JPH02170222A - Picture information display device - Google Patents

Abstract

PURPOSE:To perform the smooth display of the picture information for each dot by preparing and displaying the display data equivalent to a single scan line onto a line memory. CONSTITUTION:When a signal is outputted from a synchronizing signal output circuit 10, the reading jobs are started to line memories 7 and 8. The first byte of the picture data on the memory 7 is loaded to a shift register 11, and the display valid bits are loaded to a counter 12 from the memory 8. The display bit address is inputted as the selection value of a data selector 13. A clock is supplied to the counter 12 and the picture data is outputted via a serial OUT terminal of the shift register which is selected by the display bit address by an amount equal to the display valid bits synchronously with the clock. Then the following data are read out of both memories 7 and 8 when the counter 12 shows zero. Then the picture data is outputted. In such a way, the picture information are displayed on a window for each dot.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a raster-type image display device that displays multi-windows, and particularly to a raster-type image display device that displays multiple windows at arbitrary bit positions on a display screen. This invention relates to a multi-window display device.

<Prior Art> Multi-window has been attracting attention as one of the man-machine interfaces in recent personal computers and workstations.

When displaying a plurality of windows on a raster scanning type CRT device, the following two methods are mainly considered.

fl An image booter for each window is stored in the memory, and a separate memory area for one-to-one display with the CRT screen, that is, a refresh memory, is provided, and the image data of each window is stored in the refresh memory according to display priority. How to write to and display the image data of each window.

(2) Refresh memory like fl above is installed,
While detecting the position of each window on the display screen in synchronization with the rask scan of the CRT, the image data of each window stored in separate areas on the memory is read out.
How to achieve multi-window display.

<Problems to be Solved by the Invention> However, the conventional fl+ method has the problem that it takes a long time to write to the refresh memory, and that smooth screen display cannot be performed due to the relationship with the screen display time. Furthermore, in the method (2), due to the balance between screen display time and memory read time, reading dots one by one from the memory will not be enough for display, and the dots must be handled in units of several dots at a time. In this case, there is a problem that it becomes difficult to realize window display in units of one dot.

The present invention was invented to solve the above-mentioned problems, and its entire purpose is to provide an image information display device capable of smoothly displaying dot by dot.

Means for Solving the Problems> In order to achieve the above object, the present invention provides a Rusk-type image information display device that sequentially reads out image information stored in a memory and displays it in a multi-window on a display unit. storage means for storing pixel data of each window displayed on the display section, synchronization signal generation means for generating a synchronization call for display, temporary storage means for storing all the position information of the plurality of windows displayed on the display section; Line information storage means for storing information for each line of display from the output of the synchronization signal generation means, the output of the storage means, and the output of the temporary storage means, and the output of the row information storage means to the display section. The object of the present invention is to provide an image information display device equipped with a generating means for generating data, thereby achieving the above object.

<Operation> By the image information display device configured as described above, the display data for the -scanning line is prepared in advance in the line memory and displayed.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment according to the present invention,
The processor 1 writes the image data of each window into the memory 6, sets the window information register 2, and so on. The window information register 2 is for storing display information such as the display position of each window, storage address on memory, and window display priority, and its output is connected to a display window information output circuit.

The memory access arbitration circuit 3 is located between the processor 1, the image data output circuit 4, and the memory 6 to avoid simultaneous access to the memory 6.

The display window information output circuit 5 is connected to the synchronization signal output circuit 1.
0, outputs the display memory address according to the settings in the window space register 2 to the image data output circuit 4, and also outputs the display bit address as bit boundary information and the display effective Villatra line memory 8. It is outputting.

When the image data output circuit 4 receives the display memory address, it takes out 8-bit image data from the memory 6 through the memory access arbitration circuit 3 and outputs it to the line memory 7.

The line memory 7.8 is an 8-pit FIFO that stores image data for display.Line memory 8 in particular stores bit boundary information of the image data, that is, the display bit address indicating from which bit of the data is valid. 4 bits are allocated to display valid bits.

The bit shaping circuit 9 includes a shift register for parallel-to-serial conversion of the parallel 8-bit image data outputted from the line memory 7, and a 4-bit counter for counting valid bits outputted from the wine memory 8. and 8×1 to select the output end of the shift register
The output is sent as display image data to a display section (not shown).

A synchronizing signal output circuit 10 generates horizontal and vertical synchronizing signals for driving a raster scanning type CRT device and a signal indicating a display period.

The image information display device of the present invention is constructed as described above, and FIG. 2 shows the screens displayed on the six display sections, the operation of which will be explained below.

In this case, the display priority of the windows is window 2,
1. This priority order, the storage address in the memory 6 of windows 0.1.2, and the position of each window on the display screen are stored in the window information register 2 in the order of O. When the synchronization signal output circuit 10 outputs a signal for displaying the shiraster scanning line As a result, display bit address 0 and display valid bit 8 are all output, and line memory 8 is output.
Set to . When the image data output circuit 4 receives this byte address wadd O, it reads the image data (dots 0 to 7 on the Lanuta scanning line X on the display screen) from the memory via the memory access arbitration circuit 3, and outputs the line. Set in memory 7. Similarly, image data obtained from byte address waddo+1 of window O (dot 8
15), display bit address 0, and display valid bit 8 are set in line memories 7 and 8.

Next, when approaching the boundary between window 0 and window 1, the byte address of window O wadd O
2 bits of image data to be displayed (dots 16 to 17) obtained from +2, 6 bits of image data hidden under window 1, display bit address O, and display valid bit 2
Data for l raster scanning lines is set in the line memories 7 and 8.

The situation at this time is shown in FIGS. 3 and 4.

Further, the internal configuration of the bit shaping circuit 9 receiving the outputs of the line memories 7 and 8 is shown in FIG.

When the synchronization signal output circuit 10 outputs a signal indicating the display period, reading from the line memories 7 and 8 begins.

First, the first byte of the image data in the line memory 7 is loaded into the shift register 11, the display valid bit from the line memory 8 is loaded into the counter 12, and the display bit address is input as the selection value of the data selector 13.

A clock (not shown) is supplied to the counter 12, and in synchronization with this clock, image data corresponding to valid display bits is output from the serial out terminal of the shift register selected by the display bit address, and when the counter indicates 0, The next data is read from the line memories 7 and 8 and image data is output.

By repeating the above sequence, display image data for one raster scanning line is displayed, and window display in units of one dot becomes possible.

<Effects of the Invention> Since the present invention is configured as described above, it is possible to realize a multi-window display device capable of displaying images in a dot-by-dot manner.

Fig. 2 is an explanatory diagram showing an example of the display screen, Fig. 3 is an explanatory diagram showing an example of the contents of the line memory, Fig. 4 is an explanatory diagram showing an example of dot positions on the screen, and Fig. 5 is an explanatory diagram showing an example of the dot position on the screen. FIG.

1: Processor, 2: Window information register,
3: Memory access arbitration circuit, 4: Image data output circuit, 5: Display window information output circuit, 6: Memory, 7: Line memory (image data), 8-line memory (bit boundary information), 9: Bit shaping circuit , 10: Synchronous signal output circuit, 11: Shift register.

12: Counter, 13: Data selector.

20: Window 0. 21: Window 1゜22: Window 2゜Representative Patent Attorney Takeshi Sugiyama (and 1 other person)! Figure, 46 yo: /I ト”i／ト Busy V い み = No.

Claims (1)

[Scope of Claims] 1. In a raster-type image information display device that sequentially reads out image information stored in a memory and displays the image information in multiple windows on a display unit, there is provided a memory for storing pixel data of each window to be displayed on the display unit. means, synchronization signal generation means for generating a synchronization signal for display; temporary storage means storing position information of a plurality of windows to be displayed on the display unit; output of the synchronization signal generation means; output of the storage means; and line information storage means for storing display line-by-line information from the output of the temporary storage means, and generation means for generating data for the display section from the output of the line information storage means. image information display device.