zero delay-focus-with-polight tlens

© poLight AS | All rights reserved www.polight.com1 | 2016-10-27

Zero delay Focus with poLight TLens®

Grenoble, 26 October 2016

© 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

PhoneOEM


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


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


AF Performances

0

100

200

300

400

500

600

0 20 40 60 80 100 120 140 160 180 200

Tim

e t

o f

ocu

s (m

s)

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

Tim

e t

o f

ocu

s (m

s)

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

Tim

e to

focu

s (m

s)

FPS( s-1)

Hill climbing

TLens® VCM

CurrentVCM TLens

VCM, 3 years ago

16 frames 7 frames



Do NOT search for the best focus, do NOT wait: Just shoot in burst mode

Based on Focus bracketing/StackingComputational photography

Based on Focus bracketing/StackingComputational photography

Only few frames



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


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