KR100918062B1 - Organic light emitting diode device - Google Patents

Abstract

The present invention relates to an organic light emitting display device. An organic light emitting display device according to an embodiment of the present invention is formed between (i) a display panel, ii) a bezel housing the display panel, iii) a window member formed on the display panel, and iii) a display panel and a window member. An adhesive layer may be in close contact with the display panel and the window member.

Window part, adhesive layer, organic light emitting display, OLED

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 window portion.

Recently, among various display panels applied to display devices, display panels using organic light emitting diodes (OLEDs) have attracted attention.

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 light emitting layer, and an electron injection electrode, and is formed by energy generated when an exciton generated by combining electrons and holes in the organic light emitting 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 advantages of 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 window portion for protecting the module from the outside, and is typically formed between the module and the window portion with an air gap. However, when the air 겝 is formed between the module and the window as described above, there is a problem in that visibility is deteriorated due to a difference in refractive index between the window and the air 및 and a decrease in transmittance caused by the air 겝.

In addition, in the case of the organic light emitting display device applied to the mobile electronic device, there is a problem that it is difficult to achieve the slimming of the electronic device due to the air gap formed between the module and the window.

In order to solve such a problem, an organic light emitting display device including a window unit is provided.

An organic light emitting display device according to an embodiment of the present invention is formed between (i) a display panel, ii) a bezel housing the display panel, iii) a window member formed on the display panel, and iii) a display panel and a window member. An adhesive layer may be in close contact with the display panel and the window member.

The window member may include a window portion corresponding to the size of the display panel and an end portion protruding from the edge of the window portion to form an inner space.

In addition, the adhesive layer may be formed in the inner space, and the end portion may be formed in close contact with the display panel.

In addition, the adhesive layer may be formed to have a refractive index similar to that of the window member.

In addition, the window member and the adhesive layer may be formed of a material that transmits visible light.

In addition, the display panel may include a first substrate, a second substrate, and a coating layer formed on the second substrate.

On the other hand, the display device according to the embodiment of the present invention can be used in a portable digital device.

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

In addition, by providing an adhesive layer having a similar refractive index to the window portion, it is possible to prevent a decrease in visibility due to the difference in refractive index.

Meanwhile, in the organic light emitting diode display according to the exemplary embodiment of the present invention, an end portion is formed in the window part to make the thickness of the adhesive layer constant according to the end portion, and the thickness of the adhesive layer may be adjusted according to the height of the end portion. Therefore, the adhesive layer can be formed to a desired thickness and a constant thickness, thereby further improving the image quality of the organic light emitting display device.

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 the adhesive layer 40 and the window member 50 illustrated in FIG. 1 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 window member 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 generates a plurality of timing signals for applying the data driving signal and the gate driving signal at the direct time. 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 the state in which the display panel 10 is accommodated in the bezel 30, the flexible circuit board 18 fixed to the display panel 10 may be bent to the rear so that the printed circuit board ( 20) is located on the back of the bezel 30.

The bezel 30 accommodates the display panel 10 and is fixedly installed in a case of a real application 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 first direction of the display panel 10 (see FIG. 2, hereinafter same) 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 reduces the spread of light generated from the display panel 10 to improve visibility, and at the same time, when a defect occurs in the window member 50 to remove it, the adhesive layer 40 is displayed on the display panel. The display panel 10 may be protected by not being directly bonded to the 10.

The window member 50 is positioned on the display panel with the adhesive layer 40 interposed therebetween. The window member 50 has an interior space 500 in which the adhesive layer can be located. For example, the window member 50 may be formed in a rectangular shape with one side open. However, the display panel may be formed in various shapes according to the shape of the display panel.

The adhesive layer 40 is positioned in the internal space 500 and is formed to be in close contact with the coating layer 15 formed on the window member 50 and the display panel 10 without an air gap. In addition, the adhesive layer 40 is formed of a resin having a refractive index similar to that of the window member 50. Therefore, the fall of the oyster transmittance due to the air shock can be prevented, and the fall of visibility due to the difference in refractive index with the window member 50 can also be prevented.

Table 1 below is a table comparing the visibility of the organic light emitting diode display according to an exemplary embodiment of the present invention and a conventional organic light emitting display device (hereinafter referred to as Comparative Example) is formed.

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

Referring to Table 1, in the embodiment of the present invention, even if the adhesive layer 40 is present, the transmittance of the window itself is not lowered to 91.8%, as in the comparative example, while the reflectance is significantly reduced to 4.35%, thereby greatly improving visibility. It can be seen that the improvement.

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 outdoors. 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.

Hereinafter, the window member 50 and the adhesive layer 40 will be described in more detail with reference to FIG. 3.

3 is a simplified cross-sectional view taken along the line II of FIG. 2. Referring to FIG. 3, the window member 50 includes a window portion 53 corresponding to the size of the display panel and an end portion 51 protruding from an edge of the window portion 53 to form the internal space 500. . The end 51 guides the adhesive layer 40 positioned in the inner space 500 so that the adhesive layer 40 is formed to have a predetermined thickness. In addition, it is possible to form the adhesive layer 40 of the required height by adjusting the height of the end 51 in accordance with the applied product.

The adhesive layer 40 is an inner space 500, that is, a space formed by the end 51, the window part 53, and the coating layer 15 based on a state in which the window member 50 is coupled to the display panel 10. It is located in, and is bonded to both the window member 50 and the coating layer 15 so that the coating layer 15 and the window portion 53 and the air 겝 does not occur. However, the space where the adhesive layer 40 is located does not necessarily need to be a closed space. That is, the end 51 does not necessarily need to surround the entire adhesive layer 40, and may be formed in a sawtooth shape or only at four corner portions, for example.

As such, the end 51 guides the adhesive layer 40 so that the adhesive layer 40 may be evenly formed over the entire display area DA without variation in thickness. Therefore, the entire display area DA can be displayed.

On the other hand, the coating layer 15, the adhesive layer 40 and the window member 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 window member 50, and a transparent tape or resin may be used as the adhesive layer 40.

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 and 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.

2 is a combined perspective view of an organic light emitting diode display according to an exemplary embodiment of the present invention.

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

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

Display panel: 10 Coating layer: 15

Bezel: 30 Adhesive Layer: 40

Window members: 50

Claims (7)

Display panel; A bezel accommodating the display panel; A window member formed on the display panel; An adhesive layer formed between the display panel and the window member to closely contact the display panel and the window member; The window member includes a window portion corresponding to the size of the display panel and an end portion protruding from an edge of the window portion to form an inner space. The method of claim 1, The organic light emitting diode display, wherein the adhesive layer is formed in the internal space. The method of claim 1, The end portion is in direct contact with the display panel. The method of claim 1, The refractive index of the adhesive layer is similar to the refractive index of the window member. The method of claim 1, The window member 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 1, The display device is an organic light emitting display device used in a portable digital device.

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