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US 2004/0070577 A1Published application
Driving circuit and display device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShigeo Kigo, Hidehiko Shoji, Jumpei Hashiguchi
Life of this patent
Estimating the term…
Abstract
In a circuit driving a capacitive load Cp, current passed through a transistor Q3, a diode D1 and a recovering coil L is passed through lines L1, L2, and the inductance components of the lines L1 and L2, and the drain-source capacitances of the transistors Q1 and Q2 generate LC resonance. Capacitors C1 and C2 are connected in parallel to the drain-source regions of the transistors Q1 and Q2 to increase the total drain-source capacitance and reduce the resonance frequency, so that unwanted electromagnetic wave radiation in a frequency band affecting other electronic devices is suppressed.
Claims18
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a power supply;
- an interconnector connected to said switcher;
- and
- a frequency reducer connected in parallel with said switcher that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said switcher and an inductance component of said interconnector, wherein a potential of said power supply is applied to the electrode of the display panel through said switcher and said interconnector.
1 more element
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a power supply;
- an interconnector connected to said switcher;
- and
- a frequency reducer connected in parallel with said switcher that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said switcher and an inductance component of said interconnector to a level less than 30 MHz, wherein a potential of said power supply is applied to the electrode of the display panel through said switcher and said interconnector.
1 more element
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a power supply;
- an interconnector connected to said switcher;
- and
- a frequency reducing device having a capacitive element connected in parallel with said switcher that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said switcher and an inductance component of said interconnector, wherein a potential of said power supply is applied to the electrode of the display panel through said switcher and said interconnector.
1 more element
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a power supply;
- a first interconnector connected to said switcher;
- a protector connected to said power supply;
- a second interconnector connected to said protector and said first interconnector;
- and
- a frequency reducing device connected in parallel with said protector that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said protector and an inductance component of said second interconnector, wherein a potential of the electrode of the display panel is brought to a level that does not exceed a potential of said power supply through said protector and said second interconnector.
3 more elements
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a power supply;
- a first interconnector connected to said switcher;
- a protector including a one-way conducting element;
- a second interconnector connected to said protector and said first interconnector;
- and
- a frequency reducer connected in parallel with said protector that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said protector and an inductance component of said second interconnector, wherein a potential of the electrode of the display panel is brought to a level that does not exceed a potential of said power supply through said protector and said second interconnector.
3 more elements
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a power supply;
- a first interconnector connected to said switcher;
- a protector connected to said power supply;
- a second interconnector connected to said protector and said first interconnector;
- and
- a frequency reducer connected in parallel with said protector that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said protector and an inductance component of said second interconnector to a level less than 30 MHz, wherein a potential of the electrode of the display panel is brought to a level that does not exceed a potential of said power supply through said protector and said second interconnector.
3 more elements
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a power supply;
- a first interconnector connected to said switcher;
- a protector connected to said power supply;
- a second interconnector connected to said protector and said first interconnector;
- and
- a frequency reducer having a capacitive element connected in parallel with said protector, wherein the electrode of the display panel is brought to a potential level that does not exceed a potential of said power supply through said protector and said second interconnector.
3 more elements
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a ground;
- an interconnector connected to said switcher;
- and
- a frequency reducer connected in parallel with said switcher that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said switcher and an inductance component of said interconnector, wherein the electrode of the display panel is brought to a ground potential through said switcher and said interconnector.
1 more element
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a ground;
- an interconnector connected to said switcher;
- and
- a frequency reducer connected in parallel with said switcher that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said switcher and an inductance component of said interconnector to a level less than 30 MHz, wherein the electrode of the display panel is brought to a ground potential through said switcher and said interconnector.
1 more element
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a ground;
- an interconnector connected to said switcher;
- and
- a frequency reducer having a capacitive element connected in parallel with said switcher that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said switcher and an inductance component of said interconnector, wherein the electrode of the display panel is brought to a ground potential through said switcher and said interconnector.
1 more element
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a ground;
- a first interconnector connected to said switcher;
- a protector connected to said ground;
- a second interconnector connected to said protector and said first interconnector;
- and
- a frequency reducer connected in parallel with said protector that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said protector and an inductance component of said second interconnector, wherein the electrode of the display panel is brought to a ground potential through said protector and said second interconnector.
3 more elements
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a ground;
- a first interconnector connected to said switcher;
- a protector connected to said ground, said conductor being conductive in a single direction;
- a second interconnector connected to said protector and said first interconnector;
- and
- a frequency reducer connected in parallel with said protector that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said protector and an inductance component of said second interconnector, wherein the electrode of the display panel is brought to a ground potential through said protector and said second interconnector.
3 more elements
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a ground;
- a first interconnector connected to said switcher;
- a protector connected to said ground;
- a second interconnector connected to said protector and said first interconnector;
- and
- a frequency reducer connected in parallel with said protector that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said protector and an inductance component of said second interconnector to a level less than 30 MHz, wherein the electrode of the display panel is brought to a ground potential through said protector and said second interconnector.
3 more elements
A driving circuit that drives a display panel having an electrode, comprising:
- a switcher connected to a ground;
- a first interconnector connected to said switcher;
- a protector connected to said ground;
- a second interconnector connected to said protector and said first interconnector;
- and
- a frequency reducer having a capacitive element connected in parallel with said protector that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said protector and an inductance component of said second interconnector, wherein the electrode of the display panel is brought to a ground potential through said protector and said second interconnector.
3 more elements
A display device, comprising:
- a display panel having an electrode;
- and
- a driver that drives said electrode of said display panel, said driver comprising:
- a switcher connected to a power supply;
- an interconnector connected to said switcher;
- and
- a frequency reducer connected in parallel with said switcher that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said switcher and an inductance component of said interconnector, wherein a potential of said power supply is applied to said electrode of said display panel through said switcher and said interconnector.
4 more elements
A display device, comprising:
- a display panel having an electrode;
- and
- a driver that drives said electrode of said display panel, said driver comprising:
- a switcher connected to a power supply;
- an interconnector connected to said switcher;
- and
- a frequency reducer having a capacitive element connected in parallel with said switcher that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said switcher and an inductance component of said interconnector, wherein a potential of said power supply is applied to said electrode of said display panel through said switcher and said interconnector.
4 more elements
A display device, comprising:
- a display panel having an electrode;
- and
- a driver that drives said electrode of said display panel, said driver comprising:
- a switcher connected to a ground;
- an interconnector connected to said switcher;
- and
- a frequency reducer connected in parallel with said switcher that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said switcher and an inductance component of said interconnector, wherein said electrode of said display panel is brought to a ground potential through said switcher and said interconnector.
4 more elements
A display device, comprising:
- a display panel having an electrode;
- and
- a driver that drives said electrode of said display panel, said driver comprising:
- a switcher connected to a ground;
- an interconnector connected to said switcher;
- and
- a frequency reducer having a capacitive element connected in parallel with said switcher that is operable to reduce a resonance frequency of an LC resonance resulting from a parasitic capacitance of said switcher and an inductance component of said interconnector, wherein said electrode of said display panel is brought to a ground potential through said switcher and said interconnector.
4 more elements
Dependencies are inferred from the claim text.