- The document discusses Helio Display, a technology that projects images in mid-air without a screen. It explains the basic construction of a Helio Display, which includes a screen generation unit, video projection unit, and control unit. - The screen generation unit uses a particle cloud to generate a translucent screen in mid-air, onto which the video projection unit projects images. The control unit controls both the screen generation and video projection units. - The document outlines the history of shadow puppetry and early projection technologies as predecessors to Helio Display. It also discusses potential applications for interactive Helio Displays and next steps in the technology's development.

1. Helio Display

2. Classroom Rules
• Maintain the decorum of the class.
• Raise your hand and wait to be called on before
speaking.
• No one should be speaking at the same time as
teacher.

3. Training Objective
• During the class, the students will learn the
construction and function of Helio Display

4. Learning Objective
• At the end of this class, students will be able to
– Explain the basic construction of helio display
– Describe the screen generation technique

6. History
• Shadow puppetry

7. History
• Camera Obscura used by Chinese in 470-391 BC

8. History
• Chinese magic mirrors in 240 BC- 24 AD

9. History
• Revolving Lanterns since before 1000 AD

10. History
• Helioscope by Benedetto Castelli in late 1500 AD

11. History
• Helioscope by Benedetto Castelli in late 1500 AD

12. History
• Opaque Projectors (Episcope) by Leonhard Euler in
late 1800s

13. History
• 20th century marked the advent of the modern
projectors.

14. What is Heliodisplay?
• Heliodisplay is a technology used
for displaying images in mid air.
• Invented by Chad Dyner who
found IO2 Technology.

15. FLOATING
IMAGE
(INPUT/OUTPUT
)
PARTICLE CLOUD
PARTICLE CLOUD
DELIVERY DEVICE
PARTICLE CLOUD
MANUFACTURE
STORAGE
EXTRACTION
DEVICE
AIR
SINGLE
IMAGE
DELIVERY
OPTICS
SINGLE IMAGE
GENERATION
MULTI-
DELIVER
Y OPTICS
MULTI-IMAGE
GENERATION
GRAPHICS
BOARD
PROCESSING
UNIT
STORAGE
EXTERNAL
SOURCE
SENSOR
FEEDBACK
CONTROLLER
AIR
Basic Construction
Video Projection Unit
Screen
Generation
Unit
Control
unit

16. Projection Screen Generation

17. Projection Screen Generation

18. Video Projection Unit
• Similar to the
conventional projection
units
• Should be controlled for
adaptive brightness

19. Control Unit
• Two basic functions
– Control the screen generation unit
– Control the video projection unit

20. Road Ahead
• Interactive Helio Display requiements
– Legitimate physical intrusion to be identified as an
input instruction
– Using finger, stylus or any other object
– Taking cues from laser reflection

21. Road Ahead

22. Summary
• We have learnt
– Basic construction of the helio display
– Functioning of screen generation unit in particular

23. Questions?

24. Questions to the class
• Where does Helio display project images?
– Mid air
• From where does the Helio display obtain moisture
for the translucent screen?
– From surrounding air
• What all subsystems does the control unit control?
– Screen Generation Unit and Video Projection Unit

25. Assignment
• Explain the functional block diagram of the Helio
display explaining the subsystems.
Assignment to be hand written, not less than 500
words and to be submitted before 1500 hrs on
28 Mar 21
Explain the underlying technology of hologram?
Assignment may be given as printout, not less than 500
words and to be submitted before 1500 hrs on
01 Apr 22

26. Bibliography
• Heliodisplay-A Novel Display Technology by Anna
Maria Jose, Priyanka Rajendran and Dr. Gnana Sheela
K printed in Vol.3, Special Issue 5, December 2014 of
International journal of Advanced Research in
Electrical, Electronics and Instrumentation
Engineering (IIAREEIE)
• Chad Dyner, “Method and system for free-space
imaging display and interface”, United States Patent,
US20040001182 AI