A method is disclosed. For example, the method includes applying a clear coat layer on a substrate, drying the clear coat layer to form random microstructures in the clear coat layer, dispensing a printing fluid to print a graphical pattern on the clear coat layer, and generating a physical unclonable function (PUF) pattern by drying the printing fluid that fills the random microstructures formed in the clear coat layer.

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.

A greeting card having a housing of metal or a metal alloy that defines an interior void and an electronic ink display screen, a Bluetooth adapter or dongle comprising Bluetooth low energy (BLE) technology within the interior void and operatively configured to communicate with the display screen, a non-transitory memory storage device, and another electronic component within the interior void. The Bluetooth adapter or dongle is configured to receive from an external electronic device a first communication of information describing an initial message to be displayed, and to receive, subsequent in time to receipt of the initial message, a second real time communication of information describing a second message. The non-transitory memory storage device has pre-loaded executable instructions to display the first communication on the display screen, to change or modify the initial message based on the second real-time communication, and to display the second message on the display screen.

An optically variable security element wherein the areal expansion whereof defines a z direction standing perpendicularly thereon, and has a multicolored, reflective areal region. The areal region includes two relief structures arranged at different height levels in the z direction. The relief structures are each supplied with an ink coating which produce a different color impression. The ink coating of the relief structure disposed at a higher level is configured in the feature region as a regular or irregular grid with grid elements and grid spaces. The dimensions of the grid elements and/or grid spaces are below 140 μm at least in one direction, so that, in the feature region, for a viewer from at least one viewing angle, the ink coating of the relief structure disposed at a lower level is visible through the grid spaces of the ink coating of the relief structure disposed at a higher level.

A display element includes a plurality of display areas, each display area including a plurality of sub display areas, each sub display area including a plurality of cells. A boundary portion formed into a groove structure so as to surround the cells. A plurality of prism structures each having a triangular cross section are arranged in parallel to each other in the cells so as to extend linearly or in an arc, and the boundary portion includes a rib structure connected to both ends of one or more of the prism structures. A display area is to display different motifs, in response to one or more of the sub display areas changing an optical property to become reflective or transmissive in accordance with one or both of an orientation angle and an elevation angle of observation.

A display element includes a plurality of display areas, each display area including a plurality of sub display areas, each sub display area including a plurality of cells. A boundary portion formed into a groove structure so as to surround the cells. A plurality of prism structures each having a triangular cross section are arranged in parallel to each other in the cells so as to extend linearly or in an arc, and the boundary portion includes a rib structure connected to both ends of one or more of the prism structures. A display area is to display different motifs, in response to one or more of the sub display areas changing an optical property to become reflective or transmissive in accordance with one or both of an orientation angle and an elevation angle of observation.

The present disclosure is directed towards a security sheet (10) for displaying personal data (11) comprising a plastic substrate (12) comprising first and second outer surfaces (13, 14). A first opaque region (21) extends partially across the plastic substrate (12) between the first and second outer surfaces (13, 14). A first window (50) is at least partially surrounded by the first opaque region (21). A security device (51) comprises a transparent first device region (52) and a second device region (53) formed from a second device insert (55). The first and second device regions (52, 53) have different optical detection characteristics. The security device (51) is arranged in the plastic substrate (12) such that, when viewed in reflected light incident upon the first outer surface (13), at least part of the first device region (52) is visible at least partially around the second device region (53) in the first window (50).

A lens pigment suitable for manufacturing value documents by printing technology, includes a carrier substrate which forms a lens base and which is supplied on its front side with a first plastic having at least one elevation that produces a microlens and with a second plastic leveling the first plastic.

A lens pigment suitable for manufacturing value documents by printing technology, includes a carrier substrate which forms a lens base and which is supplied on its front side with a first plastic having at least one elevation that produces a microlens and with a second plastic leveling the first plastic.

A method for producing a decorative element and uses of a decorative element. A polarizing layer functioning as an analyzer is applied to a transparent optical carrier material and a transparent optical functional layer is applied as an image-forming layer including an optically anisotropic material. By spatially structuring the functional layer, a targeted location-dependent dependency of material properties of the optically anisotropic material is created for producing the image-forming layer. One or several decorative elements produced can each be introduced into a light field of a lighting device in a desired shape, size and quantity and having settable image motifs (image structures) and being disposed at different spatial distances and being freely disposable. The decorative element produced is intended to be used as an architectural element for creating light-optical effects in the exterior area of buildings, as a design element for interior design or for object design.