarily obscuring various exemplary embodiments, known structures and devices are shown in block diagram form. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shape, configuration and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0042] Unless otherwise specified, the exemplary embodiments shown should be understood as providing exemplary features of different details of some 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 of various embodiments (hereinafter, individually or collectively referred to as "elements") may be combined, separated, interchanged and / or rearranged without departing from the inventive concept.

[0043] The use of cross hatching and / or shading in the drawings is generally to make the boundaries between adjacent elements clear. Therefore, unless otherwise specified, the presence or absence of cross hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, ratio, commonality between illustrated elements and / or any other characteristics, attributes, properties, etc. of the elements. In addition, in the drawings, the size and relative size of the elements may be exaggerated for the purpose of clarity and / or description. When the exemplary embodiments can be implemented differently, the specific processing sequence can be performed differently from the described sequence. For example, two processes described in succession can be performed substantially simultaneously, or in an order opposite to the described order. In addition, the same reference numerals represent the same elements.

[0044] When an element such as a layer is referred to as being "on", "connected to" or "coupled to" another element or layer, it may be directly located on, directly connected to or coupled to another element or layer, or there may be an intervening element or layer. However, when an element or layer is referred to as being "directly located" on, "directly connected to" or "directly coupled to" another element or layer, there is no intervening element or layer. For this reason, the term "connection" may represent a physical connection, electrical connection and / or fluid connection in the presence or absence of an intervening element. In addition, the D1 axis, the D2 axis and the D3 axis are not limited to the three axes (such as, x-axis, y-axis and z-axis) of a rectangular coordinate system, and may be interpreted in a broader sense. For example, the D1 axis, the D2 axis and the D3 axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purpose of this disclosure, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as, for example, XYZ, XYY, YZ, and ZZ. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0045] Although the terms "first", "second", etc. can be used in this article to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another element. Therefore, without departing from the teachings of the present disclosure, the first element discussed below can be referred to as the second element.

[0046] Spatially relative terms such as "beneath," "below," "under," "lower," "above," "upper," "over," "higher," "side" (e.g., as in "sidewall"), and the like may be used herein for descriptive purposes, and thereby to describe the relationship of one element to another element(s) as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, elements described as being "below" or "beneath" other elements or features would then be oriented to be "above" the other elements or features. Thus, the exemplary term "below" may encompass both the above and below orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0047] The terms used herein are for the purpose of describing a particular embodiment, rather than being intended to be limiting. Unless the context clearly indicates otherwise, as used herein, the singular forms "one", "an" and "the" are intended to also include plural forms. In addition, when used in this specification, the terms "comprise", "comprises", "includes" and / or "includes" represent the existence of stated features, integral bodies, steps, operations, elements, parts and / or their sets, but do not exclude the existence or addition of one or more other features, integral bodies, steps, operations, elements, parts and / or their sets. It should also be noted that, as used herein, the terms "substantially", "about" and other similar terms are used as approximate terms and not as degree terms, and are therefore used to allow for 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.

[0048] Various exemplary embodiments are described herein with reference to cross-sectional views and / or exploded views, which are schematic diagrams of idealized exemplary embodiments and / or intermediate structures. Therefore, deviations from the illustrated shapes due to, for example, manufacturing techniques and / or tolerances are expected. Therefore, the exemplary embodiments disclosed herein should not necessarily be construed as limited to the specific illustrated shapes of the regions, but will include deviations in shape due to, for example, manufacturing. In this manner, the regions shown in the drawings may be schematic in nature, and the shapes of these regions may not reflect the actual shapes of the regions of the device, and are therefore not necessarily intended to be limiting.

[0049] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. Terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0050] Furthermore, in this specification, the phrase "on a plane" means observing a target portion from the top, and the phrase "on a cross section" means observing a cross section formed by vertically cutting the target portion from one side.

[0051] In the following, reference will be made to Figure 1 and Figure 2 A display device according to an exemplary embodiment is described. Figure 1 is a schematic top view of a display device according to an exemplary embodiment, and Figure 2 is a top plan view of a display device according to an exemplary embodiment.

[0052] Reference Figure 1 , a display device according to an exemplary embodiment includes a display panel 300, a flexible printed circuit board 200 connected to the display panel 300, and a printed circuit board 100 connected to the flexible printed circuit board 200. The display panel 300 may be an organic light emitting panel or a liquid crystal panel, but the inventive concept is not limited thereto.

[0053] The display panel 300 includes a display area DA in which an image is displayed, and a non-display area NA disposed at an outer edge of the display area DA. The non-display area NA includes elements and / or wirings for generating and / or transmitting various signals applied to the display area DA. Figure 1 , one edge region of the display panel 300 (i.e., the lower region of the display panel 300) is shown as the non-display region NA, but other edge regions of the display panel 300 (e.g., the left and right edge regions and / or the upper edge region) may correspond to the non-display region NA. The display region DA is shown as a quadrangle, but the display region DA may have various shapes other than the quadrangle, such as a circle, an ellipse, a polygon, etc.

[0054] A plurality of pixels PX are arranged in the display panel 300, for example, in a matrix format. Signal lines such as gate lines (not shown), data lines (not shown), etc. are also provided in the display area DA. The gate lines may extend approximately in the row direction (i.e., the horizontal direction), and the data lines may extend approximately in the column direction (i.e., the vertical direction). Each pixel PX is connected to the gate line and the data line, and may receive a gate signal and a data signal from the signal line. In the case of an organic light emitting diode (OLED) display, for example, a driving voltage line (not shown) that extends approximately in the column direction and transmits a driving voltage to the pixel PX may be provided.

[0055] A pad portion PP1 may be provided in the non-display area NA of the display panel 300, in which an electrode for receiving an external signal of the display panel 300 is provided. One end of the flexible printed circuit board 200 is connected to the pad portion PP1. The other end of the flexible printed circuit board 200 is connected to the pad portion PP2 of the printed circuit board 100, and the printed circuit board 100 may transmit a signal such as image data, etc.

[0056] The driving device that generates and / or processes various signals for driving the display panel 300 may be located in the non-display area NA of the display panel 300 or in the flexible printed circuit board 200, or may be located in an external printed circuit board. The driving device may include a data driver that applies a data signal to a data line, a gate driver that applies a gate signal to a gate line, and a signal control part that controls the data driver and the gate driver.

[0057] According to an exemplary embodiment, the data driver may be mounted on the flexible printed circuit board 200 in the form of an integrated circuit chip 400 and connected to the pad portion PP1. However, unlike what is shown in the drawings, the data driver may be mounted in the non-display area NA between the display area DA and the pad portion PP1 in the form of an integrated circuit chip. The gate driver may be integrated with a non-display area (not shown) at the left edge and / or the right edge of the display panel 300, or may be provided in the form of an integrated circuit chip. The signal control portion may be formed in the integrated circuit chip 400 together with the data driver, or may be provided as a separate integrated circuit chip.

[0058] Next, refer to Figure 2 , the display device according to the exemplary embodiment may include a touch panel 300'. The touch panel 300' may include a touch area TA and a peripheral area PA. The first electrode pattern portion 156 and the second electrode pattern portion 166 used as position sensing electrodes may be disposed in the touch area TA of the touch panel 300'. The reference may be omitted. Figure 1 Any description of components that are identical to those described.

[0059] A plurality of first electrode pattern portions 156 may be arranged in a first direction D1. Here, the first direction D1 may be, for example, an x-axis direction. The first electrode pattern portion 156 includes first sensor electrodes 150 and 154 formed in a rhombus shape or a diamond shape, and a bridge 152 connecting adjacent first sensor electrodes 150 and 154. In addition, the first sensor electrodes 150 and 154 are electrically connected to the first signal wiring 158, and receive a driving voltage through a first touch pad provided in the pad portion PP1.

[0060] A plurality of second electrode pattern portions 166 may be arranged in the second direction D2 so that the second electrode pattern portions 166 intersect with the first electrode pattern portions 156. Here, the second direction D2 may be, for example, the y-axis direction. The second electrode pattern portion 166 may include second sensor electrodes 160 and 164 and a connecting portion 162, wherein the second sensor electrodes 160 and 164 are formed in a rhombus shape or a diamond shape, and the connecting portion 162 is arranged in the same layer as the second sensor electrodes 160 and 164 and connects the second sensor electrodes 160 and 164 adjacent to each other in the second direction D2. The second sensor electrodes 160 and 164 are electrically connected to the second signal wiring 168, and provide a voltage or current that varies according to whether a touch is performed or not performed to the second touch pad located in the pad portion PP1.

[0061] A pad portion PP1 in which electrodes for transmitting or receiving signals to or from the outside of the touch panel 300' are disposed is located in the peripheral area PA. One end of the flexible printed circuit board 200' is connected to the pad portion PP1. The other end of the flexible printed circuit board 200' is connected to the pad portion PP2 of the printed circuit board 100.

[0062] The pad portion PP1 may include a first touch pad connected to the first signal wiring 158 and a second touch pad connected to the second signal wiring 168 .

[0063] The pad portion PP1 located in the non-display area NA of the display panel 300 and in the flexible printed circuit board 200 may be as shown in FIG. Figure 1 As described above, the pad portion PP1 located in the peripheral area PA of the flexible printed circuit board 200' and the touch panel 300' may be connected as described above. Figure 2 Hereinafter, the flexible printed circuit boards 200 and 200' connected to the display panel 300 or the touch panel 300' will be described.

[0064] In the following, reference will be made to Figures 3 to 6 A flexible printed circuit board 200 according to an exemplary embodiment is described. Figure 3is a top view of some constituent elements of a flexible printed circuit board according to an exemplary embodiment; Figure 4 yes Figure 3 , a sectional view taken along line IV-IV'; Figure 5 is a top view of some constituent elements of a flexible printed circuit board according to an exemplary embodiment; and Figure 6 yes Figure 5 , a cross-sectional view taken along line VI-VI'.

[0065] First, refer to Figure 3 and Figure 4 , a flexible printed circuit board 200 according to an exemplary embodiment includes a base film 210 , an electrode pad 211 , a circuit pattern 212 , and a cover layer 220 .

[0066] The base film 210 is a part that becomes the body of the flexible printed circuit board 200 and may be formed of a material such as polyimide, etc. The base film 210 may have a thickness of about 20 μm, but the inventive concept is not limited thereto. The thickness of the base film 210 may be within a range that does not deform the flexible printed circuit board 200 while considering flexibility and rigidity.

[0067] The electrode pad 211 and the circuit pattern 212 connected to the electrode pad 211 are located on one side of the base film 210. The electrode pad 211 and the circuit pattern 212 are formed of a material such as copper (Cu). For example, copper (Cu) may be formed on the base film 210 by a patterning process. In addition, although not shown, the electrode pad 211 and the circuit pattern 212 may have a multilayer structure so that the electrode pad 211 and the circuit pattern 212 may be connected to each other through a hole while an insulating layer is provided between the electrode pad 211 and the circuit pattern 212.

[0068] The electrode pad 211 may be connected to the pad portion PP1 of the display panel or the touch panel (see Figure 1 or Figure 2 ) and may be electrically connected to an electrode pad or a touch pad provided in the pad portion PP1. Figure 3 As shown in FIG. 1 , the flexible printed circuit board 200 according to the exemplary embodiment may include a plurality of electrode pads 211 arranged in parallel with each other along the same direction. The plurality of electrode pads 211 may have various shapes on a plane.

[0069] The circuit pattern 212 may be physically and electrically connected to the electrode pad 211. The circuit pattern 212 may be connected to a portion of pads in which a plurality of integrated circuits (ICs) and drivers are disposed. Although not shown, the circuit pattern 212 according to the exemplary embodiment may further include an electrode pad connected to another flexible printed circuit board.

[0070] The capping layer 220 according to the exemplary embodiment may minimize the penetration of foreign particles into the circuit pattern 212 and the electrode pad 211. In addition, the capping layer 220 may prevent the circuit pattern 212 from being damaged. In addition, the capping layer 220 may insulate the electrical connection between adjacent circuit patterns 212.

[0071] The cover layer 220 may overlap at least a portion of the circuit pattern 212 and may not overlap the electrode pad 211. Figure 3 , the cover layer 220 may have a shape spaced apart on a plane from the electrode pad 211. When the cover layer 220 overlaps the electrode pad 211, anisotropic wiring (which will be described later) may not be easily attached, or a short circuit may occur between wirings.

[0072] The cover layer 220 according to the exemplary embodiment may include a body portion 221 and a protrusion portion 222. The protrusion portion 222 protrudes from the body portion 221 with respect to the virtual reference line VL1. The cover layer 220 may be attached to the base film 210 with respect to the virtual reference line VL1.

[0073] The protrusion portion 222 may overlap at least a portion of the circuit pattern 212 , but the inventive concept is not limited thereto. The protrusion portion 222 may be spaced apart from the circuit pattern 212 on a plane.

[0074] The covering layer 220 according to the exemplary embodiment may include a plurality of protruding portions 222. The plurality of protruding portions 222 may be provided with a predetermined interval, but are not limited thereto, and may be provided in a variety of forms. The number of protruding portions 222 may be appropriately selected for adhering the covering layer 220 and even for applying the covering resin, which will be described later. For example, when the covering resin is dripped on n positions, the number of protruding portions 222 may be n, or may have a number similar to n.

[0075] With the above description Figure 1 Reference Figure 5 and Figure 6 , the flexible printed circuit board 200 according to the exemplary embodiment may be connected with the pad portion PP1 of the display panel or the pad portion PP1 of the touch panel described above through the anisotropic conductive film 231 .

[0076] The electrode pad 211 of the flexible printed circuit board 200 may be disposed to face the pad portion PP1 of the display panel or the touch panel, and the anisotropic conductive film 231 may be disposed between the electrode pad 211 and the pad portion PP1. One side of the anisotropic conductive film 231 is coupled to the flexible printed circuit board 200, and the other side of the anisotropic conductive film 231 may be coupled to the pad portion PP1 of the touch panel or the display panel.

[0077] The anisotropic conductive film 231 may include an adhesive resin and conductive balls. When heat and pressure are applied, the density of the conductive balls increases so that the electrode pad 211 and the pad portion PP1 may be electrically connected.

[0078] The flexible printed circuit board 200 according to the exemplary embodiment may further include a cover resin 232. The cover resin 232 may prevent moisture or foreign particles from penetrating into the flexible printed circuit board 200.

[0079] The covering resin 232 may overlap at least a portion of the circuit pattern 212 and the protruding portion 222 of the cover layer 220. The covering resin 232 may contact the side surface of the anisotropic conductive film 231 while covering the exposed circuit pattern 212. The covering resin 232 covers a portion of the circuit pattern 212 that is not covered by the cover layer 220. In addition, the covering resin 232 is also disposed between adjacent protruding portions 222. An end portion of the covering resin 232 according to an exemplary embodiment may be aligned with an end portion of the body portion 221. That is, the covering resin 232 may completely cover an area exposed by the cover layer 220.

[0080] The covering resin 232 may include not only plastic resin but also any material among organic materials and inorganic materials. The covering resin 232 may be provided by various methods and may be formed by dropping and applying a solution onto the base film 210 and curing the solution.

[0081] In this case, the solution for forming the covering resin 232 may be dripped between adjacent protruding portions 222. Alternatively, according to an exemplary embodiment, the solution for forming the covering resin 232 may be dripped on the protruding portions 222. Therefore, the solution may be uniformly provided even between adjacent protruding portions 222. The flexible printed circuit board 200 according to the exemplary embodiment may include the uniformly formed covering resin 232 without having an exposed portion. The flexible printed circuit board 200 may effectively block moisture or foreign particles, thereby increasing the reliability of the device.

[0082] In the following, reference will be made to Figure 7 A flexible printed circuit board according to an exemplary embodiment is described. Figure 7 2 is a cross-sectional view of some constituent elements of a flexible printed circuit board according to an exemplary embodiment. Description of constituent elements similar to those described above will be omitted.

[0083] Reference Figure 7 , in the flexible printed circuit board 200 according to the exemplary embodiment, the covering resin 232 may overlap the covering layer 220 . Specifically, the covering resin 232 may overlap not only the protrusion portion 222 but also the body portion 221 .

[0084] In the process of applying the solution for forming the covering resin 232, the solution may be disposed between adjacent protruding portions 222 or on the protruding portions 222. In this case, the solution remains on the protruding portions 222 and may also overlap with the main body portion 221. The covering resin 232 formed by the curing process of the solution may overlap with at least a portion of the main body portion 221 and the protruding portions 222. The covering resin 232 overlaps with at least a portion of the main body portion 221, thereby making it possible to more stably prevent the penetration of moisture or foreign particles.

[0085] In the following, reference is made to Figure 8 , an exemplary embodiment in which a touch pad is attached to a flexible printed circuit board will be described. Figure 8 is a cross-sectional view of a configuration in which a touch pad is attached to a flexible printed circuit board according to an exemplary embodiment. Descriptions of constituent elements similar to those described above will be omitted.

[0086] The flexible printed circuit board 200 according to the exemplary embodiment may be connected to the pad portion PP1 through the anisotropic conductive film 231 same as the above-described anisotropic conductive film 231. The pad portion PP1 may include an electrode for transmitting a signal to the display panel or an electrode for receiving a signal at the touch panel.

[0087] The pad portion PP1 may contact the anisotropic conductive film 231 , and may be electrically connected to the electrode pad 211 of the flexible printed circuit board 200 through the anisotropic conductive film 231 .

[0088] The covering resin 232 according to the exemplary embodiment may cover not only the exposed portion of the circuit pattern 212 but also the exposed side surface of the anisotropic conductive film 231 and the side portion of the pad portion PP1. The covering resin 232 covers not only the circuit pattern 212 but also the side surfaces of the anisotropic conductive film 231 and the pad portion PP1, thereby preventing the penetration of moisture or foreign particles.

[0089] Hereinafter, a flexible printed circuit board according to a comparative example will be described. Fig. 9 A specific area of ​​a display device according to a comparative example is shown. The constituent elements denoted by each reference numeral are the same as the constituent elements described above.

[0090] When the solution is applied to form the covering resin 232 according to the comparative example, an empty space may be formed between the locations where the solution is dropped. Fig. 9As shown in , the solution may not be located between the dropping points. In this case, the covering resin 232 may have protrusions and depressions on the plane, and a portion of the circuit pattern 212 not covered by the covering resin 232 may be exposed to moisture or foreign particles.

[0091] However, the flexible printed circuit board according to the exemplary embodiment includes a covering layer having a protruding portion. In this case, the solution for forming the covering resin 232 can be dripped between adjacent protruding portions or dripped on the protruding portions, so that the solution can be uniformly applied. The covering resin 232 formed by the solution having excellent ductility can be arranged in a uniform form without exposing the circuit pattern 212, and moisture or foreign particles can be prevented from penetrating into the flexible printed circuit board.

[0092] Although specific exemplary embodiments and implementations have been described herein, other embodiments and modifications will be apparent from this description. Therefore, the inventive concept is not limited to these embodiments, but is limited to the broader scope of the appended claims and various obvious modifications and equivalent arrangements as will be apparent to those of ordinary skill in the art.

Claims

1. A display device, comprising: A display panel including a display area and a non-display area; as well as a flexible printed circuit board connected to the display panel in the non-display area; in: The flexible printed circuit board comprises: Basic membrane; An electrode pad disposed on one side of the base film; A circuit pattern connected to the electrode pad; a cover layer overlapping at least a portion of the circuit pattern; and a covering resin disposed on and covering at least a portion of the covering layer and at least a portion of the circuit pattern; as well as The cover layer includes a main body portion and a protruding portion protruding from the main body portion.

2. The display device according to claim 1, wherein: The covering resin overlaps the protruding portion.

3. The display device according to claim 1, wherein: The covering resin overlaps at least a portion of the main body portion.

4. The display device according to claim 1, wherein: At least a portion of the circuit pattern overlaps the protruding portion.

5. The display device according to claim 1, wherein: The covering layer includes a plurality of the protruding portions, and Wherein, the plurality of protruding portions are arranged apart from each other at regular intervals.

6. The display device according to claim 1, wherein: The display panel includes a pad portion located in the non-display area, and the pad portion is electrically connected to the electrode pad, and Wherein, the display device further includes an anisotropic conductive film located between the pad portion and the electrode pad.

7. The display device according to claim 6, wherein: The anisotropic conductive film and the electrode pad are spaced apart from the cover resin in a plane.

8. The display device according to claim 6, wherein: The anisotropic conductive film and the electrode pad are spaced apart from the cover layer on a plane.

9. The display device according to claim 1, wherein: The display device further includes a touch panel, wherein the touch panel includes a touch area and a peripheral area; as well as Wherein, the flexible printed circuit board is coupled to the touch panel in the peripheral area.

10. The display device according to claim 9, wherein: The touch panel includes a pad portion located in the peripheral area, and the pad portion is electrically connected to the electrode pad, and Wherein, the display device further includes an anisotropic conductive film arranged between the pad portion and the electrode pad.

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