Level Shifter, and Source Driver, Gate Driver and Display Device Including the Same

A level shifter comprising:

• an input unit comprising (i) a first input transistor having a first gate configured to receive a first input signal, a first source, and a first drain connected between a first connection node and a first node configured to receive a first voltage, and (ii) a second input transistor having a second gate configured to receive a second input signal, a second source, and a second drain connected between a second connection node and the first node;
• an output unit comprising (i) a first output transistor having a third gate connected to a first output terminal, a third source, and a third drain connected between a second node configured to receive a second voltage and a second output terminal, and (ii) a second output transistor having a fourth gate connected to the second output terminal, a fourth source, and a fourth drain connected between the second node and the first output terminal;
• a first bias unit comprising (i) a first bias transistor having a gate configured to receive a first bias signal, a source, and a drain connected between the first connection node and the second output terminal, and (ii) a second bias transistor having a gate configured to receive the first bias signal, a source, and a drain connected between the second connection node and the first output terminal;
• a second bias unit comprising (i) a third bias transistor having a gate configured to receive a second bias signal, a source, and a drain connected between the first output transistor and the second output terminal, and (ii) a fourth bias transistor having a gate configured to receive the second bias signal, a source, and a drain connected between the second output transistor and the first output terminal;
• a first switch configured to supply the first voltage to the first connection node based on or in response to a first control signal;
• and
• a second switch configured to supply the first voltage to the second connection node based on or in response to the first control signal.

A level shifter, comprising:

• an input unit comprising (i) a first input transistor having a first gate configured to receive a first input signal, a first source, and a first drain connected between a first connection node and a first node configured to receive a first voltage, and (ii) a second input transistor having a second gate configured to receive a second input signal, a second source, and a second drain connected between a second connection node and the first node;
• an output unit comprising (i) a first output transistor having a third gate connected to a first output terminal, a third source, and a third drain connected between a second node configured to receive a second voltage and a second output terminal, and (ii) a second output transistor having a fourth gate connected to the second output terminal, a fourth source, and a fourth drain connected between the second node and the first output terminal;
• a first bias unit comprising (i) a first bias transistor having a gate configured to receive a first bias signal, a source, and a drain connected between the first connection node and the second output terminal, and (ii) a second bias transistor having a gate configured to receive the first bias signal, a source, and a drain connected between the second connection node and the first output terminal;
• a second bias unit comprising (i) a third bias transistor having a gate configured to receive a second bias signal, a source, and a drain connected between the first output transistor and the second output terminal, and (ii) a fourth bias transistor having a gate configured to receive the second bias signal, a source, and a drain connected between the second output transistor and the first output terminal;
• and
• a first switch connected between the second output terminal and a third node, configured to receive a predetermined first supply voltage and supply the predetermined first supply voltage based on or in response to a first control signal.

A level shifter, comprising:

• an input unit comprising (i) a first input transistor having a first gate configured to receive a first input signal, a first source, and a first drain connected between a first connection node and a first node configured to receive a first voltage, and (ii) a second input transistor having a second gate configured to receive a second input signal, a second source, and a second drain connected between a second connection node and the first node;
• an output unit comprising (i) a first output transistor having a third gate connected to a first output terminal, a third source, and a third drain connected between a second node configured to receive a second voltage and a second output terminal, and (ii) a second output transistor having a fourth gate connected to the second output terminal, a fourth source, and a fourth drain connected between the second node and the first output terminal;
• a first bias unit connected between the first and second connection nodes and the first and second output terminals, configured to control a first voltage drop between the first and second output terminals and the first and second connection nodes based on or in response to a first bias signal;
• a second bias unit connected between the first and second output transistors and the first and second output terminals, configured to control a second voltage drop between the first output transistor and the second output terminal and a third voltage drop between the second output transistor and the first output terminal based on or in response to a second bias signal;
• and
• a first switch configured to supply the first voltage to the first output terminal based on or in response to a control signal.