DISPLAY DEVICE HAVING A WATERMARK FORMED BY HALFTONE IMAGES

The present invention is directed to display devices comprising a plurality of microcells. The plurality of microcells comprises different types of microcells having different Fill Factors. The devices have a watermark being formed by halftone images from the different types of microcells. The water...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	CHAN, Bryan Hans, KANG, Yih-Ming
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	The present invention is directed to display devices comprising a plurality of microcells. The plurality of microcells comprises different types of microcells having different Fill Factors. The devices have a watermark being formed by halftone images from the different types of microcells. The watermark aims to protect against counterfeiting or to be used for decoration purposes. La présente invention concerne des dispositifs d'affichage comprenant une pluralité de microcellules. La pluralité de microcellules comprend différents types de microcellules ayant différents facteurs Fill. Les dispositifs ont un filigrane qui est formé par des images en demi-teinte à partir des différents types de microcellules. Le filigrane a pour but de protéger contre la contrefaçon ou d'être utilisé à des fins de décoration.