KR100705342B1 - Light emitting display device and method for driving and driving device the same - Google Patents

Abstract

The present invention relates to an electroluminescent display, a driving method thereof, and a driving device.

An electroluminescent display device according to the present invention comprises: a pixel portion having light emitting portions positioned between two polarities; Scan wirings and data wirings respectively connected to two polarities; A first driver electrically connected to the scan wires to input a scan signal; And a second driver electrically connected to the data wires to input a level of the data signal to have a deviation based on the left side or the right side.

EL display device, driving method, driving device

Description

Light Emitting Display Device and Method for Driving and Driving Device the same}

1 is a view showing a conventional electroluminescent display device.

2 is a schematic circuit diagram of a conventional electroluminescent display.

3 is a diagram illustrating an electroluminescent display device according to an exemplary embodiment of the present invention.

4 is a view showing a driving device.

5 is a schematic circuit diagram of the present invention.

The present invention relates to an electroluminescent display, a driving method thereof, and a driving 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 addition, the electroluminescent device has a top emission type and a bottom emission type according to the direction in which light is emitted, and a passive matrix type and an active matrix type depending on the driving method. Matrix).

Hereinafter, a conventional electroluminescent display device will be described with reference to the drawings.

1 is a diagram illustrating a conventional electroluminescent display, and FIG. 2 is a schematic circuit diagram of a conventional electroluminescent display.

Referring to FIG. 1, the electroluminescent display device 100 includes a driver D for applying a scan signal and a data signal to the pixel portion P formed on the substrate 110.

The pixel portion P has an anode electrode (not shown) formed in a band shape on the substrate 110, and an insulating film in which predetermined regions of the anode electrodes (not shown) are exposed on the anode electrodes (not shown). Not shown) is formed. Light emitting parts 150 of the organic layer are formed in the exposed area, and the partition wall 140 is formed to distinguish the light emitting parts 150. The cathode electrodes 160 are separated from the partition wall 140 and are formed in a band shape on the light emitting units 150 by crossing the anode electrodes (not shown).

Data wires 121 with a plurality of wires are formed on the anode electrodes (not shown), and scan wires 125a and 125b with a plurality of wires are formed on the cathode electrodes 160. The scan wires 125a and 125b are alternately wired in an odd / even form on the left or right side of the substrate 110.

The driving unit D for inputting a data signal and a scan signal is connected to the data lines 121 and the scan lines 125a and 125b, respectively. Usually, the data lines 121 and the scan lines 125a and 125b of the pixel portion P may be connected to the data lines 122 of the film type driver D using an anisotropic conductive film (ACF) or the like. Scan wires 126a and 126b are electrically connected.

Referring to FIG. 2 together, the electroluminescent display device 100 of FIG. 1 is constructed in a circuit to describe the problems of the prior art.

As described above, scan signals are alternately input to the left or the right of the scan wires alternately and evenly wired in odd / even shapes. For convenience of explanation, only the left scan line S1 and the right scan line S2 will be described.

If a data signal is input to all data lines and a scan signal is input to the left scan line S1, the node is as follows.

The data signal input to the data line is formed on the left scan line S1 through the anode electrode and the cathode electrode of the light emitting unit. Assuming that the same resistance, for example, 2Ω, is formed in each light emitting portion, they form a series resistance in the left scan line S1.

Looking at this from one end opposite to the left scan line (S1), it can be seen that the resistance value increases from one end to the end. In addition, it can be seen that each of the light emitting parts has the same resistance difference. These eventually mean that there is a resistance variation in the scan lines of the entire panel.

As a result of the above problem, each of the light emitting units may form a voltage or a current difference on the scan line even when the same data signal is input, and thus cannot display uniform luminance.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide an electroluminescent display device in which a luminance difference is compensated for.

In order to solve the above problems, an electroluminescent display device according to the present invention comprises: a pixel portion having light emitting portions positioned between two polarities; Scan wirings and data wirings respectively connected to two polarities; A first driver electrically connected to the scan wires to input a scan signal; And a second driver electrically connected to the data wires to input a level of the data signal to have a deviation based on the left side or the right side.

Here, the first and second driving units may be one driving unit.

Here, the second driver may generate a data signal in which the output voltage or current level gradually decreases toward one of the data wires, and input the data signal to the data wires.

Here, the scan wires may be alternately wired in an odd / even form on the left or right side of the substrate.

Here, the second driver is connected to the power supply voltage unit, a signal conversion unit for converting and outputting a signal received from the outside, at least one switch unit one end is connected to the power supply voltage unit, selectively on or off, the other end of the switch unit The output terminal and the gate of the signal conversion unit is connected to include at least one transistor portion for outputting the voltage or current of the power supply voltage portion by the selective on or off of the switch portion.

Here, the transistor section includes one or more resistor sections located between each source or drain of the transistor section.

Here, the resistor unit may have the same value.

Here, when any one of the two or more switch units is turned on, the second driver unit may output an output voltage of the transistor unit toward one direction by a resistance unit formed between a signal output from the signal converter and each source or drain of the transistor unit. It may be to lower the current.

Here, the light emitting units may be formed of an organic layer.

Meanwhile, a method of driving an electroluminescent display device according to the present invention includes a scan signal input step of inputting a scan signal to scan wires connected to any one of two polarities of a pixel portion having light emitting portions positioned between two polarities; And a data signal input step of inputting a data signal in which the level of the data signal is lowered in either direction to the data wires connected to the other one of the two polarities.

Here, the scan wires may be alternately wired in an odd / even form on the left or right side of the substrate.

Here, in the data signal input step, when the scan signal is input to the left side of the scan line, input the data signal that is lowered toward the left side of the data lines, and when the scan signal is input to the right side of the scan line, The data signal may be inputted as the data signal decreases toward the right side of the data wires.

Here, the light emitting units may be formed of an organic layer.

On the other hand, the driving device of the electroluminescent display device according to the present invention, the power supply voltage unit, a signal conversion unit for converting and outputting a signal received from the outside, one or more connected to the power supply voltage unit two or more selectively on or off And at least one transistor unit connected to the other end of the switch unit and connected to an output terminal of the signal conversion unit and a gate to output a voltage or current of the power supply voltage unit by selective on or off of the switch unit.

Here, the transistor unit includes a resistor unit having at least one same value between each source or drain of the transistor unit.

Here, when any one of the two or more switch units is turned on, the driving device outputs a voltage or a current of the transistor unit toward one direction by a resistance unit formed between a signal output from the signal converter and each source or drain of the transistor unit. It may be to lower the.

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

<Example 1>

3 is a view showing an electroluminescent display device according to an embodiment of the present invention, FIG. 4 is a view showing a driving device, and FIG. 5 is a schematic circuit diagram of the present invention.

Referring to FIG. 3, in the electroluminescent display device 300, a pixel portion P having light emitting portions 350 positioned between two polarities is formed.

In the pixel portion P, first electrodes (not shown) having one of two polarities are formed in a band shape on the substrate 310, and first electrodes (not shown) are formed on the first electrodes (not shown). An insulating film (not shown) in which a predetermined region of is exposed is formed. In the exposed region, the light emitting parts 350 of the organic layer are formed, and the partition wall 340 is formed to distinguish the light emitting parts 350. The second electrodes 360, which are separated from the barrier rib 340, which are one of two polarities, cross the first electrodes (not shown) on the light emitting parts 350 and are formed in a band shape.

A plurality of wires are connected to the first electrodes (not shown) to form data wires 321, and a plurality of wires are connected to the second electrode 360 to form scan wires 325a and 325b. . The scan wires 325a and 325b are alternately wired in an odd / even form with respect to the left side or the right side of the substrate 310.

The driving unit D for inputting a data signal and a scan signal is connected to the data wires 321 and the scan wires 325a and 325b, respectively. Here, the driving unit D for inputting the data signal and the scan signal is formed in one drawing. However, the first driver may be divided into a second driver, and the first driver may be a scan driver for inputting a scan signal, and the second driver may be a data driver for inputting a data signal. As such, the driving unit D may be divided into a first driving unit and a second driving unit, respectively, and when the panel is large, a plurality of driving units D may be formed.

Normally, the data lines 321 and the scan lines 325a and 325b of the pixel portion P are connected to the data lines 322 of the film type driver D using an anisotropic conductive film (ACF) or the like. Scan wires 326a and 326b are electrically connected.

The driver D inputs a scan signal to the scan wires 325a and 325b, and makes the level of the data signal input to the data wires 321 have a deviation based on the left side or the right side. To have a deviation means to generate a data signal in which the output voltage or current level gradually decreases toward one of the data lines 321 and input the data signal to the data lines 321.

A driving unit which is a driving device for applying a scan or data signal to the electroluminescent device will be described with reference to FIG. 4. The driving unit D includes a power supply voltage unit (power supply voltage unit) to which power is input and a signal conversion unit (signal conversion unit) for converting and outputting a signal input from the outside. The signal converter (signal converter) is a digital to analog converter (DAC) for converting a digital signal into an analog signal. One or more switch units SW1 and SW2 having one end connected to the power supply voltage unit (power supply voltage unit) are selectively formed. A source or a drain is connected to the other end of the switch unit SW1 and SW2, and an output terminal and a gate of the signal conversion unit (signal conversion unit) are connected to the power supply voltage unit by selective on or off of the switch unit SW1 and SW2. One or more transistor sections T1..Tn + 1 for outputting the voltage or current of the (power supply voltage section). In the transistor section T1..Tn + 1, a resistor section R having one or more equal values is positioned between each source or drain of the transistor section T1..Tn + 1 to form a series structure.

When one of the two or more switch units SW1 and SW2 is turned on, the driving unit D is a signal output from the signal converter (signal converter) and each source of the transistor unit T1..Tn + 1 or The output voltage or current of the transistor portion T1 .. Tn + 1 is lowered toward the one direction by the resistor portion R formed between the drains.

The driving unit D having such a structure generates a data signal in which the output voltage or current level gradually decreases in one direction and inputs the data signal to the data lines.

However, when the scan signal input to the scan lines 325a and 325b is input to the left side of the scan line, the data signal is lowered toward the left side of the data lines 321 and the scan signal is input. When is input to the right side of the scan line, the data signal that is lowered toward the right side of the data lines 321 should be input. (See FIG. 3).

In detail, scan signals are alternately input to the left or right of scan wires alternately wired in an odd / even form. One end of the scan line to which the scan signal is input forms a low resistance, but gradually increases toward the end of the scan line. In such a resistance difference, even if the level of the input data signal is the same, the luminance from one end to the end varies depending on the resistance of the scan line toward either side.

Therefore, a current or voltage having a high level of data signal is input to the end of the scan line, and a current or voltage of a relatively low level is input to one end thereof.

This is a characteristic of the driving unit D of the present invention, and it is possible to compensate for the luminance difference due to the resistance difference by inputting a data signal whose output voltage or current level gradually decreases in one direction.

Hereinafter, a driving method of the electroluminescent display device according to the present invention will be described with reference to FIG. 5.

5 shows a schematic circuit diagram of an electroluminescent display device according to the present invention, which is a schematic circuit diagram for easily explaining the driving method of the present invention.

The driving method of the electroluminescent display device according to the present invention is as follows.

First, the scan signal input step scans the scan wirings SW3 and SW4 connected to any one of two polarities of the pixel portion P having the light emitting portions D1..Dn + 2 positioned between the two polarities. Inputting a signal. The scan wires SW3 and SW4 are alternately wired in an odd / even form on the left or right side of the substrate. Here, two scan wires SW3 and SW4 shown for convenience of description are expressed as a kind of switch, but are not limited thereto.

Subsequently, the data signal input step is a step of inputting a data signal in which the level of the data signal decreases in either direction to data wires connected to the other one of the two polarities. In the data signal input step, when the scan signal is input to the left side of the scan line, a data signal that is lowered toward the left side of the data wires is input. When the scan signal is input to the right side of the scan line, the data signal is input. Inputs a data signal lowered toward the right side of the data lines.

If a scan signal is input to the scan wiring SW4 located on the left side, the switch unit SW1 formed in the driving unit D is turned on, and the switch unit SW2 is turned off. When the switch unit SW1 is turned on, an output voltage or voltage is generated by the resistor unit R formed between the signal output from the signal conversion unit (signal conversion unit) and each source or drain of the transistor unit T1..Tn + 2. The current becomes

T1 source voltage < Tn + 2 source voltage and I1 current < In + 2 to compensate for the luminance difference between the light emitting unit D1 and the light emitting unit Dn + 2.

If the scan signal is input to the scan wiring SW3 located on the right side, the switch unit SW2 formed in the driving unit D is turned on, and the switch unit SW1 is turned off. When the switch unit SW2 is turned on, an output voltage or voltage is generated by a resistor R formed between the signal output from the signal conversion unit (signal conversion unit) and each source or drain of the transistor unit T1..Tn + 2. The current becomes

T1 source voltage> Tn + 2 source voltage, I1 current> In + 2, so that the luminance difference between the light emitting unit D1 and the light emitting unit Dn + 2 can be compensated.

That is, one of the switch units SW1 and SW2 in the driving unit D is turned on and the other is turned off, so that the transistor unit is gradually moved in one direction by using the current or the voltage drop caused by the resistor unit R. It is possible to lower the output voltage or current of (T1..Tn + 2).

In this way, data signals having a lowered output voltage or current level are alternately inputted as described above. Here, the highest level data signal is input to the scan line that forms the highest resistance in circuit, and the lowest level data signal is input and compensated in the scan line forming the lowest resistance.

To explain this in terms of data signals and scan lines, the first input data signal is called data [1], the last input data signal is called data [n], and one end of one scan line is called scan_1. Assume that the other end is scan_n.

Here, if the resistance gradually increases as scan_1 <scan_n due to the resistance difference from scan lines scan_1 to scan_n, the level of the signal input from data [1] to data [n] is set to data [1]> data [n]. Enter it together.

As a result, data [1]> data [n] is obtained in terms of the data signal, but scan_1 = scan_n in terms of the scan line, thereby solving the problem of the luminance difference caused by the resistance difference between the scan lines.

That is , the present invention can compensate the problem that the luminance difference occurs in the conventional scan line in the driver.

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.

According to the configuration of the present invention described above, there is an effect that can solve the problem that the luminance difference occurs when outputting an image to the panel of the electroluminescent display.

Claims (16)

A pixel portion having light emitting portions positioned between two polarities; Scan wirings and data wirings respectively connected to the two polarities; A first driver electrically connected to the scan wires to input a scan signal; And And a second driver electrically connected to the data wires to input a level of the data signal to have a deviation based on a left side or a right side. The method of claim 1, wherein the first and second driving unit, An electroluminescent display device, characterized in that one drive. The method of claim 1, wherein the second driving unit, And generating and inputting a data signal in which the output voltage or current level gradually decreases in one direction and inputs the data signal to the data lines. The method of claim 1, wherein the scan wires, Electroluminescent display device characterized in that the wiring in the odd / even form alternately on the left or right side on the substrate. The method of claim 1, wherein the second driving unit, Power supply voltage unit; A signal converter for converting and outputting a signal received from the outside; Two or more switch parts, one end of which is connected to the power supply voltage part and selectively turned on or off; And And at least one transistor unit connected to the other end of the switch unit and connected to an output terminal of the signal conversion unit and a gate to output a voltage or current of the power supply voltage unit by selective on or off of the switch unit. The method of claim 5, wherein the transistor unit, And at least one resistor unit is positioned between each source or drain of the transistor unit. The method of claim 6, wherein the resistor unit, Electroluminescent display device, characterized in that the same value. The method of claim 7, wherein the second driving unit, When any one of the two or more switch unit is on, An electroluminescent display device characterized in that an output voltage or current of the transistor unit gradually decreases toward one direction by a signal output from the signal converter and the resistor unit formed between each source or drain of the transistor unit . The method of claim 1, wherein the light emitting portion, Electroluminescent display device characterized in that formed of an organic layer. A scan signal input step of inputting a scan signal to scan wires connected to any one of the two polarities of the pixel portion having light emitting portions positioned between two polarities; And a data signal input step of inputting a data signal whose level of the data signal is lowered in either direction to data wires connected to the other one of the two polarities. The method of claim 10, wherein the scan wires, And an odd / even numbered alternately wired on the left or right side of the substrate. The method of claim 11, wherein in the data signal input step, When the scan signal is input to the left side of the scan line, input the data signal that is lowered toward the left side of the data lines, And when the scan signal is input to the right side of the scan line, input the data signal that is lowered toward the right side of the data lines. The method of claim 10, wherein the light emitting portion, A method of driving an electroluminescent display device, characterized in that formed of an organic layer. Power supply voltage unit; A signal converter for converting and outputting a signal received from the outside; Two or more switch parts, one end of which is connected to the power supply voltage part and selectively turned on or off; And And at least one transistor unit connected to the other end of the switch unit and connected to an output terminal of the signal converting unit and a gate to output a voltage or current of the power supply voltage unit by selective on or off of the switch unit. . The method of claim 14, wherein the transistor unit, And a resistor unit having at least one same value between each source or drain of the transistor unit. The method of claim 14, wherein the drive device, When any one of the two or more switch unit is on, And an output voltage or a current of the transistor unit lowered in either direction by the resistor unit formed between the signal output from the signal converter and each source or drain of the transistor unit.

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