JP2760522B2 - Display control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a display control device that performs drive control of display devices having different resolutions.

(Prior Art) In general, display devices such as personal computers, workstations, word processors, and the like using a CRT are widely used due to their advantages such as resolution, display quality, multicolor display, and cost. Although this CRT has the disadvantage that it occupies a large area due to its unique shape, it also has the above-mentioned advantages, especially when it comes to stationary electronic devices whose occupation area is relatively unrestricted. It seems that the one used for the display device will continue to be the mainstream in the future.

On the other hand, when the importance of portability such as a laptop personal computer, which occupies a large factor, is emphasized, a flat panel display device such as a liquid crystal display device, plasma, or LE is used. There are few things that dispel the superiority of. In this case, the most problematic point is the resolution. Many application programs that use a display device are created with some consideration of the resolution of the display device, but use a flat panel display device while maintaining compatibility with the interface of the application program that uses the display device. In such a case, a process of reducing the resolution by resolution conversion is required.

(Problems to be Solved by the Invention) However, when the resolution is reduced, the reduction ratio of character display such as characters and the graphic display often do not match. That is, in character display, a dot font is often used, and the size of the dot font is typically 16 × 16 dots, 24 × 24 dots, for example.
It is common to use what is determined as a dot, and when reducing it, the size of the dot font is reduced. On the other hand, in the graphic display, the reduction ratio is generally reduced at the same reduction ratio in both the X direction and the Y direction for each display device having an arbitrary resolution so that no distortion occurs in the XY direction. As described above, since the reduction ratio does not match between the character display and the graphic display due to the respective circumstances, the display data for the CRT in which the character display and the graphic display are displayed with a correlation is reduced in resolution and the flat panel display device as it is. In some cases, the image is displaced when displayed on the screen.

The present invention has been made in view of the above circumstances,
A display control device that can match the display data for CRT with correlation between character data and graphic data to one of the resolutions, reduce the resolution, and display it on a flat panel display device without any deviation The purpose is to provide.

[Configuration of the Invention] (Means and Actions for Solving the Problems) The present invention provides a code memory for storing character display code data and a graphic memory for storing graphic display image data corresponding to the resolution of the first display device. A display control device for sequentially reading the storage contents of these memories, performing resolution conversion, and synthesizing and displaying on a second display device having a different resolution from the first display device, When the resolution conversion ratio of the graphic display is different from the resolution conversion ratio of the graph display, one of the X-direction and Y-direction resolution conversion of the graphic display image data stored in the graphic data memory and corresponding to the resolution of the first display device. A first solution that matches the ratio with the character's resolution conversion ratio and converts both the X and Y directions at the conversion ratio The degree conversion means, and when the resolution conversion ratio of the character display is different from the resolution conversion ratio of the graph display, the X direction of the graphic display image data stored in the graphic data memory and corresponding to the resolution of the first display device. And a second resolution conversion means for matching both the Y and Y directions to the resolution conversion ratio of the character. The output of the first and second resolution conversion means is switched and selected according to the display data configuration of the program used. Even if the CRT display data has a correlation between the character data and the graphic data, the resolution is reduced by matching one of the resolutions without causing a shift between the character data and the graphic data. It can be displayed on a flat panel display device.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows the background of the system configuration.
Is a host computer including the display control device of the present invention;
Is a first display terminal using a CRT, for example, and 3 is a second display terminal using a flat panel display device such as a liquid crystal display device.
Is a display terminal.

Originally, display data consisting of correlated character display data and graphic display data is stored in the host computer 1 as display data for the first display terminal 2 of high resolution, and this display data is stored in the first computer. When it is desired to display on the second display terminal 3 having a low resolution instead of the display terminal 2, the host computer 1 reduces the resolution of the display data and outputs the data to the second display terminal 3 for display.

FIG. 1 mainly shows a configuration of a display control device provided in the host computer 1. Reference numeral 11 denotes a display control unit for generating a refresh memory address, a raster address, a synchronization signal, and the like of display data, and 12 denotes an ANK code. , A code data refresh memory storing character display code data such as kanji codes, 13 is a character generator storing display character fonts corresponding to the code data read from the code data refresh memory 12, and 14 is a character generator 13 An OR circuit that performs an OR addition of the output of the multiplexer 18 and an output of the multiplexer 18 described later, 15 is a graphic data refresh memory storing graphic data such as a circle and a straight line, and 16 is a graphic data output from the graphic data refresh memory 15. On the other hand, in the X direction The first resolution converter for performing reduction reduction ratio and reduction ratio of the Y direction resolution Zodo as the same, 17 graphic data refresh memory
A second resolution conversion unit for reducing the graphic data output from 15 at a reduction ratio that matches the reduction ratio of the display resolution of the code data, and 18 is the first resolution conversion unit 16 or the second resolution conversion unit. A multiplexer for selecting one of the outputs of the unit 17 and sending it to the OR circuit 14; 19, storing code data in the code data refresh memory 12, storing graphic data in the graphic data refresh memory 15, and controlling the display control unit 11. It is a main processor unit that performs operation control, switching selection control of the multiplexer 18, and the like.

In the above configuration, character code data, ruled lines, blanks, inverted display attribute data, etc. to be displayed on the first display terminal 2 are stored in the code data refresh memory 12 in accordance with a command from the main processor unit 19, and Then, vector display data, images, characters with vector attributes, and the like are stored in the graphic data refresh memory 15 having a bitmap structure. The display control unit 11 generates a memory address, a raster address, a synchronization signal, and the like so that the data in the code data refresh memory 12 and the graphic data refresh memory 15 are sequentially read and displayed on the first display terminal 2.

When the character code read from the code data refresh memory 12 is input to the character generator 13, the character generator 13 generates a dot image according to the raster address and outputs the dot image to the OR circuit 14.

On the other hand, the graphic data refresh memory 15 reads the graphic data as the display data of the bitmap image based on the memory address and the raster address from the display control unit 11, and outputs the read data to the first resolution conversion unit 16 and the second resolution conversion unit 17. . As described above, the first resolution converter 16 reduces the graphic data with the X-direction resolution reduction rate and the Y-direction resolution reduction rate being the same, and sends the output to the multiplexer 18. The second resolution conversion unit 17 also reduces the graphic data at a reduction ratio that matches the reduction ratio of the display resolution of the character data of the second display terminal 3 with respect to the first display terminal 2 and outputs the reduced data. To the multiplexer 18. The multiplexer 18 receives the instruction from the main processor unit 19 and outputs the first resolution conversion unit 16
The output of the second resolution converter 17 is selected and the OR circuit 14 is selected.
To send to.

The OR circuit 14 OR-adds the dot image from the character generator 13 and the graphic data from the multiplexer 18 and supplies the result to the first display terminal 2 to display display data in which character data and graphic data are mixed.

Multiplexer 18 of main processor unit 19
Is selected according to the program to be used. When the character display data and the graphic display data are displayed in correlation, the output of the second resolution conversion unit 17 is output. When only the display data is displayed independently, the output of the first resolution converter 16 is selected.

[Effects of the Invention] As described above in detail, according to the present invention, a code memory for storing character display code data and a graphic memory for storing graphic display image data corresponding to the resolution of the first display device are provided. A display control device for sequentially reading out the stored contents of these memories, performing resolution conversion, and displaying a composite display on a second display device having a different resolution from the first display device, wherein a character display resolution conversion ratio When the resolution conversion ratio of the graphic display is different from the resolution conversion ratio of the graphic display, one of the resolution conversion ratios in the X direction and the Y direction of the graphic display image data corresponding to the resolution of the first display device stored in the graphic data memory is determined. Match the resolution conversion ratio, X direction and Y
A first resolution conversion means for converting both directions at the conversion ratio; and a first display device stored in the graphic data memory when the resolution conversion ratio for character display and the graph display resolution conversion ratio are different. X direction and Y of graphic display image data corresponding to resolution
Second resolution conversion means for matching the direction to the resolution conversion ratio of the character is provided, and the output of the first and second resolution conversion means is switched and selected according to the display data configuration of the program used. Even for CRT display data that has a correlation between character data and graphic data, the resolution is reduced by matching one of the resolutions, and a flat panel display is created without causing a shift between the character data and the graphic data It is possible to provide a display control device that can be displayed on the device.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a block diagram showing a detailed circuit configuration, and FIG. 2 is a block diagram showing a system configuration. DESCRIPTION OF SYMBOLS 1 ... Host computer, 2 ... 1st display terminal, 3 ... 2nd display terminal, 11 ... Display control part, 12 ... Code data refresh memory, 13 ... Character generator, 14 ... OR circuit , 15... Graphic data refresh memory, 16... First resolution converter, 17... Second resolution converter, 18... Multiplexer, 19.

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) G09G 5/36 520 G09G 5/26 G09G 5/40 G06F 15/66 355 G06F 15/62

Claims (1)

(57) [Claims] 1. A display control device for displaying on a second display device having a different resolution from a first display device, comprising: a code memory for storing character display code data; and a resolution for the first display device. A graphic memory for storing graphic display image data, and a display resolution of the code data for the first display device and a display resolution of the code data for the second display device. First resolution conversion means for converting the resolution according to the ratio of the image data stored in the graphic memory to the resolution of the first display device in the X or Y direction and the X resolution of the second display device. Second resolution conversion means for converting the resolution according to the ratio with respect to the resolution in the direction or the Y direction; Stage and one is selected, the display control apparatus characterized by comprising an output means for outputting the converted image data to the second resolution conversion means.