JP2013015774A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device that performs power-saving operation in the season when suppliable power to power demand is tight.SOLUTION: An image display device includes image display means (a liquid crystal display 6) for displaying an image, display control means 3 for controlling the liquid crystal display 6, a temperature sensor 1 for measuring the surrounding temperature, and power saving setting means 2 which, if the measured temperature of the temperature sensor 1 exceeds a first threshold, instructs the display control means 3 to cause the liquid crystal display 6 to perform power-saving operation.

Description

  The present invention relates to a video display device that performs a power saving operation when power supply and demand is tight.

  In general, the operation rate of air conditioners increases in summer, and the power consumption (demand power) of society as a whole is tighter than the power that can be supplied. If the power demand exceeds the power that can be supplied, a power outage will occur, causing serious damage to social life and corporate activities. Therefore, it is extremely important to control the entire society so that the demand power does not exceed the power that can be supplied.

  A liquid crystal display, which is one of the conventional video display devices, uses a liquid crystal panel as a display device and emits a backlight to irradiate the liquid crystal panel. In such a liquid crystal display device, the brightness of the screen is adjusted by adjusting the brightness of the backlight to control the power consumption.

  As an example of adjusting the brightness of the backlight, for example, Patent Document 1 discloses a video display device equipped with an optical sensor. This video display device measures ambient illuminance with an optical sensor and adjusts the luminance of the backlight based on the measurement result. For example, the brightness of the backlight of the liquid crystal is controlled to be high when the ambient illuminance is high, and the brightness of the backlight is controlled to be low when the ambient illuminance is low. As a result, an image that is always easy for the user to view is displayed regardless of the surrounding illuminance.

  Regarding power consumption control, Patent Document 2 proposes a video display device that controls power consumption in accordance with a power charge of an electric power company. Electricity charges vary depending on the time zone and rate plan.For example, while displaying a darker image during hours when the electricity amount fee is high, power consumption is reduced, while when the electricity amount fee is low, it is brighter. By displaying the video, it provides bright and dynamic video without relatively increasing the electricity bill.

JP 2009-276425 A JP 2010-091643 A

  However, the video display device described in Patent Document 2 is intended to reduce electricity charges generated in one household, and is not intended to reduce power consumption when power supply and demand is tight. .

  Therefore, an object of the present invention is to provide a video display device that performs a power saving operation at a time when power supply and demand is tight.

  A first image display device according to the present invention includes an image display means for displaying an image, a display control means for controlling the image display means, a temperature sensor for measuring an ambient temperature, and a measured temperature of the temperature sensor. And a power saving setting means for instructing the display control means to cause the video display means to perform a power saving operation when the first threshold value is exceeded.

  In addition, the second video display device according to the present invention obtains from the outside power supply and demand information including information on video display means for displaying video, display control means for controlling the video display means, and power supply and demand tightness time. Power supply / demand information acquisition means for performing power saving setting means for instructing the display control means to cause the video display means to perform power saving operation based on information related to the power supply / demand tightness period.

  The first video display device according to the present invention includes power saving setting means for instructing the display control means to perform power saving operation of the video display means when the temperature measured by the temperature sensor exceeds the first threshold. Power saving operation can be performed by judging the power supply / demand tightness period from the temperature of the power.

  The second video display device according to the present invention further comprises power saving setting means for instructing the display control means to operate the video display means in a power saving operation based on the power supply / demand information including information related to the power supply / demand tightness period. Therefore, it is possible to perform a power saving operation when the power supply and demand is tight.

1 is a block diagram showing a configuration of a video display device according to Embodiment 1. FIG. 3 is a flowchart showing an operation of the video display apparatus according to the first embodiment. 6 is a block diagram illustrating a configuration of a video display device according to Embodiment 2. FIG. 6 is a block diagram illustrating a configuration of a video display device according to Embodiment 3. FIG. 10 is a flowchart illustrating an operation of the video display device according to the third embodiment. FIG. 10 is a block diagram illustrating a configuration of a video display device according to Embodiment 4. It is a figure which shows an example of the electric power supply-and-demand information database which the video display apparatus concerning Embodiment 4 uses. 10 is a flowchart showing the operation of the video display apparatus according to the fourth embodiment. FIG. 10 is a block diagram illustrating a configuration of a video display device according to a fifth embodiment. FIG. 10 is a block diagram illustrating a configuration of a video display device according to a sixth embodiment. It is a figure which shows an example of the electric power supply-and-demand information database which the video display apparatus concerning Embodiment 6 uses. 14 is a flowchart illustrating an operation of the video display apparatus according to the sixth embodiment.

  In this specification, a liquid crystal display device having a liquid crystal display will be described as an example of a video display device. However, a video display device having a display device other than a liquid crystal display, such as a plasma display or an organic EL display, is also described. The present invention is applicable.

(Embodiment 1)
In summer, a large number of air conditioners such as air conditioners are used in homes, workplaces, company factories, etc., so the summer is a period of tight power supply and demand, where power demand is generally tight with respect to power supply. Therefore, the video display device according to the present embodiment operates in the power saving mode and reduces power consumption when the operation time is determined to be summer.

<Configuration>
FIG. 1 shows a configuration of a liquid crystal display device as an example of a video display device according to the first embodiment. This liquid crystal display device includes a power saving setting means 2, a liquid crystal display 6, and a display control means 3 for controlling the liquid crystal display 6 in addition to a temperature sensor 1 that measures the ambient temperature.

  The liquid crystal display 6 includes a liquid crystal panel 7 as a display device and a backlight 8 as a light source that irradiates the liquid crystal panel 7.

  The display control unit 3 includes an image quality correction unit 5 that corrects the image quality of the liquid crystal panel 7 and a backlight control unit 4 that controls the light emission luminance of the backlight 8.

  The temperature sensor 1 measures the ambient temperature and sends the measurement result to the power saving setting unit 2 as temperature information.

  The power saving setting means 2 receives temperature information from the temperature sensor 1 and determines whether or not the operation time of the device is summer, and if it is summer, sets the operation mode of the device to the power saving mode. Reduce power consumption.

<Operation>
The power saving setting unit 2 determines whether or not the operation time is summer by comparing the measured temperature of the temperature sensor 1 with a threshold value. For example, the room where this equipment is installed is often over 24 ° C in summer, even if the air conditioner is in operation, so if the threshold is set to 24 ° C and the measured temperature exceeds 24 ° C, to decide. In addition to setting the threshold value of the measured temperature in advance, the user may arbitrarily set a value corresponding to the usage environment via a user interface (not shown).

  When the power saving setting means 2 determines that it is summer, it instructs the display control means 3 to operate the liquid crystal display 6 to save power. That is, the power saving setting unit 2 changes the parameter (backlight control value) for controlling the light emission luminance of the backlight 8 to a power saving value that lowers the light emission luminance from the normal value. The backlight control unit 4 controls the backlight 8 according to the backlight control value changed to the power saving value by the power saving setting unit 2, thereby reducing the light emission luminance of the backlight 8 and suppressing power consumption. .

  Naturally, when the light emission luminance of the backlight 8 is lowered, the image displayed on the liquid crystal panel 7 is dark and difficult to see. Therefore, the power saving setting unit 2 instructs the image quality correcting unit 5 to correct the image quality setting of the liquid crystal panel 7. Here, the correction of the image quality setting is, for example, correction for increasing the contrast. The image quality correction means 5 corrects the image quality setting of the liquid crystal panel 7 based on the image quality correction instruction from the power saving setting means 2 so that the video is not difficult to see.

  The operations of the power saving setting unit 2, the backlight control unit 4, and the image quality correction unit 5 described above will be described again using the flowchart of FIG.

  First, the power saving setting unit 2 refers to the temperature information from the temperature sensor 1 and determines whether the temperature is 24 ° C. or higher (step S201). When the temperature is less than 24 ° C. (No in step S201), it is determined that the operation timing of the video display device is not summer, and a normal value is set as the backlight control value (step S220). In this case, image quality correction is not performed.

  When the temperature is 24 ° C. or higher (Yes in step S201), it is determined that the operation timing of the video display device is summer, and a power saving value is set as the backlight control value (step S202). Since the light emission luminance of the backlight 8 is lower than normal based on the power saving value, the power saving setting unit 2 issues an image quality correction instruction to the image quality correcting unit 5. Then, the image quality correction unit 5 performs image quality correction based on the image quality correction instruction so that the display image on the liquid crystal panel 7 does not become difficult to see (step S203).

  In step S <b> 204, the backlight control unit 4 controls the light emission luminance of the backlight 8 in accordance with the backlight control value set by the power saving setting unit 2, and an image is displayed on the liquid crystal panel 7. When the normal value is set as the backlight control value, the backlight 8 emits light at normal luminance, and when the power saving value is set as the backlight control value, the backlight 8 has lower luminance than normal. Flashes on.

  As described above, in the video display apparatus according to the present embodiment, when the power saving setting unit 2 determines that the operation time is summer, the light emission brightness of the backlight 8 is reduced. Reduce power consumption during tight periods.

  In order to avoid frequent switching between the power saving mode and the normal mode, once the setting is changed, the setting may not be changed for a certain period of time, or the measured temperature threshold value of the temperature sensor 1 may be provided with hysteresis. .

  In the power saving mode, the light emission brightness of the backlight 8 is reduced. However, the power consumption may be reduced by changing the image quality setting of the liquid crystal panel 7.

<Effect>
The video display apparatus according to Embodiment 1 includes a liquid crystal display 6 (video display means) that displays video, a display control means 3 that controls the liquid crystal display 6, a temperature sensor 1 that measures the ambient temperature, and a temperature sensor. When the measured temperature of 1 exceeds the first threshold value, the display control means 3 is instructed to cause the liquid crystal display 6 to perform a power saving operation. It can be determined whether or not there is. By performing power-saving operations in summer, power consumption is suppressed during periods of tight power supply and demand.

  In the video display device according to the first embodiment, the video display means includes the liquid crystal panel 7 and the backlight 8 that irradiates the liquid crystal panel 7, and the display control means 3 reduces the luminance of the backlight 8. Since the video display means operates in a power saving manner, the power saving operation is performed in the summer, thereby suppressing the power consumption when the power supply and demand is tight.

(Embodiment 2)
In the first embodiment, it is determined whether or not the operation timing of the apparatus is the summer season from the ambient temperature. However, in the second embodiment, the operation timing of the apparatus is determined with higher accuracy by measuring the ambient humidity. .

<Configuration>
FIG. 3 shows a configuration of a liquid crystal display device as an example of a video display device according to the second embodiment. The configuration of the liquid crystal display device includes a humidity sensor 9 that measures ambient humidity. Since the other configuration is the same as the configuration of the video display apparatus according to the first embodiment shown in FIG.

<Operation>
The humidity sensor 9 measures the humidity around the apparatus and passes the measurement result to the power saving setting unit 2 as humidity information. The power saving setting means 2 determines whether or not the operation time of the apparatus is summer based on the measured temperature of the temperature sensor 1 and the measured humidity of the humidity sensor 9.

  The discomfort index is generally known as a numerical value obtained from a combination of temperature and humidity. The discomfort index is expressed by equation (1) when the temperature is a (° C.) and the humidity is b (%).

  0.81a + 0.01b (0.99a-14.3) +46.3 (1)

  If the discomfort index exceeds 80, most people feel hot and uncomfortable, so there is a high probability of operating the air conditioner. Therefore, the power saving setting means 2 calculates the discomfort index using the equation (1) from the measured temperature and the measured humidity. The threshold of the discomfort index is set to 80, and when the discomfort index is 80 or more, the operation time is determined to be summer. In addition to setting the threshold of the discomfort index in advance, the user may arbitrarily set a value corresponding to the usage environment via a user interface (not shown).

  If it is determined that the operation time is summer, the operation mode is changed from the normal mode to the power saving mode, and control to lower the light emission luminance of the backlight 8 is performed. Since the operation of the video display device in the normal mode and the power saving mode is the same as that of the first embodiment, the description thereof is omitted.

  As described above, when the power saving setting unit 2 determines that the operation time is the summer based on the temperature information and the humidity information, the light emission brightness of the backlight 8 is reduced to reduce the power consumption during the power supply / demand tightness period. In addition to the temperature information, the humidity information is used as a material for determining the operation time, so it is possible to accurately determine the power supply / demand tightness time.

  In order to avoid frequent switching between the power saving mode and the normal mode, once the operation mode is changed, it may not be changed for a certain period of time, or the discomfort index threshold may be given hysteresis.

  In the power saving mode, the light emission brightness of the backlight 8 is reduced. However, the power consumption may be reduced by changing the image quality setting of the liquid crystal panel 7.

<Effect>
The video display apparatus according to the second embodiment includes a humidity sensor 9 that measures the ambient humidity, and the power saving setting unit 2 has a discomfort index (from the measured temperature of the temperature sensor 1 and the measured humidity of the humidity sensor 9). When the predetermined index) exceeds the second threshold, the display control means 3 is instructed to operate the liquid crystal display 6 (video display means) in a power-saving manner. Reduce power consumption. In addition to temperature information, humidity information is used as a material for determining the operation time, so it is possible to determine the power supply / demand tightness time with high accuracy.

(Embodiment 3)
In the third embodiment, date information (date information and time information) is used in addition to the temperature information to determine whether or not the operation timing of the apparatus is summer.

<Configuration>
FIG. 4 shows a configuration of a liquid crystal display device which is an example of a video display device according to the third embodiment. The liquid crystal display device according to the third embodiment includes a calendar 10 indicating the current date and a clock 11 indicating the current time as a date and time means for measuring the current date and time. Since the configuration other than this is the same as the configuration of the liquid crystal display device according to Embodiment 1 shown in FIG.

<Operation>
The operation of the liquid crystal display device according to Embodiment 3 will be described with reference to the flowchart of FIG. The flowchart in FIG. 5 is the same as the flowchart in FIG. 2 except that step S230 is added to the flowchart in FIG. 2 described in the first embodiment. Therefore, only step S230 will be described below.

  When the power saving setting means 2 determines that the measured temperature is equal to or higher than the threshold of 24 ° C. (Yes in step S201), the power saving setting means 2 indicates that the current date and time obtained from the calendar 10 and the clock 11 are the power saving period. It is judged whether it is in (step S230). Here, the power saving period is a period during which it is determined that the demand power is in a tight state relative to the power that can be supplied, and is set in advance. For example, in the time zone from 9:00 to 17:00 on weekdays in July and August, most of the air conditioners are operating and the company factory is also in operation, so this period is set as a power saving period.

  When the power saving setting unit 2 determines that the current date and time is within the power saving period (Yes in step S230), the backlight control value is set to the power saving value (step S202). On the other hand, when it is determined that the current date and time is outside the power saving period (No in step S230), the backlight control value is set to a normal value.

  Since the subsequent operation is the same as the operation in the flowchart of FIG. 2 described in the first embodiment, the description thereof is omitted.

  As described above, the video display device according to the third embodiment performs the power saving operation only when the operation time is determined to be summer from the measured temperature and the current date and time is within the power saving period. Even if the measured temperature is higher than the threshold value, normal operation will continue if the current date and time is outside the power saving period, so only this device has an exceptionally high temperature environment when power supply and demand are not tight. Prevents power saving operation due to the installation underneath.

  In the above description, an example is shown in which the date and time means is added to the configuration of the video display device of the first embodiment. However, the date and time holding unit is added to the configuration of the video display device of the second embodiment including the humidity sensor 9. You may do it. In this case, the video display apparatus determines that the operation time is summer from the discomfort index calculated from the measured temperature and measured humidity, and performs the power saving operation only when the current date and time is within the power saving period.

  Further, the operation mode may be determined based only on whether the current date and time is within the power saving period. In this case, the temperature sensor 1 and the humidity sensor 9 are not necessary, and the configuration of the video display device can be simplified.

<Effect>
The video display device according to the third embodiment is provided with sundial time means (calendar 10 and clock 11) for measuring the current date and time in addition to the temperature sensor 1 and the humidity sensor 9, and the power saving setting means 2 When the current date / time falls within a power saving period set in advance corresponding to the tight time, the display control means 3 is instructed to operate the liquid crystal display 6 (video display means) in a power saving operation. The operating time is determined as summer from the measured temperature, or the operating time is determined as summer from the discomfort index calculated from the measured temperature and measured humidity, and power saving operation is performed only when the current date and time is within the power saving period. By doing so, it is installed in an exceptionally high temperature environment or unpleasantness index environment even though it is not the time when power supply and demand is tight, preventing it from operating with power saving.

  The video display device according to the third embodiment includes a liquid crystal display 6 (video display means) for displaying video, a display control means 3 for controlling the video display means, and a sundial time means (calendar) for measuring the current date and time. 10 and the clock 11), and the power saving setting for instructing the display control means 3 to perform the power saving operation of the video display means when the current date and time corresponds to the power saving period set in advance corresponding to the power supply / demand tightness period. Means 2 are provided. By determining the operation mode depending on whether or not the current date and time is included in the power saving period, it is possible to suppress power consumption when the power supply and demand is tight. Further, since the temperature sensor and the humidity sensor are not required, the configuration of the apparatus can be simplified.

(Embodiment 4)
Most video display devices in recent years can be connected to a network. Therefore, the video display apparatus according to the fourth embodiment acquires power supply / demand information from the power supply / demand information database on the network, and determines the operation mode with reference to this information. As a result, the operation mode is determined regardless of the installation environment. Therefore, the operation mode is determined under the same determination condition in the plurality of video display devices.

<Configuration>
FIG. 6 shows a configuration of a liquid crystal display device which is an example of a video display device according to the fourth embodiment. In this liquid crystal display device, the temperature sensor 1 is removed from the video display device according to the third embodiment shown in FIG. 4, and a network connection unit 12 and a regional information storage unit 14 are added.

  The network connection unit 12 operates as a power supply / demand information acquisition unit, and connects to the network to acquire various information including power supply / demand information. The area information storage means 14 stores the area name where the video display device is installed as area information. The regional information can be preset in the video display device by the user via a user interface (not shown), for example.

<Operation>
Each time a fixed time elapses in the clock 11, the power saving setting unit 2 accesses the power supply / demand information database 13 stored in a server or the like on the network via the network connection unit 12, and acquires power supply / demand information.

  FIG. 7 shows an example of the power supply / demand information database 13. The power supply and demand information database 13 describes the power that can be supplied and the predicted demand power as power supply and demand information for each date and time zone for each region such as Tokyo and Osaka. Furthermore, when the predicted demand power exceeds the suppliable power, ×, when the predicted demand power is close to the suppliable power, △, when the suppliable power has a margin for the expected demand power, etc. In addition, the determination result regarding the power supply / demand tight situation is described.

  The power supply / demand information database 13 is input to the power saving setting unit 2 at regular intervals via the network connection unit 12. The power saving setting means 2 searches the data string in the power supply and demand information database 13 corresponding to the area name stored in the area information storage means 14. For example, when “Tokyo” is stored in the area information storage unit 14, the above table in which “area” corresponds to “Tokyo” in the power supply and demand information database 13 shown in FIG. 7 is selected. Then, based on the date and time information obtained from the calendar 10 and the clock 11, when the current time corresponds to a time zone determined to be Δ or ×, the power saving mode is operated. According to the example of FIG. 7, the video display device installed in Tokyo operates in the power saving mode on April 25 from 9:00 to 12:00, from 12:00 to 15:00, and from 15:00 to 18:00. It operates in the normal mode in the time zone.

  FIG. 8 is a flowchart showing the operation of the video display apparatus according to the fourth embodiment. In FIG. 8, when the power saving setting unit 2 acquires the power supply / demand information on the network (step S240), the database 13 searches the database 13 for a data string that matches the region name stored in the region information storage unit 14 (step S240). S241). Next, data that matches the date and time information obtained from the calendar 10 and the clock 11 is further searched from the data string, and it is determined whether or not the determination result of the data is ◯. Thus, it is determined whether or not a power saving operation is necessary at the current date and time (step S242). If the determination result is ○, the power supply and demand is not tight, so a normal value is set for the backlight control value (step S220), and if the determination result is other than ○, a power saving value is set for the backlight control value. (Step S202). Since the subsequent operation is the same as that of the first embodiment, the description thereof is omitted.

  As described above, in the video display device according to the fourth embodiment, the power supply / demand information database 13 is referred to determine whether to operate in the power saving mode based on the power supply / demand information. The operation mode is determined with the same discrimination condition regardless of the installation environment. Therefore, when a large number of video display devices according to the present embodiment are installed in one area, when one video display device operates in the power saving mode, all other video display devices in the area are common. Because it operates in the power saving mode, the society as a whole has a great power saving effect.

<Effect>
The video display apparatus according to the fourth embodiment externally supplies power supply / demand information including information on a liquid crystal display 6 (video display means) for displaying video, display control means 3 for controlling the liquid crystal display 6, and power supply / demand tightness. The power supply / demand information acquisition means acquired from the power supply and the power saving setting means 2 for instructing the display control means 3 to operate the liquid crystal display 6 to save power based on the power supply / demand information. Can be reduced. In addition, if the same video display device is used, the operation mode is determined under the same determination condition regardless of the installation environment. Therefore, when a large number of video display devices according to the present embodiment are installed in one area, one unit is used. When the video display device operates in the power saving mode, all the other video display devices in the area operate in the power saving mode in common, so that the society as a whole has a great power saving effect.

  Moreover, since the power supply / demand information acquisition means (network connection means 12) acquires the power supply / demand information on the connected network, the means included in the normal video display device can be used to acquire the power supply / demand information. Does not require complicated configuration.

(Embodiment 5)
Many video display devices have a built-in broadcast wave receiver. In recent years, a service (download service) has been performed in which software is transmitted using a part other than broadcasting in a broadcast wave band to rewrite product software or solve problems. Therefore, the video display apparatus according to the fifth embodiment acquires a power supply / demand information database from the download service, and determines an operation mode according to the power supply / demand information.

  This embodiment is the same as the fourth embodiment except that the power supply / demand information database is acquired not from the network but from the broadcast wave. As a result, as in the video display device of the fourth embodiment, the same video display device can determine the operation mode under the same determination condition regardless of the installation environment.

<Configuration>
FIG. 9 shows a configuration of a liquid crystal display device which is an example of a video display device according to the fifth embodiment. In this liquid crystal display device, the network connection unit is removed from the configuration of the video display device according to the fourth embodiment shown in FIG. 6, and an antenna 15, a tuner 16, and an information extraction unit 17 are added.

  The tuner 16 selects a desired broadcast channel of the broadcast wave received by the antenna 15. The information extraction unit 17 can extract desired data from the broadcast channel selected by the tuner 16 and operates as a power supply / demand information acquisition unit that acquires a power supply / demand information database from the broadcast channel.

  Since the configuration other than this is the same as that of the video display device according to the fourth embodiment except that there is no network connection means, description thereof is omitted.

<Operation>
The broadcast wave received by the antenna 15 is input to the tuner 16. The tuner 16 selects a broadcast channel on which a download service is being performed. When the broadcast channel is selected, a data string is input to the information extraction unit 17. The information extraction unit 17 acquires a power supply / demand information database from the input data string and sends it to the power saving setting unit 2. The power supply and demand information database is, for example, as shown in FIG. 7, and the details thereof have already been described in the fourth embodiment, and therefore are omitted here.

  The power saving setting unit 2 determines the operation mode of the apparatus based on the power supply / demand information database, and the details thereof are the same as those of the video display apparatus according to the fourth embodiment, and thus the description thereof is omitted.

  In the video display device of the fourth embodiment, it is determined whether or not to operate in the power saving mode with reference to the power supply and demand information. Determine the mode. Therefore, when there are many video display devices of this embodiment in one area, when one video display device operates in the power saving mode, the power saving mode is common to all the other video display devices. As a whole, it has a great power saving effect.

<Effect>
In the video display device according to the present embodiment, the power supply / demand information acquisition unit acquires the power supply / demand information from the received broadcast wave. Therefore, a unit included in a normal video display device can be used to acquire the power supply / demand information. Does not require a complicated configuration.

(Embodiment 6)
When there are many video display devices in one area, power-saving operation of only some video display devices can be performed without operating all the video display devices uniformly in the power saving mode to improve the tightness of power supply and demand. Is sufficient.

  Therefore, in the sixth embodiment, the power supply / demand tightness situation is controlled by controlling the ratio of the video display devices operating in the power saving mode with respect to all the video display devices existing in one area according to the power supply / demand tightness situation. Only the minimum video display device necessary to improve the power consumption is operated.

<Configuration>
FIG. 10 is a block diagram showing a configuration of a liquid crystal display device which is an example of a video display device according to the sixth embodiment. This liquid crystal display device includes a unique number storage means 18 in addition to the configuration of the liquid crystal display device according to the fourth embodiment shown in FIG. The unique number storage means 18 is, for example, a non-volatile memory, and a unique number that is different for each device is written in advance when the device is manufactured. Since the configuration other than the unique number storage unit 18 is the same as that of the liquid crystal display device of the fourth embodiment, the description thereof is omitted.

<Operation>
The power saving setting unit 2 connects to the network through the network connection unit 13 every time a predetermined time elapses in the clock 11, accesses the power supply / demand information database 13 stored on the network, and acquires power supply / demand information. To do.

  An example of the power supply and demand information database is shown in FIG. This power supply and demand information database is basically the same as the power supply and demand information database of FIG. 7, but in addition to the suppliable power and predicted demand power for each region name, date, and time zone, the “target number end” is entered. Is different.

  The power saving setting unit 2 searches the power supply / demand information database based on the region name stored in the region information storage unit 14. For example, if the area name is Tokyo, the data string corresponding to the area of Tokyo, that is, the upper table of FIG. 11 is selected.

  Further, date / time information obtained from the calendar 10 and the clock 11 is referred to. If the current time falls within the time zone determined as ◯, the normal mode operation is continued. If the current time falls within the time zone determined as Δ or ×, the end of the target number is referenced next.

  Here, the end of the target number is the end of the unique number of the video display device to be operated in the power saving mode. For example, assuming that the end of the unique number stored in the unique number storage means 18 is 4, in the example of FIG. 11, the video display device operates in the power saving mode at 12 to 15 on April 25, 2011. Do.

  The operation of the video display apparatus described above will be described again using the flowchart of FIG.

  In FIG. 12, when the power saving setting unit 2 acquires power supply / demand information on the network (step S240), the database 13 searches the database 13 for a data string that matches the region name stored in the region information storage unit 14 (step S240). S241). Next, data that matches the date and time information obtained from the calendar 10 and the clock 11 is further searched from the data string, and it is determined whether or not the determination result of the data is ◯. Thus, it is determined whether or not a power saving operation is necessary at the current date and time (step S242). If the determination result is ◯, it is determined that the power saving operation is unnecessary because the power supply and demand is not tight (No in step S242), and the normal value is set as the backlight control value (step S220). If the determination result is Δ or ×, it is determined that a power saving operation is necessary (Yes in step S242), and the process proceeds to step S250.

  In step S250, it is determined whether or not the unique number of the video display apparatus corresponds to the number of the target apparatus for power saving operation. The power saving setting unit 2 refers to the unique number of the video display device stored in the unique number storage unit 18 and determines whether or not the end of the unique number matches the end of the target number of the power supply and demand information. If they do not match (No in step S250), a normal value is set for the backlight control value (step S220), and if they match (Yes in step S250), a power saving value is set for the backlight control value (step S202). . Subsequent processing is the same as in the first embodiment, and a description thereof will be omitted.

  As described above, in the video display device according to the sixth embodiment, in addition to the determination of the power tightness time based on the power supply / demand information, the power saving mode is used only when the end of the unique number matches the end of the target number described in the power supply / demand information. Works with. Therefore, it is possible to control whether or not to set power saving for each product individually. In other words, the minimum necessary video display device is operated in the power saving mode by variably controlling the proportion of the video display devices installed in one area that are operated with the power saving setting according to the degree of power tightness. I can do it.

  In the above description, the end of the unique number is referred to determine whether or not it is a power saving operation target. However, the method for determining the power saving operation target device is not limited to this.

  In the above description, the video display device according to the sixth embodiment has been described as a configuration in which the unique number storage unit 18 is added to the configuration of the video display device according to the fourth embodiment, but the configuration of the video display device according to the fifth embodiment. The unique number storage means 18 may be added to the configuration. In this case, the acquisition source of power supply and demand information changes from the network to a broadcast wave, but the basic operation is the same.

<Effect>
In the video display device according to the sixth embodiment, each video display device has a unique number, and the power saving setting unit 2 is a device that is the target of the power saving operation in which the unique number is written in the power supply and demand information. When it corresponds to the unique number, the display control means 3 is instructed to cause the liquid crystal display 6 (video display means) to perform a power saving operation. As a result, since the operation mode can be controlled for each video display device, it is possible to operate the minimum number of video display devices necessary for resolving the tight power supply and demand in the power saving mode. .

  1 temperature sensor, 2 power saving setting means, 3 display control means, 4 backlight control means, 5 image quality correction means, 6 liquid crystal display, 7 liquid crystal panel, 8 backlight, 9 humidity sensor, 10 calendar, 11 clock, 12 network Connection means, 13 Electricity supply and demand information database, 14 Regional information storage means, 15 Antenna, 16 Tuner, 17 Information extraction means, 18 Unique number storage means.

Claims (9)

Video display means for displaying video;
Display control means for controlling the video display means;
A temperature sensor that measures the ambient temperature;
A power saving setting means for instructing the display control means to cause the video display means to perform a power saving operation when the temperature measured by the temperature sensor exceeds a first threshold;
Video display device. It is further equipped with a humidity sensor that measures the ambient humidity,
The power saving setting means is configured to cause the video display means to perform a power saving operation when a predetermined index calculated from the measured temperature of the temperature sensor and the measured humidity of the humidity sensor exceeds a second threshold. Instruct
The video display device according to claim 1. It further comprises a sundial clock means for measuring the current date and time,
The power saving setting means instructs the display control means to cause the video display means to perform a power saving operation when the current date and time corresponds to a power saving period set in advance corresponding to a power supply and demand tightness period.
The video display device according to claim 1. Video display means for displaying video;
Display control means for controlling the video display means;
A sundial clock means for measuring the current date and time,
A power saving setting means for instructing the display control means to perform a power saving operation of the video display means when the current date and time corresponds to a power saving period set in advance corresponding to a power supply / demand tightness period,
Video display device. Video display means for displaying video;
Display control means for controlling the video display means;
Electric power supply and demand information acquisition means for acquiring electric power supply and demand information including information related to power supply and demand tightness from outside,
A power saving setting means for instructing the display control means to cause the video display means to perform a power saving operation based on the power supply and demand information.
Video display device. The power supply / demand information acquisition means acquires the power supply / demand information on a connected network.
The video display device according to claim 5. The power supply and demand information acquisition means acquires the power supply and demand information from the received broadcast wave.
The video display device according to claim 5. The video display device has a unique number,
The power saving setting means is configured to cause the video display means to perform a power saving operation when the unique number corresponds to a unique number of a device to be a power saving operation described in the power supply and demand information. Instruct
The video display apparatus in any one of Claims 5-7. The video display means includes
LCD panel,
A backlight for illuminating the liquid crystal panel;
The display control means causes the video display means to perform a power saving operation by lowering a luminance of the backlight;
The video display apparatus in any one of Claims 1-8.

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