Driving method of gas-discharge display panel

• US 4,476,466 A
• Filed: 05/01/1981
• Issued: 10/09/1984
• Est. Priority Date: 05/09/1980
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Okamoto, Yukio, Sumioka, Atsushi, Mitani, Eisuke
• Primary Examiner(s): Curtis, Marshall M.
• Application Number:
  US06/259,472
• Time in Patent Office: 1,257 Days
• Field of Search: 340/768, 340/769, 340/770, 340/792, 340/805, 340/811
• US Class Current: 345/68
• CPC Class Codes: G09G 3/285 using self-scanning
• CPC Class Codes: G09G 3/29 using self-shift panels with sequential transfer of the discharges from an input position to a further display position

Abstract

A method of driving a gas-discharge panel having at least one reset electrode and cathode and anode groups for forming N electrode pairs. The cathodes are p-phase connected (p≧3) while the anodes are m-phase connected (m≦p). The reset electrode is applied with a reset pulse voltage having a period of T of one frame. Cathode pulse voltages having their pulse widths of (p-1)T/N are successively applied to the cathodes for respective p phases with a phase shift of T/N to each other while anode pulse voltages having their pulse widths of at maximum (m-1)T/N are successively applied to the anodes for respective m phases with a phase shift of T/N to each other. A reset discharge which is generated by the reset pulse voltage and the first one of the cathode pulse voltages and anode pulse voltages applied for each frame and having a value cooperating with the reset pulse voltage value is successively transferred by means of the cathode and anode voltages to display desired information. As a result, the display luminance can be improved (p-1) times without impairing the self-scanning function.

Claims

1. A method of driving a gas-discharge panel having (i) at least one reset electrode, (ii) first and second electrode groups for forming N electrode pairs, the electrodes of said first electrode group being wired in a p-phase connection and the electrodes of said second electrode group being wired in an m-phase connection, p being an integer of 3≦

p≦

N and m being a positive integer not greater then p, and (iii) current limiting resistor means connected to one of said first and second electrode groups, comprising the steps of;

(a) applying at least one reset pulse voltage having a maximum pulse width of (m-1)T/N to said reset electrode at the beginning of each frame of period T, the reset pulse voltage having a predetermined value with respect to a reference value;

(b) successively applying cathode pulse voltages with their pulse widths of (p-1)T/N to the respective p-phase electrode connections of said first electrode group with a phase shift of T/N to each other, the cathode pulse voltages having a value smaller than the reference value; and

(c) successively applying anode pulse voltages with their maximum pulse width of (m-1)T/N to the respective m-phase electrode connections of said second electrode group with a phase shift of T/N to each other, the anode pulse voltages having a value larger than the reference value, said anode and cathode pulse voltage values differing from said reference value sufficiently to support discharge,

whereby a reset discharge generated by said reset pulse voltage and the first one of said cathode and anode pulse voltages applied for each frame is successively transferred by means of said cathode and anode pulse voltages to display desired information.

2. A method according to claim 1, wherein m is equal to p and each of said anode pulse voltages has a pulse width of (p-1)T/N.

3. A method according to claim 1, wherein m is equal to p and said anode pulse voltages having pulse widths of T/N and (p-1)T/N are alternately applied to the respective electrode connections of said second electrode group.

4. A method according to claim 1, wherein m is equal to p and each of said anode pulse voltages has a pulse width of (p-2)T/N.

5. A method according to claim 4, wherein p and m are both equal to 4 and each of said cathode pulse voltages has a pulse width of 3T/N while each of said anode pulse voltages has a pulse width of 2T/N.

6. A method according to claim 1, wherein m is equal to (p-1) and each of said anode pulse voltages has a pulse width of (p-2)T/N.

7. A method according to claim 1, wherein m is equal to 2 and each of said anode pulse voltages has a pulse width of T/N.

8. A method according to claim 7, wherein the pulse width of said cathode pulse voltage is varied to provide a luminance modulation.

9. A method according to any one of claims 1 to 8, wherein said reset pulse voltage is a positive pulse voltage having the same pulse width as said anode pulse voltage, the first one of said cathode pulse voltages being applied for each frame to the first phase of the p-phase electrode connections of said first electrode group inphase with said reset pulse voltage, and the first of said anode pulse voltages being applied for each frame to the first phase of the m-phase electrode connections of said second electrode group with its phase delayed from the phase of said reset pulse voltage of T/N, whereby said reset discharge is generated by said pulse voltage and the first one of said cathode pulse voltage.

10. A method according to any one of claims 1 to 8, wherein the number of pulses in said anode pulse voltages applied to said second electrode group is limited to control the display of information.

11. A method according to claim 9, wherein the number of pulses in said anode pulse voltages appled to said second electrode group is limited to control the display of information.