Method of driving plasma display panel, and plasma display device

1. A method of driving a plasma display panel including a plurality of discharge cells including a display electrode pair having a scan electrode and a sustain electrode, wherein one field is formed of a plurality of sub-fields each of which includes an initializing period during which initializing discharge takes place in the discharge cells, and an addressing period during which address discharge takes place in the discharge cells, and a sustained period where sustain discharge takes place in the discharge cells, the method comprising the steps of:

setting each one of the sub-fields as one of an entire initialization sub-field and a selective initialization sub-field,

wherein in the entire initialization sub-field, the initializing discharge takes place during the initializing period at all discharge cells that are involved in displaying a video, and in the selective initialization sub-field, the initializing discharge takes place during the initializing period at a selective discharge cell,

wherein the sustain discharge has taken place in a sub-field immediately before the initializing period:

controlling an initializing voltage which generates initializing discharge in the entire initialization sub-field when the entire initialization sub-field is switched over to the selective initialization sub-field or vice versa; and

setting an initializing voltage of at least one of the entire initialization sub-fields in a field immediately before a field, in which a number of entire initialization sub-fields is increased, higher than an initializing voltage of at least two of the entire initialization sub-fields in a field immediately after a field in which the number of the entire initialization sub-fields has been increased.

2. The method of claim 1 further comprising the step of:

setting an initializing voltage of at least two of the entire initialization sub-fields in a field immediately before a field, in which a number of entire initialization sub-fields is decreased, lower than an initializing voltage of at least one of the entire initialization sub-fields in a field immediately after a field in which the number of the entire initialization sub-fields has been decreased.

3. The method of claim 1 further comprising the steps of:

raising an initializing voltage of the entire initialization sub-field in one field step by step over a period of a consecutive plurality of fields; and

switching the selective initialization sub-field to the entire initialization sub-field.

4. The method of claim 1 further comprising the steps of:

switching one of the entire initialization sub-fields in one field to one of the selective initialization sub-fields; and

lowering an initializing voltage of at least one of the remaining entire initialization sub-fields step by step over a period of a consecutive plurality of fields.

5. The method of claim 1 further comprising the steps of:

raising an initializing voltage of the entire initialization sub-field step by step for a period of 0.2 second - 1.6 seconds; and

switching the selective initialization sub-field to the entire initialization sub-field.

6. A plasma display device comprising:

a plasma display panel including a plurality of discharge cells having a display electrode pair formed of a scan electrode and a sustain electrode; and

a scan-electrode driving circuit for applying a voltage in an inclined waveform gently rising or falling to the scan electrode;

wherein one field is formed of a plurality of sub-fields each of which includes an initializing period where initializing discharge takes place in the discharge cells, and an addressing period where address discharge takes place in the discharge cells, and a sustained period where sustain discharge takes place in the discharge cells,

wherein each one of the sub-fields is one of an entire initialization sub-field and a selective initialization sub-field, wherein in the entire initialization sub-field, the initializing discharge takes place during the initializing period at all discharge cells that are involved in displaying a video, and in the selective initialization sub-field, the initializing discharge takes place during the initializing period at a selective discharge cell, wherein the sustain discharge has taken place in a sub-field immediately before the initializing period

wherein the scan-electrode driving circuit switches the entire initialization sub-field to the selective initialization sub-field or vice versa, and controls an initializing voltage that is a maximum value of a voltage in an inclined waveform which is used for generating an initializing voltage in the entire initialization sub-field; and

wherein the scan-electrode driving circuit raises the initializing voltage of the entire initialization sub-field in one field step by step for 0.2 second - 1.6 seconds, then switches the selective initialization sub-field to the entire initialization sub-field.

7. The plasma display device of claim 6 , wherein the scan-electrode driving circuit switches one of the entire initialization sub-fields in one field to the selective initialization sub-field, then lowers an initializing voltage of at least one of the remaining entire initialization sub-fields step by step for 0.2 second - 1.6 seconds.

8. The plasma display device of claim 6 , wherein the scan-electrode driving circuit lowers an initializing voltage of the entire initialization sub-field in a field immediately after a field, in which the selective initialization sub-field is switched to the entire initialization sub-field, to a voltage lower than an initializing voltage of the other entire initialization sub-fields.

9. The plasma display device of claim 6 , wherein the scan-electrode driving circuit lowers an initializing voltage of one of the entire initialization sub-fields in a field immediately before a field, in which the entire initialization sub-field is switched to the selective initialization sub-field, to a voltage lower than an initializing voltage of the remaining entire initialization sub-fields.