Browse Prior Art Database

DUAL LIQUID CRYSTAL DISPLAY

IP.com Disclosure Number: IPCOM000008959D
Original Publication Date: 1999-Jan-01
Included in the Prior Art Database: 2002-Jul-26
Document File: 3 page(s) / 114K

Publishing Venue

Motorola

Related People

Lim Chin Chuan: AUTHOR [+3]

Abstract

In recent years, customers are demanding for more information to be displayed on portable prod- ucts. In order to display more information, displays such as liquid crystal displays (LCD) need to be larger in size. However, with communication devices becoming more compact and smaller in size and weight, these LCDs will have to be smaller than before. The concept of a dual LCD is aimed at pro- viding more information with small displays.

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MO7WROLA Technical Developments

DUAL LIQUID CRYSTAL DISPLAY

by Lim Chin Chuan, Yin Ying and Benson Saw

  In recent years, customers are demanding for more information to be displayed on portable prod- ucts. In order to display more information, displays such as liquid crystal displays (LCD) need to be larger in size. However, with communication devices becoming more compact and smaller in size and weight, these LCDs will have to be smaller than before. The concept of a dual LCD is aimed at pro- viding more information with small displays.

  This dual LCD will be able to display two sets of graphics. This can bd done by placing one LCD on top of another as shown in Figure 1. Two heat- seal connectors are used to interconnect the two LCDs to a printed circuit board (PCB) as shown in the cross sectional view of Figure 2.

The type of LCD used is a standard Twisted Nematic (TN). Each of the two LCDs requires two

HEATSEAL

"8"

Fig. 1 Exploded View

gl htatorda. Inc. 1999 98 January I999

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MO7VROLA Technical Developments

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polarizers, both perpendicular to each other in orien- tation. In the application of the dual LCD, only three polarizers are needed. The orientation of the three polarizers is shown in Figure 3. When both displays are in an OFF state, light will be able to penetrate all the three polarizers as a result of optical rotation of liquid crystals. A reflector at the back of the bottom LCD wi...