CROSS REFERENCE

This application is a US National Stage of International Application No. PCT/CN2018/111964, filed on Oct. 25, 2018, designating the United States and claiming the priority of Chinese Patent Application No. 201810210885.6, filed with the Chinese Patent Office on Mar. 14, 2018, and entitled “A display panel, a method for driving the same, and a display device”. The entire disclosure of each of the applications above is incorporated herein by reference.

FIELD

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

BACKGROUND

Liquid crystal displays (hereinafter “LCDs”) has become predominant in the field of flat-panel displays. In an LCD, liquid crystal molecules between two sheets of electrically-conductive glass are driven to deflect by an electric field formed therebetween to display an image. However, the liquid crystal molecules may not resume their original state after they have deflected to a certain angle for a long time, resulting in an after-image which hinders the image from being displayed normally.

SUMMARY

An embodiment of this disclosure provides a display panel. The display panel includes a first substrate and a second substrate arranged opposite each other, and a plurality of pixel elements located between the first substrate and the second substrate, where each of the plurality of pixel elements includes a photonic crystal light-modulating structure.

In the display panel according to some implementation modes of the embodiment of this disclosure, each of the plurality of pixel elements further includes a plurality of sub-pixels in different colors. The photonic crystal light-modulating structure includes a first electrode layer, a second electrode layer, and a photonic crystal film between the first electrode layer and the second electrode layer. Material of the photonic crystal film includes piezoelectric material. And at least one of the first electrode layer and the second electrode layer includes a plurality of sub-electrodes, where the plurality of sub-electrodes are independent of each other and are arranged corresponding to the plurality of sub-pixels in a one-to-one manner.

In the display panel according to some implementation modes of the embodiment of this disclosure, the photonic crystal film includes a plurality of photonic crystal resonant cavities corresponding to the plurality of sub-pixels in a one-to-one manner.

In the display panel according to some implementation modes of the embodiment of this disclosure, each of the plurality of pixel elements includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The plurality of photonic crystal resonant cavities include a red photonic crystal resonant cavity corresponding to the red sub-pixel, a green photonic crystal resonant cavity corresponding to the green sub-pixel, and a blue photonic crystal resonant cavity corresponding to the blue sub-pixel.

In the display panel according to some implementation modes of the embodiment of this disclosure, the piezoelectric material includes barium titanate, lead zirconate titanate, lead metaniobate, or lead barium solium lithium niobate.

In the display panel according to some implementation modes of the embodiment of this disclosure, each of the plurality of sub-pixels includes a corresponding color filter sheet located between the first substrate and the second substrate.

In the display panel according to some implementation modes of the embodiment of this disclosure, for each of the plurality of photonic crystal resonant cavities, a length of the photonic crystal resonant cavity is an integer multiple of a wavelength of light emitted from its corresponding sub-pixel.

In the display panel according to some implementation modes of the embodiment of this disclosure, for each of the plurality of photonic crystal resonant cavities, a length of the photonic crystal resonant cavity is an odd multiple of a half of a wavelength of light emitted from its corresponding sub-pixel.

In the display panel according to some implementation modes of the embodiment of this disclosure, the photonic crystal light-modulating structure is configured so that lengths of the plurality of photonic crystal resonant cavities are adjusted according to a difference in voltage between the first electrode layer and the second electrode layer.

In the display panel according to some implementation modes of the embodiment of this disclosure, the photonic crystal resonant cavities are annular photonic crystal resonant cavities.

According to some implementation modes of the embodiment of this disclosure, the display panel further includes a backlight source located on a side of the first or second substrate away from the pixel elements.

In the display panel according to some implementation modes of the embodiment of this disclosure, when the first electrode layer includes a plurality of sub-electrodes independent of each other and corresponding to the plurality of sub-pixels in a one-to-one manner, the second electrode layer is a planar electrode.

In the display panel according to some implementation modes of the embodiment of this disclosure, when the second electrode layer includes a plurality of sub-electrodes independent of each other and corresponding to the plurality of sub-pixels in a one-to-one manner, the first electrode layer is a planar electrode.

The embodiment of the disclosure further provides a display device. The display device includes the display panel according to the embodiment of this disclosure.

The embodiment of the disclosure further provides a method for driving the display panel. The method includes: determining intensities of light emitted from the plurality of pixel elements; and controlling the photonic crystal light-modulating structures so that the plurality of pixel elements emit the light at the determined intensities.

In the driving method according to some implementation modes of the embodiment of this disclosure, each of the plurality of pixel elements further includes a plurality of sub-pixels in different colors; the photonic crystal light-modulating structure includes a first electrode layer, a second electrode layer, and a photonic crystal film between the first electrode layer and the second electrode layer; material of the photonic crystal film includes piezoelectric material; at least one of the first electrode layer and the second electrode layer includes a plurality of sub-electrodes corresponding to the plurality of sub-pixels and arranged independent of each other; the photonic crystal film includes a plurality of photonic crystal resonant cavities corresponding to the plurality of sub-pixels in a one-to-one manner. Controlling the photonic crystal light-modulating structures so that the plurality of pixel elements emit light at the determined intensities includes: for each of the photonic crystal light-modulating structures: determining correspondence relationships between lengths of the plurality of photonic crystal resonant cavities included by the photonic crystal light-modulating structure and intensities of light emitted from the pixel element including the photonic crystal light-modulating structure; determining a difference in voltage between the first electrode layer and the second electrode layer included by the photonic crystal light-modulating structure according to the correspondence relationships; and applying a first voltage to the first electrode layer corresponding to the pixel element, and a second voltage to the second electrode layer corresponding to the pixel element, according to the difference in voltage between the first electrode layer and the second electrode layer, so that the pixel element emits light at the determined intensities.

