PLASMA DISPLAY DEVICE

• US 20100053224A1
• Filed: 11/06/2006
• Published: 03/04/2010
• Est. Priority Date: 11/06/2006
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Matsushima, Hiroyuki, Hashimoto, Yasunobu, Kudo, Yasuyuki, Takada, Naoki
• Application Number:
  US12/439,181
• Publication Number:
  US 20100053224A1
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2320/08 Arrangements within a display terminal for setting, manually or automatically, display parameters of the display terminal
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• CPC Class Codes: G09G 3/2927 Details of initialising
• CPC Class Codes: G09G 3/293 for address discharge
• CPC Class Codes: G09G 3/296 Driving circuits for producing the waveforms applied to the driving electrodes

Abstract

The characteristics of a filter are controlled based on index information relating to the power consumption of an address driver that drives address electrodes for selecting light emission or no light emission of display cells based on display data, and filtering is performed on the display data in the arrangement sequence of display cells for a direction perpendicular to the direction in which the address electrodes extend on a display screen, thereby controlling the characteristics of the filter so as to suppress high-frequency components in the display data when the power consumption of the address driver is large to reduce the number of changes in the potentials of the address electrodes, enabling reduction of the power consumption of the address driver while suppressing image quality deterioration.

Claims

1. A plasma display device comprising:

a filter filtering display data;

a plurality of address electrodes selecting light emission or no light emission of display cells; and

an address driver driving the address electrodes based on the filtered display data,

wherein a characteristic of the filter is controlled based on index information relating to power consumption of the address driver, and the filtering is performed on the display data in an arrangement sequence of display cells for a direction perpendicular to a direction in which the address electrodes extends on a display screen displaying an image displayed based on the display data.

2. The plasma display device according to claim 1,

wherein the filtering can be performed on the display data for display cells for a same color for the direction perpendicular to the direction in which the address electrodes extends on the display screen, and

filtering the display data in the arrangement sequence of display cells or filtering the display data for display cells for a same color is selected according to the power consumption of the address driver obtained based on the index information.

3. The plasma display device according to claim 1,

wherein the filtering is performed on the display data on the display screen for the direction in which the address electrodes extends.

4. The plasma display device according to claim 1,

wherein the filter is controlled so that if it is determined based on the index information that the power consumption of the address driver is equal to or exceeds a predetermined value, a cutoff frequency is lowered so as to suppress a high-frequency component in the display data, and if it is determined that the power consumption of the address driver is lower than the predetermined value, the cutoff frequency is raised.

5. The plasma display device according to claim 1,

wherein the filtering is performed by each of display data for a plurality of sub-frames, the display data being obtained by conversion of display data for one frame.

6. The plasma display device according to claim 5,

wherein the plurality of sub-frames are classified into a group of sub-frames each having high brightness weighting and a group of sub-frames each having low brightness weighting, and the filtering is performed only on display data for a sub-frame belonging to the group of sub-frames each having low brightness weighting.

7. The plasma display device according to claim 1,

wherein the index information is the power consumption value of the address driver obtained by calculation using the display data.

8. The plasma display device according to claim 7,

wherein the display screen is divided into a plurality of areas, a power value is calculated for each of the areas, and the filtering is performed on display data for the area based on the power value.

9. The plasma display device according to claim 1,

wherein the index information is information of a current supplied to the address driver, the current being measured by a current measuring circuit.

10. The plasma display device according to claim 1,

wherein the index information is information of a temperature of the address driver, the temperature being measured by a temperature measuring circuit.