Note: Holographic display does not refer to holography or holographic photography invented by dennis gabor in 1956. It is a next-generation display technology that projects a three-dimensional image in a three-dimensional space (the image is a physical "three-dimensional" rather than a purely visual "three-dimensional"). This paper mainly introduces the holographic photography technology and its derivative product "holographic anti-counterfeiting mark"

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Holography

A photography method invented by dennis gabor. The photos printed by this photography method can be viewed from multiple angles, but there are angular limitations. Many anti-counterfeiting signs are made of images printed by holography.

Front-projected holographic display can also be regarded as a kind of holographic image in a broad sense, but the so-called holographic picture is only projected on a transparent "holographic plate". Therefore, the so-called holographic image is just a plane rather than a three-dimensional image. This is the most widely used holographic technology at present.

holographic display

holographic image technology that is still under study and mostly appears in science fiction works. To create a physically pure three-dimensional image, viewers can observe and even enter the image from different angles without restriction.