Display panel and display apparatus

Patent metadata

Field	Value
Publication number	US-12223905-B2
Application number	US-202418590365-A
Country	US
Kind code	B2
Filing date	Feb 28, 2024
Priority date	Mar 24, 2023
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

A display apparatus includes plural pixels, a scan driver, a data driver, and a read-out circuit that reads out an electrical characteristic of each of the pixels. Each of the pixels includes a first transistor, a second transistor, a third transistor, a fourth transistor including a first electrode connected with a power node, a second electrode connected with a first node, and a gate connected with a first emission control line, a fifth transistor including a first electrode connected with a third node, a second electrode, and a gate connected with a second emission control line, a sixth transistor including a first electrode connected with a read-out line, a second electrode connected with the third node, and a gate connected a the read-out/initialization control line, a capacitor connected between the first node and the second node, and an organic light-emitting diode.

First claim

What is claimed is:

1. A display apparatus comprising:
a plurality of pixels arranged in rows and columns;
a scan driver connected with the rows of pixels through a scan line, a first emission control line, a second emission control line, and a read-out/initialization control line;
a data driver connected with the columns of pixels through a data line; and
a read-out circuit connected with the columns of pixels through a read-out line and configured to read out an electrical characteristic of each of the plurality of pixels,
wherein each of the plurality of pixels comprises:
a first transistor including a first electrode connected with a first node, a second electrode connected with a third node, and a gate connected with a second node;
a second transistor including a first electrode connected with the data line, a second electrode connected with the first node, and a gate connected with the scan line;
a third transistor including a first electrode connected with the second node, a second electrode connected with the third node, and a gate connected with the scan line;
a fourth transistor including a first electrode connected with a power node to which a source voltage is supplied, a second electrode connected with the first node, and a gate connected with the first emission control line;
a fifth transistor including a first electrode, a second electrode, and a gate, the first electrode of the fifth transistor being connected with the third node and the gate of the fifth transistor being connected with the second emission control line;
a sixth transistor including a first electrode connected with the read-out line, a second electrode connected with the third node, and a gate connected with the read-out/initialization control line;
a capacitor connected between the first node and the second node; and
an organic light-emitting diode connected between the second electrode of the fifth transistor and a ground node to which a ground voltage is supplied.

2. The display apparatus of claim 1 , wherein the scan driver is configured to, in a reset period, output a scan signal having an active level through the scan line, output a first emission control signal having an inactive level through the first emission control line, output a second emission control signal having an inactive level through the second emission control line, and output a read-out/initialization control signal having an active level through the read-out/initialization control line.

3. The display apparatus of claim 1 , wherein the scan driver is configured to, in a program period, output a scan signal having an active level through the scan line, output a first emission control signal having an inactive level through the first emission control line, output a second emission control signal having an inactive level through the second emission control line, and output a read-out/initialization control signal having an inactive level through the read-out/initialization control line.

4. The display apparatus of claim 1 , wherein the scan driver is configured to, in a hold period, output a scan signal having an inactive level through the scan line, output a first emission control signal having an inactive level through the first emission control line, output a second emission control signal having an inactive level through the second emission control line, and output a read-out/initialization control signal having an inactive level through the read-out/initialization control line.

5. The display apparatus of claim 1 , wherein the scan driver is configured to, in an emission period, output a scan signal having an inactive level through the scan line, output a first emission control signal having an active level through the first emission control line, output a second emission control signal having an active level through the second emission control line, and output a read-out/initialization control signal having an inactive level through the read-out/initialization control line.

6. The display apparatus of claim 1 , wherein the scan driver is configured to, in a first read-out period, output a scan signal having an inactive level through the scan line, output a first emission control signal having an active level through the first emission control line, output a second emission control signal having an inactive level through the second emission control line, and output a read-out/initialization control signal having an active level through the read-out/initialization control line, and
the read-out circuit is configured to, in the first read-out period, generate data corresponding to a driving current, based on a signal received through the read-out line.

7. The display apparatus of claim 6 , wherein the scan driver is configured to, in a second read-out period, output the scan signal having an active level through the scan line, output the first emission control signal having an inactive level through the first emission control line, output the second emission control signal having an inactive level through the second emission control line, and output the read-out/initialization control signal having an active level through the read-out/initialization control line, and
the read-out circuit is configured to, in the second read-out period, generate data corresponding to a threshold voltage, based on the signal received through the read-out line.

8. The display apparatus of claim 7 , wherein the scan driver is configured to, in a third read-out period, output the scan signal having an inactive level through the scan line, output the first emission control signal having an active level through the first emission control line, output the second emission control signal having an active level through the second emission control line, and output the read-out/initialization control signal having an active level through the read-out/initialization control line, and
the read-out circuit is configured to, in the third read-out period, generate data corresponding to a forward voltage, based on the signal received through the read-out line.

9. The display apparatus of claim 1 , wherein brightness of the organic light-emitting diode is controlled by a voltage of the data line.

10. The display apparatus of claim 1 , wherein the scan driver is configured to, in an emission period, output a scan signal having an inactive level through the scan line, output a first emission control signal having an active level through the first emission control line, and output a read-out/initialization control signal having an inactive level through the read-out/initialization control line, and
the scan driver is configured to output a second emission control signal having an active level through the second emission control line in a first period of the emission period and output the second emission control signal having an inactive level through the second emission control line in a second period of the emission period.

11. The display apparatus of claim 1 , wherein a size of the second transistor is less than a size of the third transistor.

12. The display apparatus of claim 1 , wherein, in a reset period, a voltage of an initialization power source is applied to each of the plurality of pixels through the read-out line, and
in a first read-out period, a second read-out period, and a third read-out period, each of the plurality of pixels is configured to output a read-out signal through the read-out line.

13. The display apparatus of claim 1 , further comprising a first switch and a second switch,
wherein the first switch is connected between the read-out line and an initialization power node to which an initialization vol

Assignees

• Samsung Electronics Co Ltd

Inventors

• Song Uijong
• Kim Sunkwon
• Kim Hyungjoong
• Ryu Seongyoung
• Lee Yilho
• Lee Heejin

Classifications

• G09G2310/0278

  Details of driving circuits arranged to drive both scan and data electrodes · CPC title

• G09G2300/0814

  used for selection purposes, e.g. logical AND for partial update · CPC title

• G09G3/3275

  Details of drivers for data electrodes · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title