JPS5849872B2 - Crawler type self-propelled agricultural machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a method for driving a gas discharge panel for displaying characters, particularly for solving problems when writing new information to an external electrode type gas discharge display panel for character display or rewriting a display shield. This relates to a new drive method that has been improved to prevent ignition errors.

Background of the Technology, Prior Art and Problems In an external electrode type gas discharge panel having row and column electrodes each covered with a dielectric layer, an alternating current sustaining voltage is normally applied between all the electrodes. Then, a predetermined write operation is performed by applying a write voltage of a value exceeding the ignition voltage to the electrode selected according to the input information.

However, in this type of gas discharge panel, it has been confirmed that the surface condition of each discharge point determined at the opposing intersection of each row and column electrode or the amount of charged particles existing in the discharge space greatly affects the actual writing operation. There is.

For example, if you want to erase the displayed information and write new information, or if you want to rewrite the information displayed as a set of ignition discharge points at a specific position to other information, display the new information. Depending on whether the previous state of the target discharge point was an ignition state or a non-ignition state, a difference occurs in the writing conditions of the discharge point, resulting in malfunctions such as ignition errors or redundant ignition errors.

In addition, with the intention of reducing the occurrence of writing errors due to non-discharge of discharge points in conventional plasma display panels, an operation of artificially discharging all discharge points on the panel in a short period of time to erase them, so-called A method of adding a refresh operation (Japanese Unexamined Patent Publication No. 49-84331) has also been proposed by the present applicant.

However, this method is a refresh technology that targets the entire surface of the panel, and when operating a prisma display panel for character display, it is necessary to refresh the entire surface without destroying display information that has already been written. This is not always easy, and in some cases, problems may occur, such as display fluctuations caused by refresh operations becoming noticeable and contrast decreasing in already displayed areas.

In addition, since the full refresh operation using this method naturally destroys the information existing on the display screen, it must be inserted when the panel starts operating, when the screen is cleared, or at the first write signal. There is a considerable time difference between the writing immediately after the operation and the writing before the next refresh operation, resulting in a difference in the writing state, and there is a problem in that it is difficult to obtain uniform writing conditions over the entire surface.

OBJECTS OF THE INVENTION In view of the above-mentioned problems with the conventional type, an object of the present invention is to define display blocks corresponding to characters when operating a gas discharge panel for displaying characters, and to perform partial refresh associated with writing operations in character block units. When rewriting display characters or writing new characters, the display information that has already been written will not be destroyed.
The purpose is also to ensure that the same write conditions can be obtained at any position.

Structure of the Invention In the present invention, a plurality of X electrodes and Y electrodes coated with a dielectric layer are used, and the plurality of X electrodes and Y electrodes are arranged in groups of multiple electrodes to constitute columns and rows of characters to be displayed. For example, a character block is formed by each of the plurality of X electrodes and Y electrodes, and the X electrode and the Y electrode
The discharge points for one block set at the electrode intersections of the electrodes are
In a method for driving a character display gas discharge panel that displays characters one character at a time by selectively discharging the character unit blocks corresponding to a display area for characters, new character information is added to a selected character unit block. Each time a character unit block is to be displayed, a writing operation is applied to the discharge point corresponding to at least new character information in the character unit block to cause discharge in each block, and then the discharge of the character unit block is temporarily stopped. There is provided a method for driving a character display gas discharge panel, characterized in that the information is erased, and then a discharge point corresponding to the new character information is selected and writing is performed character by character.

In the method of the present invention, when writing or rewriting new information for each predetermined character display block, specifically (1) all discharge points of one block are ignited once and then erased. , then write new information, or (2) write new information over the discharge point that is igniting and discharging to display the previous information, then erase the block once and write new information again. Two methods are proposed: how to write the information.

Embodiment of the Invention FIG. 1 is a diagram for explaining the outline of character display operation on a gas discharge panel.The gas discharge panel (FDP) 1 has a plurality of X electrodes X1 and X2 each covered with a dielectric layer as is well known. ,...-......, Xn and Y electrode Y,
, Y2 , ......, Yn.

The Y electrodes are arranged in sets of seven to form the rows of characters to be displayed, and the X electrodes are arranged in sets of five to form the columns of characters to be displayed, thus each A plurality of character display areas each having 5×7=35 discharge points as one block are provided between the Y electrode and the Y electrode.

And each X and Y electrode has an X address driver 1 driven by the decoding output of the input information.
3 and a Y address driver 14 are connected, and a sustain voltage power supply 15 is connected to provide a constant sustain voltage between each electrode, and these operations are controlled by the output of the control system 2.

Now, the present invention relates to a method of rewriting information already displayed or writing new information in the above-mentioned character display system. First, the former method will be explained. For example, when configuring one character display area, Character “A11” displayed by selective ignition of 35 discharge points
When rewriting the character "Be" to another character "Be", the steps shown in FIG. 2 are taken.

That is, the display of "A" indicated by the black circle indicating the ignition discharge point in FIG. 2a is replaced with another new information 14B.
When rewriting it to +1, first ignite all the discharge points in one character display area as shown on the top of Figure 2B, and then change the white circle in Figure 2C to indicate the non-ignition state. After erasing all the discharge points ignited in the previous step b, as shown in FIG. 2, another new information ``B'' is written, and the rewriting is completed as shown in FIG. 2d.

In addition, in the first step mentioned above, instead of igniting all the discharge points once, as shown in the lower part of Figure 2b, the previous display is erased and the information of "B" to be displayed next is superimposed. It is also possible to write by

In any case, by adopting such a method, the preparation state of the discharge surface and discharge space of the discharge point corresponding to the information to be rewritten becomes uniform, and writing without ignition errors can be efficiently performed.

FIG. 3 is a diagram for explaining a driving method when writing new information to a discharge point that has been cleared to an erased state, by also selecting a discharge point in a single character display area.

In this case, from the state shown in Figure 3a, all the discharge points are ignited once as shown in the upper part of Figure 3b, or the next information to be written is preliminarily written once as shown in the lower part. I'll leave it there.

Then, as shown in FIG. 3C, this area is completely erased, and then new information e+B 11 to be displayed is written again as shown in FIG. 3D.

In this way, even if there is a discharge point that could not be ignited at the first stage in Figure b, the discharge surface and discharge space of the discharge point corresponding to the new information will be almost uniform, and the next write ignition will be performed. At this time, the preparation state is good and reliable writing can be performed with fewer ignition errors.

The operations shown in FIGS. 2 and 3 described above can be easily achieved by designing the logic of the control circuit in the device shown in FIG. 1 in advance to be able to respond to such operations. .

A detailed configuration diagram of the circuit shown in FIG. 1 is shown in FIG. 4.

In FIG. 4, the gas discharge panel 1 has a vertical X electrode 11.
and a horizontal Y electrode 12.

Five Y electrodes and seven Y electrodes constitute a character display block consisting of 5×7 dots of discharge points.

An X side driver 13 and a Y side driver 14 are connected to the X and Y electrodes.
A sustain voltage pulse generator 15 and a write/erase pulse generator 16 are connected to these drivers.

The X-side driver 13 receives the output of the X-side address counter 17 based on address data (ADS) K and character data (C
DS) is applied through the mixing gate circuit 18 to supply character pattern information to a set of five X electrodes at the character block location to be addressed.

The output of the Y-side address counter 19 corresponding to address data (ADS) and the output of the Y-line counter 20 corresponding to the output of the character generator 22 are applied to the Y-side driver 14 through a mixing gate circuit 21.

A control circuit 24, a clock pulse generator 22, and a timing gate circuit 23 are provided.

The operation of the circuit shown in FIG. 4 will be explained with reference to the waveform diagram shown in FIG.

The character writing operation is performed with T as one cycle.

This character writing cycle is a total lighting period TFw, an erasing period T
E, consists of a memo and a character writing period TCW.

In response to input of new character information (IS) to the control circuit 24, the timing gate circuit 23 outputs the full lighting control signal FW.
When S is output, all the 5-bit slice outputs of the character generator 22 are set to logic "1", and the Y electrodes y1 to y7 of the addressed block are set as shown in YAS in FIG. 5 by the output of the Y line counter 20. Each time a block is sequentially selected, full mark pattern signals such as XD1 to XD5 are applied to the five X electrodes, and a write operation is applied to all discharge points of the block.

Next, the timing gate circuit 23 may be the BES of FIG.
When a signal indicating the block erase period as shown in is output,
The write/erase pulse generator 16 is driven in the erase mode, and a narrow erase pulse is applied to the addressed block from the X electrode side, thereby erasing the once written full mark pattern.

When the signal (CWS) indicating the character writing period is output again, the character generator 22 is connected to the X electrode of the addressed block.
The character pattern information read out from the Y line counter 20 on the Y electrode side is sequentially written in accordance with selection by the Y line counter 20.

Effects of the Invention As described above, according to the present invention, when a gas discharge panel is operated for displaying characters, display blocks are determined corresponding to characters, and partial refresh can be performed in conjunction with a writing operation for each character block. When rewriting display characters or writing new characters, the display information that has already been written is not destroyed, and the same writing conditions can always be obtained at any position.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of a character display device using a gas discharge panel to which the present invention is applied, and FIG. 2 is a block diagram showing the outline structure of a character display device using a gas discharge panel to which the present invention is applied. FIG. 3 is a diagram showing step-by-step an embodiment in which new information is written in a character display area in an erased state according to the present invention; FIG. 4 is a detailed circuit diagram of the control system in the apparatus shown in FIG. 1, and FIG. 5 is a diagram showing the operating characteristics of the circuit shown in FIG. Explanation of symbols: 1...Gas discharge panel, 2. ．． ．．
．． ．． ．． Control system, 11...X electrode, 12...
...Y electrode, 13...X address driver, 1
4...Y address driver, 15...
Sustaining voltage pulse generation circuit, 16...Writing and erasing pulse generation circuit, 17...X address counter,
18...X side mixing gate, 19...
...Y address counter, 2o...Y line counter, 21...Y side mixing gate, 22
. . . Character generation circuit, 23 . . . Timing gate circuit, 24 . . . Control circuit.

Claims (1)

[Claims] 1. Using a plurality of X electrodes and Y electrodes covered with a dielectric layer, the plurality of X electrodes and Y electrodes are arranged in groups of multiple electrodes to constitute columns and rows of characters to be displayed. The plurality of X electrodes and Y electrodes form one character unit block, and the discharge point for one block defined at the electrode intersection of the X electrode and the Y electrode corresponds to the display area for one character, In a method for driving a gas discharge panel for character display that displays character by character by selectively discharging the character unit block, each time new character information is written in the selected character unit block, the character information is After performing a write operation on the discharge point corresponding to at least new character information in the character unit block to be displayed and causing discharge in each block, the discharge of the character unit block is once erased, and then the new A method for driving a gas discharge panel for character display, characterized in that writing is performed character by character by selecting a discharge point corresponding to character information.