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

• US 10,324,338 B2
• Filed: 07/16/2015
• Issued: 06/18/2019
• Est. Priority Date: 12/16/2014
• Status: Active Grant

• Current Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: Chen, Yuqiong
• Primary Examiner(s): Nguyen, Lauren
• Application Number:
  US14/908,298
• Publication Number:
  US 20160342039A1
• Time in Patent Office: 1,433 Days
• CPC Class Codes: G02B 26/02 for controlling the intensity of light G02B26/004 takes precedence
• CPC Class Codes: G02B 30/27 involving lenticular arrays
• CPC Class Codes: G02B 30/31 involving active parallax barriers involving directional light or back-light sources G02B30/33
• CPC Class Codes: G02F 1/0316 Electrodes
• CPC Class Codes: G02F 1/0322 Arrangements comprising two or more independently controlled crystals
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/1341 Filling or closing of cells
• CPC Class Codes: G02F 1/13415 Drop filling process
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/155 Electrodes
• CPC Class Codes: G02F 2201/128 field shaping
• CPC Class Codes: G02F 2201/15 periodic

Abstract

A liquid crystal grating and a fabrication method thereof, and a display device are provided. The liquid crystal grating comprises a first substrate (1) and a second substrate (2) provided opposite to each other, and a liquid crystal layer (7); a plate-shaped transparent substrate (3) is provided on the first substrate (1), and a second transparent conductive layer (4), a transparent insulating layer (5) and a first transparent conductive layer (6) are sequentially provided on the second substrate (2); the first transparent conductive layer (6) includes first strip-shaped transparent electrodes (61) and second strip-shaped transparent electrodes (62) which are alternately provided, and there is a gap between the first strip-shaped transparent electrode (61) and the second strip-shaped transparent electrode (62) adjacent to each other; and the second transparent conductive layer (4) includes third strip-shaped transparent electrodes (41) provided at intervals.

Claims

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 μ

m, and the second strip-shaped transparent electrode has a width of 84.83 μ

m.

8. The liquid crystal grating according to claim 7, wherein, the third strip-shaped transparent electrode has a width of 3 μ

m, and an overlapping width between the third strip-shaped transparent electrode and the one of the first strip-shaped transparent electrodes is 1.15 μ

m.

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 μ

m.

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.

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.

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.

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.