Method for producing a finishing layer containing a window for a portable data storage medium and said finishing layer

A method for producing a finishing layer containing a window for a portable data storage medium, comprising the steps:

• providing a transparent plastic-based support layer,
• applying an opaque color layer by screen printing, wherein the color layer comprises a cutout having the dimensions of the window,
• applying to the opaque color layer a first transparent buffer layer by screen printing,
• applying a design color layer over the buffer layer by offset printing, and
• applying a transparent finish over the design color layer.

A portable data storage medium comprising an active display element disposed in a core layer, and which display element is visible from a viewing side through the surface of the portable data storage medium, wherein a finishing layer is disposed over the core layer having the display element, the outer surface of said finishing layer facing away, and forming the surface of the portable data storage medium, and wherein the finishing layer comprises:

• a transparent support layer having a thickness between 50 and 100 μm,
• an opaque color layer cut out above the display area of the active display element and having a height between 10 and 80% of the height of the support layer in the dry state,
• a primer layer, the height of which is being between 10% and 40% of the height of the support layer in the dry state,
• a design color layer over the primer layer,
• and a finish layer having an open top side forming a surface of the portable data storage medium.