JP6367274B2 - Display control apparatus and display system - Google Patents

Description

  The present invention relates to a display control device that controls display of each of a plurality of display devices, and a display system including the display control device and the plurality of display devices.

  A multi-display device is known in which a plurality of display devices are arranged vertically, horizontally, or vertically and horizontally, and a divided image is displayed on each of the plurality of display devices to form one large screen with the plurality of display devices as a whole. Yes.

  On the other hand, there is also known a technique called local dimming in which an individual display is divided into a plurality of backlight areas and the brightness of the backlight is controlled for each individual backlight area.

International Publication No. 2012/108337 (Released on August 16, 2012) Japanese Patent No. 5165788 (registered on March 21, 2013)

  By the way, when trying to display an image on a plurality of display devices equipped with a local dimming function, the luminance of the image may vary among the display devices.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a display capable of displaying an image using a plurality of display devices equipped with a local dimming function while suppressing variations in luminance. It is to realize a control device.

  In order to solve the above problems, a display control device according to an aspect of the present invention relates to a luminance common to each of the plurality of display devices in the display control device that controls display of each of the plurality of display devices. A setting unit configured to set a setting value; and a providing unit configured to provide the setting value to each of the plurality of display devices.

  According to one embodiment of the present invention, it is possible to display an image using a plurality of display devices equipped with a local dimming function while suppressing variation in luminance.

1 is a plan view of a display system according to Embodiment 1 of the present invention. It is a functional block diagram which shows the outline | summary of the display system which concerns on Embodiment 1 of this invention. An example of the control in the display system which concerns on Embodiment 1 of this invention is shown. It is a flowchart which shows the flow of the process which the multi-display controller in Embodiment 1 of this invention produces | generates LUT. It is a graph which shows the relationship between the gradation value in 1st Embodiment of this invention, and a luminance value, (a) is an example of a graph, (b) is another example of a graph, (c) is This is still another example of the graph. It is a functional block diagram which shows the outline | summary of the display system which concerns on Embodiment 2 of this invention. It is a functional block diagram which shows the outline | summary of the display system which concerns on Embodiment 3 of this invention. It is a functional block diagram which shows the outline | summary of the display system which concerns on Embodiment 4 of this invention. It is a functional block diagram which shows the outline | summary of the display system which concerns on Embodiment 5 of this invention. It is a functional block diagram which shows the outline | summary of the display system which concerns on Embodiment 6 of this invention. An example of the control in the display system which concerns on Embodiment 6 of this invention is shown.

Embodiment 1
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a plan view of a display system 1 according to the present embodiment. As shown in FIG. 1, the display system 1 arranges a plurality of display devices 10 n vertically and horizontally, displays an image divided into each of the plurality of display devices 10 n, and displays one large screen on the entire plurality of display devices 10 n. Is configured. The display system 1 may be realized as a television receiver together with a tuner (not shown).

  FIG. 2 is a functional block diagram showing an overview of the display system 1 according to the present embodiment.

  The display system 1 includes a multi-display controller 10 and n (n = 1 to N) HDR display devices 10n.

  The multi display controller 10 receives image data of an image to be displayed. The multi-display controller 10 includes a setting unit 12 and a providing unit 14.

  In the present embodiment, the display device 10n is a liquid crystal display device, and controls the tone mapping unit 10n1, the local dimming unit 10n3, the LCD 10n5, the LED backlight 10n9 that is a light emitting device for image display, and the LED backlight 10n9. An LCD controller 10n7 is provided.

  In the display device 10n, the LCD 10n5 controls the light transmittance from the LED backlight 10n9 and displays an image. As an example of such an LED backlight 10n9, a member divided into a plurality of areas facing the LCD 10n5 is provided. There is a type in which LEDs are arranged, LEDs are provided in each area, and light emission of the LEDs is controlled for each area (hereinafter, sometimes referred to as “area driving type”). In the present embodiment, the light emitting area of the LED backlight 10n9 is divided into M areas, and individual LED backlights are distinguished from 10n9m (m = 1 to M).

  The area-driven LED backlight 10n9 can adjust the luminance of the LED backlight 10n9 (power supplied to the LED backlight 10n9) for each area based on the image n.

  In this specification, “luminance for each area” is determined according to the brightness of the LED backlight 10n9m for each area and the luminance value for each area in the image n. Here, the brightness of the LED backlight 10n9m for each area is determined according to the duty ratio of the LED backlight control signal for each area.

  The local dimming unit 10n3 supplies a backlight control signal to the LED backlight 10n9m for each of the plurality of areas, and controls light emission of the LED backlight 10n9m for each of the plurality of areas.

  The local dimming unit 10n3 supplies a signal including luminance information of the LED backlight 10n9m to the multi-display controller 10. The local dimming unit 10n3 may be information including luminance information of the LED backlight 10n9m as information on the luminance of the image displayed on the display device 10n, and is a backlight control signal supplied to the LED backlight 10n9m. The maximum value of the duty ratio (maximum PWM value) may be supplied to the multi-display controller 10.

  The setting unit 12 sets a setting value related to luminance that is common to each of the plurality of display devices 10n. The setting unit 12 may set the set value according to the luminance that can be displayed on each of the plurality of display devices 10n. For example, you may set according to the brightness of LED backlight 10n9m for every area at the time of displaying the past frame. More specifically, you may set according to the control signal of LED backlight 10n9m for every area at the time of displaying the past frame. More specifically, you may set according to the duty ratio of the PWM signal as a backlight control signal supplied to LED backlight 10n9m for every area at the time of displaying a past frame. For example, the setting unit 12 refers to the maximum value = max (10n9m: m = 1 to M) of the duty ratios of the PWM signals of the individual LED backlights 10n9m of the display device 10n, and among these maximum values, The set value may be set according to the smallest minimum value = min (max (10n9m: m = 1 to M): n = 1 to N).

  The “backlight control signal supplied to the LED backlight 10n9m” may be a backlight control signal that has already been supplied to the LED backlight 10n9m, or may be sent to the LED backlight 10n9m in the future. It may also be a backlight control signal supplied to it.

  More specifically, the setting unit 12 may set a function used for tone mapping applied to the data of the image n in the tone mapping unit 10n1 as the setting value. In this case, the function may be an LUT (Look Up Table) that defines conversion (gain) from the gradation value of the input image data to the luminance value of the image displayed on the display device 10n.

  Note that the setting value related to the brightness set by the setting unit 12 is not limited to the above-described LUT, and may be a setting value related to the brightness referred to in the display device 10n. Other examples of the setting value include a register value for selecting one of a plurality of tone map shapes stored in the memory of the display device 10n, and a correction coefficient described later.

  The providing unit 14 provides the setting value set by the setting unit 12 to each of the plurality of display devices 10n.

  The providing unit 14 passes the setting value to the tone mapping unit 10n1 so that the tone mapping unit 10n1 included in each display device 10n performs common tone mapping.

  Next, an example of control in the display system 1 according to the present embodiment will be described with reference to the flowcharts of FIGS.

  The processing of steps S10 to S22 in FIG. 3 is executed by the multi-display controller 10, and the processing of steps S24 to S44 in FIG. 3 is executed by the display device 10n.

  First, steps S10 to S12 executed by the multi-display controller 10 will be described.

(Step S10)
The multi display controller 10 acquires image data. This image data may be received from a television broadcast or the like, or may be sent from an external video device such as a DVD device or a BD device.

(Step S12)
The setting unit 12 of the multi-display controller 10 generates data used for tone mapping processing performed on the image data in the display device 10n according to the information related to luminance. The information regarding luminance may be a maximum PWM value, for example. The providing unit 14 of the multi-display controller 10 outputs data used for tone mapping processing to the tone mapping unit 10n1 of the display device 10n. An example of processing of the multi-display controller 10 in step S12 will be described with reference to steps S50 to 56 in FIG.

(Step S50)
The multi-display controller 10 acquires PeakLum, which is information indicating the maximum display brightness, which is displayable brightness, for each of the display devices 10n. The PeakLum is stored in advance in a storage unit (not shown) according to the LED backlight 10n9m, and the multi-display controller 10 acquires PeakLum from the storage unit.

(Step S52)
The multi-display controller 10 acquires MAX_GS_ORIG and MAX_GS from the local dimming unit 10n3. Here, MAX_GS_ORIG is a value obtained by normalizing outputable luminance. MAX_GS is a value indicating the ratio of the maximum luminance of the image to be displayed with respect to MAX_GS_ORIG.

(Step S54)
The multi-display controller 10 calculates peak luminance (PeakW) by the following formula.

PeakW = PeakLum · MAX_GS / MAX_GS_ORIG
For example, when PeakLum = 1500 cd / m ² , MAX_GS = 0.5, and MAX_GS_ORIG = 1, PeakW is 1500 · 0.5 / 1 = 750 cd / m ² . Here, when MAX_GS_ORIG = 1, the multi-display controller 10 may refer to only the value of MAX_GS. In other words, the multi-display controller 10 refers to the luminance that can be output (MAX_GS / MAX_GS_ORIG), and generates correspondence information indicating the correspondence between the luminance that can be output and PeakLum.

(Step S56)
The setting unit 12 of the multi-display controller 10 generates an LUT (Look Up Table) according to the calculated peak luminance. For example, when the calculated peak luminance is 500 cd / m ² , the setting unit 12 generates an LUT such that the relationship between the gradation value and the luminance value becomes a graph shown in FIG. Further, for example, when the calculated peak luminance is 1000 cd / m ² , the setting unit 12 generates an LUT such that the relationship between the gradation value and the luminance value becomes a graph shown in FIG. Further, for example, when the calculated peak luminance is 1200 cd / m ² , the setting unit 12 generates an LUT such that the relationship between the gradation value and the luminance value becomes a graph shown in FIG.

  In other words, the setting unit 12 sets the degree of increase in the luminance value with respect to the gradation value (the slope of the graph shown in FIG. 5) as the calculated peak luminance is lower. Further, the setting unit 12 sets a value with a smaller degree of increase in the luminance value (gradient of the graph shown in FIG. 5) with respect to the gradation value as the calculated peak luminance is higher.

  Then, the providing unit 14 outputs the LUT generated by the setting unit 12 to the tone mapping unit 10n1. The process executed by the multi-display controller 10 proceeds to step S14.

  Next, step S24 executed by the display device 10n will be described.

(Step S24)
The tone mapping unit 10n1 acquires an LUT from the providing unit 14 as data used for tone mapping processing.

  Next, steps S14 to S16 executed by the multi-display controller 10 will be described.

(Step S14)
The multi-display controller 10 generates data of an image n obtained by trimming an image indicated by the acquired image data for each display device 10n.

(Step S16)
The multi-display controller 10 outputs image n data to each display device 10n.

  Next, steps S26 to S38 executed by the display device 10n will be described.

(Step S26)
The display device 10n acquires the data of the image n from the multi-display controller 10.

(Step S28)
The tone mapping unit 10n1 uses the LUT acquired from the providing unit 14 to perform tone mapping processing on the data of the image n.

(Step S30)
The local dimming unit 10n3 generates LED data and LCD data based on the data of the image n.

  Here, the LED data is determined based on the luminance of the image n corresponding to each area. In contrast, the LCD 10n5 corresponding to each area has a plurality of pixels. Therefore, the LED data of each area is determined based on the maximum luminance value of each of the plurality of pixels. In addition, the determination method of LED data is not limited to this, For example, the determination based on the average value of the brightness | luminance of the several pixel corresponding to each area may be sufficient.

  The local dimming unit 10n3 determines the LED data of each area in accordance with the frame period when the data of the image n is moving image data. The period is not limited to every frame, but may be performed every fixed frame such as every 5 frames or every 10 frames. Further, when the data of the image n is still image data, the LED data may be determined when the image changes.

  The local dimming unit 10n3 sends the LED data to the LED controller 10n7.

(Step S32)
The LED controller 10n7 performs adjustments such as white balance and temperature correction on the LED data. The LED controller 10n7 calculates a backlight APL (Average Picture Level) value based on the adjusted LED data.

(Step S34)
The LED controller 10n7 compares the backlight APL value with the limit value (%) of the LED backlight 10n9. When the LED controller 10n7 determines in step S36 that the limit value exceeds the backlight APL value, the process proceeds to step S38. If the LED controller 10n7 determines in step S36 that the limit value is equal to or less than the backlight APL value, the process proceeds to step S40.

  Here, the limit value is a ratio of the limit power value to the maximum value of the power that can be supplied to the LED backlight 10n9. In general, the LED backlight 10n9 has a maximum supply power when the LCD 10n5 displays all white, and its value is limited to a predetermined limit power value in order to achieve power saving and low heat generation. .

(Step S36)
The LED controller 10n7 substitutes 1 for the pre-correction coefficient.

(Step S38)
The LED controller 10n7 substitutes a value obtained by dividing the limit value by the backlight APL value into the pre-correction coefficient.

  Next, steps S18 to S22 executed by the multi-display controller 10 will be described.

(Step S18)
The multi-display controller 10 acquires information on each pre-correction coefficient, backlight APL value, and luminance from all the display devices 10n. The pre-correction coefficient and the backlight APL value are supplied to the multi-display controller 10 by the LED controller 10n7. In addition, information regarding luminance is supplied to the multi-display controller 10 by the local dimming unit 10n3.

(Step S20)
The setting unit 12 sets a correction coefficient common to all the display devices 10n as a setting value related to luminance.

(Step S22)
The multi-display controller 10 acquires information on the luminance for the next frame in which the correction coefficient is set by the local dimming unit 10n3 from the local dimming unit 10n3.

  Next, steps S40 to S44 executed by the display device 10n will be described.

(Step S40)
The local dimming unit 10n3 acquires a correction coefficient common to all the display devices 10n from the providing unit 14.

(Step S42)
The local dimming unit 10n3 corrects the LED data adjusted in step S34 according to the correction coefficient acquired in step S42.

(Step S44)
The LCD 10n5 and the LED backlight 10n9 display an image based on the LCD data generated by the local dimming unit 10n3 and the LED data corrected according to the correction coefficient set by the setting unit 12 by the local dimming unit 10n3. . Thereby, the display device 10n can display an image so as to have a luminance corresponding to the set value set by the setting unit 12.

  Next, an example of the tone value of the data of the image n converted by the tone mapping unit 10n1 will be described with reference to FIG. FIG. 5 is a graph showing the relationship between the gradation value of the input image n data and the luminance value of the image after conversion in this embodiment, (a) is an example of the graph, and (b) Is another example of the graph, and (c) is yet another example of the graph.

  For example, the tone mapping unit 10n1 refers to the LUT so that the input image n is set so that the luminance value of the image shown in the graphs illustrated in FIGS. 5A to 5C is obtained. The tone value of the data is converted. Here, as shown in FIGS. 5A to 5C, the LUT indicates the degree of increase in the luminance value with respect to the gradation value (the slope of the graph shown in FIG. 5), and tone mapping. The unit 10n1 converts the gradation value of the data of the image n so that the correspondence relationship indicated by the LUT is obtained.

  Then, the tone mapping unit 10n1 outputs the luminance value of the image converted using the LUT to the local dimming unit 10n3.

  In the present embodiment, the maximum PWM value is passed from the local dimming unit 10n3 to the multi-display controller 10 as information relating to luminance. However, the present invention is not limited to this, and an average value of PWM values in each area may be passed.

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIG.

  For convenience of explanation, explanation of the same contents as those explained in the embodiment is omitted, and only contents different from those explained in the embodiment are explained.

  Similar to the display system 1 according to the first embodiment, the display system 2 according to the present embodiment includes a multi-display controller 20 including a setting unit 22 and a providing unit 24, a tone mapping unit 20n1, a local dimming unit 20n3, an LCD 20n5, and an LED. The display device 20n includes a controller 20n7 and an LED backlight 20n9.

  The display device 20n including the tone mapping unit 20n1, the local dimming unit 20n3, the LCD 20n5, the LED controller 20n7, and the LED backlight 20n9 included in the display system 2 according to the present embodiment is a tone included in the display system 1 according to the first embodiment. This corresponds to the display device 10n including the mapping unit 10n1, the local dimming unit 10n3, the LCD 10n5, the LED controller 10n7, and the LED backlight 10n9.

  In the present embodiment, the setting unit 22 sets the setting values described in the first embodiment. The providing unit 24 includes the set setting value in the metadata of the HDR image data and provides the set value to the display device 20n.

  The tone mapping unit 20n1 of the display device 20n performs tone mapping on the HDR image data of the image n with reference to the metadata.

[Embodiment 3]
The following will describe still another embodiment of the present invention with reference to FIG.

  For convenience of explanation, explanation of the same contents as those explained in the embodiment is omitted, and only contents different from those explained in the embodiment are explained.

  In the display system 3 according to the present embodiment, unlike the display system 1 according to the first embodiment, the display device 30n does not include a tone mapping unit, and includes a multi-display controller 30 including a setting unit 32 and a providing unit 34, and a local dimming unit. 30n3, LCD 30n5, LED controller 30n7, and display device 30n including LED backlight 30n9.

  The display device 30n including the local dimming unit 30n3, the LCD 30n5, the LED controller 30n7, and the LED backlight 30n9 included in the display system 3 according to the present embodiment is the local dimming unit 10n3 and LCD 10n5 included in the display system 1 according to the first embodiment, respectively. , Corresponding to a display device 10n including an LED controller 10n7 and an LED backlight 10n9.

  In the present embodiment, the setting unit 32 sets the setting values described in the first and second embodiments, and also performs tone mapping on the image data using the set setting values. Then, the providing unit 34 provides each display device 30n with the data subjected to tone mapping.

  That is, in the present embodiment, each display device 30n displays an image without performing tone mapping.

[Embodiment 4]
The following will describe another embodiment of the present invention with reference to FIG.

  Similar to the display system 1 according to the first embodiment, the display system 4 according to the present embodiment includes a multi-display controller 40 including a setting unit 42 and a providing unit 44, a tone mapping unit 40n1, a local dimming unit 40n3, an LCD 40n5, and an LED. The display device 40n includes a controller 40n7 and an LED backlight 40n9.

  The multi-display controller 40 including the providing unit 44 included in the display system 4 according to the present embodiment, and the display device 40n including the tone mapping unit 40n1, the LCD 40n5, the LED controller 40n7, and the LED backlight 40n9 are respectively described in the first embodiment. The display system 1 corresponds to the multi-display controller 10 including the providing unit 14 and the display device 10n including the tone mapping unit 10n1, the LCD 10n5, the LED controller 10n7, and the LED backlight 10n9.

  For the sake of convenience, the description of the same contents as those described in the embodiment will be omitted, and only the contents different from the contents described in the embodiment will be described.

  In the present embodiment, the local dimming unit 40n3 does not supply information related to the luminance of the image displayed on the display device 40n to the multi-display controller 40, and the LED controller 40n7 includes a pre-correction coefficient and a backlight APL value. The difference from the first embodiment is that no signal is supplied to the multi-display controller 40.

  In the present embodiment, the multi-display controller 40 includes a storage unit (not shown), and data related to local dimming executed by the local dimming unit 40n3 of the display device 40n is stored in the storage unit. Examples of the data related to local dimming include data of the number of divisions indicating how many backlight areas the display of the display device 40n is divided into. The setting unit 42 refers to the information stored in the storage unit, estimates the luminance that can be displayed on each display device 40n, and sets a setting value according to the estimated luminance. Here, as a specific example of the set value in the present embodiment, the set value in the above-described embodiment can be given. The set value that has been set is provided by the providing unit 44 to the display device 40n.

  Further, the setting unit 42 generates LED data, LCD data for each display device 40n, white balance of LED data, temperature, as described with reference to a flowchart (FIG. 11) in the column of Embodiment 6 described later. Adjustments such as correction are also made.

  The tone mapping unit 40n1 of the display device 40n performs tone mapping of the HDR image data of the image n using the set value. Further, the local dimming unit 40n3 of the display device 40n corrects the LED data according to the correction coefficient as the set value.

[Embodiment 5]
The following will describe another embodiment of the present invention with reference to FIG.

  For convenience of explanation, explanation of the same contents as those explained in the embodiment is omitted, and only contents different from those explained in the embodiment are explained.

  Similar to the display system 4 according to the fourth embodiment, the display system 5 according to the present embodiment includes a multi-display controller 50 including a setting unit 52 and a providing unit 54, a tone mapping unit 50n1, a local dimming unit 50n3, an LCD 50n5, and an LED. A controller 50n7 and a display device 50n including an LED backlight 50n9 are included.

  The display device 50n including the tone mapping unit 50n1, the local dimming unit 50n3, the LCD 50n5, the LED controller 50n7, and the LED backlight 50n9 included in the display system 5 according to the present embodiment is a tone included in the display system 4 according to the fourth embodiment. This corresponds to a display device 40n including a mapping unit 40n1, a local dimming unit 40n3, an LCD 40n5, an LED controller 40n7, and an LED backlight 40n9.

  In the present embodiment, the setting unit 52 sets the setting values described in the fourth embodiment. The providing unit 54 includes the set setting value in the metadata of the HDR image data and provides the set value to the display device 50n.

  The tone mapping unit 50n1 of the display device 50n performs tone mapping on the HDR image data of the image n with reference to the metadata.

[Embodiment 6]
The following will describe another embodiment of the present invention with reference to FIGS.

  In the display system 6 according to the present embodiment, unlike the display system 4 according to the fourth embodiment, the display device 60n does not include the tone mapping unit, the multi-display controller 60 includes the setting unit 62 and the providing unit 64, and the local dimming unit. 60n3, LCD 60n5, LED controller 60n7, and display device 60n including LED backlight 60n9.

  The display device 60n including the LCD 60n5 and the LED backlight 60n9 included in the display system 6 according to the present embodiment corresponds to the display device 40n including the LCD 40n5 and the LED backlight 40n9 included in the display system 4 according to the fourth embodiment, respectively.

  For the sake of convenience, the description of the same contents as those described in the embodiment will be omitted, and only the contents different from the contents described in the embodiment will be described.

  In the present embodiment, the setting unit 62 sets the setting values described in the fourth and fifth embodiments, and also performs tone mapping for image data using the set setting values. Then, the providing unit 64 provides each display device 60n with data subjected to tone mapping and adjusted in white balance, temperature correction, and the like.

  That is, in the present embodiment, each display device 60n displays an image without adjusting tone mapping, white balance, temperature correction, and the like.

  Next, an example of control in the display system 4 according to the present embodiment will be described with reference to the flowchart in FIG.

  The processing of steps S60 to S74 in FIG. 11 is executed by the multi-display controller 60, and the processing of steps S76 to S82 in FIG. 11 is executed by the display device 60n.

  First, steps S60 to S74 executed by the multi-display controller 60 will be described.

(Step S60)
The multi display controller 60 acquires image data.

(Step S62)
The setting unit 62 of the multi-display controller 60 generates data used for tone mapping processing applied to the image data in accordance with the information regarding luminance. The information on luminance may be information including information on the luminance of the LED backlight 60n9m, and is information on the maximum value (maximum PWM value) of the duty ratio of the backlight control signal supplied to the LED backlight 60n9m. There may be.

  The process of the multi-display controller 60 in step S62 can be described with reference to steps S50 to 56 in FIG. 4 in the same manner as the process of the multi-display controller 10 in step S12 described above.

(Step S64)
The multi-display controller 60 generates data of an image n obtained by trimming an image indicated by the acquired image data for each display device 60n.

(Step S66)
The multi-display controller 60 performs tone mapping processing on the data of the image n using the data generated in step 62.

(Step S68)
The multi-display controller 60 generates LED data and LCD data based on the image n data for each display device 60n.

(Step S70)
The multi display controller 60 adjusts the LED data.

(Step S72)
The setting unit 62 refers to information related to local dimming executed by the local dimming unit 60n3 of the display device 60n, and sets a correction coefficient common to all the display devices 60n as a set value.

(Step S74)
The setting unit 62 calculates information related to the luminance after setting the correction coefficient for the next frame according to the estimated displayable luminance of the display device 60n and the set correction coefficient.

  Next, steps S76 to S82 executed by the display device 60n will be described.

(Step S76)
The local dimming unit 60n3 obtains, from the providing unit 64, data on which tone mapping has been performed and white balance, temperature correction, and the like have been adjusted.

(Step S78)
The local dimming unit 60n3 acquires a correction coefficient common to all the display devices 60n from the providing unit 64.

(Step S80)
The local dimming unit 60n3 corrects the LED data acquired in step S76 according to the correction coefficient acquired in step S78.

(Step S82)
The LCD 60n5 and the LED backlight 60n9 display an image based on the LCD data generated by the local dimming unit 60n3 and the LED data corrected according to the correction coefficient set by the setting unit 12 by the local dimming unit 60n3. . Thereby, the display device 60n can display an image so as to have a luminance corresponding to the set value set by the setting unit 62.

[Example of software implementation]
The control blocks (particularly the setting units 12, 22, 32, 42, 52, 62 and the providing units 14, 24, 34, 44, 54, 64) of the display control devices 10, 20, 30, 40, 50, 60 are integrated. It may be realized by a logic circuit (hardware) formed on a circuit (IC chip) or the like, or may be realized by software using a CPU (Central Processing Unit).

  In the latter case, the display control device 10, 20, 30, 40, 50, 60 is a CPU that executes instructions of a program that is software that realizes each function, and the program and various data can be read by a computer (or CPU). ROM (Read Only Memory) or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) for expanding the program, and the like. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. 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. 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]
The display control devices 10, 20, 40, 50 according to the aspect 1 of the present invention include control units that control image display (tone mapping units 10n1, 20n1, 40n1, 50n1, local dimming units 10n3, 20n3, 40n3, 50n3). In the display control devices 10, 20, 40, 50 for controlling each of the plurality of display devices 10n, 20n, 40n, 50n, the control common to each of the plurality of display devices 10n, 20n, 40n, 50n Setting units 12, 22, 42, 52 for setting setting values related to luminance used for controlling image display by the units (tone mapping units 10 n 1, 20 n 1, 40 n 1, 50 n 1, local dimming units 10 n 3, 20 n 3, 40 n 3, 50 n 3) And for each of the plurality of display devices 10n, 20n, 40n, 50n And a providing unit 14,24,44,54 to provide the setting value.

  According to the above configuration, it is possible to display an image using a plurality of display devices 10n, 20n, 40n, and 50n equipped with a local dimming function while suppressing variations in luminance.

  In the display control devices 10 and 40 according to the second aspect of the present invention, in the first aspect, the setting units 12 and 42 are applied to the image data as the set values in each of the plurality of display devices 10n and 40n. A function used for tone mapping may be set.

  According to said structure, common tone mapping can be performed to image data in each of display apparatus 10n, 40n.

  In the display control devices 20 and 50 according to the aspect 3 of the present invention, in the aspect 1, the providing units 24 and 52 are included in the metadata of the image data supplied to each of the plurality of display devices 20n and 50n. What is necessary is just to provide the said setting value.

  According to said structure, the setting value regarding a brightness | luminance included in image data can be supplied to each of display apparatus 20n, 50n.

  The display control devices 30 and 60 according to the fourth aspect of the present invention are common to each of the plurality of display devices 30n and 60n in the display control devices 30 and 60 that control the display of each of the plurality of display devices 30n and 60n. , Setting units 32 and 62 for setting set values related to luminance, and tone mapping is performed on the image data using the set values, and the tone mapped image data is provided to each of the plurality of display devices 30n and 60n. Providing units 34 and 64.

  According to said structure, an image can be displayed using several display apparatus 30n, 60n carrying a local dimming function, suppressing the dispersion | variation in a brightness | luminance.

  The display control device 10, 20, 30, 40, 50, 60 according to the aspect 5 of the present invention is the display unit 10, 22, 32, 42, 52, 62 according to any one of the aspects 1-4 described above. The set value is supplied to a plurality of backlights (LED backlights 10n9, 20n9, 30n9, 40n9, 50n9, 60n9) of each of the plurality of display devices 10n, 20n, 30n, 40n, 50n, 60n. The backlight control signal duty ratio may be set with reference to the maximum value for each of the display devices 10n, 20n, 30n, 40n, 50n, and 60n.

  According to said structure, since the brightest location for every display apparatus 10n, 20n, 30n, 40n, 50n, 60n is referred, an image can be displayed with reference to the state with the largest supply electric power.

  The display control device 10, 20, 30, 40, 50, 60 according to aspect 6 of the present invention is the above-described aspect 5, in which the setting units 12, 22, 32, 42, 52, 62 You may set according to the smallest value among the maximum values for every display apparatus 10n, 20n, 30n, 40n, 50n, 60n.

  According to the above configuration, the set value is set according to the smallest value among the maximum values for each of the display devices 10n, 20n, 30n, 40n, 50n, and 60n, so that power saving and low heat generation can be achieved. it can.

  The display control devices 10, 20, and 30 according to the seventh aspect of the present invention are the display control devices 10, 20, and 30 according to any one of the first to sixth embodiments, in which the setting units 12, 22, and 32 set the set values to the plurality of display devices 10n. , 20n, 30n may be set according to the displayable luminance.

  According to said structure, a brightness | luminance can be set according to the condition of the image which display apparatus 10n, 20n, 30n actually displays.

  The display control devices 40, 50, 60 according to the eighth aspect of the present invention are the display control devices 40, 50, 60 according to any one of the first to sixth embodiments, wherein the setting units 42, 52, 62 change the set values to the plurality of display devices 40n. , 50n, and 60n, the displayable luminance may be estimated and set according to the estimated luminance.

  According to said structure, a brightness | luminance can be set even if it does not know the condition of the image which the display apparatuses 40n, 50n, and 60n actually display.

  A display system 1, 2, 3, 4, 5, 6 according to the ninth aspect of the present invention includes the display control device 10, 20, 30, 40, 50, 60 according to any one of the first to eighth aspects. A display system 1, 2, 3, 4, 5, 6 comprising a plurality of display devices 10n, 20n, 30n, 40n, 50n, 60n according to any one of the above aspects 1-8, Each of the plurality of display devices 10n, 20n, 30n, 40n, 50n, 60n displays an image so as to have a luminance corresponding to the set value.

  According to the above configuration, it is possible to display an image using a plurality of display devices 10n, 20n, 30n, 40n, 50n, and 60n equipped with a local dimming function while suppressing variations in luminance.

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

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

1, 2, 3, 4, 5, 6 Display system 10, 20, 30, 40, 50, 60 Multi-display controller (display control device)
10n, 20n, 30n, 40n, 50n, 60n Display device 10n1, 20n1, 30n1, 40n1, 50n1, 60n1 Tone mapping unit (control unit)
10n3, 20n3, 30n3, 40n3, 50n3, 60n3 Local dimming unit (control unit)
10n9, 20n9, 30n9, 40n9, 50n9, 60n LED backlight (backlight)
12, 22, 32, 42, 52, 62 setting unit 14, 24, 34, 44, 54, 64 providing unit

Claims (11)

In a display control device that controls each of a plurality of display devices including a control unit that controls display of an image,
A setting unit that is a setting value common to each of the plurality of display devices and is used for controlling display of an image by the control unit;
A providing unit that provides the set value to each of the plurality of display devices ;
The setting unit sets a function used for tone mapping applied to image data in each of the plurality of display devices as the setting value.
The setting unit sets the setting value with reference to a maximum value for each display device of a duty ratio of a backlight control signal supplied to the plurality of backlights included in each of the plurality of display devices. <br/> A display control device characterized by the above. The display control apparatus according to claim 1, wherein the providing unit provides the set value by including it in metadata of image data supplied to each of the plurality of display apparatuses. In a display control device that controls the display of each of a plurality of display devices,
A setting unit that is a setting value common to each of the plurality of display devices, and that sets a setting value related to luminance;
Providing tone mapping to the image data using the set value, and providing the image data subjected to tone mapping to each of the plurality of display devices ,
The setting unit sets the setting value with reference to the maximum value for each display device of the duty ratio of the backlight control signal supplied to the plurality of backlights included in each of the plurality of display devices. ,
The display control apparatus , wherein the setting unit sets a correction coefficient for correcting data used for controlling the plurality of backlights as the set value . The setting unit, the setting value, the display control device according to any one of claims 1 to 3, characterized in that set in accordance with the smallest value among the maximum value for each said display device. The setting unit, the setting value, the display control device according to any one of claim 1 to 4, characterized in that set in accordance with information from the plurality of display devices. The display control device according to claim 5 , wherein the setting unit sets the setting value according to a luminance that can be displayed on each of the plurality of display devices. The setting unit, the setting value, the plurality of displaying the displayable brightness estimated in each of the devices, in any one of claims 1-4, characterized in that the set according to the estimated luminance The display control apparatus described. A display control device according to any one of claims 1 to 7 ,
A display system including a control unit that controls display of an image, and a plurality of display devices controlled by the display control device,
Each of the control units of the plurality of display devices controls display of an image so as to have a luminance corresponding to the set value. A television receiver comprising the display system according to claim 8 and a tuner.   A display control program for causing a computer to function as the display control apparatus according to claim 1, wherein the display control program causes the computer to function as the setting unit and the providing unit. The computer-readable recording medium which recorded the display control program of Claim 10 .

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