Browse Prior Art Database

AUTOMATIC READ MODE TEMPERATURE COMPENSATOR

IP.com Disclosure Number: IPCOM000007493D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2002-Apr-01
Document File: 1 page(s) / 56K

Publishing Venue

Motorola

Related People

Frank Falcone: AUTHOR [+3]

Abstract

The new generation of Motorola Alpha-numeric products support dual message display mode. The first is a line by line mode that displays a message one screen at a time. The second is a scroll mode that displays the message by scrolling it across the screen one column at at time. In cold temperatures (below 0 degrees C), the message becomes unread- able when the scroll mode is selected due to the slow response time of the LCD display in low tem- perature environments. The message is fully read- able in line-by-line mode at -10 degrees C (pagers operating range spec) since the data on the display remains on screen for the duration of the screen time-out which makes LCD response time negligible.

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MOlVROLA Technical Developments

AUTOMATIC READ MODE TEMPERATURE COMPENSATOR

by Frank Falcone, Eugene Lopatukhin and Greg Coonley

ABSTRACT

tion as a whole.

IMPLEMENTATION

  The new generation of Motorola Alpha-numeric products support dual message display mode. The first is a line by line mode that displays a message one screen at a time. The second is a scroll mode that displays the message by scrolling it across the screen one column at at time. In cold temperatures (below 0 degrees C), the message becomes unread- able when the scroll mode is selected due to the slow response time of the LCD display in low tem- perature environments. The message is fully read- able in line-by-line mode at -10 degrees C (pagers operating range spec) since the data on the display remains on screen for the duration of the screen time-out which makes LCD response time negligible.

  The intention of the feature described here is to eliminate the problem that can be experienced in cold environments when message scrolling display mode is used. Users experiencing this problem would believe the pager is malfunctioning. Furthermore, this may also raise doubts about the pager's opera-

  This feature will be implemented in software and with the use of a thermo-sensor to determine the temperature threshold where mode switching will occur (Figure 1). Before displaying a page, the microprocessor will energize the thermo-sensor using a port line. It will then determine whether to deac- tivate the scr...