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Past and future challenges from a display mask writer perspective
KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Metrology and Optics. Micronic Mydata AB, Sweden .
2012 (English)In: Photomask and Next-Generation Lithography Mask Technology XIX, SPIE - International Society for Optical Engineering, 2012, Vol. 8441, 84410N- p.Conference paper (Refereed)
Abstract [en]

Since its breakthrough, the liquid crystal technology has continued to gain momentum and the LCD is today the dominating display type used in desktop monitors, television sets, mobile phones as well as other mobile devices. To improve production efficiency and enable larger screen sizes, the LCD industry has step by step increased the size of the mother glass used in the LCD manufacturing process. Initially the mother glass was only around 0.1 m 2 large, but with each generation the size has increased and with generation 10 the area reaches close to 10 m2. The increase in mother glass size has in turn led to an increase in the size of the photomasks used - currently the largest masks are around 1.6 × 1.8 meters. A key mask performance criterion is the absence of "mura" - small systematic errors captured only by the very sensitive human eye. To eliminate such systematic errors, special techniques have been developed by Micronic Mydata. Some mura suppressing techniques are described in this paper. Today, the race towards larger glass sizes has come to a halt and a new race - towards higher resolution and better image quality - is ongoing. The display mask is therefore going through a change that resembles what the semiconductor mask went through some time ago: OPC features are introduced, CD requirements are increasing sharply and multi tone masks (MTMs) are widely used. Supporting this development, Micronic Mydata has introduced a number of compensation methods in the writer, such as Z-correction, CD map and distortion control. In addition, Micronic Mydata MMS15000, the world's most precise large area metrology tool, has played an important role in improving mask placement quality and is briefly described in this paper. Furthermore, proposed specifications and system architecture concept for a new generation mask writers - able to fulfill future image quality requirements - is presented in this paper. This new system would use an AOD/AOM writing engine and be capable of resolving 0.6 micron features.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2012. Vol. 8441, 84410N- p.
, Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X ; 8441
Keyword [en]
Glass, Glass industry, Image quality, Liquid crystal displays, Liquid crystals, Mobile devices, Mobile telecommunication systems, Compensation method, Distortion control, Liquid crystal technology, Manufacturing process, Performance criterion, Production efficiency, Quality requirements, System architectures
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URN: urn:nbn:se:kth:diva-165145DOI: 10.1117/12.970249ISI: 000312199500022ScopusID: 2-s2.0-84900489791ISBN: 9780819491367OAI: diva2:808166
Photomask and Next-Generation Lithography Mask Technology XIX, 17 April 2012 through 19 April 2012, Yokohama, Japan

QC 20150427

Available from: 2015-04-27 Created: 2015-04-23 Last updated: 2015-04-27Bibliographically approved

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Ekberg, Peter
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