JP2005333195A - Video display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display apparatus which is low in price and can easily be controlled by using an insertion detection means for detecting the connection of a connection connector of external equipment. <P>SOLUTION: The video display apparatus is characterized in to include: a plurality of external signal input terminals 1 to 3 for receiving external signals; insertion detection means 6 to 8 for detecting that connection connectors of external equipment are connected to the external signal input terminals 1 to 3; an input selection means 5 for selecting one signal among a plurality of input signals from the external signal input terminals 1 to 3 and output signals from a tuner and providing an output of the selected signal; an input switching control means 9 for giving an input switching instruction to the input selection means 5 to switch the input signal on the basis of external device insertion detection information from the insertion detection means 6 to 8; and a video display means 10 for displaying a video signal outputted from the input selection means 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a video display device including a video signal input switching device that automatically switches a video displayed on a screen in conjunction with connection of an external device.

  In a video display device, when a video from a tuner is displayed, or when a video from an external device is being displayed, an external device such as a game machine is newly connected and the video is displayed. You must press the input selector button on the control panel several times.

On the other hand, Patent Document 1 discloses an apparatus that automatically switches a video displayed on a screen when a signal is received as an external input. This video signal input switching device is provided with synchronization signal detection means for detecting that a signal has been input to each external signal input terminal, and a signal to be output to the input selection means based on synchronization detection information from each synchronization signal detection means And a video signal output from the input selection means is displayed (see Patent Document 1).
Japanese Patent Laid-Open No. 9-83881

  However, since the conventional video signal input switching device requires a synchronization detection means for detecting the synchronization signal of the video signal at each of the plurality of external input terminals, it becomes an expensive structure and controls each synchronization detection means. The above control means is also required, and the control of the entire system is complicated.

  An object of the present invention is to solve such problems and to provide an inexpensive and easy control by using an insertion detecting means for detecting that a connection connector of an external device is connected. To do.

  In order to solve the above problems, the present invention provides a plurality of external signal input terminals for inputting external signals, an insertion detecting means for detecting that a connection connector of an external device is connected to the external signal input terminals, Input selection means for selecting and outputting one signal from a plurality of input signals from the signal input terminal and an output signal from the tuner, and input to the input selection means based on external device insertion detection information from the insertion detection means Input switching control means for issuing a switching instruction and switching an input signal, and video display means for displaying a video signal output from the input selection means are provided.

  Further, the input switching control means instructs the input selection means to select the detected external input when it is detected that the insertion detection information from each of the plurality of insertion detection means has changed from being absent to being present. It is composed.

  With the above configuration, the synchronization signal detection means for detecting the synchronization signal of the video signal is not required for each of the plurality of external signal input terminals, and the input signal can be switched based on the information of the insertion detection means. In addition, when it is detected that the insertion detection information from the insertion detection means has changed from “no” to “present”, an instruction to select the detected external input is given to the external signal input terminal to each external signal input terminal. It is possible to detect that the device is connected and switch the input signal.

  Hereinafter, an image display apparatus according to an embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a block diagram of a video display device provided with a video signal input switching device according to an embodiment of the present invention. In FIG. 1, 1, 2 and 3 are external signal input terminals for inputting video signals from the outside, 4 is a tuning means for receiving and outputting on-air signals such as analog terrestrial broadcast, analog BS broadcast, digital terrestrial broadcast, Reference numeral 5 denotes input selection means for selecting and outputting one video signal from the video signals input from the plurality of external signal input terminals 1 to 3 and the video signal input from the tuning means 4. .

  6, 7 and 8 are insertion detecting means for detecting that the connectors of the external devices are connected to the respective external signal input terminals 1 to 3, and 9 is an input switching control means for inserting from the insertion detecting means 6 to 8. Based on the detection information, an instruction to switch the video signal to be output to the input selection means 5 is issued. Reference numeral 10 denotes video display means for displaying a video signal output from the input selection means 5.

  In the video signal input switching device configured as described above, for example, when the video signal of the tuning means 4 is selected and displayed on the video display means 10, the connector of the external device is connected to the external signal input terminal 1. The external device connection information of the insertion detection means 6 changes from “no connection” to “present”. The input switching control means 9 always monitors that the insertion detection information of each insertion detection means 6, 7, 8 changes from “no connection” to “present”. In this case, the detection information of the insertion detection means 6 Since it is detected that “not connected” is changed to “present”, a selection instruction is issued to the input selecting means 5 so as to select the video signal of the external signal input terminal 1. The input selection means 5 selects and outputs the input of the external signal input terminal 1 according to the control instruction of the input switching control means 9. Thereby, the video display means 10 displays the video signal of the external signal input terminal 1 output from the input selection means 5.

  As described above, according to the present invention, the synchronization detection means for detecting the synchronization signal of the video signal is not required for each of the plurality of external input terminals, so that it can be configured at low cost and each synchronization detection means is controlled. Since the control means for doing so is not necessary, the entire system can be easily controlled.

  As described above, according to the present invention, when an external device is connected to an external input terminal other than the above while displaying an image of a tuner or an external input terminal, the image of the device connected to the external input is displayed with a simple configuration. Thus, the present invention is useful in a video display device having a plurality of external signal input terminals.

The block diagram of the video display apparatus provided with the video signal input switching apparatus by one embodiment of this invention

Explanation of symbols

1, 2, 3 External signal input terminal 4 Tuning means 5 Input selection means 6, 7, 8 Insertion detection means 9 Input switching control means 10 Video display means

Claims (2)

A plurality of external signal input terminals for inputting external signals, an insertion detecting means for detecting that a connection connector of an external device is connected to the external signal input terminals, a plurality of input signals and tuners from the external signal input terminals An input selection means for selecting and outputting one signal from the output signals from the input, and an input switching control for switching the input signal by issuing an input switching instruction to the input selection means based on the external device insertion detection information from the insertion detection means And a video display means for displaying the video signal output from the input selection means. The input switching control means is configured to issue an instruction to select the detected external input to the input selection means when it is detected that the insertion detection information from each of the plurality of insertion detection means has changed from none to yes. The video display device according to claim 1.

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