Abstract:
An image device includes a plurality of first sub-pixels, a plurality of second sub-pixels, a plurality of third sub-pixels, a plurality of fourth sub-pixels, and a plurality of fifth sub-pixels. The image device further is consisted by a plurality of basic repeating units in a 2×8 matrix. Each of the basic repeating units comprises the first sub-pixels, the second sub-pixels, the third sub-pixels, the fourth sub-pixels, and the fifth sub-pixel. A ratio of the first sub-pixels to the second sub-pixels to the third sub-pixels to the fourth sub-pixels and to the fifth sub-pixel in the basic repeating unit is 4:4:4:3:1.

Description:
FIELD 
       [0001]    The subject matter herein generally relates to display technology, pertains particularly to image device with improved chrominance quality of an image device or a display by the utilization of RGBW pixels and RGBY pixels. 
       TECHNICAL FIELD 
       [0002]    Referring to  FIG. 1 , it shows a conventional RGBW display. The conventional RGBW display  10  includes a plurality of RGBW pixels  11 . Each RGBW pixel  11  includes a green sub-pixel  111 , a red sub-pixel  112 , a blue sub-pixel  113  and a white sub-pixel  114  arranged in a 2×2 matrix. The conventional RGBW display  10  has the merit of enhanced color space and improved brightness and contrast, compared with traditional RGB display. U.S. Pat. No. 4,892,391, U.S. Pat. No. 5,757,452, U.S. Pat. Nos. 7,286,136, 7,742,205, and U.S. Pat. No. 7,583,279 teach RGBW displays. However, the conventional RGBW display  10  has the deficiency of dark yellow. U.S. Pat. No. 4,800,375, U.S. Pat. No. 7,864,271, and U.S. Pat. No. 8,749,727 teach RGBY displays which claim to have better yellow color. However, RGBY display lacks the merits of RGBW displays. U.S. Pat. No. 7,248,314, U.S. Pat. No. 7,995,019, U.S. Pat. No. 8,248,440, U.S. Pat. No. 8,441,601 and U.S. Pat. No. 8,558,857 teach displays with five color sub-pixels. However five color displays have the deficiency of high cost and low brightness and contrast. U.S. Pat. No. 8,384,653 teaches a method to relief the dark yellow problem by classifying the image signal and then adjusts the backlight luminance according to the classification. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0003]    Implementations of the present technology will now be described, by way of example only, with reference to the attached figures. 
           [0004]      FIG. 1  illustrates a conventional RGBW display. 
           [0005]      FIG. 2  illustrates an image device according to a first embodiment of the present disclosure. 
           [0006]      FIG. 3  illustrates an example of the image device of  FIG. 2  according to the first embodiment of the present disclosure. 
           [0007]      FIGS. 4-9  illustrate image devices according to an embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0008]    It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features. The description is not to be considered as limiting the scope of the embodiments described herein. 
         [0009]    The term “coupled” is defined as connected, whether directly or indirectly through intervening components, and is not necessarily limited to physical connections. The connection can be such that the objects are permanently connected or releasably connected. The term “substantially” is defined to be essentially conforming to the particular dimension, shape or other word that substantially modifies, such that the component need not be exact. For example, substantially cylindrical means that the object resembles a cylinder, but can have one or more deviations from a true cylinder. The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series and the like. 
         [0010]    For consistency purpose and ease of understanding, like features are identified (although, in some instances, not shown) with like numerals in the exemplary figures. However, the features in different embodiments may differ in other respects, and thus shall not be narrowly confined to what is shown in the figures. 
         [0011]      FIG. 2  illustrates a schematic planar of an image device  20  in accordance with some embodiments of the instant disclosure. The image device  20  includes a plurality of pixels including a plurality of sub-pixels with different colors arranged in a matrix of rows and columns. As shown in  FIG. 2 , the image device  20  includes a plurality of white sub-pixels  204  and a plurality of yellow sub-pixels  205 . Every odd row includes white sub-pixels  204  and yellow sub-pixels  205 . Every even row includes the white sub-pixels  204  without the yellow sub-pixel  205 . Namely, in any two adjacent rows, one of the two adjacent rows contains the white sub-pixels  204  and the yellow sub-pixels  205 , and the other of the two adjacent rows merely contains the white sub-pixels  204 . The white sub-pixels  204  and the yellow sub-pixels  205  in the same row are staggered disposed, and the white sub-pixels  204  and the yellow sub-pixels  205  in the same column are staggered disposed. In each row containing the white sub-pixels  204  and the yellow sub-pixels  205 , each of the yellow sub-pixels  205  is arranged between two adjacent white sub-pixels  204 , and each yellow sub-pixel  205  and the adjacent white sub-pixel  204  are separated by three sub-pixels different from the white sub-pixel  204  and the yellow sub-pixel  205 . In each row containing the white sub-pixels  204  and excluding the yellow sub-pixels  205 , two adjacent white sub-pixels  204  are separated by three sub-pixels different from the white sub-pixel  204  and the yellow sub-pixel  205 . Every even column includes at least one white sub-pixels  204 . Namely, in any two adjacent even columns, one of the two adjacent even columns includes the white sub-pixels  204 , and the adjacent even column includes white sub-pixels  204  and the yellow sub-pixels  205 . In each column containing the white sub-pixels  204  and the yellow sub-pixels  205 , each white sub-pixel  204  and the adjacent yellow sub-pixel  205  are separated by one sub-pixel different from the white sub-pixel  204  and the yellow sub-pixel  205 . In each column containing the white sub-pixels  204  and excluding the yellow sub-pixel  205 , two adjacent white sub-pixels  204  are separated by one sub-pixel different from the white sub-pixel  204  and the yellow sub-pixel  205 .  FIG. 2  shows an arrangement rule of the sub-pixels. 
         [0012]      FIG. 3  illustrates an example of the image device  20  of  FIG. 2  according the embodiment of the present disclosure. The image device  20  includes a plurality of pixels including a plurality of sub-pixels with different colors arranged in a matrix of rows and columns. As shown in  FIG. 3 , the image device  20  includes a plurality of A sub-pixels  201 , a plurality of B sub-pixels  202 , a plurality of C sub-pixels  203 , a plurality of white sub-pixels  204  and a plurality of yellow sub-pixels  205 . In any 2×2 matrix  21 , there are always one A sub-pixel  201 , one B sub-pixel  202 , and one C sub-pixel  203 . In other words, the image device  20  may include a plurality of ABCW pixels and a plurality of ABCY pixels. Each ABCW pixel includes one A sub-pixel  201 , one B sub-pixel  202 , one C sub-pixel  203  and one white sub-pixel  204 . Each ABCY pixel includes one A sub-pixel  201 , one B sub-pixel  202 , one C sub-pixel  203  and one yellow sub-pixel  205 . The ABCW pixels and the ABCY pixels are mixed in the image device  20 . The A sub-pixel  201 , the B sub-pixel  202 , and the C sub-pixel  203  may respectively be a red sub-pixel, a green sub-pixel, or a blue sub-pixel, as required or designed. Namely, the A sub-pixel  201  may be a red sub-pixel, a green sub-pixel, or a blue sub-pixel, the B sub-pixel  202  may be a red sub-pixel, a green sub-pixel, or a blue sub-pixel, and the C sub-pixel  203  may be a red sub-pixel, a green sub-pixel, or a blue sub-pixel. 
         [0013]      FIGS. 4-9  illustrate several modified examples of image devices  40 A- 40 F following the arrangement rule of the white sub-pixels and yellow sub-pixel described above shown in  FIG. 2  according to an embodiment of the present disclosure. Each of the image devices  40 A- 40 F includes a plurality of pixels including a plurality of sub-pixels with different colors arranged in a matrix of rows and columns. More specifically, each of the image devices  40 A- 40 F includes a plurality of RGBW pixels  42  and a plurality of RGBY pixels  44 . Each RGBW pixels  42  includes one red sub-pixel  401 , one green sub-pixel  402 , one blue sub-pixel  403  and one white sub-pixel  404 . Each RGBY pixel includes one red sub-pixel  401 , one green sub-pixel  402 , one blue sub-pixel  403  and one yellow sub-pixel  405 . The RGBW pixels  42  and the RGBY pixels  44  are mixed in each of the image devices  40 A- 40 F. 
         [0014]    As shown in  FIGS. 4-9 , each of the image devices  40 A- 40 F includes a plurality of white sub-pixels  404  and a plurality of yellow sub-pixels  405 . Every odd row includes white sub-pixels  404  and yellow sub-pixels  405 . Every odd row includes white sub-pixels  404  and yellow sub-pixels  405 . Every even row includes the white sub-pixels  404  and excludes the yellow sub-pixel  405 . Namely, in any two adjacent rows, one of the two adjacent rows contains the white sub-pixels  404  and the yellow sub-pixels  405 , and the other of the two adjacent rows contains the white sub-pixels  404  and excludes the yellow sub-pixel  205 . The white sub-pixels  404  and the yellow sub-pixels  405  in the same row are staggered disposed, and the white sub-pixels  404  and the yellow sub-pixels  405  in the same column are staggered disposed. In each row containing the white sub-pixels  404  and the yellow sub-pixels  405 , each of the yellow sub-pixels  405  is arranged between two adjacent white sub-pixels  404 , and each yellow sub-pixel  405  and the adjacent white sub-pixel  404  are separated by three sub-pixels different from the white sub-pixel  404  and the yellow sub-pixel  405 . In each row containing the white sub-pixels  404  and excluding the yellow sub-pixels  405 , two adjacent white sub-pixels  404  are separated by three sub-pixels different from the white sub-pixel  404  and the yellow sub-pixel  405 . Every even column includes at least one white sub-pixels  404 . Namely, in any two adjacent even columns, one of the two adjacent even columns includes the white sub-pixels  404 , and the adjacent even column includes white sub-pixels  404  and the yellow sub-pixels  405 . In each column containing the white sub-pixels  404  and the yellow sub-pixels  405 , each white sub-pixel  404  and the adjacent yellow sub-pixel  405  are separated by one sub-pixel different from the white sub-pixel  404  and the yellow sub-pixel  405 . In each column containing the white sub-pixels  404  and excluding the yellow sub-pixel  405 , two adjacent white sub-pixels  404  are separated by one sub-pixel different from the white sub-pixel  404  and the yellow sub-pixel  405 . 
         [0015]    As shown in  FIGS. 4-9 , a basic repeating unit  46  is defined. The basic repeating unit  46  is a 2×8 matrix with different color sub-pixels. Repeating the basic repeating unit  46  as much as required to form each of the image devices  40 A- 40 F. In the basic repeating unit  46 , a ratio of the number of the red sub-pixels  401  to the number of the green sub-pixels  402  to the number of the blue sub-pixels  403  to the number of the white sub-pixels  404  and to the number of the yellow sub-pixels  405  is about 4:4:4:4:3:1. Furthermore, in the basic repeating unit  46 , a ratio of the total area of red sub-pixels  401  to the total area of green sub-pixels  402  to the total area of blue sub-pixels  403  to the total area of white sub-pixels  404  and to the total area of yellow sub-pixels  405  is about 4:4:4:3:1. 
         [0016]    As shown in  FIGS. 4-9 , a 3×4 matrix  48  is defined. In the 3×4 matrix  48 , a ratio of the number of the red sub-pixels  401  to the number of the green sub-pixels  402  to the number of the blue sub-pixels  403  to the number of the white sub-pixels  404  and to the number of the yellow sub-pixels  405  is about 3:3:3:2:1. Furthermore, in the 3×4 matrix  48 , a ratio of the total area of red sub-pixels  401  to the total area of green sub-pixels  402  to the total area of blue sub-pixels  403  to the total area of white sub-pixels  404  and to the total area of yellow sub-pixels  405  is about 3:3:3:2:1. 
         [0017]    More specifically, when chooses any 3×4 matrix in each of the image devices  40 A- 40 F, a ratio of the number of the red sub-pixels  401  to the number of the green sub-pixels  402  to the number of the blue sub-pixels  403  to the number of the white sub-pixels  404  and to the number of the yellow sub-pixels  405  is about 3:3:3:2:1. When chooses any 3×4 matrix in each of the image devices  40 A- 40 F, a ratio of the total area of the red sub-pixels  401  to the total area of the green sub-pixels  402  to the total area of the blue sub-pixels  403  to the total area of the white sub-pixels  404  and to the total area of the yellow sub-pixels  405  is about 3:3:3:2:1. 
         [0018]    Further, a designated white balance status can be maintained by adjusting the blue information of the image device. In case of liquid-crystal display LCD, for example the backlight color can be adjusted, and/or the thickness, area, and/or pigment of the blue sub-pixels in the color filter can be adjusted, and/or the utilization of quantum dots can be adjusted so as to adjust the blue information and to maintain a designated white balance status of the image device. In case of organic light-emitting diode OLED plus color filter, OLED color can be adjusted to bluish, and/or the thickness, area, and/or pigment of the blue sub-pixels in the color filter can be adjusted, and/or the utilization of quantum dots can be adjusted so as to adjust the blue information and to maintain a designated white balance status of the image device. 
         [0019]    The present disclosure also provides a method to determine the ratio of the number of RGBW pixels to the number of RGBY pixels in an image device according to the invention. The method of the present disclosure includes a step for determining the ratio by a function of a yellow sub-pixel information, a red sub-pixel information, a green sub-pixel information, a blue sub-pixel information and a white sub-pixel information of the image device. The sub-pixel information includes the chrominance data and luminance data of the said sub-pixel. In an embodiment, the yellow sub-pixel information includes the chrominance data and luminance data of the yellow sub-pixel, the red sub-pixel information includes the chrominance data and luminance data of the red sub-pixel, the green sub-pixel information includes the chrominance data and luminance data of the green sub-pixel, and the white sub-pixel information includes the chrominance data and luminance data of the white sub-pixel. 
         [0020]    By the addition of RGBY pixels, the problem of dark yellow in the conventional RGBW display can be solved and chrominance quality can be improved. The present invention thus can solve the dark yellow problem of conventional RGBW display. The bluish problem can also be solved by the addition of RGBY pixels. 
         [0021]    The foregoing outlines features of several embodiments so that those skilled in the art may better understand the aspects of the present disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions, and alterations herein without departing from the spirit and scope of the present disclosure.