1. Field of the Invention
The present invention relates to a method for driving a liquid crystal display apparatus, and more particularly to a method for driving a plurality of scan rows of the liquid crystal display apparatus at a same time.
2. Description of the Prior Art
Modern liquid crystal display apparatus usually employ techniques of color filters or a color sequential method to make pixels display specific colors. The color filter includes three colors: red, green and blue in a single pixel. A white light source is employed for penetrating each color filter of the pixel in the liquid crystal area with specific gray levels in order to display specific colors; this is known as color mixing in space. The color sequential method employs three color light sources: red, green and blue to penetrate a same liquid crystal area with a specific gray level at a different time in order to display specific colors. This is known as color mixing in time.
Compared with the color filter method, the color sequential method does not have to use color filters, thereby costs are lower than those of the color filter method and light transmittance is increased. However, a higher data write rate is required for the color sequential method. Suppose that a frame time of a pixel T0 includes a writing time T1 and a response time T2, and the color filters method writes pixel data corresponding to each sub-pixel of a single pixel (sub-pixels of a single pixel correspond to color filters of red, green and blue) into each sub-pixel within the writing time T1; the writing rate is (1/T1). The color sequential method writes pixel data corresponding to color filters of red, green and blue sequentially; the writing rate is (3/T1). A higher writing rate may result in an insufficient charging time for liquid crystals in the pixels, thereby lowering the display quality. Furthermore, a higher writing rate also causes higher power consumption.
It is therefore one objective of the present invention to provide a method for driving a liquid crystal display (LCD) apparatus, wherein the LCD apparatus comprises a plurality of scan rows, a plurality of data columns, and a data driving circuit. The method comprises: driving a plurality of specific scan rows of the plurality of scan rows at the same time; extracting a plurality of pixel data arranged into a first order corresponding to the plurality of specific scan rows; arranging the plurality of pixel data into a second order different from the first order according to a connecting relationship between the data driving circuit and a plurality of pixels of the plurality of specific scan rows; and utilizing the data driving circuit to drive a plurality of pixels according to the plurality of pixel data corresponding to the second order.
It is another objective of the present invention to provide an LCD apparatus. The LCD apparatus comprises: a plurality of scan rows, a plurality of data columns, a scan driving circuit, a data driving circuit, and a data ordering circuit. The scan driving circuit is employed for driving a plurality of specific scan rows of the plurality of scan rows. The data driving circuit is employed for driving the plurality of data columns. The data arrangement circuit is employed for extracting a plurality of pixel data arranged into a first order corresponding to the plurality of specific scan rows, and arranging the plurality of pixel data into a second order different from the first order according to a connecting relationship between the data driving circuit and a plurality of pixels of the plurality of specific scan rows, wherein the data driving circuit is employed for driving a plurality of pixels according to the plurality of pixel data corresponding to the second order.
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.
For carrying out multiple scan driving, each output terminal of the data driving circuit 140 and each pixel on the LCD apparatus 100 has a specific connecting relationship. In this embodiment, the (4x+1)th output terminal of the data driving circuit 140 is electrically connected to a pixel of the (2z+1)th data column on the (2y+1)th scan row; the (4x+2)th output terminal of the data driving circuit 140 is electrically connected to the pixel of the (2z+1)th data column on the (2y+2)th scan row; the (4x+3)th output terminal of the data driving circuit 140 is electrically connected to the pixel of the (2z+2)th data column on the (2y+2)th scan row; and the (4x+4)th output terminal of the data driving circuit 140 is electrically connected to the pixels of the (2z+2)th data column on the (2y+1)th scan row (x, y, z are all natural numbers). Each pixel has a reversed polarity against each neighboring pixel in order to alleviate flicker.
Please note that
Step 210: Drive a plurality of specific scan rows of a plurality of scan rows at the same time;
Step 220: Extract a plurality of pixel data, arranged into a first order, corresponding to the plurality of specific scan rows;
Step 230: Arrange the plurality of pixel data into a second order different from the first order according to a connecting relationship between the data driving circuit and a plurality of pixels of the plurality of specific scan rows;
Step 240: Utilize the data driving circuit to drive a plurality of pixels according to the plurality of pixel data corresponding to the second order.
Please note that, provided that the result is substantially the same, the steps mentioned above are not limited to be executed according to the exact order shown in
Please refer to
One output terminal of the scan driving circuit 130′ shown in
Accordingly, the data arrangement circuit 110 is utilized for extracting a plurality of pixel data, arranged into the first order, corresponding to the plurality of specific scan rows in accordance with Step 220. In this embodiment, the 1st and the 2nd scan rows are driven by the scan driving circuit 130 at the same time so that the data arrangement circuit 110 needs to extract the plurality of pixel data corresponding to the 1st and the 2nd scan rows. These pixel data are obtained from video signals provided by a video system side (not shown in
Next, referring to Step 230, the data arrangement circuit 110 arranges a plurality of pixel data into a second order different from the first order according to the connecting relationship between the data driving circuit 140 and a plurality of pixels on the plurality of specific scan rows. In this embodiment, the data arrangement circuit 110 rearranges the plurality of pixel data arranged into the first order as a second order according to the connecting relationship between the data driving circuit 140 and the plurality of pixels on the 1st and the 2nd scan rows. For example, rearranging the parallel RGB signals makes the Red pixel data of the first data column on the first scan row, the Red pixel data of the first data column on the second scan row, and the Red pixel data of the second data column on the second scan row placed at the first priority and makes the Red pixel data of the second data column on the first scan row, the Red pixel data of the third data column on the first scan row, and the Red pixel data of the third data column on the second scan row placed at the second priority.
In accordance with Step 240, the data driving circuit 140 drives a plurality of pixels according to the plurality of pixel data arranged into the second order. For example, in this embodiment, the controller 120 sequentially inputs at least one pixel data of the plurality of pixel data corresponding to the second order to the data driving circuit 140. For instance, in the first clock cycle, a pixel data corresponding to a (6n+1)th data column on the (2m+1)th scan row, a pixel data corresponding to the (6n+1)th data column on the (2m+2)th scan row, and a pixel data corresponding to a (6n+2)th data column on the (2m+2)th scan row are respectively input to the data driving circuit 140 at the same time. In the second clock cycle, a pixel data corresponding to the (6n+2)th data column on the (2m+1)th scan row, a pixel data corresponding to the (6n+3)th data column on the (2m+1)th scan row, and a pixel data corresponding to a (6n+3)th data column on the (2m+2)th scan row are respectively input to the data driving circuit 140 at the same time. In the third clock cycle, a pixel data corresponding to a (6n+4)th data column on the (2m+2)th scan row, a pixel data corresponding to the (6n+4)th data column on the (2m+1)th scan row, and a pixel data corresponding to a (6n+5)th data column on the (2m+1)th scan row are respectively input to the data driving circuit 140 at the same time. Finally, in the fourth clock cycle, a pixel data corresponding to a (6n+5)th data column on the (2m+2)th scan row, a pixel data corresponding to a (6n+6)th data column on the (2m+2)th scan row, and a pixel data corresponding to the (6n+6)th data column on the (2m+1)th scan row are respectively input to the data driving circuit 140 at the same time, wherein m and n are both natural numbers. After all pixel data of the 1st and the 2nd scan rows are input to the data driving circuit 140, according to each pixel data, the data driving circuit 140 drives each corresponding pixel of the 1st and the 2nd scan rows.
For carrying out multiple scan driving, each output terminal of the data driving circuit 440 and each pixel on the LCD apparatus 400 has a specific connecting relationship. In this embodiment, a (2x+1)th output terminal of the data driving circuit 440 is electrically connected to a pixel of a (2z+1)th data column on the (2y+1)th scan row; and a (2x+2)th output terminal of the data driving circuit 440 is electrically connected to the pixel of the (2z+1)th data column on the (2y+2)th scan row (x, y, z are both natural numbers). Please note that
The scan driving circuit 430 comprises a plurality of output terminals, electrically connected to a plurality of specific scan rows of the plurality of scan rows, and the scan driving circuit 430 is utilizing for driving the plurality of specific scan rows at the same time. For instance, the scan driving circuit 430 drives the 1st and the 2nd scan rows at the time same; however, this is not a limitation.
In this embodiment, the 1st and the 2nd scan rows are driven by the scan driving circuit 430 at the same time so that the data arrangement circuit 410 needs to extract the plurality of pixel data corresponding to the 1st and the 2nd scan rows. These pixel data are obtained from video signals arranged into a first order provided by a video system side (not shown in FIG. 4). In this embodiment, the video system side outputs pixel data regarding three sub-pixels of red, green and blue of a single pixel at the same time within one clock cycle; namely, parallel RGB signals.
In this embodiment, the data arrangement circuit 410 rearranges the plurality of pixel data arranged into the first order as a second order according to the connecting relationship between the data driving circuit 440 and a plurality of pixels on the 1st and the 2nd scan rows. For example, rearranging the parallel RGB signals makes the Red pixel data of the first data column on the first scan row, the Red pixel data of the first data column on the second scan row, and the Red pixel data of the second data column on the first scan row placed at the first priority; and makes the Red pixel data of the second data column on the second scan row, the Red pixel data of the third data column on the first scan row, and the Red pixel data of the third data column on the second scan row placed at the second priority.
The data driving circuit 440 drives a plurality of pixels according to the plurality of pixel data arranged into the second order. For example, in this embodiment, the controller 420 sequentially inputs at lease one pixel data of the plurality of pixel data corresponding to the second order to the data driving circuit 440. For instance, in the first clock cycle, the pixel data corresponding to the (3n+1)th data column on the (2m+1)th scan row, the pixel data corresponding to the (3n+1)th data column of the (2m+2)th scan row, and the pixel data corresponding to the (3n+2)th data column on the (2m+1)th scan row are respectively input to the data driving circuit 440 at the same time. In the second clock cycle, the pixel data corresponding to the (3n+2)th data column on the (2m+2)th scan row, a pixel data corresponding to the (3n+3)th data column on the (2m+1)th scan row, and a pixel data corresponding to the (3n+3)th data column on the (2m+2)th scan row are respectively input to the data driving circuit 440 at the same time, wherein m and n are both natural numbers. After all pixel data of the 1st and the 2nd scan rows are input to the data driving circuit 440, according to each pixel data, the data driving circuit 440 drives each corresponding pixel of the 1st and the 2nd scan rows
To sum up, employing the method and the apparatus of the present invention rearranges the conventional video signals. Combined with the conventional data driving circuit, multiple scan driving can therefore be carried out. Hence, the present invention enables the conventional LCD apparatus to have low power consumption, a preferred display quality and reduced manufacturing costs by means of this multiple scan driving, without requiring huge modifications.
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.
Number | Date | Country | Kind |
---|---|---|---|
097127940 | Jul 2008 | TW | national |