Bi-substrate plasma panel

Details Bi-substrate plasma panel Bi-substrate plasma panel

1999-09-20

2000-09-26

Philogene, Haissa

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

313238, 313292, 313268, 345 37, 345 55, 345 60, G09G 310

Patent

active

06124676&

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to colour plasma display panels, of the two-substrate alternating type, with improved light efficiency.
2. Discussion of the Background
Plasma panels suffer from a lack of electroptical performance compared with cathode-ray tubes, this being so whatever the production technique employed.
Colour plasma panels of the two-substrate alternating type operate on the principle of an electrical discharge in the gases and they use only two crossed electrodes, laying on different substrates, to define and control a discharge.
FIG. 1 shows such a plasma panel of the prior art. It comprises two substrates of tiles 2, 3, one of which, called the front tile 2, lies on the same side as an observer (who is not illustrated). This front tile 2 carries a first array of electrodes, called row electrodes, only two of which, Y1, Y2, are illustrated. The row electrodes Y1, Y2 are approximately parallel and spaced apart with a spacing py. The row electrodes Y1, Y2 are covered with a layer 5 of a dielectric material.
The second tile 3 or so-called rear tile is on the opposite side form the observer; it carries a second array of electrodes called column electrodes, only five of which, X1 to X5, are illustrated. The column electrodes X1 to X5 are approximately parallel and spaced apart with a spacing px. The spacing px is about one third of the spacing py and may be between, for example, 100 .mu.m and 500 .mu.m depending on the definition of the image.
The two tiles 2, 3 are generally made of glass. They are intended to be joined together so that the row electrodes Y1 to Y2 are approximately perpendicular to the column electrodes X1 to X5. Once they have been joined together, the two tiles 2, 3 define a space 13 which is intended to be filled with gas. The gas used is generally a neon-based gas.
The thickness H0 of the space 13 between the front tile 2 and the rear tile 3 must be as precise as possible, in order to obtain homogeneous discharges.
On the rear tile 3, the column electrodes X1 to X5 are also covered with a layer 6 of dielectric material. The dielectric layer 6 is itself covered with several groups of three phosphor stripes B1, B2, B3 corresponding, for example, to the colours green, red and blue, respectively. The phosphor stripes B1, B2, B3 are approximately parallel to the column electrodes X1 to X5. They have approximately the same spacing px as the column electrodes X1 to X5. One column electrode, for example X1, therefore lies beneath a phosphor stripe B1, approximately in the middle of it.
In general, the rear tile 3 also includes an array of barriers 11 approximately parallel to the column electrodes X1 to X5 and separated by the spacing px. They separate two adjacent phosphor stripes B1, B2. Their height H1 is generally less than the thickness H0 of the space 13 between the front tile 2 and the rear tile 3.
Two electrodes X1, Y1 lying on different tiles 2, 3 can include a discharge in the gas if they are at appropriate potentials. The discharge region has a cross section which corresponds approximately to the area facing the two opposed electrodes X1, Y1.
For the purpose of reducing the voltages to be applied to the electrodes in order to obtain a discharge, it is necessary to cut out holes or recesses Ep1, Ep2, Ep3, etc. in the phosphor stripes B1, B2, B3, in the surface facing between a row electrode Y1 and a column electrode X1. These recesses Ep1, Ep2 confine the discharge.
Conventionally in colour panels, three neighbouring recesses Ep1, Ep2, Ep3, level with the same row electrode Y1 but in three adjacent phosphor stripes B1, B2, B3, are used to form a trichromatic pixel P which can adopt a great number of colours.
The recesses Ep1, Ep2, Ep3 of the same pixel P are therefore aligned with the same row electrode Y1 and are separated by a distance equal to the spacing px.
To improve the contrast, the front tile 2 is often provided with a black matrix 4 in a form of black stripes extending between two row electrodes Y1, Y2. The

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