Image display device, power display method, and power display program

Abstract

The present invention provides an image display device, a power display method, and a power display program that present the user with the interconnected internal power consumption and external power supply. [Solution] The image display device comprises a power calculation unit and a display control unit. The power calculation unit calculates the internal power consumption within the image display device and the external power supplied to the outside of the image display device. The display control unit simultaneously or in a switching manner displays the internal power consumption and the external power supply calculated by the power calculation unit. The internal power consumption and the external power supply are supplied from a common power source or a plurality of interacting power sources.

Description

Technical Field

[0001] The present invention relates to an image display device, a power display method, and a power display program.

Background Art

[0002] When the internal power consumption and the external supply power of an image display device are supplied from a common power source or a plurality of power sources with interaction, the internal power consumption and the external supply power change in联动. Therefore, even when the state of the image display device itself does not change, the value of the internal power consumption may fluctuate due to changes in the external supply power or the like, and it has been a problem that it is difficult for the user to grasp the cause.

[0003] Related to the technology of displaying power consumption, Patent Document 1 discloses a technology of displaying the amount of self-consumed power within the generated power of a power consumer equipped with a solar power generation facility.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide an image display device, a power display method, and a power display program that present the interlocking internal power consumption and external supply power to the user.

Means for Solving the Problems

[0006] According to the present invention, an image display device having the following configuration is provided. [1] An image display device comprising a power calculation unit and a display control unit, wherein the power calculation unit calculates the internal power consumption within the image display device and the external power supplied to the outside of the image display device, the display control unit simultaneously or in a switching manner displays the internal power consumption and the external power supply calculated by the power calculation unit, and the internal power consumption and the external power supply are supplied from a common power source or a plurality of interacting power sources.

[0007] The following are examples of various embodiments of the present invention. The embodiments shown below can be combined with each other. [2] A power display method using an image display device, comprising a power calculation step and a display control step, wherein the power calculation step calculates the internal power consumption within the image display device and the external power supplied to the outside of the image display device, and the display control step simultaneously or by switching between displaying the internal power consumption and the external power supply calculated in the power calculation step, and the internal power consumption and the external power supply are supplied from a common power source or a plurality of interacting power sources. [3] A power display program that causes the processor to execute the power display method described in [2]. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an image display device that presents the user with the interconnected internal power consumption and external power supply. [Brief explanation of the drawing]

[0009] [Figure 1] This is a block diagram showing the configuration of power supply system 1. [Figure 2] This is a block diagram showing the hardware configuration of the power calculation device 10. [Figure 3] This is a block diagram showing an example of the functional configuration of the control unit 11 (power calculation device 10). [Figure 4] This figure shows an example of the correlation between the power before the first conversion and the power after the first conversion. [Figure 5] This is an example of a display screen shown on the display device 5. [Figure 6] This flowchart shows an example of the power calculation process performed by the power calculation device 10. [Figure 7] This is a block diagram showing a modified configuration of power supply system 1. [Figure 8] This figure shows a modified example of the correlation between the power before the first conversion and the power after the first conversion. [Figure 9] This figure shows a modified example of the correlation between the power before the first conversion and the power after the first conversion. [Figure 10] This is a block diagram showing a modified configuration of power supply system 1. [Figure 11] This is a block diagram showing the configuration of the image display device 50. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings. The features shown in the embodiments below are combinable with respect to each other. Furthermore, each feature constitutes an independent invention.

[0011] Figure 1 is a block diagram showing the configuration of a power supply system 1 according to an embodiment of the present invention. As shown in Figure 1, the power supply system 1 comprises a first power source 2, a first power conversion unit 3, a first resistor unit 4, a display device 5, a second resistor unit 6, an external device 7, a measurement unit 8, a switch 9, and a power calculation device 10. The display device 5 and the external device 7 function as "multiple first loads" according to the present invention. Furthermore, the first power source 2, the first power conversion unit 3, the first resistor unit 4, the display device 5, the second resistor unit 6, the external device 7, the measurement unit 8, the switch 9, and the power calculation device 10 in the power supply system 1 may be configured as a single device (for example, a monitoring device).

[0012] The power supply system 1 converts the first pre-conversion power (primary-side power, for example, 60 W) supplied from the first power supply source 2 into the first post-conversion power (secondary-side power, for example, 50 W) by the first power conversion unit 3, and divides the first post-conversion power to output it to a plurality of first loads (display device 5, external device 7) respectively.

[0013] The first power supply source 2 is, for example, a power supply unit, which is connected to a household AC outlet or the like via an electric cord or the like and outputs an AC voltage (for example, 100 V). Note that the first power supply source 2 is not limited to a power supply unit, and may be, for example, a 100 V system or 200 V system commercial power system, or USB PD (USB POWER DELIVERY) power supply. However, the first power supply source 2 does not necessarily have to be an element that supplies power by itself. For example, like the second power supply source 2A in FIG. 10, it may correspond to the power (second pre-conversion power, which is a part of the first post-conversion power) output from the first power conversion unit 3 and supplied to the second power conversion unit 3A.

[0014] The first power conversion unit 3 is, for example, an AC / DC converter, which converts the AC power supplied from the first power supply source 2 into DC power and generates the generated DC power to supply it to the display device 5 and the external device 7. Note that the first power conversion unit 3 may be any device that converts input power into output power in some manner. When a DC voltage is output from the first power supply source 2, it may be a DC / DC converter that transforms the DC voltage into a voltage suitable for the input of the display device 5 and the external device 7. Also, the first power conversion unit 3 may be configured to include both an AC / DC converter and a DC / DC converter, or may be configured to include, in addition to an AC / DC converter or a DC / DC converter, for example, a resistance circuit that generates power loss, or may be configured to include only the resistance circuit without including an AC / DC converter or a DC / DC converter.

[0015] The first resistance part 4 is, for example, a current detection resistor (shunt resistor) provided between the first power conversion part 3 and the display device 5 in the power supply path of the power supply system 1. One end of the first resistance part 4 is connected to the branch point 1a of the first resistance part 4 and the second resistance part 6 in the power supply path, and the other end of the first resistance part 4 is connected to the display device 5.

[0016] The display device 5 is, for example, a liquid crystal display device having a display panel including a plurality of pixels arranged on a substrate, and displays an image based on image data.

[0017] The second resistance part 6 is, for example, a current detection resistor (shunt resistor) provided between the first power conversion part 3 and the external device 7 in the power supply path of the power supply system 1. One end of the second resistance part 6 is connected to the branch point 1a of the first resistance part 4 and the second resistance part 6 in the power supply path, and the other end of the second resistance part 6 is connected to the external device 7.

[0018] The external device 7 is a peripheral device capable of USB connection, such as a notebook PC, a tablet, a household electrical appliance, a smartphone, a storage (storage device), etc.

[0019] The measurement part 8 includes, for example, a current sense amplifier. One end is connected to the branch point 1a of the first resistance part 4 and the second resistance part 6 in the power supply path, and the other end is connected to the switch 9. The current sense amplifier is a differential amplifier that outputs an analog voltage proportional to the current flowing through the load connected to the input.

[0020] The switch 9 receives the control of the measurement part 8 and switches the connection destination of the other end of the measurement part 8 between the other end of the first resistance part 4 and the other end of the second resistance part 6.

[0021] The measuring unit 8 measures the current flowing through the first resistor 4 or the current flowing through the second resistor 6 in a time-division manner. For example, when the measuring unit 8 controls the switch 9 and switches the connection destination of the other end of the measuring unit 8 to the other end of the first resistor 4 (as shown in Figure 1), it measures the voltage between the first resistor 4 (specifically, between one end and the other end of the measuring unit 8) to measure the current flowing through the first resistor 4 and, consequently, the current flowing through the display device 5. The measuring unit 8 then outputs first current information indicating the current value of the current flowing through the display device 5 to the power calculation device 10. The measuring unit 8 may also measure the current flowing through the display device 5 using, for example, a magnetic field detection type current sensor IC, instead of using the first resistor 4.

[0022] Furthermore, the measurement unit 8 controls the switch 9 to switch the connection destination of the other end of the measurement unit 8 to the other end of the second resistor unit 6, and measures the voltage between the second resistor unit 6 (specifically, between one end and the other end of the measurement unit 8) to measure the current flowing through the second resistor unit 6 and, consequently, the current flowing through the external device 7. The measurement unit 8 then outputs second current information, indicating the current value of the current flowing through the external device 7, to the power calculation device 10. Note that the measurement unit 8 may also measure the current flowing through the external device 7 using, for example, a magnetic field detection type current sensor IC, instead of using the second resistor unit 6.

[0023] The power supply system 1 may also be equipped with two measuring units instead of the measuring unit 8 and the switch 9, each measuring the current flowing through the first resistor 4 and the current flowing through the second resistor 6. However, compared to the case where two measuring units are provided, it is preferable that the measuring unit 8 measures the current flowing through the first resistor 4 or the current flowing through the second resistor 6 in a time-division manner, in order to reduce the circuit cost of the measuring circuit by combining the measuring circuits for measuring the currents flowing through the first resistor 4 and the second resistor 6 into one.

[0024] The power calculation device 10 is, for example, a microcontroller, and is configured to allow the user to accurately determine the power consumption of multiple first loads (in this embodiment, the display device 5 and external devices 7) installed in the power supply path of the power supply system 1.

[0025] Figure 2 is a block diagram showing the hardware configuration of the power calculation device 10 in this embodiment. As shown in Figure 2, the power calculation device 10 is configured to include a control unit 11, a storage unit 12, a communication unit 13, and an operation input unit 14. In this embodiment, an example in which the power calculation device 10 and the display device 5 are configured separately is described, but the power calculation device 10 and the display device 5 may be configured as a single unit.

[0026] The control unit 11 is, for example, a CPU (Central Processing Unit), a microprocessor, a DSP (Digital Signal Processor), and controls the overall operation of the power calculation device 10. The control unit 11 may be composed of various circuits such as ASICs (Application-Specific Integrated Circuits) and FPGAs (Programmable Logic Devices), or it may be composed of a combination of a processor and circuits.

[0027] A portion of the memory unit 12 is composed of, for example, RAM (Random Access Memory) or DRAM (Dynamic Random Access Memory), and is used as a work area when the control unit 11 executes processing based on various programs.

[0028] Furthermore, a portion of the storage unit 12 is, for example, a non-volatile memory such as ROM (Read Only Memory) or an HDD (Hard Disk Drive), which stores various data and programs used for processing by the control unit 11. The storage unit 12 can also maintain a database that includes one or more tables for recording various information and processing results.

[0029] The programs stored in the memory unit 12 include, for example, an OS (Operating System) for realizing the basic functions of the power calculation device 10, drivers for controlling various hardware, and programs for realizing various functions, and include a program that functions as the "power calculation program" of the present invention.

[0030] The communication unit 13 is, for example, a NIC (Network Interface Controller) and has the function of connecting to a communication line (not shown). Alternatively, the communication unit 13 may have functions to connect to a wireless LAN (Local Area Network), a wireless WAN (Wide Area Network), short-range wireless communication such as Bluetooth®, wired communication such as USB, and infrared communication, either in place of or in conjunction with the NIC. The power calculation device 10 is connected to the display device 5, etc., via the communication line and can send and receive various types of data between it and the display device 5, etc.

[0031] The operation input unit 14 consists of, for example, a keyboard, mouse, touch panel, switch, etc., and accepts input of various operations from the user using the power calculation device 10.

[0032] The control unit 11, storage unit 12, communication unit 13, and operation input unit 14 are electrically connected to each other via the system bus 15. Therefore, the control unit 11 can access the storage unit 12, understand the user's operation status of the operation input unit 14, and access various communication networks and display devices 5, etc., via the communication unit 13.

[0033] Figure 3 is a block diagram showing an example of the functional configuration of the control unit 11 of the power calculation device 10 in this embodiment. As shown in Figure 3, the control unit 11 has the functional configuration of an output power calculation unit 11a, a pre-conversion power calculation unit 11b, a converted power calculation unit 11c, a display control unit 11d, and a correlation setting unit 11e. In general, the control unit 11 of the power calculation device 10 has various other functions besides those described above, but here we will only describe the functions that are characteristic in that they determine the power consumption of a plurality of first loads (display device 5, external equipment 7) installed in the power supply path of the power supply system 1, and other known functions will not be shown or described.

[0034] The output power calculation unit 11a calculates the first output power to be output to the display device 5 and the external device 7, respectively, which are installed in the power supply path of the power supply system 1. Specifically, the output power calculation unit 11a calculates the power consumed by the display device 5 (for example, 35W) as the first output power output to the display device 5 by multiplying the current value indicated in the first current information output from the measurement unit 8 (the current value of the current flowing to the display device 5) by the voltage supplied to the display device 5. Furthermore, the output power calculation unit 11a calculates the power consumed by the external device 7 (for example, 45W) as the first output power output to the external device 7 by multiplying the current value indicated in the second current information output from the measurement unit 8 (the current value of the current flowing to the external device 7) by the voltage supplied to the external device 7.

[0035] The pre-conversion power calculation unit 11b calculates the first pre-conversion power based on the first correlation between the first pre-conversion power supplied from the first power supply source 2 to the first power conversion unit 3 and the first post-conversion power supplied after conversion by the first power conversion unit 3, and the first output power to the display device 5 and external equipment 7 calculated by the output power calculation unit 11a (corresponding to the first post-conversion power, which is the sum of the first output power to the display device 5 and external equipment 7).

[0036] The first correlation is a correlation that takes into account, for example, the power loss characteristics in the first power conversion unit 3 (including, for example, nonlinear or linear conversion efficiency characteristics such as AC / DC converters and DC / DC converters, and power loss characteristics due to a predetermined load such as a resistive circuit). The first correlation can be determined by experiments or other methods that measure in advance how the first pre-conversion power supplied from the first power supply source 2 to the first power conversion unit 3 changes in response to the change in the first post-conversion power after conversion by the first power conversion unit 3.

[0037] Figure 4 shows an example of the first correlation between the first pre-conversion power and the first post-conversion power. As shown in Figure 4, the first correlation between the first pre-conversion power and the first post-conversion power is expressed by a nonlinear quadratic equation L1. For example, if the first post-conversion power (the sum of the first output power to the display device 5 and the external device 7) is 80W, the first pre-conversion power can be calculated as 90W via the nonlinear quadratic equation L1. In this case, the ratio of the first pre-conversion power to the first post-conversion power is 1.125:1. Also, if the first post-conversion power is 46W, the first pre-conversion power can be calculated as 56.6W via the nonlinear quadratic equation L1. In this case, the ratio of the first pre-conversion power to the first post-conversion power is approximately 1.23:1. That is, when the first post-conversion power is 80W, the ratio of the first pre-conversion power to the first post-conversion power is smaller (not constant) compared to when the first post-conversion power is 46W. Correlation information showing the first correlation between the first power before conversion and the first power after conversion is stored in the storage unit 12 in the form of a table or an approximation formula.

[0038] As described above, the pre-conversion calculation unit 11b refers to the correlation information stored in the storage unit 12 and calculates the first pre-conversion power (e.g., 90W) based on the first converted power (e.g., 80W) obtained by summing the first output powers to the display device 5 and the external device 7, respectively, calculated by the output power calculation unit 11a.

[0039] The converted power calculation unit 11c calculates two first converted powers by converting the two first output powers (e.g., display device 5: 35W, external device 7: 45W) as the power corresponding to the first pre-conversion power (e.g., 90W) calculated by the output power calculation unit 11a (e.g., 35W:45W = 7:9) and the first pre-conversion power (e.g., 90W) calculated by the pre-conversion power calculation unit 11b.

[0040] If the first power before conversion is represented as P1 (e.g., 90W), the first output power to the display device 5 is represented as OP1 (e.g., 35W), and the first power after conversion is represented as P2 (e.g., 80W), then the first converted power P11 (e.g., 39.375W) of the display device 5 is calculated by the following formula (1).

[0041]

number

[0042] Furthermore, if the first power before conversion is represented by P1 (for example, 90W), the first output power to the external device 7 is represented by OP2 (for example, 45W), and the first power after conversion is represented by P2 (for example, 80W), then the first converted power P12 (for example, 50.625W) of the external device 7 is calculated by the following formula (2).

[0043]

number

[0044] The display control unit 11d outputs image data to the display device 5 showing the converted power of at least one of the display device 5 and the external device 7 calculated by the converted power calculation unit 11c, and controls the display device 5 to display the first converted power of at least one of the display device 5 and the external device 7 in an identifiable manner (for example, on-screen display). In addition to the first converted power of the display device 5 and the external device 7, the display control unit 11d may also display at least one of the powers obtained in the process of calculating the first converted power of the display device 5 and the external device 7, such as the first output power output to the display device 5, the first output power output to the external device 7, the first power before conversion, and the first power after conversion, on the display device 5.

[0045] Figure 5 shows an example of the display screen 20 displayed on the display device 5. As shown in Figure 5, the upper left portion of the display screen 20 shows a converted power image 30 using icons for the display device 5 and the external device 7, indicating that the first converted power of the display device 5 is 6W and the first converted power of the external device 7 is 54W. By referring to the converted power image 30, a user can accurately grasp the power consumption of the first load (display device 5 and external device 7), taking into account the effect of power loss by the first power conversion unit 3.

[0046] Furthermore, on the display screen 20, the converted power image 30 may be displayed in the upper right, lower left, or lower right portion instead of the upper left portion, or in a portion selected by the user from among multiple portions. In addition, from the viewpoint of preventing a decrease in the visibility of other display images due to the display of the converted power image 30 on the display screen 20, the transparency of the converted power image 30 displayed on the display screen 20 may be arbitrarily changed by the user.

[0047] The correlation setting unit 11e sets a first correlation that the pre-conversion power calculation unit 11b refers to, according to the supply voltage supplied from the first power supply source 2 to the first power conversion unit 3 (corresponding to the "supply state" in this invention). For example, the correlation setting unit 11e sets a correlation that the pre-conversion power calculation unit 11b refers to, such that the calculation accuracy of the first pre-conversion power corresponding to the first converted power is optimized when the supply voltage supplied from the first power supply source 2 to the first power conversion unit 3 is 100V. The correlation setting unit 11e also sets a correlation that the pre-conversion power calculation unit 11b refers to, such that the calculation accuracy of the first pre-conversion power corresponding to the first converted power is optimized when the supply voltage supplied from the first power supply source 2 to the first power conversion unit 3 is 200V. As a result, even if the supply voltage supplied from the first power source 2 to the first power conversion unit 3 is changed, the optimal first correlation relationship is set taking that change into consideration, thereby maintaining optimal accuracy in calculating the first pre-conversion power.

[0048] Furthermore, the correlation setting unit 11e may automatically set the first correlation that the pre-conversion power calculation unit 11b references, according to the supply voltage supplied from the first power supply source 2 to the first power conversion unit 3. Also, when a user gives a switching instruction, the correlation setting unit 11e may switch and set the first correlation according to the supply voltage supplied from the first power supply source 2 to the first power conversion unit 3. In addition, the correlation setting unit 11e may set the first correlation that the pre-conversion power calculation unit 11b references, according to whether power is supplied to the first power supply source 2 by, for example, USB PD power supply, AC input, DC input, or battery power supply (corresponding to the "supply state" of the present invention).

[0049] Figure 6 is a flowchart showing an example of the power calculation process performed by the power calculation device 10 in this embodiment (corresponding to the "power calculation method" of the present invention). The power calculation process performed by the power calculation device 10 is executed, for example, at predetermined intervals.

[0050] First, the output power calculation unit 11a calculates the first output power to be output to the display device 5 and the external device 7, respectively, which are installed in the power supply path of the power supply system 1 (step S100).

[0051] Next, the pre-conversion power calculation unit 11b calculates the first post-conversion power after conversion by the first power conversion unit 3 by summing the first output power to the display device 5 and external device 7 calculated by the output power calculation unit 11a in step S100 (step S110).

[0052] Next, the pre-conversion power calculation unit 11b calculates the first pre-conversion power (step S120) based on the first correlation between the first pre-conversion power supplied from the first power supply source 2 to the first power conversion unit 3 and the first post-conversion power after conversion by the first power conversion unit 3, and the first post-conversion power calculated in step S110 (the sum of the first output power to the display device 5 and the external device 7).

[0053] Next, the converted power calculation unit 11c calculates two first converted powers by converting the first output power to the display device 5 and the external device 7 as power corresponding to the first pre-conversion power, based on the power ratio between the first output power to the display device 5 and the external device 7 calculated by the output power calculation unit 11a and the first pre-conversion power calculated in step S120 (step S130).

[0054] Finally, the display control unit 11d outputs image data showing the first converted power of the display device 5 and the external device 7 calculated in step S130 to the display device 5, and controls the display device 5 to display the first converted power of the display device 5 and the external device 7 in an identifiable manner (step S140). Upon completion of the process in step S140, the power calculation device 10 terminates the power calculation process shown in Figure 6.

[0055] As explained in detail above, in this embodiment, the power calculation device 10 is provided in a power supply system 1 that converts the first pre-conversion power into the first post-conversion power using the first power conversion unit 3, and divides the first post-conversion power to output to a plurality of first loads (display device 5 and external equipment 7). The power calculation device 10 comprises an output power calculation unit 11a, a pre-conversion power calculation unit 11b, and a converted power calculation unit 11c. The output power calculation unit 11a calculates a plurality of first output powers to be output to a plurality of first loads. The pre-conversion power calculation unit 11b calculates the first pre-conversion power based on a first correlation between the first pre-conversion power and the first post-conversion power, and a plurality of first output powers (summed power) calculated by the output power calculation unit 11a. The converted power calculation unit 11c calculates multiple first converted powers by converting each of the multiple first output powers as power corresponding to the first pre-conversion power, based on the power ratio between the multiple first output powers and the first pre-conversion power calculated by the pre-conversion power calculation unit 11b.

[0056] According to this embodiment, which is configured in this way, the power corresponding to the first pre-conversion power is calculated by converting each of the multiple first output powers output to each of the multiple first loads (display device 5 and external device 7). In other words, the power consumed by the multiple first loads upstream of the first power conversion unit 3 in the power supply path of the power supply system 1 is calculated. Therefore, a user who refers to this first converted power can accurately grasp the power consumption of the first loads (display device 5 and external device 7) while taking into account the effect of power loss by the first power conversion unit 3.

[0057] In the above embodiment, an example was described in which the display device 5 and the external device 7 function as the "multiple first loads" of the present invention, but the present invention is not limited to this. For example, instead of two devices, three or more devices may function as the "multiple first loads" of the present invention, or one device and a group of devices including two or more devices may function as the "multiple first loads" of the present invention.

[0058] Furthermore, in the above embodiment, the output power calculation unit 11a may calculate the first output power output to the external device 7 by first calculating the first converted power after conversion by the first power conversion unit 3 and the first output power output to the display device 5, and then subtracting the first output power from the first converted power. Alternatively, the output power calculation unit 11a may calculate the first output power output to the display device 5 by first calculating the first converted power after conversion by the first power conversion unit 3 and the first output power output to the external device 7, and then subtracting the first output power from the first converted power. Referring to Figure 7, a power supply system 1 configured to calculate the first converted power supplied after conversion by the first power conversion unit 3 and the first output power output to the display device 5 will be described.

[0059] Figure 7 is a block diagram showing a modified configuration of the power supply system 1. As shown in Figure 7, the first resistor 4 is a current sensing resistor (shunt resistor) provided between the first power conversion unit 3 and the branching point 1a in the power supply path of the power supply system 1. The branching point 1a is the point where the power supply path 1b, which divides the first converted power converted by the first power conversion unit 3 and outputs it to the display device 5, and the power supply path 1c, which divides the first converted power converted by the power conversion unit 3 and outputs it to an external device 7, diverge. One end of the first resistor 4 is connected to the first power conversion unit 3, and the other end of the first resistor 4 is connected to the branching point 1a.

[0060] The second resistor 6 is a current sensing resistor (shunt resistor) installed between the branching point 1a and the display device 5 in the power supply path of the power supply system 1. One end of the second resistor 6 is connected to the branching point 1a, and the other end of the second resistor 6 is connected to the display device 5.

[0061] One end of the measuring unit 8 is connected to one end of the first resistor 4, and the other end of the measuring unit 8 is connected to the switch 9. The switch 9, under the control of the measuring unit 8, switches the connection destination of the other end of the measuring unit 8 between the other end of the first resistor 4 and the other end of the second resistor 6.

[0062] The measuring unit 8 measures the current flowing through the first resistor 4 or the current flowing through the second resistor 6 in a time-division manner. For example, when the measuring unit 8 controls the switch 9 and switches the connection destination of the other end of the measuring unit 8 to the other end of the first resistor 4 (as shown in Figure 7), it measures the current flowing through the first resistor 4 by measuring the voltage between the first resistor 4 (specifically, between one end and the other end of the measuring unit 8). The measuring unit 8 then outputs first current information, which indicates the current value of the current flowing through the first resistor 4, to the power calculation device 10.

[0063] Furthermore, the measuring unit 8 controls the switch 9 to switch the connection destination of the other end of the measuring unit 8 to the other end of the second resistor 6, and measures the voltage between the second resistor 6 (specifically, between one end and the other end of the measuring unit 8) to measure the current flowing through the second resistor 6 and, consequently, the current flowing through the display device 5. The measuring unit 8 then outputs second current information, which indicates the current value of the current flowing through the display device 5, to the power calculation device 10.

[0064] The output power calculation unit 11a (control unit 11) of the power calculation device 10 calculates the first converted power (for example, 40W) supplied after conversion by the first power conversion unit 3 by multiplying the current value (current value of the current flowing through the first resistor unit 4) indicated in the first current information output from the measurement unit 8 by the output voltage of the first power conversion unit 3. The output power calculation unit 11a also calculates the power consumed by the display device 5 (for example, 5W) as the first output power output to the display device 5 by multiplying the current value (current value of the current flowing through the display device 5) indicated in the second current information output from the measurement unit 8 by the voltage supplied to the display device 5. After calculating the first converted power (for example, 40W) supplied after conversion by the first power conversion unit 3 and the first output power output to the display device 5 (for example, 5W), the output power calculation unit 11a calculates the first output power (for example, 35W) output to the external device 7 by subtracting the first output power from the first converted power.

[0065] Furthermore, in the above embodiment, the first correlation between the first pre-conversion power supplied from the first power supply source 2 to the first power conversion unit 3 and the first post-conversion power supplied after conversion by the first power conversion unit 3 is not limited to the example shown in Figure 4. Figure 8 shows a modified example of the first correlation between the first pre-conversion power and the first post-conversion power. As shown in Figure 8, the first correlation between the first pre-conversion power and the first post-conversion power is expressed by a linear linear equation L2. For example, if the first post-conversion power is 50W, the first pre-conversion power can be calculated as 60W via the linear linear equation L2. For example, suppose the output power calculation unit 11a calculates the power consumed by the display device 5 (e.g., 5W) as the first output power output to the display device 5, and calculates the power consumed by the external device 7 (e.g., 45W) as the first output power output to the external device 7.

[0066] In this case, the pre-conversion power calculation unit 11b calculates the first pre-conversion power (for example, 60W) based on the first correlation (for example, the first correlation shown in Figure 8) between the first pre-conversion power supplied from the first power supply source 2 to the first power conversion unit 3 and the first converted power supplied after conversion by the first power conversion unit 3, and the first output power to the display device 5 and external device 7 calculated by the output power calculation unit 11a (corresponding to the first converted power, which is the sum of the first output power to the display device 5 and external device 7, for example, 50W).

[0067] The converted power calculation unit 11c calculates two first converted powers (e.g., display device 5: 6W, external device 7: 54W) by converting the two first output powers (e.g., display device 5: 5W, external device 7: 45W) respectively as power corresponding to the first pre-conversion power (e.g., 60W), based on the power ratio between the first output powers to the display device 5 and the external device 7 calculated by the output power calculation unit 11a (e.g., 5W: 45W = 1:9) and the first pre-conversion power calculated by the pre-conversion power calculation unit 11b (e.g., 60W).

[0068] Figure 9 shows a modified example of the first correlation between the first pre-conversion power and the first post-conversion power. As shown in Figure 9, the first correlation between the first pre-conversion power and the first post-conversion power is expressed by a linear linear equation L3. For example, if the first post-conversion power is 80W, the first pre-conversion power can be calculated as 100W via the linear linear equation L3.

[0069] Furthermore, in the above embodiment, an example was described in which the power calculation process performed by the power calculation device 10 is executed, for example, every predetermined time, but the present invention is not limited to this. For example, the power calculation process performed by the power calculation device 10 may be executed every time the operating state of the first load (for example, the display device 5) changes. For example, when the operating state of the display device 5 is in the normal operating state, the output power calculation unit 11a calculates the power consumed by the display device 5 (for example, 35W) as the first output power output to the display device 5, and calculates the power consumed by the external device 7 (for example, 45W) as the first output power output to the external device 7.

[0070] In this case, the pre-conversion power calculation unit 11b calculates the first pre-conversion power (for example, 90W) based on the first correlation (for example, the first correlation shown in Figure 4) between the first pre-conversion power supplied from the first power supply source 2 to the first power conversion unit 3 and the first converted power supplied after conversion by the first power conversion unit 3, and the first output power to the display device 5 and external device 7 calculated by the output power calculation unit 11a (corresponding to the first converted power, which is the sum of the first output power to the display device 5 and external device 7, for example, 80W).

[0071] The converted power calculation unit 11c calculates two first converted powers (for example, display device 5: 39.375W, external device 7: 50.625W) by converting the two first output powers (for example, display device 5: 35W, external device 7: 45W) respectively as power corresponding to the first pre-conversion power (for example, 90W), based on the power ratio between the first output powers to the display device 5 and the external device 7 calculated by the output power calculation unit 11a (for example, 35W:45W = 7:9) and the first pre-conversion power calculated by the pre-conversion power calculation unit 11b.

[0072] Furthermore, if the operating state of the display device 5 is in standby mode, the output power calculation unit 11a calculates the power consumed by the display device 5 (for example, 1W) as the first output power output to the display device 5, and calculates the power consumed by the external device 7 (for example, 45W) as the first output power output to the external device 7.

[0073] In this case, the pre-conversion power calculation unit 11b calculates the first pre-conversion power (for example, 56.6W) based on the first correlation (for example, the correlation shown in Figure 4) between the first pre-conversion power supplied from the first power supply source 2 to the first power conversion unit 3 and the first post-conversion power supplied after conversion by the first power conversion unit 3, and the first output power to the display device 5 and external device 7 calculated by the output power calculation unit 11a (corresponding to the first post-conversion power, which is the sum of the first output power to the display device 5 and external device 7, for example, 46W).

[0074] The converted power calculation unit 11c calculates two first converted powers (for example, display device 5: approximately 1.23W, external device 7: approximately 55.37W) by converting the two first output powers (for example, display device 5: 1W, external device 7: 45W) respectively into power corresponding to the first pre-conversion power (for example, 56.6W), based on the power ratio between the first output powers to the display device 5 and the external device 7 calculated by the output power calculation unit 11a (for example, 1W:45W = 1:45) and the first pre-conversion power calculated by the pre-conversion power calculation unit 11b (for example, 56.6W).

[0075] As described above, the first output power (e.g., 45W) output to the external device 7 remains constant regardless of the operating state of the display device 5 (normal operation state, standby state). However, if the first output power, and therefore the first converted power, output to the display device 5 changes from, for example, 80W to 46W in response to a change in the operating state of the display device 5, the first pre-conversion power also changes from, for example, 90W to 56.6W according to the first correlation. Therefore, even if the first output power output to the external device 7 remains constant (e.g., 45W), the first converted power (normal operation state: 50.625W, standby state: 55.37W), which is calculated by converting the first output power to the external device 7 as the power corresponding to the first pre-conversion power, changes, as does the degree of influence of the power consumption of the external device 7 on the first pre-conversion power. Furthermore, the first power before conversion is lower in the standby state (e.g., 56.6W) than in the normal operating state (e.g., 90W), but the first converted power, which is calculated by converting the first output power to the external device 7, is higher in the standby state (e.g., 55.37W) than in the normal operating state (e.g., 50.625W). In this way, it is possible to accurately grasp the change in power consumption of the external device 7, taking into account the effect of power loss by the first power conversion unit 3.

[0076] Furthermore, in the above embodiment, the power supply system 1 may include loads configured to perform power conversion internally. Figure 10 is a block diagram showing a modified configuration of the power supply system 1. As shown in Figure 10, the power supply system 1 includes a first power supply source 2 and a first power conversion unit 3, and includes two loads (corresponding to the "first load" of the present invention) a display device 5 and a load 40. The load 40 includes a second power supply source 2A and a second power conversion unit 3A, and includes two loads (corresponding to the "second load" of the present invention) a first external device 7A and a second external device 7B.

[0077] The first power conversion unit 3 is, for example, an AC / DC converter, which converts the AC power (first pre-conversion power) supplied from the first power supply source 2 to generate DC power (first post-conversion power), and divides the generated DC power to supply to the display device 5 and the load 40. The second power supply source 2A of the load 40 supplies the DC power (second pre-conversion power) supplied from the first power conversion unit 3 to the second power conversion unit 3A. The second power conversion unit 3A is, for example, a DC / DC converter, which converts the DC power (second pre-conversion power) supplied from the second power supply source 2A to second post-conversion power, and divides the second post-conversion power to output to the first external device 7A and the second external device 7B as DC power (second output power) suitable for the first external device 7A and the second external device 7B.

[0078] The control unit 11 of the power calculation device 10 calculates the power consumed by the display device 5 as the first output power supplied from the first power conversion unit 3A and output to the display device 5, in the same manner as the power calculation method described in the above embodiment. The control unit 11 also calculates the second output power supplied from the first power conversion unit 3A to the second power supply source 2A and output to the first external device 7A and the second external device 7B, respectively, via conversion by the second power conversion unit 3A.

[0079] The control unit 11 calculates the second pre-conversion power supplied from the second power source 2A to the second power conversion unit 3A at load 40, based on the second correlation between the second pre-conversion power supplied from the second power source 2A to the second power conversion unit 3A and the second post-conversion power supplied after conversion by the second power conversion unit 3A, and the calculated sum of the second output powers to the first external device 7A and the second external device 7B (corresponding to the second post-conversion power).

[0080] The control unit 11 calculates the first pre-conversion power supplied from the first power supply 2 based on the first correlation between the first pre-conversion power supplied from the first power supply 2 and the first post-conversion power supplied after conversion by the first power conversion unit 3, and the sum of the first output power to the display device 5 and the first output power to the load 40 (corresponding to the first post-conversion power calculated for the second pre-conversion power).

[0081] The control unit 11 calculates two first converted powers by converting the first output power to the display device 5 and the load 40 as the power corresponding to the first pre-conversion power, based on the power ratio between the first output power to the display device 5 and the load 40 and the calculated first pre-conversion power. Then, the control unit 11 calculates two second converted powers by converting the second output power to the first external device 7A and the second external device 7B as the power corresponding to the first converted power, based on the power ratio between the second output power to the first external device 7A and the second external device 7B and the first converted power calculated in relation to the load 40. In this way, by using the first converted power calculated in accordance with the load 40 to determine the second converted power of the first external device 7A and the second external device 7B, the power consumed by the two loads (first external device 7A and second external device 7B) upstream of the first power conversion unit 3, which is located upstream of the second power conversion unit 3A in the power supply path of the power supply system 1, is calculated, that is, the influence of the power consumption of the first external device 7A and the second external device 7B on the first pre-conversion power. The control unit 11 may also display image data showing at least one of the calculated first converted power and second converted power in an identifiable manner. Furthermore, the control unit 11 may set a first correlation and a second correlation according to the supply voltage supplied to the first power conversion unit 3 and the supply voltage supplied to the second power conversion unit 3A.

[0082] As described above, three converted powers (first converted power, second converted power) are calculated by converting the three output powers (first output power, second output power) output to the three loads (display device 5, first external device 7A, and second external device 7B), respectively, as the power corresponding to the first pre-conversion power. In other words, the power consumed by the three loads upstream of the first power conversion unit 3 in the power supply path of the power supply system 1 (the influence of the power consumption of the three loads on the first pre-conversion power) is calculated. Therefore, a user who refers to these converted powers can accurately grasp the power consumption of the loads (display device 5, first external device 7A, and second external device 7B) while taking into account the effects of power loss by the first power conversion unit 3 and the second power conversion unit 3A.

[0083] The scope of application of the technical idea of ​​this application is not limited to the embodiments described above. For example, the power supply system 1 in Figure 1 of the above embodiment may be an image display device 50 as shown in Figure 11. The image display device 50 consists of a first power supply source 2, a first power conversion unit 3, a first resistor unit 4, a display control unit 11d, a second resistor unit 6, an external device 7, a measurement unit 8, and a power calculation unit 60. The first power supply source 2, the first power conversion unit 3, the first resistor unit 4, the second resistor unit 6, the external device 7, and the measurement unit 8 are the same as in the above embodiment and therefore their description is omitted.

[0084] The power calculation unit 60 calculates the internal power consumption within the image display device and the external power supplied to the outside of the image display device. For example, if the power calculation unit 60 is composed of the output power calculation unit 11a, the pre-conversion power calculation unit 11b, and the converted power calculation unit 11c in the above embodiment, the calculated power consumption may be calculated as two first converted powers obtained by converting the first output power to the display control unit 11d and the external device 7, respectively, and then used as the internal power consumption within the image display device and the external power supplied to the image display device. As another example, if the power calculation unit 60 is composed of the output power calculation unit 11a in the above embodiment, the calculated power consumption may be calculated as the first output power to the display control unit 11d and the external device 7, and then used as the internal power consumption within the image display device and the external power supplied to the image display device. Furthermore, the power calculation unit 60 may be composed of at least one of a processor and a circuit, similar to the control unit 11 in the above embodiment.

[0085] The display control unit 11d simultaneously or in a switching manner displays the internal power consumption and external power supply of the image display device 50, which are calculated by the power calculation unit 60. The display control unit 11d may be composed of at least one of a processor and a circuit, similar to the control unit 11 in the actual embodiment described above.

[0086] Internal power consumption and external power supply are supplied from a common power source or multiple interacting power sources. In this example, internal power consumption and external power supply are supplied from a common first power source 2.

[0087] The display control unit 11d displays the internal power consumption and the external power supply simultaneously or by switching between them, allowing the user to easily understand the interconnected internal power consumption and the external power supply. If the display control unit 11d were to display only the internal power consumption, the value of the internal power consumption may fluctuate due to changes in the external power supply, etc., even though the state of the image display device itself has not changed, making it difficult for the user to understand the cause.

[0088] Although various embodiments of the present invention have been described above, these are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0089] 1: Power supply system, 1a: Branch point, 1b, 1c: Power supply path, 2: First power supply source, 2A: Second power supply source, 3: First power conversion unit, 3A: Second power conversion unit, 4: First resistor unit, 5: Display device, 6: Second resistor unit, 7: External device, 7A: First external device, 7B: Second external device, 8: Measurement unit, 9: Switch, 10: Power calculation device, 11: Control unit, 11a: Output power calculation unit, 11b: Pre-conversion power calculation unit, 11c: Converted power calculation unit, 11d: Display control unit, 11e: Correlation setting unit, 12: Memory unit, 13: Communication unit, 14: Operation input unit, 15: System bus, 20: Display screen, 30: Converted power image, 40: Load, 50: Image display device, 60: Power calculation unit

Claims

1. An image display device comprising a power calculation unit and a display control unit, The power calculation unit calculates the internal power consumption within the image display device and the external power supplied to the outside of the image display device. The display control unit simultaneously or in a switching manner displays the internal power consumption and the external power supply calculated by the power calculation unit. The aforementioned internal power consumption and the aforementioned external power supply are supplied from a common power source or from multiple interacting power sources. Image display device.

2. A power display method using an image display device, comprising a power calculation step and a display control step. In the power calculation step, the internal power consumption within the image display device and the external power supplied to the outside of the image display device are calculated. In the display control step, the internal power consumption and the external power supply calculated in the power calculation step are displayed simultaneously or by switching between them. The aforementioned internal power consumption and the aforementioned external power supply are supplied from a common power source or from multiple interacting power sources. Power display method.

3. A power display program that causes a processor to execute the power display method described in claim 2.

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