Browse Prior Art Database

DISPLAY ASSEMBLY RETENTION WITH SPRING/DAMPER FEATURE

IP.com Disclosure Number: IPCOM000006492D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2002-Jan-09
Document File: 1 page(s) / 66K

Publishing Venue

Motorola

Related People

Clifford Anderson: AUTHOR [+3]

Abstract

Breakage of glass Liquid Crystal Displays (LCDs) in portable communications products, including pagers, is one of the limiting factors in a product's drop test performance. Thus, the design of the mounting system for the glass in the pager directly impacts a pager's drop test performance. Typically, the back of the LCD is supported by slots in the plastic housing on the ends of the glass, or by a rigid member along the length of the glass, sometimes with a rubber sheet in between the glass and the rigid member. These configurations have been designed to reduce the shock transmitted to the glass during drop. For example, the rubber durometer and thickness are selected to absorb shock energy. How- ever, there are limitations to drop performance with this technology.

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MOTOROLA INC. Technical Developments Volume 16 August 1992

DISPLAY ASSEMBLY RETENTION WITH SPRING/DAMPER FEATURE

by Clifford Anderson, Stefan Peana and Dwight D. Brooks

  Breakage of glass Liquid Crystal Displays (LCDs) in portable communications products, including pagers, is one of the limiting factors in a product's drop test performance. Thus, the design of the mounting system for the glass in the pager directly impacts a pager's drop test performance. Typically, the back of the LCD is supported by slots in the plastic housing on the ends of the glass, or by a rigid member along the length of the glass, sometimes with a rubber sheet in between the glass and the rigid member. These configurations have been designed to reduce the shock transmitted to the glass during drop. For example, the rubber durometer and thickness are selected to absorb shock energy. How- ever, there are limitations to drop performance with this technology.

  A method of improving the shock performance when mounting an LCD display is described below. The existing support construction is modified to allow a cer- tain amount of deflection under inertial loadiig. In par- ticular, the plastic housing serves to retain the LCD as

well as dampen its motion. For example, a supporting member may be molded into the back cover of Figure
1. The supporting member is stiff enough to keep the LCD in position during normal operation, for example when the LCD is pushed from the outside of the pager. Howev...