KR20240039979A - Display device, method of driving the same, and electronic device - Google Patents

Abstract

A display device includes a display panel including pixels, a gate driver that sequentially applies scan signals to pixel rows including pixels at a scan frequency, a data driver that applies data voltages to the pixels, and a power supply that applies a power voltage to the pixels. It may include a voltage generator and a timing controller that sets the ripple frequency of the power voltage to deviate from the scan frequency by more than a preset reference rate.

Description

Display device, driving method thereof, and electronic device {DISPLAY DEVICE, METHOD OF DRIVING THE SAME, AND ELECTRONIC DEVICE}

The present invention relates to a display device, a method of driving the same, and electronic equipment. More specifically, it relates to a display device that applies a power supply voltage to pixels, a method of driving the same, and an electronic device.

Typically, a display device includes a display panel, a gate driver, a data driver, and a timing controller. The display panel includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels electrically connected to the plurality of gate lines and the plurality of data lines. The gate driver provides gate signals to the gate lines, the data driver provides data voltages to the data lines, and the timing controller controls the gate driver and data driver.

The display device may further include a power voltage generator that generates a power voltage for driving the pixels. The power supply voltage generator may rectify the alternating current voltage to generate a power supply voltage that is a direct current voltage. However, even if the AC voltage is rectified, some AC components may remain as ripple voltage in the power supply voltage.

One object of the present invention is to provide a display device that reduces the luminance difference caused by ripple voltage.

Another object of the present invention is to provide a display device driving method for driving a display device.

Another object of the present invention is to provide an electronic device including a display module.

However, the problem to be solved by the present invention is not limited to the above-mentioned problem, and may be expanded in various ways without departing from the spirit and scope of the present invention.

In order to achieve an object of the present invention, a display device according to embodiments of the present invention includes a display panel including pixels, a gate driver that sequentially applies scan signals to pixel rows including the pixels at a scan frequency, and It includes a data driver that applies data voltages to pixels, a power voltage generator that applies a power voltage to the pixels, and a timing controller that sets the ripple frequency of the power voltage to deviate from the scan frequency by more than a preset reference rate. can do.

In one embodiment, the reference ratio is 5%.

In one embodiment, the timing controller may set the ripple frequency to deviate from an integer multiple of the scan frequency by more than the reference ratio.

In one embodiment, each of the pixels includes a scan transistor that writes the data voltages to a storage capacitor in response to the scan signals, receives the power voltage, and generates a driving current corresponding to the written data voltages. It may include a driving transistor that receives the driving current and a light-emitting element that emits light.

In one embodiment, each of the pixels includes a scan transistor for writing the data voltages to a storage capacitor in response to the scan signals, a driving transistor for generating a driving current corresponding to the written data voltages, and the power supply. It may include a light emitting element that receives voltage and emits light by receiving the driving current.

In one embodiment, the timing controller may vary the driving frequency of the display panel.

In one embodiment, the timing controller may set the ripple frequency to deviate from the scan frequency at the driving frequency of the current frame by more than the reference rate.

In one embodiment, the timing controller may set the ripple frequency to deviate from an integer multiple of the scan frequency at the driving frequency of the current frame by more than the reference ratio.

In one embodiment, the timing controller may set the driving frequency to one of the set frequencies and set the ripple frequency to deviate from the scan frequency at each of the set frequencies by more than the reference ratio.

In one embodiment, the timing controller may set the ripple frequency to deviate from an integer multiple of the scan frequency at each of the set frequencies by more than the reference ratio.

In order to achieve another object of the present invention, a method of driving a display device according to embodiments of the present invention sequentially applies scan signals to pixel rows at a scan frequency, and adjusts the ripple frequency of the power supply voltage to a preset value from the scan frequency. It is set to deviate from a reference ratio or more, and the power voltage can be applied to pixels included in the pixel rows.

In one embodiment, the reference rate may be 5%.

In one embodiment, the ripple frequency may be set to deviate from an integer multiple of the scan frequency by more than the reference ratio.

In one embodiment, each of the pixels includes a scan transistor that writes data voltages to a storage capacitor in response to the scan signals, receives the power voltage, and generates a driving current corresponding to the written data voltages. It may include a driving transistor and a light emitting element that receives the driving current and emits light.

In one embodiment, each of the pixels includes a scan transistor that writes data voltages to a storage capacitor in response to the scan signals, a driving transistor that generates a driving current corresponding to the written data voltages, and the power voltage. and may include a light-emitting element that receives the driving current and emits light.

In one embodiment, the method may further include varying the driving frequency of the display panel including the pixels.

In one embodiment, the ripple frequency may be set to deviate from the scan frequency at the driving frequency of the current frame by more than the reference rate.

In one embodiment, the ripple frequency may be set to deviate from an integer multiple of the scan frequency at the driving frequency of the current frame by more than the reference rate.

In one embodiment, the driving frequency is set to one of the set frequencies, the ripple frequency is set to deviate from the scan frequency at each of the set frequencies by more than the reference ratio, and the ripple frequency is set to one of the set frequencies. Each can be set to deviate from an integer multiple of the scan frequency by more than the reference ratio.

In order to achieve another object of the present invention, an electronic device according to embodiments of the present invention includes a display module including pixels, a main processor that outputs a synchronization signal to an auxiliary processor, and a power supply voltage applied to the pixels. It may include an auxiliary processor that sets the ripple frequency to deviate from the scan frequency set to be synchronized to the synchronization signal by more than a preset reference rate.

A display device according to embodiments of the present invention includes a display panel including pixels, a gate driver sequentially applying scan signals to pixel rows including pixels at a scan frequency, a data driver applying data voltages to pixels, and a pixel. By including a power supply voltage generator that applies the power voltage to the power supply voltage and a timing controller that sets the ripple frequency of the power supply voltage to deviate from the scan frequency by more than a preset reference rate, the luminance difference caused by the ripple voltage can be reduced. .

The method of driving a display device according to embodiments of the present invention can prevent a waterfall phenomenon by reducing the luminance difference caused by ripple voltage.

However, the effects of the present invention are not limited to the effects described above, and may be expanded in various ways without departing from the spirit and scope of the present invention.

1 is a block diagram showing a display device according to embodiments of the present invention.
FIG. 2 is a circuit diagram illustrating an example of a pixel of the display device of FIG. 1 .
FIG. 3 is a diagram illustrating an example of the first power supply voltage of the display device of FIG. 1 .
FIG. 4 is a timing diagram illustrating an example of scan signals of the display device of FIG. 1 .
Figure 5 is a timing diagram showing the first power voltage and scan signals according to a comparative example.
Figure 6 is a table showing the degree to which the waterfall phenomenon is recognized according to the ripple frequency.
FIG. 7 is a table showing an example of how the display device of FIG. 1 sets the ripple frequency.
Figure 8 is a table showing the degree to which the waterfall phenomenon is recognized according to the ripple frequency.
Figure 9 is a table showing an example of setting a ripple frequency in a display device according to embodiments of the present invention.
Figure 10 is a table showing an example of setting a ripple frequency in a display device according to embodiments of the present invention.
11 is a flowchart showing a method of driving a display device according to embodiments of the present invention.
Figure 12 is a block diagram showing an electronic device according to embodiments of the present invention.
FIG. 13 is a diagram illustrating an example in which the electronic device of FIG. 12 is implemented as a television.

Hereinafter, the present invention will be described in more detail with reference to the attached drawings.

1 is a block diagram showing a display device according to embodiments of the present invention.

Referring to FIG. 1 , the display device may include a display panel 100, a timing controller 200, a gate driver 300, a data driver 400, and a power voltage generator 500. In one embodiment, the timing controller 200 and data driver 400 may be integrated on one chip.

The display panel 100 may include a display area (AA) that displays an image and a peripheral area (PA) disposed adjacent to the display area (AA). In one embodiment, the gate driver 300 may be mounted in the peripheral area (PA).

The display panel 100 includes a plurality of gate lines GL, a plurality of data lines DL, and a plurality of pixels P electrically connected to the gate lines GL and the data lines DL. can do. The gate lines GL may extend in the first direction D1, and the data lines DL may extend in the second direction D2 that intersects the first direction D1.

The timing controller 200 may receive input image data (IMG) and input control signal (CONT) from a main processor (eg, graphic processing unit (GPU), etc.). For example, the input image data (IMG) may include red image data, green image data, and blue image data. In one embodiment, the input image data (IMG) may further include white image data. For another example, the input image data (IMG) may include magenta image data, yellow image data, and cyan image data. The input control signal (CONT) may include a master clock signal and a data enable signal. The input control signal CONT may further include a vertical synchronization signal and a horizontal synchronization signal.

For example, the driving frequency described later may be set to be synchronized to the vertical synchronization signal. For example, the scan frequency described later can be set to be synchronized to the horizontal synchronization signal.

The timing controller 200 generates a first control signal (CONT1), a second control signal (CONT2), a third control signal (CONT3), and a data signal (CONT3) based on the input image data (IMG) and the input control signal (CONT). DATA) can be created.

The timing controller 200 may generate a first control signal CONT1 for controlling the operation of the gate driver 300 based on the input control signal CONT and output the first control signal CONT1 to the gate driver 300. The first control signal CONT1 may include a vertical start signal and a gate clock signal.

The timing controller 200 may generate a second control signal CONT2 for controlling the operation of the data driver 400 based on the input control signal CONT and output the second control signal CONT2 to the data driver 400. The second control signal CONT2 may include a horizontal start signal and a load signal.

The timing controller 200 may receive input image data (IMG) and an input control signal (CONT) and generate a data signal (DATA). The timing controller 200 may output a data signal (DATA) to the data driver 400.

The timing controller 200 may generate a third control signal (CONT3) for controlling the operation of the power supply voltage generator 500 based on the input control signal (CONT) and output the third control signal (CONT3) to the power supply voltage generator 500. . The third control signal CONT3 may include a signal for the ripple frequency.

The gate driver 300 may generate gate signals for driving the gate lines GL in response to the first control signal CONT1 received from the timing controller 200. The gate driver 300 may output gate signals to gate lines GL. For example, the gate driver 300 may sequentially output gate signals to the gate lines GL.

The data driver 400 may receive a second control signal (CONT2) and a data signal (DATA) from the timing controller 200. The data driver 400 may generate data voltages obtained by converting the data signal DATA into an analog voltage. The data driver 400 may output data voltages to the data line DL.

The power voltage generator 500 may receive a third control signal CONT3 from the timing controller 200. The power voltage generator 500 may generate power voltages ELVDD and ELVSS for driving the pixels P. The power voltage generator 500 may output power voltages (ELVDD and ELVSS) to the display panel 100.

FIG. 2 is a circuit diagram illustrating an example of a pixel P of the display device of FIG. 1 .

Referring to FIG. 2, each of the pixels P has a scan transistor ST that writes data voltages VDATA to the storage capacitor CST in response to the scan signals SC, and a first power supply voltage ELVDD. A driving transistor (DT) that receives (e.g., a high power supply voltage) and generates a driving current corresponding to the written data voltages (VDATA), and a second power supply voltage (ELVSS) (e.g., a low power supply voltage) It may include a light emitting element (EE) that receives a voltage) and emits light by receiving a driving current.

For example, each of the pixels P includes a control electrode receiving the scan signal SC, a first electrode receiving the data voltage VDATA, and a second electrode connected to the first node N1. A driving transistor (DT) including a transistor (ST), a control electrode connected to the first node (N1), a first electrode receiving the first power voltage (ELVDD), and a second electrode connected to the second node (N2) , a storage capacitor (CST) including a first electrode connected to the first node (N1) and a second electrode connected to the second node (N2), and a first electrode and a second power supply voltage connected to the second node (N2) It may include a light emitting element (EE) including a second electrode that receives (ELVSS).

In this embodiment, each of the pixels P is illustrated as having a 2T1C structure consisting of two transistors and one capacitor, but the present invention is not limited to this. For example, each of the pixels P has a 3T1C structure consisting of three transistors and one capacitor, a 5T2C structure consisting of five transistors and two capacitors, and a 7T1C structure consisting of seven transistors and one capacitor. , it can have various structures such as 9T1C, which consists of 9 transistors and 1 capacitor.

The scan transistor (ST) and driving transistor (DT) may be implemented as a p-channel metal oxide semiconductor (PMOS) transistor. In this case, the low voltage level may be an activation level, and the high voltage level may be a deactivation level. For example, when a signal applied to the control electrode of the PMOS transistor has a low voltage level, the PMOS transistor may be turned on. For example, when a signal applied to the control electrode of the PMOS transistor has a high voltage level, the PMOS transistor may be turned off.

However, the present invention is not limited to this. For example, the scan transistor (ST) and driving transistor (DT) may be implemented as an n-channel metal oxide semiconductor (NMOS) transistor.

For example, in the initialization period, the scan signal SC has an activation level and the scan transistor ST may be turned on. Accordingly, an initialization voltage may be applied to the first node N1 (i.e., a gate initialization operation). That is, the control electrode of the driving transistor DT (i.e., the data voltage VDATA written to the storage capacitor CST) may be initialized.

For example, in a data writing period, the scan signal SC has an activation level and the scan transistor ST may be turned on. Accordingly, the data voltage VDATA may be written to the storage capacitor CST (i.e., a data write operation).

For example, in the light emission period, the scan signal SC has an inactivation level and the scan transistor ST may be turned off. Accordingly, the driving transistor DT generates a driving current, and the driving current can be applied to the light-emitting element EE (i.e., light-emitting operation). That is, the light emitting element EE can emit light with a luminance corresponding to the driving current.

FIG. 3 is a diagram illustrating an example of the first power voltage ELVDD of the display device of FIG. 1 .

Referring to FIGS. 1 and 3 , the power supply voltage generator 500 may generate the first power voltage ELVDD by rectifying the alternating current voltage. However, even if the AC voltage is rectified, some AC component may remain as a ripple voltage (VR) in the first power voltage (ELVDD). Accordingly, the first power voltage (ELVDD) may be the sum of the direct current voltage (VDC) and the ripple voltage (VR).

The ripple frequency may be the frequency of the ripple voltage (VR). Since the first power voltage ELVDD is the sum of a direct current voltage (VDC) and a ripple voltage (VR) having a constant voltage value, the first power voltage (ELVDD) may be applied to the pixels (P) at a ripple frequency.

The power supply voltage generator 500 may generate a second power voltage (ELVSS) by rectifying the alternating current voltage. Like the first power voltage ELVDD, the second power voltage ELVSS may have some alternating current components remaining as ripple voltage VR.

FIG. 4 is a timing diagram illustrating an example of scan signals SC of the display device of FIG. 1 .

1 and 4, the gate driver 300 receives scan signals (SC[1], SC[2], SC[3], SC[4], ..., SC[N-1], SC[N]) can be sequentially applied to pixel rows including pixels P at a scan frequency.

For example, the gate driver 300 sends scan signals (SC[1], SC[2], SC[3], SC[4], ..., SC to one pixel row every 1 horizontal time (1H). [N-1], SC[N]) can be approved. That is, the number of times one horizontal time (1H) is repeated per second may be equal to the scan frequency.

As described above, data voltages are generated at pixels in response to scan signals (SC[1], SC[2], SC[3], SC[4], ..., SC[N-1], SC[N]). It can be written in (P). Accordingly, data voltages can be written to the pixels (P) of one pixel row every one horizontal time (1H).

In this embodiment, the gate driver 300 sends scan signals (SC[1], SC[2], SC[3], SC[4], ..., to one pixel row every 1 horizontal time (1H). Although SC[N-1] and SC[N]) are exemplified, the present invention is not limited thereto. For example, the gate driver 300 sends scan signals (SC[1], SC[2], SC[3], SC[4]) to N pixel rows (N is a positive integer of 2 or more) every 1 horizontal time. , ..., SC[N-1], SC[N]) can be authorized.

5 shows the first power voltage (ELVDD) and scan signals (SC[1], SC[2], SC[3], SC[4], SC[5], SC[6], and SC according to a comparative example). [7]), and Figure 6 is a table showing the degree to which the waterfall phenomenon is recognized according to the ripple frequency (RF).

In Figure 6, the unit of ripple frequency (RF) is kilohertz (kHz), and the degree to which the waterfall phenomenon is recognized is divided into STRONG, MEDIUM, WEAK, and NOTHING. The degree to which the waterfall phenomenon is recognized is strong in the order of STRONG, MEDIUM, WEAK, and NOTHING, with NOTHING indicating that the waterfall phenomenon is not recognized.

Here, the waterfall phenomenon may be a phenomenon in which a horizontal line is visible due to a difference in luminance between pixel rows.

Referring to FIGS. 1 and 5 , when data voltages are written to each pixel row, the voltage of the first power voltage ELVDD applied to the pixels P may vary. Also, as the voltage difference between the first power voltages ELVDD increases, the luminance difference between pixel rows may increase.

For example, in Figure 5, when data voltages are written to the first pixel row (i.e., when the scan signal (SC[1]) applied to the first pixel row has an activation level) and to the fifth pixel row When data voltages are written (that is, when the scan signal SC[5] applied to the fifth pixel row has an activation level), the voltage difference between the first power voltage ELVDD may be maximum. Accordingly, in Figure 4, the luminance difference between the first and fifth pixel rows may be maximized.

In this way, a luminance difference occurs between pixel rows, and the luminance difference may cause a waterfall phenomenon.

In the comparative example of FIG. 5, the luminance difference caused by the ripple frequency of the first power supply voltage (ELVDD) has been described, but the luminance difference may also occur due to the ripple frequency of the second power voltage (ELVSS).

Referring to Figures 1 and 6, the waterfall phenomenon, like a beat phenomenon, can be seen more strongly as the scan frequency (SF) and ripple frequency (RF) are similar. In addition, the waterfall phenomenon, like the beating phenomenon, can be more strongly recognized as the integer multiple of the scan frequency (SF) and the ripple frequency are similar.

For example, when the driving frequency (DF) of the display panel 100 is 60 Hz, the scan frequency (SF) may be 97.1 kHz. Integer multiples of the scan frequency (SF) may be 97.1 kHz, 194.2 kHz, and 291.3 kHz. As shown in Figure 6, the waterfall phenomenon can be strongly visible when the ripple frequency (RF) is 185 kHz, 195 kHz, and 295 kHz. In other words, the waterfall phenomenon can be strongly visible at 185 kHz and 195 kHz, which are close to twice the scan frequency (SF), and at 295 kHz, which is close to three times the scan frequency (SF).

Therefore, in order to prevent the waterfall phenomenon, the display device can set the ripple frequency (RF) to deviate from the scan frequency (SF) by a certain range or more.

FIG. 7 is a table showing an example of how the display device of FIG. 1 sets the ripple frequency (RF).

Referring to FIGS. 1 and 7 , the timing controller 200 may set the ripple frequency (RF) of the power supply voltages (ELVDD and ELVSS) to deviate from the scan frequency (SF) by a preset reference rate or more. The timing controller 200 may set the ripple frequency (RF) to deviate from an integer multiple of the scan frequency (SF) by more than a reference rate.

For example, the base rate may be 5%. When the driving frequency (DF) of the display panel 100 is 60 Hz, the scan frequency (SF) may be 97.1 kHz. Integer multiples of the scan frequency (SF) may be 97.1 kHz, 194.2 kHz, and 291.3 kHz. The ±5% range of 97.1 kHz can be approximately 92.2 to 102 kHz. The ±5% range of 194.2kHz may be approximately 184.5 to 205 kHz. The ±5% range of 291.3 kHz can be approximately 276.6 to 305.8 kHz. Accordingly, the ripple frequency (RF) can be set to one of the frequencies outside 92.2 to 102 kHz, 184.5 to 205 kHz, and 276.6 to 305.8 kHz.

In this embodiment, only 1, 2, and 3 times the scan frequency (SF) are exemplified, but the present invention is not limited thereto.

In one embodiment, the timing controller 200 may set the ripple frequency (RF) of the first power voltage (ELVDD) or the second power voltage (ELVSS). In another embodiment, the timing controller 200 may set both the ripple frequencies (RF) of the first power voltage (ELVDD) and the second power voltage (ELVSS). That is, in order to prevent the waterfall phenomenon, the display device adjusts only the ripple frequency (RF) of the first power supply voltage (ELVDD), only the ripple frequency (RF) of the second power supply voltage (ELVSS), or adjusts only the ripple frequency (RF) of the first power supply voltage (ELVDD). Both the voltage (ELVDD) and the ripple frequency (RF) of the second power supply voltage (ELVSS) can be adjusted.

FIG. 8 is a table showing the degree to which the waterfall phenomenon is recognized according to the ripple frequency (RF), and FIG. 9 shows an example of how the display device according to embodiments of the present invention sets the ripple frequency (RF). This table represents

The display device according to the present embodiments is substantially the same as the configuration of the display device in FIG. 1 except that the driving frequency (DF) and ripple frequency (RF) are variable, so the same or similar components are denoted by the same reference numerals. and reference symbols are used, and overlapping descriptions are omitted.

In Figures 8 and 9, the unit of ripple frequency (RF) is kilohertz (kHz), and the degree to which the waterfall phenomenon is recognized is divided into STRONG, MEDIUM, WEAK, and NOTHING. The degree to which the waterfall phenomenon is recognized is strong in the order of STRONG, MEDIUM, WEAK, and NOTHING, with NOTHING indicating that the waterfall phenomenon is not recognized.

Referring to FIGS. 1, 2, 8, and 9, the timing controller 200 may vary the driving frequency DF of the display panel 100. For example, the timing controller 200 may set the driving frequency DF to one of the set frequencies. For example, the timing controller 200 may set the driving frequency (DF) to one of 60Hz, 120Hz, and 175Hz.

In this embodiment, the set frequencies are 60Hz, 120Hz, and 175Hz, but the present invention is not limited thereto.

The timing controller 200 may set the ripple frequency (RF) to deviate from the scan frequency (SF) at the driving frequency (DF) of the current frame by more than a reference rate. The timing controller 200 may set the ripple frequency (RF) to deviate from an integer multiple of the scan frequency (SF) at the driving frequency (DF) of the current frame by more than a reference rate.

Since the scan signals SC are sequentially applied to pixel rows at the scan frequency SF, if the driving frequency DF of the display panel 100 changes, the scan frequency SF may also change. As the scan frequency (SF) varies, the ripple frequency (RF) at which the waterfall phenomenon is recognized may also vary. Accordingly, the display device can set the ripple frequency (RF) according to the driving frequency (DF) of the current frame.

For example, the base rate may be 5%. If the driving frequency (DF) of the current frame is 60Hz, the scan frequency (SF) may be 97.1kHz. Integer multiples of the scan frequency (SF) may be 97.1 kHz, 194.2 kHz, and 291.3 kHz. The ±5% range of 97.1 kHz can be approximately 92.2 to 102 kHz. The ±5% range of 194.2kHz may be approximately 184.5 to 205 kHz. The ±5% range of 291.3 kHz can be approximately 276.6 to 305.8 kHz. Accordingly, the ripple frequency (RF) can be set to one of the frequencies outside 92.2 to 102 kHz, 184.5 to 205 kHz, and 276.6 to 305.8 kHz.

For example, the base rate may be 5%. If the driving frequency (DF) of the current frame is 120Hz, the scan frequency (SF) may be 194.2kHz. Integer multiples of the scan frequency (SF) may be 194.2kHz, 388.4kHz, or 582.6kHz. The ±5% range of 194.2kHz may be approximately 184.5 to 205 kHz. The ±5% range of 388.4kHz could be approximately 369~407.8kHz. The ±5% range of 582.6 kHz may be approximately 553.5 to 611.7 kHz. Accordingly, the ripple frequency (RF) can be set to one of the frequencies outside of 184.5-205 kHz, 369-407.8 kHz, and 553.5-611.7 kHz.

For example, the base rate may be 5%. If the driving frequency (DF) of the current frame is 175Hz, the scan frequency (SF) may be 283.3kHz. Integer multiples of the scan frequency (SF) may be 283.3 kHz, 566.6 kHz, or 849.9 kHz. The ±5% range of 283.3 kHz can be approximately 269.1 to 297.5 kHz. The ±5% range of 566.6 kHz could be approximately 538.3 to 594.9 kHz. The ±5% range of 849.9kHz may be approximately 807.4 to 892.4kHz. Accordingly, the ripple frequency (RF) can be set to one of the frequencies outside 269.1 to 297.5 kHz, 538.3 to 594.9 kHz, and 807.4 to 892.4 kHz.

That is, the ripple frequency (RF) may change as the driving frequency (DF) varies.

In this embodiment, only 1, 2, and 3 times the scan frequency (SF) are exemplified, but the present invention is not limited thereto.

FIG. 10 is a table showing an example of how a display device sets a ripple frequency (RF) according to embodiments of the present invention.

The display device according to the present embodiments is substantially the same as the configuration of the display device of FIG. 9, except that the ripple frequency (RF) does not change when the driving frequency (DF) changes, so the same or similar components have the same configuration. Reference numbers and reference symbols are used, and redundant descriptions are omitted.

In Figure 10, the unit of ripple frequency (RF) is kilohertz (kHz), and the degree to which the waterfall phenomenon is recognized is divided into STRONG, MEDIUM, WEAK, and NOTHING. The degree to which the waterfall phenomenon is recognized is strong in the order of STRONG, MEDIUM, WEAK, and NOTHING, with NOTHING indicating that the waterfall phenomenon is not recognized.

Referring to FIGS. 1 , 2 , and 10 , the timing controller 200 may vary the driving frequency DF of the display panel 100 . For example, the timing controller 200 may set the driving frequency DF to one of the set frequencies. For example, the timing controller 200 may set the driving frequency (DF) to one of 60Hz, 120Hz, and 175Hz.

In this embodiment, the set frequencies are 60Hz, 120Hz, and 175Hz, but the present invention is not limited thereto.

The timing controller 200 may set the ripple frequency (RF) to deviate from the scan frequency (SF) at each set frequency by more than a reference rate. The timing controller 200 may set the ripple frequency (RF) to deviate from an integer multiple of the scan frequency (SF) at each set frequency by more than a reference rate.

Since the scan signals SC are sequentially applied to pixel rows at the scan frequency SF, if the driving frequency DF of the display panel 100 changes, the scan frequency SF may also change. As the scan frequency (SF) varies, the ripple frequency (RF) at which the waterfall phenomenon is recognized may also vary. Accordingly, the display device can set the ripple frequency (RF) by considering all frequencies (i.e., set frequencies) that can be the driving frequency (DF).

For example, the base rate may be 5%. If the set frequencies are 60Hz, 120Hz, and 175Hz, the scan frequency (SF) can be 97.1kHz, 194.2kHz, and 283.3kHz. Frequencies that can be integer multiples of the scan frequency (SF) can be 97.1kHz, 194.2kHz, 283.3kHz, 291.3kHz, 388.4kHz, 566.6kHz, 582.6kHz, and 849.9kHz. The ±5% range of 97.1 kHz can be approximately 92.2 to 102 kHz. The ±5% range of 194.2kHz may be approximately 184.5 to 205 kHz. The ±5% range of 283.3 kHz can be approximately 269.1 to 297.5 kHz. The ±5% range of 291.3 kHz can be approximately 276.6 to 305.8 kHz. The ±5% range of 388.4kHz could be approximately 369~407.8kHz. The ±5% range of 566.6 kHz could be approximately 538.3 to 594.9 kHz. The ±5% range of 582.6 kHz may be approximately 553.5 to 611.7 kHz. The ±5% range of 849.9kHz may be approximately 807.4 to 892.4kHz. Therefore, the ripple frequency (RF) is outside of 92.2 to 102 kHz, 184.5 to 205 kHz, 269.1 to 297.5 kHz, 276.6 to 305.8 kHz, 369 to 407.8 kHz, 538.3 to 594.9 kHz, 553.5 to 611.7 kHz, and 807.4 to 892.4 kHz. frequencies It can be set to one of:

That is, the ripple frequency (RF) may not change as the driving frequency (DF) varies.

In this embodiment, only 1, 2, and 3 times the scan frequency (SF) are exemplified, but the present invention is not limited thereto.

11 is a flowchart showing a method of driving a display device according to embodiments of the present invention.

Referring to FIG. 11, the method of driving the display device of FIG. 11 sequentially applies scan signals to pixel rows at a scan frequency (S100), and sets the ripple frequency of the power supply voltage to deviate from the scan frequency by more than a preset reference ratio (S100). S200), and the power supply voltage may be applied to pixels included in the pixel rows (S300).

The display device according to the display device driving method of FIG. 11 may receive input image data and input control signals from the main processor. The input control signal may include a vertical synchronization signal and a horizontal synchronization signal.

For example, the driving frequency described later may be set to be synchronized to the vertical synchronization signal. For example, the scan frequency described later can be set to be synchronized to the horizontal synchronization signal.

Specifically, the method of driving the display device of FIG. 11 may sequentially apply scan signals to pixel rows at a scan frequency (S100). Data voltages may be written to pixels in response to scan signals.

For example, each of the pixels includes a scan transistor that writes data voltages to a storage capacitor in response to scan signals, a drive transistor that receives a first power voltage and generates a drive current corresponding to the written data voltages, and It may include a light emitting element that receives a second power voltage and a driving current to emit light.

Specifically, the method of driving the display device of FIG. 11 may set the ripple frequency of the power supply voltage to deviate from the scan frequency by more than a preset reference rate (S200). The ripple frequency may be set to deviate from an integer multiple of the scan frequency by more than a standard ratio. For example, the base rate may be 5%.

In one embodiment, the method of driving the display device of FIG. 11 may vary the driving frequency of the display panel including pixels. For example, the driving frequency may be set to one of the set frequencies.

In one embodiment, the ripple frequency may be set to deviate from the scan frequency at the driving frequency of the current frame by more than a reference rate. The ripple frequency may be set to deviate from an integer multiple of the scan frequency at the driving frequency of the current frame by more than a reference rate. That is, the ripple frequency may change as the driving frequency varies.

In one embodiment, the ripple frequency may be set to deviate from the scan frequency at each of the set frequencies by more than a reference rate. The ripple frequency may be set to deviate from an integer multiple of the scan frequency by a reference rate or more at each of the set frequencies. That is, the ripple frequency may not change as the driving frequency varies.

In the present embodiments, sequential scanning of pixel rows is illustrated, but the present invention is not limited thereto. For example, scan signals can be applied sequentially to pixel columns at the scan frequency. In this case, the display device according to embodiments of the present invention can prevent the waterfall phenomenon in which vertical lines are visible.

Additionally, in the present embodiments, it is exemplified that the ripple frequency of the power supply voltage is set by the timing controller, but the present invention is not limited thereto.

FIG. 12 is a block diagram showing an electronic device according to embodiments of the present invention, and FIG. 13 is a diagram showing an example of the electronic device of FIG. 12 implemented as a television.

Referring to Figures 12 and 13,

The electronic device 1000 outputs various information through the display module 1400 within the operating system. When the processor 1100 executes an application stored in the memory 1200, the display module 1400 provides application information to the user through the display panel 1410. At this time, the display panel 1410 may be the display panel of FIG. 1 .

The processor 1100 obtains an external input through the input module 1300 or the sensor module 1610 and executes an application corresponding to the external input. For example, when the user selects the camera icon displayed on the display panel 1410, the processor 1100 obtains the user input through the input sensor 1610-2 and activates the camera module 1710. The processor 1100 transmits a data signal corresponding to the captured image acquired through the camera module 1710 to the display module 1400. The display module 1400 may display an image corresponding to the captured image through the display panel 1410.

As another example, when personal information authentication is performed in the display module 1400, the fingerprint sensor 1610-1 obtains input fingerprint information as input data. The processor 1100 compares the input data obtained through the fingerprint sensor 1610-1 with the authentication data stored in the memory 1200, and executes the application according to the comparison result. The display module 1400 may display information executed according to the logic of the application through the display panel 1410.

As another example, when the music streaming icon displayed on the display module 1400 is selected, the processor 1100 obtains user input through the input sensor 1610-2 and activates the music streaming application stored in the memory 1200. . When a music play command is input from a music streaming application, the processor 1100 activates the sound output module 1630 to provide sound information corresponding to the music play command to the user.

In the above, the operation of the electronic device 1000 has been briefly described. Below, the configuration of the electronic device 1000 will be described in detail. Some of the components of the electronic device 1000, which will be described later, may be integrated and provided as one component, or one component may be provided separately into two or more components.

The electronic device 1000 may communicate with an external electronic device 2000 through a network (eg, a short-range wireless communication network or a long-distance wireless communication network). According to one embodiment, the electronic device 1000 includes a processor 1100, a memory 1200, an input module 1300, a display module 1400, a power module 1500, a built-in module 1600, and an external module ( 1700). According to one embodiment, the electronic device 1000 may omit at least one of the above-described components or add one or more other components. According to one embodiment, some of the above-described components (e.g., sensor module 1610, antenna module 1620, or sound output module 1630) are connected to another component (e.g., display It may be integrated into module 1400).

The processor 1100 executes software to control at least one other component (e.g., hardware or software component) of the electronic device 1000 connected to the processor 1100, and performs various data processing or calculations. can do. According to one embodiment, as at least part of data processing or computation, the processor 1100 may use commands or data received from another component (e.g., input module 1300, sensor module 1610, or communication module 1730). may be stored in the volatile memory 1210, the command or data stored in the volatile memory 1210 may be processed, and the resulting data may be stored in the non-volatile memory 1220.

The processor 1100 may include a main processor 1110 and an auxiliary processor 1120. The main processor 1110 may include one or more of a central processing unit (CPU) 1110-1 or an application processor (AP). The main processor 1110 may further include one or more of a graphics processing unit (1110-2, GPU: graphic processing unit), a communication processor (CP), and an image signal processor (ISP). there is. The main processor 1110 may further include a neural network processing unit (NPU) 1110-3 (neural processing unit). A neural network processing unit is a processor specialized in processing artificial intelligence models, and artificial intelligence models can be created through machine learning. An artificial intelligence model may include multiple artificial neural network layers. Artificial neural networks include deep neural network (DNN), convolutional neural network (CNN), recurrent neural network (RNN), restricted boltzmann machine (RBM), belief deep network (DBN), bidirectional recurrent deep neural network (BRDNN), It may be one of deep Q-networks or a combination of two or more of the above, but is not limited to the examples described above. In addition to hardware structures, artificial intelligence models may additionally or alternatively include software structures. At least two of the above-described processing unit and processor may be implemented as an integrated configuration (eg, a single chip), or each may be implemented as an independent configuration (eg, a plurality of chips).

The coprocessor 1120 may include a controller 1120-1. The controller 1120-1 may include an interface conversion circuit and a timing control circuit. The controller 1120-1 receives input image data from the main processor 1110, converts the data format of the input image data to match the interface specifications with the display module 1400, and outputs a data signal. The controller 1120-1 may output various control signals necessary for driving the display module 1400.

The auxiliary processor 1120 may further include a data conversion circuit 1120-2, a gamma correction circuit 1120-3, a rendering circuit 1120-4, etc. The data conversion circuit 1120-2 receives a data signal from the controller 1120-1, and compensates the data signal to display the image at a desired brightness according to the characteristics of the electronic device 1000 or the user's settings, or power consumption. The data signal can be converted to reduce or compensate for afterimages. The gamma correction circuit 1120-3 may convert a data signal or a gamma reference voltage so that an image displayed on the electronic device 1000 has desired gamma characteristics. The rendering circuit 1120-4 may receive a data signal from the controller 1120-1 and render the data signal by considering the pixel arrangement of the display panel 1410 applied to the electronic device 1000. At least one of the data conversion circuit 1120-2, the gamma correction circuit 1120-3, and the rendering circuit 1120-4 is integrated into another component (e.g., the main processor 1110 or the controller 1120-1). It can be.

At least one of the controller 1120-1, the data conversion circuit 1120-2, the gamma correction circuit 1120-3, and the rendering circuit 1120-4 may be integrated into a data driver 1430 to be described later.

At this time, the auxiliary processor 1120 may be the timing controller of FIG. 1.

The memory 1200 stores various data used by at least one component of the electronic device 1000 (e.g., the processor 1100 or the sensor module 1610) and input data or output data for commands related thereto. You can. The memory 1200 may include at least one of a volatile memory 1210 and a non-volatile memory 1220.

The input module 1300 transmits commands or data to be used in components of the electronic device 1000 (e.g., the processor 1100, the sensor module 1610, or the audio output module 1630) to the outside of the electronic device 1000 (e.g., , can be received from the user or an external electronic device (2000).

The input module 1300 may include a first input module 1310 through which a command or data is input from a user, and a second input module 1320 through which a command or data is input from the external electronic device 2000. The first input module 1310 may include a microphone, mouse, keyboard, keys (eg, buttons), or pen (eg, passive pen or active pen). The second input module 1320 may support a designated protocol that can connect to the external electronic device 2000 by wire or wirelessly. According to one embodiment, the second input module 1320 may include a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface. The second input module 1320 may include a connector that can be physically connected to the external electronic device 2000, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector). there is.

The display module 1400 visually provides information to the user. The display module 1400 may include a display panel 1410, a gate driver 1420, and a data driver 1430. The display module 1400 may further include a window, a chassis, and a bracket to protect the display panel 1410. At this time, the gate driver 1420 and data driver 1430 may be the gate driver and data driver of FIG. 1.

The display panel 1410 may include a liquid crystal display panel, an organic light emitting display panel, or an inorganic light emitting display panel, and the type of the display panel 1410 is not particularly limited. The display panel 1410 may be a rigid type or a flexible type capable of rolling or folding. The display module 1400 may further include a supporter, a bracket, or a heat dissipation member that supports the display panel 1410.

The gate driver 1420 may be mounted on the display panel 1410 as a driving chip. Additionally, the gate driver 1420 may be integrated into the display panel 1410. For example, the gate driver 1420 includes an Amorphous Silicon TFT Gate driver circuit (ASG), a Low Temperature Polycrystaline Silicon (LTPS) TFT Gate driver circuit, or an Oxide Semiconductor TFT Gate driver circuit (OSG) internalized in the display panel 1410. can do. The gate driver 1420 receives a control signal from the controller 1120-1 and outputs gate signals to the display panel 1410 in response to the control signal.

The display panel 1410 may further include an emission driver. The emission driver outputs an emission signal to the display panel 1410 in response to the control signal received from the controller 1120-1. The emission driver may be formed separately from the gate driver 1420 or may be integrated into the gate driver 1420.

The data driver 1430 receives a control signal from the controller 1120-1, converts the data signal into an analog voltage (e.g., data voltage) in response to the control signal, and then outputs the data voltages to the display panel 1410. .

Data driver 1430 may be integrated into other components (e.g., controller 1120-1). The functions of the interface conversion circuit and timing control circuit of the controller 1120-1 described above may be integrated into the data driver 1430.

The display module 1400 may further include a light emitting driver and a voltage generation circuit. The voltage generator circuit can output various voltages necessary to drive the display panel 1410.

The power module 1500 supplies power to components of the electronic device 1000. The power module 1500 may include a battery that charges power voltage. The battery may include a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell. The power module 1500 may include a power management integrated circuit (PMIC). The PMIC supplies optimized power to each of the above-described modules and the modules described below. The power module 1500 may include a wireless power transmission/reception member electrically connected to a battery. The wireless power transmission/reception member may include a plurality of coil-shaped antenna radiators.

The electronic device 1000 may further include a built-in module 1600 and an external module 1700. The embedded module 1600 may include a sensor module 1610, an antenna module 1620, and an audio output module 1630. The external module 1700 may include a camera module 1710, a light module 1720, and a communication module 1730.

The sensor module 1610 may detect an input by the user's body or an input by the pen of the first input module 1310, and generate an electrical signal or data value corresponding to the input. The sensor module 1610 may include at least one of a fingerprint sensor 1610-1, an input sensor 1610-2, and a digitizer 1610-3.

The fingerprint sensor 1610-1 may generate a data value corresponding to the user's fingerprint. The fingerprint sensor 1610-1 may include either an optical or capacitive fingerprint sensor.

The input sensor 1610-2 may generate data values corresponding to coordinate information of input by the user's body or pen. The input sensor 1610-2 generates the amount of change in capacitance caused by the input as a data value. The input sensor 1610-2 can detect input by a passive pen or transmit and receive data with an active pen.

The input sensor 1610-2 may measure biological signals such as blood pressure, moisture, or body fat. For example, when a user touches a part of the body to the sensor layer or a sensing panel and does not move for a certain period of time, the input sensor 1610-2 detects the biological signal based on the change in the electric field caused by the body part. Information desired by the user can be output to the display module 1400.

The digitizer 1610-3 may generate data values corresponding to coordinate information of input by a pen. The digitizer 1610-3 generates the amount of electromagnetic change caused by the input as a data value. The digitizer 1610-3 can detect input by a passive pen or transmit and receive data with an active pen.

At least one of the fingerprint sensor 1610-1, the input sensor 1610-2, and the digitizer 1610-3 may be implemented as a sensor layer formed on the display panel 1410 through a continuous process. The fingerprint sensor 1610-1, the input sensor 1610-2, and the digitizer 1610-3 may be disposed on the upper side of the display panel 1410, and the fingerprint sensor 1610-1, the input sensor 1610- 2), and the digitizer 1610-3, for example, the digitizer 1610-3 may be disposed below the display panel 1410.

At least two of the fingerprint sensor 1610-1, the input sensor 1610-2, and the digitizer 1610-3 may be formed to be integrated into one sensing panel through the same process. When integrated into one sensing panel, the sensing panel may be placed between the display panel 1410 and a window disposed above the display panel 1410. According to one embodiment, the sensing panel may be placed on a window, and the position of the sensing panel is not particularly limited.

At least one of the fingerprint sensor 1610-1, the input sensor 1610-2, and the digitizer 1610-3 may be built into the display panel 1410. That is, through a process of forming elements (e.g., light emitting elements, transistors, etc.) included in the display panel 1410, the fingerprint sensor 1610-1, the input sensor 1610-2, and the digitizer 1610- 3) At least one of them can be formed simultaneously.

Additionally, the sensor module 1610 may generate an electrical signal or data value corresponding to the internal state or external state of the electronic device 1000. The sensor module 1610 may be, for example, a gesture sensor, gyro sensor, barometric pressure sensor, magnetic sensor, acceleration sensor, grip sensor, proximity sensor, color sensor, IR (infrared) sensor, biometric sensor, temperature sensor, humidity sensor, or illuminance sensor. Additional sensors may be included.

The antenna module 1620 may include one or more antennas for transmitting or receiving signals or power from the outside. According to one embodiment, the communication module 1730 may transmit a signal to or receive a signal from an external electronic device through an antenna suitable for the communication method. The antenna pattern of the antenna module 1620 may be integrated into one component of the display module 1400 (eg, the display panel 1410) or the input sensor 1610-2.

The sound output module 1630 is a device for outputting sound signals to the outside of the electronic device 1000. For example, the sound output module 1630 includes a speaker used for general purposes such as multimedia playback or recording playback, and a receiver used exclusively for phone reception. It can be included. According to one embodiment, the receiver may be formed integrally with the speaker or separately. The sound output pattern of the sound output module 1630 may be integrated into the display module 1400.

The camera module 1710 can capture still images and moving images. According to one embodiment, the camera module 1710 may include one or more lenses, an image sensor, or an image signal processor. The camera module 1710 may further include an infrared camera capable of measuring the presence or absence of the user, the user's location, and the user's gaze.

The light module 1720 may provide light. The light module 1720 may include a light emitting diode or a xenon lamp. The light module 1720 may operate in conjunction with the camera module 1710 or operate independently.

The communication module 1730 may support establishing a wired or wireless communication channel between the electronic device 1000 and an external electronic device 2000, and performing communication through the established communication channel. The communication module 1730 is one of a wireless communication module such as a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module, and a wired communication module such as a local area network (LAN) communication module or a power line communication module. It can include one or all of them. The communication module 1730 communicates with the external electronic device 2000 through a short-range communication network such as Bluetooth, WiFi direct, or infrared data association (IrDA), or a long-distance communication network such as a cellular network, the Internet, or a computer network (e.g., LAN or WAN). You can communicate with. The various types of communication modules 1730 described above may be implemented as one chip or may be implemented as separate chips.

The input module 1300, sensor module 1610, camera module 1710, etc. may be used to control the operation of the display module 1400 in conjunction with the processor 1100.

The processor 1100 outputs commands or data to the display module 1400, the audio output module 1630, the camera module 1710, or the light module 1720 based on the input data received from the input module 1300. do. For example, the processor 1100 generates a data signal in response to input data applied through a mouse or active pen and outputs it to the display module 1400, or generates command data in response to the input data to the camera module 1710. Alternatively, it can be output to the light module 1720. When no input data is received from the input module 1300 for a certain period of time, the processor 1100 switches the operation mode of the electronic device 1000 to a low-power mode or sleep mode to consume energy from the electronic device 1000. The power generated can be reduced.

The processor 1100 outputs commands or data to the display module 1400, the audio output module 1630, the camera module 1710, or the light module 1720 based on the sensing data received from the sensor module 1610. do. For example, the processor 1100 may compare authentication data authorized by the fingerprint sensor 1610-1 with authentication data stored in the memory 1200 and then execute an application according to the comparison result. The processor 1100 may execute a command or output a corresponding data signal to the display module 1400 based on the sensing data detected by the input sensor 1610-2 or the digitizer 1610-3. When the sensor module 1610 includes a temperature sensor, the processor 1100 receives temperature data about the measured temperature from the sensor module 1610 and further performs luminance correction on the data signal based on the temperature data. can do.

The processor 1100 may receive measurement data about the presence or absence of the user, the user's location, the user's gaze, etc. from the camera module 1710. The processor 1100 may further perform luminance correction on the data signal based on the measurement data. For example, the processor 1100, which determines the presence or absence of a user through an input from the camera module 1710, sends a data signal with luminance corrected through the data conversion circuit 1120-2 or the gamma correction circuit 1120-3 to the display module. It can be output at (1400).

Some of the above components may use a communication method between peripheral devices, such as a bus, general purpose input/output (GPIO), serial peripheral interface (SPI), mobile industry processor interface (MIPI), or ultra path interconnect (UPI). They are connected to each other through a link and can exchange signals (eg, commands or data) with each other. The processor 1100 can communicate with the display module 1400 through a mutually agreed upon interface, for example, can use any one of the above-described communication methods, and is not limited to the above-described communication methods.

Electronic devices 1000 according to various embodiments disclosed in this document may be devices of various types. The electronic device 1000 may include, for example, at least one of a portable communication device (eg, a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. The electronic device 1000 according to an embodiment of this document is not limited to the devices described above.

The present invention can be applied to display devices and electronic devices including the same. For example, the present invention can be applied to digital TVs, 3D TVs, mobile phones, smart phones, tablet computers, VR devices, PCs, home electronic devices, laptop computers, PDAs, PMPs, digital cameras, music players, portable game consoles, navigation, etc. You can.

Although the description has been made with reference to the above embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will be able to.

1000: Electronic device 1100: Processor
1110: Main processor 1110-1: CPU
1110-2: GPU 1110-3: NPU
1120: Coprocessor 1120-1: Controller
1120-2: Data conversion circuit 1120-3: Gamma correction circuit
1120-4: Rendering circuit 1200: Memory
1210: Volatile memory 1220: Non-volatile memory
1300: input module 1310: first input module
1320: second input module 1400: display device
1410, 100: Display panel 1420, 300: Data driver
1430, 400: data driver 1500: power module
1600: Built-in module 1610: Sensor module
1610-1: Fingerprint sensor 1610-2: Input sensor
1610-3: Digitizer 1620: Antenna module
1630: Sound output module 1700: External module
1710: Camera module 1720: Light module
1730: Communication module 2000: External electronic device
100: display panel 200: timing controller
300: gate driver 400: data driver
500: Power voltage generator

Claims (20)

a display panel including pixels;
a gate driver that sequentially applies scan signals to pixel rows containing the pixels at a scan frequency;
a data driver that applies data voltages to the pixels;
a power voltage generator that applies a power voltage to the pixels; and
A display device comprising a timing controller that sets the ripple frequency of the power voltage to deviate from the scan frequency by more than a preset reference rate. The display device according to claim 1, wherein the reference ratio is 5%. The display device of claim 1, wherein the timing controller sets the ripple frequency to deviate from an integer multiple of the scan frequency by more than the reference ratio. The display device of claim 1, wherein the power voltage is applied to a driving transistor included in each of the pixels. The display device of claim 1, wherein the power voltage is applied to a light emitting device included in each of the pixels. The display device of claim 1, wherein the timing controller changes a driving frequency of the display panel. The display device of claim 6, wherein the timing controller sets the ripple frequency to deviate from the scan frequency at the driving frequency of the current frame by more than the reference ratio. The display device of claim 7, wherein the timing controller sets the ripple frequency to deviate from an integer multiple of the scan frequency at the driving frequency of the current frame by more than the reference rate. The method of claim 6, wherein the timing controller
Set the driving frequency to one of the set frequencies,
A display device characterized in that the ripple frequency is set to deviate from the scan frequency at each of the set frequencies by more than the reference ratio. The display device of claim 9, wherein the timing controller sets the ripple frequency to deviate from an integer multiple of the scan frequency at each of the set frequencies by more than the reference ratio. sequentially applying scan signals to pixel rows at a scan frequency;
Setting the ripple frequency of the power supply voltage to deviate from the scan frequency by more than a preset reference rate; and
A method of driving a display device comprising applying the power voltage to pixels included in the pixel rows. The method of claim 11, wherein the reference ratio is 5%. The method of claim 11, wherein the ripple frequency is set to deviate from an integer multiple of the scan frequency by more than the reference rate. The method of claim 11, wherein the power voltage is applied to a driving transistor included in each of the pixels. The method of claim 11, wherein the power voltage is applied to a light emitting device included in each of the pixels. According to claim 1,
A method of driving a display device, further comprising varying the driving frequency of the display panel including the pixels. The method of claim 16, wherein the ripple frequency is set to deviate from the scan frequency at the driving frequency of the current frame by more than the reference ratio. The method of claim 17, wherein the ripple frequency is set to deviate from an integer multiple of the scan frequency at the driving frequency of the current frame by more than the reference ratio. 17. The method of claim 16, wherein the driving frequency is set to one of set frequencies,
The ripple frequency is set to deviate from the scan frequency at each of the set frequencies by more than the reference rate,
Wherein the ripple frequency is set to deviate from an integer multiple of the scan frequency at each of the set frequencies by more than the reference ratio. a display module including pixels;
a main processor that outputs a synchronization signal to a secondary processor; and
An electronic device comprising an auxiliary processor that sets the ripple frequency of the power voltage applied to the pixels to deviate from a scan frequency set to be synchronized to the synchronization signal by more than a preset reference rate.

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