Abstract:
A method is provided. The method includes displaying a first image pixel on a first display pixel of a plurality of display pixels of a monitor, and displaying a second image pixel following the first image pixel on a portion of sub-pixels of the first display pixel and a portion of sub-pixels of a second display pixel so as to avoid loss of image data when displaying the image pixels on a monitor of a small resolution.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to a monitor, and more particularly, to a method for adjusting the visual qualities of images displayed on a monitor.  
         [0003]     2. Description of the Prior Art  
         [0004]     Organic light emitting diodes (OLEDs) are a branch of modern monitor technologies. The light emitting theory is different from conventional monitor technologies such as cathode ray tube (CRT), liquid crystal display (LCD), plasma display panel (PDP), field emission display (FED), liquid crystal on silicon (LCOS). OLEDs utilize organic materials to construct an LED component and have the characteristics of self light emitting. As the development of OLEDs advances, the OLED technology is extensively utilized with monitor products. Because OLEDs themself emit light, the parts used in the manufacturing of OLEDs can be reduced, and therefore reduces costs. Thus, the OLED technology is suitable for next generation monitors.  
         [0005]     The manufacturing conditions and the precision of the machinery utilized in the process of manufacturing flat-screen monitors are limited. As a result, the monitor resolution cannot be high. Take the OLEDs as an example, in the process of manufacturing OLED products, organic films are usually formed by the method of vapor evaporation deposition. This process requires a metal shield mask. The metal shield mask is different from the photo mask used in semi-conductor technology as known to those skilled in the art. As the precision of the metal shield mask cannot be compared to that of the photo mask, the resolution of the OLED products cannot be high. For example, the current technology can only produce 120-150 display pixels per inch (i.e., 120-150 ppi); hence, the competitiveness of the OLED products is lowered due to its picture resolution specification.  
         [0006]     The conventional image display method displays image signals on a monitor with the same resolution. Please refer to  FIG. 1 . The right half of  FIG. 1  represents an image signal  12 , and the left half of  FIG. 1  represents a monitor  10  having a corresponding resolution. The image signal  12  is transmitted to the monitor  10  through an electronic system. For example, when the resolution of the monitor  10  is n*m the monitor  10  will include nth display pixel rows, and each display pixel row includes m*3 display sub-pixels, wherein “*3” represents each display pixel having display sub-pixels of three basic colors red (R), green (G), and blue (B). The electronic system is required to transmit each image, which is the image signal  12  (including n*m*3 data), in a one-by-one manner to display the image on the display pixels of the monitor  10 . As illustrated in  FIG. 1 , a first, a second, a third, and a fourth image pixel of a first image pixel row of the image signal  12  is respectively displayed on a first, a second, a third, and a fourth display pixel of a first display pixel row of the monitor  10 . In general, an nth image pixel row of the image signal  12  is displayed on an nth display pixel row of the monitor  10 . Therefore the ratio of the resolution of the monitor  10  to that of the image signal  12  is 1:1.  
         [0007]     However, as the application of monitors has progressed, the information volume presented via the monitors has also increased. Hence, the demands for better monitors have also increased. This is especially true of the demand placed on image resolution. Demand for improved image resolution indicates that display pixels required by the monitor must be increased. Therefore the gap between each display pixel becomes narrower, and the manufacture feasibility and yield of high-resolution flat-screen monitors are reduced.  
         [0008]     Please refer to  FIG. 2 , where the right half of  FIG. 2  represents an image signal  12 , and the left half of  FIG. 2  represents another monitor  20 . The resolution of the monitor  20  does not equal to that of the image signal  12 . In  FIG. 2 , resolution of the monitor  20  is n*m/6. In other words, the monitor  20  includes (n/2) th  horizontal display pixel rows, and each display pixel row includes (m/3)*3 display sub-pixels. Here “*3” also represents each display pixel having display sub-pixels of three basic colors: red (R), green (G), and blue (B). Note that the resolution of the monitor  20  is one-sixth that of the monitor  10 , therefore, the n*m*3 data of the image signal  12  cannot be displayed correspondingly in a one-to-one manner on the display pixels of the monitor  20 . On the contrary, only a portion of the image signal  12  can be displayed correspondingly on the display pixels of the monitor  20 . As illustrated in  FIG. 2 , in an actual display period (illustrated in  FIG. 6 ), a first and a fourth image pixel of a first image pixel row of the image signal  12  can be respectively displayed on a first and a second display pixel of a first display pixel row of the monitor  20 , but a second and a third image pixel do not correspond to any display pixels of the first display pixel row of the monitor  20 , therefore they are abandoned (i.e., discarded). On the other hand, an (n−1) th  image pixel row of the image signal  12  can be displayed on an (n/2) th  display pixel row of the monitor  20 , but an nth image pixel row does not correspond to any display pixel row of the monitor  20 , therefore they are abandoned (i.e., discarded).  
       SUMMARY OF THE INVENTION  
       [0009]     The claimed invention discloses a method for adjusting visual qualities of images displayed on a monitor, the method comprises the following steps: generating a grey scale value of an image pixel row according to weight values and grey scale values of a series of image pixel rows, wherein the weight value of each image pixel row of the series of image pixel rows is greater than 0; displaying a first image pixel of the image pixel row generated in the above-mentioned step on a first display pixel of a plurality of display pixels of the monitor at a first display sub-period of a first display period; and displaying a second image pixel following the first image pixel of the image pixel row generated in the above-mentioned step on a portion of sub-pixels x 1  of the first display pixel and a portion of sub-pixels y 1  of a second display pixel of the plurality of display pixels at a second display sub-period of the first display period. In the present invention, a portion of sub-pixels can be one, two or more sub-pixels of the display pixel.  
         [0010]     The claimed invention further discloses a method for adjusting visual qualities of images displayed on a monitor, the method comprises the following steps: generating a grey scale value of an image pixel row according to weight values and grey scale values of a series of image pixel rows; and displaying the image pixel row generated in the above-mentioned step on a display pixel row of the monitor; wherein the weight value of each image pixel row of the series of image pixel rows is greater than 0.  
         [0011]     The claimed invention further discloses another method for adjusting visual qualities of images displayed on a monitor, the method comprises the following steps: displaying a first image pixel on a first display pixel of a plurality of display pixels of the monitor at a first display sub-period of a first display period; displaying a second image pixel following the first image pixel on a portion of sub-pixels x 1  of the first display pixel and a portion of sub-pixels y 1  of a second display pixel of the plurality of display pixels at a second display sub-period of the first display period; displaying a third image pixel following the second image pixel on a portion of sub-pixels x 2  of the portion of sub-pixels x 1  of the first display pixel, the portion of sub-pixels y 1  of the second display pixel, and a portion of sub-pixels y 2  of the second display pixel other than the portion of sub-pixels y 1  of the second display pixel; and displaying corresponding image pixels at a second display period following the first display period, wherein a display sequence of display sub-periods of the second display period is opposite to a display sequence of the display sub-periods of the first display period.  
         [0012]     The claimed invention discloses a monitor comprising a display panel, a receiving unit, and a control unit. The display panel comprises a plurality of display pixels, each display pixel comprises a plurality of display sub-pixels; the receiving unit for receiving an image signal, the image signal comprises a plurality of image pixel rows, each image pixel row comprises a plurality of image pixels, each image pixel comprises a plurality of image sub-pixels corresponding to display sub-pixels; and a control unit for displaying an image pixel of the image signal received by the receiving unit on the display panel by mapping the image sub-pixel to the corresponding display sub-pixel.  
         [0013]     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  
       [0014]      FIG. 1  illustrates a diagram of an image signal and a resolution corresponding to a conventional monitor.  
         [0015]      FIG. 2  illustrates a diagram of the image signal of  FIG. 1  and a conventional non-corresponding resolution monitor.  
         [0016]      FIG. 3  through  FIG. 5  illustrates diagrams of an image signal and a monitor of a first embodiment according to the present invention.  
         [0017]      FIG. 6  illustrates an operating time diagram of the monitor.  
         [0018]      FIG. 7  illustrates a diagram of the monitor of  FIG. 3  displaying the image signal of  FIG. 2 .  
         [0019]      FIG. 8A, 8B  and  8 C illustrate diagrams of display sub-pixels of display pixel of a monitor of the present invention.  
         [0020]      FIG. 9  illustrates an operating time diagram of a monitor according to a second embodiment of the present invention.  
         [0021]      FIG. 10  illustrates a diagram of an image signal and a monitor of a third embodiment according to the present invention.  
         [0022]      FIG. 11  illustrates a diagram of the image signal and a monitor of a fourth embodiment according to the present invention.  
         [0023]      FIG. 12  illustrates a functional block diagram of a monitor according to the present invention. 
     
    
     DETAILED DESCRIPTION  
       [0024]     The method and related monitor of the present invention utilize a plurality of display sub-pixels to display a plurality of sub-pixels of an image signal onto the monitor to adjust the visual qualities of images displayed on the monitor.  
         [0025]     Please refer to  FIG. 3  through  FIG. 6 .  FIG. 3  through  FIG. 5  illustrates diagrams of an image signal  12  and a monitor  50  of a first embodiment according to the present invention.  FIG. 6  illustrates a timing chart of display sub-periods of the monitor  50  according to the present invention. The monitor  50  includes n horizontal display pixel rows, and each display pixel of the monitor  50  includes (m/3)*3 display sub-pixels. It further includes a red (R) display sub-pixel  52 , and a green (G) display sub-pixel  54 . This is in contrast to the conventional monitor  20 , which only includes (m/3)*3 display sub-pixels. Similarly, each display pixel of the monitor  50  also includes display sub-pixels of three basic colors: red (R), green (G), and blue (B).  
         [0026]     In the first embodiment of the present invention, the monitor  50  includes a display panel  56 , a receiving unit  58 , and a control unit  60 .  FIG. 12  illustrates a functional block diagram of the monitor  50 . The display panel  56  includes nth display pixel rows, each display pixel row includes m/3 display pixels and two additional display sub-pixels. Each display pixel includes three display sub-pixels; the receiving unit  58  is utilized for receiving an image signal  12 , the image signal  12  includes nth image pixel rows. Each image pixel row includes m th  image pixels. Each image pixel includes three image sub-pixels; the control unit  60  is utilized for displaying each image pixel of the image signal received by the receiving unit  58  on the display panel  56  in a sub-pixel by sub-pixel manner.  
         [0027]     The operation of the monitor  50  is explained in the following section. At a first display sub-period (where the first sub-period is about one third of the display period), a first image pixel of a first image pixel row of the image signal  12  is still being displayed on a first display pixel of a first display pixel row of the monitor  50 . In other words, image sub-pixels R, G, and B of the first image pixel of the first image pixel row of the image signal  12  are respectively displayed on R, G, and B sub-pixels of the first display pixel of the first display pixel row of the monitor  50  as illustrated in  FIG. 3 . At a second display sub-period (where the second sub-period is about one third of the display period), a second image pixel of the first image pixel row of the image signal  12  is displayed on the G, B display sub-pixels of the first display pixel and an R display sub-pixel of a second display pixel of the first display pixel row as illustrated in  FIG. 4 . In other words, the G, B display sub-pixels of the first display pixel and the R display sub-pixel of the second display pixel of the first display pixel row respectively display G, B, and R image sub-pixels of the second image pixel of the first image pixel row of the image signal  12 . Furthermore, at a third display sub-period (where the third sub-period is about one third of the display period), a third image pixel of the first image pixel row of the image signal  12  is displayed on the B display sub-pixel of the first display pixel and the R and a G display sub-pixels of the second display pixel of the first display pixel row as illustrated in  FIG. 5 .  
         [0028]     In general, at the first display sub-period, a fourth, a seventh, . . . , and an (m−2) th  image pixels of the first image pixel row of the image signal  12  are respectively displayed on a second, a third, . . . , and an (m/3) th  display pixels of the first display pixel row of the monitor  50  as illustrated in  FIG. 3 . At the second display sub-period, a fifth, an eighth, and an (m−1) th  image pixels of the first image pixel row of the image signal  12  are respectively displayed on the G, B display sub-pixels of the second display pixel and an R display sub-pixel of a third display pixel, G, B display sub-pixels of the third display pixel and an R display sub-pixel of a fourth display pixel, . . . , and G, B display sub-pixels of an (m/3) th  display pixel and the additional R display sub-pixel  52  of the first display pixel row of the monitor  50 . At the third display sub-period, a sixth, a ninth, . . . , and an m th  image pixels of the first image pixel row of the image signal  12  are respectively displayed on the B display sub-pixel of the second display pixel and the R, G display sub-pixels of the third display pixel, the B display sub-pixel of the third display pixel and the R and a G display sub-pixels of a fourth display pixel, . . . , and the B display sub-pixel of the (m/3) th  display pixel and the additional R display sub-pixel  52  and G display sub-pixel  54  of the first display pixel row of the monitor  50 .  
         [0029]     Equivalently, the image signal  12  is split into three image sub-signals: a first image sub-signal  14  includes a first, a fourth, a seventh, . . . , (m−2) th  image pixels of each row of the image signal  12 ; a second image sub-signal  16  includes a second, a fifth, an eighth, . . . , (m−1) th  image pixels of each row of the image signal  12 ; a third image sub-signal  18  includes a third, a sixth, a ninth, . . . , m th  image pixels of each row of the image signal  12 . The monitor  50  displays the first image sub-signal  14  of the image signal  12  at the first display sub-period, the second image sub-signal  16  at the second display sub-period, the third image sub-signal  18  at the third display sub-period as illustrated in  FIG. 7 . In this way, although each display pixel row of the monitor  50  includes only m/3 display pixels and two additional display sub-pixels the monitor  50  still displays each image pixel of the image signal  12  in a sub-pixel by sub-pixel manner. Equivalently, the resolution in the horizontal direction of the monitor  50  is identical to that of the image signal  12 . In another words, the resolution of the monitor  50  is triple the resolution of the monitor  20 , even though the number of display pixels of each display pixel row of both monitor  50  and  20  are identical.  
         [0030]     In the first embodiment of the present invention each pixel of the monitor  50  contains 3 sub-pixels, i.e. R, G, B sub-pixels, arranged in a straight line. The first pixel is red (R), the second is green (G) and the last is blue (B). However in the monitors of the present invention the pixels are not limited to contain just 3 sub-pixels. They can contain more than 3 sub-pixels. For example, besides R, G, B sub-pixels each display pixel of the monitor of the present invention can also contain a white (W) display sub-pixel. Furthermore, in the monitor of the present invention, the display sub-pixels of each display pixel are not required to be arranged in a straight-line. For example, the display sub-pixels of each display pixel of the monitor can be in a triangular arrangement with respect to each other, or can be in a straight-line or rectangular arrangement as illustrated in  FIG. 8A, 8B ,  8 C. In  FIG. 8A , each display pixel of the monitor includes 3 display sub-pixels in a triangular arrangement, in  FIG. 8B , each display pixel of the monitor includes four display sub-pixels in a straight-line arrangement, and in  FIG. 8C , each display pixel of the monitor includes four display sub-pixels in a rectangular arrangement.  
         [0031]     As mentioned above the monitor of the present invention can split a display period into approximately three equal display sub-periods and display the first sub-signal  14 , second sub-signal  16 , and third image sub-signal  18  at respective sub-period. Furthermore, the monitor can also split the display period into three unequal display sub-periods or two equal or unequal display sub-periods. As an example, the display period can be split into two equal display sub-periods. At a first display sub-period (where the first display sub-period is half of a display period), the first image sub-signal  14  of the image signal  12  (includes a first, third, fifth, . . . , image pixels of each row of the image signal  12 ) is respectively displayed on the first, second, third, . . . , display pixels of each row of the monitor of the present invention. At a second display sub-period (where the second display sub-period is half of a display period), the second image sub-signal  16  of the image signal  12  (includes a second, fourth, sixth, . . . , image pixels of each row of the image signal  12 ) is respectively displayed on B display sub-pixel of the first display pixel and R, G display sub-pixels of the second display pixel, B display sub-pixels of the second display pixel and R, G display sub-pixels of the third display pixel, B display sub-pixels of the third display pixel and R, G display sub-pixels of the fourth display pixel, . . . , of each row of the monitor of the present invention (in the second display sub-period, the second image sub-signal  16  of the image signal  12  can also be displayed on G, B display sub-pixels of the first display pixel and R display sub-pixel of the second display pixel, G, B display sub-pixels of the second display pixel and R display sub-pixel of the third display pixel, G, B display sub-pixels of the third display pixel and R display sub-pixel of the fourth display pixel, . . . ). In this way, the ratio of the resolution of the monitor of the present invention to that of the image signal  12  is 1:2.  
         [0032]     In the first embodiment, each row of the monitor  50  has (m/3)*3 display sub-pixels, an additional R display sub-pixel  52  and an additional G display sub-pixel  54 . However the monitors of the present invention can have neither the R display sub-pixel  52  nor the G display sub-pixel  54 , or they can contain just the R display sub-pixel  52 . When the monitors of the present invention do not have R display sub-pixel  52  and G display sub-pixel  54 , the first, fourth, seventh, . . . , and (m−2) th  image pixels of each row of the image signal  12  are displayed on the first, second, third, . . . , and (m/3) th  display pixels of each row of the monitors at the first display sub-period. At the second display sub-period the second, fifth, eighth, . . . , (m−4) th  image pixels are displayed on G, B sub-pixels of the first display pixel and R sub-pixel of the second display pixel, G, B sub-pixels of the second display pixel and R sub-pixel of the third display pixel, G, B sub-pixels of the third display pixel and R sub-pixel of the fourth display pixel, . . . , G, B sub-pixels of the [(m/3)−1] th  display pixel and R sub-pixel of the (m/3) th  display pixel. Because the monitors do not have a R display sub-pixel  52 , for (m−1) th  image pixel, only the G, B image sub-pixels will be displayed on G, B sub-pixels of the (m/3) th  display pixel. Similarly, for the m th  image pixel, only the B image sub-pixel will be displayed on the B sub-pixel of the (m/3) th  display pixel at the third display sub-period.  
         [0033]     Please refer to  FIG. 6  again. In  FIG. 6 , the third image sub-signal  18  at the third display sub-period is correspondingly displayed on B display sub-pixel of each display pixel and R, G display sub-pixels of a following display pixel. The first image sub-signal  14 ′ of another image signal  12 ′ following the image signal  12  is correspondingly displayed on R, G, B display sub-pixels of each display pixel at the first display sub-period of the following display period. However, the sequence of displaying the image sub-signals  14 ,  16  and  18  in the alternating display period can be altered.  
         [0034]     Please refer to  FIG. 9 .  FIG. 9  illustrates a timing chart of display sub-periods of a monitor according to a second embodiment of the present invention. As illustrated in  FIG. 9 , after the third image sub-signal  18  is correspondingly displayed on B display sub-pixel of each display pixel and R, G display sub-pixels of the following display pixel at the third display sub-period, the monitor displays the other image signal  12 ′ following the image signal  12  in an opposite image sub-signal sequence. In other words, the image sub-signal display sequence of the image signal  12 ′ starts from the third image sub-signal  18 ′, then the second image sub-signal  16 ′, and last the first image sub-signal  14 ′, wherein the third image sub-signal  18 ′ is still correspondingly displayed on B sub-pixel of each display pixel and R, G sub-pixels of the following display pixel, the second image sub-signal  16 ′ is displayed on G, B sub-pixels of each display pixel and R sub-pixel of the following display pixel, and the first image sub-signal  14 ′ is displayed on each display pixel. Hence, the image signal  12  can be transformed to image  12 ′ as smooth as possible.  
         [0035]     The above-mentioned method can improve visual qualities of images of the monitor of the present invention in the horizontal direction. The followings explain how visual qualities of images of the monitor of the present invention can be improved in a vertical direction.  
         [0036]     Please refer to  FIG. 10 .  FIG. 10  illustrates a diagram of an image signal  12  and a monitor  80  of a third embodiment according to the present invention. The monitor  80  is different from the monitor  50  in that the monitor  80  only includes n/2 horizontal display pixel rows. Furthermore, for an easy explanation, each display pixel row of the monitor  80  includes m*3 display sub-pixels.  
         [0037]     Note that the number of display pixel rows of the monitor  80  utilized for displaying the image signal  12  is only half that of the image pixel rows of the image signal  12 . Therefore in order to prevent losing any image pixel row data of the image signal  12 , in the third embodiment of the present invention, image pixel rows of the image signal  12  that cannot correspond to display pixel rows of the monitor  80  will be equally displayed on the display pixel rows of the monitor  80 .  
         [0038]     The operation of the monitor  80  is explained in the following section. Because the second image pixel row of the image signal has no corresponding display pixel row on the monitor  80  of the third embodiment of the present invention, half signal of the second image pixel row of the image signal  12  is displayed on a first display pixel row of the monitor  80  (the first display pixel row of the monitor  80  corresponds to the first image pixel row of the image signal  12 ). The other half signal of the second image pixel row of the image signal  12  is displayed on the second display pixel row of the monitor  80  (the second display pixel row of the monitor  80  corresponds to the third image pixel row (3=2*2−1) of the image signal  12 ). The first display pixel row of the monitor  80  is required to display the first image pixel row of the image signal  12 , and it is also required to display half signal of the second image pixel row of the image signal  12 . In order to normalize brightness of the image signal  12  displayed on the monitor  80 , the first display pixel row of the monitor  80  displays: (signal of the first image pixel row of the image signal  12 *1+signal of the second image pixel row of the image signal  12 *½)/(1+½)).  
         [0039]     To continue, the other half signal of the remaining second image pixel of the image signal  12  is displayed on the second display pixel row of the monitor  80 . The second display pixel row of the monitor  80  further displays the corresponding third image pixel row of the image signal  12 , and half signal of the fourth image pixel row of the image signal  12 . Similarly, in order to normalize brightness of the image signal  12  displayed on the monitor  80 , the second display pixel row of the monitor  80  displays: (signal of the second image pixel row of the image signal  12 *½+signal of the third image pixel row of the image signal  12 *1+signal of the fourth image pixel row of the image signal  12 *½)/(½+1+½)). In general, a k th  display pixel row of the monitor  80  correspondingly displays the (k*2−1) th  image pixel row of the image signal  12 , and also displays half signal of the (k*2−2) th  image pixel row (a previous image pixel row of the (k*2−1) th  image pixel) of the image signal  12 , and half signal of the (k*2) th  image pixel row (a next image pixel row of the (k*2−1) th  image pixel row) of the image signal  12  and so forth. Similarly, in order to normalize brightness of the image signal  12  displayed on the monitor  80 , the k th  display pixel row of the monitor  80  displays: (signal of the (k*2−2) th  image pixel row of the image signal  12 *  1 / 2 +signal of the (k*2−1) th  image pixel row of the image signal  12 *1+signal of the (k*2) th  image pixel row of the image signal  12 *  1 / 2 )/(½+1+½)). At last, the (n/2) th  display pixel row of the monitor  80  correspondingly displays the (n/2*2−1) th  image pixel row of the image signal  12 , and also displays half signal of the (n/2*2−2) th  image pixel row and half signal of the (n/2*2) th  image pixel row of the image signal  12 . Similarly, in order to normalize brightness of the image signal  12  displayed on the monitor  80 , (n/2) th  display pixel row of the monitor  80  displays: (signal of the (n−2)th image pixel row of the image signal  12 *½+signal of the (n−1) th  image pixel row of the image signal  12 *1+signal of the n th  image pixel row of the image signal  12 *½)/(½+1+½)).  
         [0040]     According to the image pixel row weighted method mentioned previously, the monitor  80  utilizes almost all the image signal  12  during display in spite that the number of display pixel rows of the monitor  80  only include half the number of image pixel rows of the image signal  12 . Although the ratio of the (vertical) resolution of the monitor  80  to that of the image signal  12  is 1:2, the visual qualities of images displayed on the monitor  80  is improved by the weighted method.  
         [0041]     In the third embodiment according to the present invention, the k th  display pixel row corresponds to the (2*k−1) th  image pixel row of the image signal  12 . Alternatively the k th  display pixel row of the monitor  80  can correspond other image pixel rows of the image signal  12 .  
         [0042]     Please refer to  FIG. 11 .  FIG. 11  illustrates a diagram of the image signal  12  and a monitor  90  of a fourth embodiment according to the present invention. The monitor  90  also includes n/2 horizontal display pixel rows. Furthermore, for an easy explanation, each display pixel row of the monitor  90  also includes m*3 display sub-pixels.  
         [0043]     Because the number of display pixel rows of the monitor  90  utilized for displaying the image is only half that of the image pixel rows of the image signal  12 , therefore in order to prevent losing any image pixel row data of the image signal  12 , in the fourth embodiment, image pixel rows of the image signal  12  that cannot correspond to the display pixel rows of the monitor  90  will be equally displayed on the display pixel rows of the monitor  90 .  
         [0044]     The operation of the monitor  90  is explained in the following section. Because the first image pixel row and the third image pixel row of the image signal  12  have no corresponding display pixel row on the monitor  90 , therefore, in the fourth embodiment of the present invention, half signal of the first image pixel row and half signal of the third image pixel row of the image signal  12  are displayed on a first display pixel row of the monitor  90 . The first display pixel row of the monitor  90  corresponds to the second image pixel row (2=1*2) of the image signal  12 . In order to normalize brightness of the image signal  12  displayed on the monitor  90 , the first display pixel row of the monitor  90  displays: (signal of the first image pixel row of the image signal  12 *½+signal of the second image pixel row of the image signal  12 *1+signal of the third image pixel row of the image signal  12 *½)/(½+1+½)). In general, a k th  display pixel row of the monitor  90  correspondingly displays the (k*2) th  image pixel row of the image signal  12 , and also displays half signal of the (k*2−1) th  image pixel row (which is a previous image pixel row of the (k*2) th  image pixel row) of the image signal  12 , and half signal of the (k*2+1) th  image pixel row (a next image pixel row of the (k*2) th  image pixel row) of the image signal  12 . Similarly, in order to normalize brightness of the image signal  12  displayed on the monitor  90 , the k th  display pixel row of the monitor  90  displays: (signal of the (k*2−1) th  image pixel row of the image signal  12 *½+signal of the (k*2) th  image pixel row of the image signal  12 *1+signal of the (k*2+1) th  image pixel row of the image signal  12 *½)/(½+1+½)). At last, the (n/2) th  display pixel row of the monitor  90  correspondingly displays the (n/2*2) th  image pixel row of the image signal  12 , and also displays half signal of the (n/2*2−1) th  image pixel row of the image signal  12 . Similarly, in order to normalize brightness of the image signal  12  displayed on the monitor  90 , the (n/2) th  display pixel row of the monitor  90  displays: (signal of the (n−1) th  image pixel row of the image signal  12 *½+signal of the n th  image pixel row of the image signal  12 *1)/(½+1)).  
         [0045]     According to the image pixel row weighted method previously mentioned, the monitor  90  still utilizes almost all the image signal  12  during display in spite that the number of display pixel rows of the monitor  90  is only half that of the image signal  12 . Although the (vertical) ratio of the resolution of the monitor  90  to that of the image signal  12  is 1:2, the visual qualities of images displayed on the monitor  90  can still be improved by the weighted method.  
         [0046]     In comparison to the prior art, the present invention utilizes the display sub-period method, the image pixel row weighted method, and the pixel sharing method (which is to display a plurality of image pixels of an image signal on a monitor in a sub-pixel by sub-pixel manner) to display image without loosing any image data even though the monitor resolution is not high.  
         [0047]     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.