System and method for liquid crystal display system incorporating wire grid polarizers for large scale and large volume stereolithography

Patent metadata

Field	Value
Publication number	US-11360348-B2
Application number	US-202017085244-A
Country	US
Kind code	B2
Filing date	Oct 30, 2020
Priority date	Oct 30, 2020
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

The present disclosure relates to a liquid crystal display (LCD) system. The system in one example has a light source for generating unpolarized light, and an LCD screen arranged in a path of transmittance of the unpolarized light. First and second wire grid polarizers are arranged adjacent to the LCD screen and each have a plurality of nano-scale wires, with the first and second wire grid polarizers have differing polarizations. A pitch of each of the nano-scale wires is no larger than one-third a wavelength of the unpolarized light from the light source. The wire grid polarizers create, in connection with operation of the LCD screen, a 2D light mask suitable for initiating the polymerization of an optically curable material.

First claim

What is claimed is:

1. A system for patterning light to at least one of cure an optically curable material or to degrade a portion of optically sensitive material, the system comprising:
a liquid crystal display (LCD);
a light source for generating unpolarized light;
the LCD screen arranged in a path of transmittance of the unpolarized light;
first and second wire grid polarizers arranged adjacent to the LCD screen, on opposing sides of the LCD screen and having differing orientations, for creating, in connection with operation of the LCD screen, a 2D light mask suitable for initiating polymerization of an optically curable material;
the first wire grid polarizer includes a first plurality of nano-scale wires;
the second wire grid polarizer includes a second plurality of nano-scale wires;
wherein a pitch of each of the first and second plurality of nano-scale wires is no larger than one-third of a wavelength of the unpolarized light from the light source;
wherein the first wire grid polarizer forms a first polarizer array, and the second wire grid polarizer forms a second polarizer array, and wherein the first and second polarizer arrays each include a plurality of polarizer sections disposed adjacent to one another in a grid-like layout;
wherein the polarizer sections of the first polarizer array are configured such that the first plurality of nano-scale wires of each said polarizer section are all arranged in a first common orientation to enable the first polarizer array to provide a first polarization to the unpolarized light; and
wherein the polarizer sections of the second polarizer array are configured such that the second plurality of nano-scale wires of each said polarizer section are arranged in a second common orientation to enable the second polarizer array to provide a second polarization which is orthogonal to the first polarization, to light having passed through the LCD screen.

2. The system of claim 1 , wherein:
the first plurality of nano-scale wires is supported on a first substrate disposed adjacent to a first side of the LCD screen; and
the second plurality of nano-scale wires is supported on a second substrate independent of the first substrate, and disposed adjacent to a second side of the LCD screen.

3. The system of claim 1 , wherein each of the first and second pluralities of nano-scale wires comprise metal nano-scale wires.

4. The system of claim 3 , wherein the metal nano-scale wires are fabricated from at least one of iridium, tungsten, silicon, aluminum, or other appropriate materials.

5. The system of claim 1 , wherein:
the first wire grid polarizer comprises a plurality of seams between the polarizer sections thereof; and
the second wire grid polarizer comprises a plurality of seams between the polarizer sections thereof.

6. The system of claim 1 , further comprising movement devices for moving the first and second wire grid polarizers about both the X and Y axes by predetermined X and Y axis distances.

7. The system of claim 6 , wherein the movement devices comprise stepper motors.

8. The system of claim 7 , further comprising a controller for controlling the movement devices.

9. The system of claim 1 , further comprising a controller for controlling the LCD display.

10. The system of claim 7 , wherein the controller further is configured to control the LCD display.

11. A method of generating a patterned, two-dimensional (2D) light field for curing an optically curable material, the method comprising:
using a light source to generate unpolarized light;
using an LCD screen and first and second wire grid polarizer arrays, having a first and second pluralities of nano-scale wires, respectively, to control polarizations of portions of the unpolarized light to create a light mask suitable for initiating polymerization of an optically curable material;
configuring a pitch of each of the first and second plurality of nano-scale wires to be no larger than one-third a wavelength of the unpolarized light from the light source; and
configuring each one of said first and second wire grid polarizer arrays with a plurality of polarizer sections disposed adjacent to one another in a grid-like arrangement, to polarize the unpolarized light from the light source;
further configuring the polarizer sections of the first wire grid polarizer array such that the first plurality of nano-scale wires of each said polarizer section are all arranged in a first common orientation to enable the first wire grid polarizer array to provide a first polarization to the unpolarized light; and
further configuring the polarizer sections of the second wire grid polarizer array such that the second plurality of nano-scale wires of each said polarizer section are arranged in a second common orientation to enable the second wire grid polarizer array to provide a second polarization which is orthogonal to the first polarization, to light having passed through the LCD screen.

12. A liquid crystal display (LCD) system, comprising:
a light source for generating unpolarized light;
a LCD display;
a first wire grid polarizer array arranged adjacent to or on a first surface of the LCD display, and having a first plurality of wire grid polarizer sections each made up of a first plurality of nano-scale wires orientated in a first configuration, for receiving the unpolarized light and creating polarized light having a first polarization;
the LCD display receiving the polarized light having the first polarization and selectively rotating first portions of the polarized light to create second portions of light having a second polarization different from the first polarization;
a second wire grid polarizer array having a second plurality of wire grid polarizer sections arranged adjacent to or on a second surface of the LCD display opposite to the first surface, the second wire grid polarizer array having a second plurality of nano-scale wires operating to allow only light having one of the first polarization or the second polarization to pass therethrough; and wherein the second polarization is orthogonal to the first polarization;
the first plurality of wire grid polarizer sections disposed adjacent to one another to form first seams between the wire grid polarizer sections; and
the second plurality of wire grid polarizer sections disposed adjacent to one another to form second seams between the wire grid polarizer sections; and
movement devices for moving the first and second wire grid polarizer arrays about both X and Y axes by predetermined X and Y axis distances in relation to the first and second seams.

13. The system of claim 12 , wherein the nano-scale wires of each one of the first and second pluralities of nano-scale wires have a pitch selected to be no larger than one third of a wavelength of the unpolarized light generated by the light source.

14. The system of claim 12 , wherein:
the first wire grid polarizer array includes a first substrate on which the first plurality of nano-scale wires of each one of the first plurality of wire grid polarizer sections is supported; and
the second wire grid polarizer array includes a second substrate on which the second plurality of nano-scale wires of each one of the second plurality of wire grid polarizer sections is supported.

15. The system of claim 12 , wherein the first wire grid polarizer array includes a first substrate, and the second wire grid polarizer array includes a second substrate, and wherein at least one of the first and second substrates comprises at least one of PET, fused silica, or glass.

16. The system of claim 12

Assignees

• L Livermore Nat Security Llc
• Univ Texas

Inventors

• Duoss Eric B
• Oakdale James
• Rodriguez Nicholas Anthony
• Song Hongtao
• Crawford Richard
• Seepersad Carolyn
• Chen Morgan

Classifications

• B22F1/0547

  Nanofibres or nanotubes · CPC title

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02F1/133531

  characterised by the arrangement of polariser or analyser axes · CPC title

• B29C64/286 Primary

  Optical filters, e.g. masks · CPC title

• G03F7/2057

  using an addressed light valve, e.g. a liquid crystal device · CPC title