KR20180069763A - Flexible display device and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to a display device and, more particularly, to a flexible display device capable of reducing a bezel width and a manufacturing method thereof. To this end, according to the present invention, the flexible display device comprises: a display panel having a first substrate including a plurality of pixels and formed of a flexible material and a second substrate facing the first substrate; a driving integrated circuit for converting image data and a timing synchronization signal transmitted from a control substrate into a data signal and a gate signal and supplying the same to the display panel; and a cushion member disposed between the bottom surface of the display panel and the driving integrated circuit disposed in the bottom surface direction of the display panel as the bending portion formed in a non-display region of the first substrate is bent.

Description

[0001] FLEXIBLE DISPLAY DEVICE AND METHOD FOR MANUFACTURING THEREOF [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a display device, and more particularly, to a flexible display device and a method of manufacturing the same, which can reduce a bezel width.

In general, a flexible display device has advantages in that a pixel cell is implemented on a thin flexible substrate such as a plastic substrate, so that an image desired to be folded or rolled up like paper can be displayed. And research and development thereof is proceeding. Such a flexible display device may be a flexible liquid crystal display device, a flexible plasma display device, a flexible organic light emitting display device, a flexible electrophoretic display device flexible electrophoretic display device, or a flexible electro-wetting display device.

1 is a cross-sectional view schematically showing a general flexible display device.

Referring to FIG. 1, a typical flexible display device includes a display panel 10 and a panel driver 20.

The display panel 10 includes a lower substrate 12 and an upper substrate 14 which are adhered to each other.

The lower substrate 12 is made of a thin flexible substrate such as plastic. The lower substrate 12 includes a display region including a plurality of pixels for displaying an image, a non-display region surrounding the display region, and a pad portion provided at one side of the non-display region.

For example, in the display region, a gate line and a data line defining a pixel region are formed in an intersecting manner, a thin film transistor is formed in a region where the gate line and the data line cross each other, As shown in Fig. The pad portion is formed on one side non-display region of the lower substrate 12 so as to be connected to the gate line and the data line, respectively, and is connected to the panel driver 20.

The upper substrate 14 is made of a thin and transparent flexible substrate such as plastic or the like and is formed to have a relatively smaller area than the lower substrate 12. The upper substrate 14 is adhered to the lower substrate 12 except for the pad portion of the lower substrate 12 by a joining member (not shown) formed in a non-display region of the lower substrate 12 in the form of a closed loop.

An optical film (not shown) may be attached to the upper surface of the upper substrate 14. In this case, the optical film may have functions of preventing polarization and / or reflection of external light.

The panel driving unit 20 is connected to the pad unit of the lower substrate 12 and supplies signals to gate lines and data lines. The panel driving unit 20 may include a flexible circuit board 21, a driving integrated circuit 23, a control board 25, and a driving circuit unit 27.

The flexible circuit board 21 is attached to the pad portion of the lower substrate 12 and is bent to the lower surface of the lower substrate 12 so as to cover the side surface of the lower substrate 12.

The driving integrated circuit 23 is mounted on the flexible circuit board 21. [ The driving integrated circuit 23 generates a data signal and a gate signal for displaying an image on the display panel 10 based on the video data and the timing synchronization signal provided from the control board 25, Supply.

The control board 25 is attached to the flexible circuit board 21 and disposed on the lower surface of the lower board 12. The control board 25 is connected to a control board (not shown) for generating image data and a timing synchronization signal corresponding to the image to be displayed on the display panel 10, And transmits the synchronous signal to the driving integrated circuit 23 through the flexible circuit board 21. [

The driving circuit unit 27 is mounted on the control board 25 and includes passive elements such as resistors, capacitors and inductors, and / or an integrated circuit (IC), so that the display panel 10 and / And generates a voltage required for driving the driving integrated circuit 23. [

The conventional flexible display device displays a desired image on the display panel 10 by driving each pixel of the display panel 10 according to the driving of the panel driving part 20. [

However, in the conventional flexible display device, the panel driving unit 20, that is, the flexible circuit board 21 is bent so as to enclose the side surface of the lower substrate 12, whereby a part of the flexible circuit board 21 and the bending part 21a A bezel width W is increased due to a part of the flexible circuit board 21 and a bending portion 21a of the flexible printed circuit board 21 because the flexible printed circuit board 21 is disposed on the side surface of the display panel 10 have.

In addition, since the conventional flexible display device uses the flexible circuit board 21 and the control board 25, the production cost increases due to an increase in the number of components, and the flexible circuit board 21 is attached to the lower substrate 12 And the bonding process of attaching the control board 25 to the flexible circuit board 21 may result in a decrease in yield due to bonding defects.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flexible display device and a method of manufacturing the flexible display device which can reduce the bezel width.

According to an aspect of the present invention, there is provided a flexible display device including a display panel including a first substrate formed of a flexible material and including a plurality of pixels, and a second substrate facing the first substrate, ; A driving integrated circuit for converting the video data and the timing synchronization signal transmitted from the control substrate into data signals and gate signals and supplying the data signals to the display panel; And a cushion member disposed between the bottom surface of the display panel and the driving integrated circuit disposed in the bottom surface direction of the display panel as the bending portion formed in the non-display region of the first substrate is bent.

According to another aspect of the present invention, there is provided a method of manufacturing a flexible display, comprising: fabricating a display panel by bonding a first substrate formed of a flexible material including a plurality of pixels to a second substrate; A driving integrated circuit for bending a bending portion formed in a non-display region of the first substrate and converting the video data and the timing synchronization signal transmitted from the control substrate into data signals and gate signals and supplying the data signals and the gate signals to the display panel, Placing the display panel in a bottom surface direction of the display panel; And adhering and fixing the driving integrated circuit to a cushion member disposed on a bottom surface of the display panel.

According to the present invention, since the first substrate constituting the display panel is directly bent and connected to the control board, the bezel width of the display panel can be reduced.

According to the present invention, since the cushion member is disposed between the bottom surface of the display panel and the driving integrated circuit, a phenomenon that the driving integrated circuit collides with the bottom surface of the display panel and is damaged can be prevented.

Further, according to the present invention, the bending portion of the first substrate can be fixed to a certain shape by the adhesive or the curing agent.

1 is a cross-sectional view schematically showing a general flexible display device;
FIG. 2A is a plan view showing a flexible display device according to a first embodiment of the present invention; FIG.
2B and 2C are cross-sectional views taken along the line A1-A2 in FIG. 2A;
FIG. 2D is another cross-sectional view of a flexible display device according to the first embodiment of the present invention. FIG.
FIGS. 3A to 3D are various exemplary views illustrating a cross-section of a flexible display device according to a second embodiment of the present invention. FIG.
4A and 4B are various exemplary views illustrating a cross section of a flexible display device according to a third embodiment of the present invention.
5A to 5D are various exemplary views illustrating a cross section of a flexible display device according to a fourth embodiment of the present invention.
6A to 6D are various exemplary views illustrating a cross section of a flexible display device according to a fifth embodiment of the present invention.
7 is an exemplary view showing a cross section of a flexible display device according to a sixth embodiment of the present invention;

Hereinafter, a flexible display device and a method of manufacturing the same according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2A is a plan view showing a flexible display device according to a first embodiment of the present invention, and FIGS. 2B and 2C are cross-sectional views taken along the line A1-A2 in FIG. 2A. 2B shows a state before the first substrate 110 is bent in the manufacturing process of the flexible display device according to the first embodiment of the present invention, As shown in FIG. FIG. 2D is another cross-sectional view of the flexible display device according to the first embodiment of the present invention, in which the control board MLB is connected to the panel driver.

Referring to FIGS. 2A to 2D, the flexible display device according to the first embodiment of the present invention includes a first substrate 110 including a plurality of pixels and formed of a flexible material, A display panel 100 having a second substrate 120 to be adhered opposite to the first substrate 120, a display panel 100 for converting the image data and the timing synchronization signal transmitted from the control substrate 700 into a data signal and a gate signal, And a bending part 115 formed in a non-display area of the first substrate 110 are bent as the bending part 115 of the display panel 100 is bent, And a cushion member (500) disposed between the driving integrated circuits (210) arranged in the bottom surface direction of the driving integrated circuit (210). here. The driving integrated circuit 210 is included in the panel driving unit.

First, the display panel 100 will be described as follows.

The display panel 100 may be a flexible flat panel display device. In the following description, the present invention will be described on the assumption that the display panel 100 is an organic light emitting display panel of a flexible flat panel display device, which is a flexible organic light emitting display device.

The display panel 100 includes a first substrate 110 and a second substrate 120 which are adhered to each other, a back plate 130 and a light shielding member 140 formed on the lower surface of the first substrate 110, And an optical film (not shown) formed on the upper surface of the substrate 120.

The first substrate 110 is a flexible substrate made of a plastic material or a metal foil. That is, since the first substrate 110 is formed of a flexible material, it can be bent as shown in Figs. 2C and 2D.

For example, the first substrate 110 made of a plastic material may be made of any one material selected from the group consisting of polyimide (PI), polycarbonate (PC), polynorbornene (PNB), polyethyleneterephthalate (PET), polyethylenepthanate (PEN), and polyethersulfone . The first substrate 110 includes a display portion, a non-display portion, a bending portion 115, and a pad portion 116.

The display portion of the first substrate 110 includes a plurality of gate lines (not shown), a plurality of data lines (not shown), a plurality of driving power lines (not shown), a plurality of pixels (not shown) Not shown).

Each of the plurality of gate lines is formed at regular intervals so as to intersect with each of the plurality of data lines, and each of the plurality of driving power supply lines is formed to be parallel to each of the plurality of gate lines or the plurality of data lines.

Each of the plurality of pixels is formed in a pixel region defined by intersecting gate lines and data lines to display an image in accordance with a gate signal from the gate line and a data signal from the data line. To this end, each of the plurality of pixels includes a pixel driving circuit (not shown) connected to the gate line and the data line, and an organic light emitting element (not shown) connected to the pixel driving circuit and connected to the cathode power line.

The pixel driving circuit includes a switching transistor (not shown) connected to the gate line and the data line, a driving transistor (not shown) connected to the switching transistor, a capacitor (not shown) connected to the gate electrode and the source electrode of the driving transistor .

The pixel driving circuit supplies the data signal supplied to the data line to the driving transistor according to the switching of the switching transistor according to the gate signal supplied to the gate line, and stores the gate-source voltage of the driving transistor corresponding to the data signal in the capacitor do.

And supplies the data current corresponding to the data signal to the organic light emitting element by turning on the driving transistor with the voltage stored in the capacitor. Here, the transistor may be an a-Si TFT (thin film transistor), a poly-Si TFT, an oxide TFT, an organic TFT, or the like.

On the other hand, the pixel driving circuit may further comprise at least one compensation transistor and at least one compensation capacitor for compensating the threshold voltage of the driving transistor.

The organic light emitting device includes a pixel electrode (or an anode electrode) connected to the driving transistor, an organic light emitting layer (not shown) formed on the pixel electrode, and a cathode electrode (not shown) formed on the organic light emitting layer. The organic light emitting diode emits light of a luminance corresponding to the data current to the upper side of the second substrate 120 by emitting current by the current flowing from the pixel electrode to the cathode electrode by the turn-on of the driving transistor.

The cathode power supply line may be formed in a pattern such that the cathode power supply line is electrically connected to the cathode electrode of each pixel or may be formed on the entire surface of the display unit or may be electrically connected to the cathode electrode of pixels formed on the vertical or horizontal line of the display unit. Such a cathode power supply line may be formed so as to be electrically connected to the organic light emitting layer of each pixel, in which case the cathode electrode is omitted.

The non-display portion is provided in the peripheral region of the display portion so as to surround the display portion. Here, the non-display portion may be defined as an area overlapping an edge portion of the second substrate 120.

On one side of the non-display portion, a plurality of link lines (not shown) electrically connected to each of a plurality of gate lines, a plurality of data lines, a plurality of driving power supply lines, and a cathode power supply line are formed.

The bending portion 115 extends from one side of the non-display portion to have a predetermined area and is bent in the bottom surface direction of the first substrate 110. That is, the bending part 115 is bent by a substrate bending device (not shown) so as to have a predetermined curvature, and is superimposed on one side lower part of the second substrate 120. The bending portion 115 is formed with a plurality of extension lines (not shown) electrically connected to each of the plurality of link lines.

The pad portion 116 of the first substrate 110 is electrically connected to the first flexible circuit board 200 of the panel driving portion.

2C, the bending portion 115 is bent so as to be spaced apart from the lower surface of the light shielding member 140 by a predetermined step. However, the bending portion 115 is not limited to the bending portion 115, It may be folded. In this case, the thickness of the display panel 100 can be minimized.

The second substrate 120 of the display panel 100 is formed of a transparent plastic material and has a relatively smaller area than the first substrate 110. The second substrate 120 is adhered to the inner portion of the bending portion 115 of the first substrate 110 by a cohesive member (not shown) formed in a closed loop shape on the non-display portion of the first substrate 110, do.

The first and second substrates 110 and 120 are bonded to each other and the first substrate 110 and the second substrate 120 are bonded to each other to protect the organic light emitting device from external moisture or oxygen. Thereby sealing the space between them.

The back plate 130 is formed on the lower surface of the first substrate 110 and the light shielding member 140 is formed on the lower surface of the back plate 130. The light shielding member 140 blocks the light emitted from the display unit 112 of the first substrate 110 from traveling downward of the first substrate 110.

The light shielding member 140 may be formed of a black tape or a coating layer made of a light shielding material. The light shielding member 140 includes a first flexible circuit board 200 and a second flexible circuit board 300 on which the bottom surface of the first substrate 110 and the panel driver are formed except for the bending portion 115 of the first substrate 110, As shown in FIG.

The optical film is formed to have a function of polarization and / or reflection prevention to prevent reflection of external light, and is attached to the upper surface of the second substrate 120. Such an optical film may be omitted.

Next, the panel driving unit will be described as follows.

The panel driving unit may include a first flexible circuit board 200, a second flexible circuit board 300, and a driving integrated circuit.

The first flexible printed circuit board 200 may be a chip on film (COF). The first flexible printed circuit board 200 may include driving integrated circuits (not shown) for supplying data signals and gate signals for emitting pixels of the display panel 100, Circuit 210 is mounted.

The second flexible printed circuit board 300 may be an FPC (Flexible Printed Circuit), and driving elements for supplying image data and a timing synchronization signal input from the control board 700 to the driving integrated circuit 210 may be surface- And a protection cap 310 for protecting the driving elements is formed.

The protective cap 310 not only functions to protect the driving elements by covering the driving elements mounted on the second flexible printed circuit board 300 but also protects the display panel 100 and prevents the electrical connection between the driving elements .

One side of the first flexible circuit board 200 is electrically connected to the pad portion 116 of the first substrate 110 and the other side is electrically connected to the second flexible circuit board 200 through the pad portion 220 of the first flexible circuit board 200. [ And is electrically connected to the flexible circuit board 300.

The driving integrated circuit 210 is mounted on the first flexible printed circuit board 200 by a chip bonding process or a surface mounting process and is bonded to a plurality of signal supply terminals and a plurality of signal input terminals.

The driving integrated circuit 210 generates a data signal and a gate signal based on image data and a timing synchronization signal supplied from outside via a plurality of signal input terminals and supplies the generated data signal and gate signal to corresponding signal supply terminals And drives each pixel formed on the display portion of the first substrate 110 to display an image corresponding to the image data on the display portion.

2B, the driving integrated circuit 210 may be formed on a lower surface of the first flexible circuit board 200. [ In this case, as shown in FIG. 2C, when the bending portion 115 of the first substrate 110 is bent, the driving integrated circuit 210 is positioned between the bottom surface of the display panel and the first substrate 110.

On the other hand, as shown in FIG. 2B, the driving elements may be formed on the upper surface of the second FPCB 300. 2C, when the bending portion 115 of the first substrate 110 is bent, the lower surface of the second flexible circuit board 300 is bonded to the back plate 130 or the light shielding member 140, that is, attached to the bottom surface of the display panel, and the upper surface of the second flexible printed circuit board 300 is directed downward.

As described above, driving elements may be formed on one surface of the second flexible printed circuit board 300, and the other surface may be attached to the back plate 130 or the light shielding member 140 through an adhesive member.

The elastic restoring force of the bending part 115 is restrained and the shape of the bent bending part 115 can be maintained as it is attached to the bottom surface of the back plate 130. [

Finally, the cushion member 500 will be described as follows.

As described above, when the bending portion 115 of the first substrate 110 is bent, the driving integrated circuit 210 is positioned between the bottom surface of the display panel and the first substrate 110. In this case, a cushion member 500 is disposed between the display panel and the driving integrated circuit 210 to prevent the driving integrated circuit 210 from directly contacting the bottom surface of the display panel. Here, the bottom surface of the display panel may be the bottom surface of the first substrate 110, the bottom surface of the back plate 130, or the bottom surface of the light shielding member 140.

That is, the cushion member 500 functions to prevent the driving integrated circuit 210 from directly contacting the bottom surface of the display panel 100. In this case, the display panel 100 or the driving integrated circuit 210 can be prevented from being damaged by the cushion member 500.

The cushion member 500 may be formed of various materials having a cushion. For example, the cushion member 500 may be formed of latex, a sponge, a urethane foam as a foamable resin, EVA, silicon, or the like. Further, the cushion member 500 may be formed in the form of a tape having a cushion.

The cushion member 500 includes a first surface that is in contact with the display panel 100 and a second surface that is opposite to the first surface.

The cushion member 500 may be attached to the bottom surface of the display panel 100 by a double-sided tape or an adhesive attached to the first surface of the cushion member 500. Further, the cushion member 500 may be directly attached to the light shielding member 140 to which the adhesive material is applied.

Since the second surface of the cushion member 500 is pushed toward the first surface when the driving circuit 210 is brought into close contact with the driving integrated circuit 210 because the cushion member 500 has elasticity, Can be inserted and fixed to the inside of the housing 500.

However, in order to more securely fix the driving integrated circuit 210, a groove 510 into which the driving integrated circuit 210 can be inserted may be formed on the second surface of the cushion member 500. [

A separate adhesive may be attached to the entirety of the second surface of the cushion member 500 or the groove 510 formed on the second surface to fix the driving integrated circuit 210. Further, the adhesive component is applied to the second surface of the cushion member 500 itself, so that the driving integrated circuit 210 may be fixed.

The cushion member 500 and the driving integrated circuit 210 may be closely contacted by various methods. For example, in a state where the cushion member 500 is attached to the bottom surface of the display panel 100, as the bending portion 115 is bent, the driving integrated circuit 210 can be brought into close contact with the cushion member 500 have. Before the bending portion 115 is bent, the bending portion 115 is bent while the cushion member 500 is in close contact with the upper end of the driving integrated circuit 210, and the first surface of the cushion member 500 Or the first surface of the cushion member 500 may be attached to the bottom surface of the display panel 100 by an adhesive or the like attached to the bottom surface of the display panel 100. [

A method of manufacturing the flexible display device according to the first embodiment of the present invention will now be described.

First, the first substrate 110 and the second substrate 120 of the display panel 100 are adhered to each other and the back plate 130 is formed on the lower surface of the first substrate 110.

Second, the first flexible printed circuit board 200 on which the driving integrated circuit 210 is formed is connected to the pad portion 116 of the first substrate 110. Further, the second flexible circuit board 300 on which the driving elements are formed is connected to the second flexible circuit board 200.

Third, the bending portion 115 of the first substrate 110 is bent to bend the first and second flexible circuit boards 200 and 300 toward the bottom surface of the display panel 100.

Fourth, the driving integrated circuit 210 is brought into close contact with the cushion member 500 attached to the bottom surface of the display panel 100. In this case, the first surface of the cushion member 500 which is in close contact with the driving integrated circuit 210 may be attached to the bottom surface of the display panel 100, as described above.

Fifth, the lower surface of the second flexible printed circuit board 300 is attached to the bottom surface of the display panel 100 using the light shielding member 140 or another attaching material. As the second flexible printed circuit board 300 is attached to the bottom surface of the display panel 100, the shape of the bent bending portion 115 can be maintained as it is.

On the other hand, the outer surface of the bending portion 115, that is, the outer surface exposed to the outside of the bending portion 115, may be coated with a pressure-sensitive adhesive formed of resin. The shape of the bent bending portion 115 can be more stably maintained because the adhesive is hardened while being attached to the outer surface of the bending portion 115. [ The pressure-sensitive adhesive may be formed of a thermosetting resin, an ultraviolet-setting resin, or the like.

Sixth, the control board 700 is connected to the second flexible printed circuit board 300 using the panel driving unit connector 320, as shown in FIG. 2D. A control board connector 710 connected to the panel drive connector 320 is mounted on the control board 700.

The control board 700 carries out a function of transmitting video data, a timing synchronization signal, and the like to the driving integrated circuit 210. That is, the control board 700 functions as a main board of an electronic product to which the flexible display device according to the first embodiment of the present invention is mounted, and generates a video data, a timing synchronization signal, and the like related to the video output. To this end, various types of integrated circuits (ICs) and passive elements (resistors, capacitors, etc.) not shown in the figure are arranged on the control board 700. The driving integrated circuit 210 generates a data signal and a gate signal to be supplied to the display panel 100 using the video data and the timing synchronization signal transmitted from the control board 700.

In the flexible display device according to the first embodiment of the present invention as described above, the bezel width W can be reduced by bending the bending portion 115 extending from one side of the first substrate 110.

In the flexible display device according to the embodiment of the present invention, the positions where the driving integrated circuit 210, the driving elements, and the protective cap 310 of the panel driving unit are formed are determined by the bending structure of the display panel 100, And can be variously changed depending on the structure. This will be briefly described below for each embodiment.

3A to 3D are various exemplary views showing a cross section of a flexible display device according to a second embodiment of the present invention. Hereinafter, the same or similar contents as those described in the flexible display device according to the first embodiment of the present invention are omitted or briefly described.

3A shows a state before the first substrate 110 is bent in the manufacturing process of the flexible display device according to the second embodiment of the present invention. FIG. 3B shows a state before the first substrate 110 is bent, As shown in FIG. Referring to FIGS. 3A and 3B, the flexible display device according to the second embodiment of the present invention is characterized in that the panel driver is composed of only the first flexible circuit board 200.

A COF (Chip On Film) may be applied to the first flexible circuit board 200.

In addition to the driving integrated circuit 210, driving elements for supplying the driving integrated circuit 210 with video data and a timing synchronization signal input from the control board 700 are mounted on the first flexible printed circuit board 200 by a surface mounting method And a protective cap 310 for protecting the driving elements is formed.

That is, in the first embodiment of the present invention, only the driving integrated circuit 210 is mounted on the first flexible printed circuit board 200 and the driving elements protected by the protection cap 310 are mounted on the second flexible printed circuit board 300 However, in the second embodiment of the present invention, the driving elements protected by the driving integrated circuit 210 and the protection cap 310 are mounted on the first flexible circuit board 200. In this case, the power IC for supplying the power required for driving the driving integrated circuit 210 and the display panel 100 can be mounted on the control board 700. [

The cushion member 500 applied to the second embodiment of the present invention as described above has a function of protecting only the driving integrated circuit 210 like the cushion member 500 applied to the first embodiment of the present invention .

3B, both the driving integrated circuit 210 and the protection cap 310 are all adjacent to the bottom surface of the display panel 100, but the protection cap 310 has a function of protecting the driving elements The cushion member 500 for the protective cap 310 may not be provided.

In this case, the protective cap 310 may be attached to the bottom surface of the display panel 100 through a separate adhesive.

Next, referring to FIG. 3C, the control board 700 may be connected to the first flexible circuit board 200 as shown in FIG. 3B. As described in the first embodiment of the present invention, the control board 700 and the first flexible circuit board 200 may be electrically connected through the panel drive connector and the control board connector, and various other types of bending methods .

The control board 700 may also be attached to the bottom surface of the display panel 100 through various types and types of adhesives.

Referring to FIG. 3D, the first flexible circuit board 200 may be connected to the control board 700 through a slit-shaped hole 720 formed in the control board 700. That is, the width of the control board 700 is wider than the width of the panel driving portion (the first flexible circuit board 200), and the control board connector 710 for connecting the first flexible circuit board 200 and the control board 700 Is disposed on a surface opposite to the surface facing the first flexible circuit board 200 among the both surfaces of the control board 700, the first flexible circuit board 200 includes a slit-shaped hole 720 And can be connected to the control board connector 710.

4A and 4B are various illustrations showing a cross-section of a flexible display device according to a third embodiment of the present invention. Hereinafter, the same or similar contents as those described in the flexible display device according to the first embodiment or the second embodiment of the present invention are omitted or briefly described.

4A illustrates a state in which the first substrate 110 is bent at the back surface of the display panel 100 during the manufacturing process of the flexible display device according to the third embodiment of the present invention. Referring to FIG. 4A, the third embodiment of the present invention is characterized in that the panel driving unit is composed of only the first flexible circuit board 200, as in the second embodiment of the present invention.

A COF (Chip On Film) may be applied to the first flexible circuit board 200.

In addition to the driving integrated circuit 210, driving elements for supplying the driving integrated circuit 210 with video data and a timing synchronization signal input from the control board 700 are mounted on the first flexible printed circuit board 200 by a surface mounting method And a protective cap 310 for protecting the driving elements is formed.

That is, in the first embodiment of the present invention, only the driving integrated circuit 210 is mounted on the first flexible printed circuit board 200 and the driving elements protected by the protection cap 310 are mounted on the second flexible printed circuit board 300 However, in the third embodiment of the present invention, the driving elements protected by the driving integrated circuit 210 and the protection cap 310 are mounted on the first flexible circuit board 200. In this case, the power IC for supplying the power required for driving the driving integrated circuit 210 and the display panel 100 can be mounted on the control board 700. [

The cushion member 500 applied to the third embodiment of the present invention as described above is different from the cushion member 500 applied to the first and second embodiments of the present invention in that the driving integrated circuit 210, And the protection cap 310, as shown in FIG.

That is, in the third embodiment of the present invention, as shown in FIG. 4A, both the drive integrated circuit 210 and the protective cap 310 are all adjacent to the bottom surface of the display panel 100, and the protective cap 310 And the driving integrated circuit 210 are both kept in close contact with the cushion member 500.

In this case, two grooves may be formed in the cushion member 500 so that the protective cap 310 and the driving integrated circuit 210 can be inserted.

Next, referring to FIG. 4B, the control board 700 may be connected to the first flexible circuit board 200 as shown in FIG. 4A. In this case, various elements mounted on the control board 700 can be arranged facing the first flexible circuit board 200, and the first flexible circuit board 200 is bent in the direction of the control board 700 And may be connected to the control board 700 through a connector or the like.

That is, the display panel 100, the protective cap 310 and the driving integrated circuit 210, the first flexible circuit board 200, the elements of the control board, and the control board 700 are sequentially stacked, The flexible display device according to the third embodiment can be manufactured.

5A to 5D are various exemplary views showing a cross section of a flexible display device according to a fourth embodiment of the present invention. Hereinafter, the same or similar contents as those described in the flexible display device according to the first to third embodiments of the present invention are omitted or briefly described.

5A shows a state before the first substrate 110 is bent in the manufacturing process of the flexible display device according to the fourth embodiment of the present invention. FIG. 5B shows a state before the first substrate 110 is bent, As shown in FIG. Referring to FIGS. 5A and 5B, the flexible display device according to the fourth embodiment of the present invention is characterized in that the panel driver is composed of only the first flexible circuit board 200.

A COF (Chip On Film) may be applied to the first flexible circuit board 200.

Only the driving integrated circuit 210 is mounted on the first flexible printed circuit board 200. That is, in the second embodiment and the third embodiment of the present invention, the driving integrated circuit 210 and the driving elements protected by the protection cap 310 are mounted on the first flexible circuit board 200, Only the driving integrated circuit 210 is mounted on the first flexible printed circuit board 200. In this case,

In this case, the driving elements for performing the function of supplying the driving integrated circuit 210 with the video data and the timing synchronization signal input from the control board 700 may be mounted on the control board 700. [

Therefore, the cushion member 500 applied to the fourth embodiment of the present invention as described above is similar to the cushion member 500 applied to the first and second embodiments of the present invention, 210) is protected.

5B, the driving integrated circuit 210 is disposed on the bottom surface of the display panel 100, and a cushion member 500 is disposed between the bottom surface of the display panel 100 and the driving integrated circuit 210, Respectively.

A groove for inserting the driving integrated circuit 210 may be formed on the second surface of the cushion member 500 and a groove 510 formed on the second surface or the second surface of the cushion member 500 may be formed, An adhesive may be adhered or formed. The driving integrated circuit 210 can be fixedly attached to the cushion member 500 by an adhesive.

5C, the first flexible circuit board 200 may be connected to the control board 700 through a slit-shaped hole 720 formed in the control board 700. [ That is, the width of the control board 700 is wider than the width of the panel driving portion (the first flexible circuit board 200), and the control board connector 710 for connecting the first flexible circuit board 200 and the control board 700 Is disposed on a surface opposite to the surface facing the first flexible circuit board 200 among the both surfaces of the control board 700, the first flexible circuit board 200 includes a slit-shaped hole 720 And can be connected to the control board connector 710.

5D, on both sides of the control board 700, on the first surface facing the display panel 100, one of both surfaces of the first flexible circuit board 200 is connected to the driving integrated circuit 210 The first flexible printed circuit board 200 and the control board 700 can be electrically connected to each other.

In this case, the protective cap covering the driving elements mounted on the first surface of the control board is attached to the bottom surface of the display panel 100, so that the control board 700 can be fixed to the display panel 100.

6A to 6D are various exemplary views illustrating a cross section of a flexible display device according to a fifth embodiment of the present invention. Hereinafter, the same or similar contents as those described in the flexible display device according to the first to fourth embodiments of the present invention will be omitted or briefly described.

6A shows a state before the first substrate 110 is bent in the manufacturing process of the flexible display device according to the fifth embodiment of the present invention. FIG. 6B shows a state before the first substrate 110 is bent, As shown in FIG. Referring to FIGS. 6A and 6B, the flexible display device according to the fifth embodiment of the present invention is characterized in that the driving integrated circuit 210 is mounted on the first substrate 110.

The second flexible printed circuit board 300 may be an FPC (Flexible Printed Circuit).

Driving elements for supplying image data and a timing synchronization signal input from the control board 700 to the driving integrated circuit 210 are formed on the second flexible circuit board 300 by a surface mount method, A protective cap 310 for protection is formed.

In this case, the driving integrated circuit 210 for transferring the data signal and the gate signal to the display panel 100 using the video data, the timing synchronization signal, and the like is mounted on the first substrate 110. The drive integrated circuit 210 may be covered and protected by a protective cover 250.

That is, in the fifth embodiment of the present invention, the driving elements protected by the protection cap 310 are mounted on the second flexible circuit board 300, and the driving integrated circuit 210 is protected by the protection cover 250 And is mounted on the first substrate 110 in a protected state.

The cushion member 500 applied to the fifth embodiment of the present invention as described above is different from the cushion member 500 applied to the embodiments described above in that the driving integrated circuit 210 or the protective cap 310, And does not perform the function of supporting or protecting.

6B, the driving integrated circuit 210 is mounted on the upper surface of the display panel 100, and the protective cap 310 is also mounted on both surfaces of the second flexible circuit board 300, The driving integrated circuit 210 and the protection cap 310 are not directly brought into contact with the bottom surface of the display panel 100 because they are mounted on the first surface corresponding to the upper surface of the display panel 100.

However, in the fifth embodiment of the present invention, in order to minimize friction or impact between the driving integrated circuit 210 and the display panel 100, as shown in FIG. 6B, in the bottom surface of the display panel 100, The cushion member 500 may be disposed at a portion where the circuit 210 is closely contacted.

In this case, the second surface of the second flexible printed circuit board on which the protection cap 310 is not formed can be attached and fixed to the bottom surface of the display panel 100 by the adhesive member.

Next, referring to FIG. 6C, the control board 700 may be connected to the second flexible printed circuit board 300 as shown in FIG. 6B. As described in the first embodiment of the present invention, the control board 700 and the second flexible printed circuit board 300 may be electrically connected through the panel drive connector and the control board connector, and various other types of bending methods .

In this case, the first surface of the control board 700 on which the driving elements are not formed may be attached to the bottom surface of the display panel 100 through the adhesive agent of various kinds and shapes, The first surface on which the middle driving elements are mounted can be attached to the first surface of the control board 700. [

6B, the second flexible printed circuit board 300 as shown in FIG. 6B is connected to the control board 700 through a slit-shaped hole 720 formed in the control board 700 . That is, the width of the control board 700 is wider than the width of the panel driving portion (the second flexible printed circuit board 300), and the control board connector 710 for connecting the second flexible printed circuit board 300 and the control board 700 Is disposed on a surface of the control board 700 opposite to the surface facing the second flexible printed circuit board 300, the second flexible printed circuit board 300 has a slit-shaped hole 720 And can be connected to the control board connector 710.

7 is a cross-sectional view of a flexible display device according to a sixth embodiment of the present invention. Hereinafter, the same or similar contents as those described in the flexible display device according to the first to fifth embodiments of the present invention are omitted or briefly described.

In the flexible display device according to the sixth embodiment of the present invention, a curing agent formed of Resin may be applied to the inner surface of the bending portion 115 that is not exposed to the outside among both surfaces. The shape of the bent bending portion 115 can be more stably maintained since the hardening agent 800 is hardened while being attached to the inner surface of the bending portion 115. [

The curing agent 800 may be formed by various methods.

For example, after the hardener 800 is applied to the inner surface of the bending portion 115 before the bending portion 115 is bent, the bending portion 115 is bent. Thereafter, the curing agent 800 can be cured using heat or ultraviolet rays.

After the bending part 115 is bent, the hardening agent 800 may be cured by using heat or ultraviolet rays after the hardening agent is injected through open sides opened to both the right and left sides.

The curing agent may be formed of a thermosetting resin, an ultraviolet curing resin, or the like.

7 shows that the curing agent 800 is formed on the flexible display device according to the third embodiment of the present invention shown in Fig. 4A. However, the curing agent 800 may be applied to all of the above- The same applies to the example.

That is, in the present invention, the cushion member 500 may be disposed between the driving integrated circuit 210 and the bottom surface of the display panel 100, and the adhesive 600 may be formed on the outer surface of the bending portion 115 And a curing agent 800 may be formed on the inner surface of the bending portion 115.

In other words, at least one of the above-described three components, that is, the cushion member 500, the pressure-sensitive adhesive 600, and the curing agent 800 is formed in the present invention.

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 or scope of the general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of.

100: panel 200: first flexible circuit board
210: driving integrated circuit 300: second flexible circuit board
310: protective cap 500: cushion member
600: pressure-sensitive adhesive 800: hardened material
700: Control board

Claims (9)

A first region including a plurality of pixels, a second region facing the first region in a direction opposite to a direction in which light is emitted for image display, and a bending region between the first region and the second region A flexible substrate;
A driving integrated circuit located in the second region of the flexible substrate and supplying a data signal to the plurality of pixels;
At least a part of which is located between the first region and the second region of the flexible substrate;
A flexible circuit board having one end attached to the second region of the flexible substrate; And
And a cushion member positioned between the light shielding member and the second region of the flexible substrate. The method according to claim 1,
Wherein the cushion member comprises an adhesive tape type. 3. The method of claim 2,
And a back plate positioned between the first region of the flexible substrate and the light shielding member. The method of claim 3,
And a protective cover for protecting the driving integrated circuit. 5. The method of claim 4,
And a control board located below the flexible circuit board and having a connector to which the other end of the flexible circuit board is connected. 6. The method of claim 5,
Wherein the control board includes the driving induction circuit and a power supply unit for supplying power to the plurality of pixels. 6. The method of claim 5,
And a pressure sensitive adhesive covering the outer surface of the bending region. The method according to claim 1,
Wherein an adhesive is attached to the first surface of the cushion member and the second surface facing the first surface. The method according to claim 1,
Wherein the driving integrated circuit is located in a direction opposite to a direction in which the cushion member is located in the second region of the flexible substrate.

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