JPH0475617B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an AC type gas discharge display device, and particularly to a display device equipped with a drive system in which the drive circuit is miniaturized.

[Conventional technology]

In AC-type gas discharge display devices (also called plasma display devices), a multiplex drive method was developed in which display electrodes are coupled using capacitors.A pair of capacitors is arranged for one display electrode, and the electrodes on both sides are connected. Wiring in a matrix configuration is used to provide such devices such that the electrodes are at address potential only when both electrodes are addressed, and at half-select potential when only one electrode is selected. It is configured. Gas discharge display device is
It has a high discharge starting voltage (threshold voltage), and is designed so that it does not discharge at a half-selection potential, but only at a selection potential.

[Problem that the invention seeks to solve]

For the drive circuits of conventional AC gas discharge panels, methods have been proposed to reduce the number of drive circuits by multiplexing drive, such as the discharge shift method, but since the drive voltage is high, a drive circuit with a large withstand voltage is required. Further, there is a drawback that the operation speed becomes slower when multiplexing is performed. Furthermore, with regard to the above-mentioned half-select potential, conventionally writing and erasing was performed at arbitrary locations, but there is a problem in that during actual driving, discharge occurs at the half-select potential, making it impossible to obtain a sufficient operating margin. Conventionally, the method was to apply an erase pulse to the areas where you want to write, but not to apply the erase pulse to areas where you want to leave it as is, but experience has shown that the half-select potential has a large effect on writing and not writing. It was done.

[Means for solving problems]

The above-mentioned problem is caused by an AC type gas discharge in which a substrate with coupling capacitors connected to both sides of the display electrode and terminals on the opposite side of the coupling capacitors are wired in a matrix is placed perpendicular to a substrate with a normal electrode structure. In the panel, after all one line wired in a matrix is turned on, an erase pulse is applied to the same line by an erase operation canceling pulse applying circuit formed using a low voltage integrated circuit, and at the same timing as the erase pulse, a 1 of the sustaining voltage is applied to the opposite electrode. The problem is solved by providing a gas discharge display device characterized in that it is configured to apply a voltage pulse of /2 or less to cancel the erasing operation and produce a display.

[Effect]

An object of the present invention is to provide a small, low-cost gas discharge display device by reducing the number of circuits through multiplexing and driving by a low-voltage IC without reducing the writing speed. In order to avoid this, only one electrode is driven multiplexed by capacitive coupling to reduce the number of drive circuits, and the other electrode can be driven using a low breakdown voltage IC instead of reducing the number of drive circuits. This is to reduce the scale and eliminate the influence of half-selective potential.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of one example of a gas discharge display device according to the present invention, and 1 and 2 in the figure are glass substrates. Display electrodes 3 are formed on the glass substrate 1 in the Y-axis direction (horizontal direction in the figure), and extensions 3a and 3b of the display electrodes extending to the panel periphery serve as crossover side drive electrodes 4 and short side drive electrodes. 5 and insulating layer 6
They are facing each other through. A protective film 7 is formed on the display portion of the insulating layer 6. On the other hand, glass substrate 2
An X-direction electrode 11 is formed thereon, and an insulating layer 12 and a protective layer 13 are sequentially formed thereon. These two glass substrates 1 and 2 are placed facing each other and sealed with a seal 15 with a gap 14 provided therebetween. The gap 14 is filled with a mixed gas mainly consisting of neon. A capacitance is formed between the display electrode extensions 3a, 3b and each drive electrode 4,5.

Each drive electrode is wired as shown in FIG. 2, for example, and in the illustrated example, 4
A case of x3 matrix driving is shown.

An example of the first driving method according to the embodiment of the present invention is as follows:
A circuit is configured as shown in FIG. 3, and a voltage pulse shown in FIG. 4 is applied. In FIG. 3, 31 is a gas discharge panel (each discharge spot is arranged in a dot matrix in parallel to the X and Y axes);
32 is a Y' driver, 33 is a Y'' driver, 34 is a logic LSI, 35 is an X driver, 35 is a shift register, 37 is a sustain driver that supplies high voltages of 90V and 140V to the , 38 is a main controller, and a portion 39 surrounded by a broken line is a floating circuit, and the main controller is a data memory circuit (not shown) containing data for displaying desired characters, numbers, etc. on the gas discharge panel 31. It is connected to the.

The Y′ driver is connected to the crossover side drive electrode 4,
The Y″ driver is connected to the short side drive electrode 5.The write pulse and erase pulse are applied only to the display electrodes on both the crossover side and the short side, and the same voltage as the input voltage is applied to only one side. A voltage half the input voltage is applied to the display electrodes. Matrix drive is performed with Y' and Y'', and write pulses are sequentially applied to each line of the Y display electrodes.
Vw and erase pulse Vc are applied. The X-side driver 35 and shift register 36 are circuits floating on a floating ground voltage _VFG . At the timing of the erase pulse Vc, an erase canceling voltage _VE is applied to the X line to be lit and displayed in response to the data signal.

As shown in FIG. 5, the erase cancellation voltage V _E at this time may be less than 1/2 of the sustain voltage (approximately 90 V) or less, up to about 35 V, so that a driver LSI can be easily realized. FIG. 5 is a diagram showing the operating margin of the embodiment of the present invention, where the horizontal axis represents the erase cancellation voltage V and the vertical axis represents the operational margin.

According to this embodiment, the number of circuits for the Y driver, which requires a high withstand voltage driver, can be significantly reduced by multiplexing drive using capacitive coupling, while the X driver can use an IC with a low withstand voltage, so it is small and low cost. A display device can be realized. As for the display speed, since it can be driven by line scanning, it can perform the same high-speed display as conventional devices.

6 and 7 are diagrams similar to FIGS. 3 and 4 of other embodiments of the present invention, in which positive and negative sustaining voltages ±Vs and write voltages are supplied from Y' driver 41 and Y'' driver 42. A pulse Vw and an erase voltage pulse Vc are applied, and a line selection write/erase voltage pulse Vc is applied to the display electrode.At this time, the X electrode is always maintained at OV, and erase cancellation corresponding to the data signal is performed at the timing of the erase pulse. A pulse V _E is applied.The operating characteristics such as the operation margin display speed are exactly the same as in the previous embodiment, but in this example, there is no need to float the low voltage X driver 44 and shift register 45, so the floating It is possible to reduce the number of circuits required for this purpose, resulting in further downsizing and cost reduction.

〔Effect of the invention〕

As explained above, according to the present invention, after all one line wired in a matrix is lit, an erase pulse is applied to the same line, and at the same timing as the erase pulse, a voltage pulse of 1/2 or less of the sustain voltage is applied to the opposite electrode. By applying the voltage to cancel the erasing operation and display, the gas discharge display device can be made smaller and lower in cost without reducing the display speed.

[Brief explanation of the drawing]

1 and 2 are diagrams for explaining the gas discharge display device of the present invention, FIGS. 3 and 4 are diagrams for explaining the operation of the device of the present invention, and FIG. 5 is a diagram for explaining the operation margin of the present invention. The diagrams shown in FIGS. 6 and 7 are diagrams for explaining the operation of another embodiment of the present invention. In the figure, 1 and 2 are glass substrates, 3 and 11 are display electrodes, 3a and 3b are extensions of the display electrodes that form capacitance to be coupled with each drive electrode, and 3
1 is a gas discharge panel with capacitive coupling multiplexed on only one board, 32, 33, 41, 42 are Y drivers,
35 and 44 are X drivers.

Claims (1)

[Claims] 1. A substrate in which coupling capacitances are connected to both sides of the display electrodes 3 and 11, and opposite terminals of the coupling capacitances are wired in a matrix, and a substrate with a normal electrode structure are arranged orthogonally. In AC type gas discharge panel,
After all one line of matrix wiring is turned on, an erase pulse is applied to the same line by an erase operation canceling pulse application circuit formed using a low voltage integrated circuit, and at the same timing as the erase pulse, an erase pulse is applied to the opposite electrode at 1/2 or less of the sustaining voltage. 1. A gas discharge display device characterized in that a voltage pulse of 1 is applied to cancel an erasing operation to produce a display. 2. The gas discharge display device according to claim 1, wherein the circuit for applying the erasing operation canceling voltage pulse is floated, and the circuit is formed of a low breakdown voltage integrated circuit. 3 Connect the positive and
2. A gas discharge display device according to claim 1, wherein a negative sustain voltage pulse and an erase/write voltage pulse are applied, and the erase operation canceling pulse application circuit is formed of a low breakdown voltage integrated circuit.