DIFFRACTION ELEMENT

Organization Name

Inventor(s)

Masaaki Suzuki of Minamiashigara-shi (JP)

DIFFRACTION ELEMENT

This abstract first appeared for US patent application 20240427065 titled 'DIFFRACTION ELEMENT

Original Abstract Submitted

provided is a diffraction element having excellent aligning properties of a liquid crystal compound. the diffraction element includes an optically-anisotropic layer that has a liquid crystal alignment pattern in which an orientation of an optical axis derived from a liquid crystal compound changes while continuously rotating in at least one in-plane direction, in which a birefringence �n of the optically-anisotropic layer is 0.20 or more, the optically-anisotropic layer includes a surfactant, and in a case where components in a depth direction are analyzed by time-of-flight secondary ion mass spectrometry from one surface to another surface of the optically-anisotropic layer, a depth-direction profile of a secondary ion intensity derived from the surfactant is obtained, a position corresponding to a thickness of 20% from the one surface of the optically-anisotropic layer is represented by a position d, a position corresponding to a thickness of 80% from the one surface is represented by a position d, and an average value of secondary ion intensities derived from the surfactant between the position d and the position d is calculated, in a region from the position d to the position d, a peak having a size of 1.1 times or more the average value is observed and a peak having a size of 5 times or more the average value is not observed.