JPS6070633A - Face discharge type gas discharge panel - Google Patents

Abstract

PURPOSE:To reduce the number of panel outlet terminals as well as to aim at a reduction in the number of driving circuits and working elements, by forming one side of display electrode groups into a state of floating, while making these electrodes into a state of capacitive coupling to both group selective driving and group inner position selective electrodes for matrix driving. CONSTITUTION:Each of driving electrodes 3 and 4 is formed on the surface of a glass base plate 1, besides a float electrode 2. A float electrode 5 on the other side running in a direction crossed with the electrode 2 is formed on an insulating layer 7 made up of embedding the electrode 2, while its end parts 5a and 5b are designed so as to intersect these driving electrodes 3 and 4 via an insulating layer 6. Therefore, the float electrode 5 is alternatingly coupled with these driving electrodes 3 and 4 with capacity C1 between electrodes at its 5a and 5b sides. A surface of the float electrode 5 is covered with another insulating layer 8, and a discharge stabilizing protective layer 9 consisting of magnesium oxide or the like is formed on the surface, then the circumference of the display surface is covered with a seal 11 and a glass sheet 12 so that discharge gas 10 is filled up in a blockade space.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a surface discharge type gas discharge panel, and particularly aims to simplify the drive circuit by adopting a float electrode structure.

Conventional technology and problems A gas discharge panel (FDP) has one group of electrodes (X electrodes) arranged on the upper substrate, the other group of electrodes (Y electrodes) arranged on the lower substrate, and these The basic format is to have a gas filled between the upper and lower substrates, drive the X and Y electrodes in a matrix, and cause the gas at the selected intersection of the X and Y electrodes to emit light. The X and Y electrodes may be exposed or may be insulated with an insulating layer or the like, and the former is called a direct current type, and the latter is called an alternating current type.

Further, although the above type of gas discharge panel is called a counter electrode type, a surface discharge type gas discharge panel has also been developed. This is an X electrode and a Y electrode on one substrate via an insulating layer.
A group of electrodes is provided, gas is filled between the hot substrate and a separately provided transparent substrate, and light emission is caused by the leakage of the electric field generated at the intersection of the selected X and Y electrodes. In a facing electrode type gas discharge panel, it is necessary to accurately attach the upper and lower substrates with a small gap between them, and to seal the area around the gap to allow gas to fill inside. There is no particular need for the precision of the spacing between the electrode substrate and the transparent electrode to be a problem. Therefore, assembly is easy. Further, gas discharge panels are designed to be colored, using phosphors that emit colored light, but phosphors deteriorate significantly when subjected to ion bombardment. However, in the facing electrode type, the X electrode side substrate,
Ionization occurs on both Y-electrode side substrates, and no matter which substrate is coated with the phosphor, deterioration due to the ionized area cannot be avoided. In this regard, in the surface discharge type, ionization occurs on the electrode substrate side and not on the transparent electrode side, so if a phosphor is coated on this transparent electrode side, deterioration due to ion bombardment can be significantly improved.

By the way, each intersection of the X and Y electrodes of a gas discharge panel becomes a light emitting point (dot), so in order to construct a large screen with high resolution, a large number of intersections and hence X.

Requires Y electrode. Conventional gas discharge panels are provided with a drive circuit for each electrode, but this has the disadvantage that the number of drive circuits becomes extremely large as the screen becomes larger and higher in resolution. In addition, the voltage applied to the x and Y electrodes is 90 to 10
0.0, the surface discharge type has a voltage of 130 to 150 V, and requires high-voltage circuit elements, which has the drawback of being expensive. Regarding electrode drive, a float electrode method is being considered that reduces the number of drive circuits by multiplexing the electrodes on at least one side, but the conventional float electrode method is for opposed electrode type gas discharge panels, and is not suitable for surface discharge type panels. It's not a thing.

As mentioned above, the counter electrode type is disadvantageous for coloring.

OBJECTS OF THE INVENTION The present invention attempts to solve the above problems by employing a float electrode in a surface discharge type gas discharge panel.

Structure of the Invention The present invention provides a surface discharge type device in which a discharge gas is sealed between opposing substrates, and one display electrode group and the other display electrode group are arranged crosswise on one substrate side with an insulating layer interposed therebetween. This gas discharge panel is characterized in that at least one of the display electrode groups is floating and capacitively coupled to the group selection drive electrode and the intragroup position selection drive electrode for matrix drive. This will be explained in detail with reference to an example.

Embodiment of the Invention FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line xx'. In these figures, numeral 2 indicates a glass substrate, and 2 indicates one display electrode (Y electrode) formed on the surface thereof. In addition to this, drive electrodes 3 and 4 are formed on the surface of the glass substrate 1. Reference numeral 5 denotes the other display electrode (X electrode or float electrode) running on the insulating layer 7 formed by filling the electrode 2 in a direction crossing the electrode 2, and its ends 5a and 5b are driven through the insulating layer 6. It intersects with electrodes 3 and 4. Therefore, the float electrode 5 is AC-coupled with the drive electrode 3.4 through the inter-electrode capacitances CI and C2 on the ends 5a and 5b. A plurality of electrodes 4, in this example four adjacent float electrodes 5, are opposed to each other;
The book electrode 3 faces its individual float electrode 5 .

Note that since the electrode 5 facing the outer electrode 3 crosses over the inner electrode 3, capacitive coupling should not occur in this portion. Since the capacitance value is determined by the area, spacing, and dielectric constant, by selecting these, it is possible to prevent capacitive coupling from occurring at the electrode facing portion. For example, if the electrode 4 is made wide as shown in the figure and the electrode end 9IS5b extends long into this wide part, the opposing area becomes large and capacitive coupling occurs. On the electrode 3 side, when the electrode end 5a widens along one of the electrodes 3 (extending in the direction perpendicular to the paper plane in the drawing), the electrode 5 is capacitively coupled to one of the electrodes 3, and the other Electrode 3
There will be no capacitive coupling with. 8 is an insulating layer covering the surface of the float electrode 5; 9 is a discharge stabilizing protective layer made of magnesium oxide or the like formed on the surface; 11 and 12 are the display surface (the entire area where electrodes 2 and 5 intersect); The closed space is filled with discharge gas 10 by a surrounding seal and a glass plate (transparent base). That is, this gas discharge panel is of a surface discharge type.

Fig. 3 (al is an explanatory diagram of the electric field generated at the intersection (one pixel) of electrodes 2 and 5. When a voltage is applied between electrodes 2 and 5, most of the electric field A is transmitted between electrodes 2 and 5 at the shortest distance. The electric field B is generated in the direction connected by the distance (in the insulating layer). However, a part of the electric field B leaks into the space and is generated from one electrode to the surface that does not face the other electrode. An electric field A is generated in the gas-filled space. The counter-electrode type uses electric field B, but the surface discharge type uses electric field B. Unlike the counter-electrode type, the electric field is not condensed, so the spot spreads out a little, but there is no big difference.In other words, even the counter-electrode type If the electrode 5 is opaque, the spot will be
It looks like it is split into two parts.

If the electrode 5 is a Nesa electrode, the part hidden by the electrode 5 will also be visible, resulting in a round light spot, but in the case of a surface discharge type, this light spot is only slightly larger.

To explain the operation, the selection of electrode 5 depends on electrodes 3 and 4.

Electrode 4 is for group selection, and 3 is for selection of electrodes within the group. As shown in FIG. 1, when electrode 4 on the right end and electrode 3 on the top end are selected,
The float electrode 5 having the hatched portions 5a and 5b at both ends is selected (applied with a potential), and in this example, the intersection between it and the selected one of the directly driven electrodes 2 emits light. The Y electrode 2 may also be a float electrode similar to the electrode 5, and may be driven in a matrix. However, when matrix drive is used, there is a state of half selection (the potential is intermediate potential), and when both the X and Y electrodes are float electrodes and matrix drive is used, various combinations of non-selection, half selection, and selection occur, and half selection. In some cases, there is a problem that there is no significant difference from the selection and luminescence can be seen, so care must be taken in selecting the potential.

The advantage of the float electrode method is that n×m float electrodes 5 can be driven by n (four in this example) drive electrodes 3 and m (also four) drive electrodes 4. In this case, since it is sufficient to provide a driver for each drive electrode, (n+m)
Only one piece is enough. In this example, one end 5b side of the electrode 5 is divided into four groups, and there are four group selection drive electrodes 4, so there are four drivers to drive these, and four drivers are installed on the other end 5a side. Since there are intra-group position selection driving electrodes 3, it is only necessary to have four drivers to drive these, a total of eight drivers, and with this, 16 float electrodes 5 can be selectively driven.

Note that the relationship between the drive electrode 3.4 and the float electrode 5 does not have to be the vertical relationship as in the embodiment, and can be modified as appropriate. When the lower display electrode 2 is made floating, the drive electrode may be buried in the substrate 1 and placed along the electrode 2 as shown in 20 in FIG. 2. This method increases the coupling capacitance C'. be able to.

Effects of the Invention As described above, according to the present invention, it is possible to significantly reduce the number of lead-out terminals of a flat panel type gas discharge panel, which is advantageous for colorization, reduce the number of drive circuits, and reduce the number of elements used. It has the advantage of being able to

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line xx', and FIG. 3 is an explanatory diagram of a surface discharge. In the figure, 1.12 is a glass substrate, 2 is one display electrode, 3
is an intra-group position selection drive electrode, 4 is a group selection drive electrode, 5 is the other display electrode (float electrode), 6 to 8 are insulating layers, 10
is the discharge gas, and C, l, and C2 are the coupling capacitances. Applicant Fujitsu Ltd. Representative Patent Attorney Minoru Aoyagi Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In a surface discharge type gas discharge panel in which a discharge gas is sealed between opposing substrates, and one display electrode group and the other display electrode group are disposed crosswise on one substrate side with an insulating layer interposed therebetween, at least A surface discharge type gas discharge panel characterized in that one display electrode group is floated and capacitively coupled to a group selection drive electrode and an intragroup position selection drive electrode for matrix drive.