KR100659059B1 - Flat panel display device - Google Patents

Abstract

The present invention provides a flat panel display device which minimizes a voltage drop at a pixel electrode to produce desired luminance. In order to achieve the above object, a plurality of pixel electrodes, a plurality of pixel electrode pads corresponding to the pixel electrodes, and each of the pixel electrodes and the pixel electrode pads corresponding thereto are connected to each other. A plurality of connection wiring parts including one connection wiring, wherein the number of connection wirings of each connection wiring portion is proportional to the distance between the pixel electrodes and the pixel electrode pads corresponding thereto. Provide the device.

Description

Flat panel display device

1 is a plan view of a flat panel display device according to an exemplary embodiment of the present invention;

2 is a plan view illustrating the icon display unit of FIG. 1;

3 is a cross-sectional view of II of FIG. 2;

<Brief Description of Major Codes in Drawings>

10: Substrate 11: Icon Display

12: Image display part 13: Icon pad part

14: image pad portion 15: main pad portion

16: connection wiring section 111: first icon

112: second icon 113: third icon

114: fourth icon 131: first icon pad portion

132: second icon pad portion 133: third icon pad portion

134: fourth icon pad portion 161: first connection wiring

162: second connection wiring 163: third connection wiring

164: fourth connection wiring

The present invention relates to a flat panel display, and more particularly, to a flat panel display capable of minimizing a voltage drop in a pixel.

The flat panel display is a display device configured to implement an image on a flat substrate such as a liquid crystal display, an organic electroluminescent device, or an inorganic electroluminescent device.

The flat panel display includes pixel electrodes having a predetermined pattern in the display area, and electrode pads for supplying power to the pixel electrodes outside the edge of the display area. Each of the electrode pads and the pixel electrode are connected by electrode wires.

However, conventionally, one electrode pad corresponds to one pixel electrode, and these are connected by a single wiring.

However, since the light emission efficiency may vary according to the light emission color of each pixel electrode, and the resistance value may vary according to the distance between the pixel electrode and the electrode pads and the area of the pixel electrode, thus the same collectively Designing electrode pads and wiring can be problematic in terms of power consumption and lifetime.

In particular, in the case of an organic light emitting display device, the amount of current consumed to produce a specific luminance may vary significantly depending on the efficiency of the organic light emitting layer, the area of the pixel electrode, and the wiring resistance.

At this time, due to the IC breakdown voltage design upper limit, certain pixels may not achieve the required luminance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a flat panel display device which minimizes a voltage drop at a pixel electrode to produce desired luminance.

In order to achieve the above object, according to the present invention,

A plurality of pixel electrodes;

A plurality of pixel electrode pads corresponding to the pixel electrodes; And

And connecting the pixel electrodes and the pixel electrode pads corresponding thereto with each other, and a plurality of connection wiring units having at least one connection wiring line, respectively.

The number of connection wires of each of the connection wire units may be proportional to the distance between the pixel electrodes and the pixel electrode pads corresponding thereto.

In order to achieve the above object,

A plurality of pixel electrodes;

A plurality of pixel electrode pads corresponding to the pixel electrodes; And

And connecting the pixel electrodes and the pixel electrode pads corresponding thereto with each other, and a plurality of connection wiring units having at least one connection wiring line, respectively.

The number of connection wires of each of the connection wire units is provided in proportion to the area of the pixel electrodes.

According to the present invention,

A plurality of pixel electrodes;

At least one opposing electrode facing the pixel electrodes;

An organic emission layer interposed between the pixel electrodes and the opposite electrode, the organic emission layer including emission layers emitting light of at least two colors different from each other;

A plurality of pixel electrode pads corresponding to the pixel electrodes; And

And connecting the pixel electrodes and the pixel electrode pads corresponding thereto with each other, and a plurality of connection wiring units having at least one connection wiring line, respectively.

The number of connection wires of the connection wire units may be inversely proportional to light emission efficiency of the light emitting layers.

The flat panel display may include an image display unit for displaying a predetermined image and an icon display unit for displaying predetermined icons, and the pixel electrodes may be positioned in the icon display unit.

 Hereinafter, with reference to an embodiment of the present invention shown in the accompanying drawings will be described in detail the present invention.

1 illustrates a flat panel display device according to an exemplary embodiment of the present invention, and illustrates an organic electroluminescent display device implemented on the glass substrate 10.

The icon display part 11 and the image display part 12 are arrange | positioned on the glass substrate 10, and the icon pad part 13 and the image pad part 14 are arrange | positioned at the one side, respectively. The main pad part 15 is disposed at the other end of the substrate 10, and is connected to the icon pad 13 and the image pad part 14. The main pad part 13, the image pad part 14, and the main pad part 15 are mounted with a circuit board on which a plurality of electronic elements such as an IC are mounted.

The configuration of the pad parts 13, 14, 15 may be variously modified.

As shown in FIG. 2, the icon display unit 11 corresponds to an area in which various types of icons are driven in an ON / OFF manner, and the image display unit 12 is driven in a passive matrix or an active matrix manner. It corresponds to the area | region which implements a predetermined image. In a typical display device, an icon is displayed in an image display unit, but according to a preferred embodiment of the present invention, the icon display unit 11 is arranged in a separate fixed area to display an icon in this area.

The icon display unit 11 and the image display unit 12 are provided with organic electroluminescent elements, which are sealed by a separate sealing member (not shown) to block contact with the outside air.

FIG. 2 illustrates the icon display unit 11 and the icon pad unit 13 of the flat panel display as described above in more detail, and FIG. 3 is a cross-sectional view taken along line II of FIG.

The icons arranged on the icon display unit 11 are provided in various shapes. In FIG. 2, only the first icon 111, the second icon 112, the third icon 113, and the fourth icon 114 are provided. It is shown.

The first icon 111, the second icon 112, the third icon 113, and the fourth icon 114 are respectively the first icon pad part 131 and the second icon pad of the icon pad part 13. The unit 132, the third icon pad unit 133, and the fourth icon pad unit 134 are connected to each other. The connection wiring part 16 is disposed between the icons 111, 112, 113, 114, and the icon pad parts 131, 132, 133, and 134, and the first icon 111 and the first icon 111. The first icon pad part 131 is connected by the first connection wiring 161, and the second icon 112 and the second icon pad part 132 are connected by the second connection wiring 162. ) And the third icon pad part 133 are connected by the third connection wire 163, and the fourth icon 114 and the fourth icon pad part 134 are connected by the fourth connection wire 164, respectively. .

The first icon 111 may have an antenna shape in FIG. 2 and is positioned at an edge adjacent to the first icon pad part 131 and emits green light. Each of the lines 111a, 111b, 111c, 111d, 111e, 111f and 111g constituting the antenna shape of the first icon 111 is provided as a pixel electrode, and the first connection wires ( 161 are connected to one of the pixel electrodes that are each of the lines 111a, 111b, 111c, 111d, 111e, 111f, and 111g of the first icon 111, and thus, the first icon pad. The unit 131 also has one pad for each of the lines 111a, 111b, 111c, 111d, 111e, 111f, and 111g of the first icon 111.

The second icon 112 may be shaped like a letter. The second icon 112 is positioned at a substantially center portion of the icon display unit 11 and emits red light. The pixel electrode 112a of the second icon 112 is formed in a rectangular shape having an entire letter shape. As shown in FIG. 3, predetermined openings are formed in the insulating film 17 formed on the pixel electrode 112a. 171, 172, and 173 may form the letter shape as shown in FIG. 2. The second connection wire 162 having two lines is connected to the pixel electrode 112a of the second icon 112. Accordingly, the second icon pad part 132 also has two pads. Each line of the connection line 162 is connected.

The third icon 113 and the fourth icon 114 represent AM and PM of time display, respectively, and emit blue light. The pixel electrodes 113a and 114a of the third icon 113 and the fourth icon 114 are formed in a rectangular shape, and these pixel electrodes are similar to those of the second icon 112 described above. The shape may be defined by an insulating film (not shown) disposed on the (113a) (114a). The third and fourth connection wirings 163 and 164 having two lines are connected to the pixel electrodes 113a and 114a of the third icon 113 and the fourth icon 114, respectively. Accordingly, the third icon pad unit 133 and the fourth icon pad unit 134 also have two pads so as to be connected to each line of the third and fourth connection wirings 163 and 164.

Each of the icons 111, 112, 113, 114 has a cross-sectional structure as shown in FIG. 3. Hereinafter, only the second icon 112 will be described, but all other icons are the same.

First, a buffer layer 10a is formed on the substrate 10.

The substrate 10 may be a transparent glass material, in addition, acrylic, polyimide, polycarbonate, polyester, mylar and other plastic materials may be used.

The buffer layer 10a may be formed to prevent diffusion of impurity ions, and may be formed of SiO 2. If the substrate 10 is a plastic material, the buffer layer 10a may be formed as a barrier layer to prevent penetration of moisture or external air.

The pixel electrode 112a is formed on the buffer layer 10a in a predetermined pattern, and the pixel electrode 112a is connected to the second connection wiring 162.

The second connection wiring 162 may be provided in two layers. The second connection wiring 162 may be formed of the same material as the pixel electrode 112a at a lower portion thereof, and may be further provided with Cr having good conductivity. Of course, the second connection wiring 162 may be formed as a single layer.

An insulating film 17 is formed on the pixel electrode 112a by an organic material such as acrylic, BCB, polyimide, or an inorganic material such as silicon oxide or silicon nitride. Predetermined openings 171, 172, 173 are formed in the insulating film 17 to expose a predetermined portion of the pixel electrode 112a to function as a pixel define layer.

Next, an organic film 112b having a light emitting layer is formed at least over the pixel electrode 112a. In this case, the light emitting layer of the organic layer 112b represents red, which is the color of the second icon 112.

After the organic film 112b is formed, the counter electrode 18, which is the upper electrode of the organic light emitting diode OLED, is formed. The counter electrode 18 may be formed to cover all the icons of the icon display unit 11 in FIG. 2, but is not necessarily limited thereto, and may be patterned.

The pixel electrode 112a and the counter electrode 18 are insulated from each other by the organic layer 112b and the insulating layer 17, and apply voltages having different polarities to the organic layer 112b so that the organic layer 112b is separated from each other. Let the light shine.

On the other hand, the pixel electrode 112a functions as an anode electrode, and the counter electrode 18 functions as a cathode electrode. Of course, the polarities of the pixel electrode 112a and the counter electrode 18 may be reversed.

The pixel electrode 112a may be provided as a transparent electrode or a reflective electrode. The pixel electrode 112a may be provided as ITO, IZO, ZnO, or In 2 O 3 when used as a transparent electrode, and when used as a reflective electrode, Ag, Mg, Al, After forming a reflective film with Pt, Pd, Au, Ni, Nd, Ir, Cr, a compound thereof, or the like, ITO, IZO, ZnO, or In 2 O 3 can be formed thereon.

Meanwhile, the counter electrode 18 may also be provided as a transparent electrode or a reflective electrode. When the counter electrode 18 is used as a transparent electrode, the counter electrode 18 is used as a cathode, so that the work function is small, that is, Li, Ca, or LiF. / Ca, LiF / Al, Al, Mg, and compounds thereof are deposited to face the organic film 112b, and then the auxiliary electrode layer is formed of a material for forming a transparent electrode such as ITO, IZO, ZnO, or In2O3 thereon. Or a bus electrode line can be formed. When used as a reflective electrode, Li, Ca, LiF / Ca, LiF / Al, Al, Mg, and compounds thereof are formed by depositing the entire surface.

The organic layer 112b may be a low molecular or high molecular organic layer. When the low molecular organic layer is used, a hole injection layer (HIL), a hole transport layer (HTL), and an organic emission layer (EML) may be used. ), An electron transport layer (ETL), an electron injection layer (EIL), or the like, may be formed by stacking a single or a complex structure, and the usable organic material may be copper phthalocyanine (CuPc). , N, N-di (naphthalen-1-yl) -N, N'-diphenyl-benzidine (N, N'-Di (naphthalene-1-yl) -N, N'-diphenyl-benzidine: NPB), Various applications are possible, including tris-8-hydroxyquinoline aluminum (Alq3). These low molecular weight organic layers are formed by the vacuum deposition method.

In the case of the polymer organic layer, the structure may include a hole transporting layer (HTL) and a light emitting layer (EML). In this case, PEDOT is used as the hole transporting layer, and polyvinylvinylene (PPV) and polyfluorene are used as the light emitting layer. Polymer organic materials such as (Polyfluorene) are used and can be formed by screen printing or inkjet printing.

In the present invention having such a configuration, as shown in FIG. 2, the number of each connection wiring of the connection wiring unit 16 is proportional to the distance between the corresponding pixel electrode and the pads.

That is, as shown in FIG. 2, in the case of the first icon 111 located close to the icon pad unit 13, the number of wires of the first connection wire 161 is equal to each pixel electrode 111a, 111b, and 111c. (111d) (111e) 111f (111g) per one is provided.

However, the second icon 112, the third icon 113, and the fourth icon 114, which are far from the icon pad unit 13, include the second connection wires 162 and the third wires each having two wires. The pixel electrodes and the icon pads are connected by the connection line 163 and the fourth connection line 164.

When the distance from the pad portion 13 to the pixel electrode is far, the wiring resistance of the connection wiring is high and a large voltage drop occurs. As a result, the amount of current consumed to produce a specific brightness is different. In order to make up for this, the driving voltage needs to be increased, but there is a limit due to the upper limit of the breakdown voltage design of the driving IC.

Therefore, in the present invention, when the distance from the pad unit 13 to the pixel electrode is far, as shown in FIG. 2, the voltage drop according to the wiring resistance is minimized by increasing the number of wirings of the connection wirings.

On the other hand, in addition to the increase in the distance from the pad portion as described above, the voltage drop is also different depending on the area of the pixel electrode.

2, each of the pixel electrodes 111a, 111b, 111c, 111d, 111e, 111f, and 111g of the first icon 111 is formed on a line having a small area. In contrast, the second icon 112 is formed in a rectangular shape having a large area. Therefore, the power consumption of the second icon 112 is greater than that of the first icon 111.

However, according to the present invention, the second connection wire 162 having two connection wires is connected to the pixel electrode 112a of the second icon 112 to minimize the voltage drop.

The second icon 112 is red, and the third and fourth icons 113 and 114 are blue. Such red and blue colors exhibit poor luminous efficiencies of organic matters compared to green, making it difficult to obtain desired luminance and color coordinates.

However, according to the present invention, the second connection wire 162 having two connection wires is connected to the pixel electrode 112a of the second icon 112 and the third and fourth icons 113 and 114 are connected. The third and fourth connection wires 163 and 164 having two connection wires are also connected to the pixel electrodes 113a and 114a to minimize the voltage drop in the wires, thereby reducing the required luminance at a specific voltage. To get it.

The luminous efficiency of red, green, and blue depends on which material is used, and therefore, the luminous efficiency is not limited to the above-described embodiment. When the luminous efficiency of green is lower than that of other colors, the connection wiring is compared with other pixels. Of course, you can connect more.

As described above, according to the present invention, the number of connection wires connected to the pad unit may vary according to the characteristics of each pixel, thereby minimizing a voltage drop in the pixel.

The above description is merely an embodiment of the present invention, and the number of wirings in the present invention may be variously applied.

In addition to the above-described organic electroluminescent display, the present invention can be equally applied to various flat panel display devices having pixel electrodes such as liquid crystal displays and inorganic electroluminescent displays.

According to the present invention, the voltage drop in the pixel can be minimized, and the required luminance can be obtained without increasing the driving voltage.

In addition, it is possible to improve driving characteristics of the flat panel display device and to realize high quality image quality.

In the present specification, the present invention has been described with reference to limited embodiments, but various embodiments are possible within the scope of the present invention. In addition, although not described, equivalent means will also be referred to as incorporated in the present invention. Therefore, the true scope of the present invention will be defined by the claims below.

Claims (4)

A plurality of pixel electrodes; A plurality of pixel electrode pads corresponding to the pixel electrodes; And And connecting the pixel electrodes and the pixel electrode pads corresponding thereto with each other, and a plurality of connection wiring units having at least one connection wiring line, respectively. The number of connection wires of each connection wire portion is proportional to the distance between the pixel electrodes and the pixel electrode pads corresponding thereto. The flat panel display includes an image display unit for displaying a predetermined image, and an icon display unit for displaying predetermined icons, And the pixel electrodes are positioned on the icon display unit. A plurality of pixel electrodes; A plurality of pixel electrode pads corresponding to the pixel electrodes; And And connecting the pixel electrodes and the pixel electrode pads corresponding thereto with each other, and a plurality of connection wiring units having at least one connection wiring line, respectively. The number of connection wires of each connection wire portion is proportional to the area of the pixel electrodes. The flat panel display includes an image display unit for displaying a predetermined image, and an icon display unit for displaying predetermined icons, And the pixel electrodes are positioned on the icon display unit. A plurality of pixel electrodes; At least one opposing electrode facing the pixel electrodes; An organic emission layer interposed between the pixel electrodes and the opposite electrode, the organic emission layer including emission layers emitting light of at least two colors different from each other; A plurality of pixel electrode pads corresponding to the pixel electrodes; And And connecting the pixel electrodes and the pixel electrode pads corresponding thereto with each other, and a plurality of connection wiring units having at least one connection wiring line, respectively. The number of connection wires of each connection wire portion is inversely proportional to the light emission efficiency of the light emitting layers. The flat panel display includes an image display unit for displaying a predetermined image, and an icon display unit for displaying predetermined icons, And the pixel electrodes are positioned on the icon display unit. delete

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