JPH03235993A - Multiwindow display system - Google Patents

Abstract

PURPOSE:To prevent a window display from becoming abnormal and to speed up switching by storing data to be displayed corresponding to windows in frame memories and reading out the data by position size registers at the scanning times of the respective windows. CONSTITUTION:The frame memories 3a - 3c have capacity equal to the number of picture elements of the display screen of a monitor 10 respectively and are stored with data to be displayed in the respective windows A - C, and those stored data are read out by the position size registers 4a - 4c in the synchronism with the scanning signal of the display screen and applied to a switch 7. Number data indicating the priority among the respective windows A - C is stored in a window memory 6 having capacity equal to the number of picture elements of the display screen and a switch 7 selects and supplies high-priority data to the monitor 10 according to numbers indicating the priority. Consequently, the window display is prevented from becoming abnormal owing to the alteration of a color map and the switching pertaining to a priority change is speeded up.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention sets a plurality of windows, including partially overlapping windows, on one display screen, and displays user information in each window. This invention relates to a multi-window display method for displaying data according to a program.

(Prior Art) FIG. 2 is a block diagram of this type of display system that employs a conventional multi-window display method.

In the figure, user programs la and lb.

When the display data is input according to the IC,
The window system 2 writes these data into the frame memory 3, and the contents of this frame memory 3 are used as they are in the window A of the monitor 10.

Displayed on B and C.

Here, assuming that the monitor 10 is a color display CRT, the frame memory 3 has a capacity equal to the number of display pixels on the display screen of the monitor 10, and the window system 2 stores luminance data and R, G, B for each display pixel. Primary color data (
or color difference data) is written into the frame memory 3.

(Problem to be Solved by the Invention) In the conventional multi-window display method described above, assuming that window A and window B partially overlap, changing the color map of one window causes the color map of the other window to change. There were times when the display became abnormal.

Furthermore, when windows overlap, it is necessary to check whether data in each window can be displayed, which increases the load on the software of the window system 2.

Furthermore, if the window priority is changed during display, the display screen will gradually change as the frame memory 3 is rewritten, so it may take several to 10 seconds for everything to change, which satisfies the requirement for instantaneous switching. I couldn't.

This invention was made to solve the above-mentioned problems, and it prevents abnormalities in window display caused by changing the color map, and also simplifies the configuration of the window system and changes the priority when windows overlap. The purpose of this invention is to obtain a multi-window display method that can realize high-speed switching.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a display device in which a plurality of windows, some of which partially overlap, are set on a single display screen, and each window displays data according to a user's program. , a first memory provided corresponding to the number of windows, each having a capacity equal to the number of pixels of the display screen, and storing data to be displayed in each window, and a first memory corresponding to the scanning time of the window; a position register for reading data from the frame memory;
a second memory for storing the display priority of the window, and selects the data of the first memory read by the position register according to the display priority of the second memory and displays the data on the display screen. I am trying to display it.

(Function) In this invention, the data to be displayed corresponding to the window is stored in the first memory, and this data is read out by the position register at the scanning time of each window, so that the color map can be changed. It is possible to prevent window display abnormalities associated with this.

Furthermore, since the first memory for storing display data is provided in correspondence with the user's program, there is no need to check for overlap with other windows, thereby simplifying the window system.

Furthermore, since it is equipped with a second memory that stores the display priority of the window, it is only necessary to change the contents of this second memory when the priority is changed or the position is moved, and the display screen High-speed switching and batch switching are possible.

(Embodiment) FIG. 1 shows an example of the configuration of an apparatus for carrying out the present invention. In the figure, the same elements as those in FIG. 2 are given the same reference numerals and their explanations will be omitted.

Here, frame memories 38 to 3C corresponding to programs 18 to IC are provided. Each of these frame memories 3a to 3C has a capacity equal to the number of pixels on the display screen of the monitor 10, and stores data to be displayed in each window two-dimensionally with respect to the origin position. The data stored in these frame memories 3a-3c are read out by position size registers 4a-4c, respectively, in synchronization with the scanning signal of the display screen. In this case, the position size registers 4a to 4c contain the position (x, y) of each window.
and its size (XL, YL) are set, and by operating this,
Data shifted in the direction and the X direction is output. Further, color data (n gradation R, G, B data) corresponding to the read data of the position size registers 4a to 4c are stored in the color map memories 5a to 5C as look-up triples. Therefore, each window A, B.

At the time corresponding to C, the signals SA, SB, containing the display data of this window and the color data for this data are
Sc is output and applied to the switch 7.

On the other hand, number data indicating the priority of each window A, B, and C is stored in a window memory 6 having a capacity equal to the number of pixels of the display screen.
The number "1" indicating the priority at the scanning time of window B
The number "2" indicating the priority at the scanning time of window C
The number "3" indicating the priority is read out at each scanning time and added to the switch 7. Switch 7
signals SA, S8 according to the numbers indicating these priorities.
゜Select one of Sc with higher priority and monitor 1
It is configured to give 0.

Next, the operation of the window system 2 will be explained.

When a user's program 1a to IC is input, the window system 2 allocates and stores display data in the frame memories 3a to 3c, and also stores the display data in the position size register 4.
The position (x, y) and size (XL, YL) of each window are set in 8 to 4C, and the number indicating the priority is set in the window memory 6.

Here, if the positions and sizes of windows A, B, and C are changed, the contents of position and size registers 4a to 4c and window memory 6 are updated.

Further, if there is a change in priority, the number in the window memory 6 is updated.

By the above setting operations in window system 2,
Data corresponding to windows A, B, and C are applied directly to the monitor 10.

Thus, according to this embodiment, the data to be displayed corresponding to the window is stored in the frame memories 38 to 3C, this data is read out by the position size registers 4a to 4C at the scanning time of each window, and The color data for the data is stored in the color map memory 5a~
Since the information is stored in the 5C, it is possible to prevent abnormalities in window display due to changes in the color map.

Also, frame memories 38 to 3C that store display data
Since the window is provided in correspondence with the user's program, there is no need to check for overlap with other windows, thereby simplifying the configuration of the window system 2.

Furthermore, since it is equipped with a window memory 6 that stores the display priority of the window, it is only necessary to change the contents of this window memory 6 when the priority is changed or the position is moved. Switching and batch switching are possible.

In the above embodiment, color display is targeted; however, a frame memory for storing data to be displayed is provided corresponding to each window, and display priority is stored in the window memory as a number, and the display priority is stored in accordance with this number. It is clear that the point of switching the display data and outputting it to the monitor can be applied to a monochrome display device.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to prevent abnormalities in window display due to changes in color maps, and also to simplify the configuration of the window system and prevent switching due to changes in priority when windows overlap. Speed-up is achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a display system embodying the present invention, and FIG. 2 is a block diagram of a display system employing a conventional multi-window display method. 1a-IC...Program, 2...Window system, 3a-3C...Frame memory, 4a-4C.
...Position size register, 5a to 5C...Color map memory, 6...Window memory, 7...Switcher, 10...Monitor.

Claims (1)

[Claims] In a display device in which a plurality of windows including partially overlapping windows are set on one display screen and data according to a user's program is displayed on each of the windows, provided in correspondence with the number of the windows, a first memory each having a capacity equal to the number of pixels of the display screen and storing data to be displayed in each window; and a position register for reading data from the frame memory in accordance with a scanning time of the window; a second memory for storing the display priority of the window, and selects the data of the first memory read by the position register according to the display priority of the second memory and displays the data on the display screen. A multi-window display method characterized by displaying.