Active Matrix Liquid-Crystal Displays for TV and Office Systems


MATRIX-LCD - 2283

Keywords flat-panel displays, liquid crystal displays, HDTV


Start Date: 01-FEB-89 / Duration: 41 months

[ contact / participants ]


Objectives and Approach

For a long time Europe has held a distinguished record in developing and fabricating liquid crystal materials. Today, the three companies Merck (D), BDH (UK) and Hoffman La Roche (CH) almost control the entire world market for these materials. Nevertheless, the European position on LC devices, components and sub-assemblies for panels is less favourable, and Japanese suppliers dominate the global market, with large sales in Europe.

There are, however, a number of European companies with the technical capabilities to produce LCDs and to compete worldwide, provided that production investments are made on an appropriate scale for a well-defined technology.

Investigation of the different technological requirements for the production of a large complex flat-panel display has been completed.

The approach, which is now widely recognised as the most promising, is to deposit a matrix of switching transistors on an inner wall of the LCD (AMLCD). Three of the partners have demonstrated their technical know-how in the field of active matrix panels by the realisation, at the laboratory level, of displays with viewing areas of approximately 10x10 cm{2} and resolution up to 256x256 pixels (see project 833).

Although applications for such displays are expected in small portable equipment and video projectors, it seems necessary to develop larger (A4) high-resolution panels to meet the key requirements of office terminals. The main goal of the project is therefore to validate technologies for the production of active matrix LCDs up to A4 in size.

The work involved the preparation of direct-view flat-panel displays using amorphous silicon with external IC drivers in the short term, or using polycrystalline silicon with integrated drivers as an alternative in the longer term.

Progress and Results

The realisation of an A4 amorphous silicon matrix has been carried out, and, in parallel, a polycrystalline silicon process for integrated drivers and A4 glass compatibility has been developed (6" diagonal demonstrator).

A complete new facility dedicated to the realisation of 14" x 14" substrate displays has been built by Thomson LCD near Grenoble, and is already experiencing problems arising from amorphous silicon display production in a pilot line. A5 eight-colour displays have been demonstrated as a first step towards the final goal.

The consortium has demonstrated a 2.8" diagonal active-matrix LCD display with fully integrated polysilicon row and column drivers: the device contains a 200 x 200 pixel array, and can be driven through a 28-pin connector.


CONTACT POINT

Dr J. Magarino
THOMSON-LCD
ZI Centre Alp
F - 38430 Moirans
tel: + 33/ 768-61019
fax:: + 33/ 768-61010
telex: 204780F

Participants

THOMSON-LCD - F - C
AEG-DAIMLER BENZ - D - P
IMEC VZW - B - P
THOMSON CONSUMER ELECTRONICS - F - P
DEUTSCHE THOMSON-BRANDT GMBH - D - P
GEC PLC - UK - P
THOMSON CETIA - F - A
ARISTOTELES UNIVERSITY OF
THESSALONIKI - GR - A
RYTRAK LTD - UK - A


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MATRIX-LCD - 2283, December 1993


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html version of synopsis by Nick Cook