Alternatives to Holograms for Real 3-D Displays

These light-reflecting and laser-induced plasma displays aren't your standard stereoscopic illusions

2 min read
Alternatives to Holograms for Real 3-D Displays

At this year's Consumer Electronics Show, it was 3-D everywhere the eye could see--well, everywhere that two eyes could see. Many of the displays that we looked at use stereoscopic techniques, which present a different image to each eye to give the illusion of depth. Of course, when you only have one eye, or a standard video camera, the illusion vanishes; instead of bikini-clad beach-goers bursting out of the screen (a subject starring in an uncomfortable number of demonstration videos) your camera will capture only a blur.

But at least two companies at the show have created more camera-friendly 3-D displays. One reflects light from three glass plates and another uses lasers to create glowing plasma in air and water.

The Taiwanese company InnoVision presented their HoloAD display. The devices have slanted glass on three sides and an opaque straight backing on the fourth. A hood above these glass plates houses downward-facing 2-D displays. As viewers move 180 degrees around the device, they can see the overlapping images reflected on the glass. A manager at the company, who goes by the name Bear King, notes that the device is meant for advertising products, as the non-reflective side has a door to insert a real three-dimensional object. In one of his display models, an iPhone appears to project a 3-D globe. In another, a cartoon fish swims laps in a glass bowl.

SoongBae Dong in the research and development department at another, Japanese company, Burton Inc., says their product provides a "real" 3-D image--as the light viewers see is actually located in three dimensions. While some have imagined holographic displays that project light on mist or smoke, Burton's device, dubbed Aerial 3D, creates laser-induced plasma in precise locations in air or water to make an image. The display at the show used water as the medium, and created a pulsating blob, a rotating face, and a man walking. The product is not commercially available (and Dong has no estimates for a product's release) but the company's website hints that future applications could include a crossing signal for use over roads and a tsunami warning system. The images are currently monochromatic, but Dong says that multicolor displays are already in the works. One can only guess if plasma bikinis will follow. 

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Digging Into the New QD-OLED TVs

Formerly rival technologies have come together in Samsung displays

5 min read
Television screen displaying closeup of crystals

Sony's A95K televisions incorporate Samsung's new QD-OLED display technology.

Sony
Blue
Televisions and computer monitors with QD-OLED displays are now on store shelves. The image quality is—as expected—impressive, with amazing black levels, wide viewing angles, a broad color gamut, and high brightness. The products include:

All these products use display panels manufactured by Samsung but have their own unique display assembly, operating system, and electronics.

I took apart a 55-inch Samsung S95B to learn just how these new displays are put together (destroying it in the process). I found an extremely thin OLED backplane that generates blue light with an equally thin QD color-converting structure that completes the optical stack. I used a UV light source, a microscope, and a spectrometer to learn a lot about how these displays work.

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