Light controlling apparatus and method of fabricating the same

• US 9,804,467 B2
• Filed: 08/27/2015
• Issued: 10/31/2017
• Est. Priority Date: 12/02/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Kihan, Ahn, Jiyoung, Lee, Moonsun, Kim, Pureum, Ji, Seokwon
• Primary Examiner(s): Malsawma, Lex
• Application Number:
  US14/837,090
• Publication Number:
  US 20160154259A1
• Time in Patent Office: 796 Days
• Field of Search: None
• CPC Class Codes: C09K 19/542 Macromolecular compounds
• CPC Class Codes: C09K 2019/546 creating a polymeric network
• CPC Class Codes: G02F 1/133377 Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/133711 by organic films, e.g. polymeric films
• CPC Class Codes: G02F 1/133726 made of a mesogenic material
• CPC Class Codes: G02F 1/133742 for homeotropic alignment
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• 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 1/137 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
• CPC Class Codes: G02F 1/13756 the liquid crystal selectively assuming a light-scattering state G02F1/1334, G02F1/13718 take precedence
• CPC Class Codes: G02F 1/13775 Polymer-stabilized liquid crystal layers
• CPC Class Codes: G02F 2201/44 Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
• CPC Class Codes: G02F 2202/023 curable
• CPC Class Codes: G02F 2202/04 dye
• CPC Class Codes: G02F 2203/01 transmissive
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 59/126 Shielding, e.g. light-blocking means over the TFTs
• CPC Class Codes: H10K 59/50 OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

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.

Claims

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).