Electro-optical device

• US 8,400,593 B2
• Filed: 04/22/2010
• Issued: 03/19/2013
• Est. Priority Date: 10/22/2009
• Status: Expired due to Fees

• Current Assignee: National Chiao Tung University (Government of The Republic of China)
• Original Assignee: National Chiao Tung University (Government of The Republic of China)
• Inventors: Fan, Shih-Kang, Chiu, Cheng-Pu
• Primary Examiner(s): Kianni, K. Cyrus
• Application Number:
  US12/765,642
• Publication Number:
  US 20110096276A1
• Time in Patent Office: 1,062 Days
• Field of Search: 349/122, 349/21
• US Class Current: 349/122
• CPC Class Codes: G02B 26/004 based on a displacement or a deformation of a fluid
• CPC Class Codes: G02B 26/005 based on electrowetting
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 2201/44 Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers

Abstract

An electro-optical device includes a body of fluid, a lower conductor layer disposed below the body of fluid, and a dielectric layer disposed between the body of fluid and the lower conductor layer, connected to the lower conductor layer and supporting the body of fluid. The dielectric layer includes a matrix and a liquid crystal material disposed in the matrix and including liquid crystal molecules. The dielectric layer has a segment disposed adjacent to the fluid. When the segment of the dielectric layer is exposed to an electric field, the body of fluid undergoes electrowetting or dielectrophoresis mechanism, and the orientation of the liquid crystal molecules that are disposed in the segment of the dielectric layer is changed.

Claims

1. An electro-optical device comprising:

a body of fluid;

a lower conductor layer disposed below said body of fluid; and

a dielectric layer disposed between said body of fluid and said lower conductor layer, connected to said lower conductor layer, and supporting said body of fluid, said dielectric layer including a matrix of a dielectric material and a liquid crystal material disposed in said matrix and including liquid crystal molecules, said dielectric layer having a segment disposed adjacent to said body of fluid;

wherein when said segment of said dielectric layer is exposed to an electric field, said body of fluid undergoes electrowetting or dielectrophoresis mechanism and the orientation of said liquid crystal molecules that are disposed in said segment of said dielectric layer is changed,

wherein said body of fluid is conductive and is in the form of a liquid droplet, said lower conductor layer including a plurality of electrodes, said dielectric layer including a plurality of said segments overlapping said electrodes of said lower conductor layer, respectively, when one of said segments of said dielectric layer is exposed to the electric field and when said body of fluid is disposed above and covers an adjacent one of said segments of said dielectric layer, that is adjacent to said one of said segments of said dielectric layer, and a portion of said one of said segments of said dielectric layer, said body of fluid undergoing electrowetting mechanism so as to be moved from said adjacent one of said segments to said one of said segments to cover entirely said one of said segments of said dielectric layer.

2. The electro-optical device of claim 1, wherein said matrix is a polymer, and said liquid crystal material includes a plurality of droplets of said liquid crystal molecules dispersed in said polymer.

3. The electro-optical device of claim 1, wherein said body of fluid is conductive and is in the form of a liquid droplet, and said segment of said dielectric layer is covered by said body of fluid so that said body of fluid undergoes electrowetting mechanism when said segment of said dielectric layer is exposed to the electric field.

4. The electro-optical device of claim 3, further comprising a confining wall that is disposed above said dielectric layer and that defines an inner space for receiving said body of fluid.

5. The electro-optical device of claim 4, further comprising a dielectric oil that is received in said inner space and that is immiscible with said body of fluid.

6. The electro-optical device of claim 5, wherein said body of fluid is surrounded by said dielectric oil.

7. An electro-optical device comprising:

a body of fluid;

a lower conductor layer disposed below said body of fluid;

a dielectric layer disposed between said body of fluid and said lower conductor layer, connected to said lower conductor layer, and supporting said body of fluid, said dielectric layer including a matrix of a dielectric material and a liquid crystal material disposed in said matrix and including liquid crystal molecules, said dielectric layer having a segment disposed adjacent to said body of fluid;

wherein when said segment of said dielectric layer is exposed to an electric field, said body of fluid undergoes electrowetting or dielectrophoresis mechanism and the orientation of said liquid crystal molecules that are disposed in said segment of said dielectric layer is changed; and

an upper conductor layer disposed above said body of fluid, said body of fluid being in the form of a dielectric liquid droplet, said lower conductor layer including a plurality of electrodes, said dielectric layer including a plurality of said segments overlapping said electrodes of said lower conductor layer, respectively, when one of said segments of said dielectric layer is exposed to the electric field and when said body of fluid is disposed above and covers an adjacent one of said segments of said dielectric layer that is adjacent to said one of said segments of said dielectric layer, said body of fluid undergoing dielectrophoresis mechanism so as to be moved from said adjacent one of said segments of said dielectric layer to said one of said segments of said dielectric layer.

8. The electro-optical device of claim 7, wherein said matrix is a polymer, and said liquid crystal material includes a plurality of droplets of said liquid crystal molecules dispersed in said polymer.

9. The electro-optical device of claim 7, wherein said body of fluid is conductive and is in the form of a liquid droplet, and said segment of said dielectric layer is covered by said body of fluid so that said body of fluid undergoes electrowetting mechanism when said segment of said dielectric layer is exposed to the electric field.

10. The electro-optical device of claim 9, further comprising a confining wall that is disposed above said dielectric layer and that defines an inner space for receiving said body of fluid.

11. The electro-optical device of claim 10, further comprising a dielectric oil that is received in said inner space and that is immiscible with said body of fluid.

12. The electro-optical device of claim 11, wherein said body of fluid is surrounded by said dielectric oil.