IP Library › Granted Patent US 12670862
Granted Patent B2
US 12670862 · App. 19/243,057 · Granted Jun 30, 2026

Display device, driving method, and electronic device

Inventor: Si Beak Pyo (Yongin-si, KR)
Assignee: SAMSUNG DISPLAY CO., LTD.
G09G3/3233G09G3/2007G09G3/32G09G2300/0819G09G2300/0842G09G2300/0861G09G2310/08G09G2320/0233
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 12670862
App. No.
19/243,057
Granted
Jun 30, 2026
Kind
B2
Abstract

A display device includes a plurality of pixels, an emission driver configured to provide emission signals that control light emitting periods of the pixels, and an emission signal adjustment circuit configured to adjust at least one of a waveform of the emission signals and a timing of the emission signals. The emission signal adjustment circuit adjusts the at least one of the waveform of the emission signals and the timing of the emission signals based on a maximum luminance of the display device and grayscales of an input image.

Claims (49)

1 . A display device, comprising:

a plurality of pixels;

an emission driver configured to provide emission signals that control light emitting periods of the pixels; and

an emission signal adjustment circuit configured to adjust at least one of a waveform of the emission signals and a timing of the emission signals,

wherein the emission signal adjustment circuit adjusts the at least one of the waveform of the emission signals and the timing of the emission signals based on a maximum luminance of the display device and grayscales of an input image.

2 . The display device of claim 1 , wherein the pixels include light-emitting elements,

wherein the display device further includes a scan driver configured to provide scan signals that control a timing at which an anode initialization voltage is applied to anode electrodes of the light-emitting elements,

wherein the emission signal adjustment circuit adjusts the emission signals such that a time point at which a voltage level of an emission signal among the emission signals changes is further away from a time point at which a voltage level of a corresponding scan signal changes.

3 . The display device of claim 1 , wherein the emission driver sequentially changes an emission signal among the emission signals to a first voltage level, a second voltage level greater than the first voltage level, and a third voltage level greater than the second voltage level,

wherein the emission signal adjustment circuit adjusts the emission signal such that a period during which the emission signal is maintained at the second voltage level increases.

4 . The display device of claim 1 , wherein the emission signal adjustment circuit adjusts the emission signals such that a slew rate of an emission signal among the emission signals is reduced.

5 . The display device of claim 1 , wherein the emission signal adjustment circuit includes:

a reference color selection circuit configured to select a reference color based on a difference value between an anode initialization voltage and a power source voltage applied to a cathode electrode of light-emitting elements of the pixels.

6 . The display device of claim 5 , wherein the emission signal adjustment circuit further includes:

an average grayscale calculation circuit configured to calculate an average grayscale by calculating an average value of grayscales corresponding to the reference color among the input image.

7 . The display device of claim 6 , wherein the emission signal adjustment circuit further includes:

an adjustment decision circuit configured to determine whether to adjust the emission signals based on the average grayscale and the maximum luminance.

8 . The display device of claim 7 , wherein the adjustment decision circuit determines a first threshold value and a second threshold value based on the maximum luminance, and adjusts the at least one of the waveform of the emission signals and the timing of the emission signals when the average grayscale corresponds to a value between the first threshold value and the second threshold value.

9 . The display device of claim 8 , wherein the adjustment decision circuit determines a difference between the first threshold value and the second threshold value to be smaller as the maximum luminance increases.

10 . The display device of claim 8 , wherein the adjustment decision circuit further determines a third threshold value and a fourth threshold value corresponding to values between the first threshold value and the second threshold value, and adjusts the at least one of the waveform of the emission signals and the timing of the emission signals to a maximum value when the average value corresponds to a value between the third threshold value and the fourth threshold value.

11 . A method of driving a display device, comprising:

receiving a maximum luminance of the display device and grayscales of an input image;

adjusting at least one of a waveform of emission signals and a timing of the emission signals based on the maximum luminance and the grayscales; and

providing the emission signals to a plurality of pixels.

12 . The method of claim 11 , wherein the pixels include light-emitting elements,

wherein the method further includes providing scan signals that control a timing at which an anode initialization voltage is applied to anode electrodes of the light-emitting elements,

wherein adjusting the at least one of the waveform of the emission signals and the timing of the emission signals comprises adjusting the emission signals such that a time point at which a voltage level of an emission signal among the emission signals changes is further away from a time point at which a voltage level of a corresponding scan signal changes.

13 . The method of claim 11 , wherein an emission signal among the emission signals is sequentially changed to a first voltage level, a second voltage level greater than the first voltage level, and a third voltage level greater than the second voltage level,

wherein adjusting the at least one of the waveform of the emission signals and the timing of the emission signals comprises adjusting the emission signals such that a period during which the emission signal is maintained at the second voltage level increases.

14 . The method of claim 11 , wherein adjusting the at least one of the waveform of the emission signals and the timing of the emission signals comprises adjusting the emission signals such that a slew rate of an emission signal among the emission signals is reduced.

15 . The method of claim 11 , wherein adjusting the at least one of the waveform of the emission signals and the timing of the emission signals includes:

selecting a reference color based on a difference value between an anode initialization voltage and a power source voltage applied to a cathode electrode of light-emitting elements of the pixels.

16 . The method of claim 15 , wherein adjusting at least one of the waveform of the emission signals and the timing of the emission signals further includes:

calculating an average grayscale by calculating an average value of grayscales corresponding to the reference color among the input image.

17 . The method of claim 16 , wherein adjusting the at least one of the waveform of the emission signals and the timing of the emission signals further includes:

determining whether to adjust the emission signals based on the average grayscale and the maximum luminance.

18 . The method of claim 17 , wherein determining whether to adjust the emission signals comprises determining a first threshold value and a second threshold value based on the maximum luminance, and the at least one of the waveform of the emission signals and the timing of the emission signals is adjusted when the average grayscale corresponds to a value between the first threshold value and the second threshold value.

19 . An electronic device, comprising:

a processor;

a memory having stored application programs for execution by the processor;

a display device, comprising:

a plurality of pixels;

an emission driver configured to provide emission signals that control light emitting periods of the pixels; and

an emission signal adjustment circuit configured to adjust at least one of a waveform of the emission signals and a timing of the emission signals,

wherein the emission signal adjustment circuit adjusts the at least one of the waveform of the emission signals and the timing of the emission signals based on a maximum luminance of the display device and grayscales of an input image; and

a user interface configured to sense user input via touch or cursor select of an icon presented on the display device, wherein the processor is caused to execute one or more of the stored application programs upon receipt of the user input.

20 . The electronic device of claim 19 , wherein the pixels include light-emitting elements,

wherein the display device further includes a scan driver configured to provide scan signals that control a timing at which an anode initialization voltage is applied to anode electrodes of the light-emitting elements,

wherein the emission signal adjustment circuit adjusts the emission signals such that a time point at which a voltage level of an emission signal among the emission signals changes is further away from a time point at which a voltage level of a corresponding scan signal changes.