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Alignment Method between Tape Carrier Packaged Driver IC and Liquid Crystal Display Glass Panel

IP.com Disclosure Number: IPCOM000114273D
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Ogawa, H: AUTHOR [+3]

Abstract

This article describes an effective alignment method between Tape Carrier Packaged (TCP) driver IC and Liquid Crystal Display (LCD) glass panel. The method does not require special alignment marks on both sides of the circuit, which are normally designed in the opening area among TCP's and results in reducing TCP patterning space, because they are designed into the common electrical circuit. As a result, higher density LCD driver circuit design is possible.

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This is the abbreviated version, containing approximately 100% of the total text.

Alignment Method between Tape Carrier Packaged Driver IC and Liquid
Crystal Display Glass Panel

      This article describes an effective alignment method between
Tape Carrier Packaged (TCP) driver IC and Liquid Crystal Display
(LCD) glass panel.  The method does not require special alignment
marks on both sides of the circuit, which are normally designed in
the opening area among TCP's and results in reducing TCP patterning
space, because they are designed into the common electrical circuit.
As a result, higher density LCD driver circuit design is possible.

      LCD and TCP driver IC placement schematic is shown in Fig. 1.
LCD glass pattern (1) and TCP driver IC pattern (2) is matched by
three direction elements, X / Y / Theta,.  Post alignment pattern (3)
is also shown.  Each direction's gap is measured and calculated by
dimensions (4) and (5) in Fig. 2.

      In addition, the method provides that automatic placement
offset value control is possible by post placement gap data
processing.  The flow is shown in Fig. 3.  As a result,
miss-placement ratio will be reduced.