Unbalance vector display device and process

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS FIG.
1 illustrates a sectional view of a portion of one embodiment of an unbalance information display panel according to the invention.
The panel may be held together by frame means which as such are conventional or by gluing which is also conventional.
The panel comprises a base plate 1 which is preferably made of transparent material, such a glass or acrylic glass.
A raster 2 of parallel electrodes is secured to one face of the base plate 1.
The manufacturing of such electrode rasters is conventional and could, for instance, be accomplished by printed circuit techniques.
A cover plate 3 also carrying a raster 4 of electrodes is juxtaposed relative to the base plate so that the electrodes face each other and are arranged to cross each other preferably at right angles.
The base plate 1 and the cover plate 3 are spaced from each other by conventional spacer means not shown for simplicity's sake.
The space between the base plate 1 and the cover plate 3 is filled by liquid crystal material 6.
As mentioned, in the simplest embodiment the electrodes 2 and 4 are disposed to form an orthogonal grid as shown in FIG.
2.
The cover plate 3 is also made of transparent material such as glass or the like.
According to the invention a dial 5 is secured to the outside of the cover plate 3.
The dial 5 may, for example, be etched or printed on the surface of the cover plate 3.
Where a polar coordinate display is desired the dial comprises a plurality of concentric circles, whereby the spacings between adjacent circles may be calibrated for directly indicating the quantity of a displayed information relative to a coordinate origin.
The dial 5 may also be provided in the form of a rectangular coordinate system, or even in the form of an oblique angle coordinate system.
If desired, the dial 5 may also be provided merely as a portion or portions of a complete coordinate system, whereby for instance the origin of the coordinate system may be suppressed.
Since the liquid crystal material 6 is located in the space between the electrodes 2 and 4 a suitable voltage corresponding to the unbalance information to be displayed is selectively applied to the respective row and column electrodes 2 and 4 for the display of such information by activating the corresponding liquid crystal cell located at the crossing of two electrodes selectively energized