Browse Prior Art Database

LASER PROJECTION DOT MATRIX DISPLAY FOR SMALL FORM FACTOR PAGERS

IP.com Disclosure Number: IPCOM000006636D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-17
Document File: 1 page(s) / 54K

Publishing Venue

Motorola

Related People

Rob Sapashe: AUTHOR

Abstract

As pagers get smaller and take on new and more unique form factors and features the size of the infiir- mation display area becomes limited by the size of the pager. A new way to provide a large projected character size display for a small form factor pager is shown in figures 1 and 2. The display device of this idea can also double as a vibrator.

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MO-LA INC. Technical Developments Volume 17. December 1992

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LASER PROJECTION DOT MATRIX DISPLAY FOR SMALL FORM FACTOR PAGERS

by Rob Sapashe

   As pagers get smaller and take on new and more unique form factors and features the size of the infiir- mation display area becomes limited by the size of the pager. A new way to provide a large projected character size display for a small form factor pager is shown in figures 1 and 2. The display device of this idea can also double as a vibrator.

  As shown in Figure 1 a miniature solid state visible Iight emitting laser diode IC in combination with a rotary reflector wheel is used to produce a projected dot matrix character. Each reflector is angled to project a diierent 5 by 7 dot of the character matrix. A shaft encoder is used to sense wheel position for synchronizing the strobing of the Laser. The motor incorporates a lock mechanism to engage the reflector wheel in one rotary

direction and engage the vibrator counter weight in the other direction. This lock mechanism can also incorpo- rate a cam/ramp mechanism to provide transverse motion to the wheel to align additional sets of reflectors to proj- ect multiple characters.

  When the laser is strobed on during the alignment of the appropriate reflector the corresponding dot is projected as shown in Figure 1. When the strobe speed is above the human visual speed perception threshold fhe dots appear to be continuous thus forming a dot matrix character.

  An alternate arrangeme...