Cameraphone Autofocus approach revisited. Thanks to poLight TLens actuator

1. © poLight AS | All rights reserved www.polight.com1 | 2016-10-27
Zero delay Focus with
poLight TLens®
Grenoble,
26 October 2016

2. © poLight AS | All rights reserved2 | 2016-10-27 www.polight.com
TLens® Technology – Principle of Operation
Light
Polymer
Glass membrane
Glass support
Piezo-film
From Gel > MEMS Wafer > TLens® > Camera module > Phone OEM
Camera
Module
Suppliers
Phone
OEM

3. © poLight AS | All rights reserved3 | 2016-10-27 www.polight.com
TLens versus VCM
VCM
 Huge number of elements
 Power hungry
 Slow
TLens
 Simple device
 Ultra Low Power
 Stable optical axis
 Very Fast
 No gravity effect
 Constant Field of View
TLens
 Simple device
 Ultra Low Power
 Stable optical axis
 Very Fast
 No gravity effect
 Constant Field of View

4. © poLight AS | All rights reserved4 | 2016-10-27 www.polight.com
Hill Climbing / Contrast AF
• This method is based on scanning the focus range, and for each image
measure the contrast, then go back to the maximum contrast:
Focused Image: “hill climbing” algorithm
• If we assume the maximum number
of image to scan the full range is 10 to
11 images, the full process (worst
case) takes about 12 images to get an
frames to get the correct focus
• Performances is directly related to
frame rate

5. © poLight AS | All rights reserved5 | 2016-10-27 www.polight.com
AF Performances
0
100
200
300
400
500
600
0 20 40 60 80 100 120 140 160 180 200
Timetofocus(ms)
FPS( s-1)
PDAF + Contrast AF
Tlens® VCM
VCM
TLens
Hybrid PDAF
0
100
200
300
400
500
600
0 20 40 60 80 100 120 140 160 180 200
Timetofocus(ms)
FPS( s-1)
PDAF + Contrast AF
Tlens® VCM
VCM
TLens
Hybrid PDAFContrast AF
0
100
200
300
400
500
600
700
800
900
1000
0 20 40 60 80 100 120 140 160 180 200
Timetofocus(ms)
FPS( s-1)
Hill climbing
TLens® VCM
Current
VCM TLens
VCM, 3 years ago
16 frames 7 frames

6. © poLight AS | All rights reserved6 | 2016-10-27 www.polight.com
Zero delay Focus with poLight TLens®
 Do NOT search for the best focus, do NOT wait: Just shoot in burst mode
Based on Focus bracketing/Stacking
Computational photography
Based on Focus bracketing/Stacking
Computational photography
Only few frames

7. © poLight AS | All rights reserved7 | 2016-10-27 www.polight.com
Zero delay Focus with poLight TLens®
 Based on Focus bracketing/Stacking
 Main Advantages versus traditional AF:
- Speed
- Post reFocus / All in Focus
- Independent of lighting conditions (issue with PDAF)
 TLens key advantages for “Zero Focus delay”
- Speed
- No Field of View change
- Optical axis stability

8. © poLight AS | All rights reserved8 | 2016-10-27 www.polight.com
Q&A and Conclusion
Extremely low power
consumption
Touch & re-Focus
Constant field of view
Instant focus
Smart implementation
of dual camera
High performance front
facing camera
All in focus
TLens®
No magnetic
interference High optical
Axis Stability
Low Test &
Calibration Cost
poLight® AF
actuator unique
performance will
enhance the
mobile camera
functionality,
enabling a whole
new level of
picture quality,
functionality and
user experiences

9. © poLight AS | All rights reserved www.polight.com9 | 2016-10-27
Thank you