Silicon-based reflective polymer-dispersed LC display for portable low-power applications

Geert P. S. Van Doorselaer; Nadine Carchon; Jean Van den Steen; Dieter Cuypers; Jan M.A. Vanfleteren; Herbert De Smet; Andre Van Calster

doi:10.1117/12.343860

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26 March 1999 Silicon-based reflective polymer-dispersed LC display for portable low-power applications

Geert P. S. Van Doorselaer, Nadine Carchon, Jean Van den Steen, Dieter Cuypers, Jan M.A. Vanfleteren, Herbert De Smet, Andre Van Calster

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Proceedings Volume 3635, Liquid Crystal Materials, Devices, and Applications VII; (1999) https://doi.org/10.1117/12.343860
Event: Electronic Imaging '99, 1999, San Jose, CA, United States

Abstract

Recently LCOS microdisplays are becoming available for personal IT applications, despite some problems which are less critical in poly silicon or amorphous silicon based displays. The most common problems which must be encountered are the polarization of the pixels and the light shielding of the silicon substrate. In this paper a methods proposed which solves the light shielding and pixel flatness problem. A non-critical back-end processing which can be applied outside the silicon foundry has been developed. The effectiveness of the light shielding on a working demonstrator display is shown. To avoid light losses caused by a polarization filter, a polymer dispersed LC has been chosen. By decreasing the cell gap we made the PDLC voltage compatible with a standard 3 micrometers CMOS process and its response fast enough to be used for video applications. It is shown that this choice is very suited in direct view and portable applications. The realized prototype has 3 bit grey levels and is video compatible and can be used in a number of applications, such as personal viewers, PDAs and data displays.

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Geert P. S. Van Doorselaer, Nadine Carchon, Jean Van den Steen, Dieter Cuypers, Jan M.A. Vanfleteren, Herbert De Smet, and Andre Van Calster "Silicon-based reflective polymer-dispersed LC display for portable low-power applications", Proc. SPIE 3635, Liquid Crystal Materials, Devices, and Applications VII, (26 March 1999); https://doi.org/10.1117/12.343860

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