JP2533890B2 - Screen control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a screen control method for a projection display device that optically enlarges and displays information created by a computer on a large screen.

[Technical background and conventional technology]

In order to provide effective presentations at various conferences and academic societies, a projection display device that enlarges and displays various media information such as characters, charts, graphs, images, and handwritten information on a large screen is an important support device. There is. Manuscripts used for these presentations tend to be created using electronic computers, and therefore projection display devices compatible with the display devices of electronic computers are desired. In addition, in this type of projection display device, handwritten characters and figures can be input for supplementary explanations by entering memos, pointing display of explanations, simultaneous parallel display of multiple screens, screen enlargement / reduction, screen scrolling, etc. It is important to have the screen control function for promoting the understanding of the explanation items. Further, providing a plurality of projection display devices and a plurality of screens to display related documents at the same time further facilitates the understanding of the explanation items and enables a more effective presentation.

Conventionally, a CRT (cathode ray tube) projection display is known as a projection display device for enlarging and displaying an original created by an electronic computer. This CRT projection display has RGB signals as interface signals, so it is compatible with computer display devices. Recently, a projection type liquid crystal display device using a transmissive liquid crystal display panel has been proposed (for example, Japanese Patent Application Nos. 61-232770 and 62-346).
32).

Japanese Patent Application No. 62-34631 is an example of a screen control method for a plurality of projection display devices (projectors). This configuration consists of a screen control device and a display control circuit with a video memory that is compatible with a plurality of projectors. The screen controller is a transparent tablet integrated with the display panel,
And a means for selecting a video signal from the display control circuit based on the coordinate data of the transparent tablet and displaying it on the display panel. Therefore, the screen of the display panel can be switched to the display of a predetermined projector using the transparent tablet, and the screens of the display panel and the projector corresponding to the selected video signal can be controlled. Therefore, there is an advantage that a single display-integrated transparent tablet can be used to control the screens of a plurality of projectors with good operability.

On the other hand, in order to perform color display, normally three memory planes are required for the red screen (R), green screen (G) and blue screen (B) in the video memory. However, a single memory plane is sufficient for black and white display.

Therefore, when using a display control circuit capable of color display to control, for example, a plurality of monochrome display projectors with limited display colors, the above screen control method requires display control circuits for the number of projectors. Therefore, there is a wasteful memory plane that is not used. Therefore, there is a drawback that the device becomes expensive.

[Object of the Invention]

An object of the present invention is to provide a screen control system for a projection display device, which can easily perform screen control of a presentation using a plurality of projection display devices without bothering with the progress of the description and is inexpensive. It is in.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides an RGB memory plane and an image display terminal for displaying information of the memory plane in an RG with an image display device having a video memory composed of a plurality of memory planes.
Each B has a means for selecting two memory planes from the memory planes, and one of the selected memory planes is always selected as a common memory plane, and the display of the common memory planes is performed. The screen control method is characterized by having a means for controlling the screen of another selected memory plane while monitoring the screen.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention.
In order to simplify the explanation here, R, and
The G and B memory planes have three surfaces, three projectors, and a keyboard is used as a means for selecting a projector for screen control.

The screen control method of the present invention is based on the graphic control circuit 1
And memory planes 2, 3 and 4 for RGB and serial-parallel conversion circuit 9
And projectors 14,15,16 and screens 17,18,19,
It comprises a keyboard 23 and a processing unit 24.

The graphic control circuit 1 is connected to a data line or an address control line of the processing unit 24, decodes a graphic command from the processing unit 24 (for example, drawing a character, drawing a straight line, a circle, etc., filling, etc.) to display data. Is generated and written in each memory plane (VRAM) 2, 3, 4 of the video memory. Each memory plane 2, 3, 4 is controlled by the address control line 5 from the graphic control circuit 1, and each data line 6, 7, 8 is controlled.
The display data is transferred via. Also, a sync signal group (horizontal, vertical sync, clock signal) 13 necessary for displaying the display data on the projector is generated and the display signal is output to the projector. In FIG. 1, the display data of the memory plane is input to the serial-parallel conversion circuit 9 via the data lines 10a, 11a, 12a, and the R signal 10b, the G signal 11b, B respectively.
Signals 12b are serially converted to projectors 14, 15, 16 respectively
Sent to Therefore, the projectors 14, 15, 16 optically enlarge the display data stored in the memory planes 2, 3, 4 respectively and display them on the screens 17, 18, 19 respectively.

Also, select the screen to control the screen, update / search the displayed document, enlarge / reduce the screen, scroll the screen,
Screen control such as pointing display of the explanation location is performed by instructing from the keyboard 23.

Next, how to control the screens of the three projectors by using the embodiment of the present invention will be described. Here, three related manuscript files A, B, C are files 20, 21, 2
Suppose that they are stored in 2 and displayed on screens 17, 18 and 19, respectively. First, the projector 14 is selected as a projector for screen control by the keyboard 23, and a screen control command (for example, a command for designating the display of “next page document” or the like) is input. The program on the processing unit 24 decodes the data from the keyboard, selects the document file A for screen control, and at the same time sends a predetermined graphic command to the graphic control circuit 1. The graphic control circuit 1 decodes the instruction from the processing unit 24, drives the address control line 5 so as to write the display data only in the memory plane 2, and outputs the next page image of the original file A on the file 20 to the data line 6. Write to the memory plane via. The display data of the memory plane 2 is serially converted into the R signal 10b by the serial / parallel conversion circuit 9 via the data line 10a.
Since the R signal 10b is input to the projector 14 together with the sync signal group 13, the screen of the screen 17 is updated to the image of the next page of the document file A. Other screen control commands are processed in the same manner.

Next, use projector 15 as the projector for screen control.
The case of selecting and controlling the screen of the document file B will be described. This is similar to the above, and the graphic control circuit 1
Drives the address control line 5 so as to write the display data only in the memory plane 3 and writes the image of the original file B on the file 21 to the memory plane 3 via the data line 7. Similarly, when controlling the screen of the document file C, the graphic control circuit 1 uses the memory plane 4
Only is selected and the image on the file 22 is written to the memory plane 4 via the data line 8.

Manuscript files A, B, C
However, when writing the display data to a certain memory plane, the graphic control circuit 1 does not select another memory plane. Therefore, since the display data of the non-selected memory planes does not change, the screens on the screens corresponding to these memory planes do not change.

Although the keyboard is used for selecting the projector for screen control and inputting the screen control command, it goes without saying that the same operation can be performed by any means such as a remote operation terminal having good operability.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a block diagram showing the configuration of the second embodiment of the present invention. To simplify the explanation here,
It is configured to use a video memory having memory planes of R, G, and B planes and two projectors.

The screen control method according to the present invention includes a graphic control circuit 1, R
GB memory planes 2, 3 and 4, serial-parallel conversion circuit 9, projectors 14 and 16, screens 17 and 19, and processor 24
And a screen control device 25. The components other than the screen control device 25 are the same as those in the first embodiment, and the description thereof will be omitted.

The screen control device 25 inputs a transparent coordinate input panel, for example, a transparent tablet 26, a control circuit 27 of the transparent tablet 26, a display signal (here, a G signal 11b) and a synchronization signal group 13 from the serial-parallel conversion circuit 9. And a display panel 28 for displaying an image. The display data of the memory plane 3 is constantly displayed on the display panel 28.

The transparent tablet 26 is installed on the display panel 28. The transparent tablet 26 is, for example, a pressure-sensitive tablet in which a pressure-sensitive conductive sheet is sandwiched between two transparent resistance sheets and the upper transparent resistance sheet is pressed with a pen 29 to bring the two transparent resistance sheets into contact with each other. Transparent tablet 26
The coordinate data detected by is set so that the point specified by the pen 29 and the point on the screen of the display panel 28 match. Also,
Screen control such as switching screen screens to be controlled, inputting handwritten characters / figures, updating / searching displayed manuscripts, enlarging / reducing screens, scrolling screens, pointing display of explanation points, etc. is provided by the screen control function on the transparent tablet 26. This is done by arranging the corresponding menu and selecting it with the pen 29. The coordinate data detected by the transparent tablet 26 is sent to the processing device 24 via the control circuit 27 and the data line.

Next, how to control the screens of the two projectors by using the embodiment of the present invention will be described. Here, it is assumed that two related types of original files A and B are stored in files 20 and 21 and are displayed on screens 17 and 19, respectively. First, a command menu on the transparent tablet 26 using the pen 29 (a menu for selecting the projector 14 as a projector for screen control and a screen control command, for example, a menu for specifying the display of the next page document)
Press. The coordinate data of the pressure point is sent to the processing device 24 via the control circuit 27. The program on the processor 24 decodes the coordinate data, selects the document file A for screen control, and at the same time sends a predetermined graphic command to the graphic control circuit 1. The graphic control circuit 1 decodes the instruction from the processing unit 24, drives the address control line 5 so as to write the display data to the memory planes 2 and 3, and outputs the next page image of the original file A on the file 20 to the data line 6. Write to memory planes 2 and 3 via Display data of memory planes 2 and 3 are data lines 10a and 11a
The serial-to-parallel converter circuit 9 serially converts the signal into an R signal 10b and a G signal 11b. Since the R signal 10b is input to the projector 14 together with the sync signal group 13, the screen of the screen 17 is updated to the image of the next page of the document file A. Similarly, G signal 11
Since b is input to the screen control device 25, the screen of the display panel 28 is also updated to the image of the next page of the document file A. Other screen control commands are processed in the same way and the screen
The same image is displayed on the screens of 17 and the display panel 28 of the screen control device 25.

Next, use the projector 16 as the projector for screen control.
The case of selecting and controlling the screen of the document file B will be described. Similarly to the above, when the predetermined command menu of the transparent tablet 26 is pressed using the pen 29, the graphic control circuit 1 drives the address control line 5 so as to write the display data to the memory planes 4 and 3. Then, the image of the original file B on the file 21 is written in the memory planes 4 and 3 via the data lines 8 and 7. Thus screen 1
The result of controlling the upper screen 9 is also displayed on the display panel 28 of the screen controller 25.

The above-described operation is appropriately repeated to describe the document files A and B. However, when controlling the image of the document file A, the graphic control circuit 1 does not select the memory plane 4. Therefore, the screen of the screen 19 displaying the document file B does not change.

〔The invention's effect〕

As is apparent from the above description, the present invention has the following effects. According to the present invention, a plurality of image display terminals for displaying information of a memory plane of a video memory are provided for each memory plane, and a predetermined memory plane is selected from the plurality of memory planes to display the screen of the corresponding image display terminal. The screen of a predetermined image display terminal is controlled by referring to the image display terminal that displays the information of the common memory plane by providing a means for performing the same screen control on the common memory plane that is always selected The method to do is.

With this configuration, when a plurality of monochrome projectors are connected to an image display device having a video memory capable of color display and a plurality of originals are simultaneously displayed on the screen,
There is no need to add a video memory or graphic control circuit. Further, the screen control of the screen can be performed by one screen control device.

Therefore, if this method is used for presentations such as various conferences and presentations, there is an advantage that the understanding of the explanation items can be further promoted and a more effective presentation system can be realized at low cost.

Furthermore, since the screen control device uses a display panel equipped with a transparent coordinate input panel, control of the screen screen (switching the screen screen to control, inputting handwritten characters, figures, or pointing display, screen enlargement /
You can quickly perform (reduction, scrolling, etc.) by pointing with the pen or finger while looking at the display panel. Therefore, according to the present invention, it is possible to promote the understanding of the contents in various presentations without interrupting the explanation, and it is possible to provide a more effective presentation system with extremely good operability.

Furthermore, if a projection type liquid crystal display device using a transmissive liquid crystal display panel is used for the projector, an extremely inexpensive presentation system can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention. FIG. 2 is a block diagram showing a second embodiment of the present invention. 1 ... Graphic control circuit, 2, 3, 4 ... Memory plane, 5 ... Address control line, 6, 7, 8 ... Data line, 9 ... Serial / parallel conversion circuit, 10a, 11a, 12a ... Data Line, 10b ... R signal, 1
1b …… G signal, 12b …… B signal, 13 …… Sync signal group, 14, 15,
16 …… Projector, 17,18,19 …… Screen, 20,21,22
...... Image file, 23 ...... Keyboard, 24 ...... Processing device, 2
5 …… Screen control device, 26 …… Transparent tablet, 27 …… Control circuit, 28 …… Display panel, 29 …… Pen.

Claims (1)

(57) [Claims] 1. An image display device having a video memory comprising a plurality of memory planes, wherein an RGB memory plane and an image display terminal for displaying information of the memory plane are RGB
A means for selecting two memory planes from among the memory planes, and one of the selected memory planes is always selected as a common memory plane, and a display screen of the common memory plane A screen control method comprising means for controlling the screen of another selected memory plane while monitoring the.