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1. (WO2012158574) EFFICIENT POLARIZED DIRECTIONAL BACKLIGHT
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2012/158574 International Application No.: PCT/US2012/037677
Publication Date: 22.11.2012 International Filing Date: 12.05.2012
IPC:
G02B 27/26 (2006.01) ,G02F 1/1335 (2006.01) ,G02F 1/13357 (2006.01)
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
26
involving polarising means
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
13
based on liquid crystals, e.g. single liquid crystal display cells
133
Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333
Constructional arrangements
1335
Structural association of optical devices, e.g. polarisers, reflectors, with the cell
[IPC code unknown for ERROR IPC Code incorrect: invalid subgroup (0=>999999)!]
Applicants:
REALD INC. [US/US]; 100 North Crescent Drive, Suite 200 Beverly Hills, CA 90210, US (AllExceptUS)
ROBINSON, Michael, G. [GB/US]; US (UsOnly)
Inventors:
ROBINSON, Michael, G.; US
Agent:
MOTHEW, Neil, G.J.; Baker & McKenzie LLP 2001 Ross Avenue, Suite 2300 Dallas, TX 75201, US
Priority Data:
13/300,29318.11.2011US
61/486,02113.05.2011US
Title (EN) EFFICIENT POLARIZED DIRECTIONAL BACKLIGHT
(FR) RÉTROÉCLAIRAGE DIRECTIONNEL POLARISÉ ET EFFICACE
Abstract:
(EN) By introducing a stack of alternating high and low index dichroic material layers on the exit surface of a waveguide for a wedge type directional backlight, natural reflectivity differences between polarized components can be increased, effectively reflecting the vast proportion of S-polarized light rays, while at the same time transmitting the P-polarized light rays, of light impacting the exit surface of the waveguide at an angle sufficient to exit the waveguide. This recovers polarization in wedge type backlight systems, increasing illumination exiting the waveguide. Also, on the back reflecting surface of the waveguide, a birefringent material can be added to efficiently transform S-polarized reflected light from the dichroic stack, into returning P-polarized light. Because returning rays that are now P-polarized by the birefringent material have already achieved the critical angle for exiting the waveguide, the rays transformed to P-polarization can now also exit the waveguide, increasing waveguide illumination.
(FR) En introduisant un empilement de couches en un matériau dichroïque ayant alternativement un indice élevé et un indice bas sur la surface de sortie d'un guide d'ondes destiné à un rétroéclairage directionnel de type cunéiforme, des différences de réflectivité naturelle entre des composants polarisés peuvent être augmentées, ce qui réfléchit efficacement la majeure partie des rayons lumineux à polarisation S, tout en transmettant simultanément les rayons lumineux à polarisation P, d'une lumière frappant sur la surface de sortie du guide d'ondes à un angle suffisant pour sortir du guide d'ondes. Cela rétablit la polarisation dans les systèmes de rétroéclairage de type cunéiforme, ce qui augmente l'éclairage sortant du guide d'ondes. De plus, il est possible d'ajouter un matériau biréfringent sur la surface rétroréfléchissante du guide d'ondes de façon à transformer efficacement une lumière réfléchie à polarisation S provenant de l'empilement dichroïque en une lumière de retour à polarisation P. Puisque les rayons de retour, qui sont maintenant à polarisation P sous l'action du matériau biréfringent, ont déjà atteint l'angle critique de sortie du guide d'ondes, les rayons transformés à polarisation P peuvent également sortir du guide d'ondes, ce qui augmente l'éclairage du guide d'ondes.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)