KR20190069075A - Flexible display device - Google Patents

Abstract

The present invention relates to a flexible display device having enhanced adhesion between a protective member and an intermediate substrate. In addition, the present invention relates to the flexible display device that a boundary line of a bending area it not viewed, a thickness of the bending area and a thickness of a region other than the bending region are same, and a manufacturing process is simplified. The flexible display device according to the present invention comprises: a protective member; an integrated intermediate substrate disposed on the protective member; and a display panel disposed on the integrated intermediate substrate and displaying an image. According to another embodiment of the present invention, the integrated intermediate substrate includes a first pattern provided to protrude at a lower surface and having the rigidity and a gap filling adhesive member disposed on the protective member and provided integrally on a lower surface of the first pattern.

Description

[0001] FLEXIBLE DISPLAY DEVICE [0002]

The present application relates to a flexible display device.

2. Description of the Related Art In recent years, the importance of display devices has been increasing with the development of multimedia. Various types of flat panel display devices such as a liquid crystal display device, a plasma display device, and an organic light emitting display device have been commercialized in response to this.

Among the flat panel display devices, organic light emitting display devices are widely used as display devices for notebook computers, televisions, tablet computers, monitors, smart phones, portable display devices, and portable information devices due to their excellent characteristics such as thinness, light weight and low power consumption .

Recently, a flexible display device has been developed. The flexible display device can bend or bend the substrate for user's convenience. The flexible display device can bend or bend in both the display area for displaying an image and the non-display area surrounding the display area, so that various types of images can be realized.

In the flexible display device, a middle frame (M / F) is disposed below the display panel so that the display panel maintains a minimum shape. In addition, the flexible display device may provide a pattern on the bending region in the lower surface of the intermediate substrate to increase the degree of bending in the bending region of the display panel.

However, when a pattern is provided on the intermediate substrate, the area of adhesion between the intermediate substrate and the protective member disposed under the intermediate substrate is reduced by the pattern. When the area of adhesion between the protective member and the intermediate substrate is reduced, the adhesive force between the protective member and the intermediate substrate is weakened, and the protective member and the intermediate substrate are separated from each other. Further, when a pattern is selectively formed on the bending area of the intermediate substrate, the boundary line of the bending area can be recognized, the thickness of the bending area is different from the thickness of the bending area, and the manufacturing process becomes complicated.

Accordingly, the present inventors have recognized the above-mentioned problem and invented a flexible display device in which the boundary line of the bending area is not recognized.

The present application is intended to provide a flexible display device having enhanced adhesion between a protective member and an intermediate substrate.

In addition, the present application aims to provide a flexible display device in which the boundary line of the bending region is not recognized, the thickness of the bending region is the same as the thickness of the bending region, and the manufacturing process is simplified.

The flexible display device according to the present application includes a protective member, an integrated intermediate substrate disposed on the upper portion of the protective member, and a display panel disposed above the integrated intermediate substrate and displaying an image. According to another example, the integrated intermediate substrate includes a first pattern having a rigidity and a gap filling adhesive member disposed on an upper surface of the protection member and provided integrally on a lower surface of the first pattern.

The flexible display device according to the present application increases the adhesion surface between the protective member and the first pattern by using a gap-filling adhesive member. Accordingly, the flexible display device according to another example can enhance the adhesion between the protective member and the integrated intermediate substrate.

Further, in the flexible display device according to the present application, the boundary line of the bending area is not visible, and the thickness of the bending area is the same as the thickness of the bending area, so that the manufacturing process can be simplified.

1 is a perspective view of a flexible display device according to an example of the present application.
2 is a block diagram of a flexible display device according to an example of the present application.
3 is a cross-sectional view of a flexible display device according to an example of the present application.
4 is a cross-sectional view showing an intermediate substrate in detail according to an example of the present application.
5A to 5C are plan views showing first and second patterns of a flexible display device according to an example of the present application.
6 is a cross-sectional view of a flexible display device according to another example of the present application.
7A to 7C are plan views showing a gap filling adhesive member and a first pattern of an integrated intermediate substrate according to another example of the present application.

Brief Description of the Drawings The advantages and features of the present application, and how to accomplish them, will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. It should be understood, however, that this application is not limited to the examples disclosed herein, but may be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein, To fully disclose the scope of the invention to those skilled in the art, and this application is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like described in the drawings for describing an example of the present application are illustrative, and thus the present application is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the description of the present application, a detailed description of known related arts will be omitted if it is determined that the gist of the present application may be unnecessarily obscured.

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. Accordingly, the first component mentioned below may be the second component within the scope of the present application.

The terms "first horizontal axis direction "," second horizontal axis direction ", and "vertical axis direction" should not be interpreted solely by the geometric relationship in which the relationship between them is vertical, It may mean having a wider directionality in the inside.

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.

Each of the features of the various embodiments of the present application may be combined or combined with each other partially or entirely, technically various interlocking and driving are possible, and the examples may be independently performed with respect to each other, .

Hereinafter, preferred examples of the flexible display device according to the present application will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings.

1 is a perspective view of a flexible display device 100 according to an example of the present application. The flexible display device 100 according to an example of the present application includes a display area DA, a non-display area NDA, and a bending area FDA.

The flexible display device 100 according to the present application can be implemented as an organic light emitting display. However, the present invention is not limited to this, and the flexible display device 100 according to the present application can be applied to a quantum dot display device, a micro light emitting diode (μ-LED) display device, and the like.

The display area DA is provided on the front surface of the flexible display device 100. The display area DA is an area for displaying an image. Pixels are provided in the display area DA to display an image.

The non-display area NDA is disposed on the outer periphery of the display area DA so as to surround the display area DA. The non-display area NDA is provided with circuits for supplying driving signals and driving voltages for displaying an image in the display area DA.

The bending area FDA is defined in the display area DA and the non-display area NDA. The bending area FDA defines the area where the flexible display device 100 is bent or bent. The bending area FDA is an area where the flexible display device 100 can be folded or bent. The bending area FDA may be formed across the display area DA and the non-display area NDA. The bending area FDA may be formed from one side edge to the other side edge of the flexible display device 100 when the flexible display device 100 is folded or bent. In this case, the bending area FDA extends from the outer boundary of the non-display area NDA and is formed so as to traverse from one side of the display area DA to the other side.

For example, when bending the central portion of the flexible display device 100, the bending area FDA may be formed to intersect the central part of the display area DA and the non-display area NDA.

In the bending area FDA, the flexible display device 100 can be bent in the Z-axis direction in the height direction, folded to have a predetermined curvature, or folded to have a predetermined tilt angle. When the flexible display device 100 is bent in the z-axis direction in the bending area FDA, an image can be displayed in a state in which the display area DA protrudes in the height direction. When the flexible display device 100 is folded to have a predetermined curvature in the bending area FDA, the display area DA can be kept folded inward. When the flexible display device 100 is folded at a predetermined inclination angle in the bending area FDA, an image can be displayed while maintaining the display area DA at a predetermined inclination. Accordingly, the flexible display device 100 according to one example can realize various types of images and stereoscopic images as compared with the flat display device.

2 is a block diagram of a flexible display device 100 according to an example of the present application. The flexible display device 100 according to an example of the present application includes a display area DA, a timing controller 10, a data driving circuit part 20, and a gate driving circuit part 30. The timing controller 10, the data driving circuit portion 20 and the gate driving circuit portion 30 may be formed in a single unit (not shown) mounted in an area outside the display area DA of the OLED display device And can be implemented as a driver integrated circuit (Driver IC) as a driving chip.

In the display area DA, scan lines SL1 to SLp for supplying scan signals, p is a positive integer of 2 or more, data lines DL1 to DLq for supplying data voltages, q is a positive integer of 2 or more, And driving power supply lines RL1 to RLq for supplying driving power. The data lines DL1 to DLq and the driving power lines RL1 to RLq may intersect the scan lines SL1 to SLp. The data lines DL1 to DLq and the driving power lines RL1 to RLq may be parallel to each other. The display area DA may include a lower substrate on which pixels P are provided and an upper substrate on which an encapsulation function is performed.

Each of the pixels P may be connected to any one of the scan lines SL1 to SLp and one of the data lines DL1 to DLq and one of the drive power lines RL1 to RLq have. Each of the pixels P may include an organic light emitting diode (OLED) and a pixel circuit for supplying current to the organic light emitting diode OLED.

The timing controller 10 generates digital video data (DATA) for implementing an image in the organic light emitting display and timing signals for controlling timing for driving the organic light emitting display. The timing signal includes a vertical sync signal, a horizontal sync signal, a data enable signal, and a dot clock.

The timing controller 10 includes a data control signal DCS for controlling the operation timing of the data driving circuit portion 20 using the timing signals and a scan control signal SCS for controlling the operation timing of the gate driving circuit portion 30. [ . The timing controller 10 outputs the digital video data DATA and the data control signal DCS to the data driving circuit unit 20. [ The timing controller 10 outputs a scan control signal SCS to the gate drive circuit 30. [

The data driving circuit unit 20 receives the data control signal DCS from the timing controller 10. [ The data driving circuit portion 20 generates data voltages based on the data control signal DCS. The data driving circuit unit 20 supplies the data voltages to the data lines DL1 to DLq.

The gate drive circuit unit 30 receives the scan control signal SCS from the timing controller 10. [ The gate drive circuit unit 30 generates scan signals based on the scan control signal SCS. The gate driving circuit unit 30 supplies scan signals to the scan lines SL1 to SLp.

As described above, the timing controller 10, the data driving circuit portion 20, and the gate driving circuit portion 30 are mounted in an area outside the display area DA of the organic light emitting display device. At this time, the timing controller 10, the data driving circuit portion 20, and the gate driving circuit portion 30 are driven by a gate drive in panel (GIP) method, which is an external region surrounding the display region DA And can be mounted on the display area NDA.

The data driver circuit portion 20 and the driver IC mounting the gate driver circuit portion 30 may be connected to the flexible printed circuit board (FPCB). The flexible printed circuit board may be attached to the interior, front and back edge regions of the OLED display.

In this case, the timing controller 10 can be mounted on the flexible printed circuit board and the data control signal DCS and the scan control signal SCS can be transferred to the driver IC on the control printed circuit board . The flexible printed circuit board is arranged in the folded state in the edge area inside the organic light emitting display. Therefore, the flexible printed circuit board can be mounted without providing a separate space inside the OLED display. In addition, when the timing controller 10 is mounted on the flexible printed circuit board, the functions performed in the circuit inside the driving integrated circuit can be reduced, and the size of the driving integrated circuit can be reduced.

3 is a cross-sectional view of a flexible display device 100 according to an example of the present application. The flexible display device 100 according to an example of the present application includes a protective member (or a set) 110, a first bonding member 120, an intermediate substrate 130, a second bonding member 140, a flexible substrate 150, a third adhesive member 160, and a display panel 170.

The protective member 110 is disposed at the lowermost end. The protective member 110 forms the lower surface of the flexible display device 100. [ The protective member 110 protects the top layers and circuit elements from external impact.

The first adhesive member 120 is disposed on the top of the protective member 110. The first adhesive member 120 may be disposed on a part of the upper surface of the protective member 110. In one example, the first adhesive member 120 may be disposed on a region of the upper portion of the protective member 110 except for the bending region. The first adhesive member 120 may be made of, for example, a transparent adhesive such as OCR (Optical Clear Resin) or OCA (Optical Clear Adhesive), but is not limited thereto. The first adhesive member 120 attaches the protective member 110 and the intermediate substrate 130 together.

The intermediate substrate 130 is disposed on top of the protective member 110 and the first adhesive member 120. The intermediate substrate 130 serves to support the flexible display device 100 in a basic form. At the same time, the intermediate substrate 130 plays a role of imparting flexibility so that the flexible display device 100 can bend. The intermediate substrate 130 may have a thickness of 0.18 mm or more and 0.22 mm or less.

The second adhesive member 140 is disposed on the upper portion of the intermediate substrate 130. The second adhesive member 140 can be uniformly disposed over the entire area of the upper surface of the protective member 130. The second adhesive member 140 may be made of, for example, a transparent adhesive such as OCR (Optical Clear Resin) or OCA (Optical Clear Adhesive), but is not limited thereto. The second adhesive member 140 adheres the intermediate substrate 130 and the flexible substrate 150. The second adhesive member 140 may have a thickness of 9 占 퐉 or more and 11 占 퐉 or less.

The flexible substrate 150 is disposed on the upper side of the second adhesive member 140. The flexible substrate 150 can be uniformly disposed over the entire area of the upper surface of the second adhesive member 140. [ The flexible substrate 150 may be made of a highly flexible polymer material such as polyurethane (PU). The flexible substrate 150 may have a thickness of from 28 占 퐉 to 32 占 퐉.

The third adhesive member 160 is disposed on the upper portion of the flexible substrate 150. The third adhesive member 160 can be uniformly disposed on the entire upper surface of the flexible substrate 150. [ The third adhesive member 160 may be made of a transparent adhesive such as OCR (Optical Clear Resin) or OCA (Optical Clear Adhesive), but is not limited thereto. The third adhesive member 160 attaches the flexible substrate 150 and the display panel 170.

The display panel 170 is disposed on the upper side of the third adhesive member 160. The display panel 170 displays an image. The display panel 170 includes a thin film transistor substrate constituting the pixel P.

4 is a cross-sectional view showing the intermediate substrate 130 in detail according to an example of the present application. The intermediate substrate 130 includes first and second patterns 131 and 132 and a surface film 133.

The first pattern 131 is disposed in a part of the lower surface of the intermediate substrate 130. The first pattern 131 is less flexible and has rigidity. The first pattern 131 may be formed of a material having a hardness. For example, the first pattern 131 may be made of steel such as SUS301. SUS301 is one of the stainless steel types, and it is relatively easy to process thin plates without breaking or breaking even with high rigidity. SUS301 is formed by mixing carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), nickel (Ni), and chromium (Cr) can do. The first pattern 131 is patterned through an etching process. The height of one patterned first pattern 131 may be 0.18 mm or more and 0.22 mm or less. The width of the first pattern 131 may be 0.301 mm or more and 1.017 mm or less. The length of the first pattern 131 may be 0.301 mm or more and 1.017 mm or less. The interval between the first patterns 131 may be 0.301 mm or more and 1.017 mm or less.

The second pattern 132 is disposed in a remaining region of the lower surface of the intermediate substrate 130 where the first pattern 131 is not disposed. The second pattern 132 has high flexibility and ductility. The second pattern 132 may be formed of a flexible material. For example, the second pattern 132 may be formed of silicon (Si) or the like. The second pattern 132 is patterned through a screen printing process. The height of the second pattern 132 is lower than the height of the first pattern 131. When the height of the second pattern 132 is lower than the height of the first pattern 131, the second pattern 132 can be folded more naturally due to the second pattern 132.

In order to improve the bending ability, the lower surface and the upper surface of the second pattern 132 may be arranged so as not to coincide with the lower surface and the upper surface of the first pattern 131. For example, the second pattern 132 may be disposed on an intermediate region of the first pattern 131 with respect to the height. Accordingly, the height of the lower surface of the second pattern 132 may be higher than the height of the lower surface of the first pattern 131. The height of the upper surface of the second pattern 132 may be lower than the height of the upper surface of the first pattern 131. In this case, the second pattern 132 and the lower surface of the intermediate substrate 130 are not in direct contact with each other and can have a predetermined gap, so that the strength of the intermediate substrate 130 against bending can be increased.

The surface film 133 is disposed on top of the first and second patterns 131 and 132. The surface film 133 is integrally disposed on the upper portions of the first and second patterns 131 and 132. When the height of the upper surface of the second pattern 132 is lower than the height of the upper surface of the first pattern 132, the surface film 133 contacts the upper surface of the first pattern 131, And may be spaced apart from the upper surface. The surface film 133 allows the upper surface of the first and second patterns 131 and 132 to be fixed at a fixed position without flowing.

5A to 5C are plan views showing the first and second patterns 131 and 132 of the flexible display device 100 according to an example of the present application.

5A to 5C, the flexible display device 100 according to an example has a bending area FDA. For example, the bending area FDA may be provided to cross the central portion of the flexible display device 100. [

The first and second patterns 131 and 132 may be disposed only on the bending area FDA. For example, the plurality of first and second patterns 131 and 132 may be arranged in parallel in the first direction Y on the bending region FDA as shown in FIG. 5A. Each of the first and second patterns 131 and 132 may extend in a second direction X. [

The first and second patterns 131 and 132 may be arranged at different densities in regions other than the bending region FDA and the bending region FDA. For example, the plurality of first and second patterns 131 and 132 are arranged in a higher density on the bending area FDA as shown in FIG. 5B and the density is higher than the bending area FDA in the area other than the bending area FDA Can be placed lower. At this time, the densities of the first and second patterns 131 and 132 are constant on the bending area FDA. In addition, the density of the first and second patterns 131 and 132 in the region other than the bending region FDA is constant.

The first and second patterns 131 and 132 may be arranged at different densities in regions other than the bending region FDA. For example, the first and second patterns 131 and 132 may be arranged in a higher density in the upper and lower edge regions than in the bending region FDA and may be arranged in a lower density in the bending region FDA have.

The bending ability is added to the bending area FDA by arranging the first and second patterns 131 and 132 differently so that the flexible display device 100 can maintain a constant shape in an area other than the bending area FDA .

6 is a cross-sectional view of a flexible display device 100 according to another example of the present application. The flexible display device 100 according to another example of the present application includes a protective member 110, an integrated intermediate substrate 180, a second adhesive member 140, a flexible substrate 150, a third adhesive member 160, And a display panel 170. The description of the protective member 110, the second adhesive member 140, the flexible substrate 150, the third adhesive member 160, and the display panel 170 is the same as that described with reference to FIG. 4, .

The integrated intermediate substrate 180 is disposed on top of the protective member 110. The integrated intermediate substrate 180 is disposed under the second adhesive member 140. The integrated intermediate substrate 180 includes a gap-filling adhesive member 121, a first pattern 131, and a surface film 133.

The gap-filling adhesive member 121 is disposed on the upper side of the protective member 110. The gap filling adhesive member 121 is provided on the lower surface of the first pattern 131. The gap filling adhesive member 121 is integrally connected between the lower surfaces of the adjacent first patterns 131. The gap filling adhesive member 121 is formed so as to fill the space between the adjacent first patterns 131 without any gap.

The first pattern 131 is provided on the lower surface of the integrated intermediate substrate 180. The first pattern 131 protrudes from the lower surface of the integrated intermediate substrate 180. In the first pattern 131, the first pattern 131 is disposed in a part of the lower surface of the intermediate substrate 130. The first pattern 131 is less flexible and has rigidity. The first pattern 131 may be formed of a material having a hardness. For example, the first pattern 131 may be made of steel such as SUS301. SUS301 is one of the stainless steel types, and it is relatively easy to process thin plates without breaking or breaking even with high rigidity. SUS301 is formed by mixing carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), nickel (Ni), and chromium (Cr) can do. The first pattern 131 is patterned through an etching process. The height of one patterned first pattern 131 may be 0.18 mm or more and 0.22 mm or less.

The width of the first pattern 131 may be 0.1 mm or more and 0.3 mm or less. The length of the first pattern 131 may be 0.1 mm or more and 0.3 mm or less. The interval between the first patterns 131 may be 0.1 mm or more and 0.3 mm or less. The size of the first pattern 131 according to another example of the present application is smaller than the size of the first pattern 131 according to an example of the present application.

The surface film 133 is disposed on the upper portion of the integrated intermediate substrate 180. The surface film 133 is integrally disposed on the upper portion of the first pattern 131. The gap filling adhesive member 121 is formed so as to fill the gap between the first patterns 131 so that the surface film 133 is in contact with the upper surface of the first pattern 131, (Not shown).

The flexible display device 100 according to another example includes a protective member 110, an integrated intermediate substrate 180 disposed on the upper portion of the protective member 110, And a display panel 170.

The integrated intermediate substrate 180 according to another example is provided on the lower surface of the first pattern 131 and is provided on the lower surface of the first pattern 131 and the lower surface of the lower surface of the first pattern 131, And a peeling adhesive member 121. The gap filling adhesive member 121 increases the adhesive force in the region between the first pattern 131 and the protection member 110. [ Further, in the case of having the gap-filling adhesive member 121, the adhesion surface between the protection member 110 and the first pattern 131 increases. Accordingly, the flexible display device 100 according to another example can enhance the adhesion between the protection member 110 and the integrated intermediate substrate 180.

The gap filling adhesive member 121 according to another example partly fills an area between the first patterns 131. [ The gap-filling adhesive member 121 covers at least a part of the side surface of the first pattern 131. The adhesive force between the area between the first patterns 131 and the protection member 110 can be enhanced when the gap filling adhesive member 121 is formed to fill at least a part of the area between the first patterns 131. [ Further, when the gap-filling adhesive member 121 covers at least a part of the side surface of the first pattern 131, the adhesion surface between the protection member 110 and the first pattern 131 further increases.

The first pattern 131 according to another example is formed with a uniform size and a uniform spacing in the entire display area DA and the non-display area NDA from the lower surface of the integrated intermediate substrate 180. The first pattern 131 is formed with a uniform size and a uniform spacing in regions other than the bending region FDA and the bending region FDA. The first pattern 131 has a full-pattern structure formed without distinguishing regions other than the bending region FDA and the bending region FDA. The flexible display device 100 according to another example does not have a separate bending area FDA and has uniform flexibility in the entire area.

When the first patterns 131 are formed with uniform size and uniform intervals in all regions, the density of the first patterns 131 is the same in all regions. Accordingly, in the flexible display device 100 according to another example, there is no region where the density of the first pattern 131 is high. In addition, even if the bending area FDA is defined, the boundary line between the bending area FDA and the area other than the bending area FDA is not recognized.

In the flexible display device 100 according to another example, when the first patterns 131 are formed with uniform sizes and uniform intervals in all regions, the difference in thickness due to the difference in density of the first patterns 131 Does not occur. Accordingly, even if the bending area FDA is defined, the thickness of the bending area FDA is the same as the thickness of the bending area FDA.

In the case where the first pattern 131 is uniformly formed in a uniform size and at uniform intervals in all regions, it is preferable that the density of the first pattern 131 be selectively increased in a specific region, It is possible to simplify the etching process to be applied to form the gate electrode 131. Accordingly, the flexible display device 100 according to another example can simplify the manufacturing process.

The gap filling adhesive member 121 according to another example fills the space between the first patterns 131 without any gap. The gap filling adhesive member 121 is formed on the entire upper surface of the substrate 110 while completely surrounding the surface of the first pattern 131. [ In this case, the area where the gap-filling adhesive member 121 is formed between the first pattern 131 and the substrate 110 can be maximized. Accordingly, the flexible display device 100 according to another example can enhance the adhesion between the protection member 110 and the integrated intermediate substrate 180.

7A to 7C are plan views showing the gap filling bonding member 121 and the first pattern 131 of the integrated intermediate substrate 180 according to another example of the present application.

The first pattern 131 according to another example may have a mesh shape. The first patterns 131 may be connected to each other. When the first pattern 131 has a mesh shape, higher rigidity can be secured than when the first patterns 131 are spaced apart from each other in a point shape.

The gap filling bonding members 121 provided on the lower surface of the integrated intermediate substrate 180 according to another example may be spaced apart from each other. The gap filling adhesive member 121 may be an island type and fill the region where the first pattern 131 is not disposed. The gap filling adhesive member 121 may fill the gap of the region where the first pattern 131 is not disposed.

According to another example, the gap-filling adhesive member 121 provided on the lower surface of the integrated intermediate substrate 180 may be spaced apart in an island shape including a polygon or a curved line.

For example, as shown in FIG. 7A, the gap filling bonding member 121 may be arranged in a structure in which a square pattern is repeated, in particular, a diamond structure. The length of the diagonal of one square pattern has a first length D1. The first length D1 may be 0.1 mm or more and 0.3 mm or less.

As another example, as shown in FIG. 7B, the gap filling bonding member 121 may be arranged in a structure in which a hexagonal pattern is repeated, in particular, in a honeycomb structure. The length of the longest diagonal of one hexagonal pattern has a second length D2. The second length D1 may be 0.1 mm or more and 0.3 mm or less.

As another example, as shown in FIG. 7C, the gap filling bonding member 121 is a structure in which an island pattern including a curve is repeated, in particular, a line segment parallel to the first direction Y in a rectangle is converted into a semicircle, X) can be arranged in a structure in which straight lines are repeated. The length of the diameter of the semicircle has a third length D3. The length of the graphic form in the second direction X is the fourth length D4. The third length D3 may be 0.1 mm or more and 0.3 mm or less. The fourth length D4 may be 0.3 mm or more and 1.0 mm or less.

As described above, the size of the first pattern 131 according to another example of the present application is smaller than the size of the first pattern 131 according to the example of the present application. In this case, the flexibility of the integrated intermediate substrate 180 is increased compared with the case where the first pattern 131 is formed largely. Accordingly, the integrated intermediate substrate 180 according to another example can provide the flexible display device 100 with increased flexibility in the entire region and having improved bending characteristics.

The flexible display device 100 according to another example may further include a second pattern 132 disposed between the first patterns 131 and having flexibility in the same manner as the flexible display device 100 according to an example .

The second pattern 132 is disposed in a remaining region of the lower surface of the integrated intermediate substrate 180 where the first pattern 131 is not disposed. The second pattern 132 has high flexibility and ductility. The second pattern 132 may be formed of a flexible material. For example, the second pattern 132 may be formed of silicon (Si) or the like. The second pattern 132 is patterned through a screen printing process. The height of the second pattern 132 is smaller than the height of the first pattern 131. Accordingly, the height of the lower surface of the second pattern 132 may be higher than the height of the lower surface of the first pattern 131. The height of the upper surface of the second pattern 132 may be lower than the height of the upper surface of the first pattern 131.

When the second pattern 132 is additionally disposed, the flexibility of the integrated intermediate substrate 180 is increased due to the second pattern 132. Thus, the flexible display device 100 having more improved bending characteristics can be provided.

The flexible display device 100 according to another example may further include a surface film 133 formed on the upper surface of the first pattern 131. The surface film 133 is integrally disposed on the upper portion of the first pattern 131. The surface film 133 allows the upper surface of the first pattern 131 to be fixed at a fixed position without flowing.

The flexible display device 100 according to another example may further include a flexible substrate 150 disposed on an upper portion of the integrated intermediate substrate 180 in the same manner as the flexible display device 100 according to an exemplary embodiment.

The flexible substrate 150 is disposed on the upper side of the second adhesive member 140. The flexible substrate 150 can be uniformly disposed over the entire area of the upper surface of the second adhesive member 140. [ The flexible substrate 150 may be made of, for example, a highly flexible polymer material such as polyurethane (PU), but is not limited thereto. The flexible substrate 150 may have a thickness of from 28 占 퐉 to 32 占 퐉.

When the flexible substrate 150 is further disposed, the flexible display device 100 having more improved bending characteristics can be provided.

The width and length of the first pattern 131 according to another example are 0.1 mm or more and 0.3 mm or less. In this case, the flexibility of the integrated intermediate substrate 180 is increased compared with the case where the first pattern 131 is formed largely. Accordingly, the integrated intermediate substrate 180 according to another example can provide the flexible display device 100 with increased flexibility in the entire region and having improved bending characteristics.

The direction of the minor axis of the first pattern 131 according to another example is the same direction as the direction in which the stress acts. Since the flexible display device according to another example assumes that folding and bending occur in the first direction Y, the direction in which the stress acts is the first direction Y. [ The first pattern 131 has a short axis in the first direction Y. [ The width of the first pattern 131 in the first direction Y is smaller than the width in the second direction X. [ When the minor axis of the first pattern 131 is in the same direction as the direction of the stress, the width of the first pattern 131 in the direction of the stress becomes smaller. The smaller the width in the direction of the stress, the more the expansion and contraction can be minimized when the flexible display device is bent. Accordingly, the flexible display device according to another example minimizes the expansion and contraction upon bending, thereby preventing cracks or breakage due to bending.

The first pattern 131 according to another example maintains symmetry with respect to the center point of the first pattern 131 in which the major axis and the minor axis of the first pattern 131 intersect with each other while being stretched and contracted in the stress direction. For example, when the first pattern 131 is stressed in the first direction Y, the width of the first pattern 131 in the first direction Y increases, and the center of the first pattern 131 And extends in the vertical direction on the basis of the center point of the first pattern 131 as a point. Also, when the first pattern 131 is elongated in the first direction Y, the center point of the first pattern 131 does not move in the second direction (X). In the stress operation, the first pattern 131 is not formed to have a specific directionality, and has an isotrope that does not change its properties even if the direction of observation is changed. Accordingly, the first pattern 131 according to another example can maintain the balance without being deformed while the shape is distorted in the direction in which the stress acts.

The flexible display device according to the present application increases the adhesion surface between the protective member and the first pattern by using a gap-filling adhesive member. Accordingly, the flexible display device according to another example can enhance the adhesion between the protective member and the integrated intermediate substrate.

Further, in the flexible display device according to the present application, the boundary line of the bending area is not visible, and the thickness of the bending area is the same as the thickness of the bending area, so that the manufacturing process can be simplified.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

100: Flexible display device DA: Display area
NDA: Non-display area FDA: Bending area
10: timing controller 20: data driving circuit
30: Gate drive circuit P: Pixel
110: protective member 120: first adhesive member
130: intermediate substrate 140: second bonding member
150: flexible board 160: third bonding member
170: display panel 131, 132: first and second patterns
133: surface film 121: gap-filling adhesive member
180: Integrated intermediate substrate

Claims (13)

A protective member;
An integrated intermediate substrate disposed on the protection member; And
And a display panel disposed on the integrated intermediate substrate,
Wherein the integrated intermediate substrate comprises:
A plurality of first patterns having protruded rigidity on the bottom surface; And
And a gap filling adhesive member disposed on the protection member and disposed on a lower surface of the first pattern,
Wherein the gap filling adhesive member fills at least some space between the plurality of first patterns. The method according to claim 1,
Wherein the plurality of first patterns are arranged on the lower surface of the intermediate substrate at a uniform size and a uniform interval corresponding to the display area and the non-display area of the display panel. The method according to claim 1,
Wherein the gap filling adhesive member fills all spaces between the plurality of first patterns. The method according to claim 1,
Wherein the first pattern is arranged in a mesh form,
And the gap filling adhesive members are spaced apart from each other to fill the at least some space. 5. The method of claim 4,
Wherein the gap filling adhesive member is an island shape including a polygonal shape or a curved line. The method according to claim 1,
And a plurality of second patterns disposed between the plurality of first patterns and having a greater ductility than the first pattern. The method according to claim 6,
Wherein the second pattern has a height lower than a height of the first pattern. The method according to claim 6,
Wherein the height of the lower surface of the second pattern is higher than the height of the lower surface of the first pattern and the height of the upper surface of the second pattern is lower than the height of the upper surface of the first pattern. The method according to claim 1,
Wherein the integrated intermediate substrate further comprises a surface film formed on an upper surface of the first pattern. The method according to claim 1,
And a flexible substrate disposed on the integrated intermediate substrate. The method according to claim 1,
Wherein the width of the first pattern is 0.1 mm or more and 0.3 mm or less, and the length is 0.1 mm or more and 0.3 mm or less. The method according to claim 1,
Wherein the minor axis of the first pattern is in the same direction as the stress direction. The method according to claim 1,
Wherein the first pattern is stretched and contracted in a stress direction when a stress acts, and the symmetry is maintained based on a center point of a first pattern in which a major axis and a minor axis of the first pattern cross each other.

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