Method for driving a gas electric discharge device

• US 6,456,263 B1
• Filed: 01/05/1999
• Issued: 09/24/2002
• Est. Priority Date: 06/05/1998
• Status: Expired due to Term

• Current Assignee: Maxell, Ltd.
• Original Assignee: Fujitsu Limited
• Inventors: Awamoto, Kenji, Hashimoto, Yasunobu, Iwasa, Seiichi, Yoneda, Yasushi
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): Tran, Henry N.
• Application Number:
  US09/227,082
• Time in Patent Office: 1,358 Days
• Field of Search: 345/60, 345/62, 345/63, 345/67, 345/68, 345/66, 345/204, 345/206, 345/690-692, 315/169.1, 315/169.4
• US Class Current: 345/60
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 2310/066 Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
• CPC Class Codes: G09G 2320/0228 Increasing the driving margin in plasma displays
• CPC Class Codes: G09G 2320/0238 Improving the black level
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/2096 Details of the interface to the display terminal specific for a flat panel suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167
• CPC Class Codes: G09G 3/2927 Details of initialising
• CPC Class Codes: G09G 3/293 for address discharge
• CPC Class Codes: G09G 3/294 for lighting or sustain discharge
• CPC Class Codes: G09G 3/298 using surface discharge panels
• CPC Class Codes: G09G 3/3662 using plasma-addressed liquid crystal displays

Abstract

A method for driving a gas electric discharge device which has a first electrode and a second electrode and is constructed such that a wall voltage is capable of being produced between the first and second electrodes. The method includes applying a voltage monotonously rising from a first set value to a second set value, between the first and second electrodes, thereby to generate a plurality of gas electric discharges so as to decrease the wall voltage for charge adjustment during the voltage rise.

Claims

1. A method for driving a gas electric discharge device having a first electrode and a second electrode for a gas electric discharge, which device is operable to produce a wall voltage between the first electrode and the second electrode, the method comprising:

applying a voltage, monotonously rising from a first set value to a second set value, between the first electrode and the second electrode thereby to generate a plurality of gas electric discharges so as to decrease the wall voltage for charge adjustment during the voltage rise, wherein;

the first set value is set such that the sum of the first set value and the wall voltage at the beginning of applying the monotonously rising voltage is lower than or equal to a firing voltage, and

the second set value is set such that the sum of the second set value and the wall voltage at the beginning of applying the monotonously rising voltage is higher than the firing voltage, and the rate of rise from the first voltage to the second voltage is a value within a range such that said plurality of gas electric discharges are generated as feeble electric discharges occurring intermittently and which do not reverse the polarity of the wall voltage.

2. The method according to claim 1, wherein the rate of rise from the first set voltage to the second set voltage is further limited within a range such that a different value of effective voltage with respect to a discharge current is negative at at least one point during the voltage rise, the effective voltage being the sum of the applied rising voltage and the wall voltage.

3. The method according to claim 1, wherein the maximum limit of the rate of rise from the first set voltage to the second set voltage is 10 V/μ

s.

4. A method for driving a gas electric discharge device having a plurality of cells each defining a unit electric discharge area and each having a first electrode and a second electrode for a gas electric discharge, which device is operable to produce a wall voltage between the first electrode and the second electrode, the method comprising:

as preparation for generating a gas electric discharge of a predetermined intensity, commonly applying a voltage, monotonously rising from a first set value to a second set value, between the first electrode and the second electrode, thereby to generate a plurality of gas electric discharges in each cell so as to decrease the wall voltage for charge adjustment during the voltage rise, wherein;

the first set value is set such that the sum of the first set value and the wall voltage at the beginning of applying the monotonously rising voltage is lower than or equal to a firing voltage, and

the second set value is set such that the sum of the second set value and the wall voltage at the beginning of applying the monotonously rising voltage is higher than the firing voltage, and the rate of rise from the first voltage to the second voltage is a value within a range such that said plurality of gas electric discharges are generated as feeble electric discharges occurring intermittently and which do not reverse the polarity of the wall voltage.

5. A method for driving a gas electric discharge device having a plurality of cells defining a display screen and each having a scan electrode for line selection and a data electrode for column selection crossed each other, in which at least one of the scan electrode and the data electrode is covered with a dielectric layer for generating a wall voltage, the method comprising:

a repeated execution of address preparation for rendering uniform a charge distribution on the display screen, addressing for producing a charge distribution in accordance with a content of display, and illumination sustainment for generating a gas electric discharge periodically by applying an alternating current, wherein;

the address preparation includes charge production for producing a state such that wall voltages of the same polarity are present in all the cells and charge adjustment by commonly applying a voltage monotonously rising from a first set value to a second set value, between the scan and the data electrode in each cell, thereby to generate a plurality of gas electric discharges in the cell so as to decrease the wall voltage for charge adjustment during the voltage rise,

the first set value is set such that the sum of the first set value and the wall voltage at the beginning of applying the monotonously rising voltage is lower than or equal to a firing voltage, and

the second set value is set such that the sum of the second set value and the wall voltage at the beginning of applying the monotonously rising voltage is higher than the firing voltage, and the rate of rise from the first voltage to the second voltage is a value within a range such that said plurality of gas electric discharges are generated as feeble electric discharges occurring intermittently and which do not reverse the polarity of the wall voltage.

6. The method according to claim 5, wherein a voltage pulse in a ramp waveform whose polarity is opposite that of the voltage applied in the charge adjustment is applied to all the cells in the charge production of the address preparation.

7. The method according to claim 5, wherein a voltage pulse in a rectangular waveform whose polarity is opposite that of the voltage applied in the charge adjustment is applied to all the cells in the charge production of the address preparation.

8. The method according to claim 5, wherein a voltage pulse in a gentle waveform is applied to all the cells in the charge adjustment of the address preparation.

9. The method according to claim 5, wherein a voltage pulse in a stepwise waveform whose voltage rises stepwise is applied to all the cells in the charge adjustment of the address preparation.

10. The method according to claim 5, wherein, in the addressing, a gas electric discharge is generated only in a cell in which a gas electric discharge is to be generated in the illumination sustainment.

11. The method according to claim 5, wherein, in the addressing, a gas electric discharge is generated only in a cell in which a gas electric discharge is not to be generated in the illumination sustainment.

12. The method according to claim 5, wherein a field which represents display data is composed of a plurality of sub-fields each assigned a weight of luminance, the address preparation, the addressing and the illumination sustainment are executed in each of the sub-fields, and the number of gas electric discharges in the illumination sustainment is set on a one-by-one basis.

13. A method for driving a gas electric discharge device having a plurality of cells defining a display screen and each having a first main electrode and a second main electrode arranged in parallel to form an electrode pair for generating a surface electric discharge, in which at least one of the first main electrode and the second main electrode is covered with a dielectric layer for generating a wall voltage, the method comprising:

a repeated execution of address preparation for rendering uniform a charge distribution on the display screen, addressing for producing a charge distribution in accordance with a content of display and illumination sustainment for generating a gas electric discharge periodically by applying an alternating current, wherein;

the address preparation includes charge production for producing a state such that wall voltages of the same polarity are present in all the cells and charge adjustment by commonly applying a voltage, monotonously rising from a first set value to a second set value, between the first and the second main electrode in each cell, thereby to generate a plurality of gas electric discharges in the cell so as to decrease the wall voltage for charge adjustment while the voltage rise,

the first set value is set such that the sum of the first set value and the wall voltage at the beginning of applying the monotonously rising voltage is lower than or equal to a firing voltage, and

the second set value is set such that the sum of the second set value and the wall voltage at the beginning of applying the monotonously rising voltage is higher than the firing voltage, and the rate of rise from the first voltage to the second voltage is a value within a range such that said plurality of gas electric discharges are generated as feeble electric discharges occurring intermittently and which do not reverse the polarity of the wall voltage.

14. The method according to claim 13, wherein a voltage pulse in a ramp waveform whose polarity is opposite that of the voltage applied in the charge adjustment is applied to all the cells in the charge production of the address preparation.

15. The method according to claim 13, wherein a voltage pulse in a rectangular waveform whose polarity is opposite that of the voltage applied in the charge adjustment, is applied to all the cells in the charge production of the address preparation.

16. The method according to claim 13, wherein a voltage pulse in a gentle waveform is applied to all the cells in the charge adjustment of the address preparation.

17. The method according to claim 13, wherein a voltage pulse in a stepwise waveform whose voltage rises stepwise is applied to all the cells in the charge adjustment of the address preparation.

18. The method according to claim 13, wherein, in the addressing, a gas electric discharge is generated only in a cell in which a gas electric discharge is to be generated in the illumination sustainment.

19. The method according to claim 13, wherein, in the addressing, a gas electric discharge is generated only in a cell in which a gas electric discharge is not to be generated in the illumination sustainment.

20. The method according to claim 13, wherein a field which represents display data is composed of a plurality of sub-fields each assigned a weight of luminance, the address preparation, the addressing and the illumination sustainment are executed in each of the sub-fields, and the number of gas electric discharges in the illumination sustainment is set on a one-by-one basis.