Display panel and drive method thereof

• US 10,446,074 B2
• Filed: 11/25/2016
• Issued: 10/15/2019
• Est. Priority Date: 11/27/2015
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: InnoLux Corporation
• Inventors: Chen, Bo-Feng, Hsieh, Tsau-Hua
• Primary Examiner(s): Sadio, Insa
• Application Number:
  US15/361,237
• Publication Number:
  US 20170154581A1
• Time in Patent Office: Days
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2330/10 Dealing with defective pixels
• CPC Class Codes: G09G 3/2018 by time modulation using two or more time intervals
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]

Abstract

A display panel includes a plurality of gate lines, a plurality of source lines, a plurality of first transistors and a plurality of light emitting diodes. The control end of each of the first transistors receives a gate signal. The first end of each of the first transistors receives a source signal. The first end of each if the LEDs is electrically connected to the second end of one of the corresponding first transistors. The second end of each of the LEDs receives a drive signal. A frame time of the light emitting diodes includes a first cycle and a second cycle. Within the first cycle of the frame time, the level of the source signal is higher than the level of the drive signal. Within the second cycle of the frame time, the level of the source signal is lower than the level of the drive signal.

Claims

1. A display panel, comprising:

a plurality of gate lines;

a plurality of source lines;

a plurality of first transistors, wherein a control end of each of the first transistors is electrically connected to one of the gate lines and receives a gate signal, and a first end of each of the first transistors is electrically connected to one of the source lines and receives a source signal; and

a plurality of light emitting diodes (LEDs), wherein a first end of each of the LEDs is electrically connected to a second end of one of the corresponding first transistors, and a second end of each of the LEDs receives a drive signal;

wherein a frame time of the light emitting diodes comprises at least a first cycle and a second cycle;

in the first cycle of the frame time, a level of the source signal is higher than a level of the drive signal;

in the second cycle of the frame time, the level of the source signal is lower than the level of the drive signal; and

when a period of the first cycle is equivalent to a period of the second cycle, a level difference between the source signal and the drive signal in the first cycle is equivalent to a level difference between the source signal and the drive signal in the second cycle.

2. The display panel according to claim 1, wherein the LEDs comprise a first LED group and a second LED group, a first end of each of the first LED group is an anode end, a second end of the first LED group is a cathode end, a first end of the second LED group is a cathode end, and a second end of the second LED group is an anode end.

3. The display panel according to claim 1, wherein the drive signal is a direct current (DC) voltage signal, an alternating current (AC) voltage signal, a DC current signal or an AC current signal.

4. The display panel according to claim 1, wherein the level of the drive signal in the first cycle is different from the level of the drive signal in the second cycle.

5. The display panel according to claim 1, wherein the level of the source signal in the first cycle is different from the level of the source signal in the second cycle.

6. The display panel according to claim 1, wherein when a period of the first cycle is smaller than a period of the second cycle, a level difference between the source signal and the drive signal in the first cycle is larger than a level difference between the source signal and the drive signal in the second cycle.

7. The display panel according to claim 1, wherein the frame time of the light emitting diodes further comprises a third cycle, the level of the source signal is higher than the level of the drive signal in the third cycle.

8. The display panel according to claim 1, wherein the frame time of the light emitting diodes further comprises a third cycle the level of the source signal is lower than the level of the drive signal in the third cycle.

9. A drive method of a display panel, comprising:

providing a gate signal to a plurality of gate lines;

providing a source signal to a plurality of source lines; and

providing a drive signal to a plurality of second ends of a plurality of light emitting diodes (LEDs);

wherein a frame time of the light emitting diodes comprises at least a first cycle and a second cycle;

in the first cycle of the frame time, a level of the source signal is higher than a level of the drive signal;

in the second cycle of the frame time, the level of the source signal is lower than the level of the drive signal; and

when a period of the first cycle is equivalent to a period of the second cycle, a level difference between the source signal and the drive signal in the first cycle is equivalent to a level difference between the source signal and the drive signal in the second cycle.

10. The drive method according to claim 9, wherein the light emitting diodes comprise a first LED group and a second LED group, a first end of the first LED group is an anode end, a second end of the first LED group is a cathode end, a first end of the second LED group is a cathode end, and a second end of the second LED group is an anode end.

11. The drive method according to claim 9, wherein the drive signal is a DC voltage signal, a DC current signal, an AC voltage signal or an AC current signal.

12. The drive method according to claim 9, wherein the level of the drive signal in the first cycle is different from the level of the drive signal in the second cycle.

13. The drive method according to claim 9, wherein the level of the source signal in the first cycle is different from the level of the source signal in the second cycle.

14. The drive method according to claim 9, wherein when a period of the first cycle is smaller than a period of the second cycle, a level difference between the source signal and the drive signal in the first cycle is larger than a level difference between the source signal and the drive signal in the second cycle.

15. The drive method according to claim 9, wherein the frame time of the light emitting diodes further comprises a third cycle of the frame time, the level of the source signal is higher than the level of the drive signal in the third cycle.

16. The drive method according to claim 9, wherein the frame time of the light emitting diodes further comprises a third cycle of the frame time, the level of the source signal is lower than the level of the drive signal in the third cycle.

17. A display panel, comprising:

a plurality of gate lines;

a plurality of source lines;

a plurality of first transistors, wherein a control end of each of the first transistors is electrically connected to one of the gate lines and receives a gate signal, and a first end of each of the first transistors is electrically connected to one of the source lines and receives a source signal; and

a plurality of light emitting diodes (LEDs), wherein a first end of each of the LEDs is electrically connected to a second end of one of the corresponding first transistors, and a second end of each of the LEDs receives a drive signal;

wherein a frame time of the light emitting diodes comprises at least a first cycle and a second cycle;

in the first cycle of the frame time, a level of the source signal is higher than a level of the drive signal;

in the second cycle of the frame time, the level of the source signal is lower than the level of the drive signal; and

when a period of the first cycle is larger than a period of the second cycle, a level difference between the source signal and the drive signal in the first cycle is smaller than a level difference between the source signal and the drive signal in the second cycle.

18. A drive method of a display panel, comprising:

providing a gate signal to a plurality of gate lines;

providing a source signal to a plurality of source lines; and

providing a drive signal to a plurality of second ends of a plurality of light emitting diodes (LEDs);

wherein a frame time of the light emitting diodes comprises at least a first cycle and a second cycle;

in the first cycle of the frame time, a level of the source signal is higher than a level of the drive signal;

in the second cycle of the frame time, the level of the source signal is lower than the level of the drive signal; and

when a period of the first cycle is larger than a period of the second cycle, a level difference between the source signal and the drive signal in the first cycle is smaller than a level difference between the source signal and the drive signal in the second cycle.