KR20110135085A - Method of controlling picture quality and display device using the same - Google Patents

Abstract

PURPOSE: A screen quality controlling method and display device using the same are provided to reduce color difference and to naturally express the color of the skin by improving contrast and clearness based on the gray level of a perimeter pixel. CONSTITUTION: A blur processor(151) blurs the pixel data of horizontal lines. A compression processor(152) compresses pixel data which are blur. A data stretching processor(153) modulates maximum pixel data having maximum gradation value and modulates minimum pixel data having first minimum gradation value. The data stretching processor modulates pixel data having a middle e gradation pixel into a middle gradation modification value.

Description

Quality control method and display device using the same {METHOD OF CONTROLLING PICTURE QUALITY AND DISPLAY DEVICE USING THE SAME}

The present invention relates to a quality control method and a display device using the same.

The liquid crystal display of the active matrix driving method displays a moving image using a thin film transistor (hereinafter referred to as TFT) as a switching element. The liquid crystal display device can be miniaturized compared to a cathode ray tube (CRT), which is applied to a display device in a portable information device, an office device, a computer, and a television, and is rapidly replacing a cathode ray tube.

As a method for improving contrast in a liquid crystal display, the gray level distribution of the input RGB data is analyzed by a histogram, the histogram is expressed by a cumulative density function, and then the cumulative distribution function is expressed as a data. Modulation using a stretching function is known. However, this method modulates the gray scale by analyzing the gray scale distribution of the entire RGB data without considering the gray scale of neighboring pixels, so that heterogeneity is likely to occur when compared with the original image. In particular, this method has a problem that the skin color becomes unnatural when expressing the skin color that can easily feel the color heterogeneity.

In addition, this method requires storing all the pixel data values of one frame period, thereby increasing the hardware load. Furthermore, this method is a method of increasing the contrast, and there is a problem that the hardware load is increased because the process of improving the sharpness must be driven separately in order to improve the sharpness together.

The present invention provides a method for controlling image quality and a display device using the same that can further improve contrast and sharpness without increasing cost.

The image quality control method of the present invention is a display panel including a plurality of pixels for displaying two-dimensional and three-dimensional images, the Nth horizontal to blur the outline of the image for every Nth (N is a natural number) horizontal line Blueing the pixel data of the line; Compressing the blue processed pixel data; And up-modulating the maximum pixel data having the first maximum grayscale value of the compressed grayscale range among the pixel data having the grayscale value within the compressed grayscale range by the compression process to a second maximum grayscale value outside the compressed grayscale range, And down-modulate the minimum pixel data having the first minimum grayscale value within the compressed grayscale range to a second minimum grayscale value outside the compressed grayscale range, and having an intermediate grayscale value between the first maximum grayscale value and the first minimum grayscale value. Modulating any pixel data with a half-tone modulation value t, wherein the difference between the arbitrary pixel data and the first maximum gray value is a, and When the difference b, the second maximum gray value is Gmax and the second minimum gray value is Gmin, the intermediate gray scale modulation value t satisfies a: b = Gmax-t: t-Gmin. It shall be.

A display device using the image quality control method of the present invention includes a display panel including a plurality of pixels for displaying two-dimensional and three-dimensional images; A blueer processor blueing the pixel data of the Nth horizontal line to blur the outline of the image at every Nth (N is a natural number) horizontal line; A compression processor to compress the blue processed pixel data; And, by the compression processor, up-modulating the maximum pixel data having the first maximum grayscale value of the compressed grayscale range among the pixel data having the grayscale value within the compressed grayscale range to a second maximum grayscale value outside the compressed grayscale range, And down-modulate the minimum pixel data having the first minimum grayscale value within the compressed grayscale range to a second minimum grayscale value outside the compressed grayscale range, and having an intermediate grayscale value between the first maximum grayscale value and the first minimum grayscale value. And a data stretching processor configured to modulate arbitrary pixel data into a half-tone modulation value t, wherein the difference between the arbitrary pixel data and the first maximum gray value is a, and the arbitrary pixel data and the first minimum gray value are included. When the difference between b, the second maximum gray value is Gmax and the second minimum gray value is Gmin, the intermediate gray level modulation value t is a: b = Gmax-t: t-Gmin. Characterized by satisfying.

The present invention improves contrast and sharpness by reflecting grayscale values of surrounding pixels. As a result, the present invention can reduce the color heterogeneity when compared with the original image, and can also naturally express the skin color.

Furthermore, the present invention can reduce hardware load by implementing contrast and sharpness enhancement in one process.

1 is a flowchart illustrating a quality control method according to an exemplary embodiment of the present invention.
2 is a diagram illustrating pixel arrangement of a display panel having 1920 × 1080 resolution.
3 is a graph showing that pixel data of an Nth horizontal line is blue-processed.
4 and 5 are diagrams illustrating a blueer processing method using a mask.
FIG. 6 is a graph showing that pixel data of a bluened Nth horizontal line is compressed.
7 is a graph illustrating data stretching of pixel data of a compressed N-th horizontal line.
8 is an original image image used in the experiment of the present invention.
9 is an experimental result image modulated by the image quality control method of the present invention.
FIG. 10 is a diagram illustrating a first embodiment of modulating pixel data of an Nth horizontal line compressed in FIG. 7.
FIG. 11 is a diagram illustrating a second embodiment of modulating pixel data of an N-th horizontal line compressed in FIG. 7.
12 is a block diagram of a display device using a quality control method according to an exemplary embodiment of the present invention.
FIG. 13 is a detailed block diagram illustrating an image quality improvement unit of FIG. 12.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like numbers refer to like elements throughout. In the following description, when it is determined that a detailed description of known functions or configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Component names used in the following description may be selected in consideration of ease of specification, and may be different from actual product part names.

1 is a flowchart illustrating a quality control method according to an exemplary embodiment of the present invention. This will be described with reference to the drawings of FIGS. 2 to 11.

Referring to FIG. 1, the image quality control method of the present invention first determines whether RGB data of an Nth (N is a natural number) horizontal line is input. 2 is a diagram illustrating pixel arrangement of a display panel having 1920 × 1080 resolution. Referring to FIG. 2, the display panel includes 1920 vertical lines and 1080 horizontal lines in the case of 1920 × 1080 resolution.

In the case of '1920 × 1080 resolution', each Nth horizontal line includes 1080 pixels. In FIG. 2, the first horizontal line includes pixels of P (1,1) to P (1,1080), and the second horizontal line includes pixels of P (2,1) to P (2,1080). . When RGB data is input to the Nth horizontal line, pixel data is input to each of the 1080 pixels. The pixel data means a gray level value of the pixel, and the gray level value of the pixel may be expressed as a function value of luminance information Y including R data, G data, and B data as variables. (S101)

The pixel data input to each of the pixels of the Nth horizontal line is processed by Blur, that is, the outline of the image is blurred. 3 is a graph showing that pixel data of an Nth horizontal line is blue-processed. In FIG. 3, the x-axis represents the position of each pixel of the N-th horizontal line, and in the case of '1920 × 1080 resolution', represents the position of the first to 1080 pixels. The y-axis represents the gray value of the pixel.

Referring to FIG. 3, the blue L-treated graph L2 has a gentler bending point than the graph L1 before blue blue processing. This means that the image of the graph L2 processed blue is blurred than the original image. This blueer process uses a mask that functions as a filter.

The mask weights peripheral pixel data of the M-th (M is a natural number) pixel data and the M-th pixel data existing within a predetermined size for the blueer processing, and the weight adds the sum of the M-th pixel data and the peripheral pixel data. Is calculated to define an equation for modulating the M-th pixel data. The mask may be formed to have a 3 × 3 or 5 × 3 pixel size or the like to reflect the grayscale value of the surrounding pixels. The larger the size of the mask, the higher the sharpness, but the disadvantage is that the calculation formula is complicated.

As shown in FIG. 2, the mask is shifted by one pixel data unit along the x-axis direction. Therefore, after the Mth pixel data is blueened by the mask, the M + 1th pixel data is blueed by the mask.

4 and 5 are diagrams illustrating a blueer processing method using a mask. 4 and 5 represent a mask of 3x3 pixel size. Masks of 3x3 pixel size are represented by 3x3 matrices, which are (i-1, j-1), (i, j-1), (i + 1, j-1), (i-1, j), (i, j), (i + 1, j), (i-1, j + 1), (i, j + 1), and (i + 1, j + 1) It is expressed as Where i is the horizontal position value of the matrix and j is the vertical position value of the matrix.

4 shows that the twelfth pixel is blueered. In this case, the twelfth pixel becomes the reference position (i, j), thereby determining the position of the neighboring pixels to be multiplied by the weight of the mask. In this case, the sixth pixel (i-1, j-1), the seventh pixel (i, j-1), the eighth pixel (i + 1, j-1), the eleventh pixel (i-1, j) , The twelfth pixel (i, j), the thirteenth pixel (i + 1, j), the sixteenth pixel (i-1, j + 1), the seventeenth pixel (i, j + 1), and the eighteenth pixel ( i + 1, j + 1) is multiplied by the weight of the mask. The equation of pixel data to be processed blue is expressed by matrix operation as shown in Equation (1).

In Equation 1, NP (i, j) denotes pixel data processed blue, p (i, j) denotes pixel data at position (i, j), and m (i, j) denotes (i, j ) Means the mask weight of the position. In FIG. 3, a mask having a weight of 1 was used. The operation of Equation 1 may be performed in a logic circuit including an adder and a multiplier.

5 shows that the thirteenth pixel is blueered. Since the mask is shifted by one pixel data unit along the x-axis direction as shown in FIG. 2, after the twelfth pixel is blueened, the thirteenth pixel is bluened. In this case, the thirteenth pixel becomes the reference position (i, j), and thus the position of neighboring pixels to be multiplied by the weight of the mask is determined. Therefore, the seventh pixel (i-1, j-1), the eighth pixel (i, j-1), the ninth pixel (i + 1, j-1), the twelfth pixel (i-1, j), The thirteenth pixel (i, j), the fourteenth pixel (i + 1, j), the seventeenth pixel (i-1, j + 1), the eighteenth pixel (i, j + 1), and the nineteenth pixel (i) + 1, j + 1) is multiplied by the weight of the mask. The equation of pixel data to be processed blue is expressed by matrix operation as shown in Equation (1). (S102)

The pixel data of the bluened Nth horizontal line is compressed. FIG. 6 is a graph showing that pixel data of a bluened Nth horizontal line is compressed. In FIG. 6, the x-axis indicates pixel positions of the N-th horizontal line, and in the case of '1920 × 1080 resolution', indicates the positions of the first to 1080 pixels. The y-axis represents the gray value of the pixel. Referring to FIG. 6, the compressed graph L3 is compressed with a smaller gray scale value than the bluened graph L2.

In order to compress the pixel data, the pixel data of the bluened Nth horizontal line is divided by a predetermined scale factor. The scale factor is a value that affects the contrast improvement. The larger the scale factor is greater than 1, the more the pixel data of the Nth horizontal line is compressed. The smaller the scale factor is, the smaller the value is, the smaller the pixel of the Nth horizontal line. Since the data are not compressed, the effect of contrast improvement is negligible. (S103)

The pixel data of the compressed Nth horizontal line is data stretched to improve contrast and sharpness. 7 is a graph illustrating data stretching of pixel data of a compressed N-th horizontal line. In FIG. 7, the x-axis represents pixel positions of the N-th horizontal line, and in the case of '1920 × 1080 resolution', represents the positions of the first to 1080 pixels. The y-axis represents the gray value of the pixel.

Referring to FIG. 7, the data stretched graph L4 has a lower minimum value and a larger maximum value than the compressed graph L3. In addition, the data stretched graph L4 has a smaller minimum value and a larger maximum value than the original RGB data graph L1 before the blue processing. As shown in FIG. 7, it can be seen that the difference in the gray scale values becomes clearer through the image quality control method of the present invention, and the contrast is improved.

8 is an original image image used in the experiment of the present invention, Figure 9 is an experimental result image modulated by the image quality control method of the present invention. Compared to the original image of FIG. 8, the sharpness of the modulated image of FIG. 8 is improved, so that each pine needle is clearly visible. As a result, as can be seen in Figures 8 and 9 it can be seen that the sharpness is improved through the image quality control method of the present invention.

In order to improve contrast and clarity as described above, a method of stretching the pixel data of the compressed Nth horizontal line will be described in detail with reference to FIGS. 10 and 11.

FIG. 10 is a diagram illustrating a first embodiment of modulating pixel data of an Nth horizontal line compressed in FIG. 7. Referring to FIG. 10, the maximum pixel data among the pixel data of the compressed Nth horizontal line is set to a maximum standard value, and the minimum pixel data is set to a minimum standard value. The maximum standard value (Max Standard) is modulated to the maximum representable value and the minimum standard (Min Standard) is modulated to the minimum representable value. The maximum representable value is determined by the number of bits of the pixel data. For 8-bit pixel data, the maximum representable value is G255 gradation, and the minimum representable value is G0 gradation.

Any pixel data in the intermediate range lower than the maximum pixel data and higher than the minimum pixel data among the pixel data of the compressed Nth horizontal line is modulated through Equations 2 and 3.

In Equations 2 and 3, a is the difference between the arbitrary pixel data and the reference maximum value (Max Standard), b is the difference between the arbitrary pixel data and the reference minimum value (Min Standard), and t is the gradation modulation of the arbitrary pixel data. It means the value. Equations 2 and 3 are formulas for obtaining arbitrary pixel data t when the number of bits of the pixel data is 8 bits.

Equation 2 is a ratio of the difference (a) between the arbitrary pixel data and the maximum standard (Max Standard) and the difference (b) between the arbitrary pixel data and the minimum standard (Min Standard), the 'G255 gray scale and The difference between the gradation modulation value of the arbitrary pixel data (255-t) 'and the difference between the gradation modulation value of the arbitrary pixel data and the G0 gradation difference t' is equal to the ratio. Equation 3 is an equation obtained by arranging Equation 2 into modulated pixel data t.

FIG. 11 is a diagram illustrating a second embodiment of modulating pixel data of an N-th horizontal line compressed in FIG. 7. Referring to FIG. 11, the maximum pixel data among the pixel data of the compressed Nth horizontal line is set to a maximum standard value, and the minimum pixel data is set to a minimum standard value. The maximum standard value is modulated to a specific maximum gray value which is larger than the maximum standard value and smaller than the maximum representable value (255 when the pixel data is 8 bits) and the minimum standard value (Min Standard). Is modulated to a specific minimum gray value (MinValue) that is less than the minimum standard and larger than the minimum representable value (0 if the pixel data is 8 bits). Any pixel data in the middle range lower than the maximum pixel data and higher than the minimum pixel data among the pixel data of the compressed Nth horizontal line is modulated through Equations 4 and 5.

In equations (4) and (5), a is the difference between any pixel data and the reference maximum value (Max Standard), b is the difference between any pixel data and the reference minimum value (Min Standard), and t is gray scale modulation of any pixel data. It means the value.

Equation 4 is the ratio of the difference (a) between the arbitrary pixel data and the maximum standard (Max Standard) and the difference (b) between the gray scale modulation value and the minimum standard (Min) of the arbitrary pixel data is' 'Difference between the maximum maximum gray scale value (MaxValue) and the gray scale modulation value of arbitrary pixel data (MaxValue-t)' and 'Difference between the gray scale modulation value of the arbitrary pixel data and the minimum minimum gray scale value (Min-Value)' Is equal to the ratio of. Equation 5 is an equation obtained by arranging Equation 4 into modulated pixel data t. (S104, S105)

12 is a block diagram of a display device according to an exemplary embodiment of the present invention. The display panel 10 of the display device of the present invention is a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an organic light emitting diode device It may be implemented as a flat panel display device such as an organic light emitting diode (OLED). Although the present invention has been exemplified by the liquid crystal display device in the following embodiment, it should be noted that the present invention is not limited to the liquid crystal display device.

The display device of the present invention can implement two-dimensional and three-dimensional images. A stereoscopic image display device for implementing a 3D image is divided into a binocular parallax technique and an autostereoscopic technique. The binocular parallax method uses a parallax image of the left and right eyes with a large stereoscopic effect, and there are glasses and no glasses, both of which are put to practical use. The spectacle method displays the polarization of the left and right parallax images on the direct-view display device or the projector in a manner of changing the polarization of the left and right parallax images, and implements a stereoscopic image using polarized glasses or liquid crystal shutter glasses. The glasses-free method generally includes a parallax barrier method and a lenticular method. Although the present invention exemplifies a method of implementing a 3D image around the liquid crystal shutter glasses in the following embodiment, it should be noted that the present invention is not limited to the liquid crystal shutter glasses.

Referring to FIG. 12, the liquid crystal display device of the present invention includes a display panel 10, a liquid crystal shutter glasses 20, a display panel driver 110, a liquid crystal shutter glasses control signal receiver 120, and a liquid crystal shutter glasses control signal transmitter ( 130, a timing controller 140, an image quality improving unit 150, and a system board 160.

The display panel 10 alternately displays left eye image data RGB _L and right eye image data RGB _R under the control of the timing controller 140. The display panel 10 may display two-dimensional image data RGB without distinguishing between the left eye image and the right eye image under the control of the timing controller 140. The display panel 10 may be selected as a hold type display device requiring a backlight unit. As the hold type display device, a transmissive liquid crystal display panel that modulates light from the backlight unit 20 may be selected.

The transmissive liquid crystal display panel includes a thin film transistor (TFT) substrate and a color filter substrate. A liquid crystal layer is formed between the TFT substrate and the color filter substrate. On the TFT substrate, the data lines and the gate lines (or scan lines) are formed to cross each other on the lower glass substrate, and the liquid crystal cells are arranged in a matrix form in the cell regions defined by the data lines and the gate lines. do. The TFT formed at the intersection of the data lines and the gate lines transfers the data voltage supplied through the data lines to the pixel electrode of the liquid crystal cell in response to the scan pulse from the gate line. For this purpose, the gate electrode of the TFT is connected to the gate line, and the source electrode is connected to the data line. The drain electrode of the TFT is connected to the pixel electrode of the liquid crystal cell. The common voltage is supplied to the common electrode facing the pixel electrode. The color filter substrate includes a black matrix and a color filter formed on the upper glass substrate. The common electrode is formed on the upper glass substrate in a vertical electric field driving method such as twisted nematic (TN) mode and vertical alignment (VA) mode, and a horizontal electric field such as IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode. The driving method is formed on the lower glass substrate together with the pixel electrode. A polarizing plate is attached to each of the upper glass substrate and the lower glass substrate of the transmissive liquid crystal display panel, and an alignment layer for setting the pre-tilt angle of the liquid crystal is formed. A spacer for maintaining a cell gap of the liquid crystal layer is formed between the upper glass substrate and the lower glass substrate of the transmissive liquid crystal display panel. The liquid crystal mode of the transmissive liquid crystal display panel may be implemented in any liquid crystal mode as well as the above-described TN mode, VA mode, IPS mode, FFS mode.

The display panel driver 110 includes a data driver circuit and a gate driver circuit. The data driving circuit converts the data (RGB _L , RGB _R ) of the left eye image and the right eye image input from the timing controller 150 into the positive / negative gamma compensation voltage in the 3D image to convert the positive / negative analog data. Generate voltages. Positive / negative analog data voltages output from the data driving circuit are supplied to the data lines of the display panel 10. The gate driving circuit sequentially supplies gate pulses (or scan pulses) synchronized with data voltages to gate lines of the display panel 10.

The liquid crystal shutter glasses 20 includes a left eye shutter ST _L and a right eye shutter ST _R that are electrically controlled separately. Each of the left eye shutter ST _L and the right eye shutter ST _R includes a first transparent substrate, a first transparent electrode formed on the first transparent substrate, a second transparent substrate, a second transparent electrode formed on the second transparent substrate, and And a liquid crystal layer sandwiched on the first and second transparent substrates. The reference voltage is supplied to the first transparent electrode and the ON / OFF voltage is supplied to the second transparent electrode. Each of the left eye shutter ST _L and the right eye shutter ST _R transmits light from the display panel 10 when the ON voltage is supplied to the second transparent electrode, while the OFF eye is supplied to the second transparent electrode. Light from the display panel 10 is blocked.

The liquid crystal shutter eyeglasses control signal transmitter 130 is connected to the timing controller 140 and receives the liquid crystal shutter eyeglasses control signal C _ST input from the timing controller 140 through a wired / wireless interface. To be sent). The liquid crystal shutter glasses control signal receiver 120 is installed in the liquid crystal shutter glasses 20 to receive the liquid crystal shutter control signal C _ST through a wired / wireless interface, and the liquid crystal shutter glasses according to the liquid crystal shutter control signal C _ST . The left eye shutter ST _L and the right eye shutter ST _R of 20 are alternately opened and closed.

When the liquid crystal shutter control signal C _ST is input to the liquid crystal shutter control signal receiver 120 as the first logic value, the ON voltage is supplied to the second transparent electrode of the left eye shutter ST _L while the right eye shutter ST is supplied. _The OFF voltage is supplied to the second transparent electrode of _R ). When the liquid crystal shutter control signal C _ST is input to the liquid crystal shutter control signal receiver 120 as the second logic value, the OFF voltage is supplied to the second transparent electrode of the left eye shutter ST _L while the right eye shutter ST is supplied. _The ON voltage is supplied to the second transparent electrode of _R ). Therefore, the left eye shutter ST _L of the liquid crystal shutter glasses 20 is opened when the liquid crystal shutter control signal C _ST is generated as the first logical value, and the right eye shutter ST _R of the liquid crystal shutter glasses 20 is It is opened when the liquid crystal shutter control signal C _ST is generated as the second logic value. The first logic value may be set to a high logic voltage, and the second logic value may be set to a high logic voltage.

The display panel control signal C _DIS includes a data control signal for controlling the operation timing of the data driving circuit and a gate control signal for controlling the operation timing of the gate driving circuit. The data control signal includes a source start pulse SSP, a source sampling clock SSC, a source output enable signal SOE, a polarity control signal POL, and the like. The source start pulse SSP controls the data sampling start time of the data driving circuit. The source sampling clock is a clock signal that controls the sampling operation of the data driving circuit based on the rising or falling edge. If the digital video data to be input to the data driving circuit is transmitted in mini LVDS (Low Voltage Differential Signaling) interface standard, the source start pulse SSP and the source sampling clock SSC may be omitted. The polarity control signal POL inverts the polarity of the data voltage output from the data driving circuit in a period of L (L is a positive integer) horizontal period. The source output enable signal SOE controls the output timing of the data driver circuit.

The gate control signal includes a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (Gate Output Enable, GOE), and the like. The gate start pulse GSP controls the timing of the first gate pulse. The gate shift clock GSC is a clock signal for shifting the gate start pulse GSP. The gate output enable signal GOE controls the output timing of the gate driving circuit.

The timing controller 140 may include a frame counter, a line counter, a memory, and the like. The frame counter generates a frame count signal by counting a signal in which a pulse is generated once in one frame period (one vertical period) such as the vertical synchronization signal Vsync or the gate start pulse GSP. The line counter generates a line count signal by counting a signal in which a pulse is generated once in one horizontal period, such as a horizontal synchronization signal Hsync or a data enable signal DE.

The timing controller 140 may determine the liquid crystal shutter glasses control signal C _ST through the frame counter signal and the line counter signal. The timing controller 140 outputs the liquid crystal shutter glasses control signal C _ST to the liquid crystal shutter glasses control signal transmitter 130. The liquid crystal shutter glasses control signal C _ST is transmitted to the liquid crystal shutter glasses control signal receiver 120 to alternately open and close the left eye shutter ST _L and the right eye shutter ST _{R of the} liquid crystal shutter glasses 20.

The image quality improving unit 150 receives RGB data RGB from the system board 160 and outputs RGB data RGB 'having improved contrast and sharpness of the RGB data RGB. The image quality improving unit 150 may be located between the system board 160 and the timing controller 140 as shown in FIG. 12 or may be embedded in the timing controller 140. A detailed description of the image quality improving unit 150 will be described later with reference to FIG. 13.

The system board 160 converts the resolution of the image data RGB input from the outside to match the resolution of the display panel 10 and converts various timing signals (Vsync, Hsync, DE, CLK, etc.) into the timing controller 140. To transmit.

13 is a block diagram illustrating in detail the image quality improvement unit 150 of FIG. 12. The image quality improving unit 150 includes a blueer processing unit 151, a compression processing unit 152, and a data stretching processing unit 153.

The blueer processor 151 performs a blueer on the pixel data input to each of the pixels of the Nth horizontal line. The blueer treatment method has been described above with reference to FIGS. 3 to 5.

The compression processor 152 receives the blue data processed pixel data of the N-th horizontal line, which is blue, and compresses the blue data processed pixel data of the N-th horizontal line. The compression processing method has already been described above with reference to FIG. 6.

The data stretching processor 153 receives the compressed pixel data of the N-th horizontal line from the compression processor 152 and stretches the compressed pixel data of the N-th horizontal line. The data stretching method has been described above with reference to FIGS. 7 to 11.

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. Therefore, the present invention should not be limited to the details described in the detailed description, but should be defined by the claims.

10: display panel 20: liquid crystal shutter glasses
110: display panel driver 120: liquid crystal shutter glasses receiver
130: liquid crystal shutter glasses transmitter 140: timing controller
150: image quality improving unit 151: blueer processing unit
152: compression processing unit 153: data stretching processing unit
160: system board

Claims (8)

In a display panel including a plurality of pixels for displaying two-dimensional and three-dimensional images,
Blueing the pixel data of the Nth horizontal line to blur the outline of the image for every Nth (N is a natural number) horizontal line;
Compressing the blue processed pixel data; And
The maximum pixel data having a first maximum gray value of the compressed gray scale range among the pixel data having a gray scale value within the compressed gray scale range is modulated upward by a compression process to a second maximum gray value outside the compressed gray scale range, and the compression is performed. Modulates the minimum pixel data having a first minimum grayscale value within the grayscale range down to a second minimum grayscale value outside the compressed grayscale range, and has an intermediate grayscale value between the first maximum grayscale value and the first minimum grayscale value Modulating the pixel data of the to grayscale modulation value t,
A difference between the arbitrary pixel data and the first maximum gradation value a, a difference between the arbitrary pixel data and the first minimum gradation value b, Gmax as the second maximum gradation value, and the second minimum gradation value When the value is Gmin, the half-tone modulation value t satisfies a: b = Gmax-t: t-Gmin. The method of claim 1,
Blueing the pixel data of the Nth horizontal line to blur the outline of the image every Nth horizontal line,
And a predetermined mask is used to define the weight of each of the M-th pixel data and its neighboring pixel data when the M-th (M is a natural number) pixel data is blue-processed. The method of claim 2,
Blueing the pixel data of the Nth horizontal line to blur the outline of the image every Nth horizontal line,
Shifting the mask by one pixel data unit and multiplying each of the M-th pixel data and its surrounding pixel data by a weight; And
And calculating the total sum of the pixel data multiplied by the weights as a modulation value of the M-th pixel data. The method of claim 1,
Compressing the pixel data of the Nth horizontal line subjected to the blue processing may include:
And dividing the pixel data by a predetermined scale factor to compress the pixel data. A display panel including a plurality of pixels to display two-dimensional and three-dimensional images;
A blueer processor blueing the pixel data of the Nth horizontal line to blur the outline of the image at every Nth (N is a natural number) horizontal line;
A compression processor to compress the blue processed pixel data; And
The maximum amount of pixel data having a first maximum gray scale value of the compression gray scale range among the pixel data having a gray scale value within the compressed gray scale range is upwardly modulated by the compression processor to a second maximum gray scale value outside the compressed gray scale range, and the compression is performed. Modulates the minimum pixel data having a first minimum grayscale value within the grayscale range down to a second minimum grayscale value outside the compressed grayscale range, and has an intermediate grayscale value between the first maximum grayscale value and the first minimum grayscale value A data stretching processor configured to modulate pixel data of the pixel by using a gray scale modulation value t,
A difference between the arbitrary pixel data and the first maximum gradation value a, a difference between the arbitrary pixel data and the first minimum gradation value b, Gmax as the second maximum gradation value, and the second minimum gradation value When the value is Gmin, the half-tone modulation value t satisfies a: b = Gmax-t: t-Gmin. The method of claim 5, wherein
The blueer processing unit,
When the M (M is a natural number) pixel data is blue-processed, a display device using a quality control method, wherein a preset mask is used to define a weight of each of the M-th pixel data and its neighboring pixel data. . The method according to claim 6,
The blueer processing unit,
Shifting the mask by one pixel data unit, multiplying each of the M-th pixel data and its surrounding pixel data by a weight, and calculating a sum of the pixel data multiplied by the weight as a modulation value of the M-th pixel data. Display apparatus using the image quality control method, characterized in that. The method of claim 5, wherein
The compression processing unit,
And dividing the pixel data by a predetermined scale factor to compress the pixel data.

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