JP2005315960A - Color image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color image display apparatus in which coloring in the end portion of a display region is improved. <P>SOLUTION: The color image display apparatus has a display region composed of pixels having a plurality of colors. The display region has a first display region composed of pixels (center pixels 2) having a plurality of colors, arranged according to a preliminarily determined rule, and an end region disposed at the end of the display region, the end region having pixel lines composed of a plurality of end pixels 1 smaller than the center pixels 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a color image display device, and more particularly to a color image display device in which the color pixel array structure at the end of the display region is changed from the central portion of the display region.

  There are various color image display devices that perform color display using unit pixels of a plurality of colors, such as a liquid crystal display (LCD), a plasma display (PDP), a field emission display (FED), and an organic EL display. A representative example of a combination of a plurality of colors of unit pixels for performing color display is a combination of three colors of R (Red), G (Green), and B (Blue) which are the three primary colors of light.

  As an arrangement method of RGB pixels in these color image display devices, there are a stripe arrangement, a delta arrangement, a mosaic arrangement, and the like. These are shown in FIG. The R, G, and B cells in the figure represent Red, Green, and Blue pixels, respectively. The stripe arrangement shown in FIG. 5A is an arrangement in which R, G, and B pixels are sequentially arranged in the horizontal direction, and R, G, and B pixels are arranged in the vertical direction. The delta arrangement shown in FIG. 5B has a configuration in which even-numbered rows and odd-numbered rows have a positional relationship that is shifted by a certain distance in the horizontal direction. An array with a triangular positional relationship across rows. In the mosaic arrangement shown in FIG. 5C, for example, the first row is repeated in the order of R, G, and B, the second row is repeated in the order of G, B, and R, and the third row is repeatedly arranged in the order of B, R, and G. It is a thing. These arrays are properly used according to the resolution and application of the color display device.

The pixel arrangement in the display area of the color image display device is an important element for determining the image quality. By devising the pixel arrangement, a technique for improving the image quality and a reduction in manufacturing cost without reducing the image quality are aimed at. Techniques and the like have been conventionally proposed (see, for example, Patent Documents 1 and 2).
JP-A-10-293285 JP 2003-5673 A

  In a color image display device having a pixel arrangement such as a stripe arrangement or a delta arrangement in which the edge of the display area is a pixel arrangement of only one color or two colors, the edge of the display area with a small number of colors is colored on the human eye Therefore, there is a problem that the image quality at the edge of the display area is lowered.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a color image display device in which coloring at the edge of a display area is improved.

  A color image display device according to the present invention is a color image display device including a display region composed of pixels of a plurality of colors, and the display region is composed of pixels of a plurality of colors arranged according to a predetermined rule. A first display region that is configured; and an end region that includes a pixel column that is arranged at an end of the display region and includes a plurality of end pixels that are smaller than the pixels in the first display region. Is. With such a configuration, the spatial resolution at the edge of the display area can be improved, so that deterioration in image quality due to coloring can be improved.

  Here, when the first display area is composed of first pixels having the same shape, each of the plurality of end pixels is arranged at a pixel column end arranged in the scanning direction of the display area, Each of the plurality of end pixels preferably has the same shape and a shape obtained by dividing the first pixel in a direction substantially perpendicular to the scanning direction.

  Here, the scanning direction means a direction scanned (scanned) by a scanning line when an image is displayed in the display area of the color image display device. For example, in the case of a CRT display, a horizontal line scanned by an electron gun is a scanning direction, and in the case of a TFT (Thin Film Transistor) liquid crystal display, a gate electrode line corresponding to a TFT element corresponds to a scanning line. The direction in which the lines are wired corresponds to the scanning direction.

  With such a configuration, even when the pixels at the edge of the display area are made smaller, it is not necessary to increase the number of scanning lines, so that a color image display device that reduces coloring and improves image quality and is easy to manufacture is provided. can do.

  The end pixels may be arranged according to the arrangement rule of the first display area. With such a configuration, the RGB spatial arrangement at the edge of the display area can be made closer to uniform, so that coloring can be further suppressed and image quality can be improved.

Furthermore, the end region is composed of end pixels of a plurality of colors, and the end region is composed of a plurality of pixel rows arranged in a direction substantially perpendicular to the scanning direction of the display region. Good. With such a configuration, the spatial resolution of the end region can be further improved, and the spatial arrangement of RGB can be made more uniform, thereby suppressing the coloring at the end of the display region and improving the image quality.

  When the first display area is composed of pixels of three colors according to a delta arrangement, the end area is an end of one row arranged in a direction substantially perpendicular to the scanning direction. It is good also as comprising only a pixel column. With such a configuration, even when there are few pixels to be reduced at the edge of the display area, coloring can be reduced and image quality can be improved.

  The end pixels are preferably arranged in units of three end pixels of three colors. With such a configuration, since the RGB spatial arrangement can be made closer to uniform, coloration can be further suppressed and image quality can be improved.

Furthermore, the first display area is composed of first pixels having the same shape,
The unit pixel shape may be the same shape as the first pixel. With such a configuration, RGB three-color pixels can be efficiently arranged at the end of the display area.

  According to the present invention, it is possible to provide a color image display device in which coloring at the edge of the display area is improved.

Embodiment 1 of the Invention
FIG. 1 shows a color image display device having a display area with a delta arrangement in which RGB pixels are sequentially and repeatedly arranged in the horizontal direction. The pixel arrangement in the case of having a size of 1/3 of the pixel (center pixel 2) is shown. Each cell of R, G, and B in the figure represents a pixel of Red, Green, and Blue, respectively. FIG. 1A shows a left end portion of a display area in which pixels are arranged in a delta arrangement. In the left end portion, three RGB pixels are arranged in a horizontal direction in an area corresponding to the size of one pixel of the central pixel 2. The end pixels 1 are formed by allocating them to each other. Here, the pixel size of the end pixel 1 is a size obtained by dividing the central pixel 2 into three in the vertical direction. FIG. 1B shows the left end portion of the display area in which the pixels are delta-arranged, as in FIG. 1A, and the left end portion has an area corresponding to the size of one pixel of the central pixel 2. The end pixel 1 is formed by arranging three RGB pixels side by side in the vertical direction. The pixel size of the end pixel 1 shown in FIG. 1B is a size obtained by dividing the central pixel 2 into three in the horizontal direction.

  As shown in FIG. 1A or FIG. 1B, the three colors of RGB are arranged as end pixels 1 at the end of the display area, so that the spatial arrangement of the three colors of RGB becomes uniform. Here, it is desirable that the RGB arrangement order of the end pixels 1 is an order according to the horizontal arrangement order of the central pixels 2 as shown in FIG. This is because the spatial arrangement of RGB can be made even more uniform. Furthermore, the end pixel 1 can be arranged according to the same arrangement rule as the central pixel 2 by setting the end pixel 1 to one third of the size of the central pixel 2.

  As described above, by arranging small pixels at the end of the display area, all the three colors of RGB are arranged in the pixel arrangement at the end of the display area, so that coloring can be improved and image quality can be improved. Furthermore, by arranging small pixels, the spatial resolution of each color is improved, and it is difficult for the human eye to recognize the roughness of the pixels. Specifically, in FIGS. 1A and 1B, the spatial resolution at the left and right ends is improved three times as compared with the central portion. With such a pixel arrangement, coloring at the edge of the display area can be suppressed and image quality can be improved.

  In view of ease of manufacturing and manufacturing cost, the arrangement of FIG. 1A is preferable to the arrangement of FIG. The reason is as follows. For example, when the color image display device according to the present invention is a color TFT liquid crystal display, scanning lines (gate electrode lines) are wired in the horizontal direction, and signal lines (source electrode lines) are wired in the vertical direction. For this reason, in the case of FIG. 1A, it is only necessary to newly provide three vertical signal lines on the left and right for the small pixels at the left and right ends, whereas in the case of FIG. Therefore, it is necessary to increase the number of scanning lines in the horizontal direction with respect to small pixels at both the left and right ends. The number of scanning lines in the case of FIG. 1B increases three times as compared with the case where the pixels are not reduced, and the scanning lines need to be routed through the center of the display area with respect to the left and right ends. . For this reason, the arrangement of FIG. 1A is easier to manufacture than the arrangement of FIG. 1B, and the manufacturing cost can be reduced.

  The method for forming the pixel array described above in the display area of the color image display device is the same as the conventional method, and can be formed by the following method, for example. When the color image display device is a liquid crystal display, when the RGB color material film is formed on the glass substrate in the color filter of the display region, the RGB color material film is formed so as to have the pixel arrangement described above. In this case, each pixel may be driven. The color material film can be formed by a conventional method such as an etching method, a color resist method, or a printing method.

  Further, when the color image display device is an organic EL display, when the light emitting layers of each color of RGB are formed in the light emitting portion, the pixel array may be formed so as to have the above-described pixel arrangement, and each pixel may be driven. . In addition, formation of a light emitting layer can be performed by the conventional method (for example, vacuum evaporation method).

  Further, when the color image display device is a PDP (plasma display panel), cells separated by partition walls are formed so as to have the pixel arrangement described above, and a phosphor is applied to the inside of the cell according to the pixel arrangement described above. A panel may be formed and each pixel may be driven.

Embodiment 2 of the Invention
FIG. 2 shows a color image display device in which pixels are arranged in a delta arrangement, in which the pixel at the edge of the display area (edge pixel 1) is half the size of the pixel at the center of the display area (center pixel 2). The pixel arrangement in this case is shown. FIG. 2 shows the left end portion of the display area arranged in a delta arrangement. In the left end portion, an area corresponding to the size of one pixel of the central pixel 2 is different from the color of the central pixel 2 adjacent to the right side. The end pixel 1 is formed by arranging the color pixels side by side in the horizontal direction. Also in this case, since the RGB spatial arrangement can be made close to each other, it is desirable that the color arrangement conforms to the horizontal RGB arrangement order of the central pixel 2 as shown in FIG. Even with such a pixel arrangement, the spatial resolution of each color at the edge of the display area can be improved and a pixel arrangement in which all three colors of RGB are aligned at the edge of the display area can be achieved. Can be improved.

Embodiment 3 of the Invention
FIG. 3 shows a color image display device in which pixels are arranged in a delta arrangement, in which the pixel at the end of the display area (end pixel 1) is ¼ the size of the pixel at the center of the display area (center pixel 2). The pixel arrangement in this case is shown. FIG. 3 shows the left end portion of the display area arranged in a delta arrangement. In the left end portion, an area corresponding to the size of one pixel of the central pixel 2 is different from the color of the central pixel 2 adjacent to the right side 2. The edge pixel 1 is formed by arranging and assigning color pixels in a grid pattern. Even with such a pixel arrangement, the spatial resolution of each color at the edge of the display area can be improved and a pixel arrangement in which all three colors of RGB are aligned at the edge of the display area can be achieved. Can be improved.

Embodiment 4 of the Invention
FIG. 4A shows the arrangement of the end pixel 1 in the color image display device according to the first embodiment of the invention described with reference to FIG. One pixel is changed to the arrangement of only one column in the vertical direction. Here, it is desirable that the RGB arrangement order of the end pixel 1 is an order according to the arrangement order of the central pixel 2. This is because the color of the end pixel 1 is different from the color of the adjacent pixel, and the spatial arrangement of RGB can be made closer to each other. In a color image display device in which the central pixel 2 has a delta arrangement, such a pixel arrangement also improves the spatial resolution of each color at the edge of the display area and improves the balance of RGB three colors at the edge of the display area. Therefore, coloring at the edge of the display area can be suppressed and image quality can be improved.

  FIG. 4B shows a color image display device according to the second embodiment of the present invention described with reference to FIG. 2, in which the arrangement of the end pixel 1 is changed from an arrangement in units of two pixels of RGB to one pixel. The unit is changed to the arrangement of only one column in the vertical direction. Here, it is desirable that the RGB arrangement order of the end pixel 1 is an order according to the arrangement order of the central pixel 2. This is because the color of the end pixel 1 is different from the color of the adjacent pixel, and the spatial arrangement of RGB can be made closer to each other. In a color image display device in which the central pixel 2 has a delta arrangement, even with such a pixel arrangement, the spatial resolution of each color at the edge of the display area is improved, and a pixel arrangement in which all three RGB colors are aligned at the edge of the display area. Therefore, coloration at the edge of the display area can be suppressed and image quality can be improved.

  In Embodiments 1 to 4 described above, the case of a color image display device having a delta arrangement has been described. However, other color images having a pixel arrangement in which the display region ends have one color or two colors as in a stripe arrangement. The same effect can be achieved in the display device. For example, in a color image display device having a stripe arrangement, when the resolution is low, coloring at the left and right ends of the display area becomes particularly noticeable, so the present invention is effective. Furthermore, in the first to fourth embodiments described above, an example in which a display area is configured by pixels of three colors of RGB is shown. However, even in a display device that performs color display by a combination of pixels of other colors, the end of the display area Since the image quality may be deteriorated due to coloring in the portion, the present invention is effective also in these cases.

It is a figure which shows the pixel arrangement concerning Embodiment 1 of invention. It is a figure which shows the pixel arrangement | sequence concerning Embodiment 2 of invention. It is a figure which shows the pixel arrangement | sequence concerning Embodiment 3 of invention. It is a figure which shows the pixel arrangement concerning Embodiment 4 of invention. It is a figure which shows the example of the conventional pixel arrangement | sequence.

Explanation of symbols

R Red pixel, G Green pixel, B Blue pixel 1 End pixel, 2 Center pixel

Claims (7)

A color image display device comprising a display region composed of pixels of a plurality of colors, wherein the display region is
A first display area composed of pixels of a plurality of colors arranged according to a predetermined rule;
An end region that includes a pixel column that is disposed at an end of the display region and includes a plurality of end pixels that are smaller than the pixels in the first display region;
A color image display device. The first display area is composed of first pixels having the same shape,
Each of the plurality of end pixels is arranged at a pixel column end arranged in the scanning direction of the display area,
Each of the plurality of end pixels has the same shape, and is a shape obtained by dividing the first pixel in a direction substantially orthogonal to the scanning direction.
The color image display apparatus according to claim 1.   The color image display device according to claim 1, wherein the end pixels are arranged according to an arrangement rule of the first display area. The end region is composed of end pixels of a plurality of colors,
The end region is composed of a plurality of pixel columns arranged in a direction substantially orthogonal to the scanning direction of the display region.
The color image display apparatus as described in any one of Claim 1 to 3. The first display area is composed of pixels of three colors according to a delta arrangement,
The end region is composed of only one end pixel column arranged in a direction substantially orthogonal to the scanning direction.
The color image display apparatus according to claim 1.   The color image display device according to any one of claims 1 to 3, wherein the end pixels are arranged in units of three end pixels of three colors. The first display area is composed of first pixels having the same shape,
The shape of the unit of the end pixel is the same shape as the first pixel.
The color image display device according to claim 6.

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