Transparent and highly stable screen protector

Method for coating at least a transparent body (14), particularly a display glass (20) or a display protector layer,

• comprising at least the steps of:
• Arranging or producing the at least partly transparent body (14), particularly made of plastic, glass or a ceramic material, on a wear layer (6) produced according to claim,
• or
• Providing a carrier substrate (4) with a sacrificial layer (8) disposed thereon or arranging a sacrificial layer (8) on the carrier substrate (4) provided,
• Generating a wear layer (6) by chemical or physical vapour deposition on the sacrificial layer (8) to form a multilayer arrangement (2),
• Arranging or generating the at least partially transparent body (14) on the wear layer (6),
• Separating the wear layer (6) as a consequence of a material weakening created between the wear layer (6) and the carrier substrate (4)
• wherein the material weakening is caused by modifications (12) generated in the sacrificial layer (8) by LASER beams (10).

Method according to any one of the preceding claims, characterised in that

• the wear layer (6) is separated by means of a crack guided between the wear layer (6) and the carrier substrate (4)
• wherein the crack is guided by modifications (12) generated in the sacrificial layer (8) by LASER beams (10) and/or
• wherein stresses for initiating and/or propagating the crack are generated via a thermal shock to a stress-inducing layer (16) arranged additionally on the multilayer arrangement (2)
• the stress-inducing layer (16) contains or consists of a polymer, particularly polydimethylsiloxane (PDMS), wherein the thermal shock is applied in such manner that the polymer undergoes a glass transition, wherein the temperature of the stress-inducing layer (16) is adjusted particularly by means of liquid nitrogen to a temperature at which the polymer undergoes at least partial and preferably complete glass transition, in which the temperature of polymer is preferably cooled to a temperature below room temperature or below 0° C. or below −50° C. or below −100° C. or below −110° C., particularly to a temperature below the glass transition temperature of the stress-inducing layer (16), or the temperature is adjusted a temperature above room temperature, particularly to a temperature between 40° C. and 180° C.

Method according to any one of the preceding claims, characterised in that

• the LASER device (11) comprises a femtosecond LASER (fs LASER) and the energy of the LASER beams (10) of the fs-LASER is chosen such that the propagation of the damage of any modification (12) in the wear layer (6) and/or the sacrificial layer (8) is less than 3 times the Rayleigh length, preferably less than the Rayleigh length and particularly preferably less than one-third of the Rayleigh length
• and/or
• the wavelength of the LASER beams (10) of the fs-LASER is chosen such the absorption by the wear layer (6) and/or the sacrificial layer (8) is less than 10 cm−1 and preferably less than 1 cm−1 and more preferably less than 0.1 cm−1
• and/or the individual modifications (12) are each generated as a consequence of a o multi-photon excitation effected by the fs-LASER.

Method according to any one of the preceding claims, characterised in that

• the carrier substrate (4) is crystalline and the sacrificial layer (8) serves as a transfer layer, wherein the transfer layer (8) is arranged between the carrier substrate (4) and the wear layer (6) and is joined to the carrier substrate (4) and the wear layer (6),
• wherein the sacrificial layer (8) is designed such that it transfers a crystal lattice information of the carrier substrate (4) to the wear layer (6),
• wherein the wear layer (6) is produced or treated in such manner that at least part thereof has a crystal lattice,
• wherein the formation of the crystal lattice is based at least in part on the crystal lattice information provided by the transfer layer (8).

Multilayer transparent device, particularly a display element or fingerprint sensor element or glasses lens or visor, particularly a helmet visor,

• comprising at least an at least partially transparent body (14) and an at least partially transparent wear layer (6) connected to the transparent body (14),
• wherein the transparent body (14) preferably contains a polymer material or a ceramic material or a viscous material such as glass, and said wear layer (6) consists of a ceramic material, wherein the wear layer (6) is harder than the transparent body (14) and
• wherein the production of the multilayer transparent device comprises at least the following steps:
• Generating the wear layer (6) by chemical or physical vapour deposition and
• Arranging the transparent body (14) on the wear layer (6), particularly by generation or bonding.