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Browse Prior Art Database

LCD AIR CUSHION

IP.com Disclosure Number: IPCOM000006154D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Dec-07
Document File: 2 page(s) / 103K

Publishing Venue

Motorola

Related People

Alfred N. Danial: AUTHOR [+2]

Abstract

INTRODUCTION DESCRIPTION The majority of new pager designs are favoring larger LCD areas relative to overall unit size. The larger displays increase the amount of information which can be displayed per screen. The larger LCD surface area is also more susceptible (vulnerable) to damage by drop, and other impacts. Accelerated Life Testing* has shown a marked increase in LCD breakage to these large display products. In order to reduce the occurrence of LCD breakage, the LCD Air Cushion was developed.

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MO7WROLA INC. Technical Developments 'Volume 12 April 1991

LCD AIR CUSHION ~

by Alfred N. Danial and William A. Jacobs

INTRODUCTION DESCRIPTION

  The majority of new pager designs are favoring larger LCD areas relative to overall unit size. The larger displays increase the amount of information which can be displayed per screen. The larger LCD surface area is also more susceptible (vulnerable) to damage by drop, and other impacts. Accelerated Life Testing* has shown a marked increase in LCD breakage to these large display products. In order to reduce the occurrence of LCD breakage, the LCD Air Cushion was developed.

  The LCD Air Cushion is a device that absorbs and diffuses impacts to the LCD. It comprises of placing pressurized air between the protective lens and the LCD of a pager. The1 pressurized air is contained either by sealing compiessed air in the area between the LCD and the lens,, or by placing a transparent, pressurized air bladdei (similar to a small balloon) between the LCD and the lens. Either method is designed to distribute the point load of an impact over the entire surface of the LCD. Such distribution significantly reduces the stress applied to the LCD and enables it to withstand much greater impacts.

'Accclcrated Life Testing is a method of stressing a product ia such a way that its life&me field reliability em be determined in a very short

period of time.

JMPACTS TO DISPLAY AREA

Normal Display Display with LCD Air Cushion

Impacts are transmitted directly to the LCD at the point of contact.

ImpactS are distributed over the entire &face of the LCD and do not actually contact the LCD.

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MO7VROLA INC. Technical Developments Volume 12 April 19...