JPH03105384A - Display control system - Google Patents

Abstract

PURPOSE:To prevent the generation of character burning on the screen of a CRT by inverting a display state when an initial screen or a menu panel is continued for a prescribed time. CONSTITUTION:A CPU 1 reads out the initial menu from a storage part 11 and displays the read menu on the screen of the CRT 7 as the initial screen. Then the CPU 1 sets up the prescribed time on a timer register 12 and the normal display of the initial menu is continued. After the lapse of the prescribed time, the CPU 1 reverses the current display state of the initial menu panel and displays the inverted state. Thus, reverse display and normal display are repeatedly inverted. When 'document producing' processing is selected by selective input and a display invert key 14 is depressed, the CPU 1 inverts the contents of an inverting FF 8 to set up the required display state.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to electronic equipment such as word processors and personal computers that are equipped with a CRT display as a display device, and relates to a method for controlling the display state of the equipment.

(Example) Conventional technology In general, in electronic devices such as word processors and personal computers, a menu screen for selecting multiple processes is displayed as an initial screen after the power is turned on, and an input to select one of the processes is displayed. When the selected process is completed, the screen is normally returned to the initial screen, a menu screen is displayed, and the screen waits for the next selection input.

On the other hand, in the above-mentioned electronic equipment,
As disclosed in the publication, it is equipped with an inversion circuit that inverts the display signal, and depending on the operation of the inversion switch, there is a normal display (VA image display) that displays white characters on a black background, and a white background display. A device has been proposed that can switch between reverse display (positive display) in which black characters are displayed.

(c) Problems to be solved by the invention In recent years, companies have been using office automation equipment such as word processors and personal computers more and more frequently. 1! It is increasingly being used to leave the power source turned on.

If used in this way, the initial screen and menu screen prompting selection input will continue for a long time, and since the initial screen and menu screen have fixed display contents, the CRT fluorescent film The beam will be irradiated to the same location for a long time. As a result, the fluorescent film deteriorates, resulting in so-called burnt characters.

(2) Means for Solving the Problems The present invention includes a timer that measures whether the duration of the initial screen or menu screen has reached a predetermined time, and an inversion circuit that inverts the display signal. and when the duration of the initial screen or menu screen reaches the predetermined time, the display state of the initial screen or menu screen is reversed from normal display to noverse display, or from reverse display to normal display, This solves problem E.

<*> Effect In the present invention, when the initial screen display or menu screen display continues for a predetermined period of time, the display signal is inverted, and the display state is reversed from normal display to reverse display, or from reverse display to normal display. , the entire fluorescent film of the CRT screen is irradiated with the beam almost uniformly, thereby preventing characters from being burnt.

(F) Embodiment FIG. 2 is a block diagram showing the configuration of a processor as an embodiment of the present invention, (1) is a CPU, (2)
is a program memory that stores programs, (3) is a text memory that stores created documents, (4) is a VRAM that stores display data, and (5) is a display control device that periodically reads data from the VRAM. (6) is a parallel-to-serial conversion circuit (P/S circuit) that converts parallel data read from VRAM into a display signal that is serial data; (7)
is a CRT display as a display device, (8) is an inverted clip prop (inverted FF) that controls whether the display state is normal display or reverse display, and (9) is P
A certain inverting circuit is connected to an EX-OR gate that inverts the display signal from the /S circuit (6) according to the output of the inverting FF (8), (10> is a register for temporarily storing the state of the inverting FF, (11> is an initial menu storage unit that stores the initial menu displayed as an initial screen on the CRT display (7), (12) is a timer register that includes a software timer in the cpu (1), and (13) )
(15) is a keyboard with a display inversion key (14);
is an interface I/F.

Hereinafter, this embodiment will be described in more detail with reference to the flowchart shown in FIG.

First, when the t source is turned on, the CPU (1) reads out an initial menu as shown in FIG. 3 from the initial menu storage section (l1) and displays it on the screen of the CRT display (7) as an initial screen. . Subsequently, whether the current display state is normal display or reverse display is stored by saving the contents of the inversion FF (8) to the register (10). The contents of this inversion FF (8) are “document creation” as described later.
After entering the processing routine, it can be set using the keyboard (13), and is set to "0" when the power is turned on.

Therefore, at this point, the EX-OR gate (9) is
The display signal of the /S circuit (6) is input as is to the CRT display (7), and the initial menu is normally displayed on the screen as shown in FIG. 3 (a).

Next, the CPU (1) sets a value representing a predetermined time as TIME in the timer register (12), for example, 'iooo.
Set o, and after setting, the keyboard? 13}, it is determined whether there is a selection input for selecting a menu. Here, if there is no selection input, the content TIME of the timer register (12) is decremented, and the TIME
Determine whether or not becomes 0, and if it is not r■J,
Repeat checking the selection key manually and decrementing TIME. In this state, the normal display of the initial menu shown in FIG. 3(a) continues.

Then, by repeating the decrement, TIME
becomes 0, that is, when the duration of the initial menu screen reaches a predetermined time, the CPU (1) switches the inverted FF (8
) is “0”, it is changed to “1”, and when it is “r1”, it is “1”.
0", and the initial menu screen is displayed in the reverse display state from the previous display state. In this case, the inverted FF (
8) is rewritten to "r1", and as a result, EX-OR
The gate (9) inverts and outputs the display signal of the P/S circuit (6), and the initial menu screen becomes a reverse display as shown in FIG. 3 (port).

Thereafter, each time the duration of the initial menu screen reaches a predetermined time, the reverse display and normal display are repeated.

Also, if there is a selection input while the initial menu is displayed, press C.
The PU (1) reads the information saved in the register (10) and writes it to the inverting FF (8) to return the display state to the original state, and then starts executing the selected process. After the process is complete, the screen returns to the initial screen and displays the initial menu screen. Of course, in this case, the display state is repeatedly inverted using the same process as described above. By the way, when the "Document Creation" process is selected by selection input, the display inversion key (14) on the keyboard (13>) becomes effective, and when this key is pressed, the CPU
(1) inverts the contents of the inversion FF (8) so that the user can set a desired display state. Therefore, for example, after setting the reverse display by operating the display inversion key (14), when returning to the initial menu screen and the normal display and reverse display of this initial menu screen are being repeated at predetermined intervals, , if you key in some selection input, the display state will return to reverse display when the selected process is executed. Note that the time measurement means is not limited to a software timer, and a hardware timer may also be used. (G) Effects of the Invention According to the present invention, when the initial screen or menu screen continues for a predetermined period of time, the initial screen or menu screen is displayed.
From normal display to reverse display Or, to reverse the display state from reverse display to normal display, C
Character burnout on the RT display screen can be prevented, and this is particularly effective when the power is left on for a long time.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the method of an embodiment of the present invention;
FIG. 2 is a block diagram showing the configuration of this embodiment, and FIG. 3 is a diagram showing a display example of the embodiment. (1)-CPU,
(4)-VRAM, (6)・P/S circuit, (
7)...CRT display, Ray, (8)...Inversion FF, (9)...EX-OR gate, (l2
)...Timer register, (13)...Keyhole.

Claims (2)

[Claims] (1) An electronic device equipped with a CRT display as a display means, which includes a timer that measures whether the duration of the initial screen has reached a predetermined time, and an inversion circuit that inverts the display signal. A display control method characterized in that, when the duration of the initial screen reaches the predetermined time, the display state of the initial screen is reversed from normal display to reverse display, or from reverse display to normal display. (2) In an electronic device that is equipped with a CRT display as a display means and displays a menu screen for selecting a plurality of processes on the CRT display, whether the duration of the menu screen has reached a predetermined time. and an inversion circuit that inverts a display signal, and when the duration of the menu screen reaches the predetermined time, the display state of the menu screen is changed from normal display to reverse display, or A display control method characterized by reversing from reverse display to normal display.