JP3046665B2 - Screen burn-in prevention method for CRT display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing burn-in of a screen of a CRT display applied as an output device such as a computer and a word processor.
The present invention relates to a CRT display screen burn-in prevention method capable of preventing the screen of a CRT display from being burned by displaying the same image on the screen of the display for a long time.

[0002]

2. Description of the Related Art Generally, various peripheral devices are connected to a computer, a word processor and the like.
CRT displays are frequently used to display input data, processed data, and the like as images such as characters and figures. If the same image is displayed on the screen of the CRT display for a long time, in other words, if the same image is displayed on the CRT display for a long time and left as it is,
Burn-in occurs in that traces of the displayed image remain on the screen of the CRT display. When another different image is displayed on the screen of the CRT display where the burn-in has occurred, the image burned on the screen of the CRT display and another different image overlap, and the visibility of the image displayed on the screen of the CRT display is increased. However, there was a problem that was reduced. Further, when a plurality of images are burned on the screen of the CRT display, there is a problem that the ability of the screen of the CRT display itself to display images is reduced in a short time.

Therefore, there has been proposed a method for preventing the burn-in of the screen of a CRT display so that the same image is not displayed on the screen of the CRT display for a long time.

[0004] Such a method for preventing burn-in of the screen of a CRT display, which prevents the same image from being displayed on the screen of a conventional CRT display for a long time, will be described. The drawing program is stored in the buffer in this dedicated area,
When the same image is displayed on the screen of the CRT display for a certain period of time or more, the drawing program is activated and the CR
The image displayed on the screen of the T display is exchanged with the image by the drawing program. In addition, an image according to the drawing program is often used as a graphic image that is moved on the screen of the CRT display to make the use frequency of the screen of the CRT display uniform.

[0005]

However, in the above-described conventional method for preventing screen burn-in of a CRT display, a drawing program is provided to prevent screen burn-in of a CRT display. The drawing routine is required, the capacity of the drawing program is increased, and a dedicated area must be provided in the main memory, and the memory efficiency of the limited main memory is reduced. Further, there is a problem that it takes a long time to create a drawing program and the cost is very high.

[0006] The present invention has been made in view of these points, and overcomes the above-mentioned problems in the conventional art.
The program for preventing the burn-in of the screen of the CRT display is simplified, and the CRT has an appropriate storage capacity without providing a dedicated area having a large storage capacity in the main memory.
An object of the present invention is to provide a method of preventing screen burn-in of a CRT display, which can reliably prevent screen burn-in of a display screen.

[0007]

According to the present invention, there is provided a method for preventing burn-in of a screen of a CRT display according to the present invention, wherein an output signal sent from a computer is displayed as an image on a CRT display screen. determined but the burn-prevention method of the screen of the CRT display to prevent the resulting burn for a long time continuously displayed by the CRT display screen, whether interrupt
If there is no interrupt for a predetermined time, empty the register,
Next, the image displayed on the screen of the CRT display is displayed.
In the area of the display image in the main memory corresponding to the image,
The buffer number is used as the buffer value.
CRT display of a buffer in the main memory
Number of the buffer corresponding to the image displayed on the screen of
After obtaining the image data of
Inverted, and then obtained this inverted image data
The buffer in the area of the display image in the original main memory
To the main memory, and then save the display image in the main memory.
The next buffer value is the number of the buffer in the
Display process in the main memory by repeating the
Displayed on the screen of the CRT display in the image area
All the image data in the buffer corresponding to the
Continue the image reversal process until it is interrupted
It is characterized a call.

[0008]

According to the method for preventing burn-in of the screen of a CRT display of the present invention having the above-described structure, if the same image is to be displayed on the screen of the CRT display for a long time, another different image is displayed on the CRT display. Until displayed on the screen, C R by a control command from the CPU
Images such as characters and graphics displayed on the screen of the T display can be switched between a light emitting state and a non-light emitting state at regular time intervals.
The frequency of use of the screen of the T display is kept uniform, and C
Burn-in of the screen of the RT display can be reliably prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an explanatory view for explaining an image inversion process of an embodiment to which a method for preventing screen burn-in of a CRT display according to the present invention is applied, and FIG. 2 is a CR according to the present invention.
It is a flowchart which shows the burn-in prevention method of the screen of T display.

An image inversion process to which the method for preventing burn-in of the screen of a CRT display according to this embodiment will be described with reference to the explanatory diagram of FIG. 1. When the same image is displayed on the screen of the CRT display 1 for a predetermined time, the CPU 2 The image inversion processing is executed in accordance with the control command from, and the image data for one screen in the main memory 3 displayed on the CRT display 1 is read into the register 5 of the CPU 2 for each buffer 4. Then, the register 5 of the CPU 2
To invert the bits (0 to 1 and 1 to 0) and return to the original buffer 4. This operation is repeated by the number of buffers 4 for one screen. Then, CR is displayed on the CRT display 1.
The inverted image is displayed via the T controller 6. This operation is repeated every desired time.

Next, a method for preventing burn-in on the screen of a CRT display according to the present embodiment will be described with reference to FIG.

First, in step ST11, each processing is executed by the application program, and the CRT
A desired image is displayed on the screen of the display 1.

Next, in step ST12, an interrupt wait, which is the first loop process of loop-1, is started, and the process proceeds to the next step ST13.

Next, in step ST13, it is determined whether or not there is an interrupt.

In step ST13, if YES (there is an interruption), the process proceeds to the next step ST19, where each process is executed by the application program and the process ends.

If NO in step ST13 (there is no interruption), the process proceeds to the next step ST14, and the first loop processing of loop-1 is continued. Then, steps ST12 to ST14, which are the first loop processing of this loop-1, are repeated for an appropriate time (about 4 minutes in the present embodiment), and if there is no interruption in step ST13, the process proceeds to the next step ST15. Then, the process proceeds to the second loop process of Loop-2.

Next, in step 15, loop-2
Waiting for an interrupt, which is the second loop processing, is started,
Proceed to the next step ST16.

Next, in step 16, an image inversion process as a subroutine (the details of this image inversion process will be described later) is executed, and the process proceeds to the next step ST17. In step ST17, it is determined whether or not there is an interrupt. .

In step ST17, if YES (there is an interruption), the process proceeds to the next step ST19, where each process is executed by the application program and the process ends.

If NO in step ST17 (no interruption), the process proceeds to the next step ST18, and the loop processing of loop-2 is continued. Then, step ST15, which is the first loop processing of this loop-2
To step ST18 are continued until an interrupt occurs in step ST17. Then, the image inversion processing in step 16 is performed at an appropriate time interval (1 in this embodiment).
(Approximately 0 second intervals).

Next, a description will be given of the image inversion processing which is the above-described subroutine.

First, in step ST21, the CPU 2
Empties register 5 of Then, the next step ST
Proceeding to 22, the image inversion processing, which is the third loop processing of Loop-3, is executed as follows.

First, in step ST22, the CR
A buffer 4 in the area of the display image in the main memory 3 corresponding to the image displayed on the screen of the T display 1
Of the buffer 4 in the main memory 3 in the register 5 of the CPU 2 and the number of the first buffer 4 corresponding to the image displayed on the CRT display 1 (step ST23). It acquires the data (image data) of the i th) and proceeds to step ST24 follows in this embodiment.

Next, in step ST24, the bits of the data obtained in step ST23 are inverted, and the process proceeds to next step ST25, where the display image in the main memory 3 from which the inverted data was obtained in step ST25 is obtained. Is returned to the buffer 4 in the area. And step ST
At 26, the number of the buffer 4 in the area of the next display image in the main memory 3 is set to the next buffer value (in this embodiment, i =
i + 1), the process proceeds to the next step ST27, and the image inversion process as the third loop process of the loop-3 is continued.

In this manner, the data in the buffer 4 corresponding to the image displayed on the CRT display 1 in the area of the display image in the main memory 3 are all inverted sequentially, and the image inversion processing of the loop 3 is executed. Is done.

As described above, the image displayed on the screen of the CRT display 1 is controlled by the control command from the CPU, ie,
Chi, inversion causes only by software (specifically, for example, to black and white is a light-emitting state of the screen of the CRT display is a non-emission state to white black reversed) that is, CR
By making the frequency of use of the screen of the T display 1 uniform, the CR
Burn-in of the screen of the T display 1 is prevented. According to the above-described method, unlike the conventional method for preventing burn-in of the screen of a CRT display, the control method is based on loop processing. Therefore, the image such as characters and graphics displayed on the screen of the CRT display 1 is inverted at regular intervals. To
The software program can be executed by creating a simple program with respect to the conventional drawing program, so that there is no trouble in creating the program and high-speed processing can be performed. Since the loop processing is applied, the operation can be performed with a small storage capacity.

The image data in the buffer 4 in the area of the display image in the main memory 3 read into the register 5 of the CPU 2 has a larger processing unit (byte rather than bit, word than byte) processing speed. Can be faster.

Further, the faster the processing system (move than move)
ovsw) Good.

It should be noted that the present invention can be similarly applied to other display devices other than a CRT display in which image sticking occurs on a display portion of an image due to the use frequency as described above.

The present invention is not limited to the above embodiment, but can be modified as required.

[0032]

As described above, according to the present invention, C
The image displayed on the RT display screen can be
By repeatedly inverting only the wear, the use frequency of the screen of the CRT display can be made uniform and the use state of the screen can be made uniform, and the burn-in of the screen of the CRT display can be prevented. CR with proper storage capacity without providing
An excellent effect that the burn-in of the screen of the T display can be reliably prevented can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an image inversion process according to an embodiment to which a method for preventing a screen burn-in of a CRT display according to the present invention is applied.

FIG. 2 is a flowchart illustrating a method for preventing burn-in of a screen of a CRT display according to the present invention.

[Explanation of symbols]

 1 CRT display 2 CPU 3 Main memory 4 Buffer 5 Register 6 CRT controller

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G09G 1/00 G09G 5/00 550 G06F 3/153

Claims (1)

(57) [Claims] 1. A CRT display screen for preventing the same image from being continuously displayed on a CRT display screen for a long time to display a burn-in on the CRT display screen. In the burn-in prevention method, the presence or absence of an interrupt is determined, and if there is no
The register is empty, then the CRT display
In the main memory corresponding to the image displayed on the screen
The buffer number in the display image area is
Then, the register in the main memory is stored in the register.
Image displayed on the screen of the CRT display
After acquiring the image data of the buffer number corresponding to
Invert the bits of this image data, and then
Table in the main memory from which the acquired image data was obtained.
Return to the buffer in the area of the display image, and then
Number of the buffer in the display image area in the
Repeat the loop process with the buffer value
CRT display in the area of the display image in the main memory
Buffer corresponding to the image displayed on the play screen
Image inversion processing to invert all image data of
Seizure prevention method of the screen of the CRT display, wherein the continued child until interrupt there.