# US 7,609,232 B2 · Plasma display device

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- Number: US 7,609,232 B2
- Document ID: US7609232B2
- Status: Granted
- Kind: B2
- Application number: 11/280,271
- Filed: 2005-11-17
- Published: 2006-05-25
- Granted: 2009-10-27
- Earliest claimed: 2004-11-24
- Assignees: Panasonic Corporation
- Inventors: Kazuaki Sakata
- Web page: https://patentgrep.com/patent/US7609232B2

## CPC

- G09G 3/2965: {using inductors for energy recovery}
- G09G 3/294: for lighting or sustain discharge
- G09G 3/2946: {by introducing variations of the frequency of sustain pulses within a frame or non-proportional variations of the number of sustain pulses in each subfield}
- G09G 2310/066: Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
- G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
- G09G 2330/025: Reduction of instantaneous peaks of current
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A plasma display device in which in a sustain period for each subfield, a time point to clamp to a second potential a sustain pulse belonging to a first group including a sustain pulse to be first applied is delayed comparing to a time point to clamp to the second potential a sustain pulse belonging to other groups.

## Claims

### Claim 1

A plasma display device for displaying an image on a plasma display panel in accordance with an input video signal, said plasma display panel having a plurality of row electrode pairs, a plurality of column electrodes intersecting with said plurality of row electrode pairs and forming display cells at the intersections, respectively, and a display period for one field of the input video signal is configured of a plurality of subfields each formed of an address period and a sustain period for the image display, said plasma display device comprising:
a magnesium oxide layer formed at a portion facing said discharge space in each of said display cells, having magnesium oxide monocrystals which are excited by irradiating an electron beam to emit cathode luminescence light having a peak within a wavelength range of 200 to 300 nm, and which have a particle diameter of 2000 angstroms or greater;
an address portion which selectively generates address discharge in each of said display cells in accordance with pixel data based on the video signal in the address period;
a sustain portion which applies a sustain pulse between row electrodes forming each of said row electrode pairs in said sustain period; and
a reset portion which applies a reset pulse between the row electrodes forming said row electrode pair before the address period for at least one subfield in one field of a display period in order to generate reset discharge in all of said display cells,
wherein said sustain portion includes:
a first transition portion which makes resonance transition of a potential of a row electrode of each of said row electrode pairs from a first potential to a second potential;
a clamp portion which clamps the potential of said row electrode to said second potential; and
a second transition portion which makes resonance transition of the potential of said row electrode from said second potential to said first potential, and
wherein a first step of making transition from said first potential to said second potential, a second step of clamping to said second potential, and a third step of making transition from said second potential to said first potential are sequentially implemented in order to generate said sustain pulse, and
in said sustain period for each of the subfields, a time point to clamp to said second potential at least one sustain pulse belonging to a first group including a sustain pulse to be first applied is delayed comparing to a time point to clamp to said second potential a sustain pulse belonging to other groups.

### Claim 2 (depends on 1)

The plasma display device according to claim 1, wherein said sustain portion moves to the second step before the potential of the row electrode reaches the second potential at said first step when generating the sustain pulse belonging to said first group, and moves to the second step after the potential of the row electrode reaches the second potential at said first step when generating the sustain pulse belonging to said other groups.

### Claim 3 (depends on 1)

The plasma display device according to claim 1, wherein said magnesium oxide monocrystals are generated by vapor phase oxidation of magnesium steam that is generated by heating magnesium.

### Claim 4 (depends on 1)

The plasma display device according to claim 1, wherein said magnesium oxide monocrystals emit cathode luminescence light having a peak within a wavelength range of 230 to 250 nm.

### Claim 5 (depends on 1)

The plasma display device according to claim 1, wherein said magnesium oxide layer is formed on a dielectric layer which covers each of said row electrode pairs.

### Claim 6 (depends on 1)

The plasma display device according to claim 1, wherein said reset portion generates reset discharge only in the address period for a starting subfield in one field; and
said address portion implements selective discharge only in the address period for one of the subfields in one field with respect to each of the display cells.