Display devices

Patent metadata

Field	Value
Publication number	US-10679560-B2
Application number	US-201816051629-A
Country	US
Kind code	B2
Filing date	Aug 1, 2018
Priority date	Sep 1, 2017
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A display device includes a pixel array, multiple data lines, and multiple gate lines. The pixel array includes multiple pixel units. The data lines are coupled to the pixel array. The gate lines are coupled to the pixel array. One of the pixel units includes a switch circuit, a display unit, and a first voltage level shifting circuit. The switch circuit is coupled to one of the data lines and one of the gate lines. The first voltage level shifting circuit is coupled between the switch circuit and the display unit and configured to adjust the voltage level of a data driving signal provided by the data line to the display unit.

First claim

What is claimed is:

1. A display device, comprising:
a pixel array, comprising a plurality of pixel units;
a plurality of data lines, coupled to the pixel array; and
a plurality of gate lines, coupled to the pixel array,
wherein one of the pixel units comprises:
a switch circuit, coupled to one of the plurality of data lines and one of the plurality of gate lines;
a display unit; and
a first voltage level shifting circuit, coupled between the switch circuit and the display unit, and the first voltage level shifting circuit being configured to adjust a voltage level of a data driving signal provided by the one of the plurality of data lines to the display unit.

2. The display device as claimed in claim 1 , wherein the voltage level of the data driving signal comprises a first voltage level and a second voltage level, the first voltage level is higher than the second voltage level, the first voltage level shifting circuit pulls the voltage level of the data driving signal up from the first voltage level to a target high voltage level, or pulls the voltage level of the data driving signal down from the second voltage level to a target low voltage level.

3. The display device as claimed in claim 2 , wherein an absolute value of the target high voltage level or the target low voltage level is greater than 10 volts and less than 20 volts.

4. The display device as claimed in claim 1 , further comprising:
a data driving circuit, coupled to the plurality of data lines; and
a second voltage level shifting circuit, coupled between the data driving circuit and the pixel unit, and the second voltage level shifting circuit being configured to adjust a voltage level of the data driving signal.

5. The display device as claimed in claim 1 , further comprising:
a post charge driving circuit, coupled to the pixel array and configured to output a selection signal; and
a plurality of post charge switch circuits, wherein each post charge switch circuit is coupled to one of the plurality of data lines, and wherein the post charge switch circuits receive the selection signal and change the on-off status thereof in response to the selection signal.

6. The display device as claimed in claim 5 , further comprising:
a gate driving circuit, coupled to the plurality of gate lines, wherein during a pixel electrode maintenance period, the gate driving circuit is configured to receive the selection signal and generate a plurality of control pulses on the plurality of gate lines in response to the selection signal.

7. The display device as claimed in claim 6 , wherein one of the post charge switch circuits comprises:
a first terminal, configured to receive a predetermined voltage;
a second terminal, coupled to the one of the plurality of data lines; and
a control terminal, configured to receive the selection signal,
wherein during the pixel electrode maintenance period, the post charge switch circuit is turned on in response to the selection signal, and provides the predetermined voltage to the one of the plurality of data lines as the data driving signal.

8. The display device as claimed in claim 7 , wherein the first voltage level shifting circuit is configured to receive a target voltage and adjust the voltage level of the data driving signal provided to the display unit according to the target voltage, and the display unit is configured to receive a common voltage, and wherein during the pixel electrode maintenance period, the target voltage is set to the same voltage level as the common voltage.

9. The display device as claimed in claim 6 , wherein during a data writing period, the gate driving circuit is configured to sequentially generate a corresponding gate pulse on each of the plurality of gate lines, and wherein the plurality of data lines are configured to provide the data driving signal to the display unit in the pixel array, and after the data writing period has ended, the pixel electrode maintenance period is entered.

10. A display device, comprising:
a pixel array, comprising a plurality of pixel units;
a plurality of data lines, coupled to the pixel array; and
a plurality of gate lines, coupled to the pixel array,
wherein one of the pixel units comprises:
a switch circuit, coupled to one of the plurality of data lines and one of the plurality of gate lines;
a display unit; and
a first voltage level shifting circuit, coupled between the switch circuit and the display unit, and the first voltage level shifting circuit being configured to adjust a voltage level of a data driving signal provided by the one of the plurality of data lines to the display unit,
wherein an absolute value of a level of a driving voltage required by the display unit is higher than a predetermined voltage level.

11. The display device as claimed in claim 10 , wherein the voltage level of the data driving signal comprises a first voltage level and a second voltage level, the first voltage level is higher than the second voltage level, the first voltage level shifting circuit pulls the voltage level of the data driving signal up from the first voltage level to a target high voltage level, or pulls the voltage level of the data driving signal down from the second voltage level to a target low voltage level.

12. The display device as claimed in claim 11 , wherein an absolute value of the target high voltage level or the target low voltage level is greater than 10 volts and less than 20 volts.

13. The display device as claimed in claim 10 , further comprising:
a data driving circuit, coupled to the plurality of data lines; and
a second voltage level shifting circuit, coupled between the data driving circuit and the pixel unit, and the second voltage level shifting circuit being configured to adjust a voltage level of the data driving signal.

14. The display device as claimed in claim 10 , further comprising:
a post charge driving circuit, coupled to the pixel array and configured to output a selection signal; and
a plurality of post charge switch circuits, wherein each post charge switch circuit is coupled to one of the plurality of data lines, and wherein the post charge switch circuits receive the selection signal and change the on-off status thereof in response to the selection signal.

15. The display device as claimed in claim 14 , further comprising:
a gate driving circuit, coupled to the plurality of gate lines, wherein during a pixel electrode maintenance period, the gate driving circuit is configured to receive the selection signal and generate a plurality of control pulses on the plurality of gate lines in response to the selection signal.

16. The display device as claimed in claim 15 , wherein one of the post charge switch circuits comprises:
a first terminal, configured to receive a predetermined voltage;
a second terminal, coupled to the one of the plurality of data lines; and
a control terminal, configured to receive the selection signal,
wherein during the pixel electrode maintenance period, the post charge switch circuit is turned on in response to the selection signal, and provides the predetermined voltage to the one of the plurality of the data lines as the data driving signal.

17. The display device as claimed in claim 16 , wherein the first voltage level shifting circuit is configured to receive a target voltage and adjust the voltage level of the data driving signal provided to the display unit according to the target voltage, and the display unit is configured to receive a common voltage, and wherein during the pixel electrode maintenance period, the target vo

Assignees

• Innolux Corp

Inventors

• Huang Sheng-Feng
• Pan cheng-shen
• Wu Cheng-Min
• Sung Li-Wei

Classifications

• G09G3/3677 Primary

  suitable for active matrices only · CPC title

• G09G2310/0289

  Details of voltage level shifters arranged for use in a driving circuit · CPC title

• H01L51/5203

  Electricity · mapped topic

• G09G2310/0267

  Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title