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1. WO2020005748 - OPTICAL STACK FOR PRIVACY DISPLAY

Publication Number WO/2020/005748
Publication Date 02.01.2020
International Application No. PCT/US2019/038409
International Filing Date 21.06.2019
IPC
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
21
LIGHTING
V
FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
8
Use of light guides, e.g. fibre optic devices, in lighting devices or systems
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
27
Other optical systems; Other optical apparatus
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
27
Other optical systems; Other optical apparatus
22
for producing stereoscopic or other three-dimensional effects
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01
for the control of the intensity, phase, polarisation or colour
F21V 8/00 (2006.01)
G02B 27/00 (2006.01)
G02B 27/22 (2018.01)
G02F 1/00 (2006.01)
G02F 1/01 (2006.01)
CPC
G02B 6/0038
G02B 6/0055
G02F 1/1323
G02F 1/13338
G02F 1/133504
G02F 1/133528
Applicants
  • REALD SPARK, LLC [US/US]; Suite 400 9777 Wilshire Blvd. Beverly Hills, California 90212, US
Inventors
  • WOODGATE, Graham J.; US
  • HARROLD, Jonathan; US
Agents
  • LOWRY, Penny L.; US
  • MOTHEW, Neil G. J.; US
Priority Data
62/691,89629.06.2018US
62/789,32207.01.2019US
62/796,42324.01.2019US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) OPTICAL STACK FOR PRIVACY DISPLAY
(FR) EMPILEMENT OPTIQUE D'AFFICHAGE DE CONFIDENTIALITÉ
Abstract
(EN)
A switchable privacy display apparatus comprises a polarised output spatial light modulator, and an additional polariser. A reflective polariser, switchable liquid crystal polar control retarder, passive polar control retarders and air gap are arranged between the display output polariser and additional polariser. The passive retarders are arranged to provide no phase difference to polarised light from the spatial light modulator for on-axis light; and simultaneously provide a non-zero phase difference for polarised light in off-axis directions. The polar control retarders are further arranged to achieve low reflectivity for light propagating through the air gap. A switchable privacy display that can be conveniently assembled at low cost can be provided with high contrast images for display users while maintaining high visual security level for off-axis snoopers.
(FR)
Selon la présente invention, un appareil d'affichage de confidentialité commutable comprend un modulateur spatial de lumière à sortie polarisée, et un polariseur supplémentaire. Un polariseur réfléchissant, un retardateur de commande polaire à cristaux liquides commutable, des retardateurs de commande polaire passifs et un entrefer sont disposés entre le polariseur de sortie d'affichage et le polariseur supplémentaire. Les retardateurs passifs sont conçus pour ne fournir aucune différence de phase à la lumière polarisée provenant du modulateur spatial de lumière destinée à une lumière sur axe ; et pour fournir simultanément une différence de phase non nulle destinée à une lumière polarisée dans des directions hors axe. Les retardateurs de commande polaires sont en outre conçus pour permettre une faible réflectivité de la lumière se propageant à travers l'entrefer. Un affichage de confidentialité commutable qui peut être assemblé de manière commode à faible coût peut comporter des images de contraste élevé des utilisateurs d'affichage tout en maintenant un niveau de sécurité visuelle élevé destiné à des informateurs hors-axe.
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