Driver for flat display panel
AssigneeFujitsu Limited
InventorsTomokatsu Kishi, Shigeki Kameyama, Kazuo Yoshikawa, Akira Otsuka, Tadatsugu Hirose
Life of this patent
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Abstract
A flat panel display has a low withstand voltage and performs high speed line sequential scanning and recovers power. An AC type panel display has electrodes arranged in a matrix form, a push-pull type driver circuit, having first and second transistors, provided for each pair of plural pairs, of power supply lines connected to a driver circuit for driving a plurality of display electrodes to be scanned and a power supply which supplies a defined voltage to one of the respective power supply lines of each pair connected to the corresponding driver circuit, and a leakage control switch which leaks the defined voltage applied to the power supply line.
Claims41
A driver for a panel display system comprising n scan electrodes which are independent of each other, said driver comprising:
- n driver circuits, respectively connected to said n scan electrodes;
- a power supply for supplying a voltage to each of said n driver circuits;
- and
- a leakage current control circuit which leaks current caused by said voltage applied to each of said n driver circuits.
A driving method for a panel display system comprising a plurality of driver circuits, individually and respectively connected to a plurality of scan electrodes which are independent of each other, and a power supply line, connected in common to the plurality of driver circuits for applying a predetermined voltage to the plurality of driver circuits, comprising the steps of:
- applying the predetermined voltage to the power supply line;
- and
- leaking current, caused by the predetermined voltage applied to the power supply line.
A driver for a panel display system comprising n scan electrodes which are independent of each other, said driver comprising:
- a plurality of n driver circuits provided between a first power supply line and a second power supply line and connected to the n scan electrodes;
- a first power supply circuit supplying a first electric power to the first and second power supply lines, said first electric power writing display data;
- and
- a second power supply circuit supplying a second electric power to the first and second power supply lines, said second electric power producing discharges based on the display data.
A driver circuit for a panel display system comprising a pair of electrodes defining a panel capacitance therebetween, the driver circuit being coupled to, and selectively charging and discharging, the electrodes to drive the panel display system, the driver circuit comprising:
- a first path having a first end connected to a selected electrode of the pair of electrodes and a second end connected to a node and comprising, in succession, a first coil, a first diode having an anode thereof oriented toward the selected electrode, and a first switch, the first path providing a discharge path for discharging the electrodes therethrough;
- a second path having a first end connected to the second electrode of the pair of electrodes and a second end connected to the node and comprising, in succession, a second coil, a second diode having a cathode thereof oriented toward the selected electrode, and a second switch having a first end connected to the selected electrode and a second end connected to the node, the second path providing a charging path for charging the electrodes therethrough;
- a power storage element connected to the node;
- a first clamp circuit, connected to the first path at a connection therein between the selected electrode and the first coil and clamping a potential of the first path to a first, low potential power source;
- and
- a second clamp circuit, connected to the second path at a connection therein between the selected electrode and the second coil and clamping a potential of the second path to a second, high potential power source, the high potential being higher than the low potential.
A panel display system comprising a pair of electrodes having a panel capacitance and generating discharge emissions therebetween in response to a predetermined voltage applied therebetween and a driver circuit coupled to the electrodes for driving the discharge emissions, said driver circuit comprising:
- a first path having a first end connected to a selected electrode of the pair of electrodes and a second end connected to a node and comprising, in succession, a first coil, a first diode having an anode thereof oriented toward the selected electrode and a first switch, the first path providing a discharging path for discharging the electrodes therethrough;
- a second path having a first end connected to the selected electrode and a second end connected to the node and comprising, in succession, a second coil, a second diode having a cathode thereof oriented toward the selected electrode and a second switch, the second path providing a charging path for charging the electrodes therethrough;
- a power storage element connected to the node;
- a first clamp circuit, connected to the first path at a connection therein between the selected electrode and the first coil and clamping a potential of the first path to a low potential;
- and
- a second clamp circuit, connected to the second path at a connection therein between the selected electrode and the second coil and clamping a potential of the second path to a high potential, the high potential being higher than the low potential.
A method of driving a panel display system comprising a pair of electrodes having a panel capacitance and generating discharge emissions therebetween in response to a predetermined voltage applied therebetween, the method comprising the steps of:
- i) discharging the panel capacitance of the pair of electrodes through a discharging path comprising, in sequence, a first coil and a first diode;
- ii) clamping potentials of the electrodes after step i);
- iii) reducing a potential difference between opposite end terminals of the first coil to zero, concurrently with step ii);
- iv) charging the panel capacitance of the electrodes through a charging path comprising, in sequence, a second diode and a second coil;
- v) clamping potentials of the electrodes after step iv);
- and
- vi) reducing a potential difference between opposite end terminals of the second coil to zero concurrently with step v).
Dependencies are inferred from the claim text.