JPH06331390A - Data display device - Google Patents

Abstract

PURPOSE:To achieve reduction in heat development of a display device and a longer life by a method wherein data alone are written into a data holding means of the display device with a CPU to display continuously within a specified time and a display is performed in a suppressed luminance alternately or no display is made after the passage of the specified time. CONSTITUTION:A display data alone is written into a data holding means of a display device 1, with a CPU3A to display continuously within a specified time after a display is indicated for the display device 1 by a display indication means. After the passage of the specified time, a display data and a blank data are written alternately into a data holding means of the display device 1 and no display is made with the CPU3A. In such a manner. After the passage of the specified time, a display is performed in a luminance being suppressed apparently thereby enabling reduction in the heat development of the display device 1 and a holding of a longer life. The continuation of the display after the passage of the specified time eliminates the need for switching operation 2 at each specified time when data are monitored for a long time thereby getting rid of possible erroneous judgment that the display device 1 breaks down.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data display device which is suitable for application in, for example, a process control device for displaying a data type and a digital value indicating a control state.

[0002]

2. Description of the Related Art FIG. 8 shows an operation panel of a conventional data display device shown in an operation manual of, for example, Mitsubishi General Instrumentation Control System MACTUS211. In the figure, 1 is an alphanumeric display for displaying the type of data and digital value, and 2 is a push button switch as a display instructing means for switching the type of data to be displayed. Figure 9
Shows a block diagram inside the apparatus. In the figure,
3 is a CPU as a data writing means for executing a program, 4 is a ROM in which the program is stored, 5 is a RAM for storing temporarily stored data, 6 is a switch input section for capturing the state of the push button switch 2, and these The display 1 described above is connected to the bus 7.

Next, the operation will be described. The CPU 3 writes the coded display data to the data holding means (not shown) of the display 1 at predetermined intervals T according to the flowchart shown in FIG. As a result, the display 1 displays the corresponding character. The flowchart of FIG. 10 will be described. In step S1, it is determined whether 5 minutes or more have elapsed since the push button switch 2 or another switch (not shown) capable of selecting display data was operated.

If it is within 5 minutes, R is set in step S2.
The coded display data stored in the AM 5 is read and written in the data holding means of the display 1 in step S3 to display the corresponding data on the display 1. On the other hand, when 5 minutes or more has passed, blank data is prepared in step S4 and written in the data holding means of the display device 1 in step S3, and the display device 1 is not displayed (blank).
State. In addition, when the above-mentioned switch is operated in the non-display state, the data display state is restored. By the way, 5
The reason why the display unit 1 is in the non-display state when more than a minute has passed is because it is intended to reduce heat generation and prolong the service life.

[0005]

Since the conventional display device is constructed as described above, the display unit 1 will be in the non-display state 5 minutes or more after the switch operation, so that the data is monitored for a long time. Sometimes, the switch must be operated every 5 minutes, and in the non-display state, there is a problem that it is mistaken for the display 1 to be out of order.

The present invention has been made in order to solve such a problem, and when the data is monitored for a long time while maintaining the reduction of heat generation and the long life as in the conventional case, the switch is performed every predetermined time. An object of the present invention is to provide a data display device which eliminates the troublesome operation and does not make a mistake when the display device is in failure because the non-display state does not continue even after a lapse of a predetermined time.

[0007]

A data display device according to the present invention includes a display unit, a data writing unit for selectively writing display data and blank data in a data holding unit of the display unit, and a display on the display unit. And a display instructing means for instructing the display, and within a predetermined time after the display on the display is instructed by the display instructing means, only the display data is written to the data holding means of the display by the data writing means and continuously displayed. The display data and the blank data are alternately written into the data holding means of the display by the data writing means after a predetermined time has elapsed, and the display state and the non-display state are alternately set.

[0008]

In the present invention, the display state and the non-display state alternate after a lapse of a predetermined time, and the display is performed with the apparent brightness suppressed. Therefore, it is possible to reduce the heat generation of the display and maintain the life of the display as in the conventional case.
Further, since the display is continued even after the lapse of a predetermined time, when monitoring data for a long time, there is no need to operate the switch at every predetermined time, and it is not mistaken for a failure of the display.

[0009]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a data display device according to the present invention. In FIG. 1, parts corresponding to those in FIG. 9 are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, 3A is a CPU as a data writing means for executing a program, and 4A is a ROM storing a program as shown in FIG. 2, for example. CPU3A
Executes the program every predetermined period T according to the flowchart of FIG. The flowchart will be described below.

In step S11, N = N + 1 is set, and in step S12, it is determined whether 5 minutes or more have elapsed since the push button switch 2 or another switch (not shown) capable of selecting data to be displayed was operated. To do. When the switch is operated, N = 0 is set and N is reset. If it is within 5 minutes, it is determined in step S13 whether N = m (m is a positive integer). When N = m is not satisfied, the process ends.

On the other hand, when N = m, step S1
In step 4, N = 0 is set and N is reset, and in step S15, R is set.
The coded display data stored in the AM 5 is read out and written in the data holding means of the display 1 in step S16 to display the corresponding data on the display 1. As a result, before the lapse of 5 minutes from the switch operation, the data holding means of the display 1 is displayed as shown in FIG. 3A.
The display data is written for each period of × m, and the display 1 is continuously displayed as shown in FIG.

When 5 minutes or more have passed in step 12,
In step S17, it is determined whether N = n (n is a positive integer and n <m). If N = n, blank data is prepared in step S18, and step S16 is performed.
Is written in the data holding means of the display 1 to set the display 1 to the non-display (blank) state. On the other hand, when N = n is not satisfied, the process proceeds to step S13, and the same operation as in the case of within 5 minutes described above is performed.

Thus, after 5 minutes have passed since the switch operation, as shown in FIG. 3A, after the display data is written in the data holding means of the display 1, blank data is written after T × n periods. Further, after the blank data is written in the data holding means of the display device 1, T × (m−
n) period, the display data is written, and the display state during the T × n period and the non-display state during the T × (m−n) period are repeated as shown in FIG. The display is done. In this display state,
When the above switch is operated, the state before 5 minutes has elapsed and the continuous data display state is restored.

Example 2. FIG. 4 is a block diagram showing another embodiment of the data display device according to the present invention. In FIG. 4, parts corresponding to those in FIG.
Detailed description thereof will be omitted. In the figure, 3B is a CPU as data writing means for executing a program, 4B
Is, for example, an RO that stores a program as shown in FIG.
It is M. Reference numeral 8 denotes a brightness setting switch, which is connected to the switch input section 6. The switch 8 sets the brightness level of the display 1 after 5 minutes. Here, the brightness level can be set to any one of 1 to 3, and there is a relationship of brightness level 1 <brightness level 2 <brightness level 3. This example is configured as described above, and other configurations are similar to those of the example of FIG.

The CPU 3B executes the program every predetermined period T according to the flowchart of FIG. In the flowchart of FIG. 5, steps corresponding to those of the flowchart of FIG. 2 are designated by the same reference numerals. In this example, when 5 minutes or more has elapsed in step S12,
In step S19, it is determined whether or not the brightness level 1 is set by the switch 8. When the brightness level 1 is set, it is determined in step 20 whether N = i (i is a positive integer and i <m). If N = i, the process proceeds to step S18. , N = i is not satisfied, the process proceeds to step S13.

When the brightness level 1 is not set in step S19, it is determined in step S21 whether the brightness level 2 is set by the switch 8. When the brightness level 2 is set, N = N in step 22.
It is determined whether or not j (j is a positive integer and i <j <m). If N = j, the process proceeds to step S18, and N
If not j, the process proceeds to step S13. Step S2
If the brightness level 2 is not set in step 1, it is determined in step 23 whether N = k (k is a positive integer and j <k <m). If N = k, Step S18
If not N = k, the process proceeds to step S13.

As a result, after 5 minutes have passed since the switch operation, the display data is written in the data holding means of the display 1 according to the brightness level 1, 2, or 3 set by the switch 8. T × i, T × j or T
After blank data is written after the period of × k, and blank data is written in the data holding means of the display device 1, T × (m−i), T × (m−j) or T × (m−).
k) After the period, the display data is written, and T × i, T × j
Or the display state of T × k period and T × (m−i), T ×
It is repeated with the non-display state for the period (m−j) or T × (m−k). Therefore, since the time ratio between the display state and the non-display state changes according to the setting of the brightness levels 1 to 3 by the switch 8, the brightness level can be adjusted.

Example 3. FIG. 6 is a block diagram showing still another embodiment of the data display device according to the present invention.
6, parts corresponding to those in FIG. 9 are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, 3C is a CP as a data writing means for executing a program.
U and 4C are, for example, ROMs storing programs as shown in FIG. Further, 9 is a time setting switch, and this switch 9 is connected to the switch input section 6. The switch 9 sets the time To until the display brightness of the display 1 decreases. The switch 9 is provided with, for example, three switches, and by turning on each switch, the time of 5 minutes, 10 minutes, and 15 minutes can be set. This example is configured as described above, and other configurations are similar to those of the example of FIG.

The CPU 3C executes the program every predetermined period T according to the flowchart of FIG. In the flowchart of FIG. 7, steps corresponding to those in the flowchart of FIG. 2 are designated by the same reference numerals. In this example, the time To set by the switch 9 is stored in the RAM 5 when the switch is operated. And step S1
After setting N = N + 1 in 1, it is determined in step S24 whether or not To has elapsed after the switch operation. If To has not yet elapsed, the process proceeds to step S13, and if To has elapsed, the process proceeds to step S17.

As a result, after the switch operation,
Before the lapse of time, the display device 1 is continuously displayed, and after the switch operation, after the lapse of To, the display state during the period of T × n and the non-display state during the period of T × (m−n) are displayed. The brightness is apparently suppressed and displayed repeatedly.

[0021]

According to the present invention, a display unit, a data writing unit for selectively writing display data and blank data to the data holding unit of the display unit, and a display instructing unit for instructing display on the display unit. The display instructing means instructs the display to display on the display, and within a predetermined time, the data writing means writes only the display data in the data holding means of the display to continuously display the state. The data writing means alternately writes the display data and the blank data into the data holding means of the display to alternately display and blank the display.After a predetermined time, the apparent brightness is suppressed and the display is performed. Therefore, it is possible to reduce the heat generation of the display and maintain its longevity as in the conventional case. Tatte no trouble of the switch operation every predetermined time when monitoring data, the effect of such also eliminated be mistaken and indicators is faulty.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a data display device according to the present invention.

FIG. 2 is a flowchart showing an operation of the example of FIG.

FIG. 3 is a time chart for explaining the operation of the embodiment.

FIG. 4 is a block diagram showing the configuration of another embodiment of the present invention.

5 is a flowchart showing an operation of the example of FIG.

FIG. 6 is a block diagram showing the configuration of another embodiment of the present invention.

FIG. 7 is a flowchart showing an operation of the example of FIG.

FIG. 8 is a diagram showing an operation panel of a conventional data display device.

FIG. 9 is a block diagram showing a configuration of a conventional data display device.

FIG. 10 is a flowchart showing the operation of the example of FIG.

[Explanation of symbols]

 1 Alphanumeric display 2 Push button switch 3A, 3B, 3C CPU 4A, 4B, 4C ROM 5 RAM 6 Switch input section 7 Bus 8 Brightness setting switch 9 Time setting switch

Claims (1)

[Claims] 1. A display device, a data writing device for selectively writing display data and blank data to a data holding device of the display device, and a display instruction device for instructing a display on the display device. Within a predetermined time after the display on the display is instructed by the instructing means, only the display data is written to the data holding means of the display by the data writing means to continuously display the state, and after the predetermined time elapses. Is a data display device in which the display data and the blank data are alternately written into the data holding means of the display by the data writing means to alternately set the display state and the non-display state.