Image display device
There is provided an image display device, in which a pixel includes sub-pixels of four or more colors that include a color in addition to the three primary colors, and which can display a high-quality image in which false colors or artifacts are suppressed. The image display device includes a pixel area in which a plurality of pixels P are arranged in a matrix shape, and each of the pixels P includes m (m is an integer which is equal to or greater than 4) sub-pixels SP. When it is assumed that the colors of the m sub-pixels SP included in one pixel are C1, C2, . . . , and Cm, the m sub-pixels SP which are sequentially arrayed from an arbitrary position include all of the colors of C1, C2, . . . , and Cm in both the vertical direction and the horizontal direction in the pixel area.
1. An image display device comprising:
a pixel area in which a plurality of pixels are arranged in a matrix shape, each of the pixels including m (m is an integer which is equal to or greater than 4) sub-pixels; and
an image processing unit to which an image having a resolution higher than the number of pixels in the pixel area is input, and which assigns grayscale data of the input image to corresponding sub-pixels, wherein
when it is assumed that colors of m sub-pixels which are included in one pixel are represented as C1, C2, . . . , and Cm, the m sub-pixels which are sequentially arranged from an arbitrary position include all of the colors of C1, C2, . . . , and Cm in both a vertical direction and a horizontal direction in the pixel area; and
the C1, C2, . . . , and Cm include a color included in a first group and a color included in a second group having a higher brightness than the color included in the first group, and the sub-pixels with the color included in the second group are arranged at equal intervals in the pixel area.
2. The image display device according to claim 1 ,
wherein the C1, C2, . . . , and Cm include a color included in a first group and a color included in a second group having a higher brightness than the color included in the first group, and the sub-pixels with the color included in the second group are arranged such that three or more sub-pixels are not sequentially arranged in a diagonal direction in the pixel area.
3. The image display device according to claim 1 , wherein the image processing unit:
determines whether or not the input image includes a high frequency signal in a specific direction; and
assigns the grayscale data of the input image to sub-pixels in order to maintain a resolution in the direction in which the input image is determined to include the high frequency signal.
4. The image display device according to claim 3 , wherein the image processing unit includes a plurality of high-pass filters, and wherein, when assigning the greyscale data, the image processing unit:
calculates weight coefficients for the respective plurality of high-pass filters, based on outputs of the plurality of high-pass filters;
integrates the weight coefficients with the outputs from the respective plurality of high-pass filters; and
synthesizes results of integration.
5. The image display device according to claim 4 ,
wherein the image processing unit further includes a plurality of low-pass filters which are paired with the respective plurality of high-pass filters, and
wherein, when integrating the weight coefficients, the image processing unit integrates the weight coefficients with outputs from the respective plurality of high-pass filters and outputs from the respective plurality of low-pass filters.
6. The image display device according to claim 1 ,
wherein m is 4.
7. The image display device according to claim 1 ,
wherein m is 6.
8. The image display device according to claim 1 ,
wherein the colors of C1, C2, . . . , and Cm include three primary colors, that is, red, green, and blue.
9. The image display device according to claim 8 ,
wherein the colors of C1, C2, . . . , and Cm further include at least one color of cyan, magenta, yellow, and white.
10. The image display device according to claim 1 , comprising:
a liquid crystal panel in which the pixel area is formed.
11. An image display device comprising:
a pixel area in which a plurality of pixels are arranged in a matrix shape, each of the pixels including m (m is an integer which is equal to or greater than 4) sub-pixels; and
an image processing unit to which an image having a resolution higher than the number of pixels in the pixel area is input, and which assigns grayscale data of the input image to corresponding sub-pixels,
wherein, when it is assumed that colors of m sub-pixels which are included in one pixel are represented as C1, C2, . . . , and Cm, the m sub-pixels which are sequentially arranged from an arbitrary position include all of the colors of C1, C2, . . . , and Cm in both a vertical direction and a horizontal direction in the pixel area,
wherein the image processing unit:
determines whether or not the input image includes a high frequency signal in a specific direction; and
assigns the grayscale data of the input image to subpixels in order to maintain a resolution in the direction in which the input image is determined to include the high frequency signal,
wherein the image processing unit includes a plurality of high-pass filters, and
wherein, when assigning the greyscale data, the image processing unit:
calculates weight coefficients for the respective plurality of high-pass filters, based on outputs of the plurality of high-pass filters;
integrates the weight coefficients with the outputs from the respective plurality of high-pass filters; and
synthesizes results of integration.
12. The image display device according to claim 11 ,
wherein the C1, C2, . . . , and Cm include a color included in a first group and a color included in a second group having a higher brightness than the color included in the first group, and the sub-pixels with the color included in the second group are arranged at equal intervals in the pixel area.
13. The image display device according to claim 11 ,
wherein the C1, C2, . . . , and Cm include a color included in a first group and a color included in a second group having a higher brightness than the color included in the first group, and the sub-pixels with the color included in the second group are arranged such that three or more sub-pixels are not sequentially arranged in a diagonal direction in the pixel area.
14. The image display device according to claim 11 ,
wherein the image processing unit further includes a plurality of low-pass filters which are paired with the respective plurality of high-pass filters, and
wherein, when integrating the weight coefficients, the image processing unit integrates the weight coefficients with outputs from the respective plurality of high-pass filters and outputs from the respective plurality of low-pass filters.
15. The image display device according to claim 11 ,
wherein m is 4.
16. The image display device according to claim 11 ,
wherein m is 6.
17. The image display device according to claim 11 ,
wherein the colors of C1, C2, . . . , and Cm include three primary colors, that is, red, green, and blue.
18. The image display device according to claim 17 ,
wherein the colors of C1, C2, . . . , and Cm further include at least one color of cyan, magenta, yellow, and white.
19. The image display device according to claim 11 ,
further comprising: a liquid crystal panel in which the pixel area is formed.