Improvement In Multi-Line Addressing

Latest news (2006)- BlueVu and Kodak experiment with passive OLED pixels and find that they will demodulate then filter row and column frequencies, making passive EL and OLEDs a new platform for Signal Display's patented method (Demo Pic). SDSI presents OFDM display technology at Yet2's 2005 annual confernce:(Conference Presentation TekPack). The standard method of refreshing displays is a single-line
approach until the whole display is updated. In this age where
demands for resolution are higher (HDTV and Virtual Reality),
the standard, line-by-line method will simply be too
slow to show full rate video and graphics for most applications. SDSI has
developed and patented a method that REFRESHES ALL PIXELS IN THE DISPLAY
SIMULTANEOUSLY - no waiting for previous lines to finish. Every
line in the display is updated simultaneously and the rate at which video
or graphics can be shown is not limited by the resolution of the display.
By driving all rows and columns in parallel, we refresh a display at lower
bandwidths than is normally possible. With this method, a 1920 x 1080 display
at 60 frame/sec can be refreshed with driver signals less than 1 MHz in bandwidth.
The row signals are a Fourier-series of amplitude-modulated column frequencies. (Technical Details and Diagrams)

In many displays, such as EL or OLED, it is possible to use the natural, built in demodulator at each pixel without any modifications to the display. The pixel turns on when the intersecting row and column frequencies are equal or in some cases different.

It is literally the way nature would design a display, with parallel processing
architecture that has low-bandwidth requirements and is therefore inexpensive.
By integrating only two gates per LC cell into the substrate
of a microdisplay or by using a standard passive EL display without modifications, the additional cost of implementing this new video
technology is negligible when calculated for high-volume production. Also,
because the signals driving the display are so low in frequency the power
consumption is correspondingly much lower. Lawrence Tannas, Jr. of Tannas
Electronics (www.tannas.com) a recognized authority on display technology has
said regarding this method, "There are only five classical ways to address
a matrix flat panel display and until your invention only one called
'Active Matrix Addressing' that addresses all the rows and columns in
parallel...I do believe that the technique of the patent is a fundamental
contribution to the art of matrix addressing." Frequency Multiplexing is a
significant improvement over Active Addressing, allowing for any frame-rate
and resolution to be obtained in an active-matrix display. SDSI has developed
LED display modules avialable for licensing (View 16 RGB pixel demo).
We believe that Frequency Multiplexing will eliminate the Virtual in
Virtual Reality. Please contact us for more details.