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Static system is a preventive tool that protects the public computer display without any dynamic alterations to the video stream itself. For instance, a security screen that prevents any users who are not on the right angle to see the display is a static system. Another example of the static system
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The major advantage of the shutter glass system was that it allowed the same display to be used for multiple unrelated images, one of which was visible without any glasses at all. Unfortunately, the contrast ratio of the public image is only 1/2 the available contrast ratio of the CRT when driven
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A secondary issue was that although the image was privacy-enhanced, it was not secure. The secret image appeared as a "ghost" if one moved one's head rapidly - or struck the viewer's head with a soft object, thereby offsetting the two image fields and revealing the edges of the difference image.
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A final issue is the decline of the CRT and the rise of the LCD in display technology, because nearly all LCDs are too slow to support the 120 Hz or faster refresh rate needed for this privacy enhancement to work. Meanwhile, lenticular monitor filters have diminished the need for the
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Privacy-enhanced computer display technology utilizes a public display image ( denoted Pij for the pixel value at location i,j in the public image), a secret display image (Sij, similarly denoted for pixel value at pixel location i,j ), a proprietary device driver, a
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With the rapid growth of handheld phones with integrated digital cameras (and fast shutters) the phone's camera video will often reveal alternating frames of the public and secret images. This effectively breaks the privacy capability of the system.
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is the front polarizer of the LCD screen. Such polarizer is removed when the computer display is in "secure use". The authorized users who have access to the confidential information need to wear a polarized sunglasses to see the screen.
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blurs the two images into , which reduces to (Pij / 2), which is the public image, effectively preventing an unintended recipient from viewing the secret image.
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The patent was sold in 2010 to
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72:(up to 120 Hz) and a set of synchronized ferroelectric shutter glasses. The device driver causes the
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Yerazunis, William S.; Carbone, Marco (2001). "Privacy-enhanced displays by time-masking images".
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to alternately display the pixelwise difference (Pij – Sij) and the unaltered secret image (Sij).
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The intended recipient, wearing the synchronized glasses, will see only the (Sij) secret image.
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Prior to the invention of privacy-enhanced computer display by the
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When viewed directly without the shutter glasses, the human eye's
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allows information that must remain private to be viewed on
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159:. Merl.com. 2001-08-02
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485:SERVIS-2
432:Camellia
364:(25.05%)
673:Commons
437:CC-Link
420:Current
389:Defunct
353:Powerex
343:Current
313:Diatone
302:Defunct
277:Iconics
267:Current
43:History
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520:MELCOM
465:MISTY1
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535:Trium
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375:(20%)
356:(50%)
130:Sales
648:Sold
504:Past
20:, a
66:CRT
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