JP2018128594A - Display unit, television receiver, backlight control method, control program, and recording medium - Google Patents

Abstract

In a technique for adjusting luminance, an image is displayed with more appropriate luminance according to a video signal. A display device (1) includes a backlight control unit (6) for controlling a backlight (7), and the backlight control unit corresponds to a region including an artificial display object in a display target image. The brightness of the corresponding area to be made is different from the brightness of other areas. [Selection] Figure 1

Description

  The present invention relates to a video processing apparatus that switches a conversion function between a gradation value and a luminance value.

  In recent years, as one of high image quality technologies, HDR (High Dynamic Range) which has more gradations (number of possible gradation values) and includes higher luminance information than SDR (Standard Dynamic Range) signals. ) The signal is getting attention. In addition, UHD BD discs capable of storing HDR signals have been commercialized. By using the HDR technology, it is possible to obtain a powerful image with higher brightness and higher contrast than before. The HDR signal includes luminance information of a maximum of about 10,000 nits as a standard. When the video indicated by the HDR signal includes a caption, the caption is also displayed with high luminance.

  As a technique for processing subtitles included in video, Patent Document 1 discloses that an original image is divided into video from which subtitles are extracted and information of subtitles that are extracted, and the divided information is interpolated and expanded. A circuit for synthesizing after performing reduction processing is disclosed.

JP 2001-169199 A (released on June 22, 2001)

  In the HDR technology, there is a demand for a technology for displaying a video with a more appropriate luminance according to the video signal.

  The present invention has been made in view of the above-described problems, and an object thereof is to display an image with a more appropriate luminance corresponding to a video signal in a technology for adjusting the luminance.

  In order to solve the above-described problems, a display device according to one embodiment of the present invention includes a backlight that includes a plurality of areas and can individually control the brightness of the plurality of areas, and controls the backlight. A backlight control unit, and the backlight control unit makes the brightness of the corresponding area corresponding to the region including the artificial display object in the display target image different from the brightness of the other areas.

  In order to solve the above problems, a video processing method according to an aspect of the present invention includes a backlight that includes a plurality of areas and that can individually control the brightness of the plurality of areas, and controls the backlight. A backlight control method by a display device comprising a backlight control unit, wherein in the backlight control step, the brightness of a corresponding area corresponding to a region including an artificial display object in a display target image, Different from the brightness of other areas.

  According to one embodiment of the present invention, in a technique for adjusting luminance, an image can be displayed with more appropriate luminance corresponding to a video signal.

It is a block diagram which shows the structure of the display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the external appearance of the television receiver provided with the display apparatus which concerns on Embodiment 1 of this invention. It is a flowchart explaining the video processing method which concerns on Embodiment 1 of this invention. (A) is a front view which shows the external appearance of the display apparatus which is displaying the display target image containing a caption. (B) is a graph which shows the PQ curve of the display target image which the display apparatus shown to (a) of FIG. 4 displays. It is a block diagram which shows the structure of the display apparatus which concerns on Embodiment 2 of this invention. It is a flowchart explaining the video processing method which concerns on Embodiment 2 of this invention. It is a flowchart explaining the video processing method which concerns on Embodiment 3 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail. However, unless otherwise specified, the configuration described in the present embodiment is merely an illustrative example, and is not intended to limit the scope of the present invention. In the present specification, “switching tone mapping” means switching a method for converting a gradation value indicated by a video signal into a luminance value used when displaying a video.

Embodiment 1
(Display device 1)
A display device 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a block diagram illustrating a configuration of a display device 1 according to the present embodiment. FIG. 2 is a front view showing an appearance of a television receiver including the display device 1. As shown in FIG. 1, the display device 1 includes a video processing unit 2, a backlight 7, and a display unit 8. The video processing unit 2 is a member that performs conversion (tone mapping) between a gradation value and a luminance value indicated by the video signal using a conversion function (conversion means in the claims), and includes a caption detection unit 3 and a switching unit 4. A conversion unit 5 and a backlight control unit 6 are provided.

  The caption detection unit 3 detects an artificial display object (caption in this embodiment) in the display target image indicated by the video signal acquired from the outside, and artificially detects the luminance data (gradation value) of the display target image. Luminance data of a corrected image obtained by excluding luminance data of a region including a display object is generated.

  The switching unit 4 switches the conversion function used in the conversion unit 5 according to the luminance level of the corrected image generated by the caption detection unit 3.

  The conversion unit 5 converts the gradation value of the corrected image into a luminance value using the conversion function switched by the switching unit 4 (specifically, used when displaying video from the gradation value indicated by the video signal). Conversion to luminance value (tone mapping)).

  The backlight control unit 6 controls the luminance of each area of the backlight 7 corresponding to the corrected image displayed on the display unit 8 to the luminance value converted by the conversion unit 5. In addition, the backlight control unit 6 sets the luminance of each area of the backlight 7 corresponding to the region including the artificial display object displayed by the display unit 8 (the region detected by the caption detection unit 3) of other areas. The brightness value is controlled to be different from the brightness (local dimming).

  The backlight 7 is composed of a plurality of areas, the brightness of the plurality of areas can be individually controlled, and the display unit 8 is irradiated with light based on control by the backlight control unit 6.

  The display unit 8 is a non-luminous display, and displays a display target image indicated by a video signal (RGB data excluding luminance data). A liquid crystal display etc. are mentioned as an example of a non-light-emitting display.

  In the present embodiment, a configuration using the non-light emitting display unit 8 and the backlight 7 is shown. However, each area of the backlight 7 corresponding to the region including the artificial display object displayed on the display unit 8 is displayed. When the configuration (local dimming) for controlling the brightness to be different from the brightness of other areas is not adopted, only the self-luminous display is used as the display unit 8 without using the backlight 7. May be. Examples of the self-luminous display include an organic EL display, a plasma display, and an LED display.

(Video processing method)
A flow of a video processing method executed by the display device 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing the flow of the backlight control method of the display device 1. Hereinafter, for simplification, description of the control of the display unit 8 is omitted.

  First, the caption detection unit 3 detects captions in a display target image indicated by an externally acquired video signal, and brightness data of an area including an artificial display object from brightness data (gradation value) of the display target image. The brightness data of the corrected image obtained by excluding is generated (step S0).

  Note that the caption detection unit 3 performs image processing such as edge detection using a filter on a display target image indicated by a video signal acquired from the outside, and excludes luminance data of a region including an artificial display object. be able to. However, the specific process of excluding the luminance data of the area including the artificial display object is not limited to the present embodiment.

  An example of the video signal processed by the caption detection unit 3 is an HDR signal. The HDR signal may be an HDMI signal based on HDMI (registered trademark) (High-Definition Multimedia Interface) standard, a Tuner signal (a signal received by a tuner), or the like.

  Further, the artificial display object detected by the caption detection unit 3 is a display object artificially created by CG (Computer Graphics) or the like, and is an object synthesized or added to the content video of the display target image. It can be. Examples of such objects include subtitles, logos (channel display), and control panels (OSDs that are superimposed on the transmission side such as STB and BD).

  As the next step after step S0, the switching unit 4 switches the conversion function used in the conversion unit 5 according to the luminance level of the luminance data of the corrected image generated by the caption detection unit 3 (step S1). As an example of the luminance level that the switching unit 4 refers to in order to switch the conversion function, the maximum gradation value or the average value of the gradation values in the luminance data of the corrected image can be cited.

  Next, the conversion unit 5 converts the gradation value of the corrected image into a luminance value using the conversion function switched by the switching unit 4 (step S2).

  Next, the backlight control unit 6 controls the luminance value of each area of the backlight 7 corresponding to the corrected image displayed on the display unit 8 to the luminance value converted by the conversion unit 5 (step S3).

  In step S3, the backlight control unit 6 determines the luminance of each area of the backlight 7 corresponding to the region including the artificial display object displayed by the display unit 8 (the region detected by the caption detection unit 3). The brightness value is controlled to be different from the brightness of other areas. Note that the backlight control unit adjusts the brightness (brightness) of the area corresponding to the region including the artificial display object displayed on the display unit 8 according to the gradation of the artificial display object. It is preferable that the brightness is different.

  In the present embodiment, the video processing unit 2 includes the conversion unit 5, and the conversion unit 5 converts the gradation value of the corrected image into a luminance value using the conversion function switched by the switching unit 4. Explained. However, one embodiment of the present invention is not limited to this. In one aspect of the present invention, the video processing unit 2 only needs to have a plurality of conversion means for setting the luminance value from the gradation value of the corrected image instead of using the conversion function (in the present embodiment, a plurality of conversion units are used). The switching unit 4 has only to switch the conversion unit according to the luminance level of the corrected image. For example, the video processing unit 2 has a table indicating correspondence between gradation values and luminance values in order to set luminance values from the gradation values of the corrected image, and the switching unit 4 displays the luminance level of the corrected image. The table to be referenced may be switched depending on

  In the above process, steps S0 to S2 may be omitted. Even with such a configuration, the effect of displaying a video with a more appropriate luminance in accordance with the video signal, more specifically, even if the display target image includes an artificial display object, There is an effect that an image can be displayed with luminance.

(Concrete example)
A specific example of the video processing method according to the present embodiment will be described below with reference to FIG. FIG. 4A is a front view showing an appearance of the display device 1 displaying a display target image including subtitles. FIG. 4B is a graph showing a PQ curve of the display target image displayed by the display device 1 shown in FIG. In FIG. 4B, the horizontal axis represents the gradation value before conversion, and the vertical axis represents the luminance value after conversion (luminance when displaying an image).

  As shown in FIG. 4A, the display unit 8 displays the corrected image A and the subtitle B obtained by excluding the luminance data of the area including the subtitle. In step S0 described above, the caption detection unit 3 detects the caption B in the display target image indicated by the video signal acquired from the outside, and the region including the caption B from the luminance data (gradation value) of the display target image. The brightness data of the corrected image A obtained by excluding the brightness data is generated.

  Next, in step S1, the switching unit 4 uses a PQ curve (EOTF according to SMPTE-ST2084) in which the graph of the gradation value before conversion and the luminance value after conversion corresponds to the maximum luminance level of the corrected image A. Switch to a conversion function that converts to the curve shown by. More specifically, the switching unit 4 converts the gradation value into a luminance value so that the luminance value corresponding to the maximum gradation value indicated by the video signal becomes a value of a predetermined maximum luminance level C. Switch to conversion function. Here, the predetermined maximum luminance level C may be an arbitrary value set in advance, but is set according to the luminance range that the video signal can take and the luminance range of the light that the backlight 7 can irradiate. Is preferred. An example of a specific value of the predetermined maximum luminance level C is 1000 nit.

  Next, in step S2, the conversion unit 5 converts the gradation value of the corrected image A into a luminance value using the conversion function switched by the switching unit 4. Next, in step S <b> 3, the backlight control unit 6 controls the luminance of each area of the backlight 7 corresponding to the corrected image A displayed on the display unit 8 to the luminance value converted by the conversion unit 5. Further, the backlight control unit 6 controls the luminance value of each area of the backlight 7 corresponding to the caption B displayed on the display unit 8 to a luminance value different from the luminance of the corrected image A.

  In the above specific example, for example, the gradation value corresponding to the caption B is larger than the gradation value corresponding to the corrected image A, and the switching unit 4 sets the maximum gradation value in the caption B in step S1 described above. When the conversion function is switched with reference, the PQ curve formed by the gradation value before conversion and the luminance value after conversion becomes like the dotted line in FIG. 4B, and the image becomes dark. .

  Therefore, in the present embodiment, in step S1, the switching unit 4 switches the conversion function with reference to the maximum gradation value of the corrected image A excluding the caption B from the display target image. As a result, the PQ curve formed by the gradation value before conversion and the luminance value after conversion becomes as shown by the solid line in FIG. 4B, and an image can be displayed with more appropriate luminance according to the video signal. it can.

  However, when only the luminance in the corrected image A is adjusted in this way, the luminance of the caption B may be relatively high. Therefore, the backlight control unit 6 controls the luminance of each area of the backlight 7 corresponding to the caption B displayed on the display unit 8 to be lower than the luminance of the corrected image A.

  The video processing method according to the present embodiment is also effective when the gradation value corresponding to the caption B is smaller than the gradation value corresponding to the corrected image A. In that case, the brightness of the corrected image A displayed by the display unit 8 is compared with the case where the subtitle B is not removed by switching the conversion function with reference to the maximum gradation value of the corrected image A excluding the subtitle B. As a result, the image becomes dark, and the image can be displayed with a more appropriate luminance according to the image signal. Further, the backlight control unit 6 may control the luminance of each area of the backlight 7 corresponding to the caption B displayed on the display unit 8 to be higher than the luminance of the corrected image A.

  In this specific example, an example of an absolute luminance method (including a PQ method) is shown as a luminance method when converting from a gradation value to a luminance value, but a relative luminance method (an HLG method or the like) is used as the luminance method. May be adopted. Even in that case, it is possible to achieve the same effect as the display device 1 according to the present embodiment.

(Summary of Embodiment 1)
When the display device displays the caption of the video indicated by the HDR signal, the conversion function applied to the luminance data of the image indicated by the HDR signal is switched with reference to the peak luminance and the average luminance in the luminance data included in the HDR signal. In that case, there is a problem that the conversion function is switched with reference to the peak luminance and the average luminance including the luminance data of the caption that may greatly change the peak luminance or the average luminance (APL).

  When a user displays subtitles with a controller or the like, in the case of an image with originally low peak luminance and low average luminance, the PQ curve is set to MAX CLL (for example, 10,000 nits) as the maximum luminance value. By changing the PQ curve to a PQ curve suitable for a display device, the optimum image quality can be supplied. However, due to the above problem, when a white character of a subtitle (current UHD-BD is set to 128/255, which is half of normal data) is displayed, this subtitle portion is detected as a peak luminance and PQ Create a curve. Further, even when a PQ curve is created with reference to the average luminance, the luminance of the subtitle portion is added, and the average luminance data cannot be obtained accurately. For this reason, it is not possible to display an image with the optimum brightness desired by the user.

  Therefore, the display device 1 according to the present embodiment switches the conversion unit with reference to the luminance level of the corrected image obtained by excluding the region including the artificial display object from the display target image. Accordingly, the luminance value can be set from the gradation value by the conversion unit according to the luminance level of the corrected image excluding an artificial display object that may greatly change the maximum luminance level or the average luminance level. . As a result, when the tone mapping method is switched with reference to the maximum luminance level or the average luminance level, the influence of the luminance of the artificial display object on the maximum luminance level or the average luminance level can be suppressed. Therefore, it is possible to display an image with a more appropriate luminance according to the image signal.

[Embodiment 2]
Embodiment 2 of the present invention will be described below with reference to FIGS. 5 and 6. For convenience of explanation, members having the same functions as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

(Display device 10)
The display device 10 according to the present embodiment will be described with reference to FIG. FIG. 5 is a block diagram illustrating a configuration of the display device 10 according to the present embodiment. As illustrated in FIG. 5, the display device 10 further includes a reception unit 12 of the video processing unit 11 in addition to the configuration of the display device 1 according to the first embodiment.

  The accepting unit 12 accepts selection by the user as to whether or not to execute the function of switching the conversion means with reference to the brightness level of the corrected image. In addition, the reception unit 12 determines whether or not to execute a function of making the brightness of the area (corresponding area) corresponding to the area including the artificial display object in the display target image different from the brightness of the other areas. Accepts selection by.

(Video processing method by display device 10)
A flow of a video processing method executed by the display device 10 according to the present embodiment will be described with reference to FIG. FIG. 6 is a flowchart showing the flow of the video processing method executed by the display device 10. Note that description of steps similar to those described in Embodiment 1 is omitted.

  First, the accepting unit 12 accepts a selection by the user as to whether or not to execute a function of switching conversion means with reference to the brightness level of the corrected image (step S10). In step S10, the reception unit 12 performs a function of making the brightness of an area (corresponding area) corresponding to an area including an artificial display object in the display target image different from the brightness of other areas. The selection by the user is accepted.

  Hereinafter, an example of step S10 will be described. For example, when the artificial display object is a caption, a logo, or a control panel, the user sets whether or not to display these in the user menu, and the reception unit 12 receives the setting. And when the reception part 12 receives the setting which displays a subtitle, a logo, or a control panel, it progresses to the next process. In addition, when the reception unit 12 receives a setting for displaying a caption, a logo, or a control panel, the backlight control unit 6 displays an area (corresponding area) corresponding to an area including an artificial display object in the display target image. The backlight control unit 6 is instructed to execute a function of making the brightness different from the brightness of other areas.

  As the next step of step S10, the caption detection unit 3 detects the caption in the display target image indicated by the video signal acquired from the outside based on the user's selection received by the reception unit 12, and the luminance of the display target image. From the data (gradation value), the luminance data of the corrected image obtained by excluding the luminance data of the area including the artificial display object is generated (step S11).

  Next, the switching unit 4 switches the conversion function used in the conversion unit 5 according to the luminance level of the luminance data of the corrected image generated by the caption detection unit 3 (step S12).

  Next, the conversion unit 5 converts the gradation value of the corrected image into a luminance value using the conversion function switched by the switching unit 4 (step S13).

  Next, the backlight control unit 6 controls the luminance of each area of the backlight 7 corresponding to the corrected image displayed on the display unit 8 to the luminance value converted by the conversion unit 5 (step S14).

  In step S <b> 14, the backlight control unit 6 includes an artificial display object displayed on the display unit 8 based on the user selection received by the reception unit 12 (region detected by the caption detection unit 3). The brightness of each area of the backlight 7 corresponding to is controlled to a brightness value different from the brightness of other areas.

  In the above process, steps S11 to S13 may be omitted. Even with such a configuration, the effect of displaying a video with a more appropriate luminance in accordance with the video signal, more specifically, even if the display target image includes an artificial display object, There is an effect that an image can be displayed with luminance.

(Summary of Embodiment 2)
As described above, the display device 10 according to the present embodiment accepts the selection by the user as to whether or not to execute the function of switching the conversion means with reference to the luminance level of the corrected image. Thereby, the user can select whether to switch the conversion means with reference to the luminance level of the corrected image.

  Further, the display device 10 according to the present embodiment determines whether or not to execute the function of making the brightness of the corresponding area corresponding to the area including the artificial display object in the display target image different from the brightness of the other areas. , Accepts selection by the user. This adjusts the brightness of the backlight corresponding to each area so that there is no unnatural boundary between the area containing the artificial display object and the area other than the area containing the artificial display object. Can do. Therefore, it is possible to display an image with a more appropriate luminance according to the image signal.

[Embodiment 3]
Embodiment 3 of the present invention will be described below with reference to FIG. Note that the video processing method according to the present embodiment can be executed by using the display device 1 according to the first embodiment. Therefore, for convenience of explanation, members having the same functions as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

(Video processing method according to Embodiment 3)
A flow of a video processing method executed by the display device 1 according to the present embodiment will be described with reference to FIG. FIG. 7 is a flowchart showing the flow of the video processing method executed by the display device 1. Note that description of steps similar to those described in Embodiment 1 is omitted.

  First, the caption detection unit 3 determines the category, genre, or scene type of the display target image indicated by the video signal from the metadata included in the video signal acquired from the outside, and converts it with reference to the luminance level of the corrected image. It is determined whether or not to execute a function for switching means (step S20). When the caption detection unit 3 determines to execute the function of switching the conversion means with reference to the luminance level of the corrected image, the process proceeds to step S21. When the caption detection unit 3 determines not to execute the function of switching the conversion unit with reference to the luminance level of the corrected image, the process ends.

  As an example of a method for determining whether or not to execute the function of switching the conversion means with reference to the luminance level of the corrected image, the caption detection unit 3 uses a display object whose category, genre, or scene is an artificial display object. In the case of a category, genre, or scene that has a high possibility of being included, there is a method of determining to execute a function of switching conversion means with reference to the luminance level of the corrected image. In that case, when the category of the display target image is a movie, the display target image is likely to include subtitles, so the subtitle detection unit 3 executes a function of switching the conversion means with reference to the luminance level of the corrected image. Judge that. When the category of the display target image is sports, the caption detection unit 3 further determines whether the scene of the display target image is indoor or outdoor, and based on the determination, the switching unit 4 The conversion function may be switched (for example, in conjunction with the average luminance of the display target image).

  In step S20, the caption detection unit 3 determines the category, genre, or scene type of the display target image indicated by the video signal from the metadata included in the video signal acquired from the outside, and artificially displays the image in the display target image. It is determined whether or not to execute a function of making the brightness of the corresponding area corresponding to the area including the display object different from the brightness of the other areas. The determination method is the same as the method for determining whether to execute the function of switching the conversion means with reference to the luminance level of the corrected image. For this reason, the caption detection unit 3 performs a function of switching the conversion means with reference to the brightness level of the corrected image to determine whether to execute the function of making the brightness of the corresponding area different from the brightness of the other areas. It may be determined depending on whether or not to do so.

  In step S21, the caption detection unit 3 detects the caption in the display target image indicated by the video signal acquired from the outside, and includes an artificial display object from the luminance data (gradation value) of the display target image. The brightness data of the corrected image obtained by excluding the brightness data of the area is generated (step S21).

  Next, the switching unit 4 switches the conversion function used in the conversion unit 5 in accordance with the luminance level of the luminance data of the corrected image generated by the caption detection unit 3 (step S22).

  Next, the conversion unit 5 converts the gradation value of the corrected image into a luminance value using the conversion function switched by the switching unit 4 (step S23).

  Next, the backlight control unit 6 controls the luminance of each area of the backlight 7 corresponding to the corrected image displayed on the display unit 8 to the luminance value converted by the conversion unit 5 (step S24).

  If it is determined in step S20 that the caption detection unit 3 performs the function of making the brightness of the corresponding area different from the brightness of the other areas, the backlight control unit 6 displays the display unit 8 in step S24. The luminance of each area of the backlight 7 corresponding to the area including the artificial display object (area detected by the caption detection unit 3) displayed by is controlled to a luminance value different from the luminance of the other areas.

  In the above process, steps S21 to S23 may be omitted. In that case, step S20 executes the following process instead of the process described above.

(Step S20a)
The caption detection unit 3 determines the category, genre, or scene type of the display target image indicated by the video signal from the metadata included in the video signal acquired from the outside.

(Step S20b)
Subsequently, the brightness of each area of the backlight 7 corresponding to the area including the artificial display object displayed on the display unit 8 (the area detected by the caption detection unit 3) is different from the brightness of the other areas. Whether to control the brightness value is determined according to the determination result in step S20a. When it determines with controlling the backlight 7 as mentioned above, it progresses to step S24.

  Even with such a configuration, the effect of displaying a video with a more appropriate luminance in accordance with the video signal, more specifically, even if the display target image includes an artificial display object, There is an effect that an image can be displayed with luminance. Moreover, suitable backlight control can be performed according to the category, genre, or scene of the display target image indicated by the video signal.

(Summary of Embodiment 3)
As described above, the display device 1 according to the present embodiment switches the conversion unit with reference to the luminance level of the corrected image according to the category, genre, or scene of the display target image. As a result, when there is a high possibility that the category, genre, or scene of the display target image includes an artificial display object, the conversion means is switched with reference to the luminance level of the corrected image as necessary. The conversion means can be switched.

  Further, the display device 1 according to the present embodiment makes the brightness of the corresponding area different from the brightness of other areas according to the category, genre, or scene of the display target image. As a result, when there is a high possibility that the category, genre, or scene of the display target image contains an artificial display object, the brightness of the corresponding area is made different from the brightness of other areas as necessary. Local dimming can be performed.

[Example of software implementation]
The control blocks of the display devices 1 and 10 (in particular, the caption detection unit 3, the switching unit 4, the conversion unit 5, the backlight control unit 6, and the reception unit 12) are logic circuits formed in an integrated circuit (IC chip) or the like. (Hardware) or software using a CPU (Central Processing Unit).

  In the latter case, the display devices 1 and 10 include a CPU that executes instructions of a program that is software that realizes each function, and a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by a computer (or CPU). ) Or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) for expanding the program, and the like. The computer (or CPU) reads the program from the recording medium and executes the program, thereby achieving the object of one embodiment of the present invention. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. Note that one embodiment of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

[Summary]
A display device (1, 10) according to an aspect 1 of the present invention includes a backlight (7) that includes a plurality of areas and can individually control the brightness of the plurality of areas, and a backlight that controls the backlight. A light control unit (6), and the backlight control unit makes the brightness of the corresponding area corresponding to the region including the artificial display object in the display target image different from the brightness of the other areas.

  According to said structure, a video | video can be displayed with the more suitable brightness | luminance according to the video signal. More specifically, even when the display target image includes an artificial display object, an image can be displayed with appropriate luminance.

  The display device (1, 10) according to aspect 2 of the present invention is the display apparatus (1, 10) according to aspect 1, wherein the backlight control unit determines the brightness of the area corresponding to the area including the artificial display object. Depending on the gradation of the display object, the brightness of other areas may be different.

  According to said structure, according to the gradation of an artificial display object, the brightness of the backlight corresponding to each area | region can be adjusted more appropriately.

  In the display device (1, 10) according to aspect 3 of the present invention, in the aspect 1 or 2, the artificial display object may be an object synthesized or added to the content video of the display target image. .

  According to the above configuration, it is possible to appropriately adjust the brightness of the backlight when displaying a display target image including an object synthesized or added to the content video.

  In the display device (1, 10) according to aspect 4 of the present invention, in the aspect 3, the object may be a caption, a logo, or a control panel.

  According to said structure, the brightness of a backlight can be adjusted appropriately when displaying the display object image containing a subtitle, a logo, or a control panel.

  In the display device (10) according to aspect 5 of the present invention, in the above aspects 1 to 4, whether or not the backlight control unit performs a function of making the brightness of the corresponding area different from the brightness of other areas. An accepting unit (12) for accepting selection by the user may be further provided.

  According to the above configuration, the user can select whether or not to make the brightness of the corresponding area different from the brightness of other areas.

  In the display device (1, 10) according to the aspect 6 of the present invention, in the above aspects 1 to 5, the backlight control unit is configured such that the brightness of the corresponding area depends on the category, genre, or scene of the display target image. May be different from the brightness of other areas.

  According to the above configuration, when the category, genre, or scene of the display target image is likely to include an artificial display object, the brightness of the corresponding area is made different from the brightness of the other areas. The local dimming can be preferably performed.

  The television receiver (100) according to the seventh aspect of the present invention may include any one of the display devices according to the first to sixth aspects.

  According to said structure, the effect which the said display apparatus has in each said aspect can be acquired in the said television receiver.

  The backlight control method according to aspect 8 of the present invention is based on a display device (1, 10) that includes a plurality of areas and includes a backlight (7) that can individually control the brightness of the plurality of areas. The backlight control method includes a backlight control step of making the brightness of the corresponding area corresponding to the area including the artificial display object in the display target image different from the brightness of the other areas.

  According to said structure, there exists an effect similar to the said aspect 1. FIG.

  The video processing apparatus according to each aspect of the present invention may be realized by a computer. In this case, the video processing apparatus is operated on each computer by causing the computer to operate as each unit (software element) included in the video processing apparatus. Also included in the scope of the present invention are a control program for the video processing apparatus to be realized and a computer-readable recording medium on which the program is recorded.

  The embodiment of the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and technical means disclosed in different embodiments are appropriately combined. The obtained embodiment is also included in the technical scope of the embodiment of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

DESCRIPTION OF SYMBOLS 1,10 Display apparatus 2,11 Video processing part 3 Subtitle detection part 4 Switching part 5 Conversion part 6 Backlight control part 7 Backlight 8 Display part 12 Reception part

Claims (10)

A backlight composed of a plurality of areas and capable of individually controlling the brightness of the plurality of areas,
A backlight control unit for controlling the backlight,
The display apparatus according to claim 1, wherein the backlight control unit changes the brightness of a corresponding area corresponding to a region including an artificial display object in a display target image, from the brightness of another area. The backlight control unit makes the brightness of an area corresponding to the area including the artificial display object different from the brightness of other areas according to the gradation of the artificial display object. The display device according to claim 1. The display device according to claim 1, wherein the artificial display object is an object synthesized or added to a content video of the display target image. The display device according to claim 3, wherein the object is a subtitle, a logo, or a control panel. The said backlight control part is further provided with the reception part which receives the selection by a user whether the function which makes the brightness of the said corresponding area different from the brightness of another area is performed. The display device according to any one of 1 to 4. The said backlight control part makes the brightness of the said corresponding area different from the brightness of another area according to the category of the said display object image, a genre, or a scene. Item 1. A display device according to item 1.   A television receiver comprising the display device according to claim 1. A backlight control method by a display device comprising a plurality of areas and having a backlight capable of individually controlling the brightness of the plurality of areas,
A backlight control method, comprising: a backlight control step of causing the brightness of a corresponding area corresponding to a region including an artificial display object in a display target image to be different from the brightness of another area.   A control program for causing a computer to function as the display device according to claim 1, wherein the control program causes the computer to function as the backlight control unit.   A computer-readable recording medium on which the control program according to claim 9 is recorded.

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