Lighted subway signage
First Claim
1. A method of installing a subway tunnel light box in a subway tunnel for displaying a back-lighted image to a viewer inside of a subway car traveling in the subway tunnel, comprising the steps of:
- choosing a transparent video display that is mounted in the light box;
calculating a perceived horizontal viewing angle for a typical viewing distance of the subway tunnel light box installed at a preselected location in the subway tunnel by a viewer in the subway car based upon a physical height of the transparent video display and a desired aspect ratio of a perceived image for the transparent video display;
determining a number of images to be displayed on the transparent video display with an acceptable horizontal image resolution for each of said perceived images;
positioning a narrow light source in the subway tunnel light box behind each of the displayed images so that each of the displayed images is illuminated by an associated narrow light source with an associated narrow light source horizontal illumination angle substantially the same as the perceived horizontal viewing angle; and
installing the subway tunnel light box at the preselected location.
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Abstract
A subway tunnel light box for displaying a back-lighted image to a viewer inside of a subway car traveling in the subway tunnel in which a transparent video display for displaying a number of images, such as an LCD, is mounted in the light box and a narrow light source, preferably having a width of one pixel, is positioned in the box behind each of the images at a distance less than a typical viewing distance so that each image is illuminated by an associated narrow light source with an associated narrow light source horizontal illumination angle substantially the same as a preselected perceived horizontal viewing angle calculated for the typical viewing distance based upon a physical height of the transparent video display and a desired aspect ratio of a perceived image.
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Citations
25 Claims
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1. A method of installing a subway tunnel light box in a subway tunnel for displaying a back-lighted image to a viewer inside of a subway car traveling in the subway tunnel, comprising the steps of:
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choosing a transparent video display that is mounted in the light box; calculating a perceived horizontal viewing angle for a typical viewing distance of the subway tunnel light box installed at a preselected location in the subway tunnel by a viewer in the subway car based upon a physical height of the transparent video display and a desired aspect ratio of a perceived image for the transparent video display; determining a number of images to be displayed on the transparent video display with an acceptable horizontal image resolution for each of said perceived images; positioning a narrow light source in the subway tunnel light box behind each of the displayed images so that each of the displayed images is illuminated by an associated narrow light source with an associated narrow light source horizontal illumination angle substantially the same as the perceived horizontal viewing angle; and installing the subway tunnel light box at the preselected location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A subway tunnel light box for use in a subway tunnel for displaying a back-lighted image to a viewer inside of a subway car traveling in the subway tunnel, comprising:
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a transparent video display for displaying a number of images that is mounted in the light box; and a narrow light source positioned in the subway tunnel light box behind each of the number of images so that each of said number of images is illuminated by an associated narrow light source with an associated narrow light source horizontal illumination angle substantially the same as a preselected perceived horizontal viewing angle; wherein the preselected perceived horizontal viewing angle is calculated for a typical viewing distance based upon a physical height of the transparent video display and a desired aspect ratio of a perceived image. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification