JP2000098971A - Plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to display an NTSC interlace signal as it is, to reduce a cost because an interlace sequential scanning conversion circuit is not necessary, and moreover, to prevent the picture quality from deteriorating due to mis-conversion. SOLUTION: An interlace signal is displayed without conversion with the light emitted only on both sides of the odd numbered lines in the odd numbered fields, and only on both sides of the even numbered lines in the even numbered fields. Namely, in the odd numbered fields, light emitting operation is performed by the address according to a display address and the sustain discharge between the odd numbered scanning electrode and the sustain electrodes, between the odd numbered scan electrode S1 and the address electrode, and in the even numbered fields, the light emitting operation is performed by the address according to the display signal and the sustain discharge between the even numbered scanning electrode and the sustain electrode, between the even numbered electrode S2 and the address electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a plasma display device which emits address and sustain light for efficiently displaying an interlaced video signal.

[0002]

2. Description of the Related Art Plasma display panels (PDPs)
Is attracting attention as a large display because of its thinness, visibility, and good response. The schematic configuration is shown in FIG. 2 and will be described with reference to the drawing.

In FIG. 2, reference numeral 101 denotes a plasma display panel. In this example, scan electrodes S1 to S4 are used.
And up to. In parallel with this, the sustain electrode SUS
Are arranged, and the address electrodes A1 to
Am are arranged orthogonally. 102 is a control circuit, 103
Is a scan electrode drive circuit, 104 is a sustain electrode drive circuit, and 105 is an address electrode drive circuit. The gradation is 1
This is performed by dividing the field into a number of subfields (often about 8 to 12), weighting the light emission intervals of each subfield, and selecting and emitting light.

As a panel for displaying a high-definition HDTV signal, a system has been disclosed in which the light emitting portion is different between an odd field and an even field as shown in FIG. 6 (JP-A-9-16).
0525). This method uses the sustain electrode SUS1
And SUS2 are made different for each field, and one of the scan electrodes is alternately addressed and emitted. Since the structure of the panel 101 is not the gist of the present invention, its description is omitted.

[0005]

However, when a general NTSC television signal is projected on the panel having the structure shown in FIG. 6, interlaced-to-sequential scan conversion is performed, and as shown in FIG. Also, the same part was addressed to emit light. For this conversion, to improve the vertical resolution, it is necessary to use an adaptive circuit that uses a signal in a field or an adjacent field signal by judging whether the image is a moving image or a still image for each pixel of the screen.

This circuit has the drawbacks that the circuit scale is large and the cost is high, and the discrimination between a moving image and a still image is 100%.
It is also difficult to eliminate errors, and image errors will occur if mistakes are made. Since a normal television signal has about 480 effective scanning lines, the image address is also 4 bits.
There is a disadvantage in that the light emission time is shortened by that much and the luminance is also reduced. Since the waveform of the sustain electrode is the same in FIG.
It is displayed as US.

[0007]

According to the present invention, an odd scan electrode 2i-1 (i = 1 to n) and an even scan electrode 2i are provided.
(I = 1 to n) and a sustain electrode provided in parallel between the odd-numbered and even-numbered scan electrodes is arranged on the substrate, and the odd-numbered and even-numbered scan electrodes are arranged on another substrate which is spaced apart from and opposed to the substrate. A plurality of address electrodes orthogonally arranged are arranged, and in an odd field, an address corresponding to a display signal between the odd scan electrode and the address electrode and a light emitting operation by a sustain discharge between the odd scan electrode and the sustain electrode are performed. In the even field, a television signal is displayed by performing an address operation according to a display signal between the even scan electrode and the address electrode and performing a light emitting operation by a sustain discharge between the even scan electrode and the sustain electrode.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the operation of a plasma display device according to one embodiment of the present invention. As shown in FIG. 1, in the odd field, both sides are addressed and light is emitted around the odd-numbered scan electrodes S1, S3,.
In the even field, both sides are addressed and light is emitted around the even-numbered scan electrodes S2, S4,. In FIG. 1, since the sustain electrode waveform may be the same, it is representatively shown as SUS.

Next, the operation waveforms are shown in FIG. FIG. 3A shows an operation waveform of an odd field. First, during the set period, a preliminary discharge is performed between the sustain electrode and the scan electrode to reset the previous state. Next, during the address period (only four lines in this example), a voltage sufficient to form wall charges according to an image is applied between the address electrodes and the odd-numbered scan electrodes in synchronization. At this time, if the even scan electrodes are set to a voltage near the address electrodes, no wall charges are formed.

[0010] In the next sustain period, only the pixels in which the wall charges are formed discharge and emit light with the pulse voltage of the scan electrode and the sustain electrode. At this time, the even scan electrodes do not emit light with the same waveform as the sustain electrodes. As a result, an image of an odd field is displayed.

In the even field, on the contrary, the even-numbered scan electrodes are selected in the address period, and discharge and light emission are performed in the sustain period. At this time, the odd-numbered scan electrodes are held at a voltage that does not address and does not discharge. As a result, an image of the even field is displayed, and if this is repeated alternately, the interlaced signal can be displayed as it is.

Furthermore, in the present invention, if a panel dedicated to NTSC is used, the number of lines to be scanned in a certain field is half of the number of sequential scans, so that the number of output channels of the drive circuit may be half of the conventional one. The waveform shown in FIG. 3 can be realized by adding a switch for switching the output of the scan electrode driving circuit 103 which sequentially scans and generates a waveform and the output of the sustain in an odd field or an even field.

FIG. 5 shows a specific connection example. FIG. 5A shows the connection state of the odd field, in which the output of the scan electrode driving circuit is connected to the odd-numbered scan electrodes, and the even-numbered scan electrodes are connected to add a sustain waveform. In the even field, as shown in FIG. 5B, the output of the scan electrode driving circuit is connected to the even-numbered scan electrodes, and the odd-numbered scan electrodes are connected to add the sustain waveform.

[0014]

As described above, according to the present invention, NTSC
Since the interlace signal can be displayed as it is, no interlace-to-sequential scan conversion circuit is required, the cost can be reduced, and the image quality does not deteriorate due to conversion error.

Furthermore, since the number of scanning lines in one field is half that of the sequential scanning, the address period can be shortened, and the light emitting time is increased by the shortened address period.

[0016] It should be noted that, instead of continuously emitting light at the same place,
Alternately illuminating different places also has the effect of making the human eye feel brighter. If the panel is a dedicated NTSC panel, the number of output channels of the scan drive circuit can be reduced by half, so that there is an effect of reducing costs.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing the operation of a plasma display device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a plasma display device.

FIGS. 3A and 3B are operation waveform diagrams of the plasma display device in the present embodiment.

FIG. 4 is a conceptual diagram showing the operation of a conventional plasma display device.

5A and 5B are configuration diagrams of a plasma display device according to the present embodiment.

FIG. 6 is a conceptual diagram showing the operation of a conventional high-definition screen.

[Explanation of symbols]

 S1 to S4 scan electrode

Claims (2)

[Claims] An odd scan electrode 2i-1 (i = 1) is provided on a substrate.
To n), the even-numbered scan electrodes 2i (i = 1 to n), and the sustain electrodes provided in parallel between the odd-numbered and even-numbered scan electrodes. In the plasma display panel in which a plurality of address electrodes arranged orthogonally to the odd and even scan electrodes are arranged, in an odd field, an address corresponding to a display signal between the odd scan electrodes and the address electrodes, the odd scan electrodes and the sustain. A light emitting operation by sustain discharge between the electrodes is performed, and in an even field, a light emitting operation by sustain discharge between the even scan electrode and the sustain electrode is performed between the even scan electrode and the address electrode according to a display signal. Plasma display device. 2. The device according to claim 1, wherein the number of drivers for driving the scan electrodes is n in total, and means for selecting an odd-numbered scan line in an odd field and an even-numbered scan line in an even field is provided. Plasma display device.