| 摘要 |
An improved address display device that can automatically adjust its light output intensity to ambient light conditions and is readily changeable to any address. The device can be remotely turned on by either a bright light or radio signal from an emergency vehicle. An LED 7-segment display with numerals and letters, 7-segment lamp tubes, a dot-matrix LED, electric bulbs or tubes, or any other display means produces a display visible and readable to a person with normal vision at a distance of exceeding 50 feet and preferably over 100 feet both day and night. A photocell or other ambient light sensing device automatically adjusts intensity for various ambient conditions such as bright sunlight, night, fog, or other conditions. The device contains a circuit that allows immediate adjustment or change of the address. There are at least two embodiments of this feature: 1) the ability to set each digit with switches, and 2) a counter circuit that causes the address to count when a button is depressed. The second embodiment can contain a slow/fast switch to control the counting speed.
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