KR20090099267A - Organic light emitting diode device - Google Patents

Abstract

An organic light emitting display device is provided to separate a display panel and a transparent protective unit smoothly by adhering an adhesive layer with low adhesive strength to the display panel. An organic light emitting display device includes a display panel(10), a bezel(30), a transparent protective layer, and an adhesive layer(40). The bezel receives the display panel. The transparent protective unit is formed on the display panel. The adhesive layer adheres the display to the transparent protective unit. The refractive index of the adhering layer is similar to the refractive index of the transparent protective unit. The adhesive layer includes a first adhesive layer and a second adhesive layer. The first and second adhesive layers are successively adhered to the display panel. The adhesive strength of the first adhesive layer is lower than the adhesive strength of the second adhesive layer. The adhesive strength of the first adhesive layer is below 85 N/mm. The thickness of the first adhesive layer is 10 to 90 um.

Description

Organic Light Emitting Display {ORGANIC LIGHT EMITTING DIODE DEVICE}

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device having a transparent protective part.

Recently, display panels using organic light emitting diodes (OLEDs) have been attracting attention due to rapidly developing semiconductor technologies among various display panels applied to display devices.

In an active driving type organic light emitting display using organic light emitting diodes, pixels, which are basic units of image expression, are arranged on a substrate in a matrix manner, and thin film transistors (TFTs) and organic light emitting diodes are disposed for each pixel. Control the pixels independently. The organic light emitting device includes a hole injection electrode, an organic emission layer, and an electron injection electrode, and is formed by energy generated when an exciton generated by combining electrons and holes in an organic emission layer falls from an excited state to a ground state. Light emission is achieved.

In this manner, the organic light emitting diode display has a self-luminous property and, unlike the liquid crystal display, does not require a separate light source, thereby reducing thickness and weight. In addition, the organic light emitting diode display has high quality characteristics such as low power consumption, high luminance, and high response speed, and thus is suitable for use in mobile electronic devices.

In general, an organic light emitting diode display includes a display panel including two substrates fixed by a sealant, a bezel coupled to the display panel, and a printed circuit board electrically connected to the display panel through a flexible circuit board. Configure

The organic light emitting diode display may further include a transparent protective part for protecting the module from the outside. In general, the organic light emitting diode display is formed separately with an air gap between the module and the window part. However, when an air gap is formed between the module and the window as described above, visibility may be deteriorated due to a difference in refractive index between the window and the air gap and a decrease in transmittance caused by the air gap.

In addition, if a defect occurs in the transparent protective part while installing the transparent protective part for protecting the display panel, the transparent protective part adhered to the display panel should be separated. The transparent protective part may not be easily removed and may affect the display panel. have.

An organic light emitting display device having an integrated window part and having a convenient rework is provided.

An organic light emitting diode display according to an exemplary embodiment of the present invention includes a display panel, a bezel that accommodates the display panel, a transparent protective part formed on the display panel, and a display panel and a transparent protective part. The adhesive layer may include an adhesive layer, wherein the adhesive layer includes a first adhesive layer and a second adhesive layer sequentially attached to the display panel, and the adhesive strength of the first adhesive layer is smaller than that of the second adhesive layer.

The adhesive strength of the first adhesive layer may be less than 85 N / mm.

The first adhesive layer may have a thickness of about 10 μm to about 90 μm.

The first adhesive layer may include a fluorine-based high molecular compound.

The refractive index of the adhesive layer may be similar to the refractive index of the transparent protective part.

The transparent protective part and the adhesive layer may transmit visible light.

The display panel may include a first substrate, a second substrate, and a coating layer formed on the second substrate, and the coating may be a polarizing film.

The display device may be used in a portable digital device.

The organic light emitting diode display according to the exemplary embodiment of the present invention may include a transparent protection unit integrally to prevent a decrease in transmittance caused by an air gap. Therefore, the visibility of the organic light emitting display device can be improved.

In addition, by providing an adhesive layer having a refractive index similar to that of the transparent protective part, it is possible to prevent a decrease in visibility due to a difference in refractive index.

On the other hand, the organic light emitting diode display according to the exemplary embodiment of the present invention includes a plurality of adhesive layers having different adhesive strengths, and among them, an adhesive layer having a relatively small adhesive strength is adhered to the display panel so as not to affect the display panel during reworking. The display panel and the transparent protective part can be separated smoothly.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. When a portion of a layer, film, region, plate, or the like is said to be "on" or "on" another portion, this includes not only when the other portion is "right over" but also when there is another portion in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

In addition, when a part of the specification is said to be "connected" to another part, this includes the case where it is "directly connected". In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

1 is an exploded perspective view of an organic light emitting diode display 100 according to an exemplary embodiment of the present invention. FIG. 2 is a perspective view of a state in which the adhesive layer 40 and the transparent protective part 50 shown in FIG. 1 are coupled to the display panel 10 and accommodated in the bezel 30.

1 and 2, an organic light emitting diode display 100 according to an exemplary embodiment of the present invention includes a display panel 10, an adhesive layer 40, a transparent protective part 50, and a bezel 30.

The display panel 10 includes a first substrate 12 and a second substrate 14 formed smaller in size than the first substrate 12. The display panel 10 is provided with a display area DA in which actual image display is performed. For example, when the display device 100 has an active matrix (AM) structure, the organic light emitting diode and the thin film transistors driving the organic light emitting diode and the thin film transistor may be formed on the first substrate 12 corresponding to the display area DA. Electrically connected wiring can be formed. In addition, a pad region PA is formed in a portion of the first substrate 12 that extends from the second substrate 14, and in the pad region PA, pads (not shown) extending from wirings of the display area DA are formed. Is located. These pads are electrically connected to the printed circuit board 20 through a flexible printed circuit board 18.

The integrated circuit chip 16 is mounted on the pad area PA of the first substrate 12 to control the display panel 10. The integrated circuit chip 16 is a time when the data driving signal and the gate driving signal are directly cut off. Generate a plurality of timing signals for applying. The signals are applied to the data line and the gate line of the display panel 10, respectively. A protective film 22 is formed around the integrated circuit chip 16 to protect the integrated circuit chip 16.

Electronic components (not shown) for processing driving signals are mounted on the printed circuit board 20, and connectors (not shown) for transmitting external signals to the printed circuit board 20 are installed. As shown in FIG. 2, in a state in which the display panel 10 is accommodated in the bezel 30, the flexible printed circuit board 18 fixed to the display panel 10 may be bent to the rear so that the printed circuit board 10 is bent. The substrate 20 is located on the back side of the bezel 30.

The bezel 30 accommodates the display panel 10 and is fixedly installed in a case of a performance product such as a portable digital device.

The bezel 30 includes a bottom portion 302 corresponding to the size of the display panel 10 and a cut portion 304 formed at a right angle with a predetermined height from an edge of the bottom portion 302. Here, the cut portion 304 on the side where the flexible printed circuit board 18 is disposed is cut in consideration of its size so that the flexible printed circuit board 18 can be located without interference. The bezel may be formed in various shapes to accommodate the display panel 10 according to the shape of the display panel 10.

The bezel 30 may be formed of a material having a high strength to protect the display panel 10. For example, the bezel 30 may be formed of an aluminum alloy having a certain strength.

The display panel 10 may further include a coating layer 15 formed on the second substrate 14.

The coating layer 15 is formed on the light emitting surface of the display panel 10 to protect the display panel 10 and to improve visibility. The coating layer 15 may be formed of, for example, a polarizing plate. The coating layer 15 improves visibility by reducing the spread of light generated from the display panel 10, and then, when a defect occurs in the transparent protective part 50 and is to be removed, the adhesive layer 40 is formed on the display panel ( The display panel 10 may be protected by not directly adhering to 10).

The transparent protective part 50 is positioned on the display panel 10 with the adhesive layer 40 interposed therebetween. That is, the adhesive layer 40 is positioned between the transparent protective part 50 and the display panel 10 to bring the adhesive layer 40 into close contact with each other.

In this embodiment, the adhesive layer 40 includes a first adhesive layer 401 and a second adhesive layer 402. The first adhesive layer 401 and the second adhesive layer 402 are sequentially attached to the display panel 10, and the adhesive layers 401 and 402 are disposed between the display panel 10 and the transparent protective part 50. It is closely formed so that there is no air gap.

The above-described coating layer 15, the adhesive layer 40 and the transparent protective portion 50 is formed of a material that can transmit visible light. For example, a polymer material or glass may be used as the coating layer 15 and the transparent protective part 50, and a resin or the like may be used as the adhesive layer 40. In addition, the adhesive layer 40 may include a material having a refractive index similar to that of the transparent protective part 50.

On the other hand, the first adhesive layer 401 has a smaller adhesive strength than the second adhesive layer 402. The first adhesive layer 401 and the second adhesive layer 402 function to bond the display panel 10 and the transparent protective part 50 to each other, but attach the transparent protective part 50 to the display panel 10. When a defect occurs in the transparent protection unit 50, a rework to separate it from the display panel 10 may be necessary.

In this case, the first adhesive layer 401 in contact with the display panel 10 has a smaller adhesive strength than the second adhesive layer so that the transparent protective part 50 is smoothly separated from the display panel 10. In detail, the first adhesive layer 401 is adhered to the coating layer 15 attached to the display panel 10, and when reworked, the first adhesive layer 401 is applied to the coating layer 10 without affecting the display panel 10. 15).

To this end, the first adhesive layer 401 may be in close contact with the transparent protection unit 50 and the display panel 10, and the transparent protection unit 50 and the display panel 10 may be separated when a force is applied from the outside as necessary. It is desirable to have an adhesive strength that can be achieved. For example, the first adhesive layer 401 may have an adhesive strength of less than 85 N / mm.

The first adhesive layer 401 may be formed to a thickness of 10㎛ to 90㎛. If the thickness of the first adhesive layer 401 is too large, the overall thickness of the organic light emitting diode display 100 may increase, so there may be a limitation in manufacturing a thin organic light emitting diode display.

The first adhesive layer 401 includes a fluorine-based high molecular compound. For example, the first adhesive layer 401 may include metal fluoride materials such as antifouling coated NaF, LiF, AlF3, and YF3.

3 is a cross-sectional view taken along line III-III of FIG. 2.

Referring to FIG. 3, the transparent protection unit 50 is positioned on the display panel 10 corresponding to the size of the display panel 10.

A coating layer 15 is attached to the light emitting surface of the display panel 10, and an adhesive layer 40 is formed between the coating layer 15 and the transparent protective part 50 to bond them together. In the adhesive layer 40, the first adhesive layer 401 contacts the coating layer 15 on the display panel 10 based on a state in which the transparent protective part 50 is coupled to the display panel 10. 402 is in contact with the transparent protective part 50. As a result, the display panel 10 and the transparent protective part 50 may be completely in contact with each other.

As a result, a decrease in transmittance due to an air gap between the display panel 10 and the transparent protective part 50 can be prevented, and the adhesive layer 40 and the transparent protective part 50 are made of a material having a similar refractive index. The decrease in visibility due to the difference in refractive index can also be prevented.

In addition, since the adhesive strength of the first adhesive layer 401 is smaller than that of the second adhesive layer 402, the transparent protective part 50 may be separated from the coating layer 15 while protecting the display panel 10 during rework.

Table 1 below compares the visibility of the organic light emitting diode display according to the exemplary embodiment of the present invention and the organic light emitting diode display (hereinafter referred to as Comparative Example) having a conventional air gap.

Example Comparative example Luminance (㏅ / ㎡) 206 180 Y percentage 114 100 External light contrast ratio (%) 2.45 1.74 External color reproduction (%) 14.5 5.3 Window transmittance (%) 91.8 91.8 reflectivity(%) 4.35 7.44

The external light contrast ratio and external light color reproducibility of Table 1 are measured values under irradiation with 10,000 lux of light from the outside.

Referring to Table 1, in the embodiment of the present invention, even if the adhesive layer 40 is present, the reflectance (including the display panel and the transparent protective part) is 4.35, while the transmittance of the window itself is not lowered to 91.8% as in the comparative example. It can be seen that the visibility is greatly improved due to a significant decrease in%.

In addition, luminance, external light contrast ratio, external light color reproducibility, etc. are greatly improved compared to the comparative example, and when the organic light emitting diode display according to the exemplary embodiment of the present invention is applied to a mobile device, a clearer image can be obtained even outdoors.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims, the detailed description of the invention, and the accompanying drawings. Naturally, it belongs to the range of.

1 is an exploded perspective view of an organic light emitting diode display according to an exemplary embodiment of the present invention.

FIG. 2 is a combined perspective view of the organic light emitting diode display illustrated in FIG. 1.

3 is a cross-sectional view taken along line III-III of FIG. 2.

<Description of reference numerals for the main parts of the drawings>

10; Display panel 15; Coating layer

30; Bezel 40; adhesive layer 50; Transparent protector

Claims (9)

Display panel Bezel to accommodate the display panel A transparent protective part formed on the display panel; An adhesive layer formed between the display panel and the transparent protective part to closely contact the display panel and the transparent protective part; The adhesive layer includes a first adhesive layer and a second adhesive layer sequentially attached to the display panel, and the adhesive strength of the first adhesive layer is smaller than the adhesive strength of the second adhesive layer. The method of claim 1, The organic light emitting diode display of which the adhesive strength of the first adhesive layer is less than 85 N / mm. The method of claim 1, An organic light emitting display device having a thickness of the first adhesive layer between 10 μm and 90 μm. The method of claim 1, The first adhesive layer includes a fluorine-containing high molecular compound. The method of claim 1, The refractive index of the adhesive layer is similar to the refractive index of the transparent protective part. The method of claim 1, The transparent protective part and the adhesive layer transmit the visible light. The method of claim 1, The display panel includes a first substrate, a second substrate, and a coating layer formed on the second substrate. The method of claim 7, wherein The organic light emitting display device wherein the coating layer is a polarizing film. The method of claim 1, The display device is an organic light emitting display device used in a portable digital device.

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