KR20110074348A - Organic electroluminescent display device and method of driving the same - Google Patents

Abstract

PURPOSE: An organic electroluminescent display device and a driving method thereof are provided to compensate a luminance deviation at each position by generating a data signal according to luminance at each position in an organic electroluminescent panel. CONSTITUTION: An organic electroluminescence panel displays images. A gate drive unit(130) supplies a gate signal to the organic electroluminescence panel. A data drive unit(140) supplies a data signal to the organic electroluminescence panel. A timing control unit(160) outputs a deviation signal including the information about the luminance deviation at each position of the organic electroluminescence panel. A gamma reference voltage unit(150) supplies a gamma reference voltage generated through the deviation signal to the data drive unit.

Description

Organic electroluminescent display and its driving method {ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE AND METHOD OF DRIVING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device and a method of driving the same, which compensate for a positional deviation.

One of the new flat panel displays, the organic electroluminescent display device (OLED device) is a self-luminous type, so it has better viewing angle and contrast ratio than liquid crystal display device and does not require backlight. Light weight and thinness are possible, and it is advantageous in terms of power consumption. In addition, since it is possible to drive DC low voltage, fast response speed, and all solid, it is strong against external shock, wide use temperature range, and especially in terms of manufacturing cost. Such an organic light emitting display device is also referred to as an organic light emitting diode device (OLED device).

The organic light emitting display device is a deposition and encapsulation equipment because the process is very simple, unlike a liquid crystal display device or a plasma display panel device (PDP device).

In particular, in an active matrix type, a voltage controlling a current applied to the pixel region is charged in a storage capacitor, and the voltage is maintained until the next frame signal is applied. It is driven to maintain the light emitting state while one screen is displayed regardless of the number of gate wirings.

Therefore, in the active matrix system, since the same luminance is displayed even when a low current is applied, low power consumption, high definition, and large size can be obtained.

Hereinafter, the basic structure and operation characteristics of the active matrix organic light emitting display device will be described in detail with reference to the accompanying drawings.

1 illustrates a conventional organic light emitting display device.

As shown in FIG. 1, the conventional organic light emitting display device 10 is an organic light emitting panel 20 for displaying an image and a gate driver 30 for supplying a gate signal to the organic light emitting panel 20. ), A data driver 40 for supplying a data signal to the organic light emitting panel 20, a gamma reference voltage part 50 for supplying a gamma reference voltage to the data driver 40, and a gate driver 30. And a timing controller 60 which supplies a gate control signal and supplies an RGB signal and a data control signal to the data driver 40.

In the organic light emitting panel 20, a gate line GL and a data line DL are formed to cross each other, and the switching transistor Tsw and one pixel area P are formed in the organic light emitting panel 20. The driving transistor Tdr, the storage capacitor Cst, and the light emitting diode Del are formed.

The switching transistor Tsw is connected to the gate line GL and the data line DL, the driving transistor Tdr and the storage capacitor Cst are connected to the switching transistor Tsw, and the driving transistor Tdr and the light emitting diode. Del is connected between the high potential voltage VDD and the low potential voltage VSS.

The switching transistor Tsw is turned on according to the gate signal supplied through the gate line GL to drive the data signal supplied through the data line DL to the driving transistor Tdr and the storage capacitor Cst. To pass).

The driving transistor Tdr is turned on according to a data signal to control an electric current flowing through the light emitting diode Del to display an image.

That is, the amount of current flowing through the light emitting diode Del is proportional to the magnitude of the data signal, and the intensity of light emitted by the light emitting diode Del is proportional to the amount of current flowing through the light emitting diode Del. ) Displays different gray scales according to the magnitude of the data signal, and as a result, the organic light emitting display device 10 displays an image.

The storage capacitor Cst maintains a charge corresponding to the data signal for one frame to maintain a constant amount of current flowing through the light emitting diode Del, and to maintain a constant gray level displayed by the light emitting diode Del. Do it.

The gate driver 30 generates a gate signal using the gate control signal input from the timing controller 60, and supplies the generated gate signal to the organic light emitting panel 20, and the data driver 40 includes the timing controller ( 60 generates a data signal using the RGB signal and the data control signal received from the 60 and supplies the generated data signal to the organic light emitting panel 20

The timing controller 60 generates a gate control signal, an RGB signal, and a data control signal by using an image signal and a control signal input from an external system (not shown), and supplies the generated gate control signal to the gate driver 30. The generated RGB signal and the data control signal are supplied to the data driver 40.

Here, the data driver 40 may be composed of a plurality of driving integrated circuits (DICs), and each of the plurality of driving integrated circuits converts RGB signals, which are digital signals, into data signals, which are analog signals. The gamma reference voltage is supplied from the gamma reference voltage unit 50 for analog conversion.

The configuration of the gamma reference voltage unit 50 and the data driver 40 will be described in detail with reference to the drawings.

2 is a diagram illustrating a gamma reference voltage unit and a data driver of a conventional organic light emitting display device.

As shown in FIG. 2, the gamma reference voltage unit 50 of the conventional organic light emitting display device (10 of FIG. 1) includes a p-gamma IC (programmable gamma integrated circuit) 52 and a resistor string. 54, the data driver 40 includes first to nth driving integrated circuits (DICs) 42.

The p-gamma IC 52 generates a red gamma driving voltage, a green gamma driving voltage, and a blue gamma driving voltage and supplies it to the resistance string 54.

The resistor string 54 includes a red resistor string, a green resistor string, and a blue resistor string, each of which is composed of a plurality of resistors connected in series.

Here, the red, green, and blue gamma driving voltages of the output of the p-gamma IC 52 are supplied to one end of the red, green, and blue resistor strings, respectively, so that each connection node of the plurality of resistors has different potentials according to the voltage distribution law. The potential of each connection node is output as red gamma reference voltage, green gamma reference voltage, and blue gamma reference voltage.

The red, green, and blue gamma reference voltages output from the resistor string are supplied to the first to n-th DICs 42, and each of the first to n-th DICs 42 uses the red, green, and blue gamma reference voltages to provide a data signal. Create

As described above, in the conventional organic light emitting display device, since the plurality of driving integrated circuits of the data driver 40 generate data signals using the same red, green, and blue gamma reference voltages, the same voltage value is applied to the RGB signals of the same gray scale. It generates a data signal having a.

By the way, in the organic light emitting display device, the organic light emitting display panel is positioned according to the position of the organic light emitting panel due to the thickness and mobility of the gate insulating film of the thin film transistor, the current difference due to the resistance of the active layer, and the efficiency difference according to the optical path. Luminance deviation may occur.

The luminance deviation of each position causes the deterioration of the image quality of the organic light emitting display device. In particular, the large area organic light emitting display device may become a more serious problem.

The present invention is to solve the above problems, in the organic light emitting display device, by measuring the luminance of the organic light emitting panel for each position, by generating and supplying a different gamma reference voltage for each position using the measured luminance, An object of the present invention is to provide an organic light emitting display device and a method of driving the same, wherein the luminance deviation of each position is compensated for.

In order to achieve the above object, the present invention provides an organic electroluminescent panel for displaying an image; A gate driver supplying a gate signal to the organic light emitting panel; A data driver supplying a data signal to the organic light emitting panel; A timing controller configured to supply a gate control signal to the gate driver, to supply an RGB signal and a data control signal to the data driver, and to output a deviation signal including information on luminance deviation for each position of the organic light emitting panel; An organic light emitting display device includes a gamma reference voltage unit configured to supply a gamma reference voltage generated using the deviation signal to the data driver.

The gamma reference voltage unit may include a p-gamma IC configured to generate and output first to nth gamma driving voltages using the deviation signal; And a first through n-th resistance strings configured to generate and output first through n-th gamma reference voltages using the first through n-th gamma driving voltages, respectively, wherein the data driver includes the first through n-th gamma reference voltages. These may include the first to n-th driving integrated circuit (DIC) respectively input.

The first to n-th gamma driving voltages may include red, green, and blue gamma driving voltages, respectively, and the first to n-th resistance strings may include red, green, and blue resistance strings, respectively.

The red, green, and blue resistance strings may include first to mth resistors connected in series, respectively, and the red, green, and blue resistance strings may be connected to one end of the first to mth resistances of the red, green, and blue resistance strings, respectively. The blue gamma driving voltage is applied, and one end of the first to mth resistors of the red, green, and blue resistance strings may be grounded.

The first to nth gamma reference voltages may include first to (m-1) gamma reference voltages, first to (m-1) green gamma reference voltages, and first to (m-1) blue, respectively. It may include a gamma reference voltage.

The organic light emitting display device may further include a luminance measuring unit measuring luminance of each vertical column region of the organic light emitting panel, generating luminance information for each position as a luminance signal, and supplying the luminance signal to the timing controller.

On the other hand, the timing control unit, the step of generating a deviation signal according to the position-specific brightness of the organic light emitting panel and transmitting to the gamma reference voltage unit; The gamma reference voltage unit generates the first to nth gamma driving voltages using the deviation signal, generates the first to nth gamma reference voltages using the first to nth gamma driving voltages, and transmits the generated data to the data driver. Making a step; Generating, by the data driver, a data signal using the first to nth gamma reference voltages and supplying the data signal to the organic light emitting panel; Supplying a gate signal to the organic light emitting panel by a gate driver; A method of driving an organic light emitting display device, the method comprising displaying an image by the organic light emitting panel using the gate signal and the data signal.

The gamma reference voltage unit may generate the first to nth gamma driving voltages and the first to nth gamma reference voltages and transmit them to the data driver. Generating the first to nth gamma driving voltages using the deviation signal; The first to nth resistance strings of the gamma reference voltage unit may include generating first to nth gamma reference voltages using the first to nth gamma driving voltages, respectively.

The data driver may generate the data signal and supply the data signal to the organic light emitting panel, wherein the first to nth driving integrated circuits (DICs) of the data driver are respectively configured to the first to nth gamma reference voltages. The method may include generating the data signal by using.

The method of driving the organic light emitting display device may further include: measuring, by the luminance measuring unit, luminance of each vertical column region of the organic light emitting panel, generating luminance information for each position as a luminance signal, and transmitting the luminance information to the timing controller. It may further include.

As described above, in the organic light emitting display device according to the present invention, by generating a data signal using a different gamma reference voltage according to the position-specific luminance of the organic light emitting panel, the luminance deviation by position is compensated to improve the image quality do.

That is, by supplying different gamma reference voltages in consideration of luminance by position to a plurality of driving integrated circuits of the data driver, data signals having different voltage values can be generated with respect to RGB signals of the same gray scale, and as a result, an organic light emitting panel It is possible to compensate the luminance deviation for each position of.

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

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

As shown in FIG. 3, the organic light emitting display device 110 according to an exemplary embodiment of the present invention is an organic light emitting panel 120 displaying an image and supplies a gate signal to the organic light emitting panel 120. A gate driver 130, a data driver 140 to supply a data signal to the organic light emitting panel 120, a gamma reference voltage unit 150 to supply a gamma reference voltage to the data driver 140, and a gate. The luminance control unit for measuring the luminance of the organic light emitting panel 120 and the timing control unit 160 for supplying the gate control signal to the driver 30 and the RGB signal and the data control signal to the data driver 140, by position. And 170.

In the organic light emitting panel 120, a gate line GL and a data line DL defining a pixel region P are formed to cross each other. In one pixel region P, a switching transistor Tsw and a driving transistor are formed. Tdr, the storage capacitor Cst, and the light emitting diode Del are formed.

The switching transistor Tsw is connected to the gate line GL and the data line DL, the driving transistor Tdr and the storage capacitor Cst are connected to the switching transistor Tsw, and the driving transistor Tdr and the light emitting diode. Del is connected between the high potential voltage VDD and the low potential voltage VSS.

The switching transistor Tsw is turned on according to the gate signal supplied through the gate line GL to drive the data signal supplied through the data line DL to the driving transistor Tdr and the storage capacitor Cst. To pass).

The driving transistor Tdr is turned on according to a data signal to control an electric current flowing through the light emitting diode Del to display an image.

That is, the amount of current flowing through the light emitting diode Del is proportional to the magnitude of the data signal, and the intensity of light emitted by the light emitting diode Del is proportional to the amount of current flowing through the light emitting diode Del. ) Displays different gray scales according to the magnitude of the data signal, and as a result, the organic light emitting display device 110 displays an image.

The storage capacitor Cst maintains a charge corresponding to the data signal for one frame to maintain a constant amount of current flowing through the light emitting diode Del, and to maintain a constant gray level displayed by the light emitting diode Del. Do it.

The gate driver 130 may include a gate such as a gate output enable (GOE), a gate start pulse (GSP), a gate shift clock (GSC), etc. received from the timing controller 160. The gate signal is generated using the control signal, and the generated gate signal is supplied to the organic light emitting panel 20, and the data driver 40 is applied to the RGB signal and the source output in, which are digital data input from the timing controller 60. A data signal, which is analog data, is generated by using a data control signal such as source output enable (SOE), source start pulse (SSP), and source sampling clock (SSC). To the organic electroluminescent panel 120

The timing controller 160 is a video signal and data enable (DE), a vertical synchronization signal (VSY), a horizontal synchronization signal received from an external system (not shown) such as a TV set or a computer graphics card. generating a gate control signal, an RGB signal, and a data control signal using control signals such as a horizontal synchronization (HSY) and a clock, supplying the generated gate control signal to the gate driver 130, and generating the generated RGB signal. And a data control signal to the data driver 140.

Herein, the data driver 140 may include first to nth driving integrated circuits (DICs) (142 of FIG. 4), and the first to nth driving integrated circuits 142 may be digital data. The RGB signal is converted into a data signal which is analog data, and the gamma reference voltage is supplied from the gamma reference voltage unit 150 for the digital-analog conversion.

In addition, the organic light emitting panel 120 is divided into first to n vertical thermal regions (not shown), and the first to nth DICs 142 of the data driver 140 are each formed of the organic light emitting panel 120. The data signal is supplied to a data line corresponding to the 1 th to n th vertical column regions.

In addition, the luminance measuring unit 170 measures the luminance of the organic light emitting panel 120 for each of the first to nth vertical column regions, generates luminance information for each position as a luminance signal, and supplies the luminance information to the timing controller 160.

The luminance measuring unit 170 may be embedded in the organic light emitting display device 110 or may be a measurement device independent of the organic light emitting display device 110.

The timing controller 160 analyzes the luminance signal received from the luminance measuring unit 170 to generate luminance information for each of the first to nth vertical regions of the organic light emitting panel 120 as deviation information, thereby generating the gamma reference voltage unit 150. Supplies).

At this time, the timing controller 160 and the gamma reference voltage unit 150 may communicate using I2C communication.

Here, the I2C communication is one of serial interface protocols mainly used for communication between an integrated circuit (IC) and an integrated circuit (IC), and a device such as an integrated circuit (IC) is divided between two devices. The serial data SDA and the serial clock SCL are transmitted through two wires.

The serial data SDA is serially transmitted and is 0 or 1 digital data having 8 bits as 1 byte, and the serial clock SCL is caused by rising and falling. This is a clock signal that transmits 1 bit.

Thus, using I2C communication, one device can get data from another device (read) or write data to another device (write).

A device that generates a serial clock (SCL) is called a master device and a device that accepts a serial clock (SCL) is called a slave device. A slave device has its own address, so that its address is first. Respond only to signal blocks (one frame).

Such a master device and a slave device may be connected in a daisy chain form in which two wires are connected in parallel to each device.

 That is, when the master device transmits serial data (SDA) and serial clock (SCL), the slave device counts the serial clock (SCL) to grasp the corresponding data and responds to the master device's request (read / write). Thus, the master device can grasp the data of the slave device or write data to the slave device.

The gamma reference voltage unit 150 generates a gamma reference voltage for each of the first to nth vertical column regions of the organic light emitting panel 120 by using the deviation signal input from the timing controller 160 to the data driver 140. Supply.

Accordingly, the data driver 140 generates a data signal by using gamma reference voltages of the first to nth vertical column regions of the organic light emitting panel 120, and thus, the first to the first to fifth parts of the organic light emitting panel 120. It is possible to compensate the luminance deviation for each vertical column area.

The configuration of the gamma reference voltage unit 150 and the data driver 140 will be described in detail with reference to the drawings.

4 is a diagram illustrating a gamma reference voltage unit and a data driver of an organic light emitting display device according to an exemplary embodiment of the present invention.

As shown in FIG. 4, the gamma reference voltage unit 150 of the organic light emitting display device 110 according to the exemplary embodiment of the present invention may include a p-gamma IC (152). The first to n th resistor strings 154 are included, and the data driver 140 includes first to n th driving integrated circuits (DICs) 142.

The p-gamma IC 152 may include first to nth gamma driving voltages, first to nth green gamma driving voltages, and first to nth blue gamma driving voltages in consideration of the deviation signal received from the timing controller 160. Are generated and supplied to the first to n th resistance strings 154, respectively.

That is, the p-gamma IC 152 supplies the first, green, and blue gamma driving voltages to the first resistor string, the second, green, and blue gamma driving voltages to the second resistor string, and the n-th The red, green, and blue gamma driving voltages are supplied to the nth resistor string.

Each of the first to n-th resistance strings 154 includes a red resistor string, a green resistor string, and a blue resistor string, and each of the red, green, and blue resistor strings includes a plurality of resistors connected in series.

Here, the first to n-th, green, and blue gamma driving voltages output from the p-gamma IC 152 may be provided at one end of each of the red, green, and blue resistance strings of the first to n-th resistance strings 154, respectively. Each connection node of the plurality of resistors is supplied to have different potentials according to the voltage distribution law, and the potentials of the connection nodes are first to nth gamma reference voltages, first to nth green gamma reference voltages, and first to nth. It is output as the nth gamma reference voltage.

The first to nth red, green, and blue gamma reference voltages output from the first to nth resistor strings 154 are respectively supplied to the first to nth DICs 142, and the first to nth DICs 142 are respectively. A data signal is generated using the first to nth red, green, and blue gamma reference voltages.

That is, the p-gamma IC 152 generates the first, green, and blue gamma driving voltages in consideration of the deviation signal, and supplies them to the first resistance string 154, and the first resistance string 154 is the first product. And generate the first red, green, and blue gamma reference voltages using the green and blue gamma driving voltages, and supply them to the first DIC 142, and the first DIC 142 uses the first red, green, and blue gamma reference voltages. The data signal is generated and supplied to a data line corresponding to the first vertical column region of the organic light emitting panel 120.

Similarly, the p-gamma IC 152 generates the second, green, and blue gamma driving voltages in consideration of the deviation signal, and supplies them to the second resistance string 154, and the second resistance string 154 is the second product. The second, green, and blue gamma reference voltages are generated and supplied to the second DIC 142, and the second DIC 142 uses the second, green, and blue gamma reference voltages. Generates a data signal and supplies the data signal to a data line corresponding to the second vertical column region of the organic light emitting panel 120, and the p-gamma IC 152 drives the n-, green, and blue gamma driving signals in consideration of the deviation signal. A voltage is generated and supplied to the n-th resistance string 154, and the n-th resistance string 154 generates the n-th, green, and blue gamma reference voltages using the n-th, green, and blue gamma driving voltages. The nDIC 142 generates a data signal using the nth, green, and blue gamma reference voltages, and supplies the nDIC 142 to the nth vertical column region of the organic light emitting panel 120. Supply to the corresponding data wiring.

Therefore, the data driver 140 may improve the luminance uniformity and the image quality of the organic light emitting display device 110 by generating a data signal having a luminance deviation compensated for each position and supplying the same to the organic light emitting panel 120. .

For example, when the luminance of any vertical thermal region is higher than the overall average luminance of the organic light emitting panel 120, the red, green, and blue gamma driving voltages having a relatively low voltage are selected to thereby select red, green, and blue gamma. The voltage value of the reference voltage and the data signal can be lowered and the luminance of any vertical column region can be reduced, and when the luminance of any vertical column region is lower than the overall average luminance of the organic light emitting panel 120, By allowing the red, green, and blue gamma driving voltages to be selected, the voltage values of the red, green, and blue gamma reference voltages and data signals can be increased, and the luminance of any vertical column region can be increased.

An example of the configuration of the p-gamma IC and the resistance string will be described with reference to the drawings.

5 illustrates a p-gamma IC of a gamma reference voltage unit of an organic light emitting display device according to an exemplary embodiment of the present invention.

As shown in FIG. 5, the p-gamma IC 152 of the gamma reference voltage unit 150 of FIG. 3 includes the interface 181, the first and second memory banks 183 and 185, and the first and the first. 2DAC registers 187 and 189, a plurality of DACs 191, a plurality of buffers 193.

The interface 181 is for I2C communication with the timing controller 160 of FIG. 3. The interface 181 analyzes a transmission signal in the form of serial data (SDA) and serial clock (SCL) to locate the organic light emitting panel (120 of FIG. 3). The deviation signal for each luminance is grasped and a driving signal corresponding to the deviation signal is stored in the first and second memory banks 183 and 185.

In addition, the interface 181 controls the first and second DAC registers 187 and 189 to output driving signals stored in the first and second memory banks 183 and 185, and the output driving signals include a plurality of DACs. The driving signal is input to the 191 and is converted, and the converted driving signal is output as the first to n-th red, green, and blue gamma driving voltages through the plurality of buffers 193.

Here, the plurality of DACs 191 and the plurality of buffers 193 include 3n or more DACs and buffers, respectively.

Therefore, the p-gamma IC 152 outputs first to nth red, green, and blue gamma driving voltages having different voltage values for each vertical column region of the organic light emitting panel 120.

FIG. 6 is a diagram illustrating one resistance string of a gamma reference voltage unit of an organic light emitting display according to an exemplary embodiment of the present invention, wherein the first to nth resistance strings are the same except for the difference in the applied gamma driving voltage. Since it may have a configuration, the first resistance string will be described as an example.

As shown in FIG. 6, the first resistance string 154 of FIG. 4 includes a first resistance string, a first rust resistance string, and a first blue resistance string, and the first, green, and blue resistance strings include: Each of the first to m-th resistor (R1 to Rm) connected in series.

One end of the first resistance string is applied with a first gamma driving voltage output from the p-gamma IC (152 in FIG. 4), and one end of the first rust resistance string is output from the p-gamma IC (152). The first green gamma driving voltage is applied, and the first blue gamma driving voltage output from the p-gamma IC 152 is applied to one end of the first blue resistance string. The other end is grounded.

Accordingly, the connection nodes of the first, green, and blue resistance strings each have different potentials according to the voltage distribution law, and the first to (m-1) first gamma reference voltages from the connection node of the first resistance string. A first gamma reference voltage consisting of (GMA1R1 to GMA (m-1) R1) is output, and the first to (m-1) green first gamma reference voltages GMA1G1 to GMA from the connection node of the first green resistance string. The first green gamma reference voltage consisting of (m-1) G1) is outputted, and the first to first m-1 gamma reference voltages GMA1B1 to GMA (m-1) are output from the connection node of the first blue resistance string. The first blue gamma reference voltage consisting of B1) is output.

Although not shown, the second gamma reference voltages of the first to the (m-1) second gamma reference voltages GMA1R2 to GMA (m-1) R2 from the connection nodes of the second, green, and blue resistance strings, respectively. , A second green gamma reference voltage of the first to (m-1) green 2 gamma reference voltages GMA1G2 to GMA (m-1) G2, and a first to (m-1) blue second gamma reference voltage GMA1B2 To GMA (m-1) B2), the second blue gamma reference voltage is output, and the first to m-th n-th gamma reference voltages GMA1Rn from the connection nodes of the nth, green, and blue resistance strings. To n-th gamma reference voltage of GMA (m-1) Rn), n-th gamma reference voltage of first to (m-1) th green gamma reference voltage (GMA1Gn to GMA (m-1) Gn), The nth blue gamma reference voltages of the first to (m-1) th blue n gamma reference voltages GMA1Bn to GMA (m-1) Bn are output.

Therefore, the first to n-th, green, and blue resistance strings are the first, green, and blue gamma reference voltages having different voltage values for the vertical thermal regions of the organic light emitting panel 120, and the second, green, and blue colors. Gamma reference voltage,, n-th, green, blue Gamma reference voltage is outputted.

The operation of the organic light emitting display device will be described with reference to the drawings.

7 is a flowchart illustrating an operation of an organic light emitting display device according to an embodiment of the present invention.

As shown in FIG. 7, the luminance measuring unit 170 of FIG. 3 measures luminance of each vertical column of the organic light emitting panel 120 of FIG. 3 and generates the luminance signal as a luminance signal (st10). The luminance signal including the information about the signal is transmitted to the timing controller 160 of FIG. 3 (st12).

The timing controller 160 generates a deviation signal using the luminance signal received from the luminance measuring unit 170 (st14), and outputs a deviation signal including information on luminance deviation for each region to the gamma reference voltage unit (see FIG. 3). 150) (st16).

The p-gamma IC (152 in FIG. 4) of the gamma reference voltage unit 150 generates first to nth red, green, and blue gamma driving voltages using the deviation signal received from the timing controller 160 (st18). ) And transmit the generated first to n-th red, green, and blue gamma driving voltages to the first to n-th red, green, and blue resistance strings of the gamma reference voltage unit 150 (154 of FIG. 4) (st20). ).

The first to n-th red, green, and blue resistance strings 154 output the first to n-th red, green, and blue gamma reference voltages, respectively, and transmit the first to n-th red, green, and blue gamma reference voltages to the first to n-th DICs (142 of FIG. 4). st22).

That is, the first red, green, and blue gamma reference voltages GMA1R1 to GMA (m-1) R1, GMA1G1 to GMA (m-1) G1, and GMA1B1 to output from the first, green, and blue resistance strings 154. GMA (m-1) B1) is transmitted to the first DIC 142, and outputs the second, green and blue gamma reference voltages GMA1R2 to GMA (m-1) R2 output from the second, green and blue resistance strings. , GMA1G2 to GMA (m-1) G2 and GMA1B2 to GMA (m-1) B2) are transmitted to the second DIC 142. Similarly, the nth, green, and blue gamma reference voltages GMA1Rn to GMA (m-1) Rn, GMA1Gn to GMA (m-1) Gn, and GMA1Bn to GMA (m outputted from the nth, green, and blue resistance strings are output. -1) Bn) is transmitted to the nth DIC 142.

The first to n-th DIC 142 generates a data signal using the first to n-th red, green, and blue gamma reference voltages output from the first to n-th red, green, and blue resistance strings 154, respectively ( st24), the generated data signal is transmitted to the data line of the vertical column area of the organic light emitting panel 120 (st26).

That is, in the organic light emitting display device 110 according to the exemplary embodiment of the present invention, since the data signal is generated by using gamma reference voltages of different voltage values, the luminance deviation of each region is compensated, different voltages are applied to the RGB signals of the same gray scale. Generates a data signal of the value and displays the image.

Accordingly, the organic light emitting display device 110 according to an embodiment of the present invention displays an image using a data signal compensated for the luminance deviation for each vertical column of the organic light emitting panel 120, thereby providing uniformity and image quality. This is improved.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

1 is a view illustrating a conventional organic light emitting display device.

2 is a diagram illustrating a gamma reference voltage unit and a data driver of an organic light emitting display device according to the related art.

3 illustrates an organic light emitting display device according to an exemplary embodiment of the present invention.

4 is a diagram illustrating a gamma reference voltage unit and a data driver of an organic light emitting display device according to an exemplary embodiment of the present invention.

FIG. 5 illustrates a p-gamma IC of a gamma reference voltage unit of an organic light emitting display device according to an exemplary embodiment of the present invention. FIG.

6 is a diagram illustrating one resistance string of a gamma reference voltage unit of an organic light emitting display device according to an exemplary embodiment of the present invention.

7 is a flowchart illustrating an operation of an organic light emitting display device according to an embodiment of the present invention.

Claims (10)

An organic light emitting panel displaying an image; A gate driver supplying a gate signal to the organic light emitting panel; A data driver supplying a data signal to the organic light emitting panel; A timing controller configured to supply a gate control signal to the gate driver, to supply an RGB signal and a data control signal to the data driver, and to output a deviation signal including information on luminance deviation for each position of the organic light emitting panel; A gamma reference voltage unit supplying a gamma reference voltage generated using the deviation signal to the data driver An organic light emitting display device comprising a. The method of claim 1, The gamma reference voltage unit may include a p-gamma IC configured to generate and output first to nth gamma driving voltages using the deviation signal; A first to n-th resistance string configured to generate and output first to n-th gamma reference voltages using the first to n-th gamma driving voltages, respectively. And the data driver comprises first to nth driving integrated circuits (DICs) to which the first to nth gamma reference voltages are respectively input. The method of claim 2, The first to n-th gamma driving voltages include red, green, and blue gamma driving voltages, respectively, and the first to n-th resistance strings include red, green, and blue resistance strings, respectively. The method of claim 3, wherein The red, green, and blue resistance strings include first to mth resistors connected in series, respectively, and the red, green, and blue gamma rays are respectively formed at one end of the first to mth resistors of the red, green, and blue resistance strings. And a driving voltage is applied, and one end of the first to mth resistors of the red, green, and blue resistance strings is grounded. The method of claim 4, wherein The first to nth gamma reference voltages may include first to (m-1) gamma reference voltages, first to (m-1) green gamma reference voltages, and first to (m-1) blue gamma references, respectively. An organic light emitting display device comprising a voltage. The method of claim 1, And a luminance measuring unit measuring luminance of each vertical column of the organic light emitting panel and generating luminance information for each position as a luminance signal and supplying the luminance signal to the timing controller. Generating, by the timing controller, a deviation signal according to the position-specific luminance of the organic light emitting panel and transmitting the deviation signal to the gamma reference voltage unit; The gamma reference voltage unit generates first to nth gamma driving voltages using the deviation signal, generates first to nth gamma reference voltages using the first to nth gamma driving voltages, and transmits the same to the data driver. Making a step; Generating, by the data driver, a data signal using the first to nth gamma reference voltages and supplying the data signal to the organic light emitting panel; Supplying a gate signal to the organic light emitting panel by a gate driver; Displaying the image by the organic light emitting panel using the gate signal and the data signal; Method of driving an organic light emitting display device comprising a. The method of claim 7, wherein The step of generating the first to n-th gamma driving voltage and the first to n-th gamma reference voltage by the gamma reference voltage unit, and transmitting to the data driver, Generating, by the p-gamma IC of the gamma reference voltage unit, the first to nth gamma driving voltages using the deviation signal; Generating first to nth gamma reference voltages using the first to nth gamma driving voltages of the first to nth resistance strings of the gamma reference voltage unit, respectively. Method of driving an organic light emitting display device comprising a. The method of claim 8, The data driver may generate the data signal and supply the data signal to the organic light emitting panel, wherein each of the first to nth driving integrated circuits DIC uses the first to nth gamma reference voltages. And generating the data signal by using the organic light emitting display device. The method of claim 9, And a luminance measuring unit measuring luminance of each vertical column region of the organic light emitting panel, generating luminance information for each position as a luminance signal, and transmitting the luminance information to the timing controller.

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