Browse Prior Art Database

IMPROVED INTERNAL LCD INTERCONNECTION

IP.com Disclosure Number: IPCOM000006206D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2001-Dec-13
Document File: 2 page(s) / 81K

Publishing Venue

Motorola

Related People

Habib Amirzadeh: AUTHOR [+2]

Abstract

The current technology defining dot matrix liquid crystal displays calls for a grid-like pattern ('matrix') of dots ('segments') which can be darkened by the application of a voltage across them. The darkening is caused by the liquid crystal material and the voltage is developed as transparent conductive traces above and below the liquid crystal material change their relative voltage. The intersection of an orthogonal pattern of these conductive traces determines the position of the segments, and, thus, the position of the display charac- ters. A typical character is made from a matrix of seg- ments 7 rows by 5 columns. Future miniature elec- tronic products will require increasingly complex displays, with current requests for a 2 line thereby requiring 14 (2 lines x 8 rows per line) horizontal con- ductive traces.

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0 M MOm0l.A

INC. Technical Developments Volume 13 July 1991

IMPROVED INTERNAL LCD INTERCONNECTION

by Habib Amirzadeh and Larry Marvet

  The current technology defining dot matrix liquid crystal displays calls for a grid-like pattern ('matrix') of dots ('segments') which can be darkened by the

application of a voltage across them. The darkening is caused by the liquid crystal material and the voltage is developed as transparent conductive traces above and below the liquid crystal material change their relative voltage. The intersection of an orthogonal pattern of these conductive traces determines the position of the segments, and, thus, the position of the display charac- ters. A typical character is made from a matrix of seg- ments 7 rows by 5 columns. Future miniature elec- tronic products will require increasingly complex displays, with current requests for a 2 line thereby requiring 14 (2 lines x 8 rows per line) horizontal con- ductive traces.

  Multiplexing is often incorporated to reduce the number of necessary circuits. In the case of the afore- mentioned display example, the 14 horizontal ground conductors are divided into 2 groups through l/8 mul- tiplexing, yielding a total of 8 distinct circuits (Figure 1 & 2). Consequently, each circuit has an equivalent circuit in the other group. The usual design practice dictates that every circuit, equivalent or not, be inter- connected between the LCD and the driver board, and

only on the driver board:combined into 1 conductor. This disc...