JP2008058335A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device that allows intuitive recognition of the correlation between measured value and the time, by calculating the display position of a waveform, starting from a predetermined reference time, improves the visibility by zooming in a circular display, and facilitates grasping of the image of the display as a whole, from the zoom display. <P>SOLUTION: A display device that performs circular display of a measured waveform includes: a time deviation calculating means for obtaining the time difference between a preset reference time and a measured time; a display position calculating means for calculating, based on the time difference, the update period of display, and a measured value, the display position of the waveform with the reference time as the start point; and a waveform data producing means for producing a waveform data, based on the display position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display device that displays measurement data, and more particularly to a display device that displays a waveform in a circular manner.

Conventionally, a circular display for displaying a measurement waveform in a circular graph is used for displaying data of a plurality of measurement channels.
In the circular display in the conventional display device, the drawing start position of the measurement waveform on the screen is fixed, and the waveform data is continuously drawn while rotating the drawing sheet in one direction with respect to the drawing start position. There is a configuration in which the latest value is always displayed at the same position and the display position of old data is moved, and a configuration in which an arbitrary angle range is cut out from the drawing start position and displayed in an enlarged manner (for example, Patent Document 1).

FIG. 6 is a configuration diagram showing an example of a conventional display device.
In FIG. 6, the measurement unit 1 digitally converts an analog signal obtained by normalizing an input signal such as a voltage to generate A / D data.
The control means 61 stores A / D data in the memory 2 composed of SRAM (Static Random Access Memory) or the like. Further, an update cycle is obtained from the time of one cycle of the circular display set by the operator, and the waveform display is updated via the display controller 63 every update cycle.

The waveform data creation means 62 causes the overall display position calculation means 65 to calculate the display position of the measurement waveform with respect to the overall display for each update period, and creates the waveform data from the A / D data into a circular shape.
The entire display position calculation means 65 fixes the drawing start position of the measurement waveform and calculates the display position from the measurement elapsed time and the update cycle.
The display controller 63 displays the created waveform data on a display 64 such as a liquid crystal display. Data and the like are exchanged via the bus 13. The operator operates the apparatus from the operation panel 12.

FIG. 7 is a diagram showing a display example of a conventional display device.
FIG. 7 shows a circular display of measurement waveforms of a plurality of measurement channels. A measurement waveform for 12 hours is drawn in one round, and is divided into sectors at intervals of one hour around the central axis. . The drawing start position is fixed at the upper center position (0 o'clock position) that is directly above, and waveform data is continuously drawn clockwise from the 0 o'clock position.

JP 2002-131339 A

  In the circular display in the conventional display device, since the size of the screen is limited, only a small display can be performed as compared with the chart type circular recorder. For this reason, the visibility of details has been reduced. In order to cope with this, when an arbitrary angle range is cut out from the drawing start position and enlarged and displayed, the entire image is difficult to grasp.

  In addition, since the drawing start position is fixed, for example, the measurement waveform is always displayed from the position of 0 o'clock, and when the position of the measurement time is obtained from the actually drawn waveform, the line is divided into sectors (grids). It was necessary to estimate the measurement time based on the indicated time. Furthermore, since the time on the grid is not displayed until the measurement corresponding to the position is performed, there is a problem that it is difficult to estimate the correct time until the time on the grid is displayed.

  The present invention was made to solve the above-described problems, and by determining a reference time and obtaining a waveform display position starting from this reference time, the association with the time can be intuitively recognized, An object of the present invention is to provide a display device that improves the visibility by enlarging a circular display, and that makes it easy to grasp the image of the entire display from the enlarged display.

  The present invention is a display device configured as follows.

(1) In a display device for generating waveform data from A / D data of a measured waveform and displaying it circularly,
A time deviation calculating means for calculating a time difference between a preset reference time and a measurement time;
Display position calculation means for calculating the display position of the measurement waveform starting from the reference time based on the time difference and the display update period;
Waveform data creating means for creating waveform data based on the display position and the A / D data;
A display device comprising:

The present invention has the following effects.
According to the first aspect of the present invention, the display position is calculated from the time difference between the reference time and the measurement time and the update cycle, and the measurement waveform is circularly displayed starting from the reference time, whereby the relationship between the measurement value and the time is obtained. Can be recognized intuitively, and the measurement time can be easily read.

FIG. 1 is a block diagram showing an embodiment of the present invention.
In FIG. 1, the same components as those in the previous drawings are denoted by the same reference numerals, and the description thereof is omitted.

In FIG. 1, the control means 4 stores A / D data in a memory 2 made of SRAM or the like, and obtains a cycle for updating the waveform display from the time of one cycle of the circular display set by the operator. The waveform display is updated via the display controller 8.
The time deviation calculation means 10 calculates the time difference between the preset reference time and the measurement time of the measurement waveform to be displayed.

The display position calculation means 3 surrounded by a broken line is composed of a whole display position calculation means 31 and an enlarged display position calculation means 32.
The total display position calculation means 31 is configured to display the entire display starting from the reference time based on the time difference between the reference time calculated by the time deviation calculation means 10 and the measurement time and the update period when the entire display of the circular display is designated. Calculate the display position.
The waveform data creation means 6 creates waveform data in a circular shape from the above display position and A / D data. If the above-mentioned time difference exceeds the update cycle, the time displayed on the circular display is updated accordingly by adding the time corresponding to the update cycle.

That is, since the time for one round is determined by the update cycle, the reference time is set to a certain point on the circular display (for example, the 0 o'clock position) and the time is displayed starting from the reference time. The display position can be calculated according to how many hours later the measurement time is from the starting point.
Further, when the time difference between the measurement time and the reference time exceeds the update cycle, it is determined how many times the time difference corresponds to the display update. The update period is added to the time displayed in accordance with this. Then, it is possible to calculate where the display position is from the remaining time that is less than the update cycle.

  The created waveform data is displayed on the display 9 such as a liquid crystal display by the control means 4 via the display controller 8.

FIG. 2 is a diagram showing a display example in the present invention.
FIG. 2 is a circular display of measurement waveforms of a plurality of measurement channels. A waveform for 12 hours (update cycle 12 hours) is drawn on the entire display (one round). It is divided into sectors at intervals of 5 hours. The time difference from midnight is calculated with midnight as the reference time, the display position on the entire display is obtained from the calculated value and the update cycle, and the waveform image is continuously drawn. In the time display, 0:00 am is set at the upper center position (position at 0:00) which is directly above. Although not shown, when the measurement time is past noon, the time display “00:00:00” at the upper center position (0 o'clock position) is updated to “12:00”.

Returning to FIG. 1, the enlarged display position calculation means 32 calculates the position of the measurement waveform at the portion to be enlarged and displayed from the time difference between the measurement time and the reference time and the update period.
The waveform data creating means 6 uses a calculated value of the display position obtained by the enlarged display position calculating means 32 and the A / D data, and uses an image obtained by cutting out a predetermined range to which the portion to be enlarged is displayed from the entire display. Enlarged display waveform data to be enlarged and displayed is generated.
The enlarged display range is a divided range obtained by dividing the entire display range at a predetermined time interval.

FIG. 3 is a diagram showing a display example of an enlarged display of a quarter circumference.
FIG. 3 is an enlarged display of the upper left quarter circumference when the entire display range of FIG. 2 is equally divided into four from the 0 o'clock position, and is a quarter circumference that displays the latest waveform image. Using the above-described enlarged display position calculation means 32, the display position with respect to ¼ round is calculated.

FIG. 4 is an explanatory diagram showing an example of a screen update order in enlarged display.
FIG. 4 shows the order in which the divided display screen is switched when the whole display of FIG. 2 is divided into four.
In FIG. 4, waveforms 43a to 43d are displayed in the waveform display area 42 of the display screen 41 as the measurement is performed. In the 1/4 cycle display, when waveform drawing for 1/4 cycle is completed, the waveform drawing is continued in the order of (a), (b), (c), and (d) as indicated by the arrows.
This is because, by obtaining the display position from the time difference between the reference time and the measurement time by the time deviation calculation means 10 and the update cycle, the quarter circle portion to be drawn next can be recognized, and the quarter circle portion is displayed. This can be achieved by switching

With these configurations, for example, when the reference time is midnight and the measurement waveform update period is 12 hours, the waveform display position and the clock display can be associated with each other, and the measurement time is intuitive. Can be recognized.
In addition, if the update cycle is set to a time that can divide 24 hours without a fraction (for example, 1 hour, 4 hours, 8 hours, etc.), the time obtained by multiplying the update cycle by an integer is a predetermined display position (for example, the upper center position). ), The time display always starts from the hour and is effective in recognizing the measurement time.

Note that the hour is the exact time without fractions of minutes and seconds, such as 1 o'clock and 2 o'clock. For example, if one lap is 24 hours, it is midnight, When the display position is the upper center position (position at 0 o'clock), which is directly above, it is possible to ensure that the upper position is always at midnight.
It is possible to display the correct hour in the upper center position (0 o'clock position), and to make the time correlation intuitive when reading the measurement value from the measurement waveform. Conventionally, it has been necessary to estimate the time based on the time of the grid, but even if there is no time on the grid, the time can be easily estimated at the position of the displayed waveform.

Further, visibility can be improved by performing enlarged display. For example, even a 10.4 inch liquid crystal display can display 20.8 inches.
Furthermore, even when the enlarged display is performed, the measurement time can be easily recognized and the enlarged range can be switched in order, so that the entire image can be easily grasped even if the enlarged display is performed.
In addition, the operator may arbitrarily set the reference time. According to this, for example, by setting the start time to the reference time, the elapsed time from the start time to the measurement time can be easily recognized.
Further, the present invention that displays the hour at the 0 o'clock position and the conventional display that displays the waveform display start time at the 0 o'clock position may be switched by a screen operation menu or the like.

Returning to FIG. 1, the waveform reference means 11 switches to the reference waveform display for displaying the above-described enlarged measured waveform as a past waveform. Specifically, the waveform data creating means 6 is used to create waveform data in a range to be enlarged and displayed from the A / D data stored in the memory, and display it on the display 9 via the display controller 8. is there.
For example, when the entire display is equally divided into four, the past waveform display is displayed retroactively every 1/4 turn by the cursor operation, or the retroactive waveform display is restored. As long as there is A / D data, it can be traced back to the past. Instead of A / D data, waveform data may be stored and used to display the waveform.

FIG. 5 is an explanatory diagram showing an example of an operation for displaying past measurement waveforms in enlarged display.
In FIG. 5, (a) shows a normal enlarged display. A waveform display area 52 is provided on the display screen 51, and drawing of the waveform 53 is continued.
At this time, by pressing the cursor key “up”, the display is switched from the reference waveform display ((b) to (e)) for displaying the past waveform. In (b), a waveform display area 54 is provided on the display screen 51 to display a waveform 55. The background of the waveform 55 (waveform display area 54) is a color different from that of the display area 52 of (a) so that it can be clearly distinguished that it is not the current waveform.

  For example, in the case of displaying a past waveform in a quarter turn display, the cursor key “up” is operated to make a quarter in the order of (a), (b), (c), (d), (e). The past measurement waveform (waveform 55 to waveform 58) is displayed retroactively every cycle, and the waveform display traced back by the operation of the cursor key “down” is restored. In such a reference waveform display, as long as past data (A / D data or waveform data) is stored in the memory 2, it can be traced back to the past.

Thereby, it is possible to easily refer to the past measurement waveform without opening the screen operation menu or the like, so that the measurement waveform can be easily confirmed.
In addition, although 1/4 circumference display (4 divisions) was illustrated as an enlarged display, it is not restricted to this. Furthermore, you may make it designate the part to expand arbitrarily.
Each means described so far can be realized by, for example, a processor and a program.

It is the block diagram which showed one Example of this invention. It is the figure which showed one example of a display in this invention. It is the figure which showed one display example of the enlarged display of a 1/4 circumference part. It is explanatory drawing which showed an example of the order of the screen update in an enlarged display. It is explanatory drawing which showed an example of the operation | movement which displays the past measurement waveform by an enlarged display. It is the block diagram which showed an example of the conventional display apparatus. It is the figure which showed the example of 1 display of the conventional display apparatus.

Explanation of symbols

3 Enlargement display means 6 Display position calculation means 10 Time deviation calculation means 11 Waveform reference means

Claims (1)

In a display device that generates waveform data from A / D data of a measured waveform and displays it circularly,
A time deviation calculating means for calculating a time difference between a preset reference time and a measurement time;
Display position calculation means for calculating the display position of the measurement waveform starting from the reference time based on the time difference and the display update period;
Waveform data creating means for creating waveform data based on the display position and the A / D data;
A display device comprising:

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