JP4552508B2 - Display device, pixel arrangement method, and pixel arrangement program - Google Patents

Description

  The present invention relates to a display device, a pixel arrangement method, and a pixel arrangement program.

As a display device that expresses a color image, there is an apparatus that generates various colors by synthesizing three primary colors of red (R), green (G), and blue (B). A method of creating various desired colors in this way is called an additive color mixing method. Conventionally, a color liquid crystal display device has been devised which is formed by changing the area ratio of red (R), green (G), and blue (B) color filters to display desired white light. (For example, refer to Patent Document 1).
JP-A-8-84347

  However, since the conventional display device described in Patent Document 1 performs color reproduction with the three primary colors, it is difficult to sufficiently widen the color reproduction region as an actually manufactured display device. Further, the above-mentioned Patent Document 1 does not consider any technique regarding the display device of four primary colors. If the technique for changing the area ratio of each pixel of red (R), green (G), and blue (B) is simply applied to the display device of the four primary colors, various problems occur, and black stripes in the vertical direction occur. May appear and the image quality may deteriorate.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a display device, a pixel arrangement method, and a pixel arrangement program that are four primary color display devices that can display images with high image quality.
It is another object of the present invention to provide a display device, a pixel arrangement method, and a pixel arrangement program that are four primary color display devices that can reduce the appearance of black streaks in the vertical direction.
The present invention also provides a display device, a pixel arrangement method, and a pixel arrangement program that are four primary color display devices that can display a desired white color and reduce the occurrence of black streaks in the vertical direction. Objective.

In order to achieve the above object, a display device according to the present invention is a display device that performs color display by arranging a plurality of pixels of a set of four pixels corresponding to different colors. The two pixels having a small area in the four pixels are arranged so as not to be adjacent to each other.
According to the present invention, in a display device that displays an arbitrary color with four pixels forming four primary colors, the area of each pixel is different, so that white can be displayed with high accuracy, and a pixel with a small area (of the light shielding portion) can be displayed. Pixels having a large area) are arranged apart from each other. As a result, the present invention can also avoid recognizing black streaks (in the vertical direction) due to adjacently arranged pixels having a small area. Therefore, the present invention can realize a high-quality display device.

In order to achieve the above object, a display device according to the present invention is a display device that performs color display by arranging a plurality of pixels of a set of four pixels corresponding to different colors. Two pixels having low luminance in the four pixels are arranged so as not to be adjacent to each other.
According to the present invention, in a display device that displays an arbitrary color using four pixels forming four primary colors, each pixel has a different area, so that white can be displayed with high accuracy and a pixel with a low luminance (a light-shielding unit). Pixels having a large area) are arranged apart from each other. Accordingly, the present invention can also avoid recognizing black stripes (in the vertical direction) due to pixels having low luminance arranged adjacent to each other. Therefore, the present invention can realize a high-quality display device.

In the display device of the present invention, it is preferable that a plurality of the set of pixels is regularly arranged in a stripe arrangement.
According to the present invention, two pixels having a small area or two pixels having a small luminance are arranged adjacent to each other, and the two pixels having a small area (pixels having a large area of the light shielding portion) are arranged in the vertical direction of the display surface. It is possible to avoid being recognized as black stripes. Therefore, the present invention can realize a stripe-type display device and a high-quality display device.

In the display device of the present invention, it is preferable that a plurality of the set of pixels is regularly arranged in a mosaic arrangement.
According to the present invention, two pixels having a small area or two pixels having a low luminance are arranged adjacent to each other, and two pixels having a small area (pixels having a large area of the light-shielding portion) are obliquely arranged on the display surface. It is possible to avoid being recognized as black stripes. Therefore, the present invention can realize a high-quality display device that is a mosaic display device.

In addition, the display device of the present invention is preferably one of a liquid crystal display device, an organic EL display device, a plasma display device, and a cathode ray tube display device.
The present invention can be applied to various display devices that express colors by additive color mixing.

In order to achieve the above object, a pixel arrangement method of the present invention is a pixel arrangement method for determining an arrangement of four pixels included in a set of pixels and corresponding to different colors, and each of the four pixels. The area of each of the four pixels, which becomes a desired white color when the light of the four changed pixels is combined, is obtained, and two pixels having a smaller area in the four pixels are selected. The arrangement of the four pixels is determined so that the two selected pixels are not adjacent to each other.
According to the present invention, since the area of each of a set of four pixels is determined so that a desired white color can be displayed, a display device that can display a white color with high accuracy can be designed and manufactured. Further, according to the present invention, since the two pixels having a small area are arranged so as not to be adjacent to each other, it is possible to avoid a display device in which black stripes (in the vertical direction) are recognized. Therefore, according to the pixel arrangement method of the present invention, a high-quality display device can be designed and manufactured.

In order to achieve the above object, a pixel arrangement method of the present invention is a pixel arrangement method for determining an arrangement of four pixels included in a set of pixels and corresponding to different colors, and each of the four pixels. The luminance of each of the four pixels that becomes a desired white color when the light of the four changed pixels is synthesized is obtained, and two pixels having low luminance in the four pixels are selected. The arrangement of the four pixels is determined so that the two selected pixels are not adjacent to each other.
According to the present invention, since the area of each of a set of four pixels is determined so that a desired white color can be displayed, a display device that can display a white color with high accuracy can be designed and manufactured. Further, according to the present invention, since the two pixels having low luminance are arranged so as not to be adjacent to each other, it is possible to avoid a display device in which black stripes (in the vertical direction) are recognized. Therefore, according to the pixel arrangement method of the present invention, a high-quality display device can be designed and manufactured.

  In order to achieve the above object, a pixel arrangement program according to the present invention is a pixel arrangement program for determining the arrangement of four pixels included in a set of pixels and corresponding to different colors, and each of the four pixels. The areas of the four pixels are changed, and the areas of the four pixels that become the desired white color when the lights of the four changed pixels are combined are obtained, and two pixels having a smaller area in the four pixels are selected. It is characterized by causing a computer to execute a process and a process of determining an arrangement of the four pixels so that the selected two pixels are not adjacent to each other.

  In order to achieve the above object, a pixel arrangement program according to the present invention is a pixel arrangement program for determining the arrangement of four pixels included in a set of pixels and corresponding to different colors, and each of the four pixels. The luminance of each of the four pixels, which becomes a desired white color when the light of the four changed pixels is synthesized, is obtained, and two pixels having low luminance in the four pixels are selected. It is characterized by causing a computer to execute a process and a process of determining an arrangement of the four pixels so that the selected two pixels are not adjacent to each other.

  Hereinafter, a display device and a pixel arrangement method according to embodiments of the present invention will be described with reference to the drawings. This display device can be designed and manufactured using the pixel arrangement method according to the present invention.

(First embodiment)
FIG. 1 is a plan view showing the main part of the display device according to the first embodiment of the present invention. That is, FIG. 1 shows a planar arrangement of pixels in the display device 1 of the present embodiment. The display device 1 combines the four primary colors for color display. Specifically, the display device 1 includes four pixels of red (R), green (G), blue (B), and cyan (C) as a set of pixels 10, and a plurality of the sets of pixels 10 vertically and horizontally. Arranged regularly. The display device 1 is a stripe type in which a plurality of sets of pixels 10 are arranged on a straight line in the horizontal direction and a plurality of pixels are arranged on the straight line so that pixels of the same color are connected in the vertical direction. It is a display device. In addition, a black matrix 11 serving as a light shielding portion is arranged around four pixels of red (R), green (G), blue (B), and cyan (C).

  Further, in the display device 1, the area (opening area) of each of the four pixels is set so that when all the four RGBC pixels forming the set of pixels 10 emit light, the desired white color is obtained. Here, the desired white color is, for example, a color set on a black body locus in the chromaticity characteristics. In FIG. 1, the opening area A2 of the green G pixel is the same as the opening area A2 of the green B pixel, the opening area A2 of the green G pixel, the opening area A3 of the cyan C pixel, and the opening area A4 of the red R pixel. The opening area A4 of the red R pixel is set to be smaller than the opening area A1 of the blue B pixel and the opening area A3 of the cyan C pixel. In other words, A2 is smaller than A1 and smaller than A3, and A4 is smaller than A1 and smaller than A3. Other magnitude relationships may be specifically considered. Since the opening areas of the four RGBC pixels are set in this way, the set of pixels 10 can display a desired white color, and the display device 1 as a whole can also display a desired white color. The size relationship of the opening areas is merely an example, and any size relationship that can display a desired white color as the set of pixels 10 may be used.

  Further, in the display device 1, two small pixels Aa and Ab in the four pixels of the set of pixels 10 are arranged so as not to be adjacent to each other. In the example of FIG. 1, Aa = A2 and Ab = A4, so that the green G pixel (opening area A2) and the red R pixel (opening area A4) are not adjacent to each other, that is, the green G pixel and red R pixels are arranged apart from each other. A pixel having a large aperture area (that is, a blue B pixel and a cyan C pixel) other than the two small area pixels Aa and Ab may be arranged anywhere on the premise of the above condition.

  Here, the reason why the two pixels (Aa, Ab) having a small opening area are arranged apart from each other is that the thick black bands 11a, 11b formed by the black matrix 11 are not close to each other. As a result, the appearance of black streaks in the vertical direction in the display device 1 can be reduced.

  As a result, the display device 1 of the present embodiment has a pattern formed by four pixels of red (R), green (G), blue (B), and cyan (C) that form a set of pixels 10 and the black matrix 11. The pixels can be arranged with sufficient consideration for the vertical black streak, which is one of the factors determining the image quality. Therefore, the display device 1 of the present embodiment expands the range of colors that can be reproduced using the four primary colors, displays the desired white color with high accuracy by making the area of each pixel non-uniform, and has black streaks. An unrecognized high-quality image can be displayed. In general, the vertical black streak is more easily recognized by an observer as the display device has a lower resolution. Therefore, the effect of reducing the black streak is more remarkable in the display device 1 having a lower resolution.

(Pixel Arrangement Method of First Embodiment)
FIG. 2 is a flowchart illustrating a pixel arrangement method according to the first embodiment of the present invention. That is, FIG. 2 is a flowchart showing a procedure used when designing the display device 1 shown in FIG. Therefore, this flowchart is obtained when the aperture area of each pixel of red (R), green (G), blue (B), and cyan (C) in the set of pixels 10 is changed (with different areas). The procedure for determining the arrangement of each pixel is shown.

First, assuming that the aperture areas of four pixels (a set of pixels) of red (R), green (G), blue (B), and cyan (C) are the same area, the combined light of the four pixels in that state A white color evaluation process for evaluating white color is performed (step S1).
This white color evaluation process can be realized by predicting the emission spectrum characteristics from each pixel with the same aperture area of the four RGBC pixels and calculating the white color from the emission characteristics. Thus, by evaluating white by simulation, a desired evaluation can be performed more easily and quickly than in the case of making a prototype.

Next, while changing the aperture area of each RGBC pixel based on the white evaluation result in step S1, each of the RGBC pixels when the combined light of each RGBC pixel after the change becomes a desired white color The white adjustment process for obtaining the opening area (A1, A2, A3, A4) is performed (step S2).
In obtaining the aperture area in step S2, a combination when the aperture area is changed is prepared for each pixel, and white (synthetic light) is calculated for all of the prepared combinations. By selecting the combination closest to the desired white color in the calculation result, the area of each RGBC pixel that becomes the desired white color can be obtained.

Next, a selection process is performed to select the pixels Aa and Ab having two smaller areas in the aperture areas (A1, A2, A3, A4) of the RGBC pixels obtained in step S2 (step S3).
FIG. 3 shows candidates for selecting two small pixels Aa and Ab from each pixel of the opening area (A1, A2, A3, A4) in step S3. That is, FIG. 3 shows seven candidates that can be considered as combinations of the size relationships of the aperture areas of each pixel. Assume that the pixel indicated by the underline in FIG. 3 is selected as a pixel having a small aperture area. Further, when there are a plurality of the same opening area, any one may be selected. The selected result is two pixels Aa and Ab having a small opening area.

Finally, an arrangement process is performed in which the two pixels (Aa, Ab) having a small opening area selected in step S3 are separated, that is, arranged so that the pixels Aa and Ab are not adjacent to each other (step S4).
By step S4, other pixels (pixels other than the pixel Aa and the pixel Ab) are arranged between the pixel Aa and the pixel Ab.

Accordingly, in the design of the display device 1 shown in FIG. 1, the arrangement of the red (R), green (G), blue (B), and cyan (C) pixels having different opening areas is determined. Therefore, according to the pixel arrangement method of the present embodiment, the display device 1 that can display white with high accuracy, can also prevent the vertical black stripes from being recognized, and can display a high-quality color image. Can be designed and manufactured.
In the pixel arrangement method of the above-described embodiment, an example in which the pixel arrangement is calculated by simulation using a computer or the like has been shown. Actually, a display device in each state is prototyped and emission characteristics are measured for each display device. By doing so, it is also possible to determine the pixel arrangement as shown in FIG.

(Second Embodiment)
FIG. 4 is a plan view showing a main part of a display device according to the second embodiment of the present invention. That is, FIG. 4 shows a planar arrangement of pixels in the display device 2 of the present embodiment. Similar to the display device 1 of the first embodiment, the display device 2 combines the four primary colors for color display. However, in the display device 2 according to the present embodiment, two low luminance pixels Ya and Yb are selected from the four primary color pixels, and the low luminance pixels Ya and Yb are arranged apart from each other. However, it is different from the display device 1 of the first embodiment.

  Specifically, the display device 2 uses four pixels of red (R), green (G), blue (B), and cyan (C) as a set of pixels 20, and the set of pixels 20 is vertically and horizontally arranged. Arranged regularly. The display device 2 has a stripe type in which a plurality of sets of pixels 20 are arranged on a straight line in the horizontal direction and a plurality of pixels are arranged on the straight line so that pixels of the same color are connected in the vertical direction. It is a display device. Further, a black matrix 21 serving as a light shielding portion is arranged around four pixels of red (R), green (G), blue (B), and cyan (C).

  Further, in the display device 2, the area (opening area) of each of the four pixels is set so that when all the four RGBC pixels forming the set of pixels 20 emit light, the desired white color is obtained. Here, the desired white color is, for example, a color set on a black body locus in the chromaticity characteristics. In FIG. 4, the blue B pixel, the green G pixel, and the red R pixel have substantially the same opening area, and the opening area of cyan C is made smaller than these pixels. Since the opening areas of the four RGBC pixels are thus set, the set of pixels 20 can display a desired white color, and the display device 2 as a whole can also display a desired white color. The size relationship of the opening areas is merely an example, and any size relationship may be used as long as a desired white color can be displayed as the set of pixels 20.

  Comparing the luminances Y1, Y2, Y3, and Y4 of each of the blue (B), green (G), cyan (C), and red (R) pixels with the aperture areas set in this way, the aperture area of cyan C is the other. Therefore, the luminance Y3 of cyan C is the smallest. The aperture areas of the blue B, green G, and red R pixels are almost the same, but since the luminance of blue B is small, the luminance Y1 of blue B is the second lowest. Of the four primary color pixels, blue B and cyan C pixels are selected as the two low luminance pixels Ya and Yb, and the low luminance pixels Ya and Yb are arranged apart from each other. That is, the pixels Ya and Yb having low luminance are arranged so as not to be adjacent to each other. The magnitude relationship between the brightness of the pixels other than the two low brightness pixels Ya and Yb, that is, green G and red R, may be particularly considered. Therefore, it is assumed that the green G and red R pixels may be arranged anywhere assuming the above conditions.

  Here, the reason why the two low-luminance pixels Ya and Yb are arranged apart from each other is to reduce the occurrence of black streaks in the vertical direction in the display device 2 by arranging the low-luminance pixels so as not to approach each other. is there.

  Accordingly, the display device 2 of the present embodiment arranges each pixel in consideration of the pattern formed by the black matrix 21 and the luminances Y1, Y2, Y3, and Y4 of each pixel in the set of pixels 20. Therefore, it is possible to reduce vertical black streaks, which is one of the factors that determine image quality. Therefore, the display device 2 of the present embodiment expands the range of colors that can be reproduced using the four primary colors, can display the desired white color with high accuracy by making the area of each pixel non-uniform, and has black streaks. An unrecognized high-quality image can be displayed. In general, the vertical black streak is more easily recognized by an observer as the display device has a lower resolution. Therefore, the effect of reducing the black streak is more remarkable in the display device 2 having a lower resolution.

(Pixel Arrangement Method of Second Embodiment)
FIG. 5 is a flowchart showing a pixel arrangement method according to the second embodiment of the present invention. That is, FIG. 5 is a flowchart showing a procedure used when designing the display device 2 shown in FIG. Accordingly, this flowchart is obtained when the aperture area of each pixel of red (R), green (G), blue (B), and cyan (C) in the set of pixels 20 is changed (with different areas). The procedure for determining the arrangement of each pixel is shown.

First, assuming that the aperture areas of four pixels (a set of pixels) of red (R), green (G), blue (B), and cyan (C) are the same area, the combined light of the four pixels in that state A white color evaluation process for evaluating white color is performed (step S11).
This white evaluation can be performed in the same manner as the specific method of step S1 of the first embodiment.

Next, based on the white evaluation result in step S11, the aperture area of each RGBC pixel is changed, and each RGBC pixel when the combined light of each RGBC pixel after the change becomes a desired white color A white adjustment process for obtaining the opening area (A1, A2, A3, A4) is performed (step S12).
This step S12 can be executed in the same manner as the specific method of step S2 of the first embodiment.

Next, the luminances Y1, Y2, Y3, Y4 of the four pixels reflecting the aperture area obtained in step S12 are obtained (step S13).
The determination of the luminance in step S13 can be executed by calculation such as integration calculation.

Next, a selection process is performed to select two pixels (Ya, Yb) having a small luminance among the four pixels obtained in step S3 (step S14).
FIG. 6 shows candidates for selecting two low luminance pixels Ya and Yb from the luminances Y1, Y2, Y3, and Y4 of the four pixels in step S14. That is, FIG. 6 shows seven candidates that can be considered as combinations of the magnitude relations of the luminance of each pixel. The luminance indicated by the underline in FIG. 6 is selected as a small luminance. In addition, when there are a plurality of the same luminance, any one may be selected. Then, the selected result is two pixels Ya and Yb having low luminance.

Finally, an arrangement process is performed in which the two low-luminance pixels Ya and Yb selected in step S14 are separated so that the pixels Ya and Yb are not adjacent to each other (step S15).
By step S15, another pixel (a pixel other than the pixel Ya and the pixel Yb) is arranged between the pixel Ya and the pixel Yb.

Accordingly, in the design of the display device 2 shown in FIG. 4, the arrangement of each pixel of red (R), green (G), blue (B), and cyan (C) having different opening areas has the luminance of each pixel. Decided in consideration. Therefore, according to the pixel arrangement method of the present embodiment, the display device 1 that can display white with high accuracy, can also prevent the vertical black stripes from being recognized, and can display a high-quality color image. Can be designed and manufactured.
In the pixel arrangement method of the above-described embodiment, an example in which the pixel arrangement is calculated by simulation using a computer or the like has been shown. Actually, a display device in each state is prototyped and emission characteristics are measured for each display device. By doing so, it is also possible to determine the pixel arrangement as shown in FIG.

(Application examples)
FIG. 7 is a plan view showing an application example of the display device according to the first embodiment. The display device 1 of the first embodiment is a stripe-type display device in which pixels of the same color are arranged in the vertical direction, but the display device 3 of this application example is a mosaic type in which pixels of the same color are shifted and arranged in the vertical direction. As a display device.

  That is, the display device 3 shown in FIG. 7 uses four pixels of red (R), green (G), blue (B), and cyan (C) as a set of pixels 30 and sets the set of pixels 30 vertically and horizontally. Are arranged regularly. In the display device 3, a plurality of sets of pixels 30 are arranged on a straight line in the horizontal direction, and the mosaic type is a pixel arrangement that shifts to the right by one color when one line is lowered in the vertical direction. It is a display device. In addition, a black matrix 31 serving as a light shielding portion is disposed around four pixels of red (R), green (G), blue (B), and cyan (C).

  In the display device 3, the RGBC pixels forming the set of pixels 30 are separated from the pixels Aa and Ab having a small opening area, similarly to the pixels of the set of pixels 10 in the display device 1 shown in FIG. (Not to be next to each other).

  According to this application example, it is possible to reduce the recognition of vertical black streaks, which is one of the image quality determining factors, in the mosaic display device, and it is possible to realize a high-quality display device. In other words, the vertical stripe pattern is less noticeable in the mosaic type display device than in the stripe type display device, but the display device 3 of this application example displays a higher quality color image than the conventional mosaic type display device. can do.

  FIG. 8 is a plan view showing another application example of the display device according to the first embodiment. The display device 4 of this application example is an example in which the display device according to the first embodiment is applied to a mosaic type display device, similarly to the display device 3 shown in FIG. However, the display device 4 of this application example is different from the display device 3 in that the display device 4 has a pixel arrangement that shifts to the right by two colors when one line is lowered in the vertical direction. Other configurations and effects of the display device 4 are the same as those of the display device 3.

  Specifically, the display device 4 illustrated in FIG. 8 includes four pixels of red (R), green (G), blue (B), and cyan (C) as a set of pixels 40, and the set of pixels. 40 is regularly arranged vertically and horizontally. In the display device 4, a set of pixels 40 is arranged in a plurality of lines on a horizontal line, and a mosaic type pixel arrangement that shifts to the right by two colors when one line is lowered in the vertical direction. It is a display device. Further, a black matrix 41 serving as a light shielding portion is arranged around four pixels of red (R), green (G), blue (B), and cyan (C).

  In the display device 4, the RGBC pixels forming the set of pixels 40 are separated from the pixel Aa and the pixel Ab having a small opening area, similarly to the pixels of the set of pixels 10 in the display device 1 shown in FIG. 1. (Not to be next to each other).

  According to this application example, it is possible to reduce the recognition of vertical black streaks, which is one of the image quality determining factors, in the mosaic display device, and it is possible to realize a high-quality display device. In other words, the vertical stripe pattern is less noticeable in the mosaic type display device than in the stripe type display device, but the display device 4 of this application example displays a higher quality color image than the conventional mosaic type display device. can do.

(About the effect of the present invention)
Next, the effect of the display device according to the embodiment of the present invention will be described using an example of a display device to which the present invention is not applied.

  FIG. 9 is a plan view showing a main part of the display device 5 in which red (R), green (G), and blue (B) are the three primary colors. The display device 5 is a display device to which the present invention is not applied, and is a stripe type display device. Three pixels of red (R), green (G), and blue (B) are used as a set of pixels 50. A black matrix (light-shielding portion) 51 is arranged around the three pixels R, G, and B.

  FIG. 10 is a diagram illustrating the emission spectrum characteristics of the three pixels R, G, and B of the display device 5. In FIG. 10, the horizontal axis represents wavelength and the vertical axis represents relative luminance with the maximum value being 100. FIG. 11 is a chromaticity diagram showing chromaticity characteristics that can be displayed by the display device 5 (for example, LCD). The inner side of the triangle in FIG. 11 shows the color that can be displayed on the display device 5, that is, the chromaticity characteristics of the three primary colors of the pixels R, G, and B. Moreover, the curve which exists inside the triangle of FIG. 11 has shown the black body locus | trajectory.

  In the display device 5, as shown in FIG. 9, the opening areas of the pixels R, G, and B are made equal. The “white” color displayed by the display device 5 is a point 110 above the black body locus in the chromaticity characteristics of FIG. In general, since the desired white color is often set on a black body locus, it can be said that the white color of the display device 5 is whiter than the desired white color. In the chromaticity diagram, the color goes green as it goes up.

  FIG. 12 is a plan view showing a main part of the display device 6 in which red (R), green (G), and blue (B) are the three primary colors. The display device 5 is a display device to which the present invention is not applied, and is a stripe type display device. However, the display device 6 is different from the display device 5 in that the opening areas of the pixels R, G, and B of the three primary colors are not uniform.

  Specifically, the display device 6 uses three pixels R, G, and B as a set of pixels 60, but the opening area of the pixel G is smaller than the opening area of the pixels R and B. A black matrix 61 is arranged around the three pixels R, G, and B.

  FIG. 13 is a diagram showing the emission spectrum characteristics of each of the three pixels R, G, and B of the display device 6. The horizontal axis indicates the relative luminance with the wavelength, and the vertical axis indicates the maximum value of 100. FIG. 14 is a chromaticity diagram showing chromaticity characteristics that can be displayed by the display device 6 (for example, LCD). The inside of the triangle in FIG. 14 shows the color that can be displayed on the display device 6, that is, the chromaticity characteristics by the three primary colors of the pixels R, G, and B. Moreover, the curve which exists inside the triangle of FIG. 14 has shown the black body locus | trajectory.

  Since the pixel G of the display device 6 has a smaller opening area than the pixels of other colors, the green (G) peak in FIG. 13 is lower than the green (G) peak in FIG. As a result, as shown in FIG. 14, the white color displayed by the display device 6 is green and becomes a point 140 plotted on the black body locus. In this way, the display device 6 can display desired white by making the aperture areas of the three primary color pixels R, G, and B non-uniform.

Next, a problem when the technology of the display device 6 (technology of making the aperture areas of the pixels R, G, and B non-uniform) is simply applied to the four primary color display device will be described. This problem appears in the pixel arrangement.
FIG. 15 is a diagram showing a configuration in which the arrangement of pixels is changed in the display device 6 shown in FIG. 12 which is a three primary color display device. FIG. 15A is a plan view of the display device 6, and FIG. 15B is a plan view of the display device 7 obtained by changing the pixel arrangement of the display device 6.

  In the display device 6, a set of pixels 60 are arranged in the order of B, G, and R from the left. On the other hand, in the display device 7, a set of pixels 70 are arranged in the order of B, R, and G from the left. That is, the display device 7 is obtained by switching the positions of the pixel G and the pixel R in the display device 6. In both the display devices 6 and 7, the opening area of the pixel G is smaller than that of the other color pixels. in this way. Since the opening area of the pixel G is small, the widths of the black matrices 61 and 71 near the pixel G are widened, and the black vertical band is recognized thick near the pixel G.

  Here, in the display device 6 and the display device 7, attention is paid to the vertical bands (that is, thick black streaks) 61a, 61b, 71a, 71b of the pixel G. Then, although the arrangement of the pixels G and R is changed between the display device 6 and the display device 7, the vertical bands 61a, 61b, 71a, and 71b of the pixel G appear every two pixels. The vertical band intervals are equal on the device. In general, this also applies to the pixel arrangement of the three primary color display devices other than the display devices 6 and 7. That is, in the three-primary-color display device, no matter what order the pixels are arranged and the aperture area is non-uniform, there is no change in the pattern formed by the pixels and the black matrix (thick vertical band interval). This is due to the periodicity and left-right symmetry of the pixel arrangement in the three primary color stripe display device.

  FIG. 16 is a plan view showing the four primary color display device. The display device 8 shown in FIG. 16A and the display device 9 shown in FIG. 16B have different pixel arrangements. That is, FIG. 16 shows that the pattern (the interval between thick vertical bands) created by the pixels and the black matrix is changed by making the aperture areas of the pixels of the four primary colors non-uniform and changing the arrangement of the pixels. This indicates that the image quality may deteriorate.

Specifically, in the display device 8, four pixels forming a set of pixels 80 are arranged in the order of B, G, R, and C from the left, and in the display device 9, four pixels forming a set of pixels 90 are arranged. Arranged in the order of B, G, C, R from the left. Therefore, the display device 9 has a configuration in which the positions of the pixel R and the pixel C of the display device 8 are interchanged. In both the display devices 8 and 9, the opening areas of the pixels G and R are smaller than those of other colors. That is, in the vicinity of the pixel G and the vicinity of the pixel R,
The widths of the black matrices 81 and 91 are increased, and the black vertical bands 81a, 81b, 81c, 81d, 91a, 91b, 91c, and 91d are thickened.

  Here, attention is paid to the appearance intervals of the black vertical bands 81a, 81b, 81c, 81d, 91a, 91b, 91c, and 91d between the display device 8 and the display device 9. Then, in the display device 8 as viewed from the left, two black vertical bands 81a and 81b appear in succession, and then black vertical bands 81c and 81d appear again after two pixels C and B. On the other hand, in the display device 9, as viewed from the left side, black vertical bands 91a, 91b, 91c, 91d appear every other pixel. That is, the display device 8 and the display device 9 are different in the pattern formed by the pixels and the black matrix (thick vertical band interval). This is because there is an independent arrangement (an arrangement peculiar to the apparatus) in the pixel arrangement in the four primary color stripe type display apparatus. The pixel arrangement B, G, R, and C in the display device 8 and the pixel arrangement B, G, C, and R in the display device 9 are independent arrangements even in consideration of periodicity and left-right symmetry.

  As in the display devices 8 and 9, if the pattern formed by the pixels and the black matrix (interval between the black vertical bands) is different, the image quality is affected. For example, when the black vertical belts 91a and 91b approach as in the display device 8, there is a higher possibility of being perceived as having black streaks in the vertical direction compared to the case where the black vertical bands 91a and 91b do not approach as in the display device 9. . Therefore, in order to realize a display device with higher image quality, it is necessary to sufficiently consider the pattern formed by the pixels and the black matrix.

  On the other hand, in the display devices 1, 2, 3, and 4 according to the embodiments of the present invention shown in FIGS. 1, 4, 7, and 8, the pattern formed by the pixels and the black matrix is sufficiently considered. Since two small aperture areas or two low luminance pixels in the primary color pixel are arranged apart from each other, it is possible to realize a high-quality display device that reduces the recognition of vertical black streaks. it can.

(Electronics)
Next, an electronic apparatus having the display device of the above embodiment as a component will be described.
FIG. 17A is a perspective view showing an example of a mobile phone. In FIG. 17A, reference numeral 600 denotes a mobile phone body, and reference numeral 601 denotes a display unit including the display device of the above embodiment. FIG. 17B is a perspective view showing an example of a portable information processing apparatus such as a word processor or a personal computer. In FIG. 17B, reference numeral 700 denotes an information processing apparatus, reference numeral 701 denotes an input unit such as a keyboard, reference numeral 702 denotes a display unit including the display apparatus of the above embodiment, and reference numeral 703 denotes an information processing apparatus main body. FIG. 17C is a perspective view illustrating an example of a wristwatch type electronic device. In FIG. 17C, reference numeral 800 denotes a watch body, and reference numeral 801 denotes a display unit including the display device of the above embodiment.

  Since the electronic device illustrated in FIG. 17 includes the display device of the above embodiment, a high-quality color image can be displayed.

  The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention, and the specific materials and layers mentioned in the embodiment can be added. The configuration is merely an example, and can be changed as appropriate.

  A display device and a pixel arrangement method according to the present invention include a color filter in a liquid crystal display device (LCD), a color filter or a coloring layer in an organic EL display device, a phosphor in a plasma display device (PDP), and a cathode ray tube display device (CRT). It can be applied to phosphors and the like. In addition, the display device and the pixel arrangement method according to the present invention can be applied to all display devices that form a color with four color dots (pixels).

  In the present invention, the method of setting the area of each of the four pixels so as to display a desired white color is replaced with a method of directly changing the transmission characteristics of the color filter or the light emission characteristics of the backlight for each pixel. May be.

  Also, the pixel arrangement method according to the embodiment of the present invention shown in FIG. 2 or FIG. 5 can be realized by a program and a computer that executes the program. That is, by defining the procedure shown in FIG. 2 or FIG. 5 with a program, recording the program on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium, The pixel arrangement method according to the present invention may be performed. Here, the “computer system” may include an OS and hardware such as peripheral devices.

  Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system.

Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

It is a top view which shows the principal part of the display apparatus which concerns on 1st Embodiment of this invention. It is a flowchart which shows the pixel arrangement | positioning method which concerns on 1st Embodiment of this invention. It is a figure which shows the selection method of two pixels with a small area by the pixel arrangement method same as the above. It is a top view which shows the principal part of the display apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the pixel arrangement | positioning method which concerns on 2nd Embodiment of this invention. It is a figure which shows the selection method of two pixels with small brightness | luminance by the pixel arrangement method same as the above. It is a top view which shows the principal part of the display apparatus which concerns on the application example of this invention. It is a top view which shows the principal part of the display apparatus which concerns on the other application example of this invention. It is a top view which shows the example of the display apparatus using three primary colors. It is a figure which shows the emission spectrum characteristic of a display apparatus same as the above. It is a chromaticity diagram which shows the chromaticity characteristic of a display apparatus same as the above. It is a top view which shows the other example of the display apparatus using three primary colors. It is a figure which shows the emission spectrum characteristic of a display apparatus same as the above. It is a chromaticity diagram which shows the chromaticity characteristic of a display apparatus same as the above. It is a figure which shows the structure which changed arrangement | positioning of a pixel about 3 primary color display apparatus. It is a figure which shows the structure which changed arrangement | positioning of a pixel about 4 primary color display apparatus. It is a perspective view which shows the electronic device which concerns on embodiment of this invention.

Explanation of symbols

1, 2, 3, 4, 5, 6, 7, 8, 9 ... display device 10, 20, 30, 40, 50, 60, 70, 80, 90 ... a set of pixels, 11, 21, 31, 41, 51, 61, 71, 81, 91 ... black matrix, 11a, 11b ... thick black belt, A1, A2, A3, A4 ... aperture area, Aa, Ab ... small pixels, B, G, C, R ... Pixels, Ya, Yb ... Pixels with low brightness

Claims (9)

A display device that performs color display by arranging four pixels corresponding to different colors as a set and arranging a plurality of the sets of pixels,
The pair of pixels includes pixels having different areas, and the two light shielding portions having a larger thickness among the light shielding portions between the pixels of the four pixels are arranged so as not to be adjacent to each other. Display device. The two pixels having a smaller area among the four pixels are arranged not to be adjacent to each other,
2. The display device according to claim 1 , wherein one of the two light-shielding portions having the larger thickness is disposed adjacent to each of the two pixels having the smaller area. .   3. The display device according to claim 1, wherein two pixels having low luminance among the four pixels are arranged so as not to be adjacent to each other.   4. The display device according to claim 1, wherein a plurality of the set of pixels are regularly arranged in a stripe arrangement.   4. The display device according to claim 1, wherein a plurality of the set of pixels are regularly arranged in a mosaic arrangement.   6. The display device according to claim 1, wherein the display device is any one of a liquid crystal display device, an organic EL display device, a plasma display device, and a cathode ray tube display device. A pixel arrangement method for determining an arrangement of four pixels included in a set of pixels and corresponding to different colors,
The area of each of the four pixels is changed, and the area of each of the four pixels that becomes a desired white color when the light of the changed four pixels is combined is obtained. Select one pixel,
Determining an arrangement of the four pixels so that the two selected pixels are not adjacent to each other;
Each of the two pixels having a small area has a pixel arrangement in which one of the two light-shielding portions having a larger thickness among the light-shielding portions between the four pixels is adjacently disposed. Method. The area of each of the four pixels is changed, and the luminance of each of the four pixels that becomes a desired white color when the light of the changed four pixels is combined is obtained. Select one pixel,
The pixel arrangement method according to claim 7, wherein the arrangement of the four pixels is determined so that the selected two pixels are not adjacent to each other. A pixel arrangement program for determining the arrangement of four pixels included in a set of pixels and corresponding to different colors,
The area of each of the four pixels is changed, and the area of each of the four pixels that becomes a desired white color when the light of the changed four pixels is combined is obtained. Processing to select one pixel,
Causing the computer to execute a process of determining the arrangement of the four pixels so that the two selected pixels are not adjacent to each other;
One of the two light-shielding portions having a larger thickness among the light-shielding portions between the four pixels is disposed adjacent to each of the two pixels having a small area. .

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