Gate driver and display apparatus having the same

Abstract

Each stage of a gate driver includes a controlling part which increases an electric potential of a boosting line in response to a carry signal of a previous stage and decreases the electric potential of the boosting line in response to the carry signal of a next stage, a first output part which turns on in response to the increased electric potential of the boosting line and receiving a clock signal to output a gate signal of a present stage, and a second output part which turns on in response to the increased electric potential of the boosting line and receiving the clock signal to output the carry signal of the present stage. The boosting line of the present stage is disposed adjacent to a gate line which is connected to one of next stages following the present stage.

What is claimed is: 
     
         1 . A gate driver comprising:
 a plurality of stages connected to each other one after another and connected to gate lines to output gate signals, each of the stages comprises:
 a controlling part which increases an electric potential of a boosting line in response to a carry signal of a previous stage and decreases the electric potential of the boosting line in response to the carry signal of a next stage; 
 a first output part which turns on in response to the increased electric potential of the boosting line and receives a clock signal to output the gate signal of a present stage; and 
 a second output part which turns on in response to the increased electric potential of the boosting line and receives the clock signal to output the carry signal of the present stage, wherein the boosting line of the present stage is disposed adjacent to the gate line connected to one of next stages following the present stage. 
   
     
     
         2 . The gate driver of  claim 1 , wherein the controlling part of a first stage of the plurality of stages is applied with a start signal to increase the electric potential of the boosting line. 
     
     
         3 . The gate driver of  claim 1 , wherein the boosting line of the present stage is disposed adjacent to the gate line which is connected to the next stage. 
     
     
         4 . The gate driver of  claim 1 , further comprising a plurality of carry lines disposed to correspond to the gate lines in a one-to-one correspondence to output the carry signal from one stage to the next stage. 
     
     
         5 . The gate driver of  claim 4 , wherein the carry lines are substantially extended in parallel to the gate lines. 
     
     
         6 . The gate driver of  claim 4 , wherein the boosting line of the present stage is disposed between the gate line, which is connected to the next stage, and the carry line of the next stage. 
     
     
         7 . The gate driver of  claim 4 , wherein the boosting line of the present stage is disposed under the carry line of the next stage. 
     
     
         8 . The gate driver of  claim 1 , wherein each of the stages further comprises:
 a first pull-down part which decreases an electric potential of an output terminal of the each stage, wherein the output terminal outputs the gate signal of the present stage to a first voltage in response to the gate signal of the next stage;   a second pull-down part which decreases an electric potential of a carry terminal of the each stage, wherein the carry terminal outputs the carry signal of the present stage to a second voltage, which is lower than the first voltage, in response to the gate signal of the next stage;   a holding part which holds the gate signal of the present stage to the first voltage and holds the carry signal of the present stage to the second voltage during a turn-off period of the first output part;   a switching part which controls an on/off operation of the holding part; and   a stabilizing part which stabilizes the electric potential of the boosting line during a low period of the gate signal of the present stage.   
     
     
         9 . The gate driver of  claim 8 , wherein the plurality of stages is further connected to a plurality of lines which receives the first voltage, the second voltage, and the clock signal, wherein the plurality of lines extends in a direction which crosses a direction in which the gate lines extend. 
     
     
         10 . A display apparatus comprising:
 a display panel comprising a display area, in which pixels are disposed and connected to gate lines and data lines, wherein the data lines cross the gate lines, and a non-display area surrounding the display area; and   a gate driver comprising a plurality of stages connected to each other one after another, connected to the gate lines to output gate signals, and disposed on the display area, wherein each of the stages comprises:
 a controlling part which increases an electric potential of a boosting line in response to a carry signal of a previous stage and decreases the electric potential of the boosting line in response to the carry signal of a next stage; 
 a first output part which turns on in response to the increased electric potential of the boosting line and receives a clock signal to output the gate signal of a present stage; and 
 a second output part which turns on in response to the increased electric potential of the boosting line and receives the clock signal to output the carry signal of the present stage, wherein the boosting line of the present stage is disposed adjacent to the gate line connected to one of next stages following the present stage, and the controlling part of a first stage of the plurality of stages is applied with a start signal to increase the electric potential of the boosting line. 
   
     
     
         11 . The display apparatus of  claim 10 , wherein the boosting line of the present stage is disposed adjacent to the gate line, which is connected to the next stage. 
     
     
         12 . The display apparatus of  claim 10 , further comprising a plurality of carry lines disposed to correspond to the gate lines in a one-to-one correspondence to output the carry signal from one stage to the next stage. 
     
     
         13 . The display apparatus of  claim 12 , wherein the carry lines are substantially extended in parallel to the gate lines. 
     
     
         14 . The display apparatus of  claim 12 , wherein the boosting line of the present stage is disposed between the gate line, which is connected to the next stage, and a carry line of the next stage. 
     
     
         15 . The display apparatus of  claim 12 , wherein the boosting line of the present stage is disposed under the carry line of the next stage. 
     
     
         16 . The display apparatus of  claim 10 , wherein each of the stages further comprises:
 a first pull-down part which decreases an electric potential of an output terminal of each stage, wherein the output terminal outputs the gate signal of the present stage to a first voltage in response to the gate signal of the next stage;   a second pull-down part which decreases an electric potential of a carry terminal of each stage, wherein the carry terminal outputs the carry signal of the present stage to a second voltage, which is lower than the first voltage, in response to the gate signal of the next stage;   a holding part which holds the gate signal of the present stage to the first voltage and holds the carry signal of the present stage to the second voltage during a turn-off period of the first output part;   a switching part which controls an on/off operation of the holding part; and   a stabilizing part which stabilizes the electric potential of the boosting line during a low period of the gate signal of the present stage.   
     
     
         17 . The display apparatus of  claim 16 , wherein the first output part, the second output part, the controlling part, the first pull-down part, the second pull-down part, the holding part, the switching part, and the stabilizing part of each stage are disposed between pixels arranged in a corresponding row among a plurality of rows. 
     
     
         18 . The display apparatus of  claim 16 , wherein the plurality of stages of the gate driver is further connected to a plurality of lines which receives the first voltage, the second voltage, and the clock signal, wherein the plurality of lines extends in a direction which crosses a direction in which the gate lines extend. 
     
     
         19 . The display apparatus of  claim 10 , wherein the stages are disposed in a predetermined area of one side of the display area.