JP2003177909A - Data processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To expand a use range by displaying mutually different contents on a 1st display unit provided to a device main body and a 2nd display unit externally connected to the device main body. <P>SOLUTION: A data processor comprises the device main body 1 having an LCD display unit 3, a CRT display unit 100 which can display the same contents with the LCD display unit 3 of the device main body 1, and a permission/inhibition control circuit 14 and when the contents displayed on the LCD display unit 3 of the device main body 1 are also on the CRT display unit 100, the permission/inhibition control circuit 14 inhibits the contents displayed on the CRT display unit 100 from being updated. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing device provided with an interface for connecting an external display device. 2. Description of the Related Art For example, a notebook PC (Personal C)
omputer) has an LCD
A display device is provided, and the LCD display device generally performs gradation display. In this case, since the LCD display device is inferior in display quality to the CRT display device, the notebook PC is generally provided with an interface for connecting the CRT display device. [0006] However, as shown in FIG. 6, one display buffer 5 is provided in the main body 1 of the apparatus.
Is provided, when the CRT display device is externally connected, no display is performed on the LCD display device.
Since only the same display contents as those displayed on the T display device are displayed, there is a problem that the range of use (application, location, etc.) is narrowed and limited. SUMMARY OF THE INVENTION It is an object of the present invention to provide a first display device provided in a main body of a device and a second display device externally connected to the main body of the device. An object of the present invention is to provide a processing device. In order to achieve the above object, a data processing apparatus according to the first aspect of the present invention has a device main body having a display means, and a display means of the device main body (a first display device).
A display means (second display device) capable of displaying the same contents as the above and a screen switching means, and the contents displayed on the display means of the apparatus main body are also displayed on the auxiliary display means. At the same time, updating of the contents displayed on the auxiliary display means by the screen switching means is prohibited. In the data processing device according to the present invention, the first display device and the second display device are different from each other. The contents are displayed. A preferred embodiment of the data processing apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 shows an example when the data processing apparatus of the present invention is used. As shown in FIG. 1, an apparatus main body (for example, a notebook PC) 1 is provided with an LCD display device (first display device) 3 and a CRT display device (second display device) 100 as an external display device. / F connector (described later), cable 300
Is connected to the apparatus main body 1 via the. FIG. 2 shows an electrical configuration of the data processing device. As shown in FIG. 2, the apparatus main body 1 includes a CPU 1A, a drawing control circuit 1B, and a display control circuit 1C (the first display controller). In addition, a first display buffer 5 used for display on the LCD display device 3 is provided, and C
A control circuit 200 for performing display on the RT display device 100 and the second display buffer 11 are provided. The control circuit 200 includes the second display control circuit 7 and the switch circuit 9. The drawing control circuit 1 is controlled by a command from the CPU 1A.
B, the content of the first display buffer 5 is rewritten,
The contents are transferred to the LCD display device 3 by the display control circuit 1C and displayed. FIG. 3 shows the details of the circuit configuration of the control circuit 200. Output signal from the device body 1 (the same signal as the signal input to the LCD display device 3)
Among them, the synchronization signal is input to the display timing signal generation circuit 2, while the data signal is input to the buffer memory interface 4. A timing clock generation circuit 6 is connected to the display timing signal generation circuit 2. The timing clock generation circuit 6 includes a buffer control signal generation circuit 8 and a write address counter 1.
0, the display address counter 12 is connected. The buffer control signal generation circuit 8 is connected to the second display buffer 11 via a read signal line, and is connected to the permission / prohibition control circuit 14.
The write address counter 10 and the display address counter 12 are connected to a multiplexer 16 via a signal bus. The multiplexer 16 is connected to the second display buffer 11 via an address bus. The buffer memory interface 4 is connected to the second display buffer 11 via a data bus. Is connected via
The CPU 30 and the switch circuit 9 are connected to the prohibition control circuit 14. The data bus of the second display buffer 11 is connected to the buffer memory interface 4 and a latch circuit 18. The latch circuit 18 is connected to an external display interface 20 (I / F connector), and a timing clock generation circuit. 6 is connected to the interface 20, and the CRT display device 100 is connected to the interface 20. Next, the operation of the second display control circuit 200 will be described. The display timing signal generation circuit 2 includes a buffer control signal generation circuit 8, a write address counter 10, and a display address counter 1.
2 is generated by the timing clock generation circuit 6. In the write address counter 10, in order to write the output data from the first display controller to the second display buffer 11, the address counter is operated in accordance with the timing of the output data. At 8, a chip select for the second display buffer 11 and a write signal are generated. Further, in the display address counter 12,
In consideration of the request timing of the CRT display device 100, an address for reading the contents of the second display buffer 11 is generated by data writing to the second display buffer 11 and time division, and at the same time, a buffer control signal generation circuit At 8, a chip select and read signal for the second display buffer 11 are generated. The addresses output from the write address counter 10 and the display address counter 12 are switched by the multiplexer 16 in accordance with the timing of writing / reading to / from the second display buffer 11 and the output of the multiplexer 16 is switched to the second display buffer. 11 addresses. On the other hand, the buffer memory interface 4
When data is input from the first display controller, data is output to the data bus of the second display buffer 11 at the time of writing, but is not output at the time of reading. At the time of reading, the second
The data in the display buffer 11 is latched, and the latched data is converted into a data type required by the CRT display device 100 by the interface 20 and output. At the same time, a synchronization signal is output from the timing generation circuit 22. With the above operation, when the chip select and the write signal are output at the timing when the writing is permitted under the control of the permission / inhibition control circuit 14 and the writing is performed, the signal from the first display device, that is, the LCD display device 3 is displayed in the CR via the second display buffer 11.
The data is transferred to the T display device 100 and displayed. On the other hand, if the writing is prohibited by the control of the permission / inhibition control circuit 14, the chip select and write signals do not become active at the time of writing, so that the data input from the first display controller is the second data. It is no longer written to the display buffer 11. As a result, the second display buffer 11 holds the data before the writing is inhibited, so that the contents of the first display buffer 5 change and the LCD
Even if the display content of the display device 3 changes, the CRT display device 1
At 00, the data held in the second display buffer 11 is displayed. When writing is permitted under the control of the permission / inhibition control circuit 14, the contents of the second display buffer 11 become the same as the contents transferred to the LCD display device 3 after 1/70 seconds. , The same contents are displayed on the CRT display device 100 and the LCD display device 3. The control of the permission / prohibition control circuit 14 is controlled by the user with the switch circuit 9 or controlled by the CPU 1A of the apparatus main body 1 via the CPU 30. That is, the permission / inhibition control circuit 14 is controlled by the CPU 1A of the apparatus main body 1.
Is controlled, the user does not need to operate the switch circuit 9, and when the apparatus is used in, for example, a presentation, there is an advantage that all display contents can be programmed in advance. Also, in a presentation or the like, in order to answer an unexpected question, it is necessary to search for necessary display contents. In the absence state, the display contents are searched while looking at the LCD display device 3,
When the data is found, the display on the CRT display device 100 is permitted to be shown to a third party, and permission and prohibition can be performed by the switch circuit 9, so that the usability is excellent. Further, since the switch circuit 9 is switched as needed, there is an advantage that software required for driving the apparatus main body 1 may be a conventional one. In this embodiment, it is assumed that necessary data is stored in a storage unit of the apparatus main body 1 in advance by a spreadsheet, a word processor, or the like. Further, the first display controller sends an LCD
Synchronous with the timing required by the display device 3 (normally, data of the entire screen is output at a frame frequency of about 70 Hz, that is, once every 1/70 second, and the data output is performed irrespective of a change in display content). A signal and a data signal are output. Since the data processing apparatus of the present invention is configured as described above, it can be used not only at one fixed place but also at a place desired by a user (operator). For example, a presentation can be made by bringing the device to the customer as a sales tool, and the salesman can operate while looking at the LCD display device 3 and can provide the customer with an externally connected color TFT liquid crystal display device (second display device). ) Can be used. In this case, the secret matter can be displayed only on the LCD display device 3 and not shown to the customer. In some presentations, OHP
(Overhead projector) is externally connected to the data processing device of the present invention as a second display device.
The explanation can be made while looking at the CD display device 3. In this case, although it is necessary for the explanation, data that does not need to be particularly displayed on the OHP is displayed on the LCD display device 3 only, so that the explanation can be made more simply. in this way,
The data processing device of the present invention is suitably used when the contents displayed on the LCD display device 3 and the second display device are different. Next, an example of the operation of the data processing apparatus of the present invention will be described by specifically showing the contents displayed on the LCD display device 3 and the CRT display device 100. In FIG. 4, the display screen of the LCD display device 3 is on the left side in the figure, and C
The display screen of the RT display device 100 is shown, and writing permission or prohibition to the second display buffer 11 is determined by the CPU.
This is performed by software at 30 or operation of the switch circuit 9. When the writing is permitted, both display screens have the same display content A (procedure S1 in FIG. 5). Next, when writing is prohibited (procedure S
2) Even if the display content of the LCD display device 3 is changed to B (procedure S3), the display content of the CRT display device 100 remains A. Therefore, when giving a presentation,
While the presenter is watching the LCD display device 3, the CRT
If the display device 100 is shown to a viewer, when the data B is required for explaining the display content A, the CR
The display content of the T display device 100 is left as A, and only the presenter can see the data B on the LCD display device 3 (step S4). When the explanation of the display content A is completed,
The display content is changed to C (step S5).
Writing to the display buffer 11 is permitted (procedure S
6) Both display screens have the same display content C. In addition,
Before displaying the display content C on the CRT display device 100, it is also preferable to temporarily display the content on the LCD display device 3 and confirm the content. By repeating such an operation (step S7), a desired presentation can be performed efficiently. As described above, in this embodiment, L
Different display contents A and B are displayed on the CD display device 3 and the CRT display device 100, respectively.
0 to a third party, data that the third party does not want to see, and supplementary data of the data that the third party is showing.
Can be displayed only on. Therefore, the usable range of the notebook PC is expanded, for example, the notebook PC can be used for a presentation. The device body 1
CPU 1A and CP of the second display control circuit 200
Since the U30 is provided, a consistent flow of the presentation can be programmed in advance, so that even a user unfamiliar with the operation of the notebook PC can easily use the notebook PC. Further, since the display content of the CRT display device 100 which is viewed by the third party is controlled by the switch circuit 9, when an unexpected question is issued by the third party,
Appropriate data can be displayed on the LCD display device 3 and searched without being seen by a third party. In addition, LC
Since the presentation can be performed using the conventional software required for the D display device 3, there is no need to prepare a new program, and the usability is excellent. As will be understood from the above description, in the data processing device according to the present invention, different contents are displayed on the first display device and the second display device by the display means.
Therefore, in response to the user's convenience, the device can be used, for example, by displaying data necessary for presentation on the first display device and not displaying inconvenient contents on the second display device viewed by a third party. There is the advantage that the range is expanded.
Also, permission or prohibition of rewriting of the display buffer of the second display device is instructed by the rewriting permission prohibiting means, and the instruction is processed by software, for example, so that even a user unfamiliar with the operation of the device can easily use the device. There is an advantage that you can. Since the display contents of the second display device viewed by the third party can be controlled by operating a predetermined switch, for example, when an unexpected question is issued by the third party, , It is possible to search while displaying appropriate data on the first display device. Further, since the rewriting permission prohibiting means is controlled by the CPU of the apparatus main body, the presentation can be performed by using the software conventionally used in the apparatus main body, and there is an advantage that it is not necessary to separately prepare a program for the presentation. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view of a data processing device according to a preferred embodiment of the present invention in use. FIG. 2 is a block diagram showing an electrical configuration of the data processing device. FIG. 3 is a block diagram showing an electrical configuration of a main part of the data processing device of the present invention. FIG. 4 is an explanatory diagram showing a specific example of display contents respectively displayed on the LCD display device and the CRT display device. FIG. 5 is an explanatory diagram showing a procedure for switching display contents in a presentation. FIG. 6 is an explanatory diagram of an electric configuration of a conventional node book PC. [Description of Signs] 1: Device main body, 1A: CPU, 1B: Drawing control circuit, 1C: Display control circuit, 2: Display timing signal generation circuit, 3: LCD display device (first display device), 4: Buffer memory Interface, 5: first display buffer, 7: second display control circuit, 8:
Buffer control signal generation circuit, 9: switch circuit, 10:
Write address counter, 11: second display buffer, 12: display address counter, 14: enable / disable control circuit, 20: external display device interface (I /
F interface), 30: CPU, 100: CRT display device, 200: second display control circuit, 300:
Cable, A, B, C: display contents.

Claims (1)

Claims 1. An apparatus main body having a display means, an auxiliary display means capable of displaying the same contents as the display means of the apparatus main body, and a screen switching means. Wherein when the content displayed on the display means is also displayed on the auxiliary display means, updating of the content displayed on the auxiliary display means by the screen switching means is prohibited. Processing equipment.