JP2018055409A - Electronic device, communication system, and electronic device control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To notify the power supply status of an electronic device of an external device wirelessly communicating with the electronic device.SOLUTION: A projector including a non-volatile memory 133, comprises a NFC tag 130 for wirelessly communicating with a terminal device, a volatile memory 175, and a controller 180 for writing information indicating the power supply status of an electronic device in the volatile memory 175. In response to the access to the non-volatile memory 133 by the terminal device, the NFC tag 130 transmits the information indicating the power supply status of the electronic device written in the volatile memory 175, if the information indicating the power supply status of the electronic device written in the volatile memory 175 is in a predetermined status, the information written in the non-volatile memory 133 is transmitted to the terminal device.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electronic device, a communication system, and an electronic device control method.

  Conventionally, a method of operating an electronic device using an external device is known (see, for example, Patent Document 1). Patent Document 1 discloses an imaging device that is remotely operated by an external device.

Japanese Patent No. 5527492

By the way, when an electronic device is operated by an external device, there is a need to transmit the power state of the electronic device to the external device to be useful for the operation of the external device. However, depending on the state of the electronic device, it may not be possible to notify an external device of the accurate power state of the electronic device.
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to notify an external device wirelessly communicating with an electronic device of the power state of the electronic device.

In order to solve the above-described problems, the present invention is an electronic device that includes a first memory and communicates wirelessly with an external device, a volatile second memory, and a power state of the electronic device. A control unit that writes information to the second memory, and the communication unit determines a power state of the electronic device that has been written to the second memory in response to an access to the first memory by the external device. When the information indicating the power state of the electronic device written in the second memory is in a predetermined state, the information written in the first memory is transmitted to the external device. Send.
According to the present invention, the information indicating the power state of the electronic device written in the second memory in response to the access to the first memory by the external device is transmitted to the external device. When the information indicating the power state of the electronic device written in the second memory is a predetermined state, the information written in the first memory is transmitted to an external device. Therefore, the external device can be notified of the power state of the electronic device regardless of the state of the information written in the second memory.

The power supply state of the electronic device includes at least an on state and an off state, and the control unit includes the electronic device when the power state of the electronic device is switched from the off state to the on state. The information indicating that the power state of the device is the on state is written into the second memory.
According to the present invention, when the power state of the electronic device is switched from the off state to the on state, information indicating that the power state of the electronic device is on is written in the second memory. Therefore, when the power supply state of the electronic device is switched on and there is an access from an external device, the information indicating the power supply state of the electronic device is externally transmitted by transmitting the information in the second memory. Can be sent to other devices.

Further, in the present invention, when the information indicating the power state of the electronic device is not written in the second memory, the communication unit displays the power state of the electronic device written in the first memory. The information indicating the off state is transmitted to the external device.
According to the present invention, when information is not written in the second memory, information indicating that the power state of the electronic device written in advance in the first memory is off is transmitted to the external device. Information indicating the power state of the electronic device can be transmitted to an external device.

In addition, according to the present invention, when the power state of the electronic device is the off state, the information written in the second memory is lost.
According to the present invention, when the power state of the electronic device is off, the information written in the second memory is lost. In this case, information indicating the power state of the electronic device is transmitted to the external device by transmitting information indicating that the power state of the electronic device previously written in the first memory is off to the external device. can do.

The communication unit may be a wireless tag including an antenna, a communication control unit that operates according to an induced electromotive force generated in the antenna, and the first memory. When an induced electromotive force is generated in the antenna by wireless communication with the device, the information indicating the power state of the electronic device written in the second memory or the information written in the first memory is Send to external device.
According to the present invention, the communication unit can be configured by a wireless tag that operates by induced electromotive force generated in the antenna. Therefore, even when the power source of the electronic device is off, the communication unit can transmit information indicating the power state of the electronic device to an external device.

The power supply state of the electronic device includes the on state, the off state, and a standby state that can be shifted to the on state by the operation of the control unit, and the control unit includes the standby state When the communication control unit is operated by induced electromotive force generated in the antenna, the power state of the electronic device is shifted to the on state.
ADVANTAGE OF THE INVENTION According to this invention, when a communication control part operate | moves with the induced electromotive force which arose in the antenna, the power supply state of an electronic device can be changed to an ON state.

According to the present invention, the electronic device is a display device that displays an image on a display surface.
According to the present invention, it is possible to notify an external device of the power state of the display device.

In order to solve the above-described problem, the present invention is a communication system including an electronic device and a terminal device, the electronic device including a first memory, wirelessly communicating with the terminal device, and volatilization. And a controller that writes information indicating a power state of the electronic device to the second memory, the first communication unit responding to access to the first memory by the terminal device When the information indicating the power state of the electronic device written in the second memory is transmitted and the information indicating the power state of the electronic device written in the second memory is a predetermined state, The information written in the first memory is transmitted to the terminal device, and the terminal device includes a communication unit that wirelessly communicates with the electronic device, and a display unit, and the electronic device receives the information from the electronic device. The information indicating the source state to be displayed on the display unit.
According to the present invention, the information indicating the power state of the electronic device written in the second memory in response to the access to the first memory by the external device is transmitted to the external device. When the information indicating the power state of the electronic device written in the second memory is a predetermined state, the information written in the first memory is transmitted to an external device. Therefore, the external device can be notified of the power state of the electronic device regardless of the state of the information written in the second memory.

In order to solve the above-described problem, the present invention provides a method for controlling an electronic device including a first memory, a communication unit that wirelessly communicates with an external device, and a volatile second memory, the electronic device Writing the information indicating the power state of the electronic device into the second memory, and the information indicating the power state of the electronic device written in the second memory in response to the access to the first memory by the external device. When the information indicating the power state of the electronic device written in the second memory and the step of transmitting to the external device is in a predetermined state, the information written in the first memory is stored in the external memory. Transmitting to the device.
According to the present invention, the information indicating the power state of the electronic device written in the second memory in response to the access to the first memory by the external device is transmitted to the external device. When the information indicating the power state of the electronic device written in the second memory is a predetermined state, the information written in the first memory is transmitted to an external device. Therefore, the external device can be notified of the power state of the electronic device regardless of the state of the information written in the second memory.

The figure which shows schematic structure of a communication system. The block diagram which shows the structure of a terminal device. The block diagram which shows the structure of a projector. The flowchart which shows operation | movement of a projector. The flowchart which shows operation | movement of an NFC tag. The flowchart which shows operation | movement of a terminal device.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a schematic configuration of a communication system 1 of the present embodiment. The communication system 1 of this embodiment includes a terminal device 10 as an input device and a projector 100 as a display device. The terminal device 10 corresponds to an “external device” of the present invention. The projector 100 corresponds to an “electronic device” and a “display device” of the present invention.

  The terminal device 10 is a small device that a user holds and operates. For example, the terminal device 10 is a portable device such as a mobile phone such as a smartphone, a tablet terminal, or a PDA (Personal Digital Assistants). The terminal device 10 includes a flat terminal device body 11. A display panel 52 is disposed on the surface of the terminal device body 11, and a touch screen 53 (FIG. 2) that detects a user's contact operation is disposed on the surface of the display panel 52. As shown in FIG. 1, the display panel 52 is disposed so as to cover almost the entire surface on one of the widest surfaces of the terminal device body 11. Further, the display panel 52 of the present embodiment is an elongated rectangle, and the user can clearly distinguish the long side and the short side. The terminal device 10 may include various switches as other input devices of the touch screen 53 (see FIG. 2).

  The projector 100 projects image light onto a projection target and forms an image on the projection target surface. The projection target on which the projector 100 projects an image may be a flat surface, a curved surface, or an uneven surface, but in the present embodiment, an example of projecting onto a screen SC (display surface) configured with a flat surface is shown. The screen SC may use a fixed plane such as a wall surface, or may be a hanging or rising curtain screen. FIG. 1 shows the installation state of the projector 100. The projector 100 includes a box-shaped projector main body 101, and a projection opening 114 that projects image light is provided on one surface of the projector main body 101. The projection opening 114 is an opening through which the projection optical system 113 (FIG. 3) built in the projector main body 101 emits light. An operation panel 151 is disposed on the upper surface of the projector main body 101. The operation panel 151 includes a switch for a user to operate the projector 100 and an indicator lamp that indicates an operation state of the projector 100. For example, the operation panel 151 includes a power button that switches the operation state of the projector 100 to a normal operation state or a standby state (power saving state). The normal operation state and the standby state will be described later.

  The projector 100 can be operated by a remote controller 70 that transmits an infrared signal. The remote controller 70 may be a device constituting the communication system 1 or may not be included in the communication system 1. The remote controller 70 includes various switches for operating the projector 100 and transmits a signal corresponding to the operation of the switch to the projector 100 as an infrared signal.

  In addition, the projector 100 includes an NFC (Near Field Communication) tag 130. The NFC tag 130 is an information storage medium called an RFID (Radio Frequency Identifier) tag or a wireless tag. The NFC tag 130 stores various types of information in a built-in nonvolatile memory 133 (see FIG. 3), and can read information stored in the NFC tag 130 from the outside. The NFC tag 130 of the present embodiment uses a passive tag that receives power supply from a device that reads the NFC tag 130. The NFC tag 130 corresponds to the “communication unit”, “wireless tag”, and “first communication unit” of the present invention. The nonvolatile memory 133 corresponds to the “first memory” of the present invention.

  The NFC tag 130 is a tag compliant with the NFC standard established as the ISO standard, but other types of RFID tags such as Felica (registered trademark) may be used. The RFID tag includes a tag using a 125 kHz band radio signal, a tag using a 13.56 MHz band radio signal, a tag using a UHF band (950 MHz band) radio signal, a tag using a 2.45 GHz band radio signal, and the like. is there. In the present embodiment, any of these can be used as the NFC tag 130.

  The NFC tag 130 is installed inside the projector main body 101 on the back side of the upper surface exterior of the projector main body 101 or in the vicinity of the upper surface. Therefore, when a device having an NFC reading function approaches the upper surface of the projector main body 101, the device can read the NFC tag 130. On the upper surface of the projector main body 101, a marker 159 that indicates a position close to the NFC tag 130 is drawn, which serves as a guide for reading the NFC tag 130.

  In the present embodiment, the screen SC has a rectangular shape, and the projector 100 is disposed on the front (front) side of the screen SC. The projector 100 projects image light of a rectangular image (including a still image and a moving image), and a rectangular projection image is formed on the screen SC. In the installed state of FIG. 1, the projector 100 projects image light upward from obliquely below the screen SC, so that the projected image formed on the screen SC is not rectangular but has trapezoidal distortion.

The terminal device 10 and the projector 100 are connected so as to be able to transmit and receive various data by a wireless communication method. This wireless communication system is a short-range wireless communication system such as a wireless LAN (Local Area Network), Bluetooth (registered trademark), or UWB (Ultra Wide Band) conforming to the IEEE 802.11 standard. Further, a wireless communication system using a mobile phone line may be adopted.
In the present embodiment, a configuration in which the terminal device 10 and the projector 100 are connected by a wireless LAN, and control data and content data to be described later are transmitted and received wirelessly is exemplified. The terminal device 10 with which the projector 100 communicates is not limited to one, and FIG. 1 shows a communication system 1 including one projector 100 and one terminal device 10 as an example.

  When establishing wireless communication, the terminal device 10 and the projector 100 use information such as a MAC (Media Access Control) address, an SSID (Service Set IDentifier), an access point name, and a passphrase (password). Identify and connect. Here, these pieces of information are referred to as wireless communication setting information.

  In the communication system 1, the wireless communication setting information of the projector 100 is stored in the NFC tag 130. Therefore, when the terminal device 10 reads the NFC tag 130, wireless communication setting information for wireless connection to the projector 100 can be obtained. If the terminal device 10 and the projector 100 establish wireless communication using the wireless communication setting information, then the terminal device 10 transmits a wireless signal to the projector 100 so that the projector 100 is used as if using the remote controller 70. It can be operated as if

FIG. 2 is a block diagram illustrating a configuration of the terminal device 10.
The terminal device 10 includes a control unit 20 (terminal control unit) that controls each unit of the terminal device 10. The control unit 20 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a DRAM (Dynamic Random Access Memory), and the like (not shown). The basic control program stored in the ROM is read into the DRAM and executed by the CPU. The terminal device 10 is controlled. Further, the control unit 20 functions as a display control unit 21, a communication control unit 22, and an application execution unit 23, which will be described later, by executing a program stored in the storage unit 30 (hereinafter referred to as function blocks). .

  The terminal device 10 includes a storage unit 30. The storage unit 30 is a nonvolatile storage device such as a flash memory or an EEPROM (Electronically Erasable and Programmable Read Only Memory), and is connected to the control unit 20. The storage unit 30 stores various programs and data executed by the control unit 20. In addition, the storage unit 30 stores an application program 31 and content data 33.

  The terminal device 10 includes a wireless communication unit 40. The wireless communication unit 40 includes an antenna, an RF (Radio Frequency) circuit (not shown), and the like, and is connected to the control unit 20. The wireless communication unit 40 is controlled by the control unit 20 and transmits / receives various data to / from the projector 100 according to the wireless communication method described above.

  The terminal device 10 includes a display unit 51. The display unit 51 includes a display panel 52 and is connected to the control unit 20. The display unit 51 displays an image on the display panel 52 by drawing a frame image in accordance with the display resolution of the display panel 52 in a drawing area secured in a DRAM (not shown) based on the image data input from the control unit 20. Let

The terminal device 10 includes a touch screen 53, a switch unit 54, and an operation detection unit 55. The touch screen 53 detects a touch operation on the display panel 52 and outputs a position signal indicating the detected operation position to the operation detection unit 55. The operation detection unit 55 generates coordinate information indicating coordinates on the touch screen 53 based on the position signal input from the touch screen 53 and outputs the coordinate information to the control unit 20.
The switch unit 54 includes operation elements such as switches provided separately from the touch screen 53, and outputs an operation signal to the operation detection unit 55 when these switches are operated. The operation detection unit 55 generates operation information corresponding to the operated operator based on the operation signal input from the switch unit 54 and outputs the operation information to the control unit 20.
Based on the coordinate information or operation information input from the operation detection unit 55, the control unit 20 can detect a contact operation on the display panel 52, an operation of each operator including a switch, and an operation of moving the main body of the terminal device 10.

  The terminal device 10 includes an NFC tag communication unit 61. The NFC tag communication unit 61 corresponds to the “second communication unit” of the present invention. The NFC tag communication unit 61 is a tag reader that reads the NFC tag 130 compliant with the NFC standard and outputs data read from the NFC tag 130 to the control unit 20. The NFC tag communication unit 61 can at least read passive tags. When the terminal device 10 is operating and the reading operation of the NFC tag communication unit 61 is valid, the NFC tag 130 transmits a wireless signal for reading every predetermined time. An induced electromotive force is generated in the NFC tag 130 by this radio signal, and the NFC tag 130 is operated. Further, the NFC tag communication unit 61 receives and decodes the radio signal of the NFC tag 130 and outputs received data to the control unit 20. The NFC tag communication unit 61 may be a reader / writer device capable of writing to the NFC tag 130 in addition to reading data to the NFC tag 130.

The control unit 20 executes a basic control program stored in the storage unit 30 and performs basic control of each unit of the terminal device 10. This control corresponds to the operating system of the terminal device 10, and the display control unit 21, the communication control unit 22, and the application execution unit 23 provide basic services to the application program 31 that operates on the operating system.
The display control unit 21 controls the display unit 51 to display various screens on the display panel 52. The display control unit 21 reads the content data 33 stored in the storage unit 30 and outputs it to the display unit 51. The display unit 51 draws an image according to the display resolution of the display panel 52 in a drawing area secured in a DRAM (not shown) based on the input content data 33, and drives the display panel 52 based on the drawn image.

  The communication control unit 22 controls the wireless communication unit 40 to perform wireless communication with the projector 100. The communication control unit 22 performs transmission / reception of a radio signal having a predetermined frequency, encodes data to be transmitted, and decodes data to be received.

The application execution unit 23 executes the application program 31 stored in the storage unit 30.
The storage unit 30 can store a plurality of application programs 31. The application execution unit 23 selects and executes the application program 31 corresponding to the operation of the touch screen 53, the operation of the switch unit 54, or the data read by the NFC tag communication unit 61 from the NFC tag.

  The content data 33 includes moving image (video) data or still image data, and is content data that can be reproduced by the projector 100. The content data 33 may include a plurality of moving image or still image data, or may include audio data. When the content data 33 is transmitted by the function of the application program 31 executed by the application execution unit 23, the content data 33 is read from the storage unit 30. The application execution unit 23 reproduces the read content data 33 and transmits the image data included in the reproduced content data 33 by the wireless communication unit 40.

FIG. 3 is a block diagram illustrating a configuration of the projector 100.
The projector 100 includes an interface unit (hereinafter abbreviated as I / F unit) 160. The projector 100 is connected to the image supply device via the I / F unit 160. For the I / F unit 160, for example, a DVI interface, a USB interface, a LAN interface, or the like to which a digital video signal is input can be used. In addition, the I / F unit 160 includes, for example, an S video terminal to which a composite video signal such as NTSC, PAL, or SECAM is input, an RCA terminal to which a composite video signal is input, a D terminal to which a component video signal is input, or the like. Can be used. Furthermore, a general-purpose interface such as an HDMI connector conforming to the HDMI (registered trademark) standard can be used for the I / F unit 160. The I / F unit 160 may include an A / D conversion circuit that converts an analog video signal into digital image data, and may be configured to be connected to the image supply device through an analog video terminal such as a VGA terminal. Note that the I / F unit 160 may perform transmission / reception of image signals by wired communication or may perform transmission / reception of image signals by wireless communication.

  The projector 100 includes a projection unit 110 (display unit) that forms an optical image roughly and an image processing system that electrically processes an image signal input to the projection unit 110. The projection unit 110 includes a light source unit 111, a light modulation device 112 including a liquid crystal panel 112A, and a projection optical system 113.

  The light source unit 111 includes a light source such as a xenon lamp, an ultra-high pressure mercury lamp, an LED (Light Emitting Diode), or a laser. The light source unit 111 may include a reflector and an auxiliary reflector that guide light emitted from the light source to the light modulation device 112. The light source unit 111 is a lens group (not shown) for enhancing the optical characteristics of the projection light, a polarizing plate, a light control element that reduces the amount of light emitted from the light source on the path to the light modulation device 112, or the like. There may be.

  The light modulation device 112 includes, for example, a transmissive liquid crystal panel 112A, and the liquid crystal panel 112A receives a signal from an image processing system described later and forms an image. In this case, the light modulation device 112 includes three liquid crystal panels 112A corresponding to the three primary colors of RGB in order to perform color projection, and the light from the light source unit 111 is separated into three color lights of RGB. Is incident on the corresponding liquid crystal panel 112A. The color light modulated by passing through each liquid crystal panel 112 </ b> A is combined by a combining optical system such as a cross dichroic prism and emitted to the projection optical system 113.

  The light modulation device 112 is not limited to a configuration using three transmissive liquid crystal panels 112A, and for example, three reflective liquid crystal panels may be used. In addition, the light modulation device 112 is configured by a system using a single liquid crystal panel and a color wheel, a system using three DMDs (Digital Mirror Device), a system using a single DMD and a color wheel, and the like. May be. Here, when only one liquid crystal panel 112A or DMD is used as the light modulation device 112, a member corresponding to a composite optical system such as a cross dichroic prism is unnecessary. In addition to the liquid crystal panel 112A and the DMD, any configuration that can modulate the light emitted from the light source can be used without any problem.

  The projection optical system 113 radiates the incident light modulated by the light modulation device 112 outward from the projection opening 114 (FIG. 1) using a projection lens, and forms a projection image on the screen SC.

  The projection unit 110 includes a projection optical system driving unit 123 that drives each motor included in the projection optical system 113 according to the control of the control unit 180, and a light source driving unit 121 that drives the light source included in the light source unit 111 according to the control of the control unit 180. Is connected. The projection optical system driving unit 123 and the light source driving unit 121 are connected to the bus 190.

The NFC tag 130 of the projector 100 is connected to the bus 190. The NFC tag 130 includes an antenna 131, an NFC control unit 132, and a nonvolatile memory 133. The NFC tag 130 includes a processor core on which the NFC control unit 132 is mounted and a memory in one chip. The NFC control unit 132 corresponds to the “communication control unit” of the present invention.
An induced electromotive force is generated in the antenna 131 that has received the radio signal transmitted from the terminal device 10. The NFC control unit 132 operates using this induced electromotive force as a power source. The NFC control unit 132 interrupts the control unit 180 when power is supplied by a radio signal for reading emitted from the terminal device 10, and changes the operating state of the projector 100 from the standby state to the normal power-on state. Return to the operating state.

The nonvolatile memory 133 is composed of a nonvolatile memory such as a ROM (Read Only Memory), an EEPROM (Electrically Erasable Programmable Read-Only Memory), and a flash memory, for example. The nonvolatile memory 133 stores wireless communication setting information. The wireless communication setting information includes at least a part of the wireless communication setting information included in the NFC tag 130, and may include the entire wireless communication setting information of the NFC tag 130.
The nonvolatile memory 133 stores information indicating the power state of the projector 100 (hereinafter referred to as power supply information) at a preset address. The power supply information stored in the nonvolatile memory 133 is information indicating that the projector 100 is in a power off state. In the present embodiment, power supply information indicating that a power bit of a volatile memory 175 described later is “0” is stored in a preset address of the nonvolatile memory 133. When the power supply of the projector 100 is cut off and the information cannot be read from the volatile memory 175, the NFC control unit 132 reads the power supply information from the preset address of the nonvolatile memory 133.
The power information of the projector 100 is also stored in a volatile memory 175 described later.

In response to access to the nonvolatile memory 133 by the terminal device 10, the NFC control unit 132 reads information such as wireless communication setting information stored in the nonvolatile memory 133 and transmits the information to the terminal device 10.
Further, when reading information from a preset address of the nonvolatile memory 133, the NFC control unit 132 reads information from a predetermined address of the volatile memory 175 associated with the set address. Power source information of the projector 100 is stored at a predetermined address in the volatile memory 175. A storage element at a predetermined address in the volatile memory 175 is hereinafter referred to as a power bit.
When the power information is stored in the power bit of the volatile memory 175, the NFC control unit 132 reads the power information stored in the power bit and transmits it to the terminal device 10. In addition, when the power bit of the volatile memory 175 is in a predetermined state, the NFC control unit 132 reads the power information stored in the nonvolatile memory 133 and transmits it to the terminal device 10.
In the present embodiment, the predetermined state refers to a state in which the value stored in the power bit is lost. In addition to this, the NFC control unit 132 may read the power supply information from the nonvolatile memory 133 and transmit the power supply information to the terminal device 10 even when reading of the power supply information fails.

  The projector 100 includes a wireless communication unit 141. The wireless communication unit 141 is connected to the bus 190. The wireless communication unit 141 includes an antenna, an RF circuit, and the like (not shown), and communicates with the terminal device 10 in accordance with a wireless communication standard under the control of the control unit 180. The projector 100 and the terminal device 10 are connected so as to be able to transmit and receive various data by a wireless communication method.

The projector 100 includes a power supply unit 143 and a power supply control unit 145.
The power supply unit 143 generates DC power necessary for the operation of each unit of the projector 100 from the commercial power source according to the control of the power supply control unit 145, and supplies it to each unit of the projector 100. The power supply control unit 145 controls the output state of the DC power generated by the power supply unit 143 according to the control of the control unit 180 and controls the power state of the projector 100.

The power state of the projector 100 includes a normal operation state in which the power is on, a standby state, and a power off state.
In the normal operation state, at least the components included in the projector 100 are in a state in which the projection unit 110 can project. That is, power is supplied to each unit of the projection unit 110 and each unit constituting an image processing system described later. The normal operation state includes a state in which the light source of the light source unit 111 is turned off or the luminance is lowered in a state where there is no image projected by the projection unit 110.

The standby state is a state in which at least the control unit 180, the input processing unit 153, and the remote control light receiving unit 155 operate, and the operation of the power button and the infrared signal from the remote control 70 can be detected. The power supply to each unit of the projection unit 110, the projection optical system driving unit 123, the light source driving unit 121, the light modulation device driving unit 122, the image processing unit 163, and the frame memory 165 may be turned off or in a low power state. it can. Further, power supply to the volatile memory 175, the storage unit 170, and the wireless communication unit 141 can be turned off or in a low power state. In the present embodiment, power supply to the wireless communication unit 141 is turned off in the standby state. Accordingly, the power consumption of the projector 100 in the standby state is lower than that in the normal operation state. The standby state is a state in which the power plug of the projector 100 is not removed from the commercial power outlet and the power button is turned off.
The power off state is a state in which the power plug included in the projector 100 is removed from the commercial power outlet and the power supply to each part of the projector 100 by the power supply unit 143 is turned off.

  In the projector 100, an operation panel 151 is disposed on the upper surface of the projector main body 101 (FIG. 1). The operation panel 151 is connected to the input processing unit 153. The input processing unit 153 appropriately turns on or blinks the indicator lamp of the operation panel 151 according to the operation state or setting state of the projector 100 according to the control of the control unit 180. When a switch on the operation panel 151 is operated, an operation signal corresponding to the operated switch is output from the input processing unit 153 to the control unit 180.

  The projector 100 includes a remote control light receiving unit 155 that receives a signal from the remote control 70 used by the user. For example, as shown in FIG. 2, the remote control light receiving unit 155 is installed on the front surface of the projector main body 101 and receives an infrared signal emitted from the remote control 70. Remote control light receiving unit 155 decodes the infrared signal received from remote control 70, generates an operation signal indicating the operation content of remote control 70, and outputs the operation signal to control unit 180.

  The image processing system included in the projector 100 is configured around a control unit 180 that controls the entire projector 100 in an integrated manner. In addition, a storage unit 170, a volatile memory 175, an image processing unit 163, and a light modulation device driving unit 122 are provided. The input processing unit 153 is provided. The control unit 180, the storage unit 170, the volatile memory 175, the image processing unit 163, the light modulation device driving unit 122, and the input processing unit 153 are each connected to the bus 190.

  The control unit 180 includes a CPU, ROM, RAM, DRAM, and the like (not shown), reads a basic control program stored in the ROM to the RAM or DRAM, and executes the program by the CPU to control the projector 100. Further, the control unit 180 functions as a projection control unit 181 and a communication control unit 182 described later by executing a control program stored in the storage unit 170.

  The storage unit 170 is a non-volatile memory such as a flash memory or an EEPROM. The storage unit 170 stores a control program used for controlling the projector 100, content data, and the like.

  The volatile memory 175 is a volatile memory such as DRAM (Dynamic Random Access Memory) or SRAM (Static Random Access Memory). The volatile memory 175 stores and holds power information of a power bit when the projector 100 is in a power-on state or a standby state. The volatile memory 175 loses power information when the projector 100 is turned off. The volatile memory 175 corresponds to the “second memory” of the present invention.

The image processing unit 163 develops the image data received by the I / F unit 160 or the wireless communication unit 141 in the frame memory 165 and processes it. The processing performed by the image processing unit 163 includes, for example, resolution conversion (scaling) processing or resizing processing, shape correction processing such as distortion correction, digital zoom processing, color tone correction processing, and luminance correction processing. The image processing unit 163 executes processing specified by the control unit 180 and performs processing using parameters input from the control unit 180 as necessary. The image processing unit 163 can of course execute a combination of a plurality of processes. The image processing unit 163 reads the processed image data from the frame memory 165 and outputs it to the light modulation device driving unit 122.
The light modulation device driving unit 122 drives the light modulation device 112 based on the image data input from the image processing unit 163. As a result, an image is drawn on the liquid crystal panel 112A of the light modulation device 112, and the drawn image is projected onto the screen SC via the projection optical system 113.

Next, functional blocks provided in the control unit 180 will be described.
The projection control unit 181 controls the image processing unit 163 to cause the frame memory 165 to draw an image based on the image data. Further, the projection control unit 181 controls the light modulation device driving unit 122 to draw the image drawn in the frame memory 165 on the liquid crystal panel 112A of the light modulation device 112. An image drawn on the liquid crystal panel 112 </ b> A of the light modulation device 112 is projected as a projection image on the screen SC via the projection optical system 113.

  Further, the projection control unit 181 writes the power supply information of the projector 100 in the power supply bit of the volatile memory 175. The power information is 1-bit information indicating the power state of the projector 100. The power information written in the volatile memory 175 by the projection control unit 181 includes “1” indicating that the power state of the projector 100 is the power on state and “0” indicating that the power state is the standby state or the power off state. Is included.

In the power off state, when the power plug of the projector 100 is inserted into a commercial power outlet and the power button on the operation panel 151 or the power button on the remote control 70 is turned on, the projector 100 is in a power on state (normal operation state). Migrate to When the projector 100 is switched to the power-on state, the projection control unit 181 writes the value “1” in the power bit of the volatile memory 175.
When the power plug of the projector 100 is inserted into the outlet, but the power button on the operation panel 151 or the power button on the remote control 70 is not turned on, the projector 100 shifts from the power-off state to the standby state. In addition, when the power button on the operation panel 151 or the power button on the remote controller 70 is turned off in the power-on state, the projector 100 shifts to the standby state. When the projector 100 shifts to the standby state, the projection control unit 181 rewrites the value of the power bit in the volatile memory 175 to “0”. In the standby state, power is supplied from the power supply unit 143 to the volatile memory 175, and the value “0” of the power bit in the volatile memory 175 is maintained without being lost.
Further, in the power-on state or the standby state, when the power plug of the projector 100 is removed from the commercial power outlet and the power state is turned off, the supply of power to the volatile memory 175 is stopped. In this case, the power bit written in the volatile memory 175 is lost.

  Further, when the NFC tag 130 is operated by the induced electromotive force generated in the antenna 131 in the standby state, an interrupt signal is input to the control unit 180. When the interrupt signal is input, the projection control unit 181 controls the power supply control unit 145 to supply power to each unit of the projector 100 and return the projector 100 from the standby state to the normal operation state.

  The communication control unit 182 controls the wireless communication unit 141 to perform wireless communication with the terminal device 10. The communication control unit 182 establishes wireless communication with the terminal device 10, receives control data and image data transmitted from the terminal device 10, and processes the received data. For example, when the wireless communication unit 141 receives image data, the communication control unit 182 temporarily stores the image data in the RAM or the storage unit 170 of the control unit 180. The image data temporarily stored in the RAM of the control unit 180 or the storage unit 170 is projected onto the screen SC under the control of the projection control unit 181.

FIG. 4 is a flowchart showing the operation of the projector 100.
At the start of the operation of FIG. 4, the projector 100 is in a standby state. In the standby state, the projector 100 waits for an interrupt signal to be input, and stops supplying power to each unit until the interrupt signal is input to maintain the standby state.
When a power button provided on the operation panel 151 or the remote controller 70 is turned on, or when the terminal device 10 is brought close to the marker 159, an interrupt signal is input to the control unit 180 (step S1). When the interrupt signal is input, the control unit 180 controls the power control unit 145 to supply power to each unit of the projector 100. Thereby, the projector 100 returns to the normal operation state (step S2), the light source of the light source unit 111 is turned on, and the wireless communication unit 141 is activated.

  The control unit 180 that has returned to the normal operation state rewrites the value of the power bit of the volatile memory 175 to “1” (step S3). Next, the control unit 180 determines whether or not a connection request based on the wireless communication setting information has been received (step S4). When the connection request has not been received (step S4 / NO), the control unit 180 stands by until a connection request is received. When a connection request is received (step S4 / YES), the control unit 180 establishes wireless communication with the terminal device 10 that has received the connection request (step S5).

  Next, the control unit 180 determines whether data has been received from the terminal device 10 that has established wireless communication (step S6). The terminal device 10 displays an operation screen on the display panel 52 by the function of the application program 31 and waits for an operation. The operation screen is a screen on which icons or the like imitating operation switches are arranged. When these icons or the like are touch-operated, the terminal device 10 detects the operation on the touch screen 53. Here, when the detected operation is a request to display content data, the terminal device 10 reads the content data from the storage unit 30 and reproduces it, and transmits the image data included in the reproduced content data 33 to the projector 100. When the detected operation is an operation for instructing the end of the operation of the projector 100, the terminal device 10 generates control data for instructing the end of the operation and transmits the control data to the projector 100.

  Control unit 180 stands by until data is received from terminal device 10 (step S6 / NO). The control unit 180 receives data from the terminal device 10 (step S6 / YES), and when the received data is image data (step S7 / YES), draws an image in the frame memory 165 based on the received image data. Let The controller 180 causes the image drawn in the frame memory 165 to be drawn on the liquid crystal panel 112 </ b> A of the light modulation device 112. The image drawn on the liquid crystal panel 112A of the light modulation device 112 is projected as a projection image on the screen SC via the projection optical system 113 (step S8).

  In addition, when the received data is control data for instructing the end of the operation of the projector 100 by the terminal device 10 (steps S7 / NO and S9 / YES), the control unit 180 determines the value of the power bit of the volatile memory 175. Is rewritten to “0” (step S11). When the value of the power supply bit is rewritten to “0”, the control unit 180 shifts to the standby state (step S12) and ends this process. If the received data is not control data for instructing the end of the operation (step S9 / NO), the control unit 180 executes processing corresponding to the received data (step S10), returns to step S6, and returns to the terminal Wait until data is received from the device 10.

  When the power plug of the projector 100 is removed from the commercial power outlet, the control unit 180 ends the process without rewriting the value of the power bit in the volatile memory 175. When the projector 100 is turned off, power is not supplied to the volatile memory 175, so that information stored in the volatile memory 175 is lost.

FIG. 5 is a flowchart showing the operation of the NFC tag 130.
The flow shown in FIG. 5 is a flow showing the operation of the NFC tag 130, and the program executed by the processor core constituting the NFC control unit 132 is not limited to that shown in this flowchart.
When the user of the terminal device 10 brings the terminal device 10 close to the marker 159, NFC communication is established between the NFC tag 130 and the terminal device 10 (step S21).
The NFC control unit 132 operates by induced electromotive force generated by wireless communication with the terminal device 10 and outputs an interrupt signal to the control unit 180 (step S22). When outputting the interrupt signal, the NFC control unit 132 starts reading data from the nonvolatile memory 133 (step S23). The NFC control unit 132 first determines whether or not the address of the nonvolatile memory 133 from which data is read is a set address (step S24). When it is not the set address (step S24 / NO), the NFC control unit 132 reads data from the nonvolatile memory 133. Also, if the NFC control unit 132 is a set address (step S24 / YES), whether or not the power information can be read from the power bit of the volatile memory 175 associated with the set address. Is determined (step S25). When the projector 100 is in the power off state, the NFC control unit 132 cannot access the volatile memory 175 and cannot read the power information from the power bit of the volatile memory 175. If it is not readable (step S25 / NO), the NFC control unit 132 reads power supply information from a preset address in the nonvolatile memory 133 (step S26). Information indicating that the power bit of the volatile memory 175 is “0” is stored at a preset address of the nonvolatile memory 133. If the data can be read (step S25 / YES), the NFC control unit 132 reads the power supply information from the power supply bit of the volatile memory 175 (step S27).
When the NFC control unit 132 reads the power supply information indicating that the power supply bit is “0” from the nonvolatile memory 133, the information indicating that the power supply state of the projector 100 is the power-off state is included in the read information. May be added. This is for distinguishing between the case where “0” is read as the power supply information from the power supply bit of the volatile memory 175 and the case where the power supply information is read from the nonvolatile memory 133. That is, the NFC control unit 132 adds information for distinguishing between the case where the power supply state of the projector 100 is the power-off state and the case where the projector 100 is in the standby state to the terminal device 10 as the power supply information.

  Next, the NFC control unit 132 determines whether or not the data reading is completed (step S28). If the reading is not completed (step S28 / NO), the NFC control unit 132 returns to the determination of step S24 and reads the data. Further, when the reading is completed (step S28 / YES), the NFC control unit 132 transmits the read data to the terminal device 10 (step S29).

  In steps S25 and S26, the operation of reading the power bit of the volatile memory 175 may be executed in hardware. That is, when the accessed address of the nonvolatile memory 133 corresponds to the power bit of the volatile memory 175, the process of switching the access destination to the power bit of the volatile memory 175 may be executed by hardware.

FIG. 6 is a flowchart showing the operation of the terminal device 10.
When the user holds the terminal device 10 in his / her hand and brings the terminal device 10 held in his / her hand close to the marker 159 of the projector main body 101, NFC communication is established between the terminal device 10 and the NFC tag 130 (step S31). . When the NFC communication is established, the terminal device 10 acquires the information of the NFC tag 130 by the NFC tag communication unit 61 (step S32). The information acquired in step S32 includes wireless communication setting information, power supply information, and the like.

  When the terminal device 10 acquires the information of the NFC tag 130, the terminal device 10 activates and executes the application program 31 (step S33). The terminal device 10 executes the application program 31, and determines whether or not the projector 100 is in a power-off state based on the power information acquired from the NFC tag 130 (step S34). If the power is off (step S34 / YES), the terminal device 10 displays a preset message on the display panel 52 under the control of the application program 31 (step S35). This message is, for example, a message such as “The projector 100 is not powered. Please connect the power plug to an electrical outlet”.

  If the terminal device 10 is not in the power-off state (step S34 / NO), the terminal device 10 determines whether the projector 100 is in the standby state (step S36). In the standby state (step S36 / YES), the terminal device 10 displays a preset message on the display panel 52 under the control of the application program 31 (step S37). This message is, for example, a message such as “It may take several minutes to connect to the projector 100”.

  If the determination in step S36 is negative (step S36 / NO), the terminal device 10 establishes wireless communication with the projector 100 based on the acquired wireless communication setting information (step S38). When a message is displayed in step S35 or step S37 (step S35 or S37), the terminal device 10 stands by until the projector 100 is activated. When the projector 100 is activated, wireless communication is established with the projector 100 based on the acquired wireless communication setting information (step S38).

  Next, the terminal device 10 displays an operation screen by the function of the application program 31 and waits for an operation (step S39). For example, a list of content data 33 stored in the storage unit 30 is displayed on the operation screen. The user can select content data 33 to be projected by the projector 100 from the displayed list of content data 33 by a touch operation. In addition, an icon or the like imitating an operation switch is displayed on the operation screen. The user can instruct the terminal device 10 to end the operation of the projector 100 by operating this icon.

  The terminal device 10 detects a touch operation on the operation screen with the touch screen 53. If no touch operation is detected (step S39 / NO), the terminal device 10 stands by until a touch operation is detected. Further, when a touch operation is detected (step S39 / YES), the terminal device 10 determines whether or not the detected touch operation is an operation for instructing the end of the operation of the projector 100 (step S40). When the operation is an instruction to end the operation (step S40 / YES), the terminal device 10 ends the application program 31 and disconnects wireless communication with the projector 100 (step S41). When the detected touch operation is not an operation for instructing the end of the operation of the projector 100 (step S40 / NO), the terminal device 10 executes a process according to the detected touch operation (step S42), and step S39. Return to the determination.

As described above, the projector 100 according to the present embodiment includes the nonvolatile memory 133, the NFC tag 130 that communicates wirelessly with the terminal device 10, the volatile memory 175, and the information indicating the power state of the projector 100 are volatile. And a control unit 180 for writing to the memory 175.
The NFC tag 130 transmits information indicating the power state of the projector 100 written in the volatile memory 175 in response to the access to the nonvolatile memory 133 by the terminal device 10. In addition, when the information indicating the power state of the projector 100 written in the volatile memory 175 is in a predetermined state, the NFC tag 130 transmits the information written in the nonvolatile memory 133 to the terminal device 10.
Therefore, the power status of the projector 100 can be notified to the terminal device 10 regardless of the status of the information written in the volatile memory 175.

The power state of the projector 100 includes at least an on state and an off state. The control unit 180 writes information indicating that the power state of the projector 100 is on in the volatile memory 175 when the power state of the projector 100 is switched from the off state to the on state.
Accordingly, when there is an access from the terminal device 10 with the power state of the projector 100 switched to the on state, the information in the volatile memory 175 is read and transmitted to the terminal device 10, thereby changing the power state of the projector 100. Information indicating can be transmitted.

In addition, when the information indicating the power state of the projector 100 is not written in the volatile memory 175, the NFC tag 130 indicates that the power state of the projector 100 written in the nonvolatile memory 133 is in an off state. Is transmitted to the terminal device 10.
Therefore, information indicating the power state of the projector 100 can be transmitted to the terminal device 10.

  Further, in the volatile memory 175, the written information is lost when the power supply state of the projector 100 is off. In this case, the information indicating the power state of the projector 100 is transmitted to the terminal device 10 by transmitting to the terminal device 10 information indicating that the power state of the projector 100 written in advance in the nonvolatile memory 133 is OFF. Can be sent.

The NFC tag 130 includes an antenna 131, an NFC control unit 132 that operates by induced electromotive force generated in the antenna 131, and a nonvolatile memory 133. When an induced electromotive force is generated in the antenna 131 by wireless communication with the terminal device 10, the NFC control unit 132 is written in the information indicating the power state of the projector 100 written in the volatile memory 175 or the nonvolatile memory 133. Information is transmitted to the terminal device 10.
Therefore, even when the power of the projector 100 is in the off state, the NFC tag 130 can transmit information indicating the power state of the projector 100 to the terminal device 10.

Further, the power state of the projector 100 includes an on state, an off state, and a standby state that can be shifted to an on state by the operation of the control unit 180. The control unit 180 shifts the power state of the projector 100 to the on state when the NFC control unit 132 is operated by the induced electromotive force generated in the antenna 131 in the standby state.
Therefore, when the NFC control unit 132 is operated by the induced electromotive force generated in the antenna 131, the power state of the projector 100 can be shifted to the on state.

  Further, since the NFC tag 130 is mounted on the projector 100, the power state of the projector 100 can be transmitted to the terminal device 10.

The above-described embodiment shows an example of a preferred embodiment of the present invention. The embodiment of the present invention is not limited to this, and various modifications may be made without departing from the scope of the present invention. Is possible.
For example, in the above-described embodiment, a case has been described in which a storage element at a predetermined address in the volatile memory 175 included in the projector 100 is used as a power supply bit for writing power supply information of the projector 100. As another configuration, a part of the memory included in the NFC tag 130 may be configured as a volatile memory. That is, the NFC tag 130 includes a nonvolatile memory 133 and a volatile memory 175 as memories. The control unit 180 of the projector 100 stores the power supply information in the volatile memory 175 of the NFC tag 130.

  In the above-described embodiment, the case where the electronic device is the projector 100 is shown, but the electronic device may not be the projector 100. For example, the electronic device may be a printer, a TV receiver, a hard disk recorder, or the like.

  For example, although the configuration in which one terminal apparatus 10 performs an operation by performing wireless communication with one projector 100 has been described, a plurality of terminal apparatuses 10 may control one or a plurality of projectors 100. A plurality of projectors 100 may be controlled by one terminal device 10. Further, the projector 100 may be configured to be able to identify the terminal device 10.

  For example, in the above embodiment, the front projection type projector 100 that projects from the front of the screen SC is shown as an example of the display device, but the present invention is not limited to this. For example, a rear projection (rear projection) type projector that projects from the back side of the screen SC can be employed as the display device. In addition, a liquid crystal monitor or a liquid crystal television that displays an image on a liquid crystal display panel may be employed as the display device. A PDP (plasma display panel), CRT (cathode ray tube) display, SED (Surface-conduction Electron-emitter Display), or the like may be used as a display device. In addition, a self-luminous display device such as a monitor device or a television receiver that displays an image on an organic EL display panel called an OLED (Organic light-emitting diode) or an OEL (Organic Electro Luminescence) display may be adopted. . When the present invention is applied to a configuration including these display devices, a useful effect can be obtained as in the above embodiment.

  Moreover, in the said embodiment, although the portable terminal device 10 which has the flat terminal device main body 11 as a terminal device, and was operated by the user's hand was mentioned as an example, this invention is shown to this. It is not limited. For example, a portable game machine, a portable reproduction device that reproduces music or video, and the like can be used as the terminal device 10. Furthermore, the terminal device 10 may have a configuration including a hardware keyboard other than the display panel 52.

  Further, although the NFC tag 130 has been described as being installed in the projector main body 101, the NFC tag 130 may be installed in a separate housing from the projector main body 101. In this case, the separate housing and the projector main body 101 are connected by a cable. As a result, the NFC tag 130 can be arranged at a position away from the projector main body, which is more convenient.

  Moreover, each function part shown in FIG.2 and FIG.3 shows a functional structure, and a specific mounting form is not restrict | limited in particular. That is, it is not always necessary to mount hardware corresponding to each function unit individually, and it is of course possible to adopt a configuration in which the functions of a plurality of function units are realized by one processor executing a program. In addition, in the above embodiment, a part of the function realized by software may be realized by hardware, or a part of the function realized by hardware may be realized by software. In addition, specific detailed configurations of other parts of the communication system 1 can be arbitrarily changed without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Communication system, 10 ... Terminal device (external device), 11 ... Terminal apparatus main body, 20 ... Control part, 22 ... Communication control part, 23 ... Application execution part, 30 ... Memory | storage part, 31 ... Application program, 33 ... Content data 40 ... Wireless communication unit 53 ... Touch screen 54 ... Switch unit 55 ... Operation detection unit 61 ... NFC tag communication unit (second communication unit) 70 ... Remote controller 100 ... Projector (electronic device, display) (Device), 101 ... projector main body, 110 ... projection unit, 111 ... light source unit, 112 ... light modulation device, 112A ... liquid crystal panel, 113 ... projection optical system, 114 ... projection aperture, 121 ... light source drive unit, 122 ... light Modulator driving unit, 123 ... projection optical system driving unit, 126 ... frame memory, 130 ... NFC tag (communication unit, first communication unit), 13 ... antenna, 132 ... NFC control unit (communication control unit), 133 ... nonvolatile memory (first memory), 141 ... wireless communication unit, 143 ... power supply unit, 145 ... power supply control unit, 151 ... operation panel, 153 ... input Processing unit, 155 ... Remote control light receiving unit, 159 ... Marker, 160 ... I / F unit, 163 ... Image processing unit, 165 ... Frame memory, 170 ... Storage unit, 175 ... Volatile memory (second memory), 180 ... Control 181 ... Projection control unit, 182 ... Communication control unit, 190 ... Bus, SC ... Screen.

Claims (9)

Electronic equipment,
A communication unit including a first memory and wirelessly communicating with an external device;
A volatile second memory;
A controller that writes information indicating the power state of the electronic device to the second memory,
The communication unit transmits the information indicating the power state of the electronic device written in the second memory in response to access to the first memory by the external device, and is written in the second memory An electronic device that transmits the information written in the first memory to the external device when the information indicating the power state of the electronic device is in a predetermined state. The power state of the electronic device includes at least an on state and an off state,
The control unit writes the information indicating that the power state of the electronic device is the on state in the second memory when the power state of the electronic device is switched from the off state to the on state. Item 1. An electronic device according to Item 1.   When the information indicating the power state of the electronic device is not written in the second memory, the communication unit determines that the power state of the electronic device written in the first memory is the off state. The electronic device according to claim 2, wherein the information to be transmitted is transmitted to the external device.   4. The electronic device according to claim 2, wherein the information written in the second memory is lost when the power state of the electronic device is the off state. The communication unit is a wireless tag including an antenna, a communication control unit that operates by induced electromotive force generated in the antenna, and the first memory.
The communication control unit includes the information indicating the power state of the electronic device written in the second memory or the first memory when an induced electromotive force is generated in the antenna by wireless communication with the external device. The electronic device according to claim 2, wherein the information written in is transmitted to the external device. The power state of the electronic device includes the on state, the off state, and a standby state that can be shifted to the on state by the operation of the control unit,
The electronic device according to claim 5, wherein the control unit shifts the power state of the electronic device to the ON state when the communication control unit is operated by induced electromotive force generated in the antenna in the standby state.   The electronic device according to claim 1, wherein the electronic device is a display device that displays an image on a display surface. A communication system comprising an electronic device and a terminal device,
Electronic equipment
A first communication unit including a first memory and wirelessly communicating with the terminal device;
A volatile second memory;
A controller that writes information indicating the power state of the electronic device to the second memory,
The first communication unit transmits the information indicating the power state of the electronic device written in the second memory in response to access to the first memory by the terminal device, and is written in the second memory. If the information indicating the power state of the electronic device is in a predetermined state, the information written in the first memory is transmitted to the terminal device,
The terminal device
A second communication unit that wirelessly communicates with the electronic device;
A display unit,
The communication system which displays the said information which shows the power supply state of the said electronic device received from the said electronic device on the said display part. A method for controlling an electronic device comprising a first memory, a communication unit that wirelessly communicates with an external device, and a volatile second memory,
Writing information indicating the power state of the electronic device into the second memory;
Transmitting the information indicating the power state of the electronic device written in the second memory in response to access to the first memory by the external device to the external device;
When the information indicating the power state of the electronic device written in the second memory is a predetermined state, transmitting the information written in the first memory to the external device;
A method for controlling an electronic device, comprising:

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