Beam deflection layer and 3-dimensional display device including the same

Patent metadata

Field	Value
Publication number	US-12095974-B2
Application number	US-202117201868-A
Country	US
Kind code	B2
Filing date	Mar 15, 2021
Priority date	May 11, 2020
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

A beam deflection layer includes: a first selective polarization conversion-splitter that splits first color light in an incident light beam into 1A color light and 1B color light having different polarization directions from each other; a first beam deflector that deflects the 1A first first color light in the light beam from the 1A first selective polarization conversion-splitter, a first selective polarization converter that converts polarization directions of the 1A first first color light and the 1B second first color light in the light beam from the 1A first beam deflector, and a 1B second beam deflector configured to deflect the 1B second first color light in the light beam from the first selective polarization converter. The first color light, the 1A color light, and the 1B color light each have a first wavelength band.

First claim

What is claimed is:

1. A beam deflection layer comprising:
a first selective polarization conversion-splitter comprising at least one of a first optically anisotropic polymer or a first inorganic material having wavelength selectivity with respect to first color light, the first selective polarization conversion-splitter configured to:
receive an incident light beam comprising the first color light, second color light and third color light, the incident light beam propagating in a first direction from a light source, and
selectively split the first color light in the incident light beam into first color light of first polarization and first color light of second polarization based on the at least one of the first optically anisotropic polymer or the first inorganic material, the first color light of the first polarization having a polarization direction different from the first color light of the second polarization;

a first beam deflector provided in front of the first selective polarization conversion-splitter in the first direction, the first beam deflector comprising one or more first liquid crystal layers, and the one or more first liquid crystal layers configured to:
deflect the first color light of the first polarization from the first selective polarization conversion-splitter in a second direction different from the first direction to output deflected first color light of the first polarization, and
allow the first color light of the second polarization pass through the one or more first liquid crystal layers without deflection;

a first selective polarization converter provided in front of the first beam deflector in the first direction, and comprising at least one of a second optically anisotropic polymer or a second inorganic material having wavelength selectivity with respect to the first color light, the first selective polarization converter configured to convert polarization directions of the deflected first color light of the first polarization and the first color light of the second polarization without deflection from the first beam deflector by the at least one of the second optically anisotropic polymer or the second inorganic material;
a second beam deflector provided in front of the first selective polarization converter in the first direction and comprising one or more second liquid crystal layers, the one or more second liquid crystal layers configured to:
deflect the first color light of the second polarization from the first selective polarization converter in a third direction different from the first direction to output deflected first color light of the second polarization, and
allow the deflected first color light of the first polarization to pass through the one or more second liquid crystal layers without deflection;

a second selective polarization conversion-splitter configured to:
split the deflected first color light of the first polarization from the second beam deflector into first color light of the first polarization deflected in the second direction and first color light of the second polarization deflected in the second direction, and
split the deflected first color light of the second polarization from the second beam deflector into first color light of the first polarization deflected in the third direction and first color light of the second polarization deflected in the third direction; and

a first polarizer configured to transmit light having one polarization direction among the first color light of the first polarization deflected in the second direction, the first color light of the second polarization deflected in the second direction, the first color light of the first polarization deflected in the third direction and the first color light of the second polarization deflected in the third direction from the second selective polarization conversion-splitter,
wherein each of the first color light, the first color light of the first polarization, and the first color light of the second polarization is in a first wavelength band,
wherein the second color light and the third color light sequentially pass through the first selective polarization conversion-splitter, the first beam deflector, the first selective polarization converter, the second beam deflector, the second selective polarization conversion-splitter and the first polarizer without deflection and polarization conversion,
wherein the beam deflection layer is a multi-level structure comprising a plurality of levels,
wherein the first selective polarization conversion-splitter, the first beam deflector, the first selective polarization converter, the second beam deflector, the second selective polarization conversion-splitter and the first polarizer are sequentially arranged as one of the plurality of levels of the multi-level structure, and
wherein the first color light, the second color light and the third color light simultaneously pass through each of the first selective polarization conversion-splitter, the first beam deflector, the first selective polarization converter, the second beam deflector, the second selective polarization conversion-splitter and the first polarizer for the first color light of the first polarization deflected in the second direction, the first color light of the first polarization deflected in the third direction, the second color light without deflection and polarization conversion and the third color light without deflection and polarization conversion to be output from the first polarizer.

2. The beam deflection layer of claim 1 , wherein the first selective polarization conversion-splitter is further configured to rotate the polarization direction of the first color light by 45 degrees.

3. The beam deflection layer of claim 1 , wherein the first beam deflector comprises:
a first horizontal deflector configured to horizontally deflect the first color light of the first polarization from the first selective polarization conversion-splitter to output horizontally deflected first color light of the first polarization;
a first general-purpose polarization converter configured to convert a polarization direction of the horizontally deflected first color light of the first polarization from the first horizontal deflector; and
a first vertical deflector configured to vertically deflect the horizontally deflected first color light of the first polarization from the first general-purpose polarization converter.

4. The beam deflection layer of claim 1 , wherein the first selective polarization converter is further configured to rotate polarization directions of the deflected first color light of the first polarization and the first color light of the second polarization from the first beam deflector by 90 degrees.

5. The beam deflection layer of claim 1 , wherein the second beam deflector comprises:
a second vertical deflector configured to vertically deflect the first color light of the second polarization from the first selective polarization converter to output vertically deflected first color light of the second polarization;
a second general-purpose polarization converter configured to convert a polarization direction of the vertically deflected first color light of the second polarization from the second vertical deflector; and
a second horizontal configured to horizontally deflect the vertically deflected first color light of the second polarization from the second general-purpose polarization converter.

6. The beam deflection layer of claim 1 , wherein the second selective polarization conversion-splitter is further configured to rotate the polarization directions of the first color light of the first polarization and the first color light of the second polarization from the second beam deflector by 45 degrees.

7. The b

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Young
• An Jungkwuen
• Won Kanghee
• Hong Jong-Young

Classifications

• H04N2213/001

  Constructional or mechanical details · CPC title

• H04N13/324

  Colour aspects · CPC title

• G02B5/18

  Diffraction gratings {(holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44)} · CPC title

• G02B5/3041

  comprising multiple thin layers, e.g. multilayer stacks · CPC title

• G02F2203/07

  Polarisation dependent · CPC title