Drive method for plasma display panel and plasma display device
View Patent ↗When an average peak level is high, and there is a difference in weight between a subfield SF 1 on the lowest level and a subfield SF 2 on the second lowest level while their sustain cycle numbers are equal, all scan electrodes are scanned for the subfield SF 1 on the lowest level. Simultaneously, data pulses according to video signals are impressed on data electrodes only when an odd number scan electrode is scanned in an odd number field (an nth frame), and the data pulses according to the video signals are impressed on the data electrodes only when an even scan number electrode is scanned in an even number field (an (n+1)th frame).
1. A method for driving a plasma display panel in which one field is constituted by a plurality of subfields, comprising the steps of:
impressing data pulses on data electrodes provided on individual display cells in one or more subfields of said plurality of subfields in association with a video signal to generate a write discharge for a gradation display on the plasma display panel; and
assigning a sustain cycle number to at least one subfield of said plurality of subfields in accordance with luminance of the video signal, said sustain cycle number being equal to that assigned to the other subfield, and said at least one subfield having a weight lower than that for the other subfield,
wherein said step of impressing the data pulses includes impressing the data pulses only on the data electrodes of predetermined display cells which is a part of all display cells without generating the write discharge in the remaining display cells in said at least one subfield of said plurality of subfields such that the sustain cycle number in said at least one subfield becomes virtually 1/N, the N being an integer equal to 2 or more.
2. The method for driving a plasma display panel according to claim 1 , wherein the sustain cycle number equal to that assigned to the other subfield is 1.
3. The method for driving a plasma display panel according to claim 2 , wherein said predetermined display cells constitute scan lines, the scan lines constituted by said predetermined display cells are provided at a ratio of one scan line in every N scan lines, and the data pulses are not impressed on the data electrodes on the remaining (N−1) scan lines.
4. The method for driving a plasma display panel according to claim 3 , wherein error diffusion is conducted only for data in the horizontal direction for said video signal.
5. The method for driving a plasma display panel according to claim 2 , wherein said predetermined display cells constitute pixels, the pixels constituted by said predetermined display cells are provided at a ratio of one pixel in every N pixels, and the data pulses are not impressed on the data electrodes for the remaining (N−1) pixels.
6. The method for driving a plasma display panel according to claim 2 , wherein said predetermined display cells constitute blocks, the blocks constituted by said predetermined display cells are provided at a ratio of one block in every N blocks, and the data pulses are not impressed on the data electrodes for the remaining (N−1) blocks.
7. The method for driving a plasma display panel according to claim 6 , wherein one data driver is connected with data electrodes for said individual blocks.
8. The method for driving a plasma display panel according to claim 1 , wherein a plurality of total sustain cycle numbers are set in advance, said method further comprising the step of selecting one of a total sustain cycle number from said plurality of the total sustain cycle numbers in association with an average peak level of said video signal before the step of impressing the data pulses associated with the video signal only on the data electrodes of said predetermined display cells.
9. The method for driving a plasma display panel according to claim 1 , wherein said predetermined display cells are changed once in every M fields, the M being an integer equal to 2 or more.
10. The method for driving a plasma display panel according to claim 9 , wherein the sustain cycle number equal to that assigned to the other subfield is 1, and the value of M is equal to the value of N.
11. A plasma display device comprising: a plasma display panel; and a drive device for using the method according to claim 1 to drive the plasma display panel.