JP2000330537A - Video display device and input switching method for the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video display device in which even an operator not grasping connection states can perform the smooth input switching operation of video signals by controlling this display device so that the operator does not perform a switching operation to video input terminals to which video signals are not supplied as destinations of the supply of the video signals. SOLUTION: A video signal detecting circuit 104 always detects whether video signals are individually supplied to all video input terminals 101A to 101C or not and outputs these detection results to a CPU part 108. Consequently, the part 108 can judge whether a video signal is supplied to one video input terminal by reading out detection results to be outputted from the circuit 104. Moreover, the part 108 makes a video signal switching circuit 105 so as not to perform swtichings to video input terminals to which video signals are not supplied as destinations of the supply of the video signals by automatically detecting the presence or absence of the video signals being supplied to the plural video signal inputting terminals 101A to 101C with the circuit 104.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention switches to a video input terminal among a plurality of video input terminals for inputting video signals, and displays an image of a video signal supplied from the one video input terminal on a screen. The present invention relates to an image display device that displays an image by enlarging and displaying the image and an input switching method of the image display device.

[0002]

2. Description of the Related Art FIG. 1 is a system configuration diagram showing an image projection system. The video projection system shown in FIG. 1 includes a projector device (video display device) 1 which is an object of the present invention,
It comprises a screen 2 and a video signal source 3.
The projector device 1 is a projector that inputs a video signal supplied from a video signal source 3, enlarges and projects an image of the video signal on a screen 2, and displays the image.

As shown in FIG. 1, the projector 1 is provided with a plurality of video input terminals 101 for inputting video signals supplied from a video signal source 3. The projector device 1 selects one of the plurality of video input terminals 101 and displays the video of the video signal supplied from the selected one of the video input terminals 101. In addition, the projector device 1 has one video input terminal 1 among the plurality of video input terminals 101 by the operator.
A main body key 102 and a remote controller 103 for performing a switching operation 01 and the like are provided.

[0004] The screen 2 displays an image enlarged and projected from the projector device 1. The video signal source 3 supplies a video signal to the projector device 1. The video signal source 3 is generally a computer or a video device.

Next, the switching operation of the video input terminal 101 of the projector 1 will be described. FIG. 5 is a flowchart for explaining a conventional video input terminal switching operation. First, the projector device 1 has a configuration in which one of the plurality of video input terminals 101 is selected, and a video signal supplied from the one video input terminal 101 is displayed on the screen 2. And

In this state, when the operator operates the main body key 102 or the remote controller 103 to execute the switching function of the video input terminal 101, as shown in FIG. 5, the projector device 1 is the next switching target. The video input terminal 101 (nextinput) is calculated (step ST1), and the supply destination of the video signal is immediately changed to the calculated video input terminal 101 (nextinput).
t) (step ST2).

Here, the switched video input terminal 10
When a video signal is supplied to the projector 1, the projector device 1 displays an image of the video signal on the screen 2. On the other hand, when no video signal is supplied to the switched video input terminal 101, the projector device 1
A no-input state is displayed in which nothing is displayed, and generally, the entire display area becomes black or blue.

The information as to which of the plurality of video input terminals 101 the video input terminal 101 has been switched to is retained even after the power of the projector device 1 is turned off.
And is reflected (last memory) at the next power-on. Therefore, when switching to the video input terminal 101 to which no video signal is supplied when the power is turned on, the projector device 1 enters the no-input state and displays black or blue.

[0009]

However, in the projector device (video display device) 1 as described above, if the operator does not know the connection status between the plurality of video input terminals 101 and the video signal source 3, The image intended by the operator cannot be immediately displayed on the screen 2, and in the worst case,
There is a possibility that the switching function of the video input terminals 101 must be executed while repeating the no-input state for all the video input terminals 101, and there is a problem that a smooth switching operation cannot be performed.

After the power of the projector device 1 is turned off, the connection state between the video input terminal 101 and the video signal source 3 is changed, and the video signal is supplied to the video input terminal 101 different from the last stored video input terminal 101. In such a case, when the power is turned on, the operator suddenly becomes in a no-input state, so that the operator becomes very uneasy, and in some cases, there is a problem that the operator mistakes the malfunction.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and is intended to provide a video system capable of performing a smooth video signal input switching operation even by an operator who does not know the connection status. It is an object of the present invention to obtain a method for switching an input between a display device and a video display device.

Further, according to the present invention, when a power supply is turned on and a video signal is supplied to at least one video input terminal, a video is always displayed, and an operator's anxiety can be eliminated. It is an object of the present invention to obtain an input switching method for a device and a video display device.

[0013]

According to a first aspect of the present invention, there is provided a video display apparatus comprising: a plurality of video input terminals for inputting a video signal supplied from a video signal source; A video signal switching unit that selects and outputs one video signal from a plurality of video signals, and a video signal that constantly detects presence / absence of a plurality of video signals supplied from a plurality of video input terminals for each of the plurality of video input terminals A detection unit, a video display unit that displays an image of one video signal output from the video signal switching unit on a screen, and a video signal switching unit that supplies a video signal based on a detection result of the video signal detection unit. And a control unit that controls not to switch to a video input terminal that is not supplied as a video signal supply destination.

According to a second aspect of the present invention, there is provided an input switching method for a video display device, wherein a video signal detection unit detects presence or absence of a plurality of video signals supplied to a plurality of video input terminals, and determines a detection result. Based on this, the video signal switching unit does not switch to the video input terminal to which the video signal is not supplied as the video signal supply destination.

According to a third aspect of the present invention, in the input switching method of the video display device, even when the power is turned on, the video signal switching unit does not supply the video signal based on the detection result of the video signal detecting unit. In this configuration, the video input terminal is not switched as a video signal supply destination.

According to a fourth aspect of the present invention, there is provided an input switching method for a video display device, wherein a video signal switching unit does not switch a video input terminal to which a video signal is not supplied as a video signal supply destination, Alternatively, it is possible to select either one of switching as a video signal supply destination to a video input terminal to which no video signal is supplied.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 2 is a block diagram showing a configuration of the projector device (video display device) according to Embodiment 1 of the present invention. In FIG. 2, a plurality of video input terminals 101
A to 101C are terminals that are connected to the video output terminal 301 of the video signal source 3 and that input a video signal supplied from the video signal source 3. In FIG. 2, for simplicity, only the video input terminal 101B is connected to the video output terminal 301 of the video signal source 3.
And the video input terminals 101A and 101C
Although the video output terminal 301 is not connected, the video signal source 3
Is prepared as a connection destination when there are a plurality of.

Video signal detection circuit (video signal detection unit) 10
4 indicates the presence or absence of a video signal supplied from the plurality of video input terminals 101A to 101C,
It is always detected every 101 C. The video signal switching circuit (video signal switching unit) 105 is a circuit that selects and outputs one video signal from a plurality of video signals supplied from the plurality of video input terminals 101A to 101C. The display signal generation unit 106 generates a display signal that can be displayed and output as video based on one video signal output from the video signal switching circuit 105.

The video display unit 107 includes a display signal generation unit 10
The display signal output from the display unit 6 is enlarged and projected on the screen 2 and displayed. The video display unit 107 generally includes a display device, an optical lens, a light source lamp, and the like. Display devices include liquid crystal and DL
A device such as P is used, and the image of the display device is enlarged and projected on the screen 2 and displayed.

The CPU unit (control unit) 108 incorporates program data, and according to the program data,
The control of all the circuits of the projector 1 is performed via the control bus 109 and the data bus 110.

The main body key 102 is used by the operator to perform operations such as switching of the video input terminals 101A to 101C.
2 is input into the projector device 1. The remote controller 103 is for performing remote operations such as switching of the video input terminals 101A to 101C by an operator. The remote controller receiving circuit 112 receives the code data transmitted from the remote controller 103 and Is to be entered. It should be noted that the projector device 1 is
A plurality of buttons are provided so that various functions can be operated.

As described with reference to FIG. 1, the screen 2 displays an image enlarged and projected from the image display unit 107 of the projector device 1. Video signal source 3
Supplies a video signal to the projector device 1 and is generally a computer, a video device, or the like.

Next, the operation of the projector 1 will be described. First, the operation of the projector device 1 for displaying an image will be described. The operator operates the video output terminal 301 of the video signal source 3 and the video input terminal 1 of the projector 1.
01A to 101C (only the video input terminal 101B in FIG. 2) is connected, and the video signal from the video signal source 3 is supplied into the projector device 1.

The video signal supplied from the video signal source 3 is
The video signal is output to the video signal switching circuit 105 via the video input terminal 101 of the projector device 1. The video signal switching circuit 105 selects one of the video signals supplied from the plurality of video input terminals 101A to 101C and outputs it to the display signal generation unit 106 according to an instruction from the CPU unit 108 (that is, the video signal switching). The circuit 105 includes the display signal generation unit 1
06 can be switched.

The display signal generation section 106 generates a display signal that can be displayed and output as an image based on the image signal output from the image signal switching circuit 105 and outputs the display signal to the image display section 107. The video display unit 107 enlarges and displays the display signal output from the display signal generation unit 106 on the screen 2 for display.

Next, the switching operation of the video input terminals 101A to 101C of the projector 1 will be described. As described above, in the projector device 1, one of the plurality of video input terminals 101A to 101C is selected, and the video signal supplied from the one video input terminal is displayed on the screen 2. Shall be. In this state, the operator operates the main body key 102 or the remote control 1
By operating the button 03, the image display is switched.

When the operator operates the body key 102, the body key 102 generates code data assigned to the button in accordance with the button operated by the operator. The key input circuit 111 transmits the code data generated by the main body key 102 to the CPU unit 108 via the data bus 110. When the operator remotely operates the remote controller 103, the remote controller 103 transmits code data that changes according to the button operated by the operator.
Remote control receiving circuit 112 receives the code data transmitted from remote control 103 and transmits the code data to CPU 108 via data bus 110. The CPU unit 108 determines the code data transmitted from the key input circuit 111 or the remote control receiving circuit 112, and executes the function assigned to the code data.

Here, the main body key 102 and the remote controller 1
03 has an input switching button (not shown) for switching the video input terminals 101A to 101C to which the video signal is supplied, in addition to other buttons. The operator switches the video displayed on the screen 2 by operating the input switching button. Video input terminal 1
The switching operation of 01A to 101C is performed when the supply destination of the displayed video signal is “video input terminal 101B” to “video input terminal 101B”, and when the “video input terminal 101B” is “video input terminal 101C”, "Video input terminal 101
C "to" video input terminal 101A ",
It switches relatively.

FIG. 3 is a flowchart for explaining the switching operation of the video input terminal of the projector device (video display device) according to the first embodiment of the present invention. When receiving the code data from the input switch button of the main body key 102 or the remote control 103, the CPU unit 108 determines the next based on the currently selected video input terminal (the current video signal supply destination video input terminal). One video input terminal (nextinput) to be switched to is calculated relatively (step ST1).

For example, if the supply destination of the currently selected video signal is "video input terminal 101B", it is set to "video input terminal 101C" and "video input terminal 1B".
01C ", the" video input terminal 101 "
For example, "A" is calculated relatively so as to follow the switching order.

When the next video input terminal (nextinput) to be switched is calculated, the CPU unit 108 switches the one video input terminal (nextinput) before switching the one video input terminal (nextinput). (Next
It is determined whether a video signal is actually supplied to (input) (step ST3).

The video signal detection circuit 104 always detects whether or not video signals are individually supplied to all the video input terminals 101A to 101C, and outputs the detection result to the CPU unit 108. I have. Therefore, the CPU unit 1
08 reads out the detection result output from the video signal detection circuit 104, thereby detecting one video input terminal (nex).
(input) can be determined whether or not a video signal is supplied.

If the result of the determination in step 3 is that the video signal is actually supplied to one video input terminal (nextinput), the CPU section 108 changes the supply destination of the video signal to the one video input terminal (next input). (nextinput) (step ST2). On the other hand, the CPU unit 108
If no video signal is actually supplied to one video input terminal (nextinput), it is determined whether or not the determination in step ST3 has been performed for all video input terminals 101A to 101C (step ST4).

When the CPU unit 108 determines that all the video input terminals 101A to 101C have not performed the determination in step ST3 as a result of the determination in step ST4, the process returns to step ST1 and returns to step ST1. As described above, one video input terminal (ne
xinput) is relatively calculated, and it is determined whether or not a video signal is supplied to one of the video input terminals (step ST3). On the other hand, the CPU unit 108 applies the above-described step ST to all the video input terminals 101A to 101C.
If it is determined that the determination of No. 3 has been performed, it is determined that all the video input terminals 101A to 101C are in the no-input state, and an error message is displayed on the display area of the projector device 1 so that the operator can recognize it. (Step ST5), the input switching process ends.

As described above, in step ST3, one video input terminal (nexti) to be switched next.
nput), when the video signal is not actually supplied, the process returns to step ST1 without switching to the one video input terminal (without shifting to step ST2) and returns to the next switch. One video input terminal (n
(extinput) is relatively calculated, so that the operator can operate the main body key 102 or the remote controller 10.
By operating the input switching button 3, it is possible to sequentially switch only the video input terminals 101A to 101C to which the video signals are supplied.

Further, a plurality of video input terminals 101A to 101A
The information as to which video input terminal has been switched in 1C is stored by the CPU unit 108 as needed, and is stored (last memory) even when the power supply of the projector device 1 is cut off. When the power of the projector device 1 is turned on, the CPU unit 108 switches to the stored one video input terminal to perform video display.
In step ST3, it is determined whether a video signal is supplied to one video input terminal (nextinput) to be switched next.

As a result of the determination in step ST3, the CPU unit 108 stores the stored one video input terminal (nextin
If a video signal is supplied to (put), the video signal is displayed as usual, while if no video signal is supplied to one stored video input terminal (nextinput), another video signal is displayed. The video signal supplied to the input terminal can be displayed.

As described above, according to the first embodiment, a plurality of video input terminals 1
The presence / absence of a video signal supplied to 01A to 101C is automatically detected, and the video signal switching circuit 105 cannot switch to a video input terminal to which no video signal is supplied as a video signal supply destination. With this configuration, even an operator who does not know the connection status can perform a smooth video signal input switching operation.

If the video signal is not supplied to one of the stored video input terminals (last memory) when the power is turned on, the video input terminal to which the video signal is supplied is selected from the other video input terminals. Is detected, and the video input terminal is automatically switched as a video signal supply destination.When the power is turned on, if at least one video input terminal is supplied with a video signal, The video is displayed, and the operator does not have to be uneasy.

Embodiment 2 In the first embodiment, when the operator operates the input switch button of the main body key 102 or the remote control 103, in step ST1, one of the video input terminals (next inp.
ut) is relatively calculated, but the present invention is not limited to this. By operating a button for specifying one of the video input terminals 101A to 101C of the main body key 102 or the remote control 103, a specific video input terminal (Nexti
nput) may be specified for switching.

In this case, if the result of determination in step ST3 of FIG. 3 is that a video signal is not supplied to a specific video input terminal (nextinput), the CPU unit 108 immediately makes no determination in step ST4 and immediately executes The error message of step ST5 will be displayed. According to the second embodiment as well, as in the first embodiment, at the time of turning on the power, if a video signal is supplied to at least one video input terminal, the video is displayed. be able to.

Embodiment 3 Both the input switching method according to the first embodiment and the conventional input switching method can be provided. FIG. 4 is a flowchart for explaining such a switching operation of the video input terminal of the projector device (video display device) according to the third embodiment of the present invention. Note that the configuration of the projector device 1 is the same as that shown in FIG.

Whether the input switching method according to the first embodiment or the conventional input switching method is used is determined by preparing a hardware switch or a software switch (not shown) of the projector 1 and When the operator selects the switch, the flow of the control process of the CPU unit 108 is switched in step ST6. That is, one video input terminal (nextinpu)
After the processing in step ST1 for calculating t), in step ST6, if the input switching method according to the first embodiment for determining the supply of the video signal is selected, the process proceeds to step ST3, while the video signal is determined. If the conventional input switching method that does not perform the supply discrimination is selected, step S
It shifted to T2.

As described above, according to the third embodiment,
By providing both the input switching method according to the first embodiment and the conventional input switching method, for example, if the number of video input terminals is large, the input switching method according to the first embodiment can be adopted. If the number is smaller, the input switching method can be changed according to the connection status between the projector device 1 and the video signal source 3 or the usage status of the projector device 1, such as by adopting a conventional input switching method. Operability can be further improved.

[0045]

As described above, according to the first aspect of the present invention, a plurality of video input terminals for inputting a video signal supplied from a video signal source and a plurality of video input terminals supplied from a plurality of video input terminals are provided. A video signal switching unit that selects and outputs one video signal from video signals, and a video signal detection unit that constantly detects the presence or absence of a plurality of video signals supplied from a plurality of video input terminals for each of the plurality of video input terminals And a video display unit that displays an image of one video signal output from the video signal switching unit on a screen, and based on a detection result of the video signal detection unit, no video signal is supplied by the video signal switching unit. The control unit controls the video input terminal so that it does not switch as the video signal supply destination, so even operators who do not know the connection status can smoothly switch the input of video signals. There is an effect that it is possible.

According to the second aspect of the present invention, the presence / absence of a plurality of video signals supplied to the plurality of video input terminals is detected by the video signal detection unit, and based on the detection result, the video signal switching unit is provided. As described above, the switching of the video signal input terminal to which the video signal is not supplied is not switched as the video signal supply destination. There is an effect that a smooth video signal input switching operation can be performed.

According to the third aspect of the present invention, even when the power is turned on, based on the detection result of the video signal detection unit, the video signal switching unit supplies the video signal to the video input terminal to which no video signal is supplied. Since it is not switched as the signal supply destination, when the power is turned on, if the video signal is supplied to at least one video input terminal, the video is always displayed, and the operator may be uneasy. This has the effect of disappearing.

According to the fourth aspect of the present invention, the video signal switching unit does not switch to the video input terminal to which the video signal is not supplied as the video signal supply destination, or the video signal is supplied. It is possible to select either one of the video input terminals to be switched as the video signal supply destination even if there is no video input terminal. The input switching method can be changed, and the operability by the operator can be further improved.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing a video projection system.

FIG. 2 is a block diagram showing a configuration of a video display device according to Embodiment 1 of the present invention.

FIG. 3 is a flowchart for explaining a switching operation of a video input terminal of the video display device according to the first embodiment of the present invention.

FIG. 4 is a flowchart for explaining a switching operation of a video input terminal of a video display device according to a third embodiment of the present invention.

FIG. 5 is a flowchart for explaining a conventional video input terminal switching operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Projector apparatus (video display apparatus) 2 Screen 3 Video signal source 101A-101C Video input terminal 104 Video signal detection circuit (video signal detection section) 105 Video signal switching circuit (video signal switching section) 107 Video display section 108 CPU section ( Control section)

Claims (4)

[Claims] 1. A plurality of video input terminals for inputting a video signal supplied from a video signal source, and a video for selecting and outputting one video signal from the plurality of video signals supplied from the plurality of video input terminals. A signal switching unit, a video signal detection unit that constantly detects the presence or absence of the plurality of video signals supplied from the plurality of video input terminals, for each of the plurality of video input terminals, and a signal output from the video signal switching unit. An image display unit that displays an image of the one image signal on a screen, and, based on a detection result of the image signal detection unit, the image input terminal to which the image signal is not supplied by the image signal switching unit. And a control unit for controlling not to switch as a supply destination of the video signal. 2. A video signal switching unit selects one video signal from a plurality of video signals supplied to a plurality of video input terminals, and displays an image of the selected video signal on a screen by a video display unit. In the input switching method of the video display device, the presence or absence of the plurality of video signals supplied to the plurality of video input terminals is detected by a video signal detection unit, and based on the detection result, the video signal switching unit Wherein the video signal input terminal to which the video signal is not supplied is not switched as a supply destination of the video signal. 3. A video signal switching unit does not switch to a video input terminal to which a video signal is not supplied as a supply destination of the video signal based on a detection result of the video signal detection unit even when the power is turned on. 3. The input switching method for a video display device according to claim 2, wherein: 4. A video signal switching unit does not switch a video input terminal to which a video signal is not supplied as a supply destination of the video signal, or a video signal to a video input terminal to which the video signal is not supplied. 4. The input switching method for a video display device according to claim 2, wherein any one of switching as a supply destination of the video signal can be selected.