Heliodisplay

Lore & Background

The Heliodisplay was invented by Chad Dyner, who built a five-inch interactive prototype in 2000–2001 before patenting the free-space display technology. The original system used a CMOS camera and an IR laser to track a finger in mid-air, enabling the first co-located display with a mid-air control interface. IO2 Technology commercialized the original versions and made improvements over the years, with the first-generation M1 units showcased in 2003 supporting a 22-inch image and using an IR light source and camera for cursor control.

Subsequent models expanded in size and capability: the M2 supported a 30-inch image with 16.7 million colors and a 2000:1 contrast ratio, while the M3 (launched February 28, 2007) offered improved brightness, clarity, and quieter operation. Larger models followed, including the M50 (50-inch diagonal) and M100 (100-inch diagonal). In 2011, IO2 reintroduced smaller formats alongside L models projecting approximately 2-meter-tall images, with the base tower version weighing around 70 lbs (31.8 kg) and consuming about 300 watts. Later i versions reduced weight by nearly 50%, with 2.3-meter systems weighing closer to 38 lbs (17.2 kg) and a 20% reduction in footprint.

The Heliodisplay works by drawing in surrounding air and using a series of metal plates; the medium is primarily air, with water used mostly for cooling. The system may be viewed from both front and back when combined with two light sources, but an oblique viewing angle of ±30 degrees may be required for various configurations due to the rear-projection requirement. The image is two-dimensional and not volumetric, though dark areas may appear invisible, giving a more realistic appearance than on a projection screen.

Reader's Guide

The Heliodisplay represents a notable development in free-space display technology, offering a visible image without a solid screen. Its ability to function as a touchscreen—initially via IR laser tracking and later through an embedded processor in the i models—allowed for interactive mid-air control, a feature that distinguished it from conventional displays. The system's reliance on ambient air and minimal water consumption made it suitable for environments such as museums, where it had a negligible effect on the surrounding space.

Over successive generations, IO2 Technology improved image fidelity, reduced noise, and decreased power consumption and weight, making the units more practical for commercial use. The introduction of larger formats like the M50 and M100 enabled life-size projections, while later L and XL models expanded the range of applications. The Heliodisplay's legacy lies in its demonstration of a commercially available, non-volumetric free-space display with interactive capabilities, influencing subsequent developments in mid-air imaging and touchless interfaces. Its continued refinement through the i versions, with wireless communication and rapid image recovery, underscored the ongoing evolution of the technology.

Did You Know?

• The Heliodisplay uses water condensed from the air already present in the operating environment.
• The original 2001 prototype could be used as a pointing device with supplied software.
• The M100 model projects a 100-inch diagonal image, equivalent to a large full-body person about 2 meters tall.
• Later i versions reduced system weight by nearly 50% and improved equipment efficiency to over 90%.