Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche...
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Transcript of Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche...
![Page 1: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/1.jpg)
Backlight for view-sequential autostereo 3D
Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn
Microsoft Corporation
![Page 2: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/2.jpg)
Contents
• View sequential 3D
• Design of wedge backlight
• Results
![Page 3: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/3.jpg)
An eye sees an image only if rays from the display reach the eye
lens
Liquid crystal display
LED
![Page 4: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/4.jpg)
A different eye sees the image if we alter the angle of the rays
![Page 5: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/5.jpg)
Repeat the sequence at a high enough rate to avoid flicker.Get 3D by showing one view at a time to each eye & repeating fast to avoid flicker
head tracker
High frame-rate
LCD
![Page 6: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/6.jpg)
Repeat the sequence at a high enough rate to avoid flicker.Get 3D by showing one view at a time to each eye & repeating fast to avoid flicker
head tracker
High frame-rate
LCD
![Page 7: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/7.jpg)
Repeat the sequence at a high enough rate to avoid flicker.Get 3D by showing one view at a time to each eye & repeating fast to avoid flicker
head tracker
High frame-rate
LCD
![Page 8: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/8.jpg)
Repeat the sequence at a high enough rate to avoid flicker.Get 3D by showing one view at a time to each eye & repeating fast to avoid flicker
head tracker
High frame-rate
LCD
![Page 9: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/9.jpg)
Repeat the sequence at a high enough rate to avoid flicker.Get 3D by showing one view at a time to each eye & repeating fast to avoid flicker
head tracker
High frame-rate
LCD
![Page 10: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/10.jpg)
Effect response time/s
contrast grayscale field of view
Polarisation Shielded Smectic
<500 @ 5V better than nematic
continuous & flat response
wide
Flexoelectric 10~100 2000:1 continuous ok with film
Banana-shaped 100 3000:1 continuous wide
Blue phase <1000 3000:1 continuous wide and symmetric
Liquid crystals can switch gray levels fast with good contrast versus angle
![Page 11: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/11.jpg)
We have: >240 Hz LCDs
good head trackingbut the lens is bulky
![Page 12: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/12.jpg)
Contents
• View sequential 3D
• Design of wedge backlight
• Results
![Page 13: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/13.jpg)
reflect
reflect
Collimate by reflection off a curve. But how do we get uniform emission?
LED
curve
![Page 14: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/14.jpg)
Rays exit a wedge light-guide at the critical angle. Trace them backwards
turningfilmwedge
light-guide
![Page 15: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/15.jpg)
Rays travel as if straight through a stack of wedges.
actual ray
apparent ray
![Page 16: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/16.jpg)
The thick ends form a curve. Make this spherical so it concentrates the rays.
focuscurve
![Page 17: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/17.jpg)
Emboss the thick end with facets to reduce ray angle & guide rays to focus
focus
![Page 18: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/18.jpg)
By symmetry, the facets must be a zig-zag so rays exit from top & bottom
facets
LED
![Page 19: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/19.jpg)
![Page 20: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/20.jpg)
Wedge is steering light into each individual's eyes. Each person gets their own unique image.
![Page 21: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/21.jpg)
Contents
• View sequential 3D
• Design of wedge backlight
• Results
![Page 22: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/22.jpg)
Results: Image cast on a screen with red & blue LED’s at the wedge thin end
![Page 23: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/23.jpg)
Precision: Far field image with 3 red, 3 green & 3 blue LEDs at the thin end
![Page 24: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/24.jpg)
Uniformity: photograph of backlight with 3 green LED’s at thin end.
![Page 25: Backlight for view-sequential autostereo 3D Adrian Travis, Neil Emerton, Tim Large, Steven Bathiche and Bernie Rihn Microsoft Corporation.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649db25503460f94aa1dc4/html5/thumbnails/25.jpg)
Conclusions
• We get uniformity by the light-guide shape instead of by scattering
• The collimated backlight enables low power, privacy and 3D
• We try to think of the LCD as part of a system of projection