Privacy-enhanced display device
First Claim
Patent Images
1. A method for displaying an a data image only to an authorized user, comprising:
- generating a data image;
generating a mask image, from pixels of the data image, wherein the mask image is a negation of the pixels of the data image;
generating automatically a select signal with a controller;
selecting alternately the data image or the mask image according to the select signal; and
sequentially displaying the selected images on a display device to merge the data image and the mask image into a perceived continuous image to provide a perceived gray image to an unauthorized user while displaying the data image only to an authorized user.
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Accused Products
Abstract
A method displays an image only to an authorized user by generating a mask image from a data image. The data and mask image are then displayed periodically in an alternating manner on a display device by a select signal. The opening end shutting of an optical shutter device is synchronized to the displaying of the selected images so that only the data image is perceived by the authorized user viewing the display device through the optical shutter device, and a gray image is perceived by an unauthorized user viewing the data and mask images directly.
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Citations
33 Claims
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1. A method for displaying an a data image only to an authorized user, comprising:
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generating a data image; generating a mask image, from pixels of the data image, wherein the mask image is a negation of the pixels of the data image; generating automatically a select signal with a controller; selecting alternately the data image or the mask image according to the select signal; and sequentially displaying the selected images on a display device to merge the data image and the mask image into a perceived continuous image to provide a perceived gray image to an unauthorized user while displaying the data image only to an authorized user. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for displaying an a data image only to an authorized user, comprising:
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a video camera generating a data image; an inverter for generating a mask image from pixels of the data image, wherein the mask image is a negation of the pixels of the data image; a controller generating automatically a select signal for selecting alternately the data image or the mask image; and a display device for sequentially displaying selected images as a merged perceived continuous image on a the display device to produce provide a perceived gray image and to an unauthorized user while displaying the data image only to an authorized user. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A method for displaying a data image only to an authorized user, comprising:
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emitting a backlight through at least one polarizer and an optical rotator element to project said data image outwardly from a display; and automatically controlling a modulation of an angle of polarization of the projected data image by controlling said optical rotator element, wherein a substantially uniformly solid color is perceived when viewing the projected data image with an unaided eye and wherein the projected data image is viewable through an optical shutter modulated substantially synchronously with the modulation of the angle of polarization of the projected data image. - View Dependent Claims (27, 28, 33)
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29. An apparatus for displaying a data image only to an authorized user, comprising:
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a backlight; an optical rotator element disposed in front of a polarizer, the optical rotator element modulating an angle of polarization of the data image; the polarizer positioned between said backlight and said optical rotator element, such that light from the backlight passes through the polarizer and the optical rotator element to project the data image outwardly; and a controller configured to automatically control the modulation of the angle of polarization by the optical rotator element such that a substantially uniformly solid color is perceived by an unaided eye. - View Dependent Claims (30, 31, 32)
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Specification