KR20090036427A - Display device precursor and display device - Google Patents

Abstract

An image display device precursor and an image display device are provided to remove a problem during a process of manufacturing a flexible substrate by using a carrier substrate. An image display panel(2) is formed in a predetermined region of a flexible substrate. A carrier substrate(3) is combined with a lower part of the flexible substrate by a combining member(4). The combining member is positioned in the outside of the image display panel. A separate unit(5) is formed in the flexible substrate. The separate unit is between the image display panel and the combining member to separate the carrier substrate and the image display device. The flexible substrate is a metal foil. The separate unit is formed by cutting the flexible substrate by a point line or partially cutting the flexible substrate.

Description

Image display device precursor and image display device {Display Device Precursor And Display Device}

The present invention relates to an image display device precursor and an image display device.

Image displays, in particular organic light emitting diodes (OLEDs), can form devices on flexible transparent substrates such as plastics, as well as plasma display panels or inorganic electroluminescent devices. Compared to the (EL) display, it can be driven at a voltage lower than 10V, has a relatively low power consumption, and has excellent color. In addition, the organic electroluminescent device can display three colors of green, blue, and red, and thus, has become a subject of much interest as a next generation rich color display device.

Here, the process of manufacturing the organic EL device is briefly described as follows.

(1) First, an anode material is coated on the transparent substrate. Indium tin oxide (ITO) is commonly used as the anode material.

(2) Apply a hole injecting layer (HIL) on it. As the hole injection layer, copper phthalocyanine (CuPc) is mainly coated with a thickness of 10 nm to 30 nm.

(3) Then introduce the hole transport layer (HTL). Such a hole transport layer is 4,4'-bis [N- (1-naphthyl) -N-pentylamino] biphenyl (4,4'-bis [N- (1-naphthyl) -N-phenthylamino]- biphenyl, NPB) is coated by depositing about 30nm to 60nm.

(4) An organic emitting layer is formed thereon. At this time, a dopant is added as necessary. In the organic light emitting layer, the red light emitting layer, the green light emitting layer, and the blue light emitting layer form one pixel to express various gray scales.

(5) An electron transport layer (ETL) and an electron injecting layer (EI L) are continuously coated thereon or an electron injection transport layer is formed thereon.

(6) Next, a cathode is coated, and finally a protective film is laminated.

In the case of using a flexible substrate as a substrate of the organic EL device, handling of the flexible substrate is not easy in the manufacturing process. In particular, due to the flexibility, even if a slight pressure is applied, uneven deposition occurs in the deposition process of the organic material, and difficult to be produced, such as difficult to produce a crack due to the bending of the organic layer is difficult to deposit. This phenomenon is particularly problematic in mass production processes in which a plurality of organic light emitting diodes are simultaneously manufactured on a large area flexible substrate.

In order to solve the problem in the manufacturing process of the flexible substrate, a rigid substrate is used as the carrier substrate, and the flexible substrate is adhered to the carrier substrate with an adhesive and the image display unit is formed. Consider a method of manufacturing an image display device by removing the carrier substrate.

However, in such a method, there is a high risk of damage such as cracks in the image display device due to excessive pressure applied in the process of separating the carrier substrate from the image display device, and the problem remains because the adhesive remains in the image display device. Difficult to apply easily due to difficulties such as having to go through the cleaning process.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and solves problems in the manufacturing process of a flexible substrate using a carrier substrate, and separates the carrier substrate in a stable and simple manner, and at the same time there is no problem of remaining of adhesive, etc. An object of the present invention is to provide a precursor of and an image display device manufactured using the same.

As a means for achieving the above object,

The present invention is a flexible substrate; An image display unit formed in a predetermined area on the flexible substrate; A carrier substrate bound to a lower portion of the flexible substrate by a binding member positioned outside the image display unit; And a separation unit formed on the flexible substrate and positioned between the image display unit and the binding member to separate the carrier substrate and the image display element.

In addition, the flexible substrate is provided with an image display device precursor, characterized in that the metal foil.

In addition, the separation unit provides an image display device precursor, characterized in that formed by cutting the flexible substrate by a dotted line or incomplete cutting.

In addition, the image display device precursor is characterized in that it further comprises a separation auxiliary groove formed in the carrier substrate corresponding to all or part of the separation unit.

In addition, the binding member provides an image display device precursor, characterized in that the adhesive or adhesive.

In addition, the flexible substrate provides an image display device precursor, characterized in that having a thickness of 0.05 ~ 0.1T.

In addition, the image display unit provides an image display device precursor, characterized in that the organic electroluminescent system.

The present invention also provides an image display device manufactured by separating the separating portion of the image display device precursor.

According to the present invention, which provides the above means, an image display device precursor is prepared using a carrier substrate which can improve a problem that is difficult to deal with in the process of a flexible substrate, and then the carrier substrate is separated by a stable and simple method. It is possible to manufacture an image display element having no back.

Hereinafter, the present invention will be described in more detail with reference to the drawings showing specific examples of the present invention. The following examples are specific examples of the present invention, but the present invention is not limited thereto even though there is a certain or definite expression.

1 and 2 are schematic cross-sectional views and a plan view of an image display device precursor according to an embodiment of the present invention. As shown, a flexible substrate, an image display unit formed in a predetermined region above the flexible substrate, a carrier substrate bound to the lower portion of the flexible substrate by a binding member located outside the image display unit, and formed on the flexible substrate, And a separation unit disposed between the image display unit and the binding member to separate the carrier substrate and the image display element.

The flexible substrate is a substrate of an image display device such as an organic EL device, and any flexible material can be used. Flexible plastic sheets can also be used. Preferably metal foils can be used. The thickness of the flexible substrate is not limited, but preferably has a thickness of 0.05 ~ 0.1T. Above range

 The flexible substrate is difficult to handle in the manufacturing process and there is a high risk that the image display portion formed on the flexible substrate is damaged due to small carelessness and pressure. In addition, if the bending occurs during the process due to flexibility, there is also a problem that the image display portion is formed unevenly. The present invention can solve this problem by fixing the flexible substrate to the carrier substrate to proceed with the process.

An image display unit is formed in an upper predetermined region of the flexible substrate.

The image display unit is formed according to the type of the image display element. For example, in the case of a flexible display, electrophoretic particles are placed in a plurality of pixels, and electrophoretic particles are electrophoresed through an electric field of two or more electrodes to display an image. It can be formed to be.

In the case of the organic electroluminescent element, the organic electroluminescent system is configured in the image display unit.

The organic electroluminescent system may be configured in various ways and is not limited as long as it emits light through the organic light emitting layer. Specific examples of the structure include (1) anode / light emitting layer / cathode, (2) anode / hole transporting layer / light emitting layer / cathode, (3) anode / hole transporting layer / electron transporting layer / cathode, (4) anode / hole injection Layer / hole transport layer / light emitting layer / cathode, (5) anode / hole injection layer / hole transport layer / light emitting layer / electron transport layer / cathode, (6) anode / hole injection layer / hole transport layer / light emitting layer / electron transport layer / electron injection layer / cathode And (7) anode / hole injection layer / light emitting layer / electron injection layer / cathode.

3 is a cross-sectional view of an organic light emitting diode as an image display device according to an exemplary embodiment of the present invention. Briefly described as follows. First, the anode 21 is formed on the flexible substrate 1 by sputtering or the like, and the hole injection layer 22 and the hole transport layer 23 are sequentially vacuum deposited on the anode. After forming the organic light emitting layer 24 and the electron transport layer 25 on the hole transport layer 23 again by vacuum deposition, an electron injection layer 26 and a cathode 27 are formed on the electron transport layer 25. Alternatively, it may be formed in the reverse order to the above method to form a reverse grain structure. Thereafter, the cap 6 of FIG. 1 is covered to protect the image display unit.

The light emitting layer 24 may be formed of a light emitting material alone or in combination, and a dopant may be used as necessary. The light emitting layer may be manufactured in a multi-layered structure in which red and green light emitting layers are further provided for white light emission.

ITO or IZO can be used as a material of the anode 21, and copper (II) phthalocyanine is usually used as a material of the hole injection layer 22. The hole transport layer 23 may be triphenylamine or diphenylamine derivatives such as NPD (N, N-di (naphthalen-1-yl) -N, N'-diphenylbenzidine), and Alq3 has excellent electron transport characteristics. Therefore, it can be used as the electron transport layer 25, another material that can be used as the electron transport layer 25 is 2- (4-non-phenyl) -5- (4-tert-butylphenyl) -1,3, Oxadiazole and triazole derivatives such as 4-oxadiazole. Alkali metal (Cs, Rb, K, Na, Li) derivatives (Li ₂ O, etc.) may be used as the material of the electron injection layer 26, and Mg / Ag, Al, Al may be used as the material of the cathode 27. / Li and Al / Nd are possible.

Each layer constituting the organic electroluminescent element can be formed by thinning by applying a known method, such as a vapor deposition method, a spin coat method, a cast method, or the like, to a material which should constitute each layer. The film thickness of each of the layers thus formed, for example, the light emitting layer, is not particularly limited and can be appropriately selected depending on the situation.

Under the flexible substrate on which the image display unit is formed, the carrier substrate is bound by a binding member located outside the image display unit. Of course, it is preferable to form an image display section after first binding the carrier substrate to the flexible substrate.

It is preferable to use a rigid substrate as the carrier substrate, and organic materials such as plastics, inorganic materials such as glass, and materials such as metals are not limited.

As shown in FIG. 1, the binding member may be formed outside the region where the image display unit is located so that the binding member may also be separated from the image display element when the carrier substrate and the image display element are separated. Through this, it is possible to solve the problem of contamination and damage of the image display device due to the binding member. The binding member is not limited as long as it can bind the carrier substrate and the image display device, and mechanical binding holes such as bolts and nuts can also be used. Preferably, it is easy to use an adhesive or an adhesive. The kind of the adhesive and the pressure-sensitive adhesive is not limited and known ones can be used.

4 is a view showing the application shape of the adhesive as the binding member according to an embodiment of the present invention, the adhesive may be applied to the upper portion of the carrier substrate or the lower portion of the flexible substrate, but may be continuously formed on the outside of the image display unit ( Fig. 2) may be formed discontinuously (Fig. 4).

The present invention is characterized by having a separation unit for stably separating the image display element formed on the carrier substrate and the flexible substrate. The separation part is formed on the flexible substrate, and is positioned between the image display part and the binding member to separate the carrier substrate and the image display element as shown in FIGS. 1 and 2. Since the separating portion is located between the image display portion and the binding member, the adhesive or the like, which is preferably used as the binding member, remains in the image display element, thereby contaminating the problem of contamination and subsequent cleaning process problems.

FIG. 5 is an enlarged view of region A of FIG. 2 and illustrates various forms of a separator according to an embodiment of the present invention. As shown, the separation part is incompletely cut on the lower surface of the flexible substrate (commonly referred to as 'half-cutting'), and the separation part is simply separated by pressing, etching, sandblasting, etc. after the manufacturing process. You can do it. The shape of the separation unit may be triangular, semi-elliptic, as shown, and may be formed in various shapes in addition to, and not limited to. Or it may be a form that is completely cut as shown in (d) but cut in the form of a dotted line.

6 is a schematic cross-sectional view of an image display device precursor according to another embodiment of the present invention. As shown, the separation auxiliary groove is further formed on the carrier substrate to correspond to all or a part of the separation unit. Due to the presence of the separation auxiliary groove, only the separation part can be selectively pressed, so that the carrier substrate and the image display device can be separated more easily.

FIG. 7 is a diagram illustrating a separation of the separator to separate the image display device and the carrier substrate. When the image display device precursor having the characteristics described above is manufactured, the separator may be separated to manufacture a desired image display device. .

8 is a schematic cross-sectional view of an image display device precursor according to another exemplary embodiment of the present invention, but is not limited thereto, but a plurality of images may be formed at a time by forming a plurality of image display units at predetermined intervals on one flexible substrate for mass production. It is preferable to form a display element.

1 and 2 are schematic cross-sectional views and plan views of an image display device precursor according to an embodiment of the present invention;

3 is a cross-sectional view of an organic light emitting device as an image display device according to an embodiment of the present invention;

Figure 4 is a view showing the application shape of the adhesive as the binding member according to an embodiment of the present invention,

FIG. 5 is an enlarged view of a region A of FIG. 2 and illustrates various forms of a separator according to an embodiment of the present invention;

6 is a schematic cross-sectional view of an image display device precursor according to another embodiment of the present invention;

7 is a cross-sectional view after separating the separation unit to separate the image display element and the carrier substrate;

8 is a schematic cross-sectional view of an image display device precursor according to another embodiment of the present invention.

** Description of the main symbols in the drawings **

1: Flexible substrate 2: Image display part

3: carrier substrate 4: binding member

5: separation part 6: cap

7: Separation aid groove 21: Anode

22: hole injection layer 23: hole transport layer

24: light emitting layer 25: electron transport layer

26: electron injection layer 27: cathode

Claims (8)

Flexible substrates; An image display unit formed in a predetermined area on the flexible substrate; A carrier substrate bound to a lower portion of the flexible substrate by a binding member positioned outside the image display unit; And And a separation unit formed on the flexible substrate and positioned between the image display unit and the binding member to separate the carrier substrate and the image display element. The image display device precursor of claim 1, wherein the flexible substrate is a metal foil. The image display device precursor of claim 1, wherein the separation unit is formed by cutting the flexible substrate with a dotted line or incompletely cutting the substrate. The image display device precursor of claim 3, further comprising a separation auxiliary groove formed in the carrier substrate corresponding to all or a part of the separation unit. The image display device precursor of claim 1, wherein the binding member is an adhesive or an adhesive. The image display device precursor of claim 1, wherein the flexible substrate has a thickness of 0.05 to 0.1T. The image display device precursor of claim 1, wherein the image display unit is an organic electroluminescent system. An image display device manufactured by separating the separating portion of the image display device precursor of any one of claims 1 to 7.

Images