JPS62282376A - Color display control system - Google Patents

Abstract

PURPOSE:To reduce a transfer time and to shorten a time to a display by reducing the quantity of the transfer from a window memory to a video memory according to a color to be used when the color to be used is little. CONSTITUTION:The window memories 1, 2 are respectively constituted of the three surfaces of R surfaces 11, 21, G surfaces 12, 22 and B surfaces 13, 23 corresponding to the three primary colors of light. In writing signal lines 14-16, 24-26 connecting a writing circuit 3 and the respective surfaces of the window memories 1, 2, written display flip-flops (FF) 17-19, 27-29 are respectively provided. A writing signal is transmitted to the respective surfaces of the window memories 1, 2, the corresponding written display FF is set, and the series of a writing operation is completed, and then, a transfer circuit 6 refers to the contents of the respective written display FFs and transfers the contents stored in the surface of the window memory corresponding to the set and written display FF to the video memory 5.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a color display device used as a data output device of a news processing system. The present invention relates to a color display control method in which the multi-window function is fully realized by selectively transferring the contents of a window memory to a video memory.

(Prior art) Figure 2 shows an overview of this type of color display f4. show. The color display is comprised of a video memory 5 which stores all the content actually displayed on the display 7, and a window memory 1, 2 corresponding to each logical window.

Each window memory is composed of multiple planes to represent each color. For example, in the case of a typical 8-color display, red (bug), green (()reen)
) and blue.

(Problem to be Solved by the Invention) By the way, in a conventional multi-window display, the contents of the window memory are updated by writing graphs and characters, and the contents of all sides belonging to that window are transferred to the video memory. Please note that this enables multi-window functionality.

However, even if only one side of the window memory is updated, the contents of all sides will be transferred, resulting in unnecessary transfer time and the disadvantage that it will take a long time to be displayed. I feel sorry for you.

An object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a color display control method that shortens the time required to transfer text to the video memory when updating text due to limited window memory, and shortens the time until display. It is about providing.

(Means for Solving the Problems) In order to achieve all of the above objects, the color display control method according to the present invention is a color display control method that realizes a multi-window function by transferring the contents of a plurality of window memories to a video memory. , a plurality of window memories each having a plurality of surfaces representing each color, a written display flip-flop provided corresponding to each surface of the plurality of window memories, and a plurality of window memories selected by a window selection signal. A write circuit that stores write information on the window memory surface and sets all 7 flip-flops for indicating written information corresponding to the T side, a video memory, and a corresponding 70-piece write-in display flip-flop. and a phase shift circuit that transfers the contents of the area of the window memory where is set to the video memory.

(Example) The following describes the present invention with reference to drawings, etc. More detailed explanation: FIG. 1 is a block diagram showing an embodiment of a color display control system according to the present invention.

This embodiment is an example in which there are two window memories, and window memories 1 and 2 have eight sides 11 and 21 corresponding to the three primary colors of the party, red (R), green (G), and blue (B), respectively.
．． It is composed of three surfaces: 0 surface 12, 22.8 surface 13.23.

The write circuit 3 is connected to each side of the window memory 1.2 by write signal lines 14, 15, 16, 24, 25 and 26. These write signal lines are connected to a written display flip-flop 17.1 that sets an update flag for each side.
8, 19°, 27, 28 and 29, respectively.

After the transfer from each side of the window memory 1.2 to the video memory is completed, these written display flip-flops are reset, but when a write signal is sent to the valley side, the corresponding write A completed display flip-flop is set.

Which window memory is included in the window:
The i4 option is selected by No. 4.

Once the series of write operations to window memory is finished,
The contents of the window memory are transferred to the video memory 5 by the transfer circuit 6.

At this time, the transfer circuit 6 refers to the contents of each written display flip-flop, and the contents stored in the surface of the window memory corresponding to the written display flip-flop for which the flag is set, that is, the flag is set. Total video memory 5
Transfer to.

Therefore, the contents of areas of window memory that are not flagged, ie, have not been updated, are not migrated. The loaded display flip-flop corresponding to the side of the window memory that has been transferred is reset.

As a result of the above, the S# content is efficiently transferred to the video memory, reducing the transfer time. It can be caused.

(Effects of the Invention) As described above in detail, the present invention provides a write-indicating flip-flop for each side of the window memory, and when a write signal is stored in that side, the corresponding written-in state is displayed. The configuration is such that only the sides of the written display flip-flops with the A flag set are selected for transfer to the video memory by setting the flag '7t on the flip-flops, so if there are few colors used, Since the amount of data to be transferred from the window memory to the video memory can be reduced accordingly, the transfer time can be reduced, and the time until the image is broken can be shortened.

[Brief explanation of drawings]

The first factor is a circuit block diagram showing an embodiment of the color display control method according to the present invention, and FIG. 2 is a schematic diagram of the configuration of a multi-window type color display device. 1.2...Window selection signal 3...Write circuit 4...Window selection signal 5.
...Video memory 6...Transfer circuit 7...Display 11.21...R surface 12.22...G
Surface 13.23...8 surface 17.18.19,27,
28.29...Written display flip-flop 14.15, 16, 24, 25.26...Written signal output 1 Figure

Claims (1)

[Claims] In a color display control method that realizes a multi-window function by transferring the contents of a plurality of window memories to a video memory, a plurality of window memories each consisting of a plurality of surfaces expressing each color, and each surface of the plurality of window memories are provided. a written display flip-flop provided corresponding to the window memory, and a written display flip-flop that stores the written information in the side of the window memory selected by the window selection signal and corresponds to the side where the written information is stored. , a video memory, and a phase shift circuit that transfers the contents of the surface of the window memory in which the corresponding written display flip-flop is set to the video memory. Color display control method.