Projection device, projection control method, and projection control program

Abstract

To provide a projector which is not lit up by a false operation even if a power source button is pressed when the projector is being carried.SOLUTION: The present invention includes: a connector 50 for connecting a picture output apparatus 200; a semiconductor switch 12 for supplying a DC power of a battery power source E to a projection unit 30; and a stand-by power source control unit 11 connected to the battery power E, the stand-by power source control unit short-circuiting the semiconductor switch at a timing when a machine switch 13 is shifted. The stand-by power source control unit 11 prohibits short-circuit of the semiconductor switch 12 when a power source voltage 5 V is not detected from a power source pin of the connector 50.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a projection device, Projection control a method, and Projection control a program, and more particularly, to a small and lightweight projection device that can be driven by a battery power source.

Background Art

[0002] Conventionally, development of projection devices has been carried out. (For example, Patent Document 1). In recent years, such projection devices have also been studied for portable projection devices that can be carried around.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when a portable projection device is carried in a bag, there is a possibility that the power button may be accidentally pressed when it is pushed by something. If projection starts inside the bag, unnecessary power consumption will occur. In addition, problems occur due to heat accumulation caused by the light source and projection light.

[0005] An object of the present invention is that when carrying a projection device, the projection device does not light up due to an incorrect operation even if the power button is pressed.

[0006] The present invention has been made in view of such a background, and when carrying a projection device, the power button can be prevented from lighting up due to an incorrect operation even if it is pressed. The present invention provides a projection device, Projection device a control method, and a program.

Means for Solving the Problems

[0007] In order to solve the above problems, a projection apparatus according to the present invention is a projection apparatus configured to be connectable to a commercial power supply as an AC power supply and a battery power supply as a DC power supply as a lighting power supply for a projection light source, and includes a connector for connecting a video output device, a first switch for supplying DC power of the battery power supply to a projection unit, control means for determining which of the battery power supply and the commercial power supply is connected, and when it is determined that the battery power supply is connected and a user operation on an operation button for lighting the projection light source is received, determination means for determining whether the voltage of a power supply pin of the connector is equal to or higher than a predetermined threshold value, or whether a video signal is input from the connector. The control means short-circuits the first switch to start lighting of the projection light source when it is determined by the determination means that the voltage of the power supply pin of the connector is equal to or higher than a predetermined threshold value, or a video signal is input from the connector. When it is determined that the commercial power supply is connected and a user operation on the operation button is received, without determining whether the voltage of the power supply pin of the connector is equal to or higher than a predetermined threshold value, or whether a video signal is input from the connector, Supply the power from the commercial power source to the projection unit it is characterized in that the projection light source is lit.

Advantages of the Invention

[0008] According to the present invention, when carrying the projection apparatus, even if the power button is pressed, the projection apparatus does not light up due to an incorrect operation.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

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Figure 6

Figure 7

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings. Note that each drawing only schematically shows the present embodiment to the extent that it can be sufficiently understood. In each drawing, common components and similar components are denoted by the same reference numerals, and redundant descriptions thereof are omitted.

[0011] (First Embodiment) FIG. 1 is a configuration diagram of a projection device according to a first embodiment of the present invention. The projection system S includes a projection device 100, a video output device 200 (external device), an HDMI (registered trademark) cable 150 connecting these, and a battery power supply E that supplies DC power to the projection device 100.

[0012] The projection device 100 includes a standby power control unit 11, a main CPU 20, a projection unit 30, an HDMI receiver 40, a semiconductor switch 12, a mechanical switch 13, and a FAN 60. As the semiconductor switch 12, a high-performance semiconductor power switch incorporating a protection circuit against overcurrent and overheating and a circuit for absorbing energy such as an inductive load can be used. An IPD (Intelligent Power Device), IPS (Intelligent Power switch), Smart Switch, or Hi-side / Lo-side switch that can maintain its function as a switch without being destroyed even in an abnormal state such as a short circuit can be used.

[0013] The battery power supply E is a secondary battery, but a primary battery may also be used. The negative electrode of the battery power supply E is connected to the standby power control unit 11, the main CPU 20, the projection unit 30, and the FAN 60. The positive electrode of the battery power supply E is connected to the standby power control unit 11 and one end of the semiconductor switch 12. The other end of the semiconductor switch 12 is connected to the main CPU 20, the projection unit 30, and the FAN 60. Both ends of the mechanical switch 13 are connected to the standby power control unit 11.

[0014] The projection device 100 is configured to be able to connect a commercial power supply as an AC power supply and a battery power supply as a DC power supply as the lighting power supply for the projection light source. When the standby power control unit 11 (control means, determination means) receives a user operation on an operation button for lighting the projection light source, it determines whether the voltage of the power pin of the connector is equal to or higher than a predetermined threshold value.

[0015] However, the main CPU 20 (control means) can first determine whether it is battery-driven. The main CPU 20 (control means) can determine whether it is battery-driven, for example, based on the voltage value input from the power supply. Alternatively, when it is battery-driven, since a pulse signal is output from the battery, which is different from when driven by an AC power supply, it can be determined whether it is battery-driven.

[0016] In this way, by determining whether it is battery-driven before determining whether the voltage of the power pin of the connector is equal to or higher than a predetermined threshold value, when the projection device 100 is determined to be connected to a commercial power supply as an AC power supply as the lighting power supply for the projection light source, when a user operation on an operation button (power button) for lighting the projection light source is received, it is not necessary to determine whether the voltage of the power pin of the connector is equal to or higher than a predetermined threshold value. When a commercial power supply as an AC power supply is connected as the lighting power supply for the projection light source, there is no need to prohibit the lighting of the projection light source. Therefore, when the power button is pressed by a user operation, the light source lights up immediately. Thus, the user can use the projection device 100 without discomfort.

[0017] A +5V power voltage (5VPower) is input to the standby power control unit 11 from the video output device 200 via the HDMI cable 150 and the HDMI receiver 40. Also, both ends of the mechanical switch 13 are connected to the standby power control unit 11. In this state, when the mechanical switch 13 transitions from the OFF state to the ON state, the standby power control unit 11 sets the semiconductor switch 12 to the ON state when it can detect the +5V power voltage from the video output device 200.

[0018] On the other hand, when the standby power control unit 11 cannot detect the +5V power voltage from the video output device 200, it maintains the semiconductor switch 12 in the OFF state. In other words, when the standby power control unit 11 cannot detect the +5V power voltage from the video output device 200, it prohibits the driving of the main CPU 20, the projection unit 30, and the FAN 60.

[0019] After startup, the main CPU 20 transmits an HPD (Hot Plug Detect) signal to the video output device 200 via the HDMI receiver 40 and the HDMI cable 150. Thereby, the connection between the projection device 100 and the video output device 200 is established. The main CPU 20 processes the video signal output by the HDMI receiver 40 and outputs the processed image to the projection unit 30. Note that the main CPU 20 exchanges various information with the video output device 200 using a CEC (Consumer Electronics Control) signal.

[0020] The projection unit 30 projects the processed image processed by the main CPU 20 onto an external projection object (such as a screen). Note that the projection unit 30 includes a light source (not shown) and is prone to heat generation. The FAN 60 air-cools the projection unit 30.

[0021] The HDMI receiver 40 receives a video signal from the video output device 200 and outputs the received video signal to the main CPU 20. Also, the HDMI receiver 40 uses a DDC (Display Data Channel) signal to transmit device information of the projection device 100 to the video output device 200.

[0022] The video output device 200 is, for example, a PC (Personal Computer), a BD (Blu-ray Disc) player, etc., and includes a CPU 220, an image processing unit 230, an HDMI transmitter 240, and a connector 250. The CPU 220 controls the entire video output device 200. The image processing unit 230 includes a VRAM (not shown) and processes the image stored in the VRAM based on the control of the CPU 220. The HDMI transmitter 240 transmits a video signal to the HDMI receiver 40 of the projection device 100.

[0023] The HDMI cable 150 transmits a video signal from the video output device 200 to the projection device 100. Also, the HDMI cable 150 transmits device information and authentication information between the video output device 200 and the projection device 100. The connectors 50, 250 are 19-pin connectors, and the pin assignment is shown in FIG. 2. For example, pins 1 to 9 are TMDS_DATA, pins 10 to 12 are TMDS_CLOCK. Also, pin 17 is ground, pin 18 is "5V" Power, and pin 19 is "HPD". Note that in TMDS (Transition Minimized Differential Signaling), four channels are grouped and used as a unit called a "link". Each of the four channels is assigned one channel for each of the RGB video signals, and one channel is assigned for the signal for synchronizing the clock frequency.

[0024] FIG. 3 is a flowchart for explaining the operation of the projection device of the present invention. This flow starts when the battery power supply E is attached and repeats until the battery power supply E is depleted or removed. The standby power control unit 11 (determination means) first performs general initialization processing (S1), and then determines whether the mechanical switch 13 is turned on (Power key IN) (S2). That is, the standby power control unit 11 determines the transition of the mechanical switch 13 from the OFF state to the ON state. If the mechanical switch 13 does not transition from the OFF state to the ON state (No in S2), the standby power control unit 11 executes other polling processes that periodically make inquiries (S3), and repeats the determination of turning on the mechanical switch 13 (S2).

[0025] On the other hand, if the mechanical switch 13 transitions from the OFF state to the ON state (Yes in S2), the standby power control unit 11 (determination means) determines whether the 5V power supply voltage (5V Power) from the video output device 200 has been detected (S4). If the 5V power supply voltage is not detected (No in S4), the standby power control unit 11 executes other polling processes (S3), and repeats the determination of turning on the mechanical switch 13 (S2). On the other hand, if the 5V power supply voltage is detected (Yes in S4), the standby power control unit 11 sets the semiconductor switch 12 to the ON state (S5).

[0026] In S4, when the standby power control unit 11 (determination means) determines whether the 5V power supply voltage (5V Power) from the video output device 200 has been detected, since the projection device 100 and the video output device 200 are connected by the HDMI cable 150, even when no video source is output from the video output device 200, the power supply voltage is not completely 0V. Therefore, for example, it can be determined based on whether the voltage of the power pin of the connector 50 of the projection device 100 is equal to or higher than a predetermined threshold value.

[0027] As a result, the main CPU 20, the projection unit 30, and the FAN 60 are started, and the light source of the projection unit 30 is lit. That is, when the standby power control unit 11 detects the transition of the mechanical switch 13 and the 5V power supply voltage, it starts the main CPU 20, the projection unit 30, and the FAN 60. After the process of S5, the standby power control unit 11 (determination means) executes other polling processes (S3), and repeats the determination of turning on the mechanical switch 13 (S2).

[0028] FIG. 4 is an explanatory diagram for explaining the HDMI negotiation flow. Here, it is described assuming that an HDMI cable 150 is connected between the projection device 100 and the video output device 200. When the video output device 200 is powered on, the 5V power pin of the connector 250 becomes HIGH level. As a result, the 5V power pin of the connector 50 of the projection device 100 also becomes HIGH level. The projection device 100 detects the HIGH level state of the 5V power pin by the standby power control unit 11 (S4), and the main CPU 20 transmits an HPD signal to the video output device 200 (S10).

[0029] The video output device 200 detects the HPD signal (S11) and instructs the projection device 100 to transmit EDID (Extended Display Identification Data) (S12). The projection device 100 returns the EDID to the video output device 200 (S13). The video output device 200 reads the EDID (S14). Here, the EDID is data stored in a sink device such as the projection device 100. This data includes "resolution", "refresh rate", "color depth" that the projection device 100 can display, and corresponding "audio format", etc.

[0030] After the process of S14, the video output device 200 determines the capabilities of the sink device (S15) and determines the capabilities of the AV format (S16). Further, the video output device 200 and the projection device 100 perform HDCP (High-bandwidth Digital Content Protection) authentication (S17, S18). HDCP authentication is an encryption technology that prevents illegally copying copyrighted video content while it is being transmitted to a display device. In HDCP authentication, the video sending side (HDCP transmitter) such as a computer and the receiving side (HDCP receiver) such as a display each have a unique encryption key built in, and this is used to authenticate that they are legitimate HDCP-compatible devices, exchange encryption keys, and encrypt and decrypt video data.

[0031] After the HDCP authentication of S17 and S18 is completed, the video output device 200 performs TMDS transmission to the projection device 100 (S19). As a result, the projection device 100 receives TMDS (S20).

[0032] As described above, according to the projection device 100 of the present embodiment, when connected to the video output device 200 by the HDMI cable 150 and the video output device 200 is driving, when the standby power control unit 11 detects the transition of the mechanical switch 13 and the 5V power supply voltage from the video output device 200, the semiconductor switch 12 turns on. As a result, the main CPU 20, the projection unit 30, and the FAN 60 are activated, and the light source of the projection unit 30 lights up.

[0033] (Second Embodiment) The standby power control unit 11 of the first embodiment detects the 5V power supply voltage from the video output device 200, but it may also detect a video signal.

[0034] FIG. 5 is a configuration diagram of a projection device according to a second embodiment of the present invention. Compared with the projection device 100 of the first embodiment, the projection device 101 of the present embodiment does not have a signal line for the +5V power supply connected between the HDMI receiver 40 and the standby power control unit 11. That is, the +5V power supply is connected between the HDMI receiver 40 and the HDMI transmitter 240. Also, various signal lines are connected between the HDMI receiver 40 and the standby power control unit 11. When the video output device 200 performs TMDS transmission to the projection device 101, the projection device 101 receives TMDS and detects a video signal. In this way, the detection of the video signal from the video output device 200 is performed by the TMDS channel between the HDMI transmitter 240 of the video output device 200 and the HDMI receiver 40 of the projection device 101.

[0035] In addition, the standby power control unit 11 has functional units of an EDID response unit 11a and an HDCP authentication unit 11b. As a result, the standby power control unit 11 of the projection device 101 executes not only 5V HIGH detection (S4) in the HDMI negotiation flow (Figure 4), but also HPD transmission (S10), EDID response (S13), and HDCP authentication (S18).

[0036] When the HDCP authentication (S18) is completed, the standby power control unit 11 sets the semiconductor switch 12 to the ON state. As a result, the main CPU 20, the projection unit 30, and the FAN 60 are activated, and the light source of the projection unit 30 lights up. Then, the main CPU 20 receives a video signal via the HDMI receiver 40. The main CPU 20 sends the received video signal to the projection unit 30 and projects it onto a projection target such as a screen.

[0037] As described above, according to the projection device 101, the standby power control unit 11 performs HDMI negotiation and sets the semiconductor switch 12 to the ON state after the negotiation is completed. In other words, when the video signal cannot be input, the semiconductor switch 12 is in the OFF state, and when the video signal can be input, the semiconductor switch 12 is in the ON state. Therefore, when carrying the portable projection device 101 in a bag, even if the power button is accidentally pressed by being pushed by something, as long as the connected video output device 200 is not driven, DC power is not output, so lighting due to an incorrect operation can be prevented. In addition, the control means prohibits the lighting of the projection light source when the battery power is connected as the power source for lighting the projection light source. Therefore, when the projection device 101 is connected to a commercial power supply as an AC power supply as the power source for lighting the projection light source, when the power button is pressed by a user operation, the light source lights up immediately. Thus, the user can use the projection device 101 without discomfort.

[0038] (Modification example) The present invention is not limited to the above-described embodiments, and various modifications such as the following are possible, for example. (1) The projection device 100 of the above embodiment used HDMI, but it can also use DP (Display Port (Registered trademark) ) or VGA (Video Graphics Array). Fig. 6 shows the pin assignment of the DP connector, and Fig. 7 shows the pin assignment of the VGA connector. However, VGA complies with the VESA (Video Electronics Standards Association) standard and uses the 9th pin as "DDC +5 volt load".

[0039] [Supplementary Note] <Claim 1> A projection device configured to be connectable to a commercial power supply as an AC power supply and a battery power supply as a DC power supply as a lighting power supply for a projection light source, a connector for connecting an external device, determination means for determining whether the voltage of the power pin of the connector is equal to or higher than a predetermined threshold value or whether a video signal is input from the connector when the battery power supply is connected and a user operation on an operation button for lighting the projection light source is received; control means for starting lighting of the projection light source when the voltage determined by the determination means is equal to or higher than the predetermined threshold value or when the video signal is input, and prohibiting lighting of the projection light source when the voltage determined by the determination means is less than the predetermined threshold value or when the video signal is not input; A projection device characterized by comprising the above. <Claim 2> The external device is a video output device, and a first switch (semiconductor switch) for supplying the DC power of the battery power supply to the projection unit. The control means is connected to the battery power supply, short - circuits the first switch at the timing indicating a change in the state of the second switch (mechanical switch), prohibits the short - circuit of the first switch when the voltage of the power pin of the connector cannot be detected, and permits the short - circuit of the first switch when the voltage of the power pin of the connector can be detected. The projection device according to claim 1, characterized in that. <Claim 3> The connector is an HDMI (registered trademark) connector or a DP connector. The output side of the first switch further comprises a second control unit. The determination means determines the connection with the video output device via the connector. The projection device according to claim 2, characterized in that. <Claim 4> The control means controls the projection light source after the determination means determines the completion of the connection with the external device. The projection device according to any one of claims 1 to 3, characterized in that. <Claim 5> The external device is a video output device. A first switch for supplying the DC power of the battery power supply to the projection unit. And. The control means is connected to the battery power supply, short - circuits the first switch at the timing when the second switch is short - circuited, prohibits the short - circuit of the first switch when a video signal cannot be input from the connector, and permits the short - circuit of the first switch when a video signal is being input from the connector. The projection device according to claim 2, characterized in that. <Claim 6> A connector for connecting an external control device. A first switch for supplying the DC power of the battery power supply to the drive circuit. Control means connected to the battery power supply, which prohibits the supply of the DC power when the voltage of the power pin of the connector cannot be detected. A power supply device, characterized by comprising. <Claim 7> A power control method executed by a control unit connected to a battery power supply of a power supply device including a connector for connecting an external control device and a power supply circuit for supplying DC power to a drive circuit, when the voltage of the power pin of the connector cannot be detected, prohibiting the supply of the DC power A power control method characterized by this. <Claim 8> A power control program to be executed by a control unit connected to a battery power supply of a power supply device including a connector for connecting an external control device and a power supply circuit for supplying DC power to a drive circuit, when the voltage of the power of the connector cannot be detected, prohibiting the supply of the DC power A power control program characterized by this.

Explanation of Signs

[0040] 10 Power supply device 11 Standby power control unit (control means, determination means) 12 Semiconductor switch (first switch) 13 Mechanical switch (mechanical switch) 20 Main CPU (control means) 30 Projection unit 40 HDMI receiver 50 Connector 100, 101 Projection device 150 HDMI cable 200 Video output device (external device)

Claims

1. A projection device configured to be connectable to a commercial power source as an AC power source and a battery power source as a DC power source as a power source for lighting a projection light source, A connector for connecting a video output device; a first switch that supplies DC power from the battery power source to a projection unit; a control means for determining whether the battery power source or the commercial power source is connected; a determination means for determining whether a voltage of a power supply pin of the connector is equal to or higher than a predetermined threshold value or whether a video signal is being input from the connector when it is determined that the battery power supply is connected and a user operation on an operation button for turning on the projection light source is received, The control means, when the determination means determines that the voltage of the power pin of the connector is equal to or higher than a predetermined threshold value or that a video signal is being input from the connector, shorts the first switch to start turning on the projection light source, and when it is determined that the commercial power source is connected and a user operation on the operation button is accepted, supplies power from the commercial power source to the projection unit to turn on the projection light source without determining whether or not the voltage of the power pin of the connector is equal to or higher than a predetermined threshold value or that a video signal is being input from the connector.

2. The control means does not short-circuit the first switch when the determination means determines that a voltage equal to or higher than the predetermined threshold cannot be detected at the power pin of the connector or that a video signal is not being input from the connector.

2. The projection device according to claim 1.

3. The connector is an HDMI (registered trademark) connector or a DP (registered trademark) connector. 、 The determining means determines a connection with the video output device via the connector.

3. The projection device according to claim 2.

4. A projection control method for a projection device that is configured to be connectable to a commercial power source as an AC power source and a battery power source as a DC power source as a power source for lighting a projection light source, comprising: determining whether the battery power source or the commercial power source is connected; when it is determined that the battery power source is connected and when a user operation is received on an operation button for turning on the projection light source, it is determined whether a voltage of a power pin of a connector for connecting a video output device is equal to or higher than a predetermined threshold value, or whether a video signal is being input from the connector; when it is determined that the voltage of the power pin of the connector is equal to or higher than a predetermined threshold value, or when a video signal is input from the connector, a first switch that supplies DC power from the battery power source to a projection unit is short-circuited to start lighting up the projection light source; A projection control method characterized in that, when it is determined that the commercial power source is connected and a user operation on the operation button is received, power from the commercial power source is supplied to the projection unit to turn on the projection light source without determining whether the voltage of the power pin of the connector is above a predetermined threshold value or whether a video signal is input from the connector.

5. A projection control program for a projection device configured to be connectable to a commercial power source as an AC power source and a battery power source as a DC power source as a power source for lighting a projection light source, determining whether the battery power source or the commercial power source is connected; when it is determined that the battery power source is connected and when a user operation is received on an operation button for turning on the projection light source, it is determined whether a voltage of a power pin of a connector for connecting a video output device is equal to or higher than a predetermined threshold value, or whether a video signal is being input from the connector; when it is determined that the voltage of the power pin of the connector is equal to or higher than a predetermined threshold value, or when a video signal is input from the connector, a first switch that supplies DC power from the battery power source to a projection unit is short-circuited to start lighting up the projection light source; A projection control program characterized by: when it is determined that the commercial power source is connected and a user operation on the operation button is received, supplying power from the commercial power source to the projection unit and turning on the projection light source without determining whether the voltage of the power pin of the connector is above a predetermined threshold value or whether a video signal is input from the connector.

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