JPS5923345Y2 - plasma display panel - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a plasma display panel, in particular an external electrode type panel in which a discharge voltage is applied between opposing electrodes that sandwich a gas medium capable of discharging, thereby causing a gas discharge between the opposing electrodes. Regarding plasma display panels.

In a plasma display panel, electrodes are formed on a pair of insulating plates made of transparent glass plates, etc., the surfaces of these electrodes are covered with a transparent dielectric film, and both edge plates are placed with a gas space in between. Both electrodes are placed facing each other, and the outer periphery is hermetically sealed with frit glass, etc.
Furthermore, the gas space is evacuated and an inert gas such as neon is filled in. By applying a voltage higher than the discharge starting voltage between the selected electrodes via the respective external connection terminals, the gas can be removed. This causes discharge to occur and provides a predetermined issue display.

Conventionally, plasma display panels with the above structure
If you want to display only some display parts with higher brightness than other display parts, for example, if you want to display the FDP characters in Figure 1 brighter than other parts of the Japanese character, the digits of the Japanese character part If the time to scan electrodes 1 and 2 is △t, digit electrode 3
To do this, turn on the high voltage driver 11 for 2△ and connect it to GND.
Ground to potential.

Correspondingly, the high-voltage driver 12 of the FDP segment electrode 4 was turned on to guide an AC high-voltage pulse, thereby obtaining twice the brightness.

In addition, 5 in the figure indicates a segment electrode, and 14 indicates a high voltage driver for the segment electrode.

Conversely, when reducing the brightness of FDP characters to 1/2, 2△t
This was achieved by setting 1/2Δt instead of .

However, in the above conventional method, for example, 2△t or 1/2△t is set only for the digit electrode 3 as shown in Fig. 1, so despite the complexity of the logic circuit and the display that is always lit, This method has the drawback of being uneconomical because it requires a high-voltage driver 11 of 1.

An object of the present invention is to provide a plasma display panel which eliminates the above-mentioned drawbacks and is inexpensive as an apparatus.

According to the present invention, the first insulating plate includes the first electrode group covered with the first dielectric, and the second insulating plate includes the second electrode group covered with the second dielectric. are combined so that the first electrode group and the second electrode group face each other via a spacer, and are filled with an ionizable gas medium, and a selected counter electrode of the first and second electrode groups is combined. In the plasma display panel having an external connection terminal for applying a high voltage pulse of alternating current to discharge between the first and
A third electrode having a lead wire capacitively coupled to at least one electrode of the electrode group but having no external connection terminal is placed on the first insulating plate and covered with the first dielectric material. a fourth electrode covered with the second dielectric is provided on the second insulating plate at a position facing the third electrode; There is obtained a plasma display panel characterized in that an external connection terminal for applying a high voltage pulse of alternating current that discharges between the two electrodes is connected to the fourth electrode and provided on the second connection substrate. .

The principle of the present invention will be explained in detail using other circuit diagrams such as that shown in FIG.

In FIG. 2, as mentioned above, when it is desired to turn on the display cell 21, a voltage V higher than the discharge starting voltage is applied to the segment electrode 22.
A pulse of O is applied to drive the digit electrode 23 to ground.

This grounding means is not shown because it may be the same as the high voltage driver 13 shown in FIG.

At this time, in order to light up the display cell 31 without grounding the digit electrode 33, that is, in order to discharge the display cell without providing an external connection terminal for grounding, the digit electrode 23 and the digit electrode 33
They may be coupled by a capacitance Cst so that a voltage higher than the discharge starting voltage is induced between the digit electrodes 33 and the segment electrodes 32.

With the above configuration, as long as the digit electrode 23 is selected (grounded) and a voltage is applied to the segment electrode 32, the display cell 31 can be lit at all times.

At this time, the display cell 31 has a higher C5t than the display cell 21.
Since there is a voltage drop caused by this, the brightness is lowered by this drop, and brightness modulation is performed.

FIG. 3 shows an embodiment in which the present invention is applied to stock price display.

FIG. 3 schematically shows a plan view of a plasma display panel 40 which is used to draw attention to the stock price of a certain stock by lighting up the underline brighter than the stock price display area so that the stock price can be recognized at a glance.

In the figure, electrodes formed on the upper substrate are drawn with solid lines, and electrodes formed on the lower substrate are drawn with dotted lines.

The digit electrode 44 is a digit electrode for underlining, and the digit electrode 41
, 42 and 43, it is formed on the upper substrate and covered with a dielectric material.

In order to strengthen the capacitive coupling between the digit electrode 44 and the digit electrodes 41 to 43, the digit electrode 44 has lead wire portions 441, 442, 443.
As shown in the figure, the digit electrodes 41 to 43 were wired in parallel.

The underlined segment electrodes 55 are formed on the lower substrate like the Japanese character segment electrodes 61 to 63, covered with a dielectric, and connected to the external connection terminals 54.

Japanese character segment electrodes 61 to 63 formed on the lower substrate
The internal wiring and wiring of external connection terminals are the same as before as shown in Figure 1, and the display means are no different from the conventionally known method as shown in Figure 1. A wiring diagram of the electrodes 61 to 63 is also omitted.

When lighting the underline, it is sufficient to connect the external connection terminal 54 of the underline segment 55 to the AC high voltage pulse generator 57 via the switch 56, and the digit electrode 4
There is no need to synchronize with the selection of external connection leads 411, 421, and 431 of 1 to 43.

If an AC high voltage pulse is constantly input to the underline segment 55 by the switch 56, when the digit electrode 41 is selected by the high voltage driver 13, the lead wire of the digit electrode 44 is connected even though the digit electrode 44 has no external connection terminal. 4
41 and the digit electrode 41, the underline is lit.

Similarly, since the digit electrodes 42 and 43 are lit while each of the digit electrodes 42 and 43 are selected, the underline is lit while the digit electrodes 41 to 43 are selected.

In the case of this example, the brightness of the underline was not three times that of the numeral part but about twice that of the numeral part because of the voltage drop due to the capacitance between the parallel lines, but the purpose of increasing the brightness was sufficiently achieved.

Furthermore, a driver for the underline digit electrode 44 is not required, making it more economical.

As is clear from the above explanation, the brightness can be easily varied by capacitively coupling with how many digit electrodes.For example, to make the brightness darker than the number part, one digit electrode 41
It is sufficient to form a capacitance only between the two.

An example of this case is a case where the variable brightness display section is applied to an indicator such as a pilot lamp.

When switching on the device, even if no data is sent and the digit part is in the blank state, the digit electrode is selected, so if you input an AC high voltage pulse to the pilot lamp segment electrode, the pilot lamp will be activated. Only the light is on,
It can be shown that the device is running.

Similar applications can be considered not only for pilot lamps but also for trademarks or product names.

As described above, according to the present invention, the number of capacitors can be increased or decreased in the manufacturing process of plasma display panels without requiring a driver for digit electrodes that performs signal control and brightness modulation in a logic circuit as in the past. The structure is inexpensive and highly reliable.

As an additional effect, by constantly lighting the brightness modulation part, the inside of the plasma display panel is always filled with ionized charged particles, so when a display signal is input, it immediately lights up, i.e., turns on. There is also an improvement effect.

[Brief explanation of the drawing]

Figure 1 is a schematic circuit diagram for explaining the conventional brightness modulation method.
FIG. 2 is a circuit diagram for explaining the principle of the present invention, and FIG. 3 is a schematic circuit diagram showing an embodiment in which the present invention is applied to stock price display. 1.2,3,23,33,41.42.43...
・Girder electrode, 4, 5, 22, 32゜61.62.63...
... Segment electrode, 21.31 ... Display cell, 55 ... Underline segment.

Claims (1)

[Scope of utility model registration request] A first insulating plate consisting of a first electrode group covered with a first dielectric and a second insulating plate consisting of a second electrode group covered with a second dielectric are connected to the first electrode group. and a second electrode group are combined so as to face each other via a spacer, and an alternating current high voltage is filled with an ionizable gas medium and discharges between selected opposing electrodes of the first and second electrode groups. In a plasma display panel having an external connection terminal for applying a pulse, a third electrode having a lead wire capacitively coupled to at least one electrode of the first electrode group but having no external connection terminal; An electrode is provided on the first insulating plate so as to be covered with the first dielectric, and a fourth electrode is provided on the second insulating plate and covered with the second dielectric.
an external connection terminal for applying an alternating current high-voltage pulse to discharge between the third electrode and the fourth electrode, and an external connection terminal for applying an alternating current high-voltage pulse to discharge between the third electrode and the fourth electrode. A plasma display panel, characterized in that the plasma display panel is connected to the second connection substrate and provided on the second connection substrate.