Granted Patent B2

US 12,731,532 · App. 18/984,530 · Granted Sep 8, 2026

Inventors: Wonkeun Park (Suwon-si, KR); Youngki Jung (Suwon-si, KR)

Assignee: SAMSUNG ELECTRONICS CO., LTD.

G09G3/32G09G2300/0852G09G2310/08G09G2320/0257

Abstract

Claims (44)

1 . A display device comprising:

a display panel comprising:

a pixel array comprising pixels arranged in a plurality of row lines, the pixels comprising a plurality of inorganic light-emitting elements; and

sub-pixel circuits corresponding to the plurality of inorganic light-emitting elements of the pixel array; and

a driver configured to:

obtain a reset voltage by measuring a voltage value at which a stain is removed after displaying a monochromatic test image on the display panel;

store the reset voltage in the display device;

set an image data voltage corresponding to an image frame in sub-pixels of the plurality of row lines in the sub-pixel circuits;

apply the stored reset voltage in the sub-pixels of the plurality of row lines in an anode terminal of the inorganic light-emitting elements; and

drive the sub-pixel circuits so that an inorganic light-emitting element, of the inorganic light-emitting elements, emits light based on the set image data voltage and the stored reset voltage,

wherein the stored reset voltage is a voltage for compensating for at least one of an electrical characteristic deviation of the inorganic light-emitting element or a ground voltage deviation applied to a cathode terminal of the inorganic light-emitting elements.

2 . The display device as claimed in claim 1 , wherein the stored reset voltage is applied to the anode terminal of the inorganic light-emitting element through a line separate from a line through which the image data voltage is applied.

3 . The display device as claimed in claim 1 , wherein the driver comprises:

a first data driver configured to provide the image data voltage; and

a second data driver configured to provide the stored reset voltage.

4 . The display device as claimed in claim 3 , wherein each of the sub-pixel circuits comprises a reset transistor configured to apply the stored reset voltage provided by the second data driver to the anode terminal of the inorganic light-emitting elements while turned on.

5 . The display device as claimed in claim 4 , wherein the driver is further configured to set the image data voltage in the sub-pixels of the plurality of row lines in the sub-pixel circuits by applying a scan signal in the sub-pixels of the plurality of row lines; and

wherein the reset transistor is turned on based on the scan signal.

6 . The display device as claimed in claim 4 , wherein the driver is further configured to:

set the image data voltage in the sub-pixels of the plurality of row lines in the sub-pixel circuits by applying a first scan signal in the sub-pixels of the plurality of row lines; and

turn on the reset transistor in the sub-pixels of the plurality of row lines by applying a second scan signal separate from the first scan signal in the sub-pixels of the plurality of row lines.

7 . The display device as claimed in claim 1 , wherein the stored reset voltage applied in the anode terminal of the inorganic light-emitting element is maintained by parasitic capacitance formed between the anode terminal and the cathode terminal of each inorganic light-emitting element until each inorganic light-emitting element emits light.

8 . The display device as claimed in claim 1 , wherein the inorganic light-emitting element is configured to emit light according to driving current provided from the sub-pixel circuits, and

wherein each of the sub-pixel circuits comprises at least one of a Pulse Amplitude Modulation (PAM) circuit for controlling a magnitude of the driving current based on the image data voltage or a Pulse Width Modulation (PWM) circuit for controlling a pulse width of the driving current based on the image data voltage.

9 . The display device as claimed in claim 8 , wherein the PAM circuit comprises a first drive transistor and the PWM circuit comprises a second drive transistor, and

wherein a first threshold voltage of the first drive transistor is compensated when the image data voltage is set in the sub-pixel circuits, and

wherein a second threshold voltage of the second drive transistor is compensated when the image data voltage is set in the sub-pixel circuits.

10 . A controlling method of a display device comprising a display panel, the display panel comprising a pixel array comprising pixels that are arranged in a plurality of row lines and comprise a plurality of inorganic light-emitting elements, and sub-pixel circuits corresponding to the plurality of inorganic light-emitting elements of the pixel array, the controlling method comprising:

obtaining a reset voltage by measuring a voltage value at which a stain is removed after displaying a monochromatic test image on the display panel;

storing the reset voltage in the display device;

setting an image data voltage corresponding to an image frame in sub-pixels of the plurality of row lines in the sub-pixel circuits, and applying the stored reset voltage in the sub-pixels of the plurality of row lines in an anode terminal of the inorganic light-emitting elements; and

driving the sub-pixel circuits so that an inorganic light-emitting element, of the plurality of inorganic light-emitting elements, emits light based on the set image data voltage and the stored reset voltage,

wherein the stored reset voltage is a voltage for compensating for at least one of an electrical characteristic deviation of the inorganic light-emitting element or a ground voltage deviation applied to a cathode terminal of the inorganic light-emitting elements.

11 . The controlling method as claimed in claim 10 , wherein the stored reset voltage is applied to the anode terminal of the inorganic light-emitting element through a line separate from a line through which the image data voltage is applied.

12 . The controlling method as claimed in claim 10 , wherein the display device comprises:

a first data driver configured to provide the image data voltage; and

a second data driver configured to provide the stored reset voltage.

13 . The controlling method as claimed in claim 12 , wherein each of the sub-pixel circuits comprises a reset transistor configured to apply the stored reset voltage provided from the second data driver to the anode terminal of the inorganic light-emitting elements while turned on.

14 . The controlling method as claimed in claim 13 , wherein the setting comprises:

applying a scan signal in the sub-pixels of the plurality of row lines to set the image data voltage in the sub-pixels of the plurality of row lines in the sub-pixel circuits; and

wherein the reset transistor is turned on based on the scan signal.

15 . The controlling method as claimed in claim 13 , wherein the setting comprises:

applying a first scan signal in the sub-pixels of the plurality of row lines to set the image data voltage in the sub-pixels of the plurality of row lines in the sub-pixel circuits; and

applying a second scan signal separate from the first scan signal in the sub-pixels of the plurality of row lines to turn on the reset transistor in the sub-pixels of the plurality of row lines.

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (33)