Light controlling apparatus and method of fabricating the same

Patent metadata

Field	Value
Publication number	US-9804467-B2
Application number	US-201514837090-A
Country	US
Kind code	B2
Filing date	Aug 27, 2015
Priority date	Dec 2, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

Provided are a light controlling apparatus and a method of fabricating the same. The light controlling apparatus comprises: a first electrode unit and a second electrode unit facing each other; a liquid crystal unit between the first electrode unit and the second electrode unit, the liquid crystal unit including: a liquid crystal; a network having a first polymer polymerized from a first monomer having a similar shape as the liquid crystal and a second polymer polymerized from a second monomer having a shape different from the first monomer; and a wall having the first polymer and the second polymer.

First claim

What is claimed is:

1. A light controlling apparatus comprising:
a first electrode unit and a second electrode unit facing each other, the first electrode unit comprising a first substrate, the second electrode unit comprising a second substrate, and at least one of the electrode units comprising at least one electrode;
a liquid crystal unit between the first electrode unit and the second electrode unit and the liquid crystal unit including:
a liquid crystal;

a network, mixed together with the liquid crystal, having a first polymer polymerized from a first monomer having a similar shape as the liquid crystal to assist in vertical alignment of the liquid crystal when an electric field is not applied and a second polymer polymerized from a second monomer having a shape different from the first monomer to assist in random alignment of the liquid crystal when an electric field is applied; and
a wall, configured in a mesh structure to correspond with boundaries related to a plurality of pixels P at a display device, formed from the first polymer and the second polymer,

wherein the light controlling apparatus operates in a transparent mode with the liquid crystal in a homeotropic state and operates in a light shielding mode with the liquid crystal in a random state.

2. The light controlling apparatus according to claim 1 , further comprising a spacer on at least one among the first electrode unit and the second electrode unit.

3. The light controlling apparatus according to claim 1 , wherein the first monomer and the second monomer are UV-hardened monomers.

4. The light controlling apparatus according to claim 3 , wherein UV wavelengths of the UV-hardened monomers include same wavelength range.

5. The light controlling apparatus according to claim 1 , wherein the first monomer includes a RM (reactive mesogen)-based monomer.

6. The light controlling apparatus according to claim 1 , wherein the second monomer includes a Bisphenol A Dimethacrylate-based monomer.

7. The light controlling apparatus according to claim 1 , wherein if the liquid crystal is one among a negative type liquid crystal or a DFLC (dual frequency liquid crystal), each of the first electrode unit and the second electrode unit includes a common electrode.

8. The light controlling apparatus according to claim 7 , wherein if the liquid crystal is the negative type liquid crystal, each of the first electrode unit and the second electrode unit is configured to apply a vertical electric field to the liquid crystal unit.

9. The light controlling apparatus according to claim 8 , wherein the light controlling apparatus exhibits the transparent mode with the liquid crystal in the homeotropic state when a voltage is not applied, and wherein the light controlling apparatus exhibits the light shielding mode with the liquid crystal in the random state when a voltage is applied.

10. The light controlling apparatus according to claim 1 , wherein if the liquid crystal includes one among a positive type liquid crystal or a DFLC (dual frequency liquid crystal), at least one among the first electrode unit and the second electrode unit includes a plurality of patterned electrodes.

11. The light controlling apparatus according to claim 10 , wherein a horizontal electric field is applied to the patterned electrodes.

12. The light controlling apparatus according to claim 11 , wherein the light controlling apparatus exhibits the transparent mode with the liquid crystal in the homeotropic state when a voltage is not applied, and wherein the light controlling apparatus exhibits the light shielding mode with the liquid crystal in the random state when a voltage is applied.

13. The light controlling apparatus according to claim 1 , wherein if the liquid crystal includes one among a positive type liquid crystal or a DFLC, at least one among the first electrode unit and the second electrode unit includes a plurality of patterned electrodes and a common electrode.

14. The light controlling apparatus according to claim 13 , wherein a horizontal electric field is applied to the patterned electrode and the common electrode.

15. The light controlling apparatus according to claim 14 , wherein the light controlling apparatus exhibits the transparent mode with the liquid crystal in the homeotropic state when a voltage is not applied, and wherein the light controlling apparatus exhibits the light shielding mode with the liquid crystal in the random state when a voltage is applied.

16. The light controlling apparatus according to claim 1 , further comprising an alignment unit configured to align the liquid crystal in a homeotropic state.

17. The light controlling apparatus according to claim 16 , wherein the alignment unit is on or under the liquid crystal unit.

18. A display device comprising:
a display panel; and
at least one light controlling apparatus according to claim 1 attached to the display panel.

19. The display device according to claim 18 , wherein the display panel is an OLED panel.

20. The display device according to claim 18 , wherein the light controlling apparatus is attached to the front surface of the display panel.

21. The display device according to claim 18 , wherein the light controlling apparatus is attached to the rear surface of the display panel.

22. A mixed liquid crystal in which a liquid crystal, a first monomer and a second monomer are present, wherein the first monomer has a similar shape as the liquid crystal to assist in vertical alignment of the liquid crystal when an electric field is not applied and the second monomer has a shape different from the first monomer to assist in random alignment of the liquid crystal when an electric field is applied, and wherein the mixed liquid crystal having the first monomer and the second monomer is configured to have both a network and a wall in a light controlling apparatus.

23. The mixed liquid crystal according to claim 22 , wherein the light controlling apparatus exhibits a transparent mode with the liquid crystal in a homeotropic state when a voltage is not applied, and wherein the light controlling apparatus exhibits a light shielding mode with the liquid crystal in a random state when a voltage is applied.

24. The mixed liquid crystal according to claim 22 , wherein UV wavelengths for polymerizing the first monomer are in the same wavelength range as UV wavelengths for polymerizing the second monomer.

25. The mixed liquid crystal according to claim 22 , wherein the first monomer includes an RM (reactive mesogen)-based monomer.

26. The mixed liquid crystal according to claim 22 , wherein the second monomer includes a Bisphenol A Dimethacrylate-based monomer.

27. The mixed liquid crystal according to claim 22 , wherein the first monomer and the second monomer are polymerized by irradiation with UV rays.

28. The mixed liquid crystal according to claim 22 , wherein the liquid crystal includes one among a positive liquid crystal, a negative liquid crystal or a DFLC (dual frequency liquid crystal).

Assignees

• Lg Display Co Ltd

Inventors

• Kim Kihan
• Ahn Jiyoung
• Lee Moonsun
• Kim Pureum
• Ji Seokwon

Classifications

• G02F1/1334

  based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals · CPC title

• C09K19/542

  Macromolecular compounds · CPC title

• G02F2202/04

  dye · CPC title

• H01L27/3232

  Electricity · mapped topic

• G02F2201/44

  Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers · CPC title