Source driver and a display driver integrated circuit

Patent metadata

Field	Value
Publication number	US-10770022-B2
Application number	US-201916288166-A
Country	US
Kind code	B2
Filing date	Feb 28, 2019
Priority date	May 4, 2018
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

A source driver including: a first source line; a second source line; a charge sharing switch which controls a connection between the first source line and the second source line; a first cross charge sharing switch which controls a connection between a first capacitor and the first source line, and a connection between a second capacitor and the second source line; and a second cross charge sharing switch which controls a connection between the first capacitor and the second source line, and a connection between the second capacitor and the first source line.

First claim

What is claimed is:

1. A source driver, comprising:
a first source line connected to a first terminal;
a second source line connected to a second terminal;
a charge sharing switch which controls a connection between the first source line and the second source line;
a first cross charge sharing switch which controls a connection between a first capacitor and the first source line, and a connection between a second capacitor and the second source line, wherein a first cross charge sharing line is connected to a first end of the first cross charge sharing switch, a second end of the first cross charge sharing switch is connected to the first source line, and the first capacitor is connected to the first cross charge sharing line though a third terminal; and
a second cross charge sharing switch which controls a connection between the first capacitor and the second source line, and a connection between the second capacitor and the first source line.

2. The source driver of claim 1 , wherein, while the first cross charge sharing switch is turned on, the charge sharing switch and the second cross charge sharing switch are turned off, and
while the second cross charge sharing switch is turned on, the charge sharing switch and the first cross charge sharing switch, are turned off.

3. The source driver of claim 2 , wherein, when the first cross charge sharing switch is turned on,
a part of a charge of the first source line is provided to the first capacitor, and
a charge stored in the second capacitor is provided to the second source line.

4. The source driver of claim 2 , wherein, when the second cross charge sharing switch is turned on,
a charge stored in the first capacitor is provided to the second source line, and
a part of a charge of the first source line is provided to the second capacitor.

5. The source driver of claim 1 , wherein, while the charge sharing switch is turned on, the first cross charge sharing switch and the second cross charge sharing switch are turned off, and charges of the first source line and the second source line are shared with each other.

6. The source driver of claim 1 , further comprising:
an output switch which controls a connection between the first source line and a first buffer, and a connection between the second source line and a second buffer,
wherein, while the output switch is turned off,
one of the first cross charge sharing switch and the second cross charge sharing switch is first turned on,
the charge sharing switch is second turned on, and
the other one of the first cross charge sharing switch and the second cross charge sharing switch is third turned on.

7. The source driver of claim 6 , wherein a sequence of turning-on the first cross charge sharing switch and the second cross charge sharing switch depends on a polarity signal.

8. A display driver integrated circuit (IC), comprising:
a source driver which drives a data line of a display panel;
a gate driver which drives a gate line of the display panel; and
a controller which controls the source driver and the gate driver,
wherein the source driver includes a first capacitor, a second capacitor and a channel buffer, and
the channel buffer includes:
a first source line;
a second source line;
a charge sharing switch which controls a connection between the first source line and the second source line;
a first cross charge sharing switch which controls a connection between the first capacitor and the first source line, and a connection between the second capacitor and the second source line, wherein the first capacitor is connected to a first cross charge sharing line through a first terminal and the second capacitor is connected to a second cross charge sharing line through a second terminal; and
a second cross charge sharing switch which controls a connection between the first capacitor and the second source line, and a connection between the second capacitor and the first source line.

9. The display driver IC of claim 8 , wherein, while the first cross charge sharing switch is turned on, the charge sharing switch and the second cross charge sharing switch are turned off, and
while the second cross charge sharing switch is turned on, the charge sharing switch and the first cross charge sharing switch are turned off.

10. The display driver C of claim 9 , wherein, when the first cross charge sharing switch is turned on,
a part of a charge of the first source line is provided to the first capacitor, and
a charge stored in the second capacitor is provided to the second source line.

11. The display driver IC of claim 9 , wherein, when the second cross charge sharing switch is turned on,
a charge stored in the first capacitor is provided to the second source line, and
a part of a charge of the first source line is provided to the second capacitor.

12. The display driver IC of claim 8 , wherein the channel buffer includes a first buffer, a second buffer, and an output switch, the output switch controlling a connection between the first source line and the first buffer and a connection between the second source line and the second buffer,
wherein, while the output switch is turned off,
one of the first cross charge sharing switch and the second cross charge sharing switch is first turned on,
the charge sharing switch is second turned on, and
the other one of the first cross charge sharing switch and the second cross charge sharing switch is third turned on.

13. The display driver 1 C of claim 12 , wherein a sequence of turning-on the first cross charge sharing switch and the second cross charge sharing switch depends on a polarity signal.

14. A source driver, comprising:
a first source line connected to a first terminal, a second source line connected to a second terminal, a third source line connected to a third terminal and a fourth source line connected to a fourth terminal;
a plurality of charge sharing switches which control connections of the first source line, the second source line, the third source line and the fourth source line to each other;
a plurality of first cross charge sharing switches which control connections between a first capacitor, the first source line and the third source line, and connections bet wen a second capacitor, the second source line and the fourth source line, wherein the first capacitor is connected to a first cross charge sharing line through a fifth terminal and the second capacitor is connected to a second cross charge sharing line through a sixth terminal; and
a plurality of second cross charge sharing switches which control connections between the first capacitor, the second source line and the fourth source line, and connections between the second capacitor, the first source line and the third source line.

15. The source driver of claim 14 , wherein, while the plurality of first cross charge sharing switches are turned on, the plurality of charge sharing switches and the plurality of second cross, charge sharing switches are turned off, and
while the plurality of second cross charge sharing switches are turned on, the plurality of charge sharing switches and the plurality of first cross charge sharing switches are turned off.

16. The source driver of claim 15 , wherein, when the plurality of first cross charge sharing switches are turned on,
a part of a charge of the first source line and the third source line is provided to the first capacitor, and
a charge stored in the second capacitor is provided to the second source line and the fourth source line.

17. The source driver of claim 15 ,

Assignees

• Samsung Electronics Co Ltd

Inventors

• Chen Joway
• Choi Chul Ho
• Wu Dip
• Kim Hyeong Tae
• Chiou Yuwen
• Kim Jin Woo

Classifications

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G3/3688 Primary

  suitable for active matrices only · CPC title

• G09G3/3677 Primary

  suitable for active matrices only · CPC title

• G09G2320/041

  Temperature compensation · CPC title

• G09G3/3696

  Generation of voltages supplied to electrode drivers · CPC title