JP2000032367A - Multi-channel divided picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-channel divided picture display device capable of highly accurately and easily performing control without providing any control circuit for controlling and setting display characteristics as many as the number of channels. SOLUTION: The input video signals of plural channels are selected by a video signal changeover SW 2, stored in a memory 6, reconstructed into multiple picture divided video and displayed on a CRT 9 or the like. In this case, by setting the display characteristics to the respective channels of divided video signals before being stored in the memory 6, video display is enabled while changing setting corresponding to the input channel. When there is a difference in the display characteristics for each channel, the display characteristics are corrected for each channel or accented so as to be easy to watch. The circuit configuration is simplified and setting operation is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a multi-channel split screen display device having an image quality adjusting function.

[0002]

2. Description of the Related Art Conventionally, when a plurality of channels are divided and displayed on one screen, there is a case where the sense of contrast or sharpness of a specific channel is different due to a difference in conditions of an input video signal, and it is difficult to view. In addition, differences in image quality such as color adjustment also cause discomfort when compared at a short distance.
In the related art, a control circuit for each channel is provided for this measure.

[0003]

However, in the above-mentioned prior art, in such a multi-channel split screen display, variation in contrast or sharpness for each channel is not preferable. Further, when a contrast or sharpness control circuit is added to the input stage of each channel, circuits for the number of channels are required, and the cost is increased.

The present invention solves such a conventional problem. A multi-channel divided screen which can be easily adjusted with high accuracy without a control circuit for adjusting and setting the display characteristics for the number of channels is provided. It is an object to provide a display device.

[0005]

The present invention adopts the following constitution in order to solve the above problems.

In the multi-channel split screen display device of the present invention, the video input unit inputs a plurality of video signals to each of the video signals, the video signal switch selects the video signals, and the selected video signal is converted by the AD converter. The digitalized video signal is stored in the memory. Further, the DA converter converts the digitized video signal into an analog signal, the display characteristic control circuit changes the display characteristics of the digitized video signal, and outputs the analogized video signal from the video output unit. With this configuration, it is possible to independently change the display characteristics of the video signal of an arbitrary channel and display the video signals of a plurality of channels in a divided manner.

[0007]

1 is a block diagram showing a configuration of a multi-channel split screen display device according to a first embodiment of the present invention; An AD converter for digitizing the selected video signal; a memory for storing the digitized video signal; a DA converter for converting the digitized video signal to analog; Equipped with a display characteristic control circuit that changes display characteristics, a video output unit that outputs analog video signals, and a microcomputer that controls the operation of each unit, and independently changes the display characteristics of video signals of any channel. The video signal of a plurality of channels can be divided and displayed.

With this configuration, it is possible to set the display characteristics for each channel according to the setting data performed on the screen without providing a display characteristic control circuit for changing the display characteristics for the number of channels.

The display characteristics of the multi-channel split screen display device according to the second aspect of the present invention may be display characteristics including at least one of contrast, sharpness, and image quality.

According to a third aspect of the present invention, the multi-channel split screen display device further includes a set amount display means for monitoring a set amount for changing the display characteristics by the display characteristic control circuit. Therefore, the display characteristics of the video signal of an arbitrary channel can be set while visually observing the set amount display means.

According to a fourth aspect of the present invention, the multi-channel split screen display device further includes an ID adding circuit for adding an ID code for identifying the video signals of a plurality of channels switched by the video signal switch. With this configuration, the video signal of each channel can be reliably identified.

Next, a multi-channel split screen display device according to an embodiment of the present invention will be described in detail with reference to the drawings. 1 to 3 are block diagrams showing a configuration example of a multi-channel split screen display device according to an embodiment of the present invention.

(Embodiment 1) FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In FIG. 1, the multi-channel split screen display device of the present embodiment includes a plurality of video input units 1,..., A video switching switch 2, an ID addition circuit 3, a contrast control circuit 4, an AD converter 5, a memory 6, a DA It comprises a converter 7, a video output unit 8, a CRT 9, and a microcomputer 10.

The video input unit 1, which is one of the components, is a video signal input unit corresponding to a video signal input of each channel. The video switching SW2 multiplexes the display by switching the channel of the video signal of the video input unit 1 every frame here. Thereafter, the ID adding circuit 3 assigns an identification code ID for each channel, and the AD converter 5
After being converted into digital data in the memory 6, the data is stored in the memory 6. Thereafter, by operating the memory 6, a multi-channel split screen is formed.

In the process of forming the multi-channel split screen, the video signal is DA-converted by the DA converter 7, processed into an analog video signal by the video output unit 8, and displayed on the CRT 9. The microcomputer 10 controls these operations. Here, the video signal multiplexed by the video switching SW2 is subjected to the contrast control for each channel by the contrast control circuit 4 to change and adjust the sense of contrast for each channel.
Multi-channel split screen display can be performed.

(Embodiment 2) FIG. 2 is a block diagram showing a configuration of an embodiment of the present invention. 2, the multi-channel split screen display device of the present embodiment includes a plurality of video input units 1,..., A video switching switch 2, an ID addition circuit 3, a sharpness control circuit 11, an AD converter 5, a memory 6, a DA It comprises a converter 7, a video output unit 8, a CRT 9, and a microcomputer 10.

A video signal is input to the multi-channel split screen display device constituted by the above-described units via video input units 1,..., 1 corresponding to each of a plurality of channels. The input video signal is switched by the video switch SW2 in the video input unit 1 for each frame, and is multiplexed. Thereafter, an ID, which is an identification code for each channel, is assigned by the ID addition circuit 3, and is AD-converted by the AD converter 5, and then stored in the memory 6. Thereafter, by operating the memory 6, a multi-channel split screen is formed, and is further DA converted by the DA converter 7, processed as an analog video signal by the video output unit 8,
9 is displayed. The microcomputer 10 controls these operations.

Here, the sharpness control circuit 11 controls the sharpness of the video signals multiplexed by the video switching SW2 for each channel.
By this processing, a multi-channel split screen display in which the sense of sharpness is changed and adjusted for each channel can be performed.

(Embodiment 3) FIG. 3 is a block diagram showing the configuration of an embodiment of the present invention. In FIG. 3, the multi-channel split screen display device of the present embodiment includes a plurality of video input units 1,..., A video switching SW2, an ID and image quality setting amount adding circuit 12, an image quality contrast control circuit 1.
3, an AD converter 5, a memory 6, a DA converter 7, a video output unit 8, a CRT 9, and a microcomputer 10.

Video signals of a plurality of channels are input through video input units 1,... Video input unit 1,
.., The video signal input through 1 is a video switching SW2
, The channels are switched every frame and multiplexed. After that, the ID and image quality setting amount adding circuit 12 adds the ID for each channel and the setting amount at the time of image quality setting, performs AD conversion by the AD converter 5, and stores the result in the memory 6. After that, by operating the memory 6, a multi-channel split screen is formed, is DA-converted by the DA converter 7, is processed as an analog video signal by the video output unit 8, and is displayed on the CRT 9. The microcomputer 10 controls these operations.

Here, the image display characteristics are set for each channel while the image signals multiplexed by the image switch SW2 are visually checked by the image quality control circuit 13 by the set amount display means on the screen. With this,
A multi-channel split screen display in which the setting of the screen display characteristics is changed and adjusted for each channel can be performed. here,
The set amount may be displayed as a numerical value on a monitor or a bar graph. In addition, since the image quality setting amount of each channel is displayed on the screen, the setting state of each channel is compared, and confirmation with high accuracy is facilitated.

(Effects of the Embodiments) As is clear from the embodiments of the present invention as described above, the setting of the contrast level or the sharpness level for each channel is performed.
This can be performed with only one contrast control circuit or sharpness control circuit. Further, the screen display characteristics of each channel can be set while checking the screen display. Multi-channel split screen display can be easily performed with high accuracy.

In the first embodiment, when there is a difference in the contrast between the channels, the contrast is corrected for each channel so that the channel can be easily viewed, and when it is desired to increase or decrease the sense of contrast of a specific channel. Has the effect of changing the sense of contrast to give accents, making it easier to see.

The invention according to the second embodiment of the present invention is the multi-channel split screen display device according to the first embodiment, in which a sharpness control circuit is used instead of the contrast control circuit. When there is a gap in the sharpness of each channel, if you want to improve the sharpness of a specific channel by capturing and reducing the sharpness of each channel, if you want to increase or decrease the sharpness of a specific channel, It has the effect of changing the feeling, adding accents to each channel, facilitating identification, and making it easier to view.

The invention according to a third embodiment of the present invention includes a plurality of video input units, a video signal switch, an AD converter for digitizing a video signal, a memory for storing a video signal,
It includes a DA converter that converts a video signal into an analog signal, the control circuit according to the first or second embodiment that changes the image quality of the video signal, a video output unit, and a microcomputer that controls them. As a result, a multi-channel split screen display device capable of setting the image quality of the video signal of an arbitrary channel while checking the setting status by the set amount display means on the screen and displaying the video of a plurality of channels in a divided manner is configured. You. With this configuration, when there is a difference in the screen setting for each channel, the screen setting for each channel is changed while viewing the screen, and has the effect of making it easier to view.

[0026]

As is apparent from the above description, according to the present invention, a plurality of video signals are input, the video signals are selected, and the display characteristics of the video signals of an arbitrary channel are independently changed. Output. Therefore, setting of display characteristics such as a contrast level or a sharpness level for each channel can be performed by a single contrast control circuit, a sharpness control circuit, or the like. Also,
The screen display characteristics of each channel can be set while checking the screen display. Multi-channel split screen display can be easily performed with high accuracy. If there is a difference in the display characteristics for each channel, the display characteristics are corrected or accented for each channel to make it easier to see. The circuit configuration is simplified, and the setting operation is facilitated.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a multi-channel split screen display device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of a multi-channel split screen display device according to a second embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration example of a multi-channel split screen display device according to a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 video input unit 2 video switching SW 3 ID addition circuit 4 contrast control circuit 5 AD converter 6 memory 7 DA converter 8 video output unit 9 CRT 10 microcomputer 11 sharpness control circuit 12 ID and image quality setting amount addition circuit 13 image quality control circuit

Claims (4)

[Claims] A video input unit that inputs a plurality of video signals corresponding to each of the video signals; a video signal switch that selects the plurality of video signals; an AD converter that digitizes the selected video signals; A memory that stores the digitized video signal; a DA converter that converts the digitized video signal into an analog signal; a display characteristic control circuit that changes display characteristics of the digitized video signal; A video output unit for outputting a video signal, and a microcomputer for controlling the operation of each unit. The display characteristics of the video signal of an arbitrary channel are independently changed, and the video signals of the plurality of channels can be divided and displayed. A multi-channel split screen display device characterized in that: 2. The multi-channel split screen display device according to claim 1, wherein the display characteristic is a display characteristic including at least one of contrast, sharpness, and image quality. 3. The multi-channel split screen display device according to claim 1,
The display characteristic control circuit further includes a set amount display unit for monitoring a set amount for changing a display characteristic, and a display characteristic of the video signal of an arbitrary channel can be set while being visually checked by the set amount display unit. 4. The multi-channel split screen display device according to claim 1, wherein: 4. The multi-channel split screen display device,
2. The apparatus according to claim 1, further comprising an ID adding circuit for adding an ID code for identifying the video signals of the plurality of channels switched by the video signal switch.
4. The multi-channel split screen display device according to any one of items 1 to 3.