JPH0419694A - Display control method - Google Patents

Abstract

PURPOSE:To easily execute display control for obtaining required color image data by periodically masking image data at the time of reading out the image data from the 1st storage device and transferring them. CONSTITUTION:At the time of reading out image data from the 1st storage device 33 and transferring them to a bit map display 37, the 2nd storage device 34 is referred, and when the contents of the device 34 indicate blink display, the image data to be transferred are periodically masked to abort their transfer to the bit map display 38. Since only the specific image to be blinkingly displayed is periodically masked and the image data are changed, it is unnecessary for a processor 31 to execute complex processing relating to all images. In the case of color display, the contents of a color image data output means can be changed without changing the contents of the image data. Consequently, color change at the time of blink display can easily be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a display control method for controlling the display of a specific image displayed on a bitmap display.

(Prior Art) Bitmap displays, which can control the display of each bit on a display screen, are widely used as displays for computer systems and the like.

In this bitmap display, image data is prepared for each bit on the display screen, and this image data is transferred to the bitmap display for display.

Display control of the bitmap display is performed by a display control device. There are two main types of display control methods using this display control device: one for binary display and one for color display.

FIG. 2 shows a block diagram of a conventional binary display control device.

In the figure, a processor 2 that controls a display control device 1 is connected to a video RAM 3 that stores image data. A bitmap display (CRT) 5 is connected to the video RAM 3 via a display control section 4.

The processor 2 controls the rewriting of image data in the video RAMB. Video RAM3 is CR
It consists of a RAM etc. that stores image data 7 corresponding to each bit (dot) on the display screen 6 of the T5. The display control section 4 controls the display of the CRT 5 based on the image data stored in the video RAM 3, that is, transfers the image data. The CRT 5 is a display device that displays a binary value for each dot on the display screen 6.

In the display control device 1 having the above configuration, when the image data 7 is stored in the video RAM 3 under the control of the processor 2, the display control unit 4 reads out the image data from the video RAM 3 at a predetermined cycle and displays the display screen 6 of the CRT 5. Perform display. On the display screen 6, when the image data 7 is "1", a dot is displayed at a position corresponding to this image data.

Next, the case of color display will be explained using FIG.

FIG. 3 is a block diagram of a conventional color display control device.

As shown in the figure, video RA stores image data.
MIII to 11n are connected to color image data output means (color palette) 12. color palette 12
A bitmap display (CRT) 14 is connected to the display controller 13 via a display control section 13 .

Video RAM III to 11n has one image data n
If the video is composed of bits, the first bit is the video RA
MII, the second bit is stored in the video RAM l1. and the n-th bit is stored in the video RAM l1. , is for storing in .

The color palette 12 outputs color image data (R (red) signal, G (green) signal, B (blue) signal) corresponding to n-bit image data, and associates the image data with the color image data. It consists of a table. The display control unit 13 controls the display of the CRT 1 4 based on the color image signal output from the color palette 12, that is, transfers color image data.

The CRT14 is a display device in which each dot on the display screen 15 is displayed in color.

(Problem to be Solved by the Invention) Now, in the display control method in the conventional binary display control device explained in FIG. , a so-called blink display may be performed. In this case, it is necessary to rewrite specific image data corresponding to a specific image on the video RAM 5 alternately to "0" and "1" at a predetermined cycle. This rewriting must be directly performed by the processor 2 at predetermined intervals. Therefore, video RAM3
A problem has arisen in that the burden on the processor 2 that executes the rewriting control increases. Furthermore, since the video RAM 3 must be rewritten frequently, other processing by the processor 2 is interrupted, resulting in a decrease in processing efficiency.

Similarly, the display control method for the conventional color display control device described in FIG. 3 also has the problem of increasing the burden on the processor, etc. that performs rewriting control. Additionally, when attempting to display a specific image that changes color periodically in addition to blinking, a problem arises in that image data must be calculated to obtain the desired color image data each time the image changes color. .

The present invention has been made in view of the above points, and it is an object of the present invention to provide a display control method that can lighten the burden on a processor and easily control the display of a specific image.

(Means for Solving the Problems) A display control method of the present invention includes a bitmap display that displays dots, and a plurality of image data corresponding to a plurality of individual dots displayed on the bitmap display. A first storage device for storing a specific image displayed on the bitmap display, and a second storage device for specifying the image when displaying it blinking, and a second storage device for specifying the image from the first storage device are prepared. When data is read out and transferred to the bitmap display, the image data corresponding to the specific image is periodically masked by referring to the second storage device.

It also includes a bitmap display that displays dot-by-dot color display, a plurality of storage devices that store a plurality of image data corresponding to a plurality of individual dots displayed on the bitmap display, and a plurality of storage devices that are referenced by the image data. , a color image data output means for outputting color image data corresponding to the image data is prepared, and when a specific image displayed on the bitmap display is to be displayed in a changed color, the image is stored in any of the storage devices mentioned above. color image data output means for outputting color image data that is referenced by the image data and corresponds to the image data, and transfers the color image data that corresponds to the image data from each of the storage devices; In this case, the color image data corresponding to the specific image is converted by referring to any of the storage devices.

(Operation) In this method, first, a second storage device is prepared in which a specific image to be flashed is set, separate from a first storage device that stores image data. When reading image data from the first storage device and transferring it to the bitmap display, the second storage device is referred to, and if the contents of the second storage device indicate a blinking display, the image data should be transferred. Periodically masks the image data and stops transferring it to the bitmap display. As a result, the transfer of image data is periodically interrupted on the bitmap display, causing a blinking display.

Next, when storing color image data using a plurality of storage devices, one of these storage devices is used to set a specific image to be displayed in color. When color image data is converted using the color image data output means, the conversion is performed by referring to the storage device used for setting a specific image. This results in two cases in which the conversion result is based only on the color image data, and it is also based on the contents of the storage device used to set up a particular image, each displaying a different color on the bitmap display. can do.

(Embodiment) FIG. 1 shows a block diagram of a first embodiment according to the present invention.

The figure is a block diagram of a binary display control device, in which a video RAM selection section 32 is connected to a processor 31.

The video RAM selection unit 32 includes first and second storage devices,
That is, the screen display video RAM 33 and the blink setting video RAM 34 are connected. Screen display video RA
The M33 and the blink setting video RAM 34 are connected to the blink control section 35. A display control section 37 is connected to the blink control section 36, and a bitmap display 38 is connected to the display control section 37.

The processor 31 controls writing to each video RAM,
It performs blink control of a specific image. The video RAM selection unit 32 is a selection circuit that selects the video RAM to which the processor 31 writes. The screen display video RAM 33 stores binary image data. The blink setting video RAM 34 is used to set a specific image to be blinked. The blink control unit 35 refers to the contents of the blink setting video RAM 34 and determines whether or not to transfer the image data stored in the screen display video RAM 33 to the display control unit 36. accepts image data output from the blink control section 35 and controls display on the CRT 37. The CRT 37 is a display device that displays images dot by dot.

Here, a detailed explanation of the blink control section 35 will be given with reference to FIG.

FIG. 4 is a circuit diagram of the blink control section 35 according to the first embodiment.

As shown in the figure, the blink control section 35 includes a clock generator 41, a flip-flop 42, and gates 43 and 44.
, exclusive OR 45.

Output A of clock generator 41 is connected to one input of AND gate 43 . The other input of the AND gate 43 is connected to the output B of the flip-flop 42 . The output C of the AND gate 43 is
is connected to one input of the The other input of the AND gate 44 is connected to the output of the video RAM 34 for blink setting. The output E of the AND gate 44 is connected to one input of the exclusive OR 45.

A screen display video RAM 33 is connected to the other input of the exclusive OR 45. Note that the input of the flip-flop 42 has a blink selection signal output from the processor 31, that is, a valid (
A signal that is set to high level) is input.

Here, with reference to FIG. 5, a display control method for blinking in the display control device shown in FIG. 1 will be described.

FIG. 5 is a time chart according to the first embodiment.

First, the processor 31 causes the video RAM selection section 32 to select the video RAM 33 for screen display, executes writing of image data, and then writes the video RAM 33 for blink setting.
is selected, and the blink setting is performed in the area corresponding to the specific image. For example, when the entire blink setting video RAM 34 is normally "O", 7 content "1" is written. moreover,
The blink selection signal is set to a valid state.

In this state, the clock generator 41 operates at a predetermined period (IH
Figure 5 (A) assumes that the clock of z) is generated.
), and further assume that the output of the flip-flop 42 is set to a high level in response to the blink selection signal (FIG. 5(B)).

Therefore, the AND gate 43 outputs a pulse corresponding to the output of the clock generator 41 (FIG. 5(C)).
The contents of the video RAM 34 for blink setting are input to the other input of the AND gate 44, and this input becomes high level in the case of an area where a blink setting has been made (FIG. 5(D)). The output of AND gate 4 is AND gate 43
When the output is high level, the blink setting video R
The contents of AM34 are output, exclusive OR45
Enter. The output of the exclusive OR 45 is, when the content of the video RAM 34 for blink setting is "1",
A signal obtained by inverting the output of the AND gate 44 is output (FIG. 5(G)).

The output of this exclusive OR 45 is
6 will be entered.

A specific image is displayed in a blinking manner by the output signal of the exclusive OR 45. That is, a normal display and an inverted display (for example, a white outline display) are alternately performed.

FIG. 6 shows a modification of the blink control section 35 according to the first embodiment.

The illustrated blink control section 35 is provided with an inverter 46 and an AND gate 47 instead of the exclusive OR 45, compared to the one previously explained in FIG. As a result, as shown in FIG. 5(H), when the contents of the blink setting video RAM 34 are at pie level, the contents of the screen display video RAM 33 are completely masked.

The output signal of the AND gate 47 causes a specific image to be displayed in a blinking manner. In other words, when it is displayed normally,
The states of disappearance are alternated.

Next, a second embodiment of the present invention will be explained using FIG.

FIG. 7 is a block diagram of a second embodiment of the present invention.

The figure is a block diagram of a color display control device, which includes a processor 50, video RAM 511 to video RAM 5.
1. , a blink control section 52, a color image data output means (color palette) 53, a display control section 54,
It consists of a bitmap display (CRT) 55. Video RAM51, ~51. are connected to the color palette 53, and the video RAM 51. is connected to the color palette 53 via the blink control section 52.

The color palette 53 is connected to the display control unit 54,
The display control section 54 is connected to the CRT 55.

The video RAMs 511 to 51n, the color palette 53, the display control section 54, and the CRT 55 are the same as the conventional ones described above in FIG.

Therefore, duplicate explanations will be omitted.

The processor 50 controls the content changes of the video RAMs 511 to 51n and controls the operation of the blink control section 52. The video RAM 51 is the processor 50
It is used in two ways: when it is used for storing image data, and when it is used for specifying an image to be displayed in a blinking manner (color-changing display).

The blink control unit 52 controls the video RAM 51. This is a gate circuit that outputs the contents of the image to the color palette 53 as appropriate.

FIG. 8 shows a circuit diagram of the blink control section 52 according to the second embodiment.

As shown in the figure, the blink control section 52 includes a clock generator 60, AND gates 61 and 65, and a flip-flop 6.
It is composed of 2.64 OR gates 63.

The output of the clock generator 60 is connected to one input of an AND gate 61, and the other input of the AND gate 61 is connected to the output of a flip-flop 62. and gate 61
The output of is connected to one input of an OR gate 63, and the output of a flip-flop 64 is connected to the other input of the OR gate 63. The output of or gate 63 is AND gate 6
The output of the video RAM 51r is connected to the other input of the AND gate 65. The output of the AND gate 65 is input to the color palette 53. A blink selection signal output from the processor 50 is input to the input of the flip-flop 62. This blink selection signal is a signal for selecting whether or not to perform blinking, and indicates that a blinking display will be performed when it is in a valid state, that is, when it is at a high level. A blink switching signal output from the processor 50 is input to the input of the flip-flop 64 . This blink switching signal is a signal indicating whether or not the video RAM 5111 is being used to set a specific image to be displayed in a blinking manner.
When it is in a valid state, that is, when it is at a low level, it indicates that it is used to set a specific image.

Here, with reference to FIG. 9, a display control method for blinking in the display control device shown in FIG. 7 will be described.

FIG. 9 is a time chart according to the second embodiment.

First, the processor 50 has a video RAM 51.

The image data is written to the video RAM 51. The blink setting, for example, content "1°" is written in the area corresponding to the specific image of .Furthermore, the blink switching signal and the blink selection signal are set to the valid state.

In this state, the clock generator 60 operates at a predetermined period (IH
Figure 9 (A)
), and further assume that the output of the flip-flop 62 is set to a high level in response to the blink selection signal (FIG. 9(B)).

Therefore, the AND gate 61 outputs a pulse corresponding to the output of the clock generator 60 (FIG. 9(C)).

It is also assumed that the output of the flip-flop 64 is set to a low level in response to the blink switching signal (FIG. 9(D)). The output of the OR gate 63 has a waveform corresponding to the output of the AND gate 61 when the output of the flip-flop 64 is at a low level (FIG. 9(E)).
). On the other hand, the video RAM 51. The information of each bit is outputted at a predetermined period (FIG. 9(F)). The AND gate 65 outputs the input from the video RAM 51n only when the output of the OR gate 63 is at a high level. Therefore, two types of image data, n bits and (n-1) bits, are input to the color palette 53 according to the cycle of the clock generator 60, and the image displayed on the CRT 55 is periodically It will change color.

As described above, by periodically changing the number of bits of image data, it is possible to perform blinking display, that is, color-changing display of a specific image.

Note that if you want to change the color during blink display, by changing the contents of the color image data output means 53,
Any color can be set (effects of the invention) According to the display control method described above, the processor periodically changes the mask and image data only for a specific image that is desired to be displayed in a blinking manner. There is no need to perform complicated processing related to this. Furthermore, when displaying in color, the color at the time of blinking display can be easily changed (changed color display) by changing the content of the color image data output means without changing the content of the image data.

[Brief Description of the Drawings] Fig. 1 is a block diagram of a first embodiment of the present invention, Fig. 2 is a block diagram of a conventional binary display control device, and Fig. 3 is a block diagram of a conventional color display control device. A block diagram of the display control device, FIG. 4 is a circuit diagram of a blink control unit according to the first embodiment, FIG. 5 is a time chart according to the first embodiment, and FIG. 6 is a diagram according to the first embodiment. Modifications of the blink control section, FIG. 7 is a block diagram of the second embodiment according to the present invention, FIG. 8 is a circuit diagram of the blink control section according to the second embodiment, and FIG. 9 is a second embodiment. It is a time chart concerning an example. 31... Processor, 32... Video RAM selection unit, 33... First storage device (video RAM for screen display), 34... Second storage device (video RAM for blink setting), 35 ... Blink control section, 36... Display control section, 3
7...Bit map display (CRT), 50...
...Processor, 51, ~51n...Video RAM. 52... Blink control unit, 53... Color image data output means, 54... Display control unit,

Claims (1)

[Scope of Claims] 1. A bitmap display that displays dot units; a first storage device that stores a plurality of image data corresponding to a plurality of individual dots displayed on the bitmap display; When displaying a specific image displayed on the bitmap display in blinking mode, a second storage device for specifying the image is prepared, and the image data is read from the first storage device and displayed on the bitmap display. A display control method characterized in that, when transferring, the image data corresponding to the specific image is periodically masked by referring to the second storage device. 2. A bitmap display that displays color in units of dots, a plurality of storage devices that store a plurality of image data corresponding to a plurality of individual dots displayed on the bitmap display, and a plurality of storage devices that are referenced by the image data. , a color image data output means for outputting color image data corresponding to the image data is prepared, and when displaying a specific image displayed on the bitmap display in a changed color, the image is stored in any of the storage devices mentioned above. and providing color image data output means for outputting color image data referenced by the image data and corresponding to the image data, and transferring the color image data corresponding to the image data from each of the storage devices. A display control method comprising: converting the image data corresponding to the specific image by referring to any of the storage devices.