JP4791736B2 - Portable video signal processing apparatus and external unit connection control method thereof - Google Patents

Description

  The present invention relates to a portable video display device and its external unit connection control method, and is effective when applied to, for example, a DVD (Digital Versatile Disk) player, a PDA (Personal Digital Assistance), or a personal computer. .

A technology that enables a tuner to be connected to a personal computer has been developed (see, for example, Patent Document 1). Thereby, the television program can be viewed on the display screen of the personal computer.
JP-A-7-154274

  By the way, in a portable electronic device such as a personal computer, a battery is used as a power source. In recent years, DVD players have also been developed and portable products have been sold. A battery is also used in this DVD player. There is a desire to connect a tuner to this DVD player and watch a TV program.

  However, when a tuner can be connected to a portable electronic device such as a DVD player, it is necessary to supply power to both. For this reason, when the batteries can be stored in both, the battery management is complicated and inconvenient.

  Therefore, in the present invention, the battery of the portable electronic device can be supplied also to, for example, a tuner as an external unit, and in this case, a device that can reduce the power consumption is provided, and the convenience and low consumption of the battery are provided. It is an object of the present invention to provide a portable video display device that can obtain power.

In an embodiment according to the present invention, an electronic device having a power supply unit, an external signal input terminal as an external video / audio input terminal provided in the electronic device, a power output terminal, and a tuner to the external signal input terminal A power output control unit that supplies power from the power supply unit to the power output terminal when signal input from the power source is permitted, and the power output control unit supplies power to the tuner from the power output terminal Before starting, the power is output only when it is determined that the connector is inserted into both the external video / audio input terminal and the power output terminal.

  By the above means, the power supply for supplying to the external device (for example, the tuner) is only necessary, and the power consumption is reduced and the power supply unit is only provided in the electronic device, so that the battery can be easily managed. .

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows, for example, a portable DVD player 100 to which the present invention is applied. A tuner 10 can be connected to the portable DVD player 100.

  In the figure, the relationship between the portable DVD player 100 and the tuner 10 is shown and described. However, the technical idea of the present invention is not limited to the relationship between the portable DVD player 100 and the tuner 10, and generally displays images. If there is a relationship between a portable electronic device (video display device) to be connected and a unit that requires a power source connected to the electronic device, it is applicable.

  The portable DVD player 100 displays video on the display unit 2 during DVD playback, and outputs sound from the speaker 5. The portable DVD player 100 has a video / audio input terminal 3 and a power supply terminal 4 as shown in FIG. Reference numeral 6 denotes a video signal output terminal, and reference numeral 7 denotes a main body power switch. A video / audio signal input from the outside via the video / audio input terminal 3 can be reproduced and output to the display unit 2 and the speaker 5. Whether the portable DVD player 100 plays a DVD or takes an external input signal and reproduces video / audio from the external input on the portable DVD player 100 is controlled by the mode of the portable DVD player 100.

  The cable 13 is a line that guides a video / audio signal from the external unit (for example, tuner) 10 to the portable DVD player 100. The cable 14 is a line for supplying power from the portable DVD player 100 to the external unit (for example, tuner) 10.

  Now, the case where the external unit 10 is a TV tuner will be described. An RF reception signal from the antenna 11 is input to the TV tuner 10 via the antenna cable 12. The TV tuner 10 demodulates the RF signal and outputs video and audio baseband signals. The video / audio output signal is input to the portable DVD player 100 via the cable 13 and reproduced and output to the display unit 2 and the speaker 5. The portable DVD player 100 is shown as a representative and may be a portable information device such as a PDA. The tuner 10 may be provided with a power switch 10A.

  FIG. 3 shows functional blocks inside the portable DVD player 100. Reference numeral 20 denotes a DVD playback apparatus, which includes an optical head and decoder unit, a disk loading unit, a disk rotation control unit, and the like. A signal read from the disc and reproduced is supplied to one input unit of the mode switching unit 21. The video signal selected by the mode switching unit 21 is supplied to the display unit 2, and the audio signal is supplied to the speaker 5.

  The video / audio input terminal 3 is connected to the other input section of the mode switching section 21. Accordingly, the mode switching unit 21 can supply an external video / audio signal to the display unit 2 and the speaker 5, respectively. Reference numeral 22 denotes a power supply unit. A battery can be loaded here. The power output terminal of the power supply unit 22 is connected to each functional block unit inside the apparatus (not shown in the figure). As a special path, the power supply terminal of the power supply unit 22 is connected to the power supply terminal 4 via a switch (not shown) that can be controlled on and off. Whether to supply power to the power supply terminal 4 is determined by a control signal from the control unit 23.

  The control unit 23 includes a mode control processing unit 24 and a connector insertion detection processing unit 25. The mode control processing unit 24 sets the operation state of the device according to the operation signal from the operation unit 26 and the state detection signal inside the device. The operation at this time will be described later with reference to the flowchart of FIG.

  Further, a video / audio connector insertion detection unit 16 and a power connector insertion detection unit 15 are provided. The video / audio connector insertion detection unit 16 and the power connector insertion detection unit 15 detect that the cables 13 and 14 are inserted into both the video / audio input terminal 3 and the power supply terminal 4 connectors. The detected video / audio connector detection signal 18 and power connector detection signal 17 are input to the control unit (CPU) 23. The mode control processing unit 24 controls the mode control signal 27 in response to the output of the connector insertion detection processing unit 25 that has received the connector detection signal. The operation at this time will be described with reference to the flowchart of FIG.

  The mode switching unit 21 is controlled by a mode control signal 27 from a mode control processing unit 24 that receives a signal from the operation unit 26. At the same time, the mode control signal 27 controls the power supply from the power supply unit 22 to the power supply terminal 4.

  In the above system, the TV tuner 10 does not need to supply power directly to the TV tuner 10 by receiving power supply from the power supply terminal 4 of the portable DVD player 100. For this reason, it becomes easy to carry together the portable DVD player 100 and the TV tuner 10 which are operating with a battery.

  In the present invention, power is supplied to the power supply terminal 4 only when the portable DVD player is in a mode of reproducing external input. It is not necessary to operate the external unit 10 during DVD reproduction, and thus it is not necessary to supply power to the power supply terminal 4. As a result, power consumption can be reduced.

  In addition, when the TV tuner 10 is not normally connected, no voltage appears at the power supply terminal 4. For this reason, it is prevented that an unnecessary conductor contacts the power supply terminal 4 to cause an accident, and the safety of the product is ensured.

  Although the external unit has been described as the TV tuner 10 here, the present invention is not limited to this. For example, if a radio receiver or the like outputs video and audio, the same effect can be obtained. The external video / audio input terminal 3 can transmit video and audio with one connector. However, the video / audio input terminal 3 is not limited to this. Even if it is the structure which can be connected by the same connector, the same effect can be acquired. Furthermore, a connection terminal using a USB (Universal Serial Bus) may be used.

  In the above-described embodiment, the power supply unit 22 is described as a battery (battery). However, a power supply device using an AC adapter or the like may be used.

  FIG. 4 is a flowchart showing an example of the operation of this apparatus centering on the control unit 23. Assume that connections as shown in FIG. 1 are made. First, in step S31, the portable DVD player is turned on. In step S32, the mode of the portable DVD player is determined. If it is the external input mode, the process proceeds to Step S33, and if it is any other mode, the process proceeds to Step S37 (no power supply to the power supply terminal 4).

  In step S33, power is supplied to the external power supply terminal 4. Then, in the next step S34, the external unit (TV tuner) 10 starts to operate, and the video / audio output of the TV tuner is reproduced on the portable DVD player by the video / audio display in step S35.

  On the other hand, if the determination result in step S32 is other than the external input mode, the process proceeds to step S37, and the power supply terminal 4 is not supplied with power. Therefore, in the next step S38, the external unit 10 does not operate, and power consumption can be reduced.

  FIG. 5 is a flowchart showing another operation example of the apparatus according to the present invention. Here, it is assumed that the connection as shown in FIG. 1 is made. The difference from the flowchart of FIG. 4 is that step S40 is included between step S32 and step S33. If the determination result in step S32 is the external input mode, it is detected in step S40 that the cables 13 and 14 are inserted into both the video / audio input terminal 3 and the power supply terminal 4 connectors. Only when both are inserted, power is supplied to the power supply terminal 4 in step S34 in order to operate the external unit 10. If only one of them is inserted, the process proceeds to step S37 and no power is supplied. As a result, it is possible to prevent accidental use of the power supply terminal in the external input mode.

  That is, whether or not the connection cable or the connection terminal is used in the correct state is detected, and power supply and signal capture are executed only when the connection cable or the connection terminal is used in the correct state.

  As described above, in the setting of the operation function shown in FIG. 4, when the video / audio signal from the external unit is not displayed, power is not supplied to the external power supply terminal, so that power consumption can be reduced. Further, in the setting of the operation function shown in FIG. 5, since the power is supplied only when the external unit actually operates, the safety can be improved by preventing misuse.

  As described above, the present invention also has a feature as a connection control method for an external unit. That is, it is a connection control method for controlling the electronic device so that the external unit is electrically connected to the electronic device having the internal power supply unit via a cable. Here, only when the first step of turning on the power switch of the internal power supply unit and the mode specification for using the external unit are specified, the internal power supply unit is connected to the power supply terminal to which the power cable of the external unit is connected. A second step of deriving and supplying the power output to the external unit.

  The second step includes a step of ticking whether a necessary cable between the external unit and the electronic device is connected when a mode specification using the external unit is specified, and the necessary cable is connected. Only when it is detected that the power supply is detected, the power supply output of the internal power supply unit is derived to the power supply terminal.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

It is the schematic which shows one Embodiment of the portable video signal processing apparatus concerning this invention. It is explanatory drawing which shows the side surface of the apparatus shown in FIG. It is a figure which shows the function block inside the apparatus shown in FIG. It is the flowchart shown in order to demonstrate the operation example of the apparatus which concerns on this invention. It is the flowchart shown in order to demonstrate the other operation example of the apparatus which concerns on this invention.

Explanation of symbols

2 ... Display unit, 3 ... External video / audio input terminal, 4 ... Power supply terminal, 5 ... Speaker, 10 ... External unit (TV tuner), 11 ... Antenna, 12 ... Antenna cable, 14 ... Power cable, 13 ... Video / Audio cable, 15 ... Power connector insertion detection unit, 16 ... Video / audio connector insertion detection unit, 17 ... Power connector detection signal, 18 ... Video / audio connector detection signal, 20 ... Playback device, 21 ... Mode switching unit, 22 ... Power supply unit, 23 ... control unit (CPU), 24 ... mode control processing unit, 25 ... connector insertion detection processing unit, 26 ... operation unit, 27 ... mode control signal.

Claims (2)

An electronic device having a power supply unit;
External signal input terminal as an external video / audio input terminal provided in this electronic device, and a power output terminal,
A power output control unit for supplying power from the power supply unit to the power output terminal when allowing signal input from a tuner to the external signal input terminal;
The power output control unit supplies power only when it is determined that a connector is inserted into both the external video / audio input terminal and the power output terminal before supplying power to the tuner from the power output terminal. portable video signal processing apparatus and outputting a.
In the connection control method for controlling the electronic device such that an external tuner is electrically connected to the electronic device having the internal power supply unit via a cable,
A first step of turning on a power switch of the internal power supply unit;
A second step of supplying the power of the internal power supply unit to the tuner via a power output terminal to which a power cable of the tuner is connected when a mode using the tuner is designated;
In the second step, when the mode for using the tuner is specified , a cable is connected to both the external video / audio input terminal and the power output terminal when the electronic apparatus is connected to the tuner. A power output from the internal power supply unit is performed on the power output terminal only when it is detected that a cable is connected to both. External unit connection control method.

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