KR20080082398A - Light emitting display - Google Patents

Abstract

A light emitting display device is provided to prevent reduction of brightness of sub pixels by dividedly forming dummy pad units at both sides on a substrate to supply the same signal to the sub pixels inside a display unit. A light emitting display device includes a substrate(110). A display unit(130) has a plurality of sub pixels(120) arranged on the substrate in a matrix shape. Signal lines(140) are formed on the substrate and include a scan line, a data line, a power line, and a ground line connected to the sub pixels respectively. A pad unit(150) is formed at one side of the substrate and has a driving driver to supply driving signals to some of the signal lines. A connection pad unit(155) is formed at one side of the substrate to be electrically connected to the signal lines and the pad unit. Dummy pad units(160) are formed at both outer spaces of the pad unit to be connected to the signal lines connected to the sub pixels.

Description

Light Emitting Display

1 is a schematic plan view of an electroluminescent display device according to an embodiment of the present invention.

2 is a diagram illustrating a subpixel circuit configuration of an electroluminescent display.

3 is an enlarged view of a portion of FIG. 1;

<Explanation of symbols on main parts of the drawings>

110: substrate 120: subpixels

120R, 120G, 120B: red, green and blue subpixels

130: display unit 140: signal wires

150: pad portion 155: connection pad portion

160: dummy pad portion 161: auxiliary pad portion

162: first power pad unit 163: second power pad unit

162R, 162G, 162B: Red, Green and Blue Power Pad Section

The present invention relates to an electroluminescent display device.

The electroluminescent device used in the electroluminescent display device was a self-light emitting device having a light emitting layer formed between two electrodes. Electroluminescent devices could be divided into inorganic electroluminescent devices and organic electroluminescent devices according to the material of the light emitting layer.

In the organic light emitting device, electrons and holes are injected into the light emitting layer from an electron injection electrode and a hole injection electrode, respectively, and an exciton in which the injected electrons and holes combine is excited. The device emits light when it falls from the ground state to the ground state.

The organic light emitting diode is classified into a passive matrix organic emitting diode (PMOELD) and an active matrix organic emitting diode (AMOELD) according to a driving method.

Among them, the active matrix method is suitable for a large screen display or a high resolution display because it has the advantages of low power consumption and low crosstalk between pixels as compared with the passive matrix type.

In general, an active matrix type organic light emitting display device has one or more subpixels formed in an area where N × M scan and data lines cross each other on a substrate, and the subpixel includes one or more thin film transistors, capacitors, and organic light emitting diodes. do.

The thin film transistor includes a source, a drain, and a gate electrode, and the organic light emitting diode is electrically connected to the source or drain electrode terminal of the thin film transistor.

The thin film transistor is classified into a switching thin film transistor and a driving thin film transistor, and a compensation circuit for compensating their characteristics (eg, Vth) may be further provided.

In general driving of the organic light emitting diode, when the switching thin film transistor is turned on by the scan signal supplied through the scan wiring, the data signal supplied through the data wiring is stored in the capacitor in the form of data voltage. The data voltage stored in the capacitor turns on the gate of the driving thin film transistor to emit light of the organic light emitting diode.

On the other hand, such an organic light emitting device has been designed on the edge of the driving device that is located on the substrate for supplying the data signal and the scan signal and aging the organic light emitting device by using this. However, conventional aging pads cannot expect effective aging results due to structural disadvantages in which aging pads cannot be uniformly applied to organic light emitting diodes (eg, reduction or drop in current due to resistance, or IR drop in other words).

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide an electroluminescent display device which can improve display quality by performing uniform aging.

The present invention for solving the above problems, a substrate; A display unit including a plurality of subpixels positioned in a matrix form on a substrate; Signal wires on the substrate and including scan wires, data wires, power wires, and ground wires connected to the subpixels, respectively; A pad unit disposed on one side of the substrate and mounted with a driving driver for supplying driving signals to some of the signal wires; A connection pad part disposed on one side of the substrate and electrically connected to the signal wires and the pad part; And a dummy pad part disposed in both outer spaces of the pad part and connected to signal wires connected to the subpixels, respectively.

The subpixels include red, green and blue subpixels, the subpixels each including one or more transistors, a capacitor and a light emitting diode, wherein the one or more transistors, capacitor and the light emitting diode may be connected to signal wires, respectively.

The dummy pad unit may include: an auxiliary pad supplying a signal for turning on one or more transistors included in the subpixels; a first power pad supplying first power to the subpixels; and a second power supply to the subpixels. It may include a second power pad.

The first power pad may be divided into a red power pad connected to the red, green, and blue subpixels, a green power pad, and a blue power pad.

Each of the first and second power pads may have the same position, size, and height.

In the wiring connected to the first and second power pads, a predetermined region adjacent to the first and second power pads may be formed to be thick.

One or more transistors may be driven in a linear region.

The pad unit may be disposed on the substrate in a rectangular or rectangular shape, and the driving device mounted on the pad unit may receive a driving signal from the outside.

The light emitting diode may be an organic light emitting diode.

<Example 1>

1 is a schematic plan view of an electroluminescent display device according to an embodiment of the present invention.

Referring to FIG. 1, an electroluminescent display device according to an embodiment of the present invention can be described as follows.

There is a display unit 130 including sub-pixels 120 positioned in a matrix form on the substrate 110.

The subpixels 120 positioned in the display unit 130 include red, green, and blue subpixels 120R, 120G, and 120B. The subpixels 120 may emit other colors.

Signal lines 140 including scan wirings, data wirings, power wirings, and ground wirings connected to the subpixels 120 are positioned on the substrate 110.

In addition, a pad unit 150 is disposed on one side of the substrate 110 to which a driving driver electrically connected to some of the signal wires 140 to supply a driving signal is mounted.

In addition, a signal pad 140 and a connection pad part 155 connected to the pad part 150 are positioned on one side of the substrate 110. The connection pad unit 155 is usually electrically connected by a flexible cable (eg, FPC) to receive a driving signal from an external device. The pad part 150 on which the driving driver is mounted is generally positioned on the substrate 110 in a quadrangular or rectangular shape.

The dummy pads 160 are positioned in both outer spaces of the pad unit 150 and connected to the signal wires 140 connected to the subpixels 120, respectively. The external space refers to a space in which the signal wires 140 are routed and remain around both spaces of the pad unit 150.

After manufacturing the electroluminescent display device, the dummy pad unit 160 performs aging on the subpixels 120 connected thereto, and does not connect a separate device to supply a signal for aging. Instead, the pad (substrate) and the pin (aging device) contact method gives an advantage that the aging can be conveniently performed.

Hereinafter, an example of a circuit configuration of the sub pixels will be described with reference to FIG. 2.

2 is a diagram illustrating a subpixel circuit configuration of an electroluminescent display.

As illustrated in FIG. 2, the subpixels include a switching transistor TFT1 having a gate connected to the scan line SCAN and a first electrode connected to the data line DATA in common, and a second electrode of the switching transistor TFT1. A driving transistor TFT2 having a gate connected thereto and a first electrode connected to the first power wiring VDD; a capacitor C connected between the gate of the driving transistor TFT2 and the first power wiring VDD; The light emitting diode D is connected between the second electrode of the TFT2 and the second power line GND.

Here, the light emitting diode D may be an organic light emitting diode D having a light emitting layer formed of an organic material layer, but may also be an inorganic light emitting diode having a light emitting layer formed of an inorganic material layer.

In addition to the description of the structure of the organic light emitting diode (D), the organic light emitting diode (D) is common, such as a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL) and an electron injection layer (EIL) The organic light emitting layer (EML) is interposed between the film. In general, the common film is selectively formed between the first electrode (pixel electrode) and the cathode of the driving transistor TFT2 serving as the anode electrode.

On the other hand, one sub-pixel (Sub-Pixel) includes one organic light emitting diode (D). Each sub pixel emits red (R), green (G), and blue (B), and the sub pixels emitting red, green, and blue may be defined as one pixel.

The transistor described above may be driven in a linear region by the driving signal supplied from the driving driver. That is, the transistors TFT1 and TFT2 serve as digital switching to turn on or off in the linear region.

The sub-pixels 120 and the monitoring pixels 125 described above each include one or more transistors TFT1, TFT2, a capacitor C and a light emitting diode D, although not shown, and each of the one or more transistors. The TFT 1, the TFT 2, the capacitor C, and the light emitting diode D may be connected to the signal wires 140, and the ground wires may be commonly connected and used, but the present invention is not limited thereto.

Although not shown, the electroluminescent display device according to the exemplary embodiment of the present invention may have the same or similar structure as the circuit configuration of the sub-pixels and the monitoring pixels 125 described above.

That is, the circuit configuration or connection relationship between the subpixels 120 and the monitoring pixels 125 may vary depending on the compensation transistor or the structure of the transistors that compensate for each pixel.

Hereinafter, the pad units will be described in more detail with reference to FIG. 3.

3 is an enlarged view of a portion of FIG. 1.

1 and 3, the dummy pad unit 160 may further include an auxiliary pad 161 for supplying a signal for turning on one or more transistors included in the subpixels 120 and the subpixels 120. A first power pad 162 for supplying one power and a second power pad 163 for supplying a second power to the subpixels 120. The first power pad 162 may be a power wiring, and the second power pad 163 may be selected as a ground wiring.

The first power pad 162 is a red power pad 162R, a green power pad 162G, and a blue power pad 162B electrically connected to the red, green, and blue subpixels 120R, 120G, and 120B, respectively. It can be divided into.

Meanwhile, the first and second power supply pads 162 and 163 described above may each be positioned in each of the spaces of the pad unit 150 at the same position, size, and height. Can be.

In addition, the wiring connected to the first and second power pads 162 and 163 may be formed to have a predetermined region adjacent to the first and second power pads 162 and 163.

In addition, the lengths of the wires connected to the first and second power pads 162 and 163 positioned at both sides may be the same. That is, it is as if the clones of the first and second power source pads 162, 163 located on either side are located on the other side.

Such a pad structure is designed in this way in consideration of the advantage of widening the contact area and the resistance problem occurring during signal transmission. However, this purpose is not limited to this.

The structure of the dummy pad unit 160 is dividedly arranged to uniformly supply a signal supplied from a pin contacting the dummy pad unit 160 to both sides of the substrate 110.

Both sides of the pad part 150, that is, the dummy pad part 160 disposed on both sides of the substrate 110, provide a structural advantage so that the same signal can be supplied to the subpixels 120 positioned in the display unit 130. do.

Therefore, as the signal is supplied only in one region, the luminance of the sub-pixels 120 located in the display unit 120 may be reduced in either direction.

In other words, it is possible to solve the problem that the luminance unbalance occurs on the panel due to the decrease or drop of the current caused by the resistance (in other words, IR Drop).

Accordingly, the present invention has the effect of providing an electroluminescent display device capable of improving the display quality by uniformly aging each sub-pixel in the electroluminescent display device.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

As described above, the present invention has the effect of providing an electroluminescent display device capable of improving the display quality by performing uniform aging.

Claims (9)

Board; A display unit including a plurality of subpixels positioned in a matrix form on the substrate; Signal wires on the substrate and including scan wires, data wires, power wires, and ground wires respectively connected to the subpixels; A pad unit disposed on one side of the substrate and mounted with a driving driver for supplying driving signals to some of the signal wires; A connection pad part disposed on one side of the substrate and electrically connected to the signal lines and the pad part; And And a dummy pad part disposed in both outer spaces of the pad part and connected to signal wires connected to the sub-pixels, respectively. The method of claim 1, The subpixels include red, green and blue subpixels, The subpixels, Each comprising one or more transistors, capacitors and light emitting diodes, And at least one transistor, a capacitor, and a light emitting diode are respectively connected to the signal lines, and the ground line is connected in common. The method of claim 2, The dummy pad unit may include: an auxiliary pad supplying a signal for turning on one or more transistors included in the subpixels; a first power pad supplying a first power supply to the subpixels; and a second pad to the subpixels. An electroluminescent display device comprising a second power pad for supplying power. The method of claim 3, The first power pad may include a red power pad connected to the red, green, and blue subpixels, a green power pad, and a blue power pad. The method of claim 3, The first and second power source pads, each pad having the same position, size and height of the electroluminescent display device. The method of claim 3, The wires connected to the first and second power pads have a predetermined area thickened adjacent to the first and second power pads. The method of claim 2, wherein the one or more transistors, Electroluminescent display device driving in linear area. The method of claim 1, wherein the pad unit, And a driving driver mounted on the substrate in a rectangular or rectangular shape and mounted on the pad part to receive a driving signal from an external device connected to the connection pad part. The method of claim 2, The light emitting diode is an organic light emitting diode.

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