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IP.com Disclosure Number: IPCOM000006119D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Dec-05

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Brad Murray


Current incandescent illumination systems for hand held communication devices (i.e. pagers, cellular phones, etc.) use multiple incandescent lamps to illuminate a display and/or flash lights to alert the user of an event. When illuminating a display, several lamps are used in conjunction with a diffuser to distribute the light more evenly across the display. Even with an efficient diffuser, areas of the display appear substantially brighter than other areas. This can be displeasing to the user and may make reading the display sometimes difficult. This problem can be minimized by adding more lamps but the chances for failures to occur increase proportionally. It would therefore be advantageous to use only one lamp for all the necessary illumination required by a hand held communication device while maintaining or improving the display illumination.