JP2009251307A - Image display system and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an image which is originally displayed in one display from being hampered by image displaying in the case when an image drawn in the drawing area of an image of other display is displayed in the one display. <P>SOLUTION: In an address conversion section 16, when writing addresses Xadr and Yadr generated by a memory control section 13 are the addresses in a first area 101, write addresses of frame memories 11 and 12 are converted to addresses corresponding to a second area 102. At this time, in the memory control section 13, only when generated write addresses Xadr and Yadr are the addresses corresponding to the first area 101, write data of the frame memories 11 and 12 are made effective. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image display system and an image display method, and is particularly suitable for use in temporarily fixing and displaying at least a part of an image being displayed.

  In recent years, there has been an increase in the opportunity to display and display content created by application software of a personal computer (hereinafter referred to as PC) on a large screen display. Here, the display displays the image data output from the PC as it is. Therefore, when the content for presentation is prepared in a plurality of files, if the image data output from the PC is displayed on the display as it is, an image in the middle of changing the file is displayed on the display. .

  As a means for solving such inconvenience, there is a display provided with a “freeze” function for temporarily fixing (freezing) the screen displayed immediately before. That is, while the display on the main display is frozen, the next screen to be displayed is confirmed on the sub display (PC display) at hand. Then, when the confirmation is completed, the display on the main display is released and normal display is performed so that an unnecessary halfway image is not displayed on the main display.

If this scene is replaced with an educational site, it can be applied to a use case in which the teacher displays the assignments to the students on the main display on the large screen while the teacher prepares the next screen using the sub display. .
As the main display used here, a matrix drive type display such as an LCD or a PDP is mainly used. The matrix drive display performs a drive specific to a display device such as a 120 Hz drive display for the purpose of flicker countermeasures and an intermediate gradation display by a subfield method. For this reason, a frame memory for two screens is provided. In this matrix drive type display, a so-called double buffer operation is performed, in which image data is written to one frame memory and the image data is read alternately from the other frame memory.

There is a technique for realizing the above-described “freeze” function by stopping the double buffer operation of the frame memory and constantly reading the data stored in one frame memory (see Patent Document 1).
By the way, it is assumed that the main display placed at the educational site includes coordinate input means integrated with the display area. A use case may be considered in which the student writes an answer to the task displayed on the main display using the coordinate input means. However, the conventional technique described in Patent Document 1 in which the screen is simply “frozen” cannot cope with such a use case.

  Therefore, in a frame memory for two screens performing a double buffer operation, there is a technique in which data read from a predetermined area of one frame memory is written to a corresponding area of the other frame memory, and data in the corresponding area is not rewritten thereafter. Yes (see Patent Document 2). In this way, a “frozen” screen can be provided as part of the normal display screen. In other words, if the conventional technique described in Patent Document 2 is used, it is possible to set a display area that does not “freeze” in a screen that is “frozen”, and to write an answer in the display area that does not “freeze”. The above use case can be dealt with.

Japanese Patent Laid-Open No. 10-260667 JP-A-11-296130

However, in the technique described in Patent Document 2 described above, the display area that does not “freeze” on the main display is a position that corresponds to the display position on the sub display on a one-to-one basis. Therefore, if the display of the region that is not “frozen” is a different image at the time of “freezing” and the current time, the written image is overwritten on the different display and displayed on the main display. Therefore, there is a problem that the entire image displayed on the main display may become an inconsistent image.
In addition, since the image written on the main display is overwritten on the sub display, there is a problem that the image on the sub display becomes difficult to see. Specifically, in the use case described above, there is a problem that the confirmation work of the teacher is hindered.
The present invention has been made in view of the above problems, and it is possible to provide an area where display content is not fixed in an arbitrary area of a screen where display content is temporarily fixed. Objective.

  The image display system of the present invention includes a generation unit that generates common image data to be displayed on the main display device and the sub display device, and a memory area that can store image data for at least one screen. A memory for storing the image data generated by the means, a first instruction means for instructing a write address of the image data to the memory, and a write address instructed by the first instruction means are preset in one screen If the address corresponds to the first area, the address conversion means for converting the address into an address corresponding to a preset second area on one screen, and the address conversion means converts the address. Prohibiting means for prohibiting writing of image data to an address other than the specified address, and an image written in the memory Second instruction means for instructing a data read address; and first display means for outputting image data read from the memory based on an instruction from the second instruction means to the main display device; And second output means for outputting an image based on the image data generated by the generating means to the sub display device.

  The image display method of the present invention includes a generation step of generating common image data to be displayed on the main display device and the sub display device, and a memory area capable of storing image data for at least one screen, and the generation A first instruction step for instructing a write address of the image data to the memory storing the image data generated in the step, and a write address instructed by the first instruction step is set to a first preset in one screen. The address conversion step for converting the address into an address corresponding to a preset second region on one screen, and an address other than the address converted by the address conversion step. A prohibition step for prohibiting writing of image data to the address, and writing to the memory And a first display step for outputting the image data read from the memory based on an instruction in the second instruction step to the main display device. And a second output step of outputting an image based on the image data generated in the generation step to the sub display device.

  According to the present invention, when the address corresponds to the first area on one screen, the address is converted into an address corresponding to the second area on one screen and to an address other than the converted address. The writing of image data is prohibited. Therefore, the main display device displays the same image as the image displayed in the first region in the sub display device in the second region, and a fixed image is displayed for the region other than the second region. indicate. In this way, by arbitrarily setting the first area and the second area within the screen, the area where the display content is not fixed is added to the arbitrary area of the screen where the display content is temporarily fixed. It can be provided on the display screen of the display device. Furthermore, by arbitrarily setting the first area and the second area within the screen, the image displayed in the second area of the sub display device may interfere with the image originally displayed on the sub display device. Can be prevented as much as possible.

(First embodiment)
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an example of a schematic configuration of an image display system according to the present embodiment.
In FIG. 1, the image display system includes a display unit 10, a control unit 20, an image drawing unit 30, an external operation IF 40, an external monitor IF 50, an external monitor 60, and an external operation unit 70. .
The display unit 10 includes display device frame memories 11 and 12, a memory control unit 13, switch units 14 and 15, an address conversion unit 16, a timing generator (TG) 17, and a display device 18. Yes. The image drawing unit 30 includes an image drawing unit 31 and an image drawing frame memory 32. In the following description, the display device frame memories 11 and 12 and the image drawing frame memory 32 are abbreviated as frame memories as necessary.

  In the configuration shown in FIG. 1, each of the frame memories 11 and 12 has a memory area (storage capacity) capable of storing image data for at least one screen. During the vertical scanning period, the image data output from the image drawing unit 31 is written to the frame memory 11 via the switch unit 14, and the image data stored in the frame memory 12 is read via the switch unit 15. In the next vertical scanning period, the image data output from the image drawing unit 31 is written into the frame memory 12 through the switch unit 14, and the image data stored in the frame memory 11 through the switch unit 15 is stored in the frame memory 12. Read out. The display unit 10 displays the image data read from the frame memories 11 and 12 on the display device 18 by performing a so-called double buffer operation in which such writing / reading operations are alternately repeated every vertical scanning period. In the present embodiment, the display device 18 serves as a main display (main display device).

The timing generator 17 generates a drive pulse for the display device 18 and a memory control synchronization signal used in the memory control unit 13 based on the input vertical synchronization signal, horizontal synchronization signal, and data enable signal.
The memory control unit 13 generates an address for controlling the write address / read address of the frame memories 11 and 12 and a control signal. In the present embodiment, the frame memories 11 and 12 are assumed to be SDRAM (Synchronous DRAM). Therefore, the control signal generated by the memory control unit 13 is a command combining / CS, / RAS, / CAS, and / WE. In the present embodiment, the frame memories 11 and 12 form an address space in which the vertical pixel position starting from the upper left of the screen of the display device 18 is a row address and the horizontal pixel position is a column address. Therefore, the count value of the data enable signal can be used as the row address with reference to the vertical synchronization signal. Further, the count value of the pixel clock signal can be used as a column address with reference to the horizontal synchronization signal and the data enable signal. Further, the memory control unit 13 performs the above-described double buffer operation by switching the switch units 14 and 15 for each vertical synchronization signal.
As described above, in the present embodiment, for example, the memory control unit 13 outputs an address for controlling the write address of the frame memories 11 and 12 to the frame memories 11 and 12. An example is realized. For example, the memory control unit 13 outputs an address for controlling the read address of the frame memories 11 and 12 to the frame memories 11 and 12, thereby realizing the second instruction unit.

  Further, the memory control unit 13 outputs a control signal for controlling the operation of the switch units 14 and 15 to the switch units 14 and 15 based on a signal from the control unit 20 or the like. Thus, in the present embodiment, for example, the first output unit is realized by using the switch unit 15 whose operation is controlled by the memory control unit 13.

The address conversion unit 16 converts the write address generated by the memory control unit 13 into a desired address in a third display state to be described later.
In this embodiment, the case where the frame memories 11 and 12 are alternately written / read using the switch units 14 and 15 is described as an example, but the configuration is not necessarily limited thereto. For example, the same function (double buffer operation) can be realized by alternately controlling the chip select signals of the frame memories 11 and 12. In the present embodiment, the case where the frame memories 11 and 12 are independent memories has been described as an example, but the present invention is not necessarily limited to this configuration. For example, one frame memory having a storage capacity for at least two screens is provided with an independent two-screen address space as an internal address space, and writing / reading is time-divided with respect to this one frame memory. You may make it control by.

The control unit 20 is connected to the external operation IF 40, the image drawing unit 31, the memory control unit 13, the timing generator 17, and the address conversion unit 16. Each control unit 20 is operated by an operation from the external operation unit 70 through the external operation IF 40. Perform block control. Further, the control unit 20 controls the display state of the display unit 10 (display device 18) to any one of the first display state to the third display state based on the operation of the external operation unit 70. Here, the first display state is a display state in which image data generated by the image drawing unit 30 is sequentially displayed (normal display) as it is. The second display state is a display state in which the entire screen of the display device 18 is “frozen”. The third display state is a display state in which a part of the image data generated by the image drawing unit 30 is displayed at an arbitrary position and “freeze” is performed at other positions.
Here, as the external operation unit 70, for example, a mouse, a keyboard, or an operation panel provided in the image display system can be used.

The image drawing unit 30 has a function equivalent to that of a PC. For example, the image drawing unit 30 executes application software to generate image data for displaying a presentation screen. Then, the image drawing unit 30 sends the generated image data and the synchronization signal to the display unit 10 and the external monitor IF 50 via a common signal line. Note that the user can instruct execution of processing in the application software via the external operation IF 40 and the control unit 20 by operating the external operation unit 70.
As described above, in the present embodiment, for example, the image drawing unit 30 generates image data, thereby realizing an example of a generation unit.
The external monitor IF 50 is for sending the image data sent from the image drawing unit 30 and the synchronization signal to the outside and using the external monitor 60 as a sub-monitor for the display unit 10. In the present embodiment, the external monitor 60 serves as a sub display (sub display device). In the following description, the display device 18 is referred to as a main display 18 and the external monitor 60 is referred to as a sub display 60 as necessary.
As described above, in the present embodiment, for example, the second output unit is realized by the external monitor IF 50 sending image data to the external monitor 60.

Next, an example of the operation of the image display system will be described with reference to FIGS.
FIG. 2 is a diagram showing an example of the display state of the main display 18 and the sub display 60 in the first display state. FIG. 2A shows the display state of the main display 18, and FIG. The display state of the sub display 60 is shown. In FIG. 2, the main display 18 and the sub display 60 display the same image data. In the present embodiment, it is assumed that the main display 18 and the sub display 60 have the same resolution of 1920 horizontal pixels and 1200 vertical pixels. However, the resolution of the sub display 60 is not necessarily the same as that of the main display 18. For example, if the sub-display 60 has a resolution conversion function, display according to the resolution of the sub-display 60 can be performed.

  Here, the user displays an area (second area) 102 that is not “frozen” when the third display state is set, and an area (first area) 101 that is inserted into the second area 102 and displayed (FIG. 2). This is set in the first display state as shown in FIG. In the present embodiment, the application software executes a predetermined process, so that the image display system enters an area setting mode in which the first area 101 and the second area 102 are set. In this area setting mode, when the user operates the external operation unit 70, the first area 101 and the second area 102 are set for the control unit 20 via the external operation IF 40. As described above, in the present embodiment, for example, the control unit 20 acquires and stores information indicating the setting contents of the first area 101 and the second area 102, thereby realizing an example of a setting unit.

In FIG. 2, as the first area 101, a rectangular area having the coordinates (1440, 1020) and the coordinates (1920, 1200) as diagonal vertices is set. In addition, as the second region 102, a rectangular region having the coordinates (900, 240) and the coordinates (1380, 420) as diagonal vertices is set. Here, the size of the first area 101 is equal to the size of the second area 102 so that the image data of the first area 101 can be displayed in the second area 102. Accordingly, the setting information of the first area 101 and the second area 102 is information obtained by combining three or four parameters out of the following six parameters. That is, two coordinates at the diagonal position of the first area 101, two coordinates at the diagonal position of the second area 102, the number of horizontal pixels and the number of vertical pixels of the first and second areas 101 and 102 The information is a combination of three or four of the six parameters. For example, the start point coordinates (coordinates (1440, 1020)) and end point coordinates (coordinates (1920, 1200)) of the first area 101 and the start point coordinates (coordinates (900, 240)) of the second area 102 are set as setting information. can do. Also, for example, the start point coordinates (coordinates (1440, 1020)) of the first region 101, the start point coordinates (coordinates (900, 240)) of the second region 102, and the horizontal pixels of the first and second regions 101, 102 The number and the number of vertical pixels can be used as setting information.
As described above, in the present embodiment, the first region 101 and the second region 102 are set in advance before the display state is shifted to the third display state described below.

FIG. 3 shows the main display 18 and the sub display 60 when the display state is shifted from the first display state shown in FIG. 2 to the third display state and the image data generated in the image drawing unit 31 is updated. It is a figure which shows an example of a display state. Specifically, FIG. 3A shows the display state of the main display 18, and FIG. 3B shows the display state of the sub display 60.
The main display 18 displays the image data of the first area 101 set in the first display state among the image data 200 before being controlled to the third display state and the current image data 300 in the second area 102. Insert and display. That is, the same image as that displayed in the first area 101 of the sub-display 60 shown in FIG. 3B is displayed in the second area 102 of the main display 18 shown in FIG. On the other hand, the current image data 300 is displayed on the sub-display 60, and the image in the first area 101 of the sub-display 60 is a part of the current image data 300.

In the third display state, the address conversion unit 16 converts the write address generated by the memory control unit 13 into a desired write address using the setting information (parameter) set in the first display state. That is, the address conversion unit 16 compares the x-coordinate and y-coordinate of the first area 101 set in the first display state with the x-coordinate and y-coordinate of the second area 102, respectively, and determines the address conversion coefficient fx. , Fy are prepared. In the example shown in FIG. 2, fx = −540 and fy = −780 are prepared as address conversion coefficients. Then, the address conversion unit 16 calculates desired write addresses Xadr ′ and Yadr ′ using the following equations (1) and (2).
Xadr '= Xadr + fx (1)
Yadr ′ = Yadr + fy (2)
Here, Xadr and Yadr are write addresses generated by the memory control unit 13.
At the same time, the memory control unit 13 enables the write data in the frame memories 11 and 12 only when the write addresses Xadr and Yadr generated by the memory control unit 13 are addresses corresponding to the first area 101. On the other hand, the memory control unit 13 disables the write data when the write addresses Xadr and Yadr are addresses that do not correspond to the first area 101.

That is, when the write addresses Xadr and Yadr generated by the memory control unit 13 are addresses corresponding to the first area 101, the write addresses of the frame memories 11 and 12 are changed to addresses corresponding to the second area 102 by the address conversion unit 16. It has been converted. Accordingly, in the frame memories 11 and 12, only the image data in the second area 102 out of the image data 200 before being controlled to the third display state is the image data in the first area 101 of the current image data 303. Updated and stored. On the other hand, in areas other than the second area 102 in the frame memories 11 and 12, the image data 200 before being controlled to the third display state is stored as it is. In this way, the memory control unit 13 displays the part of the image data generated by the image drawing unit 30 at an arbitrary position by performing the reading operation from the frame memories 11 and 12 as usual without changing in particular. A third display state that “freezes” other than the position is realized.
As described above, in the present embodiment, for example, the address conversion unit 16 realizes an address conversion unit by performing the calculations of the expressions (1) and (2). Further, for example, when the write address is an address that does not correspond to the first area 101 which is an example of the first area, the prohibiting unit is realized by the operation of the memory control unit 13 for disabling the write data.

FIG. 4 is a diagram illustrating a specific example of the display state of the main display 18 and the sub display 60 in the third display state. Specifically, FIG. 4A shows the display state of the main display 18, and FIG. 4B shows the display state of the sub display 60.
As shown in FIG. 4B, when “12” is written in the first area 101 of the sub-display 60 in the third display state, as shown in FIG. A writing display of “12” is made in the two areas 102. In the present embodiment, this writing is performed based on, for example, a user operation of the external operation unit 70.

FIG. 5 shows the display states of the main display 18 and the sub display 60 when the second region is newly set for the current image data 300 displayed on the sub display 60 in the third display state. It is a figure which shows a specific example. Specifically, FIG. 5A shows the display state of the main display 18, and FIG. 5B shows the display state of the sub display 60.
When the user performs a predetermined operation on the external operation unit 70 in the third display state in order to set the new second area 103 as shown in FIG. 5, the image display system displays the third display area 103. Transition from state to area setting mode. Then, the main display 18 enters the second display state, that is, the full screen “freeze”. Then, when the user operates the external operation unit 70, a new second area 103 is set for the control unit 20. In the example shown in FIG. 5, a rectangular area having the coordinates (1440, 480) and the coordinates (1920, 660) as diagonal vertices is set as the new second area 103.

  Thereafter, when the display state shifts from the third display state to the first display state, the current image data 300 shown in FIG. 5B is displayed on the main display 18. Then, when the display state shifts again from the first display state to the third display state, the content written in the first area 101 of the sub display 60 corresponds to the new second area 103 in the main display 18. Displayed in position.

  As described above, in this embodiment, the address conversion unit 16 sets the write addresses of the frame memories 11 and 12 to the second area when the write addresses Xadr and Yadr generated by the memory control unit 13 are the addresses of the first area 101. The address is converted to an address corresponding to 102. At this time, the memory control unit 13 validates the write data in the frame memories 11 and 12 only when the generated write addresses Xadr and Yadr are addresses corresponding to the first area 101. Therefore, it is possible to arbitrarily set a display area (second area 102) that is not “frozen” on the screen of the main display 18 that has been “frozen” without greatly changing the operation of the memory control unit 13. It is. In addition, the “first area 101 of the sub display 60”, which is a writing area of an image to be displayed in a display area that is not “frozen”, can be arbitrarily set. That is, the position of the display area (second area 102) that does not “freeze” on the main display 18 and the “first area 101 of the sub display 60” that is the writing area of the image displayed in the display area that does not “freeze”. Can be different. Therefore, it is possible to prevent the image originally displayed on the sub display 60 from being disturbed by the display in the first area 101 of the sub display 60 as much as possible, and to effectively use the work area in the sub display 60. Can do.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment described above, the first area 101 and the second area 102 are set based on the user operation of the external operation unit 70. On the other hand, in the present embodiment, the first area 101 and the second area 102 are set based on a user instruction on the display screen of the main display 18. As described above, the present embodiment and the first embodiment are mainly different in a part of the method for setting the first region 101 and the second region 102. Therefore, in the description of the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals as those in FIGS.

FIG. 6 is a diagram illustrating an example of a schematic configuration of the image display system. In FIG. 6, the image display system of this embodiment has a configuration in which a coordinate input unit 25 is added to the image display system of the first embodiment shown in FIG.
The coordinate input unit 25 includes a coordinate detection surface that is substantially integrated with the display screen of the main display 18. The user directly designates the coordinate detection surface (display screen) using a pen or the like. Then, the coordinate input unit 25 sends the instructed coordinates to the control unit 20.
Accordingly, the settings of the first area 101 and the second area 102 described in the first embodiment can be set intuitively on the main display 18. As described above, in the present embodiment, for example, the coordinates input by the coordinate input unit 25 are acquired and stored by the control unit 20, thereby realizing an example of a setting unit.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the first and second embodiments described above, the content input to the first area 101 of the sub display 60 is displayed on the first area 101 of the sub display 60, and the displayed content is displayed on the second area of the main display 18. The case where the information is also displayed in the area 102 has been described as an example. On the other hand, in this embodiment, the content input to the second area 102 of the main display 18 is displayed in the first area 101 of the sub display 60, and the displayed content is displayed in the second area 102 of the main display 18. A case where the message is also displayed will be described as an example. As described above, the present embodiment is different from the first and second embodiments mainly in a part of the manner of display on the main display 18 and the sub display 60. Therefore, in the description of this embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals as those in FIGS.

FIG. 7 is a diagram illustrating an example of a schematic configuration of the image display system. 7, the image display system according to the present embodiment has a configuration in which a coordinate conversion unit 26 is added to the image display system according to the second embodiment illustrated in FIG. 6. However, the coordinate input unit 25 of the second embodiment is configured to send the coordinates instructed to the coordinate detection surface (display screen) to the control unit 20 in the first display state. On the other hand, in the present embodiment, the coordinate input unit 25 sends the coordinates instructed to the coordinate detection surface (display screen) to the coordinate conversion unit 26 in the third display state.
The coordinate conversion unit 26 converts the coordinates sent from the coordinate input unit 25 in the third display state into desired coordinates.

FIG. 8 is a diagram illustrating a specific example of the display state of the main display 18 and the sub display 60 in the third display state. Specifically, FIG. 8A shows the display state of the main display 18, and FIG. 8B shows the display state of the sub display 60.
In the third display state, the user inputs, for example, coordinates for writing an answer to the second area 102 of the main display 18 using an instruction unit such as the pen 400. At this time, the coordinate input unit 25 accepts “coordinates on the display screen” based on the instruction of the pen 400 and sends it to the coordinate conversion unit 26 only when there is an input to the second region 102.
As described above, the coordinate input unit 25 includes a coordinate detection surface that is substantially integrated with the display screen of the main display 18. Therefore, in this embodiment, for example, the coordinate conversion unit 26 uses the coordinate input unit 25 as an example of coordinate input means. Is realized. Further, for example, when the coordinate input unit 25 receives an input of the pen 400 for the second region 102, an example of a receiving unit is realized.
The coordinate conversion unit 26 converts the coordinates sent from the coordinate input unit 25 into desired coordinates using setting information (parameters) set in the first display state. The coordinate conversion coefficients fxp and fyp for converting the coordinates are equal in absolute value and opposite in sign to the "address conversion coefficients fx and fy used in the address conversion unit 16" described in the first embodiment. In the example shown in FIG. 2, fxp = + 540 and fyp = + 780 are prepared as coordinate conversion coefficients. Then, the coordinate conversion unit 26 calculates desired coordinates Xpoint ′ and Ypoint ′ using the following equations (3) and (4).
Xpoint '= Xpoint + fxp (3)
Ypoint '= Ypoint + fyp (4)
Here, Xpoint and Ypoint are the x-coordinate and y-coordinate sent from the coordinate input unit 25, respectively.
As described above, in the present embodiment, for example, the coordinate conversion unit 26 performs an operation of Expressions (3) and (4), thereby realizing an example of a coordinate conversion unit.
The control unit 20 instructs the image drawing unit 31 to generate drawing data based on the coordinates Xpoint ′ and Ypoint ′ based on the values of the coordinates Xpoint ′ and Ypoint ′. Then, the image drawing unit 31 generates drawing data based on the coordinates Xpoint ′ and Ypoint ′ based on this instruction. Here, the display state is the third display state. Therefore, as in the first embodiment, the address conversion unit 16 sets the write addresses of the frame memories 11 and 12 when the write addresses Xadr and Yadr generated by the memory control unit 13 are the addresses of the first area 101. The address is converted into an address corresponding to the second area 102. At this time, the memory control unit 13 validates the write data in the frame memories 11 and 12 only when the generated write addresses Xadr and Yadr are addresses corresponding to the first area 101. Therefore, an image based on the content input with the pen 400 is displayed in the first area 101 of the sub display 60, and the same image as that image is displayed in the second area 102 of the main display 18.

  As described above, in this embodiment, when there is an input in the second area 102 of the main display 18, the input coordinates are converted into the coordinates in the first area 101, and drawing data based on the converted coordinates is created. Then, the write addresses Xadr and Yadr generated by the memory control unit 13 become the addresses of the first area 101, so the address conversion unit 16 sets the write addresses of the frame memories 11 and 12 to the addresses corresponding to the second area 102. Convert to At this time, the write data in the frame memories 11 and 12 is valid only when the write addresses Xadr and Yadr are addresses corresponding to the first area 101. Therefore, the image data based on the input coordinates is written in the “address corresponding to the second area 102” converted by the address conversion unit 16. Accordingly, an image based on the input coordinates is displayed not only in the first area 101 of the sub display 60 but also in the second area 102 of the main display 18. Therefore, in addition to the effects described in the first and second embodiments, there is an effect that the image is displayed as if the drawing is performed on the frozen screen (main display 18).

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In the above-described third embodiment, the case where only one second region 102 is set has been described as an example. On the other hand, in this embodiment, a case where a plurality of second areas 102 are set will be described. Thus, the number of setting the second region 102 is mainly different between the present embodiment and the third embodiment. Therefore, in the description of the present embodiment, the same parts as those in the first to third embodiments are denoted by the same reference numerals as those in FIGS.

The schematic configuration of the image display system of the present embodiment is the same as that shown in FIG.
FIG. 9 is a diagram illustrating a specific example of the display state of the main display 18 and the sub display 60 in the third display state. Specifically, FIG. 9A shows the display state of the main display 18, and FIG. 9B shows the display state of the sub-display 60. FIG. 9A shows an example in which three second regions 102a, 102b, and 102c are set in the third display state.

  The display, address conversion related to coordinate input, and coordinate conversion in each of the plurality of second regions 102a, 102b, and 102c are as described in the third embodiment. Here, it is assumed that after the coordinate input is first performed in the second area 102a and the drawing is performed, the coordinate input by the pen 400 is performed in another second area 102b. Until then, the image data of the first area 101 was displayed in the second area 102a, and the input coordinates in the second area 102a were converted to the coordinates of the first area 101. However, when coordinate input is performed in another second area 102b, the image data displayed in the first area 101 is displayed in the second area 102b in which the latest input is performed, and the second area 102b. It operates so as to convert the input coordinates into the coordinates of the first region 101.

When the second area 102 displaying the image data of the first area 101 is changed from the second area 102a to the second area 102b, the image data drawn in the first area 101 is deleted and what is stored in the second area 102b. Is also not displayed. Here, when the second area 102 is changed from the second area 102a to the second area 102b, the image data displayed in the second area 102a is associated with the second area 102a according to an instruction from the control unit 20. Deleted after being stored in a separate storage medium. In this way, for example, when the coordinate input is moved again from the second area 102b to the second area 102a, the image data stored in association with the second area 102a is called and the first area 101 of the sub display 60 is recalled. It is possible to re-edit by displaying it in.
As described above, in the present embodiment, for example, the image data displayed in the second area 102a is stored in the storage medium in association with the second area 102a in accordance with an instruction from the control unit 20. An example is realized.

Next, an example of part of the operation of the image display system when a plurality of second regions 102 are set will be described with reference to the flowchart of FIG. Note that it is assumed that the first area 101 and the second areas 102a to 102c are set before the operation of the flowchart of FIG. 10 and an input operation has already been performed on the second area 102a.
First, in step S101, the control unit 20 shifts the display state to the third display state based on the operation of the external operation unit 70 or the like.
Next, in step S <b> 102, the control unit 20 determines whether or not to end the third display state based on the operation of the external operation unit 70 or the like. As a result of this determination, when the third display state is to be ended, the processing according to the flowchart of FIG. 10 is ended. Then, the display state is returned to the first display state (normal display).
On the other hand, if the third display state is not terminated, the process proceeds to step S103. In step S103, the control unit 20 determines whether or not there is a coordinate input to a second region (for example, the second region 102b) different from the second region 102a based on the information sent from the coordinate conversion unit 26. Determine. As a result of the determination, if there is no coordinate input to a second area different from the second area 102a, the process returns to step S102.

On the other hand, if there is a coordinate input to a second area different from the second area 102a, the process proceeds to step S104. In step S104, the control unit 20 instructs the image drawing unit 31 to store the drawing data in the second area 102a in the storage medium in association with the second area 102a.
Next, in step S <b> 105, the control unit 20 instructs the image drawing unit 31 to delete the drawing data in the first area 101. In addition, the control unit 20 instructs the memory control unit 13 to write (store) data based on coordinate input to a second area different from the second area 102a.

Next, in step S106, the control unit 20 determines whether there is drawing data stored in association with a second area (for example, the second area 102b) different from the second area 102a. As a result of this determination, if there is no drawing data stored in association with a second area different from the second area 102a, the process returns to step S102. In this case, the first area 101 of the sub display 60 is, for example, a blank display.
On the other hand, if there is drawing data stored in association with the second area different from the second area 102a, the process proceeds to step S107. In step S107, the control unit 20 instructs the image drawing unit 31 to generate image data that embeds the stored drawing data in the first area 101 of the sub-display 60. Then, the process returns to step S102.

Even when a plurality of second regions 102 are set as described above, the same effects as described in the third embodiment can be obtained.
2 to 5, 8, and 9, the broken-line rectangle is shown for convenience and may or may not actually exist.

(Other embodiments of the present invention)
Each means constituting the image display system and each step of the image display method in the embodiment of the present invention described above can be realized by operating a program stored in a RAM or ROM of a computer. This program and a computer-readable recording medium recording the program are included in the present invention.

  In addition, the present invention can be implemented as, for example, a system, apparatus, method, program, storage medium, or the like. Specifically, the present invention may be applied to a system including a plurality of devices. The present invention may be applied to an apparatus composed of a single device.

  The present invention includes a software program (in the embodiment, a program corresponding to the flowchart shown in FIG. 10) that directly or remotely supplies a software program that implements the functions of the above-described embodiments. The present invention also includes the case where the system or the computer of the apparatus is achieved by reading and executing the supplied program code.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention.

  In that case, as long as it has the function of a program, it may be in the form of object code, a program executed by an interpreter, script data supplied to the OS, or the like.

  Examples of the recording medium for supplying the program include a floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, and CD-RW. In addition, there are magnetic tape, nonvolatile memory card, ROM, DVD (DVD-ROM, DVD-R), and the like.

  As another program supply method, a browser on a client computer is used to connect to an Internet home page. The computer program itself of the present invention or a compressed file including an automatic installation function can be downloaded from the homepage by downloading it to a recording medium such as a hard disk.

  It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the present invention.

  In addition, the program of the present invention is encrypted, stored in a storage medium such as a CD-ROM, distributed to users, and key information for decryption is downloaded from a homepage via the Internet to users who have cleared predetermined conditions. Let It is also possible to execute the encrypted program by using the downloaded key information and install the program on a computer.

  Further, the functions of the above-described embodiments are realized by the computer executing the read program. In addition, based on the instructions of the program, an OS or the like running on the computer performs part or all of the actual processing, and the functions of the above-described embodiments can also be realized by the processing.

  Further, the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Thereafter, the CPU of the function expansion board or function expansion unit performs part or all of the actual processing based on the instructions of the program, and the functions of the above-described embodiments are realized by the processing.

  It should be noted that each of the above-described embodiments is merely a specific example for carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. . That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the 1st Embodiment of this invention and shows an example of schematic structure of an image display system. It is a figure which shows the 1st Embodiment of this invention and shows an example of the display state of the main display in a 1st display state, and a sub display. The 1st Embodiment of this invention is shown, and while changing a display state from a 1st display state to a 3rd display state, the image data produced | generated in an image drawing part are updated, the main display and a sub display It is a figure which shows an example of a display state. It is a figure which shows the 1st Embodiment of this invention and shows the specific example of the display state of the main display in a 3rd display state, and a sub display. The 1st Embodiment of this invention is shown, and when a 2nd area | region is newly set with respect to the present image data currently displayed on the sub display in a 3rd display state, a main display and a sub display are shown. It is a figure which shows the specific example of a display state. It is a figure which shows the 2nd Embodiment of this invention and shows an example of schematic structure of an image display system. It is a figure which shows the 3rd Embodiment of this invention and shows an example of schematic structure of an image display system. It is a figure which shows the 3rd Embodiment of this invention and shows the specific example of the display state of the main display in a 3rd display state, and a sub display. It is a figure which shows the 4th Embodiment of this invention and shows the specific example of the display state of the main display in a 3rd display state, and a sub display. 14 is a flowchart illustrating an example of part of the operation of the image display system when a plurality of second regions 102 are set according to the fourth embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display unit 11 and 12 Display device frame memory 13 Memory control part 14 and 15 Switch part 16 Address conversion part 17 Timing generator 18 Display device 20 Control part 30 Image drawing unit 31 Image drawing part 32 Image drawing frame memory 40 External operation IF
50 External monitor IF
60 External monitor 70 External operation unit

Claims (14)

Generating means for generating common image data to be displayed on the main display device and the sub display device;
A memory area capable of storing image data for at least one screen, and a memory for storing the image data generated by the generating unit;
First instruction means for instructing a write address of image data to the memory;
If the write address instructed by the first instruction means is an address corresponding to a preset first area on one screen, the address is set to a preset second area on one screen. Address conversion means for converting to an address corresponding to
Prohibiting means for prohibiting writing of image data to an address other than the address converted by the address converting means;
Second instruction means for instructing a read address of image data written in the memory;
First output means for outputting image data read from the memory based on an instruction from the second instruction means to the main display device;
An image display system comprising: a second output unit that outputs an image based on the image data generated by the generation unit to the sub display device.   2. The setting unit according to claim 1, further comprising: a setting unit configured to set the first area and a second area having the same size and different position as the first area based on a user operation. Image display system.   The setting unit sets the first region and the second region based on a user operation when the display unit is in a display state in which the address conversion unit and the prohibition unit are not operated. The image display system according to claim 2. The main display device includes coordinate input means integrated with a display screen;
Coordinate conversion means for converting coordinates input by the coordinate input means to the second area of the image displayed on the main display device into coordinates corresponding to the first area. The image display system according to claim 1, wherein: There are a plurality of the second regions,
The coordinate conversion means converts coordinates input to the second area where the latest input has been made by the user among the plurality of second areas into coordinates corresponding to the first area. The image display system according to claim 4. Storage means for storing image data based on coordinates input to the second area and the second area in association with each other in a storage medium;
The generation unit generates image data for displaying the image data in the first area when there is image data associated with the second area in which coordinates are input by the user. The image display system according to claim 5. When operating the address converting unit and the prohibiting unit, the receiving unit receives a coordinate input by the user only for the second area,
The image display system according to claim 4, wherein the coordinate conversion unit converts the coordinates received by the reception unit into coordinates corresponding to the first region. A generation step for generating common image data to be displayed on the main display device and the sub display device;
A first instruction step having a memory area capable of storing image data for at least one screen, and instructing a write address of the image data to a memory for storing the image data generated by the generation step;
When the write address instructed in the first instruction step is an address corresponding to a preset first area on one screen, the address is set to a preset second area on one screen. An address conversion step for converting to an address corresponding to
A prohibiting step for prohibiting writing of image data to an address other than the address converted by the address converting step;
A second instruction step for instructing a read address of image data written in the memory;
A first output step of outputting image data read from the memory based on an instruction in the second instruction step to the main display device;
A second output step of outputting an image based on the image data generated in the generation step to the sub display device.   9. The setting step of setting the first area and a second area having the same size and different position as the first area based on a user operation. Image display method.   The setting step includes setting the first area and the second area based on a user operation when the display state is such that the address conversion step and the prohibition step are not executed. The image display method according to claim 9, wherein: The main display device is a coordinate input step for inputting coordinates from coordinate input means integrated with a display screen;
A coordinate conversion step of converting the coordinates input by the coordinate input step with respect to the second region of the image displayed on the main display device into coordinates corresponding to the first region. The image display method according to claim 8, wherein: There are a plurality of the second regions,
In the coordinate conversion step, coordinates input to the second area where the latest input is made by the user among the plurality of second areas are converted into coordinates corresponding to the first area. The image display method according to claim 11. A storage step of storing the image data based on the coordinates input to the second area and the second area in association with each other in a storage medium;
The generation step generates image data for displaying the image data in the first area when there is image data associated with the second area in which coordinates are input by the user. The image display method according to claim 12. A reception step of accepting input of coordinates by the user only for the second region when the address conversion step and the prohibition step are performed;
The image display method according to claim 11, wherein the coordinate conversion step converts the coordinates received by the reception step into coordinates corresponding to the first region.

Images