Spatial light modulating panel using transmittive liquid crystal display panel and 3D display device using the same

Patent metadata

Field	Value
Publication number	US-9720375-B2
Application number	US-201213679634-A
Country	US
Kind code	B2
Filing date	Nov 16, 2012
Priority date	Nov 16, 2011
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A spatial light modulating panel using a transitive liquid crystal display panel and a three-dimensional display device using the same. A a spatial light modulator including a plurality of pixels arrayed in a matrix manner; and a liquid crystal layer configured to modulate phase of an incident light passing through the each pixel, respectively. The spatial light modulator and the 3D display using the same provides a thin flat type display system having an easy and simple structure and a low manufacturing cost.

First claim

What is claimed is:

1. A spatial light modulating panel device comprising:
a plurality of pixels arrayed in a matrix;
a liquid crystal layer including an electrically controlled birefringence (ECB) mode liquid crystal material and having a constant thickness corresponding to a cell gap;
an upper substrate and a lower substrate defining the pixels arrayed in the matrix and joining each other with the liquid crystal layer therebetween;
an upper electrode disposed at each pixel and formed on an inner side of the upper substrate; and
a lower electrode disposed at each pixel and formed on an inner side of the lower substrate,
wherein the liquid crystal layer is electrically controlled to modulate a phase of an incident light passing through each pixel from 0 to 2π by controlling only a birefringence of the ECB mode liquid crystal material,
wherein two neighboring pixels form a basic unit configured to interfere and produce a three-dimensional (3D) holographic image with phase and amplitude variation, the basic unit producing two phase only modulated lights having different phases, and
wherein a flat lens panel disposed in front of the upper electrode focuses and combines the two phase only modulated lights output by the two neighboring pixels to provide a combined light having a modulated amplitude and a modulated phase.

2. The spatial light modulating panel device according to claim 1 , wherein the incident light is linearly polarized parallel to an initial alignment direction of the liquid crystal layer and propagated to the pixels in a collimated condition.

3. The spatial light modulating panel device according to claim 1 , further comprising:
an eye tracking layer disposed on the upper substrate,
wherein the eye tracking layer is configured to:
detect a changed observer's position;
calculate an optimized viewing angle for the changed observer's position; and
deflect a focal point of the 3D holographic image according to the optimized viewing angle, and

wherein the flat lens panel is disposed between the eye tracking layer and the spatial light modulating panel within the spatial light modulating panel device.

4. The spatial light modulating panel device according to claim 1 , wherein the two neighboring pixels within the basic unit modulate the phase of the incident light differently.

5. A holography 3D (three-dimensional) display comprising:
a back light unit providing a linearly polarized back light to one direction;
a spatial light modulating panel disposed at the one direction, and including a plurality of pixels arrayed in a matrix for phase-modulating of the back light, respectively;
an upper substrate and a lower substrate defining the pixels arrayed in the matrix;
a liquid crystal layer including an electrically controlled birefringence (ECB) mode liquid crystal material and having a constant thickness corresponding to a cell gap, the liquid crystal layer being disposed between the upper substrate and the lower substrate,
wherein the liquid crystal layer is electrically controlled to modulate a phase of the back light passing through each pixel from 0 to 2π by controlling only a birefringence of the ECB mode liquid crystal material;
a flat lens panel disposed at the one direction;
an upper electrode disposed at each pixel and formed on an inner side of the upper substrate; and
a lower electrode disposed at each pixel and formed on an inner side of the lower substrate,
wherein two neighboring pixels form a basic unit configured to interfere and produce a 3D holographic image with phase and amplitude variation, the basic unit producing two phase only modulated lights having different phases,
wherein the flat lens panel disposed in front of the upper electrode focuses and combines the two phase only modulated lights output by the two neighboring pixels to provide a combined light having a modulated amplitude and a modulated phase, and
wherein the spatial light modulating panel is disposed between the flat lens panel and the back light unit within the holography 3D display.

6. The holography 3D display according to claim 5 , wherein the back light is linearly polarized parallel to an initial alignment direction of the liquid crystal layer and propagated to the pixels in a collimated condition from the back light unit.

7. The holography 3D display according to claim 5 , further comprising:
an eye tracking layer disposed on the upper substrate,
wherein the eye tracking layer is configured to:
detect a changed observer's position;
calculate an optimized viewing angle for the changed observer's position; and
deflect a focal point of the 3D holographic image according to the optimized viewing angle, and

wherein the flat lens panel is disposed between the eye tracking layer and the spatial light modulating panel within the holography 3D display.

8. The holography 3D display according to claim 5 , wherein the two neighboring pixels within the basic unit modulate the phase of the phase-modulated back light differently.

Assignees

• Lg Display Co Ltd

Inventors

• Yoon Minsung
• Kim Sunwoo
• Shin Minyoung

Classifications

• G02F1/1393

  the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells (G02F1/1396, G02F1/141 take precedence) · CPC title

• G03H2225/60

  Multiple SLMs · CPC title

• G02B6/001

  the light being emitted along at least a portion of the lateral surface of the fibre · CPC title

• G03H1/2294 Primary

  Addressing the hologram to an active spatial light modulator · CPC title

• G02B27/0093

  with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking · CPC title