JPS583556B2 - Gas Hoden Panel Nokudo Houshiki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a driving method for an AC type gas discharge panel, and more particularly to a new driving method for improving the operating margin during writing in the gas discharge panel.

As is well known, an AC type gas discharge panel (hereinafter abbreviated as FDP) consists of two glass substrates each having a large number of electrodes coated with a dielectric layer and placed facing each other, with an N
A discharge gas such as E is sealed in the display, a voltage higher than the discharge starting voltage is applied between the electrodes to generate a discharge spot, and this discharge spot is used as one pixel to obtain a desired display pattern.

Such FDP display patterns are used as various displays, and for example, when used as a character display in a computer system, a so-called man-machine interface is realized.

For convenience of explanation, an FDP used as a character display will be described below as an example.

The character display consists of one character block with an nxm dot matrix, and the character block is displayed on the PDP.
The blocks are arranged in an NXM block matrix on the top.

Generally, when a character A, for example, has been written in an arbitrary character block, and an attempt is made to erase it and write a character B, the operation of simply A-erasing-B writing is performed.

However, according to such an operation, the difference in electrical and physical state between the dots that were ignited (the discharge spots forming A) and the dots that were not ignited is not completely removed, and the next Since the letter B is written, there will be a difference in ignition conditions between dots where A and B overlap and dots where A and B do not overlap.

This difference leads to a reduction in the operating margin, which is an obstacle to obtaining a higher quality character display.

Therefore, to solve this problem, use Full Mark (Full Mark).
Mark) By inserting an operation called write before writing the next new character, we were able to achieve a significant improvement in the operating margin.

However, in the full mark writing, conventionally, for each character block, among the m discharge electrodes in the X direction and n discharge electrodes in the Y direction, for example, m X discharge electrodes are simultaneously applied with a write voltage. A method of sequentially writing line by line by sequentially applying a write voltage to n Y discharge electrodes that intersect with this voltage (sliced scan)
ning).

Therefore, in one character block, the display of A becomes B.
There was a drawback that it took a long time to rewrite the display.

Furthermore, the RD method (R: resistance, D
: diode), this resistor R suppresses the write voltage, and therefore a sufficient write voltage is not applied, resulting in a drawback that full mark writing cannot be performed satisfactorily.

Therefore, the present invention eliminates the above-mentioned drawbacks, and provides an FDP that can write a full mark for each block in a short time, stably and completely write the full mark, and prevent induced disturbances to adjacent blocks. The purpose of this is to provide a drive system for the following.

In accordance with the above object, the present invention is characterized in that a part of the sustain voltage generating circuit is also used in a character display so that full mark writing is simultaneously performed for each character block to shorten the time.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a plan view showing the basic structure of an extremely common FDP, and FIG. 2 is a partially enlarged sectional view thereof.

In these figures, 1 is the X discharge electrode arranged on the first glass substrate 2, 3 is the Y discharge electrode arranged in ten on the second glass substrate 4, and 5 and 6 are the X and Y discharge electrodes respectively covered. 7 is a gas discharge space filled with Ne or the like, 8 is a group of X discharge electrode drive terminals, and 9 is a group of Y discharge electrode drive terminals.

A desired display pattern can be obtained by selecting an arbitrary cell from a large number of discharge cells in which the X and Y discharge electrodes intersect and forming a discharge spot.

This discharge spot is obtained by causing a discharge by applying a predetermined writing voltage between the X and Y discharge electrodes 8 and 9 intersecting the discharge point where the discharge is to be caused. With the help of wall charges appearing on layers 5 and 6, the discharge spot is formed and maintained at an AC voltage much lower than the write voltage, which is called a sustain voltage.

Note that erasing a discharge spot once formed is also carried out by applying an erasing pulse with a narrow time width to the X and Y discharge electrodes.

Figure 3 shows a schematic circuit configuration for realizing a PDP driving method based on the present invention and an FDP for character display.
FIG.

However, most of the circuit diagram in FIG. 3 is the same as the conventional one, except that a transistor Q6 that operates as a block-by-block write ground clamper is newly added, and the driving method has been changed.

In this figure, the area surrounded by a dashed line 11 is one character block, and five X discharge electrodes 1 and seven Y discharge electrodes 3 constitute a 5×7 dot matrix.

This character block 11 further constitutes the entire FDP by a block matrix of MXN.

Now, in the character block 11 of the 1st row and 1st column, for example, the alphabet A
is written as shown in the figure, and this is to be rewritten to the alphabetic character B.

In this case, as described above, the operation margin is increased through a mode of 81 full mark write-erasure 1B, but conventionally, full mark write was performed as follows.

First, all five transistors Q1 constituting the block common write driver are turned on, and the X side write voltage Vw is applied to all the X discharge electrodes 1.

At this time, the transistor Q4 constituting the Y-side block-by-block write driver is turned on and the Y-side write voltage -V
Apply w.

However, in this case, all seven transistors Q5 that make up the common line selection ground write clamper are on, and by sequentially turning off these transistors Q5 1, 2, . . . , the ground clamp is removed. When a write voltage is applied to each Y discharge electrode 3 of each character block and the seventh transistor Q5 is turned off, full mark writing has been completed.

Therefore, as a matter of course, it was necessary to sequentially turn off the seven transistors Q5 in order to write a full mark in one character block.

Further, the write voltages ■w and -Vw are applied to the X and Y discharge electrodes through the limiting resistors R' and R forming the RD matrix circuit from the transistor group Ql and the transistor Q4, respectively, so that the write voltage has a waveform. As a result of the rounding, there is a substantial overall reduction, with some dots not being completely written as full marks.

In order to eliminate such drawbacks, the present invention has the following configuration.

First, in order to shorten the time for writing a full mark, turn on the transistor Q2 that constitutes the sustain pull-up driver for each block, and write the first one through the diode D1'.
A sustain pull-up voltage of 10 Vs is applied to all the X discharge electrodes 1 of the character block 11 in the first row and first column.

At this time, at exactly the same timing as the application of the sustain pull-up voltage, the write voltage -
Vw is the Y discharge electrode 3 that constitutes the first line character block.
Give 6 pieces.

In this case, the first, second,..., seventh transistors Q5 constituting the common line selection ground write clamper are all turned off from the beginning, and the character block rows that do not require voltage application from the second row onwards are connected to the block write clamp transistor Q6.
Turn on and ground.

Therefore, the write voltage -Vw is supplied to the seven Y discharge electrodes 3 in the first row at once, and there is no need to turn off the transistor Q5 sequentially as in the conventional case, so full mark writing is completed in a short time. do.

As mentioned above, in the present invention, the sustain driver Q2
Since the write driver Q1 functions as the write driver Q1, the sustain pull-up voltage is directly applied to the X discharge electrode 1 without passing through the resistor R'.

In this case, it goes without saying that the voltage difference between the sustain voltage s and the write voltage 1Vw from the Y side is set to exceed the discharge start voltage.

In addition, since the write voltage -Vw on the Y side is applied at the same timing as its sustain pull-up voltage (8), the roundness of the rise of the write voltage is sufficiently smaller than in the past, making full mark writing stable and reliable. It will be done.

The write voltage Vw applied to the Y discharge electrode constituting the character block in the first row is the transistor Q5 constituting the newly installed block-by-block grounded write clamper in the present invention.
By turning on, the voltage is returned to the ground potential again, forming the falling part of the write voltage pulse.

This transistor Q6 has no resistor connected to it, and the time constant at the falling edge of the write voltage pulse is also sufficiently small.

On the other hand, the falling part of the write voltage pulse on the X discharge electrode side is obtained by turning on the transistor Q5 forming the sustain pulldown driver for each block.

Note that the full mark once written is maintained for a predetermined period of time by the normal operation of the aforementioned X-side transistors Q2 and Q3, which constitute the sustain pull-up and pull-down drivers for each block, and the Y-side sustain driver (not shown) for each block. or it is immediately erased without being maintained, and then the next new character information is written by the selection operation of the write driver Q1 and clamp transistor Q3 on the X side and the write driver Q4 and clamp transistor Q5 on the Y side. written.

The above-mentioned erasing operation can be performed in a well-known manner by applying a narrow erasing pulse to each block using a driver for generating a sustain voltage.

Full marks can be written in a short time and completely by using a newly installed block-by-block ground write clamper, transistor Q6, and a block-by-block sustain pull-down driver (transistor Q3), which is attached to a non-address character block. ), the non-address character block is grounded through a low impedance circuit, which also has the effect of reducing the influence of induced noise generated through the inter-electrode capacitance from the address character block.

As explained above, according to the present invention, when rewriting the display of a certain character in an arbitrary character block to another character in FDP, another new character is displayed accurately in a short time and along a predetermined pattern, and High quality display is achieved.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a general FDP, Fig. 2 is a partially enlarged sectional view of Fig. 1, and Fig. 3 shows a drive circuit for implementing the present invention and a part of the FDP for character display. It is a diagram. In the figure, 1 is an X discharge electrode, 3 is a Y discharge electrode, Q1 is a group of transistors that constitute a block common write driver, Q2 and Q3 are transistors that constitute a sustain pull-up and pull-down driver for each block, and Q
Reference numeral 4 designates a transistor that constitutes a block-by-block write driver, Q5 a transistor group that constitutes a common line selection ground write clamper, and Q6 a transistor that constitutes a block-by-block write clamper.

Claims (1)

[Claims] 1 comprises M X discharge electrodes and N Y discharge electrodes, the X discharge electrodes and the Y discharge electrodes are arranged in m and n blocks, respectively, and each m X discharge electrode At the same time, a sustain pull-up driver for each block provides a rising portion of the discharge sustaining voltage Vs, and a sustain pull-down driver for each block provides a falling portion of the sustaining discharge voltage.
On the other hand, a write driver for each block simultaneously applies a rising portion of the write voltage -Vw to every n Y discharge electrodes, a ground clamper for each block that applies a falling portion of the write voltage -Vw, and a ground clamper for each block that simultaneously applies a rising portion of the write voltage -Vw to every n A block common line selection ground write clamper is connected to each of the Y discharge electrodes and can selectively apply a ground potential to the Y discharge electrodes, and the block common line selection ground write clamper is connected to each of the Y discharge electrodes to selectively apply a ground potential thereto. All of the discharge points consisting of mXn blocks selected by turning on the block-by-block sustain pull-up driver connected to the m X discharge electrodes corresponding to the block and the block-by-block write driver connected to the n Y discharge electrodes at the same timing. At the same time, a rising part of the write voltage is applied to the block, and a sustain pulldown driver for each block corresponding to the selected block and a ground clamper for each block connected to the n Y discharge electrodes are both turned on to control the falling part of the write voltage. A driving method for a gas discharge panel, characterized in that the discharge points of the selected blocks are once ignited simultaneously by obtaining a total of 1.