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Method and apparatus for amplitude band enabled addressing arrayed elements
| Details |
Inventors: Rindal, Abraham E.;
Assignee: Sun Microsystems, Inc. (Mountain View, CA)
Primary Examiner: Luu; Matthew
Assistant Examiner: Piziali; Jeff
Attorney, Agent or Firm: Flehr Hohbach Test Albritton & Herbert LLP
Arrayed display pixels are coupled such that all row pixels are coupled together by a row conductive element and all column pixels are coupled together by a column conductive element. The row-coupled pixels are driven by first and second row drivers and the column-coupled pixels are driven by first and second column drivers, a total of four drivers in all. The drivers each output time-varying signals of different frequencies. The vertical scan rate is determined by the frequency differential in the signals output by the two row drivers, and the horizontal scan rate frequency is determined by the frequency differential in the signals output by the two column drivers. The absolute frequencies of the four signals are set proportional to the propagation delay of the medium through which the driver signals travel. The invention implements a pixel enabling signal using the beat-frequency difference between two driver source signals that propagate through a pixel string from opposite ends of the string. The driver difference signal dwells sufficiently long on each pixel location to deliver sufficient energy to turn the pixel on or off. Video information to be displayed is used to modulate at least one of the row drivers and one of the column drivers. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG.
2 depicts an array 100 as comprising a plurality of pixels (again shown as squares) that are arranged along a y-axis in M rows and along an x-axis in N columns.
Similar to FIG.
1, the M.
times.
N pixels are identifiable by their co-ordinates, e.
g.
, pixel (1,1), pixel (2,1) through pixel (X.
sub.
M,Y.
sub.
N).
However, in array 100, each horizontal pixel is coupled together by a common row conductive element 200, and each vertical pixel is coupled together by a common column conductive element 300.
By "coupled together" it is meant that electromagnetic energy carried by the conductive element is coupled to the pixels.
Such coupling may be ohmic, e.
g.
, a direct electrical connection between the conductive element and pixels, or non-ohmic in that it suffices that the energy transfer occurs, perhaps by electrostatic coupling or otherwise.
In FIG.
2 row conductive element 200 is drawn in phantom to make it more readily distinguished from column conductive element 300.
In the embodiment shown, conductive elements 200 and 300 are each serpentine-like in shape and will have a known end-to-end length determined by the physical dimensions of array 100.
The physical dimensions of array 100, in turn, are affected by the individual pixel size and the spaced-apart distance between pixels.
The row-coupled pixels are driven by first and second row drivers (DX.
sub.
1, DX.
sub.
2) coupled respectively to the first and second ends of the row conductive element 200.
Similarly, column-coupled pixels are driven by first and second column drivers (DY.
sub.
3, DY.
sub.
4) coupled respectively to the first and second ends of the column conductive element 300.
As explained herein, a total of only four drivers (DX1, DX2, DY3, DY4) is used to address the M.
times.
N elements in the array.
Each driver outputs a time-varying signal of a different frequency, and the driver signals propagate through the associated conductive element.
Thus, driver DX1 outputs a driver signal f1(.
omega
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