KR101040808B1 - Organic light emitting display device and driving method thereof - Google Patents

Abstract

An organic light emitting display device according to an embodiment of the present invention includes a pixel unit including red, green, and blue pixels, and configured to emit light from the red, green, and blue pixels in response to a data signal and a scan signal; The red, green, and blue image signals, which are located above or below the pixel portion, and are output from a plurality of output channels, are applied to data lines connected to each pixel as corresponding data signals. A data driver for repeatedly outputting a red data signal, a green data signal, and a blue data signal according to the number order of the plurality of output channels; A scan driver which outputs the scan signal; A gamma correction unit for determining a voltage of the red data signal corresponding to the red image signal, a voltage of the green data signal corresponding to the green image signal, and a voltage of the blue data signal corresponding to the blue image signal; And a plurality of transistors disposed between the plurality of output channels and a plurality of data lines corresponding thereto, and controlled by a gamma conversion signal, so that the red data signal is transmitted to the red pixel regardless of the position of the data driver. And a gamma converter configured to transmit the green data signal to the green pixel and to transmit the blue data signal to the blue pixel, wherein the plurality of output channels and the corresponding data lines are the same number. Is implemented.

Description

Organic light emitting display device and driving method thereof {ORGANIC LIGHT EMITTING DISPLAY AND DRIVING METHOD FOR THE SAME}

The present invention relates to an organic light emitting display device and a driving method thereof. More particularly, the present invention relates to an organic light emitting display device and a driving method thereof for performing gamma correction for each color of red, green, and blue.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. The flat panel display includes a liquid crystal display, a field emission display, a plasma display panel, and an organic light emitting display.

Among the flat panel display devices, the organic light emitting display device has been greatly expanded to include PDAs and MP3 players in addition to mobile phones due to various advantages such as excellent color reproducibility and thin thickness.

The organic light emitting display device displays an image by using an organic light emitting diode (OLED) in which the brightness of light is determined according to the amount of input current.

The organic light emitting diode has a red, green, or blue light emitting layer disposed between the anode electrode and the cathode electrode, and the luminance is determined according to the amount of current flowing between the anode electrode and the cathode electrode.

In this case, the red, green, and blue light emitting layers have a difference in luminous efficiency. Therefore, different gamma is applied to the red, green, and blue pixels.

In this case, when the separate gamma is applied, red, green from left to right of the data driver. When blue data is output and from right to left in the data driver, red and green. When blue data is output, the same gamma is applied to green, but different gamma is applied to red and blue, which causes a problem that luminance is changed.

The present invention provides an organic light emitting display device and a method of driving the same, which allow gamma to be applied to a color regardless of the order of data output from the data driver even when independent gamma is used for each color.

In order to achieve the above object, a first aspect of the present invention includes a pixel unit including red, green, and blue pixels, and configured to emit light from the red, green, and blue pixels in response to a data signal and a scan signal; The red, green, and blue image signals, which are located above or below the pixel portion, and are output from a plurality of output channels, are applied to data lines connected to each pixel as corresponding data signals. A data driver for repeatedly outputting a red data signal, a green data signal, and a blue data signal according to the number order of the plurality of output channels; A scan driver which outputs the scan signal; A gamma correction unit for determining a voltage of the red data signal corresponding to the red image signal, a voltage of the green data signal corresponding to the green image signal, and a voltage of the blue data signal corresponding to the blue image signal; And a plurality of transistors disposed between the plurality of output channels and a plurality of data lines corresponding thereto, and controlled by a gamma conversion signal, so that the red data signal is transmitted to the red pixel regardless of the position of the data driver. And a gamma converter configured to transmit the green data signal to the green pixel and to transmit the blue data signal to the blue pixel, wherein the plurality of output channels and the corresponding data lines are the same number. It is to provide an organic light emitting display device, characterized in that implemented.

In order to achieve the above object, a second aspect of the present invention provides a method for generating red, green, and blue data signals using red, green, and blue video signals; Outputting the red, green, and blue data signals to which red gamma, green gamma, and blue gamma are respectively applied in order of number of output channels of a data driver; The red, green, and blue data signals output from the respective output channels are applied to a plurality of data lines corresponding to the plurality of output channels, and the red data signal is applied to the red pixel regardless of the position of the data driver. And transmitting the green data signal to the green pixel, and transmitting the blue data signal to the blue pixel, wherein the plurality of output channels and the corresponding data lines are implemented in the same number. The present invention provides a method of driving an organic light emitting display device.

According to the organic light emitting display device and the driving method thereof according to the present invention, even if independent gamma is used for each color, the red gamma is applied to the red pixel regardless of the order of data output from the data driver, and the green is applied to the green pixel. Gamma may be applied and blue gamma may be applied to the blue pixel.

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

1 is a structural diagram showing the structure of an organic light emitting display device according to the present invention. Referring to FIG. 1, the organic light emitting display device includes a pixel unit 100, a data driver 200, a scan driver 300, a gamma correction unit 400, and a gamma converter 500.

A plurality of pixels 101 are arranged in the pixel unit 100, and each pixel 101 includes an organic light emitting diode (not shown) that emits light in response to the flow of current. The pixel unit 100 is formed in the row direction and has n scan lines S1, S2,..., Sn-1, Sn transferring the scan signals and m data lines formed in the column direction and transferring data signals. (D1, D2, ... Dm-1, Dm) are arranged.

In addition, the pixel unit 100 receives and drives the first power source and the second power source. Therefore, the pixel unit 100 emits light by displaying a current by flowing current through the organic light emitting diode by the scan signal, the data signal, the emission control signal, the first power source, and the second power source. In addition, the plurality of pixels 101 may include red, green, and blue subpixels.

The data driver 200 is a means for generating a data signal. The data driver 200 generates a data signal using image signals R, G, and B data having red, blue, and green components. In addition, the data driver 200 may output a data signal generated by connecting an output channel for outputting a data signal to the data lines D1, D2,... Dm-1, Dm of the pixel unit 100. 100). The output channel for outputting the data signal from the data driver is 1, 4, 7, 10. The output channel is applied with red gamma, and the second, 5, 8, 11. output channel is applied with green gamma. 6, 9, 12. The output channel is blue gamma.

The scan driver 300 is a means for generating a scan signal. The scan driver 300 is connected to the scan lines S1, S2,..., Sn-1, Sn to transfer the scan signal to a specific row of the pixel unit 100. The data signal output from the data driver 200 is transmitted to the pixel 101 to which the scan signal is transmitted, and a voltage corresponding to the data signal is transmitted to the pixel.

The gamma correction unit 400 adjusts the ratio of the gray level to the voltage of the data signal. In addition, red, green, and blue each use a separate gamma due to the luminous efficiency due to the difference in the red, green, or blue light emitting layer. For example, in the case of expressing 0 to 63 grayscales, the voltage Vdata of the data signal corresponding to 30 grayscales is 3.0V for red, 3.1V for green, and 3.2 for blue due to the efficiency of red, green, or blue. Let V be.

The gamma converter 500 may apply red gamma to the red data signal transmitted to the red pixel, apply green gamma to the green data signal transmitted to the green pixel, and apply blue gamma to the blue data signal transmitted to the blue pixel. do. That is, regardless of the output channel for outputting the data signal from the data driver 200, a red gamma applied data signal is transmitted to the red pixel of the pixel unit, a green gamma applied data signal is transmitted to the green pixel, and blue gamma is transmitted to the blue pixel. The applied data signal is transmitted. The gamma converter 500 operates according to the gamma conversion signal gs.

Here, although the data driver 200 and the gamma converter 500 are shown to be positioned under the pixel unit 100, the data driver 200 and the gamma converter 500 may be arranged by the designer. It may be located at the top of). The gamma converter 500 transmits a red data signal to which red gamma is applied to the red pixel, a green data signal to which green gamma is applied to the green pixel, and blue data to which blue gamma is applied to the blue pixel. Allow signal to be delivered.

FIG. 2 is a structural diagram illustrating an arrangement of pixels of a pixel part of the organic light emitting display device illustrated in FIG. 1. Referring to Figure 2,

In the pixel unit 100, one pixel 101 includes three subpixels, and the three subpixels include red, green, and blue subpixels 101R, 101G, and 101B. Each of the sub pixels 101R, 101G, and 101B is connected to a data line to receive a data signal.

In addition, each pixel 101 includes red, green, and blue subpixels 101R, 101G, and 101B from left to right.

The data driver 200 is connected to the pixel unit 100 so that the output channel of the data driver 200 outputs red, green, and blue data signals in the order of first, second, third, and the like. There is a second case in which the output channel of the data driver 200 outputs blue, green, and red data signals in the order of first, second, third, and the like. One of the above two cases is selected depending on whether the data driver 200 is positioned above or below the pixel unit 100.

In the first case, a red gamma is applied to the first output channel, and the transmitted data signal is a red data signal, and pixels representing red are connected. Green gamma is applied to the second output channel, and the transmitted data signal is a green data signal, and a pixel representing green is connected. Blue gamma is applied to the third output channel, and the transmitted data signal is a blue data signal, and a pixel representing blue is connected.

In the second case, a red gamma is applied to the first output channel, and the transmitted data signal is a blue data signal, and pixels representing blue are connected. Green gamma is applied to the second output channel, and the transmitted data signal is a green data signal, and a pixel representing green is connected. Blue gamma is applied to the third output channel, and the transmitted data signal is a red data signal, and a pixel representing red is connected.

Therefore, in the first case, a gamma of red, green, and blue is applied to pixels representing red, green, and blue to express luminance suitable for each color. On the other hand, in the second case, gamma of blue, green, and red is applied to the pixels representing red, green, and blue, so that luminance suitable for each color is not expressed.

In order to solve the above problems, the gamma converter 500 is connected between the data driver 200 and the pixel unit 100 to transmit a red gamma-applied data signal to a pixel representing red and to represent green. The data signal to which the green gamma is applied is transmitted to the pixel, and the data signal to which the blue gamma is applied is transmitted to the pixel representing blue.

3 is a circuit diagram illustrating a gamma correction unit employed in an organic light emitting display device according to the present invention. Referring to FIG. 3, three gamma correction units 400 are configured to be applied to red, green, and blue data signals.

Each gamma correction unit 500 includes a register unit 60, a ladder resistor 61, an amplitude adjustment register 62, a curve adjustment register 63, first selectors 64 to sixth selector 69, and a gray level. It operates by including the voltage amplifier 70.

If the gamma correction unit 400 is a red gamma correction unit, the register setting value suitable for red is stored. If the gamma correction unit 400 is green gamma correction unit, the register setting value suitable for green is stored. If the correction unit 400 is a blue gamma correction unit, a register setting value suitable for blue is stored. That is, the register unit 60 stores a register setting value suitable for the red pixel when the gamma correction unit 400 is connected to the red pixel to perform gamma correction, and the green pixel when the gamma correction unit 400 is connected to the green pixel for gamma correction. Save the appropriate register settings. When the gamma correction is performed by being connected to the blue pixel, a register setting value suitable for the blue pixel is stored.

The upper 10 bits of the register values stored in the register section 60 are input to the amplitude adjustment register 62, and the lower 16 bits are input to the curve adjustment register 63, respectively, and are selected as register setting values.

The ladder resistor 61 has a configuration in which a plurality of variable resistors included between the highest level voltage VHI and the lowest level voltage VLO are connected in series, and generates a plurality of gray voltages through the ladder resistor 61. .

The amplitude adjustment register 62 outputs a 3-bit register setting value to the first selector 64 and a 7-bit register setting value to the second selector 65. At this time, the number of selectable gray scales can be increased by increasing the number of setting bits, and the gray scale voltage can be selected differently by changing the register setting value.

The curve adjustment register 63 outputs a 4-bit register setting value to each of the third selector 66 to the sixth selector 69. In this case, the register setting value may be changed, and the gray level voltage selectable according to the register setting value may be adjusted.

The upper 10 bits of the register signal are input to the amplitude adjustment register 62, and the lower 16 bits of the register signal are input to the curve adjustment register 63.

The first selector 64 selects a gray voltage corresponding to a 3-bit register setting value set in the amplitude adjusting register 62 among the plurality of gray voltages distributed through the ladder resistor 61 and outputs the gray voltage corresponding to the highest gray voltage. .

The second selector 65 selects a gray voltage corresponding to a 7-bit register setting value set in the amplitude adjusting register 62 among the plurality of gray voltages distributed through the ladder resistor 61 and outputs the gray voltage corresponding to the lowest gray voltage.

The third selector 66 divides the voltage between the gray voltage output from the first selector 64 and the gray voltage output from the second selector 65 into a plurality of gray voltages through a plurality of resistor columns, and The gradation voltage corresponding to the register setting value is selected and output.

The fourth selector 67 divides the voltage between the gray voltage output from the first selector 64 and the gray voltage output from the third selector 66 through a plurality of resistor columns and corresponds to a 4-bit register setting value. Select the gradation voltage to be output.

The fifth selector 68 selects and outputs a gray scale voltage corresponding to a 4-bit register setting value among the gray voltages between the first selector 64 and the fourth selector 67.

The sixth selector 69 selects and outputs a gray scale voltage corresponding to a 4-bit register setting value among the plurality of gray voltages between the first selector 64 and the fifth selector 68. By the above operation, the curve adjustment of the intermediate gray scale portion is made possible according to the register setting value of the curve adjustment register 63, so that the gamma characteristic can be easily adjusted according to the characteristics of each light emitting element. Also, to make the gamma curve characteristic convex downward, the potential difference between each gray scale becomes larger as the small gray scale is displayed. On the other hand, to make the gamma curve characteristic convex upward, the potential difference between each gray scale becomes smaller as the small gray scale is displayed. What is necessary is just to set the resistance value of each ladder resistor 61.

The gray voltage amplifier 70 outputs a plurality of gray voltages corresponding to each of the plurality of gray levels to be displayed on the pixel unit 100. 2 shows the output of the gray scale voltage corresponding to 64 gray scales.

FIG. 4 is a circuit diagram illustrating a first embodiment of a gamma conversion unit employed in an organic light emitting display device according to the present invention. FIG. Referring to FIG. 4, the gamma converter 500 includes a first transistor M1, a second transistor M2, a third transistor M3, and a fourth transistor M4. The first transistor M1 and the fourth transistor M4 are implemented as P MOS transistors, and the second transistor M2 and third transistor M3 are implemented as N MOS transistors, but the first transistor M1 When the fourth transistor M4 is implemented as an N MOS transistor, the second transistor M2 and the third transistor M3 may be implemented as a P MOS transistor.

The source of the first transistor M1 is connected to the first channel of the data driver 200 and the drain is connected to the first data line D1. The gate is connected to the gamma conversion signal line GS.

The source of the second transistor M2 is connected to the first channel of the data driver 200 and the drain thereof is connected to the third data line D3. The gate is connected to the gamma conversion signal line GS.

The source of the third transistor M3 is connected to the third channel CH3 of the data driver 200 and the drain thereof is connected to the first data line D1. The gate is connected to the gamma conversion signal line GS.

The source of the fourth transistor M4 is connected to the third channel CH3 of the data driver 200 and the drain thereof is connected to the third data line D3. The gate is connected to the gamma conversion signal line GS.

In addition, the second channel CH2 of the data driver 200 is directly connected to the second data line D2.

When the low state signal is transmitted through the gamma conversion signal line GS, the first transistor M1 and the fourth transistor M4 are turned on, and the second transistor M2 and the third transistor M3 are turned off. It becomes a state. That is, the first channel CH1 of the data driver 200 is connected to the first data line D1, the second channel CH2 is connected to the second data line D2, and the third channel CH3 is connected to the first channel CH1. 3 is connected to the data line D3.

In addition, when a signal having a high gamma conversion signal is transmitted through the gamma conversion signal line GS, the first transistor M1 and the fourth transistor M4 are turned off, and the second transistor M2 and the third transistor are turned off. M3 is turned on. That is, the first channel CH1 of the data driver 200 is connected to the third data line D3, the second channel CH2 is connected to the second data line D2, and the third channel CH3 is connected to the first channel CH3. 1 is connected to the data line D1.

Therefore, when the gamma conversion signal transmitted through the gamma conversion signal line GS is in a low state, red data is transmitted to the first data line D1, green data is transmitted to the second data line D2, and a third data line ( Blue data is delivered to D3). When the gamma conversion signal transmitted through the gamma conversion signal line GS is in a high state, blue data is transmitted to the first data line D1, green data is transmitted to the second data line D2, and a third data line ( Red data is delivered to D3).

Due to the above operation, a data signal with red gamma is transmitted to the red subpixel 101R of the pixel unit 100 and a data signal with green gamma is transmitted to the green subpixel 101G, and the blue subpixel 101B is transmitted. ), A data signal to which blue gamma is applied is transmitted.
However, as shown in the drawing, a plurality of output channels connected to the gamma converter 500 and a plurality of data lines corresponding thereto must be implemented in the same number.

FIG. 5 is a circuit diagram illustrating a second embodiment of a gamma conversion unit employed in an organic light emitting display device according to the present invention. FIG. Referring to FIG. 5, the gamma converter 500 may include the first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4, and the fifth transistor M5. Include. In addition, the first transistor M1, the third transistor M3, and the fifth transistor M5 are P MOS transistors, and the second transistor M2 and the fourth transistor M4 are implemented as N MOS transistors. In addition, when the first transistor M1, the third transistor M3, and the fifth transistor M5 are implemented as N MOS transistors, the second transistor M2 and the fourth transistor M4 may be implemented as P MOS transistors. It is possible.

The source of the first transistor M1 is connected to the first channel CH1 of the data driver 200 and the drain is connected to the first node N1. The gate is connected to the first gamma conversion signal line GS1.

The source of the second transistor M2 is connected to the third channel CH3 of the data driver 200 and the drain thereof is connected to the second node N2. The gate is connected to the first gamma conversion signal line GS1.

The source of the third transistor M3 is connected to the first node N1 and the drain is connected to the first data line D1. The gate is connected to the second gamma conversion signal line GS2.

The source of the fourth transistor M4 is connected to the second node N2 and the drain is connected to the third data line D3. The gate is connected to the second gamma conversion signal line GS2.

The source of the fifth transistor M5 is connected to the first node N1 and the drain is connected to the second node N2. The gate is connected to the third gamma conversion signal line GS3.

In addition, the second channel CH2 of the data driver is directly connected to the second data line D2.

Red, green, and blue data are output from the first channel CH1, the second channel CH2, and the third channel CH3, and the first data line D1, the second data line D2, and the third data. When red, green, and blue pixels are connected to the line D3 in order, the operation is as follows.

First, when the first gamma conversion signal and the second gamma conversion signal are low and the third gamma conversion signal is high, the first transistor M1 and the third transistor M3 are turned on and the second transistor M2 is turned on. ), The fourth transistor M4 and the fifth transistor M5 are turned off. In this state, red data output from the first channel CH1 is transferred to the first data line D1. Thus, red data is transferred to the red pixel.

After that, when the first gamma conversion signal, the second gamma conversion signal, and the third gamma conversion signal are high, the first transistor M1, the third transistor M3, and the fifth transistor M5 are turned off. The second transistor M2 and the fourth transistor M4 are turned on. In this state, blue data output from the third channel CH3 is transferred to the third data line D3. Therefore, blue data is transferred to the blue pixel.

In this case, the second channel CH2 is directly connected to the second data line D2 so that the green data is transferred to the green pixel.

Blue, green, and red data are output from the first channel CH1, the second channel CH2, and the third channel CH3, and the first data line D1, the second data line D2, and the third data. When red, green, and blue pixels are connected to the line D3 in order, the operation is as follows.

First, when the first gamma conversion signal and the third gamma conversion signal are low and the second gamma conversion signal is high, the first transistor M1, the fourth transistor M4, and the fifth transistor M5 are on. And the second transistor M2 and the third transistor M3 are turned off. In this state, the red data output from the first channel CH1 is transferred to the third data line D3 via the first transistor M1, the fifth transistor M5, and the fourth transistor M4. Thus, red data is transferred to the red pixel.

Then, when the first gamma conversion signal is high and the second gamma conversion signal and the third gamma conversion signal are low, the second transistor M2, the third transistor M3 and the fifth transistor M5 are The state is turned on and the first transistor M1 and the fourth transistor M4 are turned off. In this state, blue data output from the third channel CH3 is transferred to the first data line D1 via the second transistor M2, the fifth transistor M5, and the third transistor M3. Therefore, blue data is transferred to the blue pixel.

In this case, the second channel CH2 is directly connected to the second data line D2 so that the green data is transferred to the green pixel.

Due to the above operation, a data signal with red gamma is transmitted to the red subpixel 101R of the pixel unit 100 and a data signal with green gamma is transmitted to the green subpixel 101G, and the blue subpixel 101B is transmitted. ), A data signal to which blue gamma is applied is transmitted.
However, as shown in the drawing, a plurality of output channels connected to the gamma converter 500 and a plurality of data lines corresponding thereto must be implemented in the same number.

FIG. 6 is a circuit diagram illustrating a third embodiment of a gamma conversion unit employed in an organic light emitting display device according to the present invention. FIG. Referring to FIG. 6, the gamma converter 500 includes a first transistor M1, a second transistor M2, a third transistor M3, and a fourth transistor M4. In addition, although the first transistor M1 to the fourth transistor M4 are implemented as P MOS transistors, the first transistor M1 to the fourth transistor M4 may be implemented as N MOS transistors.

The source of the first transistor M1 is connected to the first channel CH1 of the data driver 200 and the drain is connected to the first data line D1. The gate is connected to the first gamma conversion signal line GS1.

The source of the second transistor M2 is connected to the first channel of the data driver 200 and the drain thereof is connected to the third data line D3. The gate is connected to the second gamma conversion signal line GS2.

The source of the third transistor M3 is connected to the third channel CH3 of the data driver 200 and the drain thereof is connected to the first data line D1. The gate is connected to the second gamma conversion signal line GS2.

The source of the fourth transistor M4 is connected to the third channel CH3 of the data driver 200 and the drain thereof is connected to the third data line D3. The gate is connected to the first gamma conversion signal line GS1.

In addition, the second channel CH2 of the data driver 200 is directly connected to the second data line D2.

When the first gamma conversion signal in a low state is transmitted through the first gamma conversion signal line GS1, the first transistor M1 and the fourth transistor M4 are turned on, and the second gamma conversion signal line GS2 is turned on. When the second gamma conversion signal is transferred through the high state, the second transistor M2 and the third transistor M3 are turned off. That is, the first channel CH1 of the data driver 200 is connected to the first data line D1, the second channel CH2 is connected to the second data line D2, and the third channel CH3 is connected to the first channel CH1. 3 is connected to the data line D3.

When the first gamma conversion signal is transmitted through the first gamma conversion signal line GS1, the first transistor M1 and the fourth transistor M4 are turned off, and the second gamma conversion signal line GS2 is turned off. The second transistor M2 and the third transistor M3 are turned on when the signal in the low state is transmitted through the T1. That is, the first channel CH1 of the data driver 200 is connected to the third data line D3, the second channel CH2 is connected to the second data line D2, and the third channel CH3 is connected to the first channel CH3. 1 is connected to the data line D1.

Therefore, when the first gamma conversion signal transmitted through the first gamma conversion signal line GS1 is low and the second gamma conversion signal transmitted through the second gamma conversion signal line GS2 is high, the first data line D1 is used. ), Red data is transferred to the second data line D2, green data is transferred to the second data line D2, and blue data is transferred to the third data line D3. The first data line D1 when the first gamma conversion signal transmitted through the first gamma conversion signal line GS1 is high and the second gamma conversion signal transmitted through the second gamma conversion signal line GS2 is low. ), Blue data is transferred to the second data line D2, green data is transferred to the second data line D2, and red data is transferred to the third data line D3.

Due to the above operation, a data signal with red gamma is transmitted to the red subpixel 101R of the pixel unit 100 and a data signal with green gamma is transmitted to the green subpixel 101G, and the blue subpixel 101B is transmitted. ), A data signal to which blue gamma is applied is transmitted.
However, as shown in the drawing, a plurality of output channels connected to the gamma converter 500 and a plurality of data lines corresponding thereto must be implemented in the same number.

While preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. You must lose.

1 is a structural diagram showing a structure of an organic light emitting display device according to an exemplary embodiment of the present invention.

FIG. 2 is a structural diagram illustrating an arrangement of pixels of a pixel part of the organic light emitting display device illustrated in FIG. 1.

3 is a circuit diagram illustrating a gamma correction unit employed in an organic light emitting display device according to the present invention.

FIG. 4 is a circuit diagram illustrating a first embodiment of a gamma conversion unit employed in an organic light emitting display device according to the present invention. FIG.

FIG. 5 is a circuit diagram illustrating a second embodiment of a gamma conversion unit employed in an organic light emitting display device according to the present invention. FIG.

FIG. 6 is a circuit diagram illustrating a third embodiment of a gamma conversion unit employed in an organic light emitting display device according to the present invention. FIG.

Claims (11)

A pixel unit including red, green, and blue pixels and emitting light from the red, green, and blue pixels in response to a data signal and a scan signal; The red, green, and blue image signals, which are located above or below the pixel portion, and are output from a plurality of output channels, are applied to data lines connected to each pixel as corresponding data signals. A data driver for repeatedly outputting a red data signal, a green data signal, and a blue data signal according to the number order of the plurality of output channels; A scan driver which outputs the scan signal; A gamma correction unit for determining a voltage of the red data signal corresponding to the red image signal, a voltage of the green data signal corresponding to the green image signal, and a voltage of the blue data signal corresponding to the blue image signal; And A plurality of transistors are provided between the plurality of output channels and the corresponding data lines, and are controlled by a gamma conversion signal to transmit the red data signal to the red pixel regardless of the position of the data driver. And a gamma converter configured to transmit the green data signal to the green pixel and to transmit the blue data signal to the blue pixel. The plurality of output channels and the plurality of data lines corresponding to the plurality of output channels are implemented in the same number of organic light emitting display device. The method of claim 1, The gamma conversion unit A first transistor connected to a first output channel for outputting a data signal, a second electrode connected to a first data line, and a gate connected to a gamma conversion signal line; A second transistor connected to the first output channel, a second electrode connected to a third data line, and a gate connected to the gamma conversion signal line; A third transistor having a first electrode connected to a third output channel for outputting a data signal, a second electrode connected to the first data line, and a gate connected to the gamma conversion signal line; And A first transistor connected to the third output channel, a second electrode connected to the third data line, and a gate connected to the gamma conversion signal line; And the first and third transistors and the second and fourth transistors are turned on at different times. The method of claim 2, And the gamma converter determines on / off states of the first and third transistors and the second and fourth transistors in correspondence with positions of the data driver. The method of claim 1, The gamma conversion unit A first transistor connected to a first output channel through which the data signal is output, a second electrode connected to a first node, and a gate connected to a first gamma conversion signal line; A second transistor connected to a third output channel through which the data signal is output, a second electrode connected to a second node, and a gate connected to the first gamma conversion signal line; A third transistor connected to a first electrode, a second electrode connected to a first data line, and a gate connected to a second gamma conversion signal line; A fourth transistor having a first electrode connected to the second node, a second electrode connected to a third data line, and a gate connected to the second gamma conversion signal line; And a first transistor connected to the first node, a second electrode connected to the second node, and a gate connected to a third gamma conversion signal line. The method of claim 4, wherein And the second and fourth transistors are N MOS transistors if the first, third and fifth transistors are P MOS transistors. The method of claim 5, The gamma conversion unit And an on / off state of the first, third and fifth transistors and the second and fourth transistors according to the position of the data driver. The method of claim 1, The gamma conversion unit A first transistor connected to a first output channel for outputting a data signal, a second electrode connected to a first data line, and a gate connected to a second gamma conversion signal line; A second transistor connected to the first output channel, a second electrode connected to a third data line, and a gate connected to the first gamma conversion signal line; A third transistor having a first electrode connected to a third output channel for outputting a data signal, a second electrode connected to the first data line, and a gate connected to the first gamma conversion signal line; And a fourth transistor connected to the first output channel, a second electrode connected to the third data line, and a gate connected to the second gamma conversion signal line. The method of claim 7, wherein And the first and fourth transistors and the second and third transistors are turned on at different times. The method of claim 8, The gamma conversion unit And an on / off state of the first and fourth transistors and the second and third transistors in correspondence with the position of the data driver. In a method of driving an organic light emitting display device, Generating red, green and blue data signals using the red, green and blue video signals; Outputting the red, green, and blue data signals to which red gamma, green gamma, and blue gamma are respectively applied in order of number of output channels of a data driver; The red, green, and blue data signals output from the respective output channels are applied to a plurality of data lines corresponding to the plurality of output channels, and the red data signal is applied to the red pixel regardless of the position of the data driver. Causing the green data signal to be transmitted to the green pixel, and transmitting the blue data signal to the blue pixel. And the plurality of output channels and the plurality of data lines corresponding thereto are implemented in the same number. 11. The method of claim 10, The output channels of the data driver and the data lines corresponding thereto are connected to each other differently as the data driver is positioned above the pixel unit or below the pixel unit.

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