This application claims the benefit of Taiwan application Serial No. 95115360, filed Apr. 28, 2006, the subject matter of which is incorporated herein by reference.
1. Field of the Invention
The invention relates in general to a flat display and a driving method thereof, and more particularly to a flat display using a few pixels for displaying more pixel data and a driving method thereof.
2. Description of the Related Art
Different flat displays can display image frames with different resolutions. For example, a DVD player can display image frames with 640×480 resolution, and a mobile phone screen can display image frames with 320×240 resolution. However, when the mobile phone screen needs to display an image frame with 640×480 resolution, the image frame has to be transformed in order to be displayed in the mobile phone screen with lower resolution. The image frame with 640×480 resolution is down-scaled to match the resolution of the mobile phone screen.
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The invention is directed to a flat display and a driving method thereof. A few pixels are used for displaying more pixel data. As a result, distortion of the transformed image frame is alleviated and not observed easily by human eyes.
According to the present invention, a driving method of a flat display is provided. Each row of the flat display comprises N pixels for displaying M pixel data in one row of an image frame on the flat display in different time divisions. M and N are positive integers, and M is greater than N. A driving method of a flat display comprises following steps. First, in a first time division, 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.
According to the present invention, another driving method of a flat display is provided. The flat display includes at least two rows of pixels. Each two rows includes N pixels for displaying M pixel data in two rows of an image frame on the flat display in different time divisions. M and N are positive integers, and M is greater than N. The driving method of the flat display includes following steps. First, in a first time division, N pixels display the first row of the pixel data out of the M pixel data. Next, in a second time division, the N pixels display the second row of the pixel data out of the M pixel data.
According to the present invention, a flat display including a panel, a storage device, a dynamic detection circuit, a down-scaling device, a pixel data rearrangement device and a driving circuit is provided. The storage device stores a previous image frame. The dynamic detection circuit receives a current image frame and compares the current image frame with the previous image frame to determine if the current image frame is a dynamic image frame or a static image frame. When the current image frame is a static image frame, the down-scaling device is for down-scaling the static image frame and outputting a static image frame with low resolution. When the current image frame is a dynamic image frame, the pixel data rearrangement device is for rearranging the dynamic image frame and outputting a dynamic image frame with low resolution in different time divisions. The driving circuit receives the static image frame with low resolution or the dynamic image frame with low resolution in different time divisions, and outputs those image frames to a panel.
According to the present invention, another driving method of a flat display is provided. First, a current image frame is received. Next, the current image frame is compared with a previous image frame to determine if the current image frame is a dynamic image frame. Then, when the current image frame is a dynamic image frame, the current image frame is rearranged to be a dynamic image frame with low resolution in different time divisions. Afterwards, the dynamic image frame with low resolution in different time divisions is outputted.
The invention will become apparent from the following detailed description of the preferred but non-limiting embodiments. The following description is made with reference to the accompanying drawings.
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
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
As shown in
In a second time division t2, the first sub-pixel SP1 displays the red data with 255 grey levels, that is, black color. In
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
As shown in
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
As shown in
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
As shown in
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
Please referring to
As shown in
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.
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