BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 (Prior Art) is a block diagram of a down-scaling process of a conventional flat display;
FIG. 2 is a block diagram of a flat display according to a first embodiment of the present invention;
FIG. 3 shows distribution of pixel data of a current image frame according to a first example;
FIG. 4 shows distribution of the pixel data of a dynamic image frame with low resolution according to the first embodiment of the present invention;
FIG. 5 shows distribution of pixel data of a dynamic image frame with low resolution according to a second embodiment of the present invention;
FIG. 6 shows distribution of pixel data of a dynamic image frame with low resolution according to a third embodiment of the present invention;
FIG. 7 shows distribution of pixel data of a current image frame of a second example;
FIG. 8 shows distribution of pixel data of a dynamic image frame with low resolution according to a fourth embodiment of the present invention;
FIG. 9 shows distribution of pixel data of a dynamic image frame with low resolution according to a fifth embodiment of the present invention; and
FIG. 10 shows distribution of pixel data of a current image frame according to a sixth embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a driving method of a flat display for displaying more pixel data by a few pixels. The distortion of the transformed image frame is alleviated and not observed easily.
A flat display and a driving method thereof are provided by the present invention. Please referring to FIG. 2, a block diagram of a flat display according to a first embodiment of the present invention is illustrated in FIG. 2. The flat display 20 receives a current image frame IF(n), and then the current image frame IF(n) is used by a dynamic detection circuit 22. For example, the current image frame IF(n) and a previous image frame IF(n−1) stored in a storage device 21 are compared based on conventional brightness profile pattern difference (BPPD) for determining if the current image frame IF(n) is a static image frame SIF or a dynamic image frame MIF.
When the current image frame IF(n) is a static image frame SIF, then the static image frame SIF is transmitted to a down-scaling device 23. Then, a static image frame SIF′ with lower resolution is outputted. Afterwards, a driving circuit 26 drives a panel 28 according to the static image frame SIF′ with lower resolution.
When the current image frame IF(n) is a dynamic image frame MIF, the dynamic image frame MIF is transmitted to a pixel data rearrangement device 24. The dynamic image frame MIF is rearranged to output a dynamic image frame MIF′ with lower resolution. Later, the driving circuit 26 drives the panel 28 according the dynamic image frame MIF′ with lower resolution. What is worth noticing is that the present invention uses fewer pixels to display more pixel data. Therefore, even through the dynamic image frame ‘MIF’ has lower resolution, the distortion of the dynamic image frame MIF′ with lower resolution is alleviated and not able to be observed so easily.
A driving method of a flat display is provided by the present invention. The flat display includes N pixels in each row, that is, 3N sub-pixels for displaying M pixel data in each row of an image frame on the flat display in different divisions. M and N are positive integers, and M is larger than N. The driving method of a flat display includes following steps. First, in a first time division, the N pixels display N pixel data out of the M pixel data. Next, at least in a second time division, the N pixels display the remaining M-N pixel data.
Please referring to FIG. 3, distribution of the pixel data of the current image frame according to a first example is illustrated in FIG. 3. For example, each row of the flat display 30 includes four pixels, that is, twelve sub-pixels SP1˜SP12, for displaying four pixel data (R1˜R4, G1˜G4 and B1˜B4) in a time period T. Please referring to FIG. 4, distribution of the pixel data of the dynamic image frame with low resolution according to the first embodiment of the present invention is illustrated in FIG. 4. For example, each row of the flat display 40 includes two pixels, that is, 6 sub-pixels SP1˜SP6, for displaying the four pixel data in FIG. 3 in different time divisions.
As shown in FIG. 4, in the first time division t1, the first sub-pixel SP1 displays red data R1 of the first pixel data. The second sub-pixel SP2 displays green data G1 of the first pixel data, and the third sub-pixel SP3 displays blue data B1 of the first pixel data. Meanwhile, the fourth sub-pixel SP4 displays red data R4 of the fourth pixel data. The fifth sub-pixel SP5 displays green data G4 of the fourth pixel data, and the sixth sub-pixel SP6 displays blue data B4 of the fourth pixel data.
In a second time division t2, the first sub-pixel SP1 displays the red data with 255 grey levels, that is, black color. In FIG. 4, “-” represents black color. The second sub-pixel SP2 displays green data G2 of the second pixel data, and the third sub-pixel SP3 displays blue data B2 of the second pixel data. The fourth sub-pixel SP4 displays red data R2 of the second pixel data, and the fifth sub-pixel SP5 displays green data “-” with 255 grey levels. The sixth sub-pixel SP6 displays blue data “-” with 255 grey levels.
In a third time division t3, the first sub-pixel SP1 display red data “-” with 255 grey levels. The second sub-pixel SP2 displays green data “-” with 255 grey level, and the third sub-pixel SP3 displays blue data B3 of the third pixel data. The fourth sub-pixel SP4 displays red data R3 of the third pixel data. The fifth sub-pixel SP5 displays green data G3 of the third pixel data, and the sixth sub-pixel SP6 displays blue data “-” with 255 grey levels.
The above method uses a few pixels to display more pixel data in different time divisions. Because human eye retains an image frame for a fraction of a second after it views the image frame, the persistence of vision makes the image frame with low resolution look more saturated and closer to the image frame with original resolution. Therefore, distortion is alleviated.
Please referring to FIG. 5, distribution of pixel data of a dynamic image frame with low resolution according to a second embodiment of the present invention is illustrated in FIG. 5. For example, each row of a flat display 50 includes 2 pixels, that is, 6 sub-pixels SP1-SP6, for displaying four pixel data (R1˜R4, G1˜G4 and B1˜B4) in FIG. 3.
As shown in FIG. 5, in a first time division t1, the first sub-pixel SP1 displays red data R1 of the first pixel data. The second sub-pixel SP2 displays green data G1 of the first pixel data, and the third sub-pixel SP3 displays blue data B1 of the first pixel data. The fourth sub-pixel SP4 displays red data R4 of the four pixel data, and the fifth sub-pixel SP5 displays green data G4 of the fourth pixel data. The sixth sub-pixel SP6 displays blue data B4 of the fourth pixel data.
In a second time division t2, the first sub-pixel displays red data “-” with 255 grey levels. The second sub-pixel SP2 displays green data G2 of the second pixel data, and the third sub-pixel SP3 displays the average value (B2+B3)/2 of the blue data of the second pixel data and the third pixel data. The fourth sub-pixel SP4 displays the average value (R2+R3)/2 of the red data of the second pixel data and the third pixel data. The fifth sub-pixel SP5 displays green data G3 of the third pixel data, and the sixth sub-pixel SP6 displays blue data “-” with 255 grey levels.
Please referring to FIG. 6, distribution of pixel data of a dynamic image frame with low resolution according to a third embodiment of the present invention is illustrated in FIG. 6. For example, each row of a flat display 60 includes two pixels, that is, six sub-pixels, for displaying fourth pixel data (R1˜R4, G1˜G4 and B1˜B4) in FIG. 3.
As shown in FIG. 6, in a first time division t1, the first sub-pixel SP1 displays red data R1 of the first pixel data, and the second sub-pixel SP2 displays green data G1 of the first pixel data. The third sub-pixel SP3 displays blue data B1 of the first pixel data. The fourth sub-pixel SP4 displays red data R3 of the third pixel data, and the fifth sub-pixel SP5 displays green data G3 of the third pixel data. The sixth sub-pixel SP6 displays blue data B3 of the third pixel data.
In a second time division t2, the first sub-pixel SP1 displays red data “-” with 255 grey levels. The second sub-pixel SP2 displays green data G2 of the second pixel data, and the third sub-pixel SP3 displays blue data B2 of the second pixel data. The fourth sub-pixel SP4 displays red data R2 of the second pixel data, and the fifth sub-pixel SP5 displays green data G4 of the fourth pixel data. The sixth sub-pixel SP6 displays blue data B4 of the fourth pixel data.
What is worth noticing is that the above driving method of the flat display skips the red data R4 of the fourth pixel data. However, the image frame observed by human eyes is not affected.
Please referring to FIG. 7, distribution of pixel data of a current image frame of a second example is illustrated in FIG. 7. A flat display 70 includes at least two rows of pixels. For example, each row includes four pixels. In other words, two rows of the pixels include twenty-four sub-pixels SP101˜SP112 and SP201˜SP212 for displaying eight pixel data (R1˜R8, G1˜G8 and B1˜B8) in a time period T′. Please referring to FIG. 8, distribution of pixel data of a dynamic image frame with low resolution according to a fourth embodiment of the present invention is illustrated in FIG. 8. A flat display 80 includes at least two rows of pixels. For example, each row includes two pixels. In other words, the two rows include twelve sub-pixels, for displaying eight pixel data of the two rows in FIG. 7 in different time divisions on the flat display 80. The sub-pixels SP101˜SP112 of the first row display red data, green data and blue data orderly. The sub-pixels SP201˜SP212 of the second row display red data, green data and blue data orderly.
As shown in FIG. 8, in a first time division t1′, the first sub-pixel SP101 of the first row displays red data R1 of the first pixel data. The second sub-pixel SP102 of the first row displays green data G1 of the first pixel data. The third sub-pixel SP103 of the first row displays blue data B2 of the second pixel data. The fourth sub-pixel SP104 of the first row displays red data R3 of the third pixel data. The fifth sub-pixel SP105 of the first row displays green data G3 of the third pixel data. The sixth sub-pixel SP106 displays blue data B4 of the fourth pixel data. The first sub-pixel SP 201 of the second row displays blue data B1 of the first pixel data. The second sub-pixel SP202 of the second row displays red data R2 of the second pixel data. The third sub-pixel SP203 of the second row displays green data G2 of the second pixel data. The fourth sub-pixel SP204 of the second row displays blue data B3 of the third pixel data. The fifth sub-pixel SP205 of the second row displays red data R4 of the fourth pixel data. The sixth sub-pixel SP206 of the second row displays green data G4 of the fourth pixel data.
In a second time division t2′, the first sub-pixel SP101 of the first row displays red data “-” with 255 grey levels. The second sub-pixel SP102 of the first row displays green data G5 of the fifth pixel data. The third sub-pixel SP103 of the first row displays blue data B6 of the sixth pixel data. The fourth sub-pixel SP104 of the first row displays red data R6 of the sixth pixel data. The fifth sub-pixel SP105 of the first row displays green data G7 of the seventh pixel data. The sixth sub-pixel SP106 of the first row displays blue data “-” with 255 grey levels. The first sub-pixel SP201 of the second row displays blue data B5 of the fifth pixel data. The second sub-pixel SP202 of the second row displays red data R5 of the fifth pixel data. The third sub-pixel SP203 of the second row displays green data G6 of the sixth pixel data. The fourth sub-pixel SP204 of the second row displays blue data B7 of the seventh pixel data. The fifth sub-pixel SP205 of the second row displays red data R7 of the seventh pixel data. The sixth sub-pixel SP206 of the second row displays green data “-” with 255 grey levels.
What is worth noticing is that the above driving method of a flat display skips the eighth pixel data. However, the image frame observed by human eyes is not affected.
Please referring to FIG. 9, distribution of pixel data of a dynamic image frame with low resolution according to a fifth embodiment of the present invention is illustrated in FIG. 9. Compared to the first row of the pixels, the second row of the pixels shifts a distance to the right. The distance is equal to half of the width of one sub-pixel. Other parts of the present embodiment are the same as the fourth embodiment and not described repeatedly.
Please referring to FIG. 10, distribution of pixel data of a current image frame according to a sixth embodiment of the present invention is illustrated in FIG. 10. For example, each two rows of a flat display 100 include four pixels, for displaying the eight pixel data (R1˜R8, G1˜G8 and B1˜B8) in FIG. 7 on the flat display 100 in different time divisions. Each pixel includes four sub-pixels in two rows. The first sub-pixel is disposed to the upper left of the pixel, and the second sub-pixel is disposed to the upper right of the pixel. The third sub-pixel is disposed to the lower left of the pixel, and the fourth sub-pixel is disposed the lower right of the pixel.
As shown in FIG. 10, in a first time division t1′, the first sub-pixel SP1001 of the first pixel displays red data R1 of the first pixel data. The second sub-pixel SP1002 of the first pixel displays green data G1 of the first pixel data. The third sub-pixel SP1003 of the first pixel displays green data G1 of the first pixel data. The fourth sub-pixel SP1004 of the first pixel displays blue data B1 of the first pixel data. The first sub-pixel SP2001 of the second pixel displays red data R2 of the second pixel data. The second sub-pixel SP2002 of the second pixel displays green data G2 of the second pixel data. The third sub-pixel SP2003 of the second pixel displays green data G2 of the second pixel data. The fourth sub-pixel SP2004 of the second pixel displays blue data B2 of the second pixel data. The first sub-pixel SP3001 of the third pixel displays red data R3 of the third pixel data. The second sub-pixel SP3002 of the third pixel displays green data G3 of the third pixel data. The third sub-pixel of the third pixel SP3003 displays green data G3 of the third pixel data. The fourth sub-pixel SP3004 of the third pixel displays blue data B3 of the third pixel data. The first sub-pixel SP4001 of the fourth pixel displays red data R4 of the fourth pixel data. The second sub-pixel SP4002 of the fourth pixel displays green data G4 of the fourth pixel data. The third sub-pixel SP4003 of the fourth pixel displays green data G4 of the fourth pixel data. The fourth sub-pixel SP4004 of the fourth pixel displays blue data B4 of the fourth pixel data.
In a second time division t2′, the first sub-pixel SP1001 of the first pixel displays red data “-” with 255 grey levels. The second sub-pixel SP1002 of the first pixel displays green data G5 of the fifth pixel data. The third sub-pixel SP1003 of the first pixel displays green data “-” with 255 grey levels. The fourth sub-pixel SP1004 of the first pixel displays blue data B5 of the fifth pixel data. The first sub-pixel SP2001 of the second pixel displays red data R5 of the fifth pixel data. The second sub-pixel SP2002 of the second pixel displays green data G6 of the sixth pixel data. The third sub-pixel SP2003 of the second pixel displays green data G5 of the fifth pixel data. The fourth sub-pixel SP2004 of the second pixel displays blue data B6 of the sixth pixel data. The first sub-pixel SP3001 of the third pixel displays red data R6 of the sixth pixel data. The second sub-pixel SP3002 of the third pixel displays green data G7 of the seventh pixel data. The third sub-pixel SP3003 of the third pixel displays green data G6 of the sixth pixel data. The fourth sub-pixel SP3004 of the third pixel displays blue data B7 of the seventh pixel data. The first sub-pixel SP4001 of the fourth pixel displays red data R7 of the seventh pixel data. The second sub-pixel SP4002 of the fourth pixel displays green data “-” with 255 grey levels. The third sub-pixel SP4003 of the fourth pixel displays green data G7 of the seventh pixel data. The fourth sub-pixel SP4004 of the fourth pixel displays blue data “-” with 255 grey levels.
What is worth noticing is that the above driving method of a flat display skips the eighth pixel data.
In the driving method of the above embodiments of the present invention, a few pixels are used for displaying more pixel data. Therefore, distortion of the transformed image frame is alleviated and not observed by human eyes so easily.
While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.
Patent Application
20070252797
