The first optical holographic projection photo of a real three-dimensional object was taken by Soviet scientist Yuri Denisuke in 1962. At the same time, Emmett Lees and Juris Upatnix, the radar laboratory staff of the University of Michigan, also invented the same technology. Nicholas Phillips improved photochemical processing technology to produce high-quality holographic projection pictures.
Holographic projection can be divided into the following categories. Transmission holographic projection, such as the technology invented by Liz and Upatinix, is to irradiate holographic projection film with laser, and then observe the reconstructed image from another direction. Later, after improvement, rainbow holographic projection can be illuminated with white light to observe the reconstructed image. Rainbow holographic projection is widely used in credit card anti-counterfeiting, anti-counterfeiting and product packaging. These kinds of rainbow holographic projection usually form a surface relief pattern on a plastic film, and then the light is transmitted through the film through the aluminum-plated film on the back to reconstruct the image. Another common holographic projection technique is called reflection holographic projection, or Danisuke holographic projection. This technology can use a white light source to illuminate the film from the same direction as the observer, and reconstruct the color image by reflection, thus reconstructing the image. Mirror holographic projection is a related technology to generate three-dimensional images by controlling the movement of mirrors on two-dimensional surfaces. It constructs a holographic image by controlling reflected light or refracted light, while Gabor's holographic projection reconstructs the wavefront by diffracting light.
The key reason for the rapid development of holographic projection in a short time is the mass production of low-cost solid-state lasers, such as those used in DVD players and other common devices. These lasers have also greatly promoted the development of holographic projection. These cheap and small solid-state lasers can compete with those large and expensive gas lasers originally used for holographic projection under certain conditions, so researchers, artists and even amateurs with low budgets can participate in holographic projection research.
20 14 June, a startup company in California, USA, is developing a three-dimensional holographic projection chip. By the end of 20 15 at the earliest, smartphones will have 3D projection function. A pill-sized three-dimensional holographic projector with a resolution of 5000PPI is developed, which can accurately control the brightness, color and angle of each beam of light.
Only one chip is needed to project an acceptable three-dimensional holographic image, but as long as the number of chips is increased, three-dimensional objects with more complex shapes can be projected with more detailed details. The research and development of this chip and technology is still in its infancy. The first chip is a holographic projection for two-dimensional images, which was delivered to mobile phone manufacturers in the summer of 20 15.
The second projection chip they developed will be able to realize holographic three-dimensional projection, and the three-dimensional image can float in the air and look like a real object. A few months after the launch of the first chip, the second chip will also begin to enter the production and manufacturing.
In addition to smart phones, the three-dimensional holographic projection chip developed by the company will also enter various display devices, such as televisions, smart watches and even "holographic desktops". At that time, the era of three-dimensional holographic projection will really come.