Liquid crystal lens and 3D display device

Patent metadata

Field	Value
Publication number	US-10353238-B2
Application number	US-201615107924-A
Country	US
Kind code	B2
Filing date	Apr 28, 2016
Priority date	Apr 8, 2016
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

The present invention provides a liquid crystal lens and a 3D display device. By utilizing the metal wire grid ( 20 ) to realize the functions of electrode and polarizer at the same time, and the polarizer filters the o light to solve the display degradation issue due to the o light leakage, and corresponding high quality 3D image display is realized. By combining function of the polarizer and the electrode in the metal wire grid ( 20 ), the additional polarizer adhesion is no longer required, which can effectively decrease the thickness of the liquid crystal lens. The present invention further provides a 3D display device, which can decrease the thickness of the 3D display device to realize the high quality 3D image display.

First claim

What is claimed is:

1. A liquid crystal lens, comprising: an upper glass substrate, a lower glass substrate, which is oppositely located to the upper glass substrate, a metal wire grid located on one side of the upper glass substrate close to the lower glass substrate, a plurality of strip electrodes which are in parallel spaced arrangement on one side of the lower glass substrate close to the upper glass substrate, and a liquid crystal layer located between the lower glass substrate and the upper glass substrate;
wherein the metal wire grid comprises a plurality of metal wires which are in parallel spaced arrangement, and a dielectric layer located under the plurality of metal wires which are in parallel spaced arrangement and on the upper glass substrate;
an extension direction of the plurality of metal wires is perpendicular with a polarization direction of incident light of the liquid crystal lens, and an extension direction of the plurality of strip electrodes is different from either one of the polarization direction of the incident light of the liquid crystal lens and the extension direction of the plurality of metal wires, and a refractivity of the liquid crystal layer gradually decreases from middle to border of the liquid crystal layer to form a lens effect to focus an incident light to be focused to a predetermined direction and to filter an ordinary light generated by incident light due to birefraction by the metal wire grid; and
the metal wire grid possesses functions of electrode and polarizer at the same time, wherein the metal wires of the metal wire grid functions as an electrode that receives application of a voltage between the metal wire grid and the plurality of strip electrodes to re-direct the incident light to transmit through the liquid crystal between the metal wire grid and the strip electrodes and functions as a polarizer to polarize the re-directed light that transmits through the liquid crystal between the metal wire grid and the strip electrodes.

2. The liquid crystal lens according to claim 1 , wherein a period of the metal wire grid is from 20 nanometer to 500 nanometer, and a duty ratio is from 0.1 to 0.9.

3. The liquid crystal lens according to claim 1 , wherein a width of the strip electrode is 10-1000 μm.

4. The liquid crystal lens according to claim 1 , wherein a material of the metal wire grid is aluminum, silver or gold.

5. The liquid crystal lens according to claim 1 , wherein a material of the dielectric layer is silicon dioxide, silicon monoxide, magnesium oxide, silicon nitride, titanium dioxide or tantalum pentoxide.

6. The liquid crystal lens according to claim 1 , wherein the voltage applied between the metal wire grid and the plurality of strip electrodes is different among the metal wires of the metal wire grid.

7. A 3D display device, comprising a display panel, a display panel polarizer located on the display panel, and a liquid crystal lens located on the display panel polarizer;
wherein the liquid crystal lens comprises: an upper glass substrate, a lower glass substrate, which is oppositely located to the upper glass substrate, a metal wire grid located on one side of the upper glass substrate close to the lower glass substrate, a plurality of strip electrodes which are in parallel spaced arrangement on one side of the lower glass substrate close to the upper glass substrate, and liquid crystal layer located between the lower glass substrate and the upper glass substrate;
the metal wire grid comprises a plurality of metal wires which are in parallel spaced arrangement, and dielectric layer located under the plurality of metal wires which are in parallel spaced arrangement and on the upper glass substrate;
an extension direction of the plurality of metal wires is perpendicular with a polarization direction of incident light of the display panel polarizer, and an extension direction of the plurality of strip electrodes is different from either one of the polarization direction of the display panel polarizer and the extension direction of the plurality of metal wires, and a refractivity of the liquid crystal layer gradually decreases from middle to border of the liquid crystal layer to form a lens effect to focus an incident light to be focused to a predetermined direction and to filter an ordinary light generated by incident light due to birefraction by the metal wire grid; and
the metal wire grid possesses functions of electrode and polarizer at the same time, wherein the metal wires of the metal wire grid functions as an electrode that receives application of a voltage between the metal wire grid and the plurality of strip electrodes to re-direct the incident light to transmit through the liquid crystal between the metal wire grid and the strip electrodes and functions as a polarizer to polarize the re-directed light that transmits through he liquid crystal between the metal wire grid and the strip electrodes.

8. The 3D display device according to claim 7 , wherein the display panel is an OLED display panel, or a LCD display panel.

9. The 3D display device according to claim 7 , wherein the display panel polarizer is an absorption type polarizer.

10. The 3D display device according to claim 7 , wherein a period of the metal wire grid is from 20 nanometer to 500 nanometer, and a duty ratio is from 0.1 to 0.9;
a material of the metal wire grid is aluminum, silver or gold; and
a material of the dielectric layer is silicon dioxide, silicon monoxide, magnesium oxide, silicon nitride, titanium dioxide or tantalum pentoxide.

11. The 3D display according to claim 7 , wherein a width of the strip electrode is 10-1000 μm.

12. The 3D display device according to claim 7 , wherein the voltage applied between the metal wire grid and the plurality of strip electrodes is different among the metal wires of the metal wire grid.

13. A liquid crystal lens, comprising: an upper glass substrate, a lower glass substrate, which is oppositely located to the upper glass substrate, a metal wire grid located on one side of the upper glass substrate close to the lower glass substrate, a plurality of strip electrodes which are in parallel spaced arrangement on one side of the lower glass substrate close to the upper glass substrate, and a liquid crystal layer located between the lower glass substrate and the upper glass substrate;
wherein the metal wire grid comprises a plurality of metal wires which are in parallel spaced arrangement, and a dielectric layer located under the plurality of metal wires which are in parallel spaced arrangement and on the upper glass substrate;
an extension direction of the plurality of metal wires is perpendicular with a polarization direction of incident light of the liquid crystal lens, and an extension direction of the plurality of strip electrodes is different from either one of the polarization direction of the incident light of the liquid crystal lens and the extension direction of the plurality of metal wires, and a refractivity of the liquid crystal layer gradually decreases from middle to border of the liquid crystal layer to form a lens effect to focus an incident light to be focused to a predetermined direction and to filter an ordinary light generated by incident light due to birefraction by the metal wire grid; and
the metal wire grid possesses functions of electrode and polarizer at the same time, wherein the metal wires of the metal wire grid functions as an electrode that receives application of a voltage between the metal wire grid and the plurality of strip electrodes to re-direct the incident light to transmit through the liquid crystal between the metal wire grid and the strip electrodes and

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

• Zha Guowei

Classifications

• G02B30/25

  using polarisation techniques · CPC title

• G02F1/133526

  Lenses, e.g. microlenses or Fresnel lenses · CPC title

• G02F1/133528 Primary

  Polarisers · CPC title

• G02B5/3058

  comprising electrically conductive elements, e.g. wire grids, conductive particles · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title