US-20260128001-A1 - ELECTRONIC DEVICE

Abstract

An electronic device includes a signal controller and a light emitting control circuit. A plurality of clock signals include a first clock signal having a first frequency and a second clock signal having a second frequency lower than the first frequency. The signal controller outputs the first clock signal in a first mode, and the light emitting control circuit outputs a first light emitting control signal having a first turn-on duration in the first mode. The signal controller outputs the second clock signal in a second mode, and the light emitting control circuit outputs a second light emitting control signal having a second turn-on duration in the second mode. The first turn-on duration has a pulse width equal to a period of the first clock signal, and the second turn-on duration has a pulse width equal to a period of the second clock signal.

Inventors

• Sehyun Lee
• Kwihyun KIM
• Sunhwa Lee
• Kyunghoon Chung

Assignees

• SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date

20260507

Application Date

20250814

Priority Date

20241104

Claims (20)

1. 1 . An electronic device comprising: a display panel that displays an image and including a pixel including a light emitting element and a pixel circuit electrically connected to the light emitting element; a signal controller that determines an operating mode of the display panel, and outputs a plurality of clock signals; and a light emitting control circuit that receives the plurality of clock signals and outputs a light emitting control signal having a turn-on duration for controlling transmission of a current provided to the light emitting element, wherein the operating mode includes a first mode driven in a first brightness range and a second mode driven in a second brightness range wider than the first brightness range, wherein the plurality of clock signals include a first clock signal having a first frequency and a second clock signal having a second frequency lower than the first frequency, wherein the signal controller is configured to output the first clock signal in the first mode, and the light emitting control circuit is configured to output a first light emitting control signal having a first turn-on duration in the first mode, wherein the signal controller is configured to output the second clock signal in the second mode, and the light emitting control circuit is configured to output a second light emitting control signal having a second turn-on duration in the second mode, and wherein a pulse width of the first turn-on duration is substantially equal to a period of the first clock signal, and a pulse width of the second turn-on duration is substantially equal to a period of the second clock signal.
2. 2 . The electronic device of claim 1 , wherein a maximum brightness of the second brightness range is at least 100 times of a maximum brightness of the first brightness range.
3. 3 . The electronic device of claim 2 , wherein the maximum brightness of the first brightness range is about 5 nits, and the maximum brightness of the second brightness range is about 600 nits.
4. 4 . The electronic device of claim 2 , wherein a duty ratio of the second turn-on duration is at least four times a duty ratio of the first turn-on duration.
5. 5 . The electronic device of claim 2 , wherein the plurality of clock signals include a first color clock signal having a first color frequency, a second color clock signal having a second color frequency, and a third color clock signal having a third color frequency, wherein the first color frequency, the second color frequency, and the third color frequency are different from each other, wherein the signal controller is configured to output the first color clock signal, the second color clock signal, and the third color clock signal, in the first mode, and wherein the second color frequency is higher than the first color frequency, and the third color frequency is higher than the second color frequency.
6. 6 . The electronic device of claim 5 , wherein the light emitting control circuit is configured to output a first color light emitting control signal by receiving the first color clock signal, output a second color light emitting control signal by receiving the second color clock signal, and output a third color light emitting control signal by receiving the third color clock signal.
7. 7 . The electronic device of claim 6 , wherein the pixel is provided in plurality, and the plurality of pixels include a red pixel, a green pixel, and a blue pixel, and wherein the red pixel receives the first color light emitting control signal, the green pixel receives the second color light emitting control signal, and the blue pixel receives the third color light emitting control signal.
8. 8 . The electronic device of claim 7 , wherein the first color light emitting control signal, the second color light emitting control signal, and the third color light emitting control signal are substantially equal to each other, in the second mode.
9. 9 . The electronic device of claim 1 , wherein the signal controller further outputs a third clock signal having a third frequency between the first frequency and the second frequency, wherein the operating mode further includes a third mode driven in a third brightness range, and wherein the signal controller is configured to output the third clock signal in the third mode, and the light emitting control circuit is configured to output a third light emitting control signal having a third turn-on duration.
10. 10 . The electronic device of claim 9 , wherein a maximum brightness of the first brightness range is about 5 nits, a maximum brightness of the second brightness range is about 600 nits, and a maximum brightness of the third brightness range is about 126 nits.
11. 11 . The electronic device of claim 10 , wherein a duty ratio of the third turn-on duration is greater than a duty ratio of the first turn-on duration.
12. 12 . The electronic device of claim 1 , wherein the first mode is an Always on display (AOD) mode.
13. 13 . The electronic device of claim 1 , wherein the light emitting element is a micro-light emitting diode.
14. 14 . The electronic device of claim 1 , further comprising: a housing accommodating the display panel including in the housing and a strap coupled to the housing.
15. 15 . An electronic device comprising: a display panel including a pixel including a light emitting element; a signal controller that selectively drives the display panel in a first mode or a second mode different from the first mode, and outputs a first clock signal having a first frequency and a second clock signal having a second frequency lower than the first frequency; a light emitting stage that receives one of the first clock signal and the second clock signal, and outputs a light emitting control signal having a turn-on duration for controlling transmission of a current provided to the light emitting element; a housing accommodating the display panel included in the housing; and a strap coupled to the housing, wherein the signal controller outputs the first clock signal in the first mode, and the light emitting stage outputs a first light emitting control signal having a first turn-on duration, wherein the signal controller outputs the second clock signal in the second mode, and the light emitting stage outputs a second light emitting control signal having a second turn-on duration, and wherein the first turn-on duration has a pulse width equal to a period of the first clock signal, and the second turn-on duration has a pulse width equal to a period of the second clock signal.
16. 16 . The electronic device of claim 15 , wherein the first mode is driven in a first brightness range and the second mode is driven in a second brightness range wider than the first brightness range, and a maximum brightness of the second brightness range is at least 100 times of a maximum brightness of the first brightness range, and a duty ratio of the second turn-on duration is at least four times a duty ratio of the first turn-on duration.
17. 17 . The electronic device of claim 16 , wherein a plurality of clock signals include a first color clock signal having a first color frequency, a second color clock signal having a second color frequency, and a third color clock signal having a third color frequency, wherein the first color frequency, the second color frequency, and the third color frequency are different from each other, wherein the signal controller is configured to output the first color clock signal, the second color clock signal, and the third color clock signal, in the first mode and wherein the second color frequency is higher than the first color frequency, and the third color frequency is higher than the second color frequency.
18. 18 . The electronic device of claim 17 , wherein the pixel includes a plurality of pixels, and the plurality of pixels include a red pixel, a green pixel, and a blue pixel, and wherein the light emitting stage is configured to output a first color light emitting control signal to the red pixel by receiving the first color clock signal, output a second color light emitting control signal to the green pixel by receiving the second color clock signal, and output a third color light emitting control signal to the blue pixel by receiving the third color clock signal.
19. 19 . The electronic device of claim 18 , wherein the first color light emitting control signal, the second color light emitting control signal, and the third color light emitting control signal are substantially equal to each other, in the second mode.
20. 20 . The electronic device of claim 15 , wherein the light emitting element is a micro-light emitting diode.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application claims priority to and the benefits of Korean Patent Application No. 10-2024-0154001 under 35 U.S.C. § 119, filed Nov. 4, 2024, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. BACKGROUND Embodiments described herein relate to an electronic device with reduced power consumption and improved display quality. Multimedia electronic devices, such as a smart watch, a television, a cellular phone, a tablet computer, a navigation system, and a game console, include a display device that displays an image. The display device includes a display panel and a panel driving circuit. The panel driving circuit includes a data control circuit to provide a data voltage to data lines, a gate control circuit to provide a gate signal to gate lines, and a light emitting control circuit to provide a light emitting control signal to light emitting control lines. SUMMARY Embodiments provide an electronic device reduced in power consumption, and improved in display quality. According to an embodiment, an electronic device may include a display panel that displays an image and including a pixel including a light emitting element and a pixel circuit electrically connected to the light emitting element, a signal controller that determines an operating mode of the display panel, and outputs a plurality of clock signals, and a light emitting control circuit to receive the plurality of clock signals and output a light emitting control signal having a turn-on duration for controlling transmission of a current provided to the light emitting element. The operating mode may include a first mode driven in a first brightness range and a second mode driven in a second brightness range wider than the first brightness range, and the plurality of clock signals may include a first clock signal having a first frequency and a second clock signal having a second frequency lower than the first frequency. The signal controller may output the first clock signal in the first mode, and the light emitting control circuit may output a first light emitting control signal having a first turn-on duration in the first mode. The signal controller may output the second clock signal in the second mode, and the light emitting control circuit may output a second light emitting control signal having a second turn-on duration in the second mode. A pulse width of the first turn-on duration may be substantially equal to a period of the first clock signal, and a pulse width of the second turn-on duration may be substantially equal to a period of the second clock signal. According to an embodiment, a maximum brightness of the second brightness range may be at least 100 times of a maximum brightness of the first brightness range. According to an embodiment, a maximum brightness of the first brightness range may be about 5 nits, a maximum brightness of the second brightness range may be about 600 nits. According to an embodiment, a duty ratio of the second turn-on duration may be at least four times a duty ratio of the first turn-on duration. According to an embodiment, the plurality of clock signals may include a first color clock signal having a first color frequency, a second color clock signal having a second color frequency, and a third color clock signal having a third color frequency, and the first color frequency, the second color frequency, and the third color frequency may be different from each other. The signal controller may output the first color clock signal, the second color clock signal, and the third color clock signal, in the first mode and the second color frequency may be higher than the first color frequency, and the third color frequency may be higher than the second color frequency. According to an embodiment, the light emitting control circuit may output a first color light emitting control signal by receiving the first color clock signal, output a second color light emitting control signal by receiving the second color clock signal, and output a third color light emitting control signal by receiving the third color clock signal. According to an embodiment, the pixel may be provided in plurality, and the plurality of pixels may include a red pixel, a green pixel, and a blue pixel. The red pixel may receive the first color light emitting control signal, the green pixel may receive the second color light emitting control signal, and the blue pixel may receive the third color light emitting control signal. According to an embodiment, the first color light emitting control signal, the second color light emitting control signal, and the third color light emitting control signal may be substantially equal to each other, in the second mode. According to an embodiment, the signal controller may further output a third clock signal having a third frequency between the first frequency and the second frequency, the operating mode further may i