JPH03260698A - Display device - Google Patents

Abstract

PURPOSE:To obtain the display device which can execute a dynamic screen layout at a high speed and at a low cost by providing a raster scan display control part and a refresh memory, and a relative access memory between both of them. CONSTITUTION:Between a raster scan display control part 7 and a refresh memory 10, one stage of relative access memory 9 is provided, and a relative address of the refresh memory 10 whose real display is desired is written therein. In such a way, the contents of the refresh memory 10 designated by the relative address are read out onto a refresh memory read-out data bus 11 and displayed on a display layout 12 through a raster scan display control part 7, therefore, the display layout 12 can be realized at a high speed without executing a reconstitution of the refresh memory by a data transfer like a software or a hardware.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a display device, and particularly to a display device for dynamically developing a layout on a screen in a system having a refresh memory space much larger than the actual screen display capacity. relates to a relative access display device.

[Conventional technology]

In order to realize a dynamic layout, conventional display devices cut out and transfer the display-requested portions of multiple screen refresh memories that are logically expanded to other areas from the actual display refresh memory area, and perform refresh operations. This was achieved by reconfiguring it in memory.

FIG. 2 is a block diagram showing the configuration of an example of such a conventional display device. In FIG. 2, the actual display refresh memory 4 is directly accessed by a linear refresh memory address bus 2 in one-to-one correspondence with the display position output from the last scan display control section 1, and a display layout 6 is obtained as it is. Therefore, for dynamic screen reconfiguration, the portion that is not to be laid out must be extracted from the logically developed refresh (logically developed refresh memory) 5 and transferred onto the actual display refresh memory 4 by software or hardware.

[Problem to be solved by the invention]

Conventional display devices, such as those described above, perform reconfiguration by transferring memory data either by software or by using specialized transfer hardware, from the time of request until completion of the desired display. The drawback is that it requires additional processing time and requires the creation of complex software or hardware, making it expensive.

[Means to solve the problem]

The display device of the present invention has a configuration in which a one-stage relative access memory is provided between the raster scan display control section and the refresh memory, and the actual display refresh memory can be written to and displayed. , the screen layout can be dynamically reconfigured without data transfer using software or hardware.

That is, the display device of the present invention includes a raster scan display control section, a refresh memory, and a relative access memory provided between the raster scan control section and the refresh memory.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

The difference between this embodiment and the conventional display device shown in FIG. Reads the contents of the specified refresh memory 10,
Since the display is performed via the raster scan display control unit 7, the display layout 12 can be realized at high speed without reconfiguring the refresh memory by software or hardware data transfer.

〔Effect of the invention〕

As described above, the display device of the present invention has the effect that by providing a relative access memory, a display device that can perform a dynamic screen layout at high speed and at low cost can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a conventional display device. 1.7... Raster scan display control section, 2.
8...Refresh memory address bus, 3.12.
. . . Refresh memory read data bus, 4. Actual display refresh memory, 5. Logical expansion refresh memory, 6.12. Display layout, 9. Relative access memory, 10. Refresh memory. No. / Seki

Claims (1)

[Claims] A display device comprising: a raster scan display control section; a refresh memory; and a relative access memory provided between the raster scan control section and the refresh memory.