Method of driving plasma display panel and plasma display device
View Patent ↗In a PDP device, a technique capable of more efficiently performing address energy control according to contents of a display image (display data) to reduce the address energy. In the PDP device, as an address energy recovery circuit, a plurality of address energy control circuits (B 1 to Bn) are provided corresponding to a plurality (n) of regions (H 1 to Hn) into which a screen area (R) and a group of address electrodes are divided in a horizontal direction. For each of the regions (H) of which the address energy recovery circuits (B) are respectively in charge and for each of subfields, an address pulse switching load (Q) corresponding to that region (H) is determined, and then, according to the magnitude of the load (Q), the operation of the address energy recovery circuit (B) is ON/OFF-controlled.
1. A method comprising:
driving a plasma display panel to perform display on a screen area of the plasma display panel, the panel including sustain electrodes and scan electrodes in a first direction and including address electrodes in a second direction,
the method using a subfield method, where one field time period is divided into a plurality of subfields, and an address-, display-period separation method, wherein:
the screen area of the panel, a group of display lines of the panel, and a group of display columns of the panel are respectively divided into a plurality of first regions (H) in the first direction and divided into a plurality of second regions (V) in the second direction,
a plurality of address energy recovery circuit blocks are provided corresponding to the first regions (H), as an address energy recovery circuit that is connected to a group of the address electrodes of the panel and recovers energy, and
for each of the subfields and for each of the first regions (H) of which the address energy recovery circuit blocks are respectively in charge, an operation of the address energy recovery circuit block corresponding to each first region (H) is turned ON or OFF for each of the second regions (V) according to a switching load of an address pulse applied to a group of address electrodes in each second region (V).
2. The method according to claim 1 , wherein:
for each subfield and for each first region (H), the switching load of the address pulse applied to the group of address electrodes in each second region (V) is calculated based on display data, and
the operation of the address energy recovery circuit block corresponding to each first region (H) is turned ON when the calculated switching load is larger than or equal to a threshold value and is turned OFF when the calculated switching load is smaller than the threshold value.
3. A plasma display device for performing display with a subfield technique, where one field time period is divided into a plurality of subfields, and an address-, display-period separation method, the plasma display device comprising:
a plasma display panel including sustain electrodes and scan electrodes in a first direction and including address electrodes in a second direction, wherein a group of the sustain electrodes, scan electrodes and address electrodes configures a screen area to have a display cell matrix, a group of display lines, and a group of display columns; and
a control circuit configured to perform driving control of the panel, wherein:
the screen area of the panel, the group of display lines of the panel, and the group of display columns of the panel are respectively divided into a plurality of first regions (H) in the first direction and divided into a plurality of second regions (V) in the second direction,
the control circuit includes an address driving circuit and an address energy recovery circuit which are connected to a group of address electrodes of the panel,
the address driving circuit applies a group of address pulses to the group of address electrodes of the panel during an address period of one of the subfields according to display data,
the address energy recovery circuit includes a coil and an LC resonant control switch and recovers energy from the group of address electrodes with an LC resonant operation between an inductance of the coil and a capacitance of the panel,
as the address energy recovery circuit, a plurality of address energy recovery circuit blocks are provided corresponding to the first regions (H), and
for each of the subfields and for each of the first regions (H) of which the address energy recovery circuit blocks are respectively in charge, the control circuit turns ON or OFF, for each of the second regions (V), an operation of the address energy recovery circuit block corresponding to each first region (H) according to a switching load of an address pulse applied to a group of address electrodes in each second region (V).
4. The plasma display device according to claim 3 , wherein:
for each subfield and for each first region (H), the control circuit calculates, based on display data, the switching load of the address pulse applied to the group of address electrodes in each second region (V), and
the control circuit turns ON the operation of the address energy recovery circuit block corresponding to each first region (H) when the calculated switching load is larger than or equal to a threshold value, and turns OFF the operation of the address energy recovery circuit block corresponding to each first region (H) when the calculated switching load is smaller than the threshold value.