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Multiple Output Function Circuit for an Electronic Watch

IP.com Disclosure Number: IPCOM000079900D
Original Publication Date: 1973-Sep-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Ainsworth, RA: AUTHOR [+2]

Abstract

This concerns the multiple use of display elements, such as liquid crystal segments, in an electronic watch. The display elements normally show hour and minutes. With the present circuit, however, by holding down a single pushbutton, the display will show the date for four seconds and then the real-time seconds. When the pushbutton is released, the hour and minutes reappear.

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Multiple Output Function Circuit for an Electronic Watch

This concerns the multiple use of display elements, such as liquid crystal segments, in an electronic watch. The display elements normally show hour and minutes. With the present circuit, however, by holding down a single pushbutton, the display will show the date for four seconds and then the real-time seconds. When the pushbutton is released, the hour and minutes reappear.

As shown in the figure, the circuitry comprises a standard oscillator 81 and DIVIDERS 82, 86, 90 and 94 which drive display indicators 84, 88, 92 and 96, respectively. The outputs of the SECONDS, MINUTES, HOURS and DAY indicators pass over lines 85, 89, 93 and 97 to AND gate circuits 110, 111, 112 and 113, respectively, and through OR circuit 115 to display 117 which may comprise a standard liquid crystal segmented display.

With mechanical switch 5 in the normally closed (NC) position, the output from bounce eliminator 80 to the SET line is down and the RESET line is up, thereby operating AND gates 110 and 111 to cause the minutes and hours to he impressed on display 117.

Upon actuation of pushbutton 5 to the normally open (NO) position, the SET line goes positive. At this point, the output from inverter 103 is positive; thus AND gate 113 is operated by positive inputs from the SET line, line 105 and line 97, to give an indication of the date on display 117.

The SET signal also activates gate 98 to operate counter 100. Counter 100 gener...