JPS5882297A - Driving system for plasma display panel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention seals up gas that can be discharged and applies an alternating current voltage to opposing electrodes covered with a dielectric material. Regarding the driving method of a plasma display panel that has a display function, in particular, a driving method of a plasma display panel that has an improved display method that performs intermittent discharge light emission in the opposing space and alternates between lighting and non-lighting. to.

FIG. 1 shows an example of a second drive circuit in which discharge light is emitted in the space facing the plasma display panel intermittently and the display is repeatedly turned on and off.

Figure 1 shows a circuit that uni-drives eight self-operating members Ft&H*a-g in each digit of a plasma display panel 1°.When driving with this, the output of DC-AC inverter 6 is segment-driven. The voltage waveform as shown in FIG. 3 2H switched by section 2 is applied to the message segment electrode H of the plasma display panel, and further applied to the column electrode CIKB via the discharge space.
The generated voltage is switched to the voltage waveform shown in FIG. 3 by the digit drive section 3. FIG. 3 2H-CI shows the voltage waveform applied between the camellia C1 and the message segment electrode H for the hour digit 11. Between the electrodes, there is a unidirectional discharge starting voltage Vu: 2Vf of the plasma display panel, and a larger %1 voltage (Vl+V,
) is applied and discharge occurs.

On the other hand, the segment drive unit 2 is OFF and the girder sliding unit 3 is OFF.
F, segment drive unit 2 is ON, digit drive unit 3 is O
N or segment l moving section 2 is ON, digit drive section 3 is OFF
In the case of F, a voltage smaller than the unidirectional discharge starting voltage V u = 2 V f of the plasma fist panel is applied between the two electrodes, so the discharge stops.

By selecting and switching the segment drive unit 2 and the digit drive unit 3 in this way, it is possible to control not only the message segment but also the discharge of each segment, making it possible to display numbers, characters, etc. .

FIG. 1 shows a circuit for intermittently displaying a message segment H on a plasma display panel 1. After setting an intermittent display command signal 8 to a high level VH as shown in FIG.
The same intermittent signal generation circuit 10 as shown in the figure, but the intermittent signal 9 generated a little.
shows a state in which the intermittent control circuit 7 applies the intermittent control signal 7a to the H segment drive section. As can be seen from FIG. 3, in this plastic display panel 1, C1 is selected, segment H for one message is not selected by the segment signal control unit 4, and segment H for message is an intermittent control signal. As a result, the output of the segment drive section 2 is as shown in FIG. 3, 2H.

Therefore, since the voltage waveform H-C in FIG. 3 is applied between the H2C1 electrodes of the plasma display panel, the intermittent display is repeated in synchronization with the intermittent control signal 7a, and the display is turned on during the display period A. It turns off during period B.

In the intermittent display of the message segment as described above, if the intermittent display cycle is longer than 1 second, the display position of the message segment during the non-lighting period, and if the message segment displays numbers, literature, etc., the message circular stand will change. In addition, when the display brightness is high, the contrast ratio between the brightness of the lighting period and the non-lighting period is large, and the eyes are tired when reading the display.

The object of the present invention is to eliminate the above-mentioned drawbacks and provide a reliable plasma
The purpose of the present invention is to provide a display panel driving method.

According to the present invention, gas is filled in the opposing space in which the first electrode plate and the second electrode plate are opposed to each other, and the first electrode plate and the second -
The opposing space of each selected one of the electrode plates emits a single beam of light, creating a plasma that has the function of displaying numbers, letters, etc.
In the display panel, there are two brightness level states for the discharge light emission in the selected opposing space, and the display function of numbers, characters, etc. is illuminated at one of these brightness levels,
Furthermore, in a plasma display panel drive system characterized by transmitting an additional message by intermittently switching between two brightness levels, as an example, a message segment is provided with a display function at a higher brightness level of the two brightness levels. However, when displaying intermittently with synchronization of 1 second or more, the high brightness period is lit by setting the same as the period 7a and A in Figure 3 (b), but the low brightness period B is set as Vu2Vf. ) Intermittent control of large waveforms V and +V! In order to control and apply several forces to the Hakugo, it is possible to discharge and emit light at a lower brightness during the low brightness period (corresponding to the non-lighting period in Figure 1) than during the high brightness period. Even during low brightness periods during intermittent display, the display position of the message segment and the message content can be determined, and even when the display brightness is high, the brightness contrast ratio between the two brightness levels is better than when the display is on or off. The small scale display allows your eyes to no longer get tired at 9 o'clock.

Next, a second embodiment of the present invention will be explained with reference to FIGS. 2 and 4.

FIG. 2 shows the intermittent control circuit 7 of FIG. 1 and its node 1 signal. In this case, the Plasma Fist Tisflay panel is too small as shown in Figure 1! is selected, the message segment H is not selected by the segment signal control section 4, and the message segment H is switched by the intermittent control signal 7b. As a result, the trap for intermittently displaying the message segment) H is created by setting the intermittent display command signal 8 to . By combining the low-brightness period control signal 11 generated by the low-brightness period control signal generation circuit 12 at ', an intermittent control signal as shown in FIG. It is possible to switch the message segment H. As a result, H of plasma display panel 1
,C.

A voltage waveform shown in FIG. 4 H-01 is applied between the electrodes. In other words, during the low brightness period B corresponding to the non-lighting period in FIG.
Two voltage waveforms larger than u2Vf are applied, and during this period, discharge light is emitted at a lower brightness than the display period. Further, in order to control the brightness during this period, the width of the low level period of the intermittent control signal 7b, that is, the low brightness period control signal 11 is controlled, and by widening it, it can be made brighter, and by narrowing it, it can be made darker.

In the above description, the digit electrode C1' shown in FIG. 3 of Display Systems Co., Ltd., which performs discharge light emission intermittently in synchronization of 1 second or more and conveys a message, is always in a selected state, that is, as a static display, but the segment electrode Alternatively, in a so-called dynamic display in which digit electrodes are sequentially selectively scanned, the sequentially selective scanning electrode 2, for example, the digit electrode C1 shown in FIG. 3, becomes selected or unselected in response to scanning.
It may be considered that the ratio of the two *m levels of the message segment display is relatively equal to the static display. Therefore, it goes without saying that the display method of the present invention can also be applied to dynamic display. Furthermore, in this embodiment, the display function was provided at the high brightness level of the two brightness levels, but it is also possible to provide the display function at the low brightness level.

[Brief explanation of the drawing]

1 and 3(a) to 3(e) respectively show a circuit diagram and a voltage waveform diagram when message segments of a conventional Bramemer F display panel are intermittently displayed. 2 and 4(a) to 4(c) respectively show a circuit diagram and a voltage waveform diagram when message segments of a plasma display panel according to the present invention are intermittently displayed. 1...Plasma display panel, 2.
... Segment drive section, 3 ... Phase drive section, 4 ... Segment signal control section, 5 ...
・Digit signal control section, 6...DC-AC inverter (IN), 7, 7'... Intermittent control circuit, 8.
...Intermittent display command signal, 9...Intermittent signal, 10...Intermittent signal generation circuit, 11...
・Low brightness period 1SJjfir! + signal, 12...
-Low brightness period control signal generation circuit. Figure 1

Claims (1)

[Claims] 1%, gas is applied to the space facing the second electrode plate, and each of the selected 'ms plates of the first electrode plate and the second electrode plate is Opposing space is group 1! In a plasma display panel that has the ability to display numbers and characters by emitting tR light, there are two brightness level states for the discharge light emission in the selected opposing space, and numbers are displayed at either of these two brightness levels.・Plasma that integrates character display functions and conveys additional messages by intermittently switching between two brightness levels.
Display panel drive method.