Display panel and display device including the same

Patent metadata

Field	Value
Publication number	US-12236879-B2
Application number	US-202318545798-A
Country	US
Kind code	B2
Filing date	Dec 19, 2023
Priority date	Mar 16, 2023
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A display panel includes: first to N-th active pixels, N being an integer greater than 3; and a dummy pixel arranged adjacent to the N-th active pixel in a same pixel column, the dummy pixel including: a dummy driving transistor including a gate electrode connected to a first node, a first electrode connected to a data line configured to transmit a data voltage, and a second electrode connected to a second node; a plurality of dummy compensation transistors connected in parallel to each other between the first node and the second node; a dummy initialization transistor including a gate electrode configured to receive an initialization gate signal, a first electrode configured to receive an initialization voltage, and a second electrode connected to the first node; and a dummy storage capacitor including a first electrode configured to receive a first supply voltage and a second electrode connected to the first node.

First claim

What is claimed is:

1. A display panel comprising:
a plurality of active pixels comprising a first active pixel to an N-th active pixel, N being a natural number of 4 or more; and
a dummy pixel arranged adjacent to the N-th active pixel in a same pixel column, the dummy pixel comprising:
a dummy driving transistor comprising a gate electrode connected to a first node, a first electrode connected to a data line configured to transmit a data voltage, and a second electrode connected to a second node;
a plurality of dummy compensation transistors connected in parallel to each other between the first node and the second node;
a dummy initialization transistor comprising a gate electrode configured to receive an initialization gate signal, a first electrode configured to receive an initialization voltage, and a second electrode connected to the first node; and
a dummy storage capacitor comprising a first electrode configured to receive a first supply voltage and a second electrode connected to the first node.

2. The display panel of claim 1 , wherein the dummy compensation transistors comprise:
a dummy first compensation transistor comprising a gate electrode configured to receive a write gate signal having two active pulses, a first electrode connected to the second node, and a second electrode connected to the first node; and
a dummy second compensation transistor comprising a gate electrode configured to receive a first later write gate signal applied after the write gate signal, a first electrode connected to the second node, and a second electrode connected to the first node.

3. The display panel of claim 2 , wherein an N−1-th active pixel of the plurality of active pixels is configured to receive the data voltage when the dummy pixel receives the data voltage, the dummy first compensation transistor is turned on, and the dummy second compensation transistor is turned off.

4. The display panel of claim 2 , wherein the N-th active pixel is configured to receive the data voltage when the dummy pixel receives the data voltage, the dummy second compensation transistor is turned on, and the dummy first compensation transistor is turned off.

5. The display panel of claim 2 , wherein active pulses of the write gate signal do not overlap active pulses of the first later write gate signal.

6. The display panel of claim 2 , wherein the dummy first compensation transistor and the dummy second compensation transistor are alternately turned on.

7. The display panel of claim 2 , wherein active pulses of the initialization gate signal do not overlap active pulses of the write gate signal and active pulses of the first later write gate signal.

8. The display panel of claim 1 , further comprising:
a dummy write transistor configured to connect the data line to the first electrode of the dummy driving transistor,
wherein the dummy write transistor is turned on at all times.

9. The display panel of claim 1 , wherein the dummy compensation transistors comprise:
a dummy first compensation transistor comprising a gate electrode configured to receive a write gate signal having three active pulses, a first electrode connected to the second node, and a second electrode connected to the first node;
a dummy second compensation transistor comprising a gate electrode configured to receive a first later write gate signal applied after the write gate signal, a first electrode connected to the second node, and a second electrode connected to the first node;
a dummy third compensation transistor comprising a gate electrode configured to receive a second later write gate signal applied after the first later write gate signal, a first electrode connected to the second node, and a second electrode connected to the first node; and
a dummy fourth compensation transistor comprising a gate electrode configured to receive a third later write gate signal applied after the second later write gate signal, a first electrode connected to the second node, and a second electrode connected to the first node.

10. The display panel of claim 9 , wherein an N−1-th active pixel and an N−3-th active pixel of the plurality of active pixels are configured to receive the data voltage when the dummy pixel receives the data voltage, the dummy first compensation transistor is turned on, and the dummy second compensation transistor, the dummy third compensation transistor, and the dummy fourth compensation transistor are turned off.

11. The display panel of claim 9 , wherein the N-th active pixel and an N−2-th active pixel of the plurality of active pixels are configured to receive the data voltage when the dummy pixel receives the data voltage, the dummy second compensation transistor is turned on, and the dummy first compensation transistor, the dummy third compensation transistor, and the dummy fourth compensation transistor are turned off.

12. The display panel of claim 9 , wherein an N−1-th active pixel of the plurality of active pixels is configured to receive the data voltage when the dummy pixel receives the data voltage, the dummy first compensation transistor and the dummy third compensation transistor are turned on, and the dummy second compensation transistor and the dummy fourth compensation transistor are turned off.

13. The display panel of claim 9 , wherein the N-th active pixel is configured to receive the data voltage when the dummy pixel receives the data voltage, the dummy second compensation transistor and the dummy fourth compensation transistor are turned on, and the dummy first compensation transistor and the dummy third compensation transistor are turned off.

14. The display panel of claim 9 , wherein active pulses of the first later write gate signal do not overlap active pulses of the write gate signal and active pulses of the second later write gate signal.

15. The display panel of claim 9 , wherein the dummy first compensation transistor, the dummy second compensation transistor, the dummy third compensation transistor, and the dummy fourth compensation transistor are alternately turned on.

16. The display panel of claim 9 , wherein active pulses of the initialization gate signal do not overlap active pulses of the write gate signal, active pulses of the first later write gate signal, and active pulses of the second later write gate signal.

17. The display panel of claim 9 , further comprising:
a dummy write transistor configured to connect the data line to the first electrode of the dummy driving transistor,
wherein the dummy write transistor is turned on at all times.

18. The display panel of claim 1 , wherein the dummy compensation transistors have a dual gate structure comprising two gate electrodes, and
wherein the dummy initialization transistor has a dual gate structure comprising two gate electrodes.

19. A display device comprising:
a display panel comprising a plurality of active pixels comprising a first active pixel to an N-th active pixel and a dummy pixel arranged adjacent to the N-th active pixel in a same pixel column, N being a natural number of 4 or more; and
a display panel driver configured to drive the display panel,
wherein the dummy pixel comprises:
a dummy driving transistor comprising a gate electrode connected to a first node, a first electrode connected to a data line configured to transmit a data voltage, and a second electrode connected to a second node;
a plurality of dummy compensation transistors connected in parallel to each other between the first node and the second node;
a dummy initialization transistor comprisi

Assignees

• Samsung Display Co Ltd

Inventors

• Keum Nackhyeon
• Lee Kwangsae

Classifications

• H10K59/88

  Dummy elements, i.e. elements having non-functional features · CPC title

• G09G2300/0413

  Details of dummy pixels or dummy lines in flat panels · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G2330/021

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