Optical device with holographic layer

A process for manufacturing an optical device, said process comprising:

• forming a textured layer comprising a first surface having first macro-textures;
• and
• positioning the first surface of the textured layer facing a carrier comprising on its surface a holographic layer intermediate between the textured layer and the carrier,
• the holographic layer comprising a diffraction grating forming, via a holographic effect, an arrangement of pixels in a basis of at least two distinct colours;
• and
• laminating the first surface of the textured layer on the carrier, causing a deformation by the first macro-textures of the holographic layer placed between the textured layer and the carrier, so as to form in the holographic layer second macro-textures conformal with said first macro-textures, a visual appearance of the arrangement of pixels being personalized via the second macro-textures, the visual appearance being created by forming different patterned portions of the second macro-textures in the holographic layer,
• wherein the second macro-textures of the holographic layer are of semi-cylindrical or elliptical shape and extend along a first orientation in a plane of the holographic layer,
• each pixel being formed by a corresponding segment of the diffraction grating, said corresponding segment being structured into diffractive lines extending along a second orientation perpendicular to the first orientation in the plane of the holographic layer.