JP2000330534A - Display device system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize variegated display effects such as the smooth movement of a slave screen at a low cost by reducing loads of a control command issuing part and a control command transfer network part. SOLUTION: A multi-display interface circuit 101 receives just once a macro control command defining a series of such operations as movement, enlargement and reduction of a slave picture through a control command transmission network 1023, decodes inside into display control contents considering each relative positions of a liquid crystal display panel, and executes autonomously a series of control operations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention displays a display data in a partial area on a display screen of a display device (a function called so-called superimposition or small-screen display).
About the system.

[0002]

2. Description of the Related Art A system configuration and operation of a conventional small screen display technique will be described with reference to FIG.

First, a system configuration will be described. FIG.
1 shows a main part of a conventional display device system example. The display system includes a display device 1004, a display data generator 1006 for generating a video to be displayed on the display device 1004, and a control command issuing unit 1005 for issuing a control command for specifying a video display method and an effect. You. The display device 10004 is roughly divided into a display screen unit 1002 for displaying display data, and a display control unit 100 for controlling a display area, a position, and the like of the display data.
Consists of three.

Next, the operation of the conventional system will be described. The display data generator 1006 issues display data to be displayed on the display device as a display data signal. Display control unit 10
03 receives the display data signal and displays the display screen 1002
To display the display data. At this time, regarding the display method of the display data, the control command issuing unit 1
005 issues a control command describing the display method, the display control unit 1003 receives the control command,
The control command is decoded, and display control corresponding to the control command is executed. After that, the display control unit 1 notifies the execution of the control command as an acknowledgment signal.
003 issues a control command 1005. Upon receiving the acknowledgment signal, the control command issuing unit 1005 confirms that the transmitted control command has been received by the display control unit 1003 and that the display processing corresponding to the control command has been executed.

Here, the description of the display method means, for example, that the display data currently received is displayed on the display screen 1002.
This is a description for defining where to display the data, or setting a display enlargement (reduction) rate when displaying the display data.

As described above, the user appropriately issues a control command describing a display method to the display device by using the control command issuing unit 1005, so that a desired display such as a display position and an enlargement ratio can be performed. Display data can be displayed on the display screen portion 1002 using the effect.

In FIG. 9, the contents of the display data signal issued by the display data generation unit 1006 are not displayed on the entire display screen unit 1002 but are slightly shifted rightward from the center of the display screen unit 1002 as a small screen 1001. 2 shows an example displayed. In this case, the control command issuing unit 10
05 instructs the display control unit 1003 to issue a control command of “display received data as a child screen n pixels to the right of the center of the display screen”.
4 was issued.

[0008]

The following problems can occur in the method of the conventional system as described above. That is, this is an increase in overhead in the network 1007 used when the control command issued by the control command issuing unit 1005 is transferred to the display control unit 1003.

This phenomenon becomes serious under the following conditions.
This is a case where the control command issuing unit 1005 issues many control commands to the display control unit 1003 via the network 1007 in a short time. For example, child screen 1001
This condition is met when it is desired to gradually shift the display position of. When it is desired to move the display position to a position 200 pixels to the right from the current position in steps of one pixel, the control command issuing unit 1005 sets the display position to 1
A control command shifted pixel by pixel must be issued continuously 200 times in a short time, and in each case, an acknowledgment signal must be received 200 times from the display control unit 1003 in the same manner. It can be.

Further, in a multi-display environment in which one control command issuing unit issues control commands to a plurality of display devices, the number of required control commands is further increased, and this network overhead problem is more serious. Become

The method of displaying an image on a multi-display is described in, for example, JP-A-7-19981, JP-A-9-204164, JP-A-9-292866, etc. When a small screen is displayed and the display position of the small screen is moved, a large number of control commands must be issued, and the above network overhead problem has not been solved.

As described above, due to the network overhead problem, smooth movement of the child screen,
Display effects such as smooth enlargement / reduction cannot be realized. In order to avoid the network overhead problem, a method of using a high-speed network environment or preparing a plurality of independent control command issuing units in a multi-display environment can be considered, but this increases the overall system cost. It is a problem.

In view of the above problems, the following problems must be solved. It is an object of the present invention to reduce the load on the control command issuing unit and the control command transfer network unit, and realize various display effects such as smooth movement of the small screen at low cost.

[0014]

Means for Solving the Problems As means for solving the problems, the present invention has the following configuration. Means for receiving display data, a display panel for displaying the received display data, a display control means for displaying an arbitrary partial area of the received display data at an arbitrary position on the display panel, and the control method Means for receiving a control command from the outside, which specifies the control command, wherein the display control means has a function of sequentially executing a series of a plurality of control operations specified in the received control command. Is used.

Further, the display control means has a function of gradually changing the display position from the current display position to the end point coordinates if the end point coordinates are specified by the control command. It may be.

Further, when the control command defines the end point coordinates and the movement speed value in the control command, the display control means gradually changes the display position from the current display position to the end point coordinates. It may be characterized by having a function of changing at a speed corresponding to.

[0017] Further, the display control means, if the control command specifies the end value of the enlargement / reduction ratio, gradually increases the display enlargement / reduction ratio value from the current display enlargement / reduction ratio value to the end value of the enlargement / reduction ratio. It may be characterized by having a function of changing to.

Further, when the control command defines the enlargement / reduction ratio end value and the enlargement / reduction ratio change speed value in the control command, the display control means changes the current display enlargement / reduction ratio value to the enlargement / reduction ratio end value. And a function of gradually changing the display enlargement / reduction ratio value at a speed corresponding to the enlargement / reduction ratio change speed value.

Also, a plurality of display data receiving means and a plurality of display panels for displaying the received display data are provided, and the display panels are connected and arranged on a matrix, so that the display panel can be provided as if it were a single display panel. A display control means for displaying an arbitrary partial area of the received display data at an arbitrary position on the display panel, for each display panel, Means for receiving a control command of, the individual display control means, a device having a function of sequentially executing a series of a plurality of control operations specified in the control command that is broadcast, a device characterized by having The present invention is feasible.

Further, the display control means includes an ID setting and storage means, respectively, and performs a series of plural control operations specified by a control command including broadcasted ID information, with the ID information and its own It may be characterized in that it has a function of comparing with the ID information stored in the ID storage means and sequentially executing them when they match.

Further, each of the display control means has a panel position storage means for storing relative position information in a matrix arrangement of the display panels to be controlled, and each of the display control means is common to each display control means. A series of a plurality of control operations specified in the broadcasted control command is converted into a control command content suitable for each panel position in consideration of the relative position of the display panel stored by the panel position storage means. It may be characterized by having a function of decoding and sequentially executing.

Further, the individual display control means may further include a control command including position information that treats the entire display panel arranged on the matrix as one coordinate system.
In view of the relative positions of the display panels stored by the panel position storage means, the display apparatus may have a function of decoding the position information so as to be suitable for each panel position and sequentially executing the position information.

Further, the display control means has a function of gradually changing the display position from the current display position to the end point coordinate if the end point coordinate is specified by the control command. It may be.

Further, if the control command specifies the end point coordinates and the moving speed value in the control command, the display control means gradually changes the display position from the current display position to the end point coordinates. It may be characterized by having a function of changing at a speed corresponding to.

[0025] Further, the display control means, if the control command specifies the end value of the enlargement / reduction ratio, gradually increases the display enlargement / reduction ratio value from the current display enlargement / reduction ratio value to the end value of the enlargement / reduction ratio. It may be characterized by having a function of changing to.

Further, if the control command defines the enlargement / reduction ratio end value and the enlargement / reduction ratio change speed value in the control command, the display control means changes the current display enlargement / reduction ratio value to the enlargement / reduction ratio end value. And a function of gradually changing the display enlargement / reduction ratio value at a speed corresponding to the enlargement / reduction ratio change speed value.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a first embodiment of the present invention, a means for smoothly moving a child screen in a multi-display system will be described below. The essence of the present invention is not limited to a multi-display system, but can be applied to a single-configuration display system. However, in the present embodiment, the load on the control command transmission network tends to increase, so that the present invention is particularly applicable. A multi-display system which is considered to have a large effect was selected as a preferable application example.

FIG. 2 is a system configuration diagram of the multi-display system according to the present embodiment. The system includes a macro control command issuing unit 1017, a display data generating unit 1018, and a multi-screen display device 1016.

The macro control command issuing unit 1017 can issue a macro control command, which is a feature of the present invention, in addition to the control commands that can be transmitted by the conventional control command issuing unit.

The display data generator 1018 generates display data to be displayed on the multi-screen display device as a display data signal.

The multi-screen display device 1016 includes a liquid crystal panel 102-1, a liquid crystal panel 102-2, a liquid crystal panel 10
2-3, liquid crystal panel 102-4, multi-display interface circuit 101-1, multi-display interface circuit 101-2, multi-display interface circuit 101-3, multi-display interface circuit 101-4, display data network for transferring display data 1019 and a control command transfer network 1023 connected in a daisy chain.

First, as shown in FIG. 10, a display control method for displaying display data contents as a sub-screen in the upper left middle portion of the screen will be described with reference to FIG.

The macro control command issuing unit 1017 sends a command having the following contents via the control command transfer network 1023 to the multi-display interface circuit 101-1, the multi-display interface circuit 101-2, and the multi-display interface circuit 101-. 3. Broadcast to the multi-display interface circuit 101-4. The command content is
"Displaying display data at 1x magnification from drawing start coordinates (x0, y0)". However, the coordinates (x0, y0) are represented by a coordinate system as shown in FIG. That is, a multi-screen composed of the liquid crystal panel 102-1, the liquid crystal panel 102-2, the liquid crystal panel 102-3, and the liquid crystal panel 102-4 is regarded as a single screen, and the upper left end is set to (0,0). , The horizontal direction is set as the X coordinate direction, and the vertical direction is set as the Y coordinate direction. In the future, this coordinate system will be referred to as a universal coordinate system. By the way, in this example, the upper end of the multi-screen is set as the origin of the universal coordinate system. However, for example, as shown in FIG. 14, the origin may be shifted by the size of the sub-screen. With this setting, the position of the child screen can be specified more freely.

By the way, in this case, it is assumed that the small screen size of the display data at the magnification of 1 is all enough to fit in the liquid crystal panel D1022. At this time, each multi-display interface circuit that has received the control command interprets (decodes) and executes the control command as follows.

Multi-display interface circuit 1
01-2, Multi-display interface circuit 10
1-3, multi-display interface circuit 101
-4 denotes a liquid crystal panel 102 to be controlled by each
-2, the liquid crystal panel 102-3 and the liquid crystal panel 102-4 indicate that there is no need to display a child screen at all, indicating that the drawing start coordinates (x0, y0) of the control command, the original size of the display data, And, it is determined from the display enlargement ratio. Similarly, the multi-display interface circuit 1
01-1 is a liquid crystal panel 102-1 to be controlled by itself.
Then, it is determined from the content of the control command that the entire child screen is to be displayed. At this time, since the drawing start coordinates (x0, y0) are expressed in the universal coordinate system in the control command, the coordinate values (x0, y0) are converted to the coordinates in the local coordinate system corresponding to the liquid crystal panel D1022. The value is converted to a value, and the position of the child screen displayed on the liquid crystal panel D1022 is controlled.

As described above, the macro command control command issuing unit transmits the control command including the coordinate value using the universal coordinate system to the multi-display interface circuit 101-1, the multi-display interface circuit 101-2, the multi-display interface circuit. By broadcasting to the circuit 101-3 and the multi-display interface circuit 101-4, a small screen can be easily displayed at an arbitrary position.

Next, referring to FIG. 2, a description will be given of a display control method when the display data contents are displayed as a small screen on the screen and smoothly moved as shown in FIG.

The macro control command issuing unit 1017 sends the following macro commands via the control command transfer network 1023 to the multi-display interface circuit 101-1, the multi-display interface circuit 101-2, and the multi-display interface circuit 101. -3, broadcast to the multi-display interface circuit 101-4. The command content is “Drawing start coordinates (x2, y2) from current drawing position
Until display data is moved smoothly. " However, the coordinates (x2, y2) are assumed to be represented by a universal coordinate system. Further, it is possible to add a parameter for defining the moving speed to the content of the command, but here, no moving speed parameter is given for the sake of simplicity.

In this case, assuming that the current display position of the child screen is represented by the drawing start coordinates (x0, y0), as in the previous example, at this time, all the child screens are displayed on the liquid crystal panel. 102-1.

The drawing start coordinates are changed from the current (x0, y0) to (x2,
y2) is gradually changed so that the sub-screen is displayed, and the effect of moving the sub-screen smoothly is realized. For example, the coordinates (x1, In the case where y1) is the drawing start coordinate, the sub-screen is displayed on a different liquid crystal panel for each of the four divided sub-regions.

In this case, the multi-display interface circuit 101-1, the multi-display interface circuit 101-2, the multi-display interface circuit 101-3, and the multi-display interface circuit 101-4 execute the following control. Based on the current drawing start coordinates (x1, y1), the original size of the display data, and the display magnification, each control target multi-display interface circuit determines which part of the sub-screen is to be displayed and in which position. The multi-display interface circuit 101-1, the multi-display interface circuit 101-2, the multi-display interface circuit 101-3, and the multi-display interface circuit 101-4 make their own judgments, and respectively determine the liquid crystal panel 102-1 and the liquid crystal panel 102- 2. Select a sub-screen partial area to be displayed on the liquid crystal panels 102-3 and 102-4 and control the sub-screen position.

As described above, the macro control command issuing unit transmits the macro control command including the coordinate value using the universal coordinate system to the multi-display interface circuit A1012, the multi-display interface circuit B1013, the multi-display interface circuit C1014, and By broadcasting once to the multi-display interface circuit D1015, the currently displayed child screen can be easily moved to and displayed at an arbitrary position.

Next, the configuration and operation of each multi-display interface circuit for realizing the above-described functions will be described in more detail.

FIG. 1 is a block diagram showing the configuration of a multi-display interface circuit 101 and a liquid crystal panel 102 according to the present invention. FIG. 3 shows an outline of input display data format and set values of each register in the case of a configuration of four liquid crystal panels (the same display screen). FIG. 4 is a display example when displaying with each register setting value shown in FIG. FIG.
It is an input display data format and an outline of set values of each register in a configuration of four liquid crystal panels (no display correction).
FIG. 6 is a display example (enlarged display example) when displaying with the register setting values shown in FIG. FIG. 7 is an overview of the display data format to be input and the set values of each register when four liquid crystal panels are configured. FIG. 8 is a display example (enlarged display example) when displaying with each register setting value described in FIG.

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 display data bus 103 for inputting display data is a part of the display data network 1019 in FIG. 10
Reference numeral 4 denotes an input data processing circuit; and 105, a display data bus for transferring display data to the inside of the multi-display interface circuit 101. Reference numeral 106 denotes a display data bus for transferring display data to the next multi-display interface circuit 101, which is a part of the display data network 1019 in FIG. 107 is a frame memory write control circuit, and 108 is 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. Reference numeral 112 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. 1
This is a liquid crystal panel interface signal obtained by synthesizing the display data and the synchronization signal transferred by the 16 display data buses 113 and the control signal bus 115.

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 cycle 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. 132 is a control signal bus for exchanging control data with an external system,
133 is the next multi-display interface circuit 1
01 is a control signal bus for exchanging control data. 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. 3 shows a display data generator 1018 (FIG. 2).
FIG. 4 is a diagram showing a display data format input from the display data generator and an outline of set values of respective registers when the liquid crystal panel is composed of four panels (the same display screen).
8 (see FIG. 2) is the display data transferred from
Reference numeral 2 denotes an area in which 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. 4 shows an example of display when each of the register setting values shown in FIG. 3 is displayed. 102 is a liquid crystal panel,
Reference numeral 401 denotes a display area of each liquid crystal panel 102. In the present embodiment, the liquid crystal panel 102
The horizontal display effective area is referred to as “B dot”, and the vertical display effective area is referred to as “D dot”. In addition, the height of the non-display area above the liquid crystal panel 102 is set to 'UDm
m, the height of the lower non-display area of the liquid crystal panel 102 is “DDmm”, the width of the lower non-display area of the liquid crystal panel 102 is “LDmm”, and the lower non-display area of the liquid crystal panel 102 is Is set to 'RDmm'. Therefore, assuming that the pixel pitch of the liquid crystal panel 102 of this embodiment is “Emm”, the non-display area above the liquid crystal panel 102 is “UD /
The non-display area at the lower part of the liquid crystal panel 102 becomes “DD / E dot”, the non-display area at the right part of the liquid crystal panel 102 becomes “LD / E dot”, and the non-display area at the right part of the liquid crystal panel 102 becomes The display area is “RD / E dots”.

The subscripts -1,-of the liquid crystal panel 102
2, -3 and -4 indicate respective ID numbers,
The liquid crystal panel 102-1 with the ID number "1" is located at the upper left, the liquid crystal panel 102-2 with the ID number "2" is located at the upper right, and the liquid crystal panel 102-3 with the ID number "3" is located at the lower left. , The liquid crystal panel 102-4 with the ID number '4' is located at the lower right.

FIG. 5 shows a display data format to be input and a configuration of four liquid crystal panels (no display correction), similarly to FIG.
The outline of the set value of each register at the time is shown in FIG.
This is a case where the enlarged display is performed without being aware of the non-display area.

FIG. 6 shows an example of an enlarged display when the display is made with the register set values shown in FIG. Except for the image displayed on each liquid crystal panel 102, it is the same as FIG. 601
7 shows a display example of the display area of each liquid crystal panel 102.

FIG. 7 shows a display data format to be input and a configuration of four liquid crystal panels (with display correction), similarly to FIG.
The outline of the set value of each register at the time is shown in FIG.
In this case, the enlarged display is performed in consideration of the non-display area.

FIG. 8 is an example of an enlarged display when displaying with the register set values shown in FIG. Except for the image displayed on each liquid crystal panel 102, it is the same as FIG. 801
7 shows a display example of the display area of each liquid crystal panel 102.

Next, the detailed operation will be described with reference to FIG. In FIG. 1, display data transferred from the display data generation unit 1018 is transferred via the display data bus 103. The display data is input data processing circuit 10
4. Transferred to the frame memory writing circuit 107 via 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. The value set in the write width register lower part 120 is compared with the counter values output from the horizontal counter and the vertical counter to determine an area to be written to the frame memory a110 or the frame memory b111, and to execute a write operation. . Therefore, by changing the set value of the horizontal write start position register 117, the frame memory a110 or the frame memory b
The position in the horizontal direction of writing into the frame memory 111 can be controlled, and the horizontal width to be written into the frame memory a110 or the frame memory b111 can be controlled by changing the set value of the horizontal writing width register 118. By changing the set value of 119, the position in the vertical direction to be written in the frame memory a110 or the frame memory b111 can be controlled.
, The width in the vertical direction of writing to the frame memory a110 or the frame memory b111 can be controlled. If the horizontal read position start register 123 is fixed and the set value of the horizontal write start position register 117 is reduced, the data starts to be read before the effective display data starts, and as a result, the excess read data is displayed. Therefore, the display screen moves to the right, and if the set value of the horizontal write start position register 117 is increased, the data starts to be fetched after the effective display data is started. As a result, necessary data cannot be displayed. Since the effective display data is displayed halfway, 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.

The microcomputer 128 receives the command (control command) transferred from the control bus 132 and expands the data stored in the data storage memory 130 into each of the registers described above.

At this time, as the command transferred from the control bus 132, a single control command common to each multi-display interface circuit is broadcast. Therefore, each multi-display interface circuit determines, based on the ID setting value set in the internal ID setting circuit 129, where the liquid crystal panel 102 that it controls is relatively positioned in the multi-screen display device (upper right, right (Lower, upper left, lower left, etc.) is recognized, and the control command is decoded according to its own display position and expanded in each register.

Of course, the command transferred from the control bus 132 is not a broadcast of a single control command, but a control command for each multi-screen display device.
A D number may be added. In this case, the ID number plays a role in which of the multi-display interface circuits 101 causes the instruction to be executed.
Therefore, the microcomputer 128 compares the ID setting value set in the ID setting circuit 129 (this is information indicating the relative position of each display panel on the multi-screen) with the ID number attached to the instruction, and finds a match. In this case, the instruction is executed.

Next, an example in which the same screen is displayed for four multi-displays as shown in FIG. 4 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.

Each register of the multi-display interface circuit 101 attached to each liquid crystal panel 102 has:
The same setting value is set.

Therefore, even if the command transferred from the control bus 132 is a broadcast of a single control command common to each multi-display interface circuit, each of the multi-display interface circuits has its own ID number. Regardless, the same register setting operation may be performed.

The horizontal write position start register 117 is set with the number of dots (= “A dot”) at the position where valid display data starts from the horizontal synchronization signal HSYNC. The number of dots (= 'B dot') is set in the vertical writing position start register 119. The number of lines (= 'C line') at the position where valid display data starts from the vertical synchronization signal VSYNC is set. The horizontal write width register 120 is set with the number of lines (= 'D line'), which is the number of lines of valid display data.
At this time, since the same magnification is performed in the enlargement ratio (numerator) setting register 121 and the enlargement ratio (denominator) setting register 122, both registers are set to "1".
As a result, each of the liquid crystal panels 102-1, 102-2, 102-3, and 1 having the ID numbers 1, 2, 3, and 4 has been set.
Since the same display area of the display data transferred from the system is fetched and read into the frame memory a110 and the frame memory b111 associated with 02-4, a similar display image can be obtained.

Next, with respect to the four multi-displays as shown in FIG. 6, an example in which the display area is divided and enlarged and displayed on each liquid crystal panel will be described. 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.

Each register of the multi-display interface circuit 101 attached to each liquid crystal panel 102 has:
Different setting values are set.

Therefore, when the command transferred from the control bus 132 broadcasts a single control command common to each multi-display interface circuit, each multi-display interface circuit corresponds to its own ID number. Perform register setting operation.

Specifically, as shown in FIG. 5, the liquid crystal panels 102-1, 102-3 having ID numbers "1" and "3" are used.
, The horizontal write position start register 117 stores the number of dots (= 'A dot') at the position where valid display data starts from the horizontal synchronization signal HSYNC.
Is set in the horizontal writing width register 118, and the number of dots (= 'B / 2 dots') which is half the number of dots of the effective display data is set. Regarding the settings corresponding to the liquid crystal panels 102-2 and 102-4 of ID numbers "2" and "4", the horizontal writing position start register 117 stores the number of dots at the position where valid display data starts from the horizontal synchronization signal HSYNC. (= 'A dot') and a value (= 'A + B / 2 dot') obtained by adding half the number of dots (= 'B / 2 dots) of the number of dots of the effective display data. Further, the horizontal writing width register 118 is set to a dot number (= 'B / 2 dots') that is half the number of dots of the effective display data.

Next, regarding the settings corresponding to the liquid crystal panels 102-1 and 102-2 with ID numbers "1" and "2", the vertical write position start register 119 starts valid display data from the vertical synchronization signal VSYNC. The number of lines at the position (= 'C line') is set, and the number of lines (= 'D / 2 lines') that is half the number of lines of valid display data is set in the vertical writing width register 120. Next, the liquid crystal panels 102-3 with ID numbers "3" and "4"
Regarding the setting corresponding to 102-4, the vertical write position start register 119 stores the number of lines (= 'C) at the position where valid display data starts from the vertical synchronization signal VSYNC.
Line ') and a value (=' C + D) obtained by adding half the number of lines of the effective display data (= 'D / 2 lines')
/ 2 line ') is set. Further, in the vertical writing width register 120, a line number (= 'D / 2 line') which is half of the line number of the effective display data 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. That is, the ID number
The liquid crystal panel 102-1 of 1 ′ displays the display data corresponding to the upper left screen of the input display data of one frame in a double magnification, and displays the liquid crystal panel 102 of ID number “2”.
-2, the display data corresponding to the upper right screen among the display data for one frame to be input is displayed in a double magnification, and the ID is displayed.
The liquid crystal panel 102-3 with the number "3" displays the display data corresponding to the lower left screen of the input display data for one frame at twice magnification, and the liquid crystal panel 102-4 with the ID number "4" displays the data. The display data corresponding to the lower right screen of the input display data for one frame is displayed 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 the above example is that the continuity of oblique lines is lost in the graph shown in FIG. That is, the liquid crystal panel 1 with the ID number “3”
The display data continuous above the display screen of 02-3 is I
The liquid crystal panel 102-1 having the ID number “1” jumps over the lower non-display area of the liquid crystal panel 102-1 having the D number “1” and the upper non-display area of the liquid crystal panel 102-3 having the ID number “3”. 1 will be displayed. As indicated by the diagonal line in the previous graph, the liquid crystal panel 102-3 having the ID number “3” is displayed.
And the horizontal position of the start point of the line displayed on the liquid crystal panel 102-1 with the ID number "1" is located at substantially the same position as the horizontal position of the end point of the line displayed on the LCD. Becomes Similarly, the liquid crystal panel 1 having the ID number “1”
The display data continuous to the right of the display screen of No. 02-1 is I
The liquid crystal panel with the ID number "2" is jumped over the right non-display area of the liquid crystal panel 102-1 with the D number "1" and the left non-display area of the liquid crystal panel 102-2 with the ID number "2". 102-2. 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 example for solving this problem will be described below with reference to FIGS.

As described above, assuming that the pixel pitch of the liquid crystal panel 102 of this embodiment is “Emm”, the non-display area above the liquid crystal panel 102 is “UD / E dots”.
And the non-display area below the liquid crystal panel 102 is' DD
/ E dot ”, the non-display area on the right side of the liquid crystal panel 102 becomes“ LD / E dot ”, and the non-display area on the right side of the liquid crystal panel 102 becomes“ RD / E dot ”.

Each register of the multi-display interface circuit 101 attached to each liquid crystal panel 102 has:
Different setting values are set.

Therefore, when the command transferred from the control bus 132 broadcasts a single control command common to each multi-display interface circuit, each multi-display interface circuit corresponds to its own ID number. Perform register setting operation.

More specifically, as shown in FIG. 7, the liquid crystal panels 102-1, 102-3 having ID numbers "1" and "3" are used.
, The horizontal write position start register 117 stores the number of dots (= 'A dot') at the position where valid display data starts from the horizontal synchronization signal HSYNC.
(= 'A / D dots') in the right non-display area of the liquid crystal panel 102 is subtracted from the value (=' A
−RD / E dot ′) is set. In the horizontal writing width register 118, the number of dots (= 'B / 2 dots') that is half the number of dots of the effective display data is set. Also, ID
Liquid crystal panels 102-2 and 102- of numbers "2" and "4"
Regarding the setting corresponding to 4, the horizontal write position start register 117 stores the number of dots at the position where the effective display data starts from the horizontal synchronization signal HSYNC (= “A dot”) and the number of dots that is half the number of dots of the effective display data. (= 'B / 2 dots') and the value (= 'A + B / 2 + LD / E dots') obtained by adding the dot number conversion value (= 'LD / E dots') of the left non-display area of the liquid crystal panel 102 Is done. Further, the horizontal writing width register 118 is set to a dot number (= 'B / 2 dots') that is half the number of dots of the effective display data.

Next, regarding the settings corresponding to the liquid crystal panels 102-1 and 102-2 with ID numbers "1" and "2", the vertical write position start register 119 starts valid display data from the vertical synchronization signal VSYNC. A value (= 'C-DD / E dot) obtained by subtracting the dot number conversion value (=' DD / E dot ') of the lower non-display area of the liquid crystal panel 102 from the number of lines at the position (=' C line ') ') Is set. In the vertical writing width register 120, the number of lines (= 'D / 2') which is half the number of lines of the effective display data is set. Therefore, the display data including the non-display data transferred from the display data bus 103 is stored in the frame memory a.
110 or the frame memory b111. Next, regarding the settings corresponding to the liquid crystal panels 102-3 and 102-4 of ID numbers '3' and '4', the vertical writing position start register 119 sets the position where valid display data starts from the vertical synchronization signal VSYNC. The number of lines (= “C line”), the number of lines that are half of the number of lines of effective display data (= “D / 2 lines”), and the converted value of the number of dots in the upper non-display area of the liquid crystal panel 401 (= “U”)
D / E dot ') (=' C + D / 2 + UD
/ Edot ') is set. Further, in the vertical writing width register 120, the number of lines (= 'D / 2') which is half the number of lines of valid display data is set.

Accordingly, the display data including the data of the non-display area transferred by the display data bus 103 is written to the frame memory a110 or the frame memory b111.

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. That is, the liquid crystal panel 1
The display data to be displayed on each liquid crystal panel 102 is not taken in by each multi-display interface circuit 101 without displaying the display data to be displayed in each non-display area contacted by each of the liquid crystal panels 102-1, 102-2, 102-3, and 102-4. The correction makes it possible to obtain the continuity of the oblique lines in the graph shown in FIG. By doing as described above, it is possible to view the display as if looking outside the room from the window frame.

As described above, the microcomputer 128
By rewriting the values of the horizontal write position start register 117, horizontal write width register 118, vertical write position start register 119, and vertical write width register 120, any of the display data screens transmitted via the display data bus 103 can be changed. The image can be cut out at an arbitrary size from the position and stored in the frame memory a110 or the frame memory b. Then, the microcomputer rewrites the values of the horizontal read position start register 123 and the vertical read position register 124 so that an image cut out at an arbitrary position and an arbitrary size stored in the frame memory a110 or the frame memory b described above. Can be displayed at any position on the liquid crystal panel 102.

That is, the microcomputer converts the display position given in the universal coordinate system into the local coordinate system on each liquid crystal panel 102, and of the transmitted display data, a partial area to be displayed on each liquid crystal panel 102. , And the display position is calculated, and the value of the register group is rewritten so as to correspond to the display position, whereby the image data of an arbitrary position in the display data and an arbitrary region is displayed at an arbitrary position on the liquid crystal panel 102. It becomes possible.

Then, the microcomputer 128 sequentially rewrites the values of the register group with the passage of time, so that the display position of the child screen displayed on the liquid crystal panel 102 can be gradually shifted. This gives an effect to the user that the child screen moves smoothly in the multi liquid crystal panel.

The operation flow for the microcomputer 128 in each multi-display interface circuit 101 to give the effect of moving the child screen smoothly in the liquid crystal panel will be supplementarily described with reference to the flowchart shown in FIG. The microcomputer 128 stores areas (drawing start coordinate value variables) X and Y in the internal memory where the drawing start coordinate values in the X coordinate direction and the Y coordinate direction in the universal coordinate system are stored.
Is set, and the drawing start coordinate value when the child screen moving operation is started is set as an initial value (2001).

The microcomputer 128 calculates X and Y respectively by Δ
x and Δy are added to update the value (2002). here,
Δx and Δy indicate the amounts of movement in the X and Y directions, respectively. For example, when the macro control command includes a parameter of a moving speed value, the microcomputer 128 can change the moving speed by increasing or decreasing the moving amount.

The microcomputer 128 calculates the current drawing start coordinates,
From the small screen size, a small screen partial area to be displayed on the control target display panel and a display position in local coordinates are calculated (2003).

The microcomputer 128 sets the value of the register based on the above calculation result so that the sub-screen partial area of a desired size can be displayed at a desired position on the display panel to be controlled (2004).

For example, when the macro control command includes a parameter of the movement speed value, the microcomputer 128 may adjust the speed of the movement control operation by inserting a weight corresponding to the movement speed value using an internal timer or the like. Good (200
5).

If the current drawing start coordinate values X and Y do not match the destination end points x2 and y2, the flow returns to (2002) and the above flow is repeated. Otherwise, it is determined that the movement control operation has been completed, and the control operation is ended (200).
6).

As described above, it has been shown that the smooth movement of the sub-screen display position can be easily executed by the macro control command. However, this is not limited to the realization of the movement display effect, but also the realization of other various display effects. Of course, it can be easily applied. For example, the present invention can be applied to a smooth enlargement and reduction display effect of a small screen display. In this case, the macro control command issuing unit 1017 may broadcast a macro control command having the following contents, for example. That is,
"Smoothly expands from the current enlargement rate to twice the enlargement rate"
And so on. Further, it is of course possible to add a parameter defining the scaling speed to the command content.

The effects of the enlargement and reduction of the child screen are very similar to the effects of the movement described above, and the enlargement ratio setting register (numerator) 12 is replaced with the above-mentioned register group.
1 and the value of the enlargement ratio setting register (denominator) 122
It is only necessary for the microcomputer to sequentially rewrite the data over time.

In addition to the enlargement / reduction, for the display effects such as the deformation and rotation of the child screen, the effects to be realized are defined as macro control commands, and the multi-display interface circuit 101-1 and the multi-display interface circuit 101-2 are defined. , The multi-display interface circuit 101-3 and the multi-display interface circuit 101-4 are provided with control functions for interpreting those macro control commands and independently operating to obtain desired effects. It can be easily realized only by:

[0093] As Embodiment 2 of the present invention, effective use of a means for moving a small screen smoothly in a multi-display system will be described.

FIG. 13 shows a multi-display constructed by arranging four XGA resolution (1024 pixels × 768 pixels) displays on a matrix, and doubling the display data of the XGA resolution size both vertically and horizontally. It is the schematic diagram when it expands and it displays as if it looks at the outdoor from a window frame.

At this time, since there is a frame area 1052 between each display, the display data that has been enlarged twice is not displayed in the full displayable area of the four displays, but is displayed at the end of each display. A border area 1053 which is a non-display area exists.

It is possible to select an enlargement magnification other than 2 times, so that a border area does not exist. However, if the display data includes character (character) data, the enlargement magnification is a power of 2. There may be a case where it is desired to set the enlargement magnification to twice, for example, a natural enlarged image can be obtained by enlarging.

At this time, the macro control command described in the first embodiment for smoothly moving the display screen with respect to the display position of the display data that has been enlarged twice and is displayed almost on the multi-display is used. By intermittently changing the display position of the display data,
The following effects can be obtained. First, when display data is displayed at a certain display position, a partial area of the display data that should always be below the display frame portion 1052 cannot be seen by the user, but the display position moves with time. This allows the user to see the display data partial area that has been hidden under the display frame 1052 until now. In other words, by continuing to watch the moving display data for a certain time, the user can visually obtain all the information of the display data. As a result, it is possible to solve a problem in which an invisible area has always existed due to the restriction of the display frame section 1052. Also, by shifting the display position using the above-described macro control command with time, it is possible to avoid a display burn-in phenomenon or the like.

[0098]

As described above, according to the first embodiment of the present invention, the load on the control command issuing unit and the control command transfer network unit can be reduced, and various display effects such as smooth movement of the child screen can be reduced. It can be realized at cost.

Further, according to the second embodiment, in a multi-display environment, the problem that the user could not see all the display data information because of the existence of the display frame portion in the past was solved, Enables data to be obtained by the user. Further, the display burn-in problem can be avoided.

[Brief description of the drawings]

FIG. 1 is a block diagram of a multi-display interface circuit according to the present invention.

FIG. 2 is a system configuration example according to the first embodiment;

FIG. 3 is a schematic diagram of an input display data format and register setting.

FIG. 4 is a display example 1 of the present invention.

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

FIG. 6 is a display example 2 of the present invention.

FIG. 7 is a schematic diagram showing an input display data format and register settings.

FIG. 8 is a display example 3 of the present invention.

FIG. 9 is a configuration diagram of a conventional system.

FIG. 10 is a still image display example of a child screen.

FIG. 11 is a moving display example of a child screen.

FIG. 12 is an operation flowchart of a microcomputer at the time of child screen movement control.

FIG. 13 is an enlarged display example in a multi-display environment.

FIG. 14 is an example of how to obtain universal coordinates.

[Explanation of symbols]

1016: Multi-screen display device, 1017: Macro control command issuing unit, 1018: Display data generating unit, 101
... multi-display interface circuit, 102 ... liquid crystal panel, 103 ... display data bus, 104 ...
Input data processing circuit 105 Display data bus 106
... display data bus 107 ... 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 ...
LCD panel interface signal, 117: horizontal writing position start register, 118: horizontal writing 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 read position register, 124: vertical read position register, 125 ... Horizontal cycle register, 126: vertical cycle register, 128: microcomputer, 129: ID setting circuit,
130: memory for data storage, 131: control data processing circuit, 132: control signal bus, 133: control signal bus, 134: internal data bus, 135: selection signal.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/445 H04N 5/66 D5 / 66 G09G 5/36 520E (72) Inventor Yuji Saeki Ebina, Kanagawa 810, Imashita, Ichimo, Hitachi, Ltd.PC Division, Hitachi, Ltd. (72) Inventor Kazushi Kobayashi, 810, Shimoimaizumi, Ebina, Kanagawa Prefecture, PC Division, Hitachi, Ltd. 1099 Ozenji-ku, Hitachi, Ltd.System Development Laboratory, Hitachi, Ltd. (72) Inventor: Tsutomu Furuhashi F-term in the System Development Laboratory of Hitachi, Ltd. 5C023 AA02 AA04 AA14 AA18 AA28 AA38 BA01 BA11 BA15 CA01 CA05 DA04 5C025 AA28 BA27 BA28 CA02 CA06 CA09 DA06 5C058 AA07 AA08 BA17 BA21 BA23 BA24 BB13 BB19 5C082 AA03 AA34 BA02 BA12 BB01 BB15 BD07 CA33 CA34 CA52 CA63 DA53 MM02 MM07

Claims (5)

[Claims] 1. Display means for receiving display data, a display panel for displaying the received display data, and display control means for displaying an arbitrary partial area of the received display data at an arbitrary position on the display panel. And a means for receiving an external control command specifying the control method, wherein the display control means has a function of sequentially executing a series of a plurality of control operations specified in the received control command. Device characterized by 2. The display control means according to claim 1, wherein, if an end point coordinate is specified by a control command, the display control means has a function of gradually changing the display position from the current display position to the end point coordinate. The device according to claim 1. 3. The display control means, if the end point coordinates and the moving speed value are defined by the control command, gradually change the display position from the current display position to the end point coordinates according to the moving speed value. 2. The apparatus according to claim 1, wherein the apparatus has a function of changing at a predetermined speed. 4. The display control means according to claim 1, wherein said control command specifies the end value of the enlargement / reduction ratio, and gradually changes the display enlargement / reduction ratio value from the present display enlargement / reduction ratio value to the end value of said enlargement / reduction ratio. 2. The device according to claim 1, wherein the device has a function of causing the device to perform the operation. 5. The display control means according to claim 1, wherein said control command specifies a final scale value of said enlargement / reduction ratio and a change speed value of said enlargement / reduction ratio. 2. The apparatus according to claim 1, further comprising a function of gradually changing the enlargement / reduction ratio value at a speed corresponding to the enlargement / reduction ratio change speed value.