KR102188900B1 - Display device including of data converter - Google Patents

Abstract

The data conversion unit according to an embodiment of the present invention converts red (Red; hereinafter R), green (green; hereinafter G), and blue (hereinafter hereinafter B) data to first data to convert white (hereinafter, hereinafter W), R A WRGB gray scale setting unit 510 that generates, G, and B data; A system setting unit 520 for setting first to third modulated data from a system between currently processed data among the W, R, G, and B data and data adjacent to the currently processed data and having the same color; A data converter configured to obtain modulated data mW, mR, mG, and mB by applying a weight for changing a position in a subpixel unit to each of the first to third modulated data.

Description

Display device including data conversion unit {DISPLAY DEVICE INCLUDING OF DATA CONVERTER}

The present invention relates to a display device including a data conversion unit.

In the future electronic products, including portable terminals, automobile displays, and medical devices, as well as image-based devices such as TVs and cameras, images will be widely used in order to effectively deliver a lot of information to users, and the importance of images is increasing in life. In addition, despite the limited size of displays of electronic products, the demand for high-resolution images is increasing. Therefore, the field of increasing the resolution of an image is also receiving great attention.

Most of the display devices currently used express colors using three primary colors (Red, Green, Blue). These display devices cannot express the full range of colors that humans can perceive. In this situation, many methods are being studied that can increase the resolution of an image.

As a representative device of a display device, a liquid crystal display device includes a liquid crystal panel composed of a thin film transistor substrate on which a thin film transistor is formed and a color filter substrate on which a color filter layer is formed, and a liquid crystal layer is positioned between the two substrates.

In general, most of the liquid crystal display devices form a color filter layer composed of three primary colors of red (R), green (G), and blue (B) on a color filter substrate, and control the amount transmitted through the color filter layer to achieve a desired color. Is displayed. Recently, as WRGB type display technology that improves luminance by adding white to RGB has been developed, a method of forming a pixel voltage of 4 colors using 3 colors, or a method of separately driving and simultaneously driving a pixel. A rendering driving technique in which pixels located around a pixel are driven together to disperse surrounding pixels and brightness to express one dot, etc. are used to drive a liquid crystal panel.

Among the rendering driving techniques, a sub-pixel rendering technique is used as a technique for enabling high-resolution display with a small number of display pixels. The sub-pixel rendering technique is a technique for performing display by applying a gray scale signal applied to a sub-pixel corresponding to an arbitrary color among any one display pixel by overlapping it with sub-pixels arranged around the display pixel. .

By using such a sub-pixel rendering technique, even if the number of sub-pixels for an RGB stripe array is doubled, it is possible to perform display with a resolution equivalent to that of a conventional RGB stripe array. Since the total number of sub-pixels can be reduced, the pixel area of each sub-pixel can be increased by 3/2, and it is also possible to realize a high aperture ratio. In addition, as one of the applications of the sub-pixel rendering technology, a liquid crystal display device having a color filter in which four sub-pixels of WRGB are arranged in stripes instead of an RGB stripe arrangement is also proposed.

A liquid crystal display device having a color filter in which four sub-pixels of WRGB are arranged in stripes, expands the input RGB data in the form of WRGB, and applies the above rendering technology to supplement the resolution. Display the image. However, when rendering is applied, the spacing of pixels of the same color that is physically repeated increases 3/4 compared to the existing RGB stripe, and pixels between the top and bottom are arranged in the same color, resulting in lower resolution and reduced lineability. The (Dim) phenomenon appears on the screen, resulting in deterioration of image quality.

Meanwhile, in the sub-pixel rendering technology, when mapping RGB data to WRGB pixels, the gradation values of WRGB are calculated from each of the four RGB pixels, and the gradation values of the three WRGB pixels can be determined using the sum of weights for each channel. However, such a mapping method may reduce perceived resolution and contour lines because blur of an image occurs. In addition, in the WRGB display, there is a problem that the thickness of a line expressed according to the pixel structure varies or the contrast is inferior.

In an embodiment of the present invention, a method of mapping a difference between a neighboring pixel and a gray level value according to a pixel structure is proposed.

The data conversion unit according to an embodiment of the present invention converts red (Red; hereinafter R), green (green; hereinafter G), and blue (hereinafter hereinafter B) data to first data to convert white (hereinafter, hereinafter W), R A WRGB gray scale setting unit 510 that generates, G, and B data; A system setting unit 520 for setting first to third modulated data from a system between currently processed data among the W, R, G, and B data and data adjacent to the currently processed data and having the same color; A data converter configured to obtain modulated data mW, mR, mG, and mB by applying a weight for changing a position in a subpixel unit to each of the first to third modulated data.

In the data conversion unit according to an embodiment of the present invention, the data adjacent to the currently processed data includes previous data of currently processed data and next data of the currently processed data.

In the data conversion unit according to an embodiment of the present invention, the gradation setting unit 520 compares the gradation value of the currently processed data with the gradation value of the adjacent data, and the gradation value of the currently processed data is a minimum value. If yes, a data conversion unit that processes the first modulated data as a gray scale value of the currently processed data and processes the second to third modulated data as 0.

In the data conversion unit according to an embodiment of the present invention, the gradation setting unit 520 compares the gradation value of the currently processed data with the gradation value of the adjacent data, and the gradation value of the currently processed data is a minimum value. If not, the first modulated data is a minimum grayscale value, the second modulated data is a difference between the intermediate grayscale value and the minimum grayscale value, and the third modulated data is the grayscale value of the currently processed data. A data conversion unit that is the difference between the middle grayscale values.

In the data conversion unit according to an embodiment of the present invention, the first to third modulated data satisfy Equation 1 below.

Equation 1

In Equation 1, C means any one of W, R, G, and B, each of Cp1, Cp2, and Cp3 means each of the first to third modulated data, and Cn is the currently processed data, Cn-1 And Cn+1 are data adjacent to the currently processed data (Cn), Cmin means the minimum grayscale value, Cmid means the grayscale value of the intermediate value, and the intermediate value is the grayscale value with no intermediate value. In this case, it is treated as the remaining values excluding the minimum and maximum values.

In the data conversion unit according to an embodiment of the present invention, the weight is an even-numbered line weight for processing W, R, G, and B data on an even-numbered vertical line of the display panel and W, R, and G on an odd-numbered vertical line of the display panel. , A data conversion unit including odd line weights for processing B data.

In the data conversion unit according to an embodiment of the present invention, the weight is composed of a 1 by 9 matrix, and the even line weight is a first even line weight applied to the first modulated data, and a first even line weight applied to the second modulated data. A second even line weight and a third even line weight applied to the third modulated data, the odd line weight being a first odd line weight applied to the first modulated data, and a first odd line weight applied to the second modulated data A data conversion unit including a second odd line weight and a third odd line weight applied to the third modulated data.

In the data conversion unit according to an embodiment of the present invention, in the (1, n) component of the first and second even line weights, the (1, 4), (1, 5), and (1, 6) components are (1, 1), (1, 2), (1, 3) components and (1, 7), (1, 8), (1, 9) components have a larger value than the weight of the third even line weight In (1, m) components, (1, 3), (1, 4), (1, 5) components have a larger value than other components, and (1, 2) and (1, 6) components ( 1, 1), (1, 7), (1, 8) and (1, 9) data conversion unit having a larger value than the component. In the above (1, n (or m)), 1 means a row, n (or m) means a column as any one value from 1 to 6, and a matrix corresponding to (1, n (or m)) Each component of is greater than or equal to 0.0 and less than or equal to 1.0.

Through this method, cognitive resolution can be increased and outlines can be improved, and a change in line thickness and a decrease in contrast can be prevented.

1 is a view showing a liquid crystal display device according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of the liquid crystal display panel of FIG. 1.
3 and 4 are diagrams showing an arrangement relationship of pixel electrodes.
5 is a block diagram of a data conversion unit.
6 and 7 are diagrams showing weights of a position change weight determination unit. In addition, FIGS. 8 and 9 show an example of a 1 by 9 weight determined by the position change weight determination unit.
10 is a diagram illustrating a first example of converting second data by applying a weight to first to third modulated data of a WRGB weight application unit.
11 is a diagram illustrating a second example of converting second data by applying a weight to first to third modulated data of a WRGB weight application unit.
12 is a diagram illustrating a third example of converting second data by applying a weight to first to third modulated data of a WRGB weight application unit.
13 is a diagram illustrating a fourth example of converting second data by applying a weight to first to third modulated data of a WRGB weight application unit.
14 and 15 are diagrams showing an image displayed on a screen when RGB data is converted into WRGB data and output to a display panel, and FIGS. 16 and 17 are diagrams illustrating a change in position of a subpixel through a WRGB modulator according to the present invention. This is a diagram showing an image displayed on the screen when the mWmRmGmB data is output to the display panel.

Hereinafter, with reference to the drawings of the display device including the data conversion unit according to an embodiment of the present invention will be described in detail. The following embodiments are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. In addition, in the drawings, the size and thickness of the device may be exaggerated for convenience. Throughout the specification, the same reference numbers indicate the same elements.

1 is a view showing a liquid crystal display according to an embodiment of the present invention.

As shown in FIG. 1, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal display panel 100 displaying an image and a gate driving gate lines GL1 to GLn of the liquid crystal display panel 100. A driver 200, a data driver 300 driving data lines DL1 to DLm of the liquid crystal display panel 100, and a timing controller 400 controlling the gate driver 200 and the data driver 300 ), and a data conversion unit 500 for first converting the input RGB data into WRGB data and second converting the WRGB data into mW, mR, mG, and mB data. In addition, the data conversion unit 500 may be configured separately from the timing controller 400 or may be a component of the timing controller 400.

In the liquid crystal display panel 100, a liquid crystal layer is formed between two glass substrates, and a plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm are formed on the lower glass substrate. A sub-pixel Pix is formed at the intersection of the gate lines GL1 to GLn and the plurality of data lines DL1 to DLm of.

The sub-pixel (Pix) includes a thin film transistor (TFT) connected to the gate line (GL) and a data line (DL), and a pixel electrode connected to the thin film transistor (TFT). The thin film transistor TFT supplies data from data lines DL1 to DLm to the liquid crystal cells in response to scan signals from the gate lines GL1 to GLn. To this end, the gate electrode of the thin film transistor TFT is connected to the gate lines GL1 to GLn, the source electrode is connected to the data lines DL1 to DLm, and the drain electrode is connected to the pixel electrode of the liquid crystal cell.

In addition, a storage capacitor for maintaining a voltage of a liquid crystal cell is formed on a lower glass substrate of the liquid crystal display panel 100.

On the upper glass substrate of the liquid crystal display panel 100, a color filter corresponding to each pixel region in which the thin film transistor (TFT) is formed, the gate lines GL1 to GLn, and data lines DL1 to DLm) and thin-film transistors (TFTs).

The gate driver 200 supplies a plurality of scan signals to a plurality of gate lines GL1 to GLn correspondingly in response to the gate control signal GCS from the timing controller 400. These plurality of scan signals cause the plurality of gate lines GL1 to GLn to be sequentially enabled for each period of one horizontal synchronization signal. The gate driver 200 may include a plurality of gate integrated circuits.

The data driver 300 generates a data voltage whenever any one of the plurality of gate lines GL1 to GLn is enabled in response to data control signals DCS from the timing controller 400. Each of the plurality of data lines DL1 to DLm of the liquid crystal display panel 100 is supplied.

The timing controller 400 uses various control signals (O_CS) supplied from an external system (for example, a graphic module of a computer system or an image demodulation module of a television reception system, not shown). A gate control signal GCS for controlling 200 and a data control signal DCS for controlling the data driver 300 are generated.

In addition, the timing controller 200 converts the mW, mR, mG, and mB data output from the data conversion unit 140 into data corresponding to the format on the liquid crystal display panel 100 and converts the data to the data driver 300 Provided as

The data conversion unit 500 receives input R, G, B data from an external system, first converts the received input R, G, B data into W, R, G, B, and converts W, R, and G and B are converted into first to third modulated data, and a weight is applied to the first to third modulated data, and the converted data is converted into mW, mR, mG, and mB data. Provides mW, mR, mG, mB data. A detailed description of the data conversion unit 500 will be described later.

FIG. 2 is a schematic cross-sectional view of the liquid crystal display panel of FIG. 1.

1 and 2, the liquid crystal display panel 100 includes a first substrate 101, a second substrate 102 facing the first substrate 101, and the first and second substrates. And a liquid crystal layer LC formed between the substrates 101 and 102.

A pixel electrode 103 formed of a transparent conductive film such as an indium tin oxide (ITO) film is formed on the first substrate 101 to correspond to each of the plurality of sub-pixels Pix for constituting the display pixel. Has been. Further, the pixel electrode 103 is connected to a thin film transistor (TFT) 104 as a switching element.

The pixel electrode 103 and the thin film transistor 104 are insulated from the pixel electrode 103 and the thin film transistor 104 in another sub-pixel (Pix) by an insulating film 105.

An alignment layer is formed on the pixel electrode 103 to cover the pixel electrode 103 to define an initial alignment state of the liquid crystal constituting the liquid crystal layer LC.

Meanwhile, the second substrate 102 is a substrate having transparency such as a glass substrate. The second substrate 102 may include a grid-shaped black matrix 106. The black matrix 106 has its openings corresponding to the pixel electrodes 103. In the opening formed by the black matrix 106, a color filter corresponding to a predetermined color enhancement for each sub-pixel (Pix) (in the drawing, a color filter corresponding to white (W), red (R), green (G), and blue (B)) The white (W) color filter may be formed in consideration of the color temperature and the thickness of the adjacent color filter, and may be omitted. In this case, power efficiency may increase due to an increase in transmittance due to the presence of the color filter unit.

A common electrode 108 is formed on the color filter 107. The potential of the common electrode 108 is a potential common to each sub-pixel (Pix). An alignment layer 109 may be formed on the common electrode 108 to define an initial alignment state of liquid crystals constituting the liquid crystal layer LC in the same manner as the first substrate 101.

3 and 4 are diagrams showing an arrangement relationship of pixel electrodes.

3 and 4, the sub-pixels 121 of the pixels 120 constituting the liquid crystal display panel 100 may be WRGB sub-pixels arranged in a mosaic shape.

One pixel 120 may include three sub-pixels 121, and three sub-pixels 121 of W, R, G, and B sub-pixels may be included in one pixel 120.

At this time, by introducing the W color filter to the RGB color filter, it becomes possible to improve the luminance when performing white display.

In addition, sub-pixels for each color in the odd-numbered horizontal line (n) are sequentially arranged in the order of the W sub-pixel 111, the R sub-pixel 112, the G sub-pixel 113, and the B sub-pixel 114. In the horizontal line (n+1), subpixels for each color may be sequentially arranged in the order of the G subpixel 113, the B subpixel 114, the W subpixel 111, and the R subpixel 112. . That is, the sub-pixels for each color in the odd-numbered horizontal line (n) and the sub-pixels for each color in the even-numbered horizontal line (n+1) are not arranged in the same color in the vertical direction, but may be arranged in a zigzag shape. have. For example, the W subpixel 111 may be disposed at a point where the m-th vertical line and the odd-th horizontal line (n) intersect and the m+2th vertical line and the even-th horizontal line (n+1). have. That is, any one of the subpixels W, R, G, B of the odd horizontal line (n) in an arbitrary vertical line is a vertical shifted by two spaces from the arbitrary vertical line in the even horizontal line (n+1). It can be placed equally on the line. (Move two spaces in subpixel units)

In this way, the zigzag structure in which the same subpixel is moved by two subpixel units in the odd-numbered horizontal line (n) and the even-numbered horizontal line (n+1) is repeated, compared to the structure in which the same subpixel appears in the vertical direction. It is possible to prevent the phenomenon that the line is visually recognized.

5 is a block diagram of a data conversion unit.

5, the data conversion unit 500 according to an embodiment of the present invention includes a WRGB gray level setting unit 510, a level setting unit 520, a WRGB weight application unit 530, and a position change weight determining unit ( 540) may be included.

The WRGB gray scale setting unit 510 may convert input RGB data into WRGB data, and may be referred to as first conversion or first data conversion.

In order to display an image on the liquid crystal display panel 100 having a WRGB pixel structure, the RGB data is mapped from RGB grayscale to WRGB grayscale. That is, W data may be extracted from R data and G data B data, and new R, G, and B data may be generated based on the extracted W data and the R, G, and B data.

As an example, the WRGB grayscale setting unit 510 extracts a common grayscale value such as Equation 1 or a minimum grayscale value such as Equation 2 from R, G, and B data, and generates the W data. The R, G, and B data may be generated by subtracting the W data from each of the input data of ,B.

Equation 1

Equation 2

As another example, the WRGB gray scale setting unit 510 converts R, G, and B data to 4 based on a data conversion method set according to a luminance characteristic of each unit pixel according to characteristics such as luminance and/or driving of each sub-pixel. Index R data, G data B data can be converted into W data.

In this case, the WRGB grayscale setting unit 510 may map from RGB grayscale to WRGB grayscale according to the conversion method disclosed in Korean Patent Application Publication No. 10-2013-0060476 or 10-2013-0030598.

In addition, as a method of generating second WRGB data 515 (W2, R2, G2, B2) from the second RGB data 512, which is specific RGB data, among input RGB data, not only the second RGB data 512 but also the first RGB data 511 and third RGB data 513 may be used. That is, adjacent RGB data may be used as a method of converting the first data from specific RGB data to WRGB data. The same method may be applied to a method of converting the first WRGB data 514 (W1, R1, G1, B1) and the third WRGB data 516 (W3, R3, G3, B3).

The level setting unit 520 may set a level between WRGB color data of the current process data and WRGB color data adjacent to the current process data according to Equation (3). In addition, Equation 4 satisfies setting the relationship between the W data of the current processed data and the adjacent data W data, and Equation 5 sets the relationship between the R data of the current processed data and the adjacent R data. And Equation 6 satisfies setting the relationship between the G data of the current processed data and the G data adjacent to the data, and Equation 7 is the relationship between the B data of the current processed data and the B data that is adjacent data. It can be fulfilled to establish a system.

In this way, in order to increase the recognition resolution of the contour by setting the level between the data forming the contour, the previous data of the current processing data and the next data of the current processing data may be considered as the current processing data and the data adjacent to the current processing data. .

Equation 3

In Equation 3, C means Color, each of Cp1, Cp2, and Cp3 means each of the first to third modulated data, and can be any one of W, R, G, B, and Cn is currently processed. The data, Cn-1 and Cn+1, are data adjacent to the currently processed data Cn, Cmin means the minimum grayscale value, and Cmid means the intermediate grayscale value. On the other hand, if there is no grayscale value with an intermediate value, the value is processed as the remaining values excluding the minimum and maximum values.

Equation 4

In Equation 4, W means White, each of Wp1, Wp2, and Wp3 means each of the first to third modulated data, Wn is currently processed data, and Wn-1 and Wn+1 are currently processed data. Data adjacent to (Wn), Wmin means the minimum grayscale value, and Wmid means the intermediate grayscale value. On the other hand, if there is no grayscale value with an intermediate value, the value is processed as the remaining values excluding the minimum and maximum values.

Equation 5

In Equation 5, R represents Red, each of Rp1, Rp2, and Rp3 represents each of the first to third modulated data, Rn is currently processed data, and Rn-1 and Rn+1 are currently processed data. Data adjacent to (Rn), Rmin means the minimum grayscale value, and Rmid means the intermediate grayscale value. On the other hand, if there is no grayscale value with an intermediate value, the value is processed as the remaining values excluding the minimum and maximum values.

Equation 6

In Equation 6, G denotes Green, Gp1, Gp2, and Gp3 each denote first to third modulated data, Gn denotes currently processed data, Gn-1 and Gn+1 denotes currently processed data Data adjacent to (Gn), Gmin means the minimum grayscale value, and Gmid means the intermediate grayscale value. On the other hand, if there is no grayscale value with an intermediate value, it is processed as the remaining values excluding the minimum and maximum values.

Equation 7

In Equation 7, B denotes Blue, Bp1, Bp2, and Bp3 each denote first to third modulated data, Bn denotes currently processed data, Bn-1 and Bn+1 denotes currently processed data Data adjacent to (Bn), Bmin means the minimum grayscale value, and Bmid means the intermediate grayscale value. On the other hand, if there is no grayscale value with an intermediate value, it is processed as a value close to the minimum value.

According to Equation 3, which generalizes Equations 4 to 7 of W, R, G, and B, the gradation setting unit 520 includes a gradation value of the currently processed data and adjacent data corresponding to the same color. The first step of determining whether the grayscale value of the currently processed data is the minimum grayscale value compared to the grayscale value of the data of the same color adjacent to the grayscale value, and when the grayscale value of the currently processed data is not the minimum grayscale value. When the grayscale value of the processed data is the maximum grayscale value, even a second system for deriving a difference value from the grayscale value of adjacent data may perform the determination step.

Through the above method, the system setting unit 520 may generate and output first to third modulated data for each of the first data-converted W, R, G, and B data.

The WRGB weight application unit 530 performs second data conversion using the first to third modulated data from the system setting unit 520 and the weight from the position change weight determination unit 540 to convert the final modulated data mW. , mR, mG, mB can be output.

6 and 7 are diagrams showing weights of a position change weight determination unit. In addition, FIGS. 8 and 9 show an example of 1 by 9 weights determined by the position change weight determination unit.

6 and 7, the position change weight determination unit 540 may determine a weight for position change of a subpixel. The weight may be in the form of a 1 by 9 matrix. In addition, values of the (1, n) component constituting the matrix may have any one of 0.0 to 1.0. In other words, in (1, n), 1 means a row, n) is any one of 1 to 6, which means a column, and each component of the matrix corresponding to (1, n) is greater than or equal to 0.0, and Less than or equal to 1.0.

These weights may be output to the WRGB weight application unit 530 by referring to the weights previously stored in the memory included in the position change weight determining unit 540. In addition, the even vertical line weight ωeven applied to the even pixels in the vertical direction and the odd vertical line weight ωodd2 applied to the odd pixels in the vertical direction may be different from each other.

By applying different weights for even vertical lines (ωeven) and odd vertical line weights (ωodd2) in this way, the degree of movement of the data on the even vertical line in pixel units can be different from the movement degree of data on the odd vertical line in units of pixels. . Thus, data on any one of the even or odd lines may be moved in pixel units in consideration of the perceived resolution of the outline according to the contrast.

The even vertical line weight (ωeven) is a first even vertical line weight (ωeven1) applied to the first modulation data Cp1, a second even vertical line weight (ωeven2) applied to the second modulation data Cp2, and the third modulation data Cp3. A third even vertical line weight (ωeven3) applied to may be included.

The odd vertical line weight (ωodd2) is a first odd vertical line weight (ωodd1) applied to the first modulation data Cp1, a second odd vertical line weight (ωodd2) applied to the second modulation data Cp2, and the third modulation data Cp3. A third odd vertical line weight (ωodd3) applied to may be included.

Each of the first to third even vertical line weights ωeven1, ωeven2, and ωeven3 may include a processing pixel corresponding region 542, a first processing pixel neighboring region 541, and a second processing pixel neighboring region 543. . In addition, each of the first to third odd vertical line weights (ωodd1, ωodd2, ωodd3) includes a processing pixel correspondence region 542, a first processing pixel neighboring region 541, and a second processing pixel neighboring region 543. I can.

In the case of the first even-numbered vertical line weight (ωeven1), each of the weights B1, B2, and B3 of the processing pixel correspondence region 542 may have the same value or a value very close to each other, and the first processing pixel adjacent region Each of the weights A1, A2, and A3 of 541 may have the same value or a value very close to each other, and each of the weights C1, C2, C3 of the second processing pixel adjacent region 543 is the same value. Or they can have values that are very close to each other. In addition, a difference value between the weights B1, B2, and B3 of the processing pixel correspondence region 542 and the weights A1, A2, A3 of the first processing pixel adjacent region 541 and the processing pixel correspondence region 542 The difference between the weights B1, B2, and B3 of and the weights C1, C2, and C3 of the second processing pixel adjacent region 543 is the weights A1 and B of the first processing pixel adjacent region 541 It may be set to be greater than a difference value between the weights C1, C2, and C3 of the A2 and A3 and the second processing pixel adjacent regions 543.

In the case of the second even vertical line weight ωeven2, each of the weights B1, B2, and B3 of the processing pixel correspondence region 542 may have the same value or a value very close to each other, and the first processing pixel adjacent region Each of the weights A1, A2, and A3 of 541 may have the same value or a value very close to each other, and each of the weights C1, C2, C3 of the second processing pixel adjacent region 543 is the same value. Or they can have values that are very close to each other. In addition, a difference value between the weights B1, B2, and B3 of the processing pixel correspondence region 542 and the weights A1, A2, A3 of the first processing pixel adjacent region 541 and the processing pixel correspondence region 542 The difference between the weights B1, B2, and B3 of and the weights C1, C2, and C3 of the second processing pixel adjacent region 543 is the weights A1 and B of the first processing pixel adjacent region 541 It may be set to be greater than a difference value between the weights C1, C2, and C3 of the A2 and A3 and the second processing pixel adjacent regions 543.

In addition, the weights B1, B2, B3 of the processing pixel correspondence region 542 in the first even vertical line weight ωeven1 and the weights of the processing pixel correspondence region 542 in the second even vertical line weight ωeven2 ( B1, B2, and B3 may have the same or very close to each other, and the weights (A1, A2, A3) of the first processing pixel adjacent region 541 in the first even vertical line weight (ωeven1) 2 In the even vertical line weight ωeven2, the weights A1, A2, and A3 of the first processing pixel adjacent region 541 may have the same or very close values, and the first even vertical line weight ωeven1 The weights C1, C2, and C3 of the second processing pixel neighboring region 543 and the weights C1, C2, C3 of the second processing pixel neighboring region 543 in the second even vertical line weight ωeven2 May have values that are the same or very close to each other.

In the case of the third even vertical line weight (ωeven3), values of A3, B1, and B2 may be set to be the same or very close to each other, and A1 may be set to a value smaller than the values of A2 and A3, and A2 may be A1 And a median value of A3 or a value very close to the median value. In addition, each of C1, C2, and C3 may have the same or very close value to each other, and the C1, C2, and C3 may have the same or very close value to the A1 value. In addition, the B3 value may be set to a value intermediate or very close to the intermediate value between B2 and C1.

The above-described first even vertical line weight ωeven1 may be described in the same manner for the first odd vertical line weight ωodd1, and the second even vertical line weight ωeven2. May be similarly described for the second odd-numbered line weight (ωodd2).

In the case of the third odd vertical line weight (ωodd3), Each of the weights B1, B2, and B3 of the processing pixel correspondence region 542 may have the same value or very close to each other, and the weights A1, A2, A3 of the first processing pixel adjacent region 541 Among the values of A1 and A2 may have the same or very close values, values of A1 and A2 may have values smaller than those of B1, B2 and B3, and values of A3 may be any one of A1 and A2 and B1 and B2. And B3 may be set to an intermediate value or a value very close to the intermediate value. And among the weights C1, C2, and C3 of the second processing pixel adjacent region 543, values C2 and C3 may have the same or very close values, and the values C2 and C3 are the B1, B2, and B3 values. It has a value smaller than that, and the C1 value may be set to be an intermediate value or a value very close to the intermediate value of any one of C2 and C3 and any one of B1, B2 and B3.

An example of the position change weight set in the above manner may be a matrix as shown in FIGS. 8 and 9.

10 is a diagram illustrating a first example of converting second data by applying a weight to first to third modulated data of a WRGB weight application unit.

When RGB data is converted to the first data to obtain WRGB data (W1R1G1B1, W2R2G2B2, W3R3G3B3, W4R4G4B4), each of W1, R1, G1 and B1 is (0, 0, 0, 0), and W2, R2, G2, Each of B2 is (100, 100, 100, 100), each of W3, R3, G3, and B3 is (0, 0, 0, 0), and each of W4, R4, G4, and B4 is (0, 0, 0) , 0).

Referring to FIG. 10, the gradation setting unit 520 receives (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3) input from the WRGB gradation setting unit 510. , B3), (W4, R4, G4, B4) of (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3, B3) required when processing even lines The first to third modulated data Cp1, Cp2, and Cp3 may be obtained. And from (W2, R2, G2, B2), (W3, R3, G3, B3), (W4, R4, G4, B4), Cp1, Cp2, Cp3, which are the first to third modulated data required for processing odd lines. Can be obtained.

When processing even lines, the current processed data Cn is called (W2, R2, G2, B2), the adjacent data Cn-1 is (W1, R1, G1, B1), and Cn+1 is (W3, R3, G3, B3). And in (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3, B3) according to Equation 3, the minimum grayscale value for each color is 0 and the maximum grayscale value is 100. , The remaining values excluding the middle value or the minimum grayscale value and the maximum grayscale value are 0. Accordingly, the first modulation data Cp1 = 0, the second modulation data Cp2 = 0, and the third modulation data Cp3 = 100. Then, first to third even vertical line weights (ωeven1, ωeven2, ωeven3) are applied to each of the first to third modulated data Cp1, Cp2, and Cp3.

Also, when processing odd lines, the current processed data Cn is called (W3, R3, G3, B3), the adjacent data Cn-1 is (W2, R2, G2, B2), and Cn+1 is (W4, R4, G4). , B4). And according to Equation 3, the currently processed data in (W2, R2, G2, B2), (W3, R3, G3, B3), (W4, R4, G4, B4) is the minimum value (0, 0, 0, 0), so the first modulated data Cp1 = 0, the second modulated data Cp2 = 0, and the third modulated data Cp3 = 0. Then, first to third odd vertical line weights (ωodd1, ωodd2, ωodd3) are applied to each of the first to third modulated data Cp1, Cp2, and Cp3.

As above, the first to third even vertical line weights (ωeven1, ωeven2, ωeven3) and the first to third odd vertical line weights (ωodd1, ωodd2, ωodd3) to the first to third modulated data (Cp1, Cp2, Cp3) Is applied and summed up for each sub-pixel, that is, (mW1, mR1, mG1), (mB1, mW2, mR2), (mG2, mB2, mW3), (mR3, mG3, mB3). =0, mR1=50, mG1=100), (mB1=100+0=100, mW2=100+0=100, mR2=50+0=50), (mG2=0+0=0, mB2=0 +0=0, mW3=0+0=0) and (mR3=0, mG3=0, mB3=0). In this way, through the second data conversion, the effect of moving in the horizontal direction in units of sub-pixels is obtained.

On the other hand, if the currently processed data is W1, R1, G1, B1, there is no previous data of W1, R1, G1, B1 data, so when weight is applied, the previous data of W1, R1, G1, B1 data is padded with zero (0). Alternatively, W1, R1, G1, B1 data can be copied to the previous data. Also, in the case of mR3, mG3, and mB3 data, values determined according to the weight of the next even-numbered line may be finally added and determined.

11 is a diagram illustrating a second example of converting second data by applying a weight to first to third modulated data of a WRGB weight application unit.

When RGB data is converted to first data to obtain WRGB data (W1R1G1B1, W2R2G2B2, W3R3G3B3, W4R4G4B4), each of W1, R1, G1, and B1 is (0, 0, 0, 0), and W2, R2, G2, Each of B2 is (50, 50, 50, 50), each of W3, R3, G3, and B3 is (100, 100, 100, 100), and each of W4, R4, G4, and B4 is (0, 0, 0) , 0).

Referring to FIG. 11, the gradation setting unit 520 receives (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3) input from the WRGB gradation setting unit 510. , B3), (W4, R4, G4, B4) of (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3, B3) required when processing even lines The first to third modulated data Cp1, Cp2, and Cp3 may be obtained. And from (W2, R2, G2, B2), (W3, R3, G3, B3), (W4, R4, G4, B4), Cp1, Cp2, Cp3, which are the first to third modulated data required for processing odd lines. Can be obtained.

When processing even lines, the current processed data Cn is called (W2, R2, G2, B2), the adjacent data Cn-1 is (W1, R1, G1, B1), and Cn+1 is (W3, R3, G3, B3). And in (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3, B3) according to Equation 3, the minimum grayscale value for each color is 0 and the maximum grayscale value is 100. , Except for the middle value or the minimum grayscale value and the maximum grayscale value, the remaining values are 50. Accordingly, the first modulation data Cp1 = 0, the second modulation data Cp2 = 50, and the third modulation data Cp3 = 0. Then, first to third even vertical line weights (ωeven1, ωeven2, ωeven3) are applied to each of the first to third modulated data Cp1, Cp2, and Cp3.

Also, when processing odd lines, the current processed data Cn is called (W3, R3, G3, B3), the adjacent data Cn-1 is (W2, R2, G2, B2), and Cn+1 is (W4, R4, G4). , B4). And in (W2, R2, G2, B2), (W3, R3, G3, B3), (W4, R4, G4, B4) according to Equation 3, the minimum grayscale value for each color is 0 and the maximum grayscale value is 100. , Except for the middle value or the minimum grayscale value and the maximum grayscale value, the remaining values are 50. Accordingly, the first modulation data Cp1 = 0, the second modulation data Cp2 = 50, and the third modulation data Cp3 = 50. Then, first to third odd vertical line weights (ωodd1, ωodd2, ωodd3) are applied to each of the first to third modulated data Cp1, Cp2, and Cp3.

As above, the first to third even vertical line weights (ωeven1, ωeven2, ωeven3) and the first to third odd vertical line weights (ωodd1, ωodd2, ωodd3) to the first to third modulated data (Cp1, Cp2, Cp3) Is applied and summed up for each sub-pixel and divided into (mW1, mR1, mG1), (mB1, mW2, mR2) and (mG2, mB2, mW3) for each pixel, (mW1=0, mR1=0, mG1). =0), (mB1=50+0=50, mW2=50+0=50, mR2=50+0=50), (mG2=0+100=100, mB2=0+100=100, mW3=0 +100=100) and (mR3=50, mG3=0, mB3=0). In this way, through the second data conversion, the effect of moving in the horizontal direction in units of sub-pixels is obtained.

12 is a diagram illustrating a third example of converting second data by applying a weight to first to third modulated data of a WRGB weight application unit.

When RGB data is converted to first data to obtain WRGB data (W1R1G1B1, W2R2G2B2, W3R3G3B3, W4R4G4B4), each of W1, R1, G1, and B1 is (0, 0, 0, 0), and W2, R2, G2, Each of B2 is (100, 100, 100, 100), each of W3, R3, G3, and B3 is (100, 100, 100, 100), and each of W4, R4, G4, and B4 is (0, 0, 0) , 0).

Referring to FIG. 12, the gradation setting unit 520 receives (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3) input from the WRGB gradation setting unit 510. , B3), (W4, R4, G4, B4) of (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3, B3) required when processing even lines The first to third modulated data Cp1, Cp2, and Cp3 may be obtained. And from (W2, R2, G2, B2), (W3, R3, G3, B3), (W4, R4, G4, B4), Cp1, Cp2, Cp3, which are the first to third modulated data required for processing odd lines. Can be obtained.

When processing even lines, the current processed data Cn is called (W2, R2, G2, B2), the adjacent data Cn-1 is (W1, R1, G1, B1), and Cn+1 is (W3, R3, G3, B3). And in (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3, B3) according to Equation 3, the minimum grayscale value for each color is 0 and the maximum grayscale value is 100. , The remaining values excluding the middle value or the minimum grayscale value and the maximum grayscale value are 100. Accordingly, the first modulation data Cp1 = 0, the second modulation data Cp2 = 100, and the third modulation data Cp3 = 0. Then, first to third even vertical line weights (ωeven1, ωeven2, ωeven3) are applied to each of the first to third modulation data Cp1, Cp2, and Cp3.

Also, when processing odd lines, the current processed data Cn is called (W3, R3, G3, B3), the adjacent data Cn-1 is (W2, R2, G2, B2), and Cn+1 is (W4, R4, G4). , B4). And in (W2, R2, G2, B2), (W3, R3, G3, B3), (W4, R4, G4, B4) according to Equation 3, the minimum grayscale value for each color is 0 and the maximum grayscale value is 100. , The remaining values excluding the middle value or the minimum grayscale value and the maximum grayscale value are 100. Accordingly, the first modulation data Cp1 = 0, the second modulation data Cp2 = 100, and the third modulation data Cp3 = 0. Then, first to third odd vertical line weights (ωodd1, ωodd2, ωodd3) are applied to each of the first to third modulated data Cp1, Cp2, and Cp3.

As above, the first to third even vertical line weights (ωeven1, ωeven2, ωeven3) and the first to third odd vertical line weights (ωodd1, ωodd2, ωodd3) to the first to third modulated data (Cp1, Cp2, Cp3) Is applied and summed up for each sub-pixel and divided into (mW1, mR1, mG1), (mB1, mW2, mR2) and (mG2, mB2, mW3) for each pixel, (mW1=0, mR1=0, mG1). =0), (mB1=100+0=100, mW2=100+0=100, mR2=100+0=100), (mG2=0+100=100, mB2=0+100=100, mW3=0 +100=100) and (mR3=0, mG3=0, mB3=0). In this way, through the second data conversion, the effect of moving in the horizontal direction in units of sub-pixels appears.

13 is a diagram illustrating a fourth example of converting second data by applying a weight to first to third modulated data of a WRGB weight application unit.

When RGB data is converted to first data to obtain WRGB data (W1R1G1B1, W2R2G2B2, W3R3G3B3, W4R4G4B4), each of W1, R1, G1, and B1 is (0, 0, 0, 0), and W2, R2, G2, Each of B2 is (0, 0, 0, 0), each of W3, R3, G3, and B3 is (100, 100, 100, 100), and each of W4, R4, G4, and B4 is (0, 0, 0) , 0).

13, the level setting unit 520 receives (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3) received from the WRGB gray level setting unit 510. , B3), (W4, R4, G4, B4) of (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3, B3) required when processing even lines The first to third modulated data Cp1, Cp2, and Cp3 may be obtained. And from (W2, R2, G2, B2), (W3, R3, G3, B3), (W4, R4, G4, B4), Cp1, Cp2, Cp3, which are the first to third modulated data required for processing odd lines. Can be obtained.

When processing even lines, the current processed data Cn is called (W2, R2, G2, B2), the adjacent data Cn-1 is (W1, R1, G1, B1), and Cn+1 is (W3, R3, G3, B3). And in (W1, R1, G1, B1), (W2, R2, G2, B2), (W3, R3, G3, B3) according to Equation 3, the minimum grayscale value for each color is 0 and the maximum grayscale value is 100. , The remaining values excluding the middle value or the minimum grayscale value and the maximum grayscale value are 0. And since the gray scale values of the currently processed data (W2, R2, G2, B2) are the minimum values, the first modulated data Cp1 = 0, the second modulated data Cp2 = 0, and the third modulated data Cp3 = 0. Then, first to third even vertical line weights (ωeven1, ωeven2, ωeven3) are applied to each of the first to third modulated data Cp1, Cp2, and Cp3.

Also, when processing odd lines, the current processed data Cn is called (W3, R3, G3, B3), the adjacent data Cn-1 is (W2, R2, G2, B2), and Cn+1 is (W4, R4, G4). , B4). And in (W2, R2, G2, B2), (W3, R3, G3, B3), (W4, R4, G4, B4) according to Equation 3, the minimum grayscale value for each color is 0 and the maximum grayscale value is 100. , The remaining values excluding the middle value or the minimum grayscale value and the maximum grayscale value are 0. Accordingly, the first modulation data Cp1 = 0, the second modulation data Cp2 = 0, and the third modulation data Cp3 = 100. Then, first to third odd vertical line weights (ωodd1, ωodd2, ωodd3) are applied to each of the first to third modulated data Cp1, Cp2, and Cp3.

As above, the first to third even vertical line weights (ωeven1, ωeven2, ωeven3) and the first to third odd vertical line weights (ωodd1, ωodd2, ωodd3) to the first to third modulated data (Cp1, Cp2, Cp3) Is applied and summed up for each sub-pixel and divided into (mW1, mR1, mG1), (mB1, mW2, mR2) and (mG2, mB2, mW3) for each pixel, (mW1=0, mR1=0, mG1). =0), (mB1=0+0=0, mW2=0+0=0, mR2=0+50=50), (mG2=0+100=100, mB2=0+100=100, mW3=0 +100=100) and (mR3=50, mG3=0, mB3=0). In this way, through the second data conversion, the effect of moving in the horizontal direction in units of sub-pixels is obtained.

14 and 15 are diagrams showing an image displayed on a screen when RGB data is converted into WRGB data and output to a display panel, and FIGS. 16 and 17 are diagrams illustrating a change in position of a subpixel through a WRGB modulator according to the present invention. This is a diagram showing an image displayed on a screen when the mWmRmGmB data is output to a display panel.

Referring to FIGS. 14 and 15, when only a mapping method for converting general RGB data into WRGB data is applied (a method of outputting to a display panel after mapping WRGB data according to configuration 510), blurring of an image occurs. Able to know. Also, the thickness of the line may change or the contrast may decrease. However, when changing the position of the sub-pixels as shown in FIGS. 16 and 17, the resolution increases and the thickness of the vertical line is constant, so that the outline can be improved, and the change in the line thickness and the decrease in contrast can be prevented.

In the detailed description of the present invention described above, it has been described with reference to preferred embodiments of the present invention, but those skilled in the art or those of ordinary skill in the relevant technical field of the present invention described in the claims to be described later It will be understood that various modifications and changes can be made to the present invention without departing from the spirit and technical scope. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be determined by the claims.

100 display panel
101 first substrate
102 second substrate
103 pixel electrode
104 Thin Film Transistor
105 insulating film
106 black matrix
107 color filter
108 common electrode
109 Alignment film
120 pixels
121 subpixels
111 W subpixel
112 R subpixel
113 G subpixel
114 B subpixel
200 gate driver
300 data driver
400 timing controller
500 data modulator
510 WRGB gradation setting unit
520 series even setting unit
530 WRGB weight application unit
540 Position change weight determination unit

Claims (8)

WRGB gray scale setting that generates white (W), R, G, and B data by first converting red (red; hereinafter R), green (green; hereinafter G), blue (blue; hereinafter B) data part;
A system setting unit for setting first to third modulated data from a system between currently processed data among the W, R, G, and B data and data adjacent to the currently processed data and having the same color;
A WRGB weight application unit for obtaining modulated data mW, mR, mG and mB by applying a weight for changing a position in a subpixel unit to each of the first to third modulated data,
The data (hereinafter referred to as adjacent data) adjacent to the currently processed data and having the same color (hereinafter, referred to as adjacent data) includes previous data of the currently processed data and next data of the currently processed data. delete The method of claim 1,
Even the system setting unit,
When the gray level value of the currently processed data is the minimum value by comparing the gray level value of the currently processed data and the gray level value of the adjacent data, the first modulated data is processed as the gray level value of the currently processed data, and the first A data conversion unit that processes the 2nd to 3rd modulated data as 0. The method of claim 3,
Even the system setting unit,
When the grayscale value of the currently processed data is compared with the grayscale value of the adjacent data and the grayscale value of the currently processed data is not the minimum value, the first modulated data becomes the minimum grayscale value, and the second modulated data is A data conversion unit that is a difference value between the intermediate grayscale value and the minimum grayscale value, and the third modulated data is a difference value between the grayscale value of currently processed data and the intermediate grayscale value. The method of claim 1,
The first to third modulated data is a data conversion unit that satisfies Equation 1 below.
Equation 1

In Equation 1, C means any one of W, R, G, and B, each of Cp1, Cp2, and Cp3 means each of the first to third modulated data, and Cn is the currently processed data, Cn-1 And Cn+1 are data adjacent to the currently processed data (Cn), Cmin means the minimum grayscale value, Cmid means the grayscale value of the intermediate value, and the intermediate value is the grayscale value with no intermediate value. In this case, it is treated as the remaining values excluding the minimum and maximum values. The method of claim 5,
The weight includes an even line weight processing W, R, G, B data on an even vertical line of the display panel and an odd line weight processing W, R, G, B data on an odd vertical line of the display panel. Data conversion unit. The method of claim 6,
The weight is composed of a 1 by 9 matrix,
The even line weight includes a first even line weight applied to the first modulated data, a second even line weight applied to the second modulated data, and a third even line weight applied to the third modulated data,
The odd line weight is data including a first odd line weight applied to the first modulated data, a second odd line weight applied to the second modulated data, and a third odd line weight applied to the third modulated data Conversion part. The method of claim 7,
In the (1, n) component of the weights of the first and second even lines,
(1, 4), (1, 5), (1, 6) components are (1, 1), (1, 2), (1, 3) components and (1, 7), (1, 8), Has a value greater than the (1, 9) component,
In the (1, m) component of the third even-numbered line weight,
Components (1, 3), (1, 4), (1, 5) have a larger value than other components, and components (1, 2) and (1, 6) are (1, 1), (1, 7) ), (1, 8) and (1, 9) data conversion unit having a larger value than the component.
In the above (1, n (or m)), 1 means a row, n (or m) means a column as any one value from 1 to 6, and a matrix corresponding to (1, n (or m)) Each component of is greater than or equal to 0.0 and less than or equal to 1.0.

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