Optical element

Patent metadata

Field	Value
Publication number	US-10908452-B2
Application number	US-201816168996-A
Country	US
Kind code	B2
Filing date	Oct 24, 2018
Priority date	Oct 27, 2017
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

According to one embodiment, an optical element, including a first liquid crystal lens formed of liquid crystal molecules, a polarizer opposed to the first liquid crystal lens, a first modulating portion located between the first liquid crystal lens and the polarizer to modulate incident light and a first unmodulating portion located between the first liquid crystal lens and the polarizer and adjacent to the first modulating portion.

First claim

What is claimed is:

1. An optical element, comprising:
a first liquid crystal lens formed of liquid crystal molecules, and functioning as a convex lens having a refractive index distribution corresponding to an aligned state of the liquid crystal molecules;
a polarizer;
a first modulating portion located between the first liquid crystal lens and the polarizer, and transmitting incident light while rotating a polarization plane; and
a first unmodulating portion adjacent to the first modulating portion between the first liquid crystal lens and the polarizer in a first direction, and transmitting incident light,
the first liquid crystal lens, the first modulating portion, the first unmodulating portion, and the polarizer being arranged in this order in a second direction intersecting the first direction,
the first liquid crystal lens, the first modulating portion, and the first unmodulating portion being opposed to each other in the second direction,
the first modulating portion, the first unmodulating portion, and the polarizer being opposed to each other in the second direction.

2. The optical element according to claim 1 , wherein
a width of the first modulating portion in the first direction is smaller than a width of the first unmodulating portion in the first direction.

3. The optical element according to claim 1 , further comprising:
a first modulating element located between the first liquid crystal lens and the polarizer, and the first modulating element comprising the first modulating portion and the first unmodulating portion,
wherein
the first modulating element further comprises a first substrate, a second substrate, a liquid crystal layer held between the first substrate and the second substrate, and a first control electrode and a second control electrode applying voltages to the liquid crystal layer to form the first modulating portion and the first unmodulating portion.

4. The optical element according to claim 1 , further comprising:
a second liquid crystal lens located on a side opposite to the first liquid crystal lens with respect to the polarizer, formed of liquid crystal molecules, and functioning as a convex lens having a refractive index distribution corresponding to an aligned state of the liquid crystal molecules;
a second modulating portion located between the polarizer and the second liquid crystal lens, and transmitting incident light while rotating a polarization plane; and
a second unmodulating portion adjacent to the second modulating portion between the polarizer and the second liquid crystal lens in the second direction, and transmitting incident light,
wherein
the polarizer, the second modulating portion, the second unmodulating portion, and the second liquid crystal lens are arranged in this order in the second direction,
the second liquid crystal lens, the second modulating portion, and the second unmodulating portion are opposed to each other in the second direction, and
the second modulating portion, the second unmodulating portion, and the polarizer are opposed to each other in the second direction.

5. The optical element according to claim 4 , wherein
a width of the second modulating portion in the first direction is larger than a width of the second unmodulating portion in the first direction.

6. The optical element according to claim 5 , wherein
the width of the second unmodulating portion in the first direction is smaller than the width of the first modulating portion in the first direction.

7. The optical element according to claim 4 , further comprising:
a second modulating element located between the second liquid crystal lens and the polarizer, and the second modulating element comprising the second modulating portion and the second unmodulating portion; and
a controller electrically controlling the first modulating element and the second modulating element,
wherein
the controller changes positions of formation of the first modulating portion and the first unmodulating portion, and changes positions of formation of the second modulating portion and the second unmodulating portion.

8. The optical element according to claim 5 , wherein
each of the first liquid crystal lens, the first modulating portion, the second unmodulating portion, and the second liquid crystal lens extends in a third direction intersecting the first direction and the second direction,
the first modulating portion and the second unmodulating portion overlap in the second direction, and
the first unmodulating portion and the second modulating portion overlap in the second direction.

Assignees

• Japan Display Inc

Inventors

• Nakanishi Takayuki
• Yata Tatsuya
• Koito Takeo

Classifications

• G02F2203/07

  Polarisation dependent · CPC title

• G02F2203/28

  focussing or defocussing · CPC title

• G02F1/1347 Primary

  Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells · CPC title

• G02F1/133553

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• G02F1/13363

  Birefringent elements, e.g. for optical compensation · CPC title