Gate driver and display device including the same

A gate driver comprising a plurality of signal transmission units cascade-connected via a carry line to which a carry signal is for being applied from a prior signal transmission unit,

• wherein an nth (n is a positive integer) signal transmission unit includes:
• a circuit unit configured to receive the carry signal from the prior signal transmission unit to charge or discharge voltages of a first control node and a second control node;
• and
• an output unit configured to output a gate signal and a carry signal based on potentials of the first control node and the second control node,
• wherein the output unit includes:
• a first pull-up transistor having a first electrode connected to a first high potential voltage line, a gate electrode connected to the first control node, and a second electrode connected to a first output node;
• a first pull-down transistor having a first electrode connected to the first output node, a gate electrode connected to the second control node, a back gate electrode for receiving a carry signal from a previous signal transmission unit, and a second electrode connected to a first low potential voltage line;
• a second pull-up transistor having a first electrode connected to a second high potential voltage line, a gate electrode connected to the first control node, and a second electrode connected to a second output node;
• and
• a second pull-down transistor having a first electrode connected to the second output node, a gate electrode connected to the second control node, a back gate electrode for receiving the carry signal from the previous signal transmission unit, and a second electrode connected to a second low potential voltage line, and
• wherein the first and second pull-down transistors are configured to receive a carry signal of a gate low voltage from the previous signal transmission unit to the respective back gate electrode while being turned off as the second control node is discharged.

A display device comprising:

• a display panel on which a plurality of data lines, a plurality of gate lines crossing the data lines, a plurality of power lines to which different constant voltages are for being applied, and a plurality of sub-pixels are disposed;
• a data driver configured to supply a data voltage of pixel data to the data lines;
• and
• a gate driver configured to supply a gate signal to the gate lines,
• wherein the gate driver includes a plurality of signal transmission units cascade-connected via a carry line to which a carry signal is for being applied from a previous signal transmission unit,
• wherein an nth (n is a positive integer) signal transmission unit includes:
• a first circuit unit including a first Q logic generator configured to receive the carry signal from the previous signal transmission unit to charge a first control node, and a second Q logic generator configured to discharge the first control node;
• a second circuit unit configured to discharge a second control node according to a voltage of the first control node;
• and
• an output unit configured to output a carry signal and a gate signal based on potentials of the first control node and the second control node,
• wherein the second Q logic generator includes:
• a second-1 transistor having a first electrode connected to the first control node, a gate electrode connected to the second control node, a back gate electrode for receiving a carry signal from a next signal transmission unit, and a second electrode connected to a buffer node;
• and
• a second-2 transistor having a first electrode connected to the buffer node, a gate electrode connected to the second control node, a back gate electrode for receiving the carry signal from the next signal transmission unit, and a second electrode connected to a low potential voltage line, and
• wherein the second-1 and second-2 transistors are configured to receive a carry signal of a gate low voltage from the next signal transmission unit to the respective back gate electrode while being turned off as the second control node is discharged.

A display device comprising:

• a display panel on which a plurality of data lines, a plurality of gate lines crossing the data lines, a plurality of power lines to which different constant voltages are for being applied, and a plurality of sub-pixels are disposed;
• a data driver configured to supply a data voltage of pixel data to the data lines;
• and
• a gate driver configured to supply a gate signal to the gate lines,
• wherein the gate driver includes a plurality of signal transmission units cascade-connected via a carry line to which a carry signal is for being applied from a prior signal transmission unit,
• wherein an nth (n is a positive integer) signal transmission unit includes:
• a circuit unit configured to receive the carry signal from the prior signal transmission unit to charge or discharge voltages of a first control node and a second control node;
• and
• an output unit configured to output a gate signal and a carry signal based on potentials of the first control node and the second control node,
• wherein the output unit includes:
• a first pull-up transistor having a first electrode connected to a first high potential voltage line, a gate electrode connected to the first control node, and a second electrode connected to a first output node;
• a first pull-down transistor having a first electrode connected to the first output node, a gate electrode connected to the second control node, a back gate electrode for receiving a carry signal from a previous signal transmission unit, and a second electrode connected to a first low potential voltage line;
• a second pull-up transistor having a first electrode connected to a second high potential voltage line, a gate electrode connected to the first control node, and a second electrode connected to a second output node;
• and
• a second pull-down transistor having a first electrode connected to the second output node, a gate electrode connected to the second control node, a back gate electrode for receiving the carry signal from the previous signal transmission unit, and a second electrode connected to a second low potential voltage line, and
• wherein the first and second pull-down transistors are configured to receive a carry signal of a gate low voltage from the previous signal transmission unit to the respective back gate electrode while being turned off as the second control node is discharged.