Capacitive-load driving circuit and plasma display apparatus using the same

• US 8,928,646 B2
• Filed: 12/14/2011
• Issued: 01/06/2015
• Est. Priority Date: 09/29/2000
• Status: Expired due to Fees

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi Maxell Limited (Hitachi, Ltd.)
• Inventors: Sano, Yuji, Takagi, Akihiro, Kishi, Tomokatsu, Kawada, Toyoshi, Inoue, Hirokazu
• Primary Examiner(s): Leiby, Christopher E
• Application Number:
  US13/325,983
• Publication Number:
  US 20120081350A1
• Time in Patent Office: 1,119 Days
• Field of Search: 345/41, 345/46, 345 60- 72, 345/211, 3151691-1694, 313483-491
• US Class Current: 345/211
• CPC Class Codes: G09G 2310/0289 Details of voltage level shifters arranged for use in a driving circuit
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/045 Protection against panel overheating
• CPC Class Codes: G09G 3/28 using luminous gas-discharge panels, e.g. plasma panels
• CPC Class Codes: G09G 3/296 Driving circuits for producing the waveforms applied to the driving electrodes
• CPC Class Codes: G09G 3/2965 using inductors for energy recovery
• CPC Class Codes: H01J 11/26 Address electrodes
• CPC Class Codes: H05B 44/00 Circuit arrangements for operating electroluminescent light sources for operating light emitting diodes H05B45/00

Abstract

A plasma display apparatus including a capacitive load and a driving circuit is provided. The plasma display apparatus includes a driving power source supplying a drive voltage to the capacitive load and a reference potential terminal supplying a reference potential to the capacitive load. A drive IC is coupled to the driving power source.

Claims

1. A plasma display apparatus having a plurality of capacitive loads and a driving circuit, comprising:

a driving power source directly connected to a resistor along a first path, the driving power source supplies a drive voltage to the capacitive load;

a reference potential terminal supplying a reference potential to the capacitive load along a second path; and

a drive IC having;

a first input terminal directly connected to the resistor and receiving an input from the driving power source via the resistor along the first path, the drive IC distributing power to the capacitive load along a third path,

a second input terminal directly coupled to the reference potential terminal,

first and second switching devices, the first switching device being coupled to the first input terminal, and the second switching device being coupled to the second input terminal, and

an output terminal, connected to each of the first and second switching devices, which selectively outputs the drive voltage or the reference potential by switching the first and second switching devices,

wherein each of the first and second switching devices has two main terminal and a control terminal and an electrical connection state between the two main terminals is turned ON/OFF according to signals inputted to the control terminal,

wherein one of the two main terminals of the first switching device is directly coupled to the first input terminal and the other of the two main terminals of the first switching device is coupled to the output terminal, one of the two main terminals of the second switching device is directly coupled to the second input terminal and the other of the two main terminals of the second switching device is coupled to the other of the terminals of the first switching device and the output terminal, and the drive voltage and the reference potential are selectively supplied t the capacitive load via the output terminal according to control signals inputted to control terminals of the first and second switching devices,

wherein the drive IC includes one each of the first input terminal and the second input terminal, n (n is an integer larger than or equal to

     2) each of the first and second switching devices and the output terminals, and each of the n sets of the first and second driving devices and the output terminals correspond to each of n loads of the capacitive loads, and

the drive voltage is supplied to each of the plurality of capacitive loads corresponding to each of the n sets from the driving power source via the resistor, the first input terminal, the each first switching device of the n sets, and the output terminal,

each of the first switching device and the second switching device is formed of one transistor, and

a drive voltage is supplied to one of the two main terminals of the one transistor forming the first switching device via the resistor and a first input terminal in the first path and the first input terminal.

2. The plasma display apparatus as claimed in claim 1, wherein:

the plasma display apparatus is a three-electrode surface-discharge AC plasma display apparatus in which address electrodes are formed on a first substrate and X and Y electrodes are formed on a second substrate;

the drive IC applies addressing voltage pulses to the address electrodes; and

the plasma display apparatus has a plurality of the drive ICs and the resistor is inserted between the driving power source and each of the drive ICs.

3. The plasma display apparatus as claimed in claim 1, wherein the driving circuit is used as a driving circuit for driving address electrodes.

4. The plasma display apparatus as claimed in claim 3, wherein:

the plasma display apparatus is a three-electrode surface-discharge AC plasma display apparatus in which the address electrodes are formed on a first substrate and X and Y electrodes are formed on a second substrate; and

a thickness of a conductive layer of each of the address electrodes in a vertical direction to a plane of the first substrate is reduced to one half or less of the thickness of a conductive layer, of the same material, of each of the X and Y electrodes.

5. The plasma display apparatus as claimed in claim 3, wherein:

the plasma display apparatus is a three-electrode surface-discharge AC plasma display apparatus in which the address electrodes are formed on a first substrate and X and Y electrodes are formed on a second substrate; and

each of the address electrodes is formed by a single conductive metal layer.

6. The plasma display device as claimed in claim 1,

wherein the resistor has resistive impedance that is larger than or equal to 1/10 of an impedance having a value of 1/n of an impedance that is obtained when one output terminal out of the n output terminals and the first input terminal included in the drive IC are being conducted.

7. A plasma display apparatus having a plurality of capacitive loads and a driving circuit, comprising:

a plurality of driving devices driving a plurality of capacitive loads in an integrated-circuit form;

a driving power source directly connected to a resistor along a first path, the driving power source supplies a drive voltage to the capacitive loads;

a reference potential source supplying a reference potential to the capacitive loads along a second path,

wherein the integrated circuit includes;

a first input terminal coupled to the driving power source via the resistor and to receive an input from the driving power for distributing power consumption of the integrated circuit due to applied voltage from the driving power source to the capacitive load along a third path,

one second input terminal directly coupled to the reference potential terminal, and

a plurality of output terminals respectively corresponding to the plurality of driving devices,

wherein each of the plurality of driving devices includes a first switching device and a second switching device,

each of the first and second switching devices has two main terminals and a control terminal and an electrical connection state between the two main terminals is turned ON/OFF by a signal inputted to the control terminal,

one of the two main terminals of the first switching device is directly coupled to the first input terminal and the other of the two main terminals of the first switching device is coupled to the output terminal; and

one of the two main terminals of the second switching device is directly coupled to the second input terminal and the other of the main terminals of the second switching device is coupled to the other of the main terminals of the first and the output terminal, and the drive voltage and the reference potential are selectively supplied to the capacitive load along the third path via the output terminal according to control signals inputted to control terminals of the first and second switching devices, and

wherein the drive voltage is supplied to each of the plurality of capacitive loads corresponding to each of the plurality of driving devices from the driving power source via the resistor, the first input terminal, each of the first switching devices of the plurality of driving devices, and the output terminal,

each of the first switching device and the second switching device is formed of one transistor, and

a drive voltage is supplied to one of the two main terminals of the one transistor forming the first switching via the resistor and a first input terminal in the first path and the first input terminal.

8. The plasma display apparatus as claimed in claim 7, wherein:

the plasma display apparatus is a three-electrode surface-discharge AC plasma display apparatus in which address electrodes are formed on a first substrate and X and Y electrodes are formed on a second substrate;

the plurality of driving devices form a drive IC which applies addressing voltage pulses to the address electrodes; and

the plasma display apparatus has a plurality of the drive ICs and the resistor is inserted between the driving power source and each of the drive ICs.

9. The plasma display apparatus as claimed in claim 7, wherein the driving circuit comprises a driving circuit to drive address electrodes.

10. The plasma display apparatus as claimed in claim 9, wherein:

the plasma display apparatus is a three-electrode surface-discharge AC plasma display apparatus in which the address electrodes are formed on a first substrate and X and Y electrodes are formed on a second substrate; and

a thickness of a conductive layer of each of the address electrodes in a vertical direction to a plane of the first substrate is reduced to one half or less of the thickness of a conductive layer of the same material as the conductive layer of each of the X and Y electrodes.

11. The plasma display apparatus as claimed in claim 9, wherein:

the plasma display apparatus is a three-electrode surface-discharge AC plasma display apparatus in which the address electrodes are formed on a first substrate and X and Y electrodes are formed on a second substrate; and

each of the address electrodes is formed by a single conductive metal layer.

12. The plasma display device as claimed in claim 7,

wherein the plurality of driving devices made into an IC have a number m (m is an integer larger than or equal to 2) output terminals, and

the resistor has resistive impedance that is larger than or equal to 1/10 of an impedance having a value of 1/m of an impedance that is obtained when one out of the m output terminals and the first input terminal are being conducted.