FLAT DISPLAY PANEL HAVING INTERNAL POWER SUPPLY CIRCUIT FOR REDUCING POWER CONSUMPTION

• US 20090303221A1
• Filed: 08/12/2009
• Published: 12/10/2009
• Est. Priority Date: 11/19/1993
• Status: Abandoned Application

• Current Assignee: Hitachi Plasma Patent Licensing Company Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi Plasma Patent Licensing Company Limited (Hitachi, Ltd.)
• Inventors: Matsui, Naoki, TOMIO, Shigetoshi, Yao, Shinpei
• Application Number:
  US12/540,136
• Publication Number:
  US 20090303221A1
• Time in Patent Office: Days
• US Class Current: 345/212
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2310/063 Waveforms for resetting the whole screen at once
• 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 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 2330/04 Display protection
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/288 using AC panels
• CPC Class Codes: G09G 3/2927 Details of initialising
• CPC Class Codes: G09G 3/294 for lighting or sustain discharge
• 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: G09G 3/297 using opposed discharge type panels

Abstract

A flat display employs at least one high voltage different from logic voltages. The display has a voltage detection unit and a drive control signal control unit. The voltage detection unit is used to detect the high voltage. The drive control signal control unit is used to control drive control signals of the flat display in accordance with the detected high voltage. This arrangement eliminates charging currents that are applied to a display panel but have nothing to do on the actual displaying of data, or reactive currents due to unnecessary switching operations, thereby reducing power consumption.

Claims

1. A flat display device having a display panel in which a plurality of X and Y electrodes are disposed adjacently each other, and a plurality of address electrodes are disposed intersecting to the X and Y electrodes, the flat display device comprising:

a detection unit which detects an existence and non-existence of an external input signal or an input display data; and

a drive control unit which controls applying a drive waveform to said X electrodes, said Y electrodes and said address electrodes;

wherein when said detection unit detects non-existence of the external input signal or the input display data, said drive control unit controls to stop applying at least a part of said drive waveform applied to said X electrodes, said Y electrodes and said address electrodes.

2. A flat display device according to the claim 1, wherein:

said detection unit detects said non-existence of the external input signal or the input display data, when the input signal or the display data is not input for a predetermined time.

3. A flat display device according to the claim 1, wherein:

when the detection unit detects said non-existence of the external input signal or the input display data, the detection unit control to stop applying whole of the said drive waveform applied to said X electrodes, said Y electrodes and said address electrodes.

4. A flat display device according to the claim 2, wherein:

when the detection unit detects said non-existence of the external input signal or the input display data, the detection unit control to stop applying whole of the said drive waveform applied to said X electrodes, said Y electrodes and said address electrodes.

5. A method of driving a flat display device having a display panel in which a plurality of X and Y electrodes are disposed adjacently each other, and a plurality of address electrodes are disposed intersecting to the X and Y electrodes, the method comprising:

detecting an existence and non-existence of an external input signal or an input display data; and

controlling to stop applying at least a part of said drive waveform applied to said X electrodes, said Y electrodes and said address electrodes, when non-existence of the external input signal or the input display data is detected.

6. A method of driving a flat display device according to the claim 5, wherein:

detecting said non-existence of the external input signal or the input display data, when the input signal or the display data is not input for a predetermined time.

7. A method of driving a flat display device according to the claim 5, wherein:

controlling to stop applying whole of the said drive waveform applied to said X electrodes, said Y electrodes and said address electrodes, when said no existence of the external input signal or the input display data is detected.

8. A method of driving a flat display device according to the claim 6, wherein:

controlling to stop applying whole of the said drive waveform applied to said X electrodes, said Y electrodes and said address electrodes, when said no existence of the external input signal or the input display data is detected.