Transflective blue-phase liquid crystal display panel and liquid crystal display device

• US 9,500,903 B2
• Filed: 12/09/2013
• Issued: 11/22/2016
• Est. Priority Date: 12/10/2012
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Xie, Chang
• Primary Examiner(s): Nguyen, Dung
• Application Number:
  US14/100,473
• Publication Number:
  US 20140160403A1
• Time in Patent Office: 1,079 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134381 Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates
• CPC Class Codes: G02F 1/13793 Blue phases

Abstract

The present invention provides a transflective blue-phase liquid crystal display panel comprising a first substrate, a second substrate, and a liquid crystal layer, wherein the first substrate and the second substrate comprise a plurality of subpixels, and each subpixel comprises a reflective region and a transmissive region, the liquid crystal cell gap of the reflective region is equal to that of the transmissive region, a plurality of first common electrodes and first pixel electrodes that are alternately arranged at equal intervals are set on the part of the second substrate; a second common electrode is set on the part of the first substrate, a second pixel electrode having a via hole at its center is set on the part of the second substrate. In the invention, an alignment layer can be omitted; the display visual angle can be enlarged by designing an electrode structure, and the contrast ratio can be improved, thereby a single cell-gap structure can be attained.

Claims

1. A transflective blue-phase liquid crystal display panel, comprising a first substrate, a second substrate that is set opposite to the first substrate, and a liquid crystal layer that is set between the first substrate and the second substrate, wherein the first substrate and the second substrate comprise a plurality of subpixels, and each of the subpixels comprises a reflective region and a transmissive region, wherein:

the liquid crystal layer is a blue-phase liquid crystal layer;

the liquid crystal cell gap of the reflective region is equal to that of the transmissive region;

a plurality of first common electrodes and first pixel electrodes, that are alternately arranged at equal intervals, are set on the part of the second substrate corresponding to the transmissive region; and

a second common electrode, that is set corresponding to the whole reflective region, is set on the part of the first substrate corresponding to the reflective region, a second pixel electrode, that is set corresponding to the reflective region, is set on the part of the second substrate corresponding to the reflective region, and a via hole is formed at the center of the second pixel electrode;

wherein the via hole is a circular via hole, and a diameter of the via hole is greater than a minimum width of region between the via hole and an edge of the second pixel electrode.

2. The transflective blue-phase liquid crystal display panel of claim 1, wherein:

the first substrate comprises;

a first base substrate; and

the second common electrode, which is formed on one side of the first base substrate that is adjacent to the second substrate, and set corresponding to the whole reflective region.

3. The transflective blue-phase liquid crystal display panel according to claim 2, wherein:

the first substrate is a color filter substrate; and

the second substrate is an array substrate.

4. The transflective blue-phase liquid crystal display panel of claim 1, wherein:

the second substrate comprises;

a second base substrate;

a reflecting layer, which is formed on one side of the second base substrate that is adjacent to the first substrate, and set corresponding to the whole reflective region;

an insulating layer, which is formed on one side of the second base substrate that is adjacent to the first substrate and lies on the reflecting layer, and which is set corresponding to the whole reflective region and the whole transmissive region;

said plurality of first pixel electrodes and first common electrodes, which are formed on one side of the insulating layer that is adjacent to the first substrate, and set corresponding to the transmissive region; and

the second pixel electrode, which is formed on one side of the insulating layer that is adjacent to the first substrate, and set corresponding to the reflective region.

5. The transflective blue-phase liquid crystal display panel according to claim 4, wherein:

the first substrate is a color filter substrate; and

the second substrate is an array substrate.

6. The transflective blue-phase liquid crystal display panel of claim 1, wherein:

the width of the first pixel electrode is equal to that of the first common electrode.

7. The transflective blue-phase liquid crystal display panel according to claim 6, wherein:

the first substrate is a color filter substrate; and

the second substrate is an array substrate.

8. The transflective blue-phase liquid crystal display panel of claim 1, wherein:

the liquid crystal cell gap is in the range from 3 μ

m to 6 μ

m;

the width of the first pixel electrode and the first common electrode is in the range from 1 μ

m to 3 μ

m;

the interval between the first pixel electrode and the first common electrode is in the range from 4 μ

m to 8 μ

m;

the diameter of the via hole is in the range from 10 μ

m to 25 μ

m; and

the minimum width of the region formed between the via hole and the edge of the second pixel electrode is in the range from 2 μ

m to 6 μ

m.

9. The transflective blue-phase liquid crystal display panel of claim 8, wherein:

the liquid crystal cell gap is 4.4 μ

m;

the width of the first pixel electrode and the first common electrode is 2 μ

m;

the interval between the first pixel electrode and the first common electrode is 6 μ

m;

the diameter of the via hole is 18 μ

m; and

the minimum width of the region formed between the via hole and the edge of the second pixel electrode is 4 μ

m.

10. The transflective blue-phase liquid crystal display panel according to claim 9, wherein:

the first substrate is a color filter substrate; and

the second substrate is an array substrate.

11. The transflective blue-phase liquid crystal display panel according to claim 8, wherein:

the first substrate is a color filter substrate; and

the second substrate is an array substrate.

12. The transflective blue-phase liquid crystal display panel of claim 1, wherein:

the voltage applied to the first common electrode is equal to that applied to the second common electrode.

13. The transflective blue-phase liquid crystal display panel of claim 1, wherein:

the voltage applied to the first pixel electrode is equal to that applied to the second pixel electrode.

14. The transflective blue-phase liquid crystal display panel according to claim 1, wherein:

the first substrate is a color filter substrate; and

the second substrate is an array substrate.

15. The transflective blue-phase liquid crystal display panel according to claim 1, wherein:

the first substrate is a color filter substrate; and

the second substrate is an array substrate.

16. A liquid crystal display device, wherein:

the liquid crystal display device comprises the liquid crystal display panel of claim 1.

17. The liquid crystal display device of claim 16, further comprising:

a first polarizer, which is formed on one side of the first base substrate that is far from the second substrate, and set corresponding to the reflective region and the transmissive region; and

a second polarizer, which is formed on one side of the second base substrate that is far from the first substrate, and set corresponding to the reflective region and the transmissive region.

18. The transflective blue-phase liquid crystal display panel of claim 1, wherein a projection of a part of the second pixel electrode excepting the via hole onto the second substrate covers a part of the reflective region excepting a projection of the via hole onto the reflective region.

19. The transflective blue-phase liquid crystal display panel of claim 1, wherein the second common electrode spans across the via hole, and the projection of the second common electrode onto the second substrate covers both the second pixel electrode and the via hole.