KR102107567B1 - Display device and driving method for the same - Google Patents

Abstract

A display device is provided. The display device includes a display unit including a first display area displaying an image of one resolution and a second display area displaying an image of a second resolution lower than the first resolution, and first image data corresponding to the first display area And a timing controller outputting third image data including second image data corresponding to the second display area, and a first data voltage corresponding to the first image data among the third image data corresponding to a first clock. And a data driver for generating a second data voltage corresponding to the second image data corresponding to a second clock having a frequency lower than the frequency of the first clock.

Description

Display device and driving method thereof {DISPLAY DEVICE AND DRIVING METHOD FOR THE SAME}

The present invention relates to a display device and a driving method thereof.

The display device may include a display panel on which an image is displayed and a driving unit for driving the display panel. Types of the display panel may include various types such as a liquid crystal display panel, a plasma display panel, an electrophoretic display panel, and an electroluminescent display panel, and the type of the display device may vary depending on the type of the display panel.

The driving unit may include a timing control unit, a data driving unit, and a scan driving unit. The timing control unit may control the data driving unit and the scan driving unit in response to information on an image provided from the outside. The data driver may generate a data voltage controlling a gray level displayed on each of a plurality of pixels included in the display panel and provide the data voltage to the display panel. The scan driver may generate a scan signal that controls whether a data signal is transmitted to each of the plurality of pixels and provides the scan signal to the display panel.

The data driver may transmit the generated data voltage through the data line of the display panel. However, as the display device becomes larger and the resolution increases, the number of such data lines increases, and accordingly, power consumption of the display device may increase.

Accordingly, an object of the present invention is to provide a display device capable of reducing power consumption while providing substantially the same display quality.

In addition, another problem to be solved by the present invention is to provide a method of driving a display device capable of reducing power consumption while providing substantially the same display quality.

The problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

A display device according to an exemplary embodiment of the present invention for solving the above-described problem includes a first display area displaying an image of one resolution and a second display area displaying an image of a second resolution lower than the first resolution. The display unit, a timing controller outputting third image data including first image data corresponding to the first display region and second image data corresponding to the second display region, and the first image among the third image data Data generated by generating a first data voltage corresponding to data corresponding to a first clock, and generating a second data voltage corresponding to the second image data corresponding to a second clock having a frequency lower than the frequency of the first clock It includes a driving unit.

Here, the first resolution is n ^ 2 times the second resolution, the frequency of the first clock is n times the frequency of the second clock, and n can be a natural number of 2 or more.

Here, the timing control unit generates the third image data in response to a resolution conversion unit for converting the first image data into the second image data and a setting signal for setting the first display area and the second display area. It may include a data correction unit.

Further, the first on voltage may be a gate voltage corresponding to a saturation region of the thin film transistor, and the second on voltage may be a gate voltage corresponding to a linear region of the thin film transistor.

The display unit includes at least one pixel block in the form of an nxn matrix, and the resolution converter corrects the gradation values of the pixels of the pixel block to the average gradation values of the pixel blocks to convert the first image data to the second image data. Can be converted to

The display area setting unit may output a setting signal for setting the first display area and the second display area according to a user's gaze.

The apparatus may further include a display area setting unit that compares the image data of the current frame with the image data of the previous frame and outputs a setting signal for setting the first display area and the second display area.

The data driving unit provides the first data driving unit to provide the first image data corresponding to the first clock and the second image data to the second display region corresponding to the second clock. It may include a second data driving unit.

Further comprising a light source unit for providing light to the display unit, the light source unit provides light of different intensities for each area of the display unit, and the intensity of the light provided in the first display area is the light provided in the second display area. Can be greater than a century.

A method of driving a display device according to an exemplary embodiment of the present invention for solving the other problems includes a first display area displaying an image of a first resolution and a second displaying image of a second resolution lower than the first resolution. A method of driving a display device including a display unit including a display area, the method comprising: displaying first image data displayed on the first display area and third image data including second image data displayed on the second display area; Outputting and generating a first data voltage corresponding to the first image data corresponding to a first clock, and generating a second data voltage corresponding to the second image data having a frequency lower than the frequency of the first clock And generating in response to two clocks.

Here, the first resolution is n ^ 2 times the second resolution, the frequency of the first clock is n times the frequency of the second clock, and n can be a natural number of 2 or more.

The third image data output step may correspond to a resolution conversion step of converting the first image data into the second image data and a setting signal for setting the first display area and the second display area. It may include the step of generating.

The method may further include comparing image data of the current frame with image data of the previous frame and outputting a setting signal for setting the first display area and the second display area.

The method may further include outputting a setting signal for setting the first display area and the second display area according to a user's gaze.

The display unit includes at least one pixel block in the form of an nxn matrix, and the resolution conversion step corrects the gradation values of the pixels of the pixel block to the average gradation values of the pixel block to convert the first image data to the second image. Can be converted to data.

The method may further include providing light to the display unit, wherein the providing of light provides light of different intensities for each region of the display unit, and intensity of light provided to the first display region is provided to the second display region. Can be greater than the intensity of the light.

Details of other embodiments are included in the detailed description and drawings.

According to embodiments of the present invention has at least the following effects.

That is, power consumption can be improved.

In addition, the effect of increasing the presence of the bar can be improved, and the display quality can be improved.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a block diagram of a display device according to an exemplary embodiment of the present invention.
2 is a block diagram of a timing control unit according to an embodiment of the present invention.
3 is a block diagram of a data conversion unit according to an embodiment of the present invention.
4 is a schematic diagram showing a resolution conversion process.
5 is a schematic diagram showing third image data.
6 is a block diagram of a data driver according to an embodiment of the present invention.
7 is a schematic diagram showing the relationship between the first clock and the second clock.
8 is a schematic diagram showing a relationship between an embedded first data voltage and a second data voltage.
9 is a block diagram of a display device according to another exemplary embodiment of the present invention.
10 is a block diagram of a data conversion unit according to another embodiment of the present invention.
11 is a flowchart of a method of driving a display device according to another embodiment of the present invention.
12 is a flowchart of the step of outputting the corrected image data.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and the ordinary knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims.

In this specification, the same reference numeral refers to the same configuration.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are only used to distinguish one component from another component. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical spirit of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a display device according to an embodiment of the present invention, FIG. 2 is a block diagram of a timing controller according to an embodiment of the present invention, and FIG. 3 is a data conversion unit according to an embodiment of the present invention It is a block diagram, and FIG. 4 is a schematic diagram showing a resolution conversion process, and FIG. 5 is a schematic diagram showing third image data.

1 and 5, the display device 10 includes a display unit 110, a timing control unit 120, a data driving unit 130, and a scan driving unit 140.

The display 110 may be an area in which an image is displayed. The display unit 110 includes a plurality of scan lines SL1, SL2, ..., SLn, and a plurality of data lines DL1, DL2, .. that intersect the plurality of scan lines SL1, SL2, ..., SLn. ., DLm) and one of the plurality of scan lines SL1, SL2, ..., SLn, and one of the plurality of data lines DL1, DL2, ..., DLm, and a plurality of pixels PX respectively connected ). The plurality of scan lines SL1, SL2, ..., SLn may have a shape extending in the first direction D1, and may be substantially parallel to each other. The plurality of scan lines SL1, SL2, ..., SLn may include first to nth scan lines SL1, SL2, ..., SLn arranged in order. Each of the plurality of data lines DL1, DL2, ..., DLm may intersect the plurality of scan lines SL1, SL2, ..., SLn. That is, the plurality of data lines DL1, DL2, ..., DLm may have a shape extending in a second direction D2 perpendicular to the first direction D1, and may be substantially parallel to each other. Here, the first direction D1 may correspond to the row direction and the second direction D2 may correspond to the column direction. The plurality of pixels PX may be arranged in a matrix shape, but is not limited thereto. Each of the plurality of pixels PX may be connected to one of the plurality of scan lines SL1, SL2, ..., SLn and one of the plurality of data lines DL1, DL2, ..., DLm. Each of the plurality of pixels PX is connected to the scan signals S1, S2, ..., Sn provided from the connected scan lines SL1, SL2, ..., SLn, and the data lines DL1, DL2,. .., DLm).

The display unit 110 may include a first display area 110a and a second display area 110b. As illustrated in FIG. 1, the first display area 110a may be disposed between the second display areas 110b. However, the range and position of the first display area 110a and the second display area 110b are not limited thereto. The first display area 110a and the second display area 110b may be set in consideration of the viewing distance, viewing direction, and field of view based on the user of the display device 10. That is, the first display area 110a may be an area corresponding to the front of the user, and may be a main viewing area within the user's field of view. The second display area 110b may be an auxiliary viewing area outside the user's field of view. The range and position of the first display area 110a and the second display area 110b may be in a preset state, but are not limited thereto, and the first display area 110a and the second display area 110b in some embodiments are not limited thereto. The range and position can be changed by the signal of the user or system.

The display 110 may display one image. That is, the first display area 110a and the second display area 110b may be displayed by dividing one image. However, an image displayed in the first display area 110a and an image displayed in the second display area 110b may have different resolutions. That is, the first display area 110a may display an image of the first resolution, and the second display area 110b may display an image of the second resolution. Here, the second resolution may be lower than the first resolution. In an exemplary embodiment, the first resolution is 3840X2160, the second resolution is 1920X1080, and the first resolution may be four times the second resolution. The second viewing area 110b as the secondary viewing area is displayed at the second resolution, but the first viewing area 110a as the primary viewing area is displayed at the first resolution, so that the user of the display device 110 is substantially the first You can watch the resolution video. That is, the display unit 110 includes regions having different resolutions, but the first display region corresponding to the main viewing region maintains high resolution, so that the display quality perceived by the viewer is substantially the same as other display devices. can do.

The timing controller 120 receives a timing control signal (TCS) from an external system and receives a data control signal (DCS) for controlling the data driver 130 and a scan control signal (SCS) for controlling the scan driver 140. Can be created. The timing control signal TCS may be a clock signal CLK, a horizontal synchronization signal Hsync, and a vertical synchronization signal Vsync.

Also, the timing control unit 120 may receive the first image data DATA1 and output the corrected third image data DATA3. More specifically, as illustrated in FIG. 2, the timing control unit 120 may include a data conversion unit 121, a data control signal generation unit 122, and a scan control signal generation unit 123. Can be.

The data conversion unit 121 may include a resolution conversion unit 121a and a data correction unit 121b. As illustrated in FIG. 3, the first image data DATA1 may be input to both the resolution converter 121a and the data correction unit 121b. Here, the first image data DATA1 may be raw image data provided from the outside, or may be image data corresponding to the first resolution. The resolution converter 121a may convert the first image data DATA1 into second image data DATA2. The second image data DATA2 may be image data having a reduced resolution compared to the first image data DATA1. That is, the resolution converter 121a may generate the low-resolution second image data DATA2 by performing the data averaging process of the high-resolution first image data DATA1.

The display unit 110 may include at least one pixel block PB in the form of an n x n matrix. As illustrated in FIG. 4, the pixel block PB may be in the form of a 2 x 2 matrix composed of first to fourth pixels PX1, ..., PX4, but is not limited thereto. The resolution converter 121a may correct the grayscale values of the pixels PX1, ..., PX4 of the pixel block PB to the average grayscale values of the pixels PX1, ..., PX4. That is, the grayscale values input to the first to fourth pixels PX1, ..., PX4 based on the first image data DATA1 may be D1, ..., D4, and the average grayscale of the grayscale values The value can be Da. The resolution converter 121a may generate the second image data DATA2 by converting the gradation values input to the first to fourth pixels PX1, ..., PX4 to Da. That is, the pixel blocks PB of the second image data DATA2 can express the same grayscale value, which can be regarded as one new pixel. Since the second image data DATA2 is newly defined as a pixel block (B) unit, resolution may be reduced compared to the first image data DATA1. As illustrated in FIG. 4, if data averaging is performed using four pixel pixels PBs, second image data having a resolution corresponding to 1/4 of the first image data DATA1 ( DATA2) can be created. The resolution converter 121a may output the generated second image data DATA2 to the data correction unit 121b.

The first image data DATA1 and the second image data DATA2 may be input to the data correction unit 121b. The data compensator 121b combines the first image data DATA1 and the second image data DATA2 so as to correspond to the first display area 110a and the second display area 110b of the display area 110, respectively. Can be. That is, as illustrated in FIG. 5, the third image data DATA3 may include first image data DATA1 and second image data DATA2, and the first image data DATA1 is the first display. The data may be input to the region 110a, and the second image data DATA2 may be data input to the second display region 110b. That is, as described above, the first display area 110a may display first image data DATA1 having high resolution, and the second display area 110b may display second image data DATA2 having low resolution. have.

The data control signal generator 122 may receive the clock signal CLK and the horizontal synchronization signal Hsync, and output the data control signal DCS to the data driver 130. The data control signal DCS may be, for example, a source start pulse (SSP) and a source sampling clock (SSC). Here, the source sampling clock SSC may include a first clock SSC1 and a second clock SSC2 having different frequencies. This will be described later in more detail.

The scan control signal generation unit 123 may receive the clock signal CLK and the vertical synchronization signal Vsync, and output the scan control signal SCS to the scan driver 120. The scan control signal SCS may be a gate start pulse (GSP) and a gate sampling clock (GSC).

Referring back to FIG. 1, the scan driver 140 receives the scan control signal SCS and correspondingly outputs a plurality of scan signals S1, S2, ..., Sn to the display unit 110. have. The plurality of scan signals S1, S2, ..., Sn are turned on by turning on a thin film transistor of each pixel through a plurality of scan lines SL1, SL2, ..., SLn connected to each other. )can do.

The data driving unit 130 may receive the data control signal DCS and the third image data DATA3 from the timing control unit 120, and output a data voltage based on the data control signal DCS. The data voltage may be input through the source terminal of each turn-on thin film transistor through the data lines DL1, DL2 ..., DLm. Hereinafter, the data driver 130 will be described in more detail with reference to FIGS. 6 to 8.

FIG. 6 is a block diagram of a data driver according to an embodiment of the present invention, FIG. 7 is a schematic diagram showing a relationship between a first clock and a second clock, and FIG. 8 is a diagram of embedded first data voltage and second data voltage It is a schematic diagram showing the relationship.

6 to 8, the data driver 130 may include a first data driver 131a and a second data driver 131b. The first data driver 131a may output first data voltages HD1, HD2, ..., HDm corresponding to the first image data DATA1 among the third image data DATA3, and the second data The driver 131b may output second data voltages LD1, LD2, ..., LDm corresponding to the second image data DATA among the third image data DATA3. The first data driver 131a and the second data driver 131b may receive the source start pulse SSP and the second image data DATA3, respectively.

However, in the first data driver 131a, the first clock SSC1 may be input as a source sampling clock, and the second data driver 131b may have a second clock SSC2 having a lower frequency than the first clock SSC1. Can be input as the source sampling clock. That is, the first data driver 131a may output a first sampling signal by shifting the source start pulse SSP in response to the first clock SSC1, and the second data driver 131b may include a second clock ( The second sampling signal may be output by shifting the source start pulse SSP in response to SSC2). In addition, the first data driver 131a may sample and latch the first image data DATA1 among the third image data DATA3 in response to the first sampling signal, and the gamma voltage generator (not shown) The first data voltages HD1, HD2, ..., HDm may be generated based on the output gamma reference voltage. The second data driver 131b may sample and latch the second image data DATA2 among the third image data DATA3 in response to the second sampling signal, and is output from the gamma voltage generator (not shown). The second data voltages LD1, LD2, ..., LDm may be generated based on the gamma reference voltage.

Here, the first data voltages HD1, HD2, ..., HDm may be provided to the first display area 110a, and the second data voltages HL1, HL2, ..., HLm may be provided to the second display area. It may be provided in (110b). The data voltage corresponding to the first clock SSC1 may be applied to the first display area 110a, and the data voltage corresponding to the second clock force SSC2 may be applied to the second display area 110b.

Here, the resolution relationship between the first display area 110a and the second display area 110b and the frequency relationship between the first clock SSC1 and the second clock SSC2 may correspond. That is, when the first resolution of the first display area 110a is n ^ 2 times the second resolution of the second display area 110b, the frequency of the first clock SSC1 is the frequency of the second clock SSC2. It can be n times. As illustrated in FIG. 7, when the first resolution is four times the second resolution, the frequency of the first clock SSC1 may be twice the frequency of the second clock SSC2. Here, the power required to provide the second clock SSC2 having a low frequency may be lower than the power required to provide the first clock SSC1, and accordingly, power consumption may be reduced. That is, the display device 10 according to the exemplary embodiment of the present invention has a second data voltage (HL1, HL2, ..., HLm) provided in the second display area 110b corresponding to the low-resolution area having a low frequency. Since it can be generated in correspondence with the two clocks SSC2, power consumption can be reduced. In addition, as described above, even if the second display area 110b displays an image with a low resolution, since it corresponds to the auxiliary viewing area, the display quality experienced by the user may be substantially the same. That is, the display device 10 according to an exemplary embodiment of the present invention can reduce power consumption while providing substantially the same display quality.

In addition, in some embodiments, the data voltage may be an embedded form in which a clock signal and a data voltage are merged as illustrated in FIG. 8. The number of packets consumed for transmitting image data in the packet of the first data voltage HD1 provided in the first display area 110a having a high resolution is the second data voltage provided in the second display area 110b having a low resolution. It may be twice the number of packets consumed for transmitting image data in the packet of (HL1). That is, the remaining packets of the second data voltage HL1 may be in a blank state, and accordingly power consumed may be reduced.

Hereinafter, a display device according to another exemplary embodiment of the present invention will be described. In the following embodiments, the same configurations as those already mentioned are omitted or simplified, and the differences are mainly described.

9 is a block diagram of a display device according to another embodiment of the present invention, and FIG. 10 is a block diagram of a data conversion unit according to another embodiment of the present invention.

9 to 10, the display device 20 according to another exemplary embodiment of the present invention further includes a display area setting unit 250 and a light source unit 260 compared to the display device 10 of FIGS. 1 to 8. Included, the data correction unit 221b of the display device 20 may generate the third image data DATA3 in response to the setting signal DS provided from the display area setting unit 250. That is, the data correction unit 221b may generate the third image data DATA3 to correspond to the first display area 210a and the second display area 210b set by the setting signal DS. In addition, the data correction unit 221b may generate a light source control signal LCS in response to the set signal DS, and may output the light source control signal LCS to the light source unit 260.

The display area setting unit 250 may set the position and range of the first display area 210a and the second display area 210b in the display unit 210, and the data correction unit ( 221b). The display area setting unit 250 may set the first display area 210a and the second display area 210b by the user's gaze. That is, a sensor (not shown) capable of recognizing a user's gaze may be formed on one surface of an image displayed on the display unit 210. The sensor may photograph the user's pupil whose information of the image displayed on the display unit 210 is reflected, and estimate the user's gaze direction based on the user's pupil shooting information and the image information of the display unit 210. The sensor may provide data for estimating the gaze direction to the display area setting unit 250, and based on this, the display area setting unit 250 may include a first display area corresponding to a main viewing area in which the user's gaze mainly stays ( The location and range of the second display area 210b corresponding to 210a) and the auxiliary viewing area may be respectively set, and a corresponding setting signal DS may be provided to the data correction unit 221b.

However, the method of setting the display area is not limited thereto, and the display area setting unit 250 in some embodiments compares the first image data DATA1 of the current frame and the first image data of the previous frame, and thus the amount of change of data is large. An area corresponding to a video may be set as the first display area 210a, and an area corresponding to a still image having a small amount of change in data may be set as the second display area 210b.

The light source unit 260 may provide light L to the display unit 210. Here, the display device 20 may be a liquid crystal display (LCD), and the display unit 210 may be a liquid crystal panel that does not emit light and transmits back light. The light source unit 260 may provide light having different intensities for each region of the display unit 210. The light source unit 260 includes a light emitting block (not shown) corresponding to each pixel PX of the display unit 210 and can independently control the light emission level of each light emitting block (not shown). That is, the data correction unit 221b may provide the light emission control signal LCS to the light source unit 260, and accordingly, the light emission intensity for each light emission block may be adjusted.

Here, the light emission control signal LCS of this embodiment may be a signal that controls the first display area 110a and the second display area 110b to provide light having different intensities. That is, the data correction unit 221b controls a light emission control signal to provide light having different intensities to areas corresponding to the first display area 110a and the second display area 110b set by the setting signal DS. (LCS) may be provided to the light source unit 260. The light source unit 260 provides the first light L1 to the first display area 110a and the second light L2 having a weaker intensity than the first light L to the second display area 110b. Can be. That is, weaker light may be provided to the second display area 110b corresponding to the auxiliary viewing area, and accordingly, power consumption may be reduced. In addition, since the weaker light is provided from the first display area 110a which is the main viewing area to the second display area 110b which is the secondary viewing area, the display image may become darker toward the side of the display surface 210. Accordingly, the tension of the display image can be improved. That is, the display device 20 according to another embodiment of the present invention can not only provide a higher display quality but also reduce power consumption.

Other descriptions of the components included in the display device 20 are substantially the same as the descriptions having the same name included in the display device 10 of FIGS. 1 to 8 and will be omitted.

Hereinafter, a method of driving a display device according to another embodiment of the present invention will be described.

11 is a flowchart of a method of driving a display device according to another embodiment of the present invention, and FIG. 12 is a flowchart of a step of outputting corrected image data.

11 and 12, a method of driving a display device according to another exemplary embodiment of the present invention includes a first display area 110a displaying an image of a first resolution and a second resolution lower than the first resolution. A method of driving a display device including a display unit 110 including a second display area 110b displaying an image, the method comprising: outputting third image data (S110) and generating data voltages for each display region (S120).

First, the third image data is output (S110).

The display unit 110 may display one image, and may include a first display area 110a and a second display area 110b. That is, the first display area 110a and the second display area 110b may be displayed by dividing one image. However, an image displayed in the first display area 110a and an image displayed in the second display area 110b may have different resolutions. That is, the first display area 110a may display an image of the first resolution, and the second display area 110b may display an image of the second resolution. Here, the second resolution may be lower than the first resolution. Also, the first display area 110a may be an area corresponding to the front of the user, and may be a main viewing area within the user's field of view. In addition, the second display area 110b may be an auxiliary viewing area outside the user's field of view. The second viewing area 110b as the secondary viewing area is displayed at the second resolution, but the first viewing area 110a as the primary viewing area is displayed at the first resolution, so that the user of the display device 110 is substantially the first You can watch the resolution video. That is, the display unit 110 includes regions having different resolutions, but the first display region corresponding to the main viewing region maintains high resolution, so that the display quality perceived by the viewer is substantially the same as other display devices. can do.

The timing controller 120 may receive the first image data DATA1 and convert it to generate the second image data DATA2, and the first image data DATA1 corresponds to the first display area 110a. The combined third image data DATA3 may be generated such that the second image data DATA2 corresponds to the second display area 110b. The timing controller 120 may output the generated third image data DATA3 to the data driver 120.

In more detail, the third image data output step S110 may include a resolution conversion step S112 and a third image data generation step S114. That is, the timing control unit 120 may include a resolution conversion unit 121a and a data correction unit 121b, and after the resolution conversion step S112 is performed in the resolution conversion unit 121a, the data correction unit 121b In step S114, the third image data DATA3 is generated.

The first image data DATA1 may be input to both the resolution converter 121a and the data correction unit 121b. Here, the first image data DATA1 may be raw image data provided from the outside, or may be image data corresponding to the first resolution. The resolution converter 121a may convert the first image data DATA1 into second image data DATA2. The second image data DATA2 may be image data having a reduced resolution compared to the first image data DATA1. That is, the resolution converter 121a may generate low-resolution second image data DATA2 by data averaging the high-resolution first image data DATA1. Here, the data averaging process is substantially the same as the description in the display device 10, so that it is omitted.

The first image data DATA1 and the second image data DATA2 may be input to the data correction unit 121b. The data compensator 121b combines the first image data DATA1 and the second image data DATA2 so as to correspond to the first display area 110a and the second display area 110b of the display area 110, respectively. Can be. The third image data DATA3 may include first image data DATA1 and second image data DATA2, and the first image data DATA1 may be data input to the first display area 110a. The second image data DATA2 may be data input to the second display area 110b. The data correction unit 121b may output the generated third image data DATA3 to the data driver 130.

In addition, the timing control unit 120 may generate a data control signal DCS and output it to the data providing unit 130. The data control signal DCS may be a source start pulse SSP and a source sampling clock SSC, and the source sampling clock SSC may be lower than the first clock SSC1 and the first clock SSC1. A second clock SSC2, which is a frequency, may be included.

Subsequently, a data voltage for each display area is generated (S120).

The data driver 130 may receive the third image data DATA3, and output a data voltage based on this. In more detail, the data driver 130 may include a first data driver 131a and a second data driver 131b. The first data driver 131a may output first data voltages HD1, HD2, ..., HDm corresponding to the first image data DATA1 among the third image data DATA3, and the second data The driver 131b may output second data voltages LD1, LD2, ..., LDm corresponding to the second image data DATA among the third image data DATA3. The first data driver 131a and the second data driver 131b may receive the source start pulse SSP and the second image data DATA3, respectively.

However, in the first data driver 131a, the first clock SSC1 may be input as a source sampling clock, and the second data driver 131b may have a second clock SSC2 having a lower frequency than the first clock SSC1. Can be input as the source sampling clock. That is, the first data driver 131a may output a first sampling signal by shifting the source start pulse SSP in response to the first clock SSC1, and the second data driver 131b may include a second clock ( The second sampling signal may be output by shifting the source start pulse SSP in response to SSC2). In addition, the first data driver 131a may sample and latch the first image data DATA1 among the third image data DATA3 in response to the first sampling signal, and the gamma voltage generator (not shown) The first data voltages HD1, HD2, ..., HDm may be generated based on the output gamma reference voltage. The second data driver 131b may sample and latch the second image data DATA2 among the third image data DATA3 in response to the second sampling signal, and is output from the gamma voltage generator (not shown). The second data voltages LD1, LD2, ..., LDm may be generated based on the gamma reference voltage.

Here, the first data voltages HD1, HD2, ..., HDm may be provided to the first display area 110a, and the second data voltages HL1, HL2, ..., HLm may be provided to the second display area. It may be provided in (110b). The data voltage corresponding to the first clock SSC1 may be applied to the first display area 110a, and the data voltage corresponding to the second clock SSC2 may be applied to the second display area 110b.

Here, the resolution relationship between the first display area 110a and the second display area 110b and the frequency relationship between the first clock SSC1 and the second clock SSC2 may correspond. That is, when the first resolution of the first display area 110a is n ^ 2 times the second resolution of the second display area 110b, the frequency of the first clock SSC1 is the frequency of the second clock SSC2. It can be n times. As illustrated in FIG. 7, when the first resolution is four times the second resolution, the frequency of the first clock SSC1 may be twice the frequency of the second clock SSC2. Here, the power required to provide the second clock SSC2 having a low frequency may be lower than the power required to provide the first clock SSC1, and accordingly, power consumption may be reduced.

That is, in the driving method of the display device according to the present exemplary embodiment, the second clock having a low frequency of the second data voltages HL1, HL2, ..., HLm provided to the second display area 110b corresponding to the low resolution area Since it can be generated corresponding to (SSC2), power consumption can be reduced. In addition, as described above, even if the second display area 110b displays an image with a low resolution, since it corresponds to the auxiliary viewing area, the display quality experienced by the user may be substantially the same. The driving method of the display device according to the present exemplary embodiment may reduce power consumption while providing substantially the same display quality.

In addition, in some embodiments, the driving method of the display device may further include setting the first display area 110a and the second display area 110b. The display area setting step may be after the resolution conversion step (S112) and before the third image data generation step (S114), but is not limited thereto.

The range and position of the first display area 110a and the second display area 110b may be set by comparing image data of a current frame with image data of a previous frame. However, the present invention is not limited thereto, and the range and position of the first display area 110a and the second display area 110b may be set by a user's gaze.

Furthermore, in some embodiments, a method of driving a display device may further include providing light to the display unit 110. Here, the display device may be a liquid crystal display device. The light providing step may provide light having different intensities for each area to the display unit 110, and the intensity of light provided to the first display area 110a is greater than the intensity of light provided to the second display area 110b. Can be. That is, weaker light may be provided to the second display area 110b corresponding to the auxiliary viewing area, and accordingly, power consumption may be reduced. In addition, since the weaker light is provided from the first display area 110a which is the main viewing area to the second display area 110b which is the secondary viewing area, the display image may become darker toward the side of the display surface 210. Accordingly, the tension of the display image can be improved.

Other descriptions of the components included in the driving method of the display device are substantially the same as the descriptions having the same name included in the display device 10 of FIGS. 1 to 8 and thus will be omitted.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, a person skilled in the art to which the present invention pertains may be implemented in other specific forms without changing the technical spirit or essential features of the present invention. You will understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

110, 210: display
120, 220: scan driver
130, 230: data driver
140, 240: timing control
150, 250: voltage generator
10, 20: organic light emitting display device

Claims (15)

A display unit including a first display area displaying an image of a first resolution and a second display area displaying an image of a second resolution lower than the first resolution;
A timing control unit outputting third image data including first image data corresponding to the first display region and second image data corresponding to the second display region; And
A first data voltage corresponding to the first image data among the third image data is generated corresponding to a first clock, and a second data voltage corresponding to the second image data is lower than a frequency of the first clock And a data driver that is generated corresponding to the second clock,
The timing control unit converts the first image data to generate the second image data, such that the first image data corresponds to the first display area, and the second image data corresponds to the second display area. A display device that generates the third image data by combining the first image data and the second image data. According to claim 1,
The first resolution is n ^ 2 times the second resolution,
The frequency of the first clock is n times the frequency of the second clock,
The n is a natural number display device of 2 or more. According to claim 1,
The timing control unit converts the first image data to the second image data, and a resolution conversion unit.
And a data correction unit generating the third image data in response to a set signal for setting the first display area and the second display area. According to claim 3,
The display unit includes at least one pixel block in the form of an nxn matrix,
The resolution converter converts the first image data into the second image data by correcting the gradation values of the pixels of the pixel block to the average gradation values of the pixel block. According to claim 3,
And a display area setting unit configured to output setting signals for setting the first display area and the second display area according to a user's gaze. According to claim 3,
And a display area setting unit configured to compare the video data of the current frame with the video data of the previous frame and output a setting signal for setting the first display area and the second display area. According to claim 1,
The data driving unit provides the first data driving unit to provide the first image data corresponding to the first clock, and the second image data to the second display region in response to the second clock. A display device comprising a second data driver. According to claim 1,
Further comprising a light source for providing light to the display unit,
The light source unit provides light of different intensities for each region of the display unit,
A display device having an intensity of light provided on the first display area greater than an intensity of light provided on the second display area. A method of driving a display device including a display unit including a first display area displaying an image of a first resolution and a second display area displaying an image of a second resolution lower than the first resolution, the method comprising:
Outputting third image data including first image data displayed on the first display area and second image data displayed on the second display area; And
A first data voltage corresponding to the first image data is generated corresponding to a first clock, and a second data voltage corresponding to the second image data is corresponding to a second clock having a frequency lower than the frequency of the first clock. It includes the steps to generate,
The step of outputting the third image data,
The first image is generated by converting the first image data to generate the second image data, the first image data corresponding to the first display area, and the second image data corresponding to the second display area. A method of driving a display device that generates the third image data by combining data with the second image data. The method of claim 9,
The first resolution is n ^ 2 times the second resolution,
The frequency of the first clock is n times the frequency of the second clock,
The n is a driving method of a display device having a natural number of 2 or more. The method of claim 9,
The third image data output step may include converting the first image data into the second image data and converting the resolution.
And generating the third image data in response to a setting signal for setting the first display area and the second display area. The method of claim 11,
And comparing the image data of the current frame with the image data of the previous frame and outputting a setting signal for setting the first display area and the second display area. The method of claim 11,
And outputting a setting signal for setting the first display area and the second display area according to a user's gaze. The method of claim 11,
The display unit includes at least one pixel block in the form of an nxn matrix,
In the converting of the resolution, a method of driving a display device that converts the first image data into the second image data by correcting the gradation values of pixels in the pixel block to the average gradation values of the pixel block. The method of claim 9,
Further comprising the step of providing light to the display unit,
The light providing step provides light of different intensities for each region of the display unit,
A method of driving a display device in which the intensity of light provided in the first display area is greater than the intensity of light provided in the second display area.

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