Gate driving circuit and display apparatus including the same

Patent metadata

Field	Value
Publication number	US-10810965-B2
Application number	US-201715798925-A
Country	US
Kind code	B2
Filing date	Oct 31, 2017
Priority date	Dec 22, 2016
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

A gate driving circuit includes a pull-up control part applying a previous carry signal of one of previous stages to a first node in response to the previous carry signal, a pull-up part outputting a clock signal as an N-th gate output signal in response to a signal at the first node, a carry part outputting the clock signal as an N-th carry signal in response to the signal at the first node, a first pull-down part pulling down the signal at the first node to a second off voltage in response to a first next carry signal of one of next stages and a second pull-down part pulling down the N-th gate output signal to a first off voltage in response to a second next carry signal of one of the next stages different from the first next carry signal.

First claim

What is claimed is:

1. A gate driving circuit comprising:
stages which respectively output carry signals and gate output signals, an N-th stage of the stages comprising:
a pull-up control part which applies a previous carry signal of the carry signals of one of previous stages of the stages to a first node in response to the previous carry signal;
a pull-up part which outputs a clock signal as an N-th gate output signal in response to a signal at the first node;
a carry part which is directly connected to an output node which outputs the clock signal as an N-th carry signal in response to the signal at the first node;
a first pull-down part which pulls down the signal at the first node to a second off voltage in response to a first next carry signal of one of next stages;
a second pull-down part which pulls down the N-th gate output signal to a first off voltage in response to a second next carry signal of one of the next stages different from the first next carry signal, and
a carry pull down part which is directly connected to the output node and pulls down the N-th carry signal to the second off voltage in response to the second next carry signal,

wherein N is a positive integer.

2. The gate driving circuit of claim 1 , wherein the first next carry signal has a timing later than a timing of the second next carry signal.

3. The gate driving circuit of claim 2 , wherein the gate driving circuit further comprises:
a first next stage disposed at a first next stage position from the N-th stage;
a second next stage disposed at a second next stage position from the N-th stage; and
a third next stage position disposed at a third next stage position from the N-th stage,
the first next carry signal is a carry signal of the third next stage, and
the second next carry signal is a carry signal of the second next stage.

4. The gate driving circuit of claim 3 , wherein a first clock signal is applied to the N-th stage,
a second clock signal different from the first clock signal is applied to the first next stage,
a third clock signal different from the first clock signal and the second clock signal is applied to the second next stage, and
a fourth clock signal different from the first clock signal, the second clock signal and the third clock signal is applied to the third next stage.

5. The gate driving circuit of claim 4 , wherein the third clock signal is an inverted signal of the first clock signal, and
the fourth clock signal is an inverted signal of the second clock signal.

6. The gate driving circuit of claim 1 , further comprising an inverting part which generates an inverting signal based on the clock signal and the second off voltage and output the inverting signal to an inverting node.

7. The gate driving circuit of claim 6 , wherein the inverting part includes:
a first inverting transistor;
a second inverting transistor;
a third inverting transistor; and
a fourth inverting transistor,
the first inverting transistor and the third inverting transistor are connected to each other in series,
the second inverting transistor and the fourth inverting transistor are connected to each other in series,
the first inverting transistor includes a control electrode and an input electrode to which the clock signal is commonly applied and an output electrode connected to a third node,
the second inverting transistor includes a control electrode connected to the third node, an input electrode to which the clock signal is applied and an output electrode connected to the inverting node,
the third inverting transistor includes a control electrode connected to a carry terminal from which the N-th carry signal is outputted, an input electrode to which the second off voltage is applied and an output electrode connected to the third node, and
the fourth inverting transistor includes a control electrode connected to the carry terminal, an input electrode to which the second off voltage is applied and the output electrode connected to the inverting node.

8. The gate driving circuit of claim 6 , further comprising a first holding part which pulls down the signal at the first node to the second off voltage in response to the inverting signal at the inverting node.

9. The gate driving circuit of claim 8 , further comprising a second holding part which pulls down the N-th gate output signal to the first off voltage in response to the inverting signal at the inverting node.

10. The gate driving circuit of claim 9 , further comprising a third holding part which pulls down the N-th carry signal to the second off voltage in response to the inverting signal at the inverting node.

11. The gate driving circuit of claim 1 , further comprising a fourth holding part which pulls down the signal at the first node to the second off voltage in response to a third next carry signal of one of the next stages different from the first next carry signal and the second next carry signal.

12. The gate driving circuit of claim 1 , further comprising:
a first reset part which pulls down the N-th gate output signal to the first off voltage in response to a reset signal;
a second reset part which pulls down the signal at the first node to the second off voltage in response to the reset signal; and
a third reset part which pulls down the N-th carry signal to the second off voltage in response to the reset signal.

13. The gate driving circuit of claim 1 , further comprising a carry pull down part which pulls down the N-th carry signal to the second off voltage in response to an inverted clock signal different from the clock signal.

14. The gate driving circuit of claim 13 , further comprising a fourth holding part which pulls down the signal at the first node to the second off voltage in response to a third next carry signal of one of the next stages different from the first next carry signal and the second next carry signal.

15. The gate driving circuit of claim 14 , further comprising a first holding part which applies the N-th carry signal to the first node in response to the clock signal.

16. The gate driving circuit of claim 15 , further comprising a second holding part which pulls down the N-th gate output part to the first off voltage in response to the inverted clock signal.

17. A display apparatus comprising:
a display panel which displays an image;
a data driving circuit which applies a data voltage to the display panel; and
a gate driving circuit which applies a gate output signal to the display panel,
the gate driving circuit comprising:
stages which respectively output carry signals and gate output signals, an N-th stage of the stages comprising:
a pull-up control part which applies a previous carry signal of one of previous stages to a first node in response to the previous carry signal;
a pull-up part which outputs a clock signal as an N-th gate output signal in response to a signal at the first node;
a carry part which is directly connected to an output node which outputs the clock signal as an N-th carry signal in response to the signal at the first node;
a first pull-down part which pulls down the signal at the first node to a second off voltage in response to a first next carry signal of one of next stages; and
a second pull-down part which pulls down the N-th gate output signal to a first off voltage in response to a second next carry signal of one of the next stages different from the first next carry signal; and
a carry pull down part which is directly connected to the output node and pulls down the N-th carry signal to the second off voltage in response to

Assignees

• Samsung Display Co Ltd

Inventors

• Seong Jaemin
• Jeon Youngjae
• Chae Mincheol
• Choi Jaeho

Classifications

• G09G2230/00

  Details of flat display driving waveforms · CPC title

• G09G3/3677 Primary

  suitable for active matrices only · CPC title

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · CPC title

• G09G3/3614

  Control of polarity reversal in general · CPC title

• G09G3/3688 Primary

  suitable for active matrices only · CPC title