# US 8,570,483 B2 · Liquid crystal lens

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- Number: US 8,570,483 B2
- Document ID: US8570483B2
- Status: Granted
- Kind: B2
- Application number: 12/789,447
- Filed: 2010-05-27
- Published: 2011-10-13
- Granted: 2013-10-29
- Earliest claimed: 2010-04-12
- Assignees: Chunghwa Picture Tubes, Ltd.
- Applicants: Sheng-Chi Liu; Cheng-Chung Hu
- Inventors: Sheng-Chi Liu; Cheng-Chung Hu
- Web page: https://patentgrep.com/patent/US8570483B2

## CPC

- G02F 1/29: for the control of the position or the direction of light beams, i.e. deflection
- G02F 1/134309: {characterised by their geometrical arrangement}
- G02F 1/294: {Variable focal length devices}
- 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

A liquid crystal lens including a first substrate, a first electrode layer, a liquid crystal layer and a second electrode layer is provided. The second electrode layer includes a plurality of first electrode patterns and a plurality of second electrode patterns. The second electrode patterns are opposite to the first electrode patterns, respectively, and the second electrode patterns and the first electrode patterns are alternately arranged. A square measure of first or second electrode patterns decreases from an edge of the liquid crystal lens to a center of the liquid crystal lens, so that a resistance of the first or second electrode patterns increases from the edge to the center of the liquid crystal lens.

## Claims

### Claim 1

A liquid crystal lens, comprising:
a first substrate;
a first electrode layer disposed on the first substrate;
a liquid crystal layer disposed on the first electrode layer; and
a second electrode layer disposed on the liquid crystal layer, comprising:
a plurality of first electrode patterns;
a plurality of second electrode patterns respectively opposite to the first electrode patterns, and the second electrode patterns and the first electrode patterns being alternately arranged, wherein a square measure of the first electrode patterns decreases from an edge of the liquid crystal lens to a center of the liquid crystal lens, so that a resistance of the first electrode patterns increases from the edge of the liquid crystal lens to the center of the liquid crystal lens, a square measure of the second electrode patterns decreases from the edge of the liquid crystal lens to the center of the liquid crystal lens, so that a resistance of the second electrode patterns increases from the edge of the liquid crystal lens to the center of the liquid crystal lens, a portion of each of the first and second electrode patterns has a same width, and a width of other portions of each of the first and second patterns decreases from the edge to the center of the liquid crystal lens.

### Claim 2 (depends on 1)

The liquid crystal lens as claimed in claim 1, wherein the second electrode layer further comprises a first main segment and a second main segment, the first main segment is parallel to the second main segment, the first main segment is coupled to the first electrode patterns, the second main segment is coupled to the second electrode patterns, and the first and second electrode patterns are respectively perpendicular to the first and second main segments.

### Claim 3 (depends on 2)

The liquid crystal lens as claimed in claim 2, wherein the first main segment is electrically connected to a first signal source, the second main segment is electrically connected to a second signal source, the first and second signal sources respectively providing an alternating current signal to the first and second electrode patterns, such that the first electrode patterns and the second electrode patterns respectively has an amplitude difference and a phase difference.

### Claim 4 (depends on 3)

The liquid crystal lens as claimed in claim 3, wherein a voltage range of the alternating current signal is less than 50 volts.

### Claim 5 (depends on 1)

The liquid crystal lens as claimed in claim 1, wherein the first and second electrode patterns are disposed on two sides of the liquid crystal lens, the first electrode patterns disposed on one of the sides of the liquid crystal lens are symmetrical with respect to the first electrode patterns disposed on the other side of the liquid crystal lens, and the second electrode patterns disposed on one of the sides of the liquid crystal lens are symmetrical with respect to the second electrode patterns disposed on the other side of the liquid crystal lens.

### Claim 6 (depends on 5)

The liquid crystal lens as claimed in claim 5, wherein on one of the sides of the liquid crystal lens, a distance between each of the first electrode patterns and an adjacent one of the second electrode patterns is the same or different.

### Claim 7 (depends on 1)

The liquid crystal lens as claimed in claim 1, further comprising:
a first alignment layer disposed between the first electrode layer and the liquid crystal layer; and
a second alignment layer disposed between the liquid crystal layer and the second electrode layer.

### Claim 8 (depends on 1)

The liquid crystal lens as claimed in claim 1, further comprising:
a second substrate disposed on the second electrode layer.

### Claim 9 (depends on 1)

The liquid crystal lens as claimed in claim 1, further comprising:
a second substrate disposed between the second electrode layer and the liquid crystal layer.

### Claim 10 (depends on 1)

The liquid crystal lens as claimed in claim 1, wherein a width of each of the first and second electrode patterns decreases from the edge to the center of the liquid crystal lens.

### Claim 11 (depends on 1)

The liquid crystal lens as claimed in claim 1, wherein the width of each of the first and second electrode patterns is between 2 micrometers to 500 micrometers, inclusive.

### Claim 12 (depends on 1)

The liquid crystal lens as claimed in claim 1, wherein a material of the first and second electrode layers comprises indium tin oxide (ITO) or indium zinc oxide (IZO).

### Claim 13 (depends on 1)

The liquid crystal lens as claimed in claim 1, wherein the first and second electrode patterns are respectively coupled to a plurality of signal sources, the signal sources respectively providing an alternating current signal to the first and second electrode patterns, such that the first electrode patterns and the second electrode patterns respectively has an amplitude difference and a phase difference.