KR102295613B1 - Flexible organic light-emitting diode display - Google Patents

Abstract

A flexible organic light emitting display device capable of satisfying ESD safety standards by forming an electrostatic discharge path, comprising: a flexible substrate on which an organic light emitting pixel array including an organic light emitting diode is formed; an antistatic treatment thin film polarizing plate positioned on the upper surface of the flexible substrate; a conductive encapsulation substrate formed under the non-display area of the substrate; In the thin organic light emitting display device comprising an adhesive film for adhering the conductive encapsulation substrate to a lower mechanism, a first conductive portion formed between the antistatic treatment surface of the thin film polarizing plate and the conductive encapsulation substrate; It is configured to include an electrostatic discharge part made of a second conductive part formed between the metal surface of the encapsulation substrate and the lower mechanism, thereby preventing static spotting by forming an electrostatic path, thereby satisfying static electricity safety standards.

Description

Flexible organic light-emitting diode display

The present invention relates to a flexible organic light emitting display device, and more particularly, to a flexible organic light emitting display device capable of satisfying ESD safety standards by forming an electrostatic discharge path.

As the information society develops, the demand for a display device for displaying an image is increasing in various forms. Accordingly, in recent years, various display devices such as a liquid crystal display (LCD), a plasma display panel (PDP), and an organic light emitting display (OLED) have been used. Since the organic light emitting diode display is a self-luminous device, it consumes less power and can be made thinner than a liquid crystal display that requires a backlight. In addition, the organic light emitting diode display has a wide viewing angle and a fast response speed. The organic light emitting diode display is expanding its market while competing with the liquid crystal display as process technology has advanced to the level of large-screen mass production.

Pixels of the organic light emitting diode display include organic light emitting diodes (hereinafter, referred to as "OLEDs"), which are self-luminous devices. Accordingly, it may be referred to as an organic light emitting diode display. The organic light emitting diode display may be variously classified according to a type of a light emitting material, a light emitting method, a light emitting structure, a driving method, and the like. The organic light emitting diode display may be divided into fluorescence emission and phosphorescence emission according to a light emission method. The organic light emitting diode display may be divided into a top emission structure and a bottom emission structure according to a light emitting structure. In addition, the organic light emitting diode display may be divided into a passive matrix OLED (PMOLED) and an active matrix OLED (AMOLED) according to a driving method.

Meanwhile, a flexible display using an organic light emitting diode display is being developed. The flexible display reproduces the input image on the screen of the display panel on which the plastic OLED is formed. A plastic OLED is formed on a flexible plastic substrate. Flexible displays can implement various designs and have advantages in portability and durability. The flexible display may be implemented as a display of various types, such as a bendable display, a foldable display, and a rollable display. Such a flexible display can be applied to not only mobile devices such as smart phones and tablet PCs, but also TVs (Televisions), automobile displays, and wearable devices, and its application fields are expanding. In a rollable display, the display panel can be rolled up and, if necessary, can be unfolded.

1 is an exemplary view illustrating a cross-section of a non-display area in a flexible organic light emitting diode display according to the related art.

The flexible organic light emitting display device 1 may include a flexible substrate 20 and a cover member 50 . The flexible substrate 20 is a thin film transistor array substrate and includes a pixel array. The pixel array includes a plurality of pixels having an organic light emitting device provided in a pixel area defined by pixel driving lines including a gate line and a data line and displaying an image according to a signal supplied to the pixel driving lines. A gate driving built-in circuit (not shown) for supplying a gate (or scan) signal to a gate line is provided in the non-display area on the vertical side of the flexible substrate. The gate driving built-in circuit is formed together with the thin film transistor manufacturing process of each pixel so as to be connected to each gate line.

A polarizing plate 10 to which an antistatic treatment film 11 made of a very thin metal plate made of an invar material is attached is provided on one surface of the flexible substrate 20 . In order to prevent moisture from penetrating into the pixel array of the flexible substrate 20 , the encapsulation substrate 30 is provided under the flexible substrate 20 . The encapsulation substrate 30 is made of a metal surface 31 and an adhesive surface 32 to have conductivity. The encapsulation substrate 30 is adhered to the lower cover member mechanism (Back bar) 50 by the adhesive film 40 . The cover member serves as a protective cover for protecting the flexible organic light emitting diode display 1 from external impact. In addition, a non-conductive resin 60 is filled between the encapsulation substrate 30 and the polarizing plate 10 .

The display device must have performance suitable for electrostatic standards. In order to test the static electricity standard, a device (ESD gun) capable of generating static electricity (Electrostatic Discharge, hereinafter referred to as ESD) on the display surface is used to provide ±15 KV to generate static electricity.

Accordingly, as shown in FIG. 2A , mura is generated on the display surface due to static electricity. In a display device having performance conforming to the standard, stains due to static electricity should disappear after a predetermined time has elapsed. A typical organic light emitting diode display uses an antistatic polarizer, so it can satisfy this static electricity standard.

However, a flexible display, particularly a rollable display, has a roll shape, that is, a film shape that is flexible and can be rolled up. Accordingly, the thickness of the display panel is relatively thinner than that of a general organic light emitting diode display device. That is, the display panel of the rollable display uses an etching technique to reduce the thickness of the panel glass by etching the polarizing plate attachment portion except for the COF (Chip on Film) bonding portion to reduce the thickness. Therefore, even if the polarizing plate is antistatically treated, the thickness of the polarizing plate and the thickness of the display panel are thin, and since a separate static electricity path is not formed, static electricity affects the internal circuit of the panel. For this reason, as shown in FIG. 2B , there is a problem in that stains due to electrostatic discharge are continuously displayed even after several seconds to several minutes have elapsed.

The present invention has been devised to solve this problem, and by forming an electrostatic path in the flexible organic light emitting display device, it is possible to prevent static electricity from being introduced into the pixel along the electrode wiring of the device to provide a flexible organic light emitting display device. aim to

Another object of the present invention is to provide a flexible organic light emitting diode display capable of satisfying the requirements of static electricity safety standards.

In a flexible organic light emitting display device according to the present invention for achieving these objects, a conductive material is added between the antistatic treatment surface of a polarizing plate and an encapsulation substrate, and a conductive tape or a conductive gasket is provided between the encapsulation substrate and the circuit ground. ) to form an electrostatic path.

A flexible organic light emitting display device according to the present invention includes: a flexible substrate on which an organic light emitting pixel array including an organic light emitting diode is formed; an antistatic treatment thin film polarizing plate positioned on the upper surface of the flexible substrate; a conductive encapsulation substrate formed under the non-display area of the substrate; In the thin organic light emitting display device comprising an adhesive film for adhering the conductive encapsulation substrate to a lower mechanism, a first conductive portion formed between the antistatic treatment surface of the thin film polarizing plate and the conductive encapsulation substrate; It is characterized in that the detailed configuration includes an electrostatic discharge unit composed of a second conductive unit formed between the metal surface of the encapsulation substrate and the lower mechanism.

The polarizing plate may be a linear polarizing plate.

A retardation plate may be formed on the flexible substrate.

The retarder may be a λ/4 retarder.

The flexible substrate may include at least one of glass, an organic material, an inorganic material, and a metal.

The flexible substrate may be stretchable, foldable, or rollable.

The flexible organic light emitting display device according to the present invention may be stretchable, foldable, or rollable.

The flexible organic light emitting display device according to the present invention may include a touch panel on which a touch sensor unit is formed.

The touch sensor unit may be formed of a capacitive type.

In the flexible organic light emitting display device according to a preferred embodiment of the present invention, the first conductive part may be formed of a conductive resin or silver dotting (Ag dotting).

In the flexible organic light emitting display device according to a preferred embodiment of the present invention, the second conductive part may be formed of a conductive tape or a conductive gasket.

In the flexible organic light emitting display device according to the present invention, the flexible substrate is formed of a rollable substrate on which a polarizing plate attachment portion is etched except for a chip on film (COF) bonding region.

The flexible organic light emitting display device according to the present invention may exhibit the following effects.

First, electrostatic safety standards can be satisfied by adding a conductive material between the polarizing plate and the encapsulation substrate and forming an electrostatic path between the encapsulation substrate and the lower device.

Second, it is possible to prevent the effect of static electricity on the pixels of the display panel.

1 is an exemplary diagram illustrating a cross-section of one side of a flexible organic light emitting diode display according to the related art.
2A and 2B are exemplary views showing the occurrence of static smear.
3A and 3B are exemplary views illustrating a cross-section of one side of a flexible organic light emitting diode display according to an embodiment of the present invention.
4A and 4B are exemplary views illustrating a cross-section of one side of a flexible organic light emitting diode display according to another embodiment of the present invention.
5 is an exemplary view illustrating a cross-section corresponding to a plan view of one side of a flexible organic light emitting display device according to an embodiment of the present invention.
6 is an exemplary view in which an electrostatic discharge unit is formed in a non-display area corresponding to an outer portion of a flexible organic light emitting diode display according to an embodiment of the present invention.

With respect to the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are only exemplified for the purpose of describing the embodiments of the present invention, the embodiments of the present invention may be implemented in various forms and It should not be construed as being limited to the described embodiments.

Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms such as first, second, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is mentioned that a certain element is "directly connected" or "directly connected" to another element, it should be understood that there is no other element in the middle. Other expressions describing the relationship between elements, such as "between" and "immediately between" or "neighboring to" and "directly adjacent to", should be interpreted similarly.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this application, terms such as "comprises" or "having" are intended to designate that the disclosed feature, number, step, action, component, part, or combination thereof exists, but includes one or more other features or numbers, It should be understood that the possibility of the presence or addition of steps, operations, components, parts or combinations thereof is not precluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be construed as indicating meanings consistent with the meanings in the context of the related art, and should not be construed in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

On the other hand, when an embodiment can be implemented differently, functions or operations specified in a specific block may occur differently from the order specified in the flowchart. For example, two consecutive blocks may be performed substantially simultaneously, or the blocks may be performed in reverse according to a related function or operation.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. 3A and 3B are exemplary views illustrating a cross-section of one side of a flexible organic light emitting diode display according to an embodiment of the present invention.

As shown in FIG. 3A , a flexible organic light emitting display device according to an embodiment of the present invention includes a flexible substrate 20 on which an organic light emitting pixel array including an organic light emitting diode is formed; an antistatic treatment thin film polarizing plate 10 positioned on the upper surface of the flexible substrate 20; a conductive encapsulation layer 30 formed under the non-display area of the flexible substrate 20; In the thin organic light emitting display device comprising an adhesive film (40) for adhering the conductive encapsulation substrate (30) to the lower mechanism (50), between the antistatic treatment surface of the thin film polarizing plate and the conductive encapsulation substrate and an electrostatic discharge unit 70 including a first conductive part configured and a second conductive part configured between the metal surface of the conductive encapsulation substrate and a lower device.

The polarizing plate may be a linear polarizing plate. The conductive encapsulation substrate 30 includes an adhesive surface (FSA: 31) and a metal surface (FSM: 32). A retardation plate (not shown) may be formed on the flexible substrate. The retarder may be a λ/4 retarder. The flexible substrate 20 may include at least one of glass, an organic material, an inorganic material, and a metal. The flexible substrate 20 may be stretchable, foldable, or rollable. The flexible organic light emitting diode display 2 according to the present invention may be stretchable, foldable, or rollable. The flexible organic light emitting display device according to the present invention may include a touch panel (not shown) on which a touch sensor unit (not shown) is formed. The touch sensor unit may be formed of a capacitive type.

First, FIG. 3A shows an embodiment in which a conductive resin 71 is used as a first conductive part and a conductive tape 72 is used as a second conductive part. An electrostatic path when static electricity is generated will be described with reference to FIG. 3A. When a voltage capable of generating static electricity is provided on the surface of the polarizing plate 10 (①), the static electricity moves to the antistatic treatment film 11 formed on one surface of the polarizing plate 10 (②). The antistatic treatment film 11 may be formed of a very thin metal plate made of an invar material. Static electricity moves from the antistatic treatment film 11 to the conductive resin 71 ((3)). Then, the static electricity moves to the metal surface 32 of the conductive encapsulation substrate 30 in contact with the conductive resin 71 (④). Again, the static electricity moves to the lower mechanism 50 (⑥) through the conductive tape 72 located between the metal surface 32 and the grounded back bar 50 (⑤).

3B shows an embodiment in which a conductive resin is used as the first conductive part 71 and a conductive gasket 73 is used as the second conductive part. move through

Meanwhile, FIGS. 4A and 4B are exemplary views illustrating a cross-section of one side of a flexible organic light emitting diode display according to another exemplary embodiment of the present invention. First, FIG. 4A shows that, unlike the exemplary views of FIGS. 3A and 3B, a non-conductive resin 60 is filled in the lower portion of the polarizing plate 10, and between the polarizing plate 10 and the conductive prevention substrate 30 as a first conductive part. This is an embodiment in which silver (Ag) is doped and the conductive tape 72 is provided as the second conductive part. In the configuration example of FIG. 4B, a non-conductive resin 60 is filled in the lower portion of the polarizing plate 10, and silver (Ag) is doped (Ag) as a first conductive part between the polarizing plate 10 and the conductive prevention substrate 30 . dotting), and is an embodiment provided with a conductive gasket (gasket) 73 as the second conductive part. In this configuration as well, static electricity moves through the same path as shown in FIG. 3A above.

5 is an exemplary view in which an electrostatic discharge unit is formed in a non-display area corresponding to an outer portion of a flexible organic light emitting diode display according to an embodiment of the present invention. It shows that a plurality of electrostatic discharge units 70 are disposed outside the polarizing plate 10 .

6 is an exemplary view illustrating a cross-section corresponding to a plan view of one side of a flexible organic light emitting display device according to an embodiment of the present invention. (A) is a plan view of one side of the flexible organic light emitting diode display indicated by “C” in FIG. 5 , and (B) is an exemplary view illustrating a cross-section taken along line I-I' in FIG. 5 .

As shown, the flexible substrate 20 includes an etched region 21 and an unetched region 22 . That is, in this exemplary view, the use of a rollable substrate is shown as an example, and the flexible substrate 20 except for the chip on film (COF) bonding region 21 is etched, and a polarizing plate 10 is formed thereon. It can be seen that the etched part has been etched. Accordingly, it can be seen that the thickness of the etched region 21 is relatively thinner than the thickness of the unetched region 22 . In addition, it indicates that silver dotting (Ag dotiing) having a conductive component is disposed under the polarizing plate 10 . It can be seen that the adhesive surface of the conductive encapsulation substrate 30 is disposed under the flexible substrate 20 , and the silver dot 74 is connected to the metal surface of the conductive encapsulation substrate.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that it can be done.

1,2: flexible organic light emitting display device 10: polarizing plate
11: antistatic treatment film 20: flexible substrate
30: conductive encapsulation substrate 31: adhesive surface
32: metal side 40: adhesive film
50: lower mechanism 60: non-conductive resin
70: electrostatic discharge unit 71: conductive resin
72: conductive tape 73: conductive gasket
74: silver dotting (Ag dotting)

Claims (6)

a flexible substrate on which an organic light emitting pixel array including an organic light emitting diode is formed;
an antistatic treatment thin film polarizing plate positioned on the upper surface of the flexible substrate;
a conductive encapsulation substrate formed under the non-display area of the substrate;
In the thin organic light emitting display device comprising an adhesive film for adhering the conductive encapsulation substrate to a lower mechanism,
An electrostatic discharge unit comprising a first conductive portion formed between the antistatic treatment surface of the thin film polarizing plate and the conductive encapsulation substrate, and a second conductive portion formed between the metal surface of the conductive encapsulation substrate and a lower device. A flexible organic light emitting display device comprising: The flexible organic light-emitting display device of claim 1 , wherein the first conductive part is made of a conductive resin. The flexible organic light emitting diode display of claim 1 , wherein the first conductive part is silver dotted. The flexible organic light emitting diode display of claim 2 or 3, wherein the second conductive part is a conductive tape. The flexible organic light emitting diode display of claim 2 or 3, wherein the second conductive part is a conductive gasket. The flexible organic light emitting display device of claim 1 , wherein the flexible substrate is formed of a rollable substrate on which a polarizing plate attachment portion is etched except for a chip on film (COF) bonding region.

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