KR20190004585A - Curved display device - Google Patents

Abstract

The present invention relates to a curved display device capable of minimizing the bezel region of the curved display device in which each of four side edges of a curved cover glass has multiple curvatures. The curved display device according to an embodiment of the present invention includes a curved substrate which includes a flat part, a first curvature part extended from the first side of the flat part and bent at a first curvature, a second curvature part extended from the second side of the flat part and bent at a second curvature, and a multiple curvature part formed by overlapping the first curvature part and the second curvature part and bent at multiple curvatures; and a display module which is disposed on the lower surface of the curved substrate and includes a pixel array layer disposed on the substrate. The edge of the substrate is disposed in the multiple curvature part.

Description

[0001] CURVED DISPLAY DEVICE [0002]

The present invention relates to a curved display device.

As the information society develops, there is a growing demand for display devices for displaying images. Recently, a non-electroluminescent display device such as a liquid crystal display (LCD) or a plasma display panel (PDP), an organic light emitting display (OLED) And an electroluminescence display device such as a quantum dot light emitting display (QLED).

Recently, an organic light emitting display device has been developed as a curved display device in which four side edges of both side edges or upper, lower, left, and right sides of a flexible display device are curved. A curved display device refers to a display device in which a flexible flexible display module is attached to a curved cover glass.

Fig. 1 is an exemplary view showing a curved surface type cover glass in which the four sides of the upper, lower, left, and right sides are curved. 4, the upper side of the curved cover glass CCG has a first curvature having a first direction, a second curvature having a second directional side on the left side, a third curvature having a third curvature on the right side, The second curvature can be bent. Each of the four side edges (C1 to C4) of the curved cover glass (CCG) is formed to have a multiple curvature including curvatures having different directions. For example, the left upper corner C1 of the curved cover glass CCG may be formed to have a multiple curvature including a first curvature having a first direction and a second curvature having a second direction. The upper right corner C2 of the curved cover glass CCG may be formed to have a multiple curvature including a first curvature having a first direction and a third curvature having a third direction. The lower right corner (C3) of the curved cover glass (CCG) may be formed to have a multiple curvature including a second curvature having a second direction and a fourth curvature having a fourth direction. The lower right corner C1 of the curved cover glass CCG may be formed to have a multiple curvature including a third curvature having a third direction and a fourth curvature having a fourth direction.

Each of the four side edges of the curved coverglass (CCG) has multiple curvatures, so there may be interference with the curved coverglass (CCG) when the flexible display module (FDP) is placed. Therefore, the flexible display module FDP is not disposed on the lower surface of the four side edges C1 to C4 of the curved cover glass CCG. In this case, the flexible display module FDP is not disposed on the upper side and the lower side of the curved cover glass CCG as shown in Fig. Therefore, there is a problem that the distances D1 and D2 from the upper end or the lower end of the cover glass CCG to the display area DA of the flexible display module FDP become longer. That is, there is a problem that the bezel area of the curved display device is widened.

The present invention is intended to provide a curved display device capable of minimizing a bezel area of a curved display device in which each of the four side edges of a curved cover glass has multiple curvatures.

A curved display device according to an embodiment of the present invention includes a flat portion, a first curvature portion extending from a first side of the flat portion and bent at a first curvature, a second curvature portion extending from a second side of the flat portion, A second curvature portion, and a curved surface portion including the first curvature portion and the second curvature portion overlapping the curvature portion and being curved in a multiple curvature; And a display module disposed on the lower surface of the curved substrate and including a pixel array layer disposed on the substrate. The edge of the substrate is disposed in the multi-curvature portion.

The embodiment of the present invention is such that the flexible display module is disposed not only in the flat portion and the first to fourth curvature portions of the curved substrate but also in the first to fourth multiple curvature portions. As a result, the embodiment of the present invention can arrange the non-display area of the flexible display module in the first to fourth multiple curvature parts. Therefore, since the distance from the upper end or the lower end of the cover glass to the display area of the flexible display module can be reduced, the bezel area of the curved display device can be minimized.

In addition, the embodiment of the present invention forms the supporting substrate of the flexible display module and the edge of the flexible substrate in an oblique cut shape in consideration of the multi curvature of the first multiple curvature portion. As a result, the embodiment of the present invention can prevent the support substrate from interfering with the curved substrate.

Furthermore, the embodiment of the present invention can calculate the length of the flexible substrate, which may not interfere with the curved substrate at the first multiple curvature portion depending on the thickness from the flexible substrate to the curved substrate. As a result, the embodiment of the present invention can prevent the flexible substrate from interfering with the curved substrate by obliquely cutting the edge of the flexible substrate according to the calculated length of the flexible substrate.

Fig. 1 is an exemplary view showing a curved surface type cover glass in which the four sides of the upper, lower, left, and right sides are curved.
2 is a perspective view of a curved display device according to an embodiment of the present invention.
3 is a plan view of a curved display device according to an embodiment of the present invention.
4 is a bottom view of a curved display device according to an embodiment of the present invention.
5 is an enlarged bottom view showing the first corner portion of FIG. 4 in detail.
6 is a cross-sectional view showing I-I 'of FIG.
7 is a cross-sectional view showing II-II 'of FIG.
FIG. 8 is a cross-sectional view showing an example of the flexible display module of FIGS. 6 and 7. FIG.
9 is a cross-sectional view showing the display area of the flexible display module of FIG. 8 in detail.
10 is an enlarged bottom view showing the second corner portion of FIG. 4 in detail.

Like reference numerals throughout the specification denote substantially identical components. In the following description, detailed descriptions of configurations and functions known in the technical field of the present invention and those not related to the core configuration of the present invention can be omitted. The meaning of the terms described herein should be understood as follows.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being 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 scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Where the terms "comprises," "having," "consisting of," and the like are used in this specification, other portions may be added as long as "only" is not used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

The terms "X-axis direction "," Y-axis direction ", and "Z-axis direction" should not be construed solely by the geometric relationship in which the relationship between them is vertical, It may mean having directionality.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, May refer to any combination of items that may be presented from more than one.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view of a curved display device according to an embodiment of the present invention. 3 is a plan view of a curved display device according to an embodiment of the present invention. 4 is a bottom view of a curved display device according to an embodiment of the present invention.

2 to 4, a curved display device (CDIS) according to an embodiment of the present invention includes a curved substrate 10, a first adhesive layer 20, a flexible display module 30, a heat dissipation substrate 40 ) And the like.

The curved substrate 10 may be formed of a plastic film or a glass substrate. The curved substrate 10 includes a flat portion FA, first to fourth curvature portions CA1 to CA4, and first to fourth multiple curvature portions DCA1 to DCA4 as shown in FIG.

The flat portion (FA) corresponds to the central region of the curved substrate (10).

The first curvature portion CA1 may be a first side region of the curved substrate 10, and an upper region of the curved substrate 10 as shown in Fig. The first curvature portion CA1 may be a region having a first direction and bent at a first curvature and extending from the first side of the flat portion FA.

The second curvature portion CA2 may be the second side region of the curved substrate 10, the left side region of the curved substrate 10 as shown in Fig. The second curvature portion CA2 may be a region having a second directionality and bent at a second curvature and extending from the second side of the flat portion FA.

The third curvature portion CA3 may be the third side region of the curved substrate 10, the right side region of the curved substrate 10 as shown in Fig. The third curvature portion CA3 may be a region having a third direction and bent at a third curvature and extending from the third side of the flat portion FA.

The fourth curvature portion CA4 may be a fourth side region of the curved substrate 10, and a lower region of the curved substrate 10 as shown in Fig. The fourth curvature portion CA4 may be a region having a fourth direction and bent at a fourth curvature and extending from the fourth side of the flat portion FA.

As shown in FIGS. 3 and 4, the first multiple curvature portion DCA1 may be a region in which the first curvature portion CA1 and the second curvature portion CA2 are overlapped and curved in multiple curvature. The first multi-curvature portion DCA1 may be located at the first corner C1 corresponding to the upper left corner of the curved substrate 10.

As shown in FIGS. 3 and 4, the second multiple curvature portion DCA2 may be a region in which the first curvature portion CA1 and the third curvature portion CA3 overlap and are curved in multiple curvature. The second multiple curvature portion DCA2 may be located at the second corner C2 corresponding to the upper right corner of the curved substrate 10. [

As shown in FIGS. 3 and 4, the third multiple curvature portion DCA3 may be a region where the second curvature portion CA2 and the fourth curvature portion CA4 are superimposed on each other and curved in multiple curvature. The third multi-curvature portion DCA2 may be located at the third corner portion C3 corresponding to the lower left corner of the curved substrate 10.

As shown in FIGS. 3 and 4, the fourth multiple curvature portion DCA4 may be a region where the third curvature portion CA3 and the fourth curvature portion CA4 are superimposed on each other and curved in multiple curvature. The fourth multi-curvature portion DCA4 may be located at the fourth corner C4 corresponding to the lower right corner of the curved substrate 10.

2 to 4, the curved substrate 10 includes four curvature parts CA1 to CA4 and four multi-curvature parts DCA1 to DCA4 for convenience of description. However, the present invention is not limited thereto Do not. That is, the curved substrate 10 may include only at least two curvature portions and one multi-curvature portion formed by superposition thereof.

In addition, the first to fourth curvatures of the curved substrate 10 may be different from each other. Alternatively, the first and fourth curvatures may be equal to each other and the second and third curvatures may be equal to each other. Alternatively, the first and fourth curvatures may be the same, but the second and third curvatures may be different. Alternatively, the second and third curvatures are the same, but the first and fourth curvatures may be different.

A decor layer having a predetermined pattern may be formed on the lower surface of the curved substrate 10. The decor layer may be a layer formed with a pattern that can be displayed to the user even when the flexible display module 30 does not display an image. For example, a company logo or the like may be formed on the decor layer. Alternatively, the decor layer may include a color layer formed in an area corresponding to the bezel area of the flexible display module. For example, the decor layer may include a color layer having a black color. In this case, the color layer of the decor layer may correspond to the display area of the flexible display module 30 when the flexible display module 30 does not display an image Can be expressed in the same color. Therefore, the screen of the flexible display module 30 can be seen to be wide for the user.

The flexible display module 30 may be disposed on the lower surface of the curved substrate 10. [ The flexible display module 30 includes a flat portion FA of the curved substrate 10, first through fourth curvilinear portions CA1 through CA4, and first through fourth curved portions DCA1 through DCA4 As shown in FIG.

The flexible display module 30 is a display device for displaying a predetermined image. For example, the flexible display module 30 may be an organic light emitting display device or a quantum dot light emitting display device, but is not limited thereto. A detailed description of the flexible display module 30 will be given later with reference to FIGS. 5 to 10. FIG.

A heat dissipation layer (40) may be disposed on the lower surface of the flexible display module (30). The heat dissipation layer 40 may include a metal layer having a high thermal conductivity so as to effectively dissipate heat generated from the flexible display module 30. In addition, the heat-radiating layer 40 may include a foam that acts as a buffer to protect the flexible display module 30 from an external impact.

The touch circuit board 60 is attached to the upper surface of the flexible display module 30 and can be bent on the lower surface of the flexible display module 30 and disposed on the lower surface of the heat dissipation layer 40.

As described above, according to the embodiment of the present invention, the flexible display module 30 can be mounted not only on the flat portion FA of the curved substrate 10 and the first to fourth curvature portions CA1 to CA4, To fourth multi-curvature portions DCA1 to DCA4. As a result, the non-display area of the flexible display module 30 can be arranged in the first to fourth multiple curvature parts DCA1 to DCA4. Therefore, the embodiment of the present invention can reduce the distance from the upper end or the lower end of the cover glass CCG to the display area DA of the flexible display module FDP. Therefore, the bezel area of the curved display device ) Can be minimized.

5 is an enlarged bottom view showing the first corner portion of FIG. 4 in detail. 5 is an enlarged bottom view of the first corner portion C1 of the curved substrate 10 in which the first multiple curvature portion DCA1 is located.

5, only the curved substrate 10, the supporting substrate 31 of the display module 30, the heat radiation layer 40, the first adhesive layer 20, and the touch circuit substrate 60 are shown for convenience of explanation . The first adhesive layer 20 is a layer which adheres the display module 30 to the curved substrate 10 and is shown in a dashed line since it is invisible from the bottom view.

5, the curved substrate 10 has a first curvature portion CA1 curved at a first curvature in the y-axis direction from the flat portion FA, a second curvature portion CA1 curved at a second curvature in the x- The first curvature portion CA2 bent at a multiple curvature including the first curvature and the second curvature in the overlap region of the first curvature portion CA1 and the second curvature portion CA2, ). 5 illustrates that the second curvature is larger than the first curvature.

The supporting substrate 31 of the display module 30 is disposed on the lower surface of the curved substrate 10. The support substrate 31 of the display module 30 may be disposed on the flat portion FA, the first curvature portion CA1, the second curvature portion CA2, and the first multiple curvature portion DCA1. The edges of the support substrate 31 and the edges of the flexible substrate 32 (see Figs. 6 and 7) supported by the support substrate 31 may be disposed in the first multiple curvature portion DCA1 as shown in Fig. In this case, in order to prevent the support substrate 31 from interfering with the curved substrate 10, the edges of the support substrate 31 and the flexible substrate 32 are formed in consideration of the multi-curvature of the first multiple curvature portion DCA1 And may be formed in an oblique cut shape. For example, if the second curvature bent in the x-axis direction is larger than the first curvature bent in the y-axis direction as shown in Fig. 5, the cutting length a in the x- ) May be shorter than the cut length (b) in the y-axis direction. In FIG. 5, the edges of the support substrate 31 and the flexible substrate 32 are formed as oblique lines. However, the present invention is not limited to this, and the support substrate 31 and the flexible substrate 32 may be curved (elliptical).

The heat dissipation layer 40 is disposed on the lower surface of the support substrate 31 of the display module 30. [ The heat dissipation layer 40 may be disposed on the flat portion FA, the first curvature portion CA1, the second curvature portion CA2, and the first multiple curvature portion DCA1. The edge of the heat dissipation layer 40 may be disposed in the first multiple curvature portion DCA1 as shown in FIG. The edges of the heat dissipation layer 40 may be formed in a shape that is cut obliquely similarly to the edges of the support substrate 31 and the flexible substrate 32.

The first adhesive layer 20 is disposed between the lower surface of the curved substrate 10 and the upper surface of the display module 30 and adheres the lower surface of the curved substrate 10 to the upper surface of the display module 30. The first adhesive layer 20 may be disposed on the flat portion FA, the first curvature portion CA1, and the second curvature portion CA2. The distance D3 from the first adhesive layer 20 to the end of the curved substrate 10 from the first curvature portion CA1 is smaller than the distance D3 from the first adhesive layer 20 to the first multi- The distance D4 from the curvature portion DCA1 to the end of the curved substrate 10 can be shortened. The distance D5 from the first adhesive layer 20 to the end of the curved substrate 10 from the second curvature portion CA2 is defined as the distance from the first adhesive layer 20 to the first multi- The distance D6 from the portion DCA1 to the end of the curved substrate 10 can be shortened.

Since the first multi-curvature portion DCA1 is bent at a multiple curvature including the first curvature and the second curvature, the first multi-curvature portion DCA1 is bent at the first multi- The first adhesive layer 20 may be overlapped or the like may occur. Therefore, in the embodiment of the present invention, it is preferable that the first adhesive layer 20 is not disposed in the first multiple curvature portion DCA1.

On the other hand, the enlarged bottom view of the second corner portion C2 of the curved substrate 10 on which the second multiple curvature portion DCA2 is located is substantially the same as that shown in Fig. 5 symmetrically with respect to the y-axis. Therefore, an enlarged bottom view of the second corner portion C2 of the curved substrate 10 is omitted.

As described above, according to the embodiment of the present invention, the edges of the support substrate 31 and the flexible substrate 32 of the flexible display module 30 are obliquely cut in consideration of the multiple curvature of the first multiple curvature portion DCA1. . As a result, the embodiment of the present invention can prevent the support substrate 31 from interfering with the curved substrate 10.

6 is a cross-sectional view showing I-I 'of FIG. 7 is a cross-sectional view showing II-II 'of FIG.

6 and 7, a curved display device (CDIS) according to an embodiment of the present invention includes a curved substrate 10, a first adhesive layer 20, a display module 30, a heat dissipation layer 40, A flexible film 50, and a touch circuit board 60. [

Since the curved substrate 10 has been described in detail with reference to FIGS. 2 to 4, detailed description thereof will be omitted.

The flexible display module 30 may be disposed on the lower surface of the curved substrate 10. [ The flexible display module 30 includes a flat portion FA of the curved substrate 10, first through fourth curvilinear portions CA1 through CA4, and first through fourth curved portions DCA1 through DCA4 As shown in FIG.

The flexible display module 30 is a display device for displaying a predetermined image. For example, the flexible display module 30 may be an organic light emitting display device or a quantum dot light emitting display device, but is not limited thereto. Hereinafter, for convenience of explanation, the flexible display module 30 is embodied as an organic light emitting display device.

The display module 30 may include a support substrate 31, a flexible substrate 32, a pixel array layer 33, a barrier film 34, and a polarizing film 35.

The supporting substrate 31 is a substrate for supporting the flexible substrate 32, and may be formed of plastic or glass. For example, the support substrate 31 may be formed of polyethylene terephthalate (PET).

The flexible substrate 32 may be disposed on the upper surface of the supporting substrate 31 and may be formed of a flexible plastic film. For example, the flexible substrate 32 may be formed of a polyimide film.

The pixel array layer 33 may be formed on the upper surface of the flexible substrate 32. The pixel array layer 33 is a layer for displaying an image by a plurality of pixels. The pixel array layer 33 may include a thin film transistor layer, a light emitting element layer, and an encapsulation layer. The pixel array layer of the display module 30 will be described later in detail with reference to FIGS. 8 and 9. FIG.

The barrier film 34 may be arranged to cover the pixel array layer 33 to protect the pixel array layer 33 from oxygen and moisture. That is, the barrier film 34 may be disposed on the pixel array layer 33. The barrier film 34 may include a touch sensing layer for sensing the user's touch.

The polarizing film 35 may be adhered on the upper surface of the barrier film 34 to prevent deterioration of visibility due to external light reflection. The polarizing film 35 may be disposed so as to overlap with the pixel array layer 33.

The first adhesive layer 20 is disposed between the curved substrate 10 and the display module 30 to adhere the curved substrate 10 and the polarizing film 35 of the display module 30. The first adhesive layer 20 may be an optically transparent resin (OCR) or an optically transparent adhesive film (OCA film).

The heat dissipation layer 40 may be disposed on the lower surface of the support substrate 31 of the display module 30. [ The heat dissipation layer 40 may include a metal layer 41 having a high thermal conductivity so as to effectively dissipate heat generated from the flexible display module 30. For example, the metal layer 41 may be copper (Cu), aluminum (Al), or aluminum nitride (AlN). In addition, the heat-radiating layer 40 may include a foam 42 serving as a buffer to protect the display module 30 from an external impact. When the heat dissipation layer 40 includes the metal layer 41 and the foam 42, the foam 42 is disposed on the lower surface of the support substrate 31 and the metal layer 41 is disposed on the lower surface of the foam 42 .

The flexible film 50 may be a chip on film (COF) for mounting the driving IC 51. The driving IC 51 may be a source driver IC for supplying driving signals to the data lines of the pixel array layer 33. [

The flexible film 50 may be attached in a bent form as shown in Fig. One side of the flexible film 50 is attached to the upper surface of the flexible substrate 32 through the first anisotropic conductive film 71 and the other side is attached to the heat dissipation layer 40 ) On the lower surface of the metal layer 41. Specifically, one side of the flexible film 50 may be attached on the pads provided on the upper surface of the flexible substrate 32 that is not covered with the barrier film 34. The pads provided on the upper surface of the flexible substrate 32 are connected to the data lines of the pixel array layer 33 so that the driving signals of the source drive IC are transmitted through the flexible film 50 and the pads, Lt; / RTI > lines.

The touch circuit board 60 may include a touch sensing circuit 61 for supplying touch signals to the touch sensing layer of the barrier film 34 and for sensing a touch input of the user. The touch circuit board 60 may be a flexible printed circuit board having flexibility.

The touch circuit board 60 may be attached in a bent shape as shown in FIG. One side of the touch circuit board 60 is attached to the upper surface of the barrier film 34 by using the second anisotropic conductive film 92 and the other side of the flexible circuit film 50 As shown in Fig. Specifically, one side of the touch circuit substrate 60 may be attached on the pads provided on the upper surface of the barrier film 34 not covered by the polarizing film 35. Since the pads provided on the upper surface of the barrier film 34 are connected to the touch sensing layer of the barrier film 34, the touch signals of the touch sensing circuit 61 of the touch circuit board 60 are electrically connected to the touch circuit board 60, To the touch sensing layer of the barrier film 34.

On the other hand, the first adhesive layer 20 may cover one side of the touch circuit substrate 60 attached on the upper surface of the barrier film 34. In this case, since one side of the touch circuit board 60 attached on the upper surface of the barrier film 34 is fixed by the first adhesive layer 20, It is possible to prevent the one side of the touch circuit board 60 from being unstucked from the barrier film 34 even if an external force is applied to the attachment region.

The upper surface or the lower surface of the other side of the flexible film 50 can be attached to the main circuit board on which the control circuit is mounted using the anisotropic conductive film. The upper surface or the lower surface of the other side of the touch circuit board 60 may be attached to the main circuit board through an adhesive layer. The main circuit board can be attached and fixed to the lower surface of the metal layer 41 of the heat dissipation layer 40. [ The main circuit board may be a flexible printed circuit board or a printed circuit board having flexibility.

7, a point corresponding to the boundary BD of the first multiple curvature portion DCA1 on the lower surface of the curved substrate 10 is denoted by A, and a point corresponding to the boundary BD on the flexible substrate 32 is denoted by A B, and a point corresponding to the curved substrate 10 closest to the flexible substrate 32 is denoted by C, a triangle can be formed by connecting A, B, and C together. In this case, assuming that the distance from A to B is X, the distance from B to C is Y, and the angle at C is θ, X is the thickness from the flexible substrate 32 to the curved substrate 10, The length Y1 from the first multiple curvature portion DCA1 to the end of the flexible substrate 32 and the distance Y2 between the end of the flexible substrate 32 and the curved substrate 10 can be considered. Therefore, when the flexible substrate 32 contacts the curved substrate 10, the length of the flexible substrate 32 contacting the curved substrate 10 in the first multiple curved portion DCA1 is Y . X, Y, and? Can be defined as shown in Equation (1).

The length of the flexible substrate 32 at the first multiple curvature portion CA1 is calculated by Equation 1 so that the flexible substrate 32 does not interfere with the curved substrate 10 at the first multiple curvature portion CA1 Gt; Y < / RTI > That is, the edge of the flexible substrate 32 can be cut obliquely as shown in FIG. 5 according to Y calculated by Equation (1).

On the other hand, when the length Y1 of the flexible substrate 32 in the first multiple curvature portion CA1 is Y, the flexible substrate 32 can contact the curved substrate 10, and in this case, A buffer member for protecting the flexible substrate 32 from the flexible substrate 32 can be formed on the side surface of the flexible substrate 32. [

As described above, according to the embodiment of the present invention, depending on the thickness from the flexible substrate 32 to the curved substrate 10, the first curved portion CA1 may not interfere with the curved substrate 10 The length of the flexible substrate 32 can be calculated. As a result, in the embodiment of the present invention, the edge of the flexible substrate 32 is obliquely cut according to the calculated length of the flexible substrate 32, thereby preventing the flexible substrate 32 from interfering with the curved substrate 10 can do.

FIG. 8 is a cross-sectional view showing an example of the flexible display module of FIGS. 6 and 7. FIG. 9 is a cross-sectional view showing the display area of the flexible display module of FIG. 8 in detail.

8 and 9, the display module 30 is embodied as an OLED display. In FIGS. 8 and 9, the light emitting device layer 120 is formed in the upper light emitting mode in which the barrier film 34 is disposed, that is, the upper light emitting mode.

8 and 9, the display area AA indicates a region where the light emitting device layer 120 is formed to display an image, and the non-display area NAA indicates a peripheral area of the display area.

The display module 30 includes a pixel array layer 33 including a support substrate 31, a flexible substrate 32, a thin film transistor layer 110, a light emitting element layer 120 and an encapsulation layer 130, a barrier film 34, and a polarizing film 35.

The supporting substrate 31, the flexible substrate 32, the barrier film 34, and the polarizing film 35 have been described in detail with reference to FIGS. 2 and 3, and a detailed description thereof will be omitted.

On the flexible substrate 32, a thin film transistor layer 110 is formed. The thin film transistor layer 110 includes thin film transistors 210, a gate insulating film 220, an interlayer insulating film 230, a protective film 240, and a planarizing film 250.

A buffer film may be formed on the flexible substrate 32. The buffer film may be formed on the flexible substrate 32 to protect the thin film transistors 210 and the light emitting devices from moisture penetrating through the flexible substrate 32 and the supporting substrate 31 susceptible to moisture permeation. The buffer film may be composed of a plurality of stacked inorganic films. For example, the buffer film may be formed of multiple films in which one or more inorganic films of a silicon oxide film (SiO _x ), a silicon nitride film (SiN _x ), and SiON are alternately stacked. The buffer film may be omitted.

A thin film transistor 210 is formed on the buffer film. The thin film transistor 210 includes an active layer 211, a gate electrode 212, a source electrode 213 and a drain electrode 214. 5 illustrates that the TFT 210 is formed in a top gate structure in which the gate electrode 212 is located on the active layer 211. However, the present invention is not limited thereto. That is, the thin film transistors 210 may be formed by a bottom gate method in which the gate electrode 212 is located under the active layer 211 or a bottom gate method in which the gate electrode 212 is formed on the upper and lower portions of the active layer 211, And may be formed in a double gate manner.

An active layer 211 is formed on the buffer film. The active layer 211 may be formed of a silicon-based semiconductor material or an oxide-based semiconductor material. A light shielding layer for shielding external light incident on the active layer 211 may be formed between the buffer layer and the active layer 211. [

A gate insulating layer 220 may be formed on the active layer 211. The gate insulating film 220 may be formed of an inorganic film, for example, a silicon oxide film (SiO _x ), a silicon nitride film (SiN _x ), or a multilayer film thereof.

A gate electrode 212 and a gate line may be formed on the gate insulating layer 220. The gate electrode 212 and the gate line may be formed of any one of Mo, Al, Cr, Au, Ti, Ni, Ne, Or a single layer or multiple layers of one or more of these alloys.

An interlayer insulating film 230 may be formed on the gate electrode 212 and the gate line. The interlayer insulating film 230 may be formed of an inorganic film, for example, a silicon oxide film (SiO _x ), a silicon nitride film (SiN _x ), or a multilayer film thereof.

A source electrode 213, a drain electrode 214, and a data line may be formed on the interlayer insulating film 230. Each of the source electrode 213 and the drain electrode 214 may be connected to the active layer 211 through a contact hole passing through the gate insulating film 220 and the interlayer insulating film 230. The source electrode 213, the drain electrode 214 and the data line may be formed of a metal such as molybdenum (Mo), aluminum (Al), chrome (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium And copper (Cu), or an alloy thereof.

A protective film 240 for insulating the thin film transistor 220 may be formed on the source electrode 223, the drain electrode 224, and the data line. The protective film 240 may be formed of an inorganic film, for example, a silicon oxide film (SiO _x ), a silicon nitride film (SiN _x ), or a multilayer thereof.

The planarization layer 250 may be formed on the passivation layer 240 to flatten a step due to the thin film transistor 210. The planarization layer 250 may be formed of an organic layer such as an acryl resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin. have.

The light emitting device layer 120 is formed on the thin film transistor layer 110. The emissive element layer 120 includes light emitting elements and banks 264.

The light emitting elements and the banks 264 are formed on the planarization film 250. The light emitting device may include a first electrode 261, a light emitting layer 262, and a second electrode 263. The first electrode 261 may be an anode electrode, and the second electrode 263 may be a cathode electrode.

The first electrode 261 may be formed on the planarization layer 250. The first electrode 261 may be connected to the source electrode 213 of the thin film transistor 210 through the contact hole passing through the protective film 240 and the planarization film 250. The first electrode 261 is formed of a laminated structure of aluminum and titanium (Ti / Al / Ti), a laminated structure of aluminum and ITO (ITO / Al / ITO), an APC alloy, / ITO). ≪ / RTI > The APC alloy is an alloy of silver (Ag), palladium (Pd), and copper (Cu).

The bank 264 may be formed to cover the edge of the first electrode 261 on the planarizing film 250 to partition the pixels. That is, the bank 264 serves as a pixel defining layer for defining pixels.

Each of the pixels includes a first electrode 261 corresponding to the anode electrode, a light emitting layer 262, and a second electrode 263 corresponding to the cathode electrode sequentially laminated on the first electrode 261 and the second electrode 261, And the electrons from the electrode 263 are combined with each other in the light emitting layer 262 to emit light.

A light emitting layer 262 is formed on the first electrode 261 and the bank 264. The light emitting layer 262 may be an organic light emitting layer. In this case, the light emitting layer 262 is a common layer formed commonly to the pixels, and may be a white light emitting layer that emits white light. The light emitting layer 262 may be formed in a tandem structure of two stacks or more. Each of the stacks may include a hole transporting layer, at least one light emitting layer, and an electron transporting layer.

Further, when the light emitting layer 262 is formed in a tandem structure of two stacks or more, a charge generating layer may be formed between the stacks. The charge generation layer may include an n-type charge generation layer located adjacent to the bottom stack and a p-type charge generation layer formed on the n-type charge generation layer and located adjacent to the top stack. The n-type charge generation layer injects electrons into the lower stack, and the p-type charge generation layer injects holes into the upper stack. The n-type charge generation layer may be an organic layer doped with an alkali metal such as Li, Na, K, or Cs, or an alkaline earth metal such as Mg, Sr, Ba, or Ra to an organic host material having electron transporting ability. The p-type charge generating layer may be an organic layer doped with an organic host material capable of hole transporting.

The second electrode 263 is formed on the light emitting layer 262. The second electrode 263 may be formed to cover the light emitting layer 262. The second electrode 263 may be a common layer formed commonly to the pixels.

The second electrode 263 may be formed of a transparent conductive material such as ITO or IZO or a transparent conductive material such as magnesium (Mg), silver (Ag), or magnesium (Mg) (Semi-transmissive Conductive Material). When the second electrode 140 is formed of a semitransparent metal material, the efficiency of outgoing light can be enhanced by a microcavity. A capping layer may be formed on the second electrode 263.

An encapsulation layer 130 is formed on the light emitting device layer 120. The sealing layer 130 includes a sealing film 270.

The sealing film 270 serves to prevent oxygen or moisture from permeating the light emitting layer 262 and the second electrode 263. To this end, the encapsulation film 270 may comprise at least one inorganic film. The inorganic film may be formed of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, or titanium oxide.

In addition, the sealing film 270 may further include at least one organic film. The organic layer may be formed to a sufficient thickness to prevent particles from penetrating the sealing film 270 and being injected into the light emitting layer 262 and the second electrode 263.

A color filter layer may be formed on the sealing layer 130. The color filter layer includes color filters and a black matrix. Each of the color filters may be arranged in correspondence with the pixels. The black matrix 294 may be disposed between the color filters to prevent color mixing from occurring as the light of one pixel travels to the color filters of adjacent pixels. The black matrix 294 may be disposed in correspondence with the bank 264. An overcoat layer may be formed on the color filters to flatten the step due to the color filters and the black matrix.

FIG. 10 is an enlarged bottom view showing the fourth corner portion of FIG. 4 in detail.

FIG. 10 shows an enlarged bottom view of the fourth corner portion C4 of the curved substrate 10 where the fourth multiple curvature portion DCA4 is located.

10, only the curved substrate 10, the supporting substrate 31 of the display module 30, the heat dissipation layer 40, and the first adhesive layer 20 are shown for convenience of explanation. The first adhesive layer 20 is a layer which adheres the display module 30 to the curved substrate 10 and is shown in a dashed line since it is invisible from the bottom view.

Since the curved substrate 10, the supporting substrate 31 of the display module 30, the heat dissipation layer 40, and the display substrate 30 shown in Fig. 10 are substantially the same as those of Fig. And the first adhesive layer 20 will be omitted.

In addition, the enlarged bottom view of the third corner portion C3 of the curved substrate 10 on which the third multiple curvature portion DCA3 is located is substantially the same as that shown in Fig. 10 symmetrically with respect to the y-axis. Therefore, the enlarged bottom view of the third corner portion C3 of the curved substrate 10 is omitted.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

10: curved substrate 20: first adhesive layer
30: display module 31: support substrate
32: flexible substrate 33: pixel array layer
34: Barrier film 35: Polarizing film
40: heat dissipation layer 41: metal layer
42: Foam 50: Flexible film
51: driving IC 60: touch circuit board
61: touch sensing circuit 71: first anisotropic conductive film
72: second anisotropic conductive film 73: second adhesive layer
74: third adhesive layer FL: flat part
CA1: first curvature portion CA2: second curvature portion
CA3: third curvature portion CA4: fourth curvature portion
DCA1: first multi-curvature portion DCA2: second multi-
DCA3: third multi-curvature portion DCA4: fourth multi-
C1: first corner portion C2: second corner portion
C3: third corner part C4: fourth corner part

Claims (10)

A first curvature portion extending in a first direction from the first side of the flat portion and bent at a first curvature, a second curvature portion extending in a second direction from the second side of the flat portion and bent at a second curvature, A curved substrate including a first curvature portion and a second curvature portion overlapping the first curvature portion and the second curvature portion; And
And a display module disposed on a lower surface of the curved substrate and including a pixel array layer disposed on the substrate,
And a corner of the substrate is disposed in the multi-curvature portion. The method according to claim 1,
Further comprising a first adhesive layer for bonding the curved substrate and the substrate,
The distance from the first adhesive layer to the end of the curved substrate from the first curvature portion is shorter than the distance from the first adhesive layer to the end of the curved substrate in the multiple curvature portion And the curved surface display device. 3. The method of claim 2,
The distance from the first adhesive layer to the end of the curved substrate is shorter than the distance from the first adhesive layer to the end of the curved substrate from the multiple curvature portion And the curved surface display device. The method according to claim 1,
Wherein the substrate includes a flexible substrate and a supporting substrate for supporting the flexible substrate. 5. The method of claim 4,
Wherein the edge of the flexible substrate and the edge of the supporting substrate disposed in the multi-curvature portion are obliquely cut or curved. 6. The method of claim 5,
Wherein a cut length in a second direction of a corner of the flexible substrate is shorter than a cut length in the first direction when the second curvature is larger than the first curvature. 5. The method of claim 4,
Further comprising a heat dissipation substrate disposed on a lower surface of the support substrate,
And a corner of the heat dissipation substrate is disposed in the multi-curvature portion. 8. The method of claim 7,
Wherein the edge of the heat dissipation substrate disposed in the multi-curvature portion is obliquely cut or curved. The method according to claim 1,
The display module includes:
A barrier film covering the pixel array layer; And
And a polarizing plate disposed on the barrier film. 10. The method of claim 9,
A flexible film attached to a non-display area around the pixel array layer on the substrate; And
And a flexible circuit board attached to the barrier film.

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