Process for forming liquid crystal layer of PDLCD by forming layers of polymer, liquid crystal and polymer in that order

• US 5,583,672 A
• Filed: 11/29/1993
• Issued: 12/10/1996
• Est. Priority Date: 11/13/1991
• Status: Expired due to Fees

• Current Assignee: Samsung Electron Devices Co., Ltd. (Samsung SDI Company Limited)
• Original Assignee: Samsung Electron Devices Co., Ltd. (Samsung SDI Company Limited)
• Inventors: Kim, Kwang-su
• Primary Examiner(s): GROSS, ANITA P
• Application Number:
  US08/158,898
• Time in Patent Office: 1,107 Days
• Field of Search: 359/51, 359/52
• US Class Current: 349/92
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals

Abstract

To uniform the liquid crystal particle of the liquid crystal layer of a PDLCD where a liquid crystal is scattered and emulsified with a polymer, the polymer is scattered on a conductive layer of a substrate. The liquid crystal is scattered thereon to be emulsified during a predetermined hour. Thereafter, by the same method as that of forming the polymer layer, the polymer is scattered on the liquid crystal layer to form a second polymer layer thereby obtaining the homogeneous thickness of the liquid crystal layer of the PDLCD.

Claims

1. A process for forming a polymer dispersed liquid crystal display element comprising the steps of:

preparing a liquid polymer comprising a polymer and solvent,

forming a first polymer layer by scattering liquid polymer on a predetermined area of a substrate;

forming a liquid crystal layer by scattering liquid crystals of predetermined droplet size on the polymer layer; and

forming a second polymer layer by scattering liquid polymer upon the liquid crystal layer whereby the liquid polymer permeates among the droplets of liquid crystal so that droplets of liquid crystal are interposed within the polymer of said first and second polymer layers, thereby forming a dispersion of liquid crystal droplets in polymer.

2. The process as claimed in claim 1 further comprising allowing said polymer and liquid crystal to stand undisturbed for about 2 to 5 hours after forming the liquid crystal layer on the first polymer layer and before forming the second polymer layer upon the liquid crystal layer.

3. The process as claimed in claim 1, wherein the thickness of each of the first and second polymer layer is about 4 to 5 μ

m.

4. The process as claimed in claim 1, wherein the thickness of the liquid crystal layer is about 2 to 3 μ

m.