JPH0418593A - Discharge panel display device - Google Patents

Abstract

PURPOSE:To decrease the number of electrodes and the number of driving circuits by arranging cathode scanning lines horizontally and anode scanning lines vertically and scanning the cathode scanning lines laterally corresponding to a sequential synchronizing signal. CONSTITUTION:Two right and left anode driving circuits 2 are provided corresponding to a discharge panel 1 and one cathode driving circuit 3 is provided laterally to the discharge panel 1. A scanning direction converting circuit 9 converts a digital video signal outputted by an A/D converter 6 from the horizontal direction to the vertical direction and a conversion processing circuit 5 performs series-parallel conversion and transfers the video signal, column by column, to the two anode driving circuits 2 at a time to drive a discharge panel 2 from the left side of the discharge panel 1. A control signal generating circuit 4, on the other hand, generates a pulse signal for scanning with the synchronizing signal and applies it to the cathode driving circuit 3, which applies the pulse signal to the cathode scanning lines. Consequently, the driving circuits and electrodes are decreased in number.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a discharge panel display device for displaying a television signal.

[Conventional technology]

FIG. 4 is a block diagram showing the basic configuration of a conventional discharge panel display device. In FIG. 4, 1 is a discharge panel in which anode and cathode electrodes are arranged in a matrix, 2 is an anode drive circuit, 3 is a cathode drive circuit.

FIG. 5 is a block diagram of a control device for the discharge panel display device shown in FIG. 4, and in FIG.

Also, analog video signals can be converted into analog/digital (
The video signal is input to a converter 6 (hereinafter referred to as A/D) and converted into a digital signal, and the video signal digitized by the A/D converter 6 is input to a conversion processing circuit 5. It looks like this.

This conversion processing circuit 5 converts digital video signals into serial-
Parallel conversion processing is performed and output to the anode drive circuit 2 is performed.

FIG. 6 is a block diagram showing a part of a discharge panel display device for explaining the principle of a discharge panel. In this sixth article, 1 is a discharge panel, 2 is an anode drive circuit, 3 is a cathode drive circuit, 7 is an anode scanning line, and 8 is a cathode scanning line.

Next, before explaining each specific operation of the discharge panel display device, the general operation of the discharge panel display device will be explained.

As an example, consider a 20-inch discharge panel display.

In such a discharge panel display device, a cathode and an anode are usually arranged perpendicular to each other, as shown in FIG. There are 640 anodes and 480 cathodes.

In the discharge panel, a part of the video signal for one line is applied to the anode scan m7, and the discharge cells for the cathodes emit light.

The scanning direction is 1.2. from top to bottom in the cathode scanning line 8.
The TV images are scanned in the order of 3...480 and displayed.

However, when a discharge panel is made to have a large screen, the electrodes become long, so the influence of stray capacitance becomes a problem in the anode, which operates at high speed.

Since stray capacitance is determined by the electrode length, the influence of stray capacitance can be reduced by separating the anodes into upper and lower sections, as shown in FIG.

In order to display a television image on the discharge bulb 1 as shown in FIG. 4, a control device as shown in FIG. 5 is used. In FIG. 5, the input video signal is digitally encoded by an A/D converter 6. In FIG.

Next, in the conversion processing surface fW5, this digital video signal is serial-parallel converted, and a portion of each row is transferred to the two upper and lower anode drive circuits 2, as shown in FIG.
The 0 anode scanning lines 7 are divided into upper and lower halves, and the anode scanning lines 7 are driven so as to be perpendicular to the 480 cathode scanning lines 8 by dividing them into 240 halves.

In addition, the control signal generation surface is 1it! At i4, a pulse signal for scanning is created from the synchronization signal and applied to the cathode drive circuit 3. As a result, the pulse signal from the cathode drive circuit 3 is shifted from the first line to the next line of the cathode scanning line 8, so that the discharge panel display device sequentially scans from the first line to the 480th line, and Display the signals.

From the above, when increasing the size of the conventional discharge panel 1, the number of anode scanning lines 7 is doubled in order to separate the anode scanning lines 7 into upper and lower halves, and the number of drive circuits is also doubled. become.

For this reason, when creating a horizontally elongated display with an aspect ratio of 4 = 3, such as in a television receiver, the number of electrodes and drive circuits will be significantly increased. 7 and 480 cathode scanning lines 8, for a total of 1760 lines.

Furthermore, in a horizontally elongated display with an aspect ratio of 5:3, such as a high-definition display, the number of electrodes and drive circuits will further increase.

(Problems to be Solved by the Invention) Conventional discharge panel display devices are configured as described above, so when they are made larger, the number of electrodes and drive circuits increases, leading to poor signal performance. There was a problem.

This invention was made to solve the above-mentioned problems, and aims to reduce the number of drive circuits and electrodes and obtain a discharge panel display device with good reliability.

[Means to solve the problem]

A discharge panel display device according to the present invention includes a discharge panel in which anode scanning lines are arranged in the vertical direction, cathode scanning lines are arranged perpendicular to the anode scanning lines and scan in the horizontal direction, and a digital video signal is arranged in the serial direction from the horizontal direction. The apparatus is provided with a first means for simultaneously driving the anode scanning lines after serial-to-parallel conversion, and a second means for sequentially scanning in the horizontal direction based on pulses generated from a synchronizing signal.

[For production]

After converting the scanning direction of the digital video signal from the horizontal direction to the vertical direction by the first means in this invention,
Serial-to-parallel conversion is performed to drive the anode scanning lines simultaneously, and the second
A pulse is generated from the synchronizing signal by the means, and based on this pulse, the cathode scanning line is sequentially scanned in the horizontal direction, and a display function is performed at a point perpendicular to the anode scanning line.

〔Example〕

Embodiments of the discharge panel display device of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment. In this FIG. 1, 1 is a discharge panel;
Reference numeral 2 indicates two anode drive circuits provided on both the left and right sides of the discharge panel 1, and 3 indicates a cathode drive circuit.

The anode drive circuit 2 and the cathode drive circuit 3 are arranged in opposite directions vertically and horizontally compared to the conventional example shown in FIG. That is,
Two anode drive circuits 2 are provided on the left and right sides of the discharge panel 1, and one cathode drive circuit 3 is provided horizontally with respect to the discharge panel 1.

Further, as is clear from FIG. 2, in the discharge panel 1, 640 cathode scanning lines 8 are arranged in the vertical direction, whereas 480 anode scanning lines 7 are arranged in the horizontal direction. .

These 480 anode scanning lines 7 are divided into two on the left and right, so that they are perpendicular to each of 320 of the 640 vertically extending cathode scanning lines 8.

The cathode drive circuit 3 that drives the cathode scanning line 8 is configured to receive an output pulse from the control signal generation circuit 4. The control signal generation circuit 4 receives a synchronization signal, generates a pulse signal for scanning from this synchronization signal, and applies this pulse signal to the cathode drive circuit 3.

The anode drive system is different from that shown in FIG. 5 in that a scanning direction conversion circuit 9 is inserted between the A/D converter 6 and the conversion processing circuit 5.

The scanning direction conversion circuit 9 converts the digital video signal output from the A/D converter 6 from the horizontal direction to the vertical direction, and outputs it to the conversion processing circuit 5 which performs serial-parallel conversion.

FIG. 3 (al indicates the pixel writing direction 10,
b) is a diagram showing the pixel readout direction 11;

Next, the operation will be explained. The discharge panel 1 shown in FIG. 2 is 20 inches long, and the electrodes are arranged orthogonally as in the conventional example.

In this embodiment, the difference from the conventional example is that the anode scanning line 7
This is because the positions of the cathode scanning lines 8 are swapped.

The cathode scan lines 8 are 1.2.3 from left to right.・・・・・・6
40, for a total of 640 pieces.

On the other hand, the anode scanning line 7 is arranged from top to bottom and has an angle of 1°2.3.
...480, for a total of 480 pieces.

The bright line is scanned from left to right according to the cathode scanning line 8.
3...640 are scanned in order.

Next, referring to FIG. 1, the entire apparatus will be explained.

The input video signal is digitally encoded by an A/D converter 6, and is input to a primary scanning direction conversion circuit 9, where the horizontal direction and vertical direction are exchanged.

This scanning direction conversion circuit 9 has a frame memory, and writes signals in the pixel writing direction 10 as shown in FIG. 3(a) as shown in FIG. First, the pixel is read out as shown in the pixel readout direction 11, and then the signal is output from top to bottom.

The conversion processing circuit 5 inputs the output of the scanning direction conversion circuit 9, performs serial-to-parallel conversion, and transfers a portion of the video signal to the two anode drive circuits 2 for each column.

The anode drive circuit 2 connects the discharge panel 2 from the left side of the discharge panel 1.
to drive.

On the other hand, the control signal generation circuit 4 generates a pulse signal for scanning from the synchronization signal and adds it to the cathode drive circuit 3, and the pulse signal is applied from the cathode drive circuit 3 to the cathode scanning line 8.

By sequentially shifting this signal from the first row to the next row, the discharge panel display device sequentially displays the television signal from the first column to the 640th column.

[Effects of the Invention] As described above, according to the present invention, the cathode scanning lines are arranged to scan in the horizontal direction, the anode scanning lines are arranged vertically, and the cathode scanning lines are sequentially arranged horizontally in response to a synchronization signal. For example, in the case of a 20-inch discharge panel, the number of electrodes is 640 for the cathode and 960 for the upper and lower anodes.
The total number of electrodes is 1600, and the number of electrodes is reduced by 160. Therefore, the number of drive circuits is also reduced, which has the effect of improving reliability. This effect becomes greater as the discharge panel becomes larger and the number of display pixels increases.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall structure of a discharge panel display device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the structure of a discharge panel in the same embodiment, and FIG.
) is an explanatory diagram of the pixel write direction in the above embodiment, Figure 3 (■) is an explanatory diagram of the pixel read direction in the above embodiment, Figure 4 is a block diagram of a conventional discharge panel, and Figure 5 is a conventional discharge panel display. FIG. 6 is a block diagram showing the overall configuration of the device. FIG. 6 is a block diagram for explaining the drawbacks of the conventional discharge panel. 1...Discharge panel, 2...Anode drive circuit, 3...
Cathode drive circuit, 4... Control signal generation circuit, 5... Conversion processing circuit, 6... A/D converter, 7... Anode scanning line, 8... Cathode scanning line, 9...・Direction conversion circuit In the figures, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 Scanning direction 2: ===≠> tb) Figure 4 Figure 5 Procedure amendment

Claims (1)

[Claims] It is composed of a large number of anode scanning lines arranged in the vertical direction and a large number of cathode scanning lines arranged to scan in the horizontal direction perpendicular to the anode scanning lines, and between the anode scanning line and the cathode scanning line. A discharge panel displays a display by discharging a digital video signal, a scanning direction conversion circuit inputs a digital video signal and switches the horizontal direction to the vertical direction, and the video signal converted vertically by the scanning direction conversion circuit is converted into a series-parallel system. a conversion processing circuit that performs the conversion; an anode drive circuit that drives the anode scanning line based on the output of the conversion processing circuit;
A discharge panel display device comprising: a control signal generation circuit that generates a pulse signal from a synchronization signal; and a cathode drive circuit that sequentially scans the cathode scanning lines one by one based on the pulse signal output from the control signal generation circuit.