JP2000305553A - Liquid crystal multi-display system control device and drive circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control circuit enabling a zoom display and a high resolution display with an inexpensive structure in a multi-display comprising multiple liquid crystal displays. SOLUTION: Multi-display circuits 101 receive a control command transferred from a control command issuing part through a control signal bus 01, analyzes the received control command, and generates a set value from an analysis result to set in a corresponding set circuit, thereby allowing the individual multi-display circuits 101 to obtain display data from the same area or different areas to display, resulting in obtaining various display images.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-display comprising a plurality of liquid crystal displays, and more particularly to a control circuit for realizing an enlarged display and a high-definition display with an inexpensive configuration.

[0002]

2. Description of the Related Art A conventional multi-display system has a configuration as described in Japanese Patent Application Laid-Open No. 10-187109, "Multi-display System". This conventional multi-display system will be described with reference to FIG.

In FIG. 29, reference numeral 2901 denotes a monitor unit, 2902 denotes an image input unit, 2903 denotes an A / D converter, 2904 denotes a memory selection unit, and 290
5 is an image memory a, 2906 is an image memory b, 2907 is a switching operation unit, and 2908 is a D /
An A converter 2909 is a display unit, and 291 is a display unit.
0 is a control signal receiving unit, 2911 is a decoding unit, 2912 is a reception control signal memory, 2913 is an ID setting unit, 2914 is a monitor system memory, and 2915 is a monitor control unit. Reference numeral 2916 denotes an image transmission unit; 2917, an image signal generation unit;
19 is a control signal transmitting unit, 2920 is a control signal synthesizing unit, 2921 is a synchronization adjustment unit, 2922 is a monitor ID registration unit, 2923 is a program code generation unit, and 2924 is a frame number generation unit. And 2
Reference numeral 925 denotes a system memory, 2926 denotes a control unit, and 2927 denotes a monitor control program memory.

Reference numeral 2928 denotes an image signal line.
9 is a control signal line.

Next, the operation of the conventional example shown in FIG. 2 will be described.

The image signal generator 29 of the image transmitter 2916
Reference numeral 17 denotes a video signal of a camera, a VTR, a PC, or the like, which is previously edited, and all image data to be displayed and displayed on a plurality of monitor units are converted into a continuous still image analog image signal. Send out.
In addition, for the control of the monitor unit 2901, the data of the monitor ID registration unit 2922, the program code generation unit 2923, the frame number generation unit 2924 of the image, and the monitor control program memory 2927 are synthesized by the control signal synthesis unit 2920. The synthesized digital control signal is sent to the synchronization adjustment unit 2
At 921, the data is synchronized with the image data output from the image transmission unit 2917 and transferred to the monitor unit 2901.

The image data transferred from the image signal circuit 2928 operates according to the control signal transferred from the control signal circuit 2929. The image data is converted to digital image data by the A / D converter 2903 and stored in the image memory a 2905 or the image memory b 2906 via the storage selection circuit 2904. The stored digital image data is read out via the switching operation unit 2907 and is displayed via the D / A converter 2908 on the display unit 290.
9 is displayed. As described above, the frame number of the image data, the ID of the monitor unit 2901 to be displayed, and the like are transmitted as control signals in synchronization with the image data output from the image transmission unit 2916.
01 could be displayed. Incidentally, Japanese Patent Application Laid-Open No. Hei 10-187109 can be cited as this kind of technology.

[0008]

In the conventional multi-display system, since it is necessary to add a frame number and an ID number to each image data, only a still image can be transmitted.

Further, since it is necessary to attach the ID number of the corresponding display device to each display data, a complicated operation is required at the time of processing the display data.

Further, over a plurality of display devices,
Since the means for continuously displaying one piece of display data was not provided on the display device side, it was necessary to perform the work on the display data distribution side.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a control circuit for realizing an enlarged display and a high-definition display with an inexpensive configuration in a multi-display comprising a plurality of liquid crystal displays.

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object.
In a multi-display having a plurality of display panels for inputting display data and displaying the display data on the liquid crystal panel having a plurality of liquid crystal panels having N pixels in the vertical direction, the display apparatus writes the data into a frame memory; Means for reading the display data stored in the frame memory, means for performing enlargement processing for increasing the display data when reading from or after reading from the frame memory, and setting the horizontal writing start position of the display data to be written to the frame memory. Means for instructing, a means for instructing a horizontal writing width to be written to the frame memory, a means for instructing a vertical writing start position to be written to the frame memory, and an instruction for a vertical writing width to be written to the frame memory. Means for instructing the enlargement ratio of the display data read from the frame memory; A microcomputer for setting the ID number is provided for each said display device comprises means for issuing a control signal and a command for transferring a command to the microcomputer, is to configure the display device in two or more.

The means for designating the horizontal writing start position of the display data to be written to the frame memory, the means for designating the horizontal writing width to be written to the frame memory, and the vertical writing to be written to the frame memory. The same value is set in the means for designating the start position, the means for designating the vertical writing width for writing to the frame memory, and the means for designating the enlargement ratio of the display data read from the frame memory. Can display the same display data.

Means for designating a horizontal writing start position of display data to be written into the frame memory;
Means for instructing a horizontal write width for writing to the frame memory, means for indicating a vertical write start position for writing to the frame memory, means for indicating a vertical write width for writing to the frame memory, By setting different values for each display device, display data in different display areas can be displayed, and by performing enlargement processing, one image data transferred from the control device can be transmitted to a plurality of display devices. It becomes possible to enlarge it.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the multi-display of the present invention will be described below.

FIG. 1 is a system configuration diagram of a multi-display system according to the present invention. In FIG. 1, 101 is a multi-display interface circuit, and 102 is a liquid crystal panel. .., N indicate that a plurality (n) of the multi-display interface circuits 101 and the liquid crystal panels 102 exist. A control command issuing unit 01 transfers various control commands to the multi-display interface circuit 101. Reference numeral 02 denotes a display data generation unit which transfers display data to the liquid crystal display 102. Reference numeral 03 denotes a control signal bus, and reference numerals 04, 05, and 06 denote daisy-chained control signal buses. Reference numeral 07 denotes a display data bus.
8, 09 and 10 are daisy-chained display data buses.

FIG. 2 shows an example of a command packet issued from the control command issuing unit 01. (a) stores the ID number of each liquid crystal panel, and (b) stores the content of the control command and necessary data. .

FIG. 3 is an operation flowchart of the system. Command transmission 301 indicates that a command packet is transferred from the control command issuing unit 01 to the multi-display interface circuit 101 via the control signal bus 03, and command reception 302 indicates that the command packet transferred from the control signal bus 03 is multi-displayed. The command packet analysis 303 indicates that the received command packet is analyzed in the multi-display interface circuit 101. Reference numeral 304 denotes an ID number determination, and a command control 305 controls the analyzed command. 306
Means end.

First, an outline of the operation will be described with reference to FIGS.

The multi-display interface circuit 101-1 associated with the liquid crystal panel 102-1 has an ID number 1, the multi-display interface circuit 101-2 associated with the liquid crystal panel 102-2 has an ID number 2, and the liquid crystal panel 102-3. ID number 3 and the liquid crystal panel 102
In the following description, it is assumed that the multi-display interface circuit 101-4 attached to ID-4 is assigned the ID number 4.

The display data generator 02 is a liquid crystal panel 102
Is output to the display data bus 07. The display data is also output to the daisy-chained display data buses 08, 09, and 10. Next, in the command transmission 301, the control command issuing unit 01 adds the ID number “1” to (a) of the command packet in FIG.
To the control signal bus 03 with data necessary for command control. The command packet is also transferred to the daisy-chained control signal buses 04, 05, 06.

Next, in command reception 302, the multi-display interface circuit 101 sets the control signal bus 0
3 is received. next,
The command analyzer 303 analyzes the received command packet, compares the ID number in the command packet with the ID number assigned to the multi-display interface circuit 101 in 304, and executes the command control 305 only when the ID numbers match each other. Control processing of the multi-display interface circuit 101 is performed.

In this case, since the command packet has the ID number "1" added thereto, only the multi-display interface circuit 101-1 is controlled and controlled. Other multi-display interface circuit 10
1-2, multi-display interface circuit 101
-3, multi-display interface circuit 101-
4 can be controlled by adding the ID number of the multi-display interface circuit 101 to be controlled to (a) of the command packet in FIG.

Next, the operation of performing the multi-enlargement control in the above-described system configuration will be described with reference to FIGS.

FIG. 4 is a block diagram of a multi-display according to the present invention. FIG. 5 shows an outline of input display data format and set values of each register when one liquid crystal panel is used (standard resolution). FIG. 6 is an example of a control command packet. FIG. 7 is a data information table stored in the data storage memory. FIG. 8 is an operation flowchart of the multi-magnification control process. FIG. 9 is a display example when the respective register setting values shown in FIG. 5 are displayed on four liquid crystal panels. FIG. 10 is an enlarged display of four liquid crystal panels without display correction. FIG. 11 is an enlarged display example with display correction on four liquid crystal panels.

FIG. 12 is a diagram showing the display data format to be input, the outline of the set value of the register for one liquid crystal panel (standard resolution), and the area displayed for each ID number. FIG. 13 shows the data storage memory. It is a stored data information table. FIG. 14 is a diagram arbitrarily showing an input display data format, an outline of set values of each register for one liquid crystal panel (standard resolution), and an area to be displayed for each ID number. FIG. 15 shows an example of a control command packet. FIG. 16 is an operation flowchart of the area setting process. FIG. 17 is an example of a display when four LCD panels display the set values of each register and the ID number shown in FIG. 14 for each ID number.

In FIG. 4, reference numeral 101 denotes a multi-display interface circuit, which is the same as the multi-display interface circuit 101 shown in FIG. 102
Denotes a liquid crystal panel, which is the same as the liquid crystal panel 102 shown in FIG. The subscripts -1, -2,..., N are the same as in FIG.
This indicates that a plurality (n) of the multi-display interface circuits 101 and the liquid crystal panels 102 exist. A display data bus 103 for inputting display data is the same as the display data bus 07 shown in FIG. 10
4 is an input data processing circuit, 105 is a display data bus for transferring display data inside the multi-display interface circuit 101, and 106 is a display data bus for transferring display data to the next multi-display interface circuit 101. And is the same as the display data buses 08, 09, and 10 shown in FIG.

Reference numeral 107 denotes a frame memory write control circuit, and reference numeral 108 denotes a frame memory read control circuit. Reference numeral 109 denotes a data selector, 110 denotes a frame memory a, and 111 denotes a frame memory b. 1
Reference numeral 12 denotes an enlarged data processing circuit, and reference numeral 113 denotes a display data bus for transferring display data output from the enlarged data processing circuit. Reference numeral 114 denotes an output timing signal generation circuit, and reference numeral 115 denotes a control signal bus for transferring a synchronization signal which is an output timing signal. 116 display data bus 11
3 and a liquid crystal panel interface signal obtained by synthesizing the display data transferred by the control signal bus 115 and the synchronization signal.

Reference numeral 117 denotes a horizontal write position start register, and 118 denotes a horizontal write width register.
Is a vertical write position start register, and 120 is a vertical write width register. With each of these registers,
The frame memory a110 and the frame memory b1 of the display data transferred by the display data buses 103 and 105
It is possible to set an area to be written in the area 11. 121
Is a register for setting the numerator of the enlargement ratio: M when the enlargement ratio is set to M / N when performing the enlarged display, and 122 is a register for setting the denominator N of the enlargement ratio. 123 is a horizontal read position register, and 124 is a vertical read position register. In this embodiment, the horizontal read width,
And the value of the vertical read width, the horizontal write width 11
8 and a vertical writing width 120 are applied. With these registers, the position at which display data to be displayed on the liquid crystal panel 102 is read from the frame memory a110 and the frame memory b111 can be set.

Reference numeral 125 denotes a horizontal period register,
Is a vertical cycle register, which sets the cycle of the horizontal synchronization signal and the cycle of the vertical synchronization signal generated by the output timing signal generation circuit 114, respectively. With this setting, display on the liquid crystal panel 102 having various different timing specifications becomes possible. The timing signal 127 generated by the output timing signal generation circuit 114 serves as a reference for the operation of the frame memory read circuit 108.

Reference numeral 128 denotes a microcomputer; 129, an ID setting circuit; 130, a data storage memory;
31 is a control data processing circuit. Reference numeral 132 denotes a control signal bus for exchanging control data with the control command issuing unit 01 shown in FIG. 1, and is the same as the control signal bus 03 shown in FIG. A control signal bus 133 is connected to the next multi-display interface circuit 101 and exchanges control data, and is the same as the control signal buses 04, 05, and 06 shown in FIG. Reference numeral 134 denotes a data bus inside the multi-display interface circuit 101, which exchanges data between the microcomputer 128 and each register. 135 is a signal for selecting the frame memory a110 or the frame memory b111 from which the display data is read.

FIG. 5 shows the display data generator 02 shown in FIG.
Is a diagram showing the display data format input from the display data bus 103 through the display data bus 103, and the outline of the set values of each register when one liquid crystal panel is used (standard resolution). Reference numeral 501 denotes display data transferred from the display data bus 103. And 5
02 indicates an area where the display data is valid. HSYNC is a horizontal synchronization signal, which is a signal serving as a reference for one horizontal display data. VSYNC is a vertical synchronization signal, which is a signal serving as a reference for one frame of display data. In this embodiment, the timing at which the display data in the horizontal direction becomes valid is assumed to be “A dot” from the rising edge of the HSYNC signal, and the effective display data amount in the horizontal direction is assumed to be “B dot”. The timing at which the display data in the vertical direction becomes valid is defined as the “C line” from the rising edge of the VSYNC signal, and the effective display data amount in the vertical direction is defined as “D line”.

FIG. 6 shows the control command issuing unit 0 shown in FIG.
1A is an example of a control command packet transferred from the control signal bus 1 via the control signal bus 132, (a) is an example of a command packet instructing equal magnification, (b) is an example of a command packet instructing no correction display enlargement, (B) c) is an example of a command packet instructing enlargement with correction display.

7A shows a multi-display interface circuit 101-1, FIG. 7B shows a multi-display interface circuit 101-2, FIG. 7C shows a multi-display interface circuit 101-3, and FIG. 5 is an example of multi-display setting data stored in each data storage memory 130 in 101-4. In each data storage memory 130, the timing (A dot) at which horizontal display data shown in FIG. Effective display data amount in the horizontal direction (B
Dot) the timing at which the display data in the vertical direction becomes valid (line C), the effective display data amount in the vertical direction (line D), and the height of the non-display area above the liquid crystal panel 102 shown in FIGS. (UD line), the height of the lower non-display area (DD line), and the width of the right non-display area (LD
Dot) and the width of the right non-display area (RD dot) are stored.

FIG. 8 shows a multi-display interface circuit 101-1, 101-2, 101-3, 101-.
4 is an operation flow of a multi-display control process performed by each microcomputer 128 in FIG. A command transmission 801 transfers the command packet shown in FIG. 6 via the control signal bus 132 shown in FIG. 802 is a command reception, and 803 is a command analysis, which analyzes the transferred command packet. Reference numeral 804 denotes an ID number read.
Described multi-display interface circuit 101
The ID number is read from the ID setting circuit 129 in the table. 80
5 is the ID number of the analyzed command packet and the I
It is determined whether or not the ID number matches the ID number read by the D number read 804. At step 806, it is determined whether or not the image is to be magnified.
Numeral 7 determines whether or not the display is an enlarged display without correction display, and 808 means an enlarged display with correction display. 809, 81
Reference numerals 0 and 811 denote operations for reading necessary setting values from the data storage memory 130, respectively. Reference numeral 812 denotes an operation for generating a set value for enlarged display without correction display, and reference numeral 813 denotes an operation for generating a set value for enlarged display with corrected display.
814 is a setting for each register, and 815 is a setting 'O
This is a reply of K ', and 816 means the end.

FIG. 9 shows a multi-display interface circuit 101-1, 101-2, 101-3, 101-.
8 is a display example in a case where the microcomputer 128 in FIG. Reference numeral 102 denotes a liquid crystal panel, and reference numeral 901 denotes a display area of each liquid crystal panel 102. The liquid crystal panel 102
The height of the non-display area at the top of the liquid crystal panel 102 is “UD line”, the height of the non-display area at the bottom of the liquid crystal panel 102 is “DD line”, and the width of the non-display area at the right of the liquid crystal panel 102 is “LD”. The width of the non-display area on the right side of the liquid crystal panel 102 is referred to as an “RD dot”. The subscripts -1, -2, -3, and -4 of the liquid crystal panel 102 indicate respective ID numbers, and the liquid crystal panel 1 having the ID number "1" is used.
02-1 is located at the upper left, the liquid crystal panel 102-2 with the ID number "2" is located at the upper right, the liquid crystal panel 102-3 with the ID number "3" is located at the lower left, and the liquid crystal with the ID number "4". Panel 102-4 is located at the lower right.

FIG. 10 shows a multi-display interface circuit 101-1, 101-2, 101-3, 101
This is a display example in a case where it is determined by the microcomputer 128 in -4 that the display 807 shown in FIG. Except for the image displayed on each liquid crystal panel 102, it is the same as FIG. 1001
7 shows a display example of the display area of each liquid crystal panel 102.

FIG. 11 shows a multi-display interface circuit 101-1, 101-2, 101-3, 101
8 is a display example in a case where the enlargement display with correction display of 808 shown in FIG. Except for the image displayed on each liquid crystal panel 102, it is the same as FIG. Reference numeral 1101 denotes a display example of a display area of each liquid crystal panel 102.

FIG. 12 shows the display data generator 02 shown in FIG.
Is a diagram showing a display data format input from the display data bus 103 through the display data bus, an outline of set values of each register for one liquid crystal panel (standard resolution), and an area to be displayed for each ID number. Except for the area to be displayed, it is the same as FIG.

13A shows a multi-display interface circuit 101-1, FIG. 13B shows a multi-display interface circuit 101-2, FIG. 13C shows a multi-display interface circuit 101-3, and FIG. 5 is an example of multi-display setting data stored in each data storage memory 130 in 101-4. In each data storage memory 130, the timing (A dot) at which horizontal display data shown in FIG. Effective display data amount in the horizontal direction (B
Dot) the timing at which the display data in the vertical direction becomes valid (line C), the effective display data amount in the vertical direction (line D), and the height of the non-display area above the liquid crystal panel 102 shown in FIGS. (UD line), the height of the lower non-display area (DD line), and the width of the right non-display area (LD
Dot), the width of the non-display area on the right (RD dot), and each area (upper left coordinate, lower right coordinate) are stored.

FIG. 14 is a diagram showing an input display data format, an outline of set values of each register for one liquid crystal panel (standard resolution), and a display area displayed on each liquid crystal panel 102 shown in FIG. Liquid crystal panel 102-1 (ID
Display area (X1, Y1) (X2, Y
2), display area (X3, Y3) (X4, Y4) of liquid crystal panel 102-2 (ID number '2'), liquid crystal panel 102
-3 (ID number '3') display area (X5, Y5) (X
6, Y6), liquid crystal panel 102-4 (ID number '4')
(X7, Y7) (X8, Y8). Otherwise, it is the same as FIG.

FIG. 15 shows an example of a control command packet, which is transferred from the control command issuing unit 01 shown in FIG. The command content includes an ID number, a control command for setting an area, and a display area (upper left coordinates and lower right coordinates).

FIG. 16 is an operation flowchart of the area setting process. A step 1601 determines whether or not the control command is an area setting. Reference numeral 1602 sets the upper left coordinates and lower right coordinates (display area) shown in FIG. 13 stored in the data storage memory 130 in the multi-display interface circuit 101. Reference numeral 1603 denotes operations 806 to 814 shown in FIG. The same numbers as in FIG. 8 have the same functions as those in FIG. 8, and thus description thereof will be omitted.

FIG. 17 shows an example of display on the four liquid crystal panels in an area for displaying each set value and ID number of each register shown in FIG. Except for the image displayed on each liquid crystal panel 102, it is the same as FIG. Reference numeral 1701 denotes a display example of a display area of each liquid crystal panel 102.

Next, the detailed operation will be described.

In FIG. 4, display data is transferred from the display data generator 02 of FIG. 1 via the display data bus 103. The display data is transferred to the frame memory writing circuit 107 via the input data processing circuit 104 and the display data bus 105. Here, the frame memory write circuit 107 has a horizontal counter (not shown) and a vertical counter (not shown), and has a horizontal write start position register 117, a horizontal write width register 118, a vertical write start position register 119, and a vertical write start register 119. Write width register 12
By comparing the value set to 0 with the counter value output from the horizontal counter and the vertical counter, the frame memory a1
10 or an area to be written to the frame memory b111 is determined, and a write operation is performed.

Therefore, by changing the set value of the horizontal write start position register 117, the frame memory a1
10 or the horizontal position of writing to the frame memory b111 can be controlled, and by changing the set value of the horizontal writing width register 118, the frame memory a110 or
The width in the horizontal direction to be written to the frame memory b111 can be controlled, and the vertical position to be written to the frame memory a110 or the frame memory b111 can be controlled by changing the set value of the vertical write start position register 119. By changing the set value of the width register 120, the width in the vertical direction of writing to the frame memory a110 or the frame memory b111 can be controlled.

If the horizontal direction read position start register 123 is fixed and the set value of the horizontal write start position register 117 is reduced, data starts to be fetched before the effective display data is started. From displaying data,
When the display screen moves to the right side and the set value of the horizontal write start position register 117 is increased, the data starts to be fetched after the effective display data starts, so that the necessary data cannot be displayed as a result, and the effective display is started in the middle. Since the data is to be displayed, the display screen moves to the left.

Here, the frame memory a110 or
The display data written in the frame memory b111 is read by the frame memory reading circuit 108,
Through the enlarged data processing circuit 109, the liquid crystal panel 102
Is forwarded to Here, the reason that two types of the frame memory a110 and the frame memory b111 are provided is that when display data to be input to the frame memory a110 is written, an operation of reading display data to be transferred from the frame memory b111 to the liquid crystal panel 102 is performed. When reading display data to be transferred to the liquid crystal panel 102 from the frame memory a110, the operation for writing the input display data to the frame memory b111 is performed.

Next, an example in which the same screen is displayed for the four multi-displays shown in FIG. 9 will be described with reference to FIGS.
8 will be described. In this embodiment, in order to make the description easy to understand, as described above, the input display resolution (the number of effective display dots in the horizontal direction = “B dot”, the effective display line in the vertical direction = “D line”) ') And the resolution of the liquid crystal panel to be displayed are assumed to be the same.

First, in the command packet transmission 801, the command packet shown in FIG. 6A is transferred from the control command issuing unit shown in FIG. 1 to the control signal bus 132.
Next, the microcomputer 128 in the multi-display interface circuit 101 attached to each liquid crystal panel 102 receives a command packet transferred from the control signal bus 132 by a command packet reception 802. Next, in a command analysis 803, the ID number and the command content are analyzed from the received command packet, and the ID number read 80 is performed.
4, I in the multi-display interface circuit
The ID number is read from the D setting circuit 129. In step 805, the ID number in the command packet and the ID setting circuit 1
The ID number is compared with the ID number read from 29, and if the ID numbers do not match, the process jumps to the end of 816 without doing anything. If the ID numbers match, in step 806, it is determined from the command packet whether or not the display is the same size enlarged display.

Since the command packet shown in FIG. 6A is the same-magnification display, the same-magnification display setting data read 80
In FIG. 9, the horizontal writing start position (A dot) and the number of effective dots in the horizontal direction (B dots) necessary for the same-magnification display are obtained from the data shown in FIG. 7 stored in the data storage memory 130 in the multi-display interface circuit. ), The vertical write start position (line C), and the number of effective lines in the vertical direction (line D) are read.

Next, at 814, each liquid crystal panel 10
Multi-display interface circuit 1 accompanying 2
01 is set to the same value as the set value read by the same-magnification display setting data read 809.
In the horizontal write position start register 117, the A dot at the horizontal write start position is set. The horizontal writing width register 118 stores the dot number B of the effective display data.
Dots are set. In the vertical write position start register 119, the C line of the vertical write start position is set. In the horizontal write width register 120, D lines of the number of effective lines in the vertical direction are set. At this time, since the enlargement ratio (numerator) setting register 121 and the enlargement ratio (denominator) setting register 122 carry out the same magnification,
'1' is set in each register.

Next, at 815, the control command issuing unit 0 shown in FIG.
1 and the end of 816. These processes are shown in FIG.
The ID number of the command packet in (a) is "1" 2 "
By specifying “3” and “4” and executing sequentially, the ID
Each liquid crystal panel 10 set with the numbers 1, 2, 3, and 4
2-1, 102-2, 102-3, and 102-4, the frame memory a110 and the frame memory b111
In this case, the same display area of the display data transferred from the display data generation unit 02 shown in FIG. 1 is fetched and read out, so that a display image similar to that shown in FIG. 9 can be obtained.

Next, with respect to the four multi-displays as shown in FIG. 10, an example in which the display area is divided and enlarged and displayed on each liquid crystal panel will be described with reference to FIGS. 4 and 6 to 8. FIG. In the present embodiment, a description will be given of control that does not consider the non-display area of the liquid crystal panel 102.

First, in the command packet transmission 801, the command packet shown in FIG. 6B is transferred from the control command issuing unit shown in FIG. 1 to the control signal bus 132.
Next, the microcomputer 128 in the multi-display interface circuit 101 attached to each liquid crystal panel 102 receives a command packet transferred from the control signal bus 132 by a command packet reception 802. Next, in a command analysis 803, the ID number and the command content are analyzed from the received command packet, and the ID number read 80 is performed.
4, I in the multi-display interface circuit
The ID number is read from the D setting circuit 129. In step 805, the ID number in the command packet and the ID setting circuit 1
The ID number is compared with the ID number read from 29, and if the ID numbers do not match, the process jumps to the end of 816 without doing anything. If the ID numbers match, in step 806, it is determined from the command packet whether or not the display is the same size enlarged display.

Since the command packet shown in FIG. 6B is a non-corrected enlarged display, the data in the multi-display interface circuit is read by the non-corrected display setting data lead 810 after determining whether or not the correction is not displayed at 807. From the data described in FIG. 7 stored in the storage memory 130, the horizontal writing start position (A dot), the number of effective dots in the horizontal direction (B dot), the vertical writing start position (C line), The data of the number of effective lines (D lines) in the vertical direction is read. Next, 812
Generates a set value of the data for the display without correction, and
In 4, the set value is set in each register of the multi-display interface circuit 101 associated with each liquid crystal panel 102.

The generation of the set value of the data for the display without correction and the details of each register are as follows.

With respect to the setting corresponding to the liquid crystal panel 102-1 having the ID number '1', the horizontal writing position start register 117 is set with the read horizontal writing start position A dot, and the horizontal writing width register 118 is set.
Is set to the number of dots (B / multiplier dot) obtained by dividing the read effective dot count in the horizontal direction by the command packet magnification. In the present embodiment, since the description is made on the assumption that the liquid crystal panel is composed of four liquid crystal panels and the magnification is doubled, the following description is made on the assumption that the magnification of the command packet is twice. In the vertical write position start register 119, the C line of the read vertical write start position is set, and the vertical write width register 12 is set.
0 is set to (D / 2 lines) obtained by dividing the read number of effective lines in the vertical direction by the magnification of the command packet.

Regarding the setting corresponding to the liquid crystal panel 102-2 of ID number '2', the horizontal write position start register 117 stores the read A dot at the horizontal write start position and the read number of effective dots in the horizontal direction. The number of dots (B) divided by the magnification of the command packet
(A + B / 2 dots) is set, and the horizontal writing width register 118 divides the read effective dot number in the horizontal direction by the magnification of the command packet (B / 2 dots). ) Is set, the vertical write position start register 119 sets the C line at the read vertical write start position, and the vertical write width register 120 calculates the read number of valid lines in the vertical direction by the magnification of the command packet. The number of divided lines (D / 2 lines) is set.

Regarding the setting corresponding to the liquid crystal panel 102-3 of ID number "3", the horizontal writing position start register 117 is set with the read dot A at the horizontal writing start position, and the horizontal writing width register 118 is set.
Is set to the number of dots (B / 2 dots) obtained by dividing the read number of effective dots in the horizontal direction by the magnification of the command packet.
Reference numeral 9 denotes a value (C + D / 2 lines) obtained by adding the number of lines (D / 2 lines) obtained by dividing the read C line at the vertical writing start position and the read number of effective lines in the vertical direction by the magnification of the command packet. Is set in the vertical write width register 120, and the number of lines (D / 2 lines) obtained by dividing the read number of effective lines in the vertical direction by the magnification of the command packet is set.

Regarding the setting corresponding to the liquid crystal panel 102-4 of ID number '4', the horizontal write position start register 117 stores the read A dot at the horizontal write start position and the read number of effective dots in the horizontal direction. The number of dots (B) divided by the magnification of the command packet
(A + B / 2 dots) is set, and the horizontal writing width register 118 divides the read effective dot number in the horizontal direction by the magnification of the command packet (B / 2 dots). ) Is set, and the vertical write position start register 119 obtains the number of lines (D / 2 lines) obtained by dividing the read vertical write start position C line and the read vertical effective line number by the command packet magnification. (C
+ D / 2 line) is set, and the vertical write width register 1
Reference numeral 20 denotes the number of lines (D / 2 lines) obtained by dividing the read number of effective lines in the vertical direction by the magnification of the command packet. In addition, the register for setting the enlargement ratio of any of the multi-display interface circuits 101 and the enlargement ratio setting (numerator) register 121 include
2 is set and '1' is set in the enlargement ratio setting (denominator) register 122.

Next, at 815, the completion of the setting is notified via the control signal bus 132 to the control command generator 0 shown in FIG.
1 and the end of 816. As a result, FIG.
It is possible to obtain a display image as described in (1). That is, the liquid crystal panel 102-1 with the ID number "1" displays the display data corresponding to the upper left screen of the input display data for one frame at twice the magnification, and displays the liquid crystal panel 102 with the ID number "2". -2 displays the display data corresponding to the upper right screen of the input display data for one frame in double magnification, and the liquid crystal panel 102-3 of ID number "3" displays
The display data corresponding to the lower left screen among the display data for one frame to be input is displayed at double magnification, and the ID number is displayed.
The liquid crystal panel 102-4 of 4 'displays the display data corresponding to the lower right screen of the input display data for one frame in a double magnification.

As a result, the display data transferred by the display data bus 103 can be enlarged and displayed on a multi-display using four liquid crystal panels 102.

However, the problem of this embodiment is as follows.
This is a point where the continuity of the oblique lines is lost in the graph shown in FIG. That is, the display data that continues above the display screen of the liquid crystal panel 102-3 with the ID number “3” includes the lower non-display area of the liquid crystal panel 102-1 with the ID number “1” and the liquid crystal with the ID number “3”. The image is displayed on the liquid crystal panel 102-1 having the ID number "1" in a manner of jumping over the upper non-display area of the panel 102-3. As indicated by the diagonal line in the previous graph, the liquid crystal panel 10 having the ID number "3"
The horizontal position of the end point of the line displayed in 2-3 and the ID number '
Since the horizontal position of the starting point of the line displayed on the liquid crystal panel 102-1 of 1 'is located at substantially the same position, a display state with a sense of strangeness is obtained.

Similarly, the liquid crystal panel 10 having the ID number “1”
The display data continuous on the right side of the display screen of 2-1 is ID
The liquid crystal panel 102 having the ID number “2” is formed by jumping over the right non-display area of the liquid crystal panel 102-1 having the number “1” and the left non-display area of the liquid crystal panel 102-2 having the ID number “2”. -2. As indicated by the diagonal line in the previous graph, the liquid crystal panel 102-1 having the ID number "1"
And the vertical position of the start point of the line displayed on the liquid crystal panel 102-2 with the ID number '2' is located at substantially the same position, so that the display state has a sense of incongruity. Becomes

An embodiment for solving the problems of the previous embodiment will be described with reference to FIG. 4 and FIGS. Different setting values are set in each register of the multi-display interface circuit 101 associated with each liquid crystal panel 102.

First, in the command packet transmission 801, the command packet shown in FIG. 6C is transferred to the control signal bus 132 from the control command issuing unit shown in FIG.
Next, the microcomputer 128 in the multi-display interface circuit 101 attached to each liquid crystal panel 102 receives a command packet transferred from the control signal bus 132 by a command packet reception 802. Next, in a command analysis 803, the ID number and the command content are analyzed from the received command packet, and the ID number read 80 is performed.
4, I in the multi-display interface circuit
The ID number is read from the D setting circuit 129. In step 805, the ID number in the command packet and the ID setting circuit 1
The ID number is compared with the ID number read from 29, and if the ID numbers do not match, the process jumps to the end of 816 without doing anything. If the ID numbers match, in step 806, it is determined from the command packet whether or not the display is the same size enlarged display.

Since the command packet shown in FIG. 6C is an enlarged display with correction, it is determined whether or not the display is without correction at 807, and further, through the enlarged display with correction 808, a read setting data lead with correction 811. The data storage memory 130 in the multi-display interface circuit
7, the horizontal write start position (A dot), the number of effective dots in the horizontal direction (B dot), the vertical write start position (C line), and the vertical The data of the number of effective lines (D line), the horizontal correction value, and the vertical correction value are read. Next, at 813, a set value of the data for enlarged display with correction is generated, and then at 814, each liquid crystal panel 1 is set.
The generated set value is set in each register of the multi-display interface circuit 101 associated with 02.

The generation of the set value of the data for the display without correction and the details of each register are as follows.

Regarding the setting corresponding to the liquid crystal panel 102-1 having the ID number '1', the horizontal write position start register 117 reads the RD dot of the horizontal correction value read from the A dot at the read horizontal write start position. The horizontal write width register 118 sets the number of dots (B / multiplier dot) obtained by dividing the read effective dot count in the horizontal direction by the magnification of the command packet. Is done.

In this embodiment, since the description is made on the assumption that the liquid crystal panel is composed of four liquid crystal panels and the magnification is double, the magnification of the command packet will be described below as twice. The vertical write position start register 119 is set to a value (C-DD line) obtained by subtracting the read vertical correction value DD line from the read vertical write start position C line. The number of lines (D / 2 lines) obtained by dividing the read number of effective lines in the vertical direction by the magnification of the command packet is set.

Regarding the setting corresponding to the liquid crystal panel 102-2 having the ID number '2', the horizontal writing position start register 117 stores the A dot at the read horizontal writing start position and the read effective dot number in the horizontal direction. The number of dots divided by the magnification of the command packet (B /
2) and a value (A + B / 2 + RD dot) obtained by adding the read RD dot of the horizontal correction value, and the horizontal writing width register 118 stores the read effective dot number in the horizontal direction in the command packet. The number of dots (B / 2 dots) divided by the magnification is set, and the vertical writing position start register 119 subtracts the read vertical correction value DD line from the read vertical writing start position C line. A value (C-DD line) is set, and the vertical write width register 120 is set to the number of lines (D / 2 lines) obtained by dividing the read number of effective lines in the vertical direction by the magnification of the command packet.

Regarding the setting corresponding to the liquid crystal panel 102-3 having the ID number '3', the horizontal write position start register 117 stores the read RD dot of the horizontal correction value from the read A dot at the horizontal write start position. The horizontal write width register 118 sets the number of dots (B / 2 dots) obtained by dividing the read effective number of dots in the horizontal direction by the magnification of the command packet. The vertical write position start register 119 stores the read line number (D / 2 line) obtained by dividing the read C line at the vertical write start position and the read vertical line number by the command packet magnification. The value (C + D / 2 + DD line) obtained by adding the DD line of the vertical correction value is set, Straight write width register 120, the read vertical magnification line number divided by the effective line number the command packet (D / 2 lines) is set.

Regarding the setting corresponding to the liquid crystal panel 102-4 of ID number '4', the horizontal write position start register 117 stores the read A-dot at the horizontal write start position and the read number of effective dots in the horizontal direction. The number of dots divided by the magnification of the command packet (B /
2) and a value (A + B / 2 + RD dot) obtained by adding the read RD dot of the horizontal correction value, and the horizontal writing width register 118 stores the read effective dot number in the horizontal direction in the command packet. The number of dots (B / 2 dots) divided by the magnification is set, and the vertical write position start register 119 determines the number of C lines at the read vertical write start position and the number of read effective lines in the vertical direction in the command packet. A value (C + D / 2 +) obtained by adding the number of lines (D / 2 lines) divided by the magnification and the read-out DD line of the vertical correction value
DD line) is set, and the vertical write width register 120 is set.
Is set to the number of lines (D / 2 lines) obtained by dividing the read number of effective lines in the vertical direction by the magnification of the command packet.

In the register for setting the enlargement ratio of any of the multi-display interface circuits 101, “2” is set in the enlargement ratio setting (numerator) register 121, and “2” is set in the enlargement ratio setting (denominator) register 122. , '
1 'is set. Next, at 515, the fact that the setting is completed is transferred to the control command issuing unit 01 shown in FIG. 1 via the control signal bus 132, and 516 ends. This allows
Frame memory a110 or frame memory b111
The display data including the data of the non-display area transferred by the display data bus 103 is written in the
It is possible to obtain a display image as described in 1. That is, the liquid crystal panels 102-1, 102-2, 102-
The display data to be displayed in each of the non-display areas contacted by the third and fourth 102-4 are not taken in by each multi-display interface circuit 101, and the display data to be displayed on each liquid crystal panel 102 is corrected. In the graph, it is possible to obtain the continuity of the oblique lines. By doing as described above, it is possible to view the display as if looking outside the room from the window frame.

Also, as shown in FIG. 13, the area displayed on each liquid crystal panel in FIG. 12 is stored in each data storage memory 130 in the multi-display interface circuit 101 associated with each liquid crystal panel as upper left and lower right coordinate values. 10 and FIG. 11 can be displayed in the same manner.

First, the display setting shown in FIG. 10 will be described.

Regarding the setting corresponding to the liquid crystal panel 102-1 having the ID number "1", the horizontal writing position start register 117 is set with the A dot of the horizontal writing start position in the same manner as described above, and the horizontal writing width register 11 is set.
8 is set to a value (X2-X1 dot) obtained by subtracting X at the upper left coordinate from X at the lower right coordinate. In the vertical write position start register 119, the C line of the vertical write start position is set in the same manner as described above, and the vertical write width register 120 subtracts Y of the upper left coordinate from Y of the lower right coordinate (line Y2-Y1). ) Is set.

Regarding the setting corresponding to the liquid crystal panel 102-2 of ID number '2', the horizontal writing position start register 117 stores the A dot at the horizontal writing start position,
Value obtained by adding X (X3) at the upper left coordinate (A + X3 dot)
Is set in the horizontal writing width register 118, and a value (X4-X3 dots) obtained by subtracting X in the upper left coordinate from X in the lower right coordinate is set. Vertical write position start register 1
19, the C line at the vertical writing start position is set, and the value (Y4-Y3 line) obtained by subtracting Y at the upper left coordinate from Y at the lower right coordinate is set in the vertical writing width register 120.

Regarding the setting corresponding to the liquid crystal panel 102-1 having the ID number '3', the horizontal writing position start register 117 sets the A dot at the horizontal writing start position in the same manner as described above.
8 is set to a value (X6−X5 dots) obtained by subtracting X in the upper left coordinate from X in the lower right coordinate. The vertical write position start register 119 is a value (A + Y) obtained by adding the C line of the vertical write start position and Y (Y5) of the upper left coordinate.
5 lines) are set, and the vertical write width register 120 is set.
Is a value obtained by subtracting Y at the upper left coordinate from Y at the lower right coordinate (Y6
-Y5 line) is set.

Regarding the setting corresponding to the liquid crystal panel 102-4 of ID number '4', the horizontal write position start register 117 stores the A dot at the horizontal write start position,
Value obtained by adding X (X7) of the upper left coordinate (A + X7 dot)
Is set in the horizontal write width register 118, and a value (X8-X7 dots) obtained by subtracting X in the upper left coordinate from X in the lower right coordinate is set. Vertical write position start register 1
19, a value (A + Y7 line) obtained by adding the vertical writing start position C line and the upper left coordinate Y (Y7) is set, and the vertical writing width register 120 subtracts the upper left coordinate Y from the lower right coordinate Y. The value (Y8-Y7 line) is set. Then, the register for setting the enlargement ratio of any of the multi-display interface circuits 101 includes:
“2” is set in the enlargement ratio setting (numerator) register 121, and “1” is set in the enlargement ratio setting (denominator) register 122.
Is set. This makes it possible to obtain a display image as shown in FIG.

Next, the display setting of FIG. 11 will be described.

Regarding the setting corresponding to the liquid crystal panel 102-1 having the ID number "1", the horizontal write position start register 117 sets the horizontal correction value RD dot from the horizontal write start position A dot in the same manner as described above. The subtracted value (A-RD dot) is set, and the horizontal write width register 118 is set to a value (X2-X1 dot) obtained by subtracting X at the upper left coordinate from X at the lower right coordinate. The vertical write position start register 119 is set to a value obtained by subtracting the vertical correction value DD line from the vertical write start position C line (C-DD line) in the same manner as described above. A value (Y2-Y1 line) obtained by subtracting the upper left coordinate Y from the lower right coordinate Y is set.

Regarding the setting corresponding to the liquid crystal panel 102-2 of ID number '2', the horizontal write position start register 117 stores the A dot at the horizontal write start position, the X (X3 dot) at the upper left coordinate, and the horizontal correction value. (A + X3 + RD dot) is set, and the horizontal writing width register 118 is set to a value obtained by subtracting X in the upper left coordinate from X in the lower right coordinate (X4−X3 dot). The vertical write position start register 119 is set to a value (C-DD line) obtained by subtracting the vertical correction value DD line from the C line at the vertical write start position, and the vertical write width register 120 stores the Y at the lower right coordinate. (Y4-Y3 line) obtained by subtracting Y at the upper left coordinate from is set.

Regarding the setting corresponding to the liquid crystal panel 102-3 of ID number '3', the horizontal writing position start register 117 sets the horizontal correction value RD dot from the horizontal writing start position A dot in the same manner as described above. The subtracted value (A-RD dot) is set, and the horizontal write width register 118 is set to a value obtained by subtracting X in the upper left coordinate from X in the lower right coordinate (X6-X5 dot). The vertical write position start register 119 is set to a value (A + Y5 + UD line) obtained by adding the C line of the vertical write start position, Y (Y5) of the upper left coordinate, and the correction value (UD) in the vertical direction. , Lower right coordinate Y
Is set to a value obtained by subtracting Y at the upper left coordinate from (Y6-Y5 line).

Regarding the setting corresponding to the liquid crystal panel 102-4 of ID number '4', the horizontal writing position start register 117 stores the A dot at the horizontal writing start position, the X (X7 dot) at the upper left coordinate, and the horizontal correction value. (A + X7 + LD dot) is set in the horizontal writing width register 118, and a value (X8-X8 dot) obtained by subtracting X in the upper left coordinate from X in the lower right coordinate is set in the horizontal writing width register 118. The vertical write position start register 119 stores the C line at the vertical write start position and Y (Y
7) and a value obtained by adding the vertical correction value (UD) (A + Y7
+ UD line) is set and the vertical write width register 12
0 is a value obtained by subtracting Y in the upper left coordinate from Y in the lower right coordinate (Y
8-Y7 line) is set.

In the register for setting the enlargement ratio of any of the multi-display interface circuits 101, “2” is set in the enlargement ratio setting (numerator) register 121, and in the enlargement ratio setting (denominator) register 122. , '
1 'is set. This makes it possible to obtain a display image as shown in FIG.

Next, as shown in FIG.
A case will be described in which an area to be displayed on the LCD panel 1, an area to be displayed on the liquid crystal panel 102-2, an area to be displayed on the liquid crystal panel 102-3, and an area to be displayed on the liquid crystal panel 102-4 are arbitrarily designated and displayed.

First, the ID in the command packet shown in FIG.
The number is designated as “1”, the area to be displayed (upper left coordinate, upper right coordinate) is designated, transmitted at 801 from the control command issuing unit 01, and received at 802 as a transmission command packet. Next, the command packet is analyzed in 803,
The ID number in the multi-display interface circuit 101 shown in FIG. 1 is read in 804, and if the ID number in the command packet matches the read ID number in 805, the control command in the command packet is It is determined whether or not an area is set.
Only in the case of the area setting, the data storage memory 13 in the multi-display interface circuit 101 shown in FIG.
The upper left coordinates and the lower right coordinates (display area) shown in FIG. 13 and stored in 0 are set.

Further, I in the command packet shown in FIG.
Each D number is designated as "2", 3 ", 4", and the display area (upper left coordinate, upper right coordinate) is designated and transmitted from the control command issuing unit 01 shown in FIG. The area displayed on panel 201 can be set arbitrarily. Further, by issuing the command packet of FIG. 6, a display image as shown in FIG. 17 can be obtained.

Next, a second embodiment of the present invention will be described with reference to FIGS.

FIG. 18 is a block diagram of a multi-display for realizing the second embodiment of the present invention. FIG. 19 shows a display data format transferred from the display data generator 02 shown in FIG. FIG. 21 is a command packet for realizing the second embodiment, FIG. 21 is an operation flowchart for realizing the second embodiment, and FIG. 22 is a display example displayed in the second embodiment.

In FIG. 18, reference numeral 1801 denotes a multi-display interface circuit of the present invention, and reference numeral 1802 denotes a display pause register, which is a register for fixing a frame memory for reading display data to the frame memory a110 or the frame memory b111. A frame memory read control circuit 1803 reflects the value of the display pause register 1802. Since the same numbers as those in FIG. 4 have the same functions as those in FIG. 4, the description will be omitted here.

In FIG. 19, FIGS. 19 (a), (b),
(C) is a display data format transferred from the display data bus 103, and is the same as 30 in FIG.
Reference numeral 1 denotes a display data format input from the display data generation unit 02 shown in FIG. 1 in the same manner as that shown in FIG. 3, reference numeral 301 denotes valid display data among transferred display data, and reference numeral 302 denotes non-display. This is data for one frame including data. FIG. 19 (b) is the same as in FIG.
Is valid display data among the display data to be transferred,
Reference numeral 1902 denotes one frame of data including non-display data. 19C is the same, and 1903 is valid display data in the transferred display data, and 1904 is one frame of data including non-display data.

FIG. 20 shows the control command issuing unit 0 shown in FIG.
1 is the contents of a command packet transmitted to the control data processing circuit 131 via the control signal bus 132.

In FIG. 21, reference numeral 2101 determines whether or not the control command in the command packet shown in FIG. 20 is the display pause. Reference numeral 2102 sets the display pause. Reference numeral 2103 is for determining whether or not the control command in the command packet is to cancel the display pause. Reference numeral 2104 is for setting the display pause release. 2105 is 8 in FIG.
This is the operation from 06 to 814. The same numbers as in FIG. 8 have the same functions as those in FIG. 8, and thus description thereof will be omitted.

In FIG. 22, 2201-1 and 2201
-3, 2201-4 is an example of displaying the display data shown in FIG. 19A, 2202-2 is an example of displaying the display data shown in FIG. 19B, and 2203-3 is
It is an example in which the display data shown in FIG. 19 (c) is displayed.

Next, the detailed operation of the second embodiment of the present invention will be described.

In FIG. 18, the display pause register 18
02 has a function of fixing the frame memory from which display data is read to the frame memory a110 or the frame memory b111 to the frame memory read control circuit 1803. Therefore, the display pause register 1802
When the setting for reading and fixing the frame memory a110 is made, the frame memory read control circuit 18
In step 03, the display data is continuously read from the frame memory a110 every frame, and the frame memory write control circuit 107 continues to write the display data transferred from the display data buses 103 and 105 in the frame memory b111. Similarly, when the display pause register 1802 is set to read and fix the frame memory b111, the frame memory read control circuit 1803 keeps reading the display data from the frame memory b111 every frame, and the frame memory write control is performed. In the circuit 107, the frame memory a1
10, the display data transferred from the display data buses 103 and 105 is continuously written.

Therefore, when the frame memory from which the display data is read out is fixed, the liquid crystal panel 1 is not affected even if the updated display data is transferred from the display data buses 103 and 105.
The display data displayed in 02 is not updated. When the setting value for fixing the frame memory from which the display data is read out is released to the display pause register 1802, the frame memory read control circuit 1803 and the frame memory write control circuit 107 alternately switch the frame memory a110 and the frame memory a111. Since read control and write control are performed, the liquid crystal panel 1
02 can be updated.

The operation will be described below. First, the ID setting circuit 129 in the multi-display interface circuit 1801-1 attached to the liquid crystal panel 102-1 has the ID
The number “1” is assigned to the ID setting circuit 129 in the multi-display interface circuit 1801-2 attached to the liquid crystal panel 102-2.
3 multi-display interface circuit 1
The ID number “3” is set in the ID setting circuit 129 in the 801-3, and the ID number “4” is set in the ID setting circuit 129 in the multi-display interface circuit 1801-4 attached to the liquid crystal panel 102-4. It is explained as a thing. First, valid display data 301 shown in FIG. 19A is transferred from the display data buses 103 and 105.

At this time, the ID numbers “1”, “2”, “
All of the 3 ′ and '4' liquid crystal panels 102 are the first liquid crystal panels of the present invention.
As shown in FIG. 9 of the embodiment, the effective display data 301 shown in FIG. 19A is displayed. Then, in the command transmission of 801, one of the command packets shown in FIGS.
Multi-display interface circuit 1 accompanying 2
801. A multi-display interface circuit 1801 attached to each liquid crystal panel 102
In step 803, the microcomputer 128 in the multi-display interface circuit 1801 analyzes the received command packet.

At step 804, the ID number set in the ID setting circuit 129 in the multi-display interface circuit 1801 attached to each liquid crystal panel 102 is read, and at step 805, the ID number in the analyzed command packet and the read ID number are read. Are compared, and if they match, a judgment is made at 2101 as to whether the control command of the analyzed command packet is a display pause or not.
02, a display pause is set. If the display pause is not set, it is determined in 2103 whether or not the display pause is released. If the display pause is released, the display pause register 1802 is set in the display pause register 1802 in 2104.

In any of the cases (a), (b), and (c) of FIG. (A) The ID number of the command packet shown in FIG.
By performing the above processing sequentially by designating 3 'and' 4 ', only the frame memory readout circuit 1803 of the multi-display interface circuit 1801 in which the ID numbers'1','3' and '4' are set is used. Is fixed. As a result, the liquid crystal panel 102-
In the display of 1, 102-3, and 102-4, the effective display data 301 shown in FIG.
The display is fixedly displayed as 1, 201-3 and 2201-4.

Next, when the valid display data 1901 shown in FIG. 19B is transferred from the display data buses 103 and 105, only the liquid crystal panel 102-2 which is not in the display pause state is shown in FIG. 21B. The effective display data 1901 is displayed as the display data 2202-2 as shown in FIG.

Next, in the command transmission of 801, a command packet obtained by adding the ID number “2” to the ID number of the command packet of FIG. 20A is transmitted from the control bus 132 to the multi-display interface circuit attached to each liquid crystal panel 102. When transferred to the display panel 1801, the multi-display interface circuit 1801-2 attached to the liquid crystal panel 102-2 having the same ID number sets the display pause in the display pause register 1802.
As a result, only the frame memory readout circuit 1803 of the multi-display interface circuit 1801-2 to which the ID number '2' is set has a fixed frame memory from which data is read. As a result, the liquid crystal panel 102-
2 is displayed as the valid display data 190 shown in FIG.
1 is fixedly displayed as the display data 2202-2.

Next, in the command transmission of 801, a command packet obtained by adding the ID number “3” to the ID number of the command packet of FIG. 20B is transmitted from the control bus 132 to the multi-display interface circuit attached to each liquid crystal panel 102. Transferred to 1801. In this case, I
Display pause release is set in the display pause register 1802 of the multi-display interface circuit 1801-3 associated with the liquid crystal panel 102-3 having the same D number. As a result, the display data is updated in the frame memory of the multi-display interface circuit 1801 to which the ID number “3” has been set. Therefore, when the valid display data 1903 shown in FIG. 19C is transferred from the display data buses 103 and 105, only the liquid crystal panel 102-3 which is not in the display pause state is shown in FIG.
The valid display data 1903 described in (c) is replaced with the display data 22.
03-3 will be displayed.

As described above, the second embodiment of the present invention has an effect that a plurality of different display data can be displayed without providing a display data bus for each liquid crystal panel by providing a display pause function. In the second embodiment, each I
In the liquid crystal panel 102 of the D number, the horizontal write position start register 117, the horizontal write width register 11
8, the vertical write position start register 119, the vertical write width register 120, the enlargement ratio (numerator) setting register 121, and the enlargement ratio (denominator) setting register 122 all have the same value, and are the same as those in the embodiment of FIG. Needless to say, the display pattern can be varied by various combinations of FIG. 10, FIG. 10 and FIG.

Next, a third embodiment of the present invention will be described with reference to FIGS.

FIG. 23 is a system configuration diagram of a multi-display for realizing the third embodiment of the present invention.
FIG. 25 is a block diagram of a multi-display for realizing a third embodiment of the present invention. FIG. 25 is a display data format transferred from the display data generating unit shown in FIG. 23, and FIG. 26 is a third embodiment. FIG. 27 is an operation flowchart for realizing the third embodiment, and FIG. 28 is a display example displayed in the second embodiment.

In FIG. 23, reference numeral 20 denotes a display data generator, which transfers display data to the liquid crystal multi-display in the same manner as the display data generator 02. 21 is a display data bus, and 22, 23 and 24 are daisy-chained display data buses. For the same numbers as in FIG.
Since the function is the same as that of FIG. 1, the description is omitted here.

In FIG. 24, 2401 is a multi-display interface circuit of the present invention, 2402 is another display data bus to which display data is transferred from the display data generator 20 shown in FIG. 23, and 2403 is display data bus. An input data processing circuit for processing display data transferred from the bus 1202, 2405 is an input display data switching register, and 2406 transfers display data to the next stage in the same manner as 22, 22, and 24 shown in FIG. It is a display data bus. Since the same numbers as those in FIG. 4 have the same functions as those in FIG. 4, the description here is omitted.

In FIG. 25, FIG. 25A shows a display data format transferred from the display data bus 103, and FIG. 25B shows a display data format transferred from the display data bus 2402. In FIG. 13A, reference numeral 1301 denotes valid display data among display data transferred from the display data bus 103, and 1302 denotes data for one frame including non-display data. FIG.
The same applies to 3 (b). Reference numeral 1303 denotes valid display data among the display data transferred by the display data bus.
Reference numeral 4 denotes one frame of data including non-display data.

FIG. 26 shows a control data processing circuit 1 from the control command issuing unit shown in FIG.
31 is the contents of the command packet transmitted to the host computer 31.

In FIG. 27, reference numeral 2701 determines whether or not the control command in the command packet is the switching of the display data. Reference numeral 2702 sets the switching of the display data. Reference numeral 2703 denotes the operations 806 to 814 shown in FIG. The same numbers as in FIG. 8 have the same functions as those in FIG. 8, and thus description thereof will be omitted.

In FIG. 28, liquid crystal panels 102-1 and 102-1,
102-3 is the display data 2501 described in FIG.
Are displayed, and 102-2 and 102-4 are shown in FIG.
This is an example in which display data 2503 described in FIG. 5B is displayed.

Next, the detailed operation of the third embodiment of the present invention will be described.

In FIG. 24, the display data switching register 2405 can select each display data transferred from the display data bus 103 and the display data bus 2402. Therefore, when the display data switching register 2403 selects the display data to be transferred on the display data bus 103, the valid display data 1301 shown in FIG. 25A is written to the frame memory a110 or the frame memory b111 and read. And is displayed on the liquid crystal panel 102. The display data switching register 2403 controls the display data bus 24
When the display data to be transferred is selected at 02, FIG.
The valid display data 2503 described in (b) is written to the frame memory a110 or the frame memory b111,
The data is read out and displayed on the liquid crystal panel 102.

Thus, display data to be displayed on liquid crystal panel 102 can be selected.

This will be described. First, the liquid crystal panel 1
The ID number “1” is assigned to the ID setting circuit 129 in the multi-display interface circuit 1801-1 attached to the liquid crystal panel 102-1, and the ID setting circuit 129 in the multi-display interface circuit 1801-2 attached to the liquid crystal panel 102-2. ID number '2', multi-display interface circuit 180 attached to liquid crystal panel 102-3
The ID number “3” is set in the ID setting circuit 129 in the 1-3, and the ID number “4” is set in the ID setting circuit 129 in the multi-display interface circuit 1801-4 attached to the liquid crystal panel 102-4. .

The display switching register 2405 is
Description will be made assuming that display data from the display data bus 103 is selected. First, as shown in FIG. 25A, the effective display data 2501 is transmitted from the display data bus 103.
Is transferred. Similarly, as shown in FIG.
Effective display data 2503 is transferred from the display data bus 2402. At this time, ID numbers "1", "2", "
All of the 3 ′ and '4' liquid crystal panels 102 are the first liquid crystal panels of the present invention.
As shown in FIG. 9 of the embodiment, the effective display data 2501 shown in FIG. 28A is displayed.

Then, in the command transmission of 801,
26 is transferred from the control bus 132 to the multi-display interface circuit 2401 attached to each liquid crystal panel 102. Multi-display interface circuit 240 associated with each liquid crystal panel 102
1 receives the command packet transferred from the control bus 132 at 802, and the microcomputer 128 in the multi-display interface circuit 2401 analyzes the received command packet at 803.

At 804, the ID number set in the ID setting circuit 129 in the multi-display interface circuit 2401 attached to each liquid crystal panel 102 is read. At 805, the ID number in the analyzed command packet and the read ID number are read. Are compared, and if they match, it is determined at 2701 whether or not the control command of the analyzed command packet is display switching, and if it is display switching, display switching is set to the display switching register 2405 at 2702. .

In any of the cases (a), (b), and (c) of FIG. By specifying the ID numbers of the command packets described in FIG. 26 as “2” and “4” and sequentially performing the above processing, the ID numbers “2” and “2” are obtained.
Only the display switching register 2405 of the multi-display interface circuit 2401 for which 4 ′ is set selects the display data from the display data bus 2402. As a result, the display on the liquid crystal panels 102-1 and 102-3 is as shown in FIG.
6 (a) are displayed as display data 2801-1 and 2801-1-3, respectively.
In the display of −2 and 102-4, the effective display data 2503 described in FIG.
01-4 is fixedly displayed, and the display of FIG. 28 becomes possible.

As described above, according to the third embodiment of the present invention, by providing a display data bus switching function, there is an effect that effective display data of a different source can be displayed for each liquid crystal panel. In the third embodiment, in the liquid crystal panel 102 of each ID number, the horizontal write position start register 117, the horizontal write width register 118, the vertical write position start register 119, the vertical write width register 120, the enlargement ratio (numerator) Although the setting register 121 and the enlargement ratio (denominator) setting register 122 have the same value as in the embodiment of FIG. 9, the display patterns can be made variable by various combinations of FIGS. Needless to say.

It is needless to say that the display pattern can be changed by adding the display pause function of the second embodiment.

Further, in the first, second and third embodiments of the present invention, the operation of the multi-display by the four liquid crystal panels 102 has been described. Needless to say, this is possible.

[0129]

According to the embodiment of the present invention, one controller can display various formats on a plurality of liquid crystal panels, so that a multi-display system can be provided at low cost.

Further, according to the embodiment of the present invention, there is an effect that a moving image can be displayed in various formats on a plurality of liquid crystal panels by one control device.

Further, according to the present invention, it is possible to configure a multi-display system that does not require complicated operations such as processing display data on the control device side.

Further, since a means for continuously displaying one display data is provided over a plurality of display devices, it is not necessary to carry out the work on the display data distribution side, and it is easy to use. There is an effect that a multi-display system can be configured.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a multi-display according to the present invention.

FIG. 2 is a diagram showing an example of a control command packet.

FIG. 3 is an operation flowchart of the multi-display system.

FIG. 4 is a block diagram of a multi-display according to the present invention.

FIG. 5 is a schematic diagram of an input display data format and register settings.

FIG. 6 is a diagram showing an example of a control command packet.

FIG. 7 is a diagram showing data information stored in a data storage memory.

FIG. 8 is an operation flowchart of a multi-enlargement control process.

FIG. 9 is a diagram showing a display example of the present invention.

FIG. 10 is a diagram showing a display example of the present invention.

FIG. 11 is a diagram showing a display example of the present invention.

FIG. 12 is a view showing an input display data format, a register setting outline, and a display area for each ID number.

FIG. 13 is a view showing data information stored in a data storage memory.

FIG. 14 is a view showing an input display data format, a register setting outline, and a display area for each ID number.

FIG. 15 is a diagram showing an example of a control command packet.

FIG. 16 is an operation flowchart of an area setting process.

FIG. 17 is a diagram showing a display example of the present invention.

FIG. 18 is a block diagram of a multi-display according to the present invention.

FIG. 19 is an input display data format diagram.

FIG. 20 is a diagram showing an example of a control command packet.

FIG. 21 is an operation flowchart of a display pause process.

FIG. 22 is a view showing a display example of the present invention.

FIG. 23 is a system configuration diagram of a multi-display according to the present invention.

FIG. 24 is a block diagram of a multi-display according to the present invention.

FIG. 25 is an input display data format diagram.

FIG. 26 is a diagram showing an example of a control command packet.

FIG. 27 is an operation flowchart of a display data switching process.

FIG. 28 is a diagram showing a display example of the present invention.

FIG. 29 is a block diagram of a conventional multi-display.

[Explanation of symbols]

01: control command issuing unit, 02: display data generating unit,
03: control signal bus, 04: control signal bus, 05: control signal bus, 06: control signal bus, 07: display data bus, 08: display data bus, 09: display data bus, 1
0 ... display data bus, 20 ... display data generator, 21 ...
Display data bus, 22: display data bus, 23: display data bus, 24: display data bus, 101: multi-display interface circuit, 102: liquid crystal panel, 1
03: display data bus, 104: input data processing circuit,
105: display data bus, 106: display data bus, 1
07: frame memory write control circuit, 108: frame memory read control circuit, 109: data selector,
110: frame memory a, 111: frame memory b, 112: enlarged data processing circuit, 113: display data bus, 114: output timing signal generation circuit, 115:
Control signal bus, 116: liquid crystal panel interface signal, 117: horizontal write position start register, 118
... horizontal write width register, 119 ... vertical write position start register, 120 ... vertical write width register, 121
... Enlargement ratio (numerator) setting register, 122 ... Enlargement ratio (denominator) register, 123 ... Horizontal readout position register, 1
24 vertical read position register, 125 horizontal cycle register, 126 vertical cycle register, 128 microcomputer, 129 ID setting circuit, 130 data storage memory, 131 control data processing circuit, 132 control signal bus, 133 ... control signal bus, 134 ... internal data bus,
135 ... selection signal, 301 ... command packet transmission, 3
02: Command packet reception, 303: Command packet analysis, 304: ID number judgment, 305: Command control, 306: End, 801: Command packet transmission, 8
02: Command packet reception, 803: Command packet analysis, 804: ID number reading, 805: ID number judgment, 806: Same-size display judgment, 807: Correction non-magnification display judgment, 808: Correction enlargement display, 809 ... Same magnification Read display setting data, 810: read enlarged display data without correction, 811: read enlarged display data with correction, 812 ...
Generate enlarged display data without correction, 813 Generate expanded display data with correction, 814 Register setting, 815 Setting O
K 'reply, 816 ... end, 1601 ... area setting judgment, 1
602 area setting 1603 multi-control 1801
Multi display interface circuit, 1802 display pause register, 1803 frame memory read control circuit, 2101 display pause determination, 2102 display pause setting, 2103 display pause release determination, 2104
... Display pause release setting, 2105 ... Multi control, 240
1. Multi-display interface circuit 2402
... Display data bus, 2403 ... Input data processing circuit, 2
404: display data switching circuit, 2405: display data switching register, 2406: display data bus, 27
01: display data switching determination, 2702: display data switching setting, 2703: multi-control, 2901: monitor unit, 2902: image input unit, 2903: A / D converter, 2904: storage selection unit, 2905: image memory a, 2906 ... Image memory b, 2907 ... Switching operation unit, 2908 ... D / A converter, 2909 ... Display unit,
2910: Control signal receiving unit, 2911: Decoding unit, 2
912: reception control signal memory, 2913: ID setting unit,
2914: monitor system memory, 2915: monitor control unit, 2916: image transmission unit, 2917: image signal generation unit, 2919: control signal transmission unit, 2920: control signal synthesis unit, 2921: synchronization adjustment unit, 2922: monitor ID registration Section, 2923 ... program code generation section, 2924 ...
Frame number generator, 2925 ... System memory, 29
26: control unit, 2927: monitor control program memory, 2928: image signal line, 2929: control signal line, HSYNC: horizontal synchronization signal, VSYNC: vertical synchronization signal.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 5/00 510 G09G 5/00 510V 550 550P 550R (72) Inventor Tsutomu Furuhashi Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Prefecture. 1099 Inside Hitachi, Ltd.System Development Laboratory (72) Inventor Tetsuo Takagi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Micro Software Systems, Ltd. (72) Inventor Tomohisa Kohiyama Aso-ku, Kawasaki-shi, Kanagawa 1099 Ozenji, Ltd.System Development Laboratory, Hitachi, Ltd. (72) Inventor Hideki Kamimaki 1099 Ozenji, Aso-ku, Kawasaki City, Kanagawa Prefecture, Ltd.System Development Laboratory, Hitachi, Ltd. (72) Inventor Satoshi Onuma Totsuka, Yokohama-shi, Kanagawa Prefecture 292 Yoshida-cho, Ward In the image information system (72) Inventor Tatsumi Mori 810 Shimoimaizumi, Ebina-shi, Kanagawa F-term in the PC Division, Hitachi, Ltd.F-term (reference) BF15 FA05 FA51 5C080 AA10 BB05 CC06 DD21 DD27 EE19 EE29 GG15 GG17 JJ01 JJ02 JJ05 JJ07 5C082 AA01 AA34 BA27 BA41 BB26 BD02 BD07 CA33 CA85 CB01 DA87 MM02 MM05

Claims (20)

[Claims] 1. A multi-display comprising a liquid crystal panel having M pixels in the horizontal direction and N pixels in the vertical direction, and a plurality of display devices for inputting display data and displaying the display data on the liquid crystal panel. The apparatus includes means for writing to the frame memory, means for reading display data stored in the frame memory, means for performing enlargement processing for increasing display data when reading from or after reading from the frame memory, and means for writing to the frame memory. Means for designating a horizontal writing start position of display data to be written, means for designating a horizontal writing width to be written to the frame memory, means for designating a vertical writing start position to be written to the frame memory, Means for instructing the vertical writing width to be written to the memory, and the enlargement ratio of the display data read from the frame memory. Control command issuing means for issuing a command specifying an instruction for setting a value to each means, and a control command for transferring a control command from the control command issuance. Signal, means for receiving the transferred control command,
A control device for a liquid crystal multi-display system, comprising: a microcomputer configured to analyze control contents specified in the received control command and to set a value in each of the means, and comprising two or more display devices. A means for instructing a horizontal writing start position of display data to be written to the frame memory; a means for instructing a horizontal writing width to be written to the frame memory; The same value is set in the means for designating the writing start position of the frame, the means for designating the vertical writing width for writing to the frame memory, and the means for designating the enlargement ratio of the display data read from the frame memory. 2. The control device according to claim 1, wherein the same display data is displayed on the display device. 3. A means for designating a horizontal writing start position of display data to be written to the frame memory, a means for designating a horizontal writing width to be written to the frame memory, and a vertical direction for writing to the frame memory. Means for instructing the write start position of the frame, means for instructing the vertical write width for writing to the frame memory, different values are set for each display device, and display data of different display areas are displayed. The control device for a liquid crystal multi-display system according to claim 1. 4. In the above-mentioned multi-display, when the display device is continuous in the horizontal direction, the display device designates a dot position next to the last dot captured and displayed by an adjacent display device as a horizontal writing start position. 2. The liquid crystal multi-display system control device according to claim 1, wherein the control unit is set as a means for performing the setting. 5. In the above-mentioned multi-display, when the display device is continuous in the vertical direction, the display device indicates the next line position of the last line fetched and displayed by the adjacent display device as the vertical writing start position. 2. The liquid crystal multi-display system control device according to claim 1, wherein the control unit is set as a means for performing the setting. 6. In the above-mentioned multi-display, when displaying display data smaller than the display resolution of the liquid crystal panel, an enlargement ratio is set in a means for instructing an enlargement ratio of the display data read from the frame memory. 2. The liquid crystal multi-display system control device according to claim 1, wherein an enlarged display is performed. 7. In the multi-display, when the number of dots corresponding to the left and right non-display areas of the liquid crystal panel or any of the left and right non-display areas is n dots, and when the display device is continuous in the horizontal direction, 2. The display device according to claim 1, wherein the display device sets a dot position obtained by adding the n dots to a last dot position of an area captured and displayed by an adjacent display device as a means for designating a horizontal writing start position. LCD multi-display system controller. 8. In the above-mentioned multi-display, when the number of dots corresponding to the left and right non-display areas or the left or right non-display area of the liquid crystal panel is m lines, and when the display device is continuous in the vertical direction, 2. The display device according to claim 1, wherein the display device sets a line position obtained by adding the m lines to a last line position of an area captured and displayed by an adjacent display device as a means for designating a writing start position in a vertical direction. LCD multi-display system controller. 9. A means for designating a horizontal write start position of display data to be written to the frame memory, a means for designating a horizontal write width to be written to the frame memory, and a vertical direction to write to the frame memory. Means for instructing the writing start position of the frame, means for instructing the vertical writing width to be written into the frame memory, setting different values for each display device, and displaying different display data in any display area. The control device for a liquid crystal multi-display system according to claim 1, wherein: 10. A multi-display having a plurality of liquid crystal panels having M pixels in the horizontal direction and N pixels in the vertical direction, and a plurality of display devices for inputting display data and displaying the display data on the liquid crystal panel. The apparatus includes means for writing to the frame memory, means for reading display data stored in the frame memory, and means for reading from the frame memory.
Alternatively, means for performing enlargement processing for increasing display data after reading, means for specifying a horizontal writing start position of display data to be written to the frame memory, and specifying a horizontal writing width to be written to the frame memory. Means, means for designating a vertical writing start position for writing to the frame memory, means for designating a vertical writing width to be written to the frame memory, and means for designating an enlargement ratio of display data read from the frame memory. A means for fixing a frame memory from which display data is read, an ID number provided for each display device, and a control command issuing means for issuing a command specifying a command for setting a value to each means,
A control signal for transferring a control command from the issuance of the control command, a unit for receiving the transferred control command, and a microcomputer for analyzing control contents defined in the received control command and setting a value to each unit And a liquid crystal multi-display system control device, comprising: two or more display devices. 11. A means for designating a horizontal writing start position of display data to be written to the frame memory, a means for designating a horizontal writing width to be written to the frame memory, and a vertical direction for writing to the frame memory. The same value is set in the means for designating the writing start position of the frame, the means for designating the vertical writing width for writing to the frame memory, and the means for designating the enlargement ratio of the display data read from the frame memory. 11. The liquid crystal multi-display system control device according to claim 10, wherein the same display data is displayed on the display device. 12. A means for designating a horizontal writing start position of display data to be written to the frame memory, a means for designating a horizontal writing width to be written to the frame memory, and a vertical direction for writing to the frame memory. Means for instructing the write start position of the frame, means for instructing the vertical write width for writing to the frame memory, different values are set for each display device, and display data of different display areas are displayed. The liquid crystal multi-display system control device according to claim 10. 13. A means for designating a horizontal writing start position of display data to be written to a frame memory, a means for designating a horizontal writing width to be written to a frame memory, and a vertical direction for writing to a frame memory. Means for instructing the writing start position of the frame, means for instructing the vertical writing width to be written into the frame memory, setting different values for each display device, and displaying different display data in any display area. The control device for a liquid crystal multi-display system according to claim 10, wherein: 14. When the first display data is displayed on a plurality of display devices, a frame memory for reading display data from at least one of the plurality of display devices is fixed, and then the second memory is read. The liquid crystal multi-display system control device according to claim 10, wherein the first display data and the second display data are mixedly displayed by transferring the display data to the plurality of display devices. 15. A multi-display comprising a liquid crystal panel having M pixels in the horizontal direction and N pixels in the vertical direction, and a plurality of display devices for inputting display data and displaying the display data on the liquid crystal panel. The apparatus comprises: means for inputting two or more display data; means for selecting two or more display data; means for writing to the frame memory; means for reading out the display data stored in the frame memory; Means for performing enlargement processing for increasing display data at the time of reading or after reading, means for indicating a horizontal writing start position of display data to be written to the frame memory, and horizontal writing width for writing to the frame memory Means for instructing writing in the frame memory, and means for instructing the vertical writing start position in the frame memory. Means for instructing the writing width of the display data, means for instructing the enlargement ratio of the display data read from the frame memory, an ID number provided for each display device, and a command specifying an instruction for setting a value to each means. A control command issuing means for issuing, a control signal for transferring a control command from the control command issuance, a means for receiving the transferred control command, and a control content defined in the received control command for analyzing and A control device for a liquid crystal multi-display system, comprising: a microcomputer for setting a value in each means; and comprising two or more display devices. 16. A means for designating a horizontal writing start position of display data to be written to the frame memory, a means for designating a horizontal writing width to be written to the frame memory, and a vertical direction for writing to the frame memory. The same value is set in the means for designating the writing start position of the frame, the means for designating the vertical writing width to be written to the frame memory, and the means for designating the enlargement ratio of the display data read from the frame memory. 16. The liquid crystal display according to claim 15, wherein, among the input display data, one or more display devices display one display data, and one or more display devices display the other display data. Multi-display system controller. 17. The liquid crystal multi-display system control device according to claim 15, wherein one control device includes two or more display devices, and each display device displays a different screen. 18. One control device includes two or more display devices, wherein the control device and the display device are connected by one display data bus and one control signal bus, and the display device has A control device for a liquid crystal multi-display system, wherein different display data is displayed. 19. In the above two or more display devices,
Display data for one screen transferred from two controllers
19. The liquid crystal multi-display system control device according to claim 18, wherein the display is performed over one or more display devices. 20. In the above two or more display devices,
Display data for one screen transferred from two controllers
19. The liquid crystal multi-display system control device according to claim 18, wherein the display data is displayed over one or more display devices, and the display data corresponding to the non-display area of the connection of the display devices is not displayed.