Liquid crystal element, deflection element, liquid crystal module, and electronic device

Patent metadata

Field	Value
Publication number	US-10095081-B2
Application number	US-201615545177-A
Country	US
Kind code	B2
Filing date	Jan 20, 2016
Priority date	Jan 23, 2015
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

A liquid crystal element includes: a first electrode to which a first voltage is applied; a second electrode to which a second voltage is applied; an insulating layer that is an electrical insulator; a highly resistive layer; a liquid crystal layer containing liquid crystal; a third electrode to which a third voltage is applied; a first boundary layer that is an electrical insulator; and a second boundary layer that faces the first boundary layer with the insulating layer therebetween. The insulating layer is located among the first electrode, the second electrode, and the highly resistive layer, and insulates the first electrode, the second electrode, and the highly resistive layer from one another. The highly resistive layer has an electric resistivity higher than each of electric resistivities of the first electrode and the second electrode, and lower than an electric resistivity of the insulating layer.

First claim

The invention claimed is:

1. A liquid crystal element that refracts light exiting therefrom, the liquid crystal element comprising:
a first electrode to which a first voltage is applied;
a second electrode to which a second voltage is applied, the second voltage being different from the first voltage;
an insulating layer that is an electrical insulator;
a resistive layer;
a liquid crystal layer containing liquid crystal;
a third electrode to which a third voltage is applied;
a first boundary layer that is an electrical insulator; and
a second boundary layer that faces the first boundary layer with the insulating layer therebetween, wherein
the insulating layer is located among the first electrode, the second electrode, and the resistive layer, and insulates the first electrode, the second electrode, and the resistive layer from one another,
the resistive layer has an electric resistivity higher than each of electric resistivities of the first electrode and the second electrode, and lower than an electric resistivity of the insulating layer,
the resistive layer and the liquid crystal layer are located between the insulating layer and the third electrode,
the resistive layer is located between the insulating layer and the liquid crystal layer,
the second boundary layer is a resistor having an electric resistivity higher than the electric resistivity of the resistive layer or an electrical insulator,
the first electrode and the second electrode constitute a unit electrode,
the unit electrode includes a plurality of unit electrodes,
a second electrode of one unit electrode of mutually adjacent unit electrodes among the plurality of unit electrodes is adjacent to a first electrode of the other unit electrode of the mutually adjacent unit electrodes,
the first boundary layer is located between the second electrode and the first electrode that are adjacent to each other,
the resistive layer includes a plurality of resistive layers corresponding to the plurality of unit electrodes, and
the second boundary layer is located between mutually adjacent resistive layers among the plurality of resistive layers.

2. The liquid crystal element according to claim 1 , wherein
the first electrode and the second electrode linearly extend side by side.

3. The liquid crystal element according to claim 2 , wherein
the liquid crystal layer has a linear electric potential gradient relative to a direction from the first electrode to the second electrode for each of the plurality of unit electrodes.

4. The liquid crystal element according to claim 1 , further comprising a center electrode having a circular ring shape, wherein
the center electrode and the plurality of unit electrodes are in concentric circular arrangement centered about the center electrode,
in each of the plurality of unit electrodes, the unit electrode has a width that indicates a distance between the first electrode and the second electrode, and
in each of the plurality of unit electrodes, the second electrode has a radius larger than a radius of the first electrode.

5. The liquid crystal element according to claim 4 , wherein
in mutually adjacent unit electrodes among the plurality of unit electrodes, a unit electrode having a larger radius than the other unit electrode has a width smaller than a width of the other unit electrode having a smaller radius,
in each of the plurality of unit electrodes, the radius of the second electrode represents a radius of the unit electrode.

6. The liquid crystal element according to claim 5 , wherein
a radius Rn of each of the plurality of unit electrodes is represented by an expression shown below, where
n represents an integer from 1 to N assigned to the respective plurality of unit electrodes incrementally from a unit electrode having a smallest radius to a unit electrode having a largest radius among the plurality of unit electrodes,
N represents the number of the plurality of unit electrodes, and
Rc represents a radius of the center electrode
Rn =( n+ 1) 1/2 ×Rc.

7. The liquid crystal element according to claim 1 , further comprising:
a first lead wire to which the first voltage is applied;
a second lead wire to which the second voltage is applied;
a third boundary layer that is an electrical insulator, the third boundary layer being located between the first lead wire and the second lead wire; and
an opposed layer that is a resistor having an electric resistivity higher than the electric resistivity of the resistive layer or an electrical insulator, wherein
the first electrode and the second electrode each have a shape of an open curve,
one end of opposite ends of the first electrode is connected to the first lead wire,
the other end of the opposite ends of the first electrode is located opposite to the second lead wire,
one end of opposite ends of the second electrode is connected to the second lead wire,
the other end of the opposite ends of the second electrode is located opposite to the first lead wire, and
the opposed layer is located opposite to the first lead wire, the third boundary layer, and the second lead wire with the insulating layer therebetween.

8. The liquid crystal element according to claim 1 , wherein
a distance between the first electrode and the second electrode of the unit electrode is larger than each of a width of the first electrode and a width of the second electrode.

9. A deflection element that deflects light exiting therefrom, the deflection element comprising
two liquid crystal elements each being the liquid crystal element according to claim 1 , wherein
the first electrode and the second electrode of one liquid crystal element of the two liquid crystal elements extend along a first direction,
the first electrode and the second electrode of the other liquid crystal element of the two liquid crystal elements extend along a second direction orthogonal to the first direction, and
the one liquid crystal element and the other liquid crystal element overlap with each other.

10. A liquid crystal module comprising:
the liquid crystal element according to claim 1 ; and
a cover member covering an imaging element, wherein
the liquid crystal element is attached to an outer surface portion of the cover member to be located opposite to an imaging surface of the imaging element.

11. An electronic device comprising:
the liquid crystal element according to claim 1 ;
an imaging element;
a cover member covering the imaging element; and
a housing accommodating the liquid crystal element, the imaging element, and the cover member, wherein
the liquid crystal element is attached to an inner surface portion of the housing to be located opposite to an imaging surface of the imaging element.

12. An electronic device, comprising:
the liquid crystal element according to claim 1 ;
an imaging element configured to image an object through the liquid crystal element;
a vibration sensor configured to detect vibration due to camera shaking; and
a controller configured to control either or both of the first voltage and the second voltage depending on vibration detected by the vibration sensor to refract light incident on the imaging element through the liquid crystal element.

Assignees

• Univ Osaka

Inventors

• Shibuya Giichi
• Yoshida Hiroyuki
• Ozaki Masanori

Classifications

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• H04N23/6812

  based on additional sensors, e.g. acceleration sensors · CPC title

• H04N23/57

  Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices · CPC title

• G02F1/29 Primary

  for the control of the position or the direction of light beams, i.e. deflection · CPC title

• H04N5/23258

  Electricity · mapped topic