Abstract:
A display panel includes a plurality of pixels. Each of the pixels includes four sub-pixels. After the display panel receives luminance values of four sub-pixels of a pixel, the display panel compares a sub-pixel of the pixel with same color sub-pixels of neighboring pixels. If a luminance value of the same color sub-pixel of neighboring pixel is greater than the luminance value of the sub-pixel by a predetermined threshold, the luminance value of the sub-pixel of the pixel is reduced.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The disclosure is related to a method of displaying image, and more particularly, to a method of displaying image to a display panel and adjusting luminance intensity of a plurality of sub-pixels to reduce bright lines in the display panel. 
         [0003]    2. Description of the Prior Art 
         [0004]    Liquid Crystal Display (LCD) and light emitting diode (LED) display are portable, power efficient and have no radiation, therefore, it is a preferred display to be used in portable devices such as Multimedia players, mobile phones, personal digital assistants (PDA), computer monitors or flat-screen TVs and other electronic products. While an organic light emitting diode (OLED) display has the advantage of natural light emission, wide viewing angle, high contrast, low operating voltage, short response time, dynamic color, and simple manufacturing process with small and thin circuitry. It can be seen that OLED displays will be able to replace LCDs. OLED is a light-emitting diode in which the emissive electroluminescent layer is a film of organic compound which emits light in response to an electric current. At the boundary between the emissive and the conductive layers, electrons find electron holes. When an electron finds an electron hole, the electron fills the hole. The electron then gives up energy in the form of a photon of light. 
         [0005]    To improve the luminous efficiency, a white element is proposed to create a four color display panel. Unlike the three color (red, green and blue) display panel, each pixel of the four color display includes a red, a green, a blue and a white sub-pixel. When a color image is displayed beside a white image, there is a large visual contrast between the color image and the white image. The large visual contrast will cause the formation of bright lines that reduces the display quality. 
       SUMMARY 
       [0006]    An embodiment of a method of displaying image of a display panel is disclosed. The display panel has a plurality of pixels with each pixel having a first sub-pixel, a second sub-pixel, and a fourth sub-pixel. The method comprises receiving luminance values of a first sub-pixel, a second sub-pixel, and a fourth sub-pixel of a pixel four and if a luminance value of a first sub-pixel of a pixel two is at least a second predetermined threshold value substantially more than the luminance value of the first sub-pixel of the pixel four having the pixel two be a pixel on a column next to and a row above the pixel four, a luminance value of a first sub-pixel of a pixel five is at least the second predetermined threshold value substantially more than the luminance value of the first sub-pixel of the pixel four having the pixel five be a pixel on the column next to and a same row as the pixel four, a luminance value of a first sub-pixel of a pixel eight is at least the second predetermined threshold value substantially more than the luminance value of the first sub-pixel of the pixel four having the pixel eight be a pixel on the column next to and a row below the pixel four, a luminance value of a second sub-pixel of a pixel one is at least a third predetermined threshold value substantially more than the luminance value of a second sub-pixel of the pixel four having the pixel one be a pixel on a same column as and the row above the pixel four, and/or a luminance value of a second sub-pixel of a pixel seven is at least the third predetermined threshold value substantially more than the luminance value of the second sub-pixel of the pixel four having the pixel seven be a pixel on the same column as and the row below the pixel four, controlling the fourth sub-pixel of the pixel four to display an image with a luminance value substantially less than the luminance value of the fourth sub-pixel of the pixel four. 
         [0007]    Another embodiment of the method of displaying image of the display panel is disclosed. The display panel has a plurality of pixels with each pixel having a first sub-pixel, a second sub-pixel, and a fourth sub-pixel. The method comprises receiving luminance values of a first sub-pixel, a second sub-pixel, and a fourth sub-pixel of a pixel four and if a luminance value of a fourth sub-pixel of a pixel zero having the pixel zero be a pixel on a column before and a row above the pixel four, a fourth sub-pixel of a pixel three having the pixel three be a pixel on the column before and a same row as the pixel four, and a fourth sub-pixel of a pixel six having the pixel six be a pixel on the column before and a row below the pixel four are not at least a first predetermined threshold value substantially more than the luminance value of the fourth sub-pixel of the pixel four, but a luminance value of a first sub-pixel of a pixel two is at least a second predetermined threshold value substantially more than the luminance value of the first sub-pixel of the pixel four having the pixel two be a pixel on a column after and the row above the pixel four, a luminance value of a first sub-pixel of a pixel five is at least the second predetermined threshold value substantially more than the luminance value of the first sub-pixel of the pixel four having the pixel five be a pixel on the column after and the same row as the pixel four, a luminance value of a first sub-pixel of a pixel eight is at least the second predetermined threshold value substantially more than the luminance value of the first sub-pixel of the pixel four having the pixel eight be a pixel on the column after and the row below the pixel four, a luminance value of a second sub-pixel of a pixel one is at least a third predetermined threshold value substantially more than the luminance value of the second sub-pixel of the pixel four having the pixel one be a pixel on a same column as and the row above the pixel four, and/or a luminance value of a second sub-pixel of a pixel seven is at least the third predetermined threshold value substantially more than the luminance value of the second sub-pixel of the pixel four having the pixel seven be a pixel on the same column as and the row below the pixel four, controlling the fourth sub-pixel of the pixel four to display an image with a luminance value substantially less than the luminance value of the fourth sub-pixel of the pixel four. 
         [0008]    Another embodiment of the method of displaying image of the display panel is disclosed. The display panel has a plurality of pixels with each pixel having a first sub-pixel, a second sub-pixel, and a fourth sub-pixel. The method comprises receiving luminance values of a first sub-pixel, a second sub-pixel and a fourth sub-pixel of a pixel four and if a luminance value of a fourth sub-pixel of a pixel zero having the pixel zero be a pixel on a column next to and a row above the pixel four, a fourth sub-pixel of a pixel three having the pixel three be a pixel on the column next to and a same row as the pixel four, and/or a fourth sub-pixel of a pixel six having the pixel six be a pixel on the column next to and a row below the pixel four is at least a first predetermined threshold value substantially more than the luminance value of the fourth sub-pixel of the pixel four, controlling the first sub-pixel of the pixel four to display an image with a luminance value substantially less than the luminance value of the first sub-pixel of the pixel four, and controlling the second sub-pixel of the pixel four to display an image with a luminance value substantially less than the luminance value of the second sub-pixel of the pixel four. 
         [0009]    These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]      FIG. 1  illustrates an embodiment of a display panel according to the present invention. 
           [0011]      FIG. 2  illustrates a flowchart of a first embodiment of a method of displaying image of the display panel. 
           [0012]      FIG. 3  illustrates a flowchart of a second embodiment of the method of displaying image of the display panel. 
           [0013]      FIG. 4  illustrates another embodiment of the display panel according to the present invention. 
           [0014]      FIG. 5  illustrates a flowchart of a third embodiment of the method of displaying image of the display panel. 
           [0015]      FIG. 6  illustrates a flowchart of a fourth embodiment of the method of displaying image of the display panel. 
       
    
    
     DETAILED DESCRIPTION 
       [0016]    Please refer to  FIG. 1 .  FIG. 1  illustrates an embodiment of a display panel  100  according to the present invention. The display panel  100  comprises a plurality of pixels P 0  to P 8  (or namely first to ninth pixels). A pixel zero P 0  (or namely first pixel) has a first sub-pixel R 0 , a second sub-pixel G 0 , a third sub-pixel B 0 , and a fourth sub-pixel W 0 . The first sub-pixel R 0  can be a red sub-pixel. The second sub-pixel G 0  can be a green pixel. The third sub-pixel B 0  can be a blue sub-pixel. The fourth sub-pixel W 0  can be a white sub-pixel (or namely transparent sub-pixel). A pixel one P 1  (or namely second pixel) has a first sub-pixel R 1 , a second sub-pixel G 1 , a third sub-pixel B 1 , and a fourth sub-pixel W 1 . And accordingly, a pixel eight P 8  (or namely ninth pixel) has a first sub-pixel R 8 , a second sub-pixel G 8 , a third sub-pixel B 8 , and a fourth sub-pixel W 8 . The plurality of pixels P 0  to P 8  in  FIG. 1  is only part of the plurality of pixels of the display panel  100  and is not intended to limit the number of pixels in the display panel  100 . In subsequent examples of the present invention, a pixel four P 4  (or namely fifth pixel) shall represent a pixel that is being processed. When processing a next pixel, the next pixel would become a pixel four P 4 , and the current pixel four P 4  would then become a respective pixel three P 3  (or namely fourth pixel). 
         [0017]    Please refer to  FIG. 2 .  FIG. 2  illustrates a flowchart of a first embodiment of a method of displaying image of the display panel  100 . As shown in  FIG. 2 , the method of displaying image of the display panel  100  may include and is not limited to the following steps: 
         [0018]    Step  202 : Start; 
         [0019]    Step  204 : Receive luminance values of a first sub-pixel R 4 , a second sub-pixel G 4 , a third sub-pixel B 4  and a fourth sub-pixel W 4  of the pixel four P 4  (or namely fifth pixel); 
         [0020]    Step  206 : Is a luminance value of a first sub-pixel R 2  of a pixel two P 2  (or namely third pixel) at least a second predetermined threshold value TH 2  substantially more than the luminance value of the first sub-pixel R 4  of the pixel four P 4  having the pixel two P 2  be a pixel on a column after and a row above the pixel four P 4 , a luminance value of a first sub-pixel R 5  of a pixel five P 5  (or namely sixth pixel) at least the second predetermined threshold value TH 2  substantially more than the luminance value of the first sub-pixel R 4  of the pixel four P 4  having the pixel five P 5  be a pixel on the column after and a same row as the pixel four P 4 , a luminance value of the first sub-pixel R 8  of the pixel eight P 8  (or namely ninth pixel) at least the second predetermined threshold value TH 2  substantially more than the luminance value of the first sub-pixel R 4  of the pixel four P 4  having the pixel eight P 8  be a pixel on the column after and a row below the pixel four P 4 , a luminance value of the second sub-pixel G 1  of the pixel one P 1  (or namely second pixel) at least a third predetermined threshold value TH 3  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4  having the pixel one P 1  be a pixel on a same column as and the row above the pixel four P 4 , and/or a luminance value of a second sub-pixel G 7  of a pixel seven P 7  (or namely eighth pixel) at least the third predetermined threshold value TH 3  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4  having the pixel seven P 7  be a pixel on the same column and the row below the pixel four P 4 ? If so, go to step  208 ; If not, go to step  210 ; 
         [0021]    Step  208 : Control the fourth sub-pixel W 4  of the pixel four P 4  to display an image with a luminance value substantially less than the luminance value of the fourth sub-pixel W 4  of the pixel four P 4 ; Go to step  214 ; 
         [0022]    Step  210 : Is a luminance value of the fourth sub-pixel W 0  of the pixel zero P 0  (or namely first pixel) having the pixel zero P 0  be a pixel on a column before and the row above the pixel four P 4 , a fourth sub-pixel W 3  of the pixel three P 3  having the pixel three be a pixel on the column before and the same row as the pixel four P 4 , and/or a fourth sub-pixel WE of a pixel six P 6  (or namely seventh pixel) having the pixel six P 6  be a pixel on the column before and the row below the pixel four P 4  at least a first predetermined threshold value TH 1  substantially more than the luminance value of the fourth sub-pixel W 4  of the pixel four P 4 ? If so, go to step  212 ; If not, go to step  214 ; 
         [0023]    Step  212 : Control the first sub-pixel R 4  of the pixel four P 4  to display an image with the luminance value substantially less than the luminance value of the first sub-pixel R 4  of the pixel four P 4 , and control the second sub-pixel G 4  of the pixel four P 4  to display an image with the luminance value substantially less than the luminance value of the second sub-pixel G 4  of the pixel four P 4 ; Go to step  214 ; 
         [0024]    Step  214 : End. 
         [0025]    For the plurality of pixels P 0  to P 8 , a plurality of first sub-pixels R 0  to R 8  are red sub-pixels, a plurality of second sub-pixels G 0  to G 8  are green sub-pixels, a plurality of third sub-pixels B 0  to B 8  are blue sub-pixels, and a plurality of fourth sub-pixels W 0  to W 8  are white sub-pixels. The colors of a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel may be interchanged or may be of other colors. Each of the plurality of pixels P 0  to P 8  as shown in  FIG. 1  comprises of a red sub-pixel, green sub-pixel, a blue sub-pixel and a white sub-pixel and is arranged sequentially from left to right. However, the arrangement of the plurality of sub-pixels in each pixel is not limited to the arrangement presented. 
         [0026]    Step  206  determines if at least one of the luminance values of the first sub-pixels R 2 , R 5  and R 8  has at least the second threshold value TH 2  substantially more than the luminance value of the first sub-pixel R 4  of the pixel four P 4  or if at least one of the luminance values of the second sub-pixels G 1  and G 7  has at least the third threshold value TH 3  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4 . If so, the luminance value of the fourth sub-pixel W 4  of the pixel four P 4  is substantially reduced by 1% to 50% to display lower brightness. 
         [0027]    Step  210  determines if at least one of the luminance values of the fourth sub-pixels W 0 , W 3  and WE has at least the first threshold value TH 1  substantially more than the luminance value of the fourth sub-pixel W 4  of the pixel four P 4 . If so, the luminance values of the first sub-pixel R 4  and the second sub-pixel G 4  of the pixel four P 4  are substantially reduced by 1% to 50% to display lower brightness. 
         [0028]    Since a human eye is most sensitive to color green followed by color red, the present invention reduces the luminance value as a means to compensate for a large difference in the brightness between sub-pixels of the same color of adjacent pixels which may result to appearance of a bright line during display. For example, if the red sub-pixel of at least one of the pixel two P 2  (or namely third pixel), the pixel five P 5  (or namely sixth pixel) and the pixel eight P 8  (or namely ninth pixel) has a luminance value at least the second threshold value TH 2  substantially more than the red sub-pixel of the pixel four P 4  (or namely fifth pixel) and/or at least one of the second sub-pixels G 1  and G 7  has a luminance value at least the third threshold value TH 3  substantially more than the second sub-pixel G 4 , a bright line will appear. The first embodiment can reduce the brightness of the white sub-pixel of the pixel four P 4  (or namely fifth pixel) and lessen color intensity difference between the pixel four P 4  (or namely fifth pixel) and adjacent pixels, such as the pixel one P 1  (or namely second pixel), the pixel two P 2  (or namely third pixel), the pixel five P 5  (or namely sixth pixel), the pixel seven P 7  (or namely eighth pixel) and the pixel eight P 8  (or namely ninth pixel), thereby eliminating the bright line. 
         [0029]    Please refer to  FIG. 3 .  FIG. 3  illustrates a flowchart of a second embodiment of the method of displaying image of the display panel  100 . As shown in  FIG. 3 , the method of displaying image of the display panel  100  may include and is not limited to the following steps: 
         [0030]    Step  302 : Start; 
         [0031]    Step  304 : Receive the luminance values of the first sub-pixel R 4 , the second sub-pixel G 4 , the third sub-pixel B 4  and the fourth sub-pixel W 4  of the pixel four P 4  (or namely fifth pixel); 
         [0032]    Step  306 : Is the luminance value of the fourth sub-pixel W 0  of the pixel zero P 0  (or namely first pixel) having the pixel zero P 0  be the pixel on the column before and the row above the pixel four P 4 , the fourth sub-pixel W 3  of the pixel three P 3  (or namely fourth pixel) having the pixel three be the pixel on the column before and the same row as the pixel four P 4 , and the fourth sub-pixel WE of the pixel six P 6  (or namely seventh pixel) having the pixel six P 6  be the pixel on the column before and the row below the pixel four P 4  at least the first predetermined threshold value TH 1  substantially more than the luminance value of the fourth sub-pixel W 4  of the pixel four P 4 ? If so, go to step  308 ; If not, go to step  310 ; 
         [0033]    Step  308 : Control the first sub-pixel R 4  of the pixel four P 4  to display an image with the luminance value substantially less than the luminance value of the first sub-pixel R 4  of the pixel four P 4 , and control the second sub-pixel G 4  of the pixel four P 4  to display an image with the luminance value substantially less than the luminance value of the second sub-pixel G 4  of the pixel four P 4 ; Go to step  314 ; 
         [0034]    Step  310 : Is the luminance value of the first sub-pixel R 2  of the pixel two P 2  at least the second predetermined threshold value TH 2  substantially more than the luminance value of the first sub-pixel R 4  of the pixel four P 4  having the pixel two P 2  (or namely third pixel) be the pixel on the column after and the row above the pixel four P 4 , the luminance value of the first sub-pixel R 5  of the pixel five P 5  at least the second predetermined threshold value TH 2  substantially more than the luminance value of the first sub-pixel R 4  of the pixel four P 4  having the pixel five P 5  (or namely sixth pixel) be the pixel on the column after and the same row as the pixel four P 4 , the luminance value of the first sub-pixel R 8  of the pixel eight P 8  (or namely ninth pixel) at least the second predetermined threshold value TH 2  substantially more than the luminance value of the first sub-pixel R 4  of the pixel four P 4  having the pixel eight P 8  be the pixel on the column after and the row below the pixel four P 4 , the luminance value of the second sub-pixel G 1  of the pixel one P 1  at least the third predetermined threshold value TH 3  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4  having the pixel one P 1  be the pixel on the same column as and the row above the pixel four P 4 , and/or the luminance value of the second sub-pixel G 7  of the pixel seven P 7  (or namely eighth pixel) at least the third predetermined threshold value TH 3  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4  having the pixel seven P 7  be the pixel on the same column as and the row below the pixel four P 4 ? If so, go to step  312 ; If not, go to step  314 ; 
         [0035]    Step  312 : Control the fourth sub-pixel W 4  of the pixel four P 4  to display an image with the luminance value substantially less than the luminance value of the fourth sub-pixel W 4  of the pixel four P 4 ; Go to step  314 ; 
         [0036]    Step  314 : End. 
         [0037]    As shown in  FIG. 3 , the pixel four P 4  (or namely fifth pixel) is compared to the pixel zero P 0  (or namely first pixel), the pixel three P 3  (or namely fourth pixel) and the pixel six P 6  (or namely seventh pixel) using their corresponding fourth sub-pixels. If the luminance values of the fourth sub-pixels W 0 , W 3  and W 6  are not at least the first threshold value TH 1  substantially more than the luminance value of the fourth pixel W 4  of the pixel four P 4 , then proceed with the pixel four P 4  being compared with the pixel two P 2  (or namely third pixel), the pixel five P 5  (or namely sixth pixel) and the pixel eight P 8  (or namely ninth pixel) using their corresponding first sub-pixels and/or the pixel four P 4  being compared with the pixel one P 1  (or namely second pixel) and the pixel seven P 7  (or namely eighth pixel) using their corresponding second sub-pixels. The effect of the method shown in  FIG. 3  is similar to the effect of the method shown in  FIG. 2 , therefore is no longer described in detail for brevity. In step  308 , the luminance values of the first sub-pixel R 4  and the second sub-pixel G 4  of pixel four P 4  can be substantially reduced by 1% to 50%. In step  312 , the luminance value of the fourth sub-pixel W 4  can be substantially reduced by 1% to 50%. 
         [0038]    Please refer to  FIG. 4 .  FIG. 4  illustrates another embodiment of a display panel  400  according to the present invention. The display panel  400  comprises a plurality of pixels P 0  to P 8  (or namely first to eighth pixels). The difference between the display panel  400  and the display panel  100  is that for the display panel  100 , a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel are arranged sequentially from left to right as shown in  FIG. 1 . Whereas, for the display panel  400 , a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel of the plurality of pixels P 0  to P 8  are arranged in a two by two matrix. The two by two matrix has a first row first column as the red sub-pixel, a first row second column as the white sub-pixel, a second row first column as the green sub-pixel and a second row second column as the blue sub-pixel. 
         [0039]    Please refer to  FIG. 5 .  FIG. 5  illustrates a flowchart of a third embodiment of the method of displaying image of the display panel  400 . As shown in  FIG. 5 , the method of displaying image of the display panel  400  may include and is not limited to the following steps: 
         [0040]    Step  502 : Start; 
         [0041]    Step  504 : Receive the luminance values of the first sub-pixel R 4 , the second sub-pixel G 4 , the third sub-pixel B 4  and the fourth sub-pixel W 4  of the pixel four P 4  (or namely fifth pixel); 
         [0042]    Step  506 : Is the luminance value of the first sub-pixel R 5  of the pixel five P 5  (or namely sixth pixel) at least the second predetermined threshold value TH 2  substantially more than the luminance value of the first sub-pixel R 4  of the pixel four P 4  having the pixel five be the pixel on the column after and the same row as the pixel four P 4  (or namely fifth pixel), the luminance value of the second sub-pixel G 1  of the pixel one P 1  at least the third predetermined threshold value TH 3  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4  having the pixel one P 1  (or namely second pixel) be a pixel on the same column as and the row above the pixel four P 4  (or namely fifth pixel), the luminance value of a second sub-pixel G 2  of the pixel two P 2  (or namely third pixel) at least the third predetermined threshold value TH 3  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4  having the pixel two P 2  be the pixel on the column after and the row above the pixel four P 4 , and/or the luminance value of a second sub-pixel G 5  of the pixel five P 5  (or namely sixth pixel) at least the third predetermined threshold value TH 3  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4  having the pixel five P 5  be the pixel on the column after and the same row as the pixel four P 4 ? If so, go to step  508 ; If not, go to step  510 ; 
         [0043]    Step  508 : Control the fourth sub-pixel W 4  of the pixel four P 4  to display an image with a luminance value substantially less than the luminance value of the fourth sub-pixel W 4  of the pixel four P 4 ; Go to step  514 ; 
         [0044]    Step  510 : Is the luminance value of the fourth sub-pixel W 3  of the pixel three P 3  (or namely fourth pixel) at least the first predetermined threshold value TH 1  substantially more than the luminance value of the fourth sub-pixel W 4  of the pixel four P 4  having the pixel three P 3  be a pixel on the column before and the same row as the pixel four P 4 ? If so, go to step  512 ; If not, go to step  514 ; 
         [0045]    Step  512 : Control the first sub-pixel R 4  of the pixel four P 4  to display an image with a luminance value substantially less than the luminance value of the first sub-pixel R 4  of the pixel four P 4 , and control the second sub-pixel G 4  of the pixel four P 4  to display an image with the luminance value substantially less than the luminance value of the second sub-pixel G 4  of the pixel four P 4 ; 
         [0046]    Step  514 : End. 
         [0047]    Since the sub-pixel positioning used in the methods shown in  FIG. 2  and  FIG. 5  are different, the comparison approach of the adjacent pixels is different. For the method shown in  FIG. 5 , in Step  506 , the pixel four P 4  (or namely fifth pixel) is compared to the pixel five P 5  (or namely sixth pixel) by comparing the respective first sub-pixels and/or the pixel four P 4  is compared to the pixel one P 1  (or namely second pixel), the pixel two P 2  (or namely third pixel) and the pixel five P 5  (or namely sixth pixel) by comparing the respective second sub-pixels. If the luminance value of the first sub-pixel R 5  of the pixel five P 5  is not at least the second predetermined threshold value TH 2  substantially more than the luminance value of the first sub-pixel R 4  of the pixel four P 4  and the luminance values of the second sub-pixel G 1  of the pixel one P 1 , the second sub-pixel G 2  of the pixel two P 2 , and the second sub-pixel G 5  of the pixel five P 5  are not at least the third predetermined threshold value TH 3  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4 , then proceed to step  510 . In step  510 , the fourth sub-pixel W 3  of the pixel three P 3  (or namely fourth pixel) is compared to the fourth sub-pixel W 4  of the pixel four P 4  to see if the luminance value fourth sub-pixel W 3  of the pixel three P 3  is at least the first predetermined threshold value substantially more than the luminance value of the fourth sub-pixel W 4  of the pixel four P 4 . In step  508 , the luminance value of the fourth sub-pixel W 4  can be substantially reduced by 1% to 50%. In step  512 , the luminance values of the first sub-pixel R 4  and the second sub-pixel G 4  of pixel four P 4  can be substantially reduced by 1% to 50%. 
         [0048]    Please refer to  FIG. 6 .  FIG. 6  illustrates a flowchart of a fourth embodiment of the method of displaying image of the display panel  400 . As shown in  FIG. 6 , the method of displaying image of the display panel  400  may include and is not limited to the following steps: 
         [0049]    Step  602 : Start; 
         [0050]    Step  604 : Receive the luminance values of the first sub-pixel R 4 , the second sub-pixel G 4 , the third sub-pixel B 4  and the fourth sub-pixel W 4  of the pixel four P 4  (or namely fifth pixel); 
         [0051]    Step  606 : Is the luminance value of the fourth sub-pixel W 3  of the pixel three P 3  (or namely fourth pixel) at least the first predetermined threshold value TH 1  substantially more than the luminance value of the fourth sub-pixel of the pixel four P 4  (or namely fifth pixel) having the pixel three be a pixel on the column before and the same row as the pixel four P 4 ? If so, go to step  608 ; If not, go to step  610 ; 
         [0052]    Step  608 : Control the first sub-pixel R 4  of the pixel four P 4  to display an image with a luminance value substantially less than the luminance value of the first sub-pixel R 4  of the pixel four P 4 , and control the second sub-pixel G 4  of the pixel four P 4  to display an image with the luminance value substantially less than the luminance value of the second sub-pixel G 4  of the pixel four P 4 ; Go to step  614 ; 
         [0053]    Step  610 : Is the luminance value of the first sub-pixel R 5  of the pixel five P 5  (or namely sixth pixel) at least the second predetermined threshold value TH 2  substantially more than the luminance value of the first sub-pixel R 4  of the pixel four P 4  having the pixel five P 5  be the pixel on the column after and the same row as the pixel four P 4 , the luminance value of the second sub-pixel G 1  of the pixel one P 1  (or namely second pixel)at least the third predetermined threshold value TH 3  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4  having the pixel one P 1  be a pixel on the same column as and the row above the pixel four P 4 , the luminance value of the second sub-pixel G 2  of the pixel two P 2  (or namely third pixel) at least the third predetermined threshold value TH 3  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4  having the pixel two P 2  be the pixel on the column after and the row above the pixel four P 4 , and/or the luminance value of the second sub-pixel G 5  of the pixel five P 5  at least the second predetermined threshold value TH 2  substantially more than the luminance value of the second sub-pixel G 4  of the pixel four P 4  having the pixel five P 5  be the pixel on the column after and the same row as the pixel four P 4 ? If so, go to step  612 ; If not, go to step  614 ; 
         [0054]    Step  612 : Control the fourth sub-pixel W 4  of the pixel four P 4  to display an image with a luminance value substantially less than the luminance value of the fourth sub-pixel W 4  of the pixel four P 4 ; 
         [0055]    Step  614 : End. 
         [0056]    For the method shown in  FIG. 6 , step  606  first compare the fourth sub-pixels of the pixel four P 4  (or namely fifth pixel) and the pixel three P 3  (or namely fourth pixel). If the luminance value of the fourth sub-pixel W 3  of the pixel three P 3  is not is at least the first predetermined threshold value TH 1  substantially more than the luminance value of the fourth sub-pixel W 4  of the pixel four P 4 , then the method will proceed to compare the first sub-pixels of the pixel four P 4  and the pixel five P 5  (or namely sixth pixel) and/or the second sub-pixels of the pixel one P 1  (or namely second pixel), the pixel two P 2  (or namely third pixel) and the pixel five P 5  (or namely sixth pixel) with the second sub-pixel G 4  of the pixel four P 4 . Furthermore, in step  608 , the luminance values of the first sub-pixel R 4  and the second sub-pixel G 4  of pixel four P 4  can be substantially reduced by 1% to 50%. In step  612 , the luminance value of the fourth sub-pixel W 4  can be substantially reduced by 1% to 50%. 
         [0057]    The embodiments of the present invention can adjust the luminance values of the plurality of sub-pixels in order to reduce the bright line effect on display panels. 
         [0058]    Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.