KR100889531B1 - Organic light emitting diode display - Google Patents

Abstract

The organic light emitting diode is provided to improve the strength characteristic by optimizing the thickness of the bezel and display panel. The organic light emitting diode(100) comprises the display panel(10), and the first bezel(30) and the second bezel(32). The first bezel received the display panel in the lower part of the display panel. The second bezel is coupled with the first bezel in the top of the display panel. The second bezel protects the display panel. The bottom part of the first bezel is parallel to the light emitting surface of the display panel. The cover unit of the second bezel covers the edge of the light emitting surface of the display panel.

Description

Organic light emitting display device {ORGANIC LIGHT EMITTING DIODE DISPLAY}

The present invention relates to an organic light emitting display device, and more particularly, to a module of an organic light emitting display device.

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

Unlike the liquid crystal display in which a structure such as a backlight unit is positioned between the display panel and the bezel, there is no other structure between the display panel and the bezel. Thus, when an accident occurs such as a drop, an impact is applied to the display panel. There is a vulnerability that can be transmitted as it is, the display panel can be easily broken.

Accordingly, the organic light emitting display device may perform an excellent function as a display device only when the organic light emitting display device has a property that is not easily broken due to a fall due to a user's mistake according to its use environment.

An organic light emitting display device having excellent mechanical strength characteristics is provided.

An organic light emitting diode display according to an exemplary embodiment includes a display panel, a first bezel accommodating the display panel at a lower portion of the display panel, and a second bezel fastening to the first bezel at an upper portion of the display panel to protect the display panel. When the thickness of the display panel is T1 and the sum of the thickness of the bottom portion of the first bezel parallel to the light emitting surface of the display panel and the thickness of the cover portion of the second bezel covering the edge of the light emitting surface is T2, Satisfies the conditions.

0.2 ≤ T2 / T1 ≤ 2.5

T2 may be greater than T1.

The display panel may have a thickness of about 0.4 μm to about 1.2 μm.

The first bezel may include a first cut portion protruding from an edge of the bottom portion, and a thickness of the bottom portion may be 0.12 μm to 0.5 μm.

The second bezel may include a second cut portion protruding from an edge of the cover portion to surround the first cut portion of the first bezel, and the cover portion may have an opening for opening an emission surface, and the cover portion may have a thickness of 0.12. May be in the range from 0.5 μm to 0.5 μm.

Protruding directions of the first cut portion and the second cut portion may be opposite to each other.

The strength of the first bezel may be greater than the strength of the second bezel.

The first bezel may include a material selected from the group consisting of stainless steel (SUS), cold plate cold commercial (SPCC), aluminum and nickel-silver alloys.

The display apparatus may further include a buffer tape disposed between the display panel and the first bezel.

The display device may further include a polarizing tape disposed between the display panel and the second bezel.

The display device may be portable.

According to an exemplary embodiment of the present invention, the mechanical strength of the organic light emitting diode display may be improved by optimizing the thickness of the display panel and the bezel housing the same, thereby improving warpage and strength characteristics of the display panel.

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 addition, in order to clearly express the several layers and areas in the drawing, the thickness was shown to enlarge. 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 illustrating an organic light emitting diode display 100 according to an exemplary embodiment of the present invention, and FIG. 2 illustrates that the display panel 10 illustrated in FIG. 1 includes a first bezel 30 and a second bezel 32. It is a perspective view showing the state accommodated in).

1 and 2, the organic light emitting diode display 100 includes a display panel 10 displaying an image, a first bezel 30 and a second bezel 32 accommodating and fixing the display panel 10. It includes.

The display panel 10 may be provided for mobile, for example, a cellular phone. However, in the present invention, the display panel 10 may be provided for a large display such as a television in addition to the mobile.

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 the 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, the flexible printed circuit board 18 fixed to the display panel 10 while the display panel 10 is accommodated in the first bezel 30 is bent to the rear of the first bezel 30. The printed circuit board 20 is positioned on the rear surface of the first bezel 30.

The organic light emitting diode display 100 of the present exemplary embodiment includes a first bezel 30 and a second bezel 32, the first bezel 30 corresponds to a bottom bezel, and the second bezel 32 corresponds to a top bezel. Yes.

The first bezel 30 is positioned below the display panel 10 to accommodate the display panel 10 and is fixedly installed in a case of a real application product.

The first bezel 30 has a bottom portion 302 corresponding to the size of the display panel 10 and a first cut portion 304 formed at a right angle with a predetermined height from an edge of the bottom portion 302. It includes. Here, the first 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 positioned without interference.

The second bezel 32 is positioned above the display panel 10, and surrounds the upper portion of the display panel 10 and the first cut portion 304 of the first bezel 30. Combined with

The second bezel 32 is disposed at a right angle with a cover part 324 covering the edge of the light emitting surface 141 and the pad area PA of the display panel 10 and the edge of the cover part 324. And a second cut portion 326 formed.

The cover portion 324 is formed with an opening 322, which is widely known as a window, formed on a surface parallel to the light emitting surface 141. Since the cover part 324 covers the edge of the light emitting surface 141, the cover 324 may be absorbed before the display panel 10 to protect the display panel 10. Accordingly, the cover part 324 opens the light emitting surface 141 while protecting a portion of the display panel 10, particularly the light emitting surface 141, to display an image implemented in the display panel 10 to the user.

The second cut portions 326 are coupled to each other while covering the first cut portions 304 of the first bezel 30. At this time, the first cut portion 304 and the second cut portion 326 are disposed to protrude in opposite directions from the bottom portion 302 and the cover portion 324, respectively. That is, the first cut part 304 may protrude along the + z axis direction from the bottom part 302, and the second cut part 326 may protrude along the −z axis direction from the cover part 324. have. Here, the second cut portion 326 on the side where the flexible printed circuit board 18 is disposed may be positioned so that the flexible printed circuit board 18 can be positioned without interference, like the first cut portion 304. Incision is taken into account in size.

Meanwhile, the first bezel 30 and the second bezel 32 may have different strengths from each other. Since the first bezel 30 supports and accommodates internal components including the display panel 10, the first bezel 30 may be formed of a material having a relatively high strength to protect the internal components well. For example, the first bezel 30 may be made of metal materials such as stainless steel having a certain strength, stainless plate cold commercial (SPCC), aluminum, and nickel-silver alloy. Can be. Therefore, the display panel 10 can be effectively protected from external shock. Of course, the material of the first bezel 30 is not limited to those described above.

Since the second bezel 32 is in contact with the light emitting surface 141 of the display panel 10 whose substrate is usually made of glass, the strength of the second bezel 32 should be relatively low so that the display panel 10 is not broken by an impact. Therefore, the second bezel 32 can be manufactured from a resin material. For example, the second bezel 32 may be made of a transparent resin material that may transmit visible light or may be made of an opaque resin material. Although the second bezel 32 has been described as including the opening 322 in the present embodiment, the present invention is not limited thereto. If the second bezel 32 is made of a transparent resin material, the cover part 324 of the second bezel 32 does not include the opening 322 and the light emitting surface 141 is parallel to the light emitting surface 141. It may be formed to cover the whole.

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

Referring to FIG. 3, the display panel 10 is accommodated in the first bezel 30, and the second bezel 32 covers the display panel 10 and the first bezel 30.

In this case, the cover part 324 of the second bezel 32 covers a part of the display panel 10, that is, the edge of the light emitting surface 141, and the second cut part 326 of the second bezel 32 It is coupled to the first bezel 30 while surrounding the first cut portion 304. In particular, the cover part 324 is positioned higher than the light emitting surface 141 with respect to the z-axis, and when the user inadvertently drops the organic light emitting display device 100, the cover part 324 comes into contact with the floor before the display panel 10. In addition, since the opening 322 formed in the cover part 324 provides an air layer with respect to the light emitting surface 141 of the display panel 10, the second bezel 32 absorbs an external shock before the display panel 10. can do.

Accordingly, the display panel 10 may be effectively protected from external shock by strengthening the strength of the first bezel 30 and the second bezel 32.

To this end, the organic light emitting diode display 100 of the present exemplary embodiment may optimize the thickness of the display panel 10, the first bezel 30, and the second bezel 32.

When the thickness of the display panel 10 is T1 and the sum of the thicknesses of the first bezel 30 and the second bezel 32 is T2 (t2 + t3), the ratio of T2 to T1 (T2 / T1) It is preferable that it is 0.2-2.5.

For example, the thickness of the display panel 10 may be 0.4 μm to 1.2 μm, and the thickness of the first bezel 30 and the thickness t2 of the second bezel 32 may be 0.12 μm to 0.5 μm, respectively. have. Specifically, the thickness t2 of the bottom portion 302 of the first bezel 30 may be 0.12 μm to 0.5 μm, and the thickness t2 of the cover portion 324 of the second bezel 32 may be 0.12 μm to 0.5 μm.

If the display panel 10 is too thin, the displacement of the display panel 10 may increase, and thus the display panel 10 may be strong against warpage. However, a heavy object or the like may fall on the display panel 10 and thus may be static in the display panel 10. When a load is applied, its strength is weak and can be easily broken. On the contrary, if the display panel 10 is too thick, the strength to withstand static load may be increased, but the displacement may be weak, and thus may be weak.

Accordingly, as in the present exemplary embodiment, the thickness t1 (t3) of the first bezel 30 and the second bezel 32 may be maintained while the display panel 10 maintains the thickness T1 within the range of 0.4 μm to 1.2 μm. It is preferable to improve mechanical strength (displacement and strength characteristics) of the organic light emitting diode display 100 by adjusting.

In addition, the organic light emitting diode display 100 according to the present exemplary embodiment includes a buffer tape (not shown), for example, a buffer tape called a poron tape in order to cushion an external impact. It may be further disposed between the bottom portion 302 of the).

In addition, the organic light emitting diode display 100 according to the present exemplary embodiment transmits the light emitted from the light emitting layer of the organic light emitting diode and polarizes the light reflected from the metal electrode layer of the organic light emitting diode to improve the contrast of the display panel 10. A tape (not shown) may be further disposed between the display panel 10 and the second bezel 32.

The display device 100 formed as described above is installed in a case constituting a real product (eg, a cellular phone) to display an image desired by a user.

Meanwhile, the organic light emitting diode display 100 according to the exemplary embodiment of the present invention can enhance mechanical strength due to the first bezel 30 and the second bezel 32 as described above. When the overall thickness of the device 100 is the same, a large difference occurs in the mechanical strength of the organic light emitting diode display 100 according to the thicknesses of the display panel 10 and the bezels 30 and 32. This will be described below.

The inventor of the present invention manufactures the organic light emitting display device 100 of the above-described embodiment, and the thickness T1 of the display panel 10, the thickness t2 of the first bezel 30, and the second bezel 32 By varying the thickness t3 and testing the drop characteristic accordingly, an optimal thickness of the display panel 10 and the bezels 30 and 32 suitable for improving the mechanical strength of the organic light emitting diode display 100 may be determined. Derived.

Specifically, after the organic light emitting diode display 100 is manufactured according to the specifications of Table 1 below, each organic light emitting diode display (Experimental Examples 1 to 6) is mounted on a separate drop jig (not shown), and the drop jig is attached. A drop test was performed to determine whether the display panel 10 was damaged by dropping it.

The drop height of the drop jig is 1.8 m, and the drop direction is six arrow directions (first to sixth directions) corresponding to each surface as shown in FIG. The drop jig was dropped three times in each direction to determine whether the display panel was damaged. At this time, in the drop test, the good judgment was calculated as one point, the bad judgment was calculated as 0 points, and the total drop scores of 18 times (6 directions x 3 times) were added up.

In the organic light emitting diode display of Experimental Examples 1 to 6, the average drop score and the good judgment rate after 18 tests are shown in Table 2 below.

Display panel thickness T1 (µm) Thickness t2 of the first bezel (μm) Thickness t3 of the second bezel (μm) Total thickness of bezel T2 (μm) = t2 + t3 Experimental Example 1 1.2 0.1 0.1 0.2 Experimental Example 2 1.0 0.2 0.2 0.4 Experimental Example 3 0.8 0.3 0.3 0.6 Experimental Example 4 0.6 0.4 0.4 0.8 Experimental Example 5 0.4 0.5 0.5 1.0 Experimental Example 6 0.3 0.45 0.45 0.9

T factor [T2 / T1] Average drop score Good judgment rate (%) Experimental Example 1 0.17 5.6 30 Experimental Example 2 0.40 15.4 85 Experimental Example 3 0.75 15.6 87 Experimental Example 4 1.33 15.8 88 Experimental Example 5 2.50 16.0 89 Experimental Example 6 3.00 8.8 49

Referring to Table 1 and Table 2, in Experimental Examples 2 to 5, the average drop score of 15 to 16 and a high good judgment rate of 85 to 89% are shown. In particular, it can be seen that from the Experimental Example 2 to the Experimental Example 4, that is, the larger the T factor value, which is the thickness ratio between the display panel and the bezel, the higher the drop score and the good judgment rate.

On the other hand, in Experimental Example 1 and Experimental Example 6, it can be seen that the average drop scores of 5.6 and 8.8 and low good judgment rate of 30% and 49%.

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.

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>

100; An organic light emitting display device 10; Display panel

30; First bezel 32; Second bezel

Claims (13)

Display panel; A first bezel accommodating the display panel below the display panel; And A second bezel coupled to the first bezel on the display panel to protect the display panel Including, When the thickness of the display panel is T1 and the sum of the thickness of the bottom portion of the first bezel parallel to the light emitting surface of the display panel and the thickness of the cover portion of the second bezel covering the edge of the light emitting surface is T2. And an organic light emitting display device satisfying the following condition. 0.2 ≤ T2 / T1 ≤ 2.5 The method of claim 1, The organic light emitting diode display of which T2 is larger than T1. The method of claim 1, An organic light emitting display device having a thickness of 0.4 μm to 1.2 μm. The method of claim 1, The first bezel includes a first cut portion protruding from an edge of the bottom portion. The method of claim 4, wherein The bottom portion of the organic light emitting display device having a thickness of 0.12㎛ 0.5㎛. The method of claim 1, And a second cut portion protruding from an edge of the cover portion to surround the first cut portion of the first bezel, wherein the cover portion has an opening for opening the light emitting surface. The method of claim 6, The cover of the organic light emitting display device having a thickness of 0.12㎛ 0.5㎛. The method of claim 6, The organic light emitting diode display of which the first cut portion and the second cut portion protrude in opposite directions. The method of claim 1, The organic light emitting diode display of which the strength of the first bezel is greater than the strength of the second bezel. The method of claim 9, And the first bezel comprises a material selected from the group consisting of stainless steel (SUS), cold plate cold commercial (SPCC), aluminum, and nickel-silver alloy. The method of claim 1, And a buffer tape disposed between the display panel and the first bezel. The method of claim 1, And a polarizing tape disposed between the display panel and the second bezel. The method of claim 1, An organic light emitting display device in which the display device is portable.

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