What is lenticular?

Some articles on lenticular:

Lenny Lipton - Patents
... US patent 7808708, "Aperture correction for lenticular screens" US patent 7804995, "Stereoscopic format converter" US patent 7775387, "Eyewear receptacle" US patent 7760429, "Multiple mode display device" US ... US patent 7508589, "Soft aperture correction for lenticular screens" US patent 7502003, "Method for eliminating pi-cell artifacts" US patent 7477206, "Enhanced ZScreen ...