Display device and portable terminal

Abstract

A display device and a portable terminal are disclosed. The display device includes: a display panel that displays an image; a flexible printed circuit board including an attachment portion attached to one end of the display panel and a bent portion extending from the attachment portion and not overlapping with the display panel; a window assembly disposed on an upper surface of the display panel; an adhesive portion disposed between the window assembly and the display panel to couple the display panel and the window assembly; and a compensation portion that does not overlap with the display panel, overlaps with the bent portion, and is disposed on the same layer as the adhesive portion.

Description

[0001] Cross-reference to Related Applications

[0002] The entire content of Korean Patent Application No. 10-2015-0033352, filed with the Korean Intellectual Property Office on March 10, 2015, entitled "Display Device and Portable Terminal", is incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a display device and a portable terminal. Background Art

[0004] A display device may include a display panel, a driving circuit board for driving the display panel, and a flexible printed circuit board electrically connecting the display panel and the driving circuit board. Summary of the Invention

[0005] Embodiments may be implemented by providing a display device including: a display panel that displays an image; a flexible printed circuit board including an attachment portion attached to one end of the display panel and a bent portion extending from the attachment portion and not overlapping with the display panel; a window assembly disposed on an upper surface of the display panel; an adhesive portion disposed between the window assembly and the display panel to couple the display panel and the window assembly; and a compensation portion that does not overlap with the display panel, overlaps with the bent portion, and is disposed on the same layer as the adhesive portion.

[0006] A first surface of the compensation portion may be coupled to the window assembly, and a second surface of the compensation portion, opposite to the first surface, may be exposed to air and face the bent portion.

[0007] The display device may further include a connection portion disposed between the adhesive portion and the compensation portion to connect the adhesive portion and the compensation portion, and when observed in a plan view, the connection portion overlaps with the attachment portion. The adhesive portion, the connection portion, and the compensation portion may be integrally formed as a single unit.

[0008] The adhesive portion, the connection portion, and the compensation portion may be an optically transparent adhesive film.

[0009] The bent portion may include: a first bent portion that gets closer to the window assembly as the distance from the display panel increases; and a second bent portion that gets farther away from the window assembly as the distance from the display panel increases, and when observed in a plan view, the compensation portion overlaps with one or more of the first bent portion and the second bent portion.

[0010] A first distance between the attachment portion and the connection portion may be greater than a second distance between the first bent portion and the compensation portion.

[0011] A boundary portion where the first bent portion meets the second bent portion may be attached to the compensation portion.

[0012] The bent portion may further include a third bent portion disposed between the first bent portion and the second bent portion, and the third bent portion may be attached to the compensation portion.

[0013] The compensation portion may include a non-adhesive material.

[0014] The compensation portion may include the same material as the adhesive portion.

[0015] The compensation portion may be spaced apart from the adhesive portion.

[0016] The shortest distance between the bent portion and the compensation portion may be less than the distance between the attachment portion and the window assembly.

[0017] The compensation portion may be spaced apart from the bent portion.

[0018] The compensation portion may have a thickness equal to or greater than the thickness of the adhesive portion.

[0019] The window assembly may include a window member and a touch panel disposed between the window member and the display panel. The first surface of the adhesive portion may be attached to the touch panel, and the second surface of the adhesive portion may be attached to the display panel.

[0020] The display panel may include: a base substrate; a pad portion disposed on one surface of the base substrate and electrically connected to a flexible printed circuit board; an organic light-emitting diode layer disposed on the base substrate; a packaging layer for sealing the organic light-emitting diode layer to expose the pad portion; and a touch portion disposed on the packaging layer, and the adhesive portion may be disposed between the window assembly and the touch portion to couple the display panel and the window assembly.

[0021] The display panel may further include an optical member facing the window assembly, and the adhesive portion may be disposed between the optical member and the window assembly to couple the display panel and the window assembly.

[0022] An embodiment may be implemented by providing a portable terminal including: a display panel; a flexible printed circuit board attached to one end of the display panel and bent to the rear surface of the display panel; a window assembly disposed on the upper surface of the display panel; an adhesive portion disposed between the display panel and the window assembly to couple the display panel and the window assembly; and a compensation portion coupled to the surface of the window assembly to which the adhesive portion is attached, the compensation portion facing the flexible printed circuit board, and the distance between the compensation portion and the flexible printed circuit board changes as the distance from the display panel changes.

[0023] The flexible printed circuit board may be spaced apart from the compensation portion.

[0024] The compensation portion and the adhesive portion may be connected to each other to have a single unit shape.

[0025] When observed in a plan view, the compensation part may not overlap with the display panel.

[0026] An embodiment may be implemented by providing a display device including: a display panel; a flexible printed circuit board attached to one end of the display panel and bent to the rear surface of the display panel; a touch panel disposed on the display panel; a window member disposed on the touch panel; and an adhesive film disposed between the display panel and the touch panel, the adhesive film being attached to one surface of the touch panel and extending from a region where the touch panel overlaps with the display panel to a region where the touch panel does not overlap with the display panel to overlap with the flexible printed circuit board.

[0027] The distance between the flexible printed circuit board and the adhesive film may vary depending on the distance from the display panel.

[0028] A part of the flexible printed circuit board that does not overlap with the display panel when observed in a plan view may be attached to the adhesive film.

[0029] The flexible printed circuit board may be spaced apart from the adhesive film. Description of the Drawings

[0030] By describing exemplary embodiments in detail with reference to the drawings, the features will become apparent to those skilled in the art, in which:

[0031] Figure 1 A perspective view of a display device according to an exemplary embodiment of the present disclosure is shown;

[0032] Figure 2 An exploded perspective view of a display device according to an exemplary embodiment of the present disclosure is shown;

[0033] Figure 3 A cross-sectional view of a display device according to an exemplary embodiment of the present disclosure is shown;

[0034] Figure 4 Shows Figure 3 A plan view of the display device shown in

[0035] Figure 5 A cross-sectional view of a display device according to an exemplary embodiment of the present disclosure is shown;

[0036] Figure 6 A cross-sectional view of a display device according to an exemplary embodiment of the present disclosure is shown;

[0037] Figure 7 Shows Figure 6 A plan view of the display device shown in

[0038] Figure 8 A cross-sectional view of a display device according to an exemplary embodiment of the present disclosure is shown;

[0039] Figure 9 Shows a cross-sectional view of a display device according to an exemplary embodiment of the present disclosure;

[0040] Figure 10 Shows a cross-sectional view of a display device according to an exemplary embodiment of the present disclosure;

[0041] Figure 11 Shows a cross-sectional view of a display device according to an exemplary embodiment of the present disclosure;

[0042] Figure 12 Shows Figure 11 a plan view of the display device shown in;

[0043] Figure 13 Shows a cross-sectional view of a display device according to an exemplary embodiment of the present disclosure;

[0044] Figure 14 Shows a cross-sectional view of a display device according to an exemplary embodiment of the present disclosure;

[0045] Figure 15 Shows a cross-sectional view of a display device according to an exemplary embodiment of the present disclosure;

[0046] Figure 16 Shows a plan view of a display panel according to an exemplary embodiment of the present disclosure; and

[0047] Figure 17 Shows an equivalent circuit diagram of a pixel according to an exemplary embodiment of the present disclosure. Detailed Description

[0048] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, they may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the exemplary implementations to those skilled in the art.

[0049] In the drawings, for clarity of illustration, the sizes of layers and regions may be exaggerated. In all the drawings, the same reference numerals refer to the same elements.

[0050] It should be understood that although terms such as first and second are used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or section from another region, layer, or section. It should be understood that when an element or layer is referred to as being "on," "connected to," or "coupled to" another element or layer, it can be directly on the other element or layer, or directly connected to or coupled to the other element or layer, or there may be intervening elements or layers therebetween.

[0051] Figure 1 A perspective view of a display device DD according to an exemplary embodiment of the present disclosure is shown.

[0052] As a typical example, Figure 1 A planar portable terminal to which the display device DD according to an exemplary embodiment of the present disclosure can be applied is shown. In an embodiment, the portable terminal can be applied to various display devices according to the embodiment, for example, a curved display device, a bent display device, a rollable display device, a foldable display device, or a stretchable display device. In an embodiment, the display device DD can be applied to large-sized electronic articles, such as a television or an outdoor billboard, as well as small-sized and medium-sized electronic articles, such as a personal computer, a notebook computer, a personal digital assistant (PDA), an in-vehicle navigation unit, a game unit, a wrist-worn electronic device, or a camera.

[0053] The display device DD may include a plurality of different regions located on the display surface. The display device DD may include a display region DR and a non-display region NDR, wherein an image IM can be displayed through the display region DR, and the non-display region NDR is disposed adjacent to the display region DR. The display surface through which the image IM is displayed may be substantially parallel to the surface defined by a first direction DR1 and a second direction DR2, and the normal direction of the display surface is referred to as a third direction DR3. In an embodiment, the third direction DR3 can be used as a reference direction for dividing the front surface and the rear surface of each component.

[0054] Figure 2 An exploded perspective view of the display device DD according to an exemplary embodiment of the present disclosure is shown, Figure 3 A cross-sectional view of the display device DD according to an exemplary embodiment of the present disclosure is shown, and Figure 4 is shown Figure 3 A plan view of the shown display device DD.

[0055] Referring to Figure 2 、 Figure 3 and Figure 4, the display device DD may include a display panel 100, a flexible printed circuit board 110, a protection member 120, a driving circuit board 130, a window assembly WA, an adhesive film AF, and a cover member 400.

[0056] The display panel 100 may generate an image corresponding to the image data applied to the display panel 100. The display panel 100 may be various display panels, for example, an organic light-emitting display panel, a liquid crystal display panel, a plasma display panel, an electrophoretic display panel, or an electro-wetting display panel. In the present exemplary embodiment, the organic light-emitting display panel will be described as the display panel 100.

[0057] The display panel 100 may include a base substrate BS, a circuit layer ML, an organic light-emitting diode layer EL, a packaging layer ECL, a pad portion PAD, and an optical member PL.

[0058] The base substrate BS may include one or more of a glass substrate, a sapphire substrate, or a plastic substrate. The circuit layer ML, the organic light-emitting diode layer EL, the packaging layer ECL, the pad portion PAD, and the optical member PL may be disposed on the base substrate BS.

[0059] The circuit layer ML may include a plurality of signal lines and a plurality of electronic devices that may be included in the display panel 100. For example, the circuit layer ML may include gate lines, data lines, and thin film transistors corresponding to pixels, respectively.

[0060] The organic light-emitting diode layer EL may generate light having a color corresponding to the light-emitting material. In an embodiment, the color may include red, green, blue, and white.

[0061] The packaging layer ECL may include a thin film encapsulation layer (TFE), that is, a plurality of inorganic thin film layers and a plurality of organic thin film layers. The packaging layer ECL may cover the organic light-emitting diode layer EL and may block external moisture and air to protect the organic light-emitting diode layer EL. In the present exemplary embodiment, the packaging layer ECL may be replaced with a packaging substrate. The packaging substrate may be disposed to be spaced apart from the base substrate BS such that the organic light-emitting diode layer EL may be disposed between the packaging substrate and the base substrate BS. The packaging substrate and the base substrate BS may be coupled to each other by a sealant formed along the edge of the base substrate BS.

[0062] The pad portion PAD may include pads corresponding to the signal lines electrically connected to the pixels in a one-to-one correspondence and electrically connected to the signal lines. The pad portion PAD may be electrically connected to the flexible printed circuit board 110 and may receive signals for driving the display panel 100 from the driving circuit board 130.

[0063] The optical member PL may include one or more retardation plates or polarizing plates. When the optical member PL includes a retardation plate and a polarizing plate, the polarizing plate may be disposed on top of the retardation plate. External light incident on the window assembly WA may be linearly polarized when passing through the polarizing plate. The linearly polarized light may be reflected after passing through the retardation plate and may be incident on the polarizing plate again after passing through the retardation plate once more. The linearly polarized light may be circularly polarized to have a phase difference of approximately 45 degrees when passing through the retardation plate. Thus, the external light may pass through the retardation plate again without passing through the polarizing plate and may be eliminated. For example, the right-handed polarized light after passing through the retardation plate may be converted into left-handed polarized light after being reflected, and the right-handed polarized light may interfere destructively with the left-handed polarized light, so that the external light may be eliminated. Therefore, the reflectance of the display device DD to external light may be reduced. According to an embodiment, the optical member PL may be omitted.

[0064] The flexible printed circuit board 110 may be attached to one end of the display panel 100 and bent to the rear surface of the display panel 100. The flexible printed circuit board 110 may include an attachment portion 111 and a bending portion 112, wherein the attachment portion 111 may be attached to one end of the display panel 100, and the bending portion 112 extends from the attachment portion 111. The attachment portion 111 may be electrically connected to the pad portion PAD and may apply a signal to the display panel 100. The data driving chip may be mounted on one surface of the flexible printed circuit board 110. In response to an external signal, the data driving chip may generate a data signal, and the data signal may be applied to the data line DL of the display panel 100 (see Figure 16 ).

[0065] When viewed in a plan view, the bending portion 112 may not overlap with the display panel 100. For example, the area of the flexible printed circuit board 110 that may extend away from the display panel 100 and may face the window assembly WA may correspond to the bending portion 112.

[0066] The bent portion 112 may include a first bent portion 112a and a second bent portion 112b. The distance DI1 between the first bent portion 112a and the window assembly WA may decrease as the first bent portion 112a becomes further away from the display panel 100. For example, the distance DI1 between the first bent portion 112a and the window assembly WA may decrease along the first bent portion 112a in a direction away from the display panel 100. The distance DI2 between the second bent portion 112b and the window assembly WA may increase as the second bent portion 112b becomes further away from the display panel 100. For example, the distance DI2 between the second bent portion 112b and the window assembly WA may increase along the second bent portion 112b in a direction away from the display panel 100. In terms of the shape of the flexible printed circuit board 110 bent to the rear surface of the display panel 100, the first bent portion 112a and the second bent portion 112b may be different from each other. According to an embodiment, the distance DI1 between the first bent portion 112a and the window assembly WA may be a constant value even if the first bent portion 112a becomes further away from the display panel 100. For example, the distance DI1 between the first bent portion 112a and the window assembly WA may be a constant value along the first bent portion 112a in a direction away from the display panel 100, and the distance DI2 between the second bent portion 112b and the window assembly WA may increase even if the second bent portion 112b becomes further away from the display panel 100. For example, the distance DI2 between the second bent portion 112b and the window assembly WA may increase along the second bent portion 112b in a direction away from the display panel 100.

[0067] The protection member 120 may include one or more of a buffer member or a heat dissipation member. The buffer member may include a material having high impact absorption properties. For example, the buffer member may be formed of a polymeric resin, such as polyurethane, polycarbonate, polypropylene, or polyethylene, or formed of a rubber solution, a urethane-based material, or a sponge obtained by foaming / molding an acrylic-based material.

[0068] In an embodiment, the heat dissipation member may include one or more of graphite, copper, or aluminum, which may have excellent heat dissipation properties. The heat dissipation member may have electromagnetic wave shielding properties or electromagnetic wave absorption properties.

[0069] The driving circuit board 130 may be disposed on the rear surface of the display panel 100. The driving circuit board 130 may be electrically connected to the display panel 100 through the flexible printed circuit board 110. The driving circuit board 130 may apply an image signal of a display image and a control signal for driving the display panel 100 to the display panel 100.

[0070] The driving circuit board 130 may include a base substrate, and the base substrate may be, for example, a flexible printed circuit board. In this case, the base substrate may be, for example, a flexible plastic sheet such as polyimide or polyester.

[0071] The window assembly WA may be disposed on the upper surface of the display panel 100. The window assembly WA may include a touch panel 200, a window member 300, and an adhesive member OCA.

[0072] The touch panel 200 may obtain coordinate information of a touch position. The touch panel 200 may be disposed on the upper surface of the display panel 100. The touch panel 200 may be a resistive touch panel, a capacitive touch panel, or an electromagnetic induction touch panel. In the present exemplary embodiment, the touch panel 200 may be a capacitive touch panel. The touch panel 200 may include two types of sensors that cross each other. The capacitive touch panel may obtain coordinate information of a touch position by a self-capacitance method or a mutual-capacitance method.

[0073] The window member 300 may include a base substrate and a black matrix. The base substrate may be, for example, a silicon substrate, a glass substrate, a sapphire substrate, or a plastic film. The black matrix may be disposed on the rear surface of the base substrate to define a border area, that is, a non-display area NDR of the display device DD (see Figure 1 ). The black matrix may be formed by coating a colored organic material. The window member 300 may further include a functional coating layer disposed on the front surface of the base member. The functional coating layer may include, for example, an anti-fingerprint layer, an anti-reflection layer, or a hard coating layer.

[0074] The touch panel 200 and the window member 300 may be coupled to each other by the adhesive member OCA. In an embodiment, the adhesive member OCA may include an optically transparent adhesive film. For example, the adhesive member OCA may be an optically transparent resin.

[0075] The adhesive film AF may be disposed between the window assembly WA and the display panel 100. The window assembly WA and the display panel 100 may be coupled to each other by the adhesive film AF. The adhesive film AF may be attached to one surface of the touch panel 200 and may extend from the area where the touch panel 200 overlaps with the display panel 100 to the area where the touch panel 200 does not overlap with the display panel 100.

[0076] The adhesive film AF may include an adhesive portion AF_1, a compensation portion AF_2, and a connection portion AF_3. When observed in a plan view, the adhesive portion AF_1 may overlap with the display panel 100 and may couple the display panel 100 and the window assembly WA. When observed in a plan view, the compensation portion AF_2 may overlap with the bending portion 112 and may compensate for the gap between the window assembly WA and the bending portion 112. The compensation portion AF_2 may overlap with at least half of the flexible printed circuit board 110 without overlapping with the display panel 100. When observed in a plan view, the connection portion AF_3 may overlap with the attachment portion 111.

[0077] The connection portion AF_3 may be disposed between the adhesive portion AF_1 and the compensation portion AF_2 and may connect the adhesive portion AF_1 and the compensation portion AF_2. For example, the adhesive portion AF_1, the compensation portion AF_2, and the connection portion AF_3 may be integrally formed with each other to form an adhesive film AF. For example, the adhesive film AF may extend to an area where the touch panel 200 does not overlap with the display panel 100 and may overlap with the bending portion 112. The adhesive portion AF_1, the compensation portion AF_2, and the connection portion AF_3 may have the same thickness.

[0078] The distance DT1 between the attachment portion 111 and the connection portion AF_3 may be a fixed value, and the distance between the bending portion 112 and the compensation portion AF_2 may vary according to the distance from the display panel 100. In the present exemplary embodiment, when observed in a plan view, the compensation portion AF_2 may overlap with the first bending portion 112a. The second distance DT2 between the first bending portion 112a and the compensation portion AF_2 may decrease as the distance from the display panel 100 increases. The second distance DT2 may be less than the first distance DT1, and the shortest distance between the bending portion 112 and the compensation portion AF_2 may be less than the first distance DT1.

[0079] According to the present exemplary embodiment, a part of the gap between the window assembly WA and the flexible printed circuit board 110 can be easily filled by extending the adhesive film AF without adding a separate material or process. Therefore, the flexible printed circuit board 110 can be moved upward and the space for the window assembly WA can be reduced. Although an external force may be applied to the bent flexible printed circuit board 110 when assembling the cover member 400, the change in the position and shape of the flexible printed circuit board 110 can be reduced. Thus, defects on the flexible printed circuit board 110 can be avoided and the reliability of the display device DD can be improved.

[0080] In the present exemplary embodiment, the adhesive film AF may be an optically transparent adhesive film. In an embodiment, the adhesive film AF may be replaced with an optically transparent resin.

[0081] The cover member 400 can accommodate the display panel 100 and can be coupled to the window assembly WA. The cover member 400 can be manufactured by assembling a plurality of parts or manufactured integrally by an injection molding process. The cover member 400 can include a plastic or metal material.

[0082] Figure 5 A cross-sectional view of a display device DDa according to an exemplary embodiment of the present disclosure is shown. In Figure 5 , the same reference numerals denote Figure 3 the same elements, and detailed descriptions of the same elements will be omitted.

[0083] Referring to Figure 5 , a boundary portion 112BL between the first bending portion 112a and the second bending portion 112b can be attached to the compensation portion AF_2. When the window assembly WA is attached to the display panel 100, the boundary portion 112BL can be attached to the compensation portion AF_2.

[0084] In the present exemplary embodiment, a portion of the flexible printed circuit board 110 can be attached to the compensation portion AF_2, and changes in the position and shape of the flexible printed circuit board 110 can be prevented, even when the cover member 400 is assembled (see Figure 1 ). Thus, an external force can be applied to the flexible printed circuit board 110. Accordingly, separation of the attachment portion 111 from the pad portion PAD due to, for example, an external force can be prevented, cracking of lines disposed on the flexible printed circuit board 110 can be prevented, and the reliability of the display device DDa can be improved.

[0085] Figure 6 A cross-sectional view of a display device DDb according to an exemplary embodiment of the present disclosure is shown, and Figure 7 is Figure 6 a plan view of the display device DDb shown in Figure 6 and Figure 7 , the same reference numerals denote Figure 3 the same elements, and detailed descriptions of the same elements will be omitted.

[0086] Referring to Figure 6 and Figure 7 , the adhesive film AFa can include an adhesive portion AF_1, a compensation portion AF_2a, and a connection portion AF_3. When viewed in plan, the adhesive portion AF_1 can overlap the display panel 100 and can couple the display panel 100 and the window assembly WA. When viewed in plan, the compensation portion AF_2a can overlap the first bending portion 112a and the second bending portion 112b, and when viewed in plan, the connection portion AF_3 can overlap the attachment portion 111.

[0087] In the present exemplary embodiment, the adhesive film AFa may extend to a region corresponding to an end portion of the flexible printed circuit board 110 that is bent. A part of a gap between the window assembly WA and the flexible printed circuit board 110 may be filled with the adhesive film AFa. Accordingly, the flexible printed circuit board 110 may move upward such that a space for the window assembly WA may be reduced. Accordingly, although an external force may be applied to the bent flexible printed circuit board 110, changes in the position and shape of the flexible printed circuit board 110 may be reduced, and the reliability of the display device DDb may be improved.

[0088] Figure 8 A cross-sectional view of a display device DDc according to an exemplary embodiment of the present disclosure is shown. In Figure 8 , like reference numerals denote Figure 3 like elements in

[0089] Referring to Figure 8 , the flexible printed circuit board 110_1 may be bent to a rear surface of the display panel 100. The flexible printed circuit board 110_1 may include an attachment portion 111 attached to the display panel 100, and a bent portion 112-1 extending from the attachment portion 111 and being away from the display panel 100.

[0090] The bent portion 112_1 may include a first bent portion 112a_1, a second bent portion 112b_1, and a third bent portion 112c_1, where the first bent portion 112a_1 is closer to the window assembly WA as a distance from the display panel 100 increases, the second bent portion 112b_1 is further away from the window assembly WA as the distance from the display panel 100 increases, and the third bent portion 112c_1 is disposed between the first bent portion 112a_1 and the second bent portion 112b_1. The third bent portion 112c_1 may be attached to the compensation portion AF_2. When viewed in a cross-sectional view, the third bent portion 112c_1 may have a substantially flat shape.

[0091] In the present exemplary embodiment, the third bent portion 112c_1 may be attached to the compensation portion AF_2, and may prevent the flexible printed circuit board 110_1 attached to the display panel 100 from moving upward, even if an external force may be applied to the bent flexible printed circuit board 110_1. Accordingly, separation of the attachment portion 111 from the pad portion PAD due to, for example, an external force may be prevented, cracking of lines disposed on the flexible printed circuit board 110_1 may be prevented, and the reliability of the display device DDc may be improved.

[0092] Figure 9 A cross-sectional view of a display device DDd according to an exemplary embodiment of the present disclosure is shown. In Figure 9 , like reference numerals denote Figure 3Elements that are the same as those in [reference] will not be described in detail.

[0093] Referring to Figure 9 , the adhesive film AFb may include an adhesive portion AF_1 and a compensation portion AF_2b spaced apart from the adhesive portion AF_1. In the present exemplary embodiment, compared with the display device DD shown in Figure 3 , the connecting portion AF_3 (see Figure 3 ) may be omitted.

[0094] When viewed in a plan view, the compensation portion AF_2b may overlap with the first bending portion 112a and not overlap with the second bending portion 112b. The compensation portion AF_2b may compensate for the gap between the flexible printed circuit board 110 and the window assembly WA.

[0095] One surface of the compensation portion AF_2b may be attached to the window assembly WA, and the other surface of the compensation portion AF_2b opposite to the one surface may be exposed to the air.

[0096] In the present exemplary embodiment, the compensation portion AF_2b may include the same material as the material of the adhesive portion AF_1. Thus, the flexible printed circuit board 110 may be arranged to be spaced apart from the compensation portion AF_2b as shown in Figure 9 , however, the flexible printed circuit board 110 may also be attached to the compensation portion AF_2b as shown in Figure 5 and Figure 8 .

[0097] In the present exemplary embodiment, the compensation portion AF_2b may be provided separately from the adhesive portion AF_1, and the compensation portion AF_2b may be deformable. For example, the size and thickness of the compensation portion AF_2b may vary in various ways according to the gap between the window assembly WA and the flexible printed circuit board 110 and the size of the display device DDd, and the gap between the window assembly WA and the flexible printed circuit board 110 may be filled without directly affecting the thickness of the display device DDd.

[0098] Figure 10 A cross-sectional view of a display device DDe according to an exemplary embodiment of the present disclosure is shown. In Figure 10 , the same reference numerals denote Figure 3 the same elements as those in [reference], and the detailed description of the same elements will be omitted.

[0099] Referring to Figure 10 , the adhesive film AFc may include an adhesive portion AF_1 and a compensation portion AF_2c spaced apart from the adhesive portion AF_1.

[0100] When observed in a plan view, the compensation portion AF_2c may not overlap with the first bent portion 112a and may overlap with the second bent portion 112b. The compensation portion AF_2c may compensate for the gap between the flexible printed circuit board 110 and the window assembly WA. Accordingly, changes in the position and shape of the flexible printed circuit board 110 may be reduced even if an external force is applied to the bent flexible printed circuit board 110, and the reliability of the display device DDe may be improved.

[0101] Figure 11 A cross-sectional view of a display device DDf according to an exemplary embodiment of the present disclosure is shown, and Figure 12 shows Figure 11 a plan view of the shown display device. In Figure 11 and Figure 12 , the same reference numerals denote Figure 3 the same elements in

[0102] Referring to Figure 11 and Figure 12 , the adhesive film AFd may include an adhesive portion AF_1 and a compensation portion AF_2d spaced apart from the adhesive portion AF_1. The adhesive portion AF_1 may have a first thickness TN1 equal to a second thickness TN2 of the compensation portion AF_2d.

[0103] The compensation portion AF_2d may overlap with the first bent portion 112a and the second bent portion 112b. The compensation portion AF_2d may compensate for the gap between the flexible printed circuit board 110 and the window assembly WA. Accordingly, changes in the position and shape of the flexible printed circuit board 110 may be reduced even if an external force is applied to the bent flexible printed circuit board 110, and the reliability of the display device DDf may be improved.

[0104] Figure 13 A cross-sectional view of a display device DDg according to an exemplary embodiment of the present disclosure is shown. In Figure 13 , the same reference numerals denote Figure 3 the same elements in

[0105] Referring to Figure 13, the adhesive film AFe may include an adhesive portion AF_1 and a compensation portion AF_2e spaced apart from the adhesive portion AF_1. In the present exemplary embodiment, the compensation portion AF_2e may have a second thickness TN3 thicker than a first thickness TN1 of the adhesive portion AF_1, and a gap between the window assembly WA and the flexible printed circuit board 110 may be reduced by the second thickness TN3. The second thickness TN3 may be thicker than the first thickness TN1, and a space in which the flexible printed circuit board 110 can move may be reduced more when the second thickness TN3 is equal to the first thickness TN1. Accordingly, changes in the position and shape of the flexible printed circuit board 110 may be reduced even when an external force may be applied to the bent flexible printed circuit board 110, and the reliability of the display device DDg may be improved.

[0106] Figure 14 A cross-sectional view of a display device Ddh according to an exemplary embodiment of the present disclosure is shown. In Figure 14 , the same reference numerals denote Figure 3 the same elements in

[0107] Referring to Figure 14 , the display device Ddh may include an adhesive portion AFf and a compensation portion CM, wherein the adhesive portion AFf is disposed between the window assembly WA and the display panel 100 to couple the window assembly WA and the display panel 100, and when viewed in a plan view, the compensation portion CM overlaps with the flexible printed circuit board 110 and does not overlap with the display panel 100.

[0108] One surface of the compensation portion CM may be coupled to the window assembly WA, and a part of the other surface of the compensation portion CM opposite to the one surface may be exposed to air and may face the bent portion 112. In this case, the bent portion 112 may move in a third direction DR3, and the bent portion 112 may contact the compensation portion CM.

[0109] The compensation portion CM may include a non-adhesive material. For example, the compensation portion CM may include a plastic material such as polyimide, polyethylene terephthalate, or polyethylene naphthalene.

[0110] The compensation portion CM may have a thickness TN4 equal to or greater than the thickness TN1 of the adhesive portion AFf. The thickness TN4 of the compensation portion CM may be determined according to a gap between the window assembly WA and the flexible printed circuit board 110.

[0111] In the present exemplary embodiment, when observed in a plan view, the compensation part CM may overlap with the first bending part 112a. In an embodiment, the compensation part CM may not overlap with the first bending part 112a and may overlap with the second bending part 112b. According to an embodiment, the compensation part CM may overlap with both the first bending part 112a and the second bending part 112b.

[0112] Figure 15 A cross-sectional view of a display device DDi according to an exemplary embodiment of the present disclosure is shown.

[0113] Referring Figure 15 , the display device DDi may include a window assembly WA1, a display panel 100_1, a flexible printed circuit board 110, and an adhesive film AFg.

[0114] In the present exemplary embodiment, the display panel 100_1 may include a base substrate BS, a circuit layer ML, an organic light emitting diode layer EL, a packaging layer ECL, a pad part PAD, and a touch part TS. The touch part TS may be directly disposed on the packaging layer ECL.

[0115] The window assembly WA1 may include a base member and a black matrix. The base member may include a silicon substrate, a glass substrate, or a plastic film. The black matrix may be disposed on the rear surface of the base member to define a border area, that is, a non-display area NDR of the display device DDi (see Figure 1 ).

[0116] The adhesive film AFg may be disposed between the window assembly WA1 and the display panel 100_1. The adhesive film AFg may include an adhesive part AF_1g, a compensation part AF_2g, and a connection part AF_3g.

[0117] One surface of each of the adhesive part AF_1g, the compensation part AF_2g, and the connection part AF_3g may be attached to the window assembly WA1. The other surface of the adhesive part AF_1g, which may be opposite to the one surface of the adhesive part AF_1g attached to the window assembly WA1, may be attached to the touch part TS. The other surface AF_2g of the compensation part AF_2g, which may be opposite to the one surface of the compensation part AF_2g attached to the window assembly WA1, may be exposed to air to face the bending part 112, for example, may face the first bending part 112a.

[0118] According to the present exemplary embodiment, the gap between the window assembly WA1 and the flexible printed circuit board 110 can be easily compensated by extending the adhesive film AFg without adding separate materials or processes. Therefore, although an external force may be applied to the bent flexible printed circuit board 110 when the cover member 400 is assembled, changes in the position and shape of the flexible printed circuit board 110 can be reduced. Accordingly, defects on the flexible printed circuit board 110 can be prevented, and the reliability of the display device DDi can be improved.

[0119] Figure 16 A plan view of a display panel according to an exemplary embodiment of the present disclosure is shown, and Figure 17 an equivalent circuit diagram of a pixel according to an exemplary embodiment of the present disclosure is shown.

[0120] Referring to Figure 3 、 Figure 16 and Figure 17 ,the circuit layer ML may include a plurality of signal lines SGL, thin film transistors TR1 and TR2, at least one capacitor Cap, and a gate driving circuit DCV disposed on one side of the non-display area NDR.

[0121] The signal lines SGL include gate lines GL and data lines DL. Each of the gate lines GL may be connected to a corresponding pixel in the pixel PX, and each of the data lines DL may be connected to a corresponding pixel in the pixel PX. The gate lines GL may extend in the second direction DR2 and may be arranged in the first direction DR1, and the data lines DL may extend in the first direction DR1 and may be arranged in the second direction DR2.

[0122] The pad portion PAD may include a gate pad GL-P and a data pad DL-P. The gate pad GL-P may be electrically connected to the gate line GL, and the data pad DL-P may be electrically connected to the data line DL. The gate pad GL-P and the data pad DL-P disposed in the non-display area NDR may be coupled to the attachment portion 111 of the flexible printed circuit board 110.

[0123] The organic light emitting diode layer EL may include display elements. The organic light emitting diode layer EL may include organic light emitting diodes OLEDs of the pixel PX. The organic light emitting diode layer EL may further include an organic layer to assist the organic light emitting diodes.

[0124] The display panel 100 may receive a first power supply voltage ELVDD and a second power supply voltage ELVSS from an external power supply. Each pixel PX may be turned on in response to a corresponding gate signal in the gate signals. Each pixel PX may receive the first power supply voltage ELVDD and the second power supply voltage ELVSS, and may generate light in response to a corresponding data signal in the data signals.

[0125] Through summary and review, a display device may include a display panel, a driving circuit board for driving the display panel, and a flexible printed circuit board electrically connecting the display panel and the driving circuit board. When a cover member is coupled to the display panel, an external force may be applied to the flexible printed circuit board, and the flexible printed circuit board may be deformed. Due to, for example, the deformation of the flexible printed circuit board, the lines disposed on the flexible printed circuit board may be cracked.

[0126] The present disclosure provides a display device capable of reducing defects, and a portable terminal capable of reducing defects.

[0127] According to an embodiment, a gap between the window assembly and the flexible printed circuit board may be compensated by extending an adhesive film. Accordingly, although an external force may be applied to the bent flexible printed circuit board when the cover member is assembled, changes in the position and shape of the flexible printed circuit board may be reduced. Accordingly, defects on the flexible printed circuit board may be prevented, and the reliability of the display device may be improved.

[0128] Exemplary embodiments have been disclosed herein, and although specific terms are employed, they are used in a general and descriptive sense only and are not for purposes of limitation. In some instances, as will be apparent to those of ordinary skill in the art to which this application pertains, unless specifically stated otherwise, features, characteristics, and / or elements described in connection with a particular embodiment may be used singly or in combination with features, characteristics, and / or elements described in connection with other embodiments. Accordingly, those of ordinary skill in the art will understand that various forms and details may be changed without departing from the spirit and scope of the invention as set forth in the following claims.

Claims

1. A portable terminal, comprising: a display panel; a flexible printed circuit board having a contact portion attached to the display panel and a bent portion extending from the contact portion, the contact portion overlapping the display panel, and when viewed in a plan view, the bent portion extending from the contact portion outside the display panel; a window assembly on the display panel; an adhesive portion between the display panel and the window assembly to couple the display panel and the window assembly; a compensation portion coupled to the window assembly and overlapping the bent portion of the flexible printed circuit board; and a connection portion between the adhesive portion and the compensation portion to connect the adhesive portion and the compensation portion, and the connection portion is on the same layer as the adhesive portion, wherein: a first surface of the compensation portion is coupled to the window assembly, and a second surface of the compensation portion, opposite to the first surface, is exposed to air and faces the bent portion.

2. The portable terminal according to claim 1, wherein, at least a part of the bent portion of the flexible printed circuit board is closer to the window assembly than the contact portion of the flexible printed circuit board.

3. The portable terminal according to claim 1, wherein, the flexible printed circuit board is spaced apart from the compensation portion.

4. The portable terminal according to claim 1, wherein, the compensation portion and the adhesive portion are connected to each other to have a single unit shape.

5. The portable terminal according to claim 1, wherein, when viewed in a plan view, the compensation portion does not overlap the display panel.

6. A portable terminal, comprising: a display panel; a polarizing plate in the display panel; a flexible printed circuit board having a contact portion attached to the display panel and a bent portion extending from the contact portion, the contact portion overlapping the display panel, and when viewed in a plan view, the bent portion extending from the contact portion outside the display panel; a window assembly on the display panel; a touch panel between the window assembly and the display panel; an adhesive portion between the display panel and the window assembly to couple the display panel and the window assembly; a compensation portion coupled to the window assembly and overlapping the bent portion of the flexible printed circuit board; and a connection portion between the adhesive portion and the compensation portion to connect the adhesive portion and the compensation portion, and the connection portion is on the same layer as the adhesive portion, wherein: a first surface of the compensation portion is coupled to the window assembly, and a second surface of the compensation portion, opposite to the first surface, is exposed to air and faces the bent portion.

7. The portable terminal according to claim 6, wherein, at least a part of the bent portion of the flexible printed circuit board is closer to the window assembly than the contact portion of the flexible printed circuit board.

8. The portable terminal according to claim 6, wherein, the flexible printed circuit board is spaced apart from the compensation portion.

9. The portable terminal according to claim 6, wherein, The compensation part and the adhesion part are connected to each other to have a single unit shape.

10. The portable terminal according to claim 6, wherein when observed in a plan view, the compensation part does not overlap the display panel.

11. A display device, comprising: a display panel; a flexible printed circuit board attached to one end of the display panel and bent to the rear surface of the display panel; a window disposed on the display panel; and an adhesive film disposed under the window, wherein the adhesive film includes: an adhesion part between the display panel and the window; a compensation part coupled to the window and not overlapping the display panel; and a connection part between the adhesion part and the compensation part to connect the adhesion part and the compensation part, and the connection part is on the same layer as the adhesion part, wherein: a first surface of the compensation part is coupled to the window, and a second surface of the compensation part, opposite to the first surface, is exposed to air and faces a bent part of the flexible printed circuit board.

12. The display device according to claim 11, wherein the thickness of the compensation part is greater than the thickness of the adhesion part.

13. The display device according to claim 11, wherein the window includes a base member and a touch panel disposed between the base member and the display panel, wherein the adhesion part, the connection part, and the compensation part are attached to the touch panel.

14. The display device according to claim 11, further comprising a touch panel disposed between the display panel and the adhesion part, wherein the adhesion part is attached to the window and the touch panel, and the compensation part is attached to the window and does not overlap the touch panel.

15. The display device according to claim 11, wherein at least a part of the flexible printed circuit board overlaps the compensation part in a plane.

16. The display device according to claim 15, wherein the flexible printed circuit board is spaced apart from the compensation part.

17. The display device according to claim 15, wherein at least a part of the flexible printed circuit board is attached to the compensation part.

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