JPH04170579A - Driving method for discharge type display device - 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 [Field of Industrial Application] The present invention relates to a driving method that enables high-speed driving and low-voltage driving of a discharge type display device such as a plasma display using discharge.

[Conventional technology]

Currently, there are many attempts to create multicolor or full color displays using rare gas discharges, and it has become technically possible.

Figures 3 and 4 are, for example, materials from the Illuminating Society of Japan (Light-related Materials and Devices Research Group, MD-90-16°P, 83).
~P, 88.1990) and JP-A-62-21183
FIG. 1 is an exploded perspective view and a sectional view showing a cell structure of a panel similar to that of the conventional discharge type display device disclosed in Publication No. 1. In both figures, a conventional discharge type display device includes a back substrate (1) made of a translucent material such as soda glass, and a back substrate (1) made of soda glass or the like placed opposite to the back substrate (1) at a predetermined distance. a front substrate (2) made of a translucent material; and vertical ribs (3b) interposed between the front substrate (2) and the rear substrate (1) so as to define a discharge space as described later.
and a sealing wall (hereinafter referred to as sealing rib) (3) made of an insulating material as a separating member having horizontal ribs (3C).

On the inner surface of the back substrate (1) facing the front substrate (2), a plurality of cathodes (4) are formed parallel to each other and spaced at equal intervals, and are arranged regularly so as to be orthogonal to these cathodes (4). The cathode (4) is formed by vertical ribs (3b) formed at regular intervals and horizontal ribs (3C) formed at regular intervals so as to be perpendicular to the vertical ribs (3b). A display discharge cell (5) including an intersection with a display anode provided on the front substrate (2) side, which will be described later, is defined, and the vertical ribs (3b) form a display discharge cell (5) that includes an intersection between all the cathodes (4) and a display anode provided on the front substrate (2) side, which will be described later. An auxiliary discharge cell (6) serving as a pilot transfer cell including an intersection with an auxiliary anode provided on the (2) side is defined. Then, the auxiliary discharge cell (6) of the vertical rib (3b)
) A priming path (3d) is formed on the outer wall of the auxiliary discharge cell (6) by providing a gap in order to draw the space charge generated by the discharge in the auxiliary discharge cell (6) into the display discharge cell (5). Display discharge cells (5) are arranged on both sides of the auxiliary discharge cell (6) with 3d) in between.

Further, on the inner surface facing the rear substrate (1) of the front substrate (2), which corresponds to the display surface of the discharge vessel formed by overlapping with the rear substrate (1), a display anode (7) and writing are provided. The auxiliary anode (8) necessary for The body (9) is coated. Note that a discharge gas such as He-Xe or Ne-Xe is contained inside the display discharge cell (5) and the auxiliary discharge cell (6) of the discharge vessel, which is constructed by overlapping the rear substrate (1) and the front substrate (2). For example, 1 (1-600 Torr@sealed).

Next, the operation will be explained with reference to the pulse voltage waveform applied to each electrode shown in FIG. In the figure, DA is the pulse applied to the display anode (7), Kn+Kn+I is n
, shows pulses sequentially applied to the cathode (4) in the n+1th row. First, by applying a pulse voltage to the cathode (4) and the auxiliary anode (8), auxiliary discharge moves in parallel along the auxiliary anode (8) in the lines of each cathode (4), and the auxiliary anode (8) ) After forming a pilot flame by supplying space charges to the display discharge cells (5) on both sides via the priming path (3d), the generated charges are transferred to the display discharge cells (5) to perform display writing. As shown in the timing chart of FIG. 5, scanning pulses and writing are applied to the cathode (4) and display anode (7) in the display discharge cell (5) in the same row adjacent to the auxiliary discharge cell (5). A pulse is applied to draw charge into the display discharge cell (5) and discharge starts. After completing the write operation, the display anode (7) and cathode (4) in the selected display discharge cell (5) are repeatedly injected with a sustain pulse and a display pulse (DC-applied negative By applying a voltage pulse), the discharge continues for one frame period, and the generated ultraviolet light excites the phosphor (9) to emit light, and a so-called memory display that continues to operate until an erase pulse is applied is performed. be exposed. In this way, a specific display discharge cell (5) is selected and displayed. In addition, the display anode (
7) will not be displayed if there is no write pulse applied.

[Problem to be solved by the invention]

Since the conventional discharge type display device is configured as described above, when generating a discharge in the display discharge cell (5), a pilot light is applied to each shade & (4) line in the auxiliary discharge cell (6) in turn. The discharge moves in parallel along the auxiliary anode (8), and the auxiliary anode (8)
) Briming path (3d
), it is necessary to form a pilot flame to supply a space charge, and since the write operation is performed only with the potential generated by the space charge, the reliability of the write operation is limited by the time constraints until the next operation and the cell size and shape. This method has problems such as being susceptible to malfunctions due to the large influence of variations and reproducibility of pulse waveforms.

This invention was made to solve the above problems, and provides a method for driving a discharge type display device that improves writing malfunctions and enables low-voltage driving to perform continuous writing operations. The purpose is to provide

[Means to solve the problem]

A method for driving a discharge type display device according to the present invention includes a front substrate and a rear substrate made of a transparent material, and a plurality of discharge cells provided in between the substrates to block outside air and define a plurality of discharge cells in a matrix shape inside. In a discharge type display device, the discharge type display device includes a sealing wall configured to seal a discharge gas inside each discharge cell, and displays by individually selecting the discharge cells and emitting light from the discharge cell. On the inner surface of one of the front substrates, a cathode and a display anode coated with a dielectric layer are alternately arranged in parallel and spaced apart by a predetermined distance, and on the inner surface of the other substrate, the display anodes are arranged orthogonally to the electrodes on the substrate side. Auxiliary anodes necessary for data writing are arranged in parallel at predetermined intervals, and the cathode, display anode, and auxiliary anode are arranged in each discharge cell to form a display discharge cell, and the cathode and display anode are arranged in parallel. A gap is formed in the wall part of the sealing wall along the scanning writing direction parallel to the auxiliary anode, so that adjacent display discharge cells in the scanning writing direction parallel to the auxiliary anode communicate with each other. Charges formed in the display discharge cells were transferred to the next row by applying a pulse voltage sufficient for sustained discharge to the positive potential auxiliary anode and the negative potential cathode of the display discharge cell in the next row. rear,
Data is written using the space charge formed in the display discharge cell by the scanning pulse of the auxiliary anode and the negative pulse applied to the cathode, and the internal potential caused by the wall charge formed on the surface of the dielectric layer of the display anode. It is something.

[Effect]

In the method for driving a discharge type display device according to the present invention,
After transferring charges from the previous row between the auxiliary anode and the cathode, by coating the display anode surface with a dielectric layer, when a writing operation is performed using the scanning pulse voltage of the auxiliary anode and the pulse voltage to the cathode, the writing operation A space potential based on the formed space charge and a potential due to the wall charge formed on the anode surface are formed at the same time, and depend on variations in the shape and dimensions of the display discharge cell and the reproducibility of the pulse waveform that is successively applied. It is possible to perform stable write operations without

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. Third
In FIGS. 1(a) and 1(b), in which the same parts as those in FIG. A plurality of display anodes (7) as first electrodes are patterned at equal intervals, and a dielectric layer (10) is provided to cover the display anodes (7). ,
Between the display anodes (7), a cathode (4) as an 's2 electrode and a pilot cathode (4^) are patterned in parallel and at equal intervals to form a pair with the display anode (7). 7
) and cathode (4) are set at intervals of 50 to 800 μm, for example), and a front substrate (2), which will be described later, surrounds these electrodes.
) is formed as a sealing lip (3) as a separation body interposed between the two and defining a discharge section.

The sealing rib (3) includes a sealing layer (3a) forming a mouth-shaped outer frame, and a plurality of vertical ribs (3b) and horizontal ribs (3b) orthogonal to each other inside the sealing layer (3a). 3c) formed in a matrix, and the pilot flame cathode (4^)
and an auxiliary discharge cell (5A) for creating a pilot flame (initial charge) and a display discharge, in which the cathode (4) and display anode (7) are respectively arranged to face an auxiliary anode on the front substrate (2) side, which will be described later. The auxiliary discharge cell (5^) and the display discharge cell (5) are arranged so as to define a cell (5), and the auxiliary discharge cell (5^) and the display discharge cell (5) extend over the adjacent display discharge cell (5) and the horizontal rib (3c) along the writing scanning direction. They are communicated via a briming path (3d) that has a charge transfer function.

On the other hand, the pilot flame cathode (4A) is provided on the inner surface of the front substrate (2) which is stacked facing the rear substrate (1).
and a main body arranged in parallel and at regular intervals in a direction perpendicular to the cathode (4) and the display anode (7), and from this main body perpendicular to the auxiliary discharge cell (5A) and each display discharge cell (5). In order to stabilize the discharge by increasing the area facing the pilot cathode (4A) and cathode (4) on the rear substrate (1), the branch section (pilot cathode (
The wide branch part (8^) facing 4A) is used as the pilot anode), and the comb-shaped third electrode has a structure so that all the auxiliary anodes of each discharge cell are kept at the same potential. The auxiliary anode (8) of the display discharge cell (8) is patterned, and the display discharge cell (8) is patterned.
A phosphor (9) as a light-emitting material is coated on the display inner surface of cell 5), and a black coat (12) made of a thick black glass frit film is applied on the display side of the auxiliary discharge cell (5a). It is designed to block the radiation from the discharge.

Here, the dielectric layer (lO) usually has a withstand voltage of 200V.
About 1 kV to 1 kV is required, and a low melting point glass layer is usually formed into a paste by screen printing, and the film thickness needs to be about 20 to 80 μm. Therefore, in order to sufficiently accumulate charges on the surface of the dielectric layer (10) (to form a high internal potential), it is better to use a material with a high dielectric constant, and the dielectric constant is usually about 5 to 60. (The reason for this is that a large capacitance like a normal AC type has the drawback of poor pulse response.) However, it is also possible to form the dielectric layer (10) by other methods, and in the case of a vapor deposition method, a coating method, etc., it is necessary to select a different value for the film thickness.

In the above configuration, when a positive voltage pulse is applied to the anode (8), positive charges are accumulated on the surface of the dielectric layer (10), and then, for example, when a negative potential is applied to the cathode (4), ,
The electric potential of the charge on the surface of the dielectric layer (10) has a function of assisting the initiation of discharge. Therefore, in non-selected cells, by applying a drive pulse to erase the charges accumulated on the surface of the dielectric layer (10), the sustain discharge margin can be greatly improved.

Further, according to the structure of the above embodiment, the auxiliary discharge cell (5A
), a voltage is applied between the pilot flame anode (8A) and the pilot flame cathode (4A) to cause a discharge, and the generated pilot flame charge is written to the display discharge cell (5) and is sent to the briming bus along the scanning direction. (3d). In addition, the cathode (
4) Since the display anode (7) and the auxiliary anode (8) exist in the same display discharge cell (5) for display, the structure can be simplified without the need for the conventional example 9 auxiliary discharge cell, and the display discharge It is possible to increase the cell aperture ratio.

The structure of the display discharge cell (5) and the auxiliary discharge cell (5A), which are connected to each other, creates and transfers the charge at the time of starting the discharge, and allows the sustained discharge (sustaining discharge) after the start of the discharge to reduce the charge remaining in the space. The memory can be driven by periodically applied voltage pulses to operate as a matrix display element.

Next, the operation and effect of the apparatus of this embodiment will be explained using FIG. In Figure 2, there is a pilot anode (8A) which is a data line provided in an auxiliary discharge cell (5A) for initial charge formation in the discharge vessel, and a pilot cathode (8A) arranged perpendicularly opposite thereto. 4A), and in order to transfer this charge in the row direction (scanning write direction), a pulse is applied to the auxiliary anode (8) and a cathode (8A) at the timing before writing in the previous row. 4) to form a charge in the display discharge cell (5), and data writing is performed using a scanning pulse of the auxiliary anode (8) and a negative pulse of the display anode (7). At this time, an extremely reliable potential based on the writing operation is achieved due to the potential due to the space charge formed within the display discharge cell (5) and the internal potential due to the wall charge formed on the surface of the dielectric layer (10) of the display anode (7). Since the formation can be performed, it becomes possible to continue the subsequent memory display operation without malfunction.

That is, data is written using the space charge formed in the display discharge cell by the scanning pulse of the auxiliary anode and the negative pulse applied to the cathode, and the internal potential caused by the wall charge formed on the surface of the 8-electrode layer of the display anode. By doing so, it is possible to form an extremely reliable potential based on the write operation, so that the subsequent memory display operation can be continued without malfunction.

In the above embodiment, a color discharge display device using a phosphor has been described, but a discharge display device that uses discharge color directly without using a phosphor may be used, and the same effects as in the above embodiment can be obtained. In addition, in the above initial charge formation,
The front glass substrate (1) side of the auxiliary discharge cell (5A) for initial charge formation is coated with a black coat (12) made of black glass frit to block visible light emitted by discharge within the auxiliary discharge cell. Needless to say, the brightness and contrast of the display screen can be improved. Furthermore, although the effect on memory display was not explained in the above embodiment, the writing operation of the above structure forms a larger internal potential than before, and the capacity control can reduce reactive current, so memory display is performed continuously. The voltage and current of the driver can be lowered, making it possible to use a low-cost driver.

〔Effect of the invention〕

As described above, according to the present invention, charge is transferred from the previous cell to the cell to be displayed by applying a pulse voltage sufficient for sustained discharge to the auxiliary anode and cathode, and the scanning pulse of the auxiliary anode is Since data writing is performed using the space charge formed in the display discharge cell by the negative pulse to the cathode and the internal potential due to the wall charge formed on the surface of the 8 electric layer of the display anode, the write operation is performed. This has the effect that the internal potential within the display discharge cell can be increased, and the next memory display can be realized without malfunctioning.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are a sectional view showing a discharge display device according to an embodiment of the present invention, a sectional view taken along the line a-a in FIG. 1(a), and FIG. Voltage timing charts, FIG. 3, FIG. 4, and FIG. 5 are an exploded perspective view, a sectional view, and a drive waveform diagram showing a conventional discharge type display device. (1)...Back board (2)...Front board (3)...Sealing rib (3d)...Briming bath (4)...Cathode (4A)...For pilot flame Cathode (5)...Display discharge cell (5A)...Auxiliary discharge cell (7)...Display anode (8)...Auxiliary anode (8A)...Anode for pilot flame (wide branch part) )(9)...
Phosphor (10)...Dielectric layer (12)...Black coat In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A front substrate and a rear substrate made of a translucent material are provided between the two substrates to block outside air, and are formed to define a plurality of discharge cells in a matrix shape inside, and to supply discharge gas to the inside of each discharge cell. In a discharge type display device that is provided with a sealed sealing wall and that displays by individually selecting the discharge cells and emitting light by discharge, a cathode and a cathode are provided on the inner surface of either the rear substrate or the front substrate. Display anodes covered with dielectric layers are alternately arranged in parallel at predetermined intervals, and auxiliary anodes necessary for writing data perpendicular to the substrate-side electrodes are arranged on the inner surface of another substrate at predetermined intervals. A display discharge cell is formed by arranging the cathode, a display anode, and an auxiliary anode in each discharge cell in parallel, and a sealing wall along the scanning writing direction parallel to the cathode and display anode. A gap is formed in the wall part to communicate the adjacent display discharge cells in the scanning write direction parallel to the auxiliary anode, and during the writing operation by line sequential scanning, the charges formed in the display discharge cells of the previous row are transferred to a positive potential. After performing charge transfer for the next row by applying a pulse voltage sufficient for sustained discharge to the auxiliary anode and the negative potential cathode of the display discharge cell in the next row, the scan pulse of the auxiliary anode and the negative potential cathode of the display discharge cell of the next row are applied. Driving a discharge type display device characterized in that data is written using an internal potential caused by a space charge formed in a display discharge cell by a negative pulse and a wall charge formed on the surface of a dielectric layer of a display anode. Method.