JPH0327088A - Display controller - Google Patents

Abstract

PURPOSE:To prolong the life of a fluorescent material by displaying all display pattern such as characters in dots when there is an input from an input device within a specific time and ANDing a pattern consisting of alternate dots and its inverted pattern when not. CONSTITUTION:A main body 21 consisting of a CPU 31 composed of a program storage type computer unit, a nonvolatile memory ROM, etc., and includes the main memory 33 consisting of a boot ROM 32 stored with a program to be executed when the power source is turned on and a RAM regarding a document creation device, etc. Then, when there is an input within a preset time interval, the display pattern for a display, etc., are all displayed in dots on a display device 23. When there is no input from the input device 22 within the specific time, on the other hand, a timer 35 operates and an interruption controller 36 can send an interruption signal to the CPU 31.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display control device such as a Japanese word processor, and particularly when the display device is a rask scan type bitmap display, the present invention relates to a display control device such as a Japanese word processor. This invention relates to a display control device that improves life characteristics by controlling the amount. [Prior Art] It is generally known that when the phosphor of a rusk scan type display is emitted for a long time, the luminance of the light emitting point tends to gradually decrease. For this reason, when using a Japanese word processor in which only the characters are emitted, if a fixed display pattern is displayed for a long time, the display pattern will appear as a trace on the phosphor, and the whole screen will be illuminated. When displaying a white pattern, problems occur such as the marks being noticeable and making it difficult to use.

In order to prevent these problems, in the case of devices where the video signal drive circuit to the display can control the brightness in an analog manner, the brightness of the entire display will be automatically adjusted when there is no input from the human-powered device for a certain period of time. Methods were used to reduce the A specific example of this type of method is used in the Hitachi Workstation 2050 and the like.

However, in devices with inexpensive monochrome displays, the drive circuit for the video signal to the display uses a display method that digitally controls only the brightness and darkness using rlJ "0". It was not possible to reduce the brightness overall.

[M problems that the invention attempts to solve]

In the above-mentioned display control device that digitally controls only the brightness and darkness, if an attempt is made to prevent the lifetime of the brightness from decreasing when there is no input from the input device for a certain period of time, in the same manner as in the case of an analog drive circuit, All display must be erased. In this case, when the operator attempts to operate the device again, he or she will not be able to confirm the contents on the screen, and there is a possibility that the operator may mistakenly assume that the power is turned off. In addition, displays are generally equipped with means for adjusting the brightness of the entire screen, and this overall brightness adjustment means allows for... A method of lowering the m degree could be considered, but there were problems such as making the mechanism complicated.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the conventional art, it is an object of the present invention to provide a means for preventing a reduction in brightness life when no input operation is performed for a certain period of time or more and a display device is left unused with electricity for a long time. .

Furthermore, even in the case of a system in which video signals are digitally controlled, it is an object of the present invention to prevent a decrease in luminance life by using a method that allows the display contents to be determined.

[Means to solve the problem]

The above purpose is to provide a means to determine that the display is in an unused state if no input is made from the input device for a certain period of time, and to control the display to thin out the contents displayed on the bitmap display at that time every other dot. This is achieved by providing a circuit.

[Effect]

The main body of the processing device, which has a display device and input device,
By having means capable of executing time measurement, if no input is made from the operator through the input device for a certain period of time or more, the entire processing device including the display device is determined to be in an unused state.

If it is determined that the processing device is not in use, the display control unit for the display device built into the processing device body reduces by half the number of dots that are bright spots in the content displayed on the display screen at that time. .

To reduce the display dots by half, for the first time, even-numbered dots for even-numbered rasks and odd-numbered dots for odd-numbered rasks are all dark dots, and for the second time, even-numbered rasters have odd-numbered dots, and odd-numbered rasks have even-numbered dots. By alternately performing the dark dot processing at a constant cycle, the display time per dot can be reduced to 1/2 of that in normal display. ``This makes it possible to double the lifetime of the phosphor relative to the standby time of the display. In addition, since the display content is displayed every other dot periodically and alternately with respect to the display dot immediately before standby, all the display dots appear to be dimly displayed over a long period of time, and the operator is Another effect is that the content displayed on the display can be fully recognized.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram showing the configuration of a document production device according to an embodiment of the present invention. The document creation device includes a main body 21 that performs processing for document creation such as kana-kanji conversion, an input device 22 that is a keyboard for inputting characters, a display device 23 that is a display section, and a document that is created. External storage device 24 for storing data on a floppy disk, etc.
and a printing device 25 that prints the created document. The operator creates the desired document while checking the content inputted from the input device 22 on the display device 23, prints it as an image document using the printing device 25 if it is to be printed, and encodes it if it is to be saved. The data is registered on the floppy disk using the external storage device 24.

Here, the display device 23 is a bitmap type CRT capable of displaying characters, symbols, etc. made up of dots.
It consists of a display, and display data is sent out from the main body 21 as a serial video signal. Normally, if the operator does not input characters or give instructions using the input device 22, the same display screen will continue to be displayed on the display device.

FIG. 3 is a block diagram showing the internal structure of the main body 2l shown in FIG. 2. Inside the main body 21, there is a CPU 31 consisting of a program storage type computer unit, a boot ROM 32 consisting of a non-volatile memory ROM and containing a program to be executed when the power is turned on, and a program for executing functions as a document creation device and documents created. A main memory 33 consisting of a random access memory (RAM) for storing data, a single power controller 34 that controls the input device 22 and sends input signals from the input device to the CPU 31
, a CRT display circuit 37 for sending video signals to the display device 23, and a CRT display circuit 37 for storing data in units of dots corresponding to the screen display contents of the display device 23.
A bitmap memory 38 consisting of M, a flexible disk control circuit (F
DC) 39, printing system ii! The printing controller 40 includes a print controller 40 that controls the printer 25, and the like. In addition, there is also a timer 35 that has a function of generating a reference time necessary to perform all these controls in an orderly manner, and an interrupt controller 36 that allows the CPU 31 to detect interrupt signals issued from each control device such as a CRT display circuit. is also incorporated into the main body.

Here, since the main body has a timer 35, if there is no input from the input device 22 for a preset time interval, the interrupt controller 3
6, it becomes possible to issue an interrupt signal. This makes it possible for the CPU 31 to regard the case where input is interrupted as a standby state, and execute necessary processing in that case.

FIG. 4 is a block diagram showing the detailed structure of the CRT display circuit section 37 and bitmap memory section 38 of the main body structure shown in FIG. The CRT controller 41 has a function of outputting a read address of the bitmap memory 38 necessary for displaying on a bitmap type display, and a function of outputting a horizontal synchronization signal and a vertical synchronization signal. CPU3 to bitmap memory 38
1 to write and read data, the address signal is connected to the bitmap memory 38 via the multiplexer 43, and the data signal is connected to the bus driver 42.
can be accessed via. The display data on the bitmap memory 38 is read regularly and continuously, and since the read data is in parallel format, it is converted to serial format by a parallel/serial conversion circuit 45, and amplified by a driver 46 as a video signal. The data is then sent to the display device 23. Here, the video signal is 2
Treated as value data, rlJ represents a bright spot on the display, and "O" represents a dark spot. The horizontal synchronization signal HSYNC and vertical synchronization signal VSYNC are also sent to the driver 4 in the same way as the video signal.
7.48 to the display. Due to the above structure. By rewriting the contents of the bitmap memory 38 by the CPU 41, it becomes possible to change the display data on the display.

FIG. 5 is a diagram showing an example of the contents of the display screen. Vertical synchronization signal VSYNC and horizontal synchronization signal HSY
In synchronization with the NC pulse, the video signal data of the elastane is sent out one by one. In the example shown, the horizontal direction is 6
It consists of 40 dots, and when the first raster data is sent out, the data is sent out sequentially in synchronization with the horizontal synchronization signal, in the order of the second raster, and then the third raster. The screen's worth of data will be displayed. In the case of the figure, the letters rHJ with 8 x 8 dots are displayed in the upper left corner.
is displayed, indicating that the black circle in the text area is a bright spot on the display.

When editing is performed by inputting characters or the like from the input device at short intervals in a normal specification state, the screen display displays all the dot patterns of the characters as shown in the figure.

For example, if there is a mode in which the rHJ character at the top left of the figure is always displayed in the same position for a long time, and if it is used in a way that is repeated every time the operation is performed, the CRT's fluorescent light will Only the bright spots of the dots deteriorate, and rHJ pattern burns appear on the screen in a short period of time.

FIG. 1 is a diagram showing an example of a display screen pattern during standby to prevent brightness deterioration of the display screen according to the present invention. The figure shows the dot pattern that changes and is displayed in the rHJ text area at the upper left of FIG. 5 when there is no input from the input device for a certain period of time or more and the device is considered to be on standby. When the CPU 31 detects an interrupt issued by the interrupt controller 36 shown in FIG. 3 when there is no input from the input device for a certain period of time, the CPU 31 displays the original pattern and the grid pattern A that were displayed before entering the standby state. Performs a logical product (AND) operation between brightness points and displays half-brightness pattern A. Further, after a certain period of time has elapsed, an AND operation is performed between the original pattern and the grid pattern B, and the half-brightness pattern B is displayed. During the standby state until the next input is made from the input device, the half-brightness pattern A and the half-brightness pattern B are periodically and alternately displayed.

When input is made again from the standby state, the display pattern on the screen is changed to the original pattern display. In the explanation, the procedure was explained for the rHJ Bunyu section, but it goes without saying that the above calculation is actually performed on the entire 640 x 400 dot screen shown in Fig. 5. By performing the above processing, the display time of the bright spot in the standby state is displayed at half the duty as in the normal state, thereby improving the life span of the display phosphor. In addition, half-brightness pattern A and half-brightness pattern B are displayed alternately at equal intervals, but if these intervals are short, the operator can recognize the pattern of the entire character as uniform. Become. FIG. 6 is a flowchart showing the flow of display control processing in the present invention. The figure illustrates a state in which half-brightness pattern A and half-brightness pattern B shown in the first drawing are displayed in sequence. In process 62, the time interval of key input from the input device is measured, and if the key input is repeated within a certain time T, in process 61, a normal screen in the state of the original pattern shown in FIG. 1 is displayed. If it is determined in step 62 that there is no key force for a certain period of time or more, half-brightness pattern A is displayed in step 63. Thereafter, if there is no key power and the display time has elapsed for a certain period of time t in process 65, the display screen is changed to half-brightness pattern B in process 66. Further, if there is no key power, the half-brightness pattern A and the half-brightness pattern B are alternately displayed at time intervals t in steps 63 and 66. Note that if there is key human power during each process, the process returns to the normal screen display mode of process 6l based on the determination in processes 64 and 67.

〔Effect of the invention〕

As described above, according to the present invention, when the input device is in a standby state where no operation is performed for a certain period of time or more, the display time duty of the brightness on the display screen is halved, thereby improving the life of the phosphor of the display. be. Furthermore, even if the method of driving the video signal to the display is a digital drive method in which it is impossible to reduce the brightness during standby to an intermediate value, the present invention can reduce the display time duty by half and further reduce the brightness in a grid pattern. By adopting a method of thinning out the display while switching between even-numbered dots and odd-numbered dots, there is also the effect that the operator can reliably recognize the displayed content during standby.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of the display screen pattern during standby in the present invention, Fig. 2 is a block diagram showing the general structure of the entire document editing device, and Fig. 3 is a diagram showing the document editing device in Fig. 2. FIG. 4 is a block diagram showing the detailed structure of the CRT display circuit section shown in FIG. 3; FIG. 5 is a block diagram showing an example of the contents of the display screen. , Figure 6 is a flowchart showing the flow of display control processing. 22...Input device, 23...Display device, 31...CPU, 35...Timer, 36...Interruption control Figure 2 Figure 1 Figure 80 turns δ f! Cicada wave 0 turn δ 1'''ISYNC Fig. 5 Fig. 6

Claims (1)

[Claims] 1. A display control device that displays information necessary for the operator on a bitmap display device according to data input from an input device, and the display device is made of a CRT and has bright spots and dark spots of 1 and 0. In a display device that is controlled by values, if there is input from the input device within a predetermined period of time, all dots of the display pattern such as characters will be displayed, and if there is no input for a certain period of time, the display will be displayed at that point. For the displayed display dot pattern, perform an AND operation with a grid pattern A of every other dot and a pattern B which is an inversion of the pattern A, and use the half-brightness pattern A and the half-brightness pattern B obtained by the calculation. A display control device characterized by periodically and alternately displaying images.