Data driver, display device including the same, and method for driving display device

Patent metadata

Field	Value
Publication number	US-12380863-B2
Application number	US-202418609648-A
Country	US
Kind code	B2
Filing date	Mar 19, 2024
Priority date	Aug 1, 2023
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A display device includes a display panel including a plurality of pixels and a plurality of data lines connected to the pixels, and a data driver which provide a plurality of data voltages to the data lines. The data driver includes a plurality of channels, where each of the channels outputs an n th data voltage in an n th horizontal period, and outputs an (n+1) th data voltage in an (n+1) th horizontal period, where n is a natural number, a common line, a plurality of data switches, which selectively connect the channels to the data lines, respectively, a plurality of common switches, each of which selectively connects a corresponding one of the channels to the common line, and a voltage sensor which senses a common voltage of the common line.

First claim

What is claimed is:

1. A display device comprising: a display panel including a plurality of pixels, and a plurality of data lines connected to the pixels; and a data driver which provides a plurality of data voltages to the data lines, wherein the data driver includes: a plurality of channels, wherein each of the channels outputs an n.sup.th data voltage in an n.sup.th horizontal period, and outputs an (n+1).sup.th data voltage in an (n+1).sup.th horizontal period, wherein n is a natural number; a common line; a plurality of data switches which selectively connects the channels to the data lines, respectively; a plurality of common switches, wherein each of the common switches selectively connects a corresponding one of the channels to the common line; and a voltage sensor which senses a common voltage of the common line; wherein the data driver further includes a voltage comparator which compares the common voltage, the n.sup.th data voltage, and the (n+1).sup.th data voltage with each other; wherein a channel among the channels is connected to the common line by a common switch corresponding thereto among the common switches when the common voltage is between the n.sup.th data voltage of the channel and the (n+1).sup.th data voltage of the channel.

2. The display device of claim 1 , wherein the data driver further includes a capacitor connected between the common line and a ground.

3. The display device of claim 1 , wherein the data driver further includes:
a plurality of capacitors connected to a ground; and
a plurality of capacitor switches, wherein each of the capacitor switches selectively connects a corresponding one of the capacitors to the common line.

4. The display device of claim 3 , wherein capacitances of the capacitors are equal to each other.

5. The display device of claim 3 , wherein capacitances of the capacitors are different from each other.

6. The display device of claim 3 , wherein the common voltage is increased or decreased by selective operations of the capacitor switches.

7. The display device of claim 1 , wherein, when the common voltage is less than a minimum reference voltage, the common voltage is increased.

8. The display device of claim 1 , wherein, when the common voltage is greater than a maximum reference voltage, the common voltage is decreased.

9. The display device of claim 1 , wherein
each of the data lines extends in a first direction, and
the common line extends in a second direction intersecting the first direction.

10. The display device of claim 1 , further comprising:
a scan driver which provides a plurality of scan signals to the pixels; and
a controller which controls the data driver and the scan driver.

11. A data driver which provides a plurality of data voltages to a plurality of data lines, respectively, the data driver comprising:
a plurality of channels, wherein each of the channels outputs an n.sup.th data voltage in an n.sup.th horizontal period, and outputs an (n+1).sup.th data voltage in an (n+1).sup.th horizontal period, wherein n is a natural number; a common line;
a plurality of data switches which selectively connects the channels to the data lines, respectively; a plurality of common switches, wherein each of the common switches selectively connects a corresponding one of the channels to the common line;
a voltage sensor which senses a common voltage of the common line; and
a voltage comparator which compares the common voltage, the n.sup.th data voltage, and the (n+1).sup.th data voltage with each other; wherein a channel among the channels is connected to the common line by a common switch corresponding thereto among the common switches when the common voltage is between the n.sup.th data voltage of the channel and the (n+1).sup.th data voltage of the channel.

12. The data driver of claim 11 , further comprising:
a plurality of capacitors connected to a ground; and
a plurality of capacitor switches, wherein each of the capacitor switches selectively connects a corresponding one of the capacitors to the common line.

13. A method for driving a display device, the method comprising:
outputting an n th data voltage from a channel to a data line, wherein n is a natural number;
latching an (n+1) th data voltage to the channel;
sensing a common voltage of a common line;
comparing the common voltage, the n th data voltage, and the (n+1) th data voltage with each other;
connecting the channel to the common line when the common voltage is between the n th data voltage and the (n+1) th data voltage; and
outputting the (n+1) th data voltage from the channel to the data line.

14. The method of claim 13 , further comprising:
increasing or decreasing the common voltage after the connecting the channel to the common line and before the outputting the (n+1) th data voltage.

15. The method of claim 14 , wherein, the increasing or decreasing the common voltage comprises increasing the common voltage when the common voltage is less than a minimum reference voltage.

16. The method of claim 14 , wherein, in the increasing or decreasing the common voltage comprises decreasing the common voltage when the common voltage is greater than a maximum reference voltage.

Assignees

• Samsung Display Co Ltd

Inventors

• Im Taegon
• Bae Youngmin
• Jeon Jinyoung

Classifications

• G09G2330/021

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

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title

• G09G3/3688

  suitable for active matrices only · CPC title