The present invention relates to a liquid crystal display (LCD) and a driving method, more particularly, to a three-dimension (3D) LCD and a driving method.
There are some advantages for a LCD, such as lightness, slimness, low energy consuming, which are widely used in modern information devices, like computer, mobile phone and personal digital assistant. A conventional LCD are assembled by a LCD panel and a backlight module. The LCD panel mainly comprises an array substrate, a color filter substrate and a liquid crystal layer sandwiched between the two substrates. The array substrate comprises pixel area formed by pixel arrays.
There is a major trend for a 3D LCD capable of displaying 3D image because people have more and more demands for image display. The principle of 3D LCD shutter glasses is to use the concept of alternate-frame sequencing. The LCD alternates a left-eye frame and a right-eye frame in every 1/60 second and controls a switch of shutters in the glasses. The glasses blocks light for appropriate eye when the converse eye's image is displayed on the LCD, so that the left eye sees the left-eye frame and the right eye sees the right-eye frame. In the end, it synthesizes a 3D image in brain due to persistence and parallax of vision.
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As the one skilled in the art is aware, a crosstalk function is used to evaluate the display quality of the 3D display, and is defined as follow:
crosstalk=[L(WB)−L(BB)]/[L(BW)−L(BB)] (1)
where L(WB) represents a lightness of the displaying image when the left-eye frame is white and the right-eye frame is black, L(BB) represents a measured lightness of the displaying image when the left-eye frame and the right-eye frame are black, and L(BW) represents a lightness of the displaying image when the left-eye frame is black and the right-eye frame is white, all the parameters are obtained by measuring the lightness of the display through right glass. The less crosstalk indicates that it is not visible to the left-eye frame for the right eye by means of the right glass, and results in a better 3D display quality.
In hence, it is necessary to develop a 3D display having less crosstalk to upgrade 3D display quality.
The object of the present invention is to provide a 3D LCD and a driving method for effectively decreasing crosstalk to improve the 3D display quality of the 3D LCD.
According to the present invention, a method of driving a 3D LCD is provided. The 3D LCD comprises N data lines and 2M scan lines. The method comprises: sequentially turning on two adjacent scan lines of 2M scan lines once a time in a first scanning period while outputting data correspondent to a first frame to the N data lines; and sequentially turning on even number of the 2M scanning lines in a second scanning period while outputting data of a second frame to the N data lines. The first frame is viewed by user's one eye, and the second frame is viewed by user's the other eye.
In one aspect of the present invention, the first scanning period is equal to the second scanning period.
In another aspect of the present invention, the first scanning period is 1/240 second.
In another aspect of the present invention, the second scanning period is 1/240 second.
In another aspect of the present invention, the second scanning period is adjacent to the first scanning period.
According to the present invention, a 3D LCD comprises: N data lines and 2M scan lines; a gate driving module for sequentially turning on two adjacent scan lines of 2M scan lines once a time in a first scanning period and sequentially turning even number of the 2M scanning lines on in order in a second scanning period; and a source driving module coupled to the N data lines for outputting data of a first frame in the first scanning period and data of a second frame to the N data lines in the second scanning period. The first frame is viewed by user's one eye, and the second frame is viewed by user's the other eye.
In one aspect of the present invention, the first scanning period is equal to the second scanning period.
In another aspect of the present invention, the first scanning period is 1/240 second.
In another aspect of the present invention, the second scanning period is 1/240 second.
In another aspect of the present invention, the second scanning period is adjacent to the first scanning period.
The advantage of the present invention is that the 3D display is capable of decreasing crosstalk to improve 3D image display quality. It takes only half time for scanning a whole image because the present invention scans two scan lines once a time. In hence, the present invention just spends 1/240 second scanning an image when it drives at 120 Hz frame rate.
These and other features, aspects and advantages of the present disclosure will become understood with reference to the following description, appended claims and accompanying figures.
For better understanding embodiments of the present invention, the following detailed description taken in conjunction with the accompanying drawings is provided. Apparently, the accompanying drawings are merely for some of the embodiments of the present invention. Any ordinarily skilled person in the technical field of the present invention could still obtain other accompanying drawings without use laborious invention based on the present accompanying drawings.
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On the other hand, brightness of the upper part (the region 510) and the lower part (the region 530) is not quite different from each other in a black image because the transmittance of the upper part and the lower part of the LCD panel 200 is low as it turns the backlight of the upper part on. On the contrary, brightness of the upper part (the region 510) and the lower part (the region 530) is not quite different from each other because the transmittance of the upper part and the lower part of the LCD panel 200 is low as it turns the backlight of the lower part on.
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That is the character the present invention uses to decrease crosstalk of a LCD panel.
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As the 3D LCD 800 has to mutually display left-eye frames and right-eye frames, it displays one of the images (like the left-eye frame) in the first scanning period T1 and displays the other (like the right-eye frame) in the second scanning period T2.
The operation in the present invention is:
The gate driving module 810 scans two adjacent scan lines of the LCD panel 830 once a time in the first scanning period T1 while the data driving module 820 is outputting the data correspondent to one image (such as the mentioned left-eye frame) to the data lines D1˜DN. The driving method of the gate driving module 810 in the embodiment demonstrates in
And then, the gate driving module 810 scans the even number of the scan lines (G2, G4, G6 . . . G2M) of the LCD panel 830 once a time in the second scanning period T2 while the data driving module 820 is outputting the data correspondent to one image (such as the mentioned right-eye frame) to the data lines D1˜DN. The driving method of the gate driving module 810 in the embodiment demonstrates in
It is noted that the 3D LCD 800 just spends half of the time on scanning because the 3D LCD 800 scans two scan lines a time or half of the all scan lines. The driving method for the 3D LCD 800 that spends 1/240 second on scanning the first frame (the left-eye frame) or the second frame (the right-eye frame) in the embodiment is similar to that for the mentioned 240 Hz panel. Therefore, the transmittances of areas in the LCD panel 830 are more convergent, and the crosstalk of the LCD panel 830 is less than that of a LCD panel using 120 Hz frame rate, such that the uniformity of the LCD panel 830 is better than that of LCD panel using 120 Hz frame rate.
It is not limited by the order in the present invention that the LCD 800 outputs the left-eye frame first and then the right-eye frame. In practical, the LCD 800 outputting the right-eye frame first and then the left-eye frame is also in the scope of the present invention.
Compared with the prior art, the LCD 800 of the present invention has less crosstalk and better uniformity to upgrade 3D image quality.
Although the present invention has been explained by the embodiments shown in the drawings described above, it should be understood to the ordinary skilled person in the art that the invention is not limited to the embodiments, but rather various changes or modifications thereof are possible without departing from the spirit of the invention. Accordingly, the scope of the invention shall be determined only by the appended claims and their equivalents.
Number | Date | Country | Kind |
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201210275118.6 | Aug 2012 | CN | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/CN12/79984 | 8/10/2012 | WO | 00 | 10/1/2012 |