Liquid crystal display with split electrode

• US 7,876,399 B2
• Filed: 08/19/2008
• Issued: 01/25/2011
• Est. Priority Date: 08/19/2008
• Status: Expired due to Fees

• Current Assignee: World Properties Incorporated
• Original Assignee: Rogers Corporation (Rogers Communications Inc.)
• Inventors: Kimball, Robert Allen, Seelhammer, Mark A., Pires, David G.
• Primary Examiner(s): Kianni; K. Cyrus
• Application Number:
  US12/229,050
• Publication Number:
  US 20100045180A1
• Time in Patent Office: 889 Days
• Field of Search: 349/69, 349/86
• US Class Current: 349/69
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134354 the sub-pixels being capacitively coupled
• CPC Class Codes: G02F 2201/44 Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers

Abstract

A light shutter includes a first electrode, a second electrode, and a third electrode, wherein the first and second electrodes are capacitively coupled to each other by the third electrode. The first electrode and the second electrode can be segmented and the segments separately addressed. In a display having a light shutter and an EL panel stacked on the same side of a substrate, there is a common front electrode and separate rear electrodes for operating the light shutter and the EL panel. The common electrode is electrically floating and the rear electrodes are capacitively coupled to each other by the common front electrode. The rear electrodes can be segmented and the segments separately addressed.

Claims

1. A display comprising:

a light shutter including a layer of polymer disposed liquid crystal material, a first electrode, a second electrode, and a third electrode,

wherein the first and second electrodes are capacitively coupled to each other by the third electrode,

wherein said first electrode and said second electrode are on a first side of said layer and the third electrode is on a second side of the layer, opposite the first electrode and the second electrode, and

wherein the first electrode and the second electrode are coupled to a source of voltage and said third electrode is electrically floating.

2. The display as set forth in claim 1 and further including a fourth electrode on said first side of said layer, said fourth electrode being selectively coupled to one of the first electrode and the second electrode.

3. The display as set forth in claim 1 and further including a transparent substrate and an EL layer,

wherein said light shutter overlies the transparent substrate, said EL layer overlies the light shutter, said first electrode is between the light shutter and the EL layer, and said second electrode overlies the EL layer.

4. The display as set forth in claim 3 wherein the second electrode has plural segments.

5. The display as set forth in claim 4 wherein the segments are separately addressable.

6. The display as set forth in claim 3 wherein the first electrode has plural segments.

7. The display as set forth in claim 6 wherein the segments are separately addressable.

8. The display as set forth in claim 3 wherein the first and second electrodes each have plural segments.

9. The display as set forth in claim 8 wherein the plural segments are separately addressable.

10. The display as set forth in claim 9 wherein selecting a particular combination of segments causes a first region of the EL layer to emit light and a corresponding region of the light shutter to be opaque, thereby blocking the light from the first region.

11. The display as set forth in claim 10 wherein selecting said particular combination of segments causes a second region of the EL layer to increase in brightness and a second light shutter to be transparent.

12. The display as set forth in claim 3 wherein the EL layer is patterned.

13. The display as set forth in claim 3 wherein the first electrode controls the opacity of the light shutter, and the second electrode controls emissions from the EL layer.

14. The display as set forth in claim 13 wherein said third electrode overlies said transparent substrate and the light shutter overlies said third electrode.