JPH0119319Y2 - - Google Patents

Description

[Detailed description of the invention] The invention is based on a method in which a gas medium is filled in a discharge space formed by orthogonally facing a group of band-shaped electrodes covered with a dielectric film, and an alternating current voltage is applied between the facing electrodes. This invention relates to a dot matrix type plasma display panel that performs luminescent display.

Conventional dot matrix type plasma display panels are driven by applying alternating current voltage to one of the opposing strip electrode groups in a time-divided manner and sequentially scanning the remaining strip electrode group. In this method, a desired display pattern is obtained by selectively applying an AC voltage of opposite phase in synchronization with the timing of the sequential scanning described above. For this reason, as the number of electrodes is increased for the purpose of increasing the display capacity, the scanning time per electrode, that is, the display time decreases, resulting in a decrease in display brightness. In order to compensate for this drawback, it is necessary to provide the plasma display panel with a memory effect and to ensure that each strip electrode is selected for a sufficiently long time.

An object of the present invention is to provide a plasma display panel that has a memory effect by utilizing the fact that the discharge sustaining voltage is lower than the discharge starting voltage.

According to the present invention, a substrate having a first electrode group covered with a dielectric film and a second electrode group covered with a dielectric film are provided.
a pair of substrates having electrode groups of
A discharge space filled with a discharge medium is formed by making the electrode group and the second electrode group face each other via an insulating spacer, and an alternating current voltage is applied to the first electrode group and the second electrode group. In a plasma display panel in which a display area is formed by causing a discharge medium to emit light, the first and a dielectric located substantially parallel to the extending direction of each electrode of one electrode group of the second electrode group, and between each electrode of one electrode part and facing the other electrode group. A plasma display panel is obtained, characterized in that it has a third electrode covered with a body.

Next, a drawing is shown for an embodiment of the present invention,
explain.

FIG. 1 is a sectional view of a plasma display panel according to the present invention. A transparent electrode 3, a spacer 5, an electrode 8 which is a third electrode according to the present invention, and a dielectric layer 9 were successively formed on a glass substrate 1.

Transparent electrodes were fabricated by chemical vapor deposition
A SnO ₂ :Sb film (~8000 Å) was used. The spacer 5 was formed by mixing an insulating powder containing aluminum oxide as a main component with an organic binder, forming a paste, and screen-printing the mixture to a thickness of 50 μm.

For the electrode 8, a thick silver film having a thickness of 10 μm was used by screen printing silver paste. The dielectric layer 9 was formed by spraying and firing lead glass powder together with an organic binder.

On the other hand, a back electrode 4, a dielectric layer 7, and a spacer 6 were formed in this order on the glass substrate 2. The back electrode 4 was formed in the same manner as the electrode 8, and the spacer 6 was formed in the same manner as the spacer 5. The dielectric layer 7 was formed by screen printing a paste made by mixing lead glass and an organic binder.

When the glass substrate 1 and the glass substrate 2 having the various layers formed as described above are placed opposite each other so that the transparent electrode 3 and the back electrode 4 are perpendicular to each other, a discharge space which is the display area 10 is formed. Further, a third electrode 8 is formed at an intermediate position in this discharge space, that is, at a position approximately equidistant from the transparent electrode 3 and the back electrode 4 as shown.

FIG. 2 schematically shows the positional relationship of this constructed electrode group. The transparent electrodes are indicated by 3 ₁ to 3 ₈ , the back electrodes are indicated by 4 ₁ to 4 ₁₃ , and the third electrodes are indicated by 8 ₁ to 8 ₈ . The operating principle of the plasma display panel of the present invention thus obtained will be described below.

In the discharge space 10 configured as described above,
Ne gas having a gas pressure that minimizes the discharge starting voltage between the back electrode 4 and the third electrode 8 is selected from the Patsien curve and sealed. Note that the minimum discharge starting voltage between the back electrode 4 and the third electrode 8 determined in this way is hereinafter defined as V _W.

In this state, in order to apply an alternating current voltage between the transparent electrode 3 and the back electrode 4 to cause a discharge, a voltage sufficiently higher than the discharge starting voltage is required. Here, the discharge starting voltage is the voltage at which the enclosed Ne gas starts to discharge and emit light.

By the way, in synchronization with the application of this AC voltage, when a voltage pulse is applied to the electrode 8 that causes a discharge between the third electrode 8 and the back electrode 4, ionized Ne ⁺ and electrons or photons are discharged due to this discharge. As a result, the discharge starting voltage of the electrodes 3 and 4 decreases, and a discharge occurs and is maintained at a voltage lower than the discharge starting voltage. Hereinafter, the voltage that maintains the discharge between the electrodes 3 and 4 will be defined as V _S , and the discharge starting voltage will be defined as V _C . The above-mentioned matter will be specifically explained using FIGS. 2 and 3. An AC voltage of voltage V _S /2 sufficient to maintain discharge in the discharge space 10 between the transparent electrode 3 and the back electrode 4 is always applied to the transparent electrodes 3 ₁ to 3 ₈ . Now, consider a case where two points selected by electrode 4 ₁ and electrode 3 ₁ and electrode 4 ₁ and electrode 3 ₇ are displayed. Electrode 4 ₁ ~ 4 ₁₃
An alternating current voltage of voltage V _S /2 is applied to the transparent electrodes 3 ₁ to 3 ₈ in reverse phase, and a voltage V _A is superimposed only on the electrode 4 ₁ . On the other hand, an AC voltage of voltage V _B is applied to the third electrodes 8 ₁ and 8 ₇ in the same phase as the electrodes 3 ₁ to 3 ₈ ,
Moreover, the electrodes 8 ₂ to 8 ₆ and 8 ₈ are grounded. (However, the magnitude relationship of the applied voltages above is as follows: V _S /2 + V _A + V _B > V _W · V _S /2 + V _A < V _W and V _S + V _A < V _C. ) V _S /2 + V _A + V _B > _VW ensures that discharge occurs at electrodes 4 and 8.

Further, V _S /2+V _A <V _W ensures that no discharge occurs between the third electrode 8 and the electrode 4 when V _B is not applied to the third electrode.

Moreover, V _S +V _A <V _C means that the third electrode 8 and the electrode 4
This guarantees that no discharge occurs between the electrodes 3 and 4 when there is no discharge between the electrodes 3 and 4. When voltage is applied to each electrode in this way, the transparent electrodes 3 ₁ to 3
A voltage V _S sufficient to maintain discharge is applied between 3 ₈ and the back electrodes 4 ₁ to 4 ₁₃ , and the third electrode (electrode 8
₁ , 8 ₇ ) and the back electrode (electrode 4 ₁ ) is applied, and a voltage V _W sufficient to start a discharge is applied between the electrode 8 ₁ and the electrode 4 ₁ and between the electrode 8 ₇ and the electrode 4 ₁ . starts. Due to this discharge, discharge is induced between the transparent electrode 3 ₁ and the back electrode 4 ₁ and between the transparent electrode 3 ₇ and the back electrode 4 ₁ so that only the two selected points are displayed. As described above, each of the back electrodes 4 ₁ to 4 ₁₃ is sequentially
In synchronization with superimposing the voltage of V _A , the third electrode 8 ₁
If a voltage of _VB is selected and applied between 8 and ₈ , discharge display can be started at a desired point. After starting the discharge in the desired pattern,
By keeping the third electrodes 8 ₁ to 8 ₈ grounded and applying a discharge sustaining voltage _VS between the transparent electrodes 3 ₁ to 3 ₈ and the back electrodes 4 ₁ to 4 ₁₃ , a desired pattern can be displayed. can be maintained.

In this way, in this example, since the plasma display panel was able to have a memory effect, it is no longer necessary to scan the electrodes in time divisions as in the past, and the problem of decrease in brightness due to increase in display capacity is eliminated. I was able to solve it.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a plasma display panel according to the present invention. FIG. 2 is a schematic diagram of the electrode arrangement of a plasma display panel according to the present invention. FIG. 3 shows the voltage waveforms applied to each of the electrodes shown in FIG. In the figure, 1, 2... glass substrate, 3, 3 ₁ ,
3 ₂ ... 3 ₈ ... transparent electrode, 4, 4 ₁ , 4 ₂ , ... 4 ₁₃ ...
... Back electrode, 5, 6 ... Spacer, 7, 9 ... Insulator layer, 8, 8 ₁ , 8 ₂ ... 8 ₈ ... Third electrode, 1
0...discharge space.

Claims (1)

[Scope of utility model registration request] A substrate having a first band-shaped electrode group covered with a dielectric film and a substrate having a second band-shaped electrode group covered with a dielectric film are combined into a first band-shaped electrode group and a second band-shaped electrode group. A discharge space is formed at the intersection of the first and second electrode groups, which are opposed to each other so that they are substantially orthogonal to each other.
In the plasma display panel, at a position approximately equidistant from the first band-shaped electrode and the second band-shaped electrode group in the discharge space, and of one of the first and second electrode groups. a third electrode group covered with a dielectric film, which is substantially parallel to the extending direction of each electrode and located between each electrode of the one electrode group and facing the other electrode group; A plasma display panel characterized by having the following.