Liquid crystal lens device and method for driving liquid crystal lens device

Patent metadata

Field	Value
Publication number	US-9310632-B2
Application number	US-201314145085-A
Country	US
Kind code	B2
Filing date	Dec 31, 2013
Priority date	Jul 8, 2013
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A liquid crystal (LC) lens device and a method for driving the LC lens device are provided. The LC lens device includes an LC lens array and a driving device, and the LC lens array includes LC lenses in parallel. Each LC lens includes a first substrate, first electrodes disposed on the first substrate, a second substrate, second electrodes on the second substrate, and an LC layer disposed between the first electrodes and the second electrodes to form a Fresnel lens. The driving device is electrically connected to the second electrodes of each LC lens, and provides driving voltages respectively to each of the second electrodes in an order starting from the second electrodes disposed at the edges of the Fresnel lens and ending at the second electrode disposed at the middle of a main lobe region of the Fresnel lens, and there is a preset time difference between driven starting times of every adjacent two second electrodes.

First claim

What is claimed is:

1. A liquid crystal (LC) lens device, comprising:
an LC lens array comprising a plurality of LC lenses in parallel, each LC lens comprising:
a first substrate;
a plurality of first electrodes disposed on a first surface of the first substrate;
a second substrate;
a plurality of second electrodes disposed on a second surface of the second substrate, the second surface opposite to the first surface; and
an LC layer disposed between the first electrodes and the second electrodes to form a Fresnel lens; wherein the Fresnel lens comprises a main lobe region and a plurality of side lobe regions, the second electrodes are divided into four groups respectively defined as a first group, a second group, a third group and a fourth group, the second electrodes of the first group are disposed in the main lobe region, each of the second electrodes of the second group is disposed at edges of the Fresnel lens, each of the second electrodes of the third group is disposed at a junction of the main lobe region and one side lobe region, or a junction of two adjacent side lobe regions, and each of the second electrodes of the fourth group is disposed in one side lobe region; and
a driving device electrically connected to the second electrodes of each LC lens, wherein the driving device provides driving voltages respectively to each of the second electrodes in an order starting from the second electrodes disposed at the edges of the Fresnel lens and ending at the second electrode disposed at the middle of the main lobe region, and there is a preset time difference between driven starting times of every adjacent two second electrodes,
wherein the preset time difference is equal to a result of a response time of LC molecules in each LC lens multiplying a preset percentage.

2. The LC lens device as claimed in claim 1 , wherein the preset percentage is equal to 25%.

3. The LC lens device as claimed in claim 1 , wherein each side lobe region comprises a plurality of second electrodes of the fourth group.

4. A method for driving a liquid crystal (LC) lens, the LC lens comprising a first substrate, a plurality of first electrodes disposed on a first surface of the first substrate, a second substrate, a plurality of second electrodes disposed on a second surface of the second substrate, the second surface opposite to the first surface, an LC layer disposed between the first electrodes and the second electrodes to form a Fresnel lens, the Fresnel lens comprising a main lobe region and a plurality of side lobe regions, the second electrodes being divided into four groups respectively defined as a first group, a second group, a third group and a fourth group, the second electrodes of the first group disposed in the main lobe region, each of the second electrodes of the second group disposed at edges of the Fresnel lens, each of the second electrodes of the third group disposed at a junction of the main lobe region and one side lobe region, or a junction of two adjacent side lobe regions, and each of the second electrodes of the fourth group disposed in one side lobe region; and the method comprising:
providing driving voltages respectively to each of the second electrodes in an order starting from the second electrodes disposed at the edges of the Fresnel lens and ending at the second electrode disposed at the middle of the main lobe region, and a preset time difference being between driven starting times of every adjacent two second electrodes, wherein the preset time difference is equal to a result of a response time of LC molecules in each LC lens multiplying a preset percentage.

5. The method as claimed in claim 4 , wherein the preset percentage is equal to 25%.

6. The method as claimed in claim 4 , wherein each side lobe region comprises a plurality of second electrodes of the fourth group.

7. A liquid crystal (LC) lens device, comprising:
an LC lens array comprising: a plurality of LC lenses in parallel, each LC lens comprising:
a first substrate;
a plurality of first electrodes disposed on a first surface of the first substrate;
a second substrate;
a plurality of second electrodes disposed on a second surface of the second substrate, the second surface opposite to the first surface; and
an LC layer disposed between the first electrodes and the second electrodes to form a Fresnel lens; wherein the Fresnel lens comprises a main lobe region and a plurality of side lobe regions, the second electrodes are divided into four groups respectively defined as a first group, a second group, a third group and a fourth group, the second electrodes of the first group are disposed in the main lobe region, each of the second electrodes of the second group is disposed at edges of the Fresnel lens, each of the second electrodes of the third group is disposed at a junction of the main lobe region and one side lobe region, or a junction of two adjacent side lobe regions, and each of the second electrodes of the fourth group is disposed in one side lobe region; and
a driving device electrically connected to the second electrodes, wherein the driving device simultaneously provides adjusted driving voltages respectively to the second electrodes of each of the groups during a preset period, the adjusted driving voltages respectively provided to the second electrodes of the second group increase a first preset percentage over an original driving voltage, the adjusted driving voltages respectively provided to the second electrodes of the third group decrease a second preset percentage below the original driving voltage, the adjusted driving voltage provided to each of the second electrodes of the fourth group is a result of an absolute value being divided by two, where the absolute value is obtained from a difference value between the adjusted voltage of a second electrode of the second group nearest to the second electrodes of the fourth group and the adjusted voltage of a second electrode of the third group nearest to the second electrode of the fourth group, or the absolute value is obtained from a difference value between the adjusted voltages of two of the second electrodes of the third group nearest to the second electrode of the fourth group, and the preset period is equal to a result of a response time of LC molecules in the LC lens multiplying a third preset percentage.

8. The LC lens device as claimed in claim 7 , wherein the first preset percentage is less than 6%.

9. The LC lens device as claimed in claim 7 , wherein the second preset percentage is less than 10%.

10. The LC lens device as claimed in claim 7 , wherein the third preset percentage is equal to 25%.

11. The LC lens device as claimed in claim 7 , wherein each side lobe region comprises a plurality of second electrodes of the fourth group.

12. The LC lens device as claimed in claim 7 , wherein the driving device provides the original driving voltage to the second electrodes after the preset period.

13. A method for driving a liquid crystal (LC) lens, the LC lens comprising: a first substrate, a plurality of first electrodes disposed on a first surface of the first substrate, a second substrate, a plurality of second electrodes disposed on a second surface of the second substrate, the second surface opposite to the first surface, an LC layer disposed between the first electrodes and the second electrodes to form a Fresnel lens, the Fresnel lens comprising a main lobe region and a plurality of side lobe regions, the second electrodes being divided into four groups respectively defined as a first group, a second group, a third group and a fourth group, the second electrodes of the first group disposed in the main lobe r

Assignees

• Au Optronics Corp

Inventors

• Huang Chih-Yuan
• Ho Sheng-Ju
• Chen I-Wei

Classifications

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/13306 Primary

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title

• G02B30/27

  involving lenticular arrays · CPC title

• H04N13/322

  using varifocal lenses or mirrors · CPC title

• G02F2203/28

  focussing or defocussing · CPC title