CN117727262A - Display device, method of driving the same, and electronic device - Google Patents

Abstract

The present disclosure relates to a display device, a method of driving the display device, and an electronic device. The display device includes: a display panel including a plurality of pixels; a gate driver sequentially applying a scan signal to a pixel row including the plurality of pixels at a scan frequency; a data driver applying a data voltage to the plurality of pixels; a power supply voltage generator that applies a power supply voltage to the plurality of pixels; a timing controller that sets a ripple frequency of the power supply voltage to deviate from the sweep frequency by a predetermined reference ratio or more.

Description

Display device, method of driving the same, and electronic device

Technical Field

Embodiments of the inventive concept relate to a display device, a method of driving the display device, and an electronic device. More particularly, embodiments of the inventive concept relate to a display device applying a power supply voltage to a pixel, a method of driving the display device, and an electronic device.

Background

In general, a display device may include a display panel, a timing controller, a gate driver, and a data driver. The display panel may include a plurality of gate lines, a plurality of data lines, and a plurality of pixels electrically connected to the gate lines and the data lines. The gate driver may respectively supply gate signals to the gate lines. The data driver may supply data voltages to the data lines, respectively. The timing controller may control the gate driver and the data driver.

The display device may further include a power supply voltage generator generating a power supply voltage for driving the pixels. The supply voltage generator may rectify an alternating current ("AC") voltage to generate a supply voltage that is a direct current ("DC") voltage.

Disclosure of Invention

Even when an alternating current ("AC") voltage is rectified, the AC component of the supply voltage may remain partially as a ripple voltage.

Embodiments of the inventive concept provide a display device to reduce a luminance difference caused by a ripple voltage.

Embodiments of the inventive concept also provide a method of driving a display device.

Embodiments of the inventive concept also provide an electronic device including a display module.

In an embodiment of the inventive concept, a display device may include: a display panel including a plurality of pixels; a gate driver sequentially applying a scan signal to a pixel row including the plurality of pixels at a scan frequency; a data driver applying a data voltage to the plurality of pixels; a power supply voltage generator that applies a power supply voltage to the plurality of pixels; a timing controller that sets a ripple frequency of the power supply voltage to deviate from the sweep frequency by a predetermined reference ratio or more.

In an embodiment, the predetermined reference ratio may be about 5%.

In an embodiment, the timing controller may set the ripple frequency to deviate from an integer multiple of the sweep frequency by the predetermined reference ratio or more.

In an embodiment, the power supply voltage may be applied to a driving transistor included in each of the plurality of pixels.

In an embodiment, the power supply voltage may be applied to a light emitting element included in each of the plurality of pixels.

In an embodiment, the timing controller may change a driving frequency of the display panel.

In an embodiment, the timing controller may set the ripple frequency to deviate from the scanning frequency at the driving frequency of a current frame by the predetermined reference ratio or more.

In an embodiment, the timing controller may set the ripple frequency to deviate from an integer multiple of a scanning frequency at a driving frequency of a current frame by the predetermined reference ratio or more.

In an embodiment, the timing controller may set the driving frequency to one of a plurality of setting frequencies, and the timing controller may set the ripple frequency to deviate from a scanning frequency at each of the plurality of setting frequencies by the predetermined reference ratio or more.

In an embodiment, the timing controller may set the ripple frequency to deviate from an integer multiple of the plurality of scanning frequencies at each of the set frequencies by the predetermined reference ratio or more.

According to an embodiment of the inventive concept, a method of driving a display device may include: sequentially applying a scanning signal to the pixel rows at a scanning frequency; setting a ripple frequency of a power supply voltage to deviate from the sweep frequency by a predetermined reference ratio or more; and applying the power supply voltage to a plurality of pixels included in the pixel row.

In an embodiment, the predetermined reference ratio may be about 5%.

In an embodiment, the ripple frequency may be set to deviate from an integer multiple of the sweep frequency by the predetermined reference ratio or more.

In an embodiment, the power supply voltage may be applied to a driving transistor included in each of the plurality of pixels.

In an embodiment, the power supply voltage may be applied to a light emitting element included in each of the plurality of pixels.

In an embodiment, the method may further comprise: the driving frequency of a display panel including the plurality of pixels is changed.

In an embodiment, the ripple frequency may be set to deviate from the sweep frequency at the driving frequency of the current frame by the predetermined reference ratio or more.

In an embodiment, the ripple frequency may be set to deviate from an integer multiple of the sweep frequency at the driving frequency of the current frame by the predetermined reference ratio or more.

In an embodiment, the driving frequency may be set to one of a plurality of setting frequencies, and the ripple frequency may be set to deviate from a sweep frequency at each of the plurality of setting frequencies by the predetermined reference ratio or more.

In an embodiment of the inventive concept, an electronic device may include: a display module including pixels; a main processor which outputs a synchronization signal; and a sub-processor receiving the synchronization signal and setting a ripple frequency of a power supply voltage applied to the pixel to deviate from a sweep frequency, which is set to be synchronized with the synchronization signal, by a predetermined reference ratio or more.

Accordingly, the display device may reduce a luminance difference caused by a ripple voltage by including a display panel including pixels, a gate driver sequentially applying a scan signal to a pixel row including the pixels at a scan frequency, a data driver applying a data voltage to the pixels, a power supply voltage generator applying a power supply voltage to the pixels, and a timing controller setting a ripple frequency of the power supply voltage to deviate from the scan frequency by a predetermined reference ratio or more.

In addition, the method of driving the display device may prevent a waterfall (waterfall) phenomenon by reducing a brightness difference caused by the ripple voltage.

However, the effects of the inventive concept are not limited to the effects described above, and various extensions may be made without departing from the spirit and scope of the inventive concept.

Drawings

The above and other exemplary embodiments, advantages and features of the present disclosure will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings in which:

fig. 1 is a block diagram illustrating an embodiment of a display device according to the inventive concept.

Fig. 2 is a circuit diagram illustrating an embodiment of a pixel of the display device of fig. 1.

Fig. 3 is a diagram illustrating an embodiment of a first power supply voltage of the display device of fig. 1.

Fig. 4 is a timing diagram illustrating an embodiment of a scan signal of the display device of fig. 1.

Fig. 5 is a timing chart showing a comparative example of the first power supply voltage and the scan signal.

Fig. 6 is a diagram showing the degree to which the waterfall phenomenon is recognized according to the ripple frequency.

Fig. 7 is a diagram illustrating an embodiment in which the display device of fig. 1 sets a ripple frequency.

Fig. 8 is a diagram showing an embodiment of the degree to which the waterfall phenomenon is recognized according to the ripple frequency.

Fig. 9 is a diagram illustrating an embodiment of setting a ripple frequency of a display device according to the inventive concept.

Fig. 10 is a diagram illustrating an embodiment in which a display device sets a ripple frequency according to the inventive concept.

Fig. 11 is a flowchart illustrating an embodiment of a method of driving a display device according to the inventive concept.

Fig. 12 is a block diagram illustrating an embodiment of an electronic device according to the inventive concept.

Fig. 13 is a diagram illustrating an embodiment in which the electronic device of fig. 12 is implemented as a television.

Detailed Description

Hereinafter, the inventive concept will be described in detail with reference to the accompanying drawings.

It will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present.

It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a "first element," "first component," "first region," "first layer," or "first portion" discussed below may be termed a "second element," "second component," "second region," "second layer," or "second portion" without departing from the teachings herein.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, including "at least one" unless the content clearly indicates otherwise. "or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises" and/or "comprising," or "includes" when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.

Furthermore, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe one element's relationship to another element as illustrated in the figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in one of the figures is turned over, elements described as being on the "lower" side of other elements would then be oriented on the "upper" side of the other elements. Thus, the exemplary term "lower" may encompass both an orientation of "lower" and "upper" depending on the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as "below" or "beneath" other elements would then be oriented "above" the other elements. Thus, the exemplary term "below … …" or "below … …" may encompass both an orientation of above and below.

In view of the measurements in question and errors associated with the measurement of a particular quantity (i.e., limitations of the measurement system), as used herein, "about" or "approximately" includes the stated values and is intended to be within the acceptable range of deviation for the particular value as determined by one of ordinary skill in the art. For example, a term such as "about" may mean within one or more standard deviations, or within ±30%, ±20%, ±10% or ±5% of the stated value.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and this disclosure and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Fig. 1 is a block diagram illustrating an embodiment of a display device according to the inventive concept.

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 supply voltage generator 500. In an embodiment, the timing controller 200 and the data driver 400 may be integrated into one chip.

The display panel 100 has a display area AA on which an image is displayed and a peripheral area PA adjacent to the display area AA. In an embodiment, the gate driver 300 may be disposed (e.g., mounted) on the peripheral area PA of the display panel 100.

The display panel 100 may include a plurality of gate lines GL, a plurality of data lines DL, and a plurality of pixels P electrically connected to the corresponding data lines DL and the corresponding gate lines GL. The gate line GL may extend in a first direction D1, and the data line DL may extend in a second direction D2 crossing the first direction D1.

The timing controller 200 may receive input image data IMG and input control signals CONT from a main processor (e.g., a graphic processing unit ("GPU")). In an embodiment, for example, the input image data IMG may include red image data, green image data, and blue image data. In an embodiment, the input image data IMG may further include white image data. In another embodiment, for example, the input image data IMG may include magenta image data, yellow image data, and cyan image data. The input control signals 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.

The timing controller 200 may generate the first control signal CONT1, the second control signal CONT2, the third control signal CONT3, and the DATA signal DATA based on the input image DATA IMG and the input control signal CONT.

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 the input image DATA IMG and the input control signal CONT and generate the DATA signal DATA. The timing controller 200 may output the 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 a gate signal (e.g., a scan signal) for driving the gate line GL in response to the first control signal CONT1 input from the timing controller 200. The gate driver 300 may output a gate signal to the gate line GL. In an embodiment, for example, the gate driver 300 may sequentially output gate signals to the gate lines GL.

The DATA driver 400 may receive the second control signal CONT2 and the DATA signal DATA from the timing controller 200. The DATA driver 400 may convert the DATA signal DATA into a DATA voltage having an analog type. The data driver 400 may output a data voltage to the data line DL.

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

Fig. 2 is a circuit diagram illustrating an embodiment of a pixel P of the display device of fig. 1.

Referring to fig. 2, each of the plurality of pixels P may include a scan transistor ST writing a data voltage VDATA to a storage capacitor CST in response to a scan signal SC, a driving transistor DT receiving a first power voltage ELVDD (e.g., a substantially high power voltage) and generating a driving current corresponding to the written data voltage VDATA, and a light emitting element EE receiving a second power voltage ELVSS (e.g., a substantially low power voltage) and receiving a driving current to emit light.

In an embodiment, for example, each of the plurality of pixels P may include a scan transistor ST including 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 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 light emitting element EE including a first electrode connected to the second node N2 and a second electrode receiving the second power voltage ELVSS.

In this embodiment, each of the plurality of pixels P is illustrated as having a 2T1C structure composed of two transistors and one capacitor, but the inventive concept is not limited thereto. In an embodiment, each of the plurality of pixels P may have a 3T1C structure composed of three transistors and one capacitor, a 5T2C structure composed of five transistors and two capacitors, a 7T1C structure composed of seven transistors and one capacitor, a 9T1C structure composed of nine transistors and one capacitor, and the like.

In an embodiment, the driving transistor DT may further include a lower electrode. In an embodiment, for example, a lower electrode of the driving transistor DT may be connected to a first electrode of the driving transistor DT.

The scan transistor ST and the driving transistor DT may be implemented as P-channel metal oxide semiconductor ("PMOS") transistors. In this case, the low voltage level may be an active level and the high voltage level may be an inactive level. In an embodiment, for example, the PMOS transistor may be turned on when a signal applied to a control electrode of the PMOS transistor has a low voltage level. In an embodiment, for example, the PMOS transistor may be turned off when a signal applied to a control electrode of the PMOS transistor has a high voltage level.

However, the inventive concept is not limited thereto. In an embodiment, for example, the scan transistor ST and the driving transistor DT may be implemented as N-channel metal oxide semiconductor ("NMOS") transistors.

In an embodiment, for example, in the initialization period, the scan signal SC may have an active 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 storage capacitor CST) may be initialized.

In an embodiment, for example, in the data writing period, the scan signal SC may have an active 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).

In an embodiment, for example, in the light emission period, the scan signal SC may have an inactive level, and the scan transistor ST may be turned off. Accordingly, the driving transistor DT may generate a driving current, and the driving current may be applied to the light emitting element EE (i.e., a light emitting operation). That is, the light emitting element EE may emit light having a luminance corresponding to the driving current.

Fig. 3 is a diagram illustrating an embodiment of the first power supply voltage ELVDD of the display device of fig. 1.

Referring to fig. 1 and 3, the power supply voltage generator 500 may generate the first power supply voltage ELVDD by rectifying an AC voltage. However, even when the AC voltage is rectified, the AC component of the first power supply voltage ELVDD may partially remain as the ripple voltage VR in the first power supply voltage ELVDD. Accordingly, the first power supply voltage ELVDD may be a sum of the DC voltage VDC and the ripple voltage VR.

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

The power supply voltage generator 500 may rectify the AC voltage to generate the second power supply voltage ELVSS. Similar to the first power supply voltage ELVDD, the AC component of the second power supply voltage ELVSS may partially remain as the ripple voltage VR.

Fig. 4 is a timing chart showing an embodiment of a scan signal SC (see fig. 2) of the display device of fig. 1.

Referring to fig. 1 and 4, the gate driver 300 may sequentially apply scan signals SC [1], SC [2], SC [3], SC [4], … …, SC [ N-1], SC [ N ] to a pixel row including the pixels P at a scan frequency. Here, N is a positive integer greater than 2.

In an embodiment, for example, the gate driver 300 may apply the scan signals SC [1], SC [2], SC [3], SC [4], … …, SC [ N-1], SC [ N ] to one pixel row every horizontal time 1H. That is, the number of repetitions of one horizontal time 1H per second may be the same as the scanning frequency.

As described above, the data voltages may be written to the pixels P in response to the scan signals SC [1], SC [2], SC [3], SC [4], … …, SC [ N-1], SC [ N ]. Accordingly, the data voltage may be written to the pixels P of one pixel row every horizontal time 1H.

In this embodiment, it is illustrated that the gate driver 300 applies the scan signals SC [1], SC [2], SC [3], SC [4], … …, SC [ N-1], SC [ N ] to one pixel row every horizontal time 1H, but the inventive concept is not limited thereto. In an embodiment, for example, the gate driver 300 may apply scan signals SC [1], SC [2], SC [3], SC [4], … …, SC [ N-1], SC [ N ] to N pixel rows.

Fig. 5 is a timing chart showing a comparative example of the first power supply voltage ELVDD and the scan signals SC [1], SC [2], SC [3], SC [4], SC [5], SC [6], SC [7], and fig. 6 is a diagram showing the degree to which the waterfall phenomenon is recognized according to the ripple frequency RF.

In fig. 6, the unit of the ripple frequency RF is kilohertz (kHz), and the degree to which the waterfall phenomenon is recognized is classified as "strong", "medium", "weak", and "none". The degree to which the waterfall phenomenon is identified is in the order of "strong", "medium", "weak" from strong to weak (or from high to low), and "none" indicates that the waterfall phenomenon is not identified.

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

Referring to fig. 1 and 5, when a data voltage is written in each of a plurality of pixel rows, a voltage value of the first power voltage ELVDD applied to the pixel P may be changed. In addition, as the voltage difference of the first power supply voltage ELVDD increases, the luminance difference between the pixel rows may increase.

In the comparative example of fig. 5, for example, a voltage difference of the first power supply voltage ELVDD between when the data voltage is written to the first pixel row (i.e., when the scan signal SC [1] applied to the first pixel row has been at the active level) and when the data voltage is written to the fifth pixel row (i.e., when the scan signal SC [5] applied to the fifth pixel row has been at the active level) may be maximum. Therefore, in fig. 5, the luminance difference between the first pixel row and the fifth pixel row may be the largest.

In this way, a luminance difference between pixel rows may be generated between the pixel rows, and a waterfall phenomenon may occur due to the luminance difference.

In the comparative example of fig. 5, the luminance difference caused by the ripple frequency of the first power supply voltage ELVDD is described, but the luminance difference may also be caused by the ripple frequency of the second power supply voltage ELVSS.

Referring to fig. 1 and 6, like the beat phenomenon, the more similar the sweep frequency SF and the ripple frequency RF are, the more strongly the waterfall phenomenon is recognized. Further, like the beat phenomenon, the more similar the integer multiple of the sweep frequency SF and the ripple frequency RF, the more strongly the waterfall phenomenon is recognized.

In an embodiment, for example, when the driving frequency DF of the display panel 100 is 60 hertz (Hz), the scanning frequency SF may be about 97.1kHz. Integer multiples of the sweep frequency SF may be about 97.1kHz, about 194.2kHz, and about 291.3kHz. As shown in fig. 6, when the ripple frequency RF is about 185kHz, about 195kHz, and about 295kHz, the waterfall phenomenon may be strongly recognized. That is, at about 185kHz and about 195kHz, which are close to twice the sweep frequency SF, and at about 295kHz, which is close to three times the sweep frequency SF, the waterfall phenomenon may be strongly recognized.

Accordingly, in order to prevent the waterfall phenomenon, the display device may set the ripple frequency RF to deviate from the scan frequency SF by a predetermined range or more.

Fig. 7 is a diagram illustrating an embodiment of setting the ripple frequency RF of the display device of fig. 1.

Referring to fig. 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 predetermined reference ratio or more. The timing controller 200 may set the ripple frequency RF to deviate from the integral multiple of the scan frequency SF by a reference ratio or more.

In an embodiment, for example, the reference ratio may be about 5%. When the driving frequency DF of the display panel 100 is about 60Hz, the scanning frequency SF may be about 97.1kHz. Integer multiples of the sweep frequency SF may be about 97.1kHz, about 194.2kHz, and about 291.3kHz. The range of + -5% of about 97.1kHz may be about 92.2kHz to about 102kHz. The range of + -5% of about 194.2kHz may be about 184.5kHz to about 205kHz. About 291.3kHz ± 5% may range from about 276.6kHz to about 305.8kHz. Thus, the ripple frequency RF may be set to one of frequencies other than about 92.2kHz to about 102kHz, about 184.5kHz to about 205kHz, and about 276.6kHz to about 305.8kHz.

In this embodiment, only one, two and three times the scanning frequency SF are illustrated, but the inventive concept is not limited thereto.

In an embodiment, the timing controller 200 may set the ripple frequency RF of the first power supply voltage ELVDD or the ripple frequency RF of the second power supply voltage ELVSS. In another embodiment, the timing controller 200 may set both the ripple frequency RF of the first power supply voltage ELVDD and the ripple frequency RF of the second power supply voltage ELVSS. That is, in order to prevent the waterfall phenomenon, the display device may adjust only the ripple frequency RF of the first power supply voltage ELVDD, adjust only the ripple frequency RF of the second power supply voltage ELVSS, or adjust both the ripple frequency RF of the first power supply voltage ELVDD and the ripple frequency RF of the second power supply voltage ELVSS.

Fig. 8 is a diagram illustrating an embodiment in which a waterfall phenomenon according to a ripple frequency RF is recognized, and fig. 9 is a diagram illustrating an embodiment in which the ripple frequency RF is set in a display device according to the inventive concept.

The display device in the illustrated embodiment is substantially the same as the display device of fig. 1, except that the driving frequency DF and the ripple frequency RF are changed. Therefore, the same reference numerals are used to designate the same or similar elements, and any repetitive description will be omitted.

In fig. 8 and 9, the unit of the ripple frequency RF is kilohertz (kHz), and the degree to which the waterfall phenomenon is recognized is classified as "strong", "medium", "weak", and "none". The degree to which the waterfall phenomenon is identified is in the order of "strong", "medium", "weak" from strong to weak (or from high to low), and "none" indicates that the waterfall phenomenon is not identified.

Referring to fig. 1, 2, 8, and 9, the timing controller 200 may change the driving frequency DF of the display panel 100. In an embodiment, for example, the timing controller 200 may set the driving frequency DF to one of the set frequencies. In an embodiment, for example, the timing controller 200 may set the driving frequency DF to one of about 60Hz, about 120Hz, and about 175 Hz.

In this embodiment, the setting frequencies are 60Hz, 120Hz, and 175Hz are exemplified, but the inventive concept 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 a reference ratio or more. 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 a reference ratio or more.

Since the scan signal SC is sequentially applied to the pixel rows at the scan frequency SF, the scan frequency SF may also be changed when the driving frequency DF of the display panel 100 is changed. Since the sweep frequencies SF are different, the ripple frequencies RF in which the waterfall phenomenon is recognized may also be different. Accordingly, the display device can set the ripple frequency RF according to the driving frequency DF of the current frame.

In an embodiment, for example, the reference ratio may be about 5%. When the driving frequency DF of the current frame is about 60Hz, the scanning frequency SF may be about 97.1kHz. Integer multiples of the sweep frequency SF may be about 97.1kHz, about 194.2kHz, and about 291.3kHz. The range of + -5% of about 97.1kHz may be about 92.2kHz to about 102kHz. The range of + -5% of about 194.2kHz may be about 184.5kHz to about 205kHz. About 291.3kHz ± 5% may range from about 276.6kHz to about 305.8kHz. Thus, the ripple frequency RF may be set to one of frequencies other than about 92.2kHz to about 102kHz, about 184.5kHz to about 205kHz, and about 276.6kHz to about 305.8kHz.

In an embodiment, for example, the reference ratio may be about 5%. When the driving frequency DF of the current frame is about 120Hz, the scanning frequency SF may be about 194.2kHz. Integer multiples of the sweep frequency SF may be about 194.2kHz, about 388.4kHz, and about 582.6kHz. The range of + -5% of about 194.2kHz may be about 184.5kHz to about 205kHz. About 388.4kHz ± 5% may range from about 369kHz to about 407.8kHz. About 582.6kHz ± 5% may range from about 553.5kHz to about 611.7kHz. Thus, the ripple frequency RF may be set to one of frequencies other than about 184.5 to about 205kHz, about 369 to about 407.8kHz, and about 553.5 to about 611.7kHz.

In an embodiment, the reference ratio may be about 5%. For example, when the driving frequency DF of the current frame is about 175Hz, the scanning frequency SF may be about 283.3kHz. Integer multiples of the sweep frequency SF may be about 283.3kHz, about 566.6kHz, and about 849.9kHz. About 283.3kHz ± 5% may range from about 269.1kHz to about 297.5kHz. About 566.6kHz ± 5% may range from about 538.3kHz to about 594.9kHz. About 849.9kHz ± 5% may range from about 807.4kHz to about 892.4kHz. Accordingly, the ripple frequency RF may be set to one of frequencies other than about 269.1 to about 297.5kHz, about 538.3 to about 594.9kHz, and about 807.4 to about 892.4kHz.

That is, the ripple frequency RF may vary with the change of the driving frequency DF.

In this embodiment, only one, two and three times the scanning frequency SF are illustrated, but the inventive concept is not limited thereto.

Fig. 10 is a diagram illustrating an embodiment of setting a ripple frequency RF of a display device according to the inventive concept.

The display device in the illustrated embodiment is substantially the same as the display device of fig. 9, except that the ripple frequency RF does not change when the driving frequency DF changes. Therefore, the same reference numerals are used to designate the same or similar elements, and any repetitive description will be omitted.

In fig. 10, the unit of the ripple frequency RF is kilohertz (kHz), and the degree to which the waterfall phenomenon is recognized is classified as "strong", "medium", "weak", and "none". The degree to which the waterfall phenomenon is identified is in the order of "strong", "medium", "weak" from strong to weak (or from high to low), and "none" indicates that the waterfall phenomenon is not identified.

Referring to fig. 1, 2 and 10, the timing controller 200 may change the driving frequency DF of the display panel 100. In an embodiment, for example, the timing controller 200 may set the driving frequency DF to one of the set frequencies. In an embodiment, for example, the timing controller 200 may set the driving frequency DF to one of about 60Hz, about 120Hz, and about 175 Hz.

In this embodiment, the set frequencies are exemplified as 60Hz, 120Hz, and 175Hz, but the inventive concept is not limited thereto.

The timing controller 200 may set the ripple frequency RF to deviate from the scan frequency SF at each of a plurality of set frequencies by a reference ratio or more. The timing controller 200 may set the ripple frequency RF to deviate from an integer multiple of the scan frequency SF at each of the plurality of set frequencies by a reference ratio or more.

Since the scan signal SC is sequentially applied to the pixel rows at the scan frequency SF, the scan frequency SF may also be changed when the driving frequency DF of the display panel 100 is changed. Since the sweep frequencies SF are different, the ripple frequencies RF in which the waterfall phenomenon is recognized may also be different. Accordingly, the display device may set the ripple frequency RF in consideration of all frequencies (i.e., set frequencies) that may be the driving frequency DF.

In an embodiment, for example, the reference ratio may be about 5%. When the set frequencies are about 60Hz, about 120Hz, and about 175Hz, the frequencies that can be used as the sweep frequency SF can be about 97.1kHz, about 194.2kHz, and about 283.3kHz. Frequencies that may be integer multiples of the sweep frequency SF may be about 97.1kHz, about 194.2kHz, about 283.3kHz, about 291.3kHz, about 388.4kHz, about 566.6kHz, about 582.6kHz, and about 849.9kHz. The range of + -5% of about 97.1kHz may be about 92.2kHz to about 102kHz. The range of + -5% of about 194.2kHz may be about 184.5kHz to about 205kHz. About 283.3kHz ± 5% may range from about 269.1kHz to about 297.5kHz. About 291.3kHz ± 5% may range from about 276.6kHz to about 305.8kHz. About 388.4kHz ± 5% may range from about 369kHz to about 407.8kHz. About 566.6kHz ± 5% may range from about 538.3kHz to about 594.9kHz. About 582.6kHz ± 5% may range from about 553.5kHz to about 611.7kHz. About 849.9kHz ± 5% may range from about 807.4kHz to about 892.4kHz. Accordingly, the ripple frequency RF may be set to one of frequencies other than about 92.2kHz to about 102kHz, about 184.5kHz to about 205kHz, about 269.1kHz to about 297.5kHz, about 276.6kHz to about 305.8kHz, about 369kHz to about 407.8kHz, about 538.3kHz to about 594.9kHz, about 553.5kHz to about 611.7kHz, and about 807.4kHz to about 892.4kHz.

That is, the ripple frequency RF may vary with the change of the driving frequency DF.

In this embodiment, only one, two and three times the scanning frequency SF are illustrated, but the inventive concept is not limited thereto.

Fig. 11 is a flowchart illustrating an embodiment of a method of driving a display device according to the inventive concept.

Referring to fig. 11, the method of fig. 11 may include sequentially applying a scan signal to pixel rows at a scan frequency (S100), setting a ripple frequency of a power supply voltage to deviate from the scan frequency by a predetermined reference ratio or more (S200), and applying the power supply voltage to pixels included in the pixel rows (S300).

In the embodiment, for example, a driving frequency described below may be set to be synchronized with the vertical synchronization signal. In the embodiment, for example, a scanning frequency described later may be set to be synchronized with the horizontal synchronization signal.

Specifically, the method of fig. 11 may include sequentially applying a scan signal to the pixel rows at a scan frequency (S100). The data voltage may be written to the pixel in response to the scan signal.

In an embodiment, for example, each of the pixels may include a scan transistor writing a data voltage to a storage capacitor in response to a scan signal, a driving transistor receiving a first power supply voltage and generating a driving current corresponding to the written data voltage, and a light emitting element receiving a second power supply voltage and receiving the driving current to emit light.

Specifically, the method of fig. 11 may include setting a ripple frequency of the power supply voltage to deviate from the sweep frequency by a predetermined reference ratio or more (S200). The ripple frequency may be set to deviate from the integral multiple of the sweep frequency by a reference ratio or more. In an embodiment, the reference ratio may be about 5%.

In an embodiment, for example, the method of fig. 11 may change the driving frequency of a display panel including pixels. In an embodiment, for example, the driving frequency may be set to one of a plurality of setting frequencies.

In an embodiment, the ripple frequency may be set to deviate from the sweep frequency at the driving frequency of the current frame by a reference ratio or more. The ripple frequency may be set to deviate from an integer multiple of the sweep frequency at the driving frequency of the current frame by a reference ratio or more. That is, the ripple frequency may change as the driving frequency changes.

In an embodiment, the ripple frequency may be set to deviate from the sweep frequency by a reference ratio or more at each of a plurality of set frequencies. The ripple frequency may be set to deviate from an integer multiple of the sweep frequency at each of the plurality of set frequencies by a reference ratio or more. That is, the ripple frequency may not change with a change in the driving frequency.

In this illustrated embodiment, scanning pixel rows sequentially is illustrated, but the inventive concept is not so limited. In an embodiment, for example, the scan signals may be sequentially applied to the pixel columns at a scan frequency. In this case, the display device in the embodiments of the inventive concept may prevent a waterfall phenomenon in which a vertical line is recognized.

In addition, in the illustrated embodiment, the timing controller is illustrated to set the ripple frequency of the power supply voltage, but the inventive concept is not limited thereto.

Fig. 12 is a block diagram illustrating an embodiment of an electronic device 1000 according to the inventive concept, and fig. 13 is a diagram illustrating an embodiment in which the electronic device 1000 of fig. 12 is implemented as a television.

Referring to fig. 12 and 13, the electronic device 1000 may output various information through the display module 1400 within the operating system. When the processor 1100 executes an application program stored in the memory 1200, the display module 1400 may provide application information to a user through the display panel 1410. In this case, the display panel 1410 may be the display panel 100 of fig. 1.

In an embodiment, as shown in fig. 13, the electronic device 1000 may be implemented as a television. However, the electronic device 1000 is not limited thereto. In embodiments, for example, electronic device 1000 may be implemented as a cellular telephone, video telephone, smart tablet, smart watch, tablet personal computer ("PC"), car navigation system, computer monitor, laptop computer, head mounted display ("HMD") device, and the like.

The processor 1100 may obtain external input through the input module 1300 or the sensor module 1610 and execute an application corresponding to the external input. In an embodiment, when a user selects a camera icon displayed on the display panel 1410, the processor 1100 may obtain user input through the input sensor 1610-2 and activate the camera module 1710. The processor 1100 may transmit a data signal corresponding to the photographed image acquired through the camera module 1710 to the display module 1400. The display module 1400 may display an image corresponding to the photographed image through the display panel 1410.

In another embodiment, when personal information authentication is performed in the display module 1400, the fingerprint sensor 1610-1 may obtain input fingerprint information as input data. The processor 1100 may compare input data acquired through the fingerprint sensor 1610-1 with authentication data stored in the memory 1200 and execute an application according to the comparison result. The display module 1400 may display information executed according to application logic through the display panel 1410.

In another embodiment, when a music streaming icon displayed on the display module 1400 is selected, the processor 1100 may obtain user input through the input sensor 1610-2 and activate a music streaming application stored in the memory 1200. When a music execution command is input in the music streaming application, the processor 1100 may activate the sound output module 1630 to provide sound information corresponding to the music execution command to the user.

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

The electronic device 1000 may communicate with the external electronic device 2000 through a network (e.g., a short-range wireless communication network or a long-range wireless communication network). In an embodiment, the electronic device 1000 may include a processor 1100, a memory 1200, an input module 1300, a display module 1400, a power module 1500, an embedded module 1600, and an external module 1700. In an embodiment, in the electronic device 1000, at least one of the components described above may be omitted, or one or more other components may be added. In an embodiment, some of the plurality of components (e.g., the sensor module 1610, the antenna module 1620, or the sound output module 1630) may be integrated into another component (e.g., the display module 1400).

The processor 1100 may execute software to control at least one other component (e.g., hardware or software component) of the electronic device 1000 that is connected to the processor 1100 and perform various data processing or calculations. In an embodiment, as at least part of data processing or computation, the processor 1100 may store commands or data received from other components (e.g., the input module 1300, the sensor module 1610, or the communication module 1730) in the volatile memory 1210, and process the commands or data stored in the volatile memory 1210, and the resulting data may be stored in the nonvolatile memory 1220.

The processor 1100 may include a main processor 1110 and a sub-processor 1120. The host processor 1110 may include one or more of a central processing unit ("CPU") 1110-1 and an application processor ("AP"). Host processor 1110 may also include any one or more of a graphics processing unit ("GPU") 1110-2, a communication processor ("CP"), and an image signal processor ("ISP"). The host processor 1110 may also include a neural network processing unit ("NPU") 1110-3. The neural network processing unit 1110-3 may be a processor that specifically processes the artificial intelligence model, and the artificial intelligence model may be generated through machine learning. The artificial intelligence model may include a plurality of artificial neural network layers. The artificial neural network may include a deep neural network ("DNN"), a convolutional neural network ("CNN"), a recurrent neural network ("RNN"), a restricted boltzmann machine ("RBM"), a deep belief network ("DBN"), a bi-directional recurrent deep neural network ("BRDNN"), a deep Q network, or a combination of two or more of the foregoing, but is not limited to the above embodiments. In addition to hardware structures, the artificial intelligence model may additionally or alternatively include software structures. At least two of the processing units and processors described above may be implemented as integrated components (e.g., a single chip), or each may be implemented as separate components (e.g., multiple chips). In an embodiment, an electronic device includes: a display module including pixels; a main processor outputting a synchronization signal; and a sub-processor receiving the synchronization signal and setting a ripple frequency of a power supply voltage applied to the pixel to deviate from a scanning frequency by a predetermined reference ratio or more, the scanning frequency being set to be synchronized with the synchronization signal.

The sub-processor 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 may receive input image data from the main processor 1110, convert a data format of the input image data to meet an interface specification with the display module 1400, and output a data signal. The controller 1120-1 may output various control signals required to drive the display module 1400.

The sub-processor 1120 may further include a data conversion circuit 1120-2, a gamma correction circuit 1120-3, a rendering circuit 1120-4, or the like. The data conversion circuit 1120-2 may receive the data signal from the controller 1120-1 and compensate the data signal so that an image is displayed at a desired brightness according to characteristics of the electronic device 1000 or a user's setting, or convert the data signal to reduce power consumption or compensate for an afterimage. The gamma correction circuit 1120-3 may convert the data signal or the gamma reference voltage so that an image displayed on the electronic device 1000 has a desired gamma characteristic. The rendering circuit 1120-4 may receive the data signals from the controller 1120-1 and render the data signals in consideration of pixel arrangements applied to the display panel 1410 of 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 may be integrated into other components (e.g., the main processor 1110 or the controller 1120-1).

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 described later.

In this case, the sub-processor 1120 may be the timing controller 200 of fig. 1.

The memory 1200 may store 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 to the various data. The memory 1200 may include at least one of a volatile memory 1210 and a non-volatile memory 1220.

The input module 1300 may receive commands or data to be used for components of the electronic device 1000 (e.g., the processor 1100, the sensor module 1610, or the sound output module 1630) from outside the electronic device 1000 (e.g., the user or the external electronic device 2000).

The input module 1300 may include a first input module 1310 into which a command or data from a user is input and a second input module 1320 into which a command or data from the external electronic device 2000 is input. The first input module 1310 may include a microphone, a mouse, a keyboard, keys (e.g., buttons) or a pen (e.g., a passive pen or an active pen). The second input module 1320 may support a specified protocol capable of being connected to the external electronic device 2000 in a wired or wireless manner. In an embodiment, the second input module 1320 may include a high definition multimedia interface ("HDMI"), a universal serial bus ("USB") interface, a secure digital ("SD") card interface, or an audio interface. The second input module 1320 may include a connector that may 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).

The display module 1400 may visually provide information to a 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 also include a window, a base, and a stand for protecting the display panel 1410. In this case, the gate driver 1420 and the data driver 1430 may be the gate driver 300 and the data driver 400 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 of a rigid type or may be of a flexible type capable of being curled or folded. The display module 1400 may further include a support, stand, or heat dissipation member that supports the display panel 1410.

The gate driver 1420 may be disposed (e.g., mounted) on the display panel 1410 as a driving chip. In addition, the gate driver 1420 may be integrated into the display panel 1410. In an embodiment, for example, the gate driver 1420 may include an amorphous silicon thin film transistor ("TFT") gate driver circuit ("ASG"), a substantially low temperature polysilicon ("LTPS") TFT gate driver circuit, or an oxide semiconductor TFT gate driver circuit ("OSG") built into the display panel 1410. The gate driver 1420 may receive a control signal from the controller 1120-1 and output a gate signal to the display panel 1410 in response to the control signal.

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

The data driver 1430 may receive a control signal from the controller 1120-1, convert the data signal into an analog voltage (e.g., a data voltage) in response to the control signal, and then output the data voltage to the display panel 1410.

The data driver 1430 may be integrated into other components (e.g., the controller 1120-1). The functions of the interface conversion circuit and the 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 driver and a voltage generating circuit. The voltage generating circuit may output various voltages required to drive the display panel 1410.

The power module 1500 may supply power to components of the electronic device 1000. The power module 1500 may include a battery that charges a power supply voltage. The battery may include a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell. The power module 1500 may include a power management integrated circuit ("PMIC"). The PMIC may supply the optimized power to each of the above-described modules and the later-described modules. The power module 1500 may include a wireless power transmitting/receiving member electrically connected to a battery. The wireless power transmitting/receiving means may include a plurality of antenna radiators in the form of coils.

The electronic device 1000 may also include an embedded module 1600 and an external module 1700. The embedded module 1600 may include a sensor module 1610, an antenna module 1620, and a sound 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 through the body of the user or through a pen among the first input modules 1310 and generate an electrical signal or data value corresponding to the input. The sensor module 1610 can include at least one of a fingerprint sensor 1610-1, an input sensor 1610-2, and a digitizer 1610-3.

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

The input sensor 1610-2 may generate a data value corresponding to coordinate information input through the body of the user or the pen. The input sensor 1610-2 may generate a capacitance change due to an input as a data value. The input sensor 1610-2 may detect input through the passive pen or transmit/receive data to/from the active pen.

The input sensor 1610-2 may measure biological signals such as blood pressure, moisture, or body fat. In an embodiment, for example, when a user touches a portion of his body to a sensor layer or sensing panel and does not move for a predetermined period of time, the input sensor 1610-2 may detect a bio-signal based on a change in an electric field caused by the portion of the user's body. Information desired by the user may be output to the display module 1400.

Digitizer 1610-3 may generate data values corresponding to coordinate information entered by a pen. Digitizer 1610-3 may generate as a data value an amount of electromagnetic change due to an input. Digitizer 1610-3 may detect input through a passive pen or send/receive data to/from 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 above the display panel 1410, and any one of the fingerprint sensor 1610-1, the input sensor 1610-2, and the digitizer 1610-3 (e.g., the digitizer 1610-3) may be disposed below the display panel 1410.

At least two or more of the fingerprint sensor 1610-1, the input sensor 1610-2, and the digitizer 1610-3 may be integrated into one sensing panel by the same process. When integrated into one sensing panel, the sensing panel may be disposed between the display panel 1410 and a window disposed above the display panel 1410. In an embodiment, the sensing panel may be disposed on the 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 embedded in the display panel 1410. That is, at least one of the fingerprint sensor 1610-1, the input sensor 1610-2, and the digitizer 1610-3 may be simultaneously formed by a process of forming elements (e.g., light emitting elements, transistors, etc.) included in the display panel 1410.

In addition, the sensor module 1610 may generate an electrical signal or a data value corresponding to an internal state or an external state of the electronic device 1000. The sensor module 1610 may also include, for example, a gesture sensor, a gyroscope sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared ("IR") sensor, a biological sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

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

The sound output module 1630 may be a device for outputting sound signals to the outside of the electronic device 1000, and includes, for example, a speaker for general purposes such as multimedia playback or audio recording playback, and an earpiece dedicated to receiving calls. In embodiments, the earpiece may be integrally formed with the speaker or separately formed from the speaker. The sound output components of the sound output module 1630 may be integrated with the display module 1400.

The camera module 1710 may capture still images and moving images. In an embodiment, the camera module 1710 may include one or more lenses, image sensors, or image signal processors. The camera module 1710 may also include an infrared camera capable of measuring the presence or absence of a user, the user's location, and the user's line of sight.

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

The communication module 1730 may support establishment of a wired or wireless communication channel between the electronic device 1000 and the external electronic device 2000 and perform communication through the established communication channel. Communication module 1730 may include, for example, a cellular communication module, a short-range wireless A wireless communication module, such as a communication module of a global navigation satellite system ("GNSS") communication module, or a wired communication module, such as a local area network ("LAN") communication module or a power line communication module. Communication module 1730 may be implemented by, for example, bluetooth ^TM A short-range communication network, such as a cellular network, the internet, or a computer network (e.g., a LAN or wide area network ("WAN")), wi-Fi direct, or infrared data association ("IrDA"), or a long-range communication network communicates with the external electronic device 2000. The various types of communication modules 1730 described above may be implemented as a single chip or may be implemented as separate chips.

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

The processor 1100 may output commands or data to the display module 1400, the sound output module 1630, the camera module 1710, or the light module 1720 based on input data received from the input module 1300. In an embodiment, the processor 1100 may generate a data signal corresponding to input data applied through a mouse or an active pen and output the data signal to the display module 1400, or generate command data corresponding to the input data and output the command data to the camera module 1710 or the light module 1720. When input data is not received from the input module 1300 for a predetermined period of time, the processor 1100 may transition the operation mode of the electronic device 1000 to a substantially low power mode or a sleep mode to reduce power consumption.

The processor 1100 may output commands or data to the display module 1400, the sound output module 1630, the camera module 1710, or the light module 1720 based on the sensed data received from the sensor module 1610. In an embodiment, for example, the processor 1100 may compare authentication data applied by the fingerprint sensor 1610-1 with authentication data stored in the memory 1200 and then execute an application program according to the comparison result. The processor 1100 can execute commands based on sensed data sensed by the input sensor 1610-2 or the digitizer 1610-3 or output corresponding data signals to the display module 1400. When the sensor module 1610 includes a temperature sensor, the processor 1100 may receive temperature data regarding the temperature measured from the sensor module 1610 and further perform brightness correction on the data signal based on the temperature data.

The processor 1100 may receive measurement data from the camera module 1710 regarding the presence or absence of a user, the location of the user, and the line of sight of the user. The processor 1100 may further perform brightness correction on the data signal based on the measurement data. In an embodiment, the processor 1100, which determines whether there is a user through an input from the camera module 1710, may output a data signal whose brightness is corrected through the data conversion circuit 1120-2 or the gamma correction circuit 1120-3 to the display module 1400, for example.

Some of the components may be connected to each other to exchange signals (e.g., commands or data) with each other through a communication method such as a bus, general purpose input/output ("GPIO"), serial peripheral interface ("SPI"), mobile industry processor interface ("MIPI"), or a super channel interconnect ("UPI") link between peripheral devices. In the embodiment, any one of the above-described communication methods may be used, and is not limited to the above-described communication method.

The inventive concept may be applied to any electronic device including a display device. In embodiments, the inventive concept may be applied to televisions ("TVs"), digital TVs, three-dimensional ("3D") TVs, mobile phones, smart phones, tablet computers, virtual reality ("VR") devices, wearable electronic devices, PCs, home appliances, laptop computers, personal digital assistants ("PDAs"), portable multimedia players ("PMPs"), digital cameras, music players, portable gaming devices, navigation devices, and the like.

The foregoing is illustrative of the present inventive concept and is not to be construed as limiting thereof. Although a few embodiments of the present inventive concept have been described, those skilled in the art will readily appreciate that many modifications are possible in the embodiments without materially departing from the novel teachings and advantages of the inventive concept. Accordingly, all such modifications are intended to be included within the scope of the present inventive concept as defined in the claims. In the claims means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures. Therefore, it is to be understood that the foregoing is illustrative of the present inventive concept and is not to be construed as limited to the disclosed illustrative embodiments, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims. The inventive concept is defined by the appended claims and the equivalents of the claims to be included in the inventive concept.

Claims (15)

1. A display device, wherein the display device comprises:

a display panel including a plurality of pixels;

a gate driver sequentially applying a scan signal to a pixel row including the plurality of pixels at a scan frequency;

a data driver applying a data voltage to the plurality of pixels;

a power supply voltage generator that applies a power supply voltage to the plurality of pixels; and

and a timing controller setting a ripple frequency of the power supply voltage to deviate from the sweep frequency by a predetermined reference ratio or more.

2. The display device according to claim 1, wherein the predetermined reference ratio is 5%.

3. The display device according to claim 1, wherein the timing controller sets the ripple frequency to deviate from an integer multiple of the scanning frequency by the predetermined reference ratio or more.

4. The display device according to claim 1, wherein the power supply voltage is applied to a driving transistor included in each of the plurality of pixels; or alternatively

Wherein the power supply voltage is applied to a light emitting element included in each of the plurality of pixels.

5. The display device according to claim 1, wherein the timing controller changes a driving frequency of the display panel.

6. The display device according to claim 5, wherein the timing controller sets the ripple frequency to deviate from an integer multiple of a scanning frequency at a driving frequency of a current frame by 1 or more times from the predetermined reference ratio or more.

7. The display device according to claim 5, wherein the timing controller sets the driving frequency to one of a plurality of setting frequencies, and

wherein the timing controller sets the ripple frequency to deviate from an integer multiple of a scanning frequency at each of the plurality of set frequencies by 1 or more times from the predetermined reference ratio or more.

8. A method of driving a display device, wherein the method comprises:

sequentially applying a scanning signal to the pixel rows at a scanning frequency;

setting a ripple frequency of a power supply voltage to deviate from the sweep frequency by a predetermined reference ratio or more; and

the power supply voltage is applied to a plurality of pixels included in the pixel row.

9. The method of claim 8, wherein the predetermined reference ratio is 5%.

10. The method of claim 8, wherein the ripple frequency is set to deviate from an integer multiple of the sweep frequency by a factor of 1 or more from the predetermined reference ratio or more.

11. The method of claim 8, wherein the power supply voltage is applied to a driving transistor included in each of the plurality of pixels; or alternatively

The power supply voltage is applied to a light emitting element included in each of the plurality of pixels.

12. The method of claim 8, wherein the method further comprises:

the driving frequency of a display panel including the plurality of pixels is changed.

13. The method of claim 12, wherein the ripple frequency is set to deviate from an integer multiple of a scanning frequency at a driving frequency of a current frame by 1 or more times the predetermined reference ratio or more.

14. The method of claim 12, wherein the driving frequency is set to one of a plurality of set frequencies, and

wherein the ripple frequency is set to deviate from an integer multiple of a sweep frequency at each of the plurality of set frequencies by 1 or more times from the predetermined reference ratio or more.

15. An electronic device, wherein the electronic device comprises:

a display module including pixels;

a main processor which outputs a synchronization signal; and

a sub-processor that receives the synchronization signal and sets a ripple frequency of a power supply voltage applied to the pixel to deviate from a scanning frequency, which is set to be synchronized with the synchronization signal, by a predetermined reference ratio or more.