Microdisplay PhD thesises
Design of LCOS Microdisplay
Backplanes for Projection Applications ( 9'649'141 bytes)
by Jean Van den Steen
(English + Dutch summary) (2006)
Vertically Aligned Nematic Liquid Crystal
MicroDisplays for Projection Applications ( 4'402'678 bytes)
by Dieter Cuypers
(English + Dutch summary) (2005)
Introduction of color in reflective PDLC and PNLC microdisplays ( 11'329'293 bytes)
by Filip Bruyneel
(English + Dutch summary) (2002)
Microdisplay publications
-
G. Van Doorselaer,
N. Carchon,
J. Van den Steen,
D. Cuypers,
J. Vanfleteren,
H. De Smet and
A. Van Calster. A Reflective Polymer Dispersed Information Display made
on CMOS. Proceedings of the International Congress on Imaging Science
ICPS`98. Vol. 2. 1998. 222-225.
-
G. Van Doorselaer,
N. Carchon,
J. Van den Steen,
J. Vanfleteren,
H. De Smet,
D. Cuypers and
A. Van Calster. Characterisation of a paper-white reflective PDLC
microdisplay for portable IT applications. Proceedings of the 18th
international display research conference (Asia Display `98). 1998.
55-58.
-
G. Van Doorselaer,
N. Carchon,
J. Van den Steen,
D. Cuypers,
J. Vanfleteren,
H. De Smet and
A. Van Calster. A silicon based reflective polymer dispersed LC display
for portable low power applications. Proceedings of the IS&T/SPIE
Conference on Liquid Crystal Materials, Devices, and Applications VII.
Vol. 3635. 1999. 95-102.
-
H. De Smet,
J. Van den Steen,
N. Carchon,
D. Cuypers,
C. De Backere,
M. Vermandel,
A. Van Calster,
A. De Caussemaeker,
A. Witvrouw,
H. Ziad,
K. Baert,
P. Colson,
G. Schols and
M. Tack. The Design and Fabrication of a 2560x2048 Pixel Microdisplay
Chip. Proceedings of the 19th International Display Research Conference
(EuroDisplay`99). VDE Verlag. 1999. 493-496.
-
J. Van den Steen,
H. De Smet,
G. Van Doorselaer,
A. Van Calster and
P. Colson. Cost effective reticule design for very high resolution Si
Backplane prototypes. Proceedings of the Sixth International Display
Workshops (IDW`99). SID. 1999. 235-238.
-
C. De ackere,
M. Vermandel,
J. Van den Steen,
H. De Smet and
A. Van Calster. A silicon Backplane Technology for Microdisplays.
Proceedings of the 29th European Solid-State Device Research Conference
ESSDERC`99. Vol. 29. 1999. 712-715.
-
H. De Smet and
A. Van Calster. Microdisplays. Proceedings of the 11th Symposium and
Seminar on Displays and Display Technology (VISU 99). 1999.
-
H. De Smet. Liquid crystal displays on monocrystalline silicon.
Proceedings of the 11th Symposium and Seminar on Displays and Display
Technology. 1999.
-
F. Bruyneel,
H. De Smet,
A. Van Calster and
J. Egelhaaf. Measurement and evaluation of the applicability of
reflective displays for direct view applications. Proceedings of the
seventh International Display Workshops. 2000. 45-48.
-
A. Van Calster,
F. Bruyneel,
D. Cuypers,
N. Carchon,
G. Van Doorselaer,
J. Van den Steen and
H. De Smet. Miniature reflective displays. Proceedings of the seventh
International Display Workshops. 2000. 179-182.
-
F. Bruyneel,
H. De Smet,
J. Vanfleteren,
A. Van Calster,
T. Fujisawa and
M. Aizawa. Characteristics of PNLC in reflective displays.
Proceedings of the 20th International Display Research Conference (IDRC).
2000. 217-220.
-
G. Van Doorselaer,
J. Van den Steen,
H. De Smet,
D. Cuypers and
A. Van Calster. Flicker reduction in AMLC displays by individual pixel
voltage correction. Proceedings of the 20th International Display
Research Conference (IDRC). 2000. 447-450.
-
P.M.F. Colson,
F. De Pestel,
M. Tack,
G. Schols,
H. De Smet,
J. Van den Steen and
A. Van Calster. The design and fabrication of a GXGA microdisplay chip.
Proceedings of the SPIE on Micromachining, Micromanufacturing and
Microelectronic Manufacturing 2000. Burnett, D.; Kimura, S.; Singh, B.
SPIE. Challenges in Process Integration. Vol. 4181. 2000. 315-323.
-
F. Bruyneel,
H. De Smet,
J. Vanfleteren and
A. Van Calster. Assembly of reflective PDLC microdisplays. 2001
International Symposium Digest of Technical Papers. Vol. 17. 2001.
442-445.
-
A. Van Calster,
D. Cuypers,
F. Bruyneel,
N. Carchon,
G. Van Doorselaer,
J. Van den Steen and
H. De Smet. Microdisplays: A cost-effective technology for
high-resolution displays. Proceedings of Displays and Vacuum Electronics.
Information Technology Society of VDE. 2001. 115-119.
-
H. De Smet,
J. Van den Steen and
A. Van Calster. Microdisplays with high pixel counts (invited).
Proceedings of SID 2001 International Symposium Digest of technical papers.
Vol. XXXII. 2001. 968-971.
-
J. Van den Steen,
G. Van Doorselaer,
D. Cuypers,
H. De Smet,
A. Van Calster,
F. Chu and
L.Y. Tseng. A 0.9 XGA LCoS backplane for projection applications.
Proceedings of Microdisplay 2001 (Digest of papers). 2001. 87-90.
-
H. De Smet,
J. Van den Steen and
P. Colson. Use of stitching in microdisplays fabrication. Proceedings
of SPIE/Projection Displays VIII. Vol. 4657. 2002. 23-30.
-
H. De Smet,
D. Cuypers,
A. Van Calster,
J. Van de Steen and
G. Van Doorselaer. Design, fabrication and evaluation of a
high-performance XGA VAN-LCOS microdisplay. Displays. Elsevier. Vol.
23. 2002. 89-98.
-
F. Bruyneel,
D. Cuypers,
H. De Smet and
A. Van Calster. Reflective color PDLC displays using color filters.
Proceedings of the 2002 international symposium of the society for
information display. Vol. XXXIII. 2002. 534-537.
-
G. Van Doorselaer,
D. Cuypers,
H. De Smet,
J. Van den Steen,
A. Van Calster,
K.-S. Ten and
L.-Y. Tseng. A XGA VAN-LCoS projector. Proceedings of the 22nd
International Display Research Conference (IDRC) (Eurodisplay 2002).
2002. 205-208.
-
D. Cuypers,
G. Van Doorselaer,
J. Van Den Steen,
H. De Smet and
A. Van Calster. A projection system using vertically aligned nematic
Liquid Crystal on Silicon Panels. Proceeedings of the ninth International
Display Workshops (IDW). 2002. 45-48.
-
D. Cuypers,
H. De Smet,
G. Van Doorselaer,
J. Van Den Steen and
A. Van Calster. A measurement methodology for vertically aligned nematic
reflective displays. Proceedings of SPIE (Electronic Imaging Science and
Technology): Projection Displays IX. Ming H. Wu 2003. 62-72.
-
H. De Smet,
J. Van den Steen,
G. Van Doorselaer,
D. Cuypers,
N. Carchon and
A. Van Calster. On the development of VAN LCOS microdisplays (invited).
Proceedings of the IEEE LEOS Annual Meeting Conference . Vol. 2.
2003. 814-815.
-
Dieter Cuypers,
Geert Van Doorselaer,
Jean Van Den Steen and
Herbert De Smet. WXGA LCoS Projection Panel with Vertically Aligned
Nematic LC. Proceedings of the 10th International Display Workshops.
2003.
-
H. De Smet,
J. Van den Steen and
D. Cuypers. Spice Model for a Dynamic Liquid Crystal Pixel Capacitance.
Proceedings of The 10th International Display Workshops (IDW `03).
2003. 53-55.
 
-
Herbert De Smet,
Jean Van den Steen and
Dieter Cuypers. Electrical model of a liquid crystal pixel with dynamic,
voltage-history dependent capacitance value. Liquid Crystals. Taylor
& Francis Ltd. Vol. 31. 2004. 705-711.
-
Dieter Cuypers,
Herbert De Smet and
Andre Van Calster. Fringe-field induced disclinations in VAN LCoS
panels. Proceedings of 11th Internation Display Workshops (IDW).
2004. 1679-1682.
-
Dieter Cuypers,
Herbert De Smet and
André Van Calster. Fringe Field Effects in Microdisplays. Proceedings
of the Society for Information Display 2005 International Symposium, Digest
of Technical Papers. Vol. 36. 2005. 1298-1301.
-
Dieter Cuypers,
Andre Van Calster and
Herbert De Smet. Vcom Drift Phenomena in VAN LCOS Panels. Proceedings
of the 12th International Display Workshops in conjunction with Asia Display
2005. 2005. 1931-1934.
-
H. De Smet,
D. Cuypers,
F.-A. Fernandez and
S.-E. Day. Inter-grey-level response times of a liquid crystal display.
Proceedings of the 25th International Display Research Conference (Eurodisplay
2005). 2005. 294-297.
-
Thierry Borel,
Patrick Morvan,
Khaled Sarayeddine,
Philippe Rommeveaux,
Werner Becker,
Atsutaka Manabe,
Sally Day,
Anibal Fernandez,
Mark Gardner,
Herbert De Smet,
Hugues Lebrun and
Gerard Gomez. A 0.83'' Full HDTV Liquid Crystal On Silicon Component
with In-Pixel Memory and 450Hz Refresh Rate. Proceedings of the Society
for Information Displays International Symposium. Society for
Information Display. Vol. 37. 2006. 1027-1030.
-
Dieter Cuypers,
Herbert De Smet and
Andre Van Calster. Assembly technology for the manufacture of LCOS
panels. Journal of the Society for Information Display. Vol. 14.
2006. 209-216.
-
D Cuypers,
H De Smet and
A Van Calster. Three-dimensional simulation of VAN LC configurations for
advanced LCOS display panels. Proceedings of the 13th International
Display Workshops (IDW06). 2006. 1929-1932.
-
D Cuypers,
A Van Calster and
H De Smet. Behaviour of compensation voltage in LCOS panels.
Proceedings of the 27th International Display Research Conference. 2007.
248-251.
-
D Cuypers,
H De Smet and
A Van Calster. LCOS microdisplay technology for advanced applications
(invited paper). Journal of the SID. Vol. 15. 2007. 775-788.
Consult our complete publication list
|
LED projection
Why use LEDs?
Until recently, ultra high pressure (UHP) discharge (arc) lamps were the only
practical light sources for LCOS projectors, because of their high efficiency
and especially because of the high luminous flux for a given arc dimension. The
latter characteristic is crucial for efficient projection using small light
valves such as microdisplays.
However, due to recent developments, Light Emitting Diodes (LEDs) are getting
much more powerful and efficient and are presently being considered as an
interesting alternative light source in small LCD projection units.
Some very interesting properties of LEDs compared to arc lamps are:
- very long lifetime
- very narrow bandwidth (pure) primary colors, enabling a larger color
gamut
- instant-on (no warm-up needed)
- dimmable for increased (dynamic) contrast
- can be pulsed for e.g. improved motion picture response time (MPRT)
- no Mercury content
- no explosion danger
- shock proof for automotive or airborne use
Because LEDs are very different from arc lamps, none of the existing
projector architectures were readily suited for the incorporation of LED light
sources. Therefore, some years ago, we started studying alternative projector
architectures that would efficiently utilize the light flux coming from LEDs,
although at that time the available LED luminances were still much too low for
actual projector applications.
LED projection research projects
The FWO project "New
optical architectures for LCOS projectors" was a generic research
project dealing with the optical part of a light valve projector. This project
was conducted in cooperation with the photonics group of the
department Tona of the
Vrije Universiteit Brussel. The principal aim
was to invent, simulate, build and evaluate new architectures that would allow
to replace the traditional UHP lamps with LEDs. This project resulted in a
patent application and several publications listed below.
CLEP: The Flemish
IWT project
"CLEP" (Compact high-quality LED projector systems) targeted the creation of a
new innovative technology platform allowing the development of specific LED
projection systems with a minimum light output of 100lm, a high image quality
and limited physical dimensions. This required the design of specific optical
architectures that were different from existing optical architectures for
projectors that use arc-lamps.
Patent application
EP 1578123 A2: Projector system comprising pulsed light sources
LED projection publications:
-
Huseyin Murat,
Herbert De Smet,
Dieter Cuypers,
Y. Meuret,
Hugo Thienpont,
M. Vervaeke and
L. Desmet. Increased lumens per etendue by combining pulsed LED`s.
Proceedings of SPIE, Projection Displays XI. Vol. 5740. 2005. 1-12.
-
Huseyin Murat,
Herbert De Smet and
Dieter Cuypers. Time sharing of pulsed LEDs increases lumen output
within the same etendue. SID Mid-Europe Chapter & Le Club Visu, joint
Spring meeting 2005, Technical presentations. 2005. op CD.
-
Huseyin Murat,
Dieter Cuypers and
Herbert De Smet. Design of new collection systems for multi LED light
engines. Proceedings of SPIE, Photonics in Multimedia. SPIE. Vol.
6196. 2006. 619604/1-619604/11.
-
Huseyin Murat,
Herbert De Smet and
Dieter Cuypers. Compact LED projector with tapered light pipes for
moderate light output applications. Displays. De Smet, H. Elsevier.
Vol. 27. 2006. 117-123.
-
Huseyin Murat,
Herbert De Smet,
Dieter Cuypers,
Youri Meuret,
Hugo Thienpont,
Michael Vervaeke and
Lieven Desmet. Increased lumens per étendue by combining pulsed
light-emitting diodes. Optical Engineering. De Smet, H. SPIE. Vol.
45. 2006. 034002:1-8.
-
Bart Van Giel,
Youri Meuret,
Lawrence Bogaert,
Huseyin Murat,
Herbert De Smet and
Hugo Thienpont. Efficient and Compact Illumination in LED Projection
Displays. Proceedings of the Society for Information Display 2007
International Symposium, Digest of Technical Papers. SID. Vol. 38. 2007.
947-950.
-
Huseyin Murat,
An Gielen and
Herbert De Smet. Gradually tapered light pipes for illumination of LED
projectors. Journal of the Society for Information Display. Andras
Lakatos Society for Information Display. Vol. 15. 2007. 519-526.
Consult our complete publication list
|
e-Paper
Despite the impressive technological evolutions of the last decades, displays
have not yet replaced printed paper. Paper has certain advantages whose
combination appears to be out of reach of all existing display technologies: it
is light, thin, portable and pleasant to read. On the other hand, displays allow
fast and unlimited changing of their image content.
Fact is, there is a need for a technology combining the advantages of both
worlds, and this technology already has a name: electronic paper.
In our group, we have studied one possible technology for the realization of
electronics paper: electrophoretics. This involves the moving of oppositely
charged and colored pigments in a liquid solution between two glass plates under
the influence of an applied electric field. By attracting either black or white
pigments to the viewer side, pixels can be colored black or white.
By performing electro-optical studies of the physical properties of this display
technology, we were able to construct an improved model for its operation. Using
this model, it was possible to optimize the display properties and to get rid of
certain disadvantages.
The results of this study are summarized in the PhD thesis and papers listed
below.
PhD thesis:
Karakterisering en modellering van elektroforetische
beeldschermen ( 2'970'343 bytes)
by Tom Bert
(Dutch + English summary)
e-Paper Publications:
-
T. Bert,
G. Van Steenberge,
H. De Smet,
F. Bruyneel,
J. Doutreloigne,
E. Schroten,
A.A.J. Ketelaars and
G. Hadziioannou. Passive matrix addressing of electrophoretic image
display. Proceedings of the 22nd International Display Research
Conference (IDRC) (Eurodisplay 2002). 2002. 251-254.
-
T. Bert and
H. De Smet. The microscopic physics of electronic paper revealed.
Displays. Elsevier. Vol. 24. 2003. 103-110.
-
T. Bert and
H. De Smet. A new insight in electronic paper: EPID or DEPID?.
Proceedings of The 10th International Display Workshops (IDW `03) . 003. 1621-1624.
-
T. Bert and
H. De Smet. Dielectrophoresis in electronic paper. Displays. Elsevier. Vol. 24. 2004. 223-230.
-
Tom Bert and
Herbert De Smet. How Total Internal Reflection can make Electronic Paper
better. Proceedings of the first Americas Display Engineering and
Applications Conference. 2004. 84-86.
-
Tom Bert,
Filip Beunis,
Herbert De Smet and
Kristiaan Neyts. Transient current properties in electronic paper.
Proceedings of 11th Internation Display Workshops (IDW). 2004.
1749-1752.
-
Tom Bert and
Herbert De Smet. Hexagonal Patterns in Electronic Paper. SID
Mid-Europe Chapter & Le Club Visu, Joint Spring Meeting 2005, Technical
Presentations. 2005.
-
Tom Bert and
Herbert De Smet. Pattern Formation in Electronic Paper. Proceedings
of the Society for Information Display 2005 International Symposium. Vol. 36. 2005. 765-767.
-
Tom Bert,
Herbert De Smet,
Filip Beunis and
Filip Strubbe. Numerical simulation of the transport of particles in
electrophoretic displays. OPTO-ELECTRONICS REVIEW. Vol.
13. 2005. 281-286.
-
Tom Bert,
Jan Vanfleteren,
Bjorn Vandecasteele,
Stefaan Maeyaert,
Jan Doutreloigne,
Jonathan Govaerts,
Herbert De Smet and
Andre Van Calster. Advanced Technologies in Fabrication and
Interconnection of Flexible Displays and Substrates. Proceedings of
Flexible Displays and Electronics (FDE) 2005. 2005. 1-14.
-
Tom Bert and
Herbert De Smet. How to introduce a threshold in EPIDs. Proceedings
of the 25th International Display Research Conference (Eurodisplay 2005).
2005.
-
Filip Beunis,
Filip Strubbe,
Kristiaan Neyts,
Tom Bert,
Herbert De Smet,
Alwin Verschueren and
Luc Schlangen. Electric Field Compensation in Electrophoretic Ink
Displays. Proceedings of the 25th International Display Research
Conference (Eurodisplay 2005). SID. 2005. 344-345.
-
Tom Bert,
Herbert De Smet,
Filip Beunis and
Kristiaan Neyts. Complete electrical and optical simulation of
electronic paper.. Displays. Elsevier. Vol.
27. 2006. 50-55.
-
Tom Bert,
Herbert De Smet,
Filip Beunis and
Kristiaan Neyts. Steady state current in EPIDs. Displays. Elsevier. Vol. 27. 2006. 35-38.
Consult our complete publication list
|
Wavelet display driving
Combined display driving and wavelet-based decoding is a feasible concept to
minimize power consumption in mobile video devices. We had a fruitful
interdisciplinary collaboration with
VUB-ETRO to tackle this
ambitious goal. Research towards the combined wavelet decoding of moving images
and display driving of passive matrix displays architecture has shown that new
scalable video-coding structures allow us to integrate a passive matrix display
driving architecture into the IDWT (inverse discrete wavelet transform) block of
the scalable video coding framework. This integration leads to reduced power
consumption for portable communication terminals, as shown in the publications
listed hereunder.
Wavelet driving Publications:
-
San Lam,
Herbert De Smet,
Fabio Verdicchio and
Adrian Munteanu. Wavelet based moving picture coding multiple line
addressing for passive matrix displays. Proceedings of the 25th
International Display Research Conference (Eurodisplay 2005). 2005.
309-311.
-
Ingrid Moerman,
Piet Demeester,
Daniel De Zutter,
Hendrik Rogier,
Herwig Bruneel,
Marc Moeneclaey,
Heidi Steendam,
Sabine Wittevrongel,
André Van Calster,
Herbert De Smet,
Rik Van de Walle,
L Vandendorpe,
G Leduc,
J Cornelis,
P Schelkens,
M Moonen,
G Latouche,
M-A Remiche and
C Blondia. The IAP-MOTION project: mobile multimedia communication
systems and networks. Proceedings of the 12th Annual Symposium of the
IEEE/CVT, Symposium on Communications and Vehicular Technology in the
Benelux (SCVT2005) - ISBN 90-365-2264-1 2005. 2005.
-
San Lam and
Herbert De Smet. Frame Resolution Scalability in Wavelet Based Multiple
Line Addressing for Passive Matrix Displays. Society for Information
Displays 2006 International Symposium Digest of Technical Papers. Vol.
37. 2006. 355-358.
-
San Lam and
Herbert De Smet. Hardware architecture of a wavelet based multiple line
addressing driving system for passive matrix displays.. Proceedings of
the 7th International Meeting on Information Display (IMID’07). Vol. 7.
2007. 802-805.
-
San Lam,
Fabio Verdicchio,
Herbert De Smet and
Adrian Munteanu. In-band scalable video coding with integrated
wavelet-based display driving . Journal of the Society for Information
Display. Vol. 15. 2007. 237-250.
Consult our complete publication list
|
Microdisplays are displays that are
so small that magnifying optics are
needed to use them. Usually they consist of a CMOS chip which contains a
2-dimensional array of transistors (one per pixel, just like in a TFT
display), with on top of every transistor a pixel electrode that also acts
as a mirror. In combination with a suitable liquid crystal material and a
cover glass this yields a reflective LCD ("Liquid Crystal On Silicon
- LCOS"). Microdisplays can be used in
projectors, in head-mounted displays, view-finders or other lens-view
display systems.
Research History (subpage)
Private area