G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/1335 (2006.01) H04N 5/225 (2006.01) H04N 5/238 (2006.01)
Patent
CA 2267843
Described herein is a device for local attenuation of light intensity in the viewing area of a light-sensitive viewing and/or recording device (CCD), this being suitable, in particular, as an anti-glare device for video cameras used in video phones or suitably equipped PC's. The device comprises a first objective (L1) and a point-resolving ferro-electric liquid-crystal modulator (PC, LC) that is arranged between two polarizers (P1, P2), with a photo-conductive layer (PC) and a subsequent liquid-crystal film (LC) that is of helical, smectic liquid crystals that is in contact with this layer. The photo-conductive layer (PC) is located essentially in the image plane of the first objective (L1) that is mapped by a second objective (L2) onto the viewing and/or recording device, when bright light sources or backgrounds are suppressed without any dimming or blooming of the image. By eliminating the intermediate imaging, the viewing and/or recording device (CCD) can, as an alternative, be arranged in the image plane of the first objective (L1), in which case, the second objective (L2) is eliminated. The liquid-crystal modulator (PC, LC) is then arranged in close proximity to and in front of the viewing and/or recording device (CCD), so that bright sources of interfering light are not only made darker, but are also blurred.
Beresnev Leonid
Dultz Wolfgang
Deutsche Telekom Ag
Fetherstonhaugh & Co.
LandOfFree
Device for local attenuation of light intensity in the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for local attenuation of light intensity in the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for local attenuation of light intensity in the... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1722615