Granted Patent B2

US 12,731,543 · App. 18/972,421 · Granted Sep 8, 2026

Inventors: Ki Seob Shin (Paju-si, KR); Da Hye Shim (Paju-si, KR); Boo Heung Lee (Paju-si, KR)

Assignee: LG Display Co., Ltd.

G09G3/3233G09G2300/0819G09G2300/0852G09G2310/08G09G2320/0233G09G2320/068G09G2330/08G09G2380/10

Abstract

Claims (123)

1 . A pixel circuit, comprising:

a first light-emitting element;

a second light-emitting element;

a driving element configured to drive the first and second light-emitting elements;

a first switch element connected between the driving element and the first light-emitting element;

a second switch element connected between the driving element and the second light-emitting element; and

a compensation circuit, including:

a capacitor connected to a gate electrode of the driving element;

a third switch element directly connected between a voltage line to which a reference voltage is for being applied and one electrode of the capacitor;

a fourth switch element directly connected between a first node to which an anode electrode of the first light-emitting element is connected and an initialization voltage line to which an initialization voltage is for being applied;

a fifth switch element directly connected between a second node to which an anode electrode of the second light-emitting element is connected and the initialization voltage line; and

a switch element connected between a node of the driving element and a sixth node,

wherein:

the first switch element includes a first electrode connected to the sixth node, a second electrode connected to the first node, and a gate electrode to which a first gate signal is for being applied; and

the second switch element includes a first electrode connected to the sixth node, a second electrode connected to the second node, and a gate electrode to which the first gate signal is for being applied.

2 . The pixel circuit of claim 1 , wherein the initialization voltage is set to be lower than the reference voltage.

3 . The pixel circuit of claim 1 , wherein

a first repair capacitor is formed between the initialization voltage line and the first node, and

a second repair capacitor is formed between the initialization voltage line and the second node.

4 . The pixel circuit of claim 3 , wherein the driving element includes the gate electrode connected to a fourth node, a first electrode connected to a power line to which a pixel driving voltage is for being applied, and a second electrode connected to a fifth node,

the capacitor is connected between a third node and the fourth node, and

the third switch element is connected between the third node and the voltage line to which the reference voltage is for being applied, and

wherein the compensation circuit further includes:

a sixth switch element connected between the third node and a data line; and

a seventh switch element connected between the fourth node and the fifth node.

5 . The pixel circuit of claim 4 , wherein:

the fourth switch element includes a first electrode connected to the initialization voltage line, a gate electrode to which a second gate signal is for being applied, and a second electrode connected to the first node, and

the fifth switch element includes a first electrode connected to the initialization voltage line, a gate electrode to which the second gate signal is for being applied, and a second electrode connected to the second node.

6 . The pixel circuit of claim 3 , wherein the driving element includes the gate electrode connected to a third node, a first electrode connected to a fifth node, and a second electrode connected to a fourth node,

the capacitor is connected between a power line to which a pixel driving voltage is for being applied and the third node, and

the third switch element is connected between the third node and the voltage line to which the reference voltage is for being applied, and

wherein the compensation circuit further includes:

a sixth switch element connected between the third node and the fourth node;

a seventh switch element connected between the fifth node and a data line;

an eighth switch element connected between the fifth node and a bias voltage line to which a bias voltage is for being applied; and

a ninth switch element connected between the power line and the fifth node.

7 . The pixel circuit of claim 6 , wherein:

the fourth switch element includes a first electrode connected to the initialization voltage line, a gate electrode to which a second gate signal is for being applied, and a second electrode connected to the first node, and

the fifth switch element includes a first electrode connected to the initialization voltage line, a gate electrode to which the second gate signal is for being applied, and a second electrode connected to the second node.

8 . The pixel circuit of claim 5 , wherein the initialization voltage line includes:

a first initialization voltage line configured to apply a first initialization voltage to the anode electrode of the first light-emitting element; and

a second initialization voltage line configured to apply a second initialization voltage to the anode electrode of the second light-emitting element, and

wherein the first initialization voltage is set to be lower than the second initialization voltage.

9 . A display device, comprising:

a pixel array in which a plurality of data lines, a plurality of gate lines, a plurality of voltage lines, and a plurality of pixel circuits are disposed;

a data driver configured to output data voltages to the plurality of data lines; and

a gate driver configured to output gate signals to the plurality of gate lines,

wherein each of the plurality of pixel circuits includes:

a first light-emitting element;

a second light-emitting element;

a driving element configured to drive the first and second light-emitting elements;

a first switch element connected between the driving element and the first light-emitting element;

a second switch element connected between the driving element and the second light-emitting element; and

a compensation circuit, including:

a capacitor connected to a gate electrode of the driving element;

a third switch element directly connected between a voltage line to which a reference voltage is for being applied and one electrode of the capacitor;

a fourth switch element directly connected between a first node to which an anode electrode of the first light-emitting element is connected and an initialization voltage line to which an initialization voltage is for being applied;

a fifth switch element directly connected between a second node to which an anode electrode of the second light-emitting element is connected and the initialization voltage line; and

a switch element connected between a node of the driving element and a sixth node,

wherein:

the first switch element includes a first electrode connected to the sixth node, a second electrode connected to the first node, and a gate electrode to which a first gate signal is for being applied; and

the second switch element includes a first electrode connected to the sixth node, a second electrode connected to the second node, and a gate electrode to which the first gate signal is for being applied.

10 . The display device of claim 9 , wherein

a first repair capacitor is formed between the initialization voltage line and the first node, and

a second repair capacitor is formed between the initialization voltage line and the second node.

11 . The display device of claim 10 , wherein the driving element includes the gate electrode connected to a fourth node, a first electrode connected to a power line to which a pixel driving voltage is for being applied, and a second electrode connected to a fifth node,

the capacitor is connected between a third node and the fourth node, and

the third switch element is connected between the third node and the voltage line to which the reference voltage is for being applied, and

wherein the compensation circuit further includes:

a sixth switch element connected between the third node and a data line; and

a seventh switch element connected between the fourth node and the fifth node.

12 . The display device of claim 11 , wherein:

the fourth switch element includes a first electrode connected to the initialization voltage line, a gate electrode to which a second gate signal is for being applied, and a second electrode connected to the first node, and

the fifth switch element includes a first electrode connected to the initialization voltage line, a gate electrode to which the second gate signal is for being applied, and a second electrode connected to the second node.

13 . The display device of claim 10 , wherein the driving element includes the gate electrode connected to a third node, a first electrode connected to a fifth node, a second electrode connected to a fourth node,

the capacitor is connected between a power line to which a pixel driving voltage is for being applied and the third node, and

the third switch element is connected between the third node and the voltage line to which the reference voltage is for being applied, and

wherein the compensation circuit further includes:

a sixth switch element connected between the third node and the fourth node;

a seventh switch element connected between the fifth node and a data line;

an eighth switch element connected between the fifth node and a bias voltage line to which a bias voltage is for being applied; and

a ninth switch element connected between the power line and the fifth node.

14 . The display device of claim 13 , wherein:

the fourth switch element includes a first electrode connected to the initialization voltage line, a gate electrode to which a second gate signal is for being applied, and a second electrode connected to the first node, and

the fifth switch element includes a first electrode connected to the initialization voltage line, a gate electrode to which the second gate signal is for being applied, and a second electrode connected to the second node.

15 . The display device of claim 12 , wherein the initialization voltage line includes:

a first initialization voltage line configured to apply a first initialization voltage to the anode electrode of the first light-emitting element; and

a second initialization voltage line configured to apply a second initialization voltage to the anode electrode of the second light-emitting element, and

wherein the first initialization voltage is set to be lower than the second initialization voltage.

16 . The display device of claim 9 ,

wherein the initialization voltage line includes:

a first-first initialization voltage line;

a first-second initialization voltage line;

a second-first initialization voltage line; and

a second-second initialization voltage line, and

wherein:

the first-first initialization voltage line is configured to apply a first-first initialization voltage to an anode electrode of a first light-emitting element included in a pixel circuit of a red sub-pixel;

the first-second initialization voltage line is configured to apply a first-second initialization voltage to anode electrodes of first light-emitting elements included in pixel circuits of green and blue sub-pixels;

the second-first initialization voltage line is configured to apply a second-first initialization voltage to an anode electrode of a second light-emitting element included in the pixel circuit of the red sub-pixel; and

the second-second initialization voltage line is configured to apply a second-second initialization voltage to anode electrodes of second light-emitting elements included in the pixel circuits of the green and blue sub-pixels.

17 . The display device of claim 16 , wherein:

the second-first initialization voltage is set to be higher than the first-first initialization voltage;

the first-second initialization voltage is set to be higher than the second-first initialization voltage; and

the second-second initialization voltage is set to be higher than the first-second initialization voltage.

18 . The display device of claim 9 , wherein:

the first light-emitting element is configured to emit light with a first viewing angle;

the second light-emitting element is configured to emit light with a second viewing angle; and

the second viewing angle is wider than the first viewing angle.

19 . The display device of claim 9 , wherein each of the plurality of pixel circuits further includes:

a selection switch element connected between a mode line to which a mode selection signal is for being applied and respective gate electrodes of the first and second switch elements; and

a second capacitor connected between the selection switch element and a power line, and

wherein the selection switch element is configured to apply the mode selection signal to the respective gate electrodes of the first and second switch elements.

20 . The display device of claim 10 , wherein one of the first repair capacitor and the second repair capacitor is short-circuited.

21 . The display device of claim 9 ,

wherein the plurality of voltage lines include the initialization voltage line to which the initialization voltage is for being applied, and

wherein the initialization voltage line includes:

a first voltage line which is disposed in a non-display area surrounding a display area for displaying an image and which is configured to receive the initialization voltage from a power supply; and

a plurality of second voltage lines which are disposed in the display area, which are branched from the first voltage line, and which are configured to supply the initialization voltage to a plurality of sub-pixels.

22 . The display device of claim 21 , wherein the plurality of second voltage lines include:

a plurality of second-first voltage lines branched from a part of the first voltage line, wherein the plurality of second-first voltage lines are disposed in a first axial direction, and wherein each of the plurality of second-first voltage lines is configured to supply the initialization voltage to one or more corresponding sub-pixels of the plurality of sub-pixels; and

a plurality of second-second voltage lines branched from a part of the first voltage line, wherein the plurality of second-second voltage lines are disposed in a second axial direction perpendicular to the first axial direction.

23 . The display device of claim 22 , wherein each of the plurality of second-second voltage lines connects two parts of the first voltage line respectively disposed in the second axial direction.

24 . The display device of claim 21 , wherein each of the plurality of second voltage lines has a width smaller than a width of the first voltage line and has a thickness smaller than a thickness of the first voltage line.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (13)