BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of a plasma display device according to an exemplary embodiment of the present invention.
FIG. 2 is a top plan view illustrating a portion of pixels and an electrode arrangement of a PDP according to an exemplary embodiment of the present invention.
FIG. 3A is a view conceptionally illustrating a method of converting and alternately arranging video signal data of upper and lower pixels adjacent a black horizontal line to video signal data that is alternately cyan-biased and magenta-biased.
FIG. 3B is a view conceptionally illustrating a method of converting and alternately arranging video signal data of upper and lower pixels adjacent a black vertical line to video signal data that is alternately cyan-biased and magenta-biased.
FIG. 4A is a view conceptionally illustrating a method of converting and alternately arranging video signal data of upper and lower pixels adjacent a white horizontal line to video signal data that is alternately cyan-biased and magenta-biased.
FIG. 4B is a view conceptionally illustrating a method of converting and alternately arranging video signal data of upper and lower pixels adjacent a white vertical line to video signal data that is alternately cyan-biased and magenta-biased.
FIG. 5 is a partial block diagram of a controller of FIG. 1.
FIG. 6 is a view illustrating arrangement of pixels in a pixel structure of the PDP as in FIG. 2.
FIG. 7A is a view illustrating a case of applying Equations 1 to 6 to video signal data of a black horizontal line.
FIG. 7B is a view illustrating a case of applying Equations 1 to 6 to video signal data of a white horizontal line.
FIG. 8A is a view illustrating final video signal data of the video signal data as in FIG. 7A.
FIG. 8B is a view illustrating final video signal data of the video signal data as in FIG. 7B.
DETAILED DESCRIPTION
In the specification, when it is said that any part is “connected” to another part, it means the part is “directly connected” to the other part or “electrically connected” to the other part with at least one intermediate part.
FIG. 1 is a schematic view of a plasma display device according to an exemplary embodiment of the present invention.
As shown in FIG. 1, the plasma display device according to an exemplary embodiment of the present invention includes a PDP 100, a controller 200, an address electrode driver 300, a scan electrode driver 400, and a sustain electrode driver 500.
The PDP 100 includes a plurality of row electrodes that extend in a row direction and perform a scanning function and a display function, and a plurality of column electrodes that extend in a column direction and perform an address function. In FIG. 1, the column electrodes are shown as address electrodes A1-Am and the row electrodes are shown as sustain electrodes X1-Xn and scan electrodes Y1-Yn forming pairs. FIG. 2 shows a more detailed structure of the PDP 100 according to the exemplary embodiment of the present invention shown in FIG. 1.
The controller 200 receives a video signal from the outside, outputs an address driving control signal, a sustain electrode driving control signal, and a scan electrode control signal, and divides one field into a plurality of subfields each having a weight value. Each subfield includes an address period for selecting a discharge cell to emit light among a plurality of discharge cells, and a sustain period for performing a sustain discharge of a discharge cell that is selected as a discharge cell to emit light in the address period during a period corresponding to a weight value of the corresponding subfield.
The address electrode driver 300 receives an address electrode driving control signal from the controller 200, and applies a display data signal for selecting a discharge cell to display to the address electrodes A1-Am. The scan electrode driver 400 receives a scan electrode driving control signal from the controller 200, and applies a driving voltage to the scan electrodes Y1-Yn. The sustain electrode driver 500 receives a sustain electrode driving control signal from the controller 200, and applies a driving voltage to the sustain electrodes X1-Xn.
Next, a PDP according to an exemplary embodiment of the present invention will be described with reference to FIG. 2.
FIG. 2 is a top plan view illustrating a portion of pixels and an electrode arrangement of a PDP according to an exemplary embodiment of the present invention.
As shown in FIG. 2, the PDP according to an exemplary embodiment of the present invention has a delta-type barrier rib structure. Each discharge cell is partitioned into an independent space by the delta-type barrier ribs (not shown), and one pixel 71 includes red, green, and blue subpixels 71R, 71G, 71B that form a triangle of the discharge cells and are arranged adjacent to each other. Because each of subpixels 71R, 71G, 71B has approximately a hexagonal shape, the barrier ribs (not shown) for partitioning the subpixels 71R, 71G, 71B (i.e., the discharge cells) also have a hexagonal shape.
That is, the PDP according to an exemplary embodiment of the present invention is a so-called delta-type PDP that forms one pixel with three subpixels for emitting red, green, and blue visible light arranged in a triangular shape. Two subpixels among the subpixels 71R, 71G, 71B are disposed in parallel and adjacent to each other in an x-axis direction, and this disposition forms a space that is suitable for a discharge by increasing a discharge space in an x-axis direction, thereby improving a margin. The two subpixels 71R, 71B correspond to one scan electrode (Yi+2).
Sustain electrodes (Xi-Xi+3) and scan electrodes (Yi-Yi+3) are formed in the x-axis direction. The sustain electrodes (Xi-Xi+3) and the scan electrodes (Yi-Yi+3) form a discharge gap corresponding to each other in each discharge cell (i.e., subpixel). The sustain electrodes (Xi-Xi+3) and the scan electrodes (Yi-Yi+3) are alternately arranged along the y-axis direction.
The address electrodes (Ai-Ai+11) are formed in the y-axis direction, and the address electrodes (Ai+9, Ai+10, Ai+11) are formed to pass through the subpixels 71R, 71G, 71B constituting one pixel 71, respectively.
In a PDP such as in an exemplary embodiment of the present invention, because centers of subpixels constituting one pixel form a triangle, readability is deteriorated when expressing characters.
Particularly, in a PDP such as in an exemplary embodiment of the present invention, centers of subpixels (71R, 71G, 71B in FIG. 2) constituting one pixel form a triangle and a direction of a side of the triangle is the same as that of a horizontal line (i.e., an x-axis direction) that is displayed in the PDP. Accordingly, when a black horizontal line or a white horizontal line of a character is expressed in the PDP, the horizontal line regularly touches a green subpixel and thus looks like a zigzag shape.
Hereinafter, when a different arrangement exists between the subpixels as described above, a method of improving the readability of a character will be described with reference to FIGS. 3 to 8.
In order to solve the problem, in an exemplary embodiment of the present invention, as shown in FIGS. 3A and 4A, video signal data of upper and lower pixels adjacent a black horizontal line or a white horizontal line of the displayed character are converted to video signal data that is cyan-biased (or green-biased) and video signal data that is magenta-biased as compared with the original video signal data, and the converted cyan-biased and magenta-biased data are alternately disposed in adjacent pixels, thereby processing an image.
As used herein, the cyan-biased video signal data has a stronger shade of cyan component of color as compared with the original video signal data, and the magenta-biased video signal data has a stronger shade of magenta component of color as compared with the original video signal data.
FIG. 3A is a view conceptionally illustrating a method of converting and alternately arranging video signal data of upper and lower pixels adjacent a black horizontal line to video signal data that is alternately cyan-biased and magenta-biased. FIG. 4A is a view conceptionally illustrating a method of converting and alternately arranging video signal data of upper and lower pixels adjacent a white horizontal line to video signal data that is alternately cyan-biased and magenta-biased. In FIGS. 3A and 4A, a portion that is indicated with oblique lines indicates a pixel displaying black, a portion that is not indicated with oblique lines indicates a pixel displaying white, a portion ‘M’ indicates a portion that is converted from original video signal data to video signal data that is magenta-biased, and a portion ‘C’ indicates a portion that is converted from original video signal data to video signal data that is cyan-biased.
As shown in FIGS. 3A and 4A, in an exemplary embodiment of the present invention, video signal data of upper and lower pixels adjacent a black horizontal line or a white horizontal line are converted to video signal data that is cyan-biased (C) and magenta-biased (M) as compared with original video signal data, and the converted cyan-biased and magenta-biased data are alternately disposed in adjacent pixels.
As shown in FIG. 3A, video signal data of an upper pixel of a black horizontal line are converted to video signal data that is cyan-biased (C) and magenta-biased (M) as compared with the original video signal data and the converted data are alternately disposed (i.e., in an arrangement of C-M-C-M along a horizontal line direction), and video signal data of a lower pixel of a black horizontal line are converted to video signal data that is magenta-biased (M) and cyan-biased (C) as compared with the original video signal data and the converted data are alternately disposed (i.e., in an arrangement of M-C-M-C along a horizontal line direction). FIG. 3A shows that cyan (C) and magenta (M) are alternately disposed in upper and lower pixels of a horizontal line. However, insofar as magenta (M) and cyan (C) are alternately disposed in a horizontal line direction, video signal data of upper and lower pixels of a horizontal line may be disposed as magenta (M) and magenta (M) or cyan (C) and cyan (C) (i.e., in an arrangement of M-M-C-C along a horizontal line).
As shown in FIG. 4A, as in the black horizontal line, even in a white horizontal line, video signal data of upper and lower pixels adjacent to the white horizontal line is converted to video signal data that is magenta-biased (M) and cyan-biased (C) as compared with the original video signal data. FIG. 4A shows that magenta (M) and cyan (C) or cyan (C) and magenta (M) are alternately disposed in upper and lower pixels of a horizontal line. However, insofar as magenta (M) and cyan (C) are alternately disposed in a horizontal line direction, video signal data of upper and lower pixels of a horizontal line may be disposed as magenta (M) and magenta (M) or cyan (C) and cyan (C) (i.e., in an arrangement of M-M-C-C along a horizontal line).
In an exemplary embodiment of the present invention, as shown in FIGS. 3B and 4B, video signal data of upper and lower pixels of a black vertical line or a white vertical line are converted to video signal data that is cyan-biased (or green-biased), and video signal data that is magenta-biased as compared with the original video signal data and the converted data are alternately disposed in adjacent pixels, thereby processing an image.
FIG. 3B is a view conceptionally illustrating a method of converting and alternately arranging video signal data of upper and lower pixels of a black vertical line to video signal data that is alternately cyan-biased and magenta-biased. FIG. 4B is a view conceptionally illustrating a method of converting and alternately arranging video signal data of upper and lower pixels of a white vertical line to video signal data that is alternately magenta-biased and cyan-biased. As shown in FIG. 3B, video signal data of upper and lower pixels adjacent to a black vertical line are converted to video signal data that is alternately cyan-biased (C) and magenta-biased (M) as compared with the original video signal data, and the converted data are disposed in the pixels. As shown in FIG. 4B, video signal data of upper and lower pixels adjacent to a white vertical line are converted to video signal data that is magenta-biased (M) and cyan-biased (C) as compared with the original video signal data and the converted data are disposed in the pixels.
Next, a method of converting original video signal data of upper and lower pixels adjacent to a black horizontal line, a white horizontal line, a black vertical line, or a white vertical line to video signal data that is magenta-biased or cyan-biased will be described in detail.
FIG. 5 is a partial block diagram of a controller of FIG. 1, and FIG. 6 is a view illustrating arrangement of each pixel in a pixel structure of the PDP as in FIG. 2. In FIG. 6, R (i, j), G (i, j), and B (i, j) indicate video signal data of red, green, and blue subpixels, respectively, in an i-th row and j-th column of a pixel (Pi,j).
As shown in FIG. 5, the controller 200 includes a rendering processor 210 and a feedback processor 220, and may further include an inverse gamma corrector (not shown) for performing inverse gamma correction of input image data.
The rendering processor 210 converts video signal data of upper and lower pixels of a black horizontal line, a white horizontal line, a black vertical line, or a white vertical line to video signal data that is magenta-biased or cyan-biased by mixing a predetermined ratio of upper or lower video signal data of a pixel in the input image data or data that are corrected by the inverse gamma corrector and performing a rendering process of the mixed data.
Next, a method of performing a rendering process in the rendering processor 210 is described in detail.
In the pixel arrangement of FIG. 6, in an i-th row and a j-th column of pixel (Pi,j), video signal data R(i, j), G(i, j), and B(i, j) are converted to video signal data R′(i, j), G′(i, j), and B′(i, j) by performing a rendering process in a method as in Equations 1 to 3.
R′(i, j)=R(i, j)×m/(m+n)+R(i+1, j)×n/(m+n) Equation 1
G′(i, j)=G(i, j)×m/(m+n)+G(i−1, j)×n/(m+n) Equation 2
B′(i, j)=B(i, j)×m/(m+n)+B(i+1, j)×n/(m+n) Equation 3
In Equations 1 to 3, m has a value greater than n, and m and n are values that are set considering an effect of adjacent upper and lower subpixels and are set to display an optimum image. Here, because m is a value greater than n, the converted video signal data are greatly influenced by the original video signal data.
As shown in Equation 1, the converted video signal data R′(i, j) is formed by combining original video signal data R (i, j) and R (i+1, j) in a predetermined ratio. That is, the video signal data R′(i, j) is influenced by video signal data R(i+1, j) of a red subpixel of a pixel of an (i+1)-th row, which is an adjacent row.
As shown in Equation 2, the converted video signal data G′(i, j) is formed by combining original video signal data G(i, j) and G(i−1, j) in a predetermined ratio. That is, unlike the video signal data R′(i, j), the video signal data G′(i, j) is influenced by video signal data G(i−1, j) of a green subpixel of a pixel of the (i−1)-th row, which is an adjacent row.
As shown in Equation 3, the converted video signal data B′(i, j) is formed by combining original video signal data B(i, j) and B(i+1, j) in a predetermined ratio. That is, the converted video signal data B′(i, j) is influenced by video signal data B(i+1, j) of a blue subpixel of a pixel of the (i+1)-th row, which is an adjacent row.
Next, in an i-th row and (j+1)-th column of pixel (Pi,j+1), video signal data R(i, j+1), G(i, j+1), B(i, j+1) are converted to video signal data R′(i, j+1), G′(i, j+1), B′(i, j+1) by performing a rendering processing in a method as in Equations 4 to 6.
R′(i, j+1)=R(i, j+1)×m/(m+n)+R(i−1, j+1) ×n/(m+n) Equation 4
G′(i, j+1)=G(i, j+1)×m/(m+n)+G(i+1, j+1)×n/(m+n) Equation 5
B′(i, j+1)=B(i, j+1)×m/(m+n)+B(i−1, j+1)×n/(m+n) Equation 6
In Equations 4 to 6, m has a value greater than n, and m and n are values that are set considering an effect of adjacent upper and lower subpixels and are set to display an optimum image. Referring to FIG. 6, because the subpixel arrangement of a (j+1)-th column of a pixel has a different order from the subpixel arrangement of a j-th column of a pixel, surrounding subpixels are affected differently, as shown in Equations 4 to 6.
As shown in Equation 4, the converted video signal data R′(i, j+1) is formed by combining original video signal data R(i, j+1) and R(i−1, j+1) in a predetermined ratio. That is, the converted video signal data R′(i, j+1) are influenced by video signal data R(i−1, j+1) of a red subpixel of a pixel of the (i−1)-th row, which is an adjacent row.
As shown in Equation 5, the converted video signal data G′(i, j+1) is formed by combining original video signal data G(i, j+1) and G(i+1, j+1) in a predetermined ratio. That is, unlike the video signal data R′(i, j+1), the video signal data G′(i, j+1) is influenced by video signal data G(i+1, j+1) of a green subpixel of a pixel of the (i+1)-th row, which is an adjacent row.
As shown in Equation 6, the converted video signal data B′(i, j+1) is formed by combining original video signal data B(i, j+1) and B(i−1, j+1) in a predetermined ratio. That is, the video signal data B′(i, j+1) is influenced by video signal data B(i−1, j+1) of a blue subpixel of a pixel of the (i−1)-th row, which is an adjacent row.
FIGS. 7A and 7B are views illustrating an example in which a rendering method according to an exemplary embodiment of the present invention is applied to a predetermined video signal data. FIG. 7A is a view illustrating a case of applying Equations 1 to 6 to video signal data for displaying a black horizontal line, and FIG. 7B is a view illustrating a case of applying Equations 1 to 6 to video signal data for displaying a white horizontal line. In FIGS. 7A and 7B, values within parentheses display video signal data of a red subpixel, a green subpixel, and a blue subpixel in order. It is assumed that m=2 and n=1 in Equations 1 to 6. In FIGS. 7A and 7B, the converted data for pixels Pi−2,j, Pi−2,j+1, Pi+2,j, Pi+2,j+1 are determined by adjacent pixels and thus are not displayed for convenience.
Referring to FIG. 7A, if Equations 1 to 3 are applied to video signal data of a pixel Pi−1,j, Pi−1,j=255, 255, 255 are converted to P′i−1,j=170, 255, 170, and if Equations 4 to 6 are applied to video signal data of a pixel Pi+1,j+1, Pi+1,J+1=255, 255, 255 are converted to P′i+1,j+1=170, 255, 170. That is, in the pixels Pi−1,j, Pi+1,j+1, original video signal data are converted to video signal data that is cyan-biased. In general, when original video signal data are converted to video signal data that is cyan-biased, an average ((ΔR+ΔB)/2) of a change amount of video signal data of red and blue subpixels is greater than a change amount (ΔG) of video signal data of a green subpixel. In other words, when video signal data of red and blue subpixels decrease or video signal data of a green subpixel increase, original video signal data are converted to video signal data that is cyan-biased. In pixels of Pi−1,j, Pi+1,j+1, because video signal data of red and blue subpixels become smaller than original video signal data, original video signal data are converted to video signal data that is cyan-biased.
If Equations 4 to 6 are applied to video signal data of a pixel Pi−1,j+1, Pi−1,j+1=255, 255, 255 are converted to P′i−1,j+1=255, 170, 255, and if Equations 1 to 3 are applied to video signal data of a pixel Pi+1,j, Pi+1,j=255, 255, 255 are converted to P′i+1,j=255, 170, 255. That is, in pixels Pi−1,j+1, Pi+1,j, original video signal data are converted to video signal data that is magenta-biased. In general, when original video signal data are converted to video signal data that is magenta-biased, a change amount (ΔR+ΔB/2) of video signal data of red and blue subpixels is smaller than a change amount (ΔG) of video signal data of a green subpixel. In other words, when video signal data of a green subpixel decreases or video signal data of red and blue subpixels increase, original video signal data are converted to video signal data that is magenta-biased. In pixels of Pi−1,j+1, Pi+1,j, because video signal data of a green subpixel decrease, original video signal data are converted to video signal data that is magenta-biased.
If Equations 1 to 3 are applied to video signal data of the pixel Pi,j, Pi,J=0, 0, 0 are converted to P′i,j=85, 85, 85, and if Equations 4 to 6 are applied to video signal data of the pixel Pi,j+1, Pi,j+1=0, 0, 0 are converted to P′i,j+1=85, 85, 85. That is, a color of video signal data of pixels Pi,j, Pi,j+1 corresponding to a black horizontal line is not converted and only a luminance level thereof is converted from black to light black.
Referring to FIG. 7B, if Equations 1 to 3 are applied to video signal data of the pixel Pi−1,j, Pi−1,j=0, 0, 0 are converted to P′i,j−1=85, 0, 85, and if Equations 4 to 6 are applied to video signal data of the pixel Pi+1,j+1, Pi+1,j+1=0, 0, 0 are converted to P′i+1,j+1=85, 0, 85. That is, in pixels Pi−1,j, Pi+1,j+1, original video signal data are converted to video signal data that is magenta-biased. In pixels Pi−1,j, Pi+1,j+1, because video signal data of red and blue subpixels become greater than that of original video signal data, the original video signal data are converted to video signal data that is magenta-biased.
If Equations 4 to 6 are applied to video signal data of the pixel Pi−1,j+1, Pi−1,j+1=0, 0, 0 are converted to P′i−1,j+1=0, 85, 0, and if Equations 1 to 3 are applied to video signal data of the pixel Pi+1,j, Pi+1,j=0, 0, 0 are converted to P′i+1,j=0, 85, 0. That is, in pixels Pi−1,j+1, Pi+1,j, original video signal data are converted to video signal data that is cyan-biased. In pixels Pi−1,j+1, Pi+1,j, because video signal data of a green subpixel increase, original video signal data are converted to video signal data that is cyan-biased.
If Equations 1 to 3 are applied to video signal data of the pixel Pi,j, Pi,j=255, 255, 255 are converted to P′i,j=170, 170, 170, and if Equations 4 to 6 are applied to video signal data of the pixel Pi,j+1, Pi,j+1=255, 255, 255 are converted to P′i,j+1=170, 170, 170. A color of video signal data of pixels Pi,j, Pi,j+1 corresponding to a white horizontal line is not converted and only a luminance level thereof is converted from white to dark white.
As shown in FIGS. 7A and 7B, when a rendering method is applied according to an exemplary embodiment of the present invention, video signal data of upper and lower pixels adjacent to a black horizontal line or a white horizontal line are converted to video signal data that is magenta-biased or cyan-biased. Accordingly, when a rendering method according to an exemplary embodiment of the present invention is applied, a problem that a black horizontal line or a white horizontal line looks like a zigzag shape can be solved.
However, when a rendering method is applied, a color of a pixel corresponding to a black horizontal line is not converted but the color is converted to light black and a color of a pixel corresponding to a white horizontal line is also not converted but the color is converted to dark white. Accordingly, visibility of a black horizontal line or a white horizontal line is deteriorated.
In order to solve deterioration of visibility, a feedback processor 220 of FIG. 5 reconverts video signal data of portions corresponding to a black horizontal line or a white horizontal line to original video signal data. The feedback processor 220 obtains a dispersion of original video signal data of each pixel and a dispersion of the converted video signal data of each pixel and then determines whether to convert the converted video signal data to original video signal data according to a degree of a change amount of the dispersion. That is, when a dispersion of the converted video signal data is equal to or smaller than a dispersion of original video signal data, the feedback processor 220 reconverts the converted original video signal data to the original video signal data. Here, a dispersion of video signal data of each pixel means a dispersion between video signal data of subpixels (i.e., red, green, and blue subpixels) of each pixel.
As shown in FIG. 7A, video signal data of pixels (i.e., Pi,j, Pi,j+1) corresponding to the black horizontal line are converted from Pi,j, Pi,j+1=0, 0, 0 to P′i,j, P′i,j+1=85, 85, 85 by the rendering processor 210. Because a dispersion of data 0, 0, 0 is 0 and a dispersion of data 85, 85, 85 is 0, a dispersion change amount of pixels Pi,j, Pi,j+1 is 0. Accordingly, as shown in FIG. 8A, P′i,j, P′i,j+1=85, 85, 85 are reconverted to P″i,j, P″i,j+1=0, 0, 0 by the feedback processor 220. In FIG. 7A, in the remaining pixels, because a dispersion of the converted video signal data becomes greater than that of original video signal data, the converted video signal data are not reconverted to original video signal data as shown in FIG. 8A.
Referring to FIGS. 7B and 8B, in pixels (i.e., Pi,j, Pi,j+1) corresponding to a white horizontal line, because a dispersion (i.e., 0) of the converted video signal data is equal to a dispersion (i.e., 0) of original video signal data, in a pixel corresponding to a white horizontal line, data 170, 170, 170 are reconverted to original video signal data 255, 255, 255. In FIG. 7B, because a dispersion of the converted video signal data becomes greater than that of original video signal data in the remaining pixels, the converted video signal data are not reconverted to original video signal data as shown in FIG. 8B.
The feedback processor 220 can use the mixed data by mixing video signal data that are converted by the rendering processor 210 and original video signal data using a weight value according to a degree of a change amount of a dispersion.
FIG. 8A is a view illustrating final video signal data of the video signal data as in FIG. 7A, and FIG. 8B is a view illustrating final video signal data of the video signal data as in FIG. 7B. As shown in FIG. 8A, in the video signal data as in FIG. 7A, cyan and magenta are alternately arranged in pixels around a black horizontal line. As shown in FIG. 8B, in the video signal data as in FIG. 7B, magenta and cyan are alternately arranged in pixels around a white horizontal line. That is, video signal data are converted as in FIGS. 3A and 4A by the rendering processor 210 and the feedback processor 220.
In the black vertical line and the white vertical line, if Equations 1 to 6 are applied by the rendering processor 210 and a processing is performed by the feedback processor 220, video signal data are converted as in FIGS. 3B and 4B.
In image processing data that are processed by the rendering processor 210 and the feedback processor 220, a phenomenon that horizontal lines looks like a zigzag shape can be prevented even in a structure in which centers of the subpixels form a triangle as in a PDP according to an exemplary embodiment of the present invention. Accordingly, visibility and readability of a character can be increased.
In an exemplary embodiment of the present invention, an image processing method of increasing visibility and readability of a character in a structure of a PDP in which centers of subpixels form a triangle and a shape of a discharge cell (i.e., a subpixel) is a hexagonal plane shape is described. However, the present invention can be applied to a structure of a PDP in which a shape of one discharge cell, in which centers of subpixels form a triangle, is a rectangular flat shape or has other shapes.
In an exemplary embodiment of the present invention, an image processing method of increasing visibility and readability of a character in a plasma display device including a PDP in which centers of subpixels form a triangle is described. However, the present invention can be applied to other display devices, for example a liquid crystal device (LCD) and a field emission device (FED) in which centers of subpixels form a triangle.
According to an exemplary embodiment of the present invention, visibility and readability of a character can be increased by converting video signal data of upper and lower pixels adjacent to a black line or a white line to video signal data having a magenta-biased or cyan-biased color.
While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Patent Application
20070279354
