JPH0442197A - Graphic display device - Google Patents

Abstract

PURPOSE:To increase the efficiency of the operation of a graphic writing device which is connected and to enable the faster writing and display of graphic information by providing plural image memories in the display device. CONSTITUTION:A switch 1-g for graphic display is connected to an image memory A1-c, so the graphic information in the image memory A1-c is displayed; and a switch 1-b for graphic writing is connected to the side of an image memory B1-d, where erasure and writing by a graphic writing device 1-a are performed simultaneously. Therefore, writing and displaying are both switched in the order of the image memory A, the image memory B, and an image memory C to plot and display a moving image fast.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a graphic display device having a plurality of sets of image memories.

[Summary of the Invention] A graphic display device for writing and displaying graphic information,
By preparing a plurality of sets of image memories in the device, the efficiency of the graphic writing device that writes graphic information to the graphic display device can be increased. It is possible to write and display graphical information.

[Prior Art] Hereinafter, the conventional technology will be explained with reference to the drawings.As shown in FIG. In the example in Figure 2, one image memory A2-c is used for display, and one image memory B2-d is used for writing. Based on FIG. 3, the switching timing of the double buffer used will be explained. First, since the second drawing image memory B2-d is selected for writing, the image memory B2-d is erased. Then, the graphic writing device 2-a in FIG. 2 writes the graphic into the image memory B2-d. When the writing is completed, in order to display the figure in the image memory B2-d, the second figure display switch 2-f is switched to the image memory B2-d.
-d side, the second figure figure writing switch 2-f is switched to the image memory A2-C side in order to write into the image memory A2-c.

Here, especially when switching the display switch 2-f, as shown in Figure 3, start the frame display (start the graphic display,
It is necessary to switch this display switch in accordance with the vertical synchronization signal to the CRT. Therefore, in a graphic display device for displaying on a normal 60 Hz non-inklace CRT, the time from the start of display of a frame to the start of display of the next frame is 1/60 seconds = L6.6 ms, so the above display switch is The average switching time is approximately 1
6.6/2m5=8.3ms, you will always have to wait. In the example of FIG. 3, since erasing and writing are completed just during the switching of the display changeover switch 2-f, the graphic writing device 2-f in FIG.
Although the graphic display bag M2-a and the graphic display bag M2-e are operating, in reality, as shown in FIG. is in a state where nothing is being done (IdJ2e state)
, which has become a problem in drawing figures at high speed.

Now, based on FIG. 4, figure writing device 2-a in FIG.
The Idj2e state that occurs will be explained. First, the third
Similarly to the figure, since the display switch 2-f is on the image memory A side, graphic information written in one image memory A is displayed. Information is written, the display start point of the next frame is set so that the graphic information in image memory B is displayed without image disturbance, and nothing is done to the graphic writing device (IdI2e status 9). will occur.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an I d of a graphic writing device by switching a display switch.
In order to eliminate the j2e state, a new set or
It has a multi-buffer configuration with multiple sets of image memory added.

[Function] The present invention uses a multi-buffer system having image memories for several sets of Pi to operate the figure writing device more efficiently than before, so this figure display bag! , it is now possible to draw figures faster.

[Example] Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.
In this embodiment, a triple buffer system is used, which is composed of three sets of image memories, which is an addition of one set of image memories to the conventional double buffer system. FIG. 5 shows the timing of this embodiment, and the operating status of each image memory will be explained based on this fifth section. first,
Since the display switch l-g in FIG. 1 is connected to the image memory AI-c, the zero figure writing switch 1-b on which the figure information of the image memory AI-c is displayed is
In the image memory Bl-d connected to the image memory Bl-d side, erasing and writing by the graphic writing device 1-a are simultaneously performed.

Similarly, switches 1-b and 1-d are controlled by an external processor (not shown). Alternatively, the graphic writing device may control the switch 1-b, and the graphic display device may control the switch 1-g.

In the conventional double buffer method, one image memory Bl
- When writing to d is completed, in order to switch the display, until the display start point of the next frame arrives,
The graphic writing device enters the Idile state. However, in this embodiment, the figure writing switch lb is switched to the image memory C that is not being displayed, erased or written at that time, so the Idβe state does not occur, and one image memory C1-e When the writing to the image memory A I-c is completed, similarly to the above, writing to the image memory A I -c which is not currently being displayed, erased or written to is started. In this way, by switching between writing and displaying image memory A, - image memory B, - image memory C in order, it is possible to draw and display dynamic images at high speed. Become. Furthermore, in this embodiment, three sets of image memories are prepared, but by further increasing the number of sets, the figure writing device 1-
It becomes possible to operate a.

[Effect of the Invention 1] As described above, according to the present invention, it is possible to operate the graphic writing device more efficiently than with the conventional double buffer method, and write graphic information at higher speed. This has the effect that it can be displayed.

FIG. 3 is a diagram showing the timing of the triple buffer method according to the present embodiment.

Applicant: Seiko Electronics Industries Co., Ltd. Agent: Patent Attorney: Keinosuke Hayashi

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a graphic display device according to the present invention;
FIG. 2 is a block diagram of a graphic display device with a tuple buffer system, FIG. 3.4 is a diagram showing the timing of the double buffer system, and FIG. 5 is a diagram showing the timing of the double buffer system. ] 1) Alba Sofa 'Fimin 7 Figure 5 x 3

Claims (1)

[Claims] In a graphic display device that writes and displays graphic information,
By preparing multiple sets of image memories in the display device, the operating efficiency of the connected graphic writing device is increased, making it possible to write and display graphic information at higher speed. A graphical display device.