KR-20260065031-A - DISPLAY DEVICE AND ELECTRONIC APPARATUS INCLUDING THE SAME

KR20260065031AKR 20260065031 AKR20260065031 AKR 20260065031AKR-20260065031-A

Abstract

The display device includes a display panel including a pixel, a scan driver that provides a first scan signal and a second scan signal to the pixel, and a power management circuit that provides a first power supply voltage and a second power supply voltage to the pixel. The second scan signal includes an active pulse located within an active interval having a fixed time length and a plurality of dummy pulses located within a vertical blank interval having a variable time length, wherein the widths of the dummy pulses of the second scan signal are smaller than the width of the active pulse of the second scan signal, and the intervals between the dummy pulses of the second scan signal are smaller than the interval between the active pulse of the second scan signal and the first dummy pulse.

Inventors

김홍규

Assignees

삼성디스플레이 주식회사

Dates

Publication Date: 20260508
Application Date: 20241031

Claims (20)

A display panel including pixels; A scan driver that provides a first scan signal and a second scan signal to the pixel; and It includes a power management circuit that provides a first power supply voltage and a second power supply voltage to the pixel, and The second scan signal includes an active pulse located within an active section having a fixed time length and a plurality of dummy pulses located within a vertical blank section having a variable time length, and The widths of the dummy pulses of the second scan signal are smaller than the widths of the active pulses of the second scan signal, and A display device in which the intervals between the dummy pulses of the second scan signal are smaller than the interval between the active pulse and the first dummy pulse of the second scan signal.
In Article 1, A display device in which the widths of the dummy pulses of the second scan signal are the same.
In Article 1, A display device in which the intervals between the dummy pulses of the second scan signal are the same.
In Article 1, The above pixel is, A first transistor comprising a gate connected to a first node, a first terminal receiving the first power supply voltage, and a second terminal connected to a second node; A second transistor comprising a gate for receiving the first scan signal, a first terminal for receiving a data voltage, and a second terminal connected to the first node; A third transistor comprising a gate for receiving the second scan signal, a first terminal for receiving a reference voltage, and a second terminal connected to the second node; A capacitor comprising a first terminal connected to the first node and a second terminal connected to the second node; and A display device comprising a light-emitting diode having a first terminal connected to the second node and a second terminal receiving the second power supply voltage.
In Paragraph 4, In the above active section, in response to the pulse of the first scan signal and the active pulse of the second scan signal, the capacitor stores the difference between the data voltage and the reference voltage, and A display device in which the reference voltage is applied to the second node in response to the dummy pulses of the second scan signal in the vertical blank section.
In Article 5, A display device in which the voltage level of the above reference voltage is lower than the voltage level of the threshold voltage of the above light-emitting diode.
In Paragraph 4, A display device wherein the first scan signal includes a pulse located within the active section and has an inactive level in the vertical blank section.
In Paragraph 4, The above first power supply voltage has a constant high voltage level, A display device in which the second power supply voltage has a constant low voltage level lower than the high voltage level.
A display panel including pixels; A scan driver that provides a first scan signal and a second scan signal to the pixel; and It includes a power management circuit that provides power voltage to the pixel above, and The second scan signal includes an active pulse located within an active interval having a fixed time length, and The above power supply voltage includes a plurality of pulses located in a vertical blank section having a variable time length, and The widths of the pulses of the above power supply voltage are smaller than the width of the active pulse of the second scan signal, and A display device in which the intervals between the pulses of the power supply voltage are smaller than the interval between the active pulse of the second scan signal and the first pulse of the power supply voltage.
In Article 9, A display device in which the widths of the pulses of the above power supply voltage are the same as each other.
In Article 9, A display device in which the intervals between the pulses of the above power supply voltage are the same.
In Article 9, The above pixel is, A first transistor comprising a gate connected to a first node, a first terminal receiving a first power supply voltage, and a second terminal connected to a second node; A second transistor comprising a gate for receiving the first scan signal, a first terminal for receiving a data voltage, and a second terminal connected to the first node; A third transistor comprising a gate for receiving the second scan signal, a first terminal for receiving a reference voltage, and a second terminal connected to the second node; A capacitor comprising a first terminal connected to the first node and a second terminal connected to the second node; and It includes a light-emitting diode comprising a first terminal connected to the second node and a second terminal receiving a second power supply voltage, and A display device in which the above power supply voltage is the first power supply voltage or the second power supply voltage.
In Article 12, The above power supply voltage is the first power supply voltage, and has a constant high voltage level in the active section, A display device in which the pulses of the above power supply voltage have a low voltage level lower than the above high voltage level.
In Article 12, The above power supply voltage is the above second power supply voltage, and has a constant low voltage level in the above active section, A display device in which the pulses of the above power supply voltage have a high voltage level higher than the low voltage level.
In Article 12, A display device wherein the first scan signal includes a pulse located within the active section and has an inactive level in the vertical blank section.
In Article 12, A display device in which the second scan signal has an inactive level in the vertical blank section.
In an electronic device comprising a display device and a processor controlling said display device, said display device, the display device is A display panel including pixels; A scan driver that provides a first scan signal and a second scan signal to the pixel; and It includes a power management circuit that provides a first power supply voltage and a second power supply voltage to the pixel, and The second scan signal includes an active pulse located within an active section having a fixed time length and a plurality of dummy pulses located within a vertical blank section having a variable time length, and The widths of the dummy pulses of the second scan signal are smaller than the widths of the active pulses of the second scan signal, and An electronic device in which the intervals between the dummy pulses of the second scan signal are smaller than the interval between the active pulse and the first dummy pulse of the second scan signal.
In Article 17, An electronic device in which the widths of the dummy pulses of the second scan signal are the same.
In Article 17, An electronic device in which the intervals between the dummy pulses of the second scan signal are the same.
In Article 17, The above pixel is, A first transistor comprising a gate connected to a first node, a first terminal receiving the first power supply voltage, and a second terminal connected to a second node; A second transistor comprising a gate for receiving the first scan signal, a first terminal for receiving a data voltage, and a second terminal connected to the first node; A third transistor comprising a gate for receiving the second scan signal, a first terminal for receiving a reference voltage, and a second terminal connected to the second node; A capacitor comprising a first terminal connected to the first node and a second terminal connected to the second node; and An electronic device comprising a light-emitting diode having a first terminal connected to the second node and a second terminal receiving the second power supply voltage.

Description

Display device and electronic apparatus including the same The present invention relates to a display device. More specifically, the present invention relates to a display device driven by a variable refresh rate and an electronic device including the same. The display device may include a display panel, a scan driver, and a power management circuit. The display panel may include pixels for displaying an image. The scan driver may provide scan signals to the pixels. The power management circuit may provide power supply voltages to the pixels. The display device can be driven in a variable refresh rate (VRR) mode in which the driving frequency of the display panel can be varied. When the display device displays video, the driving frequency of the display panel can be increased to improve the image quality of the display device. When the display device displays still images, the driving frequency of the display panel can be decreased to reduce the power consumption of the display device. FIG. 1 is a block diagram showing a display device according to one embodiment. Figure 2 is a circuit diagram showing the pixel of Figure 1. Figure 3 is a diagram illustrating the variable refresh rate mode of the display device of Figure 1. FIG. 4 is a timing diagram for explaining the operation of a pixel at first and second frequencies according to the prior art. FIG. 5 is a timing diagram showing the brightness of a display device at first and second frequencies according to the prior art. Figure 6 is a diagram illustrating the operation of a pixel at a second frequency when using dummy off-drive. Figure 7 is a timing diagram showing the brightness of the display device at the second frequency when using dummy off-drive. Figure 8 is a graph showing the relationship between the frequency and brightness of a display device when dummy off-drive is not used and when dummy off-drive is used. FIG. 9 is a diagram showing the number of times the light-emitting diode is turned off and the brightness at the first to fifth frequencies when a dummy off drive is used. FIG. 10 is a timing diagram showing a first scan signal, a second scan signal, a first power supply voltage, a second power supply voltage, and brightness according to one embodiment. Figure 11 is a graph showing the relationship between the frequency and brightness of a display device when using dummy off-drive and when using split dummy off-drive. Figure 12 is a diagram showing the brightness of a display device at the same frequency when using dummy off-drive and when using split dummy off-drive. FIG. 13 is a timing diagram showing a first scan signal, a second scan signal, a first power supply voltage, a second power supply voltage, and brightness according to one embodiment. FIG. 14 is a timing diagram showing a first scan signal, a second scan signal, a first power supply voltage, a second power supply voltage, and brightness according to one embodiment. FIG. 15 is a block diagram showing an electronic device according to one embodiment. FIG. 16 is a diagram showing an example in which the electronic device of FIG. 15 is implemented as a computer monitor. Hereinafter, a display device and an electronic device according to embodiments of the present invention may be described in more detail with reference to the attached drawings. Identical or similar reference numerals may be used for identical components in the attached drawings. FIG. 1 is a block diagram showing a display device (100) according to one embodiment. Referring to FIG. 1, the display device (100) may include a display panel (110), a data driver (120), a scan driver (130), a power management circuit (140), and a controller (150). A display panel (110) may include a plurality of data lines, a plurality of first scan lines, a plurality of second scan lines, and a plurality of pixels (PX). The data lines may provide data voltages (DV) to the pixels (PX). The first scan lines may provide first scan signals (S1) to the pixels (PX). The second scan lines may provide second scan signals (S2) to the pixels (PX). The pixels (PX) may emit light in response to the data voltages (DV), the first scan signals (S1), and the second scan signals (S2). The display panel (110) may further include a plurality of reference voltage lines. The reference voltage lines may provide a reference voltage to the pixels (PX). In one embodiment, the reference voltage lines may be used as sensing lines for sensing the characteristics of the pixels (PX). The data driver (120) can provide data voltages (DV) to pixels (PX) through data lines. The data driver (120) can generate data voltages (DV) based on a data control signal (DCTRL) and output image data (ODAT). In one embodiment, the data control signal (DCTRL) may include an output data enable signal, a horizontal start signal, and a load signal. In one embodiment, the data driver (120) can receive output image data (ODAT) at a driving frequency (DF) that varies within a predetermined