JPS62217378A - Multi-window display control system - Google Patents

Abstract

PURPOSE:To execute at high speed a display onto a screen and the access of refresh by providing an address designating circuit for designating the display position of a multi-window, and a display sequence deciding circuit for designating the overlap sequence of the screen, on a display memory. CONSTITUTION:An address designating circuit 3 designates a screen address being the display position of a multi-window display, and a display sequence deciding circuit 4 decides the priority of an overlap when a data is overlapped and displayed. An address data inputted from the circuit 3 is also synthesized by the circuit 4, and an initial data is written to a display memory 2 for writing a data which is displayed on the display screen of a display device 1. Also, the access of a data used for write for the subsequent refresh is executed. In this way, the access of a display memory and a source memory can be executed easily at the high speed, and also, the quality of a screen can be improved without obstructing the refresh in the multi-window display.

Description

[Detailed Description of the Invention] [Summary] This is a control method for multi-window display, in which the display positions of multiple sides are stored in a register, the screens are combined in the memory in the order in which they are stacked, and the display on the display screen is refreshed. A control method that enables faster access is disclosed.

[Industrial application field]

The present invention relates to a display memory control method for multi-window display using a character or graphic display device.More specifically, the present invention relates to a display memory control method for multi-window display using a character or graphic display device.More specifically, the display memory generally uses volatile memory and requires refreshing. In the previous case, correspondence was made for each screen, but this method is an improvement on this method to make correspondence with data synthesized in memory to speed up access.

Multi-window, also called multi-screen, is a method of simultaneously displaying multiple screens on a single display screen, and has the same effect as using multiple terminals.

For example, you can display a list of data in one window, its graph in another window, and the previous page in another window, making it extremely useful as you work at your desk in an interactive manner with the terminal. It has become an indispensable method in fields where computers are used, including office automation.

However, in a single multi-win display, the amount of data that specifies the display screen address inevitably increases, so
Display memory or video RAM (random access)
There is a need for a system that speeds up the initial writing of a volatile memory (called a memory) and the refresh access that is required at regular intervals.

[Conventional technology]

In conventional multi-window display, when writing the display position of data to be displayed on the display screen, that is, the screen address, into the display memory, a method is used in which each screen address is written according to the number of sheets of display data.

Therefore, when displaying pages overlappingly in a multi-window display, overlapping data is written to the display memory, and the data in the overlapping area is erased, resulting in unnecessary data writing. This will occur.

[Problem that the invention seeks to solve]

In this conventional method, when refreshing the display memory at fixed time intervals, the screen address of each piece of data that requires multi-window display must be accessed from the source memory, which makes it difficult to display multi-window display. The disadvantage is that as the amount of data increases, the number of accesses and time increase in proportion to the amount of data.

Therefore, depending on the amount of data, a volatile display memory may be required or the refresh time may be exceeded, and the brightness of the display screen of the display device may change, causing flicker on both sides.

The present invention has been improved in view of these problems, and an object of the present invention is to provide a display memory control method that allows memory writing for the purpose of refreshing before the volatile display memory disappears. .

[Means for solving problems]

FIG. 1 shows a block diagram of the principle of the multi-window display control method of the present invention.

In FIG. 1, 1 is a display device for characters or graphics, and 2 is a display memory into which data to be displayed on the display screen of the display device 1 is written.

Reference numeral 3 designates an address designation circuit for designating the address on the screen of data to be displayed on the display screen 2.

Reference numeral 4 denotes a display order determining circuit that determines the order in which data is stacked when a portion of the data to be displayed in a multi-window is displayed in an overlapping manner based on input from an operator.

With such a circuit configuration, the present invention combines all the address data input from the address designating circuit 3 in the display order determining circuit 4, writes the initial data in the display memory 2-2, and writes the post-reflection data in the display memory 2-2. It is intended to simplify the access of the data used for writing.

(Function) The address designating circuit 3 is a circuit for designating a screen address which is a display position in multi-window display, and the display order determining circuit 4 determines the priority order of overlapping when data is displayed in an overlapping manner.

As shown in the multi-window display format diagram in FIG. 2, the display formats of the multi-window display include an independent multi-display 21 and an overlapping multi-display 22 in which data is overlapped and some of the data is Two types of display methods in which only the image is observed are typical display examples.

In the case of the independent multi-display 21, the display allocation position of each monitor is determined, and in the case of the overlap-type multi-display 22, the priority of data stacking, that is, the data that is located at the forefront and all data is displayed. , enter the order of the data to be stacked after that.

The display order determining circuit 4 is a memory that combines and stores the screen addresses of each data inputted to the address designating circuit 3.

〔Example〕

FIG. 3 is a block diagram of a peripheral circuit of a display device illustrating an embodiment of the present invention.

In FIG. 3, 1 is a display device that displays data in a multi-window format, and 2 is a display memory that stores data to be displayed on the display device 1. Guinamisoku RA, M are used.

Reference numeral 3 denotes an address designation circuit, which is composed of registers that store screen address data for displaying the data input from the address input section 31. It is set up.

Reference numeral 4 denotes a display order determining circuit which reads and synthesizes the data from the address designating circuit 3, and performs initial writing of the synthesized data into the display memory 2 and update writing at regular intervals for subsequent refreshing.

5 is a clock generator, which causes the synchronization signal generating circuit 6 to operate at all times.This becomes the internal address, and when the screen address is written to the display memory,
The addresses of the ROM are constantly scanned sequentially from address O to the final address.

7 is a signal converter, and is a shift I register that converts the signal sent from the display memory so that it can be displayed on the display device 1, and performs parallel-to-serial conversion.

8 is a character generator, which is a ROM (read only memory) necessary for operating as a character display device.

Character generators usually store characters, symbols, and for special purposes patterns and symbol marks, and in the case of graphic displays, data broken down into dots is directly stored in the display memory. This makes it unnecessary.

In this device, the display memory requires a large amount of memory, so generally a RAM with different pixels and densities is used, which requires refreshing within a certain period of time and updating of writing is required. It will be done. In this case, the source data of the target address can be processed only by the display judgment circuit 4, thereby speeding up the access.

Note that the double-sided addresses are input to the address designation circuit 3 from the keyboard in order of priority of the display screen. For the screen address, as shown in the address input explanatory diagram in FIG. 4, the X start coordinate, Send to.

A static RAM is used in the display order determining circuit 4, and the data synthesized here allows access to the display memory for initial or subsequent writing to be completed in one go, thereby speeding up the processing.

〔Effect of the invention〕

As described above, according to the present invention, access between the display memory and the source memory becomes faster, and the quality of the display screen can be improved without interfering with refresh in multi-window display. Extremely useful.

[Brief explanation of drawings]

Fig. 1 is a principle block diagram of the multi-window display control method of the present invention, Fig. 2 is a multi-window display format diagram, Fig. 3 is an explanatory diagram of an embodiment of the present invention, Fig. 4 is a screen address input FIG. In Fig. 1, 1 is a display device, 2 is a display memory, 3 is an addressing circuit, and 4 is the source of the display order judgment circuit, the internal flow.
77th Figure 1? , l/ten, small color diagram of the window Fig. 2 The mystery of the present invention Part 3 Explanation of screen address input

Claims (1)

[Claims] Character or graphic display device (1
), the display device (1) includes an addressing circuit (3) for specifying display positions of multiple screens to be displayed in a multi-window display in the display memory (2), and an addressing circuit (3) for specifying display positions of multiple screens to be displayed in a multi-window display; A multi-window display control system comprising: a display order determining circuit (4) for specifying a stacking order, and performing multi-window display on the display device (1).