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Browse Prior Art Database

Tab Design which can Minimize Thermal Expansion or Compression

IP.com Disclosure Number: IPCOM000115698D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Onodera, T: AUTHOR [+2]

Abstract

As shown in Fig. 1, Liquid Crystal Display (LCD) module is composed of a cell, cards and Tape Automated Bonding (TABs). TAB is usually connected with the cell by heat press and is connected with the card by soldering. Since the cell, the card and the TAB are made of different materials which have different rate of expansions respectively, they are crooked warp at the joined portion. Therefore, crack is especially appeared on the joined portion by soldering.

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Tab Design which can Minimize Thermal Expansion or Compression

      As shown in Fig. 1, Liquid Crystal Display (LCD) module is
composed of a cell, cards and Tape Automated Bonding (TABs).  TAB is
usually connected with the cell by heat press and is connected with
the card by soldering.  Since the cell, the card and the TAB are made
of different materials which have different rate of expansions
respectively, they are crooked warp at the joined portion.
Therefore,
crack is especially appeared on the joined portion by soldering.

      Fig. 2 (a) shows a conventional shape of TAB.  The long
soldering area which has a distance "a" is formed in the TAB so as to
be along the length of the card.  Fig. 2 (b) shows the improved shape
of TAB.  The short soldering area which has distance "b" is formed in
the TAB so as to be perpendicular to the length of the card.  Since
the distance "b" is shorter than distance "a" of the soldering area,
the improved shape of TAB can prevent the soldering area from
cracking.

      Fig. 3 shows the improved TAB mounted between the card and the
cell.