# US 8,570,461 B2 · Polymer-dispersed liquid crystal display device and method of manufacturing the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,570,461 B2
- Document ID: US8570461B2
- Status: Granted
- Kind: B2
- Application number: 12/923,374
- Filed: 2010-09-17
- Published: 2011-06-09
- Granted: 2013-10-29
- Earliest claimed: 2009-12-08
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Gae-hwang Lee; Jae-eun Jang; Jae-eun Jung; Kyu-young Hwang
- Inventors: Gae-hwang Lee; Jae-eun Jang; Jae-eun Jung; Kyu-young Hwang
- Web page: https://patentgrep.com/patent/US8570461B2

## CPC

- G02F 1/1334: based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
- G02F 1/133377: {Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

Provided are a polymer-dispersed liquid crystal (PDLC) display device and a method of manufacturing the same. The PDLC display device may include a PDLC layer between facing substrates, wherein the PDLC layer has at least two regions including polymers having different concentrations.

## Claims

### Claim 1

A polymer-dispersed liquid crystal (PDLC) display device comprising:
a first substrate and a second substrate configured to face each other;
a first electrode and a second electrode on the first substrate and the second substrate, respectively; and
a PDLC layer between the first electrode and the second electrode, the PDLC layer including at least one first region containing polymers in a concentration of about 5-25 wt % and at least one second region containing the polymers in a concentration higher than the concentration of the at least one first region,
wherein each of the at least one first region and the at least one second region extend from an upper surface of the first electrode to a lower surface of the second electrode.

### Claim 2 (depends on 1)

The PDLC display device of claim 1, wherein the PDLC layer further comprises liquid crystals.

### Claim 3 (depends on 1)

The PDLC display device of claim 1, wherein the at least one first and second regions are provided alternately and repetitively.

### Claim 4 (depends on 1)

The PDLC display device of claim 1, wherein
the at least one first region containing the polymers in the concentration of about 5-25 wt % corresponds with an effective display region of a pixel and the at least one second region corresponds with a non-display region of the pixel.

### Claim 5

A method of manufacturing a polymer-dispersed liquid crystal (PDLC) display device, the method comprising:
injecting a mixture including a photocurable material between a first electrode and a second electrode configured to face each other;
applying light to the mixture through a photomask including patterns having different light transmittances; and
forming a PDLC layer including polymers by absorbing the light into the photocurable material, the PDLC layer including at least one first region containing polymers in a concentration of about 5-25 wt % and at least one second region containing the polymers in a concentration higher than the concentration of the at one first region,
wherein the at least one first and second regions are provided alternately and repetitively, and
wherein each of the at least one first region and the at least one second region extend from an upper surface of the first electrode to a lower surface of the second electrode.

### Claim 6 (depends on 5)

The method of claim 5, wherein the mixture further comprises liquid crystals.

### Claim 7 (depends on 5)

The method of claim 5, further comprising:
applying light to the mixture after removing the photo-mask.

### Claim 8 (depends on 5)

The method of claim 5, wherein the concentration of the polymers in the at least one second region of the PDLC layer is higher than a concentration of the photocurable material in the mixture.

### Claim 9 (depends on 5)

The method of claim 5, wherein the concentration of the polymers in the at least one first region of the PDLC layer is lower than a concentration of the photocurable material in the mixture.

### Claim 10 (depends on 2)

The PDLC display device of claim 2, wherein the liquid crystals are present in the at least one first and second regions.

### Claim 11 (depends on 6)

The method of claim 6, wherein the liquid crystals are present in the at least one first and second regions.

### Claim 12 (depends on 1)

The PDLC display device of claim 1, wherein the concentration of the at least one second region is about 25 wt % or higher.

### Claim 13 (depends on 5)

The method of claim 5, wherein the concentration of the at least one second region is about 25 wt % or higher.

### Claim 14 (depends on 5)

The method of claim 5, wherein the at least one first region containing the polymers in the concentration of about 5-25 wt % corresponds with an effective display region of a pixel.

### Claim 15 (depends on 1)

The polymer-dispersed liquid crystal (PDLC) display device of claim 1, wherein the at least one first region has a first thickness extending in a first direction and the at least one second region has a second thickness extending in the first direction, the second thickness being greater than the first thickness.

### Claim 16 (depends on 1)

The polymer-dispersed liquid crystal (PDLC) display device of claim 1, wherein a portion of the at least one first region contacting the second electrode is less than a portion contacting the first electrode and a portion of the at least one second region contacting the second electrode is greater than a portion contacting the first electrode.

### Claim 17 (depends on 5)

The method of claim 5, wherein the at least one first region has a first thickness extending in a first direction and the at least one second region has a second thickness extending in the first direction, the second thickness being greater than the first thickness.

### Claim 18 (depends on 5)

The method of claim 5, wherein a portion of the at least one first region contacting the second electrode is less than a portion contacting the first electrode and a portion of the at least one second region contacting the second electrode is greater than a portion contacting the first electrode.