KR20140021325A - Organic light emitting diode display device and method of driving the same - Google Patents

Abstract

Provided is an organic light emitting diode display device including a driving part analyzing a RGB signal, calculating a boundary intensity for multiple pixels and generating a modulated RGB signal by reducing the brightness of the multiple pixels according to the boundary intensity; and a display panel for displaying an image using the modulated RGB signal. [Reference numerals] (120) First conversion unit; (140) Detection unit; (150) Modulation unit; (160) Second conversion unit; (AA) RGB signal; (BB) YCbCr signal; (CC) Boundary signal, YCbCr signal; (DD) Modulated YCbCr signal; (EE) Modulated RGB signal

Description

[0001] The present invention relates to an organic light emitting diode (OLED) display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device and a driving method thereof, in which deterioration and afterimage of a light emitting diode are prevented by limiting a current applied to the light emitting diode.

An organic light emitting diode (OLED) display device, which is one of a flat panel display (FPD), has high luminance and low operating voltage characteristics.

In addition, since it is a self-luminous type that emits light by itself, it has a large contrast ratio, can realize an ultra-thin display, can realize a moving image with a response time of several microseconds (μs), has no viewing angle limit, And it is driven with a low voltage of 5 to 15 V direct current, so that it is easy to manufacture and design a driving circuit.

In addition, since the manufacturing process of the organic light emitting diode display device is all of deposition and encapsulation, the manufacturing process is very simple.

However, unlike a liquid crystal display device, an organic light emitting diode display device is a current driving type in which current is supplied to a light emitting diode to emit light. Therefore, it is more important to reduce driving current and power consumption.

A method of reducing the power consumption of the organic light emitting diode display device will be described with reference to the drawings.

1 is a view for explaining a power consumption reduction method of a conventional organic light emitting diode display device.

As shown in FIG. 1, power consumption of the organic light emitting diode display device can be reduced by decreasing the maximum luminance and the driving current according to the average of the gray level of the image of one frame.

The average picture level (APL) can be defined as a ratio of the average of the gradations of the image of one frame to the maximum gradation. The maximum luminance and driving current of the organic light emitting diode display are decreased .

That is, when the average image level is less than the reference value, the first luminance is set to the maximum luminance, and when the average image level is larger than the reference value, the second luminance smaller than the first luminance is set to the maximum luminance, And the second luminance can be linearly determined along a straight line connecting the third luminance and the first luminance when the average image level is the maximum value of 100%.

For example, when the reference value is 25%, when the average image level is 25% or less, the first luminance of 500 nits is set to the maximum luminance of the organic light emitting diode display, and the image is displayed. 100%, it is possible to display the image with the reduced driving current by setting the third luminance of 150nit to the maximum luminance of the organic light emitting diode display device.

In the case where the average image level is 35% larger than the reference value of 25%, the second luminance corresponding to 35% in the straight line connecting 25%, 500 nit and 100% The image can be displayed with a reduced current by setting the maximum luminance.

However, such a power consumption reduction method has advantages of simplicity, but it has disadvantages of not reflecting the contents of an image, which will be described with reference to the drawings.

FIGS. 2A and 2B are views for explaining a problem of a power consumption reduction method of a conventional organic light emitting diode display device.

As shown in FIGS. 2A and 2B, the stripe image and the landscape image have similar average image levels, but the displayed image contents are different.

That is, since the stripe image of FIG. 2A has an average image level of about 50% and the landscape image of FIG. 2B has an average image level of about 48%, the two images are about 383nit , About 369nit is set to the maximum luminance, and the image is displayed with the reduced driving current.

However, since two images having completely different contents are classified as similar and the similar value is set to the maximum luminance to reduce the luminance and the driving current, there is a problem that the display quality of at least one of the two images deteriorates.

An object of the present invention is to provide an organic light emitting diode display device and a method of driving the same that reduce power consumption without degrading display quality by reducing luminance and driving current according to the contents of an image .

According to an aspect of the present invention, there is provided a method of generating a modulated RGB signal by analyzing an RGB signal to calculate a boundary line strength for a plurality of pixels and reducing the luminance of the plurality of pixels in accordance with the boundary line strength A driving unit; And a display panel for displaying an image using the modulated RGB signal.

Here, the driving unit may include a first conversion unit for converting the RGB color space of the RGB signal into a YCbCr color space and outputting a YCbCr signal; A detector for calculating the boundary strength from the Y component of the YCbCr signal and generating a boundary line signal including information on the boundary strength; A modulator for generating a modulated YCbCr signal by reducing the Y component of the YCbCr signal according to the boundary signal; And a second conversion unit converting the YCbCr color space of the modulated YCbCr signal into the RGB color space to generate the modulated RGB signal.

The detection unit may scan the plurality of pixels with a boundary line detection mask to detect vertical boundary line strength and horizontal boundary line strength for the plurality of pixels and to calculate the boundary line intensity from the vertical boundary line intensity and the horizontal boundary line intensity can do.

The modulator may classify the boundary strength into a plurality of groups and multiply the Y component of the YCbCr signal of the plurality of pixels belonging to the plurality of groups by a plurality of gains proportional to the boundary intensity, The Y component of the YCbCr signal can be calculated.

The driving unit may further include a determination unit that calculates a color component from the YCbCr signal and determines whether the RGB signal is a monochromatic image based on the probability density function of the color component.

According to another aspect of the present invention, there is provided a method of generating a modulated RGB signal, the method comprising: analyzing an RGB signal to calculate a boundary line strength for a plurality of pixels, and reducing the luminance of the plurality of pixels according to the boundary line strength; And displaying the image by using the modulated RGB signal. The present invention also provides a method of driving an organic light emitting diode display.

The step of generating the modulated RGB signal may include converting an RGB color space of the RGB signal into a YCbCr color space and outputting a YCbCr signal; Calculating the boundary strength from the Y component of the YCbCr signal and generating a boundary line signal including information on the boundary strength; Decreasing the Y component of the YCbCr signal according to the boundary signal to generate a modulated YCbCr signal; And converting the YCbCr color space of the modulated YCbCr signal into the RGB color space to generate the modulated RGB signal.

The step of generating the boundary line signal may include detecting a vertical boundary line strength and a horizontal boundary line strength for the plurality of pixels by scanning the plurality of pixels with a boundary line detection mask and comparing the vertical boundary line intensity and the horizontal boundary line intensity And calculating the boundary strength.

The step of generating the modulated YCbCr signal may further include classifying the boundary strength into a plurality of groups and outputting a plurality of YCbCr signals, which are proportional to the boundary intensity, to the Y component of the YCbCr signal of the plurality of pixels belonging to the plurality of groups And a step of calculating the Y component of the modulated YCbCr signal by multiplying each gain by a gain.

The driving method of the organic light emitting diode display may further include a step of calculating a color component from the YCbCr signal and determining whether the RGB signal is a monochromatic image from a probability density function of the color component.

The present invention has the effect of reducing the power consumption without lowering the display quality by reducing the luminance and the driving current according to the border strength of the content of the image.

The present invention has the effect of reducing the display quality of the monochromatic image and reducing the power consumption by reducing the luminance and the driving current according to the boundary line strength for the remaining images other than the monochromatic image.

1 is a view for explaining a power consumption reduction method of a conventional organic light emitting diode display device.
2A and 2B are diagrams for explaining a problem of a power consumption reduction method of a conventional organic light emitting diode display device.
3 is a view illustrating a configuration of an organic light emitting diode display device according to a first embodiment of the present invention.
4 is a flowchart illustrating a method of driving an organic light emitting diode display according to a first embodiment of the present invention.
FIGS. 5A and 5B are diagrams for explaining boundary line detection of the organic light emitting diode display according to the first embodiment of the present invention; FIGS.
6 is a view for explaining a luminance modulation process of the organic light emitting diode display according to the first embodiment of the present invention.
7 is a view illustrating a configuration of an organic light emitting diode display device according to a second embodiment of the present invention.
8 is a flowchart illustrating a method of driving an organic light emitting diode display according to a second embodiment of the present invention.
9 is a view for explaining a monochromatic image judging process of an organic light emitting diode display device according to a second embodiment of the present invention.

Hereinafter, an organic light emitting diode display device and a driving method thereof according to the present invention will be described with reference to the accompanying drawings.

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

3, the organic light emitting diode display 100 according to the first embodiment of the present invention includes a driver 110 for outputting a modulated RGB signal, a display panel 110 for displaying an image using the modulated RGB signal, (170).

The driving unit 110 receives an RGB signal from an external system (not shown) such as a TV system or a graphic card, analyzes the RGB signal in units of frames, and reduces the luminance according to the analysis result, Thereby generating an RGB signal.

To this end, the driving unit 110 includes a first conversion unit 120 for converting the RGB color space of the RGB signal into a YCbCr color space and outputting a YCbCr signal, a YCbCr signal generation unit 120 for generating a border line signal and a YCbCr signal A modulation unit 150 for modulating the YCbCr signal according to the boundary line signal and outputting a modulated YCbCr signal, a second conversion unit 150 for converting the YCbCr color space of the modulated YCbCr signal into RGB color space and outputting the modulated RGB signal, (160).

The display panel 170 displays an image using a modulated RGB signal. To this end, the display panel 170 includes first to m-th gate lines GL1 to GLm, which define a pixel region P, The first to the n-th data lines DL1 to DLn and the first to the nth power lines PL1 to PLn and the first transistor T1 and the second transistor T2 formed in each pixel region P, A storage capacitor Cst and a light emitting diode Del.

Here, the first to the n-th data lines DL1 to DLn may be sequentially and repeatedly connected to the pixel region P that displays red, green, and blue.

The first transistor T1 is a switching element for supplying a data signal supplied through the data lines DL1 to DLn to the second transistor T2 according to a gate signal supplied through the gate lines GL1 to GLm. And the second transistor T2 supplies a power supply voltage supplied through the power lines PL1 through PLn to the light emitting diode Del in accordance with a data signal applied to the gate electrode through the first transistor. ) Device.

Accordingly, a different power supply voltage VDD depending on the data signal is supplied to the light emitting diode Del, thereby enabling various gray scales to be displayed.

The driving unit 110 may further include a timing controller for rearranging the RGB signals or the modulated RGB signals and generating a gate control signal and a data control signal. The first converter 120, the detector (not shown) 140, the modulation unit 150, and the second conversion unit 160 may be embedded in the timing control unit.

Between the driving unit 110 and the display panel 170, a gate signal is output to the first to m-th gate lines GL1 to GLm of the display panel 170 using the gate control signal output from the timing control unit A data driver for outputting the data signals to the first to the n-th data lines DL1 to DLn of the display panel 170 using the data control signals and the modulated RGB signals output from the timing controller, .

Here, the driving unit 110 converts the RGB signals of one frame into YCbCr signals, detects the boundary line from the Y component of the YCbCr signal, generates a modulated YCbCr signal by varying the amount of decrease in brightness according to the intensity of the detected boundary line , The modulated YCbCr signal is converted into the modulated RGB signal again and supplied to the display panel 170, thereby reducing the driving current and the power consumption.

The operation of the driving unit 110 will be described with reference to the drawings.

FIG. 4 is a flowchart for explaining a driving method of an organic light emitting diode display according to the first embodiment of the present invention, which will be described with reference to FIG.

As shown in FIG. 4, the driving unit 110 receives RGB signals from an external system (ST100).

The first conversion unit 120 converts the RGB color space of the RGB signal into the YCbCr color space to generate the YCbCr signal (ST110).

The boundary line is detected using the luminance component of the video signal in the subsequent step, so that the RGB color space is previously converted into the YCbCr color space which is easy to extract the Y component as the luminance component.

The detection unit 140 analyzes the Y component of the YCbCr signal to detect a boundary line, and generates a boundary line signal including information on the strength of the detected boundary line (ST120).

Specifically, the boundary line can be detected by filtering the Y component of the YCbCr signal for one frame of image using a mask for edge detection.

The boundary detection mask may be in the form of a matrix in the form of an arbitrary matrix for positioning at a certain position in the image and may be in the form of a square matrix such as 3X3, 5X5, 16X16, and a prewitt mask, a sobel mask, roberts masks, and laplacian masks.

Here, the process of detecting a boundary line is described using a Sobel mask as an example.

FIGS. 5A and 5B are diagrams for explaining boundary lines of the organic light emitting diode display according to the first embodiment of the present invention. FIG. 5A and FIG. 5B show Sobel masks for detecting the vertical component of the boundary lines and Sobel masks for detecting horizontal components of the boundary lines. It is.

As shown in FIGS. 5A and 5B, the Sobel mask has a pixel array of a 3 × 3 square matrix. For the center pixel (CP) arranged in the 2 rows and 2 columns, three pixels of the upper one row and three pixels of the lower three rows A vertical boundary line or a horizontal boundary line can be detected using the luminance component (Y) or the luminance component (Y) of three pixels of the left one column and three pixels of the right three columns.

Specifically, in FIG. 5A, the luminance components (Y) of three pixels in one row are multiplied by 1, 2, and 1, respectively, and the luminance components (Y) of the three pixels in the three rows are multiplied by -1, -2, , The vertical boundary line for the center pixel CP can be detected by adding the entire image, and the same operation can be performed while scanning the Sobel mask for all the pixels of the image.

5B, luminance components (Y) of three pixels in one column are multiplied by 1, 2, and 1, luminance components (Y) of three pixels in three columns are multiplied by -1, -2, -1, The horizontal boundary line for the center pixel CP can be detected and the same operation can be performed while scanning the Sobel mask for all the pixels of the image.

Then, the square root of the sum of the square of the intensity of the vertical boundary and the square of the intensity of the horizontal boundary can be calculated as the boundary strength of the center pixel (CP).

For example, when the difference between the luminance components of the upper and lower or left and right pixels of the center pixel CP is large, the center pixel CP has a relatively large boundary strength, and the luminance components of the upper and lower or left and right pixels of the center pixel When the difference is small, the center pixel (CP) has a relatively small border strength.

Referring again to FIG. 4, in this way, the detection unit 140 calculates a boundary line strength for all pixels of an image of one frame, and generates a boundary line signal including information on the calculated boundary line intensity.

Thereafter, the modulator 150 modulates the Y component of the YCbCr signal according to the boundary line signal to generate a modulated YCbCr signal (ST130).

Specifically, the modulator 150 can reduce the Y component of the YCbCr signal in inverse proportion to the boundary line strength.

For example, the modulator 150 may relatively reduce the amount of decrease of the Y component for a pixel having a relatively large boundary line strength and relatively increase the amount of decrease of the Y component for a pixel having a relatively small boundary line strength , It is considered that the area with a relatively large boundary line strength is more easily perceived than the area with a relatively small boundary line strength.

Here, the boundary strength is classified into a plurality of groups, and the Y component of the YCbCr signal can be modulated by multiplying the gains by different groups, which will be described with reference to the drawings.

FIG. 6 is a view for explaining the luminance modulation process of the organic light emitting diode display according to the first embodiment of the present invention, and shows the gain when the boundary line intensities are classified into three groups.

As shown in Fig. 6, after the boundary line strength is calculated by filtering using the boundary line detection mask, the entire boundary line intensity can be classified into three groups.

That is, the boundary strength 0 to 2 may be divided into a first group, the boundary strength 3 to 7 to a second group, and the boundary strength 8 to 10 to a third group. The first, second and third groups may be divided into first, Second, and third boundary line intensities I1, I2, I3.

Here, the second boundary line intensity I2 is smaller than the third boundary line intensity I3 and larger than the first boundary line intensity I1. (I1 < I2 < I3)

At this time, the Y component of the YCbCr signal of the pixel belonging to the first group is multiplied by the first gain G1 to calculate the Y component of the modulation YCbCr, and the Y component of the YCbCr signal of the pixel belonging to the second group is multiplied by the second gain G2 ) To calculate the Y component of the modulated YCbCr, and the Y component of the modulated YCbCr is calculated by multiplying the Y component of the YCbCr signal of the pixel belonging to the third group by the third gain G3. (Y component of the modulated YCbCr signal = gain X (Y component of the YCbCr signal)

Here, the second gain G2 is smaller than the third gain G3 and larger than the first gain G1. (G1 < G2 < G3)

That is, the Y component of the modulated YCbCr signal can be calculated by multiplying the Y component of the YCbCr signal by a gain proportional to the boundary line strength. As a result, the difference between the Y component of the modulated YCbCr signal and the Y component of the YCbCr signal Reduction amount) is inversely proportional to the boundary strength.

This driving method minimizes the luminance reduction amount in the area corresponding to the clear boundary of the image of one frame and prevents the deterioration of the display quality and maximizes the luminance reduction amount for the flat area rather than the boundary among the one frame image, By reducing the power, the driving current and the power consumption can be reduced without deteriorating the display quality according to the content of the image.

In the first embodiment, the boundary line strengths are classified into three groups and the gains according to the three groups are explained. However, in another embodiment, the number of classification groups of boundary line strengths can be changed variously. The number and size of gains can be varied to the extent that the principle of proportionality is maintained.

Referring again to FIG. 4, in this way, the modulator 150 modulates the Y component of the YCbCr signal according to the boundary signal to generate a modulated YCbCr signal.

Thereafter, the second converter 160 converts the YCbCr color space of the modulated YCbCr signal into RGB color space to generate a modulated RGB signal (ST140), and the driving unit 110 outputs the modulated RGB signal to the display panel 170 (ST150).

As described above, in the organic light emitting diode display device and the driving method thereof according to the first embodiment of the present invention, the image quality of the one frame is analyzed to calculate the boundary line strength, and the luminance reduction amount is varied according to the boundary line strength, The driving current and the power consumption can be reduced.

On the other hand, in the case of a monochromatic image without a border line, deterioration of display quality may occur when the luminance is decreased according to the border strength. A configuration for preventing the display quality will be described with reference to the drawings.

FIG. 7 is a diagram illustrating a configuration of an organic light emitting diode display according to a second embodiment of the present invention. FIG. 8 is a flowchart illustrating a method of driving an organic light emitting diode display according to a second embodiment of the present invention. The description of the same portions as those of the first embodiment will be omitted.

7, the organic light emitting diode display 200 according to the second embodiment of the present invention includes a driving unit 210 for outputting a modulated RGB signal and a display unit 210 for displaying an image using the modulated RGB signal. (Not shown).

The driving unit 210 receives RGB signals from an external system (not shown) such as a TV system or a graphics card, analyzes the RGB signals in units of frames, reduces the luminance according to the analysis result, .

The driving unit 210 includes a first conversion unit 220 for converting the RGB color space of the RGB signals into a YCbCr color space and outputting a YCbCr signal, a determination unit 230 for determining whether the YCbCr signal is a monochromatic image, A modulator 250 for modulating the YCbCr signal according to the boundary signal and outputting a modulated YCbCr signal, and a modulator 250 for modulating the YCbCr signal in the YCbCr signal, And a second conversion unit 260 for converting the RGB color space into an RGB color space and outputting a modulated RGB signal.

Although not shown, the driving unit 210 may further include a timing controller for rearranging the RGB signals or the modulated RGB signals and generating gate control signals and data control signals. The first converter 220, the determining unit 230 ), The detecting unit 240, the modulating unit 250, and the second converting unit 260 may be embedded in the timing control unit.

The driving unit 210 converts the RGB signal of one frame into the YCbCr signal, and then analyzes the YCbCr signal to determine whether the corresponding image is a monochromatic image, detect a boundary line from the Y component of the YCbCr signal, The modulation YCbCr signal is converted into a modulated RGB signal and supplied to the display panel 270 to reduce the driving current and the power consumption.

As shown in FIG. 8, the driving unit 210 receives RGB signals from an external system (ST200).

The first conversion unit 220 converts the RGB color space of the RGB signal into the YCbCr color space to generate the YCbCr signal (ST210).

The boundary line is detected using the luminance component of the video signal in the subsequent step, so that the RGB color space is previously converted into the YCbCr color space which is easy to extract the Y component as the luminance component.

The determination unit 230 analyzes the YCbCr signal to determine whether it is a monochromatic image (ST220). If the monochromatic image is a monochromatic image, the YCbCr color space of the YCbCr signal is converted to RGB Color space. If the image is not a monochromatic image, the boundary detection and the Y-component modulation of the YCbCr signal proceed.

Here, the hue component may be calculated using the Cb component and the Cr component of the YCbCr signal, and it may be determined whether the monochromatic image is obtained from the color component, which will be described with reference to the drawings.

9 is a diagram for explaining a monochrome image judging process of the organic light emitting diode display device according to the second embodiment of the present invention.

As shown in FIG. 9, when the image of one frame is a monochromatic image, the probability density function (PDF) of the color component of the image has a bin interval of 1.

The hue component can be calculated from the arctangent value of the ratio of the Cr component to the Cb component (hue = arctan (Cr / Cb)), and a color component having a value in the range of 0 to 360 degrees is divided into a plurality of colors A color component is calculated for all the pixels of the corresponding image, and then a histogram of a plurality of color groups is generated to calculate a probability density function graph for a plurality of color groups.

In the case of a monochromatic image, since all the pixels belong to the same color group, the frequency of the corresponding color group is 1 and the frequency of the remaining color groups is 0. [

Therefore, the determination unit 230 calculates the probability density function for the color component and the color group using the Cb component and the Cr component of the YCbCr signal, and if the interval has a frequency of 1, If there is no interval, it can be determined that the image is not a monochromatic image.

Referring to FIG. 8 again, the detector 240 analyzes the Y component of the YCbCr signal to detect a boundary line, and generates a boundary line signal including information on the intensity of the detected boundary line (ST230).

Specifically, the boundary line can be detected by filtering the Y component of the YCbCr signal for one frame of image using a mask for edge detection.

The boundary detection mask may be in the form of a matrix in the form of an arbitrary matrix for positioning at a certain position in the image and may be in the form of a square matrix such as 3X3, 5X5, 16X16, and a prewitt mask, a sobel mask, roberts masks, and laplacian masks.

In this way, the detection unit 240 calculates the boundary line strength for all the pixels of the image of one frame, and generates the boundary line signal including information on the calculated boundary line intensity.

Then, the modulator 250 modulates the Y component of the YCbCr signal according to the boundary signal to generate a modulated YCbCr signal (ST240).

Specifically, the modulator 250 can reduce the Y component of the YCbCr signal in inverse proportion to the boundary line strength.

For example, the modulator 250 may relatively reduce the amount of decrease in the Y component for a pixel having a relatively large boundary line strength and relatively increase the amount of a reduced Y component for a pixel having a relatively small boundary line strength , It is considered that the area with a relatively large boundary line strength is more easily perceived than the area with a relatively small boundary line strength.

This driving method minimizes the luminance reduction amount in the area corresponding to the clear boundary of the image of one frame and prevents the deterioration of the display quality and maximizes the luminance reduction amount for the flat area rather than the boundary among the one frame image, By reducing the power, the driving current and the power consumption can be reduced without deteriorating the display quality according to the content of the image.

Thereafter, the second conversion unit 260 converts the YCbCr color space of the modulated YCbCr signal (including the unmodulated YCbCr signal of the monochromatic image) into RGB color space to generate a modulated RGB signal (ST250), and the driving unit 210 And outputs the modulated RGB signal to the display panel 270 (ST260).

As described above, in the organic light emitting diode display device and the driving method thereof according to the second embodiment of the present invention, the image of one frame is analyzed to determine whether the image is a monochromatic image. In the case of a monochromatic image, In the case where the image is not a monochromatic image, the intensity of the boundary line is calculated and the luminance reduction amount is varied according to the intensity of the boundary line, thereby preventing display quality deterioration and reducing the driving current and power consumption.

For example, when the image signal is modulated by varying the luminance reduction amount according to the border strength of the image of one frame, the consumption current can be reduced by about 17.57% while the display quality of the image is kept substantially the same.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

100, 200: organic light emitting diode display device
110, 210: Driving unit 120, 220:
230: determination unit 140, 240: detection unit
150, 250: Modulation unit 160, 260: Second conversion unit
170, 270: display panel

Claims (10)

A driver for calculating a boundary line strength for a plurality of pixels by analyzing the RGB signals and generating a modulated RGB signal by differentially reducing the brightness of the plurality of pixels according to the boundary line strength;
A display panel for displaying an image using the modulated RGB signal;
And an organic light emitting diode (OLED) display device.
The method according to claim 1,
The driving unit includes:
A first conversion unit for converting the RGB color space of the RGB signal into a YCbCr color space and outputting a YCbCr signal;
A detector for calculating the boundary strength from the Y component of the YCbCr signal and generating a boundary line signal including information on the boundary strength;
A modulator for generating a modulated YCbCr signal by reducing the Y component of the YCbCr signal according to the boundary signal;
A second conversion unit for converting the YCbCr color space of the modulated YCbCr signal into the RGB color space and generating the modulated RGB signal,
And an organic light emitting diode (OLED) display device.
3. The method of claim 2,
Wherein the detection unit detects the vertical boundary strength and the horizontal boundary strength for the plurality of pixels by scanning the plurality of pixels with the boundary detection mask and calculates the boundary strength from the vertical boundary strength and the horizontal boundary strength Light emitting diode display.
3. The method of claim 2,
Wherein the modulation section classifies the boundary line intensities into a plurality of groups and multiplies the Y component of the YCbCr signal of the plurality of pixels belonging to the plurality of groups by a plurality of gains proportional to the boundary intensity, The Y component of the organic light emitting diode.
3. The method of claim 2,
The driving unit includes:
A determination unit for determining a monochromatic image of the RGB signal from the probability density function of the color component, calculating a color component from the YCbCr signal,
And an organic light emitting diode (OLED) display device.
Analyzing the RGB signals to calculate boundary line intensities for a plurality of pixels and differentially reducing the luminance of the plurality of pixels according to the boundary line intensities to generate a modulated RGB signal;
Displaying the image using the modulated RGB signal
And a driving method of the organic light emitting diode display device.
The method according to claim 6,
Wherein the step of generating the modulated RGB signal comprises:
Converting an RGB color space of the RGB signal into a YCbCr color space and outputting a YCbCr signal;
Calculating the boundary strength from the Y component of the YCbCr signal and generating a boundary line signal including information on the boundary strength;
Decreasing the Y component of the YCbCr signal according to the boundary signal to generate a modulated YCbCr signal;
Converting the YCbCr color space of the modulated YCbCr signal into the RGB color space to generate the modulated RGB signal
And a driving method of the organic light emitting diode display device.
8. The method of claim 7,
The step of generating the boundary line signal comprises:
Scanning the plurality of pixels with a mask for detecting a boundary to detect vertical boundary strength and horizontal boundary strength for the plurality of pixels and calculating the boundary strength from the vertical boundary strength and the horizontal boundary strength, A method of driving a light emitting diode display device.
8. The method of claim 7,
The step of generating the modulated YCbCr signal comprises:
Dividing the boundary intensity into a plurality of groups and multiplying the Y component of the YCbCr signal of the plurality of pixels belonging to the plurality of groups by a plurality of gains proportional to the boundary intensity respectively to calculate the Y component of the modulated YCbCr signal Of the organic light emitting diode display device.
8. The method of claim 7,
Calculating a color component from the YCbCr signal and determining whether the RGB signal is a monochromatic image from a probability density function of the color component.

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