Liquid crystal grating and fabrication method thereof, and naked eye 3D display device

1. A liquid crystal grating, comprising a first substrate and a second substrate provided opposite to each other and a liquid crystal layer provided between the first substrate and the second substrate, a plate-shaped transparent electrode being provided on the first substrate, wherein,

a second transparent conductive layer, a transparent insulating layer and a first transparent conductive layer are sequentially provided on the second substrate;

the first transparent conductive layer includes first strip-shaped transparent electrodes and second strip-shaped transparent electrodes which are alternately provided, and there is a gap between the first strip-shaped transparent electrode and the second strip-shaped transparent electrode adjacent to each other;

the second transparent conductive layer includes third strip-shaped transparent electrodes provided at intervals;

one second strip-shaped transparent electrode is provided between every two immediately adjacent first strip-shaped transparent electrodes, and one first strip-shaped transparent electrode is provided between every two immediately adjacent second strip-shaped transparent electrodes; and

only one third strip-shaped transparent electrode is provided between orthographic projections of every two immediately adjacent second strip-shaped transparent electrodes on the second transparent conductive layer, and only one second strip-shaped transparent electrode is provided between orthographic projections of every two immediately adjacent third strip-shaped transparent electrodes on the first transparent conductive layer.

2. The liquid crystal grating according to claim 1 , wherein, the third strip-shaped transparent electrode is provided at an edge of the first strip-shaped transparent electrode.

3. The liquid crystal grating according to claim 1 , wherein, a projection of the third strip-shaped transparent electrode on the second substrate overlaps with a projection of the first strip-shaped transparent electrode on the second substrate.

4. The liquid crystal grating according to claim 1 , wherein, a voltage of the second strip-shaped transparent electrode and a voltage of the third strip-shaped transparent electrode are same as a voltage of the plate-shaped transparent electrode and are different from a voltage of the first strip-shaped transparent electrode.

5. The liquid crystal grating according to claim 1 , wherein, a side of the third strip-shaped transparent electrode overlaps with a side of one of the first strip-shaped transparent electrodes, and the other side of the third strip-shaped transparent electrode at most extends to an edge of a next first strip-shaped transparent electrode next to the one of the first strip-shaped transparent electrodes.

6. The liquid crystal grating according to claim 5 , wherein, the other side of the third strip-shaped transparent electrode extends to a position between the one of the first strip-shaped transparent electrodes and the second strip-shaped transparent electrode adjacent to the one of the first strip-shaped transparent electrodes.

7. The liquid crystal grating according to claim 6 , wherein, the first strip-shaped transparent electrode has a width of 419.32 μm, and the second strip-shaped transparent electrode has a width of 84.83 μm.

8. The liquid crystal grating according to claim 7 , wherein, the third strip-shaped transparent electrode has a width of 3 μm, and an overlapping width between the third strip-shaped transparent electrode and the one of the first strip-shaped transparent electrodes is 1.15 μm.

9. The liquid crystal grating according to claim 1 , wherein, a side of the third strip-shaped transparent electrode is provided at an edge of one of the first strip-shaped transparent electrodes, and the other side of the third strip-shaped transparent electrode at most extends to an edge of a next first strip-shaped transparent electrode next to the one of the first strip-shaped transparent electrodes.

10. The liquid crystal grating according to claim 1 , wherein, there is a gap between a side of the third strip-shaped transparent electrode and an edge of one of the first strip-shaped transparent electrodes, and the other side of the third strip-shaped transparent electrode at most extends to an edge of a next first strip-shaped transparent electrode next to the one of the first strip-shaped transparent electrodes.

11. The liquid crystal grating according to claim 10 , wherein, the gap has a width less than 1 μm.

12. The liquid crystal grating according to claim 1 , wherein, a width of the first strip-shaped transparent electrode is greater than a width of the second strip-shaped transparent electrode and a width the third strip-shaped transparent electrode.

13. A display device, comprising the liquid crystal grating according to claim 1 .

14. A fabrication method of a liquid crystal grating, comprising:

forming a transparent conductive layer on a first substrate, and forming a pattern including a plate-shaped transparent electrode by a patterning process;

forming a second transparent conductive layer on a second substrate, and forming a pattern including third strip-shaped transparent electrodes provided at intervals by a patterning process;

forming a transparent insulating layer on the second substrate where the second transparent conductive layer has been formed;

forming a first transparent conductive layer on the second substrate where the transparent insulating layer has been formed, forming a pattern including first strip-shaped transparent electrodes and second strip-shaped transparent electrodes by a patterning process, the first strip-shaped transparent electrodes and the second strip-shaped transparent electrodes being alternately provided, and there being a gap between the first strip-shaped transparent electrode and the second strip-shaped transparent electrode adjacent to each other; and

dripping off liquid crystal molecules on the first substrate or the second substrate, and bonding the first substrate and the second substrate to form the liquid crystal grating;

wherein one second strip-shaped transparent electrode is provided between every two immediately adjacent first strip-shaped transparent electrodes, and one first strip-shaped transparent electrode is provided between every two immediately adjacent second strip-shaped transparent electrodes; and

only one third strip-shaped transparent electrode is provided between orthographic projections of every two immediately adjacent second strip-shaped transparent electrodes on the second transparent conductive layer, and only one second strip-shaped transparent electrode is provided between orthographic projections of every two immediately adjacent third strip-shaped transparent electrodes on the first transparent conductive layer.

15. The fabrication method of the liquid crystal grating according to claim 14 , wherein, a voltage of the second strip-shaped transparent electrode and a voltage of the third strip-shaped transparent electrode are same as a voltage of the plate-shaped transparent electrode and are different from a voltage of the first strip-shaped transparent electrode.

16. The liquid crystal grating according to claim 1 , wherein an edge of an orthographic projection of each third strip-shaped transparent electrode on the first transparent conductive layer is in direct contact with an edge of adjacent second strip-shaped transparent electrode in a direction along which the first strip-shaped transparent electrodes and the second strip-shaped transparent electrodes are alternately arranged.

17. A driving method for a liquid crystal grating comprising a first substrate and a second substrate provided opposite to each other and a liquid crystal layer provided between the first substrate and the second substrate, a plate-shaped transparent electrode being provided on the first substrate,

wherein a second transparent conductive layer, a transparent insulating layer and a first transparent conductive layer are sequentially provided on the second substrate,

the first transparent conductive layer includes first strip-shaped transparent electrodes and second strip-shaped transparent electrodes which are alternately provided, and there is a gap between the first strip-shaped transparent electrode and the second strip-shaped transparent electrode adjacent to each other, and

the second transparent conductive layer includes third strip-shaped transparent electrodes provided at intervals,

the driving method comprising:

applying a first voltage to the second strip-shaped transparent electrodes, the third strip-shaped transparent electrodes and the plate-shaped transparent electrode;

applying a second voltage to the first strip-shaped transparent electrodes, wherein the first voltage are not equal to the second voltage one second strip-shaped transparent electrode is provided between every two immediately adjacent first strip-shaped transparent electrodes, and one first strip-shaped transparent electrode is provided between every two immediately adjacent second strip-shaped transparent electrodes; and only one third strip-shaped transparent electrode is provided between orthographic projections of every two immediately adjacent second strip-shaped transparent electrodes on the second transparent conductive layer, and only one second strip-shaped transparent electrode is provided between orthographic projections of every two immediately adjacent third strip-shaped transparent electrodes on the first transparent conductive layer.