KR102521364B1 - Display apparatus and method of driving the same - Google Patents

Abstract

The display device includes an image analyzer that analyzes a first image having a first luminance range based on input image data, a luminance range determiner that determines a second luminance range based on a result of analyzing the first image, and the input image data. An image processor generating first image data based on image data and the second luminance range, a light source unit emitting first light based on the second luminance range, and generating first data voltages based on the first image data. and a display panel configured to display a second image corresponding to the first image and having the second luminance range based on the first light and the first data voltages.

Description

Display device and its driving method {DISPLAY APPARATUS AND METHOD OF DRIVING THE SAME}

The present invention relates to a display device and a driving method thereof, and more particularly, to a display device capable of improving display quality and a driving method thereof.

In general, a liquid crystal display device includes a first substrate including a pixel electrode, a second substrate including a common electrode, and a liquid crystal layer interposed between the substrates. A desired image is obtained by applying a voltage to the two electrodes to generate an electric field in the liquid crystal layer, and adjusting the transmittance of light passing through the liquid crystal layer by adjusting the strength of the electric field.

A liquid crystal display device includes a display panel and a panel driver. The display panel includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels connected to the gate lines and the data lines. The panel driver includes a gate driver for providing gate signals to the gate lines and a data driver for providing data voltages to the data lines.

Therefore, the technical problem of the present invention has been focused on this point, and an object of the present invention is to provide a display device that improves display quality.

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

A display device according to embodiments for realizing the object of the present invention described above includes an image analyzer that analyzes a first image having a first luminance range based on input image data, and a result of analyzing the first image. a luminance range determining unit configured to determine a second luminance range; an image processing unit configured to generate first image data based on the input image data and the second luminance range; and emitting a first light based on the second luminance range. A light source unit, a data driver generating first data voltages based on the first image data, and a second light source corresponding to the first image and having the second luminance range based on the first light and the first data voltages. A display panel displaying an image is included.

In one embodiment of the present invention, the image analyzer may analyze first metadata included in the input image data and related to the first image.

In one embodiment of the present invention, the first metadata may include information about at least one of a color coordinate, a maximum luminance, and a minimum luminance of the first image.

In one embodiment of the present invention, the image analyzer may analyze the first image by generating a first histogram of the first image based on the input image data.

In an embodiment of the present invention, the first histogram may be a histogram of at least one of luminance, color, saturation, and brightness of the first image.

In one embodiment of the present invention, the image analysis unit may include a still image determination unit for determining whether the first image is a still image or a moving image.

In one embodiment of the present invention, if the first image is the moving picture, the first final luminance range may be the same as the first luminance range.

In one embodiment of the present invention, the luminance range determiner may determine the second luminance range by comparing the first luminance range with a limit luminance range that can be provided by the light source unit.

In one embodiment of the present invention, when the first luminance range is greater than the limit luminance range, the second luminance range may be smaller than the first luminance range.

In one embodiment of the present invention, when the first luminance range is less than or equal to the limit luminance range, the second luminance range may be greater than or equal to the first luminance range.

In an embodiment of the present invention, the image analysis unit further analyzes a third image having the first luminance range based on the input image data, and the luminance range determination unit analyzes the third image based on a result of analyzing the third image. To further determine a third luminance range different from the second luminance range, the image processing unit further generates second image data based on the input image data and the third luminance range, and the light source unit generates the third luminance range. The data driver further generates second data voltages based on the second image data, and the display panel emits second light based on the second light and the second data voltages. A fourth image corresponding to the third image and having the third luminance range may be further displayed.

In an embodiment of the present invention, the image processing unit may generate the first image data based on a first gamma and further generate the second image data based on a second gamma different from the first gamma. there is.

In one embodiment of the present invention, a light source control unit for controlling an operation of the light source unit is further included, the light source unit includes a plurality of light source blocks, and the light source control unit controls each of the light source blocks within the second luminance range. can be independently controlled.

In one embodiment of the present invention, the light source controller may control each of the light source blocks based on a representative luminance of a partial image corresponding to each of the light source blocks in the second image.

In an embodiment of the present invention, the representative luminance of the partial image may be the average luminance of the partial image.

A method of driving a display device according to embodiments for realizing the above object of the present invention includes analyzing a first image having a first luminance range based on input image data, and a result of analyzing the first image. Determining a second luminance range based on , generating first image data based on the input image data and the second luminance range, and generating the first image data based on the second luminance range and the first image data. and displaying a second image corresponding to the first image and having the second luminance range.

In one embodiment of the present invention, analyzing the first image may include analyzing first metadata included in the input image data and related to the first image.

In one embodiment of the present invention, the analyzing of the first image may include generating a first histogram of the first image based on the input image data.

In an embodiment of the present invention, analyzing the first image may include determining whether the first image is a still image or a moving image.

In one embodiment of the present invention, the determining of the second luminance range may include comparing the first luminance range with a limit luminance range that can be provided by the light source unit.

According to the display device and its driving method according to embodiments of the present invention, the luminance range of the input image is appropriately converted according to the type of the input image. In addition, in converting the luminance range, display performance of a light source and a display panel is also considered. Accordingly, the display quality of the display device can be improved.

1 is a block diagram illustrating a display device according to example embodiments.
2 is a block diagram illustrating a timing controller included in a display device according to example embodiments.
3A is a diagram illustrating an example of metadata included in input image data input to a display device according to embodiments of the present invention.
3B is a diagram illustrating an example of a histogram generated based on input image data input to a display device according to embodiments of the present invention.
4 is a block diagram illustrating an image analyzer included in a display device according to example embodiments.
5A to 5C are diagrams showing histograms of images input to a display device according to embodiments of the present invention and images converted according to embodiments of the present invention.
6 is a block diagram illustrating a control signal generator included in a display device according to example embodiments.
7 is a block diagram illustrating a light source unit included in a display device according to example embodiments.
8 to 11 are flowcharts illustrating a method of driving a display device according to example embodiments.

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

1 is a block diagram illustrating a display device according to example embodiments.

Referring to FIG. 1 , the display device includes a display panel 100 and a panel driver. The panel driver includes a timing controller 200, a gate driver 300, a gamma reference voltage generator 400, a data driver 500, and a light source 600.

The display panel 100 includes a display portion displaying an image and a peripheral portion disposed adjacent to the display portion.

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

Each of the plurality of pixels may include a switching element (not shown), a liquid crystal capacitor (not shown) and a storage capacitor (not shown) electrically connected to the switching element. The pixels are arranged in a matrix form.

The timing controller 200 receives input image data RGB and an input control signal CONT from an external device (not shown). The input image data RGB may include red image data R, green image data G, and blue image data B. The input image data RGB may include metadata about the image. The meta data may include information about at least one of color coordinates, maximum luminance, and minimum luminance of the image. The input control signal CONT may include a master clock signal and a data enable signal. The input control signal CONT may further include a vertical synchronization signal and a horizontal synchronization signal.

The timing controller 200 generates a first control signal CONT1, a second control signal CONT2, a third control signal CONT3, and a second control signal CONT3 based on the input image data RGB and the input control signal CONT. 4 Control signal (CONT4) and data signal (DAT) are generated.

The timing controller 200 generates the first control signal CONT1 for controlling the operation of the gate driver 300 based on the input control signal CONT. The timing controller 200 outputs 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 generates the second control signal CONT2 for controlling the operation of the data driver 500 based on the input control signal CONT. The timing controller 200 outputs the second control signal CONT2 to the data driver 500 . The second control signal CONT2 may include a horizontal start signal and a load signal.

The timing controller 200 generates the data signal DAT based on the input image data RGB. The timing controller 200 outputs the data signal DAT to the data driver 500 .

The timing controller 200 generates the third control signal CONT3 for controlling the operation of the gamma reference voltage generator 400 based on the input control signal CONT. The timing controller 200 outputs the third control signal CONT3 to the gamma reference voltage generator 400 .

The timing controller 200 generates the fourth control signal CONT4 for controlling the operation of the light source unit 600 based on the input image signal RGB and the input control signal CONT. The timing controller 200 outputs the fourth control signal CONT4 to the light source unit 400 .

The configuration and specific operation of the timing controller 200 will be described in detail with reference to FIGS. 2 to 6 .

The gate driver 300 generates gate signals for driving the gate lines GL in response to the first control signal CONT1 received from the timing controller 200 . The gate driver 300 sequentially outputs the gate signals to the gate lines GL.

The gate driver 300 may be directly mounted on the display panel 100 or connected to the display panel 100 in the form of a tape carrier package (TCP). Meanwhile, the gate driver 300 may be integrated into the peripheral portion of the display panel 100 .

The gamma reference voltage generator 400 generates the gamma reference voltage VGREF in response to the third control signal CONT3 received from the timing controller 200 . The gamma reference voltage generator 400 provides the gamma reference voltage VGREF to the data driver 500 . The gamma reference voltage VGREF has a value corresponding to each data signal DAT. The gamma reference voltage VGREF may be a gamma reference voltage based on a plurality of gammas. For example, the gamma reference voltage VGREF may be a gamma reference voltage based on a reference gamma or a gamma reference voltage based on a high dynamic range (HDR) gamma. The gamma reference voltage generator 400 may generate a gamma reference voltage VGREF based on a different gamma for each image.

In an embodiment of the present invention, the gamma reference voltage generator 400 may be disposed within the timing controller 200 or within the data driver 500 .

The data driver 500 receives the second control signal CONT2 and the data signal DAT from the timing controller 200, and generates the gamma reference voltage VGREF from the gamma reference voltage generator 400. receive input The data driver 500 converts the data signal DAT into analog data voltages using the gamma reference voltage VGREF. The data driver 500 outputs the data voltages to the data lines DL.

The data driver 500 may be directly mounted on the display panel 100 or connected to the display panel 100 in the form of a tape carrier package (TCP). Meanwhile, the data driver 500 may be integrated into the peripheral portion of the display panel 100 .

The light source unit 600 receives the fourth control signal CONT4 from the timing controller 200 . The light source unit 600 provides light L to the display panel 100 based on the fourth control signal CONT4 . The light source unit 600 may include a plurality of light source blocks. The light source unit 600 may independently emit light from each of the light source blocks.

The configuration and specific operation of the light source unit 600 will be described in detail with reference to FIG. 7 .

2 is a block diagram illustrating a timing controller included in a display device according to example embodiments. 3A is a diagram illustrating an example of metadata included in input image data input to a display device according to embodiments of the present invention. 3B is a diagram illustrating an example of a histogram generated based on input image data input to a display device according to embodiments of the present invention. 4 is a block diagram illustrating an image analyzer included in a display device according to example embodiments.

1 and 2, the timing controller 200 includes an image analyzer 220, a luminance range determiner 240, an image processor 260, and a control signal generator CONT4.

The image analysis unit 220 receives the input image data RGB. The input image data RGB includes data related to the input image. For example, the input image data RGB may include data related to an HDR high dynamic range (HDR) input image. The image analysis unit 220 analyzes the input image.

The input image data RGB may further include metadata about the input image. The metadata may include information about the input image. For example, the metadata may include information about at least one of color coordinates, maximum luminance, and minimum luminance of the input image. In this case, the image analysis unit 220 may analyze the meta data.

For example, referring to the meta data shown in FIG. 3A, group 1 is information about the color coordinates of the input image, group 2 is information about the white color coordinates of the input image, and group 3 is the maximum luminance of the input image. Group 4 is information about the minimum luminance of the input image, group 5 is information about the luminance of the brightest pixel in the input image, and group 6 is information about the average luminance of the brightest frame in the input image. is information about

The image analyzer 220 may generate a histogram for the input image based on the input image data (RGB). The histogram may be a histogram of at least one of luminance, color, saturation, and lightness of the input image. The image analyzer 220 may analyze the histogram.

For example, referring to the histogram shown in FIG. 3B , X may be at least one of the luminance, the hue, the saturation, and the lightness. For example, the histogram may be a histogram representing the frequency of each luminance of the input image.

That is, the image analyzer 220 may analyze the input image by analyzing meta data of the input image or generating a histogram of the input image. For example, the image analyzer 220 may analyze at least one of a luminance distribution, a color distribution, a saturation distribution, a brightness distribution, a maximum gray level, and a minimum gray level of the input image.

Referring to FIG. 4 , the image analysis unit 220 may include a still image determination unit 221 and an image information analysis unit 222 . The still image determination unit 221 may determine whether the input image is a still image or a moving image. The still image determination unit 221 may output the determination result (P) to the image information analysis unit 222 .

The image analyzer 220 outputs the analysis result (A) to the luminance range determiner 240 .

The image analyzer 220 may independently perform the above operations for each input image.

The luminance range determining unit 240 receives the analysis result (A). The luminance range determination unit 240 determines the luminance range based on the analysis result (A). For example, the luminance range determiner 240 may convert the luminance range of the input image based on the analysis result (A). Alternatively, the luminance range determination unit 240 may maintain the luminance range of the input image based on the analysis result (A).

The luminance range determination unit 240 may determine the luminance range by comparing the luminance range of the input image with a limit luminance range that can be provided by the light source unit 600 . For example, if the luminance range of the input image is greater than the limit luminance range, the luminance range of the input image may be reduced. When the luminance range of the input image is smaller than the threshold luminance range, the luminance range of the input image may be increased.

The luminance range determining unit 240 may maintain the luminance range if the input image is a moving image.

The luminance range determination unit 240 outputs the determination result B to the image processing unit 260 and the control signal generation unit CONT4.

The luminance range determining unit 240 may independently perform the above operations for each input image. That is, the luminance range determining unit 240 may determine different luminance ranges for each input image.

The image processor 260 receives the input image data (RGB) and the determination result (B). The image processor 260 generates the data signal DAT based on the input image data RGB and the determination result B. The data signal DAT includes image data about the output image having the determined luminance range. The image processing unit 260 may rearrange gray levels of the output image according to the determined luminance range and the input image. For example, the output image may be an image with an improved contrast ratio compared to the input image. Alternatively, the output image may be an image maintaining the contrast ratio of the input image.

The image processing unit 260 may independently perform the above operations for each input image. The image processing unit 260 may generate image data based on different gammas for each input image.

The image processor 260 outputs the data signal DAT to the data driver 500 .

Operations of the luminance range determining unit 240 and the image processing unit 260 will be described in detail with reference to FIGS. 5A to 5C.

The control signal generator 280 receives the input image data RGB and the input control signal CONT. The control signal generation unit 280 receives the determination result (B). The control signal generator 280 generates the first control signal CONT1 , the second control signal CONT2 , and the third control signal CONT3 based on the input control signal CONT. The control signal generator 280 generates the fourth control signal CONT4 based on the input image data RGB, the input control signal CONT, and the determination result B. The control signal generation unit 280 outputs the fourth control signal CONT4 to the light source unit 600 .

The configuration of the control signal generator 280 will be described in detail with reference to FIG. 6 .

5A to 5C are histograms of images input to a display device according to embodiments of the present invention and images converted according to embodiments of the present invention.

Referring to FIGS. 1, 2 and 5A, the image analyzer 220 analyzes the input image data RGB including first image data (dotted line in FIG. 5A). For example, the image analyzer 220 may analyze the first image by analyzing first metadata of the first image or generating a first histogram related to the first image. As a result of the analysis, the first image has a first maximum luminance MAX and a first luminance range R. The image analyzer 220 outputs the analysis result (A) to the luminance range determiner 240 .

The luminance range determiner 240 determines the second luminance range CR based on the analysis result A. Referring to FIG. 5A , the luminance range determining unit 240 converts the first luminance range R to determine the second luminance range CR. The second luminance range CR may be greater than the first luminance range R. In this case, the first luminance range R may be smaller than the limit luminance range. The luminance range determination unit 240 outputs the determination result B to the image processing unit 260 and the control signal generation unit CONT4.

The image processor 260 generates the data signal DAT based on the input image data RGB and the determination result B. The data signal DAT includes data of a second image (solid line in FIG. 5A ) corresponding to the first image and having the second luminance range CR. The second image may be an image with an improved contrast ratio compared to the first image. For example, the second image may be an image having a high dynamic range (HDR). The image processor 260 outputs the data signal DAT to the data driver 500 .

The data driver 500 generates first data voltages based on the data signal DAT. The data driver 500 outputs the first data voltages to the display panel 100 .

The control signal generating unit 280 controls the operation of the light source unit 600 based on the input image data RGB, the input control signal CONT, and the determination result B. The fourth control signal ( CONT4) is created. The control signal generation unit 280 outputs the fourth control signal CONT4 to the light source unit 600 .

The light source unit 600 provides a first light to the display panel 100 in response to the second luminance range CR based on the fourth control signal CONT4 .

The display panel 100 displays the second image based on the first data voltages and the first light.

Referring to FIGS. 1, 2 and 5B, the image analyzer 220 analyzes the input image data RGB including third image data (dotted line in FIG. 5B). For example, the image analyzer 220 may analyze the third image by analyzing second metadata of the third image or generating a second histogram of the third image. As a result of the analysis, the third image has a third maximum luminance MAX and a third luminance range R. The image analyzer 220 outputs the analysis result (A) to the luminance range determiner 240 .

The luminance range determiner 240 determines a fourth luminance range CR based on the analysis result A. Referring to FIG. 5B , the luminance range determining unit 240 converts the third luminance range R to determine the fourth luminance range CR. The fourth luminance range CR may be smaller than the third luminance range R. In this case, the third luminance range R may be greater than the limit luminance range. The luminance range determination unit 240 outputs the determination result B to the image processing unit 260 and the control signal generation unit CONT4.

The image processor 260 generates the data signal DAT based on the input image data RGB and the determination result B. The data signal DAT includes data of a fourth image (solid line in FIG. 5B) corresponding to the third image and having the fourth luminance range CR. The third image may be an image having a high dynamic range (HDR). The image processor 260 outputs the data signal DAT to the data driver 500 .

The data driver 500 generates second data voltages based on the data signal DAT. The data driver 500 outputs the second data voltages to the display panel 100 .

The control signal generating unit 280 controls the operation of the light source unit 600 based on the input image data RGB, the input control signal CONT, and the determination result B. The fourth control signal ( CONT4) is created. The control signal generation unit 280 outputs the fourth control signal CONT4 to the light source unit 600 .

The light source unit 600 provides second light to the display panel 100 in response to the fourth luminance range CR based on the fourth control signal CONT4 .

The display panel 100 displays the fourth image based on the second data voltages and the second light.

Referring to FIGS. 1, 2, and 5C, the image analyzer 220 analyzes the input image data RGB including fifth image data (dotted line in FIG. 5C). For example, the image analyzer 220 may analyze the fifth image by analyzing third meta data of the fifth image or generating a third histogram of the fifth image. As a result of the analysis, the fifth image has a fifth maximum luminance MAX and a fifth luminance range R. The image analyzer 220 outputs the analysis result (A) to the luminance range determiner 240 .

The luminance range determiner 240 determines a sixth luminance range CR based on the analysis result A. Referring to FIG. 5C , the luminance range determining unit 240 maintains the fifth luminance range R to determine the sixth luminance range CR. That is, the sixth luminance range CR is substantially the same as the fifth luminance range R. In this case, the fifth image may be a video. The luminance range determination unit 240 outputs the determination result B to the image processing unit 260 and the control signal generation unit CONT4.

The image processor 260 generates the data signal DAT based on the input image data RGB and the determination result B. The data signal DAT includes data of a sixth image (solid line in FIG. 5C ) corresponding to the fifth image and having the sixth luminance range CR. The image processor 260 outputs the data signal DAT to the data driver 500 .

The data driver 500 generates third data voltages based on the data signal DAT. The data driver 500 outputs the third data voltages to the display panel 100 .

The control signal generating unit 280 controls the operation of the light source unit 600 based on the input image data RGB, the input control signal CONT, and the determination result B. The fourth control signal ( CONT4) is created. The control signal generation unit 280 outputs the fourth control signal CONT4 to the light source unit 600 .

The light source unit 600 provides third light to the display panel 100 in response to the sixth luminance range CR based on the fourth control signal CONT4 .

The display panel 100 displays the sixth image based on the third data voltages and the third light.

6 is a block diagram illustrating a control signal generator included in a display device according to example embodiments. 7 is a block diagram illustrating a light source unit included in a display device according to example embodiments.

1, 2, 6 and 7, the control signal generator 280 may include a panel controller 281 and a light source controller 282.

The panel controller 281 generates the first control signal CONT1 , the second control signal CONT2 , and the third control signal CONT3 based on the input control signal CONT.

The light source controller 282 generates the fourth control signal CONT4 for controlling the operation of the light source unit 600 based on the input image data RGB, the input control signal CONT, and the determination result B. generate The light source controller 282 outputs the fourth control signal CONT4 to the light source unit 600 .

The light source unit 600 may include a plurality of light source blocks B11, B12, B21, B22, .... Each of the light source blocks B11, B12, B21, B22, ... may independently emit light.

The light source controller 282 may independently control each of the light source blocks B11, B12, B21, B22, ... within the determined luminance range. The light source controller 282 controls the light source blocks B11, B12, B21 based on the representative luminance of the partial image corresponding to each of the light source blocks B11, B12, B21, B22, ... in the output image. , B22, ...) can be controlled respectively. For example, the representative luminance may be an average luminance of the partial image. Alternatively, the representative luminance may be at least one of a maximum luminance and a minimum luminance of the partial image.

8 to 11 are flowcharts illustrating a method of driving a display device according to example embodiments.

Referring to FIGS. 1, 2, 4, 6, and 8 to 11, the image analyzer 220 analyzes an input image having a first luminance range (S100). If the input image is a still image, the image information analyzer 222 analyzes the information of the input image, and if the input image is a moving image, the luminance range determiner 240 maintains the luminance range of the input image. . If the input image data includes metadata about the input image, the image information analyzer 222 analyzes the metadata, and if the input image data does not include the metadata about the input image, the image information analyzer 222 analyzes the metadata. , The image information analysis unit 222 may generate a histogram of the input image.

The luminance range determining unit 240 determines the second luminance range (S200). When the first luminance range is less than or equal to the limit luminance range, the second luminance range is greater than or equal to the first luminance range, and when the first luminance range is greater than the limit luminance range, the second luminance range is It may be smaller than the first luminance range.

The image processing unit 260 generates image data based on the second luminance range (S300), and the light source unit 600 emits light based on the second luminance range.

The display panel 100 displays an output image having the second luminance range based on the image data and the light.

The present invention can be applied to a display device and various devices and systems including the display device. Accordingly, the present invention relates to mobile phones, smart phones, PDAs, PMPs, digital cameras, camcorders, PCs, server computers, workstations, notebooks, digital TVs, set-top boxes, music players, portable game consoles, navigation systems, smart cards, and printers. It can be usefully used in various electronic devices such as

Although described with reference to the above embodiments, it will be understood that those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention described in the claims below. You will be able to.

100: display panel 200: timing controller
300: gate driver 400: gamma reference voltage generator
500: data driving unit

Claims (20)

an image analyzer configured to analyze a first image having a first luminance range based on input image data;
a luminance range determination unit determining a second luminance range based on a result of analyzing the first image;
an image processor generating first image data based on the input image data and the second luminance range;
a light source unit emitting a first light based on the second luminance range;
a data driver generating first data voltages based on the first image data; and
a display panel displaying a second image corresponding to the first image and having the second luminance range based on the first light and the first data voltages;
The display device according to claim 1 , wherein the image analysis unit includes a still image determining unit determining whether the first image is a still image or a moving image. According to claim 1,
The display device according to claim 1 , wherein the image analyzer analyzes first metadata included in the input image data and related to the first image. According to claim 2,
The first metadata includes information on at least one of a color coordinate, a maximum luminance, and a minimum luminance of the first image. According to claim 1,
The display device according to claim 1 , wherein the image analyzer analyzes the first image by generating a first histogram related to the first image based on the input image data. According to claim 4,
The display device according to claim 1 , wherein the first histogram is a histogram of at least one of luminance, color, saturation, and lightness of the first image. delete According to claim 1,
If the first image is the moving image, the second luminance range is the same as the first luminance range. According to claim 1,
The display device of claim 1 , wherein the luminance range determiner determines the second luminance range by comparing the first luminance range with a limit luminance range that can be provided by the light source unit. According to claim 8,
The display device according to claim 1 , wherein the second luminance range is smaller than the first luminance range when the first luminance range is greater than the limit luminance range. According to claim 8,
The display device of claim 1 , wherein when the first luminance range is less than or equal to the limit luminance range, the second luminance range is greater than or equal to the first luminance range. According to claim 1,
The image analyzer further analyzes a third image having the first luminance range based on the input image data;
The luminance range determining unit further determines a third luminance range different from the second luminance range based on a result of analyzing the third image;
The image processing unit further generates second image data based on the input image data and the third luminance range;
The light source unit further emits a second light based on the third luminance range,
The data driver further generates second data voltages based on the second image data;
The display device of claim 1 , wherein the display panel further displays a fourth image corresponding to the third image and having the third luminance range based on the second light and the second data voltages. According to claim 11,
The display device of claim 1 , wherein the image processing unit generates the first image data based on a first gamma and further generates the second image data based on a second gamma different from the first gamma. According to claim 1,
Further comprising a light source control unit for controlling the operation of the light source unit,
The light source unit includes a plurality of light source blocks,
The display device according to claim 1 , wherein the light source controller independently controls each of the light source blocks within the second luminance range. According to claim 13,
The display device according to claim 1 , wherein the light source controller controls each of the light source blocks based on a representative luminance of a partial image corresponding to each of the light source blocks in the second image. According to claim 14,
The display device according to claim 1 , wherein the representative luminance of the partial image is an average luminance of the partial image. analyzing a first image having a first luminance range based on input image data;
determining a second luminance range based on a result of analyzing the first image;
generating first image data based on the input image data and the second luminance range; and
Displaying a second image corresponding to the first image and having the second luminance range based on the second luminance range and the first image data;
Analyzing the first image
and determining whether the first image is a still image or a moving image. According to claim 16,
Analyzing the first image
and analyzing first metadata included in the input image data and related to the first image. According to claim 16,
Analyzing the first image
and generating a first histogram for the first image based on the input image data. delete According to claim 16,
The second image is displayed based on the first light having the second luminance range generated from the light source unit,
Determining the second luminance range
and comparing the first luminance range with a limit luminance range that can be provided by the light source unit.

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