Display Devices

Abstract

The present invention discloses a display device. The display device includes: a display panel configured to display images and sense touch; a first flexible printed circuit film bonded to one edge of the display panel; a second flexible printed circuit film bonded to the other edge of the display panel; and a printed circuit board, the first flexible printed circuit film and the second flexible printed circuit film bonded or connected to the printed circuit board, wherein the second flexible printed circuit film includes a main part and a tail extending from the main part, and the tail includes a first part and a second part, the first part extends from the main part in a first direction, and the second part extends from the first part in a second direction different from the first direction.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2018-0011267, filed on January 30, 2018, 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 display device, and more particularly to a display device having a structure providing an efficient test. Background Art

[0004] Display devices such as organic light emitting diode displays and liquid crystal displays include a display panel having a screen for displaying images. In addition to the image display function, the display panel may have a touch sensing function to provide a user interaction platform.

[0005] The display device may include a flexible printed circuit film for transmitting a signal to display an image on a display panel (hereinafter referred to as a "flexible printed circuit film for display") and a flexible printed circuit film for transmitting a signal for sensing a touch (hereinafter referred to as a "flexible printed circuit film for touch"). One end of each of the flexible printed circuit films may be coupled to the display panel, and the other end of the flexible printed circuit film may be coupled or connected to a printed circuit board (PCB). The flexible printed circuit film may receive various signals through the printed circuit board (PCB).

[0006] After the flexible printed circuit film is bonded, most of the flexible printed circuit film can be bent to be placed on the rear surface of the display panel together with the printed circuit board. In this case, since the flexible printed circuit film for touch is connected to the printed circuit board, it may be difficult to bend the flexible printed circuit film for touch. In this way, when testing the display device before shipment to check its operation, etc., the test is performed when the flexible printed circuit film for touch is disconnected from the printed circuit board, for example, by connecting both the printed circuit board and the flexible printed circuit film for touch to the test equipment. However, this process may increase the test time and reduce the test efficiency.

[0007] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present inventive concept and therefore it may contain information that does not constitute prior art. Summary of the invention

[0008] The apparatus constructed according to the exemplary embodiments of the present invention can provide a simple test environment and reduce the occurrence of defects.

[0009] 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.

[0010] A display device according to an exemplary embodiment includes: a display panel configured to display an image and sense a touch; a first flexible printed circuit film bonded to one edge of the display panel; a second flexible printed circuit film bonded to the other edge of the display panel; and a printed circuit board, the first flexible printed circuit film and the second flexible printed circuit film being bonded or connected to the printed circuit board, wherein the second flexible printed circuit film includes a main portion and a tail portion extending from the main portion, and the tail portion includes a first portion and a second portion, the first portion extending from the main portion in a first direction, and the second portion extending from the first portion in a second direction different from the first direction.

[0011] The main portion may include a body portion on which the touch driver is mounted, a pad portion coupled to the display panel, and a first bent portion disposed between the body portion and the pad portion, and the first portion of the tail portion may extend from the pad portion.

[0012] The printed circuit board and the body portion may be configured to be placed on a rear surface of the display panel, and the first portion of the tail portion may be placed on a front surface of the display panel.

[0013] When the printed circuit board and the body portion are placed on the rear surface of the display panel, the second portion of the tail portion may be placed on the front surface of the display panel.

[0014] The tail portion may further include a third portion extending from the second portion in the first direction, the third portion including a second bent portion.

[0015] When the printed circuit board and the body portion are placed on the rear surface of the display panel, the third portion may include a first component and a second component, the first component being configured to be placed on the front surface of the display panel and the second component being configured to be placed on the rear surface of the display panel.

[0016] The tail portion may further include a first connection portion at an end of the third portion, and the first connection portion may be connected to a second connection portion disposed on the printed circuit board.

[0017] The printed circuit board and the main body portion are configured to be placed on a rear surface of the display panel; and

[0018] When the printed circuit board and the main body are placed on the rear surface of the display panel, the first portion of the tail may include a bent portion, a first component and a second component, the first component being configured to be placed on the front surface of the display panel and the second component being configured to be placed on the rear surface of the display panel.

[0019] When the printed circuit board and the body portion are placed on the rear surface of the display panel, the second portion of the tail portion may be placed on the rear surface of the display panel.

[0020] The main portion may include a body portion on which the touch driver is mounted, a pad portion coupled to the display panel, and a first bent portion disposed between the body portion and the pad portion, and the first portion of the tail may extend from the body portion.

[0021] The printed circuit board, the body portion, and the first portion of the tail portion may be configured to be placed on a rear surface of the display panel.

[0022] When the printed circuit board and the main body are placed on the rear surface of the display panel, the first portion of the tail may include a second bent portion, a first component and a second component, the first component being configured to be placed on the front surface of the display panel and the second component being configured to be placed on the rear surface of the display panel.

[0023] The tail portion may further include a third portion extending from the second portion in the first direction, and when the printed circuit board and the main body portion are placed on the rear surface of the display panel, the third portion of the tail portion may include a third bent portion, a first component of the third portion, and a second component of the third portion, the first component of the third portion being configured to be placed on the front surface of the display panel, and the second component of the third portion being configured to be placed on the rear surface of the display panel.

[0024] The display panel may include a first substrate and a second substrate arranged on the first substrate, and a first flexible printed circuit film for display may be bonded to a first pad portion arranged on the first substrate, and a second flexible printed circuit film may be bonded to a second pad portion arranged on the second substrate.

[0025] According to another exemplary embodiment, a display device includes: a display panel including a first substrate and a second substrate arranged on the first substrate; a first flexible printed circuit film bonded to the first substrate at one edge of the display panel; and a second flexible printed circuit film bonded to the second substrate at another edge of the display panel, wherein the second flexible printed circuit film includes a main portion and a tail portion, the main portion includes a pad portion bonded to the first substrate, and the tail portion includes a first portion, the first portion extending substantially parallel to a length direction of the pad portion.

[0026] The tail portion may include at least one curved portion.

[0027] The main portion may further include a body portion on which the touch driver is mounted and a bent portion disposed between the pad portion and the body portion, and the first portion of the tail portion may extend from the pad portion.

[0028] The body portion may be configured to be disposed on a rear surface of the display panel, and at least some of the first portion of the tail portion may be configured to be placed on a front surface of the display panel.

[0029] The main portion may further include a body portion on which the touch driver is mounted and a bent portion disposed between the pad portion and the body portion, and the first portion of the tail portion may extend from the body portion.

[0030] The display device may further include a printed circuit board, the first flexible printed circuit film is coupled to the printed circuit board, and the second flexible printed circuit film for touch is connected to the printed circuit board.

[0031] 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

[0032] 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.

[0033] Figure 1 is a front view of a display device according to an exemplary embodiment.

[0034] Figure 2 yes Figure 1 An enlarged view of a flexible printed circuit film for touch of a display device.

[0035] Figure 3 and Figure 4 According to exemplary embodiments Figure 1 The front view and rear view of the display device.

[0036] Figure 5 is along Figure 3 A cross-sectional view taken along line V-V'.

[0037] Figure 6 is a front view of a display device according to an exemplary embodiment.

[0038] Figure 7 and Figure 8 According to exemplary embodiments Figure 6 The front view and rear view of the display device.

[0039] Fig. 9 is a front view of a display device according to an exemplary embodiment.

[0040] Fig.10 and Fig.11 According to exemplary embodiments Fig. 9 The front view and rear view of the display device.

[0041] Fig.12 is a cross-sectional view of a display device according to an exemplary embodiment. DETAILED DESCRIPTION

[0042] In the following description, for the purpose of illustration, many specific details are set forth to provide a comprehensive understanding of each exemplary embodiment or implementation of the present invention. As used herein, "embodiment" and "implementation" are interchangeable words for non-limiting examples of devices or methods using one or more inventive concepts disclosed herein. However, it is to be understood that each exemplary embodiment can be practiced without these specific details or under the conditions of one or more equivalent arrangements. In other cases, well-known structures and devices are shown in the form of block diagrams to avoid unnecessary obscurity of each exemplary embodiment. In addition, each exemplary embodiment may be different, but not necessarily exclusive. For example, the specific shape, configuration and characteristics of an exemplary embodiment may be used or implemented in another exemplary embodiment without departing from the present invention.

[0043] Unless otherwise indicated, the illustrated exemplary embodiments 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 indicated, the features, components, modules, layers, films, panels, regions and / or aspects of the various embodiments (hereinafter referred to as "elements" respectively or collectively) can be combined, separated, interchanged and / or rearranged without departing from the inventive concept.

[0044] The use of cross hatching and / or shading in the drawings is generally provided to make the boundaries between adjacent elements clear. Therefore, unless 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. for the element. In addition, in the drawings, the size and relative size of the elements may be exaggerated for clarity and / or description purposes. When the exemplary embodiments can be implemented differently, the specific process sequence may be performed differently from the described sequence. For example, two processes described in succession may be performed substantially simultaneously, or in an order opposite to the described sequence. In addition, the same reference numerals represent the same elements.

[0045] When an element such as a layer is referred to as being "located on another element or layer", "connected to" or "coupled to" another element or layer, the element may be directly located on, directly connected to or coupled to, another element or layer, or there may be an intermediate 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 intermediate element or layer. For this reason, the term "connection" may refer to a physical connection, an electrical connection and / or a fluid connection using or not using an intermediate element. In addition, the D1 axis, the D2 axis and the D3 axis are not limited to the three axes of a rectangular coordinate system (such as, the x-axis, the y-axis and the z-axis), but may be interpreted in a broader sense. For example, the D1 axis, the D2 axis and the D3 axis may be mutually perpendicular, or may represent different directions that are not mutually perpendicular. 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.

[0046] 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. Therefore, the first element introduced below can be referred to as the second element without departing from the teachings of the present disclosure.

[0047] For descriptive purposes, spatially relative terms such as "below," "beneath," "under," "down," "above," "up," "above," "higher," "side" (e.g., as in "sidewall"), etc. may be used herein and thereby describe the relationship of one element illustrated in the accompanying drawings to another element. Spatially relative terms are intended to encompass different orientations of the device when in use, in operation, and / or in manufacture other than the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "below" or "below" other elements or features would then be "above" the other elements or features. Thus, the exemplary term "below" can include both above and below orientations. Moreover, the device can be oriented in other directions (e.g., rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0048] The terms used herein are for the purpose of describing specific embodiments and are not intended to be limiting. As used herein, the singular forms of "a" and "the" are intended to also include plural forms, unless the context clearly indicates otherwise. In addition, the terms "include" and / or "comprise", when used in this specification, specify the existence of the described features, integral bodies, steps, operations, elements, parts and / or their groups, but do not exclude the existence or increase of one or more other features, integral bodies, steps, operations, elements, parts 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 and are not used as terms of degree, and are therefore used to consider the inherent deviations in the values ​​that will be recognized by those skilled in the art for measurement, calculation and / or provision.

[0049] A display device according to an exemplary embodiment will be described with reference to the accompanying drawings. Hereinafter, the display device will be described as an organic light emitting diode display, however, the inventive concept is not limited thereto and the display device may be applied to other display devices such as a liquid crystal display.

[0050] Figure 1 is a front view of a display device according to an exemplary embodiment. Figure 2 yes Figure 1 FIG. 1 is an enlarged view of a flexible printed circuit film 200 for a touch display device.

[0051] refer to Figure 1 , a display device according to an exemplary embodiment includes a display panel 10 , a flexible printed circuit film 100 for display coupled to the display panel 10 , a flexible printed circuit film 200 for touch, and a printed circuit board (PCB) 300 . Figure 1 A state is illustrated in which the flexible printed circuit film 100 for display and the flexible printed circuit film 200 for touch are combined or connected to the display panel 10 and the printed circuit board 300 .

[0052] The display panel 10 can display images and sense touch. As used herein, "flexible printed circuit film for display" may refer to a flexible printed circuit film for transmitting signals to display images on the display panel, and "flexible printed circuit film for touch" may refer to a flexible printed circuit film for transmitting signals for sensing touch.

[0053] The display panel 10 includes a display area DA corresponding to a screen for displaying an image and a non-display area NA, in which elements and / or wirings for generating and / or transmitting various signals applied to the display area DA are formed. Figure 1As shown, the display area DA may be within the boundary line indicated by the single-point dashed line, and the non-display area NA may be outside the boundary line. The size of the touch area TA capable of sensing touch may be substantially the same as the size of the display area DA. In the display area DA and the touch area TA, the pixels PX and the touch electrodes TE are arranged, for example, in a matrix form. The pixels PX may display an image, and the touch electrodes TE may sense a user's touch or non-touch. The display panel 10 may be referred to as a touch screen panel.

[0054] The display panel 10 includes a first substrate 11 and a second substrate 12. The first substrate 11 and the second substrate 12 may be bonded to each other by a sealant or the like. When the display device is an organic light emitting diode (OLED) display, the second substrate 12 may be an encapsulation substrate that can prevent moisture and / or oxygen from penetrating from the outside. A display active layer including pixels PX and wiring connected to the pixels PX is arranged between the first substrate 11 and the second substrate 12. A touch sensing layer including touch electrodes TE and wiring connected to the touch electrodes TE is arranged on the second substrate 12. The touch sensing layer may be arranged between the first substrate 11 and the second substrate 12.

[0055] A pad portion DP (hereinafter referred to as a "pad portion for display") is provided on the first substrate 11 of the display panel 10, and a signal for operating and controlling the pixel PX is provided to the pad portion DP. A flexible printed circuit film 100 for display is bonded to each pad portion DP for display. During bonding, an anisotropic conductive film (ACF) may be used for electrical connection and physical coupling between the flexible printed circuit film 100 for display and the pad portion DP for display. The anisotropic conductive film may be a film having an insulating layer such as a resin, in which conductive particles are distributed. Figure 1 Four flexible printed circuit films 100 for display are illustrated, however, the present inventive concept is not limited thereto, and the number of flexible printed circuit films 100 for display may vary.

[0056] A pad portion TP (hereinafter referred to as a "pad portion for touch") to which a signal for operating and controlling the touch electrode TE is supplied is disposed on the second substrate 12 of the display panel 10. A flexible printed circuit film 200 for touch is coupled to the pad portion TP for touch.

[0057] A display driver DD that generates a signal for driving the pixel PX is disposed on the first substrate 11. The display driver DD may be provided as an integrated circuit chip and may include a data driver. The display driver DD may be disposed on a flexible printed circuit film 100 for display. On the first substrate 11, a driving portion such as a scan driver and a light emitting driver may be integrated in the left non-display area NA and / or the right non-display area NA of the display area DA.

[0058] A touch driver TD for generating a signal for driving the touch electrode TE and processing a signal received from the touch electrode TE is disposed on the flexible printed circuit film 200 for touch. The touch driver TD may be provided as an integrated circuit chip.

[0059] In a plan view, three edges (upper side, left side and right side in the xy plane) of the first substrate 11 may be substantially consistent with three edges of the second substrate 12, but the first substrate 11 may be formed to be larger than the second substrate 12 in an area (e.g., a lower edge area), and a pad portion DP for display is arranged on the area so as to be combined with the flexible printed circuit film 100 for display.

[0060] The flexible printed circuit film 100 for display is bonded to the first substrate 11 at the lower edge portion of the display panel 10, and the flexible printed circuit film 200 for touch is bonded to the second substrate 12 at the lateral edge portion of the display panel 10. In this case, compared with the case where the flexible printed circuit film 200 for touch is bonded to the lower edge portion of the display panel 10 (the flexible printed circuit film 100 for display is also bonded to the lower edge portion of the display panel 10), the bezel width (corresponding to the front width of the electronic device around the screen) of the lower portion of the electronic device such as a tablet computer including the display device can be reduced.

[0061] exist Figure 1 In the embodiment, the flexible printed circuit film 200 for touch is bonded to the left edge portion of the display panel 10. However, the flexible printed circuit film 200 for touch may be bonded to the right edge portion of the display panel 10. In this case, the flexible printed circuit film 200 for touch may have a thickness relative to Figure 1 The central axis of the display panel 10 in the y direction is Figure 1 The flexible printed circuit film 200 for touch has a substantially symmetrical structure. The printed circuit board 300 may be arranged at the long side of the display panel 10, and the flexible printed circuit film 200 for touch may be placed as shown in FIG. Figure 1 At the short sides of the display panel 10 shown, and vice versa.

[0062] The flexible printed circuit film 100 for display includes a bent portion BP, which is a portion that can be mainly bent when the printed circuit board 300 is bent to be placed on the rear surface of the display panel 10 (ie, the opposite surface of the screen).

[0063] A signal controller SC generating a signal for controlling a display driver DD is arranged on the printed circuit board 300. The signal controller SC may generate a signal for controlling a touch driver TD. The signal controller SC may include a timing controller. The printed circuit board 300 is provided with an input portion 310 for receiving signals and power from the outside. A pad portion is placed on the printed circuit board 300, and a flexible printed circuit film 100 for display is bonded to the pad portion. The printed circuit board 300 includes a connection portion 320, and a flexible printed circuit film 200 for touch may be connected to the connection portion 320.

[0064] Now it will be with Figure 1 Reference together Figure 2 The flexible printed circuit film 200 for touch is described in detail. The flexible printed circuit film 200 for touch includes a main portion 210 having a large width and a tail portion 220 having a relatively narrow width. The touch driver TD is arranged on the main portion 210, and the tail portion 220 is connected to the printed circuit board 300. The main portion 210 includes a body portion 211, a pad portion PP, and a bent portion BPa. The body portion 211 is a portion on which the touch driver TD is mounted, the pad portion PP is a portion of the pad portion TP for touch coupled to the second substrate 12, and the bent portion BPa is a portion that is mainly bent when the body portion 211 is bent to be placed on the rear surface of the display panel 10.

[0065] The tail portion 220 may extend from the pad portion PP of the main portion 210. The tail portion 220 may have a structure that is bent twice in an unfolded state, such as Figure 2 More specifically, the tail portion 220 includes a first portion 221 extending from the pad portion PP in a downward direction, a second portion 222 extending from the first portion 221 in a rightward direction, and a third portion 223 extending from the second portion 222 in a downward direction. When the flexible printed circuit film 200 for touch is arranged on the right side of the display panel 10, the second portion 222 may extend from the first portion 221 in a leftward direction.

[0066] The first portion 221 and the third portion 223 may extend in a direction (y direction or first direction) substantially parallel to the length direction of the pad portion PP, and the second portion 222 may extend in a direction (x direction or second direction) substantially perpendicular to the length direction of the pad portion PP. At least some of the first portion 221 may overlap with the non-display area NA of the display panel 10. Most or all of the second portion 222 may overlap with the non-display area NA of the display panel 10. The third portion 223 includes a portion overlapping with the non-display area NA, a portion overlapping with the printed circuit board 300, and a bent portion BPb disposed between the two portions. All portions of the tail portion 220 may be bent, but the bent portion BPb may be a portion that is mainly bent when the printed circuit board 300 is bent to be placed on the rear surface of the display panel 10. The bent portion BPb may overlap with the bent portion BP of the flexible printed circuit film 100 for display.

[0067] In the flexible printed circuit film 200 for touch, the body portion 211 of the main portion 210 may be thicker than other portions. For example, the body portion 211 may be formed of three or more layers, and the bending portion BPa, the pad portion PP and the tail portion 220 may be formed of two or less layers.

[0068] Tail 220 includes a connection portion 230 at one end of the third portion 223. Connection portion 230 is a portion connected to connection portion 320 of printed circuit board 300. Connection portion 230 and connection portion 320 can form a board-to-board (BTB) connector. Alternatively, connection portion 230 and connection portion 320 can form a zero insertion force (ZIF) connector. For example, connection portion 320 can be a ZIF socket, and connection portion 230 can be a portion inserted into the ZIF socket. In addition, various connection methods for electrically connecting and physically connecting connection portion 230 and connection portion 320 well-known in the art can be used.

[0069] like Figure 1As shown, the flexible printed circuit film 100 for display is bonded to the display panel 10 and to the printed circuit board 300, and the flexible printed circuit film 200 for touch is bonded to the display panel 10 and connected to the printed circuit board 300. Therefore, when testing the display device, the test device can be connected only to the input part 310 of the printed circuit board 300 for test. If the test process is performed when the flexible printed circuit film 200 for touch is not connected to the printed circuit board 300, it will be necessary to connect the test device to the connection part 230 of the flexible printed circuit film 200 for touch and to the input part 310 of the printed circuit board 300. According to an exemplary embodiment, when the test device is connected to only one part (e.g., the input part 310) of the display device, the test time can be shortened and the test process can be easily automated.

[0070] Figure 3 and Figure 4 It shows respectively when Figure 1 When the main body portion 211 of the flexible printed circuit film 200 for touch and the printed circuit board 300 are placed on the rear surface of the display panel 10, a front view and a rear view of the display device are shown. Figure 5 is along Figure 3 The cross-sectional view is taken along the line V-V'. Figures 3 to 5 The display device shown is Figure 1 The display devices shown are essentially the same, but Figures 3 to 5 The display device shown comprises a window 40 .

[0071] In the display device included in the electronic device, the bent portion BP of the flexible printed circuit film 100 for display and the bent portions BPa and BPb of the flexible printed circuit film 200 for touch are bent so that the printed circuit board 300 and the main body portion 211 can be bent to be placed on the rear surface of the display panel 10, as shown in FIG. Figures 3 to 5 Specifically, the bent portion BP of the flexible printed circuit film 100 for display and the bent portion BPb of the tail portion 220 of the flexible printed circuit film 200 for touch are bent at the lower portion of the display panel 10. The bent portion BPa of the main portion 210 of the flexible printed circuit film 200 for touch is bent at the side portion of the display panel 10.

[0072] When the connection portion 230 of the flexible printed circuit film 200 for touch is connected to the connection portion 320 of the printed circuit board 300, such bending can be simply performed by bending the printed circuit board 300 backward to the rear surface of the display panel 10, and bending the main body portion 211 of the flexible printed circuit film 200 for touch backward to the rear surface of the display panel 10. In order to fix the positions of the printed circuit board 300 and the flexible printed circuit film 200 for touch, the printed circuit board 300 and the flexible printed circuit film 200 for touch may be attached to the rear surface of the display panel 10. In this way, by placing the printed circuit board 300 and the main body portion 211 of the flexible printed circuit film 200 for touch on the rear surface of the display panel 10, the portion protruding from the display panel 10 can be minimized (or substantially reduced). Therefore, in addition to improving the space utility of the electronic device, the width of the frame of the electronic device (e.g., a tablet computer) including the display device can also be reduced.

[0073] When the bent portions BPa and BPb of the flexible printed circuit film 200 for touch are bent, the pad portion PP, the entire first portion 221 and the second portion 222 of the tail portion 220, and some of the third portion 223 of the tail portion 220 (e.g., the upper portion of the bent portion BPb) may be placed on the front surface of the display panel 10. The body portion 211, the connection portion 230, and some of the third portion 223 of the tail portion 220 (a portion between the bent portion BPb and the connection portion 230) may be placed on the rear surface of the display panel 10. Figure 3 As shown, since the tail portion 220 hardly protrudes from the display panel 10 (for example, since the first portion 221 protrudes to a similar extent as the pad portion PP, the second portion 222 is located in the area of ​​the display panel 10, and the third portion 223 protrudes to a similar extent as the flexible printed circuit film 100 for display), the dead space caused by the tail portion 220 does not increase or hardly increases.

[0074] Due to the structure of the tail portion 220 of the flexible printed circuit film 200 for touch, the connection portion 230 of the flexible printed circuit film 200 for touch may not need to be separated from the connection portion 320 of the printed circuit board 300 to place the printed circuit board 300 and the body portion 211 on the rear surface of the display panel 10. Since the test is performed while the flexible printed circuit film 200 for touch is connected to the printed circuit board 300, the flexible printed circuit film 200 for touch does not need to be separated from the printed circuit board 300 after the test is performed.

[0075] In addition, by expanding Figure 1The bent portion BP of the flexible printed circuit film 100 for display and the bent portions BPa and BPb of the flexible printed circuit film 200 for touch shown can even easily perform a process of attaching or replacing a digitizer, a buffer sheet, an insulating sheet, etc. to the rear surface of the display panel 10, wherein the connection portion 230 of the flexible printed circuit film 200 for touch is connected to the connection portion 320 of the printed circuit board 300. Even if the connection portion 230 and the connection portion 320 are connectors that can be disconnected or reconnected, when the connection portion 230 and the connection portion 320 are disconnected or reconnected, the wiring and terminals of the connection portion 230 and the connection portion 320 may be damaged, which may cause defects. Therefore, maintaining the original connection state of the connection portion 230 and the connection portion 320 can enhance the working reliability or product reliability.

[0076] Figure 5 is a schematic cross-sectional structure of a display device according to an exemplary embodiment. The display device according to the illustrated exemplary embodiment includes Figures 1 to 3 The elements of the display device of the embodiment are substantially the same as the elements of the display device, and therefore, the detailed description of the substantially the same elements will be omitted to avoid redundancy. Figure 5 The display device further includes a polarizing layer 20 arranged on the second substrate 12 of the display panel 10. In an organic light emitting diode display, the polarizing layer 20 can reduce external light reflection. The window 40 can be arranged on the polarizing layer 20, and the adhesive layer 30 for bonding the polarizing layer 20 and the window 40 can be arranged between the polarizing layer 20 and the window 40. The window 40 can protect the display panel 10, the polarizing layer 20, etc. from damage by external impact, etc. The window 40 can be formed of a transparent and rigid material such as glass or plastic. At least one functional sheet 50 for buffering, heat dissipation, light shielding, insulation, etc. can be arranged under the first substrate 11 of the display panel 10. The bent portion BP of the flexible printed circuit film 100 for display and the bent portion BPb of the tail 220 of the flexible printed circuit film 200 for touch can be bent so that the printed circuit board 300 and the connection portion 230 of the flexible printed circuit film 200 for touch connected to the printed circuit board 300 can be placed on the rear surface of the display panel 10.

[0077] The following will focus on the above reference Figure 1 to Figure 2 Difference in Structure of Tail Portion 220 of Flexible Printed Circuit Film 200 Described The structure of the tail portion 220 of the flexible printed circuit film 200 for touch according to the exemplary embodiment is described.

[0078] Figure 6 A front view of a display device according to an exemplary embodiment is illustrated. Figure 7 and Figure 8 When Figure 6When the main body portion 211 of the flexible printed circuit film 200 for touch and the printed circuit board 300 are placed on the rear surface of the display panel 10, a front view and a rear view of the display device are shown. Figures 6 to 8 A portion of a display device (corresponding to Figure 1 of the lower left part).

[0079] refer to Figure 6 , the flexible printed circuit film 200 for touch includes a main part 210 and a tail part 220. The main part 210 includes a main body part 211, a pad part PP, and a bent part BPa, the touch driver TD is mounted on the main body part 211, the pad part PP is coupled to the display panel 10, and the bent part BPa is located between the main body part 211 and the pad part PP. The tail part 220 extends from the main body part 211, not from the pad part PP of the main part 210. More specifically, the tail part 220 includes a first part 221, a second part 222, a third part 223, and a connecting part 230, the first part 221 extends from the main body part 211 in a downward direction, the second part 222 extends from the first part 221 in a right direction, and the third part 223 extends from the second part 222 in a downward direction. Therefore, the first part 221 is placed farther away from the display panel 10 than the bent part BPa. The third portion 223 includes a bent portion BPb2, and the second portion 222 includes a bent portion BPb1. When the flexible printed circuit film 200 for touch is bent to be placed on the rear surface of the display panel 10, the bent portion BPb1 may be mainly bent, and when the printed circuit board 300 is bent to be placed on the rear surface of the display panel 10, the bent portion BPb2 may be mainly bent.

[0080] refer to Figure 7 and Figure 8 , the bent portion BP of the flexible printed circuit film 100 for display and the bent portions BPa, BPb1, and BPb2 of the flexible printed circuit film 200 for touch are bent so that the printed circuit board 300 and the main body portion 211 are placed on the rear surface of the display panel 10. The first portion 221 of the tail 220 of the flexible printed circuit film 200 for touch may be placed on the rear surface of the display panel 10 together with the main body portion 211. Most of the second portion 222 of the tail 220 is placed on the front surface of the display panel 10, and a small portion of the second portion 222 of the tail 220 is placed on the rear surface of the display panel 10. Some of the third portion 223 of the tail 220 is placed on the front surface of the display panel 10, and some other portions of the third portion 223 of the tail 220 are placed on the rear surface of the display panel 10.

[0081] Similar to the above exemplary embodiment, the flexible printed circuit film 200 for touch can be connected to the connection portion 320 of the printed circuit board 300 together with the flexible printed circuit film 100 for display as shown in FIG. Figure 6 , or it can be expanded as Figure 7 and Figure 8 Since the tail portion 220 hardly protrudes from the display panel 10 (eg, since the second portion 222 protrudes to a similar extent as the bent portion BPa), the dead space caused by the tail portion 220 does not increase or hardly increases.

[0082] Fig. 9 is a front view of a display device according to an exemplary embodiment. Fig.10 and Fig.11 When Fig. 9 When the main body 211 of the flexible printed circuit film 200 for touch and the printed circuit board 300 are placed on the rear surface of the display panel 10, a front view and a rear view of the display device are shown. Figures 6 to 8 similar, Figures 9 to 11 A portion of a display device is illustrated.

[0083] refer to Fig. 9 , the flexible printed circuit film 200 for touch includes a main part 210 and a tail 220. The tail 220 may extend from the pad part PP of the main part 210 and may have a single curved structure in a plan view. Specifically, the tail 220 includes a first part 221, a second part 222, and a connecting part 230, the first part 221 extending from the pad part PP in a downward direction, and the second part 222 extending from the first part 221 in a rightward direction. The first part 221 extends substantially in a downward direction through the lower edge of the display panel 10 to the printed circuit board 300, so that the first part 221 may include a curved portion BPb, which may be bent together with the curved portion BP of the flexible printed circuit film 100 for display. When the printed circuit board 300 is bent to be placed on the rear surface of the display panel 10, the curved portion BPb may be mainly bent.

[0084] refer to Figures 9 to 11 , the bent portion BP of the flexible printed circuit film 100 for display and the bent portions BPa and BPb of the flexible printed circuit film 200 for touch may be bent so that the printed circuit board 300 and the main body portion 211 are placed on the rear surface of the display panel 10. Some of the first portion 221 of the tail portion 220 of the flexible printed circuit film 200 for touch is placed on the front surface of the display panel 10, and some other portions of the first portion 221 are placed on the rear surface of the display panel 10. The second portion 222 of the tail portion 220 is placed on the rear surface of the display panel 10.

[0085] The flexible printed circuit film 200 for touch may be connected to the connection portion 320 of the printed circuit board 300 together with the flexible printed circuit film 100 for display as shown in FIG. Fig. 9 , or it can be expanded as Fig.10 and Fig.11 Since the tail portion 220 hardly protrudes from the display panel 10 (eg, since the first portion 221 protrudes to a similar extent as the pad portion PP and the bent portion BP), a dead space caused by the tail portion 220 does not increase or hardly increases.

[0086] In addition to the above exemplary embodiments, the tail portion 220 of the flexible printed circuit film 200 for touch may be variously changed. For example, Fig. 9 The first portion 221 shown may be Figure 6 As shown, the tail portion 220 extends from the main body portion 211 in a downward direction. In this case, since the first portion 221 can be placed farther away from the display panel 10 than the bent portion BPa, the second portion 222 of the tail portion 220 can also include a bent portion to be bent together with the bent portion BPa. In addition, the tail portion 220 can be variously changed in the area overlapping with the printed circuit board 300. For example, the tail portion 220 can be further bent according to the connection direction of the connecting portion 320.

[0087] The following will refer to Fig.12 A cross-sectional structure of a display device according to an exemplary embodiment is described in more detail.

[0088] Fig.12 is a cross-sectional view of a stack structure of a display panel 10 in a display device according to an exemplary embodiment. Fig.12 The cross section shown substantially corresponds to one pixel area. The display device includes a display panel 10 and a polarizing layer 20, an adhesive layer 30, and a window 40 stacked on the display panel 10. The display panel 10 includes a first substrate 11, a transistor TR formed on the first substrate 11, an organic light emitting diode OLED connected to the transistor TR, and a second substrate 12 as an encapsulation substrate. The transistor TR and the organic light emitting diode OLED may form Figure 1 The pixel PX and display active layer described in FIG.

[0089] The first substrate 11 may be a rigid substrate made of glass, etc. The first substrate 11 may be a flexible substrate including a polymer such as polyimide, polyamide, polyethylene terephthalate, etc.

[0090] The buffer layer 120 is disposed on the first substrate 11. The buffer layer 120 may block impurities from diffusing from the first substrate 11 into the semiconductor layer 131 and reduce stress applied to the first substrate 11 in a process of forming the semiconductor layer 131.

[0091] The semiconductor layer 131 of the transistor TR is arranged on the buffer layer 120, and the gate insulating layer 140 is arranged on the semiconductor layer 131. The semiconductor layer 131 includes a source region, a drain region, and a channel region between the source region and the drain region. The semiconductor layer 131 may include polycrystalline silicon, an oxide semiconductor, or amorphous silicon. The gate insulating layer 140 may include an inorganic insulating material such as silicon oxide, silicon nitride, etc.

[0092] A gate conductor including a gate electrode 124 of the transistor TR is disposed on the gate insulating layer 140. The gate conductor may include a metal such as, for example, molybdenum (Mo), copper (Cu), aluminum (Al), silver (Ag), chromium (Cr), tantalum (Ta), and titanium (Ti), or a metal alloy thereof.

[0093] The interlayer insulating layer 160 is disposed on the gate conductor. The interlayer insulating layer 160 may include an inorganic insulating material and / or an organic insulating material.

[0094] A data conductor including a source electrode 173 and a drain electrode 175 of the transistor TR is disposed on the interlayer insulating layer 160. The source electrode 173 and the drain electrode 175 are respectively connected to a source region and a drain region of the semiconductor layer 131 through contact holes formed in the interlayer insulating layer 160 and the gate insulating layer 140. The data conductor may include a metal such as, for example, aluminum (Al), copper (Cu), silver (Ag), molybdenum (Mo), chromium (Cr), gold (Au), platinum (Pt), palladium (Pd), tantalum (Ta), tungsten (W), titanium (Ti), nickel (Ni), etc., or a metal alloy thereof.

[0095] The passivation layer 180 is disposed on the data conductor. The passivation layer 180 may include an organic insulating material. The pixel electrode PE is disposed on the passivation layer 180. The pixel electrode PE may be connected to the drain electrode 175 through a contact hole formed in the passivation layer 180 to receive a data signal for controlling the brightness of the organic light emitting diode OLED.

[0096] The pixel defining layer 360 is arranged on the passivation layer 180. The pixel defining layer 360 is provided with an opening overlapping with the pixel electrode PE. The emission layer EL is arranged on the pixel electrode PE in the opening of the pixel defining layer 360, and the common electrode CE is arranged on the emission layer EL. The pixel electrode PE, the emission layer EL and the common electrode CE form an organic light emitting diode OLED. The pixel electrode PE may be an anode of the organic light emitting diode OLED, and the common electrode CE may be a cathode of the organic light emitting diode OLED. The common electrode CE may include a transparent conductive material such as indium tin oxide (ITO) and indium zinc oxide (IZO).

[0097] The second substrate 12 for protecting the organic light emitting diode OLED is disposed on the common electrode CE. According to an exemplary embodiment, a thin film encapsulation layer may be disposed on the common electrode CE instead of the second substrate 12.

[0098] The touch sensor layer TSL is disposed on the second substrate 12. The touch sensor layer TSL may include a touch electrode formed using a transparent conductive material such as ITO and IZO, a metal mesh, etc., and the touch electrode may be formed in a single layer or a multi-layer.

[0099] A polarizing layer 20 for reducing external light reflection is disposed on the touch sensor layer TSL, and an adhesive layer 30 for attaching the window 40 is disposed on the polarizing layer 20. A protective film and / or a functional sheet for protecting the display panel 10 may be disposed under the first substrate 11.

[0100] Although the display device is described as an organic light emitting diode display, the inventive concept is not limited thereto, and the display device may be a liquid crystal display including, for example, a liquid crystal layer.

[0101] According to an exemplary embodiment, after testing the display device in a state where the flexible printed circuit film for touch is connected to the printed circuit board, it is not necessary to separate the flexible printed circuit film for touch from the printed circuit board so as to place the flexible printed circuit film for touch and the printed circuit board on the rear surface of the display panel. Therefore, it is possible to easily test the display device and prevent defects that may occur when the flexible printed circuit film for touch is separated.

[0102] Although specific exemplary embodiments and implementations have been described herein, other embodiments and modifications will be apparent from the description. Therefore, as will be apparent to one of ordinary skill in the art, 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.

Claims

1. A display device, include: a display panel configured to display an image and sense a touch, the display panel having a first side surface and a second side surface extending in directions crossing each other; a first flexible printed circuit film bonded to one edge of the display panel along the first side surface of the display panel; a second flexible printed circuit film bonded to another edge of the display panel and extending along the first side surface and the second side surface of the display panel; as well as a printed circuit board, the first flexible printed circuit film and the second flexible printed circuit film being bonded or connected to the printed circuit board, in: The second flexible printed circuit film includes a main portion and a tail portion extending from the main portion; The main part includes a body part on which a touch driver is installed, a pad part coupled to the display panel, and a first bent part arranged between the body part and the pad part; The tail portion includes a first portion and a second portion, the first portion extending from the main portion in a first direction, the second portion extending from the first portion in a second direction different from the first direction; and The first portion of the tail portion extends from the pad portion or the body portion.

2. The display device according to claim 1, in: The printed circuit board and the main body portion are configured to be placed on a rear surface of the display panel; and The first portion of the tail is placed on a front surface of the display panel.

3. The display device according to claim 2, in, When the printed circuit board and the main body portion are placed on the rear surface of the display panel, the second portion of the tail portion is placed on the front surface of the display panel.

4. The display device according to claim 2, in, The tail portion further includes a third portion extending from the second portion in the first direction, the third portion including a second bent portion.

5. The display device according to claim 4, in, When the printed circuit board and the main body are placed on the rear surface of the display panel, the third part includes a first component and a second component, the first component is configured to be placed on the front surface of the display panel, and the second component is configured to be placed on the rear surface of the display panel.

6. The display device according to claim 4, in: The tail further includes a first connecting portion at an end of the third portion; and The first connection portion is connected to a second connection portion arranged on the printed circuit board.

7. The display device according to claim 1, in: The printed circuit board and the main body portion are configured to be placed on a rear surface of the display panel; and When the printed circuit board and the main body are placed on the rear surface of the display panel, the first part of the tail includes a bent portion, a first component and a second component, the first component is configured to be placed on the front surface of the display panel, and the second component is configured to be placed on the rear surface of the display panel.

8. The display device according to claim 1, in, The printed circuit board, the body portion, and the first portion of the tail portion are configured to be placed on a rear surface of the display panel.

Images