Document Viewer Prototype
Principal Investigators - J.W. Doane, J.L. West, D.K. Yang
electronic document viewer prototype display featuring a low-power,
reflective display technology was invented in the ALCOM Center
and developed further with the support of ARPA and an industrial
partner, Kent Displays, Inc.
Using stabilized cholesteric liquid crystals, the display is the first of its kind with page-size, ultra-high resolution, bistable memory capabilities on a passive matrix (low cost) without need of a backlight. The technology is being developed for a lightweight, paper-like viewer for electronic newspapers, books, and document viewing. Software was provided by Knight-Ridder.
Image size: 8 1/2" x 11"
Resolution: 100 dpi
No active matrix
Manuals and Maps
Principal Investigators - J.L. West
Liquid Crystal Institute is a leader in the development of high
resolution displays on plastic substrates. The figure shows one
of the world's first plastic high-resolution displays.
The LCI's reflective display technologies are well-suited for low-cost plastic substrates since they do not require polarized light. Such developments are important for lightweight, paper-like displays for hand-held display applications.
One of the benefits of this technology is that it can utilize mylar, an easily available, inexpensive plastic. Mylar is more durable than previously used materials, making it a practical alternative to glass for use in large-size, portable displays.
Active Matrix Display
Principal Investigator - J.W. Doane
researchers have succeeded in producing a video-rate flat panel
display based on a novel liquid crystal technology called reverse-mode
PSCT (Polymer Stabilized Cholesteric Texture). The display does
not require polarizers as do traditional liquid crystal displays.
A picture element (pixel) is either transparent so that the background
can be seen or scatters light as paper does.
Like conventional high-resolution liquid crystal displays, it requires active matrix addressing. Each pixel contains a MIM (metal insulator metal) element, replacing the transistor in conventional TFT displays.
||The advantage of using the MIM elements is that they require less area, so that the actual pixels can be larger, contributing to brighter images. This technology can display information at the same speed as a computer monitor. One possible use is in heads-up displays in automobiles, where the car instrument panel is projected on the windshield.|
Cholesteric Diffraction Grating
Principal Investigator - Oleg D. Lavrentovich
| U=0 V,
| U=4 V,
(0.6-60 micron period)
| U=6 V,
|D.Subacius, S. Shiyanovskii,
P. Bos and ODL, Appl.Phys.Lett. 71, 1350 and 3323
S. Shiyanovskii, D. Voloschenko, ODL, Proc. SPIE 3475, 56 (1998)
ODL, S. Shiyanovskii, D. Voloschenko, Proc. SPIE 3787, 149 (1999)
pattern on a screen