Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly
Patent
1993-02-12
1994-08-09
Ramsey, Kenneth J.
Electric lamp or space discharge component or device manufacturi
Process
With assembly or disassembly
313586, 445 58, H01J 900, H01J 190
Patent
active
053361210
DESCRIPTION:
BRIEF SUMMARY
The invention relates to display screens of the plasma panels type, and more particularly electrically insulating elements used in these devices.
Plasma panels (abbreviated to "PP") are flat display screens which operate according to the principle of luminescent discharges in a gas. They comprise two insulating plates assembled together so as to define between them a calibrated space. This space is closed in a leaktight manner at the periphery of the plates in order to form a gaseous space.
The electrical discharges in the gas are obtained using electrodes to which electrical voltages are applied. The electrodes may be distributed on either side of the gaseous space: in this the most common case, a network of electrodes is carried by one plate and at least one other network of electrodes is carried by the other plate. The two networks are orthogonal with respect to each other, and one elementary cell or pixel is defined at each intersection of electrodes. But the electrodes may also be disposed on the same side with respect to the gaseous space, that is to say be carried by the same plate.
Various types of plasma panels exist, in particular panels of the type operating with continuous voltage and the so-called "alternating" panels. The alternating panels have the advantage of having a memory effect which allows useful information to be addressed only to the pixels whose state (lit or extinguished) it is desired to change; on the other pixels, the state of the latter is simply maintained by repetition of alternate electrical discharges, called maintaining discharges. This memory effect is obtained by electrically insulating the electrodes from the discharge gas, covering them with a dielectric layer on which the charged particles generated by the discharge in the gas accumulate.
An explanation of the operation of an alternating-type panel is found in an article by G. W. Dick published in PROCEEDING OF THE SID, volume 27/3 1986, pages 183-187. The structure described in this document more particularly relates to a structure of the type with coplanar maintenance. Three electrodes are used in this type of panel in order to define a pixel: two parallel and coplanar electrodes produce the maintaining discharges in each pixel; the coplanar electrodes intersect with so-called addressing electrodes, whose operation is generally solely to produce the addressing in cooperation with one of the coplanar electrodes. It is to be noted that the abovementioned document furthermore mentions the use of discharge barriers whose function is to separate the discharges produced in contiguous cells.
Such discharge barriers may also be used in "PPs" whose cells or pixels are formed at the intersection of only two electrodes, and their presence is practically indispensable in "PPs" of the "continuous" type.
Whatever the type of "PP", the discharge barriers may consist of pieces forming thickness wedges, called spacers, which define the height of the gaseous space.
The function of such spacers is illustrated by the figure which shows a plasma panel of the type with two electrodes which intersect in order to define a cell or pixel. The figure is a sectional view parallel to one of these two electrodes.
The panel 1 comprises two plates 2, 3 each carrying a network of electrodes. The plates 2, 3 constitute substrates, they normally have a thickness E1 of the order of 1 to 6 mm.
The first plate 2 carries a first network of parallel electrodes Y1 to Yn. The second plate 3 carries a second network of parallel electrodes represented by an electrode X (represented parallel to the plane of the figure) orthogonal to the electrodes Y1 to Yn.
On the first plate 2, the electrodes Y1 to Yn (seen in their cross section) are covered with a dielectric layer 4, whose thickness E2 is usually of the order of 20 to 30 microns.
The dielectric layer 4 is covered with a protective layer 5 often of MgO whose thickness is very small, of the order of 0.2 microns.
On the second plate 3, the electrodes X of the second network are covered by a second dielectric
REFERENCES:
patent: 3931436 (1976-01-01), Kupsky
patent: 3953756 (1976-04-01), Monfroy et al.
patent: 4803402 (1989-02-01), Raber et al.
patent: 5011391 (1991-04-01), Kawasaki
patent: 5209688 (1993-05-01), Nishigaki et al.
Ramsey Kenneth J.
Thomson Tubes Electroniques
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