Patent GB-1004315-A (GB)
Title: Electroluminescent display panels
Inventor: ACTON JOHN REGINALD
IPC: H05B33/26
Filed: 1959-12-09
Abstract: <PICT:1004315/C4-C5/1> <PICT:1004315/C4-C5/2> <PICT:1004315/C4-C5/3> <PICT:1004315/C4-C5/4> <PICT:1004315/C4-C5/5> An electroluminescent display panel for showing a plurality of parameters, such as temperature and pressure in different reaction chambers, includes a number of electroluminescent display elements each positioned in a co-ordinate array at a cross-point of an electrical conductor of a column set of conductors and an electrical conductor of a row set of conductors, each element being one of two types, of which the first type appears only at the cross-points of alternate column conductors and alternate row conductors, and the second type appears only at the cross-points of the remaining column conductors and the remaining row conductors.  The panel can include two further types of display elements, of which one appears alternately with the first type of element in rows in which the first type appears, and the other appears alternately with the second type of element in rows in which the second type appears.  An example of a display panel is shown in Fig. 2 of Provisional Specification 41817/59, which utilizes four types of display elements for displaying four variables. Larger numbers of types of display elements can be used.  In the arrangement shown in Fig. 2 of Provisional Specification 1820/60, patches B of blue-emitting phosphor, patches Y or yellow-emitting phosphor and patches O of insulator are utilized.  The patches O can be of a plain resin or of a resin with a non-luminescent filler, such as titanium dioxide.  More than two types of phosphor can be used.  A display element can emit light of a colour characteristic of its type, the colour being determined by the composition of the phosphor layer or by a layer of colour-determining material through which the emitted light is passed.  In a further arrangement, a display element emits light of an intensity characteristic of its type.  In a further arrangement a display element exhibits a configuration characteristic of its type.  The configuration of a display element can be determined by a perforation in a screen or by the shape of an electric conductor of at least one of the sets of conductors at the cross-point at which the element is positioned as shown in Figs. 2, 4 and 5 of Provisional Specification 8086/60. Combinations of the above arrangements can be used. One or other of the array conductors can be modified to show letters of the alphabet or figures, or arrays in which some or most of the intersections of the conductors take the form of rectangles while at least one of the remaining intersections is provided with a modified conductor of any of the above forms can be used. The conductors at their intersections are shaped in a repetitive pattern.  Two or more differently shaped sets of intersections can be provided to form two or more separate concurrent displays.  The intersections can display the same colour or can differ in colour and shape. The crossed conductors can be of cartesian, trilinear, circular or elliptical form.  Transparent etched sputtered cadmium oxide can be used for the conductors.  Both back and front conductors can be transparent to allow for photographic methods of reproducing the display as described in Specification 992,939.