Driving apparatus for driving a plasma display panel based on power consumed during a non-light emitting period of a unit display period

• US 6,496,165 B1
• Filed: 06/20/2000
• Issued: 12/17/2002
• Est. Priority Date: 07/01/1999
• Status: Expired due to Fees

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Pioneer Corporation
• Inventors: Hosoi, Kenichiro, Sato, Naruhiro, Ide, Shigeo
• Primary Examiner(s): Chow, Dennis-Doon
• Assistant Examiner(s): AWAD, AMR A
• Application Number:
  US09/597,094
• Time in Patent Office: 910 Days
• Field of Search: 345/60-72, 345/690, 345/211, 345/212, 345/213, 315/169.1, 315/169.4
• US Class Current: 345/60
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2944 by varying the frequency of sustain pulses or the number of sustain pulses proportionally in each subfield of the whole frame
• CPC Class Codes: G09G 3/296 Driving circuits for producing the waveforms applied to the driving electrodes

Abstract

A driving apparatus of a plasma display panel which is capable of reducing the scale of the driver itself while limiting power consumed by the plasma display panel. The value of power consumed during a non-light emitting period in one field (frame) period is added to an average luminance level of an input video signal to derive average power consumption, and the power consumed by the plasma display panel is controlled on the basis of the average power consumption.

Claims

1. A driving apparatus for a plasma display panel having a plurality of discharge cells arranged in a matrix, wherein a unit display period for each of said discharge cells is divided into a light emitting period and a non-light emitting period in accordance with an input video signal for driving said plasma display panel, such that said discharge cells are driven to repeatedly emit light only during said light emitting period to provide a display at a half-tone luminance, said driver comprising:

power consumption control means for obtaining a first electric power consumption value corresponding to light emissions by said input video signal and a second electric power consumption value representing electric power consumption by sustaining pulses that are applied without causing light emissions, based on an average luminance level of said input signal and the number of sustain pulses applied in said non-light emitting period, adding said first and second electric power consumption values to obtain an average power consumption, and controlling power consumption of said plasma display panel based on said average power consumption.

2. A driving apparatus of a plasma display panel according to claim 1, wherein said power consumption control means attenuates said input video signal when said average power consumption is larger than a predetermined reference power consumption.

3. A driving apparatus of a plasma display panel according to claim 1, wherein said power consumption control means reduces the number of times said discharge cells are driven to repeatedly emit light during said light emitting period when said average power consumption is larger than said predetermined reference power consumption.