Light reactive media

A method of forming a lenticular image including a plurality of images on a light-sensitive layer of a medium to be viewable at respective different viewing angles through a lenticular layer of the medium, comprising:

• passing light through a lenticular layer of the medium onto the light-sensitive layer of the medium at different writing angles, to form the respective images viewable at the respective viewing angles.

A lenticular imaging medium, comprising:

• a light sensitive imaging layer;
• and
• a lenticular layer over the light sensitive imaging layer to allow light to impinge onto the imaging layer so as to form an image.

A photoluminescent display system, comprising:

• an array of pixels each including a plurality of phosphorescent elements arranged to emit visible light of a respective different colour when excited by incident light of a predetermined frequency;
• and
• a control system to control spatial distribution of the incident light to generate a visible image.

A photoluminescent display system, comprising:

• an array of pixels, each including first and second phosphorescent elements arranged to emit visible light when excited by incident light of a predetermined frequency;
• and
• and an optical layer arranged such that light from the first and second phosphorescent elements is visible from different directions.