CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a U.S. national Stage of International Application No. PCT/CN2017/115783, filed on Dec. 13, 2017, designating the United States, which claims priority to Chinese Patent Application No. 201710839663.6, filed with the Chinese Patent Office on Sep. 18, 2017 and entitled “DRIVING METHOD FOR DISPLAY DEVICE AND DISPLAY DEVICE”, the content of each of which is hereby incorporated by reference in its entirety.

FIELD

This disclosure relates to the field of display technologies, and more particularly relates to a driving method for a display device and a display device.

BACKGROUND

Conventional large-size liquid crystal displays use negative vertical alignment (VA) liquid crystal or in-plane switching (IPS) liquid crystal technology. In the case of a large viewing angle, brightness of a pixel of the VA liquid crystal display is rapidly saturated along with the driving voltage, which causes severe color shift of the liquid crystal display under a large viewing angle, thereby affecting image display quality of the liquid crystal display.

When original driving signals for driving a sub-pixel in a liquid crystal display panel include a high voltage signal and a low voltage signal to drive the sub-pixel in the liquid crystal display panel, the problem of color shift of the liquid crystal display in the case of a large viewing angle can be improved. One solution to the problem of color shift of a liquid crystal display under a large viewing angle is to divide each sub-pixel in the liquid crystal display panel into primary and secondary pixels; by providing different driving voltages to the primary and secondary pixels in each sub-pixel, liquid crystal molecules corresponding to the primary and secondary pixels in each sub-pixel have different deflection directions, thereby enhancing optical isotropy of the liquid crystal molecules, and thus solving the problem of color shift of the liquid crystal display panel under a large viewing angle. However, providing different driving voltages for the primary and secondary pixels in each sub-pixel requires that some metal wires and thin film transistor elements respectively drive the primary and secondary pixels for display, but these metal wires and the thin film transistor elements may affect illumination of the liquid crystal display panel, so that a light transmission opening area of the liquid crystal display panel is greatly reduced, affecting transmittance of the liquid crystal display panel, and causing increase of backlight costs of the liquid crystal display panel.

SUMMARY

In view of this, embodiments of this disclosure provide a driving method for a display device and a display device. By displaying a same pre-display image in m continuous frames of display cycles, and setting that in a same frame of display cycle, grayscale values of two blue sub-pixels in a pixel group are a first target grayscale value and a second target grayscale value in a set of target grayscale value pair, the first target grayscale value of each set of target grayscale value pair is greater than a preset grayscale value of a corresponding blue sub-pixel, and the second target grayscale value is smaller than a preset grayscale value of a corresponding blue sub-pixel, the problem of color shift of a liquid crystal display panel under a large viewing angle is alleviated, and the problem that the metal wires and thin film transistor elements affect transmittance of the display panel in the prior art is resolved. It is also set that in at least two frames of display cycles, target grayscale value pairs corresponding to pixel groups in a same position on the display panel are different, while the target grayscale values corresponding to the pixel groups in the same position on the display panel in each frame of display cycle are the same, so that the gamma curve corresponding to a blue sub-pixel can approximate to the front-viewing-angle gamma curve to the greatest extent whether it corresponds to a high grayscale region or a low grayscale region, thereby further alleviating the problem of color shift of the liquid crystal display panel under the large viewing angle.

An embodiment of this disclosure provides a driving method for a display device, including:

obtaining a pre-display image, where each sub-pixel in the pre-display image corresponds to a preset grayscale value;

obtaining, according to an average of preset grayscale values corresponding to two blue sub-pixels in each pixel group, n sets of target grayscale value pairs corresponding to the pixel group by table lookup, a display panel including a plurality of pixel groups, and the pixel group including the two blue sub-pixels, where each set of the target grayscale value pair includes a first target grayscale value and a second target grayscale value, grayscale value differences of the n set of target grayscale value pairs are different, and the grayscale value difference is equal to the first target grayscale value minus the second target grayscale value of a same set of target grayscale value pair; and

displaying a same pre-display image in m continuous frames of display cycles, where in a same frame of display cycle, grayscale values of the two blue sub-pixels in the pixel group are the first target grayscale value and the second target grayscale value in a set of target grayscale value pair, the first target grayscale value of each set of target grayscale value pair is greater than a preset grayscale value of a corresponding blue sub-pixel, the second target grayscale value is smaller than a preset grayscale value of a corresponding blue sub-pixel, and in at least two frames of display cycles, target grayscale value pairs corresponding to pixel groups in a same position on the display panel are different, and

m is an integer greater than 1, and n is an integer greater than 1 and less than or equal to m.

An embodiment of this disclosure provides a display device, including:

an image obtaining module, configured to obtain a pre-display image, where each sub-pixel in the pre-display image corresponds to a preset grayscale value;

a lookup module, electrically connected to the image obtaining module, and configured to obtain, according to an average of preset grayscale values corresponding to the two blue sub-pixels in the pixel group, n sets of target grayscale value pairs corresponding to the pixel group by table lookup;

a first control module, electrically connected to the lookup module, where each set of the target grayscale value pair includes a first target grayscale value and a second target grayscale value, the first control module is configured to control grayscale value differences of the n sets of target grayscale value pairs to be different, and the grayscale value difference is equal to the first target grayscale value minus the second target grayscale value of a same set of target grayscale value pair;

a drive module, electrically connected to the first control module and the display panel, and configured to drive a display panel to display a same pre-display image in m continuous frames of display cycles;

a second control module, electrically connected to the lookup module and the drive module, where in a same frame of display cycle, the grayscale values of the two blue sub-pixels in the pixel group are the first target grayscale value and the second target grayscale value in a set of target grayscale value pair, the second control module is configured to control the first target grayscale value of each set of target grayscale value pair to be greater than a preset grayscale value of a corresponding blue sub-pixel and the second target grayscale value to be smaller than a preset grayscale value of a corresponding blue sub-pixel, and in at least two frames of display cycles, and target grayscale value pairs corresponding to pixel groups in a same position on the display panel are different, where m is an integer greater than 1, and n is an integer greater than 1 and less than or equal to m; and

a display panel, including a plurality of pixel groups, and each of the pixel groups including the two blue sub-pixels.

An embodiment of this disclosure further provides a driving method for a display device, including:

obtaining a pre-display image, where each sub-pixel in the pre-display image corresponds to a preset grayscale value;

obtaining, according to an average of preset grayscale values corresponding to two blue sub-pixels in each pixel group, n sets of target grayscale value pairs corresponding to the pixel group by table lookup, a display panel including a plurality of pixel groups, and the pixel group including the two blue sub-pixels, where each set of the target grayscale value pairs includes a first target grayscale value and a second target grayscale value, grayscale value differences of the n sets of target grayscale value pairs are different, and the grayscale value difference is equal to the first target grayscale value minus the second target grayscale value of a same set of target grayscale value pair;

displaying a same pre-display image in m continuous frames of display cycles;

where in a same frame of display cycle, grayscale values of the two blue sub-pixels in the pixel group are the first target grayscale value and the second target grayscale value in a set of target grayscale value pair; the first target grayscale value of each set of target grayscale value pair is greater than a preset grayscale value of a corresponding blue sub-pixel, the second target grayscale value is smaller than a preset grayscale value of a corresponding blue sub-pixel, and in at least two frames of display cycles, target grayscale value pairs corresponding to pixel groups in a same position on the display panel are different; and

in one of two neighboring frames of display cycles, a grayscale value of a blue sub-pixel on the display panel is greater than a preset grayscale value corresponding to the blue sub-pixel, in one of the two neighboring frames of display cycles, a grayscale value of a blue sub-pixel in a same position on the display panel is smaller than a preset grayscale value corresponding to the blue sub-pixel, and in the m frames of display cycles, an average of a first target grayscale value and a second target grayscale value of blue sub-pixels in a same position on the display panel is equal to preset grayscale values corresponding to the blue sub-pixels, where m is an even number greater than 2, and n is an integer greater than 1 and less than or equal to m.

