Level shifter and display device using the same
AssigneeSamsung Mobile Display Co., Ltd.
InventorOh-Kyong Kwon
Life of this patent
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Abstract
A level shifter includes: a first transistor including a first electrode coupled to a first power source, a second electrode coupled to a first output terminal, and a control electrode coupled to a second output terminal; a second transistor including a first electrode coupled to the first power source, a second electrode coupled to the second output terminal, and a control electrode coupled to the first output terminal; a third transistor including a first electrode, and a second electrode coupled to the second output terminal; a fourth transistor including a first electrode, and a second electrode coupled to the first output terminal; a first capacitor including a first terminal and a second terminal; and a second capacitor including a first terminal and a second terminal.
Claims20
A level shifter comprising:
- a first transistor comprising a first electrode coupled to a first power source for supplying a first voltage, a second electrode coupled to a first output terminal, and a control electrode coupled to a second output terminal;
- a second transistor comprising a first electrode coupled to the first power source, a second electrode coupled to the second output terminal, and a control electrode coupled to the first output terminal;
- a third transistor comprising a first electrode receiving a first input signal, and a second electrode coupled to the second output terminal;
- a fourth transistor comprising a first electrode receiving a second input signal that is an inverted signal of the first input signal, and a second electrode coupled to the first output terminal;
- a first capacitor comprising a first terminal coupled to a control electrode of the fourth transistor, and a second terminal receiving the first input signal;
- and
- a second capacitor comprising a first terminal coupled to a control electrode of the third transistor, and a second terminal receiving the second input signal.
A level shifter comprising:
- a first transistor comprising a first electrode coupled to a first power source for supplying a first voltage, a second electrode coupled to a first output terminal, and a control electrode receiving an inversion signal of the first output terminal;
- a second transistor comprising a first electrode receiving a first input signal, and a second electrode coupled to the first output terminal;
- a first capacitor comprising a first terminal coupled to a control electrode of the second transistor, and a second terminal receiving a second input signal which is an inverted signal of the first input signal;
- and
- a third transistor comprising a control electrode receiving the second input signal, a first electrode receiving a predetermined voltage, and a second electrode coupled to the first terminal of the first capacitor.
A method for driving a level shifter including first and second transistors, the first transistor having a first electrode receiving a first input signal and a second electrode coupled to an output terminal, the second transistor having a first electrode receiving a source voltage, a second electrode coupled to the output terminal, and a control electrode receiving an inverted signal of a signal applied to the output terminal, the method comprising:
- applying a first level of the first input signal to the first electrode of the first transistor;
- applying a voltage corresponding to a sum of a second level of the first input signal and a predetermined voltage level to a control electrode of the first transistor;
- applying the second level of the first input signal to the first electrode of the first transistor;
- and
- applying a voltage corresponding to a sum of the first level and the predetermined voltage level to the control electrode of the first transistor.
A display device comprising a level shifter wherein the level shifter comprises:
- a first transistor comprising a first electrode coupled to a first power source for supplying a first voltage, a second electrode coupled to a first output terminal, and a control electrode coupled to a second output terminal;
- a second transistor comprising a first electrode coupled to the first power, a second electrode coupled to the second output terminal, and a control electrode coupled to the first output terminal;
- a third transistor comprising a first electrode receiving a first input signal, and a second electrode coupled to the second output terminal;
- a fourth transistor comprising a first electrode receiving a second input signal that is an inverted signal of the first input signal, and a second electrode coupled to the first output terminal;
- a first capacitor comprising a first terminal coupled to a control electrode of the fourth transistor, and a second terminal receiving the first input signal;
- and
- a second capacitor comprising a first terminal coupled to a control electrode of the third transistor, and a second terminal receiving the second input signal.
Dependencies are inferred from the claim text.