JP2008298858A - Video display system and video display method - Google Patents

Abstract

A video display system including an economical video display controller that absorbs a difference in display resolution of a video display screen and has no waste in a video control range is provided.
A video display unit including a video display screen 80 composed of a plurality of video display modules 8 and a video that performs a desired video process on an input video signal and sends the video signal to the video display unit The video display system includes the display controller 4, and the video display controller 4 changes the video control range of the input video signal in accordance with the resolution of the video display module 8 constituting the video display screen 80, thereby displaying the video. The unit follows the change in the video control range of the video signal sent from the video display controller 4 and distributes the received video signal corresponding to the plurality of video display modules 8 constituting the video display screen 80. Part 5.
[Selection] Figure 1

Description

  The present invention performs various video effects and functional processing on various video sources input from an external video transmission device, and displays them on a large video display screen in which a plurality of light emitting display elements are arranged as a single pixel. The present invention relates to a video display system and a video display method.

FIG. 11 is a block diagram showing a configuration of a control circuit of a conventional video display device described in Japanese Patent Laid-Open No. 2000-284761 (Patent Document 1).
As shown in the figure, the conventional video display device disclosed in Patent Document 1 includes a horizontal clock counter 212 that counts a clock signal every horizontal period and every vertical period over a valid data period of a data enable input signal 207, and a vertical clock counter 212. The clock counter 213, the horizontal clock count memory 214 and the vertical clock count memory 215 that hold the counted value, and the count value held last time for the next horizontal period or vertical period are used at that time. An input signal generation unit 216 that generates an input signal in a driver IC or drive circuit suitable for the resolution of the display device is provided so that it can be applied to driver ICs and drive circuits that can be used in display devices of various resolutions. .
The data enable input signal is a signal indicating a valid data period in the video data input signal with respect to the time axis.

FIG. 12 is a block diagram showing the configuration of another conventional video display device described in Japanese Patent Laid-Open No. 2001-125531 (Patent Document 2).
As shown in the figure, in the conventional video display device disclosed in Patent Document 2, the video display means 100 displays a video with horizontal resolution m and vertical resolution n, and the video signal input means 110 displays horizontal resolution M, A video signal having a vertical resolution N (satisfying at least one of N> n or M> m) is input to the video display means 100, and the synchronization signal input means 120 generates a video synchronization signal to be displayed on the video display means 100. The video display control information input means 130 inputs the display control information of the display video, and the video display control means 140 receives a display target from the vertical resolution N video signals according to the synchronization signal and information. In addition, a designation signal for the horizontal resolution m to be displayed is generated from the video signal of the horizontal resolution M according to the synchronization signal and information. To output to the video display means 100.
As a result, in the video display device disclosed in Patent Document 2, even if the resolution of the video generated by the video generation means changes variously, it is possible to display on the display means, and further the display means whose resolution is different. Can be handled without changing the image generation means.
Japanese Patent Laid-Open No. 2000-284761 (FIG. 1, abstract) JP 2001-125531 A (FIG. 1, abstract)

The above-described conventional video display device is intended for a drive system of a medium-sized or small-sized video display device such as a liquid crystal display device, and the video display unit (display) is a display video control circuit (video display controller). It is arranged in the vicinity.
Therefore, the video signal processing unit is not limited by the processing speed of the video signal, and the video display unit can control the same resolution as the video source (that is, the video signal output from the video source device). If the resolution is less than the resolution of the video source, there is no limitation.

However, in a large-sized video display device, the distance between the video display controller and the video display screen as the video display unit may be several hundred meters at the maximum.
Therefore, if the video data during this time is parallel transmission, the control lines increase and become thick and bulky, resulting in an increase in cost.
For this reason, video data is transmitted by serial transmission using a coaxial cable or an optical cable. However, since it is serial transmission, there is a limitation that the transmission control range of video data from the video display controller cannot be increased.
Furthermore, even if the resolution of the video display unit changes, the conventional video display device can flexibly follow the change in the display device resolution if the changed video resolution is within the resolution of the video source. .

However, in a large-sized video display device, a block of display modules of about several meters as a basic unit is stacked to form a video display screen in units of several tens of meters or several hundreds of meters.
Since a large video display device is configured by a unit called a module in which a plurality of panels are laid out, the resolution unit of the minimum block of the display module is not fine, for example, 64 pixels or 128 pixels. Exists.

  In consideration of two specific limiting factors specific to large-sized video display devices: “Restriction of video control range caused by video controller” and “Restriction of display module resolution caused by video display screen” In order to cope with the resolution of various video display screens constructed by stacking display module blocks, the video control range of the video display controller can be made variable, the useless control area of the video display controller can be eliminated, and economical. It is necessary to establish a video display control system.

Conventionally, it has been necessary to develop video controller controllers for individual video display screens with different display resolutions one by one, resulting in problems of cost increase such as development period, development cost, and management.
Also, as an extreme example, when the display modules are connected in a row only in the horizontal or vertical direction to form a super-horizontal video display screen or super-vertical video display screen, the video resolution exceeds the resolution of the video source. According to the control method of a conventional video display device, a plurality of control systems respectively corresponding to a plurality of display devices (for example, a super-wide video display screen and a super-long video display screen) are required. There is.

  Various resolution specifications are required for video display screens of large video display devices, such as vertical message boards attached to building walls, baseball stadiums, video video display boards in public stadiums, and US professional basketball fields. In the case of rental of large video display devices for various events, etc., the screen resolution size is different for each event.

  The present invention has been made to solve the above-described problems, and the difference in display resolution between video display screens having various display resolutions by varying the video control range of the video display controller of the large video display device. It is an object of the present invention to provide a video display system and a video display method capable of absorbing an image and arranging an economical video display controller without waste in the video control range.

A video display system according to the present invention includes a video display unit including a video display screen including a plurality of video display modules in which a large number of light emitting display elements are arranged as pixels, and a video signal input from a video source device. A video display system comprising a video display controller that performs desired video processing and sends a video signal to the video display unit,
The video display controller has a function of changing a video control range of the input video signal according to a resolution of a video display module constituting the video display screen, and the video display unit includes the video display controller. A video signal distribution function for following the change in the video control range of the video signal transmitted from the video signal and distributing the received video signal in correspondence with a plurality of video display modules constituting the video display screen. Is.

The video display method according to the present invention includes a video display unit including a video display screen including a plurality of video display modules in which a large number of light emitting display elements are arranged as pixels, and a video signal input from a video source device. A video display method of a video display system comprising a video display controller that performs desired video processing on the video display unit and sends a video signal to the video display unit,
The step of changing the video control range of the input video signal according to the resolution of the video display module constituting the video display screen, and the change of the video control range of the video signal sent from the video display controller. And the step of distributing the received video signal in correspondence with a plurality of video display modules constituting the video display screen.

According to the present invention, it is possible to arrange an economical video display controller without waste in the video control range of the video display controller by absorbing the various display resolution differences of the video display screen and the resolution units of the display module. Thus, there is an effect that the cost can be reduced.
In addition, there is an effect that it is not necessary to carry out development for individual video display screens having different display resolutions that occur when the video control range is not changed.
In addition, the control of the video display screen exceeding the resolution of the video source has an effect that the video display controller can be used without waste.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a diagram conceptually showing the overall configuration of the video display system according to the first embodiment.
In FIG. 1, the video display system is roughly divided into an operation room side 1 and a video display screen side 2.
In general, the distance between the operation room side 1 and the image display screen side 2 is often a long distance. For example, in a large-scale stadium such as a public competition or a baseball field, the distance is 100 to 200 meters. In other words, the distance between the operation room side 1 and the video display screen side 2 is several hundred meters at the maximum, and is configured to support long-distance transmission.

The video source device 3a and the video source device 3b in the operation room side 1 are devices that transmit video data, respectively, and are, for example, computers and video devices.
Video signals (that is, video sources) from these devices are DVI (Digital Visual Interface) video data and video video data, and are input to the video display controller 4.
The video display controller 4 performs various video processing functions on the input DVI video data and video video data, and transmits the video data to the video display screen side separated by a distance of several hundred meters at the maximum.
Depending on the application of the video display system, any one video source device such as the video source device 3a or the video source device 3b is selected and arranged on the operation room side 1.
The video data transmission between the operation room side 1 and the video display screen side 2 is a long distance transmission, a large transmission capacity, and a high transmission speed. The interface uses a long distance transmission standard protocol and uses a coaxial cable, an optical fiber cable, or the like.

The video data transmitted from the operation room side 1 to the video display screen side 2 has a large data capacity and a high data transmission speed.
Therefore, a video signal distribution unit 5 for temporarily buffering high-speed and large-capacity video data is arranged on the video display screen side 2, and the video signal distribution unit 5 distributes the video data after reducing the transmission speed, Video data is output to a video display module 8 equipped with a plurality of video display panels 7.
The video display panel is a light-emitting display element, which is a light-emitting body corresponding to R, G, and each color, mounted in 32 vertical lines and 32 horizontal dots, and is a basic physics when the video display screen 80 is assembled. Unit.
As shown in FIG. 1, each video display module 8 constituting the video display screen 80 is further configured by a number of video display panels 7.

An example of calculating the video signal transmission speed between the video display controller 4 and the video display screen 80 is shown.
When the video control range of the video display controller 4 is 256 × 256 pixels and one frame frequency is 60 Hz, the transmission speed is
60 Hz x 256 pixels horizontally x 256 pixels vertically x 3 (RGB) x 10 bits ≈ 120 MHz
Therefore, high-speed transmission is necessary.

Next, the operation will be described.
FIG. 2 is a diagram for explaining a video capture example 1 of the video display controller according to the first embodiment.
FIG. 2 shows an example of capturing video when the video control range of the video display controller 4 is changed and the control is not optimized for the video display screen 80. The video signal from the video source device is displayed as video. This shows an operation in which a wasteful control area is generated in the video display controller 4 when the display controller 4 takes in.
For example, the video control area of the video display screen is set under the condition that the resolution of the video source 10 is XGA (Extended Graphics Array) standard size horizontal 1024 × 768 pixels, and the video control area 11 of the video display controller is 256 × 256 pixels. 12 (that is, the resolution of the video display screen) is 1024 horizontal x 64 pixels high, in order to display video on the entire video display screen, one video display controller is insufficient and four video display controllers are required. It becomes.
At this time, a wasteful video control area 13 that is not displayed in the video control area 12 of the video display screen is generated in the video control area 11 of the video display controller, and the video control cost performance of the video control area 11 of the video display controller 4 is reduced. Getting worse.

On the other hand, FIG. 3 is a diagram for explaining a video capture example 2 of the video display controller in the first embodiment. The video control range of the video display controller is changed to An example of video capture when the control is optimized is shown, and an operation in which a useless video control area is not generated is shown.
For example, when the video control area 14 of the video display screen has a width of 1024 × 64 pixels, the video control area 15 of the video display controller is the same as or similar to the resolution of the video control area 14 of the video display screen. By changing to, it is possible to operate the video display screen with one video controller (that is, display video on all video display screens with one video controller).
That is, the number of video display controllers used can be reduced from four video display controllers to one video display controller.
Furthermore, it is possible to simultaneously reduce the video control area that is wasted by the video controller, which increases the cost performance of the video control of the video display controller 4.

FIG. 4 shows an example of variable control of the video control range of the video display controller 4.
Here, the resolution of the video source 10 is set to horizontal 1024 × 768 pixels, which is the XGA-based resolution of the personal computer, and variable control of various video display controllers is realized.
FIG. 4 shows several exemplary modes from the resolution in the super-long portrait mode (1024 × 64 pixels) to the resolution in the super-long portrait mode (width 64 × length 768 pixels).
Up to this point, the variable control in the single video display controller has been described. On the video display screen side 2 on the video data receiving side, a function for following the variable control of the upper video display controller 4 is essential.
Furthermore, it is necessary to vary the resolution of the video signal distributed from the video signal distribution unit 5 according to the difference in resolution of the video display module 8 which is a block unit for assembling the video display screen 80.
In general, since the video display module 8 performs control by bit calculation, control by a multiple of 8 is mainstream, and the resolution of the video display module 8 is determined in units of 32, 64, 128 pixels, and the like.

Next, “control on the video display screen side 2” for receiving and following the video control information changing by the video display controller 4 will be described with reference to FIG.
FIG. 5 shows an example of video distribution on the video display screen.
For example, when the video control range of the video display controller 4 is vertical 128 pixels, horizontal 512 pixels, and the video signal from the video display controller 4 is distributed by the video signal distribution unit 5, the video control range of the video display controller 4 is However, the three distributions (Example 1 to Example 3) are possible as shown in FIG.

Here, for example, consider a case where the horizontal size of the resolution of the video display module is 256 pixels.
In Example 1, the horizontal control width of distribution is as small as 128 pixels, and there is no display module for displaying a video area of 128 to 256 pixels, so that it is impossible to distribute and transmit video data from the video display controller 4. .
However, since the horizontal control width is 256 pixels in Example 2 and the horizontal control width is 512 pixels in Example 3, video data can be distributed and transmitted from the video display controller 4.
With respect to the horizontal resolution of the video display module, in the distribution example 2, the video distribution horizontal control range of the video signal distribution unit 5 is 1: 1 (256 pixels to 256 pixels), and the display resolution for the control is the same. In this case, the video distribution horizontal control area is 1: 2 (256 pixels vs. 512 pixels). By controlling connection of a plurality of modules to the video control area, video display in the horizontal control range of the video distribution unit is possible.
In the selection of Example 2 or Example 3, the one with the best cost performance is selected according to the customer specifications in the vertical direction.

  In the above, the horizontal size of the resolution of the display module is 256 pixels. However, there are various sizes such as 128 pixels, 64 pixels, and the like. Depending on customer specifications, the best cost performance will be selected.

Thus, on the video display screen side 2 which is the video data receiving side, it is possible to follow the change in the video control range of the video display controller 4.
Accordingly, the resolution of the video signal distributed by the video signal distribution unit 5 is changed in accordance with the difference in resolution of the display module 8 as a block unit when assembling the video display screen 80, and the video signal is optimally optimized without waste. Can be controlled so that can be displayed on the video display screen.

Next, a case where the video control range (resolution) of the video display screen 80 exceeds the resolution of the video source 10 will be described.
When configuring a super-wide video display screen or a super-long video display screen, the video display screen has a resolution that exceeds the resolution of the video source. According to the conventional display device control method, a plurality of display devices are controlled. Requires a control system.
FIG. 6 shows an example of video distribution by the video signal distribution unit.
In the example (example 4) of FIG. 6A, the capture size of the video display controller 4 is horizontal 1024 pixels and vertical 64 pixels, but the video distribution on the video display screen side is at the midpoint between each horizontal and vertical. By dividing, one distribution becomes horizontal 512 pixels.
By connecting these four physical distributions to the distribution 1, 2, 3, 4 in the horizontal direction on the image display screen, it is possible to display an image display screen having a resolution of 2048 × 32 pixels. And
However, on the video source side, the end point portion of distribution 2 and the start point portion of distribution 3 need to be connected as video content.

Similarly, in the example (example 4) of FIG. 6B, the capture size of the video display controller is 1024 pixels wide by 64 pixels high, but the video distribution on the video display screen side is equally divided in the vertical direction. Thus, one distribution is 1024 pixels wide.
By connecting these four physical distributions to the distributions 1, 2, 3, and 4 in the horizontal direction on the image display screen, it is possible to display an image display screen having a resolution of 4096 × 16 pixels. And
However, on the video source side, the end point portion of distribution 1 and the start point portion of distribution 2, the end point portion of distribution 2 and the start point portion of distribution 3, the end point portion of distribution 3 and the start point portion of distribution 4 are as video content. Need to make connected.
In this way, by changing the distribution control range of the signal distribution unit 5 on the video display screen side on the receiving side, a super-wide video display screen or a super-long video display screen having a resolution exceeding the source resolution is configured. Therefore, an optimized control operation can be performed without increasing the number of video display controllers.

Next, an example of a parameter setting method for the video display controller when performing variable control of the video control range of the video display controller will be described.
There are four types of setting parameters, the horizontal (horizontal) video display controller capture X control width (hereinafter referred to as capture X width) and the vertical (vertical) video display controller capture Y control. Prepare the width (hereinafter referred to as the capture Y width).
As for the distribution size on the video display screen side, the horizontal (horizontal) video display screen distribution X control width (hereinafter referred to as distribution X width) and the vertical (vertical) video display screen distribution Y control width (hereinafter referred to as “distribution size”). , Distribution Y width).

On the video data, the video data for the capture X width control from the video display controller capture start point in the horizontal video direction (hereinafter referred to as start X point) is captured, and only the horizontal video capture is displayed. Temporarily stores in the video storage memory inside the controller.
Similarly, in the vertical video direction, the video display controller capture start point (hereinafter referred to as start Y point) in the vertical video direction is used to capture the video data for the capture Y width control and temporarily stored in the video storage memory. Do.
The video data to be variably controlled is captured by changing the capture X width and capture Y width parameters of the video display controller.
On the video display screen side 2, the video signal distribution unit 5 determines a control area to be distributed to each display module based on the distribution X and distribution Y parameters from the capture control range of the video display controller 4.

FIG. 7 shows an example of setting parameters for variable control of the video display controller.
Examples 1 to 3 correspond to the example of FIG. 5, and the video control range of the video display controller is the same, but the resolution of the video signal distributed from the video signal distribution unit 5 is different.
The resolution parameters for video distribution are set as distribution Y and distribution X, and the video signal distribution unit 5 is selected from four types of parameters including the capture X width and capture Y width which are capture control parameters of the video display controller. To determine the resolution mode to be distributed.
Examples 4 and 5 correspond to the example of FIG.
Except for Examples 1 to 5, a table different from that shown in FIG. 7 is prepared, and operations are performed by specifying representative ones in individual modes.

Next, a format for transmitting video data from the video display controller to the video display screen will be described.
For example, when the video control range of the video display controller is 256 pixels wide × 256 pixels high, it is necessary to transmit 65536 data. This 65536 data is within a vertical cycle that is a display update cycle of video data. It is necessary to perform transmission.
This vertical period corresponds to one frame display period in video display. Generally, the vertical period is 60 Hz or 50 Hz.

FIG. 8 shows an example of a variable video transmission format.
In the long-distance transmission standard protocol, video data that is variably mapped is formatted as unitary data following the header data, and the video data is continuously transmitted to the header data every vertical period.
The header data is data of setting parameters for video display controller variable control required on the video display screen side.

  As described above, the video display system according to the present embodiment includes the video display unit including the video display screen 80 including the video display modules 8 in which a large number of light emitting display elements are arranged as pixels, and the video source. A video display system including a video display controller 4 that performs desired video processing on a video signal input from the device 3a or 3b and sends the video signal to a video display unit. The video display unit has a function of changing the video control range of the input video signal in accordance with the resolution of the video display module 8 constituting the screen 80, and the video display unit controls the video signal sent from the video display controller 4. The video received following the change of the range and corresponding to the plurality of video display modules 8 constituting the video display screen 80. And a video signal distribution function for distributing signals.

  The video display method according to the present invention includes a video display unit including a video display screen including a plurality of video display modules in which a large number of light emitting display elements are arranged as pixels, and a video signal input from a video source device. Is a video display method of a video display system comprising a video display controller that performs desired video processing and sends a video signal to a video display unit, according to the resolution of the video display module constituting the video display screen, The step of changing the video control range of the input video signal and the change of the video control range of the video signal sent from the video display controller are made to correspond to a plurality of video display modules constituting the video display screen. Distributing the received video signal.

Therefore, according to the present embodiment, the various display resolutions of the video display screen and the resolution units of the display modules are absorbed, so that the control range of the video display controller can be saved in an economical video display controller. Arrangement is possible, and cost can be reduced.
Furthermore, it is not necessary to carry out development for individual video display screens having different display resolutions that occur when the video control range is not changed.
In addition, the control of the video display screen exceeding the resolution of the video source can be performed using the video display controller without waste.

Embodiment 2. FIG.
While the first embodiment described above is variable control of video data by one video display controller, in the present embodiment, this is expanded and a plurality of video display controllers are connected and operated. This corresponds to a video display screen having a resolution exceeding that of form 1.
In video data control using a plurality of video display controllers, it is necessary to perform switching of various function settings of the video display screen in synchronization between the video display controllers, so that the master and slave control is performed.
The first video display controller is set as a master (parent), and the remaining video display controllers thereafter are set as slaves (child).
Only the setting from the host operator to the first master is automatically synchronized from the master to all slaves, and the video display is reflected on the video display screen.

FIG. 9 is a diagram for explaining a video capture example of the video display controller according to the second embodiment.
For example, under the condition that the video control range (resolution) 20 of the video display screen is 4096 × 64 pixels and the video source resolution 21 is 1024 × 768 pixels of the XGA base resolution of the personal computer, the video display controller The horizontal video control range (resolution) 22 is limited to 1024 pixels because of the video source.
Therefore, as shown in FIG. 9, the four video display controllers in the first embodiment (that is, the video control range is 1024 × 64 pixels) are connected by shifting 64 pixels in the vertical direction of the video source. Thus, the video control range of 64 pixels in the vertical direction and 4096 pixels in total in the horizontal direction can be logically made possible.

At this time, it is necessary to operate the content of the video source as four horizontal strips of 64 pixels in length.
That is, when the video source is viewed in front, the first rightmost and the second leftmost, the second rightmost and the third leftmost, the third rightmost and the fourth rightmost Content creation is performed assuming that the content at the left end is connected.
As a result, the physically arranged video display screen of 4096 × 64 pixels with resolution is controlled by a plurality of connected video display controllers.
In this way, by adding video display controllers, it is possible to control a video display screen having infinite resolution.

  As described above, the video display system according to the present embodiment is used by connecting a plurality of video display controllers when the resolution of the video display screen exceeds the video control range of one video display controller. Therefore, even when the resolution of the video display screen is increased, video control to the video display screen can be optimally performed without waste.

Embodiment 3 FIG.
In the second embodiment, a plurality of video display controllers are used to control the video display screen. However, in this embodiment, the video data collection of the master video display controller and the slave video display controller is performed. The capture start point and video data capture control size are automatically set.
However, it is assumed that the automatic setting has the same capture size specification for all video display controllers.

Video display controller capture start point (start X point, start Y point) and video display controller capture control size (capture X, capture Y), which are video data capture parameters to the slave video display controller A method algorithm will be described.
It is necessary to set the horizontal video data capture start point and the vertical video data capture parameter in the slave video display controller, but the capture information parameter must be set in each slave video display controller. It becomes complicated.
Therefore, the master video display controller determines the resolution of the video data input to the video display controller, the device address preset in the master video display controller and the slave video display controller, and the video data capture parameter set in the master. Based on this, the video display controller capture start position of each slave is automatically calculated, which part of the video data is automatically determined by each video display controller, and capture information parameters are set.

Next, an example of an automatic setting algorithm will be described.
The master address of the video display controller is set to 0, the slave addresses are sequentially set to 1, 2, 3,..., The horizontal direction of the video source is set to resolution X, the vertical direction is set to resolution Y, and the video control range of the video display controller is set. The horizontal direction capture size X, and the vertical direction capture size Y.
Further, the horizontal direction of the video capture start point of the video display controller is defined as a start point X, and the vertical direction is defined as a start point Y.

The address of the video display controller is physically set in advance by a rotary switch which is an electronic component.
For example, the rotary switch has a display unit of 0 to 15 (decimal) and can be set to a desired value by mechanically turning a setting knob.
The rotary switch outputs an on / off signal from a 4-bit (binary) output terminal station, so that the video display controller can recognize 16 kinds of device addresses.
The video display controller capture start point of the slave controller is automatically calculated from the left side to the right side with respect to the video source in the horizontal direction with respect to the video source, and when the video control area of the slave controller cannot be arranged in the horizontal direction (that is, If the video source resolution is exceeded, the vertical direction is automatically calculated from the upper side to the lower side.

Regarding the video capture start point of the horizontal video display controller, the horizontal video display controller number CONx is calculated from the resolution X, the start point X, and the capture size X based on the following formula.
CONx = ((source resolution X) − (X capture start position)) ÷ (X capture size)
(Note) The remainder is rounded down. And the value obtained by multiplying the start point X by the rotary switch address of the video display controller to be calculated and the capture size X is added. If the rotary switch address exceeds CONx By subtracting a multiple of CONx, a value that is less than or equal to CONx is multiplied by the capture size X.
Further, the horizontal video capture start point X of each video display controller is as follows.
Xn = (start point X) + {remainder of (rotary switch n ÷ CONx)} × (take-in size X)}
Further, the same parameters as the set capture size X are set as the video capture size.
In the above formula, “n” represents a set address.
In the case of the slave address 1, “n” is “1”, and Xn represents the start point of the video display controller of the nth slave controller.

For example, the source resolution is 1024 pixels wide × 768 pixels high, the video control range of one video display controller is 256 pixels wide × 256 pixels high, one master video display controller and four slave video display controllers. The case of is illustrated.
FIG. 10 shows an image of the video control range in this case (that is, when one master controller and four slave controllers are connected).
In the figure, the first video display controller is a master, and the second to fourth video display controllers are slaves.

In the example shown in FIG. 10, “CONx = (1024−4) ÷ 256 = 4”.
The horizontal video capture start point X (X0 to X4) of each video display controller is as follows. First unit X0 = 0 + (0 ÷ 4 remainder = 0) × 256 = 0
Second unit X1 = 0 + (1 ÷ 4 remainder = 1) × 256 = 256
3rd unit X2 = 0 + (2 ÷ 4 remainder = 2) × 256 = 512
4th vehicle X3 = 0 + (3 ÷ 4 remainder = 3) × 256 = 768
5th unit X4 = 0 + (4 ÷ 4 remainder = 0) × 256 = 0

For the video capture start point of the video display controller in the vertical direction, the quotient obtained by dividing CONx from the address of the rotary switch of the video display controller is the number of stages in the vertical direction of the video display controller. And add the starting point Y.
The video capture start point Y in the vertical direction of each video display controller is as follows.
Yn = (start point Y) + (quotient of (rotary switch n ÷ CONx)) × (take-in size Y)

In FIG. 10, for example, the video control range is the case where the source resolution is 1024 pixels wide × 768 pixels vertical, the video control area of the video display controller 1 set is 256 pixels wide × 256 pixels high, and there are four master controllers and slave controllers. The image is shown.
1st unit Y0 = 0 + (0 ÷ 4 quotient = 0) × 256 = 0
Second Y1 = 0 + (1 ÷ 4 quotient = 0) × 256 = 0
3rd unit Y2 = 0 + (2 ÷ 4 quotient = 0) × 256 = 0
4th Y3 = 0 + (3 ÷ 4 quotient = 0) × 256 = 0
5th Y4 = 0 + (4 ÷ 4 quotient = 1) × 256 = 256

  As described above, the video display system according to the present embodiment automatically sets the video capture start point of video signals input to a plurality of video display controllers by calculation. The video display controller can be set with only the master, and when viewed externally, it is equivalent to the one controlled by the integrated video controller, and the convenience of the video display controller is improved.

  The present invention is suitable for a large-sized video display system in which a video display screen is far away from the video display controller. Useful for realization.

1 is a conceptual diagram illustrating an overall configuration of a video display system according to Embodiment 1. FIG. 6 is a diagram for explaining a video capture example 1 of the video display controller according to Embodiment 1. FIG. FIG. 10 is a diagram for explaining a video capture example 2 of the video display controller in the first embodiment. It is a figure which shows the variable control example of the video control range of an image display controller. It is a figure which shows the video distribution example in a video display screen. It is a figure which shows the video distribution example by a video signal distribution part. It is a figure which shows the example of the setting parameter for variable control of a video display controller. It is a figure which shows the example of a variable video transmission format. FIG. 10 is a diagram for explaining a video capture example of the video display controller in the second embodiment. FIG. 10 is a diagram for explaining a characteristic operation of the video display system according to the third embodiment. It is a block diagram which shows the structure of the control circuit of the conventional video display apparatus. It is a block diagram which shows the structure of the control circuit of the other conventional video display apparatus.

Explanation of symbols

3a, 3b Video source device 4 Video display controller 5 Video signal distribution unit 7 Video display panel 8 Video display module 80 Video display screen

Claims (4)

A video display unit including a video display screen including a plurality of video display modules in which a large number of light emitting display elements are arranged as pixels; and a desired video process performed on a video signal input from a video source device; A video display system comprising a video display controller for sending a video signal to a video display unit,
The video display controller has a function of changing a video control range of the input video signal according to a resolution of a video display module constituting the video display screen.
The video display unit follows the change of the video control range of the video signal sent from the video display controller and distributes the received video signal corresponding to a plurality of video display modules constituting the video display screen. A video display system characterized by having a video signal distribution function.   2. The video display system according to claim 1, wherein when the resolution of the video display screen exceeds a video control range of the video display controller, a plurality of the video display controllers are connected and used.   3. The video display system according to claim 2, wherein the setting of video capture start points of video signals input to a plurality of video display controllers is automatically performed by calculation. A video display unit including a video display screen including a plurality of video display modules in which a large number of light emitting display elements are arranged as pixels; and a desired video process performed on a video signal input from a video source device; A video display method of a video display system comprising a video display controller for sending a video signal to a video display unit,
Changing the video control range of the input video signal according to the resolution of the video display module constituting the video display screen;
And following the change in the video control range of the video signal sent from the video display controller, and distributing the received video signal in correspondence with a plurality of video display modules constituting the video display screen. A video display method characterized by this.

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