Power supply unit and display device

Abstract

To effectively function a release of a power saving mode in accordance with a surrounding situation.SOLUTION: A power source device comprises: a power source unit that supplies power to an information processing device; an acquisition unit that acquires a detection result of a person by a detection unit provided in the information processing device; a first determination unit that determines whether to satisfy a first condition being a condition related to an operation receivable by the information processing device to thereby output a first determination result; a second determination unit that determines whether to satisfy a second condition being a condition related to a situation around the information processing device to thereby output a second determination result; and a control unit that, when the detection result detects a person in a state where a power saving mode reducing the power to be supplied in comparison with a normal mode supplying the power to the information processing device is set, releases the power saving mode on the basis of the first determination result and second determination result.SELECTED DRAWING: Figure 3

Description

Technical Field

[0002]

[0001] The present invention relates to a power supply device and a display device.

Background Art

[0002] Conventionally, in a device that supplies power, a technique has been proposed for varying the power supply method according to the situation. For example, a configuration is known in which the device has a normal mode and a power saving mode that consumes less power than the normal mode.

[0003] Therefore, a technique for switching the mode based on the detection result of a human using a human sensor is known. In such a technique for switching the mode based on the detection result of a human, when the power saving mode is set for the display device, in order to suppress the power saving mode from being immediately canceled according to the detection result of a human, a technique has been proposed for invalidating the switching based on the detection result of the human sensor for a certain period. For example, in the technique described in Patent Document 1, when the human sensor detects a human, the mode switching is invalidated for a certain period based on the timing when the human is detected.

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the technique described in Patent Document 1, after the power saving mode is set, when a person is present in the vicinity, the human sensor continues to detect the person, so it is difficult to cancel the invalid state of the mode switching. Therefore, when switching the mode, the user had to perform a mode switching operation.

[0005] The present invention has been made in view of the above points, and an object thereof is to provide a power supply device and a display device that effectively function to cancel the power saving mode according to the surrounding situation.

Means for Solving the Problems

[0006] Therefore, in order to solve the above problem, the power supply unit comprises a power supply unit that supplies power to the information processing device and a detection unit provided in the information processing device that detects human Movement An acquisition unit that acquires detection results, Compared to normal mode Information processing device If the system switches to a power-saving mode that reduces the power supplied to it, and the time elapsed since the acquisition of human movement detection results by the acquisition unit was suppressed has exceeded 1 hour, The first condition is met. and judgement do First determination unit, If the number of times a person's movement is detected based on the motion detection results per second hour is greater than one or more predetermined thresholds, The second condition is met. and judgement do The second judgment unit, Ministry When a power mode is set, After the first condition is met and the acquisition of human detection results by the acquisition unit begins, the second condition is met. In that case 、 It includes a control unit that disables the power saving mode. [Effects of the Invention]

[0007] By disabling the power-saving mode in appropriate situations, we can provide a power supply and display device that offer improved convenience. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a diagram illustrating the external appearance of a display device according to an embodiment. [Figure 2] Figure 2 shows an example of the hardware configuration of a display device according to an embodiment. [Figure 3] Figure 3 is a diagram showing an example of a functional block that explains the functions of the display device according to the embodiment, divided into blocks. [Figure 4] Figure 4 illustrates the state changes of each component of the display device when the power saving mode is set according to the embodiment. [Figure 5] Figure 5 illustrates the state changes of each component of the display device when the power saving mode is set, according to the embodiment. [Figure 6] Figure 6 illustrates the state changes of each component of the display device when the power saving mode is set, according to the embodiment. [Figure 7] Figure 7 is a flowchart showing the overall processing of the display device according to the embodiment. [Modes for carrying out the invention]

[0009] The optimal and minimum mode for carrying out the invention will be described below with reference to the drawings. In the drawings, the same reference numerals indicate the same components, and redundant explanations will be omitted. Furthermore, the specific examples shown are illustrative, and may include other components not shown.

[0010] The following describes an embodiment of a display device having a power supply. The display device according to this embodiment may, for example, be an electronic whiteboard that allows the user to input characters or drawings using an electronic pen or the like.

[0011] Figure 1 is an example diagram illustrating the external appearance of the display device according to this embodiment. The display device shown in Figure 1 is used as an example, and multiple display devices may be used in combination.

[0012] Furthermore, the display device 2 may be connected to a communication network (not shown) for communication. The display device 2 according to this embodiment has a touch sensor-equipped display 3 (an example of a display unit).

[0013] In other words, since the display device 2 has a touch sensor display 3, it can process stroke images drawn by events input to the touch sensor display 3 by the electronic pen 4 (for example, operations such as touching the touch sensor display 3 with the tip or the end of the electronic pen 4), and display the stroke images on the touch sensor display 3. Images representing characters, figures, numbers, symbols, lines, or combinations thereof that a user writes by hand on the display device 2 (for example, an electronic whiteboard) may also be referred to as stroke images.

[0014] Note that not only the electronic pen 4, but also based on events caused by the user's hand H, etc. (for example, gestures such as zooming in, zooming out, or page turning).), the display device 2 changes the image displayed on the display 3.

[0015] In addition, a USB memory 5 can be connected to the display device 2. And the display device 2 can read an electronic file such as PDF (Portable Document Format) from the USB memory 5, or store an electronic file in the USB memory 5, etc.

[0016] The display device 2 has connectors conforming to standards such as DisplayPort, DVI (Digital Visual Interface), HDMI (registered trademark) (High-Definition Multimedia Interface), and VGA (Video Graphics Array). Therefore, a notebook PC, etc. (not shown) can be connected to the display device 2 via a cable.

[0017] Furthermore, the display device 2 has a power switch 7 and a human presence sensor 6.

[0018] The power switch 7 is a switch for switching the ON / OFF of the power supply. The display device 2 can switch between power-on and power-off according to the input from the user to the power switch 7. When the power is turned on, the display device 2 starts an application program. Thereafter, the display device 2 can perform processing corresponding to the operation input from the user.

[0019] The human presence sensor 6 is a sensor for detecting the presence or absence of a person. For example, the human presence sensor 6 detects a person using infrared rays. That is, infrared rays are emitted by the temperature of a person or an animal, etc. Therefore, the human presence sensor 6 senses the infrared rays emitted by a person, etc. and detects a person. The human presence sensor 6 according to this embodiment can detect a plurality of people existing around the display device 2.

[0020] Furthermore, the human presence sensor 6 is not limited to an infrared-based system. For example, the human presence sensor 6 may detect whether or not a person is present in an image captured by a camera or the like using facial recognition. Alternatively, the human presence sensor 6 may detect a person using sound, temperature, vibration, detection results from an external device, or a combination of these.

[0021] Furthermore, the following explanation describes an example in which an electronic whiteboard is used as the display device 2. However, the display device with a power supply may be something other than an electronic whiteboard. For example, the display device may be an electronic sign (digital signage), a telestrater used in sports, weather forecasts, etc., or a remote image (video) diagnostic device.

[0022] The following explanation describes an example where the recording medium that can be connected to the display device 2 is a USB memory stick 5. However, the recording medium is not limited to this. For example, the recording medium may be other types of recording media such as an SD® card.

[0023] <Example of display device hardware configuration> The following describes an example of the hardware configuration of the display device according to this embodiment.

[0024] Figure 2 shows an example of the hardware configuration of the display device 2 according to this embodiment. As shown in Figure 2, the display device 2 includes a CPU (Central Processing Unit) 201, a ROM (Read Only Memory) 202, a RAM (Random Access Memory) 203, and an SSD (Solid State Drive) 204.

[0025] CPU201 performs calculations according to the input instructions. ROM202 stores programs used to drive CPU201, such as the IPL (Initial Program Loader). RAM203 is used as the work area for CPU201.

[0026] In this embodiment, the control unit 250 is realized by combining the CPU 201, ROM 202, and RAM 203. The control unit 250 controls the entire display device 2.

[0027] In this embodiment, the hardware configuration of the control unit 250 is not limited to that described above, and some or all of the functions of the control unit 250 may be realized by one or more processing circuits. Here, processing circuits include electronic circuits such as the CPU, ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), and conventional circuit modules.

[0028] SSD204 stores various data such as the OS and programs for display device 2, but this data may also be stored in ROM202. This program may also be an application program that runs on an information processing device equipped with a general-purpose OS (such as Windows®, Mac OS®, Android®, iOS®, etc.). In other words, display device 2 may also be an information processing device.

[0029] The display device 2 has a network interface (I / F) 205 for controlling communication using a communication network (not shown), and an external device connection interface (I / F) 206 for controlling communication with external devices such as an externally connected USB memory 5.

[0030] The display device 2 also includes a human presence sensor 6, a power switch 7, a display controller 213, a touch sensor 214, a touch sensor controller 215, a microphone 216, a speaker 217, a wireless communication circuit 219, a power control circuit 224, an AC adapter 225, and a battery 226. The human presence sensor 6 and the power switch 7 have the configuration described above.

[0031] The display controller 213 controls and manages the screen display in order to output the output image to the display 3.

[0032] The touch sensor 214 detects when an electronic pen 4 or the user's hand H (the pen and the user's hand are examples of input methods) comes into contact with the display 3.

[0033] The touch sensor controller 215 controls the processing of the touch sensor 214. Specifically, the touch sensor 214 performs coordinate input and coordinate detection using an infrared blocking method. In this method of coordinate input and detection, two light-emitting and receiving devices installed at both ends of the upper side of the display 3 first emit multiple infrared rays parallel to the display 3. The emitted infrared rays are then reflected by reflective materials provided around the display 3. Subsequently, a light-receiving element receives the light that returns along the same optical path as the emitted light.

[0034] The touch sensor 214 outputs the infrared ID emitted by the two light-emitting / receiving devices, which are blocked by the object, to the touch sensor controller 215, which then identifies the coordinate position of the object's contact point. In this embodiment, the method for identifying the coordinate position of the object's contact point is not limited to the example using two light-emitting / receiving devices; for example, the coordinate position may be identified using a touch panel.

[0035] Furthermore, the touch sensor controller 215 has a communication unit 215a. The communication unit 215a can communicate wirelessly with the electronic pen 4. For example, the communication unit 215a can receive a pen ID that identifies the electronic pen 4. For example, if the communication unit 215a communicates using a standard such as Bluetooth (registered trademark), a commercially available pen can be used as the electronic pen 4. One or more electronic pens 4 may be registered in advance with the communication unit 215a. When an electronic pen 4 is registered, the electronic pen 4 can communicate with the display device 2 without the user having to perform any connection settings.

[0036] The touch sensor 214 is not limited to an infrared blocking type. For example, the touch sensor 214 may be a capacitive touch panel that identifies the contact position by detecting a change in capacitance. Furthermore, the touch sensor 214 may be a resistive touch panel that identifies the contact position by voltage changes between two opposing resistive films. Another example is an electromagnetic induction touch panel that identifies the contact position by detecting electromagnetic induction caused by contact between an object and the display unit.

[0037] The touch sensor 214 does not require an electronic pen to detect whether or not the pen tip is touching the surface. In this case, a fingertip or a pen-shaped stick can be used for touch operation. The electronic pen 4 does not have to be a long, slender pen shape.

[0038] Microphone 216 is used for audio input. Speaker 217 is used for audio output.

[0039] The wireless communication circuit 219 communicates with the user's portable device and relays connections to the internet, for example. The wireless communication circuit 219 communicates using Wi-Fi or Bluetooth®, but the communication standard is not limited. The wireless communication circuit 219 forms an access point, and when the user sets the SSID (Service Set Identifier) ​​and password obtained by the user on the user's portable device, the user can connect to the access point.

[0040] The wireless communication circuit 219 may have two or more access points. For example, the following two access points are possible.

[0041] a. First access point → Internet b. Second access point → Internal network → Internet

[0042] The first access point, indicated by a, is for external users. When using this access point, users cannot access the internal network, but they can use the internet. On the other hand, the second access point, indicated by b, is for internal users. When using this access point, users can access both the internal network and the internet.

[0043] The power control circuit 224 controls the AC adapter 225 and battery 226, which are the power sources for the display device 2. The AC adapter 225 converts the alternating current supplied by the commercial power supply to direct current. In this embodiment, the power supply unit functions through a combination of one or more of the AC adapter 225 and the battery 226 and the power control circuit 224. For example, the power control circuit 224 supplies power from the AC adapter 225 or the battery 226 to the entire display device 2.

[0044] In this embodiment, an example of supplying power to the display device 2 is described, but the power supply destination is not limited to the display device 2; any information processing device capable of consuming power is acceptable.

[0045] For example, if the display 3 is so-called electronic paper, it consumes little to no power to maintain the image after it has been drawn, so it can be powered by a battery 226. This makes it possible to use the display device 2 for applications such as digital signage even in places where it is difficult to connect to a power source, such as outdoors.

[0046] Furthermore, the display device 2 is equipped with a bus line 210. The bus line 210 is an address bus, data bus, etc., for electrically connecting each component, such as the CPU 201 shown in Figure 3.

[0047] <Example of Functional Configuration> Next, the functions of the display device 2 will be explained using Figure 3. Figure 3 is a diagram showing an example of a functional block that explains the functions of the display device 2 according to this embodiment in a block-like manner. The display device 2 functions as an information processing device that performs information processing. Furthermore, the display device 2 has the function of a power supply device that controls the power consumption supplied by a power supply unit realized by a combination of one or more of the AC adapter 225 and the battery 226 and the power control circuit 224.

[0048] The control unit 250 of the display device 2 includes, for example, an acquisition unit 301, a first determination unit 302, a second determination unit 303, and a mode control unit 304, as functional units realized by executing one or more programs installed on the SSD 204 on the CPU 201.

[0049] The mode control unit 304 controls the modes associated with the display device 2. For example, the mode control unit 304 switches the mode in which the display device 2 operates. In this embodiment, the mode control unit 304 can switch modes by transmitting a signal to the power control circuit 224. The mode control unit 304 also controls the display device 2 according to the currently set mode.

[0050] The display device 2 according to this embodiment has two switchable modes: a normal mode and a power-saving mode.

[0051] The normal mode is the mode used when the display device 2 is operating normally.

[0052] The power-saving mode is a mode that reduces the power supplied to the display device 2 compared to the normal mode. As a method of reducing power, the power-saving mode according to this embodiment is a mode that turns off the display of the display 3. However, the power-saving mode is not limited to control that turns off the display of the display 3, but only needs to reduce power. For example, in power-saving mode, only the backlight of the display 3 may be turned off. Note that the switching between normal mode and power-saving mode is not determined solely by whether the display 3 is usable or not. In other words, the power-saving mode only needs to be a state in which power consumption is low. Therefore, any device is acceptable as long as it has a power control configuration that cuts off power or reduces the power supply in power-saving mode.

[0053] The mode control unit 304 controls the transition from normal mode to power-saving mode according to operations received, for example, from the touch sensor 214 or various buttons (not shown). Operations received by the touch sensor 214 include, for example, pressing an icon displayed on the display 3 that indicates a transition to power-saving mode. Operations on the various buttons include, for example, pressing a button that turns off the display 3.

[0054] The acquisition unit 301 acquires signals from various sensors provided on the display device 2. For example, the acquisition unit 301 acquires a signal indicating the detection result of a person by a human presence sensor (an example of a detection unit) 6 provided on the display device 2.

[0055] The first determination unit 302 determines whether a first condition, which is a condition related to an operation that the display device 2 (an example of an information processing device) can accept, is met, and outputs the first determination result to the mode control unit 304. In this embodiment, the first determination unit 302 determines that the first condition is met when the time elapsed since the display device 2 transitioned to power-saving mode and started counting due to an operation from the user has exceeded the invalid period T1 (an example of the first time). In this embodiment, an example is described in which the elapsed time since the operation to transition to power-saving mode was received is used as the first condition, but the first condition is not limited to such a condition. For example, the first condition may be any condition related to an operation from the user.

[0056] Furthermore, the first determination unit 302 according to this embodiment also determines whether the time elapsed since the start of the count has exceeded the invalidation period T3 (an example of the third time). The conditions for starting the count will be described later.

[0057] The invalidation periods T1 (an example of the first hour) and T3 are the periods during which the motion sensor 6 does not detect a person. The invalidation periods T1 and T3 are, for example, pre-set periods and are stored, for example, in the SSD 204. It is desirable that the invalidation periods T1 and T3 be set to the time required for a user who has performed the operation to switch to power-saving mode to move out of the detection range of the motion sensor 6. On the other hand, it is desirable that the invalidation periods T1 and T3 are not too long.

[0058] If the invalidation period is set to a short time of less than 10 seconds, there is a high chance that the user who initiated the power-saving mode will still be nearby. Setting the invalidation period T1 and T3 to 10 seconds or longer prevents the user who initiated the power-saving mode from being detected again after the operation. On the other hand, if the invalidation period T1 and T3 is too long, the next user may not be able to use the device immediately. Therefore, it is desirable to set the invalidation period T1 and T3 to less than 60 seconds.

[0059] Therefore, it is desirable to set the invalidation periods T1 and T3 to approximately 10 to 60 seconds. Such invalidation periods T1 and T3 prevent false detection of a user who has initiated the operation to switch to power-saving mode, and also prevent the next user from being prevented from using the device immediately.

[0060] However, the optimal values ​​for the inactivity periods T1 and T3 vary depending on the range in which the motion sensor 6 detects people, as well as the location where the display device 2 is installed and the size of the room. Therefore, it is desirable to set the inactivity periods T1 and T3 considering the settings of the motion sensor 6 and the environment. Note that the settings of approximately 10 to 60 seconds exemplified above are for a typical conference room.

[0061] The second determination unit 303 determines whether a second condition, which is a condition related to the surrounding environment of the display device 2 (an example of an information processing device), is met, and outputs the second determination result to the mode control unit 304. In this embodiment, the second determination unit 303 determines that the second condition is met if the number of times human movement is detected by the human presence sensor 6 per unit time (an example of a second time) is greater than a predetermined threshold. In this embodiment, an example is described in which the second condition is whether the number of times human movement is detected by the human presence sensor 6 per unit time (an example of a second time) is greater than a predetermined threshold, but the second condition is not limited to such a condition. As the second condition, for example, the detection result of a sensor provided on the display device 2 that detects the surrounding environment of the display device 2 may be used as a condition. The unit time (an example of a second time) is a time set out to detect human movement, and is determined according to the embodiment, such as the performance of the human presence sensor 6.

[0062] The number of times human movement is detected by the motion sensor 6 may correspond, for example, to the number of people present around the display device 2 (an example of an information processing device). In other words, the second condition is met when the number of times human movement is detected is greater than a predetermined threshold, for example, when the number of people detected by the motion sensor 6 is greater than a predetermined threshold.

[0063] After switching to power-saving mode, the mode control unit 304, upon detecting a person based on the detection result of the human presence sensor 6, decides whether or not to deactivate power-saving mode based on the first determination result input from the first determination unit 302 and the second determination result input from the second determination unit 303.

[0064] In this embodiment, the mode control unit 304 recognizes that the first condition has been met based on the input first determination result, and also recognizes that the second condition has been met based on the input second determination result, and then cancels the power saving mode.

[0065] In other words, the mode control unit 304 deactivates the power saving mode when the elapsed time since switching to power saving mode has exceeded the invalidation period T1 (an example of the first hour) and the number of people detected by the motion sensor 6 is greater than a predetermined threshold (for example, 2 people). In this embodiment, detection by the motion sensor 6 begins after the elapsed time since switching to power saving mode has exceeded the invalidation period T1 (an example of the first hour) (after it has been determined that the first condition has been met). Then, the mode control unit 304 deactivates the power saving mode when the number of people detected by the motion sensor 6 (amount of motion detected) is greater than a predetermined threshold (for example, 2 people).

[0066] Next, we will describe a first example of control performed when the power saving mode is set in the display device 2. Figure 4 is a diagram illustrating the state changes of each component of the display device 2 when the power saving mode is set. The example shown in Figure 4 shows the case when the human presence sensor 6 of the display device 2 does not detect a person.

[0067] As shown in Figure 4, when the power saving mode is set, the display 3 enters a display suppression state (for example, a display off state), and the human presence sensor 6 enters an inactive state where it does not perform detection during the inactive period T1.

[0068] After the invalidation period T1 has elapsed, the motion sensor 6 enters a conditionally enabled state during the conditionally enabled period T2. What happens when a person is detected while in the conditionally enabled state will be described later.

[0069] Then, if the motion sensor 6 does not detect a person during the conditional validity period T2, the motion sensor 6 becomes active. After the motion sensor 6 becomes active, if the motion sensor 6 detects a person, the mode control unit 304 deactivates the power saving mode of the display device 2. The conditional validity period T2 is determined according to the embodiment.

[0070] Next, a second example of control performed when the power saving mode is set in the display device 2 will be described. Figure 5 is a diagram illustrating the state changes of each component of the display device 2 when the power saving mode is set. In the example shown in Figure 5, the human presence sensor 6 of the display device 2 detects a person at time t11.

[0071] First, as in Figure 4, when the power saving mode is turned on, the display 3 enters a display suppression state (for example, a display off state), and the human presence sensor 6 enters an inactive state where it does not perform detection during the inactive period T1.

[0072] After the invalidation period T1 has elapsed, the motion sensor 6 enters a conditionally enabled state. The motion sensor 6 detects a person at time t11 while in the conditionally enabled state.

[0073] In the example shown in Figure 5, the second determination unit 303 determines at time t11 that the number of detections (number of people) by the motion sensor 6 is greater than a predetermined threshold. In this case, the mode control unit 304 performs control to cancel the power saving mode based on the determination result. As a result, the display 3 transitions to the normal display state (for example, the display on state). After the power saving mode is canceled, the motion sensor 6 enters an inactive state where it does not perform detection.

[0074] In the example shown in Figure 5, the motion sensor 6 enters a conditionally enabled state when the number of detections by the motion sensor 6, in other words, the number of people detected, exceeds a predetermined threshold. In such cases, the power-saving mode of the display device 2 is deactivated. In other words, since there are many people around the display device 2, it is determined that work using the display device 2 will be performed, and the power-saving mode is deactivated.

[0075] Next, a third example of control performed when the power saving mode is set in the display device 2 will be described. Figure 6 is a diagram illustrating the state changes of each component of the display device 2 when the power saving mode is set. In the example shown in Figure 6, the human presence sensor 6 of the display device 2 detects a person at time t21.

[0076] First, as in Figure 4, when the power saving mode is turned on, the display 3 enters a display suppression state (for example, a display off state), and the human presence sensor 6 enters an inactive state where it does not perform detection during the inactive period T1.

[0077] After the invalidation period T1 has elapsed, the motion sensor 6 enters a conditionally enabled state. The motion sensor 6 detects a person at time t21 while in the conditionally enabled state.

[0078] In the example shown in Figure 6, the second determination unit 303 determines that the number of detections by the motion sensor 6 is below a predetermined threshold. In this case, the mode control unit 304 performs control to maintain the power-saving mode based on the determination result. As a result, the display 3 maintains a display suppression state (for example, a display-off state). The motion sensor 6 also enters an inactive state that suppresses detection during an inactive period T3 (an example of a third period). The inactive period T3 may be the same length as the inactive period T1, or it may be a different length.

[0079] After the invalidation period T3 has elapsed, the motion sensor 6 becomes active. When active, if the motion sensor 6 detects a person, the power saving mode is deactivated regardless of the number of people detected.

[0080] In the example shown in Figure 6, at time t22, the motion sensor 6 detects a person, so the mode control unit 304 performs control to deactivate the power saving mode. As a result, the display 3 transitions to the normal display state (for example, the display-on state). After the power saving mode is deactivated, the motion sensor 6 becomes inactive and does not perform detection.

[0081] In the example shown in Figure 6, the motion sensor 6 is conditionally enabled when, at time t21, the number of motions detected by the motion sensor 6, in other words, the number of people detected, is below a predetermined threshold. In such cases, the power-saving mode of the display device 2 is maintained, and the motion sensor 6 is disabled again. In other words, at time t21, there are few people around the display device 2, so it is determined that the conditions that led to the power-saving mode being set are continuing, and the power-saving mode is maintained.

[0082] <Overall processing flow> Next, the overall processing flow of the display device 2 according to this embodiment will be described.

[0083] Figure 7 is a flowchart showing the overall processing flow by the display device 2 according to this embodiment. In the example shown in Figure 7, the power to the display device 2 is already turned on.

[0084] First, the mode control unit 304 controls the display device 2 according to the normal mode (S701). That is, the normal mode is set while a person is using the display device 2 in a meeting or the like.

[0085] The mode control unit 304 then receives an operation from the touch sensor 214 or the like to switch to power-saving mode (S702). For example, to control the display 3 to turn off, it receives an operation to switch to power-saving mode via an interface such as a button or icon. The mode control unit 304 then proceeds to S703 triggered by the operation.

[0086] The mode control unit 304 initiates control to switch the display device 2 into power-saving mode (S703). In power-saving mode, the power supplied is reduced by, for example, turning off the display 3.

[0087] The mode control unit 304 starts counting the elapsed time (S704).

[0088] The mode control unit 304 checks whether the display device 2 has entered power-saving mode (for example, whether the display 3 has been turned off) (S705). If the display device 2 has not entered power-saving mode (S705: NO), the check continues.

[0089] On the other hand, if the mode control unit 304 confirms that the display device 2 has switched to power-saving mode (S705: YES), it switches the motion sensor 6 to a disabled state (S706).

[0090] Subsequently, the first determination unit 302 determines whether the elapsed time has exceeded the invalidation period T1 (S707). If it determines that the invalidation period T1 has not exceeded (S707: NO), the determination in S707 is performed again.

[0091] Subsequently, if the first determination unit 302 determines that the elapsed time has exceeded the invalid period T1 (S707: YES), it outputs the determination result to the mode control unit 304, and the mode control unit 304 switches the human presence sensor 6 to a conditionally enabled state (S708).

[0092] Furthermore, the mode control unit 304 initializes the elapsed time to '0' and then restarts the elapsed time count (S709).

[0093] The motion sensor 6 then determines whether or not it has detected a person (S710). If it determines that it has not detected a person (S710: NO), the first determination unit 302 determines whether or not the conditional validity period T2 has elapsed (S711). If it determines that the conditional validity period T2 has not elapsed (S711: NO), the detection in S710 is performed again.

[0094] On the other hand, if the first determination unit 302 determines that the elapsed time has exceeded the conditional validity period T2 (S711: YES), it outputs the determination result to the mode control unit 304. As a result, the mode control unit 304 switches the motion sensor 6 to the enabled state (S712).

[0095] The motion sensor 6 then determines whether or not it has detected a person (S713). If it determines that it has not detected a person (S713: NO), it repeats this determination until it detects a person.

[0096] On the other hand, if the motion sensor 6 determines that it has detected a person (S713: YES), the mode control unit 304 terminates the power saving mode and ends processing based on the signal from the motion sensor 6 indicating that a person has been detected (S715).

[0097] In S710, if the motion sensor 6 determines that it has detected a person (S710:YES), the second determination unit 303 determines whether the number of detections is greater than a predetermined threshold (S714).

[0098] If the second determination unit 303 determines that the number of detections exceeds a predetermined threshold (S714: YES), the mode control unit 304 cancels the power saving mode and terminates the process (S715).

[0099] On the other hand, if the second determination unit 303 determines that the number of detections is below a predetermined threshold (S714: NO), the mode control unit 304 switches the motion sensor 6 to a disabled state (S716). At that time, the elapsed time is initialized to '0'.

[0100] Subsequently, the first determination unit 302 determines whether the elapsed time has exceeded the invalidation period T3 (S717). If the first determination unit 302 determines that the elapsed time has not exceeded the invalidation period T3 (S717: NO), it repeats the determination until the elapsed time exceeds the invalidation period T3.

[0101] On the other hand, if the first determination unit 302 determines that the elapsed time has exceeded the invalid period T3 (S717: YES), it outputs the determination result to the mode control unit 304. As a result, the mode control unit 304 switches the motion sensor 6 to the enabled state (S712). The subsequent processes (S713, S715) are as described above, so their explanation is omitted.

[0102] <Variation> The embodiments described above are not limited to the first and second conditions. For example, as the first condition, the first determination unit 302 may determine whether the first condition is met based on whether or not it has received a predetermined gesture operation from the user.

[0103] For example, facial recognition may be used to determine the conditions. For instance, if the display device 2 is equipped with a sensor that performs facial recognition, it can recognize the user performing the operation to switch to power-saving mode. The second determination unit 303 may then determine that the second condition is met if it determines, as a result of facial recognition, that a user different from the user recognized at the time the operation was performed has been detected. In this case, the first condition may be the same as in the embodiment described above, or it may be a different condition.

[0104] The user who performs the operation to switch to power-saving mode is often the person who will end the use of the display device 2. Therefore, if a user other than the user who performed the operation is detected, it can be presumed that this different user will be the next user to use the display device 2. Thus, if the second determination unit 303 determines that it has detected this different user, it may determine that the second condition has been met.

[0105] Note that user recognition may also be done using other methods, such as IDs.

[0106] Furthermore, as a second condition, the system may detect a user approaching the display device 2. For example, the second determination unit 303 determines whether or not there is an approaching user based on the detection result input from a sensor that measures the distance to the user. In other words, it can be presumed that a user moving away is a user who has finished using the display device 2, and a user approaching is a user who is about to start using the display device 2. Therefore, the second determination unit 303 may determine that the second condition has been met if it determines, based on the detection result, that there is an approaching user.

[0107] In this modified version, the power-saving mode can be deactivated depending on the user's movement pattern, allowing approaching users to immediately use the display device 2, thus improving convenience.

[0108] Furthermore, the modes are not limited to just two: normal mode and power-saving mode. At a minimum, the power supply unit may have any other modes as long as power-saving mode can be set. Also, the names of the modes do not have to be "normal mode" and "power-saving mode". For example, power-saving mode can be any mode that consumes less power than normal mode, such as "standby mode".

[0109] Furthermore, in the embodiments described above, the transition to power-saving mode was explained in terms of an example based on an operation received from the user. However, the transition to power-saving mode is not limited to a method based on an operation received from the user. For example, the transition to power-saving mode may occur from the time the display device 2 is started up, or after a predetermined time has elapsed since the user stopped accepting operations, or after a predetermined time has elapsed by a timer.

[0110] Furthermore, all or part of the overall process may be implemented by a program that causes a computer to execute a power control method. In other words, the program is a computer program that causes the computer, such as a power supply unit or display device, to execute each process. Therefore, when the power control method is executed based on the program, the arithmetic unit and control unit of the computer perform calculations and controls based on the program in order to execute each process. In addition, the memory device of the computer stores the data used for each process based on the program in order to execute each process.

[0111] Furthermore, the program may be recorded on a computer-readable recording medium and distributed. The recording medium may be magnetic tape, flash memory, optical disc, magneto-optical disc, or magnetic disc. Additionally, the program may be distributed via telecommunications lines.

[0112] Although an example of an embodiment has been described above, the present invention is not limited to the above embodiment. That is, various modifications and improvements are possible within the scope of the present invention.

[0113] In the embodiments and modified examples described above, the display device 2 deactivates the power-saving mode when the first and second conditions are satisfied, thereby improving the convenience for the user when using the display device 2.

[0114] Although embodiments of the present invention have been described in detail above, the present invention is not limited to these specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention as described in the claims.

[0115] Examples of the present invention are as follows: <1> A power supply unit that supplies power to the information processing device, An acquisition unit that acquires the results of human detection by a detection unit provided in the aforementioned information processing device, A first determination unit that determines whether or not a first condition, which is a condition related to an operation that the information processing device can accept, is met, and outputs a first determination result, A second determination unit that determines whether or not a second condition, which is a condition related to the surrounding circumstances of the information processing device, is met and outputs a second determination result, In a state where a power-saving mode is set that reduces the power supplied to the information processing device compared to the normal mode, a control unit that, when a person is detected in the detection result, cancels the power-saving mode based on the first and second determination results, A power supply unit equipped with the following features. <2> The first determination unit determines that the first condition is met if the elapsed time since switching to the power-saving mode has exceeded the first hour. The aforementioned <1> The power supply unit described above. <3> The second determination unit determines that the second condition is met if the number of times the human movement detected by the detection unit per second time period is greater than a predetermined threshold. The aforementioned <1> or <2> The power supply unit described above. <4> The second determination unit determines that the second condition is not met if the number of times the detection unit detects the person's movement per second hour is less than or equal to the predetermined threshold, and suppresses the detection of the person's movement by the detection unit for the third hour. The aforementioned <1> ~ <3> A power supply device as described in any one of the following. <5> Display unit and A power supply unit that supplies power to the display unit, An acquisition unit that acquires the results of human detection by a detection unit provided on the display unit, A first determination unit that determines whether or not a first condition, which is a condition related to an operation that the device can accept, is met and outputs a first determination result, A second determination unit that determines whether or not a second condition, which is a condition related to the surrounding circumstances of the device, is met and outputs a second determination result, In a state where a power-saving mode is set that reduces the power supplied to the information processing device compared to the normal mode, a control unit that, when a person is detected in the detection result, cancels the power-saving mode based on the first and second determination results, A display device equipped with the following features. <6> The first determination unit determines that the first condition is met if the elapsed time since switching to the power-saving mode has exceeded the first hour. The aforementioned <5> The display device described above. <7> The second determination unit determines that the second condition is met if the number of times the human movement detected by the detection unit per second time period is greater than a predetermined threshold. The aforementioned <5> or <6> The display device described above. <8> The second determination unit determines that the second condition is not met if the number of times the detection unit detects the person's movement per second hour is less than or equal to the predetermined threshold, and suppresses the detection of the person's movement by the detection unit for the third hour. The aforementioned <5> ~ <7> A display device as described in any one of the following. [Explanation of symbols]

[0116] 2 Display device 3 displays 4. Electronic pen 5 USB flash drives 6-person motion sensor 7 Power switch 213 Display Controller 214 Touch Sensor 215 Touch Sensor Controller 224 Power Control Circuit 225 AC adapter 226 batteries 301 Acquisition Department 302 1st Judgment Department 303 Second Judgment Department 304 Mode Control Unit [Prior art documents] [Patent Documents]

[0117] [Patent Document 1] Japanese Patent Publication No. 2021-166040

Claims

1. A power supply unit that supplies power to the information processing device, An acquisition unit that acquires the results of detecting human movement by a detection unit provided in the aforementioned information processing device, A first determination unit determines that a first condition is met when the system switches to a power-saving mode that reduces the power supplied to the information processing device compared to the normal mode, and a first time has elapsed since the acquisition of the human movement detection result by the acquisition unit was suppressed. A second determination unit determines that the second condition is met if the number of times the person's movement is detected based on the results of detecting the person's movement per second hour is greater than one or more predetermined thresholds, When the power saving mode is set, and after the acquisition of the human movement detection result by the acquisition unit is started when the first condition is met, the control unit cancels the power saving mode when the second condition is met, A power supply unit equipped with the following features.

2. The control unit starts acquiring the results of the detection of human movement by the acquisition unit when the first condition is met, and if a person is detected based on the results of the detection of human movement after a fourth period of time in which no person has been detected, the control unit cancels the power saving mode. The power supply device according to claim 1.

3. After the control unit has started acquiring the results of detecting the person's movement by the acquisition unit after the first condition has been met, if the number of times the person's movement is detected based on the results of detecting the person's movement per second hour is less than or equal to the predetermined threshold, the control unit determines that the second condition has not been met, suppresses the detection of the person's movement by the detection unit for a third hour, and if a person is detected based on the results of detecting the person's movement after the third hour has elapsed, the control unit cancels the power saving mode. The power supply device according to claim 1 or 2.

4. Display unit and A power supply unit that supplies power to the display unit, An acquisition unit that acquires the results of human movement detection by a detection unit provided on the display unit, A first determination unit determines that the first condition is met when the device switches to a power-saving mode that reduces the power supplied to the device compared to the normal mode, and the elapsed time since the acquisition of the human movement detection result by the acquisition unit has been suppressed has exceeded the first hour. A second determination unit determines that the second condition is met if the number of times the person's movement is detected based on the results of detecting the person's movement per second hour is greater than one or more predetermined thresholds, A control unit that, when the power saving mode is set, after the acquisition of the person detection result by the acquisition unit is started when the first condition is met, and then when the second condition is met, cancels the power saving mode, A display device equipped with the following features.

5. The control unit starts acquiring the results of the detection of human movement by the acquisition unit when the first condition is met, and if a person is detected based on the results of the detection of human movement after a fourth period of time in which no person has been detected, the control unit cancels the power saving mode. The display device according to claim 4.

6. After the control unit has started acquiring the results of detecting the person's movement by the acquisition unit after the first condition has been met, if the number of times the person's movement is detected based on the results of detecting the person's movement per second hour is less than or equal to the predetermined threshold, the control unit determines that the second condition has not been met, suppresses the detection of the person's movement by the detection unit for a third hour, and if a person is detected based on the results of detecting the person's movement after the third hour has elapsed, the control unit cancels the power saving mode. The display device according to claim 4 or 5.

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